title: A switched supply tunable red-green-blue light emitting diode driver.
abstract: This paper presents a new switched supply tunable red-green-blue (RGB) light emitting diode (LED) driver. The RGB LEDs act not only as light emitting devices but also as rectifying diodes in the presented driver circuit. The RGB LED color control is realized by controlling the switched supply voltage amplitude, frequency, and duty cycle. The driver efficiency is high since the only loss in the driver circuit is the switch and can be further reduced by direct alternate current supply.
authors.affiliation: Optoelectronics Packaging and Materials Laboratory, Henry Samueli School of Engineering, University of California, Irvine, California 92697-2575, USA. weifengf@uci.edu
authors.forename: Weifeng
authors.initials: W
authors.lastname: Feng
authors.forename: Frank G
authors.initials: FG
authors.lastname: Shi
authors.forename: Yongzhi
authors.initials: Y
authors.lastname: He
authors.forename: Bin
authors.initials: B
authors.lastname: Zhao