Jack,
Yes, you use a PWM signal and convert it in to an AC signal. For example when PWM is 1, then it's + current, or if PWM is 0, then it's - current. But if I understand, you need also a "Zero" current state as well. In this case, the "Power part" of the schematic does not change. You keep as it is. What does change is the control part. When "Zero" current state is needed, you close all the 4 MOSFET gates. So there are a little changes to perform on the control part. If you want to use pulse of 100ns, MOSFET might not be the good answer. It depends on the voltage and current needed. For 10A, 600V cheap MOSFET like FQP10N60C, the turn ON or OFF time is too large to be used below 1MHz. What is the max current and voltage of the power part of the circuit? Arnaud _____ From: Jack Cole [mailto:jcol...@gmail.com] Arnaud (or anyone who can answer), So if I understand correctly, you could use a PWM pulse with an H bridge to get AC from a PWM signal? I think I looked into this before, and the problem would be that you wouldn't have the "dead space" in the current. Let's say you have a 100 ns + current and when this is switched off, the H bridge allows the - current for the remainder of the duty cycle. This gets you closer, but is still not what is needed. If I understand correctly, you need a bipolar pulse (then no current in between the pulses).
