Soft start method and system of hybrid input-series output-parallel direct current transformer

The invention provides a soft start method and system of a hybrid input-series output-parallel direct current transformer. The soft start method comprises configuration of an ISOP input side capacitor capacitance value and a withstand voltage value and SR-DAB and PS-DAB three-section variable modulation strategies. According to the invention, different modulation, current limiting and conversion control strategies are used in different starting stages, so that the overshoot of the starting current and the voltage of the capacitor and the load is limited, and the output of the ISOP can quickly and stably reach the specified output voltage; the soft start problem of the hybrid ISOP direct current transformer can be solved, the over-current and over-voltage problems are solved, the implementation is simple, the efficiency is high, the loss is low, and the practical value is very high. 本公开提供了一种混合型输入串联输出并联直流变压器的软启动方法及系统，包括ISOP输入侧电容容值和耐压值的配置及SR-DAB和PS-DAB三段式变调制策略的软启动方法；本公开通过在不同启动阶段使用不同的调制、限流、转换控制策略，限制了启动电流与电容、负载的电压