Automatic charger for motorcycle battery or car battery - Auto cut off charger - Fareedish's Blog

There are many types / types of chargers circuit on the internet, ranging from very simple to the most complicated.

But here I will make a cut off automatic battery charger that is designed very simply so that it is easy to build by anyone but functional. 

By using this circuit, you no longer need to worry about over charging because if the charging voltage has reached the specified limit of the circuit, the circuit will stop the charging process automatically. 

If the battery voltage decreases or wants to restart charging then a button is provided to turn it on. 

For installation, the circuit is first connected to the battery, then to the power supply (source voltage), the purpose is so that the voltage monitored by the circuit is the battery voltage at that time. If it is connected to a power source first, the circuit immediately cuts off the voltage because the circuit directly detects the source voltage. 

This circuit can also detect batteries that have been damaged or dry the electrolyte, namely when the circuit is given a source voltage, the circuit immediately cuts off the voltage! 

Read also : Membuat Inverter dan LVD sederhana

Here's the circuit.  

auto cut off charger.

-Update: Because it makes it difficult for many to find a 2N5401 transistor, it can be replaced with similar PNP transistors such as A1015 etc., and most of those who fail to make it because the transistor foot layout is different from the common one in the market. 

Note:

*) No battery = GREEN LED is on.

*) Charging process = RED LED is on.

*) Full battery = GREEN LED is on.  

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Update! [Sept 2018]

Because there are some who are still confused about the use of pnp-type Transistors and there are also those who have difficulty looking for a 13V zener, the circuit is slightly changed with the same function. And the cut off settings can still be flexible thanks to the addition of the trimpot.  

Read also : Membuat LVD Low Voltage Disconnect | Melindungi Baterai dari Kondisi Kritis

Transistors use the npn type and are easy to find in the market, the equation can use other types of npn such as C945 and others, as well as zener diodes using 12V ones. 

Check out the following test video, calibration and explanation 

Skema

Layout

Bottom layout

Download PDF format print-ready layouts

         Next version Cas Aki Otomatis

To prevent excessive battery use below the tolerance limit which will have an impact on battery life, it is necessary to add a Low Voltage Disconnect (LVD) circuit. 

Read the article here