The overcharge protection is already built into your phone. There's no external access to the battery or this protection, thus no way to access the information needed to provide the indication you desire. [unless the RFI that is generated by the phone's charging circuit can, in some way, be interpreted to provide this information.]
Addendum: All an external phone "charger" provides is a source of 5Volts with enough current to power the charging process. If you want to do this with 6 volts, then the 7805 is the wrong choice as it's dropout voltage is around 2V which will drop that 6 Volts down to around 4 Volts. What you need is a Low Drop Out [LDO] regulator such as the TA48M05F.
Ahh, sorry about that. Then you need to research "NiMH fast-charge management ICs" or "NiMH Battery Charge Contoller ICs" as well as a "Battery Level Indicator IC" Or in general, "Battery Management"
You can also change "IC" to "Circuit" for another set of results.
Hello to all, I decided to do small project but before noticed it, It became nightmare because of my immatureness.
Okay this was my small project. I wanted to build external battery for my mobile phone (I know there are a lots off such devices on the market, but I wanted to get experience with this project) I decided to go with 5x AA Sanyo eneloop batteries total voltage 6V (they are Ni-MH rechargable, each one 1.2v)
My phone accepts 5V on USB B plug.
For charging this batteries I will be using my phone charger through IC 7806 (which will step up 5v to 6v)
but for charging my phone from this device I will be using IC TA48M033F (which will step down from 6v to 5v)
problem which I have is I need schematics 1. overcharge protection for external battery itself . and 2. charge meter for external battery itself [for this I have 5mm RGB LED I am thinking (red=low charge, green=okay charge, blue=good charge and white=perfect or overcharge) or (red=low charge, yellow=okay chage and white=good charge)].
Linear Technology has many many different battery charging solutions. This particular charger is a demo board already assembled and fully functional. It has two chargers, one that boost up say 5V to 6V, and another on that drops down say from 6V to 5V.
It does not need overcharge protection external because that is all built in when you select the battery type. It also has status indicators that tell you when the battery is charged. It doesn't have a ,"Gas Gage," per say, although they have functioning demo borads for that if you really want one.
The deal with this is that it is already designed & built, has schematics, part values the whole 9 yards.
To add... when I researched this very thing a while back, I was unable to find an IC that did both battery fast-charge management AND battery charge level monitoring. There are ICs for each function, but I wasn't able to find a one-chip-does-all solution.
The discussion centers on designing an external 6V NiMH battery pack using 5x AA Sanyo Eneloop cells for mobile phone charging, with a focus on implementing overcharge protection and a charge level indicator using an RGB LED. The original plan involved using a 7806 IC to step up 5V USB input to 6V for charging the battery pack and a TA48M033F regulator to step down from 6V to 5V for phone charging. It was clarified that overcharge protection is not accessible from the phone itself and must be integrated externally for the battery pack. Recommendations include researching NiMH fast-charge management ICs and battery level indicator ICs or circuits. The 7805 regulator is unsuitable due to its dropout voltage; a low dropout regulator (LDO) like the TA48M05F is preferred for maintaining 6V output. Linear Technology’s LTC3558 demo board was suggested as a ready-made solution offering boost and buck charging with built-in overcharge protection and status indicators, though it lacks a full battery gas gauge. It was noted that no single IC commonly combines both fast-charge management and charge level monitoring for NiMH batteries, so separate ICs or circuits may be required. Battery University was recommended as a resource for charging principles. Summary generated by the language model.
