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Switchable voltage doubler for AC square wave circuit
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aiq25:
Hi. I'm working on a voltage doubler using the capacitors on the output of the bridge rectifier. I found the attached concept online.

I have a square wave output though, around 12Vpeak with 85% duty cycle as my AC source. I don't always need the voltage doubler, only when the input voltage drops. My idea is to use a MOSFET as the switch and switch in the doubler when I need it. My question is, since the body diode of the MOSFET will cause current to follow when I don't want to, can I use two MOSFET's (with the body diodes pointing at each other, so that one it will cancel out) or is there an easier circuit I can use?

I have tried this circuit in SPICE and it seems to work but I'm worried about the real life implementation of it. My goal is to be able to boost the voltage and power around 50W load. The input will be a battery with voltage range 6-12V. I want the doubler to work below 9V.

Any feedback is appreciated.
JackJones:
Using dual MOSFETs is a common configuration for switching AC. You do need an isolated driver for the gate though. They do make photovoltaic drivers just for that.

Why not just use a relay though? Would be much simpler to implement.
aiq25:

--- Quote from: JackJones on December 03, 2018, 05:45:19 am ---Using dual MOSFETs is a common configuration for switching AC. You do need an isolated driver for the gate though. They do make photovoltaic drivers just for that.

Why not just use a relay though? Would be much simpler to implement.

--- End quote ---

Thanks.

I'm using MOSFET's to create the square wave, so it's easier to use just those (one less part count). I agree relay is easier to use though.
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