Light Emitting Diode (LED) driver is an electronic device that converts DC power supply into a constant current source suitable for LED operation. The main function of the LED driver is to control the brightness of the LED and protect the LED from harmful factors such as overcurrent, overheating and overvoltage.
The working principle of LED driver is to convert AC power supply to DC power supply, and then stabilize the current within the operating current range of LED through current regulating circuit. The common LED drivers are constant current type and constant voltage type.
Constant current LED driver uses current feedback loop to control the current of LED, so that LED is in a constant working state. Constant current drivers usually have higher efficiency and longer life, and are suitable for scenes requiring stable brightness, such as lighting and display applications.
The constant voltage LED driver controls the brightness of the LED by controlling the output voltage. The current of the LED is determined by the resistance of the LED itself. The constant voltage driver is suitable for scenes requiring dimming function, such as stage lighting and backlight display.
LED drivers generally have the following characteristics:
1. Wide input voltage range: LED drivers can adapt to different input voltages, usually supporting a wide range of input voltages, such as 85-265VAC 、 TPS7A6650QDGNRQ1 。
2. High efficiency: LED driver has high conversion efficiency, which can usually reach more than 80%. High efficiency can reduce energy consumption and heat generation, and extend the service life of LED.
3. Protection function: LED driver usually has functions such as overcurrent protection, overheat protection and overvoltage protection, which can protect LED from damage.
4. Dimming function: Some LED drivers support dimming function, and the brightness of LED can be adjusted through external dimming signal or built-in dimming circuit.
5. Small size: LED driver is usually designed with high integration, small size, convenient for installation and wiring.
6. Long life: LED driver adopts high-quality electronic components and stable working circuit, with a long service life.
In a word, LED driver is a device that converts DC power supply into current or voltage suitable for LED operation. It has high efficiency, protection function, dimming function and long life, and is widely used in lighting, display, backlight, stage lighting and other fields.
