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# Nicad Battery Charger ( LM317T)

2016-05-10 10:09
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This article describes the Nicad Battery Charger (LM317T). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: LM317T.

Here is circuit Nicad Battery Charger. It use IC LM317T ( Hot IC) Control Current less 300mA, Size battery 2.4V,4.8V,9.6V.It Low cost circuit.
This is a NiCAD battery charger circuit. High-quality, Not necessary to have a full charge and cut, Because this circuit charges with constant current and voltage regulated. But this circuit is not difficult and cheap.

The basic principles of a NiCAD Battery charging. There are a number of ways, as follows.
1.A constant current.

The Nicad battery can provide current 500mA-hr charge rate that is 1/10 of the current capacity. Therefore should be charged with a constant current 50mA for 10 hours, but actually want to charge for 14-16 hours because when near full current to charge less. So lasts longer.
- In the NiCAD battery charger for fast charging current to about 100mA charging rate for 3-5 hours. But it has the disadvantage of charging, when the battery is fully charged, it must be removed, otherwise the chemical substances in the battery will be very hot and damage.
- But a slow charger will not do, because it can withstand heat.

Example three circuits with this technique:

## 1. Ni-cad battery charger with DC power supply 9V

The Ni-cad battery charger circuit can be used with the battery will charge with 4.8Volt current 800mA using it for about five hours, “which serves R1 limit the current flow.
To the Ni-cad battery charger circuit where the R2 and LED1 is told that the state of the battery charger that fully or to show that if LED1 on battery power is not full.

## 2. Nicad Charger by IC CA3140E

This is easy circuit charger batt Nicad. For batt 1.2V.
When you have NiCad Battery should want to have Battery Charger Circuit. I begs for to advise NiCad Battery Charger this , because of build easy. With the integrated circuit number CA3140. Use the techinque Charger by current be stable.Make the electric charge well. But take time long little ago. however this easy good circuit sir.

## 3. Constant current nicad battery charger

Normally ni cad battery often apply current be stable charger. This circuit was designed go up for use to do battery package aforementioned a kind cell 1.25V x 4 amounts are group model AA that 50mA or cell 1.25V model C that 250mA by build serial. And can fine decorate other value get easy. Follow the circuit resistor R1 and R2 use fine output voltage. While have no load appraise 8V current output railings will flow through resistor R6 and R7 any one. And when there is the size increases transistor Tr1 as a result quietly work, make at the dot Y have tall go up. Be TR2 work and dot Z be add less. It make output voltage decrease lower and trend reduction until equilibrium point value filtration of resistor R6 and R7 the that. Must live the experiment thus then must use amp meter just rightly.

2.A constant voltageorFixed voltage regulator
The NiCAD battery, each battery has a voltage 1.2V, when it is fully charged voltage 1.25-1.3V. Therefore, we are charging a battery, the plus the voltage additive, such as 4 pieces, then the charging voltage 1.2×4 = 4.8V. But the charge like this, at first, a very high current flow. So, the voltage between NiCAD battery charger and very different, may have caused overheating and damage.

3.The Current and Constant voltage.
Like this charging, devices little more than the two first, but high quality. The safest way, and the battery the voltage is required by the specifications. When fully charged, the charger can be left in, because there is no current flow, Because the the voltage between the battery as well.
- I so chose the charging current and Constant voltage.

A constant current.
I am using LM317 as a constant current. Determined by the R6. In the circuit be defined output current (Iout) is about 50mA. If you want to current different from this, you can find out the R6. = 1.25V / Iout
this circuit is designed for charging multiple pieces. So it can select multiple the voltage levels is S1.
- 3.1V be applied to 2 battery (2.4)
- 5.5V be applied to 4 battery (4.8V)
- 10.3V be applied to 6 battery (9.6V)

Which we use Q1(C1061),Q2(C1815) And other equipment. Included circuit is maintained at a constant voltage. LED1 is used for the power on. T1 transformer size is 300mA.
The other parts please look in the figure circuit.

How to build.Friends can place the part in perforated board. Because this circuit has a few devices. You should check diagram well before use charge battery. Good luck.