Float Charger Circuit for LED
Hi Swagatam, I hope you and all are good.
I was wondering if you could offer some advice on a circuit. I have a 5 meter strip of 5050 x 300 leds 12volt 5A 60 Watts, that I have set up with a HC-SR501 PIR motion sensor and SLA 12 volt 7.2 Ah battery. The circuit is for the charging of the battery that would be connected all the time with mains supply to keep the battery topped up. The on time for the lights is around 1 minute.
Our mains here is 240V.
I have been looking at float charge circuits, but not quite sure if that is what I need.
In order to keep the battery always full charged and in a standby position, you can try the following circuit with a few modifications:
1) Remove all the 22K resistors and connect all the respective lines directly with the positive supply line.
2) Replace the mosfet with a TIP122 BJT.
3) Replace the pin#6 zener diode with a 10K resistor.
4) Remove the green LED/resistor, and connect only the LED in series with the transistor base.
5) Remove the 15V zener connected with the pin#7 of the IC
Use Rx = 0.6/0.5 = 1.2 ohm resistor, 1/2 watt...this will fix the float current to around 0.5A
Let me know if you have any more questions
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