Dual-Transformer Series Resonant Converter with Full Range ZVS Operation

doi:10.16183/j.cnki.jsjtu.2023.389

Abstract

Abstract:

A dual-transformer series resonant converter (DTSRC) is proposed to solve the problem of excessive return power and loss of zero voltage switching (ZVS) operation under light load in the dual bridge resonant converter (DBRC). A dual-transformer structure is employed on the proposed converter, which can significantly reduce voltage stress across the transformers. Additionally, the ZVS operation under light-load conditions is achieved and switching losses are minimized by optimizing the turns ratio coefficient. To eliminate backflow power and reduce conduction loss, a minimum current trajectory (MCT) control strategy is implemented for the DTSRC. Thus, synchronous rectification is realized on the secondary side, which makes the converter always operate with minimum current. Finally, a 200 W/100 kHz prototype is built to verify the effectiveness of the proposed solution. The experimental results demonstrate that the ZVS of all active switches is achieved during full power ranges, and the overall operating efficiency of DTSRC exceeds 90%.

Key words: series resonant converter, zero voltage switching (ZVS), minimum current, switching loss, conduction loss

CLC Number:

TM461
TM462

LI Yinan, HU Song, LI Xiaodong, CHEN Wu, ZHONG Liping, YANG Qingqing. Dual-Transformer Series Resonant Converter with Full Range ZVS Operation[J]. Journal of Shanghai Jiao Tong University, 2025, 59(6): 789-799.

Figures/Tables 13

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Tab.1

Summary of achieving ZVS conditions of switches

开关管	ZVS条件
M_A, M_B	2Mcos γ- $1 k$ cos α-1<0
M_C, M_D	2Mcos(γ-α)-cos α- $1 k$ <0
M_E, M_F, M_G, M_H	2M-cos γ- $1 k$ cos(γ-α)>0

Tab.1

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