模块化大功率电解电源的研究

摘要

High-power electrolytic power supply need the module in parallel when they output large current.Due to the power supply module differentiation or incidental malfunctions,it will cause the system power reduction or the whole system crash.At present,a lot of electrolytic power supply adopt analog circuit control method.This way of controlling is inconvenient to the external communication and is not flexible,which can't meet the requirements of high precision and high stability.Aiming at these problem,a current-sharing method is presented which based on CAN bus communication maximum current sharing method.This method adapts the traditional analog circuit of maximum current method combined with the CAN communication control,which through the CAN communication control to realize the current sharing and the digital of the power supply.And aiming at the power efficiency optimization problem,a topology of the ZVS phase-shifted full-bridge topology is designed with auxiliary current source network,which raise the efficiency of power supply.In the experimental prototype,the power module realizes the soft switch,improves the efficiency.The maximum current method based on CAN bus communication realizes the automatic current-sharing of the parallel system,and the current-sharing effect is good.%模块化大功率电解电源需模块间并联输出大电流,由于电源模块的差异化或偶然发生故障,会引起系统功率降低甚至整个系统崩溃.目前电解电源多采用模拟电路的控制方式,该控制方式对外通信不方便,控制方式不灵活,不能满足电源的高精度与高稳定性的要求.在此提出一种基于CAN总线通讯的最大电流均流法.该方法将传统模拟电路中用到的最大电流法与CAN总线通讯控制相结合,通过CAN总线通信控制的方式来实现电源的均流,实现了电源的数字化控制.并针对电源效率优化问题,设计了一种基于辅助电流源网络的电源拓扑结构,提高了电源的效率.在仿真和实验中电源模块实现了软开关,提高了电源的效率,基于CAN总线通讯的最大电流法实现了并联系统的自动均流,且均流效果良好.