Charger Circuit

[monkeymagic]

hiya

I purchased this portable dvd battery it for the venturer line of dvd players

Link

I opened it and its those longish lithium batteries that looks like 4ass bundled in blue plastic I hope the protection IC is built in as I like my hands

This how Im planning to wire it up



I know its hard to see the yellow dot is the 9v dc in the box on the left is the dc dc converter how do I wire it I put in + - coming out +tive 3.3v goes to N64 where does -tive go?

So how does it look have I drawn up the plans for a lithium bomb or a n64

[SpearMan74]

Use periods when you type. Just saying.

[Skyone]

Ground (-tive?) goes into the regulator aswell. The diagram just does not show. Also, when posting long links, do this:

Code: Select all

[url=http://longlinkgoeshere.com]Click here![/url]

Looks like:
Click here!

[monkeymagic]

hiya

sorry about the previous post was at work

what I'm mean is i connect the dc/dc regulator to the 7.4v line and the ground line

at the other end of the regulator i get red 3.3v line and a black one should i connect the black one
back to the main ground line?



heres another crappy pic

[Skyone]

Might as well connect that ground to the N64. Remember this though: 'ground' is a universal word. All grounds in a circuit are connected. There shouldn't be a ground output on the regulator, there never is.

http://skytroniks.com/images/sj3.jpg

There's an example. Look at the 7805 5 volt regulator, ground is connected to it, the battery and the components. 4 places.

So just supply all components with ground, it doesn't matter where the ground is from, for all grounds are the same.

Skyler

[monkeymagic]

so i wouldnt get no noise on the ground? excellent thanks for help

now to charge my battery while playing shall I just wire up 9v dc up to the circuit

see that yellow dot in my first psot that where I plan on putting 9v in

hows it look

thanks for the help guys

started work on n64 yesterday but im having trouble removing the power socket with the crappy 15watt iron the store clerk convinved me to get over my 28watt one

doesnt melt the solder at all the pins are drawing away the heat wheres that blowtorch

[timmeh87]

you cant just hook 9v up to a lithium battery like that. sure, the protection circuit *might* stop if from blowing up (if it has one) but it also might not.

the protection circuit just cuts off the power based on voltage. for the chip i used in mine, thats 4.35v per cell. but i was taught that anything above 4.2 is dangerous. also, as you get past about 4v you need to taper off the current, you cant just keep pumping it in at full blast. the protection circuit does not even check for this.

so anyways, charging a lithium battery and using it at the same time is a bit tricky. unless theres already circutry on the battery pack that takes care of it. i didnt read actually read most of the thread. if thats the case you should be ok, just make sure you know what youre doing.

[monkeymagic]

mhh i thought 9v might be too much i reckon charging circuitry is built into the dvd player

i suppose ill have to isolate the battery with a switch so i can choose weither to Battery/DC/Charge

seems so unelegant

[Skyone]

Ugh. Usually all DVD batteries have integrated charging components. I have an 8.4v DVD battery, and it take in ~9v input off any wall charger and charges. As you can see here, it's the same battery but with a wall wart charger!

Conclusion: All DVD batteries have integrated chargers.

[monkeymagic]

so how do you know when its charged?

[Skyone]

so how do you know when its charged?

You don't. NiMH (DVD batteries) are pretty much protected to overcharge.

[monkeymagic]

the battery is a lithium ion battery

[timmeh87]

Conclusion: All DVD batteries have integrated chargers.

wrong. the charger could easily be integrated into the main circutry of the dvd player itself, thus lowering the production cost of the battery.

[Skyone]

Sorry, I meant EXTERNAL DVD Batteries.

[monkeymagic]

its is an external dvd battery but its lithium ion