charge NiMH 3.6 350 mA battery - Electronic Circuits Projects Diagrams Free

oslinux23@yahoo.gr · 18th July 2008, 01:29 PM

Hello I want to charge a NiMH 3.6 350 mA battery and I want to find a circuit 220 V (AC) to charge the battery

ste5442 · 18th July 2008, 03:09 PM

Hi,

A company called Linear Technology (linear.com) do a range of off-the-shelf charger IC's - most NiMH charger ICs only require a couple of extra components and could easily be bodged into an existing wall-wart type power supply enclosure.
Please note that I dont think you will find (an IC) one with 220VAC input and charger output ;-)
There are some good app note on the Maxim website about battery charging as well.

Good luck with it!

S.

picbits · 18th July 2008, 04:19 PM

Wall wart to convert it down to somewhere around 7-9 volts then an LM317 running in current limiting mode to provide a 35ma constant current charge.

audioguru · 18th July 2008, 07:09 PM

Energizer and other battery manufacturers recommend using a trickle charge current no more than C/40 which is only 8.75mA for this tiny battery.
You need a battery charger IC to detect when the battery is fully charged then swith off the chearger or switch to a low trickle charge current.

The battery charger IC will be able to charge quicker than all night long.

Boomslang · 18th July 2008, 07:18 PM

Just get a cheap nokia phone charger, put 2 of the batteries you want to charge in series and your'e done. The charging current might be a bit high, but I've used it many times (and if your'e not worried that you will not get a 1000 recharges from it). Just note it will not stop charging when the batteries are full.
Do not play around with 220V.

audioguru · 19th July 2008, 05:29 AM

A Ni-MH battery charger knows when the battery is full and turns off the charging.
A Nokia power supply is made to feed the lithium charger circuit in a cell phone and will overcharge a Ni-MH battery.

Boomslang · 19th July 2008, 07:14 AM

I should have added: OLD Nokia charger from a second hand shop. IE: 5110 charger. Sorry. As far as I can tell it does not stop charging when the battery is full... never tested it.

ste5442 · 20th July 2008, 01:23 PM

Most of the newer phones I have dealt with power a charger IC which is inside the phone.
Do the older phone power supplies have a charger IC built in?

audioguru · 20th July 2008, 02:06 PM

We should be talking about apower supply for a phone, not a charger.

If you want to charge a battery properly then you need a power supply and a charger circuit.

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18th July 2008, 01:29 PM	(permalink)
oslinux23@yahoo.gr	charge NiMH 3.6 350 mA battery Hello I want to charge a NiMH 3.6 350 mA battery and I want to find a circuit 220 V (AC) to charge the battery

18th July 2008, 03:09 PM	(permalink)
ste5442	Hi, A company called Linear Technology (linear.com) do a range of off-the-shelf charger IC's - most NiMH charger ICs only require a couple of extra components and could easily be bodged into an existing wall-wart type power supply enclosure. Please note that I dont think you will find (an IC) one with 220VAC input and charger output ;-) There are some good app note on the Maxim website about battery charging as well. Good luck with it! S. __________________ advert removed by moderator.

18th July 2008, 04:19 PM	(permalink)
picbits	Wall wart to convert it down to somewhere around 7-9 volts then an LM317 running in current limiting mode to provide a 35ma constant current charge.

18th July 2008, 07:09 PM	(permalink)
audioguru	Energizer and other battery manufacturers recommend using a trickle charge current no more than C/40 which is only 8.75mA for this tiny battery. You need a battery charger IC to detect when the battery is fully charged then swith off the chearger or switch to a low trickle charge current. The battery charger IC will be able to charge quicker than all night long. __________________ Uncle $crooge

18th July 2008, 07:18 PM	(permalink)
Boomslang	Just get a cheap nokia phone charger, put 2 of the batteries you want to charge in series and your'e done. The charging current might be a bit high, but I've used it many times (and if your'e not worried that you will not get a 1000 recharges from it). Just note it will not stop charging when the batteries are full. Do not play around with 220V. __________________ How To Ask Questions The Smart Way

19th July 2008, 05:29 AM	(permalink)
audioguru	A Ni-MH battery charger knows when the battery is full and turns off the charging. A Nokia power supply is made to feed the lithium charger circuit in a cell phone and will overcharge a Ni-MH battery. __________________ Uncle $crooge

19th July 2008, 07:14 AM	(permalink)
Boomslang	I should have added: OLD Nokia charger from a second hand shop. IE: 5110 charger. Sorry. As far as I can tell it does not stop charging when the battery is full... never tested it. __________________ How To Ask Questions The Smart Way

20th July 2008, 01:23 PM	(permalink)
ste5442	Most of the newer phones I have dealt with power a charger IC which is inside the phone. Do the older phone power supplies have a charger IC built in? __________________ advert removed by moderator.

20th July 2008, 02:06 PM	(permalink)
audioguru	We should be talking about apower supply for a phone, not a charger. If you want to charge a battery properly then you need a power supply and a charger circuit. __________________ Uncle $crooge