I have a project where I need to control water's temperature with a PID controller.
The problem is that I cannot use a PID controller
Still, the problem is that I need to control the RMS value at a heater..
In this case, the PWM signal has to be syncronized with the AC signal.. any tips on that?
According to power quality standards (e.g. IEC 1000-3-2) phase angle control isn't allowed for heating applications. You can decide to ignore the rules for a hobby project, but I would at least try to design state-of-the art full wave switching.You could always use phase control, as with a light dimmer.
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