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What Is the Driver of the Led Light? Function and Principle?

May. 19, 2020


An LED is a solid light source. When a forward voltage is applied across it, the minority carrier and majority carrier in the semiconductor recombine, and the excess energy released will cause photon emission.

Different materials can be used to make LEDs with different colors. LED is a kind of light-emitting diode, in addition to its light-emitting characteristics, it also has the characteristics of ordinary semiconductor rectifier diodes.

If you compare a lighting fixture to a girl, then light distribution is her connotation, structure is her appearance, and electronics is her heart. Without a heart, there is no life, and the role of power in the entire lamp is as important as the human heart. A good driving power can also determine the life of a lamp product. CE LED driver manufacturer introduces to you:

Why should LEDs be driven?

1. LED lights cannot directly use the conventional mains voltage. Due to the characteristics of LED light sources, in order to meet the special voltage and current requirements of LEDs, specially designed voltage conversion equipment must be used to make LEDs work properly. The lamps and lanterns have a power driving method that is different from the traditional lamps and lanterns.

Driving method of LED lamp power supply

Constant current led driver:

a. The current output by the constant current drive circuit is constant, and the output DC voltage varies within a certain range with the size of the load resistance. The load resistance is small, the output voltage is low, and the larger the load resistance, the output The higher the voltage.

b. The constant current circuit is not afraid of short circuit of the load, but it is strictly forbidden to completely open the load.

c. The constant current drive circuit is ideal for driving LEDs, but relatively expensive.

d. It should be noted that the used current and voltage values limit the number of LEDs used.

Constant voltage LED driver:

a. After the parameters in the voltage regulator circuit are determined, the output voltage is fixed, and the output current changes with the increase and decrease of the load.

c. The voltage-stabilizing circuit is not afraid of open load, but it is strictly forbidden to completely short-circuit the load.

d. The LED is driven by a voltage-stabilized driving circuit, and each string needs to be added with an appropriate resistance to make each string of LED display brightness average.

Constant Voltage Led Driver

Constant Voltage Led Driver

The role of LED driver:

LED drive power is the key to LED lamps. It is like a human heart. To manufacture high-quality LED lamps for lighting, you must give up driving LEDs with a constant voltage. Constant current source drive is an LED drive method that uses constant current source drive without the need for a series current limiting resistor in the output circuit. The current flowing through the LED is also not affected by external power supply voltage changes, ambient temperature changes, and LED parameter dispersion Therefore, the current can be kept constant, and the various excellent characteristics of the LED can be fully utilized.

The LED constant current power supply is used to supply power to the LED lamps. Since the current flowing through the LED is automatically detected and controlled during the power supply operation, there is no need to worry about excessive current flowing through the LED at the moment of power-on, nor worry about load short circuit burning Bad power supply.

Adopt constant current drive mode, it can avoid the current fluctuation caused by the change of LED forward voltage. At the same time, the constant current makes the brightness of the LED stable, and it is also convenient for LED lamp manufacturers to ensure the consistency of products when mass production is implemented. Fully recognizing the importance of driving power, many LED lamp manufacturers have abandoned the constant voltage method, and chose a slightly higher cost constant current method to drive LED lamps.