High reliability whole-bridge converting welding power supply

The utility model relates to a whole-bridge inverting and welding power supply with high reliability, which is composed of a main circuit of an inverter and a control circuit, wherein, the main circuit of an inverter is composed of four high power tubes VA, VA2, VB1 and VB2, and an output transformer T; in the control circuit, ICA and ICB are synchronized integrated packages of pulse-width modulation; the circuits in a dashed line frame II and a dashed line frame I are completely identical; only the phase the logic control signal of a sampling-holding circuit respectively has difference of 180DEG. The utility model can realize real-time identification and abstract the current signals, of the positive and negative half periods, which flow through the primary pole of the output transformer, conduction time signals and magnetic biasing signals, and respectively carries out real-time feed-back control for the work of the positive and the negative half periods of the inverter.