Forums

Can anyone explain how this battery charger works?

Started by Commander Kinsey February 13, 2022
https://imgur.com/a/b8l5qKQ

Look at the circuit diagram.  The positive of the battery is only connected through a capacitor.  How can a capacitor possibly pass DC current to allow the battery to charge?
On Sun, 13 Feb 2022 20:33:34 -0000, Birdbrain Macaw (aka "Commander Kinsey",
"James Wilkinson", "Steven Wanker","Bruce Farquar", "Fred Johnson, etc.),
the pathological resident idiot and attention whore of all the uk ngs,
blathered again:

<FLUSH the subnormal sociopathic trolling attention whore's latest
attention-baiting sick bullshit unread again>

-- 
damduck-egg@yahoo.co.uk about Birdbrain Macaw's (now "Commander Kinsey" LOL)
trolling:
"He is a well known attention seeking troll and every reply you
make feeds him.
Starts many threads most of which die quick as on the UK groups anyone
with sense Kill filed him ages ago which is why he now cross posts to
the US groups for a new audience.
This thread was unusual in that it derived and continued without him
to a large extent and his silly questioning is an attempt to get
noticed again."
MID: <be195d5jh0hktj054mvfu7ef9ap854mjdb@4ax.com>

-- 
ItsJoanNotJoann addressing Birdbrain Macaw's (now "Commander Kinsey" LOL):
"You're an annoying troll and I'm done with you and your
stupidity."
MID: <e39a6a7f-9677-4e78-a866-0590fe5bbc38@googlegroups.com>

-- 
AndyW addressing Birdbrain:
"Troll or idiot?...
You have been presented with a viewpoint with information, reasoning, 
historical cases, citations and references to back it up and wilfully 
ignore all going back to your idea which has no supporting information."
MID: <KaToA.263621$g93.262397@fx10.am4>
On Sun, 13 Feb 2022 20:55:51 -0000, Rick C <gnuarm.deletethisbit@gmail.com> wrote:

> On Sunday, February 13, 2022 at 3:33:49 PM UTC-5, Commander Kinsey wrote: >> https://imgur.com/a/b8l5qKQ >> >> Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge? > > Maybe it's an AC battery? They are very useful for grid storage applications as long as you can control the phase. > > What makes you think that component is a capacitor? I'm assuming you drew the schematic.
I've learned from someone on Quora that it's actually a PTC Fuse - a resettable semiconductor fuse. The second image in the link shows a brown disk, which I thought was a ceramic capacitor. Looks like it's to stop a busted battery from being overcharged when a cell has died.
On Sun, 13 Feb 2022 21:56:55 -0000, jkn <jkn_gg@nicorp.f9.co.uk> wrote:

> On Sunday, February 13, 2022 at 9:16:58 PM UTC, Custos Custodum wrote: >> On Sun, 13 Feb 2022 12:52:31 -0800 (PST), jkn <jkn...@nicorp.f9.co.uk> >> wrote: >> >On Sunday, February 13, 2022 at 8:33:42 PM UTC, Commander Kinsey wrote: >> >> https://imgur.com/a/b8l5qKQ >> >> >> >> Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge? >> > >> >What else might that yellow thing be, other than a capacitor? > >> A thermistor or a VDR, to provide current limiting. >> Regarding operation, power diodes tend to have a higher Vf than small >> signal diodes or transistor junctions, so once the diode goes into >> conduction it produces a large enough voltage to turn on the >> transistor and the red LED, indicating that charging is taking place. >> The green LED merely indicates that power is applied to the circuit. > > My (probably futile) hope was that he might answer it himself, > or at least try to...
I didn't expect two completely different devices to look identical. So how the fuck am I supposed to tell which one is?
On Mon, 14 Feb 2022 09:47:41 +1100, Commander Kinsey <CK1@nospam.com>  
wrote:

> On Sun, 13 Feb 2022 21:56:55 -0000, jkn <jkn_gg@nicorp.f9.co.uk> wrote: > >> On Sunday, February 13, 2022 at 9:16:58 PM UTC, Custos Custodum wrote: >>> On Sun, 13 Feb 2022 12:52:31 -0800 (PST), jkn <jkn...@nicorp.f9.co.uk> >>> wrote: >>> >On Sunday, February 13, 2022 at 8:33:42 PM UTC, Commander Kinsey >>> wrote: >>> >> https://imgur.com/a/b8l5qKQ >>> >> >>> >> Look at the circuit diagram. The positive of the battery is only >>> connected through a capacitor. How can a capacitor possibly pass DC >>> current to allow the battery to charge? >>> > >>> >What else might that yellow thing be, other than a capacitor? >> >>> A thermistor or a VDR, to provide current limiting. >>> Regarding operation, power diodes tend to have a higher Vf than small >>> signal diodes or transistor junctions, so once the diode goes into >>> conduction it produces a large enough voltage to turn on the >>> transistor and the red LED, indicating that charging is taking place. >>> The green LED merely indicates that power is applied to the circuit. >> >> My (probably futile) hope was that he might answer it himself, >> or at least try to... > > I didn't expect two completely different devices to look identical. So > how the fuck am I supposed to tell which one is?
The text on it, fuckwit.
On Sun, 13 Feb 2022 22:54:07 -0000, Phil Allison <pallison49@gmail.com> wrote:

> Commander Kinsey wrote: > ===================== >> >> > What makes you think that component is a capacitor? I'm assuming you drew the schematic. >> >> I've learned from someone on Quora that it's actually a PTC Fuse - a resettable semiconductor fuse. >> > ** It's "self resetting". > > Goes high resistance when hot and drops backs when cool. > >> The second image in the link shows a brown disk, which I thought was a ceramic capacitor. > > ** Shame about the odd markings.
Those aren't shown in the pictures.
>> Looks like it's to stop a busted battery from being overcharged when a cell has died. > > ** Nope. > > Would only act on a short or reverse connected battery.
One cell shorted, much higher current flows, duh. Now fuck off Rod.
On Sun, 13 Feb 2022 23:02:03 -0000, Rick C <gnuarm.deletethisbit@gmail.com> wrote:

> On Sunday, February 13, 2022 at 5:34:04 PM UTC-5, Commander Kinsey wrote: >> On Sun, 13 Feb 2022 20:55:51 -0000, Rick C <gnuarm.del...@gmail.com> wrote: >> >> > On Sunday, February 13, 2022 at 3:33:49 PM UTC-5, Commander Kinsey wrote: >> >> https://imgur.com/a/b8l5qKQ >> >> >> >> Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge? >> > >> > Maybe it's an AC battery? They are very useful for grid storage applications as long as you can control the phase. >> > >> > What makes you think that component is a capacitor? I'm assuming you drew the schematic. >> I've learned from someone on Quora that it's actually a PTC Fuse - a resettable semiconductor fuse. >> >> The second image in the link shows a brown disk, which I thought was a ceramic capacitor. Looks like it's to stop a busted battery from being overcharged when a cell has died. > > It won't do that. It is simply a fuse that prevents too high a current from flowing, such as if you connected the battery backwards.
Surely a higher current would flow if the battery became 9 cells instead of 10 because one failed and became zero volts? Ever tried charging a car battery with 14V when it only contains 5 working cells? The others boil.
> I'm not sure what this circuit is supposed to do. It doesn't look right to me.
It's the (5 hour) charger for a very cheap cordless drill. The input is a 14.4V wall wart. The output is to a pack of NiCad cells. It's worked fine for years, until I can no longer find replacement NiCad cells, so I'm converting the battery packs to LiIon.
On Mon, 14 Feb 2022 09:54:27 +1100, Rex Jones, better known as cantankerous
trolling senile geezer Rodent Speed, wrote:  

<FLUSH the two subnormal sociopathic cretins' endless absolutely idiotic
blather>

-- 
Another typical retarded "conversation" between the two resident idiots:

Birdbrain: "But imagine how cool it was to own slaves."

Senile Rodent: "Yeah, right. Feed them, clothe them, and fix them when 
they're broken.
After all, you paid good money for them.  Then you've got to keep an eye
on them all the time."

Birdbrain: "Better than having to give them wages on top of that."

Senile Rodent: "Specially when they make more slaves for you
and produce their own food and clothes."

MID: <fvlcdcFq2icU1@mid.individual.net>
On Sun, 13 Feb 2022 20:33:34 -0000, "Commander Kinsey"
<CK1@nospam.com> wrote:

>https://imgur.com/a/b8l5qKQ > >Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge?
It can't. Maybe that yellow disk is not a capacitor. -- I yam what I yam - Popeye
On Sun, 13 Feb 2022 22:47:41 -0000, "Commander Kinsey"
<CK1@nospam.com> wrote:

>On Sun, 13 Feb 2022 21:56:55 -0000, jkn <jkn_gg@nicorp.f9.co.uk> wrote: > >> On Sunday, February 13, 2022 at 9:16:58 PM UTC, Custos Custodum wrote: >>> On Sun, 13 Feb 2022 12:52:31 -0800 (PST), jkn <jkn...@nicorp.f9.co.uk> >>> wrote: >>> >On Sunday, February 13, 2022 at 8:33:42 PM UTC, Commander Kinsey wrote: >>> >> https://imgur.com/a/b8l5qKQ >>> >> >>> >> Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge? >>> > >>> >What else might that yellow thing be, other than a capacitor? >> >>> A thermistor or a VDR, to provide current limiting. >>> Regarding operation, power diodes tend to have a higher Vf than small >>> signal diodes or transistor junctions, so once the diode goes into >>> conduction it produces a large enough voltage to turn on the >>> transistor and the red LED, indicating that charging is taking place. >>> The green LED merely indicates that power is applied to the circuit. >> >> My (probably futile) hope was that he might answer it himself, >> or at least try to... > >I didn't expect two completely different devices to look identical. So how the fuck am I supposed to tell which one is?
Try an ohmmeter. -- I yam what I yam - Popeye