The Simplest Rechargeable Battery Circuit (and Save the Planet Too)!!!

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Introduction: The Simplest Rechargeable Battery Circuit (and Save the Planet Too)!!!

Hallo to all.....

The idea came to me when i was ready to replace a battery cell in my alarm clock next to my bed. Even i am using the last 5 years only rechargeable batteries of the most types i considered how many battery cells people around the world throw away in a simple move like that i did now.....How meny disposed battery cells thrown away in each household? Who knows? But what if we had a rechargeable system to recharge batteries when the device is connected to an outlet and when we will need the battery (In a black out) this will continue working the device.So first we will have power continuity, second we will save money buying and dispose all the dead batteries, and third under normal conditions we can rechargeable any type of battery we like. My next question to my self was that this kind of circuit must be simple, cheap, realible, and easy convertible to recharge any battery cell and giving power to a device at the same time. SimpleEhhh????

So i tried to recall my studies from university and i reminded a very simple circuit which actually recalls all the science of electricity and every 1st year stuedent knows well.

Materials..... Cheap and Easy

>>4 diodes of 1N 4001 type for making the bridge which conncects to the transformer
>>a transformer 2x6 if you want to recharge batteries from1-6VDC or 2x12 for devices up to 12VDC (input 220VAC europe output 2x3,2x6,2x12 choose your one)
>>a 1000uF Capacitor, using it as a filter and elevator of the power
>>a Relay (6VDC if you will give power from 1-6VDC or a 12VDC if you like to recharge a 12VDC battery)
>>a resistor of 33 or 39 Ohm /5W (5W is ideal because the resistor cool down faster)
>>a diode of BY251
>>2 rca female for chassis
>>2 rca male
>>a prototype card or a perforated card, no PCB needed
>>a nice box for the battery recharging docking station appx12cm X 5cm X 3 cm ( in this box you will try to fit a transformer, the basic circuit , cables, the battery nest and your spirit! :D

All materials costed to me 12euro (15USD) The most expensive is the transformer.
Lets go now at the circuit design and i will explain to you....

Step 1: Explaining of the Circuit

Ok....now lets go to explain all theese Chinese things!
first of all the circuit is well separated is two sections the power supply on the left (green line) with the battery pack and the outline with the purple line

We take the transformer (220V europe make the calculations over Atlantic reader) and we connect it in a formation of diodes called bridge.This circuit is what a first year student learns and remember it for ever. Its the simplest circuit to achieve best reults, cheap and realible.Ok, if u like to transform from AC to AC again then the circuit remains the same u change the diodes of type 4402, 4403, 4002, ofcourse the transformer and the appropriate relay working in AC. The capacitor of 1000uF value is a filter and a choke to elevate the power. Connect the diodes to the capacitor and then this one at the line of the relay. Then the + pole of the device gets to the switch of the relay. At the + pole of the device we attach a diode or a BY251 and a resistor 33Ohm of 5 Watts (we prefer 5watts so the resistor isn't get hot when it works and cools down faster)

You will not need any PCB. Take a protorype or better a perforated card and just place the materials and do the connections. No particular attention needed (of course take all the precautions when using high voltage such as 220VDC are able to fry you in seconds and send next to your anchestors for ever)

from the + and - we will take line and we will drive it to 2 RCA female (chassis) The one male RCA connected here goes to the charge the battery and the other goes at the device where we will place a fake battery

Step 2: The Final Product....

So....please drop the soldering gun and pass me your work......hehehe......my beautifull years in University...Lets see what we got. Ok about the soldering and the connectrions even a 5 year boy could do it.....lets proceed to refine the product......Dont forget the purpose. Is to place a rechargable battery of any type, using a power supply instead the battery and if the years of darkness come we will use the rechargeable batteries......neet?

Of course u have a rechargeable battery (AA,AAA, any type even 6V). We will build a charging docking station for batteries and also we will make a fake one (battery) for the supplied device (clock etc) the fake battery i made it is wooden!!! with metal edges connected to - and + cables.

take a piece of wood and cut it till be a cilinder of the shape of the battery type you want...(AA,AAA).open a hole in the center of the wood and pass the 2 cables for + and - poles. At the end of every poly attach a bronze wire formating the - and the + pole.

Now connect the two edges of the cables coming from the wooden battery to a male RCA coneccting to a female RCA placed on the docking station. With that way goes power from the 220VAC to the wooden battery. Now place the wooden battery in the device you want (Clock).

At the docking station you have placed a battery charging nest of any type. Take 2 wires and connect one the + and the other to - pole of the nest and the other edges connect them to a male RCA connected to the one of the two female RCA's

U are ready my boy.....and be proud of it......That's it guys. Save the planet with less disposable batterries, recharging your battery cells for your clock, mouse, etc and when the end of the world comes you will be well prepared...........neet???

Good luck my friends.....please before go take a look of my pic and admire me...Don't Forget to Vote me for the Green Contest...........Thanks all voters

C u around all

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27 Comments

What is that re2 in the circuit
Symbol shows an inductor but doesnt understood why

Hallo friend,

1. Re2 is the relay for NC/NO contacts....the inductor is not something else than the inductor of the realy....In schematic just shown any functionl part of the circuit. Also this circuit is given as initial way to think about the abilities of this.

2...hahaha you may have right but when i made it I wanted to make you undesrtand that this circuit can charge any kind of batteries.

3....Yes of course. So forget the tranformer, the bridge and the filter and add the output of the charger in serial with a diode (or LED) and then to rellay. Be sure the charger pack gives you STABILIZED power......

Can i replace that left side circuit with a dc mobile charger ?

And what are those
Huge batteries connected down the cicuit
For ?

And what are those
Huge batteries connected down the cicuit
For ?

Charging happens when the relay is energized and the power comes in from the right side surrounded in Purple. Probably a switching power supply or other regulated (or not) DC supply. If you put a tap in there, when the power went off the batteries would supply the load making a slow UPS.
This circuit needs work though to do that.
A circuit very much like this one was written up in QST Magazine and it is used to provideemergency power to Ham Radios when the lights go out.
73's

hi dr bill.. where can I find this circuit you mentioned from magazine? I need a circuit to do just that!

QST magazine is put out by ARRL for Amateur Radio Operators.

I found this schematic in QST as part of an article. The circuit is slow because of the relay. The schematic is done in TinyCad, a versatile free cad program from SourceForge.

Becomes an Uninterruptable Power Supply when a power supply and a battery are attached.

UPS.png

Hey there. Can i simply replace a supercapacitor with a rechargeable battery? Or i must make some modifications? Thanks

This is a very 'nice' simple circuit. It would have been even better if there was some sort of connection between the bridge and the battery! But hey ho! we can't have everything.