Solar power night light design

How does a solar night lamp work?

This solar night lamp will illuminate an LED automatically during evening, and switch it off during dawn break, all automatically. The unit will also charge a in-built Li-ion cell safely.

Can a solar night light charge a Li ion cell?

The unit will also charge a in-built Li-ion cell safely. Equipped with double power sources, the solar night light circuit contains a solar cell with a maximum output voltage of 6 V and a Li-Ion cell with a voltage in the range of 3.7 V to 4.2 V. Three out of four electronic switches in a 74HC4066N (IC1) regulate the operation of the device.

How to prevent overvoltage charging of solar nigh lamp?

Overvoltage charging is prevented by Zener diode D4. If you’re not using the solar nigh lamp circuit for any reason, switch S1 comes in handy to open the connections and prevent the battery from being discharged. LED Amplifier Circuit

How do I fix a light that won't charge at night?

If everything is correct the circuit switch on the light at night and switch off and charge at the battery at day time. Just fix everything on a safe place and it work automatically if you want more powerful light just replace 12V LED with a 12V relay and connect that relay to ac power sources

What are the benefits of solar light bulb?

1. Improves literacy: Solar light bulb improves literacy because people can read after dark more easily than they can by a candle or kerosene lamp. 2.Saves Energy: As the light is the bulb is charged through solar energy (free energy) it saves energy. 3. Reduces air pollution: The use of solar light bulb decreases the amount of local air pollution.

What happens if a solar cell is plugged in at dusk?

At dusk, in the event, the voltage delivered by the solar cell decreases 1/3 of IC1’s supply voltage (around 1.3 V), switch IC1a gets opened and the ‘Charge’ LED becomes cold. The voltage at the control input of switch IC1b dips to zero causing it to open.