The following Li-Ion battery charger circuit very efficiently follows the above conditions such that the connected battery is never allowed to exceed its over charge limit. 6 Volt Battery Charger Automatic Battery Charger Battery Logo Battery Hacks Arduino Hobby Electronics Electronics Projects Electronic Packaging Diy Tech Intelligent Battery Charging [Razor] shares with us the plans for an intelligent battery charging circuit. All battery circuit including battery charger wiring diagram. Upper and lower voltage limit (UL & LL) potentiometers provide full control of the On /Off voltage thresholds thus preventing both battery overcharging and over-discharging. Most of the lead acid batteries in the market are 12V batteries. We use the concept of the circuit: not using ICs and complicated devices. DC voltage thus available is split into two: one for charging the 12V battery (BATT.1) through IC1 and the other for power supply to Arduino (Board1) through IC2.

Simple Automatic battery charger circuit. 1: Circuit diagram of automatic battery charger When AC mains power is on, step-down transformer X1 generates about 15V AC and converts it to above 18V DC after rectification and filtering. Use existing products to use more benefits. The Ah (Ampere hours) of each battery may vary based on the required capacity, a 7 Ah battery for example will be able to provide 1 Amps for a duration of 7 hours (1 Amps *7 hours = 7 Ah).
When the IC 555 is used as a comparator, its pin#2 and pin#6 become effective sensing inputs for detecting the lower and the upper voltage threshold limits depending upon the setting of the relevant presets. Just have to understand Battery charging requirements only. We can use this circuit for all battery. Fig. This External Battery Charger Control applies line power to the motor of a 1kW motor-generator set via a high current relay contact.

For example, if a battery is connected to JP1-JP4 pins then the current that flows cause a voltage drop to R1, then D1 causes a voltage drop of 0,7 volts and ?1 conducts.

It is designed for 12V batteries. NiCd – NiMH Battery Charger circuit diagram The charge will start if a battery is connected between pins JP1-JP4 or JP2-JP4 or JP3-JP4.
Let's start by understanding few basic things about a Lead Acid Battery so that we can build our charger more efficiently. This is the first automatic battery charger circuit.