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Статті в журналах з теми "Maximum power gain"

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Автор: Grafiati

Опубліковано: 9 листопада 2022

Оновлено: 4 березня 2023

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1

McGregor, J. M., and D. J. Roulston. "Transistor design for predictable power gain at maximum frequency." IEEE Transactions on Electron Devices 39, no. 2 (1992): 389–95. http://dx.doi.org/10.1109/16.121698.

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2

Bakos, J. S., P. N. Ignacz, and Z. Sorlei. "Role of power broadening in influencing maximum gain of far infrared gain material." IEEE Journal of Quantum Electronics 29, no. 7 (July 1993): 2220–24. http://dx.doi.org/10.1109/3.237496.

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3

Felinskyi, Georgii S., and Mykhailo Y. Dyriv. "Noise Gain Features of Fiber Raman Amplifier." Advances in OptoElectronics 2016 (July 12, 2016): 1–7. http://dx.doi.org/10.1155/2016/5843636.

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Анотація:

The formation dynamics of the optical noise in a silica single mode fiber (SMF) as function of the pump power variation in the counter pumped fiber Raman amplifier (FRA) is experimentally studied. The ratio between the power of amplified spontaneous emission and the power of incoherent optical noise is quantitatively determined by detailed analysis of experimental data in the pump powers range of 100–300 mW within the full band of Stokes frequencies, including FRA working wavelengths over the C + L transparency windows. It is found out the maximum of Raman gain coefficient for optical noise does not exceed ~60% of corresponding peak at the gain profile maximum of coherent signal. It is shown that the real FRA noise figure may be considerably less than 3 dB over a wide wavelength range (100 nm) at a pump power of several hundreds of mW.

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4

Tian, Hong Fang, Jian Bo Cao, and Zheng Xi Li. "The High-Gain Boost Converter for Maximum Power Point Tracking in Photovoltaic System." Advanced Materials Research 383-390 (November 2011): 2677–84. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.2677.

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The aim of this paper is to introduce a high-gain Boost circuit and to use the maximum power model to analyze the principles of maximum power point tracking (MPPT) in photovoltaic (PV) system .The principle is applied to the high-gain Boost circuit and control circuit, through a specific MPPT algorithm to change the duty cycle of Boost circuit realizes maximum power tracking and higher DC output voltage, the control circuit are formed by the CPLD and the AVR microcontroller, through which the control circuit to generate a varying duty cycle and 40KHz PWM pulse to control High-gain Boost circuit. Algorithm uses the incremental conductance method. Experiments show that maximum power point tracking effect is good.

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5

P, Bhavana. "Maximum Power Extraction in Low Power PV FED High Voltage Gain Boost Converter using Optimization Algorithm (PO & INC) by Limiting the Oscillations." Revista Gestão Inovação e Tecnologias 11, no. 4 (July 10, 2021): 1163–76. http://dx.doi.org/10.47059/revistageintec.v11i4.2176.

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6

Hu, Guanqu, Jinhui Cui, Fengjun Tian, Zhengxin Gao, Shixiong Yan, Sichen Liu, Xinlu Zhang, and Li Li. "Orthogonally Polarized Dual-Wavelength Gain-Switched Ho:LuLiF4 Pulse Laser." Photonics 10, no. 1 (January 6, 2023): 62. http://dx.doi.org/10.3390/photonics10010062.

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A compact, orthogonally polarized, gain-switched a-cut Ho:LuLiF4 laser with intra-cavity pumping by a self-Q-switched Tm:YAP laser is demonstrated here for the first time. The π-polarization laser at 2052 nm and σ-polarization laser at 2066 nm were experimentally observed with the maximum output power values of 299 mW and 126 mW, respectively, and the two polarization directions were always kept mutually orthogonal as the pump power increased. The ratio of the output power between the two orthogonal polarization lasers was nearly 1:1 at a pump power of 18.4 W. The minimum pulse width of the Ho:LLF laser was 326 ns, the maximum repetition rate was 24 kHz, and the maximum average energy was 28 μJ.

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7

Sahu, Pankaj, and Rajiv Dey. "Maximum power point tracking using adjustable gain based model reference adaptive control." Journal of Power Electronics 22, no. 1 (November 16, 2021): 138–50. http://dx.doi.org/10.1007/s43236-021-00336-3.

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8

G. SIVA, KUMAR, and DEVI A. LAKSHMI. "NEURO FUZZY GAIN SCHEDULER FOR MAXIMUM POWER TRACKING OF WIND DRIVEN DFIG." i-manager’s Journal on Electrical Engineering 13, no. 2 (2019): 33. http://dx.doi.org/10.26634/jee.13.2.15790.

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9

Umeda, Hiroyuki, Kenichiro Takahashi, and Yoshiaki Shiraga. "Maximum available power gain of microwave-transistor amplifier under large-signal operation." Electronics and Communications in Japan (Part II: Electronics) 71, no. 2 (1988): 40–52. http://dx.doi.org/10.1002/ecjb.4420710205.

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10

Ramiah, Harikrishnan, U. Eswaran, and J. Kanesan. "A high gain and high linearity class-AB power amplifier for WCDMA applications." Microelectronics International 31, no. 1 (December 20, 2013): 1–7. http://dx.doi.org/10.1108/mi-09-2012-0069.

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Анотація:

Purpose – The purpose of this paper is to design and realize a high gain power amplifier (PA) with low output back-off power using the InGaP/GaAs HBT process for WCDMA applications from 1.85 to 1.91 GHz. Design/methodology/approach – A three stages cascaded PA is designed which observes a high power gain. A 100 mA of quiescent current helps the PA to operate efficiently. The final stage device dimension has been selected diligently in order to deliver a high output power. The inter-stage match between the driver and main stage has been designed to provide maximum power transfer. The output matching network is constructed to deliver a high linear output power which meets the WCDMA adjacent channel leakage ratio (ACLR) requirement of −33 dBc close to the 1 dB gain compression point. Findings – With the cascaded topology, a maximum 31.3 dB of gain is achieved at 1.9 GHz. S11 of less than −18 dB is achieved across the operating frequency band. The maximum output power is indicated to be 32.7 dBm. An ACLR of −33 dBc is achieved at maximum linear output power of 31 dBm. Practical implications – The designed PA is an excellent candidate to be employed in the WCDMA transmitter chain without the aid of additional driver amplifier and linearization circuits. Originality/value – In this work, a fully integrated GaAs HBT PA has been implemented which is capable to operate linearly close to its 1 dB gain compression point.

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11

Kim, Huh, and Ko. "Improvement of MPPT Control Performance Using Fuzzy Control and VGPI in the PV System for Micro Grid." Sustainability 11, no. 21 (October 23, 2019): 5891. http://dx.doi.org/10.3390/su11215891.

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This paper proposes the method for maximum power point tracking (MPPT) of the photovoltaic (PV) system. The conventional PI controller controls the system with fixed gains. Conventional PI controllers with fixed gains cannot satisfy both transient and steady-state. Therefore, to overcome the shortcomings of conventional PI controllers, this paper presents the variable gain proportional integral (VGPI) controllers that control the gain value of PI controllers using fuzzy control. Inputs of fuzzy control used in the VGPI controller are the slope from the voltage-power characteristics of the PV module. This paper designs fuzzy control's membership functions and rule bases using the characteristics that the slope decreases in size, as it approaches the maximum power point and increases as it gets farther. In addition, the gain of the PI controller is adjusted to increase in transient-state and decrease in steady-state in order to improve the error in steady-state and the tracking speed of maximum power point of the PV system. The performance of the VGPI controller has experimented in cases where the solar radiation is constant and the solar radiation varies, to compare with the performance of the P&O method, which is traditionally used most often in MPPT, and the performance of the PI controller, which is used most commonly in the industry field. Finally, the results from the experiment are presented and the results are analyzed.

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12

Zhang, Xiao Wei, Ke Jin Jia, Yv Long Fang, Shao Bo Dun, Zhi Hong Feng, and Heng Ping Zhao. "High Performance Ka-Band InAlN/GaN/AlGaN HFET on SiC." Advanced Materials Research 662 (February 2013): 284–87. http://dx.doi.org/10.4028/www.scientific.net/amr.662.284.

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Ka-band radio-frequency(RF) performance of a InAlN/GaN/AlGaN HFET on SiC was reported. Based on a detailed delay analysis,a maximum drain current density of 1.12 A/mm was obtained. Power measurements were performed, the maximum output power density is 2.1 W/mm and a power-added efficiency (PAE) is 22.3% at 29 GHz. The current gain cut-off frequency (fT) is 60 GHz, and the power gain cut-off frequency (fMAX) is 105 GHz.

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13

Bharatiraja, C., Shri Harish, J. L. Munda, P. Sanjeevikumar, M. Sriram Kumar, and Vivek Bhati. "A PWM Strategies for Diode Assisted NPC-MLI to Obtain Maximum Voltage Gain for EV Application." International Journal of Power Electronics and Drive Systems (IJPEDS) 8, no. 2 (June 1, 2017): 767. http://dx.doi.org/10.11591/ijpeds.v8.i2.pp767-774.

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The projected diode assisted Neutral Point Diode Clamed (NPC-MLI) with the photovoltaic system produces a maximum voltage gain that is comparatively higher than those of other boost conversion techniques. This paper mainly explores vector selection approach pulse-width modulation (PWM) strategies for diode-assisted NPC-MLI to obtain a maximum voltage gain without compromising in waveform quality. To obtain a high voltage gain maximum utilization of dc-link voltage and stress on the power switches must be reduced. From the above issues in the diode assisted NPC-MLI leads to vector selection approach PWM technique to perform capacitive charging in parallel and discharging in series to obtain maximum voltage gain. The operation principle and the relationship of voltage gain versus voltage boost duty ratio and switching device voltage stress versus voltage gain are theoretically investigated in detail. Owing to better performance, diode-assisted NPC-MLI is more promising and competitive topology for wide range dc/ac power conversion in a renewable energy application. Furthermore, theoretically investigated are validated via simulation and experimental results.

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14

Jin, Yanyu, Mihai A. T. Sanduleanu, and John R. Long. "A Wideband Millimeter-Wave Power Amplifier With 20 dB Linear Power Gain and +8 dBm Maximum Saturated Output Power." IEEE Journal of Solid-State Circuits 43, no. 7 (July 2008): 1553–62. http://dx.doi.org/10.1109/jssc.2008.922385.

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15

Reddy, C. Subba Rami, Bharath Kumar Narukullapati, M. Uma Maheswara Rao, Sangu Ravindra, P. M. Venkatesh, T. Ch Anil Kumar, B. Mouli Chandra, and Afework Aemro Berhanu. "Nonisolated DC to DC Converters for High-Voltage Gain Applications Using the MPPT Approach." Mathematical Problems in Engineering 2022 (August 22, 2022): 1–12. http://dx.doi.org/10.1155/2022/9227651.

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Анотація:

It is proved and examined in this research paper that the perturb and observe (P and O) technique for isolating the photovoltaic array (PVA) from the power structure may be used to isolate the PV array from the power structure. A single specified voltage setup can remove the maximum power from a PV cell because of the nonlinear properties of the PV cell’s output. As a result, in PVA, the maximum power point tracking (MPPT) algorithm is utilized to increase the yield control range by increasing the maximum power point. In this study, the MPPT computations are carried out with the assistance of a DC-DC boost converter for usage in applications needing high voltage gain at a variety of sun-positioned irradiances and cell temperatures, as demonstrated in the literature.

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16

Fan, Li, Ran Sun, Liming Wang, Keyun Xiang, Jun Shen, and Jun Zhu. "High-power and efficient orthogonally-polarized dual-wavelength Nd:YLF laser." Laser Physics 32, no. 12 (November 2, 2022): 125001. http://dx.doi.org/10.1088/1555-6611/ac9c4e.

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Abstract We demonstrate an actively Q-switched orthogonally-polarized dual-wavelength laser at 1047.4 nm and 1053.4 nm with high average power and high efficiency. The gain competition between dual-wavelength lasers is effectively suppressed by using two Nd:YLF crystals as laser gain medium. Investigations concerning different resonator structures and pulse repetition frequency were conducted to achieve the best performance of this laser. Under the total incident pump power of 32.7 W, a maximum dual-wavelength laser output power of 13.4 W is obtained at the pulse repetition rate of 30 kHz, corresponding to an optical conversion efficiency of 41%. For 1047.4 nm and 1053.4 nm lasers, the maximum average output powers are as high as 7.6 W and 5.8 W, respectively, and they also demonstrate good output power stability and beam quality. This orthogonally-polarized dual-wavelength laser has significant practical applications in various fields, such as terahertz radiation generation, precision metrology, laser radar, and spectral analysis.

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17

Rachakh, Amine, Larbi El Abdellaoui, Jamal Zbitou, Ahmed Errkik, Abdelali Tajmouati, and Mohamed Latrach. "A Novel Configuration of A Microstrip Power Amplifier based on GaAs-FET for ISM Applications." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 5 (October 1, 2018): 3882. http://dx.doi.org/10.11591/ijece.v8i5.pp3882-3889.

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Power Amplifiers (PA) are very indispensable components in the design of numerous types of communication transmitters employed in microwave technology. The methodology is exemplified through the design of a 2.45GHz microwave power Amplifier (PA) for the industrial, scientific and medical (ISM) applications using microstrip technology. The main design target is to get a maximum power gain while simultaneously achieving a maximum output power through presenting the optimum impedance which is characteristically carried out per adding a matching circuit between the source and the input of the power amplifier and between the load and the output of the power amplifier. A "T" matching technique is used at the input and the output sides of transistor for assure in band desired that this circuit without reflections and to obtain a maximum power gain. The proposed power amplifier for microwave ISM applications is designed, simulated and optimized by employing Advanced Design System (ADS) software by Agilent. The PA shows good performances in terms of return loss, output power, power gain and stability; the circuit has an input return loss of -38dB and an output return loss of -33.5dB. The 1-dB compression point is 8.69dBm and power gain of the PA is 19.4dBm. The Rollet's Stability measure B1 and the stability factor K of the amplifier is greater than 0 and 1 respectively, which shows that the circuit is unconditionally stable. The total chip size of the PA is 73.5× 36 mm2.

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18

Capitaine, Armande, Gael Pillonnet, and Bruno Allard. "Strategies of Maximum Power Point Tracking for Sub-mW Benthic Microbial Fuel Cells." Journal of Low Power Electronics 15, no. 4 (December 1, 2019): 351–60. http://dx.doi.org/10.1166/jolpe.2019.1620.

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Benthic microbial fuel cells (MFCs) are promising alternatives to conventional batteries for powering underwater low-power sensors. Regarding performances (10's μW at 100's mV for cm 2-scale electrodes), an electrical interface is required to maximize the harvested energy and boost the voltage. Because the MFCs electrical behavior fluctuates, it is common to refer to maximum power point tracking (MPPT). Using a sub-mW flyback converter, this paper compares the benefit of different MPPT strategies: either by maximizing the energy at the converter input or at the converter output, or by fixing the MFC operating point at its nominal maximum power point. A practical flyback has been validated and experimentally tested for these MPPT options showing a gain in efficiency in certain configurations. The results allow determining a power budget for MPPT controllers that should not exceed this gain. Eventually, considering typical MFC fluctuations, avoiding any MPPT controller by fixing the converter operating parameters may offer better performances for sub-mW harvesters.

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19

Peng, Wenxiong, Xinyuan Li, Huaiqing Zhang, Zhewei Liu, and Wei Song. "A 5.8 GHz high-gain flexible receiving antenna for wireless power transmission." AIP Advances 12, no. 12 (December 1, 2022): 125220. http://dx.doi.org/10.1063/5.0133581.

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In this paper, a 5.8 GHz, high-gain flexible receiving antenna (FRA) is proposed, which can be used for wireless power transmission (WPT) systems. The FRA is designed by an iterative process and is etched on Kapton, with a coplanar waveguide (CPW) feed. In order to improve the gain of the FRA, an air-gap and a flexible reflector are loaded, and the gain is improved from 2.79 to 9.51 dBi at 5.8 GHz. To validate the stability of FRA, the fabricated prototype uses three configurations of 80, 70, and 50 mm. The impedance matching keeps well, and the gain of the FRA can sustain above 8.96 dBi. In addition, a miniaturized WPT system was built. The measured results show that the proposed FRA has a maximum harvesting efficiency (HE) of 71.3%, and it can maintain the maximum HE above 63% in bending conditions. The lightweight, high-gain, and high HE in various cases prove the huge potential of the FRA in WPT applications.

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20

Huang, Zhe Yang, Che Cheng Huang, Jung Mao Lin, and Chung Chih Hung. "High Gain and Low Noise Single Balanced Wireless Receiver Front-End Circuit Design." Applied Mechanics and Materials 284-287 (January 2013): 2647–51. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.2647.

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This paper presents a wideband wireless receiver front-end for 3.1-5.0GHz band group-1 (BG-1) WiMedia application. The front-end circuits are designed in 0.18um standard CMOS process. The experimental results show the maximum conversion power gain is 45.5dB; minimum noise figure is 2.9dB. Input return loss is lower than -9.3dB and output return loss is lower than -6.8dB. The maximum LO conversion power is 0dBm. 3dB working frequency is 1.9GHz (3.1GHz-5.0GHz) Total power consumption is 24.3mW including LNA, mixer and all buffers. Total chip area is 1.27mm2 including dummy and pads.

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21

Cao, Ning, Yuchang Ye, and Minghe Mao. "The Effect of Misdetection Probability on the Performance of Cooperative-Relaying-Based Cognitive Radio Systems." Mobile Information Systems 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/1051632.

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Анотація:

Cognitive radio (CR) is a promising solution to address the more and more congested radio spectrum. Cooperative relaying can provide a better transmission performance for the secondary user (SU), while the performance of the primary user (PU, also named licensed user) should be preferentially protected especially when there is misdetection probability. In this paper, in order to keep the PU away from outage caused by the interference from the SU under a certain signal-to-noise ratio (SNR), the maximum SNR for the SU can be derived by using the rate decaying factor (RDF). Then, based on the maximum channel gain and the maximum SNR, the outage probability is analyzed using decode-and-forward (DF) relaying and amplify-and-forward (AF) relaying schemes. Numerical results show that the outage probability decreases when the power allocation factor increases for DF strategy, while the outage probability has error floor when the power allocation factor increases for AF strategy. And the relaying scheme based on the maximum channel gain outperforms that based on the maximum SNR when the power allocation factor and detection probability are small, while the relaying scheme based on the maximum SNR outperforms that based on the maximum channel gain when the power allocation factor is large. What is more, AF relaying has better outage performance in the practical implementation.

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22

Sarkar, Tamen Thapa, and Chitralekha Mahanta. "Gain Tuned Sliding Mode Control Based Maximum Power Point Tracking for Solar PV systems." IFAC-PapersOnLine 55, no. 1 (2022): 417–22. http://dx.doi.org/10.1016/j.ifacol.2022.04.069.

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23

Dounis, Anastasios I., Panagiotis Kofinas, Constantine Alafodimos, and Dimitrios Tseles. "Adaptive fuzzy gain scheduling PID controller for maximum power point tracking of photovoltaic system." Renewable Energy 60 (December 2013): 202–14. http://dx.doi.org/10.1016/j.renene.2013.04.014.

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24

de la Rosa Romo, David, Rodrigo Loera-Palomo, Michel Rivero, and Francisco S. Sellschopp-Sánchez. "Averaged current mode control for maximum power point tracking in high-gain photovoltaic applications." Journal of Power Electronics 20, no. 6 (September 14, 2020): 1650–61. http://dx.doi.org/10.1007/s43236-020-00144-1.

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25

Günel, Tayfun. "A continuous hybrid approach to the FET modelling for the maximum transducer power gain." Microwave and Optical Technology Letters 35, no. 5 (October 25, 2002): 348–51. http://dx.doi.org/10.1002/mop.10603.

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26

Rukhlenko, Ivan D., Malin Premaratne, and Govind P. Agrawal. "Maximization of Gain in Slow-Light Silicon Raman Amplifiers." International Journal of Optics 2011 (2011): 1–7. http://dx.doi.org/10.1155/2011/581810.

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Анотація:

We theoretically study the problem of Raman gain maximization in uniform silicon photonic-crystal waveguides supporting slow optical modes. For the first time, an exact solution to this problem is obtained within the framework of the undepleted-pump approximation. Specifically, we derive analytical expressions for the maximum signal gain, optimal input pump power, and optimal length of a silicon Raman amplifier and demonstrate that the ultimate gain is achieved when the pump beam propagates at its maximum speed. If the signal’s group velocity can be reduced by a factor of 10 compared to its value in a bulk silicon, it may result in ultrahigh gains exceeding 100 dB. We also optimize the device parameters of a silicon Raman amplifier in the regime of strong pump depletion and come up with general design guidelines that can be used in practice.

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27

Weitkemper, P., K. Zielinski, K. D. Kammeyer, and R. Laur. "Optimized power allocation for iterative multiuser detection for a SC-CDMA uplink." Advances in Radio Science 5 (June 13, 2007): 273–78. http://dx.doi.org/10.5194/ars-5-273-2007.

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Анотація:

Abstract. This paper deals with optimization of the received power profile for iterative parallel and successive interference cancellation (PIC/SIC) in coded CDMA systems. For practical implementation additional constraints should be applied. This paper focuses on the maximum tolerable bit error rate. It will be shown that optimized power profile can considerably gain the overall system performance. Due to unequal required receive powers an allocation to certain users can be done with respect to their individual power constraints. This is important especially in near-far scenarios. Beside these constraints also the maximum number of iterations is implemented due to limiting the computational complexity in the receiver.

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28

Wang, Youfei. "Models and Programs of the Gain and Noise Figure of the Nd-doped Fiber Amplifier in 1.7-1.8μm Band". Journal of Physics: Conference Series 2282, № 1 (1 червня 2022): 012016. http://dx.doi.org/10.1088/1742-6596/2282/1/012016.

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Abstract This paper gives an introduction and research results on the Nd-doped fiber amplifier. We have constructed calculation models and programs of the Gain and Noise Figure with changing pump power, signal power, number of doped ions per unit volume, and fiber length using MATLAB. When the pump power or ion concentration increases, or the signal power decreases, the Gain has an increasing trend as presented in the research results. The Gain reaches a maximum when the fiber length is 1.35m. The Noise Figure decreases with increasing signal power or decreasing ion concentration. It reaches a minimum with a high pump power and a fiber length of 1.4m.

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29

Wang, Youfei. "Models and Programs of the Gain and Noise Figure of the Nd-doped Fiber Amplifier in 1.7-1.8μm Band". Journal of Physics: Conference Series 2282, № 1 (1 червня 2022): 012016. http://dx.doi.org/10.1088/1742-6596/2282/1/012016.

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Анотація:

Abstract This paper gives an introduction and research results on the Nd-doped fiber amplifier. We have constructed calculation models and programs of the Gain and Noise Figure with changing pump power, signal power, number of doped ions per unit volume, and fiber length using MATLAB. When the pump power or ion concentration increases, or the signal power decreases, the Gain has an increasing trend as presented in the research results. The Gain reaches a maximum when the fiber length is 1.35m. The Noise Figure decreases with increasing signal power or decreasing ion concentration. It reaches a minimum with a high pump power and a fiber length of 1.4m.

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30

Sun, Hongchang, Yaozhen Han, and Lvyuan Zhang. "Maximum Wind Power Tracking of Doubly Fed Wind Turbine System Based on Adaptive Gain Second-Order Sliding Mode." Journal of Control Science and Engineering 2018 (2018): 1–11. http://dx.doi.org/10.1155/2018/5342971.

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Анотація:

This paper proposes an adaptive gain second-order sliding mode control strategy to track optimal electromagnetic torque and regulate reactive power of doubly fed wind turbine system. Firstly, wind turbine aerodynamic characteristics and doubly fed induction generator (DFIG) modeling are presented. Then, electromagnetic torque error and reactive power error are chosen as sliding variables, and fixed gain super-twisting sliding mode control scheme is designed. Considering that uncertainty upper bound is unknown and is hard to be estimated in actual doubly fed wind turbine system, a gain scheduled law is proposed to compel control parameters variation according to uncertainty upper bound real-time. Adaptive gain second-order sliding mode rotor voltage control method is constructed in detail and finite time stability of doubly fed wind turbine control system is strictly proved. The superiority and robustness of the proposed control scheme are finally evaluated on a 1.5 MW DFIG wind turbine system.

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31

Rajalakshmi, Mani, Sankaralingam Chandramohan, Raju Kannadasan, Mohammed H. Alsharif, Mun-Kyeom Kim, and Jamel Nebhen. "Design and Validation of BAT Algorithm-Based Photovoltaic System Using Simplified High Gain Quasi Boost Inverter." Energies 14, no. 4 (February 19, 2021): 1086. http://dx.doi.org/10.3390/en14041086.

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Анотація:

Owing to the intermittent nature of renewable energy systems, an improved power extraction technique and modernized power modulators are to be designed to overcome power quality challenges. Attesting to this fact, this work aims to enhance the efficiency of the photovoltaic (PV) system using the BAT algorithm (BA) and enhances the overall performance of the system using modified inverter topology. Specifically, a new power electronic modulator, i.e., a simplified high gain quasi-boost inverter (SHGqBI), is implemented to eliminate the downsides of the conventional system. The proposed inverter reduces the additional components that can condense the volume of the design with reduced conduction and switching losses. The combination of BA-based PV rated 250 W and novel inverter configuration pick the global peak power with enhanced power quality. Notably, BA extracts the maximum power from the panel meritoriously with about 98.8% efficiency. This is because BA uses the global input parameters to track the maximum power of the PV panel, whereas other conventional maximum power point tracking (MPPT) techniques used limited parameters. Further, the current and voltage total harmonic distortion (THD) of the proposed inverter are recorded, which show a commendable range of 2.7% and 10.2%, respectively. In addition, the efficiency of the inverter is found to be 97%. Consequently, the overall system efficiency is calculated and found to be 97.9%, providing greater advantages over a conventional system. The system is mathematically modelled using MATLAB/Simulink and validated through an experimental setup with the laboratory prototype model.

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32

Hoi, Tran Van, and Ngo Thi Lanh. "Design of high power amplifier based on wilkinson power combiner for wireless communications." Indonesian Journal of Electrical Engineering and Computer Science 23, no. 1 (July 1, 2021): 330. http://dx.doi.org/10.11591/ijeecs.v23.i1.pp330-337.

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Thisarticlepresentsthedesign and fabrication ofa high power amplifierbased onwilkinson power combiner. A 45W basic amplifier module isdesigned usinglaterally-diffused metal-oxide semiconductor (LDMOS) fieldeffect transistor (FET) PTFA260451E transistor. Wilkinson power combineris used to combine two input powers toproduce 90W of power. Theproposed power amplifier is researched, designed and optimized usingadvanced design system(ADS) software.Experimental results show that thegain is 11.5 dB greater than at 2.45-3.0GHz frequency band and achieving maximum power gain of 13.5dB at 2.65GHz centre frequency; output power increased to 49.3dBm; Power added efficiency of 62.1% and good impedances matching: input reflection coefficient (S11)<-10dB, output reflection coefficient (S22)<-15dB. The designed amplifier can be used for4G, 5G mobile communications andS-band satellite communication.

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33

Kelleci, Burak, and Osman Palamutcuoglu. "Pre-Power Amplifier for 5.2 - 5.8 GHz Band." Facta universitatis - series: Electronics and Energetics 15, no. 1 (2002): 103–9. http://dx.doi.org/10.2298/fuee0201103k.

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Анотація:

The design of a low-voltage and broadband pre-power amplifier for 5.2 GHz-5.8 GHz band is presented. The purpose of the pre-power amplifier is to separate the external power amplifier and internal mixer to deliver the required input power to the power amplifier. The amplifier is designed in 0.35 \um. SiGe technology. Differential topology is used in order to reduce the effect of the bonding inductances. The amplifier is optimized for maximum yield. The simulation results of the amplifier show 0 dBm output power with 13 dB gain. The gain variation is less than 0.5 dB in band.

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34

Paul, Raphael, and Karl Heinz Hoffmann. "Cyclic Control Optimization Algorithm for Stirling Engines." Symmetry 13, no. 5 (May 13, 2021): 873. http://dx.doi.org/10.3390/sym13050873.

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Анотація:

The ideal Stirling cycle describes a specific way to operate an equilibrium Stirling engine. This cycle consists of two isothermal and two isochoric strokes. For non-equilibrium Stirling engines, which may feature various irreversibilities and whose dynamics is characterized by a set of coupled ordinary differential equations, a control strategy that is based on the ideal cycle will not necessarily yield the best performance—for example, it will not generally lead to maximum power. In this paper, we present a method to optimize the engine’s piston paths for different objectives; in particular, power and efficiency. Here, the focus is on an indirect iterative gradient algorithm that we use to solve the cyclic optimal control problem. The cyclic optimal control problem leads to a Hamiltonian system that features a symmetry between its state and costate subproblems. The symmetry manifests itself in the existence of mutually related attractive and repulsive limit cycles. Our algorithm exploits these limit cycles to solve the state and costate problems with periodic boundary conditions. A description of the algorithm is provided and it is explained how the control can be embedded in the system dynamics. Moreover, the optimization results obtained for an exemplary Stirling engine model are discussed. For this Stirling engine model, a comparison of the optimized piston paths against harmonic piston paths shows significant gains in both power and efficiency. At the maximum power point, the relative power gain due to the power-optimal control is ca. 28%, whereas the relative efficiency gain due to the efficiency-optimal control at the maximum efficiency point is ca. 10%.

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35

Garcia-Diaz, Maria, Dario Egloff, and Martin B. Plenio. "A note on coherence power of n-dimensional unitary operators." Quantum Information and Computation 16, no. 15&16 (November 2016): 1282–94. http://dx.doi.org/10.26421/qic16.15-16-2.

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Анотація:

The coherence power of a quantum channel, that is, its maximum ability to increase the coherence of input states, is a fundamental concept within the framework of the resource theory of coherence. In this note we discuss various possible definitions of coherence power and coherence rate and their basic properties. Then we prove that the coherence power of a unitary operator acting on a qubit, computed with respect to the l1-coherence measure, can be calculated by maximizing its coherence gain over pure incoherent states. We proceed to show that this result fails in the general case, that is, the maximal coherence gain is found when acting on a state with non-vanishing coherence in the case of the l1-coherence and dimension N > 2, the relative entropy of coherence and the geometric measure of coherence.

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36

Sreekanth, T., N. Lakshminarasamma, and Mahesh K. Mishra. "A Single-Stage Grid-Connected High Gain Buck–Boost Inverter With Maximum Power Point Tracking." IEEE Transactions on Energy Conversion 32, no. 1 (March 2017): 330–39. http://dx.doi.org/10.1109/tec.2016.2633365.

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37

Li, Zhi Yuan, та Xiang Ning Fan. "Design of a 0.7~3.8GHz Wideband Power Amplifier in 0.18-μm CMOS Process". Applied Mechanics and Materials 364 (серпень 2013): 429–33. http://dx.doi.org/10.4028/www.scientific.net/amm.364.429.

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Анотація:

The design of a 0.7~3.8GHz CMOS power amplifier (PA) for multi-band applications in TSMC 0.18-μm CMOS technology is presented. The PA proposed in this paper uses lossy matching network and low Q multistage impedance matching network to improve wideband. To achieve maximum linearity, this PA operates in the Class-A regime. The post-layout simulation results show that the power amplifier achieves 21.9dB of power gain, 22.3dBm of 1dB compression power output at 2GHz. The power adder efficiency (PAE) at gain compression point is 17.8% at 2GHz.

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38

Jeong, Hayeon, Huidong Lee, Bonghyuk Park, Seunghyun Jang, Sunwoo Kong, and Changkun Park. "Optimization Technique for High-Gain CMOS Power Amplifier for 5G Applications." Applied Sciences 11, no. 24 (December 9, 2021): 11691. http://dx.doi.org/10.3390/app112411691.

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Анотація:

In this study, a differential power amplifier (PA) with a high gain of over 30 dB by configuring a three-stage common source unit amplifier was designed. To ensure the stability of the high-gain differential PA, the analysis to apply the capacitive neutralization method to the differential common source PA was conducted. From the analysis, the required neutralized capacitance was quantitatively calculated from the estimated parasitic components of a power cell used in the PA. To verify the feasibility of the proposed optimization technique, a Ka-band PA was designed with a 65 nm RFCMOS process. The measurement results showed a gain of 30.7 dB. The saturated output power was measured as 16.1 dBm, maximum power-added efficiency (PAE) was 29.7%, and P1dB was 13.1 dBm.

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39

Wang, Xiao Lei, Liang Yang, and Pan Yan. "A New Engineering Model of Solar Array and MPPT Control." Advanced Materials Research 383-390 (November 2011): 591–97. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.591.

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Анотація:

An engineering model of solar array can reflect the real-time output voltage and current, the maximum power point voltage, the maximum power point current and the maximum power point in any light intensity and any temperature of solar arrary. A simulation model is established in Matlab/Simulink and proved the engineering model correctly and reliability. Using the method of Perturbation and Observation (P&O) and Incremental Conductance (INC) track the maximum power point of a solar array under the reference standard of these output elements, and found out the pursuit gain around the reference standard oscillation and further to validate the model's reliability.

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40

Amutha Priya, N., M. Aswin, S. J. Azis Shane, Y. Blessing Dino, and D. Dagul. "Performance Analysis of a High Gain LUO Converter-Based Hybrid PV-Wind System." Asian Journal of Electrical Sciences 10, no. 1 (May 15, 2021): 1–4. http://dx.doi.org/10.51983/ajes-2021.10.1.2794.

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This project is aimed at the implementation of a fuzzy logic algorithm based maximum power point tracking in transformer less grid connected PV system along with reactive power compensation. A single diode model is used for PV array and its simulation is performed using MATLAB. In fuzzy logic controller, voltage and current are taken as inputs and the effective value of A.C current corresponding to the maximum power point is obtained as output. Thus, in addition to supplying voltage by the inverter without transformer for compensating the reactive power not exceeding its power rating. This results in utilization of PV system at night and at periods of low irradiation. Rules relating the input and output of fuzzy logic controller are written and simulation is performed. A LUO Converter is used for maintaining DC input to the inverter at various conditions of irradiation and temperature. Gating pulses to the inverter are generated by proportional-integral controller. Hardware model of a10W solar panel is developed and results are obtained with fuzzy logic controller for different irradiation and temperature conditions. Results show the effectiveness of the proposed method in utilizing the PV system. This project is implemented using DSPIC30F2010 controller.

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41

Gunasegaran, Premmilaah, Jagadheswaran Rajendran, Selvakumar Mariappan, Yusman Mohd Yusof, Zulfiqar Ali Abdul Aziz, and Narendra Kumar. "A fully matched dual stage CMOS power amplifier with integrated passive linearizer attaining 23 db gain, 40% PAE and 28 DBM OIP3." Microelectronics International 38, no. 2 (August 9, 2021): 66–77. http://dx.doi.org/10.1108/mi-01-2021-0008.

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Анотація:

Purpose The purpose of this paper is to introduce a new linearization technique known as the passive linearizer technique which does not affect the power added efficiency (PAE) while maintaining a power gain of more than 20 dB for complementary metal oxide semiconductor (CMOS) power amplifier (PA). Design/methodology/approach The linearization mechanism is executed with an aid of a passive linearizer implemented at the gate of the main amplifier to minimize the effect of Cgs capacitance through the generation of opposite phase response at the main amplifier. The inductor-less output matching network presents an almost lossless output matching network which contributes to high gain, PAE and output power. The linearity performance is improved without the penalty of power consumption, power gain and stability. Findings With this topology, the PA delivers more than 20 dB gain for the Bluetooth Low Energy (BLE) Band from 2.4 GHz to 2.5 GHz with a supply headroom of 1.8 V. At the center frequency of 2.45 GHz, the PA exhibits a gain of 23.3 dB with corresponding peak PAE of 40.11% at a maximum output power of 14.3 dBm. At a maximum linear output power of 12.7 dBm, a PAE of 37.3% has been achieved with a peak third order intermodulation product of 28.04 dBm with a power consumption of 50.58 mW. This corresponds to ACLR of – 20 dBc, thus qualifying the PA to operate for BLE operation. Practical implications The proposed technique is able to boost up the efficiency and output power, as well as linearize the PA closer to 1 dB compression point. This reduces the trade-off between linear output power and PAE in CMOS PA design. Originality/value The proposed CMOS PA can be integrated comfortably to a BLE transmitter, allowing it to reduce the transceiver’s overall power consumption.

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42

Henao-Bravo, Elkin Edilberto, Carlos Andrés Ramos-Paja, Andrés Julián Saavedra-Montes, Daniel González-Montoya, and Julián Sierra-Pérez. "Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain." Energies 13, no. 7 (April 3, 2020): 1711. http://dx.doi.org/10.3390/en13071711.

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Анотація:

In this paper, a design method for a photovoltaic system based on a dual active bridge converter and a photovoltaic module is proposed. The method is supported by analytical results and theoretical predictions, which are confirmed with circuital simulations. The analytical development, the theoretical predictions, and the validation through circuital simulations, are the main contributions of the paper. The dual active bridge converter is selected due to its high efficiency, high input and output voltages range, and high voltage-conversion ratio, which enables the interface of low-voltage photovoltaic modules with a high-voltage dc bus, such as the input of a micro-inverter. To propose the design method, the circuital analysis of the dual active bridge converter is performed to describe the general waveforms derived from the circuit behavior. Then, the analysis of the dual active bridge converter, interacting with a photovoltaic module driven by a maximum power point tracking algorithm, is used to establish the mathematical expressions for the leakage inductor current, the photovoltaic current, and the range of operation for the phase shift. The design method also provides analytical equations for both the high-frequency transformer equivalent leakage inductor and the photovoltaic side capacitor. The design method is validated through detailed circuital simulations of the whole photovoltaic system, which confirm that the maximum power of the photovoltaic module can be extracted with a correct design of the dual active bridge converter. Also, the theoretical restrictions of the photovoltaic system, such as the photovoltaic voltage and power ripples, are fulfilled with errors lower than 2% with respect to the circuital simulations. Finally, the simulation results also demonstrate that the maximum power point for different environmental conditions is reached, optimizing the phase shift factor with a maximum power point tracking algorithm.

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43

Sharma, Vishal, Surinder Singh, and Lovkesh. "Development of frequency comb generation by spectral broadening of periodic optical pulses in semiconductor laser amplifiers." Journal of Optics 24, no. 4 (February 16, 2022): 045701. http://dx.doi.org/10.1088/2040-8986/ac4c86.

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Abstract This paper reports an approach for generating an ultra-flat and ultra-wide optical frequency comb by exploiting gain modulation, experienced by a periodic third ordered Gaussian-shaped optical pulse propagating through the semiconductor optical amplifier (SOA). The gain experienced by optical signal propagating inside SOA is independent of its polarization state and phase, makes the technique more favorable and stable to the optical frequency comb generation. This paper reports a 94-line optical frequency comb with 5 dB maximum power deviation and a 190-line optical frequency comb with 10 dB maximum power deviation.

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44

ADEAGBO, ENOCH, WALIU APENA, and KAYODE AKINGBADE. "QUADRIFILAR HELIX ANTENNA FOR WEATHER SATELLITE RECEPTION." Journal of Engineering Studies and Research 26, no. 3 (July 27, 2020): 7–18. http://dx.doi.org/10.29081/jesr.v26i3.202.

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The study designed and implemented quadrifilar helix antenna (QHA) for weather satellite signal reception. The antenna design and optimization were done by varying the element diameter, the radial lengths, the axial lengths, and element materials on adopted model. The simulated QHA has far-field radiation pattern in the upper hemisphere with maximum gain of 4.14dBi at 0o and omnidirectional coverage, half-power beamwidth of 140o, bandwidth of 6.5MHz, and VSWR of 1.13. The implemented QHA has major lobe in conformity with the simulated QHA with maximum gain of 10.75dB at 0o, and half-power beamwidth of 104o.

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45

Qiao, Zhong Liang, Bao Xue Bo, Si Yu Zhang, Xin Gao, Peng Lu, Hui Li, Yi Qu, and Guo Jun Liu. "808 nm Semiconductor Lasers with Tailored Gain for Mode Shape." Applied Mechanics and Materials 84-85 (August 2011): 603–6. http://dx.doi.org/10.4028/www.scientific.net/amm.84-85.603.

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We implement the concept of the distributed electrode, which allows to improve the modal behavior of lasers and to reduce spatial-hole burning effects by preferentially localizing current injection in the center of the structure, hence discriminating the optical mode. We report the first realization of distributed electrode lasers emitting at 808 nm with the measured full width at half maximum (FWHM) angle of the minimal horizontal angle as 3.8° while the maximum continuous-wave output power is up to 4 W and high slope efficiencies as high as 0.95 W/A.

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46

Luo, Xiao Bin, Wei Hua Yu, De Chun Guo, and Zhi Ming Wang. "Simulation of an AlGaN/GaN HEMT for Ka-Band." Advanced Materials Research 748 (August 2013): 864–67. http://dx.doi.org/10.4028/www.scientific.net/amr.748.864.

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A physical model of 0.24μm gate-length and 50μm gate-width AlGaN/GaN HEMTs is designed in the paper including lateral structure and longitudinal material parameters. Then DC and high frequency characteristics are both simulated and analyzed. The results show that the saturation drain current is 0.8A/mm at zero bias and the maximum transconductance is 350mS/mm. The current gain cutoff frequency (fT) and maximum frequency of oscillation (fmax) are 35GHz and 107GHz respectively at -2V gate voltage and 25V drain voltage. The maximum available power gains (MAG) is 10.2dB at 40GHz. Therefore, the structure can be applied to Ka-band.

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47

Kawale, Praniali Surendra. "High Voltage Gain Interleaved Boost Converter with Neural Network Based MPPT Controller for Fuel Cell Based Electric Vehicle Applications." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (June 30, 2021): 4728–32. http://dx.doi.org/10.22214/ijraset.2021.35499.

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As a result of the strict regulations on carbon emissions and the fuel economy, fuel cell electric vehicles (FCEV) vehicles are becoming increasingly popular in the automotive industry. This paper provides the Neural Network Maximum Power Point Tracking (MPPT) controller of the 1.26 kW Proton Exchange Membrane Fuel Cell (PEMFC), which provides electric vehicle powertrain using DC-DC power converters. The proposed neural network controls the MPPT Radial Basis Function Network (RBFN) using the PEMFC Maximum PowerPoint (MPP) tracking algorithm. High frequency switching and high DC-DC converting power are important for FCEV continuity. For maximum power gain, a three-phase power supply interleaved boost converter (IBC) is also designed for the FCEV system. The interleaving process reduces the current input pressure and electrical pressure in semiconductor electrical equipment. FCEV system performance analysis with RBFN based MPPT control compared to fuzzy logic controllers (FLC) on the MATLAB / Simulink platform.

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48

Siva, Asapu, and Vanitha Rajendran. "A novel auxiliary unit based high gain DC-DC converter for solar PV system with MPPT control." International Journal of Power Electronics and Drive Systems (IJPEDS) 13, no. 4 (December 1, 2022): 2386. http://dx.doi.org/10.11591/ijpeds.v13.i4.pp2386-2395.

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Анотація:

<span lang="HR">Solar photovoltaic (PV) system becomes popular to generate the electricity in Asian region and helps to reduce the burden to utility. The power converter plays crucial role to interconnect with DC- grid. Traditional type power DC-DC converter can able to extract the maximum power from solar PV. However, most of the applications, it often fails to meet the voltage level of the DC bus and additional converter is required to boosting p the DC voltage. In order to overcome this drawback, this paper proposes a novel DC-DC converter to extract the maximum power from solar PV and helps to enhance the voltage level to meet the DC-bus. The PV and IV characteristics of practical solar PV cell and mathematical modelling have been done and implemented the same to proposed high gain converter. The maximum power point tracking (MPPT) algorithm and operation details are addressed and the detailed operation waveform of proposed high voltage gain DC-DC converter with mathematical evident is reported in this paper. The simulation study was carried out in the PSCAD/EMDTC software. From the measured results, it is investigated in further to validate the MPPT operation, gain values achievement and performance analysis of proposed converter. The corresponding explanations and results are presented in this article.</span>

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49

Vitee, Nandini, Harikrishnan Ramiah, Wei-Keat Chong, Gim-Heng Tan, Jeevan Kanesan, and Ahmed Wasif Reza. "50 MHz–10 GHz Low-Power Resistive Feedback Current-Reuse Mixer with Inductive Peaking for Cognitive Radio Receiver." Scientific World Journal 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/683971.

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Анотація:

A low-power wideband mixer is designed and implemented in 0.13 µm standard CMOS technology based on resistive feedback current-reuse (RFCR) configuration for the application of cognitive radio receiver. The proposed RFCR architecture incorporates an inductive peaking technique to compensate for gain roll-off at high frequency while enhancing the bandwidth. A complementary current-reuse technique is used between transconductance and IF stages to boost the conversion gain without additional power consumption by reusing the DC bias current of the LO stage. This downconversion double-balanced mixer exhibits a high and flat conversion gain (CG) of 14.9 ± 1.4 dB and a noise figure (NF) better than 12.8 dB. The maximum input 1-dB compression point (P1dB) and maximum input third-order intercept point (IIP3) are −13.6 dBm and −4.5 dBm, respectively, over the desired frequency ranging from 50 MHz to 10 GHz. The proposed circuit operates down to a supply headroom of 1 V with a low-power consumption of 3.5 mW.

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50

Yusof, N. Roshidah, N. A. M. Ahmad Hambali, R. Othman, W. Mokhzani, and M. H. A. Wahid. "Optimization of L-Band Ring Cavity Brillouin Erbium Fiber Laser." Applied Mechanics and Materials 815 (November 2015): 380–83. http://dx.doi.org/10.4028/www.scientific.net/amm.815.380.

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In this paper, the performance of ring cavity Brillouin Erbium fiber laser (BEFL) within L-band wavelength region are discussed. Introducing Erbium doped fiber as a secondary gain medium into conventional Brillouin fiber laser configuration is the best alternative to maximize the Brillouin Stokes power (output power) and to sustain the gain flatness. Few parameters comprising length of fiber, pump power and tunable laser source power are varied to obtain the optimum output power. From the simulation process, a maximum Brillouin Stokes power of 54.75 dBm is produced as 16 dBm Brillouin pump power and 1480 nm pump laser are injected to the configuration.

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