Relevant bibliographies by topics / Integrated magnetics

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Integrated magnetics'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 September 2023

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Journal articles on the topic "Integrated magnetics"

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Gao, Shengwei, Hao Wang, and Kishor Tarafdar. "Phase shift control dual active bridge converter with integrated magnetics." Journal of Computational Methods in Sciences and Engineering 20, no. 3 (2020): 727–42. http://dx.doi.org/10.3233/jcm-204132.

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Traditional dual active bridge converters use transformer leakage inductance instead of energy storage inductors for magnetic integration, but this method cannot accurately control the leakage inductance. A phase shift control dual active bridge converter base on integrated magnetics is proposed, in which one transformer and one inductor are integrated in an EE core. The size of the inductance can be accurately controlled. The transformer and the inductor are decoupled and integrated so that the two operating states do not affect each other. The weight and volume of the magnetic elements are reduced accordingly. The finite element analysis and magnetic circuit simulation of the integrated magnetics are carried out. Finally, the integrated magnetics are designed and applied to the 600W prototype to realize bidirectional power transmission and a weight reduction is about 36.24% and a volume reduction is about 35.84%. The correctness of the design is verified by experimental results.
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Amiri Roodan, Venoos, Jenifer Gómez-Pastora, Ioannis H. Karampelas, et al. "Formation and manipulation of ferrofluid droplets with magnetic fields in a microdevice: a numerical parametric study." Soft Matter 16, no. 41 (2020): 9506–18. http://dx.doi.org/10.1039/d0sm01426e.

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Integrated computational fluid dynamics and magnetics simulation is employed to analyze the effects of magnetic force on the formation and manipulation of ferrofluid droplets within a flowing non-magnetic continuous phase in a microfluidic device.
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Sun, J., K. F. Webb, and V. Mehrotra. "Integrated Magnetics for Current-Doubler Rectifiers." IEEE Transactions on Power Electronics 19, no. 3 (2004): 582–90. http://dx.doi.org/10.1109/tpel.2004.826423.

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Aitmani, N., Y. Ousten, J. L. Aucouturier, D. Michaux, and P. Mas. "Integrated Magnetics Components Using Thick Film Hybrid Technology." Microelectronics International 6, no. 1 (1989): 18–21. http://dx.doi.org/10.1108/eb044352.

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Jang, Y., M. M. Jovanovic, and D. L. Dillman. "Hold-up time extension Circuit with integrated magnetics." IEEE Transactions on Power Electronics 21, no. 2 (2006): 394–400. http://dx.doi.org/10.1109/tpel.2005.869750.

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Roshen, Waseem A., Charlie S. Korman, and Wolfgang Daum. "High density interconnect embedded magnetics for integrated power." IEEE Transactions on Power Electronics 21, no. 4 (2006): 867–79. http://dx.doi.org/10.1109/tpel.2006.876893.

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Roy, S., A. Connell, M. Ludwig, et al. "Pulse reverse plating for integrated magnetics on Si." Journal of Magnetism and Magnetic Materials 290-291 (April 2005): 1524–27. http://dx.doi.org/10.1016/j.jmmm.2004.11.566.

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Roy, Sudhin, and L. Umanand. "Integrated Magnetics-Based Multisource Quality AC Power Supply." IEEE Transactions on Industrial Electronics 58, no. 4 (2011): 1350–58. http://dx.doi.org/10.1109/tie.2010.2049712.

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Liu, Yu-Chen, Cheng-You Xiao, Chien-Chun Huang, Pei-Chin Chi, and Huang-Jen Chiu. "Integrated Magnetics Design for a Full-Bridge Phase-Shifted Converter." Energies 14, no. 1 (2020): 183. http://dx.doi.org/10.3390/en14010183.

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In this study, an optimization procedure was proposed for the magnetic component of an integrated transformer applied in a center-tap phase-shifted full-bridge converter. To accommodate high power–density 0demand, a transformer and an output inductor were integrated into a magnetic component to reduce the volume of the magnetic material and the primary and secondary windings of the transformer were wound on the magnetic legs to reduce conduction loss attributable to the alternating-current resistor. With a focus on the integrated transformer applied in a phase-shifted full-bridge converter, circuit operation in each time interval was analyzed, and a design procedure was established for the integrated magnetic component. In addition, the manner in which output inductance was affected by the mutual inductance between the transformer and the output inductor in the integrated transformer during various operation intervals was discussed and, to minimize circuit loss, a design optimization procedure for the magnetic core was proposed. Finally, the integrated transformer was applied in a phase-shifted full-bridge converter to achieve an input voltage of 400 V, an output voltage of 12 V, output power of 1.7 kW, an output frequency of 80 kHz, and a maximum conversion efficiency of 96.7%.
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Chen, Qingbin. "The Structure and Its Leakage Inductance Model of Integrated LLC Transformer With Wide Range Value Variation." CPSS Transactions on Power Electronics and Applications 7, no. 4 (2022): 409–20. http://dx.doi.org/10.24295/cpsstpea.2022.00037.

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The integrated magnetics technology is famous in academic and industrial applications to achieve low profile and high power density of switch-mode power supply (SMPS). The integrated LLC transformer is widely used in LLC converter, where the transformer and resonant inductor are integrated into a magnetic component. However, the value Variation range of leakage inductance of conventional integrated transformer structures is limited due to the low profile and small volume in some planar applications. In this paper, a new integrated LLC transformer structure and its leakage inductance adjustment method are proposed. Based on the two-dimensional equivalent model of the structure, the distribution of the leakage magnetic field and the leakage inductance calculation model of the proposed transformer structure are established. The proposed structure can improve the value variation range of leakage inductance in some special applications and is easily achieved in the planner structure. Finally, the design guideline of the proposed integrated LLC transformer is obtained. Simulation results and prototype experiment results verify the correctness and flexibility of the theoretical analysis.
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Dissertations / Theses on the topic "Integrated magnetics"

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Araghchini, Mohammad. "(MEMS) toroidal magnetics for integrated power electronics." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/84882.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2013.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 237-241).<br>Power electronics represent a key technology for improving the functionality and performance, and reducing the energy consumption of many systems. However, the size, cost, and performance constraints of conventional power electronics currently limit their use. This is especially true in relatively high-voltage, low-power applications such as off-line power supplies, light-emitting diode (LED) drivers, converters and inverters for photovoltaic panels, and battery interface converters; a LED driver application serves as a motivation example throughout the thesis. Advances in the miniaturization and integration of energy-conversion circuitry in this voltage and power range would have a tremendous impact on many such applications. Magnetic components are often the largest and most expensive components in power electronic circuits and are responsible for a large portion of the power loss. As operating frequencies are increased, the physical size of the passives can, in theory, be reduced while maintaining or improving efficiency. Realizing this reduction in size and the simultaneous improvement in efficiency and power density of power electronic circuits requires improvements in magnetics technology. This thesis focuses on the challenge of improving magnetics through the analysis, optimization, and design of air-core toroidal inductors for integration into high-efficiency, high-frequency power electronic circuits. The first part of the thesis presents the derivation of models for stored energy, resistance and parasitic capacitance of microfabricated toroidal inductors developed for use in integrated power electronics. The models are then reduced to a sinusoidal-steady-state equivalent-circuit model. Two types of toroidal MEMS inductors are considered: in-silicon inductors (with or without silicon core) and in-insulator inductors. These inductors have low profiles and a single-layer winding fabricated via high-aspect-ratio molding and electroplating. Such inductors inevitably have a significant gap between winding turns. This makes the equivalent resistance more difficult to model. The low profile increases the significance of energy stored in the winding which, together with the winding gap, makes the equivalent inductance more difficult to model as well. The models presented in this thesis account for these effects. In the case of in-silicon inductors, magnetically and electrically driven losses in different regions of silicon are modeled analytically as well. The second part of the thesis focuses on the optimized design of microfabricated toroidal inductors for a LED driver. The models developed in the first part of the thesis allow optimization of inductor designs based on objectives such as minimizing substrate area, maximizing efficiency, and simplifying the fabrication process by maximizing minimum feature size. Because the magnetics size and loss depend strongly on the driver design parameters, and the driver performance depends strongly on the inductance value and loss, the simultaneous optimization of driver components and magnetics parameters is used in the design process. The use of computationally efficient models for both magnetics and other circuit components permits numerical optimization using the general co-optimization approach. Finally, a multi-dimensional Pareto-optimal filtering is applied to reduce the feasible design set to those on the multi-objective optimality frontier. For the case of LED drivers, the current state of the art efficiencies range from 65% to 90%. The co-optimization process results in efficiencies greater than 90% while reducing the size of the LED driver by 10 to 100 times compared to the commercially available LED drivers. This is a significant improvement in both the efficiency and the size of the LED drivers. In the resulting designs, the magnetics are no longer the largest part of the circuit. In the third part of the thesis several numerical and experimental tests are presented. The models developed in this thesis, are verified against results from 2D FEA, 3D FEA, direct measurement of MEMS fabricated devices (for both in-insulator devices for flip-chip bonding and in-silicon devices for direct integration), and in-circuit experimentation of the fabricated devices. These tests show that the equivalent-circuit models presented in this thesis have greater accuracy than existing models. The results also show that these models are good enough to support the LED driver optimization.<br>by Mohammad Araghchini.<br>Ph.D.
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Chen, Wei. "Low Voltage High Current Power Conversion with Integrated Magnetics." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30518.

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Very low voltage, high current output requirement have necessitated improvements in power supply's density and efficiency. Existing power conversion techniques cannot meet very stringent size and efficiency requirements. By applying the proposed magnetic integration procedure, new integrated magnetic circuits featuring low loss, simple structure, and ripple cancellation technique are then developed to overcome the limitations of prior art. Both cores and windings are integrated. Consequently, the power loss and the size of the integrated magnetic device are greatly reduced. Detailed analysis and design considerations of the proposed circuits are presented. As a result of applying the proposed technique, very high density, high efficiency, low voltage, high current power modules were developed. A typical example features an isolated 3.3V/30A power module with a power density of 130W/in3 and an efficiency of 90% at 500 KHz switching frequency.<br>Ph. D.
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Reusch, David Clayton. "High Frequency, High Current Integrated Magnetics Design and Analysis." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/35420.

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The use of computers in the modern world has become prevalent in all aspects of life. The size of these machines has decreased dramatically while the capability has increased exponentially. A special DC-DC converter called a VRM (Voltage Regulator Module) is used to power these machines. The VRM faces the task of supplying high current and high di/dt to the microprocessor while maintaining a tight load regulation. As computers have advanced, so have the VRM's used to power them. Increasing the current and di/dt of the VRM to keep up with the increasing demands of the microprocessor does not come without a cost. To provide the increased di/dt, the VRM must use a higher number of capacitors to supply the transient energy. This is an undesirable solution because of the increased cost and real estate demands this would lead to in the future. Another solution to this problem is to increase the switching frequency and control bandwidth of the VRM. As the switching frequency increases the VRM is faced with efficiency and thermal problems. The current buck topologies suffer large drops in efficiency as the frequency increases from high switching losses. <p> Resonant or soft switching topologies can provide a relief from the high switching loss for high frequency power conversion. One disadvantage of the resonant schemes is the increased conduction losses produced by the circulating energy required to produce soft switching. As the frequency rises, the additional conduction loss in the resonant schemes can be smaller than the switching loss encountered in the hard switched buck. The topology studied in this work is the 12V non-isolated ZVS self-driven presented in [1]. This scheme offered an increased efficiency over the state of the art industry design and also increased the switching frequency for capacitor reduction. The goal of this research was to study this topology and improve the magnetic design to decrease the cost while maintaining the superior performance. <p> The magnetics used in resonant converters are very important to the success of the design. Often, the leakage inductance of the magnetics is used to control the ZVS or ZCS switching operation. This work presents a new improved magnetic solution for use in the 12V non-isolated ZVS self-driven scheme which increases circuit operation, flexibility, and production feasibility. The improved magnetic structure is simulated using 3D FEA verification and verified in hardware design.<br>Master of Science
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zhou, hua. "MAGNETICS DESIGN FOR HIGH CURRENT LOW VOLTAGE DC/DC CONVERTER." Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3381.

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With the increasing demand for small and cost efficient DC/DC converters, the power converters are expected to operate with high efficiency. Magnetics components design is one of the biggest challenges in achieving the higher power density and higher efficiency due to the significant portion of magnetics components volume in the whole power system. At the same time, most of the experimental phenomena are related to the magnetics components. So, good magnetics components design is one of the key issues to implement low voltage high current DC/DC converter. Planar technology has many advantages. It has low profile construction, low leakage inductance and inter-winding capacitance, excellent repeatability of parasitic properties, cost efficiency, great reliability, and excellent thermal characteristics. On the other side, however, planar technology also has some disadvantages. Although it improves thermal performance, the planar format increases footprint area. The fact that windings can be placed closer in planar technology to reduce leakage inductance also often has an unwanted effect of increasing parasitic capacitances. In this dissertation, the planar magnetics designs for high current low voltage applications are thoroughly investigated and one CAD design methodology based on FEA numerical analysis is proposed. Because the frequency dependant parasitic parameters of magnetics components are included in the circuit model, the whole circuit analysis is more accurate. When it is implemented correctly, integrated magnetics technique can produce a significant reduction in the magnetic core content number and it can also result in cost efficient designs with less weight and smaller volume. These will increase the whole converter's power density and power efficiency. For high output current and low output voltage applications, half bridge in primary and current doublers in secondary are proved to be a very good solution. Based on this topology, four different integrated magnetics structures are analyzed and compared with each other. One unified model is introduced and implemented in the circuit analysis. A new integrated magnetics component core shape is proposed. All simulation and experimental results verify the integrated magnetics design. There are several new magnetics components applications shown in the dissertation. Active transient voltage compensator is a good solution to the challenging high slew rate load current transient requirement of VRM. The transformer works as an extra voltage source. During the transient periods, the transformer injects or absorbs the extra transient to or from the circuit. A peak current mode controlled integrated magnetics structure is proposed in the dissertation. Two transformers and two inductors are integrated in one core. It can force the two input capacitors of half bridge topology to have the same voltage potential and solve the voltage unbalance issue. The proposed integrated magnetics structure is simple compared with other methods implementing the current mode control to half bridge topology. Circuit analysis, simulation and experimental results verify the feasibility of these applications.<br>Ph.D.<br>School of Electrical Engineering and Computer Science<br>Engineering and Computer Science<br>Electrical Engineering PhD
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Garcha, Preetinder(Preetinder Kaur). "Low power circuits with integrated magnetics for sensors and energy harvesting systems." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/127019.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, May, 2020<br>Cataloged from the official PDF of thesis.<br>Includes bibliographical references (pages 145-151).<br>The continued expansion of Internet of Things has led to a proliferation of wireless sensors and systems across the globe. The application space for sensors is wide-ranging: from industries, to serve the upcoming era of Industry 4.0, to consumer products, like body wearable sensors. The rise to billions of sensors relies on two key trends in sensor systems: miniaturization and energy-efficiency. This work explores the use of integrated magnetics in microelectronics to enable low power, energy-efficient sensing, as well as energy harvesting to power the sensors, in a compact form factor. For industrial applications, we present the design of a bandwidth-scalable, integrated fluxgate magnetic-to-digital converter for energy-efficient contactless current sensing in smart connectors. The system uses mixed signal front-end design to en-able duty cycling and quick convergence techniques leading to 20x reduction in power consumption at low bandwidths of 1 kHz for power monitoring. It also employs fast read-out circuits to achieve a bandwidth of 125 kHz for machine health diagnosis. For personal body wearable electronics and beyond, we present the design of a cold start system with integrated magnetics for ultra low voltage startup in thermal energy harvesting applications. The Meissner Oscillator analysis with on-chip magnetics allows co-optimization of magnetics and circuits to achieve start up from as low as 25 mV input voltage to the circuits, despite 1000x lower inductance than off-chip transformers. Given the recent push towards artificial intelligence and a growing need for data, along with sensors to collect that data, we need to explore novel uses of technologies to meet the demands for small form factor and low power operation, as the number of sensors scale. The ideas presented in this thesis, with two very different applications of the integrated magnetics technology, can contribute to the continued growth towards trillions of sensors.<br>by Preetinder Garcha.<br>Ph. D.<br>Ph.D. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science
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Sterk, Douglas Richard. "Compact Isolated High Frequency DC/DC Converters Using Self-Driven Synchronous Rectification." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/9648.

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In the early 1990's, with the boom of the Internet and the advancements in telecommunications, the demand for high-speed communications systems has reached every corner of the world in forms such as, phone exchanges, the internet servers, routers, and all other types of telecommunication systems. These communication systems demand more data computing, storage, and retrieval capabilities at higher speeds, these demands place a great strain on the power system. To lessen this strain, the existing power architecture must be optimized. With the arrival of the age of high speed and power hungry microprocessors, the point of load converter has become a necessity. The power delivery architecture has changed from a centralized distribution box delivering an entire system's power to a distributed architecture, in which a common DC bus voltage is distributed and further converted down at the point of load. Two common distributed bus voltages are 12 V for desktop computers and 48 V for telecommunications server applications. As industry strives to design more functionality into each circuit or motherboard, the area available for the point of load converter is continually decreasing. To meet industries demands of more power in smaller sizes power supply designers must increase the converter's switching frequencies. Unfortunately, as the converter switching frequency increases the efficiency is compromised. In particular, the switching, gate drive and body diode related losses proportionally increase with the switching frequency. This thesis introduces a loss saving self-driven method to drive the secondary side synchronous rectifiers. The loss saving self-driven method introduces two additional transformers that increase the overall footprint of the converter. Also, this thesis proposes a new magnetic integration method to eliminate the need for the two additional gate driver magnetic cores by allowing three discrete power signals to pass through one single magnetic structure. The magnetic integration reduces the overall converter footprint.<br>Master of Science
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Li, Bin. "High Frequency Bi-directional DC/DC Converter with Integrated Magnetics for Battery Charger Application." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/97874.

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Due to the concerns regarding increasing fuel cost and air pollution, plug-in electric vehicles (PEVs) are drawing more and more attention. PEVs have a rechargeable battery that can be restored to full charge by plugging to an external electrical source. However, the commercialization of the PEV is impeded by the demands of a lightweight, compact, yet efficient on-board charger system. Since the state-of-the-art Level 2 on-board charger products are largely silicon (Si)-based, they operate at less than 100 kHz switching frequency, resulting in a low power density at 3-12 W/in3, as well as an efficiency no more than 92 - 94% Advanced power semiconductor devices have consistently proven to be a major force in pushing the progressive development of power conversion technology. The emerging wide bandgap (WBG) material based power semiconductor devices are considered as game changing devices which can exceed the limit of Si and be used to pursue groundbreaking high frequency, high efficiency, and high power density power conversion. Using wide bandgap devices, a novel two-stage on-board charger system architecture is proposed at first. The first stage, employing an interleaved bridgeless totem-pole AC/DC in critical conduction mode (CRM) to realize zero voltage switching (ZVS), is operated at over 300 kHz. A bi-directional CLLC resonant converter operating at 500 kHz is chosen for the second stage. Instead of using the conventional fixed 400 V DC-link voltage, a variable DC-link voltage concept is proposed to improve the efficiency within the entire battery voltage range. 1.2 kV SiC devices are adopted for the AC/DC stage and the primary side of DC/DC stage while 650 V GaN devices are used for the secondary side of the DC/DC stage. In addition, a two-stage combined control strategy is adopted to eliminate the double line frequency ripple generated by the AC/DC stage. The much higher operating frequency of wide bandgap devices also provides us the opportunity to use PCB winding based magnetics due to the reduced voltage-second. Compared with conventional litz-wire based transformer. The manufacture process is greatly simplified and the parasitic is much easier to control. In addition, the resonant inductors are integrated into the PCB transformer so that the total number of magnetic components is reduced. A transformer loss model based on finite element analysis is built and used to optimize the transformer loss and volume to get the best performance under high frequency operation. Due to the larger inter-winding capacitor of PCB winding transformer, common mode noise becomes a severe issue. A symmetrical resonant converter structure as well as a symmetrical transformer structure is proposed. By utilizing the two transformer cells, the common mode current is cancelled within the transformers and the total system common mode noise can be suppressed. In order to charge the battery faster, the single-phase on-board charger concept is extended to a higher power level. By using the three-phase interleaved CLLC resonant converter, the charging power is pushed to 12.5 kW. In addition, the integrated PCB winding transformer in single phase is also extended to the three phase. Due to the interleaving between each phase, further integration is achieved and the transformer size is further reduced.<br>PHD
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Hsiu, Leng-nien. "Low ripple and noise DC/DC converter with quasi-resonant switching and integrated magnetics." Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/187413.

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A low output ripple and noise converter is achieved by employing a zero-voltage switch (ZVS), an integrated magnetics structure which couples a transformer and several coupled inductors in one core, and several auxiliary packaging designs. In the steady-state analysis, the operation of ZVS converter is described and the ZVS switch resonant component design procedure is developed. An optimized geometrical core constant integrated magnetics design procedure is proposed. Some auxiliary packaging design considerations are addressed. The converter ac analysis is divided into two parts to observe the individual small signal effect introduced by the ZVS switch and coupled inductor. The uncoupled-inductor converter ac analysis is conducted by a new approach: an extended circuit averaging method. The converter ac model is obtained by substituting in the coupled inductor ac model to the uncoupled-inductor converter ac model. It is found both the dc coupled inductor zero current ripple condition and the ac converter transfer function response are affected by the turns ratio and the leakage inductance of the coupled inductor. Hence, the converter dc and ac designs are coupled by the coupled inductor operation. Experimental results of the dc and ac analysis of a ZVS converter with coupled inductor are shown. Integrated magnetics achieves less than 3% peak-to-peak current ripple on both coupled inductors at the same time. The equivalent result by separate magnetics approach requires twice the volume implemented by the integrated magnetics structure.
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Xu, Peng. "Multiphase Voltage Regulator Modules with Magnetic Integration to Power Microprocessors." Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/26395.

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Advances in very large scale integration (VLSI) technologies impose challenges for voltage regulator modules (VRM) to deliver high-quality power to modern microprocessors. As an enabling technology, multiphase converters have become the standard practice in VRM industry. The primary objectives of this dissertation are to develop advanced topologies and innovative integrated magnetics for high-efficiency, high-power-density and fast-transient VRMs. The optimization of multiphase VRMs has also been addressed. Todayâ s multiphase VRMs are almost universally based on the buck topology. With increased input voltage and decreased output voltage, the multiphase buck converter suffers from a very small duty cycle and cannot achieve a desirable efficiency. The multiphase tapped-inductor buck converter is one of the simplest topologies with a decent duty cycle. However, the leakage inductance of its tapped inductors causes a severe voltage spike problem. An improved topology, named the multiphase coupled-buck converter, is proposed. This innovative topology enables the use of a larger duty cycle with clamped device voltage and recovered leakage energy. Under the same transient responses, the multiphase coupled-buck converter has a significantly better efficiency than the multiphase buck converter. By integrating all the magnetic components into a single core, in which the windings are wound around the center leg and the air gaps are placed on the two outer legs, it is possible for multiphase VRMs to further improve efficiency and cut the size and cost. Unfortunately, this structure suffers from an undesirable core structure and huge leakage inductance. An improved integrated magnetic structure is proposed to overcome these limitations. All the windings are wound around the two outer legs and the air gap is placed on the center leg. The improved structure also features the flux ripple cancellation in the center leg and strongly reverse-coupled inductors. Both core loss and winding loss are reduced. The steady-state current ripples can be reduced without compromising the transient responses. The overall efficiency of the converter is improved. The input inductor can also be integrated in the improved integrated magnetic structure. Currently, selecting the appropriate number of channels for multiphase VRMs is still an empirical trial-and-error process. This dissertation proposes a methodology for determining the right number of channels for the optimal multiphase design. The problem formulation and general method for the optimization are proposed. Two examples are performed step by step to demonstrate the proposed optimization methodology. Both are focused on typical VRM 9.0 designs for the latest Pentium 4® microprocessors and their results are compared with the industry practice.<br>Ph. D.
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Cai, Yinsong. "Optimal Design of MHz LLC Converter for 48V Bus Converter Application." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/93582.

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The intermediate bus architecture employing the 48V bus converter is one of the most popular power architecture. 48V to 12V bus converter has wide applications in telecommunications, networks, aerospace, and military, etc. However, today's state of the art products has low power rating or power density and becomes difficult to satisfy the demand of increasing power of the loads. To improve the current design, a GaN (Gallium Nitride) based two-stage solution is proposed for the bus converter. The first stage Buck converter regulates the 40V to 60V variable input to a fixed 36V bus voltage. The second stage LLC converter convert the 36V to 12V by a 3:1 transformer. The whole solution achieves the fixed frequency control. The thesis focus on the detail design and optimization of LLC converter, especially its transformer. To have high density and high efficiency, the transformer design becomes critical at MHz frequency. The matrix transformer concept is applied and a merged winding structure is used for flux cancellation, which effectively reduces the AC winding losses. A new fully interleaved termination and via design is proposed. It achieves significant reduction in loss and leakage flux. In addition, to study the current sharing of parallel winding layers, a 1-D analytic model is proposed and a symmetrical winding layer scheme is used to balance the current distribution. The hardware is built and tested. The proposed two-stage converter achieves the best performance compared to the current market.<br>Master of Science<br>Intermediate bus architecture (IBA) has wide applications in telecommunication, server and computing, and military power supplies. The intermediate bus converter (IBC) is the key stage in the IBA, where the DC bus voltage from the front-end power supply is converted to a lower intermediate bus voltage. Traditional IBC suffers from bulky magnetic components including inductors and transformers. This work illustrates the design and implementation of a two-stage IBC, where the first-stage Buck converter will provide regulation and the second stage LLC converter will provide isolation. Thanks to the soft-switching capability of LLC, the magnetic volume can be significantly reduced by raising the switching frequency of the converter. Therefore, planar magnetics can be used and placed directly inside of the printing circuit board (PCB), which allows for higher power densities and easy manufacturing of the magnetics and overall converter. However, as the frequency goes higher, the AC losses of the transformer caused by the eddy current, skin effect, and proximity effect become dominant. As a result, high-frequency transformer design becomes the key for the converter design. First, matrix transformer concept is applied to distribute the high current and reduce the conduction loss. Second, a novel merged winding structure is proposed for better transformer winding interleaving. Third, a new terminal structure of the transformer is proposed. Finally, the current sharing between parallel windings are modeled and studied. All the efforts result in great loss reduction. The prototype were verified and compared to the current converters that are on the market in the 48V – 12V area of IBCs.
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Books on the topic "Integrated magnetics"

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Aklimi, Eyal. Magnetics and GaN for Integrated CMOS Voltage Regulators. [publisher not identified], 2016.

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Andrew, Kenny, Palazzolo Alan B, and NASA Glenn Research Center, eds. An integrated magnetic circuit model and finite element model approach to magnetic bearing design. NASA Glenn Research Center, 2003.

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Sturcken, Noah. Integrated Voltage Regulators with Thin-Film Magnetic Power Inductors. [publisher not identified], 2013.

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Microfluidic Concentration Gradient Generation and Integrated Magnetic Sorting of Microparticles. [publisher not identified], 2013.

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G, Andritzky, Geological Survey (Namibia), and Support to the Geological Survey/Mineral Prospecting Promotion (PN 90.2214.6) (Project : Namibia), eds. Integrated investigation of magnetic patterns in the Sinclair-Helmeringhausen area. Bundesanstalt für Geowissenschaften und Rohstoffe, 1996.

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Douglas, Adam J., ed. Magnetic thin film devices. Academic Press, 2000.

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G, Andritzky, Geological Survey (Namibia), and Support to the Geological Survey/Mineral Prospecting Promotion (PN 90.2214.6) (Project : Namibia), eds. Integrated investigation of magnetic patterns in and around the Rosh Pinah area. Bundesanstalt für Geowissenschaften und Rohstoffe, 1996.

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Reiskarimian, Negar. Fully-Integrated Magnetic-Free Nonreciprocal Components by Breaking Lorentz Reciprocity: From Physics to Applications. [publisher not identified], 2020.

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F, Aichner, and European Magnetic Resonance Forum, eds. Three-dimensional magnetic resonance imaging: An integrated clinical up-date of 3D-imaging and 3D-postprocessing : proceedings of a joint meeting in Obergurgl, Austria, 23-27 March 1992. Blackwell Scientific Publications, 1994.

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Symposium '89 (1989 Phoenix, Ariz.). An integrated physical and imaging approach to the clinical diagnosis and management of trauma and conditions affecting the cervical spine, the lumbar spine & the extremities. American Chiropractic Association Council on Diagnostic Imaging and Council on Chiropractic Orthopedics, 1989.

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Book chapters on the topic "Integrated magnetics"

1

Severns, Rudolf P., and Gordon Ed Bloom. "Converters with Integrated Magnetics." In Modern DC-to-DC Switchmode Power Converter Circuits. Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-011-8085-6_12.

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Löcker, Klaus, Jakob Gallistl, Christian Gugl, et al. "Protected by shooting at it - the Öde Kloster and an associated Roman settlement within the military training area Bruckneudorf, Austria." In Advances in On- and Offshore Archaeological Prospection. Universitätsverlag Kiel | Kiel University Publishing, 2023. http://dx.doi.org/10.38072/978-3-928794-83-1/p36.

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The archaeological prospection focused on a multiphase fortified settlement. It was conducted as an integrated survey using airborne laserscanning (ALS) data, aerial photography, magnetics and GPR. The results show among other things that restricted military areas provide outstanding conditions for the preservation of archaeological sites.
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Baltes, Henry, and Arokia Nathan. "Integrated Magnetic Sensors." In Sensors. Wiley-VCH Verlag GmbH, 2008. http://dx.doi.org/10.1002/9783527620128.ch7.

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Hidaka, Hideto. "Embedded Magnetic RAM." In Integrated Circuits and Systems. Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-88497-4_7.

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Priest, E. R., and D. I. Pontin. "Magnetic Reconnection." In The Sun and the Heliosphere as an Integrated System. Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2831-1_14.

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Thompson, Roy, and Frank Oldfield. "The Rhode River, Chesapeake Bay, an integrated catchment study." In Environmental Magnetism. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-011-8036-8_16.

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Hoshino, Kazunori. "Magnetic Separation in Integrated Micro-Analytical Systems." In Clinical Applications of Magnetic Nanoparticles. CRC Press, 2018. http://dx.doi.org/10.1201/9781315168258-11.

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Garcia-Valenzuela, A., and M. Tabib-Azar. "Comparison Between Electric, Magnetic, and Optical Sensors." In Integrated Optics, Microstructures, and Sensors. Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-2273-7_15.

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Liu, Yong, Hakho Lee, Donhee Ham, and Robert M. Westervelt. "CMOS-based Magnetic Cell Manipulation System." In Series on Integrated Circuits and Systems. Springer US, 2007. http://dx.doi.org/10.1007/978-0-387-68913-5_5.

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Nahavandi, Saeid, Fuleah A. Razzaq, Shady Mohamed, Asim Bhatti, and Peter Brotchie. "Locally Sparsified Compressive Sensing in Magnetic Resonance Imaging." In Integrated Systems: Innovations and Applications. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15898-3_12.

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Conference papers on the topic "Integrated magnetics"

1

Watanabe, T. "An integrated suspension for high performance hard drives." In IEEE International Magnetics Conference. IEEE, 1999. http://dx.doi.org/10.1109/intmag.1999.837985.

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Li, J., X. Zhang, H. Zhang, and C. Gerada. "Control integrated studies on HSPGS." In 2015 IEEE International Magnetics Conference (INTERMAG). IEEE, 2015. http://dx.doi.org/10.1109/intmag.2015.7156792.

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Lee, Y. H., H. C. Kwon, J. M. Kim, Y. K. Park, and J. C. Park. "A low-noise integrated squid gradiometer for biomagnetic sensor." In IEEE International Magnetics Conference. IEEE, 1999. http://dx.doi.org/10.1109/intmag.1999.837185.

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Shirakawa, K., K. Yamaguchi, A. Hirata, and T. Yamaoka. "Thin film cloth-structured inductor for magnetic integrated circuit." In International Conference on Magnetics. IEEE, 1990. http://dx.doi.org/10.1109/intmag.1990.734718.

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Takayama, A., T. Umehara, A. Yuguchi, H. Kato, K. Mohri, and U. Uchiyama. "Integrated thin film magneto-impedance sensor head using plating process." In IEEE International Magnetics Conference. IEEE, 1999. http://dx.doi.org/10.1109/intmag.1999.837576.

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Kamabe, H., and H. Katou. "Coding gain by Integrated Interleaving ECC." In INTERMAG 2006 - IEEE International Magnetics Conference. IEEE, 2006. http://dx.doi.org/10.1109/intmag.2006.376514.

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Van Kerckhoven, V. "Substrate integrated waveguide based on ferromagnetic nanowires." In 2017 IEEE International Magnetics Conference (INTERMAG). IEEE, 2017. http://dx.doi.org/10.1109/intmag.2017.8008017.

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Kim, H., Y. Kim, and J. Kim. "An Integrated LTCC Inductor Embedding NiZn Ferrite." In INTERMAG 2006 - IEEE International Magnetics Conference. IEEE, 2006. http://dx.doi.org/10.1109/intmag.2006.376077.

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Lok, B. K., Kyung W. Paik, L. L. Wai, W. Fan, Albert C. W. Lu, and K. P. Pramoda. "Low temperature processing for integrated magnetics." In 2007 International Conference on Electronic Materials and Packaging (EMAP 2007). IEEE, 2007. http://dx.doi.org/10.1109/emap.2007.4510280.

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Cuk, Slobodan. "Integrated Magnetics versus Conventional Power Filtering." In 1987 The Ninth International Telecommunications Energy Conference. IEEE, 1987. http://dx.doi.org/10.1109/intlec.1987.4794530.

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Reports on the topic "Integrated magnetics"

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Muradali, Chen, and Lunt. L52191 Effectiveness of New Prevention Technologies for Mechanical Damage. Pipeline Research Council International, Inc. (PRCI), 2003. http://dx.doi.org/10.55274/r0011318.

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The objective of the project was to review and evaluate new technologies for protecting pipelines from third-party damage. The evaluation focused on the effectiveness, technical feasibility, cost and availability of technologies that show the most potential for reducing hits to pipelines. The three technologies reviewed in detail were Integrated Buried Markers, which consists of electronic markers and marker tapes; Advanced One-Call Systems, which incorporate GIS-based mapping, electronic ticket management, and web-based access to one-call centers; and the Magnetic Gradiometer, which is a locating technology. Advanced One-Call Systems was found to be the most effective with an estimated reduction to pipeline hit frequencies by 36%. This is followed by Integrated Buried Markers, which are estimated to reduce pipeline hits by about 30%. The Magnetic Gradiometer is estimated to reduce pipeline hits by about 12%. With the exception of the Magnetic Gradiometer, which is in its early development stage, all technologies are commercially available. A cost-benefit analysis revealed that benefits for both Advanced One-Call Systems and the Magnetic Gradiometer outweigh the costs. Integrated Buried Markers were shown to be cost effective for new pipeline constructions in populated regions. Otherwise, the economic advantage is affected by the installation costs.
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Cerfon, Antoine, Geoffrey McFadden, Jon Wilkening, et al. High Performance Equilibrium Solvers for Integrated Magnetic Fusion Simulations. Office of Scientific and Technical Information (OSTI), 2022. http://dx.doi.org/10.2172/1856740.

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Hayward, N., and V. Tschirhart. A comparison of 3-D inversion strategies in the investigation of the 3-D density and magnetic susceptibility distribution in the Great Bear Magmatic Zone, Northwest Territories. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/331954.

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The inversion of new compilations of aeromagnetic data and gravity data are employed to investigate the 3-D physical property (magnetic susceptibility and density) distribution within the Great Bear magmatic zone. The application of two different software suites (Geosoft VOXI and UBC GIF MAG3D and GRAV3D) affords a comparison of approaches and results. The magnetic susceptibility results are broadly compatible, but Geosoft VOXI enabled more detailed definition of shallow sources. The density results were markedly different in how the model responded to the low-resolution gravity data in characterization of the near-surface. GRAV3D extrapolated shallow sources to surface, whereas Geosoft VOXI smoothed and closed the top of shallow sources below surface. The different magnetic susceptibility and density models can be used to assess the physical property distribution and relationships across the region. One approach, applied here, is to combine the near-surface magnetic susceptibility and density results to identify zones of coincidently high physical properties, a common physical proper relationship associated with IOCG mineral deposits. These integrated models highlight many of the region's known mineral occurrences and reveal other zones for further analysis.
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Cohen, B. I., E. B. Hooper, T. R. Jarboe, et al. Integrated simulation and modeling capability for alternate magnetic fusion concepts. Office of Scientific and Technical Information (OSTI), 1998. http://dx.doi.org/10.2172/2810.

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Keating, Kristina, Lee Slater, Dimitris Ntarlagiannis, and Kenneth H. Williams. Integrated Geophysical Measurements for Bioremediation Monitoring: Combining Spectral Induced Polarization, Nuclear Magnetic Resonance and Magnetic Methods. Office of Scientific and Technical Information (OSTI), 2015. http://dx.doi.org/10.2172/1170616.

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Kong, J. A. Theoretical Analysis of Microwave and Millimeter Wave Integrated Circuits Based on Magnetic Films. Defense Technical Information Center, 1992. http://dx.doi.org/10.21236/ada257512.

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Kong, J. A. Theoretical Analysis of Microwave and Millimeter Wave Integrated Circuits Based on Magnetic Films. Defense Technical Information Center, 1990. http://dx.doi.org/10.21236/ada229746.

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Barnes, B. L41025A PRCI Research Results on In-Line Inspection Technology Field Tests - Expanded. Pipeline Research Council International, Inc. (PRCI), 1988. http://dx.doi.org/10.55274/r0011372.

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This report will briefly describe the performance of eddy current and magnetic flux leakage systems and the difficulties that have been recognized as impediments for stress corrosion crack detection on ILI vehicles. In addition, two promising systems, based on electromagnetic acoustic transducers (EMAT's) and piezoelectrics (elastic waves), have emerged from the PRCI research efforts. Results of field testing in Casa Grande, Arizona on an El Paso Natural Gas abandoned pipeline using these systems will be summarized and will show the state of development of both EMAT's and piezoelectrics (elastic waves) in detecting SCC in pipelines when integrated with an ILI inspection vehicle. Expanded from the public version to include additional data and details.
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Parra, Jorge O., Chris L. Hackert, Hughbert A. Collier, and Michael Bennett. A Methodology to Integrate Magnetic Resonance and Acoustic Measurements for Reservoir Characterization. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/790861.

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Parra, Ph D. ,. Jorge O. A Methodology to Integrate Magnetic Resonance and Acoustic Measurements for Reservoir Characterization. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/795220.

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