Review of Recent Patents in AC LED Technology
Weifeng Feng, Frank G. Shi and Yongzhi He
Affiliation: Optoelectronics Packaging and Materials Lab, Henry Samueli School of Engineering, University of California, Irvine, CA, 92697-2575, USA.
Keywords: Light Emitting Diodes, AC LED, LED Driver, Opto-Electronic Device, Lighting, Emitting Diodes, AC-DC converter, (IDC), DC voltage, (DC), voltage, current, LED, circuits, PWM, DC-DC, (PFC), rectifier diodes, thermal dissipation, AC LEDs Array, Seoul ACRICHE AC LED, ITRI AC LED
LEDs for lighting application are becoming widely adopted due to economic, energy and environmental reasons. LEDs are conventionally powered by DC sources or AC sources with AC-DC converters. More and more recent research works have been focusing on direct AC powering LEDs without AC-DC converters. Enhanced reliability, lower cost and easy to replace existing lighting fixtures due to the elimination of AC-DC converter are advantages of AC LEDs. DC LED drivers architectures including AC-DC converter based LED drivers are reviewed and compared with direct AC powering LEDs. Issues like flicker effects, current limiting and protection, efficiency and LEDs reverse break down in AC LEDs and recent AC LEDs patents are discussed.
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