Chager circuit for SMF batteries

Posted on Feb 5, 2014

Here is a simple charger circuit for charging SMF(sealed maintenance free ) batteries. The charger circuit being curernt and voltage regulated, can be safely used to charge SMF batteries of 1. 2 AH rating. This circuit was actually designed in response to a request from a reader. With slight modifications you can use it for charging any sort of SMF bat

Chager circuit for SMF batteries
Click here to download the full size of the above Circuit.

teries. The first part of the circuit is the power supply made of transformer T1 and diodes D1&D2. The capacitor C1 filters the rectifier output. The next part is the section comprising of IC1 and Q1 which provides the necessary volatge and current regulation. The diode D3 prevents ther reverse flow of charge from the battery. R4 is the component that determines the charging current. Here it is set to be 120 mA. R4= (0. 6 V/Charging current). By selecting the proper value of R4 according to equation, you can charge batteries that require different charging currents.

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