Bihua lighting tells you the dimming method of LED downlight
One: this kind of dimming method is called imitative dimming method or linear dimming method. The advantages of this dimming method are: when the driving current increases or decreases linearly, the influence of driving current overshoot on the chip life of LED downlight is reduced, and the dimming circuit has strong anti-interference property. The defect is that the change of driving current must affect the color temperature of LED chip.
Second, this dimming method is to complete the dimming of LED downlights by modulating the LED driving current. Since the brightness of LED chips is in a certain proportion to the LED driving current, we can control the dimming of LED downlights by adjusting the LED driving current.
Third, this dimming method is called pulse width modulation (PWM). This method is to adjust the driving current in square wave shape, and its pulse width can be changed. By modulating the pulse width, the LED downlight can be continuously lit up and the input power can be changed at the same time, so as to achieve the goal of energy saving and dimming.
The frequency is about 200Hz ~ 10kHz as usual; because of the lag of human eye vision, the flicker of light source in the process of dimming will not be felt. The advantage of this dimming method is that it can improve the heat dissipation function of LED. The defect is that the overshoot of driving current must have certain influence on the life of LED chip.
Source: Bihua Lighting Appliance Factory, Henglan Town, Zhongshan City http://www.zsbihualed.com
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