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Subject: Re: Turning on a circuit till current increases...
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Date: Mon, 11 Nov 2002 16:51:41 -0800
NNTP-Posting-Date: Mon, 11 Nov 2002 16:49:47 MET
Organization: @Home Network
"Boris Nogoodnik" wrote in message
> "Michael" wrote in message
> > Hi - I need a circuit that would be designed to operate a car
> > window. The basic idea of it is for a fairly quick 5V (I
> think) pulse
> > to turn on the motor (running at 12V) and then for the motor
> to be
> > automaticaly turned off when the current running through the
> > starts increasing. This happens when the window reathes it's
> > point - where the motor is jammed. Could someone please give
> me some
> > suggestions as to how to do this? I am very inexperienced with
> > electronics - so please bear with me! Thanks so much!
> > Michael Noone
> > nleaNOSPAMhcim@hotIHATESPAMmail.com
> Another idea is too look for the rapid voltage drop near the
> motor. Wires connecting motor to the battery work as a very
> good resistor for this purpose.
I've searched through patents to see what's already invented for this
function. I've seen systems that measure the speed over the whole length of
movement, store longterm deviations, and when a big deviation is detected it
stops (pinch protection,required by law since 1998 or so in the USA).
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