I am using 12V 7.2Ah Amaron Quanta lead acid battery for an Emergency Lamp. I am using the following charging circuit which is attached with this post. In this charging circuit, 230 ac voltage is given as input to the 16-0-16 transformer. The output of transformer is filtered through rectifier diodes and then given as input to the LM317 of charging circuit. As of now transformer is needed to step down the ac input voltage. I need a charging circuit without a transformer converting 230V AC to 18V DC. So kindly suggest me a circuit which consists of input rectification without a transformer. Please suggest it with a moderate cost. And also I need one more clarification. I am using "Constant Voltage" - trickle charging method to charge the battery. I am using a load of 2 lamps of total 110 W lamps which stand for around 50 minutes of full charged battery. The lamps will cut-off at 9.5-9.8 V. Then it takes around 16 hours to make the battery full charge. Could you please confirm me if I can charge the battery soon (min 6 hours). Is so at what rate I should use the load. Please help me in this situation.
I see a transformerless power supply in your website. Kindly suggest me like a circuit supporting charging circuit without transformer at input side.
If you not able to find the attached link for charging circuit which I am currently using, pls find the following link
Have a look on Ebay for an 18V switch mode power supply. You will be able to buy one far more cheaply than buying the individual components and making one up for yourself.
Thanks for your valuable reply pebe. I can understand your suggestion sir. I looked Ebay for power supplies and battery chargers. It will be helpful if i get a charging circuit without transformer so that I can attach the load and the battery to that charging circuit. I want to convert the charging circuit to a compatible pcb. Please suggest me a charging circuit without transformer pebe.
Unless you are experienced with electronics, it could be extremely dangerous to play around with the lethal voltages encountered on the household supply.
need charging circuit for12V7.2Ah lead acid batery
Posted - Jul 13 2012 : 07:13:22 AM
