公开(公告)号：US09814115B2

公开(公告)日：2017-11-07

申请号：US15388217

申请日：2016-12-22

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Shojiro Kido ,  Teruhito Takeda ,  Hiromichi Goto ,  Kazuo Itoh ,  Hiroyuki Nishino ,  Shigeaki Yamasaki

IPC: H04B10/00 ,  H05B33/08 ,  H04B10/50 ,  H04B10/54 ,  H05B37/02 ,  H04J14/00

CPC classification number: H05B33/089 ,  H04B10/116 ,  H04B10/502 ,  H04B10/54 ,  H05B33/0818 ,  H05B33/0866 ,  H05B33/0872 ,  H05B37/0218

Abstract: An illumination light communication apparatus includes: a light source which emits illumination light; a power supply circuit for supplying constant current to the light source; a switch which is connected in series to the light source, and intermittently interrupts current which flows through the light source; a signal generating circuit which generates a binary communication signal which controls on and off of the switch to modulate the illumination light; and a current limiting circuit which is connected in series to the light source and the switch, and limits the current which flows through the light source to prevent the current from exceeding a current set value which is variable.

公开(公告)号：US10530477B2

公开(公告)日：2020-01-07

申请号：US16281142

申请日：2019-02-21

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Hiroyuki Nishino ,  Hiromichi Goto ,  Kazuo Itoh ,  Shojiro Kido ,  Teruhito Takeda

IPC: H04B10/116 ,  H04B10/50 ,  H04B10/54 ,  H05B33/08

Abstract: A visible light communication apparatus includes: an on/off switch connected in series to a load circuit including a light emitting diode; an impedance circuit connected in series to the on/off switch; a feedback circuit that feeds back an error between a voltage drop across the impedance circuit and a reference voltage potential to a voltage source as a feedback signal; a drive circuit that turns on and off the on/off switch in accordance with a communication signal which is a binary signal; an isolation circuit that transmits power while being electrically isolated; and an auxiliary power supply circuit that is connected between two output terminals of the voltage source, generates an auxiliary supply voltage, and supplies power based on the auxiliary supply voltage generated to the on/off switch and the drive circuit via the isolation circuit.