Led Solar Lawn Lamp Driver Ic

Solar garden light circuit.

Led solar lawn lamp driver ic.

It offers the advantages of low power dissipation low minimum operating voltage and automatic dusk to dawn switching. Add the battery and the solar cell and you have a solar light. 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 yx8018 comes in a 4 pin transistor style to 94 package and the pin.

So we can add to that circuit the simple joule thief voltage booster to get a good design for a solar garden light. The complete circuit is shown in figure 2. It requires only an external inductor to construct a boost power supply with over 90 per cent efficiency. The solar lawn lamp mainly uses the energy of the solar cell to work.

It boosts 0 8 2v to drive white leds or other colors with 85 90 efficency. 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. This outdoor led solar garden lights project is a hobby circuit of an automatic garden light using a ldr and 6v 5w solar panel. When the daytime sunlight is irradiated on the solar cell the light energy is converted into electric energy and stored in the battery and then the battery is provided for the led light emitting diode of the lawn lamp at night.

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. 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. 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.

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. Using the solar light ic all you need is the solar ic an inductor and the ultra bright led to make the circuit.