Analysis: The potential of LED lighting market

Today, LED lighting has become a mainstream technology. This technology is becoming more and more mature. 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 increase in the future. However, in recent days, the work of LED lighting designers has become more intractable, because at the same time meet the following two requirements: both to achieve dimming control functions with dimmers for incandescent lamps, but also to achieve high power factor performance The adjustment of LED brightness is mainly divided into analog dimming and PWM dimming. The following will introduce LED dimming. With the continuous and rapid development of the LED application market, the continuous expansion of the application range has also led to a continuous increase in product requirements. This function of LED brightness adjustment in LED terminal products is also very necessary. It is also the current link such as LED lamps and displays.

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, the advantages of dimming control may not be lost when switching to LED lighting. This involves many related knowledge of 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. One example is Energy Star's solid-state lighting energy efficiency specification (09/12/07), which specifies that the power factor (PF) of residential lighting products should be greater than 0.7, and the power factor (PF) of commercial lighting products should be greater than 0.9.

LED lighting dimming method is the most important and common three, these three dimming skills are based on the LED drive current input to adjust the light. According to different circuit systems can also be divided into analog dimming and PWM dimming.

The first one: This dimming method is to complete the dimming of the LED lamp by modulating the LED driving current. Since the brightness of the LED chip is in proportion to the LED driving current, we can adjust the LED driving current to control the LED lamp. Bright and light.

Second: This dimming method is called pulse width modulation (PWM). This method is adjusted so that the drive current is square wave-shaped, its pulse width is variable, the modulation of the pulse width is converted into the time for modulating the LED lamp to continuously light, and the input power is also changed at the same time so as to achieve energy saving and dimming. aims. The frequency is about 200Hz~10KHz, which is the same as usual. Because of the lag of the human eye vision, it does not feel the brilliance of the light source during the dimming process. The advantage of this kind of dimming method is that it can improve the heat dissipation performance of the LED. The defect is that the overshoot of the driving current definitely has a certain influence on the life of the LED chip. The hometown of the Chinese lamps and lanterns. Yuyao lighting companies rely on the advantages of the local industry and make full use of their strength. "Energy conservation and environmental protection" features, in the design and development of products, the "energy saving" brand, and constantly applying new energy-saving and environmental protection technologies to develop products to meet market demand. According to statistics, in the first four months of this year, Yuyao exported 2230 batches of energy-saving lamps, value of 50.06 million The U.S. dollar increased by 32.5% and 18.4% year-on-year, respectively....

The third kind: This dimming method is called imitation dimming method or linear dimming method. The advantage of the 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 dimming circuit has strong nuisance resistance. The defect is that the process of changing the magnitude of the drive current must have a certain influence on the color temperature of the LED chip.