EPE Association: EPE 2020 - LS5e: Power Supplies

EPE 2020 - LS5e: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 07: Power Supplies > EPE 2020 - LS5e: Power Supplies

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   A High Performance 48-to-8 V Multi-Resonant Switched-Capacitor Converter for Data Center Applications
By Rose ABRAMSON [View]
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Abstract: Resonant switched-capacitor (SC) converters are becoming increasingly attractive for high performance applications due to their efficient utilization of switches and use of high energy density capacitors. Multiphase SC converters can offer further improvements in performance, as they can achieve the same conversion ratio as traditional two-phase SC converters with fewer capacitors and switches, making them ideal for large conversion ratio applications. This paper presents theoretical analysis and experimental results for a resonant multi-phase SC converter comprising a cascaded series-parallel topology derived from the conventional 4-to-1 series-parallel converter. The proposed converter can achieve a 6-to-1 conversion ratio with the same number of switches and capacitors as the 4-to-1 series-parallel converter. A 48-to-8 V prototype designed for data center applications was built and tested with 40 A maximum output current. The prototype achieved 99.0\% peak efficiency (98.5\% including gate drive loss) and 2230 W/in3 power density, demonstrating one of the best in-class performances.

   A High-Efficiency Wireless Power Transfer System for Unmanned Aerial Vehicle Considering Carbon Fiber Body
By KAI SONG [View]
[Download]

Abstract: The application of wireless power transfer in the unmanned aerial vehicles (UAV) is becoming more and more extensive. In order to meet the requirements of miniaturization and lightweight, the fuselage of UAV often uses carbon fiber materials and the influence on the magnetic field distribution and energy transmission cannot be ignored. In this paper, the eddy current loss of the carbon fiber fuselage is simulated and analyzed, and the effect of the aluminum shielding method is studied. The study found that by optimizing the parameters such as the size, thickness and position of the shielded aluminum ring, the total system loss will be better improved, and the weight is light, which will not affect flight. Finally, a 500 W prototype is established to validate the method.

   Analysis of the transformer modularization for the high frequency isolated high voltage generator
By Saijun MAO [View]
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Abstract: This paper investigates the analysis of the transformer modularization structure for the high frequency isolated high voltage (HV) generator with silicon carbide (SiC) devices. The modularization of the HV transformers provide advantages such as low insulation stress, low dielectric loss, distributed thermal stress and size reduction at high frequency without any sacrifice to the efficiency for the HV generator. The equivalent circuit diagram is derived to better describe the characteristics of the modular transformer architectures. Finally, a 300kHz, 8kW 160kV output voltage HV generator prototype with 1.2kV SiC MOSFETs for the inverter and 1.2kV SiC Schottky diodes for the voltage multiplier is built as a technology demonstrator to validate the proposed transformer modularization concept.

   Power Supply Design Considerations For 400Hz Aircraft Applications
By Bilal AHMAD [View]
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Abstract: In this study a 5kW power supply for aircraft applications has been designed. Boost type power factor correction topology Delta rectifier complies with military standards of conducted emissions and is selected as a front-end rectifier for 400 Hz mains power supply. For isolation and output Dc voltage regulation a full bridge Dc-Dc converter with 99\% efficient high frequency transformer has been designed.

EPE 2020 - LS5e: Power Supplies
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 07: Power Supplies > EPE 2020 - LS5e: Power Supplies
	[return to parent folder]

	A High Performance 48-to-8 V Multi-Resonant Switched-Capacitor Converter for Data Center Applications By Rose ABRAMSON	[View] [Download]
Abstract: Resonant switched-capacitor (SC) converters are becoming increasingly attractive for high performance applications due to their efficient utilization of switches and use of high energy density capacitors. Multiphase SC converters can offer further improvements in performance, as they can achieve the same conversion ratio as traditional two-phase SC converters with fewer capacitors and switches, making them ideal for large conversion ratio applications. This paper presents theoretical analysis and experimental results for a resonant multi-phase SC converter comprising a cascaded series-parallel topology derived from the conventional 4-to-1 series-parallel converter. The proposed converter can achieve a 6-to-1 conversion ratio with the same number of switches and capacitors as the 4-to-1 series-parallel converter. A 48-to-8 V prototype designed for data center applications was built and tested with 40 A maximum output current. The prototype achieved 99.0\% peak efficiency (98.5\% including gate drive loss) and 2230 W/in3 power density, demonstrating one of the best in-class performances.

	A High-Efficiency Wireless Power Transfer System for Unmanned Aerial Vehicle Considering Carbon Fiber Body By KAI SONG	[View] [Download]
Abstract: The application of wireless power transfer in the unmanned aerial vehicles (UAV) is becoming more and more extensive. In order to meet the requirements of miniaturization and lightweight, the fuselage of UAV often uses carbon fiber materials and the influence on the magnetic field distribution and energy transmission cannot be ignored. In this paper, the eddy current loss of the carbon fiber fuselage is simulated and analyzed, and the effect of the aluminum shielding method is studied. The study found that by optimizing the parameters such as the size, thickness and position of the shielded aluminum ring, the total system loss will be better improved, and the weight is light, which will not affect flight. Finally, a 500 W prototype is established to validate the method.

	Analysis of the transformer modularization for the high frequency isolated high voltage generator By Saijun MAO	[View] [Download]
Abstract: This paper investigates the analysis of the transformer modularization structure for the high frequency isolated high voltage (HV) generator with silicon carbide (SiC) devices. The modularization of the HV transformers provide advantages such as low insulation stress, low dielectric loss, distributed thermal stress and size reduction at high frequency without any sacrifice to the efficiency for the HV generator. The equivalent circuit diagram is derived to better describe the characteristics of the modular transformer architectures. Finally, a 300kHz, 8kW 160kV output voltage HV generator prototype with 1.2kV SiC MOSFETs for the inverter and 1.2kV SiC Schottky diodes for the voltage multiplier is built as a technology demonstrator to validate the proposed transformer modularization concept.

	Power Supply Design Considerations For 400Hz Aircraft Applications By Bilal AHMAD	[View] [Download]
Abstract: In this study a 5kW power supply for aircraft applications has been designed. Boost type power factor correction topology Delta rectifier complies with military standards of conducted emissions and is selected as a front-end rectifier for 400 Hz mains power supply. For isolation and output Dc voltage regulation a full bridge Dc-Dc converter with 99\% efficient high frequency transformer has been designed.