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1. (WO2018123056) LIGHTING DEVICE AND ILLUMINATION APPARATUS

Pub. No.:    WO/2018/123056    International Application No.:    PCT/JP2016/089196
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Thu Dec 29 00:59:59 CET 2016
IPC: H05B 37/02
H02M 7/06
Applicants: MITSUBISHI ELECTRIC CORPORATION
三菱電機株式会社
MITSUBISHI ELECTRIC LIGHTING CORPORATION
三菱電機照明株式会社
Inventors: IIDA, Takeshi
飯田 岳秋
ITO, Yuichiro
伊藤 雄一郎
Title: LIGHTING DEVICE AND ILLUMINATION APPARATUS
Abstract:
A lighting device (100) according to the present invention is provided with: a rectification circuit (3) which rectifies AC power; a DC conversion circuit (30) which inhibits higher harmonics of a current and improves the power factor, and converts the power outputted from the rectification circuit (3) into DC power, and supplies the DC power to a light source; and a control unit (9) which controls the DC conversion circuit (30). The DC conversion circuit (30) is provided with: a smoothing capacitor (6); a MOSFET (51) which is disposed between the smoothing capacitor (6) and the rectification circuit (3); and a coil (52) through which the current outputted from the rectification circuit (3) flows. The control unit (9) sets the MOSFET (51) in an off state from the point in time at which the current flowing through the coil (52) becomes zero, until a delay time set in the control unit (9) elapses, and turns on the MOSFET (51) when the delay time has elapsed.