Hi everyone, my name is Wilson. I've been trying to design a 300W12VDC to 380VDC converter lately as part of an inverter project. My original approach was to use half bridge topology alongside with RC snubber across primary winding. After I've made the transformer, I found the energy stored by leakage inductance was unacceptably high. I measured Lp as 2.5uH. At rated current 25A and switching freq 55kHz, the average power to be dissipated due to energy stored in Lp will be 1/2 LI^2 * 55k= 43W. To use simple RC snubber will require a really huge resistor, which is impractical and highly inefficient. My thesis supervisor told me it's an unavoidable problem of half bridge converter, and told me to use full bridge converter instead.
So all I want to ask is, is it not necessary to use snubber to discharge leakage inductance energy in full bridge converter, since the MOSFET already has body diode built in to freewheel the current (due to both Lp and Lm) ? Or is my supervisor just setting me up?
thankyou for helping in advance and for looking at my question! ^_^