Author Topic: Mains bidirectional switch (possibly using MOSFETS)?  (Read 496 times)

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Online ricko_ukTopic starter

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Mains bidirectional switch (possibly using MOSFETS)?
« on: July 25, 2020, 04:40:08 pm »
Hi,
not much experience in high-voltage power applications. I need to switch mains power (220V) going into a power board with very large capacitors so it needs to be switched on and off at zero crossing.

I have been searching on the internet but maybe not the right words because could not find anything that meets the requirements below.

I am looking for a suggestions/solutions with the following requirements:
- either discrete or IC or PCB mountable mini module (not a relay obviously because it needs to switch at the zero crossing)
- switching mains 220Vac on and off at crossover point (one of the reasons is that I am charging large capacitors at mains voltages
- continuous current at least 13A
- to be controlled by a micro floating at some other voltages

Another would be nice feature (but not required) is zero crossing detection that can be fed into a microcontroller.

Any suggestions of parts or schematics?

Many thanks
« Last Edit: July 25, 2020, 04:42:52 pm by ricko_uk »
 

Offline OM222O

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Re: Mains bidirectional switch (possibly using MOSFETS)?
« Reply #1 on: July 25, 2020, 04:52:46 pm »
Easiest component will be a triac or SSR but they have a bit of leakage. As for the zero crossing / micro, it's best to use a small SMPS / transformer and use it to power a zero crossing detector + an opto coupler. The MCU can drive the opto, turning it on, which combine with the zero crossing detector, turns on the triac. There's actually a post regarding a low power zero crossing detector on the first page of the forum if you scroll down a bit.
 
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