In my project I already have all the circuits for a PWM driving some high power MOSFET. Now the hardware guys are coming with this AC heater, and I've been breaking my head around Triacs and phase controllers but that will be an extra design time that we don't have available.
I wonder if I get the AC through a bridge rectifier (240V, 60Hz) and then through my PWMed MOSFET controlled at 1Khz. I know the final wave won't be pretty to look at in an oscilloscope, but it's just a heater (a resistance), it shouldn't matter if the current is really going or not to both sides.
Does anyone see any problems in doing this setup?
Edit: The PWMs already working in the project through high power MOSFETsare isolate through OpAmps that keeps the proper gate charge levels on the MOSFETs. Those already work nicely controlling a compressor and a pump. The difference from those and the one I'm asking about is only a proper stable DC or a mirrored sine AC between drain and source.
Below is the circuity that is already working for the pump and compressor and the main idea I was trying to re-use it a bit for the heaters. I mean, just because the heater manufacturer said the heater is 240Vac it doesn't meant I can put 240Vdc (full rectified but no capacitor) on it.