Controllers, systems and methods for controlling dimming of light sources
AssigneeO2Micro, Inc.
InventorsChing-Chuan Kuo, Yung-Lin Lin
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Abstract
A controller for controlling dimming of an LED light source includes a control terminal and dimming control circuitry coupled to the control terminal. The control terminal provides a driving signal to control a control switch coupled to the LED light source, thereby controlling the dimming of the LED light source. The dimming control circuitry generates the driving signal according to a set of operations of a power switch that transfers an AC signal. The dimming control circuitry further adjusts the driving signal by counting multiple waves of the AC signal to control the dimming of the LED light source.
Claims20
A controller for controlling dimming of a light-emitting diode (LED) light source, said controller comprising:
- a control terminal operable for providing a driving signal to control a control switch coupled to said LED light source, thereby controlling said dimming of said LED light source;
- and
- dimming control circuitry coupled to said control terminal and operable for generating said driving signal according to a plurality of operations of a power switch that transfers an alternating-current (AC) signal, said dimming control circuitry operable for counting a number of waves of said AC signal, and operable for adjusting said driving signal according to said number of said waves.
A method for controlling dimming of a light-emitting diode (LED) light source, said method comprising:
- transferring an alternating-current (AC) signal through a power switch;
- generating a driving signal according to a plurality of operations of said power switch;
- counting waves of said AC signal;
- adjusting said driving signal according to the number of said waves obtained by said counting;
- and
- controlling a control switch coupled to said LED light source by said driving signal to control said dimming of said LED light source.
A system for powering a light-emitting diode (LED) light source, said system comprising:
- conversion circuitry operable for receiving an alternating-current (AC) signal through a power switch and providing regulated power to said LED light source;
- and
- dimming control circuitry coupled to said conversion circuitry and operable for generating a dimming signal according to a plurality of operations of said power switch, operable for counting waves of said AC signal, and operable for adjusting said dimming signal according to the number of said waves obtained by said counting, wherein dimming of said LED light source is controlled according to said dimming signal.
Dependencies are inferred from the claim text.