半桥式双向DC-DC变换器的优化控制研究

Research and optimal control for half-bridge bidirectional DC-DC converter

双向DC-DC变换器在混合动力汽车和直流不间断供电系统等场合应用广泛。半桥式是双向DC-DC变换器最常用的拓扑结构,其一般采用PWM的控制方式,但使用此控制方式下电路存在较大反向电流。针对减小电路反向电流这一目标,在半桥双向DC-DC电路拓扑中使用峰谷值双门限控制方式。然后通过PSIM仿真与搭建实验样机,对两种控制方式下半桥双向DC-DC电路反向电流进行对比,验证了该控制策略在半桥双向DC-DC电路拓扑中应用的可行性,实现了减小电路反向电流的目标。

Bidirectional DC-DC converters are widely used in hybrid vehicles and DC uninterruptible power supply systems.Half-bridge is the most common topology for bidirectional DC-DC converters.It generally adopts PWM control method,but there is a large reverse current in the circuit using this control mode.In order to reduce the reverse current of the circuit,a peak-to-valley double threshold control method is used in the half-bridge bidirectional DC-DC circuit topology.Then simulate and build the experimental prototype through PSIM,comparing the reverse currents of the two-half bridge DC-DC circuits under two control modes,the feasibility of the control strategy is verified,and the goal of reducing the reverse current of the circuit is achieved.