Aug 18, 2009

Constant-Current Battery Charger

There are many ways of battery charging but constant-current charging, in particular, is a popular method for lead-acid and Ni-Cd batteries. In this circuit, the battery is charged with a constant current that is generally one-tenth of the battery capacity in ampere-hours. So for a 4.5Ah battery, constant charging current would be 450 mA. You can also Subscribe to FINAL YEAR PROJECT'S by Email for more such Projects and Seminar.

Constant-Current Battery Charger

In the above circuit, D1 is a low-forward-drop schottky diode having peak reverse voltage (PRV) of 60V at 5A or a 1N5822 diode having 40V PRV at 3A. Normally, the minimum DC source voltage should be ‘D1 drop+Full charged battery voltage+V DSS + R2 drop,’ which is approximately ‘Full charged battery voltage+5V.’


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This project also has Overcharge and deep-discharge protection. For overcharge protection Zener diode is used as shown in above circuit and for deep-discharge protection there is one more zener diode which drives the transistor connected to it. This circuit and product is from Electronics4u.com which is a good name in Electronics industry and provide good electronic resource too. Use this project only for your reference and study work.

Source: Electronics4u.com

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