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    Problem with 230v LED Driver circuit

    I have been trying to make an AC LED lamp consisting of 44 LEDs. The LEDs are rectangular and give out a bright white light. I am not sure of the current of the LEDs and so have been trying different driver circuits to drive the LEDs. I tried the following circuit but the LEDs were dim. Can someone tell me what's wrong with the circuit?

    white-led.png

    •   Alt21st October 2012, 10:51

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    Re: Problem with 230v LED Driver circuit

    It seems your current is too low. Replace the 220nF capacitor and place a 1uF one. You may require to add another capacitor in parallel if the light intensity is not desirable.
    Wading all day.....


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    •   Alt21st October 2012, 12:12

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    Re: Problem with 230v LED Driver circuit

    What is the rated voltage of the LED's?



    •   Alt22nd October 2012, 03:46

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    Re: Problem with 230v LED Driver circuit

    The bright whites that I'm familiar with are rated 3.6V at 20 mA.

    It's a good idea to include a resistor to limit inrush current on power-up. 330 ohms should be sufficient. 1W rating.

    I've made a simulation showing how you could drive these from 230V mains AC.



    The smoothing capacitor will acquire upwards of 180 V and must be rated higher than that. Its value is not critical.

    A 470 nF dropping cap appears sufficient to obtain 18 mA through the led's.
    If you are certain they can tolerate 25 mA, then try a 680 nF.
    Or a 1 uF if they are they kind that can tolerate 36 mA. Then the inrush resistor is carrying 3W peak.



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    Re: Problem with 230v LED Driver circuit

    Thx its helpfull working...
    LEDdriver6img.png
    Last edited by sandeep2506; 23rd March 2014 at 14:04.



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    Re: Problem with 230v LED Driver circuit

    Thanksssssssssssssssssss



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