Which quadrant TRIAC works ? Working of traic.

Thread Starter

mishra87

Joined Jan 17, 2016
906
It doesn’t.
There needs to be a common terminal between the drive circuit and the triac.
Like this:
Also note the snubber circuit, not a diode, across the motor
Hi,
Thanks for your reply.
I still could not understand why 5VDC is connected in L.

Could you please explain further ?
How and which quadrant triac works for this circuit ?
1605545574816.png
 

Ian0

Joined Aug 7, 2020
1,615
MT1 is connected to live. The trigger voltage is the voltage between gate and MT1. Therefore a supply of -5V DC referred to LIVE is required to provide the trigger voltage.
The triac operates in quadrants 2 and 3.
 
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