US 2014/0152182 A1Published application

Lighting device and luminaire including the same

AssigneePanasonic Corporation

InventorsMasafumi YAMAMOTO, Satoru NAGATA, Masato HIMEDA, Hisaya TAKIKITA, Koki MATSUI

Life of this patent

Estimating the term…

Loading patent…

Abstract

A lighting device (10) includes a voltage converter (2) for generating a predetermined DC voltage, a detector (4) for obtaining a detection voltage corresponding to a predetermined DC voltage applied across a light source (20), a controller (3) for controlling the voltage converter (2) so that a current flowing through the light source (20) is constant, and a determination unit (5) for determining whether the detection voltage is a preset first reference voltage or higher. The first reference voltage is set higher by a specified voltage than the detection voltage, and is set to vary more slowly than the detection voltage. The controller (3) stops an operation of the voltage converter (2) when the detection voltage is determined to be the first reference voltage or higher through the determination unit (5).

Claims20

Dependent claims

A lighting device, configured to be detachably attached with a light source comprising an LED device as a lighting object, the lighting device comprising:

a voltage converter configured to convert a DC voltage supplied from a DC power supply into a predetermined DC voltage;
a detector configured to detect the predetermined DC voltage applied across the light source to generate a detection voltage;
a controller configured to control the voltage converter so that a current flowing through the light source is constant;
and
a determination unit configured to determine whether the detection voltage by the detector is a preset first reference voltage or higher,
wherein the first reference voltage is set higher by a specified voltage than the detection voltage by the detector, and is set to vary more slowly than the detection voltage, and
the controller is configured to stop an operation of the voltage converter when the detection voltage by the detector is determined to be the first reference voltage or higher through the determination unit.

4 more elements

Dependencies are inferred from the claim text.