moc3021 and BTA16 ac dimmer

Other Hardware Motors, Mechanics, Power and CNC
1

Can any one have idea of ac dimmer without zero-crossing detection , i am working on dimmer and trying to make without zero-crossing but not working,

2

Nilanj:
Can any one have idea of ac dimmer without zero-crossing detection , i am working on dimmer and trying to make without zero-crossing but not working,

I think that it's possible, but not aware of it much details. I'm talking about frequency converter. Which will change the frequency in order to change current going to loads.

Any one can correct me if i'm wrong. Thanks

3

i use moc3021 and BTA16 , connction are as normal as found on internet, when i give PWM value to 0 its's going to turn on , But when i gave PWM 1 to 255 than it's not make big difference !!!!!

Why is that happening?

can any one explain it!!!

4

Hi,
I think you need to research how a triac controls current to dim a lamp.
It has to do with timing and the sinusoidal waveform of the AC supply, the timing is based on the zero crossing point to make the process easy.

You could detect the peak of the waveform but that would be more involved.
Using the Arduino PWM will not give you a result as its frequency is much higher than the mains AC frequency for a start.

Can you tell us your electronics, programming, arduino, hardware experience?

http://www.sprags.com/index.html

Tom..... :slight_smile:

5

thanks @TomGeorge.

i read the article, and it gives lot of knowledge. it clears my concepts.

6

you need to research variable frequency drives and industrial power control an SCR may be what you need

7

yes , you are right @rogertee