Hi,
I apologise if this topic has already been covered.
I'd like to create an AC duty-cycle controller using a microcontroller. Basically, I'd like to use a digital input on the uC to count both negative and positive AC peaks, and fire two bi-directional thyristors using a digital output on the uC.
My application is to control a simple heating element duty cycle so that I can have close PID control of water temperature.
I would be grateful for any advice on this application, namely: is this the best (or a good) way to do it, and if so how could I produce a 3.3v digital input signal from a standard 240VAC supply? Also, could I fire the thyristors directly from a (opto-isolated) digital output?
I was thinking of using a 3.3v Zenner diode for the input, but I'm really not sure that this is the best way.
Regards
Jim
I apologise if this topic has already been covered.
I'd like to create an AC duty-cycle controller using a microcontroller. Basically, I'd like to use a digital input on the uC to count both negative and positive AC peaks, and fire two bi-directional thyristors using a digital output on the uC.
My application is to control a simple heating element duty cycle so that I can have close PID control of water temperature.
I would be grateful for any advice on this application, namely: is this the best (or a good) way to do it, and if so how could I produce a 3.3v digital input signal from a standard 240VAC supply? Also, could I fire the thyristors directly from a (opto-isolated) digital output?
I was thinking of using a 3.3v Zenner diode for the input, but I'm really not sure that this is the best way.
Regards
Jim
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