Patent ID: 8482219
Filing Date: 2013-07-09
Classification: H05B,Y02B

Abstract:
1. A controller for controlling dimming of a light-emitting diode (LED) light source, said controller comprising: a switch monitoring pin that monitors an operation of a power switch, wherein said power switch transfers an AC voltage to a rectifier when said power switch is on; a current monitoring pin that receives a current monitoring signal indicating a current, flowing through said LED light source; and a control pin that generates a control signal to control a second switch coupled in series with said LED light source to adjust brightness of said LED light source according to said operation of said power switch, wherein in response to said switch monitoring pin receiving a dimming request signal indicating a first set of operations of said power switch, said control signal continuously varies said brightness of said LED light source among a plurality of discrete levels when said power switch is on.