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US 2017/0257916 A1Published application
Lighting device
AssigneeSharp Kabushiki Kaisha
InventorKen SUMITANI
Life of this patent
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Abstract
A lighting device includes a plurality of light sources, a power supply circuit that generates a power supply voltage on the basis of a voltage which is output from an external power supply, and a control circuit that is driven by the power supply voltage. The control circuit detects a drop in the power supply voltage and controls lighting states of the plurality of light sources on the basis of the detection. The power supply voltage is supplied to all or a portion of the plurality of light sources.
Claims6
1-5. (canceled)
A lighting device comprising:
- a plurality of light sources that have different characteristics of emitted light;
- a power supply circuit that generates a power supply voltage on the basis of a voltage which is output from an external power supply;
- and
- a control circuit that is driven by the power supply voltage,
- wherein the control circuit includes a detection unit that detects a drop in the power supply voltage, and a voltage generation unit that generates a power supply voltage for the detection unit for driving the detection unit on the basis of the power supply voltage,
- wherein the voltage generation unit includes a voltage dropping unit and a voltage holding unit,
- wherein the control circuit detects a drop in the power supply voltage by the detection unit and controls lighting states of the plurality of light sources on the basis of the detection,
- wherein the control circuit is operable by only the power supply voltage for the detection unit, and has a function of performing setting to an initial selection state by a drop in the power supply voltage, and
- wherein the power supply voltage is supplied to all or a portion of the plurality of light sources.
6 more elements
Dependencies are inferred from the claim text.