Seoul Semiconductor president Lee outlines AC-LED potential at SIL 2012

Feb. 21, 2012
The CEO of Seoul Semiconductor, Chung Hoon Lee, spoke at the recent Strategies in Light, where he highlighted the advantages of AC-LED modules.
At the recent Strategies in Light (SIL) conference in Santa Clara, CA, Chung Hoon Lee, CEO and founder of Seoul Semiconductor, provided a keynote address that discussed some of the principle behind the Acrich2 AC-LED modules, which operate directly from AC line voltage. In addition, two of the company’s AC-LED modules have been recognized under UL’s Component Recognition Program.
Lee described Acrich2 modules as being suitable for many residential and commercial lighting applications where the main source of available power is AC.

Speaking on the complexity of LED lamp design, Lee showed a chart that compared Acrich2 LEDs to DC LED lamps manufactured by five other companies (listed as Company A through E). Holding up the electrolytic converters and other components of the LED lamps, Lee asked “What is this?” His answer, “This is junk,” received applause from the audience.

Lee stated that these additional components can cause LED lamp failures. In tests, Seoul Semiconductor determined that many of the other LED lamps reached temperatures of 70C to 82C during operation. The CEO stated that even though companies typically claim lifetimes of 35,000 or 50,000 hours for their lamps, that lifetime can be reduced to 10,000 hours or less due to these operating temperatures. Moreover, tested power factor of the LEDs ranged greatly, from 54% to over 90%.

Lee said the Acrich2 design can provide a better power factor and less total harmonic distortion. “We can reduce the heat sink, protect the environment and provide more design freedom,” he said.

Acrich AC-LED modules use an integrated circuit to provide power conditioning and circuit protection, necessary functions with AC LEDs. In recent weeks, Seoul Semiconductor has made several product announcements in the Acrich2 family including a Linear Module designed as a fluorescent replacement.

The UL recognition is designed to help customers using the modules to more easily obtain UL listing of their replacement lamps and luminaries. For the UL testing, requirements contained in the UL 8750 standard were used. The two modules, SMJEA3011220, an 8W module that produces a minimum of 500 lm, and the SMJEA3012220, a 13W module that produces a minimum of 800 lm at a 120V (shown), are designed for replacement lamps and similar applications.