Hello, I have designed a push pull converter to step up 12V DC to 200VDC to be used as the DC link of an inverter. The issue I am facing is when I connect the transformer I get basically a shirt circuit and the voltage at the circuit input drops down to 4V. I am using a 14V input from a 3amp transformer (rectified and filtered). The High frequency transformer is rated about 200W. It's 8+8 turns primary and 140 turns secondary. I use the EE42/21/15 ferrite core. Any idea why this is occuring?