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A Study of Two Multi-Element Resonant DC-DC Topologies with Loss Distribution Analyses

1,†, 1,*,†, 1,†, 2 and 3
School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China
State Grid Jiangxi Electric Power Company Repair Branch, Nanchang 330000, China
State Grid Nanjing Power Supply Company, Nanjing 210000, China
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Energies 2017, 10(9), 1400;
Received: 17 August 2017 / Revised: 8 September 2017 / Accepted: 12 September 2017 / Published: 13 September 2017
PDF [7537 KB, uploaded 22 September 2017]


In this paper, two multi-element resonant DC-DC converters are analyzed in detail. Since their resonant tanks have multiple resonant components, the converters display different resonant characteristics within different operating frequency ranges. Through appropriate design, both of the two proposed converters successfully lower the conversion losses and, meanwhile, broaden the voltage gain ranges as well: one converter is able to take full usage of the third order harmonic to deliver the active power, and thus the effective utilization rate of the resonant current is elevated; while the another minimizes the entire switching losses for power switching devices by restricting the input impedance angle of the resonant tank. Besides, the loss distribution is analyzed for the purpose of guiding the component design. In the end, two 500 W prototypes are fabricated to test the theoretical analyses. The results demonstrate that the two proposed converters can achieve wide voltage gain with the small frequency deviation, which noticeably contributes to highly efficient conversion. Their peak efficiencies are measured as 95.4% and 95.3%, respectively. View Full-Text
Keywords: resonant DC-DC converter; multi-element; loss distribution; efficiency; soft switching resonant DC-DC converter; multi-element; loss distribution; efficiency; soft switching

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Wang, Y.; Yang, L.; Han, F.; Tu, S.; Zhang, W. A Study of Two Multi-Element Resonant DC-DC Topologies with Loss Distribution Analyses. Energies 2017, 10, 1400.

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