Hi,

I am working on designing on board charger. For this first stage convert AC power to DC power. For this I took, totem pole configuration as example.Here RL is connected as a load resistance. In this configuration, capacitor charges and discharges through RL. When RL is removed, I see capacitor charges to higher extent and goes beyond limit. What should be done to limit the capacitor storage when RL is removed.



Thanks,
Sam

 

hi Sam,
What are the voltage and current levels in the circuit.?
E

 

Two obvious kludges are to: 1) Use a cap with a higher rating, or 2) Add enough resistance in parallel to the load to prevent the spike. It's possible that a high resistance, a trivial load, might be enough. If you need anything more elegant than that, I'm out.