How should LED enterprises seize the dimming LED lighting market?1

In order to promote the reduction of greenhouse gases and alleviate the warming process, countries have banned the production and use of incandescent lamps. China also plans to ban the import and sale of ordinary lighting incandescent lamps of 15 watts and above by October 1, 2016, and replace incandescent lamps with high-efficiency lighting products. In order to promote the reduction of greenhouse gases and alleviate the warming process, countries have banned the production and use of incandescent lamps. China also plans to ban the import and sale of ordinary lighting incandescent lamps of 15 watts and above by October 1, 2016, and replace incandescent lamps with high-efficiency lighting products. Energy conservation is one of the outstanding advantages of LED, and it is also an important basis for the government to issue policies to promote the application of this technology. In general lighting, if dimming technology is introduced, the energy-saving advantages of LED lighting can be brought into full play. The main dimming methods and their advantages and disadvantages. At present, there are three common dimming methods on the market: PWM dimming, SCR dimming and linear dimming. SCR dimming has long been used in dimming methods for incandescent lamps and energy-saving lamps, and is also a widely used dimming method for LED dimming. The advantages of SCR dimming are high working efficiency and stable performance. However, based on its working principle, there are also some design defects in application. The root of the defects lies in the need for a maintenance current to maintain conduction after the thyristor is turned on, otherwise it will return to the cut-off state. PWM dimming technology is currently considered as a promising LED dimming technology. Its advantages are simple application, high efficiency, high precision and high dimming effect. The disadvantage is that the general LED driver is based on the principle of switching power supply, if the PWM dimming frequency is 200 ~ Between 20 kHz, the inductance and output capacitance around the LED driver are prone to audible noise. Linear dimming is mainly based on a simple voltage division principle. Its advantages are simple application and no interference. Its disadvantages are inflexibility and low efficiency. Moreover, when reducing LED current, it will cause the white LED to shift to the yellow spectrum, and at the same time it will generate too much heat due to partial pressure. The price of dimming driver IC is too high. According to industry sources, the price of domestic LED lighting driver IC has dropped to more than two cents per chip, and the quality is not much different. the same IC foreign manufacturers also quoted more than two, domestic enterprises almost monopolized the LED lighting drive market, but the ordinary drive IC market price is too low, almost unprofitable. As a result, semiconductor manufacturers have turned their attention to the more valuable LED dimming driver IC. Wang Yongbin, director of lighting products marketing for NXP Semiconductor Greater China, said that the unit price of LED dimming driver IC has now dropped to 0. 45-0. $6 instead of dimming the drive IC is about 0. 3-0. $4. At present, the price of LED dimming drive is still too high, which is mainly related to the immature LED dimming lighting market: there is almost no demand for dimming in domestic LED lamps. foreign markets North America and Australia also have little room for market growth. The International chip manufacturers who used to do dimming did not want to fight, and the rhythm and intensity of pushing new products were not as good as before, and the price was not high. Dimming compatibility is still an obstacle. The main obstacle to the large-scale adoption of dimming LED lamps is the same dimming compatibility problem as compact fluorescent lamps in addition to the relatively expensive procurement costs. For most consumers, buying LED bulbs is a frustrating experience. Because when you buy it home, you will find that most LED bulbs cannot be used, so many lamps cannot solve the problem of dimming compatibility. It is a very complicated project to solve the problem of dimming compatibility 100, because it mainly involves 4 key parameters: function; Steady state without flicker; Smooth dimming and; Dimming range (Large Value-Small value). We know that it is very necessary and promising to develop dimming LED lighting from the perspective of energy conservation and environmental protection or user experience. The demand of dimming can be divided into three categories: one is the need of functional adjustment of light, such as entrance porch, meeting room, etc. ; The second is the embodiment of comfort and life style in home life. The light and shade matching of lights can not only be adjusted according to the needs of the environment, but also play a role in setting off the atmosphere. The third is the need for environmental protection and energy conservation. The main reason that drives dimming technology to become the future development direction of LED drive technology is energy conservation.