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duty cycle detector(speed indicator)

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haydenlee87

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I have a duty cycle (730hz, 12V pk-pk, varying duty cycle) supplied to h-bridge as gating signals.
I need a speed indicator which I am designing to detect the maximum duty cycle.
when the duty cycle is 90%, I want some LED to be turn on.

Help me find some ways to figure this out.
or any other good method is welcome




Hayden
 

RC integrater and then comparator with a trimmable fixed voltage to compare with should do it.
 
If you rectify the signal with an H-bridge, you could feed that into a detector circuit. The output would then be a DC voltage, proportional to the input duty cycle. This DC voltage could be run into a comparator with a reference voltage, and used to drive your LED output. I haven't tried it, but you might fire up your favorite circuit simulator and mess around with it for a bit, see if you can find R-C values that would work.

C_Simple_envelope_detector.gif
 
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