Modulating bench supply output

[PeterFW]

Hello!
I would like to put something on the output of my bench supply that will make me able to either get a current limited PWM voltage source or frequency modulated.
As well as a inverter to get a square AC output.

So, basically just a H Bridge with a controller, the controller is no problem, my focus is on the "power" part for now.

The thing should work over the whole voltage range 0-12V and should work up to 20A to 30A.
The circuit will have a seperate power supply, i have stable 3.3V, 5V and 12V.

My best solution for now would be a ir2110 with a N-FETs and P-FETs.
Regular H-Bridge motor drivers all seem to have a undervoltage feature, wich i do not want.

Greetings,
Peter

[Kleinstein]

Depending on the minimum frequency needed I would look for a bridge with 4 N channel Mosfets and bootstrapping drivers.  The IR2110 is exactly that kind of driver - so I don't think it would work well with N and P channel.

If you need very slow operation an auxiliary supply / charge pump is needed to provide a little current for the high side drivers while constantly on.

[PeterFW]

If you need very slow operation an auxiliary supply / charge pump is needed to provide a little current for the high side drivers while constantly on.

That is the reason i wanted to go with N and P channel FETs, i have not been able to find a driver that will work with 100% duty cycle.

[Kleinstein]

With P-MOSFETs you would need a negative supply and a suitable driver too. So the P_MOSFET is not attractive when the bridge voltage can go below about 5 V.

With most of these drivers one can add a charge pump / extra positive supply so they will then work with 100% duty cycle. It needs only little current (e.g. 0.1 mA)  and maybe a zener diode to limit the voltage in the bootstrapping capacitor.

Thats likely easier than getting a negative supply.