Lighting device and lighting system

摘要

Provided is a lighting device which can be dimmed and subjected to change in color temperature of the lighting color in accordance with a dimming level. To the lighting device, AC power under phase-controlled is supplied. The lighting device is provided with a light emitting elements array and a switching unit. The light emitting elements array includes a plurality of light emitting elements, which are two or more types of light emitting elements having different lighting colors. The switching unit switches an electrical connections between the light emitting elements included in the light emitting elements array so as to change the number of light emitting elements inserted in series to a power supply path and the proportion of numbers of light emitting elements per lighting color among the number of the inserted light emitting elements in accordance with a voltage supplied to the light emitting elements array.

主权项

1. A lighting device to which phase controlled AC electric power is supplied, the lighting device comprising:
a rectifying/smoothing circuit that rectifies and soothes the AC electric power; a light-emitting array including a plurality of light-emitting elements that are grouped into two or more sets, each set having one of different lighting colors, the sets being inserted in series to a wiring having two ends in an order of the color temperatures of the lighting colors, one end of the wiring being connected to a positive terminal of the rectifying/smoothing circuit, a plurality of nodes positioned between each pair of sets inserted between the one end and the other end of the wiring, each node being connected, via a respective switch element, to a negative terminal of the rectifying/smoothing circuit; and a switching unit that turns on one of the switch elements in accordance with a voltage level of the phase controlled AC electric power wherein as the voltage is higher, the one of the switch elements that is turned on is on a more distant node from the one end of the wirings.