Any one know the Circuit for China rechargeable LED lamp

[robotsmani]

Hi,

Is any body know the circuit diagram for this China rechargeable LED lamp
Rechargeable energy 19 Led light products, buy Rechargeable energy 19 Led light products from alibaba.com

thanks

 

[mvs sarma]

it is current controlled boost regulator led driver. many leds are connected in series and trhee or four such series chains are paralleled. Microchip has an application note. later dedicated chips came up

 

[robotsmani]

thanks sarma...

I opened and saw that it is having one SLA battery(rechargable), one big poly cap, some rectifier and filter, one 1/2w resistor for current limiting to the 4v SLA battery, one npn transister for switching (automatically switch on when power cut happens) . I need a circuit diagram for this

 

[mvs sarma]

that is a crude design as it sounds. today i went to market to fetch one but no stocks. They had 23 LED ones only.
Perhaps it would be asy to makeout the schematic unless some Microcontroller is involved.