Difference between Optotriac driver (With and without Zero crossing Circuit)

Thread Starter

Mussawar

Joined Oct 17, 2011
76
Hi everyone,
Consider this a learning question.
I need help to understand the difference of working between Optotriac driver (with built-in Zero crossing circuit e.g MOC3081) and (without Zero crossing circuit e.g MOC3071). While both can drive a Triac from a logic input, is there any special scenario where we use optotriac driver with built-in ZCD?
Any help is highly appreciated.
Thanks and regards.
 

Ian0

Joined Aug 7, 2020
3,462
Two situations when you need to use the random phase type.
1) Where you are implementing a phase-fired control circuit (which varies the power by chopping the waveform).
2) where you are switching on a large transformer, in which case you should aim to switch it just after mains peak.
In all other circumstances use the zero-switched types to cut down on mains interference.

If you are doing a phase-fired control circuit, you will need an inductor/capacitor filter to remove the interference.
 

Thread Starter

Mussawar

Joined Oct 17, 2011
76
Two situations when you need to use the random phase type.
1) Where you are implementing a phase-fired control circuit (which varies the power by chopping the waveform).
2) where you are switching on a large transformer, in which case you should aim to switch it just after mains peak.
In all other circumstances use the zero-switched types to cut down on mains interference.

If you are doing a phase-fired control circuit, you will need an inductor/capacitor filter to remove the interference.
Thanks for this simple and easy explanation. Now it's clear to me.
 
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