I have been designing a subwoofer amplifier for some while,I have implemented short circuit shutdown functionality ,but i'd like to have limiters with slow release that activate when the current crosses a threshold and a voltage limiter that activates when output comes near the rails,as opposed to having a fixed threshold.Pictured is the output section and short circuit shutdown sections.I know the schematic is a little messy and also the values are not exact,but I hope it can help
Regarding voltage limiting: if I'm you, I would make a window comparator with the desired window width, and with the output of it take the measure(s) needed, but imo it isn't necessary.
Regarding current, I would place a current transformer between the MOSFET's join and chokes (here you have strong AC current), integrate the current (preferredly actively) and with this signal, again, a window comparator checking both positive and negative limits, toguether or separately.
Regarding current, I would place a current transformer between the MOSFET's join and chokes (here you have strong AC current), integrate the current (preferredly actively) and with this signal, again, a window comparator checking both positive and negative limits, toguether or separately.
for current I can tap off the sense shunt,and that always gives me a positive voltage,then amplify and feed it into a peak detector,now I need to figure out some sort of voltage control amplifier,Back in the day,Vactrols(led and ldr coupled) were used to perform this function,but these are slow