Circuit for driving lighting apparatus and method thereof
AssigneeMagnaChip Semiconductor, Ltd.
InventorsGyu Ho LIM, Tae Il YUN, Beom Seon RYU
Life of this patent
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Abstract
A circuit for driving a lighting apparatus is provided. The circuit includes a valley signal generator configured to generate a valley signal based on an input voltage, an input voltage determining unit configured to determine whether the input voltage corresponds to a direct voltage or a full-wave rectified AC voltage based on the valley signal, an AC voltage simulation unit configured to generate a virtual valley signal when the input voltage is a DC voltage, and a switching device controller configured to control a switching device used to drive an LED module based the determination and at least one of the valley signal and virtual valley signal.
Claims14
A circuit for driving a lighting apparatus, comprising:
- a valley signal generator configured to generate a valley signal based on an input voltage;
- an input voltage determining unit configured to determine whether the input voltage corresponds to a direct voltage or a full-wave rectified AC voltage based on the valley signal;
- an AC voltage simulation unit configured to generate a virtual valley signal when the input voltage is a DC voltage;
- and
- a switching device controller configured to control a switching device used to drive an LED module based the determination and at least one of the valley signal and virtual valley signal.
A method for driving a lighting apparatus, comprising:
- generating a valley signal based on an input voltage;
- determining whether the input voltage corresponds to a direct voltage or a full-wave rectified AC voltage based on the valley signal;
- generating a virtual valley signal when the input voltage is a DC voltage;
- and
- controlling a switching device used to drive an LED module based the determination and at least one of the valley signal and virtual valley signal.
A lighting circuit comprising:
- a driving circuit configured to generate a valley signal in response to receiving an AC voltage and a virtual valley signal in response to receiving a DC voltage, and control a switching device that providing a driving current when switched on based on at least one of the valley signal and the virtual valley signal;
- and
- a light emitting diode (LED) unit configured to receive the driving current at an inductor when the switching device is switched on, wherein the inductor acts as a current source to an LED module when the switching device is switched off.
Dependencies are inferred from the claim text.