I've been looking at driving an H-Bridge to raise the frequency of the mains voltage from 60 hz to somewhere between 60-120 hz.
I'm planning to use an Atmel Atiny84 to generate my clock frequency to drive an H Bridge. The mains voltage will be rectified by a full bridge rectifier, giving me nominally 240 VDC at up to 50 amps.
I have scavenged basically all the parts needed to do this, but from what I understand the highside of the H-Bridge requires either the use of P-channel MOSFETs or a voltage higher than the source voltage. This is because
Vgs determines the conduction state of the MOSFET. So if the source is being fed at approximately +240 VDC, I need at least +252 VDC for most power MOSFETs to be saturated and fully conducting.
Most commercial circuits use a "charge pump" built into a large brick of silicion that spec. sheets are not available on. So my question is if I already have 240 VAC, can I just feed any of the common voltage doubler circuits and wind up with 480 VDC? The current I need for the gate is small, so capacitor size should not be an issue. I'd wind up with +240 V for
Vgs if I did this, which is way too high for common power MOSFETs. But can I somehow feed this very high voltage into a common part like a 7815 to wind up with a
Vgs of approximately +15 V ? This might require more components and be less effecient, but I don't really care.