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The power supply is indeed not working but the signal is still there coming from the control pwm ic.I think my understanding of your question must be wrong. It appears to me that you have removed the IGBTs and are still getting an output otherwise how can you increase the output current. I do not see how the power supply can work with the IGBTs removed.
Les.
I have been assuming that this is a power supply had the output isolated from the input and that the feedback is via an opto coupler Can you post the schematic and explain the statement "even though am increasing the output current ."
Les.