Problem with forward converter

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mayurprajapati

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Hello,

I am working with 180W , 36V, 5A rating forward converter, i am facing problem with resetting the core using Reset winding.

i have used EE42/21/15 ferrite core, primary turns is 25, secondary turns is 30, reset winding turns is 25, auxillary turns is 3. i have use RG2 fast recovery diode having 100ns RR time(trr).


please explain me how to choose fast recovery diode and what is the problem with my circuit

please help me
 

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