KGCZ01 single-phase universal AC (closed-loop) rectifier trigger board can be used for single-phase full-bridge rectifier, half-bridge rectifier, single-phase full-wave rectifier and other circuit structures of thyristor trigger control. The trigger board contains power transformer, synchronous signal detection, sawtooth wave forming circuit, closed-loop PI regulator and pulse transformer output unit. According to actual needs, it can be constructed into a single-phase controllable silicon rectifier system with constant voltage or constant current output function. The output of this trigger board can be manually adjusted and can also be controlled by standard signals.