With the continuous and rapid development of the LED application market, the continuous expansion of the application range has also led to the continuous improvement of the product requirements. It is very necessary to adjust the LED brightness in the LED terminal products. It is also a link that must be paid attention to such as LED lamps and displays.
Today, LED lighting has become a mainstream technology. The technology is maturing, and one of the signs is the introduction of a large number of LED lighting standards and specifications. Strict efficiency requirements have existed for quite some time and will continue to improve in the future. Recently however, the working LED lighting designers but more difficult, because to meet the following two requirements: it is necessary to use a dimmer for incandescent lamp to achieve dimming control function, but also to achieve high power factor performance For the adjustment of LED brightness, it is mainly divided into analog dimming and PWM dimming. The following will introduce the relevant situation of LED dimming.
Dimming is a very common feature of lighting systems. For incandescent lamps, it can be easily implemented at low cost. The dimming of LED lights is difficult, but for architects and residential users, they are reluctant to lose the advantages of dimming control when switching to LED lighting. This involves a lot of knowledge about LED lighting.
Power factor is a very important factor because high power factor can reduce the loss of the distribution network. The most effective way to reduce the impact of electricity use on the environment is to reduce waste, so regulators around the world are further tightening their power factor specifications. An example of this is the Energy Star Solid State Lighting Energy Efficiency Specification (09/12/07), which states that the power factor (PF) for residential lighting products should be greater than 0.7 and the power factor (PF) for commercial lighting products should be greater than 0.9.
The most important and common dimming methods for LED luminaires are three. These three dimming skills are based on changes in the LED drive 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 lamp 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 driving current to control the LED lamp. 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 driving 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 dimming circuit is strong. The defect is that the process of changing the magnitude of the driving current definitely has a certain influence on the color temperature of 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 lighting of the LED lamp, the input power is also converted, thereby achieving energy saving 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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