Zero crossing detector

[theMASTER]

Hi all, i'd like to control some heating resistor (2*5kW per phase), so, up to 6 elements, and control their power.
I was thinking about using per phase:
-zero crossing detector to trigger the PWM output of a µ.
-use the PWM output to drive a TRIAC.

Any reference of zzero crossing detector to use?

I also wonder the kind of filter I would need to avoid noise injection onto the main. Any recommendations

 

[Narendrakumar]

Usually heater resistence have a lot of inertia, it's common to drive them in "burst" mode. Whith a zero-cossing triac you let the current flow for n-periods of line voltage (a burst of sinusoidal wave). No needs to syncronize your micro with zero crossing.

for more details ..
www.fairchildsemi.com/pf/MO/MOC3032-M.html

 

[budhy]

Use AC Phase Control to control AC power, not PWM.

 

[vishakha]

use IR2110 DRIVER FOR MOSFET ,USE bridge inverter to control the power.

 

[Narendrakumar]

visit fairchild site .. it will be useful for u