Three development potential of LED lamp dimming technology

Today, LED lighting will become mainstream technology. Technical maturity, one of the many features of LED lighting standards and regulations have been put forward. Strict efficiency requirements have existed for a long time and will continue to grow. But recently, LED lighting designer's work is more difficult, because of the need to meet two requirements: incandescent lamp dimmer dimming control used to achieve, and to achieve the dimming performance of high power factor LED, current analog dimming and PLEDzatemneniemdELenie description of the situation as follows.

With LED application market will continue to grow rapidly, increasing the LED range of products, increasing the demand for high-end products on the LED brightness control function is also very necessary. At the meeting, for example, LED lights and monitors should pay attention to the link.

Dimming is a very common feature of lighting system. For incandescent lamps, it can be easily implemented at low cost. LED lamp dimming but there are some difficulties, but for architects and residential users, in the conversion to LED lighting can not be lost due to the advantages of dimming control. This involves a lot of relevant knowledge of LED lighting.

Power factor is a very important factor, because of the high power factor can reduce the loss of distribution network. The most effective way to reduce the environmental impact of power use is to reduce waste, so regulators around the world are further tightening their power factor specifications. One example is the energy star solid state lighting energy efficiency specification (09/12/07), which specifies the power factor (PF) of residential lighting products should be greater than 0.7, commercial lighting products power factor (PF) should be greater than 0.9.

Dimming method lamp mainly, there are three kinds of common, these three skills are dimming dimming according to the change of the LED drive current of the input. According to different circuit system can also be divided into analog dimming and PWM dimming.

First: the dimming dimming method for driving current through the modulation of LED to complete the LED lamp, the brightness and LED chip LED drive current into a certain proportion, so we adjusted the LED drive current control LED lamp brightness can be.

Second: the dimming method called pulse width modulation (PWM). This method is by adjusting the drive current is undulate, the pulse width of the variable, after the change of the pulse width modulation for LED light modulation of continuous light time, also changed the input power, so as to achieve the goal of energy saving, dimming. Frequency is about the same as usual in 200Hz~10KHz; because of the lag of the eyes of the eyes, do not feel the light source in the process of light generated by the phenomenon of light. The dimming is good for heat dissipation properties of LED can be improved, defect is the driving current overshoot of LED chip's life must have some impact China lamps hometown "lamps in Yuyao enterprises rely on local industrial advantages, we should make full use of" energy saving and environmental protection features, "such" brand in the product design and development in the continuous application of new energy saving and environmental protection technology to develop products to meet the market demand. According to statistics, in April this year, Yuyao exported 2230 batches of energy-saving lamps, the value of $50 million 60 thousand, an increase of 32.5% and 18.4%, respectively,....

Third: this method is called the advantages of imitation power cuts of a power outage or straight-line metod.Vid dimming method is that when the driving current linear growth or decline, reducing emissions of the driving current of LED in the process of chip life, strong anti nepriyatnost.Nedostatkom coloring scheme changes the size of the disk in the current process, of course. The color of the LED chip to a certain extent.