bogdan2011
Member
I've built a SEPIC converter and I'm having trouble making it work with coupled inductors. It works well with separate inductors, but with the coupled inductor I get a lot of ringing and the voltage drops and can't go up with a load attached.
Schematic:
Waveform at the inductor
Waveform at the gate of the switch
The converter is built on perfboard so there's some expected ringing. The controller is UC3845 and the switching frequency is 80kHz.
I suspect it might need some kind of snubber at the drain of the switch, but there's the issue of the voltage dropping.
Schematic:
Waveform at the inductor
Waveform at the gate of the switch
The converter is built on perfboard so there's some expected ringing. The controller is UC3845 and the switching frequency is 80kHz.
I suspect it might need some kind of snubber at the drain of the switch, but there's the issue of the voltage dropping.