Reversible hybrid control resonant converter for electric vehicle battery charging and discharging system

Abstract

In this study, the control modes in the newly designed converter include a variable frequency control mode, a phase shift control mode, and hybrid switching with a dual control mode. Compared with the traditional resonant converter, the newly designed converter has the following characteristics: (1) Zero voltage and zero current soft switching to improve converter efficiency in forward and reverse mode and wide voltage range, (2) solves the problem of voltage adjustment being difficult and switching loss increasing at light load for the resonant converter under the variable frequency control mode, (3) hybrid switching with a dual‐control strategy to resolve the design difficulty of digital control in hybrid switching control mode, (4) a closed loop control for the resonant converter with hybrid switching and dual‐ control mode. Finally, In the forward charging mode, the input voltage is 400 V, the output voltage is 250–450 V, the maximum power is 1000 W, and the maximum efficiency is 96.69%. In reverse discharge mode, the input voltage is 250–450 V, the output voltage is 400 V, and the efficiency at full load is 95.13%. The maximum conversion efficiency is 97.57% when the output power is 840 W.