Battery Charging Circuit?

[2camjohn]

I have a battery I need to make a charge circuit for.

It says on it 6V 100ma. It is 5 1.2V cells which take a fast charge and a trickle charge.

Can somebody give me a simple trickle charge circuit for it?

and links to good sites about charging batteries?

Also, my circuit is usually powered my the battery in question. How do I protect my circuit from the higher voltage used to charge the battery?

Cheers

 

[gerty]

Here's a simple circuit: **broken link removed**
You didn't mention type of battery or circuit so we're flying blind..If your circuit has an on board voltage regulator the charging voltage shouldn't be an issue...

 

[gerty]

Here's a simple circuit: **broken link removed**
You didn't mention type of battery or circuit so we're flying blind..If your circuit has an on board voltage regulator the charging voltage shouldn't be an issue...

 

[gerty]

whoops!!!

 

[DigiTan]

Heh heh. Someone's gunning for that record post count! Anyway, Ralph Tenny from DPRG has a good NiCad-charging device at: **broken link removed**. There is also a miniaturized 50mA version in the App Notes section of National's LM317L Data sheet.

 

[2camjohn]

Guys,

Tts a NI-MH battery.

Does that make any difference?

Thanks

 

[Johnson777717]

Here's a good tutorial on NiMh batteries, and charging characteristics, for a "behind the scenes" approach to NiMh charging. Good stuff.

**broken link removed**

Also, here's an article on battery chargers which should help to explain some theory behind battery charging:

**broken link removed**

I hope this helps.

 

[2camjohn]

Those links are full of useful information, perhaps too much.

I only want a simple trickle charge circuit that works with NIMH batteries.

A super automatic switch mode ten stage charger that makes your dinner and does the dishes afterwards would be nice, but im restricted for space

 

[Johnson777717]

A super automatic switch mode ten stage charger that makes your dinner and does the dishes afterwards would be nice, but im restricted for space

Heheheheh Sorry for the overload.

If you find a schematic for one of these chagers, let me know, I'd really like to make one... :wink:

 

[2camjohn]

If i find one of those circuits I will sell it myself and make a fortune!!!



Now if anyone can point me in the direction of simple battery trickle charging circuits I would be most grateful.

 

[Nigel Goodwin]

Now if anyone can point me in the direction of simple battery trickle charging circuits I would be most grateful.

Just a single resistor off a higher voltage supply, calculate the resistor value using ohms law - that's all you require for a trickle charger, and is what you will find in most commercial chargers.

 

[2camjohn]

Thanks Nigel,

So for a 6.0V 1000MAH NI-MH battery what kinnd of current is good for trickle charge? (max discharge is < 1amp)

Cheers

 

[Nigel Goodwin]

Thanks Nigel,

So for a 6.0V 1000MAH NI-MH battery what kinnd of current is good for trickle charge? (max discharge is < 1amp)

Cheers

I would suggest something like 50mA - 5% of the battery rating.