Hello friends,
I designed 300 W Half-Bridge SMPS with UC3825 IC.
Input Voltage : 230V AC / 325V DC
Output : 30V / 10A
Switching Frequency : 100 kHz
Transformer : ETD39/20/13, Primary : 50 Turns, Secondary1 : 7 Turns, Secondary2 : 7 Turns.
My design schematic is same the image attached.
My Problem is no output voltage. I can see 1-2V DC max.
According to image; I don't measure C1 capacitor voltage, it is zero. C2 capacitor voltage is 320V DC. (C1 and C2 should be charged to half the potential of the input voltage 320V DC)
Also Q1 MOSFET is heating and Q1 PWM signal is break down. However, Q2 MOSFET is working normally and its PWM signal is normal, too.
What is the problem?
Could you please help me?
