一种直流电源模块并联运行均流方法

电源模块间的并联运行均流控制是实际应用中常见的问题。针对电源模块并联运行均流控制中存在的均流精度不高、稳定性差、抗干扰能力低的问题,提出了一种电压环结合双电流环进行均流控制的方法。对直流电源模块的输出电压进行采样,形成外电压环,稳定输出电压。利用最大电流均流的方法对模块输出电流进行均流控制,形成外电流环。各模块主电路电流经过采样电路连接到处理器形成内电流环,保证输出电流和均流的精度。电压环和双电流环经过处理器的调制,产生脉宽调制(PWM)对各个直流电源模块进行控制。通过仿真分析和2台4 000 W样机测试,验证了电压环和双电流环控制的均流方法具有均流精度高、稳定性好、抗干扰能力强的优点。

A Current Sharing Method for Parallel Operation of DC Power Module

Current sharing control of parallel operation between power modules is a common problem in practical applications. In view of problems with low current sharing accuracy, poor stability and low anti-interference ability in current sharing control of parallel operation of power modules, a method of current sharing control with voltage loop and double-current-loop is proposed. Output voltage of DC power module is sampled, and the external voltage loop is formed to stabilize the output voltage. Maximum current sharing method is used to control the output current of module and form the external current loop. Main circuit current of each module is connected to the processor through sampling circuit to form the internal current loop. In this way, the accuracy of output current and current sharing can be ensured. Voltage loop and double-current-loop are modulated by the processor, generating PWM to control each DC power module. Through simulation analysis and tests of two 4 000 W prototypes, it is verified that the current sharing method controlled by voltage loop and double-current-loop has the advantages of high current sharing accuracy, good stability and strong anti-interference ability.