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Flyback Primary Current Problem

Guest eemree87

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Guest eemree87

Hi Everybody, I implemented a flyback converter, but while I am expecting a triangle shape current at primary side (in DCM) and a square wave current shape in CCM I measured sth like sinusoidal. I couldn’t get rid of it for one week. I need your suggestions and comments. Thanks .
I explained the problem in details here:

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  • 2 months later...

Where is the schematic? What is the output voltage & current? Where are you measuring the input current... directly across the I sense resistor? Do you have a RC fiter on it before the PWM

Try to make it run without the active clamp first (just use RC or DRC snubbers).

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