Isolated Bidirectional DC–DC Converter with Quasi-Resonant Zero-Voltage Switching for Battery Charge Equalization


Charge equalization out for a series connected battery string is important to improve utilization life and execution of cells. In this project, a isolated bidirectional DC-DC converter with quasi resonant zero-voltage switching (ZVS) is proposed for incorporated charge adjustment system. Through the quasi resonant task, the proposed converter can accomplish ZVS activities in both lift and buck modes, which diminishes switching misfortunes and enhances the effectiveness.

The energy leakage inductance is discharged to output side in support mode and reused to the info side in buck mode, which kills the voltage spike. In addition, the proposed converter has less parts than existing converters utilized in incorporated charge balance system. The working standard and hypothetical inference of the proposed converter are displayed. The ZVS usage and conditions are analyzed and illustrated in detail. At last, the trials utilizing a 7.2 Ah battery string of 13 cells are led. The outcomes confirm the legitimacy of the proposed converter and demonstrate that the equalizer accomplishes great execution as far as equalizing speed and efficiency.

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