Re: PWM frequency ?
From: Paul Burridge (pb_at_notthisbit.osiris1.co.uk)
Date: 07/18/04
- Next message: John Larkin: "Re: How to work Maths is the time sample domain"
- Previous message: Paul Burridge: "Re: bONK! Kevin Aylward"
- In reply to: Gareth: "Re: PWM frequency ?"
- Next in thread: cb: "Re: PWM frequency ?"
- Messages sorted by: [ date ] [ thread ]
Date: Sun, 18 Jul 2004 19:44:53 +0100
On Sun, 18 Jul 2004 13:50:51 +0100, Gareth <me@privacy.net> wrote:
>cb wrote:
>
>> Greetings,
>> Can anyone tell me if there is an ideal frequency, in terms of efficiency, for PWM speed
>> control on a low voltage DC motor ?
>> If this is correct can the frequency be calculated or is it a matter of trial and error ?
>> Thanks
>> CB
>
>Since the most power will be wasted as the FETs are in the process of
>switching, the less switching you do the better. Therefore I think a
>lower frequency would be more efficient.
Depends how much time overall your FETs spend in the ohmic region, I'd
have said. That surely is the overall measure of efficiency: whichever
gives rise to the least amount of heat produced.
-- "What is now proved was once only imagin'd." - William Blake, 1793.
- Next message: John Larkin: "Re: How to work Maths is the time sample domain"
- Previous message: Paul Burridge: "Re: bONK! Kevin Aylward"
- In reply to: Gareth: "Re: PWM frequency ?"
- Next in thread: cb: "Re: PWM frequency ?"
- Messages sorted by: [ date ] [ thread ]
Relevant Pages
|
