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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.
I have different understandings of the important indicators of the following power sources. I hope to share with you and let everyone see 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 more than 90% conversion efficiency of 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; 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) Line Regulation; 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 input voltage is generally limited (AC220V ±10%) can guarantee, then the single-voltage product can be satisfied, but in the remote areas of the west, this problem will become Complex, but we believe that if the product can guarantee the input linearity 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 circulating in the market, we must know that, in the case of underground parking lots, it is easy to have large-scale lamp string and the voltage is not difficult to be less than 180V.
4) Ripple, noise and total harmonic distortion (Ripple, Noise & THD); ripple and noise can cause strobe, if we can suppress without increasing 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.
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