中文说明：
单相桥式整流电路闭环相控调压，simulink中搭建单相桥式整流电路，利用PI控制方式，实现输出电压的相控。
English Description：
Single phase bridge rectifier circuit closed-loop phase control voltage regulation, single-phase bridge rectifier circuit is built in Simulink, and PI control mode is used to realize the phase control of output voltage.