pwm heater coil
Hi,
The Phase Control is easy to build, but is not very good decision. Generate high range of noise, radiofrequency and impulse over power supply. Depend from your case you can use some like PWM but with low frequency. For example, you put the Diode Bridge; this will give you 100 Hz pulse. Use the SRC with commutation on zero. And you can regulate the power with change the Number of impulse to heather. For example, your PWm period is 1 s, and if you switch SRC only for one impulse, this is duty 1%, if switch for all 100 impulse this is duty 100%. The PWM frequency is a low, 1 Hz, but actually in many case this is enough, because the controlled object was inert ion. Also you must very accuracy calculate the time for PID algorithm, no need very fast algorithm, or high frequency of sample if you object is slow, for example ceramic furnace. If your process is fastest, you can use directly PWM or Phase Control. In this case, you must get some extra step, to reduce the radiation.