Hi, I built my QR flyback supply for master diploma in study but I have issue with startup. When I'm starting from low voltage the transformer get strange noises to circle about 160V but I'don't have power on output, on 230V transformer is very silence but power is still low. I change my transformer to other sample but my power raise only to 5W and the LED output have large ripple's. I designed primary side regulation for constant voltage = 48V but on output i have only 43V. Anyone have this same problem ?
