What's wrong with this circuit?

[prinsloo]

230v zero crossing detector circuit

Dear Members

The circuit is continuously conducting 230V AC. I connected it to a uc-PIC and want to switch a series of lights on/off.


I have read something about "a zero crossing switching"
Is this done via the PIC? Is it a special program to be written?

Pls help.
Thx in advance.

 

[prinsloo]

snubber circuit wiki

Can anabody pls help me? I have seen a lot of questions about triacs but no answers.

Regards

 

[hamdard]

this will not work because the signal applied to gate is not proper and is not with proper level.

 

[teteamigo]

Power phase control


https://en.wikipedia.org/wiki/Snubber

A snubber circuit is often used to assist this turn off. Snubber circuits are also used to prevent premature triggering.

Some kind of Averaging needed...

A capacitor stores energy in max pi/2 or T/4.

Tiristor control is possible in max pi/2.


Nice!!!

https://www.epanorama.net/documents/lights/lightdimmer.html#history


Phase Control is implemented by triggering a optotriac that switchs the snubber to the gate of triac.

This triggering circuit need a reference in time, like zero crossing detector (beginning of possible phase control), then we should control the time of triggering by comparing ramp signal (integration of pulse in zero crossing detector) with a DC variable level.

By this way we gain safety, because we don't have to control a potenciometer over mains voltage.




You have the snubber bad implemented.


Push help button

 

[kelvin_foru]

The snubber circuit is wrong, well you can check this circuit.
**broken link removed**

kelvin

 

[prinsloo]

Re: Still not working

Dear Members

I tried the .jpg diagram that is available.Now the light is off-when the 5V is present it does not switch on.Is the voltage on the gate to low?

What should the voltage be? I don't understand the data sheet so well.



How do I fix it?

Thanks in advance

Regards
Johan

 

[blueroomelectronics]

Here's one with a snubber. A zero crossing detector is a separate circuit.
**broken link removed**

And here's a typical zero crossing detector
**broken link removed**