基于级联式整流电源的恒流均压控制方法

针对电磁探测的大功率电磁场激发需要，本文采用输入并联输出串联的级联式整流电源，提高输出电压等级，保证激发功率。为了满足电磁探测过程中输出电流的稳定性，提出了基于双闭环的恒流均压控制算法。分析了级联式直流电源恒流均压输出的原理，建立了电源的数学模型，设计了电压电流环的控制器，在Matlab/Simulink中搭建仿真模型并通过控制器参数优化从而降低误差。级联式直流电源由于上下两部分可能存在器件参数不同的情况，这就导致在恒流控制下两级电源输出电压不同，在动态情况下的偏差会更大从而引起器件不均压而损坏，因此在考虑控制恒流输出的同时需要加入控制均压输出。通过对输出电流电压进行采样，经控制器转换为相应的脉冲触发对应的开关器件从而实现恒流均压输出。仿真结果显示输出电流控制在2 A，电流变化在5%以下。

Constant current and voltage equalization control method for cascade rectifier power supply

Aiming at the high-power electromagnetic field excitation needs of electromagnetic detection, this paper adopts a cascaded rectifier power supply with input in parallel and output in series to increase the output voltage level and ensure the excitation power. In order to satisfy the stability of output current, a constant current and voltage equalization control algorithm based on double closed loops was proposed. The principle of constant current and voltage equalization of cascaded DC power supply was analyzed, the mathematical model of the power supply was established, the voltage and current loop controller was designed, the simulation model was built in Matlab/Simulink and the controller parameters were optimized to reduce the error. Because the upper and lower parts of the cascaded DC power supply may have different device parameters, this leads to different output voltages of the two power supplies under constant current control, and the deviation was greater under dynamic conditions, which caused damage to the device due to uneven voltage. Therefore, it is necessary to add the control voltage equalization output while considering the control of the constant current output. By sampling the output current and voltage, the controller converted it into the corresponding pulse to trigger the corresponding switching device to realize the constant current and voltage equalization output. The simulation results showed that the output current is controlled at 2 A, and the current change is below 5%.