You can make your own solar light or single battery led booster driver.
Led solar lawn lamp driver ic.
It requires only an external inductor to construct a boost power supply with over 90 per cent efficiency.
It boosts 0 8 2v to drive white leds or other colors with 85 90 efficency.
Add the battery and the solar cell and you have a solar light.
While the last circuit works well for driving a yellow or red led it runs at 2 4 v the output of the nimh battery it does not have sufficient voltage to drive a blue or white output led.
Ana608 is the core component of all solar garden lights.
It offers the advantages of low power dissipation low minimum operating voltage and automatic dusk to dawn switching.
During day time the internal rechargeable 6 volt sla battery receives charging current from the connected solar panel through polariy protection diode d9 and current limiting resistor r10.
Inside the example i deconstructed was a single 1 25 volt 100 mah aaa nicd cell and a small pcb with the led a 220 uh inductor and a four pin voltage boosting integrated circuit marked yx8018.
Solar garden light circuit.
Solar light ics are very handy they have the dark detection circuit and the voltage multiplying led driver built into one small four pin component.
However when salvaging the solar cell and battery from a cheap solar garden light to make a charging circuit i realised the electronics are in fact a simple led driver.
The complete circuit is shown in figure 2.
So we can add to that circuit the simple joule thief voltage booster to get a good design for a solar garden light.
Using the solar light ic all you need is the solar ic an inductor and the ultra bright led to make the circuit.
The solar lawn lamp mainly uses the energy of the solar cell to work.
Ic cl0116 lamp controller is an application specific integrated circuit asic in which solar charging and led driving sections are integrated on the chip.
To run a led from single 1 5 v 1 2v or in particular largely depleted batteries the famous joule thief circuit using a coiled toroid is great.
A solar garden light circuit.
