双向DC-DC直流变换器设计优化

s a countermeasure to the problems of low charging mode efficiency and low current control accuracy in bidirectional DC-DC converters, an optimized design of the battery energy storage device for bidirectional DC-DC converters was proposed. The device includes a bidirectional DC-DC main circuit, a measurement and control circuit, and an auxiliary power supply. The main circuit topology was a synchronous rectifier non isolated buck/boost (BUCK/BOOST) circuit and STM32F103ZET6 was employed as the core controller. Bidirectional energy flow was achieved via applying software compensation network, digital calibration technology, and proportional-integral-derivative (PID) digital closed-loop control technology. The results show that the charging mode conversion efficiency is as high as 98%, the current control accuracy is not less than 3%, the current change rate is not greater than 1%, and the discharge mode conversion efficiency is as high as 97%. The optimization of the device greatly improves the efficiency of energy conversion and the accuracy of current control.