use of CCP interrupt for TRIAC Firi

[jean12]

Hello,could you lease advise on the requirement,I would like to use the voltage comparator for detecting the zero cross detection and then use the CCP interrupt for controlling the bulb,the CCP interrupt is activated once the zero cross is detected,I would like also to add a potentiometer such that the firing angle could be adjusted ,please help

 

[ahmed-agt]

Hi,
why using comparator to detect zero crossing? Is it better than interrupt on input level change.
Meanwhile, using ccp to control the triac you have to know that it is not just to adjust pulse width.
Take Note, zero crossing detection, follow by firing the angle on. The time between zero crossing and Firing angle is what you adjusting.
It can occur immediately after zero crossing detection, up about 90degree of the wave which indicates maximum to minimum power output respectively.

 

[jean12]

I have used a NPN transistor based circuit but I now have a big problem with microcontroller the circuit is not working at all(The motor doesn`t turn) but when I use a dc source of 3.3V in place of MOC3020 output the motor turns on and rotate effectively,I am asking myself how I could turn the motor on and also by changing the delay time for firing angle find a good output I mean variable output voltage.

Please help.

 

[ahmed-agt]

Can I see your circuit? Tyr and use a simple method. Use an opto coupler circuit to detect the zero crossing and use interrupt on port change input. Use time delay to manage the process.