Bidirectional half‐bridge LLC resonant converter with automatic current sharing characteristic

Author:

Zhu Xiaoquan12ORCID,Liu Kang1,Jin Ke1,Zhang Bo3

Affiliation:

1. College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing China

2. Nanjing University of Aeronautics and Astronautics No.29, Jiangjun Avenue, Jiangning District Nanjing 211106 China

3. School of Electric Power Engineering South China University of Technology Guangzhou China

Abstract

SummaryA bidirectional half‐bridge (BHB) LLC resonant converter with automatic current sharing characteristics is proposed in this paper for high‐power bidirectional energy storage applications. With the help of magnetizing inductance of transformer, all MOSFETs on the primary and secondary sides can realize zero‐voltage switching. By grouping the secondary windings of the transformer, excellent current sharing can be achieved in both forward and backward operation modes even if there is a 10% error of the resonant parameters. Due to the half bridge structure in both primary and secondary sides, the number of switches is reduced. And the resonant capacitance is small, which is conducive to integrate into the isolation transformer. Thus, the power density and overall efficiency of the proposed converter can be improved. Whether the converter is in forward or backward operation mode, the PWM control strategy is consistent, and it is not required to control the power flow by regulating the phase shift angle of primary and secondary sides, which makes the control strategy of the proposed converter easier. Finally, an 850 W experimental prototype is established to verify the superiority of the proposed circuit. Under the full load condition, the measured peak efficiency is 98.11% and 97.11% in the forward and backward operating modes, respectively.

Funder

National Natural Science Foundation of China

Fundamental Research Funds for the Central Universities

Nanjing University of Aeronautics and Astronautics

Publisher

Wiley

Subject

Applied Mathematics,Electrical and Electronic Engineering,Computer Science Applications,Electronic, Optical and Magnetic Materials

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Adaptive droop control strategy of parallel LLC converters;International Journal of Circuit Theory and Applications;2023-10-16

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