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Rechargeable torch explaination

Discussion in 'General Electronics Discussion' started by Emon, Aug 15, 2017.

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  1. Emon

    Emon

    1
    0
    Aug 15, 2017
    Hello,
    I have a rechargeable torch light which turns on when a switch is pressed. Also there is a plug that is used for charging. When I put the plug in the wall socket the battery charges. While doing so if i press the switch on the torch light doesn’t turn on.
    But i unplug it then press the switch, the torch turn on. But the torch should turn on if the switch is pressed even if the plug was inside the wall socket.
    I've opened it and found that there is a plug connected to four diodes places as a beidge rectifier then a rechargable battery is connected and then the torch across it. And a switch is connected in series with the torch.
    I'm not understanding while the plug is inside the socket why the torch is not turning on if the switch is pressed?
    Please help.
     
  2. Externet

    Externet

    775
    168
    Aug 24, 2009
    It is a 'feature'
    The charge controller has an 'enable' pin that allows to charge only if senses it is plugged in, and disables the lamp turn-on switch. Otherwise, most of the wall power would be used to turn the lamp on instead of recharging the battery in short time.

    It is a rechargeable torch, not a wall illuminator.
    It could be possible to modify it, but the charging time can be much longer.
     
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