The first type: This method of dimming is to complete t […]
The first type: This method of dimming is to complete the dimming of LED lights by modulating the LED driving current. Since the brightness of the LED chip is proportional to the LED driving current, we can control the LED light by adjusting the LED driving current. Light and dark.
Second: This method of dimming is called an analog dimming method or a linear dimming method. The advantages of this dimming method are: when the driving current linearly increases or decreases, the impact of the driving current overshoot on the life of the LED chip is reduced, and the dimming circuit is more resistant to interference. The disadvantage is that the change process of the driving current must have a certain effect on the color temperature of the LED chip.
Third: This method of dimming is called Pulse Width Modulation (PWM). This method is to adjust the driving current to a square wave shape, and its pulse width is variable. After the modulation of the pulse width, it is converted to the time that the LED lights are continuously lit. At the same time, the input power is also changed, thereby achieving energy saving and dimming aims. The frequency is about 200Hz ~ 10KHz as usual; because of the hysteresis of human eye vision, the glare phenomenon generated by 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 performance of the LED. The disadvantage is that the overshoot of the driving current must have a certain impact on the life of the LED chip.
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