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From: "Phil Allison"
References: <0001HW.B9D43FDF0325BBB11662EAD0@news.covad.net> <0001HW.B9D4EE870344BA681662EAD0@news.covad.net> <3DB01FBB.EAF744F9@usa.net> <0001HW.B9D572FB034E39101662EAD0@news.covad.net> <3DB02E27.firstname.lastname@example.org> <3DB42BB1.EC27E431@bellatlantic.net> <3DB4C57E.B06B96D5@bellatlantic.net> <3DB61379.5EFB8B5C@bellatlantic.net>
Subject: Re: Difference between AC adapter and charger?
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Wed, 23 Oct 2002 13:34:49 +1000
NNTP-Posting-Date: Wed, 23 Oct 2002 13:26:10 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
wrote in message
> Phil Allison wrote:
> > Well golly - I didn't know that I had never done that. In fact,
> > I've done it often, with both current regulated and voltage regulated
> > supplies.
> > ** So, what happened when you did ??
> No cell problem, no supply problem, good charge with
> both the constant current supply, and the voltage regulated
> supply. Every time, except when attempting to restore
> shorted cells by zapping, then charging. I'm only about
> 30% successful - regardless of how I charge them in that
> > ** Then that includes 95% of all wall warts.
> I haven't mentioned wall warts.
** That is the topic here - read the heading.
> > That has nothing to do with the issue of
> > > whether you are charging the cells with voltage regulation
> > > versus current regulation, however.
> > ** It has *everything" to do with it. The term "constant
> > implies NO current limit.
> I've repeatedly mentioned current limiting, yet you choose
> to respond to a nonexistent implication. I was specific
> and strong in describing a constant voltage supply that
> would push enough current through a NiCd cell to make it
> explode as an insane design.
** Then you are using the wrong term over and over. If the supply has
a current limit circuit and is connected to a pack of Ni-Cds then it is
ipso facto a constant current charger since the pack will draw current at
that limit. The voltage on the pack will vary with the state of charge - how
in God's name can that be called "constant voltage".
So you are arguing with something
> I not only never said, but specifically and strongly denounced.
** Rubbish - you posts were full of ambiguity and still are.
> > If there is a current limit included to make
> > things safe then why is everyone failing to mention it ?? A wall wort
> > an unregulted DC (or maybe AC) supply - the output voltgae is a
> > the load and the AC supply at the time.
> I can't answer for everyone. But you are dead wrong to say
> "everyone". I mentioned it in both posts I made. You simply
> ignore it.
> > ** I make no such presumptions. You seem to have redefined the
> > here with a verbal slight of hand. A wall wart PSU 9 regulated or
> > otherwise) is NOT a Ni-Cd charger at all.
> No verbal slight of hand, no re-definition, and I never mentioned
> wall warts. Talk about verbal slight of hand - you ignored what
> I wrote and argued with a non existent implication.
> > > But can you tell us what you have in mind by "explode"?
> > > Is it blowing the cell to smithereens, or venting, or
> > > somewhere in between?
> > ** Venting, going bang, becoming useless.
> > >
> > > You may have missed the part of the post that mentions current
> > > limiting. The fact that a supply is voltage regulated does not
> > > preclude a current limiting resistance between the supply and
> > > the load. Ohms law. :-)
> > ** What? 0.27 ohms worth - gimme a break.
> What are you talking about? Where did you come up with .27
> ohms resistance?
** Read the whole thread mate - w toms gave that figure.
Try 150 ohms between a 7.2 volt pack consisting
> of 6 1600 mah cells and a 13.8 volt regulated supply. Worst
> case - 92 ma. With the cells fully charged, 36 ma. It makes
> a real nice trickle charger.
** That is what is known in the trade as constant current charging.
BTW Why did you snip my detailed explanation ??
. . . . . . . . . . ..................... Phil
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