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Re: [PSUBS-MAILIST] PWM Controllers
An SCR is similar to a latching relay, and a FET is similar to a non-latching
relay. FETs only work full-on and full-off. They destroy themselves if you
use them in an "analog" manner.
Warren.
>
> Robin Williams does a bit on acronyms, Not PWM, FET, or SCR. FET is
> basically an electronic relay I believe.
>
>
> Jay.
>
>
>
>
> jbarlow@bjservices.ca
> Sent by: To: personal_submersibles@psubs.org
> owner-personal_submersible cc:
> s@psubs.org Subject: Re: [PSUBS-MAILIST] PWM Controllers
>
>
> 20/01/2003 07:43 PM
> Please respond to
> personal_submersibles
>
>
>
>
>
>
>
> FYI,
>
> I have said for some time that the downfall of our civilization will be the
> use of acronyms. It is almost getting to point where people can't
> understand each other.
> Is the end of communication the end of civilization??
>
> LOL. (-: ......
>
> I think PWM is "pulse width modulation" ??
>
> The DC motor is turned on and off rapidly to reduce the power going to it
> instead of using as resistor to run at less than full throttle. (though
> electric motors don't actually have throttles)
>
>
>
> Robin Williams does a good bit on it in Good Morning Vietnam.
>
>
> MECHANICAL GUY ,
>
> Jay.
>
>
>
>
>
>
> John Rogers
>
> <djohnndjinn@yahoo.com> To:
> personal_submersibles@psubs.org
>
> Sent by: cc:
>
> owner-personal_submersible Subject: Re:
> [PSUBS-MAILIST] PWM Controllers
> s@psubs.org
>
>
>
> 20/01/2003 07:27 PM
>
> Please respond to
>
> personal_submersibles
>
>
>
>
>
>
>
> FET = field effect transistor
>
>
> SCR = silicon controlled rectifier
>
>
> --John
>
>
> "Dale A. Raby" <publisher@thegreenbayweb.com> wrote:
> Militarese translation:
>
> LT = Lieutenant
> MRE's = Meals Rejected by Ethiopians (US soldiers and sailors eat 'em
> though)
> AWOL = Absent WithOut Leave
> SOL = Shit Outa Luck
>
> Now... I'd kinda like to know what FET's SCR's etc are as well!
>
> On Mon, 2003-01-20 at 19:34, Chris Nugent wrote:
> Would someone mind yelling down to the little people and
> explaining what exactly FET's, SCR's, IGBT's ARE? And perhaps a nod
> in the direction of where one can pick up the basics of what is
> being talked about? My LT told me I had to help with the MRE's
> because the cook was AWOL, and if I don't figure this out I'll be
> SOL and my sub will be DOA.
>
> Thanks,
>
> Nuge
>
> Subscuba@aol.com wrote:
> At least, and a bridge is what I would go with. You would
> probably have to parallel several in each leg of the bridge to
> avoid dissipation problems.
>
> There are a number of ICs on the market to do the drive
> functions. I think ONSEMI has one. You would have to do the
> power stages. Layout of the power stages are the bear.
>
> I would suggest IXYS as a starting vendor for the FETs. I
> think their site is "WWW.IXYS.com" they are not the only
> vendor.
>
> Ken Martindale
>
> One other note on the price issue you brought up,
> though. A
> reversible speed controller requires a FET H bridge,
> which means
> twice the FETs. A forward only could be made for $5.00.
> A good
> reversible would easily hit $10.00.
>
>
>
>
>
> Do you Yahoo!?
> Yahoo! Mail Plus - Powerful. Affordable. Sign up now
>
>
> Dale A. Raby
>
> Editor/Publisher
>
> The Green Bay Web
>
> http://www.thegreenbayweb.com
>
>
>
>
>
>
> Do you Yahoo!?
> Yahoo! Mail Plus - Powerful. Affordable. Sign up now
>
>
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>
--
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