LED Lighting Will Completely Solve the Price Problem to Popularize the Application

"The price of LED lighting decreased very fast in 2012, which makes LED lighting rapidly enter various application fields." Wang Yongbin, marketing director of lighting products in Greater China of NXP semiconductor (NXP), analyzed this magazine on the occasion of the 2012 Hong Kong autumn lighting exhibition, "In addition, we found a new trend, that is, non dimming LED lighting products are very popular among Asians, including developed countries such as Japan and South Korea, which may be related to their use habits. Europeans and Americans prefer dimming lighting." This is good news for the LED industry, because at present, the price of non dimming IC is about half cheaper than that of dimmable IC, and IC is still the most important part of the cost of the whole LED lamps. Wang Yongbin then added: "another trend we found is that after continuing the LED ball gun and tube series, LED lamps will begin to become the mainstream demand in the next year." Therefore, in the next year, NXP and other LED semiconductor solution providers will focus on the non dimming and high-power lamp market, because the growth potential in Asia is huge.

In addition to the above trends, Wang Yongbin also revealed that at present, lighting manufacturers have high requirements for power factors, because many countries, including China, especially require the FP of some lighting to be greater than 0.9, and will subsidize up to standard products. "For example, in the bidding of China's energy-saving and people-friendly projects, two points will be added for products with FP greater than 0.9, and the Chinese government will give supplementary posts. In addition, it is also required in the European energy star that when the power is greater than 25W, the FP must be greater than 0.9." He pointed out that in the schemes of some IC manufacturers, the realization of high-power factors needs to be controlled from the outside, which will increase the cost, while NXP can be realized from within the chip, which is not only convenient for design, but also reduces the cost. "For example, the ssl2109a controller can realize FP greater than 0.9, less peripherals and simple and convenient design due to the use of special circuits." he cited an example.

It is also aimed at another product series ssl21081 (a) / 83 (a) of non dimming integrated high-voltage MOSFET, with high integration, less peripheral components, only 14 required, and lower overall cost. Due to the integration of MOSFET, the efficiency can reach more than 95%. However, at present, the FP of this scheme can only be greater than 0.7. "Ssl21081 (a) / 83 (a) It can achieve 5% current precision control and 95% efficiency output, complete protection functions and built-in flexible and reliable features, ensuring the lowest system component cost. It is welcomed by users in Asia and will be the main product this year and next. " He explained that not all IC companies can integrate the high-voltage MOSFET into the controller. NXP can achieve good heat dissipation due to the high-voltage SOI insulation process, so as to integrate the high-voltage MOSFET to achieve efficient lighting. For some companies that integrate 750V MOSFET, while NXP only integrates 600V MOSFET, Wang Yongbin explained that at present and in the near future, integrating 600vmosfet is enough and more The result is waste and increased costs.

For the high-power LED lamp market that will become the mainstream in the next year, NXP launched ssl4120 in Hong Kong this time, which is an integrated success rate factor correction (PFC) GreenChip? Half bridge resonant controller can support high-power LED applications up to 400W. At present, it has been mass produced and samples will be available soon. Ssl420 fully supports commercial power applications and supports efficient start-up directly from the rectified general commercial power voltage range of 90 to 305 volts. In addition, it also supports low total harmonic distortion (THD) of less than 10% and high power factor of higher than 0.97 (PF) and 380 kHz typical PFC frequencies meet and exceed the traditional requirements of high-power LED lighting applications. Ssl4120 can be widely used in high-power LED applications, such as office lighting, shopping mall lighting, high and low shed lighting, parking lot lighting, square lighting and street lighting.

For the confrontation between single-stage and two-stage LED driver architectures in the current market, Wang Yongbin said that NXP is the defender of single-stage architecture. The main reasons are as follows: first, NXP has long-term accumulation and advantages in single-stage; second, single-stage controller can integrate high-voltage MOSFET; third, single-stage is easy to use and easy to design, and customers can develop successfully in only two weeks; fourth, single-stage is successful at present This advantage, two-level BOM is about 10-15% more expensive than single-level BOM.

Finally, when it comes to the trend of some lamp manufacturers to do vertical integration, R & D and drive IC / components, Wang Yongbin believes that this is only a temporary phenomenon and will not become the mainstream. "It is still difficult for companies making lamps to do the electronic part. In the future, they will still specialize in the division of labor, and the driving part will be independent." he personally believes.