Re: PWM and dither
- From: "Martin Riddle" <martin_rid@xxxxxxxxxxx>
- Date: Mon, 10 Mar 2008 01:48:11 GMT
"Pasquale" <desmomito@xxxxxxxxxxxx> wrote in message news:47d48b6a$0$16039$5fc30a8@xxxxxxxxxxxxxxxxxx
Hi,
I need to control a solenoid valve using PWM but I have also some
specifications about "the dither" in order to reduce friction etc.. I now
what the dither is able to do in theory. I now how to built an electronic
circuit concerning PWM (I'd do that using a micro plus a MOSFET etc.) but
I don't have any idea about "the dither". Should I sum another PWM with
lower frequency to the higher frequency PWM which control the valve
position ? Do you have any example or links in order to clarify this
aspect ?
Thank you in advance,
Pasquale
A 'dither' technique typically increases the PWM reolution by one or two bits depending upon your tolerance for dither
ripple.
What is your dither spec and is it the same?
Cheers
.
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