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What Is An Led Driver?

Aug. 13, 2020

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LED driver refers to the power adjustment electronic device that drives the LED to emit light or the LED module component to work normally. At present, LED drive chips can be divided into constant voltage drive chips, constant current drive chips, and pulse drive chips. Among them, the constant voltage drive chip is generally our common DC/DC boost chip. The advantage of this scheme is that the chip cost is cheap and there is no complicated peripheral circuit. But only driving the LED with a constant voltage will cause uncontrollable circuit current when driving the output. The consistency of LED brightness cannot be guaranteed.

Principle of led driver

The LED driver refers to the power adjustment electronic device that drives the LED to emit light or the LED module component to work normally. Due to the conduction characteristics of the LED PN junction, the voltage and current range of the power supply it can adapt to is very narrow. A slight deviation may not light up the ED or severely reduce the luminous efficiency, or shorten the service life or even burn the chip. The current industrial frequency power supply and common battery power supply are not suitable for directly supplying LEDs. LED drivers are such electronic components that can drive LEDs to work under the optimal voltage or current state.

The role of led driver

1. Since LED is a characteristic-sensitive semiconductor device and has negative temperature characteristics, the LED driving power supply (also called driver) is to protect it in a stable working state during the application process.

2. The requirements of LED devices on the driving power supply are almost harsh. Unlike ordinary incandescent bulbs, LEDs can be directly connected to 220V AC mains. LED is driven by a low voltage, it is necessary to design a complex conversion circuit, LED lights for different purposes, to be equipped with different power adapters. To design a good power supply, we must comprehensively consider factors such as efficiency conversion, effective power, constant current accuracy, power supply life, and electromagnetic compatibility, because the role of the power supply in the entire lamp is as important as the human heart.

Constant Voltage Led Driver

Constant Voltage Led Driver

Features of led driver

According to the electricity rules of the power grid and the characteristic requirements of the LED drive power supply, the following points should be considered when selecting and designing the LED drive power supply:   

1. High reliability

Especially like the driving power supply of L ED street lamp, it is installed at high altitude, it is inconvenient to maintain, and the maintenance cost is also high.

2. High efficiency

LED is an energy-saving product, and the efficiency of the driving power supply should be high. For power supply installation, the structure of the LED driving power supply in the lamp is particularly important. Because the luminous efficiency of the LED decreases with the increase of the LED temperature, the heat dissipation of the LED is very important. The efficiency of the power supply is high, its power consumption is small, and the heat generated in the lamp is small, which reduces the temperature rise of the lamp. It is beneficial to delay the light decay of LED.

With the increasing application of LEDs, the performance of LED drive power will be more and more suitable for LED requirements.

How to connect Led drive

Constant voltage LED driver is directly connected to the power supply, the output is connected to the LED light, and the dimming is PWM dimming. It is directly dimmed by changing the duty cycle. (No connection required) The other is through Variable resistor to dimming.


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