Non electrolytic capacitor driver makes LED lamp life longer

The elimination of electrolytic capacitors with adjustable light emitting diode (LED) drive began to emerge in the market. In the technical breakthrough, dimmable LED driver without electrolytic capacitor and the recent scheme has one out, will help to further improve the service life of LED lamps and reduce the overall LED driver bill of materials (BOM) cost.

Fast technology marketing director Yan Zongfu said that the electrolytic and capacitive adjustable optical LED driver can not only improve the service life and efficiency, but also reduce the size and cost of LED drives.

Fast (Fairchild) technology marketing director Yan Zongfu said, with the national disabled and cut-off incandescent lamp act come into effect, is expected to drive less than 30 watts LED lamp to replace the traditional incandescent lamp and halogen lamp for demand; service life and increase efficiency of LED lighting, LED lighting system developers have requested, LED driver must comply with the International Electrotechnical the Committee (IEC) EN61000 specification for harmonic current of power factor correction (PFC) requirements. The best way to reach this standard is the LED driver, which has no electrolysis and capacitance.

Yan Zongfu further analysis, LED lighting should be as high as 80~100 the temperature operation, and capacitance in high temperature electrolysis so easy to dry, resulting in the working life of not more than thousands of hours of light adjustable drive if built in the mining, electrolytic capacitor, LED lighting will lead to significant attenuation of life. Therefore, dimmable LED driver scheme obviates electrolysis and capacitor, has been committed to the development of power semiconductor manufacturers products, but the technical threshold is high, relatively slow progress.

However, since the second half of 2011, the semiconductor industry has also been to break through the bottleneck of technology, including Maxim, fast and other semiconductor manufacturers have been launched in the absence of electrolytic capacitors and adjustable optical LED driver program. Yan Zongfu pointed out that the non isolated and isolated type quick launch dimmable LED driver, are removed from the electrolytic capacitor, the difference is that the non isolated buck type structure, and isolated using IC line TRUECURRENTCalculation flyback structure to achieve the efficient collocation of patent, current / fixed precise control of up to + 5% in order to improve the PFC.

Fast technology marketing department senior manager Lin Qianyuan stressed that the current industry has adopted the flyback type isolation architecture development of tunable optical drive, but to reach a non electrolytic capacitor and, the biggest challenge is to design the internal IC; and fast through the IC line technology patent technology to overcome setbacks, has become the industry a few isolated type supply electrolytic capacitor and dimmable LED driver suppliers.