A zero-voltage and zero-current welding inverter with current doubler rectifier

A full-bridge with zero-voltage and zero-current switching (ZVZCS) PWM DC-DC welding inverter by employing phase-shift and current-doubler-rectifier is presented.The zero-voltage turn-on was achieved for the leading-leg of the converter, and zero-current turn-off was achieved for the lagging-leg, and the rectifier diodes in the secondary side were turned off naturally.All the power semiconductors in the converter were operated with softswitching condition.Hence the switching stresses, losses and interferes were reduced, and electromagnetic compatibility is improved. It is especially suitable for the high power output applications.The switching frequency can be increased, and the dynamic response can be improved.The soft-switching operating range and the design considerations were discussed.Finally, a 2 kWwelding inverter was designed, and the experimental results show its the good performances.