Harmonic Elimination Input Current for a Three-phase High Power Arc Welding Inverter

The arc welding inverter improves system efficiency and controllability.Their applications,however,increase the harmonic distortion level of the input current. Active power factor correction technique uses power electronic switching to cancel the harmonic currents from a nonlinear load. So that the current being supplied from input line is sinusoidal. This paper analyses relationship between the power factor and input current distortion of the inverter power source. A three-phase configuration of a new power factor correct circuit that makes use of continuous input current is suggested. Continuous sinusoidal input current is achieved by the average current mode control technique. The theoretical analysis is verified with digitally simulated results. The selected experimental results from a laboratory prototype rated at 10kW demonstrating the three-phase power factor correct circuit operation are also presented.