[TechAssist] Re: Charging Circuit--Riobi 14.5 drill Charger
- From: "Jerome Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 25 Sep 2004 01:42:00 -0400
Never worked on a drill charger but have worked on many camcorder and
portable camera/vcr chargers. We had circuit diagrams, circuit explanations,
training manuals. In addition to charging the battery quickly without
damaging it, there were a variety of safety features, not the same on every
charger. One safety feature that caused a lot of problems was the one
related to not attempting to charge a shorted battery. The charger would
give the battery a very brief shot of current. If the voltage did not come
up above a certain level, the charger would not attempt to continue
charging. If the voltage came up too far, as with an open or fully charged
battery, the charger would not attempt to charge also.
People would come in complaining that their charger was defective but the
problem was that their batteries had been sitting around discharged for a
long time and the voltage did not come up far enough during the brief
initial test period. We would put their batteries on a bench supply to get
some charge on them and after that their charger would start working
properly.
With a vcr or camcorder, the unit would shut off while there was still
plenty of voltage left, so there was no way for the load to run the voltage
down real low. With a drill or some other load like that you can run the
battery down pretty far. If the cells are not perfectly matched, some will
run down before the others. If current is still being drawn, the cells that
have run down will be getting charged in reverse. That doesnt do the cell
any good and seems to prolong the time it takes for the stack to build up
some voltage during charging. I doubt that there is any cell matching going
on in the stack manufacture.
Jerry Silverman
Greentron Inc
4 Newland Ave Greenville SC 29609
Fax/Phone 864 232 3889
greentron@xxxxxxx
----- Original Message -----
From: "Warren C." <warrenca@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, September 24, 2004 11:03 PM
Subject: [TechAssist] Re: Charging Circuit--Riobi 14.5 drill Charger
> Hi All For those who have been following this!
>
> I tinkered with this drill a bit today and found out a few things
> I hope that this helps others.
> The output device is a 7018 regulator probably on the negative side as the
bridge
> rectifier + goes straight to the
> battery + terminal.
> The third connection on the battery goes to a thermal fuse then onto the -
> terminal of the battery (all inside the battery of course)
> I also jumpered out the regulator and this turned off the (green) fully
charged
> light and brought on the (red) fast charge light. Voila!
> Testing the battery voltage it started to rise fairly quickly. I left it
this way
> for about 1 minute to see how the drill itself would respond. It responded
very
> well.
> Interesting thing-- with my jumpers now removed the charger now goes to
fast
> charge on it's own when you plug in the battery.
> I will have to see if I jump started it or damaged it. ( nothing to loose
right).
>
> Tomorrow!!
>
> Old TV Man wrote:
>
> > I just bought a 14.4 drill with charger and several accessories for
> > $29.99 and am getting a $10.00 rebate. www.heartlandamerica.com
> >
> > Max Bonnell
> > Bonnell TV
> > Robinson, IL
> >
> > Sender: techassist-bounce@xxxxxxxxxxxxx From:
> > teltek3@xxxxxxxxxxxx(Tel-Tek=A0Electronics) Date: Thu, Sep 23, 2004,
> > 1:08pm (CDT+1) To: techassist@xxxxxxxxxxxxx Subject: [TechAssist] Re:
> > Charging Circuit--Riobi 14.4 drill Charger Reply=A0to:
> > techassist@xxxxxxxxxxxxx
> >
> > Same thing goes for you...you cheap bugger. With your money...go out and
> > buy a new one. If he lets you dump your Garbage in his bin....you have a
> > good starting point.
> > =A0=A0=A0=A0=A0=A0=A0=A0I sort of kid about this stuff, but you are all
> > starting to realize, it's really not a worthwhile effort, unless your
> > own time is written off.
> > But an answer to Secondary would be at least 25 to 30 volts.
> >
> > -Ed-
> > Ed Gaidies
> > Tel-Tek Electronics
> > Ontario-Canada
> > teltek3@xxxxxxxxxxxx
> >
> > ----- Original Message -----
> > From: "Gary McCartney" <gary@xxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Thursday, September 23, 2004 9:27 AM
> > Subject: [TechAssist] Re: Charging Circuit--Riobi 14.4 drill Charger
> >
> > Speaking of drill chargers, I have one here that I need to replace the
> > power transformer in it. The primary is open and no thermo fuse. The
> > drill is a Mastercraft (Canadian Tire, ED- your favourite :) ). How do I
> > know what secondary voltage to use? The drill is a 14.4V. Off hand, I
> > would think that around 18V to 20V winding would be about right. The
> > filter cap on the circuit board is rated 35V. Any ideas?
> >
> > Now to satisfy the "pitch it and buy new theory", this drill belongs to
> > a guy who lets me throw all my scrap electronics into his garbage bin in
> > return for repairing a few things he brings in. I at least need to put
> > in an effort on these items. In this case I do have a number of power
> > transformers sitting around doing nothing so parting with one is not a
> > big deal and it woulf keep me in good company with the bin.
> >
> > Gary McCartney
> > McCartney Electronics
> > Guelph Ontario Canada
> > Est. 1984
> > email: gary (at) number63.ca
> >
> > Edward Gaidies wrote:
> >
> > Warren;
> > Depending on the Charger, I would presume you have 12.2V from white to
> > red, and 12.2V from white red. The white is normally fed back to the
> > charger to determine when to go into trickle charge mode. The
> > question.....why are you pissing around with this, when you can go to
> > Canadian Tire, and buy a Drill with 2 Batteries and a Charger for
> > $79.95?:-)
> > Reason these Solid State Components have no part numbers on them, is
> > because they are not meant to be repaired, and even if there was a part
> > number, you don't expect to find a Parts Department for this
> > company....do you????
> > Come on...Get with the program;-)
> > I was using a B&D drill for 7 years, Had Internal NI-CAD battery packs
> > (2). When I wanted to replace the battery packs, they were $47 each. The
> > new version of this drill was $49 Retail. You must have a Birthday
> > coming up, or an Anniversary...Treat yourself...and if you can't find
> > your favourite color.....Paint it. HEHE. Typical Canadian.
> > -Ed-
> > **********************************************
> > Ed Gaidies
> > Tel-Tek Electronics
> > Ontario-Canada
> > teltek3@xxxxxxxxxxxx
> >
> > On 23-Sep-04, at 7:59 AM, Warren C. wrote:
> > Are you suggesting that this three legged device in the charger is a
> > protector of
> > some kind?
> > A white wire leads to it. The other two wires are red and black of
> > course.
> > When you test for vlotage at the battery itself to this third connector
> > one finds
> > that it is almost at
> > ground potential. It's so stupid when companys take the numbers off
> > parts!! This
> > ticks me off!!
> >
> > Warren C.
> >
> > Roger G wrote:
> > Third connector usually goes to a thermal protector or some kind of
> > protector
> >
> > Roger G.
> > Mr. Fix-It
> > Harrisburg, PA 17110 =A0 WebSite- http://mrfixit.netfirms.com
> > rogerfixit@xxxxxxxx
> > FAX 510-740-3641; Tel: 717-763-7098 (shop) 717-652-1703(home)
> > At 11:19 PM 9/22/2004, you wrote:
> >
> > I hope no one minds this question.
> > Does anyone have a circuit diagram of this charging unit. The fast
> > charge light does not come on , only the other two lights.
> > I also would like to know what the third connector on the battery is
> > for. When you follow this wire into the charger you come to an output
> > devise (transistor??) that has no numbers on it. (figures eah)
> > My theory is that this devise may be bad and the drill batteries are
> > fine.
> > BTW the main (-) and (+) connections to the battery are on the left
> > and
> > right side and they connect fine.
> > When you test for voltage in the charger at these two points you get a
> > reading of 24.6 V
> > Can you help???
> > TIA
> >
> > Warren Campbell
> > Campbell's TV & Appliances
> > Cannington ON
> > ----------------------------------------------
> > --------
> >
>
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