6/12 Volt Lead Acid Battery Charger

lead acid battery charger

This 6/12 Volt lead acid battery charger circuit provides an initial voltage of 2.5 V per cell at 25°C to quickly charge a Lead Acid battery. The charging current reduces as the battery charges, and when the current drops to 180 mA, the charging circuit  reduces the output voltage to 2.35 V per cell, leaving the battery in a fully charged state. This lower voltage helps prevent the battery from overcharging, which would shorten its life.

The LM301A compares the voltage drop across R1 with an 18 mV reference set by R2. The comparator’s output controls the voltage regulator, forcing it to produce the lower float voltage when the battery charging current, passing through R1, drops below 180 mA. The 150 mV difference between the charge and float voltages is set by the ratio of R3 to R4. The LED’s indicate the condition of the circuit.

Temperature compensation helps prevent the battery from overcharging, especially when a lead acid battery undergoes wide temperature changes while being charged. The LM334 temperature sensor needs to be placed close or on the battery to reduce the charging voltage by 4 mV/°C per cell. Because batteries require more temperature compensation at lower temperatures, change R5 to 30 for a tc of -5 mV/°C; per cell if application will spot temperatures below – 20°C.

The Lead acid battery charger’s input voltage should be filtered do that is at least 3 V greater than the highest needed output voltage: around 2.5 V per cell. Select a regulator for the highest current needed: LM371 for 2 A, LM350 for 4 A, or LM338 for 8 A. At 25°C with no output load, change R7 for a Vout , of 7.05 V, and change R8 for a Vout of 14.1 V.

Power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.

Tags: 12 Volt Lead Acid Battery charger 6 volt Lead Acid Battery charger Lead Acid Battery charger circuit Lead acid charger

Related Post "6/12 Volt Lead Acid Battery Charger"

Universal Battery Charger for Charging up to 18V Cell
This universal battery charger has regulated output
Self Powered Battery Tester
This self powered battery tester circuit runs
Versatile AA-Cell Battery Charger
This is the circuit design of AA-Cell
Electric Car Battery Charger
This is the scheme diagram of electric

Comments are closed.