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Thread: How does PWM work?

  1. #1

    Default How does PWM work?

    Searched and found the question, but not the answer. This is probably obvious, but want to confirm. If I have PWM Output set to 100 Hz and the Duty Cycle is 50%, does this mean that it sends 50 pulses of .01s duration per second? 75% would be 75 pulses of .01s duration per second? 100% would be 100 pulses of .01s duration per second (i.e. continuous)? Thanks.

  2. #2

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    A "normal" square signal will have half of the time high state and the other half off state. This is 50% duty cycle. At 0% will be always off and at 100% always on.
    Last edited by Pacha; 07-24-2019 at 02:34 PM.

  3. #3
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    There's some graphical examples on pages 15-17: https://forums.holley.com/showthread...014#post218014 (V4 Software/Firmware Update Overview)
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  4. #4

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    Thanks for the responses. I think the link is wrong as the charts are focused on Timers, but I think I get the idea now.
    25% at 100 Hz would have 100 .0025s *on* cycles per second (and 100 .0075s *off* cycles)
    50% at 100 Hz would have 100 .005s *on* cycles per second (and 100 .005s *off* cycles)
    75% at 100 Hz would have 100 .0075s *on cycles per second (and 100 .0025s *off* cycles)
    100% at 100 Hz would have 100 .01s *on* cycles per second (always on). Thanks again.

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