A Bidirectional DHC-LT Resonant DC-DC Converter with Research on Improved Fundamental Harmonic Analysis Considering Phase Angle of Load Impedance

Shuhuai Zhang, Xuezhi Wu, Ziqian Zhang and Xuejiang Zhang
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Shuhuai Zhang: Faculty of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Xuezhi Wu: Faculty of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Ziqian Zhang: Beijing Dynamic Power Co., Ltd., Beijing 100070, China
Xuejiang Zhang: Beijing Dynamic Power Co., Ltd., Beijing 100070, China

Energies, 2022, vol. 15, issue 14, 1-23

Abstract: This paper presents a novel 400 V–50 V bidirectional DHC-LT resonant DC-DC converter. By adding a resonant capacitor and an auxiliary transformer based on LLC, zero-voltage switching (ZVS) and zero-current switching (ZCS) are achieved, while the output voltage gain range is broadened in two directions. Operation principles and robustness are discussed with equations. Then, the error factor of fundamental harmonic analysis (FHA) in resonant converters is analyzed. Considering the phase difference between the output voltage and resonant tank current, an improved method is proposed to describe the behavior of the DHC-LT converter more precisely. A comparison is conducted to prove the effectiveness of the proposed FHA. Furthermore, in order to reduce the output voltage and provide a ripple-free charging current, a fixed-frequency phase-shift strategy is introduced in the DHC-LT converter. ZVS can be realized through the reasonable design of dead time and phase-shift angle. Finally, a 2.5 kW prototype of the DHC-LT resonant DC-DC converter with a digital signal processor (DSP) platform and a battery/PV DC test system is established in the lab to validate the theoretical analysis.

Keywords: bidirectional; DHC-LT resonant DC-DC converter; FHA; phase-shift control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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