In the hope of environmental protection, LED lighting has become a hot market, many lamp manufacturers rush in. But the LED lamp market is not mature. From the perspective of global market, CFL energy-saving lamp has a stronger growth. At the recent Hong Kong International Lighting Exhibition, Chen Rong, senior manager of NXP semiconductor lighting products market, said that it is very inflexible to make LED lamps, which is equivalent to relying on its own shortcomings to replace the traditional lighting. Therefore, LED should adopt innovative lighting methods, rather than make it as a light bulb and street lamp. Moreover, such market potential is not large, which belongs to the short-term market, so led It is most suitable for intelligent lighting. The current CFL driven market exceeds expectations, so NXP believes that the CFL market will continue to perform strongly in the future.

Improving LED light efficiency is fundamental

The heat dissipation of LED lamp has become a focus at present. Chen Rong believes that the real effective way is to directly improve the light efficiency of LED, rather than focus on thermal improvement, which is very effective and unnecessary. Because with the improvement of LED technology, its light efficiency can be doubled every 20 months, which is similar to Moore's law of semiconductor industry.

For the high-power lighting scheme above 400W, based on the consideration of efficiency and cost, the adoption of resonant drive has become the consensus of the industry. In the field of low-power lighting below 250W, the driving mode of Buck and flyback is generally adopted. The step-down drive scheme has the advantages of small size, high cost and poor safety, while the flyback drive scheme has the advantages of high safety but large size and high cost. For the United States, Japan and other countries and regions that adopt low-voltage market power, because the pressure difference from 110V to 60V is small, it is easier to implement LED lights in these regions. In addition, the Japanese government's subsidy for LED lights is 50%. Next year, LED lights will gradually become the mainstream in Japan. In China and European countries, flyback drive is suitable, but it is difficult to improve the performance of LED under such input voltage.

In addition, in order to reduce the ripple and prolong the life of LED lamp, the drive scheme on the market is to place electrolytic capacitor at the input or output end. However, some people in the industry think that the performance of electrolytic capacitor will become the bottleneck of LED lighting, and some semiconductor manufacturers have introduced the scheme without electrolytic capacitor. However, Chen Rong stressed that electrolytic capacitor is not the bottleneck of LED driving scheme. As long as the electrolytic capacitor with good quality is selected and the circuit is set, such problems can be avoided. At the same time, he thinks that the scheme without electrolytic capacitor is not mature enough and has obvious EMC problems. At the same time, it takes a certain time for the scheme without electrolytic capacitor to pass the standard test.

According to reports, as of May 2010, NXP has shipped 10 million ssl2101 driver chips. Its ssl2102 won the technology innovation award at the international lighting show in Las Vegas. There are dozens of manufacturers of dimmable LED bulbs based on NXP chips. At the Hong Kong International Lighting Exhibition, NXP presented a dimming scheme for LED lights. Unlike the digital dimming scheme, it uses the old analog dimming device, so that users can use LED dimming lights without redecorating their homes.

Chen Rong claims that the current LED lamp Market in the mainland is in chaos and needs a shuffling process.

In addition, how to locate the relationship between hid and LED street lights is worth examining. From the system level, HID is used in street lamps and light efficiency is higher than LED street lamps, HID lamps are also more suitable for higher position lighting, such as sports venues lighting. In automotive headlights, hid accounts for 20% of the market share, which will continue to increase in the future, while LED is currently mainly used in automotive taillights.

NXP focuses on CFL

It is understood that NXP lighting chip front-end manufacturing in the Netherlands, back-end sealing test in Suzhou. NXP's market share of driving chips for high-quality energy-saving lamps below 25W is absolutely dominant. It ships 60 million driving chips for CFL market, because most of the world's lighting products are produced in mainland China, of which 40 million are sold in China. Therefore, NXP is equipped with 10 chip design engineers and 10 application development engineers for the lighting market. According to reports, its uba2211 is a "dragon" chip developed by the Chinese design team for the Chinese market.

In general, the lamp life test is determined by the survival rate that can be achieved by continuous illumination for a certain period of time. But in practice, 90% of the old energy-saving bulb products are limited to fast closing. The actual switch of these bulbs will not light up about 6000 times, but the tubes are actually good. The appearance of the filament is black, but the filament is broken due to loss during the switch process. We know that when the lamp is on, the light is generated by the electrons emitted from the filament, and the filament will emit atoms from the process of power on to gradual lighting up, which will be continuously consumed. NXP chip provides fast light function, shortens the start-up time of the bulb, preheat the bulb and reduce the filament loss. Therefore, the new energy-saving lamp with NXP chip can support more than 300000 times of switching, and prolong the lamp life by 2-3 times. In dimming products, it is said that super energy saving lamps using NXP's driver chip will be available soon, and the product can adjust the light to 1%

In 2013, the new EU standard will upgrade from 10000 switching times and 50% of 6000 hours lighting survival rate in 2009 to 30000 times and 70%. The industry guesses that the new EU standard will be closer to the EU standard in the future, so the new EU standard has more reference value.