An improved plan of silicon controlled rectifier (SCR) line type trigger is described in detail. Anew practical circuit of bipolar transistor trigger for high pulse repeat frequency is presented.

PWM rectifier might become an ideal electric appliance or a linkage between grid-line and other electric facilities, characterized of pollution-free and adjustable power factor.

The uniform current test of the rectifier for traction power is the test subject that aimed at inspecting the current distribution of the rectifying elements in every parallel branch line bridge.