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US 2012/0235596 A1Published application
Led drivers with audible noise elimination and associated methods
OwnerKaiwei Yao, Zheng Louinventors
Life of this patent
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Abstract
The present technology provides LED drivers with audible noise elimination and methods thereof. A burst dimming signal is used in the LED driver. A switch is serially coupled to the output capacitor of the LED driver and controlled by the burst dimming signal for eliminating any audible noise.
Claims15
A light emitting diode (LED) driver, comprising:
- a power converter configured to provide a driving signal to a plurality of LEDs under the control of a burst dimming signal, the power converter having a plurality of output terminals;
- an output capacitor electrically coupled between output terminals of said power converter;
- a switch serially connected to said output capacitor;
- and
- wherein an on/off operation of said switch is controlled by said burst dimming signal.
2 more elements
A method for assembling light emitting diodes (LEDs), the method comprising:
- electrically coupling a plurality of LEDs with a plurality of output terminals of a power converter, the power converter being configured to operate under control of a burst dimming signal;
- electrically coupling an output capacitor between the output terminals of said power converter;
- serially connecting a switch to said output capacitor;
- and
- wherein said switch is configured to be controlled by said burst dimming signal to eliminate audible noise.
2 more elements
A method for driving light emitting diodes (LEDs), the method comprising:
- driving said plurality of LEDs with a power converter, said LEDs being electrically coupled to a plurality of output terminals of said power converter, an output capacitor being coupled between said output terminals of said power converter, and a switch being serially connected to said output capacitor;
- controlling said power converter with a burst dimming signal;
- and controlling said switch with said burst dimming signal to eliminate audible noise.
Dependencies are inferred from the claim text.