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Topic: Complex use for Arduino PWM with SSR. (Read 1 time) previous topic - next topic

Hi there this is my first post on these forums and hope to learn a lot.

I would like to know is it possible to feesibly control an SSR with Arduino's PWM.
The SSR will drive Ceramic heating plates or even quartz, and be temperature controlled via controlling the power given to the heating element i.e. 25%-30%...->100%

Much appreciated and thanks for reading.

And yes I have read this which is 2 years old -http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1259899177

retrolefty


Hi there this is my first post on these forums and hope to learn a lot.

I would like to know is it possible to feesibly control an SSR with Arduino's PWM.
The SSR will drive Ceramic heating plates or even quartz, and be temperature controlled via controlling the power given to the heating element i.e. 25%-30%...->100%

Much appreciated and thanks for reading.

And yes I have read this which is 2 years old -http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1259899177


Actually no. Most SSRs are not phase controlled switches, but rather just turn on or not each half cycle of the AC waveform (so called zero crossing switching control), so 8.333 millisec control is the fastest switching decision an SSR can make. The analogWrite() PWM output is at a much faster switching rate so there would be almost no relationship between the PWM duty cycle output signal and the response that the SSR would take to that signal.

Also most heating controls do not take or need a fast switching control speed. Just varying the duty cycle within a 10 second 'window' should give more then enough control response, as temperature is not a particularly fast process to control in most heater applications due to process response lag time.

Lefty





However Elstein HSR ceramic heater are extremely fast and this is my need for optimum control.
On a Ceramic heater how would I be able to set the power to say just 50% with the application of arduino as control., then later adjustable to say 75%. Thanks for the reply btw

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