半桥零电流DC-DC变换器电压PI控制与滑模控制研究

A research on Voltage PI Control and Sliaing-mode Control Strategy of HB-2CS DC-DC Converter

大功率直流变换器普遍采用IGBT作为开关器件,其开关损耗很大一部分是由IGBT拖尾电流引起的关断损耗,零电流开关技术可以大大降低IGBT的关断损耗。文章首先介绍半桥零电流直流变换器实现IGBT零电流关断的工作过程,建立了直流变换器的数学模型。针对负载变化时输出电压不稳定的问题,文章提出电压PI控制与滑模控制策略,并进行对比分析与仿真验证。

The IGBT as the switch devices is widely used in high power de converter.The switching loss of IGBT is mainly turn-off loss caused by the tailing current of IGBT.The zero current switching technology can greatly reduce turn-off loss of IGBT.This paper first introduces the working process of HB-ZCS DC-DC converter to realize zero current turn off of IGBT and establishes its mathematical model.Aiming at the problem of unstable output voltage when the load changes,this paper proposes voltage PI control and sliding mode control,which are verified by simulation.