Selection of Driving Power Supply under Dimming of LED Light Bar

Generally speaking, LED light source can be divided into two categories: single LED diode light source or LED diode light source with resistance. In application, sometimes LED light source is designed as a module containing DC-DC converter, so complex modules are not discussed in this article.

If the LED light source or module is a single LED diode itself, the common dimming method is to adjust the amplitude of the input current of the LED, so the choice of the LED driving power supply should refer to this characteristic. The HLG/ELG family of Mingwei Company is characterized by adjustable current, and can be adjusted by external 1-10VDC* or 10VPWM pulse width or even only through outside. Connect a simple variable resistor to control the modulation of the output current. Another kind of LED diode light source with resistors (commonly known as LED lamp bar or LED STRIP), LED lamp bar is widely used with LED diode series resistance, so the voltage is relatively stable, so users can use any fixed voltage power supply on the market to drive the LED lamp bar.

Common LED lamp is usually driven by 12VDC or 24VDC, but it may be difficult to use in the dimming of LED lamp. This paper describes the application of current amplitude dimming driver in LED lamp bar, and also discusses some common dimming problems. At the same time, it also introduces the PWM family series which is introduced by Mingwei Company and has won the national technological innovation product award. At present, it is the most suitable and simplest LED lamp dimming scheme on the market.