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1
Li, Quan, and q. li@cqu edu au. "DEVELOPMENT OF HIGH FREQUENCY POWER CONVERSION TECHNOLOGIES FOR GRID INTERACTIVE PV SYSTEMS." Central Queensland University. School of Advanced Technologies & Processes, 2002. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20020807.152750.
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This thesis examines the development of DC-DC converters that are suitable for Module Integrated Converters, (MICs), in grid interactive photovoltaic (PV) systems, and especially concentrates on the study of the half bridge dual converter, which was previously developed from the conventional half bridge converter. Both hard-switched and soft-switched half bridge dual converters are constructed,
which are rated at 88W each and transform a nominal 17.6Vdc input to an output in the range from 340V to 360Vdc. An initial prototype converter operated at 100kHz and is used as a base line device to establish the operational behaviours of the converter. The second hard-switched converter operated at 250kHz and included a coaxial matrix transformer that significantly reduced the power losses related to the transformer leakage inductance. The soft-switched converter operated at 1MHz and is capable of absorbing the parasitic elements into the resonant tank. Extensive theoretical analysis, simulation and experimental results are provided for each converter. All three converters
achieved conversion efficiencies around 90%. The progressive increases in the operation frequency, while maintaining the conversion efficiency, will translate into the reduced converter size and weight. Finally different operation modes for the
soft-switched converter are established and the techniques for predicting the occurrence of those modes are developed. The analysis of the effects of the transformer winding capacitance also shows that soft switching condition applies for both the primary side mosfets and the output rectifier diodes.
2
Iuravin, Egor. "Transformer Design For Dual Active Bridge Converter." Miami University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=miami1532601248778308.
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Pfender, Mark E. "Simulating and testing a DC-DC half-bridge SLR converter." Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/34721.
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Approved for public release; distribution is unlimitedIn order to obtain maximum battery lifetime and efficient operation, rechargeable batteries require unique charging profiles with an end-state, low current trickle charge. The series loaded resonant (SLR) charging system presented in this thesis meets the needs of an efficient, sensor integrated, and galvanically isolated trickle charger. The SLR DC-DC converter was successfully modeled in Simulink, and simulation results are verified in a laboratory application. The Simulink model and hardware are tested at several operating points. Component stresses are quantified and weak points are identified.
4
Harrye, Yasen Abdullahi. "Modular dual active bridge DC-DC converter for HVDC applications." Thesis, University of Aberdeen, 2017. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=235762.
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The role of high/medium power bidirectional DC-DC converters in the next generation of multi-terminal high voltage DC transmission networks is to enable intercontinental bulk power transfer. This is encouraged by increased DC-DC converter functionalities such as DC voltage stepping/matching, DC line tapping, power flow regulation, bidirectional power flow control, and DC fault isolation. In this work, a bidirectional dual active bridge (DAB) DC-DC converter is selected to pursue such functionalities, due to its desirable features for use in high power applications. This includes galvanic isolation, fast power reversal, high power density, buck/boost operation, possibility of high stepping ratio of conversion and its inherent fault isolation capability without a need for a very fast controller. However, increased reactive power and reduced soft switching range are the main limitations of DAB for applications involving high voltage conversion ratios. Reactive power circulation increases the converter RMS current leading to an increase in conduction losses especially in high power applications. Therefore, a novel triple phase shift (TPS) control algorithm that minimises the total reactive power is proposed to enhance the performance of the DC-DC converter. The algorithm iteratively searches for TPS control variables that satisfy the desired active power flow while selecting the operating mode(s) with minimum reactive power consumption. In addition, a complete DAB converter behaviour under TPS control which has not been studied in the literature before is performed for both power flow directions. Steady state analysis is undertaken for each mode by computing exact expressions for modes power transfer and range (to characterise mode boundary) without fundamental frequency assumption. A new definition of reactive power consumption based on converter total inductance is proposed and a detailed constraint for zero voltage switching (ZVS) is also presented. Moreover, it is shown that all known DAB phase shift modulation techniques including conventional, dual and extended phase shift, represent special cases of TPS, therefore the presented analysis provides a generalised theory for all phase shift based modulation techniques. To scale the converter to higher power level, a modular DAB converter is implemented with a development of power sharing controllers that utilise TPS modulation scheme. The focus is to ensure stable operation of the DAB modules in both power flow directions in the presence parametric mismatches. The reactive power minimisation algorithm and a new DC fault management mechanism are embedded within the proposed controllers. Detailed simulation and experimentation are used to validate the proposed algorithm and power sharing controllers.
5
Shih-TingTseng and 曾詩婷. "A Dual-Input Interleaved Half-Bridge Converter for Stand-Alone PV System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/11085930560526123801.
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碩士國立成功大學
電機工程學系碩博士班
101
In this thesis, a dual-input interleaved half-bridge converter for stand-alone photovoltaic (PV) system is presented. The converter is controlled with maximum power point tracking (MPPT) technology to obtain maximum output power from the PV modules. The magnetizing inductance of the transformer with center-tapped can reduce average current, thereby reducing the transformer size. This thesis focus on the energy distribution among PV modules, batteries, and the load. The PV modules supplies energy to load and charge the batteries under high irradiation condition. The batteries provide partial of the load at low irradiation condition. In cloudy day or at night, the batteries supply the total load energy. The conventional topologies of multi-input converter and the maximum power point tracking are discussed. Also, the operating principles and steady-state analysis of the proposed dual-input interleaved half-bridge converter are analyzed. Finally, an experimental prototype with 250Wpk is realized by dsPIC33FJ64GS606 digital signal processor (DSP) to verify the theoretical analysis and feasibility of the proposed system.
6
Wu, Ying-Pin, and 吳英賓. "Application of Nonisolated Single-input Dual-output Converter to Grid-connected Half-bridge Inverter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/s5a7vw.
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碩士國立交通大學
電控工程研究所
105
Nonisolated single-input dual-output converter (NSIDOC) possesses common-ground characteristics. When this converter is connected to the grid-connected half-bridge inverter. The ground of DC input source is the same as the ground of the grid voltage.Therefore, The current through the ground capacitance would be reduced. Which is important to the PV application. In this thesis, NSIDOC has been studied and implemented. Some simulations and experimental results are provided to demonstrate the idea.
7
Ke-MingChen and 陳克銘. "Design and Implementation of a Half-bridge Dual LLC Converter with Coupled-Inductor Current Doubler Rectification." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/65638343428760402123.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
100
In this thesis, a half-bridge dual LLC converter with coupled-inductor current doubler rectification is proposed. The advantages of the proposed converter are that the dual resonant tanks and current doubler rectifier can reduce the current stress of components, achieve high efficiency, increase step-down conversion ratio and high power density. The operating principle and steady-state analysis are addressed. The characteristic differences between current doubler rectifier using inductor and coupled-inductor are also presented. To verify the analysis, a laboratory prototype dual LLC resonant converter with input voltage of 400V and output 24V/21A is implemented. The maximum efficiency of proposed converter is 93.4%, and the full-load efficiency of proposed converter is 91.6%.
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Chung, Chen-lung, and 鍾鎮龍. "Study and Implementation of a Half-Bridge Series Resonant Converter with Dual Transformers and Resonant Tanks." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/03888397269878204034.
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碩士國立臺灣科技大學
電子工程系
98
This thesis introduces a traditional half-bridge series resonant converter (HB-SRC) and an LLC-type half-bridge series resonant converter (LLC HB-SRC). Then the operating principles are analyzed and the equations of equivalent models are derived. Next, the operating principles and the equivalent circuit models of the proposed half-bridge SRC with dual transformers and resonant tanks are discussed in detail. The Mathcad software is applied to simulate the influences of the quality factor (Q), K factor, characteristics impedance (Zo), and the transformer turn-ratio (Np/Ns) on the frequency response of the voltage gain. The advantages of the proposed converter is that the two transformers can share the output current to reduce the copper losses and the output diode conduction losses. By utilizing two transformers, the presented converter can achieve high efficiency and high power density. Experimental results are recorded for a prototype with an output voltage of 48 V, a rated output power of 800 W, and a resonant frequency of 74 kHz to verify the theoretical analysis. Future works for this research are also included.
9
Chung, Wang-Ting, and 鍾旺庭. "A General-Purpose Gate Driver with Automatic Dual-Sloped Control for 400V 10MHz Half-Bridge LLC Resonant Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/jknqnr.
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碩士國立交通大學
電子研究所
107
In recent years, the environmental awareness has risen, and electrical products with power-saving functions have gradually received attention. AC-DC adapters are found in most home appliance and have become one of the major improvement targets. Among the application, isolated DC-DC converters play an indispensable role. In addition to high power conversion efficiency (PCE) and high power factor (PF) at the input voltage of the mains (90VAC~ 264VAC), the use of increased operating frequency to shrink the volumes of the filters and energy storage elements is the important trend currently. In this thesis, a gate driver of a high-voltage half-bridge LLC resonant converter (LLC-RC) is designed. The input voltage of the converter is 400V, and the output voltage is 20V. The input voltage range of the gate driver is 6-12V, and the operating frequency is set to 10 MHz in order to achieve the purpose of reducing the energy storage elements. In order to suppress the gate voltage surge, the gate drive circuit uses the gate voltage slope control function. The automatic dual-sloped control (ADSC) mechanism is added to afford general-purpose function when applying to power switches of different specifications. This gate driver is implemented in TSMC 0.25 μm HV CMOS process. We only use 12V high voltage elements in order to balance the minimum circuit postpone and the wide output voltage range of the gate drive circuit when applying to the different threshold voltage power switches.
10
Yung-Chyang-Wang and 王永強. "LLC Resonant Half Bridge Converter." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/65223932741609639976.
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Cheng, Yi-Chieh, and 程怡捷. "Asymmetrical Half-Bridge Converter with Half-Wave Rectifier." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/83562527899719635722.
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碩士國立臺灣科技大學
電機工程系
102
Asymmetrical half-bridge converter (AHB) features ZVS operating under wide line and load ranges so that it is suitable for high frequency and high input voltage power conversion applications. An alternative half-wave rectifier is introduced instead and an asymmetrical half-bridge converter with half-wave rectifier (AHB-HWR) is proposed in this thesis. However, the AHB has pulsating input current waveform, that associated to the EMI problem. There are several ripple reduction converters have been proposed in the literatures. The built-in input filter is obtained by using current ripple cancellation mechanism. To employ this mechanism, therefore, an input current ripple reduction asymmetrical half-bridge converter with half-wave rectifier (RRAHB-HWR) is proposed. Furthermore, two proposed converters with same specifications 300V-400V input and 24V/10A output are analyzed implemented and tested to demonstrate their feasibilities.
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Hsu, Wun-Jheng, and 許文政. "Digital Control Application in Half-Bridge Converter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/03635304850141518286.
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碩士國立臺灣科技大學
電機工程系
100
In this thesis, a backup power converter with wide-range input voltage from 40 to 75 Vdc and output voltage 48 Vdc is required in telecommunication system application. Therefore, a step-up/step-down voltage gain and non-pulsating input current is requested. Among the available topologies, the buck-boost derived converters are suitable for this applications. However, there is a pulsating input current waveform of the Buck-Boost derived converters. The pulsating input current ripple generates di/dt noise and is not suitable for the battery based backup power system. Therefore, a larger filter is needed to meet the EMI regulation and extend the battery life. On the other hand, both derived converters have moving pole characteristic inherited from the Boost converter resulting in hard realizing the controller with PWM voltage-mode control. Therefore, the Half-Bridge Converter with Input Current Ripple Reduction (HBC-CRR) is employed to obtain the required voltage gain, reduced input current ripple, and a controller with the simple voltage mode. Although the required voltage gain and a continuous input current can be achieved, the control of this topology has not been explored yet. It becomes the research topic of this thesis. The analog control of HBC-CRR will be designed and implemented. Moreover, the obtained transfer function will be converted into the difference equation for the design of the digital control. Thus, digital control will be implemented by using TI TMS320F28027 Digital Signal Processors (DSPs). In addition to the theory, several main features and development tools for DSPs are introduced. Moreover, the experimental results of both analog and digital controllers for a Half-Bridge Converter with Current Ripple Reduction (HBC-CRR) power converter are presented and compared.
13
Li, Yung-Chiuan, and 李永全. "Study Implementation of Half-Bridge power converter." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/59093757091569966724.
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碩士國立雲林科技大學
電機工程系碩士班
91
The power electronic products results in low power quality and low efficiency. this thesis presents a current control for the single-phase two-level neutral point switch-clamped converter. The proposed neutral point switch-clamped converter can be operated as an power factor corrector, dc-ac inverter and voltage regulator. The software program matlab / simulink was used to simulate and analysis the proposed control method. The results revealed that the adopted converter has the characteristics of high power factor, and high efficiency.
14
Chiou, Feng-Jie, and 仇鳳傑. "Study and Implementation of Asymmetrical Half-Bridge Converter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/41514623530404114314.
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碩士國立高雄第一科技大學
電子工程研究所
100
Compared with conventional hard-switching mode, the soft switching technique causes smaller losses in applications of Switching Power Supply (SPS). The asymmetrical half-bridge converter with synchronous rectification and soft-switching technique uses turn-on and turn-off hours to achieve soft switching mode for reducing losses at high frequency, voltage and current stresses between two power switches. To reduce losses, multiplication of forward voltage and current, and increase efficiency of asymmetrical half-bridge converter, the super fast diodes are replaced with the synchronous rectification technique in secondary side of transformer. In this experiment, the turns ratio of transformer is designed to match duty cycles for devices with asymmetrical and complementary operation. Moreover, operating principle of circuit, analysis of steady-state and transient state, and design consideration are all discussed in this thesis.Finally, A 300 W prototype with 400Vdc input and 24Vdc output operating with PWM IC-L6591 is built and tested, and the efficiency at full load is 92.09% which verifies the feasibility of theoretical analysis.
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Quang, Trong Nha, and 廣眾雅. "Half-Bridge Converter with Input Current Ripple Reduction." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/gp8c4q.
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碩士國立臺灣科技大學
電機工程系
99
This study attempts to establish a new low input current ripple topology, namely Half-Bridge Converter with Input Current Ripple Reduction (HBC-CRR). By effectively utilizing leakage inductance of power transformer and adding a clamping capacitor, the HBC-CRR inherited the advantages of the Half-Bridge Converter (HBC) not only has low voltage stress on power devices, lossless snubbing, voltage clamping features but also remarkably reduce the input current ripple with minimum component count. Consequently, both electromagnetic interference (EMI) intensity and root mean square (RMS) value of the input current are significantly decreased. As a result, smaller input filter can be used. These characteristics make it suitable for high frequency, high efficiency, and low EMI power conversion applications. This thesis consists of operating principle, circuit analysis, design considerations, simulated results, and experimental results of the HBC-CRR with 360-440V input, 12V/20A output, and 100kHz operating frequency.
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Cho, Hsueh-Yu, and 卓學郁. "Half-bridge Series Resonant Converter with Integrated Transformer." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/fdn2x4.
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碩士國立臺灣科技大學
電子工程系
105
Series resonant converter usually uses a transformer which has primary side and secondary side. Leakage inductance and exciting inductance make sure that series resonant converter work correctly. This thesis applies integrated transformer which combined with three transformers. Proper core design can resist the magnet flux. It can also decrease the exciting inductance. Therefore, the transformer doesn’t need additional air gap. Lower exciting inductance value can make sure the converter reaching zero-voltage switching. Because the transformer has three center-tapped winding which is parallel-connected to secondary sides, the converter can share the secondary current. Consequently, the components can be chosen with smaller current stress. Synchronous rectification switches effectively reduce the conduction loss. This thesis uses integrated transformer to obtain lower exciting inductance and conduction loss. In addition, a plane transformer takes the place of winding transformer. A half-bridge series resonant converter operated at 300 kHz is implemented to perform the conversion of 380 V to 12 V with rated power of 700 W. The experimental results show that the efficiency can be up to 97.5%.
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TSAI, PEI-SAN, and 蔡佩珊. "Digital Controlled Interleaved Half-Bridge Series Resonant Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/48175742968165323071.
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碩士國立臺灣科技大學
電子工程系
103
This thesis focuses on the study and implementation of a digital controlled interleaved DC-DC converter which is composed of two paralleled half-bridge series resonant converters. The circuit specifications are 380 V input voltage/ 12 V output voltage and 54 V output current. High switching frequency and low switching losses can be achieved by the half-bridge series resonant converter circuit. The phase-shift between two gate driver signals is 90˚, thus the output current ripple can be reduced. The output capacitor size can be smaller, and the device stresses can be decreased. Finally, a 650 W prototype circuit of an interleaved half-bridge series resonant converter was implemented. The digital control was realized by using Texas Instruments DSP chip TMS320F28035. Theoretical analyses are verified with the experimental results.
18
Huang, Tao-chen, and 黃道朕. "Analysis and Design of Asymmetrical Half-Bridge Converter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/32903001425969773187.
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碩士國立臺灣海洋大學
電機工程學系
96
In traditional switching power supplies, hard switching is detrimental to high switching loss, high electromagnetic interference and high switch voltage stress. For improving above-mentioned shortcomings, the soft switching technique is used to reduce switching losses, EMI noises and the switch voltage stresses.The soft switching circuit consists of two power switches, a blocking capacitor and a resonant inductor. Zero-voltage switching also can be used in this converter. This paper proposes to analysis and design of the converter circuit. The steady state circuit is simulated by the software IsSpice to verify the analysis. The output of dc-dc converter is 120 watt. The input dc voltage is 400V.The output voltage is 24V.The simulation result verify the feasibility of the proposed method.
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Chen, Sin-Jhu, and 陳信助. "Semi-Controlled Post-Regulated Asymmetrical Half-Bridge Converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/79428071159685417711.
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碩士國立臺灣科技大學
電機工程系
97
Due to having soft-switching operation and low voltage stress on semiconductor devices, the asymmetrical half-bridge converter (AHBC) is suitable for high frequency off-line DC/DC power conversion applications. However, it possesses several limitations such as asymmetrical stress on rectifiers, existing DC-bias magnetizing current, loss of ZVS operation at light-load, and the stability issue of the feedback control. To alleviate these drawbacks, several configurations are suggested step by step. Firstly, a fixed duty cycle (near 50%) operation with leading-edge synchronous-switch post-regulator (SSPR) is suggested as an alternative control scheme. It features full-range ZVS, zero DC-bias magnetizing current, symmetrical voltage stress, low output current ripple, and better dynamic response. Next, the AHBC with semi-controlled SSPR is proposed to improve the efficiency for the 300~400V input ranges in off-line DC/DC. Thirdly, unbalanced secondary windings are applied to the proposed converter, providing a comprehensive solution for single-output applications. Moreover, for the multi-output applications requiring tight regulation performance, a multi-output AHBC with interleaved semi-controlled SSPR is also studied to achieve lower primary-side RMS current and to provide independent and precise regulation for multiple outputs. To demonstrate the feasibility of all proposed configurations, this study performs SIMPLIS simulation and hardware experiment validation. Finally, this work implements synchronous rectification to further improve the efficiency of proposed AHBC with semi-controlled SSPR.
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Liao, Min-Chun, and 廖敏淳. "Comparison of Active Clamp Forward Converter and Asymmetrical Half-Bridge Converter." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/91272782578903555024.
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碩士國立成功大學
電機工程學系碩博士班
93
This thesis mainly studies and implements two two-stage AC/DC power converters. The front-stage is a power factor correction circuit and the second-stage is a soft-switching DC/DC converter with synchronous rectifier. The DC/DC converter applies active clamp forward converter and asymmetrical half-bridge converter individually. These two circuits have similar zero-voltage-switching operating features, and the main circuit has the same number of components. A comparison between the two topologies is made in this thesis. The power consumption at no load condition can be reduced by disabling the power factor correction circuit and synchronous rectifier. In addition, the pulse skip scheme is used to reduce the losses of the converter at no load condition. Experimental results show that both these two prototypes can achieve 87% efficiency and 0.95 power factor at DC 12V/8A output condition.
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Huang, Sz-han, and 黃思翰. "Design and Implementation of Half bridge-Full bridge Bidirectional DC/DC Converter." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/39124875660773202004.
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碩士國立中正大學
電機工程所
98
This thesis presents design and implementation of an isolated bi-directional DC/DC converter with high voltage input、high conversion ratio and high output power for renewable power system applications. The topology of this circuit is half-bridge switch configuration at the high-voltage side and full-bridge switch configuration on the low-voltage side. In this circuit, the dsPIC chip realizes many functions, such as generation of PWM signals, A/D conversion and circuit protection,etc .When the voltage on the low-voltage side is below the normal range, the circuit is operated in buck mode. On the other hand, when the voltage on the low-voltage side is beyond the normal range, the circuit is operated in boost mode. If it is regulated within the normal range, the circuit is in idle mode. This thesis uses a active clamp snubber circuit to alleviate the voltage spike caused by the current difference between the filter inductor and leakage inductance of the isolation transformer. Finally,a 1 kW isolated bi-directional DC/DC converter has been implemented to verify the feasibility of this circuit.
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Leu, Yi-Hsin, and 呂宜興. "Analysis and Design of Asymmetrical Half-Bridge Forward Converter." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/14142706798327158438.
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博士國立臺灣大學
電機工程學研究所
92
For applications under 1kW, asymmetrical half-bridge forward converter has been adopted widely because of its simple structure, low voltage stress on power switch, and zero-voltage-switching (ZVS) capability. Analysis and design of the asymmetrical half-bridge forward converter are provided in this dissertation. The characteristics of the conventional asymmetrical half-bridge forward converter will be analyzed first, and then the two-transformer asymmetrical half-bridge converter will be also discussed. The operating principle, ZVS conditions of power switches and design considerations of the above converters are investigated. Finally, a new asymmetrical half-bridge converter topology is proposed. Compared with the conventional asymmetrical half-bridge forward converter, the proposed converter permits extension of the allowable duty cycle to above 50%. Additionally, the ZVS condition, current stress on power switch and overall efficiency are improved.
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Lin, Chih-Jung, and 林志融. "Implementation of Parallel Resonant Half-Bridge DC-DC Converter." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/19336853258899885985.
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碩士國立臺北科技大學
電機工程系碩士班
91
The objective of this thesis is to design and implement parallel resonant half-bridge converters to reduce the Electro-Magnetic Interference (EMI) and switching losses. The design specifications include: 155 V for input, 19 V for output, 90 W and 300 kHz for switching frequency. The load resonance is achieved by either varying the operation frequency or value of inductance of resonant tank. The resonant converters are analyzed by using the so-called “approximation analysis” method, which takes only fundamental component into consideration. Then the circuits are designed based upon the theoretical results. The designed circuits are implemented to verify the design process. Measured results demonstrate that 88% of efficiency for variable-inductor topology and 87.6% for variable-inductor plus variable-frequency topology can be achieved by the implemented converters, confirming the design and implementation.
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Chen, Wei-Cheng, and 陳威成. "Current sensorless control for modified half-bridge PFC converter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/60099960610576659240.
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碩士國立交通大學
電機學院電機與控制學程
102
This thesis presents the improvement of half-bridge power factor corrector (PFC) converter. For the main power circuit, use modified half-bridge PFC converter to replace the traditional topology. The modified structure can improve the short through problem which caused by series switching components to enhance the circuit reliability. And also, it can reduce the switching power loss which caused by the body diodes’ reverse current recovery time. Especially, the double voltage output characteristic of half bridge structure will be useful for higher voltage application. In order to simply the modified half bridge PFC control structure, the current sensorless control model would be estimated on the feasibility. First, check and compare the electrical characteristic difference of simulated result between multi-feedback control model and current sensorless control model. To estimate the electrical characteristic of current sensorless control model is good enough to be used. Finally, implement and evaluate the sample with modified half bridge PFC structure and sensorless control model.
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Chen, Chieh-Ting, and 陳玠廷. "A Quasi-Resonant Half-Bridge Converter with Synchronous Rectification." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/nah24w.
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碩士國立臺灣科技大學
電子工程系
102
This thesis studies and implements a simple, high-efficiency power supply for low-power applications. Without any additional light-load control strategies, the efficiency performances at both light and heavy loads are satisfactory. The front stage is a boost power factor corrector (PFC) operating mainly under critical conduction mode to fulfill near zero-voltage switching for the switch and zero-current switching for the output diode. Around zero crossings of the input voltage, the PFC operates under discontinuous conduction mode to reduce the switching loss. The post stage is a quasi-resonant half bridge (QRHB) converter. Since the switching frequency is fixed, the output voltage regulation is achieved by the duty cycle modulation. During the dead times, the switch parasitic capacitor and the resonant inductor form a resonant tank. The switch is turned on at a relatively low valley voltage. The switching frequency at light load remains constant, rather than goes high. These contribute to low switching losses. Moreover, the secondary synchronous rectifiers help reduce the conduction losses. A 90-W prototype circuit is implemented with universal input voltage and a rated 19.5-V/4.62-A output. The light-load (20%-load) efficiency reaches 85% and the peak efficiency can achieve 92.61%.
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Chen, Nan-Chung, and 陳南仲. "Analysis and Implementation of Half-Bridge LLC Resonant Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/m47vep.
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FANG, YU-XIANG, and 方昱翔. "Applying Half-Bridge LLC Resonant Converter to LED Driving." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/3u45vm.
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碩士國立臺北科技大學
電機工程系
107
A two-channel LED driver based on a half-bridge LLC resonant converter with a current-sharing capacitor is presented herein. For the proposed LED driver, the half-bridge LLC resonant converter is used to provide LED strings with galvanic isolation and stable current. At the same time, main switches have zero voltage switching so as to decrease switching loss. Furthenmore, the current-sharing capacitor is connected to the center-tapped point of the secondary winding so as to balance the currents in two LED strings. Above all, the proposed circuit has extensibility. In this paper, the operating principles of such an LED driver are firstly described and analyzed. After this, the simulated results based on PSIM software are provided so as to verify the feasibility of this LED driver. Eventually, a digital signal processor, named UCD3138, is used as a circuit control kernel, and the corresponding experimental results are offered to demonstrate the effectiveness of this LED driver.
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Yueh, Hsuan-Yu, and 岳軒宇. "Step-gap Transformer for LLC Half-bridge Resonant Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/494zgq.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
106
A current-controlled variable transformer’s magnetizing inductance strategy, for further improving the hold-up time on half-bridge LLC converter, is proposed. A simple control strategy is used to set the desired inductance value when the input power is cut-off, In detail, the transformer’s magnetizing inductance decrease sharply when the input power is cut-off, therefore, the converter’s hold-up time can be improved without using additional auxiliary circuit or modulation control method. The mathematic model between magnetizing inductance and step-gap of LLC transformer is proposed, the benefit effects using this control strategy are verified theoretically. In the end, two platforms of LLC resonant converter are built. The experimental results have verified the hold-up time improvement of LLC resonant converter utilizing step-gap transformer.
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Lin, Zi-Sheng, and 林子勝. "The Study of Solar Energy Half-Bridge Flyback Converter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/42448598511299391006.
Full textAbstract:
碩士國立勤益科技大學
電子工程系
102
The thesis aims at design of solar converters, and it makes use of PWM to conduct control of output voltage and electric current. In chip, it adopts HT66F40 of Holtek and TL494 to control signal. With modulation of signal, it sets required frequency and duty cycle, and it integrates dual signal with half-bridge electric circuits to improve bearing load wattage of the output terminal. Dual signal carries on control of signal by one crystal conduction with one crystal cutoff to upgrade output bearing load wattage. It integrates half-bridge electric circuits with flyback electric circuits to improve efficiency of converters, and converters of flyback electric circuits are bipolar mode with winding both sides of the coil. Input and output electric currents have properties of continuous and discontinuous conduction, and functions of effectively improving signal isolation and anti-electromagnetic interference. Back-end collocating with rising electric circuits supplies output terminal stable electric circuit output. In this research, the solar panels got electric energy after half-bridge flyback converter adjustments to lead-acid batteries charge. The advantages of converters are as following, higher power, high efficiency, small volume of electric currents, easy-processing signal, and lower costs.
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TWU, JHANG-YI, and 涂正誼. "Low Input Current Ripple Asymmetrical Half Bridge Flyback Converter." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/24607791252339196510.
Full textAbstract:
碩士國立臺灣科技大學
電機工程系
102
Asymmetrical half-bridge flyback converter (AHB-flyback) is attractive because of its simplicity of secondary side configuration, and low voltage stress. It can achieve high efficiency by using soft switching techniques, such as the zero-voltage switching (ZVS) of primary power switches and the zero-current switching (ZCS) of output rectifiers. These characteristics make it suitable for high frequency and high input voltage power conversion applications. However, this converter has pulsating input current resulting in generating high di/dt noise. To reduce the pulsating input current ripple, an Input Current Ripple Reduction Asymmetrical Half Bridge flyback converter (RR-AHB-flyback) is proposed in this thesis. In addition to inheriting the advantages of AHB-flyback converter, RR-AHB-flyback has significantly reduces input current ripple due to its built-in current ripple cancellation mechanism. Furthermore, the coupled inductor is used to achieve high power density and wide ZVS range. Operation principles and circuit design are shown in this thesis. Both of AHB-flyback and RR-AHB-flyback are experimented under 100 kHz, 300-400 V input and 24V/10A output to demonstrate its feasibility.
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Huang, Feng-Yu, and 黃豐裕. "A ZERO VOLTAGE SWITCHING HALF BRIDGE SERIES RESONANT CONVERTER." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/08347892719042572083.
Full textAbstract:
碩士大同大學
電機工程學系(所)
94
This thesis presents a soft switching half bridge LLC series resonant converter combine the PFC circuit. In resonant converter all switches working on the ZVS and the secondary diodes are working on the ZCS. This topology is very simple just only use one magnetic component to achieve the ZVS. This thesis presents a zero-voltage-switched (ZVS) of resonant half-bridge converter. Its advantages are high efficiency, low EMI, low switching loss, compact size, low voltage stress, etc. To achieves the ZVS of power switches, in front-end used PFC to provide a fixed voltage for the resonant converter. At the same time the PFC also reduces the harmonic current. An experimental prototype of 90~264Vac input, 24V/10A output, the resonant converter full load efficient reaches 95.2%.
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張翡珊. "Implementing shunt power factor correction with a half-bridge converter." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/93065365141843224341.
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Kuo, Chi-Yeh, and 郭啟業. "Analysis and Implementation of Asymmetrical PWM Controlled Half-Bridge Converter." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/18358069699620191956.
Full textAbstract:
碩士國立臺灣科技大學
自動化及控制研究所
93
Practical point of view in modeling and design considerations for a zero-voltage-switched (ZVS) asymmetrical half-bridge (ASY-HB) converter is proposed. Six dynamic conversion states for describing the converter characteristics are explored and modeled, including two power-delivery states, two resonant states, and two energy-transition states etc. Then a state-space averaging technique is used to describe the state equation. The compensation is implemented by K-factor technique. The Bode diagram of open-loop and closed-loop system are conducted to verify the system stability. The dynamic performance of the proposed converter is simulated by IsSpice. Design considerations are examined thoroughly. A design of 300W ZVS ASY-HB converter is examined and a high efficiency up to 91% at full load is achieved. All performances verified by experiment are quite well and close to the theoretical predictions.
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Yong-HongHuang and 黃永宏. "Analysis and Implementation of Half-bridge Resonant Capacitance LLC converter." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/05324576081032013613.
Full textAbstract:
碩士國立成功大學
電機工程學系碩博士班
101
In this thesis, a half-bridge resonant capacitance switching network LLC converter is analyzed and implemented. The half-bridge resonant capacitors switching network is adopted to reduce the input current ripple. The resonant capacitors and the input capacitors are integrated so that the components can be reduced. Two transformers are connected in series on the primary side and in parallel on the secondary side, thus the voltage stress and current stress is reduced. Since the voltage and current are automatically balanced between two transformers so that their power capacity is balanced. The operating principle is analyzed, the equivalent circuit of the resonant tank is analyzed, and some important parameters are designed. Finally, a LLC half-bridge resonant converter with 400V input voltage, 24V/600W output is implemented to verify the feasibility and effectiveness of the proposed LLC converter.
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Pong, Chen-Yin, and 彭成銀. "Design and Applications of Asymmetrical Half Bridge DC-DC Converter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/68582976159588570263.
Full textAbstract:
碩士清雲科技大學
電機工程研究所
96
This thesis consists of two parts. The first part presents analysis and design of an asymmetrical half bridge converter with flyback type transformer, in which the power switches can be turned on with ZVS and the output diode can be turned on and off with ZCS or low di/dt . The maximum voltage stress of power switches is not greater than the input voltage. While the ZVS is obtained from the magnetizing current, the ZCS is achieved from the resonant current. The soft switching conditions can be maintained from no load to full load range. The characteristics of the proposed converter rely on the utilization of resonant inductor and blocking capacitor as resonant devices rather than linearly charging and discharging components. The operational principle and design consideration of the proposed converter is described in this thesis. The experimental test along with computer simulation of a 90W/12V prototype converter is performed and the results are presented. The secondary part of this thesis deals with the design and implementation an asymmetrical half bridge DC-DC power converter with current doubler and synchronous rectifier for high efficiency power supply application. The operation modes, analysis and design, components selection, experimental prototype and measurements, and energy consumption analysis are performed in the thesis. In the proposed 300W/12V/25A converter, the synchronous rectifiers are driven by the transformer windings at the secondary side. Both the power switch and synchronous rectifier can be turned on with ZVS from no load to full load conditions, which results in high efficiency. The prototype test results show that the converter efficiency at full load is 88.25%, and is 92.6% at half load. The major energy consumptions focus on the conduction losses from semiconductor devices and hysteresis losses from magnetic components.
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Su, Ying-Jie, and 蘇英傑. "1 MHz LLC Half-Bridge Series Resonant DC-DC Converter." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/28nrqb.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
105
Gallium-nitride high-electron-mobility transistors (GaN HEMT) have been prosperously developed these years. Besides their stability, they are also widely used in various applications. According to the structure, it can be divided into enhancement mode (eGaN) and depletion mode (dGaN). At different switching frequencies, dGaN and eGaN HEMT has their own unique advantages. This thesis applies dGaN and eGaN HEMT transistors on LLC half- bridge series resonant converter, making use of the property of ZVS and ZCS to reduce their switching loss at higher switching frequency. Synchronous rectifier is utilized on the secondary side to minimize the conduction loss resulted from the high output current. In addition, the use of a planar transformer has replaced the usually applied winding transformer in order to minimize the volume and boost its whole power density. In the end of the thesis, we built two LLC half bridge resonant converters operated at 1 MHz to perform the conversion from 380 V to 12 V with rated power of 500 W, in order to compare the properties of dGaN and eGaN. After comparing the data with the experimental results, it showed that when applying to 1 MHz, the power efficiency of the eGaN version has advantage over the dGaN version.
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Hsiao, Ho-Pu, and 蕭賀璞. "Development of the Novel Half-Bridge Single-Stage Power Converter." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/k8v78s.
Full textAbstract:
碩士國立臺北科技大學
電力電子產業研發碩士專班
95
This thesis discusses how to transform two-stage power converter to single-stage power converter by component placement and synchronous switching technology. Moreover, the novel half-bridge single-stage power converter combines a half-bridge AC/DC PFC converter with a half-bridge DC/DC converter by these methods. In general, the main advantages of two-stage power converter are high power factor, low input current harmonics and so on. However, it has some disadvantages, including (1) the poor efficiency due to twice power process; (2) the two-stage structure needing extra controller, larger area of circuit and more switch components. According to the viewpoint of cost, this two-stage PFC converter is unsuitable to be used in low-power applications. In order to improve these disadvantages, the single-stage power converter is development. The novel half-bridge single-stage power converter proposed in this thesis has inherent gift of great power factor correction function, even the PFC inductor operates in DCM. Therefore, the original two controllers can be integrated into one single controller, and it still has great power factor correction function. First of all, the effect of the bulk capacitor due to load variation and how to solve this problem are discussed in this thesis. The operation and design of the proposed single-stage converter are then analyzed. Finally, experimental results show good conformation with the theoretical analysis.
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Lo, Chien-Yu, and 駱建宇. "Design and Implementation of Half-Bridge Single-Stage Power Converter." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/448dg3.
Full textAbstract:
碩士國立臺北科技大學
電力電子產業研發碩士專班
96
A novel current-fed half-bridge single-stage power converter is proposed in this thesis, which is a combination of one half-bridge PFC and one half-bridge dc/dc converter to reduce control structure and the number of switches. When PFC operating in discontinuous conduction mode and fixed switching frequency, there is power factor correction in nature, and the control process is simplified. Further, compared to voltage-fed single-stage power converter, the proposed current-fed converter is advantageous to eliminate the output filter inductor. First, this thesis recommends the differences between the voltage-fed converter and the current-fed converter, then the operation of the current-fed single-stage power converter is analyzed. Finally, make a circuit of 100 watts in order to prove the principle and theory accord.
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Chu, Chen-Yen, and 朱辰諺. "Three-Level Bi-Directional Half-Bridge Series-Series Resonant Converter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/q99c92.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
106
This thesis aims to develop a Three-Level Bi-Directional Half-Bridge Series-series Resonant Converter for DC micro-grid. Using dual resonant tanks, all components at the primary and secondary sides are the same. The clamped diode and capacitor with three-level circuit architecture can provide an appropriate current path to achieve zero-voltage switching on power switches. By using digital control method, both voltage across the primary side and the secondary side of the resonant tanks approach three-step square wave. In other words, the voltage stress of transformers, resonant tanks, power switches, and other components can be equalized to half of the input voltage and half of the output voltage. The dual resonant tanks designed according to the specifications of Three-Level Bi-Directional Half-Bridge Series-series Resonant Converter, that can operate in Region-1 and Region-2, ranges up to 380V input voltage, can adjust output voltage from 300V to 400V and can output at a constant 5A current. In order to verify that this architecture can reduce voltage stress, the voltage rating of the power switches is selected only 300V. This thesis also discusses about the voltage equalization capability of the three-level architectures. A digital signal processor (DSP) chip is used as the digital controller of this converter. The measured efficiency can be up to 95% under different load conditions.
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Lin, Jing-Han, and 林敬瀚. "Design and Implementation of Current-fed Asymmetrical Half-bridge Converter." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/81995770699527156612.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
103
The conventional hard-switching power converter presents serious electromagnetic interference (EMI) issue and a poor efficiency. By using the zero-voltage-switching (ZVS) asymmetrical half-bridge converter, switching losses and EMI noises can be reduced. This thesis aims to study and implement a current-fed asymmetrical half-bridge converter with simple circuit, low device stress and soft-switching features. Operating frequency and conversion efficiency can be effectively raised. The operation principles and design considerations of the studied current-fed asymmetrical half-bridge converter are analyzed and discussed in details. Simplis simulation and experimental results for a 400W prototype converter were implemented and tested for verify the feasibility.
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Jiang, Zong-Sian, and 江宗憲. "Interleaved LLC Half-Bridge Series Resonant Converter with Integrated Transformer." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/64pnfy.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
106
In order to reduce the line power dissipation and wire stress caused by high output current. This thesis connects two parallel LLC-SRC circuits with a 90° phase shift to eliminate the output current ripple for high circuit efficiency. However, the conventional interleaved LLC-SRC may cause unbalanced secondary output current and bad output current ripple cancellation due to the differences of two transformer. This thesis integrates two transformers into same core with core integrated technology. By replacing the usually applied winding transformer with planar transformer, the differences of two transformers would be reduced and balancing the secondary output current.
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Chen, Yu-Fu, and 陳裕夫. "Study and Implementation of Asymmetrical Half-Bridge Forward Resonant Converter." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/29206529313047032700.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
104
This thesis proposes an asymmetrical half-bridge forward resonant converter, which applies the so-called of a “hybrid-switching” technique on the converter to increase the range of zero-voltage-switching (ZVS), and the zero-current-switching (ZCS) on output diode. The magnetic hysteresis loop of a half-bridge converter can transverse over both the first and the third quadrants; therefore the magnetic components can be fully utilized. An asymmetrical half-bridge converter has the following advantages: simple structure, lower switch voltage rating, ZVS features and therefore suitable for low power applications. This thesis presents an asymmetrical half-bridge forward resonant converter without output inductor. The secondary-side Schottky diode is replaced by a synchronous rectification power MOSFETs to reduce the conduction loss and improve the power efficiency. The operating principle of the proposed converter has been analyzed, described and discussed in detail. The simulations using SIMPLIS are performed and used for circuit design. A wide input range 90 ~264 Vacin and an output of 19 V/65 W converter is implemented to verify the proposed converter scheme, which applies adapter.
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YE, QIU-RONG, and 葉秋榮. "Analysis and implementation of a half bridge series resonant converter." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/09671617404050122294.
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Lin, Chang-Kuei, and 林長貴. "Analysis and Design of 500W Half-Bridge LLC Resonant Converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/36137956038703693930.
Full textAbstract:
碩士東南科技大學
電機工程研究所
97
This thesis presents the design considerations of a 500W half-bridge LLC series resonant converter (LLC-SRC). Three kinds of the operation regions are described including (1) Region 1: fs >fr1, (2) Region 2: fr2
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YAN-HUANG, LIM, and 李焉煌. "Half-bridge parallel resonant converter using zero-voltage switching technique." Thesis, 1988. http://ndltd.ncl.edu.tw/handle/28309103926090910186.
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林一志. "Design and Implementation for Asymmetrical Half-Bridge Converter with Synchronous Rectifier." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/04791897919463069368.
Full textAbstract:
碩士國立臺北科技大學
機電整合研究所
90
The objective of this thesis is to implement an asymmetrical half-bridge converter with synchronous rectifier. The main switching device can be turned on under zero voltage, and thereby reducing the switching losses. A synchronous rectifier is used to replace diodes at out stage in order to reduce the conduction losses. At first, the operation principle of asymmetrical half-bridge converter with synchronous rectifier is described in this thesis. Then, design considerations for a practical 3.3 V/10 A asymmetrical half-bridge converter with synchronous rectifier is illustrated. Moreover, a conventional asymmetrical half-bridge converter for the same specifications is realized for comparisons and confirming that the presented topology can significantly improve the efficiency.
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Ke, Ci-you, and 柯祈佑. "Design and Implementation of a High Performance Asymmetrical Half-Bridge Converter." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/24573162544588114470.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
97
Conventional switching power supplies have serious electromagnetic interference (EMI) problem and poor efficiency performance due to their hard-switching operation. An asymmetrical half-bridge (AHB) converter with zero-voltage-switching (ZVS) features can reduce switching losses and noises effectively, thus raise the operating frequency and conversion efficiency. The asymmetrical half-bridge converter has many advantages such as simple structure, lower switch stresses and soft-switching features. However, the ZVS operation is difficult to achieve under light load condition for the AHB topology. This thesis aims to study a follower boost control method for pre-stage power factor corrector (PFC). Under low AC-line input and light load conditions, the conversion efficiency can be significantly raised by lower the DC bus voltage between the PFC circuit and AHB converter to reduce switching losses. A laboratory prototype of 240W adaptor was implemented and tested. The pre-stage circuit is a transition-mode (TM) power factor corrector for improving input power factor. The post-stage circuit is an asymmetrical half-bridge converter with zero–voltage switching features. The measured efficiency for AHB prototype circuit reaches 92.6% under low-line input and light load conditions. Thus, the overall efficiency of the developed 240W adapter can be up to 88%.
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CHEN, BING-CHANG, and 陳炳昌. "Modelling, control and implementation of microprocessor-based half-controlled bridge converter." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/40348825305580985750.
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Peng, Yu-Yao, and 彭譽耀. "Study and Implementation of an Interleaved Half-Bridge Series Resonant Converter." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/40854771020802372085.
Full textAbstract:
碩士國立臺灣科技大學
電子工程系
100
This thesis presents the study and implementation of an interleaved half-bridge (HB) series resonant converter (SRC), which is composed of two paralleled HB SRCs operated in Region-1. The phase-shift between two sets of gate driver signals is 90º. Thus the output current ripple is reduced, the size of the output capacitor is smaller, and the stresses of the power components are decreased. Moreover, the control circuit provides three operation modes for the presented interleaved converter at different load levels. From half load to full load, the two converters work at the same time to reduce the output current ripple and the conduction loss. From light load to half load, only one of the two converters works to reduce the switching loss and improve the efficiency. From no load to light load, this converter works under burst mode such that the primary-side cupper loss can be decreased and the output voltage may be regulated. With these three operation modes, the presented interleaved converter is able to achieve high efficiency at different load conditions. A 480-W prototype circuit of an interleaved HB SRC is implemented. From experimental results, it is observed that the conduction loss is decreased at full-load condition, the switching loss is reduced at half-load condition. At light-load and no-load conditions, the output DC voltage is well-regulated. The measured efficiency is from 90% to 95% at most in the entire load range.
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Chao, Chia-hung, and 趙佳宏. "Implementation of an Interleaved Half-Bridge Converter with High Input Voltage." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/37290269650047111749.
Full textAbstract:
碩士國立雲林科技大學
電機工程系碩士班
100
This thesis presents an interleaved half-bridge converter with high input voltage application. The features of the proposed converter are zero voltage switching (ZVS) turn-on for all active switches, ripple current reduction at output side, load current sharing for achieving higher power density. Two half-bridge converters connected in series and two split capacitors are used to limit the voltage stress of each power switch at one-half of input voltage. The output sides of two half-bridge converters are connected in parallel to share the load current and reduce the current stress of the secondary windings and the rectifier diodes. Since two half-bridge converters are operated with interleaved pulse-width modulation (PWM), the output ripple current can be partially cancelled each other. The operation principle and design consideration are discussed. Finally, the simulation and measured results are presented to confirm the effectiveness of the proposed converter.