I built a basic relay circuit using an AC solid state relay to turn on an AC pump. Send 5v into the SSR and the pump turns on. I also built a basic button controlled PWM circuit using my arduino. For each button tap it increases the PWM duty by 10%. I connected LED’s to test and as expected the LED…

pcmofo, Your design appears to depend on two things in which I have little confidence: that your motor will allow substantial range of speed setting by varying the input voltage and that your PWM control scheme produces variable-voltage AC power. The former you should be able to ascertain …

I think the problem you are having is due to your use of PWM to control an AC motor. Nothing will happen unless your SSR is always on or running perfectly in phase with your AC supply. This is because your SSR may be in it’s ‘on’ state as your AC signal (mains) passes through zero volts and as AC cu…

PWM + SSR relay

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stevech November 1, 2010, 6:47pm 3

Some SSRs don’t switch quickly, nor can the control the AC signal’s duty cycle using zero-crossings.

You may need a TRIAC type circuit.

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PWM + SSR relay

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