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PWM problems

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Discussion in 'General Electronics Discussion' started by rob_croxford, Oct 6, 2010.

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  1. Oct 6, 2010 #1
    rob_croxford

    rob_croxford

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    Aug 3, 2010
    Hi all,

    I have designed a program on a pic that aswel as other things outputs a PWM signal from a voltage input. The program works prity much exactly how i want it to with 50% duty cycle being prity much exactly 50% duty cycle.

    My problem is at 0% and 100%. Please see pictures.

    The PWM runs at arrouns 319Hz, the +/- spikes are arround 1us long. will this be a problem in the over all working of the circuit?? can i do ne thing to make sure that at 0% there is 0V and at 100% there is full V??

    Cheers for any help.
    0%.gif

    100%.gif
     
  2. Oct 6, 2010 #2
    (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,264
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    Jan 21, 2010
    Yep, that's pretty much what you should expect.

    The only alternative is to turn off the PWM signal and drive the output high or low for 100% and 0%. Aesthetically it may be better, but functionally it is likely to make no difference.
     
  3. Oct 6, 2010 #3
    rob_croxford

    rob_croxford

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    Aug 3, 2010
    I thought as much, cheers Steve
     
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