Research on DSP Control System of Three Phase Staggered Multiple Bidirectional DC/DC Chopper

In the field of power storage and emergency power supply, three phase staggered bidirectional DC/DC chopper power conversion module will be widely used. In this paper, a three phase multiplex bidirectional DC/DC chopper based on SiCMOSFET high frequency power device is developed. It can realize the Boost chopper power supply or discharge from lithium-ion energy storage battery to the load, and also realize the buck chopper operation from the energy regenerative load to the energy storage battery, so as to realize the charging function of the battery and realize the bidirectional flow of energy. The three phase staggered control mode based on DSP controller and the control algorithm of voltage and current double PI regulator can realize the multi-mode and high performance operation of DC/DC chopper. The two operating modes and commutation state of bidirectional DC/DC chopper are analyzed. The hardware circuit of DSP controller and the software of PI regulator control algorithm are designed. The experimental prototype is built, and the DC/DC chopper and the control system are verified by experiments.