To make the life of LED lamps longer, the capacitance in the LED driving power supply is the key
With the banning and production ban of incandescent lamps in various countries, it is expected to drive the demand for LED bulbs below 30 watts to replace traditional incandescent lamps and halogen lamps. In order to increase the service life and efficiency of LED bulbs, LED lighting system developers have demanded, LED The driver must meet the requirements of the International Electrotechnical Commission (IEC) harmonic current specification EN61000 for power factor correction (PFC).
The adjustable LED driver without electrolytic capacitor is the best way to achieve this standard.
The electrolytic capacitor dimmable LED driver can not only increase the service life and efficiency, but also reduce the size and cost of the LED driver. Therefore, the dimmable LED driver solution that saves electrolysis and capacitors has always been a product developed by power semiconductor manufacturers, but the technical threshold is high and the progress is relatively slow.
Dimmable light-emitting diodes that eliminate electrolytic capacitors (LED drivers have begun to emerge in the market. With major technological breakthroughs, the recent dimmable LED driver solutions without electrolytic capacitors have been competing, which will help further improve the use of LED lamps. Longevity and reduction of the overall bill of materials (BOM) cost of the LED driver.
At present, most of the industry uses the flyback architecture to develop isolated dimmable drivers, but the biggest challenge to achieve electroless and capacitor-free is the design of the IC; and the patented IC circuit technology quickly overcomes technical obstacles and becomes the current industry A few suppliers of isolated dimmable LED drivers that can supply electrolytic capacitors.
LED lighting fixtures must be operated at a temperature as high as 80-100°C. Electrolysis and capacitors are easy to dry at high temperatures, resulting in a working life that cannot exceed thousands of hours. If a dimmable driver with built-in electrolysis and capacitors is used, it will lead to the life of LED lighting fixtures. Attenuate drastically. However, since the second half of 2011, semiconductor industry players have also broken through technical bottlenecks one after another. Semiconductor manufacturers including Maxim and Fast have all launched non-electrolytic and capacitor dimmable LED driver solutions. Yan Zongfu pointed out that both the non-isolated and isolated dimmable LED drivers that are quickly launched eliminate the need for electrolytic capacitors. The difference between the two is that the non-isolated type uses a step-down architecture, while the isolated type uses a flyback architecture with a fast patent. IC circuit technology TRUECURRENT Calculation can achieve accurate constant current/control up to ±5%, thereby improving PFC.
