Dimming is a very common feature of lighting systems. For incandescent lamps, it can be easily implemented at low cost. The dimming of LED lighting fixtures is difficult, but for architects and residential users, they are reluctant to lose the advantages of dimming control when switching to LED lighting fixtures. This involves a lot of knowledge about LED lighting fixtures.
There are three main types of dimming methods for LED lighting fixtures. These three dimming skills are based on changes in current input. According to different circuit systems, it can also be divided into analog dimming and PWM dimming.
The first type: This dimming method is to dim the LED lighting fixture by modulating the LED driving current. Since the brightness is proportional to the LED driving current, we can control the LED lighting current to control the LED lighting. Light and dark.
Second: This dimming method is called a simulated dimming method or a linear dimming method. The advantage of this dimming method is that when the current linearly increases or decreases, the influence of the driving current overshoot on the lifetime of the LED chip is reduced, and the anti-noise of the regulating circuit is strong. The defect is that the process of changing the magnitude of the driving current definitely has a certain influence on the LED chip.
Third: This dimming method is called pulse width modulation (PWM). The method is adjusted so that the driving current is square wave-shaped, and the pulse width is variable. After the modulation of the pulse width is converted into a time for modulating the continuous illumination of the LED lighting fixture, the input power is also converted, thereby reaching and dimming. aims. The frequency is about 200Hz~10KHz as usual; because of the hysteresis of the human eye, it will not feel the sparkle of the light source during the dimming process. The advantage of this dimming method is that it can improve the heat dissipation performance of the LED. The defect is that the overshoot of the driving current must have a certain influence on the life of the LED chip.
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