| 摘要 |
A method and apparatus for providing 3 phase input to a welding type power source is disclosed. The power source is capable of receiving wide range of 3 phase input voltage and rectifies the ac input into a dc power capable for welding application. The power source consist of two stages, the first stage is a phase shifted full bridge inverter running near to maximum duty cycle to minimize the losses in the converter which is followed by the second stage buck chopper. This buck chopper deals with wide voltage levels and incorporates a power factor correction circuit
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