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SHI Hongbo,WU Xinke,GUO Qing.High-efficiency High-power-density Series Resonant DC-DC Converter Based on Low-voltage Device[J].JOURNAL OF POWER SUPPLY,2021,19(2):8-14
High-efficiency High-power-density Series Resonant DC-DC Converter Based on Low-voltage Device
Received:January 28, 2019  Revised:February 05, 2021
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DOI:10.13234/j.issn.2095-2805.2021.2.8
Keywords:MHz switching frequency  series resonant converter  input-series output-parallel (ISOP)  zero-voltage swi-tching (ZVS)
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SHI Hongbo College of Electrical Engineering, Zhejiang University, Hangzhou , China
WU Xinke College of Electrical Engineering, Zhejiang University, Hangzhou , China wuxinke@zju.edu.cn
GUO Qing College of Electrical Engineering, Zhejiang University, Hangzhou , China
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Abstract:
      Owing to its simple structure and primary-side zero-voltage switching (ZVS) in the full-load range, the MHz series resonant converter can easily achieve a high efficiency and a high power density, which is suitable for the high-frequency and modular developing trend of isolated DC-DC converters. As a result, it is attracting increasing attention from the industrial and academic cycles. However, the state-of-the-art DC-DC power module based on high-voltage Si MOSFET usually works at several hundreds of kHz, and its efficiency and power density do not meet the requirement of on-board integrated power module in server power supply. In this paper, the loss of the primary-side switching device at high frequency is analyzed, and it is proposed that the conduction loss of the primary-side switch can be reduced by means of low-voltage Si devices. On this basis, a multi-phase input-series output-parallel (ISOP) series resonant DC-DC converter was put forward for the on-board integrated power module in the DC power supply architecture at a data center. An experimental prototype was also designed and implemented, realizing a peak efficiency of 98.3%. The converter adopted a planar matrix transformer, and the prototype achieved a power density of 810 W/in3.
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