Discussion on LED drive technology solutions for lighting (with photos)

1 Introduction

Lighting is now generally popular with LEDs . To do this, you must understand the LED's operating conditions, operating principles, driving methods and typical applications to maximize the application of LED lighting.

2 LED working principle

To design a driver circuit, you must first master its working principle. The brightness of the LED is mainly related to VF and IF. The volt-ampere characteristics of the LED are shown in Figure 1, where VF is the forward voltage drop of the LED and IF is the forward current. When the forward voltage exceeds the threshold (ie, the turn-on voltage, as shown in Figure 1.7V), it can be approximated that IF is proportional to VF. As can be seen from the figure, the highest IF of the LED can reach 1A, and the VF is usually 2 V to 4V.

Figure 1 LED's relationship between VF and IF

The forward voltage drop of the LED varies widely (up to 1V or more), and the VF-IF curve in the above figure shows that a small change in VF causes a large change in IF, which causes a large change in brightness. Therefore, usually the luminescence properties of LEDs are described by a function of current, not as a function of voltage. However, the output voltage of the general rectifier circuit also changes with the fluctuation of the grid voltage. It can be seen that the constant voltage source driving cannot ensure the consistency of the LED brightness and affect the characteristics of the LED. Therefore, LED drivers are usually driven by a constant current source.

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