Technical trend of LED lighting chip

Technology products product marketing director Tony Armstrong said that with the further development of LED, its ability to produce power from the utility or light output will only continue to improve. Secondly, LED lighting has the characteristics of environmental protection, and does not need to deal with, expose and dispose of toxic mercury vapor in cold cathode fluorescent lamp (CCFL). Finally, incandescent bulbs are often used for about 1000 hours, and they can be used for up to 10 thousand hours. However, compared with LED lighting can provide more than 100 thousand hours of life, these figures on the dwarfs.

Heat dissipation, reliability and safety need to be considered

TI (TI) Business Development Manager Han Qianquan analysis, as everyone knows, the LED driver module and the module working environment of high temperature, poor heat dissipation, which causes the LED drive circuit has been working at high temperature, which leads to the LED application, to reduce the reliability of a series of problems with a shorter life, so the heat had to focus on; reliability and safety is very easy to ignore the part, especially in the enforcement of relevant provisions, in order to reduce the cost of LED lighting manufacturers will omit the reliability and safety aspects of the circuit; but this is the basic LED lighting industry can develop for a long time, but also reflects the design capability of the LED driver chip manufacturers, different the chip manufacturers to provide solutions, increase this part of the circuit to increase the cost of great difference.

Taiwan accumulation Polytron Technologies Inc product director Yu Zhongwei think should pay attention to the standardization trend forming, such as the United States and Japan PSE Energy Star specification. In addition, dimming function more and more attention, such as the traditional SCR dimming, 1~10V dimming, and DALI dimming. Finally, to solve the problem of heat dissipation is derived on the driving requirements of the program, in addition to cost considerations, more lightweight requirements, must also take into account the better electrical characteristics (efficiency, power factor, electromagnetic interference, output ripple etc.).

LED needs abundant power conversion and driving scheme

A Morimi semiconductor lighting technology market marketing manager Lin Zhiyan said, LED is a low voltage device, according to the different colors and current, the forward voltage drop may change between 2 ~4.5 V, and LED need to be driven by constant current, ensure the luminous intensity and color required. At the same time, a variety of LED applications, the need to use different power supply, such as high voltage AC-DC, medium voltage DC-DC and low voltage DC-DC.

It according to the requirements of specific application requirements, the power conversion for the LED and the LED to drive the driving scheme, such as the switch type driver, linear actuator, linear constant current regulator (CCR), and the high voltage switching power supply, power factor correction (PFC) controller, even lighting management IC novel (LMIC), to meet the specific application requirements, provide high efficiency and high reliability, long life advantages help to play LED.

Technologies also think the market is not the blind pursuit of a "meet", but to understand the characteristics of there is a conflict between the traditional architecture such as single output, power factor and output ripple can also have to compromise and optimization. Therefore, the accumulation of science and technology strategy is to address different needs of different customer solutions. In terms of architecture, in the recent years, the market tends to ignore the isolation scheme, the accumulation can not ignore the non isolated structure in the specific application of the advantages can not be replaced, and therefore continue to develop a variety of products. At present, in addition to the active power factor correction products, SCR dimming and four dimming products have been successfully served, the accumulation is also actively working toward a higher cost-effective solutions.

Drive off-line power supply to promote application

Technology products product marketing director Tony Armstrong said, especially in driving HB (Gao Liangdu) LED applications, through the use of an input voltage range and meet the required output voltage and current requirements of topological structure, linear LED drive IC can provide sufficient current and voltage for many different type LED configuration.

Specifically, only with off-line power supply driver LED can make the application of exponentially growing rapidly, because whether it is a commercial building or residential, the power of this form can be very convenient to get. Although the replacement device of LED lamp is relatively simple, the end user is easy to install, but the new requirements for the LED driver IC has greatly improved. Because the LED needs a good adjustment of the constant current source to provide a constant light output, so use the AC input power supply for LED need to adopt some special design methods, to meet some very special design requirements. To this end, an off-line recently launched a single stage active power factor correction (PFC) innovative isolated flyback LED controller, LT3799.

Compatibility and integration control into a bright spot

MarvELl green energy marketing director Lance Zheng pointed out that in 2011, the entire lighting market growth of more than 40% years, in 2012 to become the key LED market to take off. Compatibility and integrated control will become the two major highlights of technology development.

The first is compatibility, the existing architecture of lighting lighting technology based on the traditional technology, such as incandescent lamp. Due to space limitations, such as to replace these bulbs and configurations, LED lamps need to use the same specifications of the bulb, and lighting control equipment (such as the configuration of the TR