2013 LED Lighting Solutions Four Trends

2013 LED Lighting Solutions Four Trends As 2012 is about to pass, this year is a mixed picture for LED manufacturers. Although many countries, including China, have already banned the sale of incandescent lamps, sales of LED lamps have not broken out as scheduled. Instead, there have been a series of chain storms in which lighting manufacturers have closed down. However, there are also manufacturers who are smiling and making full profits. Overall, this year's LED market is a year of normal adjustment. For the LED lighting market in 2013, LED light bulbs replacing 40-watt (W) incandescent bulbs will have the lowest retail sales. The price has reached the sweet spot of US$10, and the industrial circles are optimistic that the overall LED lighting market will get warmer next year. Therefore, what companies are now doing is to do a good job of technical reserves and program selection, and only wait for the market to fully invest. Here, we discuss the four trends of LED lighting solutions in 2013 in conjunction with new products released by several mainstream LED manufacturers such as Power Integrations.

Trend 1: Large upgrade of dimming technology is expected to become a bright spot in lighting In LED lighting applications, the challenges faced by dimming technology are very large, because LED lighting adopts current driving mode, and existing dimmers mostly use voltage dimming. So the challenge in terms of compatibility is quite big. However, this is also a tool to identify the advantages and disadvantages of the solution. In the previous LED dimming solutions, the common problems are a small dimming range, a sudden brightening in dimming, and low dimming. The flashing and so on have seriously affected the user experience. However, with the introduction of proprietary solutions such as PI, LED dimming problems are expected to be resolved. With PI's newly released LYTSwitch IC, excellent dimming performance can already be achieved. The NEMA SSL6 standard can be easily achieved even at low conduction angles. In addition, the startup speed of the driver is very fast, usually less than 500 milliseconds. Even when the 10% light output is turned on, the startup speed is also very fast. In the solution, the bulb designed using the LYTSwitch IC can be turned on at almost the same dimming angle as when turned off, which virtually eliminates sudden brightening. In addition, the dead zone in TRIAC dimming is also eliminated because the LYTSwitch controller ensures that dimming is performed immediately when the dimmer begins to operate. In this regard, PI claims to have a patented circuit technology. From the dimming curve, PI's scheme has obvious advantages.

Trend 2: Single-level circuit architecture gradually takes up the mainstream In the past, in order to obtain better dimming characteristics, many solutions adopt a two-level architecture, namely "PFC (power factor correction) + isolated DC/DC converter" The architecture, this design can effectively reduce the power supply ripple, because designers believe that the single-stage PFC circuit ripple is too large, and fear that this leads to LED life, luminous efficiency and color temperature problems, therefore, more use of two-stage circuit, Now, with the introduction of single-level solutions with high switching frequency, the advantages of single-stage circuits are very obvious, because in terms of efficiency, it is difficult for dual-stage circuits to compete with single-stage circuits. At present, several manufacturers can achieve a single-level scheme. More than % efficient, dual-stage circuits typically have only about 85% efficiency.

Another advantage of a single-stage circuit is that the circuit is simple. As can be seen from the above figure, PI's solution can achieve 92% efficiency! Therefore, the future adoption of single-level circuits will dominate the mainstream. This is also the opinion of some industry experts.

Trend 3: Integration of PFC and MOSFET becomes standard In the past, especially for low- and medium-power lighting solutions, many manufacturers did not consider the PFC circuit, because on the one hand, the country did not have mandatory requirements, and on the other hand, it would increase the cost of the solution. The integration of PFC in low- and medium-power drive solutions has now become standard. First, it is in line with the general trend of energy-saving and emission-reduction. In addition, the Chinese government has taken the lead in clarifying such requirements in bidding projects. Therefore, chip manufacturers have followed suit.

According to McKinsey's market research report "Lighting the Way", LED bulb prices fell by around 9% per quarter. In order to make up for the loss in price, IC component manufacturers will adopt high integration strategies to enhance the functions of the driver ICs. At present, many manufacturers adopt the integrated MOSFET strategy to integrate 500V or 600V MOSFETs and provide a complete protection scheme, which can make LED solutions more compact Reliability has also improved. The current PI solution is to integrate high-voltage MOSFETs with 650V and 725V.

Trend 4: Electrolytic Capacitor solution matures Since the LED lighting has gradually been heated up, the use of electrolytic capacitors in the lighting program continues to be controversial. Opponents believe that the electrolytic capacitor is the killer of the led lamp life. It is believed that the electrolytic capacitor has seriously affected the LED lamps. Life expectancy, and those who support it, believe that the role of electrolytic capacitors in filtering out ripple is not negligible, especially as the low-frequency flicker caused by the high ripple current caused by the non-electrolytic capacitor becomes more and more noticeable. Researchers believe that strobe frequencies below 165Hz are not easily noticeable by the human eye, but this has caused physical discomfort to some people's eyes. Large amplitude low-frequency ripples can also cause some digital camera equipment to appear beatless. Flashing light and dark grids, so the proponents proposed to use high-capacity electrolytic capacitors to solve, but this increases the cost and size. Is there no solution yet?

Judging from the latest new products, the leading manufacturers unanimously believe that the electroless capacitor solution will be the mainstream of the future. Each solution to the problem of flicker and ripple is unique. For example, the trend adopted by PI is to increase the frequency of switching power supplies. At 132 KHz, the ripple is much smaller at such high frequencies. At the same time, the required transformer core can also be reduced, which in turn reduces the cost.

In 2013, LED lighting will use more intelligent lighting controls, such as remote control via mobile phones or other devices. However, the ever-changing, low-cost and high-reliability lamps are users who are willing to pay for it. The 2012 harvest will be good. The manufacturer is in line with this principle.

Looking forward to 2013, the LED market will recover from the downturn. Lighting companies will choose your solution and welcome a new climax market!

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