EPE Association: EPE 2020 - LS5a : DC/DC Converter Design

EPE 2020 - LS5a : DC/DC Converter Design
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 02: Power Converter Topologies and Design > EPE 2020 - LS5a : DC/DC Converter Design

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   Capacitor Size Comparison on High-Power DC-DC Converters with Different Transformer Winding Configurations on the AC-link
By Babak KHANZADEH [View]
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Abstract: This paper compares the capacitor requirement of the modular multi-level converter based dual-active-bridge (MMC-DAB) and the controlled transition bridge based dual-active-bridge (CTB-DAB) DC-DC converters. Three winding configurations, namely YY, DD, and YD, are considered for the AC-link's medium-frequency transformer (MFT). It is shown that for a specific inverter topology (i.e., MMC or CTB), the YY and DD connections of the MFT results in identical energy storage requirements for the converters. Moreover, it is demonstrated that the YD connection reduces the capacitor requirements of the converters considerably. In the best case, the capacitor requirement can be reduced for the MMC-DAB and the CTB-DAB by 30\% and 40\%, respectively. A comparison between the converters showed that the YY-connected MMC-DAB (the YD-connected CTB-DAB) has the highest (the lowest) energy storage requirement. Additionally, it is shown that the YD-connected CTB-DAB can achieve up to 78\% (58\%) less energy storage compared to the YY-connected MMC-DAB in the best case (worst case).

   Design and optimization of high-efficiency 1W 500V-12V isolated low-cost DC/DC converter
By Etienne FORAY [View]
[Download]

Abstract: Conversion from high-input-voltage to low-output-voltage in low-power mode is challenging, especially with high-efficiency and small-size requirements. Standard Flyback solutions are not good enough for these applications. This works analyzes the design trends for a low-power Asymmetrical Half-Bridge Flyback, with special attention given to the power-stage and transformer design. A simplified model of the converter is built to compare a large number of solutions and to validate the design approach. Results from the model are analyzed, through the study of some key parameters and some interesting designs are identified. They show the benefits of this approach with respect to existing solutions, based on standard Flyback.

   Design of a Wide Input Voltage Range Current-Fed DC/DC Converter Within a Reduced Duty-Cycle Range
By Michael GERSTNER [View]
[Download]

Abstract: A design of a current-fed push-pull converter for wide input voltage ranges within a reduced duty-cycle range is presented. Based on the converter conversion ratios of three different clamping on_gurations, the potential of the input clamping is shown analytical, simulative and by measurements. A differentiation is made between the four possible operating modes, which can be distinguished in the control of the semiconductors and the magnetomotive force in the reactor. By optimizing the turn ratios of both transformers, the wide input voltage range capability of the input clamped current-fed push-pull converter was improved, which has been proved by measurements on a real prototype.

   High-Frequency SiC-Based Medium Voltage Quasi-2-Level Flying Capacitor DC/DC Converter With Zero Voltage Switching
By Rafal KOPACZ [View]
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Abstract: This paper presents a medium voltage (1.5 kV) flying capacitor DC/DC converter rated at 30 kW. Thefast switching 1.2 kV/11 mO SiC MOSFETs converter operates in quasi-2-level (Q2L) mode at highfrequency (100 kHz) to obtain a low size of the flying capacitor (330 nF). Moreover, a novel switchingpattern is introduced and ZVS at turn-on is also enabled. Such control method leads to lower switching losses, higher switching frequency and minimized inductor volume compared to more conventional topologies. Presented experimental results prove correct operation of the proposed converter and control method.

EPE 2020 - LS5a : DC/DC Converter Design
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 02: Power Converter Topologies and Design > EPE 2020 - LS5a : DC/DC Converter Design
	[return to parent folder]

	Capacitor Size Comparison on High-Power DC-DC Converters with Different Transformer Winding Configurations on the AC-link By Babak KHANZADEH	[View] [Download]
Abstract: This paper compares the capacitor requirement of the modular multi-level converter based dual-active-bridge (MMC-DAB) and the controlled transition bridge based dual-active-bridge (CTB-DAB) DC-DC converters. Three winding configurations, namely YY, DD, and YD, are considered for the AC-link's medium-frequency transformer (MFT). It is shown that for a specific inverter topology (i.e., MMC or CTB), the YY and DD connections of the MFT results in identical energy storage requirements for the converters. Moreover, it is demonstrated that the YD connection reduces the capacitor requirements of the converters considerably. In the best case, the capacitor requirement can be reduced for the MMC-DAB and the CTB-DAB by 30\% and 40\%, respectively. A comparison between the converters showed that the YY-connected MMC-DAB (the YD-connected CTB-DAB) has the highest (the lowest) energy storage requirement. Additionally, it is shown that the YD-connected CTB-DAB can achieve up to 78\% (58\%) less energy storage compared to the YY-connected MMC-DAB in the best case (worst case).

	Design and optimization of high-efficiency 1W 500V-12V isolated low-cost DC/DC converter By Etienne FORAY	[View] [Download]
Abstract: Conversion from high-input-voltage to low-output-voltage in low-power mode is challenging, especially with high-efficiency and small-size requirements. Standard Flyback solutions are not good enough for these applications. This works analyzes the design trends for a low-power Asymmetrical Half-Bridge Flyback, with special attention given to the power-stage and transformer design. A simplified model of the converter is built to compare a large number of solutions and to validate the design approach. Results from the model are analyzed, through the study of some key parameters and some interesting designs are identified. They show the benefits of this approach with respect to existing solutions, based on standard Flyback.

	Design of a Wide Input Voltage Range Current-Fed DC/DC Converter Within a Reduced Duty-Cycle Range By Michael GERSTNER	[View] [Download]
Abstract: A design of a current-fed push-pull converter for wide input voltage ranges within a reduced duty-cycle range is presented. Based on the converter conversion ratios of three different clamping on_gurations, the potential of the input clamping is shown analytical, simulative and by measurements. A differentiation is made between the four possible operating modes, which can be distinguished in the control of the semiconductors and the magnetomotive force in the reactor. By optimizing the turn ratios of both transformers, the wide input voltage range capability of the input clamped current-fed push-pull converter was improved, which has been proved by measurements on a real prototype.

	High-Frequency SiC-Based Medium Voltage Quasi-2-Level Flying Capacitor DC/DC Converter With Zero Voltage Switching By Rafal KOPACZ	[View] [Download]
Abstract: This paper presents a medium voltage (1.5 kV) flying capacitor DC/DC converter rated at 30 kW. Thefast switching 1.2 kV/11 mO SiC MOSFETs converter operates in quasi-2-level (Q2L) mode at highfrequency (100 kHz) to obtain a low size of the flying capacitor (330 nF). Moreover, a novel switchingpattern is introduced and ZVS at turn-on is also enabled. Such control method leads to lower switching losses, higher switching frequency and minimized inductor volume compared to more conventional topologies. Presented experimental results prove correct operation of the proposed converter and control method.