公开(公告)号：US10057967B1

公开(公告)日：2018-08-21

申请号：US15878116

申请日：2018-01-23

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Daisuke Yamahara ,  Hiroyuki Asano ,  Satoshi Yagi ,  Koki Matsui

IPC: H05B37/00 ,  H05B41/00 ,  H05B37/02

Abstract: A lighting device includes: a first lighting control circuit; a second lighting control circuit which controls the first lighting control circuit; a first control power supply which supplies a first voltage to the first lighting control circuit; a second control power supply to which the first voltage is supplied and which supplies a second voltage to the second lighting control circuit; and a reset circuit which (i) when the reset circuit detects that the first voltage decreases to a first threshold or lower, causes the second control power supply to stop supply of the second voltage, and (ii) when the reset circuit detects that the first voltage increases to a second threshold or higher and that the second voltage is higher than a third threshold, causes the second control power supply to start supply of the second voltage after the second voltage decreases to the third threshold or lower.

公开(公告)号：US09699851B2

公开(公告)日：2017-07-04

申请号：US15171444

申请日：2016-06-02

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Satoshi Yagi ,  Kei Mitsuyasu ,  Shinichiro Goto ,  Tomohiro Sugiura ,  Katsuyoshi Nakada

IPC: H05B33/08 ,  H05B41/392

CPC classification number: H05B33/0845 ,  H05B33/0815 ,  H05B41/3924

Abstract: A dimming lighting circuit includes: a rectifier circuit; a phase detection circuit which outputs a dimming signal having a signal level corresponding to a conduction phase angle of an AC voltage; and a DC-DC converter which receives a DC voltage output from the rectifier circuit and supplies a light source with a DC current corresponding to the signal level of the dimming signal output from the phase detection circuit. If the conduction phase angle detected when the dimming lighting circuit receives the AC voltage at power-on is less than or equal to a predetermined angle, the phase detection circuit outputs, as the dimming signal, a substitute signal having a signal level corresponding to a conduction phase angle greater than the conduction phase angle of the AC voltage, for a predetermined time period.