移相全桥ZVZCS变换器的数字控制与实现  

The Digital Control and Realization of Full Bridge Phase-shifted ZVZCS Converter

作　　者：苏瑞涛[1] 米禹丰[2] 贲洪奇[1] 

机构地区：[1]哈尔滨工业大学电气工程系,哈尔滨150001 [2]哈尔滨工程大学自动化学院,哈尔滨150001

出　　处：《电源学报》2011年第3期43-48,共6页Journal of Power Supply

摘　　要：基于变压器原边串联饱和电感和隔直电容的移相全桥主电路,构建了电源的数字控制系统,实现ZVZCS软开关控制。采用平均电流型控制方式,电源具有良好的稳态和动态特性。平均电流型控制方式需要检测电感电流的平均值信号,论文根据电感电流与变压器原边电流的对应关系,利用电流互感器通过采样变压器原边电流得到电感电流的平均值信号,省去了霍尔元件。数字控制方式可以通过软件调整死区时间,避免了在模拟控制条件下,由于死区时间固定而在高压轻载时实现超前臂ZVS困难的问题。并且,提出了一种简单有效的数字实现方案,合理地利用了DSP芯片TMS320F2812的系统资源。On the basis of full bridge phase-shifted converter with the primary side of the transformer series with saturated conductor and blocking capacitor,the digital control system is built and the ZVZCS soft-switching control is realized.The power supply system has good steady and dynamic characteristics for adopting average current control mode,which needs to sample the average current signal of the inductor.According to the relationships of the current of the primary side and the inductor,the primary current instead of the current of the inductor is sampled,which saves a Hall component.Digital control mode has the advantage of regulating the dead time automatically which solves the problem of realizing soft switching difficultly after high input voltage and light load.Finally,a simple and effective digital control method which uses the resources of TMS320F2812 reasonably is proposed.

关 键 词：数字控制 移相全桥ZVZCS 平均电流型控制 死区时间 

分 类 号：TM46[电气工程—电器]