Songbei QA | What dimming technology does LED explosion-proof light have?
Date:2022-06-30 11:00:00 Views:526
Q: What dimming technology does LED explosion-proof light have?
A: The dimming methods of LED explosion-proof lamps are classified according to the control of the LED drive current output.The dimming methods are also divided into three types:
In the early stage of promotion, in order to achieve the purpose of dimming and energy saving, the idea of interval lighting was used for reference, and the LED chip of a set of LED explosion-proof lamps was divided into two parts, which controlled the on and off of the driving current respectively. Before 12:00 midnight, all LEDs are fully lit, and half of them are turned off after 12:00 to achieve the purpose of energy saving. This dimming method can achieve a certain energy-saving effect, and the uniformity of illumination is significantly improved compared with the traditional interval lighting method, but it will still affect the light distribution curve of LED explosion-proof lamps. In order to further improve the luminous efficiency and light distribution curve of LED lamps, some LED lamp factories also consider arranging the LED chips in an interval manner, and only see the interval on or off during dimming, which improves the uniformity and brightness to a certain extent. light distribution.
The brightness of the LED chip is proportional to the LED driving current, so the dimming of the LED lamp can be realized by adjusting the LED driving current. The second dimming method is usually called the analog dimming method or the linear dimming method. The advantage of this dimming method is that when the driving current increases or decreases linearly, the influence of the overshoot of the driving current on the LED chip is relatively reduced, and the control circuit has strong anti-interference. The disadvantage is that the change in the drive current will have a certain impact on the color temperature of the LED chip.
The third dimming method is the pulse brightness modulation (PWM) method. This method is to make the driving current in a square wave shape through a certain control, and its pulse max-width='100%' width is variable. Through the adjustment of the pulse max-width='100%' width, the continuous lighting time of the LED explosion-proof lamp is changed, and the output power is also changed, so as to achieve the purpose of energy saving. The frequency is generally controlled at 200Hz~10KHz. Due to the persistence of human eyes, the flickering of the light source during the dimming process will not be felt. The advantage of this dimming method is that it can improve the heat dissipation of the LED, and the disadvantage is that the overshoot of the driving current has a certain influence on the life of the LED chip.
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