Power modules can be divided into two categories: controllable modules and rectifier modules based on internal packaging chips; Distinguished from specific uses, it can be divided into: ordinary thyristor modules (MTC\MTX\MTK\MTA), ordinary rectifier modules (MDC), ordinary thyristors, rectifier hybrid modules (MFC), fast thyristors, rectifiers and hybrids Modules (MKC\MZC), non-insulated thyristors, rectifiers and hybrid modules (also commonly known as welding machine special modules MTG\MDG), three-phase rectifier bridge output thyristor modules (MDS), single-phase (three-phase phase) rectifier bridge module (MDQ), single-phase half-controlled bridge (three-phase fully controlled bridge) module (MTS) and Schottky module, etc.