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Wide Range DC-DC Power Conversion Systems - Architectures, Circuits and Components.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Wide Range DC-DC Power Conversion Systems - Architectures, Circuits and Components./
作者:	Mukherjee, Satyaki.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	278 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-03, Section: B.
Contained By:	Dissertations Abstracts International83-03B.
標題:	Electrical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28645737
ISBN:	9798538119813

Wide Range DC-DC Power Conversion Systems - Architectures, Circuits and Components.
Mukherjee, Satyaki.

Wide Range DC-DC Power Conversion Systems - Architectures, Circuits and Components. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 278 p.

Source: Dissertations Abstracts International, Volume: 83-03, Section: B.

Thesis (Ph.D.)--University of Colorado at Boulder, 2021.

This item must not be sold to any third party vendors.

Wide Range DC-DC power conversion find their application in a wide variety of power conditioning environments, ranging from automotive LED drivers -- to bus converters used in data centers -- to integration of renewable energy with the utility grid. While it has been well established that fixed conversion ratio DC-DC converters are capable of operating with extremely high efficiency and power density, addressing wide variation in input voltage or output power still remains unexplored. This thesis identifies several application examples where wide range operation is prevalent and offers solutions capable of operating efficiently over the system's entire operating range.One such application example where wide input voltage, output voltage and output current operation is required is an automotive LED driver. First, using a 2 MHz immittance resonant converter as an automotive LED driver, driven from a fixed 12V input voltage and supplying regulated 0.5A current, a peak efficiency of 93% is achieved with >86% efficiency maintained across an output voltage range of 3V to 36V. Thereafter, problems associated with simple immittance networks when operated with wide input voltage and output current variation are identified and a novel wide range resonant network derived from the basic immittance resonant tank is proposed to circumvent the identified deficiencies. With a control technique devised to minimize the circulating currents in the resonant tank while maintaining soft switching, the proposed converter achieves a peak power stage efficiency of 92.4% and operates with >85% efficiency across the entire input voltage range of 8V to 18V and output voltage range of 10V to 40V using similar active and passive area as the basic LCL-T immittance-network converter. Next, a multiple output two stage automotive LED driver architecture is proposed using a multi-phase non-inverting buck-boost front end stage and LCL-T immittance-network based output current regulation stages. This approach addresses the input voltage variation by using the front-end to provide a regulated input voltage to the resonant networks. For a four-output 120W prototype with 250kHz front-end and 2MHz resonant stages, the measured power stage efficiency is above 88% over wide input (8-18,V) and output (3-50V) voltage ranges, with a peak efficiency of 92.1% at the nominal battery voltage of 13V. Further, a new design methodology is proposed to enhance efficiency of higher-order immittance-network based resonant converters based on the principle of minimizing inductive energy storage. This design methodology is experimentally demonstrated for a 20V input to 5V, 9V and 15V output USB-C battery charger delivering 6$A output current while switching at 1MHz. The proposed design methodology achieves a peak efficiency of 92% and has more than 10% lower losses compared to a conventionally designed prototype. Next, a transformerless composite converter architecture is proposed and applied for a wide input voltage range intermediate bus converter in an AC to low voltage DC power conversion architecture, providing greater than 4-to-1 step down ratio. While driven from 48V to 65V input and delivering a regulated 12V, 10A output, this architecture is shown to achieve a peak efficiency of 97.9% and to maintain greater than 96% efficiency across the entire input voltage and output power range. The remainder of the thesis focuses on design techniques for high-frequency planar magnetic components, which are critical in all aforementioned applications. First, a simple orthogonal-gap technique is proposed to reduce effects of fringing magnetic fields on ac winding losses in high-frequency inductors. As a case study, a planar inductor is designed for an 8kW SiC-based buck converter operating at 250kHz. 3D FEM simulations along with experimental results are provided to compare the proposed air-gap arrangement with the existing solutions. It is shown that approximately 50% reduction in ac winding losses is achieved using the orthogonal air gaps compared to a conventional design. This approach is then extended to converters deploying coupled inductors to achieve several system level advantages. An application of orthogonal airgaps in an AC coupled inductor demonstrated 13% overall loss reduction compared to a system using conventionally gapped coupled inductors. In the final chapter of the thesis, the design of a high-frequency planar transformer suitable for direct low-voltage to medium-voltage (MV) is presented. The transformer is expected to withstand medium voltage (10's of KV) isolation between its primary and secondary terminals. Using a Hipot tester, it is shown how a 14-layer, 30:30 turn, 2oz planar transformer withstands 26kV between the primary and the secondary and between the windings and the grounded core segments. The high-frequency operation of the transformer is experimentally demonstrated in a prototype dc to three-phase ac module processing 7.5kW power with 97% efficiency.

ISBN: 9798538119813Subjects--Topical Terms:

649834
Electrical engineering.
Subjects--Index Terms:

High frequency magnetics design

Wide Range DC-DC Power Conversion Systems - Architectures, Circuits and Components.
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500 $a Source: Dissertations Abstracts International, Volume: 83-03, Section: B.
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502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 2021.
506 $a This item must not be sold to any third party vendors.
520 $a Wide Range DC-DC power conversion find their application in a wide variety of power conditioning environments, ranging from automotive LED drivers -- to bus converters used in data centers -- to integration of renewable energy with the utility grid. While it has been well established that fixed conversion ratio DC-DC converters are capable of operating with extremely high efficiency and power density, addressing wide variation in input voltage or output power still remains unexplored. This thesis identifies several application examples where wide range operation is prevalent and offers solutions capable of operating efficiently over the system's entire operating range.One such application example where wide input voltage, output voltage and output current operation is required is an automotive LED driver. First, using a 2 MHz immittance resonant converter as an automotive LED driver, driven from a fixed 12V input voltage and supplying regulated 0.5A current, a peak efficiency of 93% is achieved with >86% efficiency maintained across an output voltage range of 3V to 36V. Thereafter, problems associated with simple immittance networks when operated with wide input voltage and output current variation are identified and a novel wide range resonant network derived from the basic immittance resonant tank is proposed to circumvent the identified deficiencies. With a control technique devised to minimize the circulating currents in the resonant tank while maintaining soft switching, the proposed converter achieves a peak power stage efficiency of 92.4% and operates with >85% efficiency across the entire input voltage range of 8V to 18V and output voltage range of 10V to 40V using similar active and passive area as the basic LCL-T immittance-network converter. Next, a multiple output two stage automotive LED driver architecture is proposed using a multi-phase non-inverting buck-boost front end stage and LCL-T immittance-network based output current regulation stages. This approach addresses the input voltage variation by using the front-end to provide a regulated input voltage to the resonant networks. For a four-output 120W prototype with 250kHz front-end and 2MHz resonant stages, the measured power stage efficiency is above 88% over wide input (8-18,V) and output (3-50V) voltage ranges, with a peak efficiency of 92.1% at the nominal battery voltage of 13V. Further, a new design methodology is proposed to enhance efficiency of higher-order immittance-network based resonant converters based on the principle of minimizing inductive energy storage. This design methodology is experimentally demonstrated for a 20V input to 5V, 9V and 15V output USB-C battery charger delivering 6$A output current while switching at 1MHz. The proposed design methodology achieves a peak efficiency of 92% and has more than 10% lower losses compared to a conventionally designed prototype. Next, a transformerless composite converter architecture is proposed and applied for a wide input voltage range intermediate bus converter in an AC to low voltage DC power conversion architecture, providing greater than 4-to-1 step down ratio. While driven from 48V to 65V input and delivering a regulated 12V, 10A output, this architecture is shown to achieve a peak efficiency of 97.9% and to maintain greater than 96% efficiency across the entire input voltage and output power range. The remainder of the thesis focuses on design techniques for high-frequency planar magnetic components, which are critical in all aforementioned applications. First, a simple orthogonal-gap technique is proposed to reduce effects of fringing magnetic fields on ac winding losses in high-frequency inductors. As a case study, a planar inductor is designed for an 8kW SiC-based buck converter operating at 250kHz. 3D FEM simulations along with experimental results are provided to compare the proposed air-gap arrangement with the existing solutions. It is shown that approximately 50% reduction in ac winding losses is achieved using the orthogonal air gaps compared to a conventional design. This approach is then extended to converters deploying coupled inductors to achieve several system level advantages. An application of orthogonal airgaps in an AC coupled inductor demonstrated 13% overall loss reduction compared to a system using conventionally gapped coupled inductors. In the final chapter of the thesis, the design of a high-frequency planar transformer suitable for direct low-voltage to medium-voltage (MV) is presented. The transformer is expected to withstand medium voltage (10's of KV) isolation between its primary and secondary terminals. Using a Hipot tester, it is shown how a 14-layer, 30:30 turn, 2oz planar transformer withstands 26kV between the primary and the secondary and between the windings and the grounded core segments. The high-frequency operation of the transformer is experimentally demonstrated in a prototype dc to three-phase ac module processing 7.5kW power with 97% efficiency.
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650 4 $a Electrical engineering. $3 649834
650 4 $a Electromagnetics. $3 3173223
650 4 $a Energy. $3 876794
653 $a High frequency magnetics design
653 $a Immittance networks
653 $a Medium voltage isolation
653 $a Power electronics
653 $a Resonant DC-DC converters
653 $a Wide range DC-DC systems
690 $a 0544
690 $a 0607
690 $a 0791
710 2 $a University of Colorado at Boulder. $b Electrical Engineering. $3 1025672
773 0 $t Dissertations Abstracts International $g 83-03B.
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791 $a Ph.D.
792 $a 2021
793 $a English
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