双半桥双向DC/DC变换器分析和控制

Analysis and Control of Double-half Bridge Bidirectional DC/DC Converter

研究了双半桥双向DC/DC变换器的工作原理和控制策略。首先分析了该拓扑的工作原理及正向工作模式,然后推导了变换器输出功率与移相角、占空比及开关频率的关系,并给出了软开关的实现条件,再分析了环流的产生机理及影响因素,提出了抑制环流的方法,并提出了PWM加移相的控制策略和调整开关频率相结合的控制策略,最后通过对不同控制策略仿真,验证了该控制策略的可行性。

The working principle and control strategy of the double-half bridge bidirectional DC/DC converter was studied.Firstly,the working principle and forward working mode of the topology were analyzed.Then the relationship between the converter output power and the phase shift angle,duty cycle and switching frequency was derived,and the realization conditions of soft switching were given.The mechanism and influencing factors of circulating current were analyzed,the method of suppressing circulating current was proposed,and the control strategy combining PWM plus phase shift control and adjusting switching frequency was proposed.Finally,the feasibility of the control strategy was verified by the simulation of different control strategies.