Active clamp forward

I'm stuck as I can't seem to get an expression for jm1 for the active clamp forward. It may or may not be necessary, as Cclamp adjusts to reset the XFR but is there a way to determine this? Also it seems that once the turns ratio is fixed and the device parasitics are fixed (by virtue of selecting a particular mosfet) all I can do is play with Lm to achieve ZVS and select this in a manner that minimizes the magnetization current. Anybody else have a different approach?

Compensating resonant converters

I had a question regarding the compensation of a resonant converter be it a resonant inverter or a half/full bridge converter that has DC output voltage or any of the ZVS/ZCS half wave or full wave QR or QSW converters that we studied in class. How do we go about compensating such converters? Is a typical PID controller enough like the one we studied in intro to Power electronics? Or is there something additional required? Any tips and references are appreciated.

HW10.3 help

All,

I'm having trouble finding the value of J to get Ro so L and C can be solved for. I have a value for JL3=sqrt(1-2u) and JL4=0 at max load for ZVS but I can't determine how to find JL1, JL2 and J. It seems I should used the eqns from problem 2 but I'm having trouble with that problem as well and can't move forward on this problem.

Thanks, Joe

HW10.2 ZVS-QSW definitions

Hi,

In the notes with definitions for D and the angles, do the graph for v2 and the state-plane diagram match with each other? The state-plane diagram starts at (-JL4, 1), while the v2 plot starts at 0V. Shouldn't the v2 plot have started at V1=Vg, like was also discussed in the lectures? Then the v2 plot would match with the state-plane diagram again I would say.
Any comments?

Toby

HW9 problem 3 help

All,

I would like to know if anyone else is getting something besides Js=1.

Here is my approach. I have an equ. ckt like the boost with a half wave ZCS QR switch from the lecture notes. The current source is the current through Lm reflected to the secondary. If Js=1, then ton will be a specific value and not a range. Any help would be appreciated.

-Joe