/diy/ - Do It Yourself

>>1845308
>is this just standard inductor-capacitor ringing?
Yes, if you short inductor to ground shortly after it was already discharged by capacitor (in off cycle), only thing that can happen is for inductor to flip voltage and transfer energy from capacitor, which then transfers back to capacitor. Only thing that is strange here is that period of oscillation (from valley to next valley) should be around 628 us (2*pi*sqrt(LC)). I'm not familiar with your circuit simulator so time scales are a bit confusing to me. If I simulate in ltspice I get close to calculated value. You should also consider working with realistic models, inductor will have some series resistance which will have a great effect on transient response (0.5 Ohm for example could eliminate negative voltage).