2014 is the Lunar New Year of the Horse. For the LED drive power market, it is destined to be a year of glory. This year, LED general lighting will enter the homes of ordinary people, is expected to grow by more than 100, and will continue to grow in the next three to five years. 2014 is the Lunar New Year of the Horse. For the LED drive power market, it is destined to be a year of glory. This year, LED general lighting will enter the homes of ordinary people, is expected to grow by more than 100, and will continue to grow in the next three to five years. Everyone knows that the drive is the heart of the LED light source, and at the same time is the most vulnerable part of the LED light source. Therefore, how to make a LED drive power supply is really a prerequisite for an LED light source.
This paper analyzes the future development direction of LED drivers:
1) Conversion efficiency (Efficiency); LED light source as an emerging light source, the pursuit of unit power luminous efficiency is an inevitable trend, and the realization of high luminous efficiency by the LED itself's light efficiency is improved, the second depends on the driving power supply AV / DC Increased conversion efficiency. In the existing technology, the possibility of a short-term improvement in the short-term efficacy of LEDs is small, but it is not difficult to achieve an AC/DC conversion efficiency by using different topologies. For example, now we use a non-isolated architecture to achieve conversion efficiency of more than 90 AC / DC drive power, such a program has been sought after by the industry and gradually become a trend. In detail, the bulb should be a non-isolated, non-strobe solution, especially in the case of a graphene thermally conductive plastic case to ensure insulation. The T8/T5 rod tube should be implemented with a non-isolated high PF value and no stroboscopic scheme.
2) Constant current accuracy (ConstantCurrent); the constant current accuracy determines the rate of change of output brightness. Therefore, proper constant current accuracy is a necessary guarantee for healthy light sources. At the same time, the accuracy of the constant current also affects the light attenuation of the light source. Therefore, a qualified drive power supply must have relatively good constant current accuracy. In the market, we see a lot of products, including the international first-line brand (P brand E14 candle light; domestic big brand FSL lighting E27 bulb), using the way of resisting and reducing the voltage, the brightness of the whole lamp with the input voltage It is really irresponsible to change and change dramatically.
3) Linear Regulation (LineRegulation); linear adjustment rate determines the geographical extent of the use of a finished light source. For example, in the central and eastern regions of our country, the national grid is relatively stable, and the range of fluctuations in the general input voltage is limited (AC220V10), so that single-voltage products can be satisfied, but in remote areas of the west, this problem will become complicated, but We believe that if the product can guarantee the input linearity adjustment of 160V-265V, it can basically meet the needs of China, even in most parts of the world (except the Americas and Japan). But if you are pursuing perfection, you can achieve an international input voltage of 85-265V; but you still can't guarantee that your product will not be damaged in rural India. A friend who works in the mainland has bought a T8 rod tube made by a low-cost civilized manufacturer (M manufacturer) in Guangdong. When the input voltage is 240V, the brightness can reach 1220 lumens, but when the input voltage reaches 180V, the output brightness is It became 723 lumens. Products like this, I think it should not be in the market, we must know that, like the underground parking lot, it is easy to appear large-scale string string, the voltage is difficult to not less than 180V.
4) Ripple, noise and total harmonic distortion (Ripple, NoiseTHD); ripple and noise will cause stroboscopic, if we can suppress without increasing the cost, we should of course pay attention. If your guests are very concerned about the strobe seen in the camera lens, then you should do this well. For distortion, what do you think is your business, I don't pay much attention to it anyway, but if the customer cares about this, we have to spare no effort to do it well, but the increase in cost must also be transferred to the customer.
5) Power Factor Correction (PFC). The power factor PF value determines the efficiency of the national grid, but the power factor is positively related to the power. If you are going to pursue a power factor with a 3W bulb, you can only think of you as a very socially responsible person. But if you do a high-power drive power of more than 80W, instead of pursuing this, you will feel that you are too socially responsible, and that's it. The State Grid has already made a lot of money. We don't have to bear any responsibility for the quality of the power grid, so we don't pursue it. On the contrary, I will pursue higher efficiency.
6) Safety and Electromagnetic Compatibility (SafetyStandard and EMI); Safety is the norm and law of every country or region. It is also a threshold and a trade barrier. But in any case, it is also a standard to regulate an industry, to evaluate the quality of a product, and to ensure a safe barrier to electricity. In China, safety and EMI issues are not standardized enough, relying on our self-discipline. A responsible company should ensure the safety of the product's electricity and the safety of the user. Beyond this bottom line, it will eventually be rejected by users.
7) Reliability; As the heart and short board of LED light source, ensuring the reliability of the drive product is the primary problem. Otherwise, the gods are clouds. Some customers have misunderstandings on the reliability issue. Let's take a point to solve the capacitor. Some people think that the life of the electrolytic capacitor is the shortest board of the LED barrel. It seems to be correct in theory, but the problem is that some designers However, the understanding of electrolytic capacitors is too superficial, blindly pursuing the brand of Japanese high-rise (Rubycon, Nichicon, etc.), but neglecting the working environment of electrolytic capacitors in the design of the whole lamp, and let the electrolytic capacitor work at a high temperature of more than 90 degrees for a long time. in. If so, the life of the electrolytic capacitors on the taller ones will be greatly reduced. If you use graphene heat-conducting plastics, make sure that the drive is not wrapped by thick insulating sleeves, especially if the working environment temperature does not exceed 65 degrees. You can use the ordinary domestic 2000-hour capacitor to provide customers with a three-year warranty. No worry. Think about our domestic TV set, no one will use RUBYCON, but let the user sit back and relax.
In summary, in 2014, the driver should do this: ensure reliability and safety, pursue efficiency and constant current accuracy, try to suppress ripple and noise, and properly adjust the linearity. In pursuit of these, we must consider the price of your products, to ensure that low prices are the constant pursuit of LED light source manufacturers.
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