Patent Number: 9,743,471

Title: Lighting device and lighting fixture for current control with a solid-state lighting element

Abstract: A lighting device which outputs a DC current to a load, the lighting device including: a downconverter circuit which includes a switching element and steps down a DC voltage input to the downconverter circuit; and a controller which controls turning on and off of the switching element, wherein the controller has operating modes including a detection mode in which the controller detects a time taken for a current through the switching element to reach a predetermined value after the switching element turns on, the current through the switching element representing the DC current output to the load.

Inventors: Nakada; Katsuyoshi (Gumma, JP), Ueda; Keisuke (Niigata, JP), Fukuda; Kenichi (Osaka, JP)

Assignee: Panasonic Intellectual Property Management Co., Ltd.

International Classification: H05B 33/08 (20060101); H05B 37/02 (20060101); H02M 3/156 (20060101)

Expiration Date: 2021-08-22 0:00:00