Joule Thief Brings Dead Battery Back to Life

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1d 00:58:50

This is a Joule Thief circuit that step up a 0.5V dead battery to 2V constant DC voltage in order to drive a 10mA 2V led...!!!
In the example I took into consideration and the internal resistance of the battery.

published 11 years ago

petrovich

11 years ago

Good. By adding 1 transistor and 1 resistor you can achieve current stabilisation

Zafeirakis

11 years ago

You are right but I don't want to compromise the efficiency of the converter...

rmbrusvil

11 years ago

If you change simulation speed, give me Solution error. But if you put some little resistor n serie with LED. Error solved.

Zafeirakis

11 years ago

@rmbrusvil thank you for your advice...I put an inductor in series with the LED instead of a resistor, because I wanted a non energy dissipating component in order to keep the efficiency of the converter high...By doing that I believe I have fix the error end also improve the output voltage ripple...

Zafeirakis

11 years ago

Btw efficiency is about 70%...

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