Multiphase BHB-CLL Resonant Converter Based on Secondary-Side VDR With Automatic Current Sharing Characteristic

作者：Zhu, Xiaoquan^*; Liu, Kang; Zhang, Bo; Jin, Ke

来源：IEEE Transactions on Industrial Electronics, 2024, 71(2): 1443-1455.

DOI：10.1109/TIE.2023.3253952

• Bidirectional power flow
• CLL resonant converter
• current sharing
• voltage-doubling rectifier (VDR)

In this article, a multiphase bidirectional half-bridge CLL resonant converter with automatic current sharing characteristics is proposed for high-power bidirectional energy storage applications. The CLL converter is obtained by placing the resonant inductor in the voltage-doubling rectifier. Compared with the LLC resonant converter, the circulating current related to the magnetizing current of the transformer is removed from the resonant inductor. Without extra components and control schemes, excellent current-sharing performance can be achieved only by connecting two wires in the two-phase resonant tanks, even when the resonant parameters have a 10% tolerance. The current-sharing performance of the proposed converter is analyzed by the first harmonic approximation method, and a 1200-W experimental prototype is built to verify the superiority of the proposed converter. Under the full-load condition, the measured peak efficiencies in forward and backward operation modes are 97.99% and 97.8%, respectively, and the output current sharing errors are 0.51% and 4.0%, respectively.

• 单位
  南京航空航天大学