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Power converters are widely used over the world and are implemented in several electronic applications. This thesis was realised in partnership with CE+T POWER, one of the leaders on the power management market. The principal goal of this project was to revise their current DC/DC converter implemented inside one of their main products, the ``Sierra 10". To do so, the idea of replacing MOSFET by new GaN transistors was investigated.

First, the converter operations were studied and successfully checked on LTspice simulations. The wide bandgap semiconductors technology was summarised and it was shown that there were several advantages of using GaN instead of silicon transistors. GaN transistors are easy to use, allow new capabilities, are reliable, and will be at least as cost-effective as the silicon within few years.

Then, it was shown that the transistors of the converter were controllable by sensing the magnetising current. In practice, the drain current of the primary transistor is almost an image of the magnetising current (without considering the resonance part of the drain current). The drain current would be sensed. It was possible to fix the needed output power to compute the corresponding peak magnetising current values and switching frequency to impose. At first glance, there were several operating points for a given output power. However, it was shown, under assumptions, that an operating point which induces the lowest power losses inside the primary transistor existed. This could be translated into a simple optimisation problem. The mathematical programming results corresponded to the analytical results. The model suggested to decrease the switching frequency around 30 kHz for a peak magnetising current of 81 A. This operating point might not be the most practical one in terms of transformer sizing and cost. Supplementary manufacturing constraints could be added to the model to shift the minimum losses operating point.

The obtained results showed that a possible minimum losses operating point exists and could be tracked under a simple model of losses computation that could be sharpened in function of the technical constraints.

wide bandgap semiconductor --- GaN --- dc/dc converter --- power electronics --- power converter --- MOSFET --- Ingénierie, informatique & technologie > Ingénierie électrique & électronique

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Nowadays, power electronics is an enabling technology in the energy development scenario. Furthermore, power electronics is strictly linked with several fields of technological growth, such as consumer electronics, IT and communications, electrical networks, utilities, industrial drives and robotics, and transportation and automotive sectors. Moreover, the widespread use of power electronics enables cost savings and minimization of losses in several technology applications required for sustainable economic growth. The topologies of DC–DC power converters and switching converters are under continuous development and deserve special attention to highlight the advantages and disadvantages for use increasingly oriented towards green and sustainable development. DC–DC converter topologies are developed in consideration of higher efficiency, reliable control switching strategies, and fault-tolerant configurations. Several types of switching converter topologies are involved in isolated DC–DC converter and nonisolated DC–DC converter solutions operating in hard-switching and soft-switching conditions. Switching converters have applications in a broad range of areas in both low and high power densities. The articles presented in the Special Issue titled "Advanced DC-DC Power Converters and Switching Converters" consolidate the work on the investigation of the switching converter topology considering the technological advances offered by innovative wide-bandgap devices and performance optimization methods in control strategies used.

History of engineering & technology --- interleaved operation --- three-winding coupled inductor --- high step-up DC–DC converter --- DC/DC converter --- multi-input-port --- bidirectional --- energy storage --- three-phase bidirectional isolated DC-DC converter --- burst-mode switching --- high-frequency transformer configurations --- phase-shift modulation --- intermittent switching --- three-phase dual-active bridge --- bidirectional converter --- high efficiency --- GaN --- SiC --- buck-boost converter --- high switching frequency --- electric vehicle (EV) --- fast charging --- interleaved dc–dc converter --- SiC devices --- Si devices --- Component Connection Method --- power electronics-based systems --- stability analysis --- state-space methods --- virtual synchronous generators --- DC-DC converters --- photovoltaics --- single-diode model --- state-space --- multi-port dual-active bridge (DAB) converter --- wide-band-gap (WBG) semiconductors --- silicon carbide (SiC) MOSFETs --- power converter --- automotive --- battery charger --- circuit modelling --- power electronics --- SiC MOSFET

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In this book, nine papers focusing on different fields of power electronics are gathered, all of which are in line with the present trends in research and industry. Given the generality of the Special Issue, the covered topics range from electrothermal models and losses models in semiconductors and magnetics to converters used in high-power applications. In this last case, the papers address specific problems such as the distortion due to zero-current detection or fault investigation using the fast Fourier transform, all being focused on analyzing the topologies of high-power high-density applications, such as the dual active bridge or the H-bridge multilevel inverter. All the papers provide enough insight in the analyzed issues to be used as the starting point of any research. Experimental or simulation results are presented to validate and help with the understanding of the proposed ideas. To summarize, this book will help the reader to solve specific problems in industrial equipment or to increase their knowledge in specific fields.

soft-switching --- Superjunction MOSFET --- LLC resonant converter --- zero voltage switching --- COSS hysteresis --- COSS intrinsic energy losses --- SiC devices --- antiparallel diode --- dual active bridge --- power electronic transformer --- high-frequency transformer --- Artificial Neural Networks (ANN) --- fault diagnosis --- Fast Fourier Transform (FFT) --- Multilevel Inverter (MLI) --- LabVIEW --- magnetics modeling --- variable inductor --- hysteresis --- eddy currents --- saturable core --- AC/AC conversion --- decoupling control --- modulation --- DC–DC converter --- phase shift PWM --- ZVS --- inrush current --- MOSFET --- telecom server --- modular multilevel converter (MMC) --- total harmonic distortion (THD) --- universal mathematical model (UMM) --- switching state --- nearest level modulation (NLM) --- DC-DC converter --- IGBT --- averaged model --- electrothermal model --- SPICE --- power electronics --- converter control --- power factor correction --- total harmonic distortion --- flyback --- solid-state lighting

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In this book, nine papers focusing on different fields of power electronics are gathered, all of which are in line with the present trends in research and industry. Given the generality of the Special Issue, the covered topics range from electrothermal models and losses models in semiconductors and magnetics to converters used in high-power applications. In this last case, the papers address specific problems such as the distortion due to zero-current detection or fault investigation using the fast Fourier transform, all being focused on analyzing the topologies of high-power high-density applications, such as the dual active bridge or the H-bridge multilevel inverter. All the papers provide enough insight in the analyzed issues to be used as the starting point of any research. Experimental or simulation results are presented to validate and help with the understanding of the proposed ideas. To summarize, this book will help the reader to solve specific problems in industrial equipment or to increase their knowledge in specific fields.

Technology: general issues --- soft-switching --- Superjunction MOSFET --- LLC resonant converter --- zero voltage switching --- COSS hysteresis --- COSS intrinsic energy losses --- SiC devices --- antiparallel diode --- dual active bridge --- power electronic transformer --- high-frequency transformer --- Artificial Neural Networks (ANN) --- fault diagnosis --- Fast Fourier Transform (FFT) --- Multilevel Inverter (MLI) --- LabVIEW --- magnetics modeling --- variable inductor --- hysteresis --- eddy currents --- saturable core --- AC/AC conversion --- decoupling control --- modulation --- DC–DC converter --- phase shift PWM --- ZVS --- inrush current --- MOSFET --- telecom server --- modular multilevel converter (MMC) --- total harmonic distortion (THD) --- universal mathematical model (UMM) --- switching state --- nearest level modulation (NLM) --- DC-DC converter --- IGBT --- averaged model --- electrothermal model --- SPICE --- power electronics --- converter control --- power factor correction --- total harmonic distortion --- flyback --- solid-state lighting --- soft-switching --- Superjunction MOSFET --- LLC resonant converter --- zero voltage switching --- COSS hysteresis --- COSS intrinsic energy losses --- SiC devices --- antiparallel diode --- dual active bridge --- power electronic transformer --- high-frequency transformer --- Artificial Neural Networks (ANN) --- fault diagnosis --- Fast Fourier Transform (FFT) --- Multilevel Inverter (MLI) --- LabVIEW --- magnetics modeling --- variable inductor --- hysteresis --- eddy currents --- saturable core --- AC/AC conversion --- decoupling control --- modulation --- DC–DC converter --- phase shift PWM --- ZVS --- inrush current --- MOSFET --- telecom server --- modular multilevel converter (MMC) --- total harmonic distortion (THD) --- universal mathematical model (UMM) --- switching state --- nearest level modulation (NLM) --- DC-DC converter --- IGBT --- averaged model --- electrothermal model --- SPICE --- power electronics --- converter control --- power factor correction --- total harmonic distortion --- flyback --- solid-state lighting

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• Reference Manager
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In this book, nine papers focusing on different fields of power electronics are gathered, all of which are in line with the present trends in research and industry. Given the generality of the Special Issue, the covered topics range from electrothermal models and losses models in semiconductors and magnetics to converters used in high-power applications. In this last case, the papers address specific problems such as the distortion due to zero-current detection or fault investigation using the fast Fourier transform, all being focused on analyzing the topologies of high-power high-density applications, such as the dual active bridge or the H-bridge multilevel inverter. All the papers provide enough insight in the analyzed issues to be used as the starting point of any research. Experimental or simulation results are presented to validate and help with the understanding of the proposed ideas. To summarize, this book will help the reader to solve specific problems in industrial equipment or to increase their knowledge in specific fields.

Technology: general issues --- soft-switching --- Superjunction MOSFET --- LLC resonant converter --- zero voltage switching --- COSS hysteresis --- COSS intrinsic energy losses --- SiC devices --- antiparallel diode --- dual active bridge --- power electronic transformer --- high-frequency transformer --- Artificial Neural Networks (ANN) --- fault diagnosis --- Fast Fourier Transform (FFT) --- Multilevel Inverter (MLI) --- LabVIEW --- magnetics modeling --- variable inductor --- hysteresis --- eddy currents --- saturable core --- AC/AC conversion --- decoupling control --- modulation --- DC–DC converter --- phase shift PWM --- ZVS --- inrush current --- MOSFET --- telecom server --- modular multilevel converter (MMC) --- total harmonic distortion (THD) --- universal mathematical model (UMM) --- switching state --- nearest level modulation (NLM) --- DC-DC converter --- IGBT --- averaged model --- electrothermal model --- SPICE --- power electronics --- converter control --- power factor correction --- total harmonic distortion --- flyback --- solid-state lighting