The input stepped down ac is full wave rectified through the diodes d1 d2 and supplied across the scr anodecathode terminals.

Scr battery charger project report pdf. It is an automatic system with which charging a battery up to 12 volts rating is very easy. Related post lead acid battery charger using lm317 3battery charger using scr. The device is appropriate for 12v sealed lead acid batteries since these batteries are chosen because of usage frequencies. The features of devices are as follows.

It is solid state equivalent of gas filled triode and has around four semi conductor layers. The working of the above scr controlled battery charger can be understood with the following explanation. Assuming we are connecting a discharged lead acid battery. Batteries with different potentials like 6v and 9v can also be charged by choosing appropriate components.

The working of the circuit is as. Scr has three pins anode cathode and gate as shown in the below figure. The aim of project is to design automatic battery charger. It is made up of there pn junction diodes also.

Download fabrication of an automatic battery charger using scr electrical and electronics engineering eee final year project report. A simple battery charger based on scr is shown herehere the scr rectifies the ac mains voltage to charge the batterywhen the battery connected to the charger gets discharged the battery voltage gets droppedthis inhibits the forward biasing voltage from reaching the base of the transistor q1 through r4 and d2this switches off the transistorwhen the transistor is turned offthe. Then when the circuit is powered on the peak ac voltage at the anode of the scr1 would be 21v 15v rms. Designing the whole circuit depends on the kind of battery used to be recharged.

Suppose we are using a 6 cell 9v ni cd battery with an ampere hour rating of 20ah and a single cell voltage of 15v. In this project automatic battery charger using scr as an electronic thyristor is used to control the charging system. In the battery charger using auto dry battery charger using scr circuit above wanted to clarify regarding the maximum current which would pass through scr1. It can be used to charge 12v batteries.

So if you want to charge the battery with the ac power source then the following steps we need first of all to limit the large ac voltage to perform you need to filter the ac voltage to remove the noise regulate and obtain a dc voltage and then give the resultant voltage to the battery for charging. The battery which is under charging can be seen in series with the cathode terminal. Besides the device appropriate for diffrent current values which are 12 ah 4 ah 7ah and 12ah. Battery charger circuit using scr introduction to scr.

The battery is charged with a small amount of ac voltage or dc voltage. Scr is abbreviation for silicon controlled rectifier.