SIMPLE 6V BATTERY GUARD CIRCUIT DOWNLOAD

Adjust VR2 to read 14.1V at test point TP2. Adjust potmeter VR1 to read 0.5V (difference of 14.1V and 13.6V) at test point TP1. Adjust potmeter VR3, so that LED2 begins to glow. While setting the charging voltage, remove the jumper and connect it back after calibration.įor initial setup, remove jumper J1, switch off S2, switch on S1 and adjust potmeter VR2 to get 13.6V at test point TP2. Jumper J1 is used for calibration (set-up). Capacitor C4 should be as near as possible to pin 1 of IC2. LM358 is a dual-operation amplifier that is used here to control overcharging of the battery. The basic circuit is a regulated power supply using LM317, with a control on output by changing resistance at adjust pin 1. This voltage is given to the input of LM317 for regulation. The 230V AC primary to 15V-0-15V, 1A secondary transformer used in this circuit steps down mains voltage, which is rectified by diodes D1 and D2 and smoothened by capacitor C1.

It is built around step-down transformer X1, adjustable voltage regulator LM317 (IC1), op-amp comparator LM358 (IC2) and a few other components.

12V battery charger circuit Fig1: 12V battery charger circuitĬircuit diagram of the 12V battery absorb and float charger is shown in Fig. These values are to be set as specified by the battery manufacturer. For safe working and to avoid overcharging of battery, absorption voltage is selected as 14.1V and floating voltage is selected as 13.6V. Absorption and floating voltages are dependent on the type of battery.įor this charger, voltages are set for a sealed lead-acid (SLA) 12V, 7Ah battery, for which absorption voltage is 14.1V to 14.3V and floating voltage is 13.6V to 13.8V. This 12V battery charger circuit charges the battery at a particular voltage, that is, absorption voltage, and once the maximum charging voltage is attained, the charger changes the output voltage to float voltage for maintaining the battery at that voltage. Standard NiCd cells charges at various rates: a quick charge of high current, or overnight with low current.Most battery chargers stop charging the battery when it attains its maximum charging voltage set by the circuit.Rechargeable nickel-cadmium (NiCd) batteries are broadly utilized in consumer gadgets due to their high energy density, long life, and low self-release rate.Utilize a good heatsink with transistor 2N3055. Therefore, the transistor 2SC36522 becomes in an ON state and supplies the current to transistor 2N1711 which will short the base of 2SC2270 to the ground and cut off the base current of 2N3055 consequently the way toward charging will begin. The 0.15 Ohms 3W resistor voltage will get 0.7V. Because of this, the charging current is regulated to 4 amperes so the charging current gets 4 amperes. This circuit has a built-in automatic current regulator. The circuit of the NiCd Battery Charger is shown above.

SIMPLE 6V BATTERY GUARD CIRCUIT DOWNLOAD

For a detailed description of pinout, dimension features, and specifications download the datasheet of 2N3055 2N1711 Pinoutįor a detailed description of pinout, dimension features, and specifications download the datasheet of 2N1711 NiCd Battery Charger Circuit Working Explanation

Simple 6v battery guard circuit