Synchronize step 0 with the PWM

[josem-mp]

Hi all,
I'm doing a speed controller for a 2000w motor with PIC16F1824 using the PWM output.
Someone can tell me how sync step 0 feeding signal to the PWM output signal.

thanks

[dazz]

Hi josem
Can you expand on what you require as it makes it easier for others to advise on what you need

Regards
Dazz

[josem-mp]

Hi, I want to control the motor speed as a function of a signal from a potentiometer.
The PWM output of an optocoupler micro attacks controlling a triac which is responsible for varying the motor speed.
I'm detecting zero crossing taking after the bridge rectifier and taking it to the micro.
I need to synchronize the crossing 0 with the PWM.
This is the wiring diagram of test.

[dazz]

Hi Josem
I would change the opto isolator for one with an inbuilt ZCD circuit, as this will switch on when it detects the crossing point (thats what i used ages ago), but as you are using AC please read all the relevant datasheets etc as this post is only a suggestion subject to you reading all the relevant data etc. also try some searches on here using the terms triac or opto as i recall a few different posts on the subject

Regards
Dazz