1. The basic principle of solar flashlight
Sunlight shines on the semiconductor pn junction of the solar panel on the surface of the flashlight to form a new hole-electron pair. Under the action of the pn junction electric field, holes flow from the p region to the n region, and electrons flow from the n region to the p region. A current is formed after the circuit is passed. The current is stored in the battery. When the flashlight is needed, the circuit is turned on to drive the LED to emit light.
2. Structure of solar flashlight
The appearance and structure of a solar flashlight are similar to those of a general flashlight. The outer wall of the handle is usually equipped with solar panels, and some of them are also made into a flashlight for both battery and solar energy. The main components are solar panels, batteries (usually used lithium batteries), LED drive circuits, LED bulbs.
3. Features of solar flashlight
The solar flashlight has the characteristics of novel structure, small size, light weight, high brightness, long lighting time and convenient carrying. As long as it is placed in the sun, it can be charged without having to replace the battery, saving the cost of purchasing the battery and reducing the environmental pollution of the used battery.