Power Supply can convert another form power into electrical energy. The generators convert mechanical energy into electrical energy, dry cell convert chemical energy into electrical energy. The battery itself has no electricity. There are positive and negative charges on its two poles. They will provide voltage; electrical conductor has voltage in itself. When we add voltage, it will produce electricity. When the battery’s two poles connect with conductor, it releases charge so that generate electricity. Dry cell also called power supply, there is equipment called eliminator supply convert alternating current into direct current through transformer and rectifier. There is equipment called signal source provide signal. Triode transistor amplification signal which is send before, then we sent signal which it be amplification to circuit in return. We regard triode transistor as signal source to circuit in back. Rectified current, signal source sometimes also called power supply.
Main characteristic
There are different kinds of LED, but they have some common characteristic.
1. Working Voltage
Usual working voltage 3.0~3.6V, low voltage is also valuable. For example 2.0, 2.5, 2.7V; some usual working voltage is 5V, 12V, 24V, and some few voltage are especially useful, for example, 15V and 28V.
2. Working Circuit
The circuit range is about 30~300mA.
3. Package Dimensions
The portable product in development all adopt pester device, the main product are SOT packaging, SOT-23 packaging, μMAX packing and minimum sizeSC-70 and the newest SMD packaging and so on.
4. Safeguard Procedures
The new type of power supply has intact safeguard procedures, including limit of current output, thermal protection, overvoltage protection, short-circuit protection and cell protection.
