公开(公告)号：US20160072583A1

公开(公告)日：2016-03-10

申请号：US14843458

申请日：2015-09-02

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Masahiro NARUO ,  Shojirou KIDO

IPC: H04B10/116 ,  H04B10/564 ,  H04B10/079 ,  H05B37/02 ,  H05B33/08

CPC classification number: H04B10/116 ,  H05B33/0845 ,  H05B37/0272

Abstract: A visible light communication modulation circuit includes a modulation resistance circuit configured to change a current flowing through an LED light source by changing a resistance thereof, a measurement circuit configured to simultaneously measure a voltage applied to the LED light source and the current flowing through the LED light source at least twice until the current is stabilized, an calculation circuit configured to obtain an equivalent series resistance of the LED light source based on at least two sets of voltage values and current values and determine a target resistance of the modulation resistance circuit based on the equivalent series resistance and a predetermined modulation degree, and a conversion circuit configured to change the resistance of the modulation resistance circuit based on the target resistance.

Abstract translation: 可见光通信调制电路包括调制电阻电路，其被配置为通过改变其电阻来改变流过LED光源的电流;测量电路，被配置为同时测量施加到LED光源的电压和流过LED的电流 光源至少两次，直到电流稳定为止，计算电路被配置为基于至少两组电压值和电流值获得LED光源的等效串联电阻，并且基于以下方式确定调制电阻电路的目标电阻 等效串联电阻和预定调制度;以及转换电路，被配置为基于目标电阻改变调制电阻电路的电阻。

公开(公告)号：US20160270178A1

公开(公告)日：2016-09-15

申请号：US15047446

申请日：2016-02-18

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Masahiro NARUO ,  Kenichi FUKUDA ,  Shinji MAKIMURA ,  Akira NAKAJO

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0827 ,  H05B33/0866

Abstract: A lighting device that supplies current to light-emitting units includes: a DC-to-DC converter; a switch unit connected to the light-emitting units; and a control circuit which controls the DC-to-DC converter and the switch unit. The DC-to-DC converter includes: an inductor through which current from the DC-to-DC converter is provided to the light-emitting units; and a first switch element connected in series with the inductor and which switches ON/OFF. The control circuit includes: a zero-crossing detector that detects that current flowing in the inductor is substantially zero due to the first switch element switching OFF, and outputs a zero-current detection signal; and a switch controller that selects one of the light-emitting units and controls the switch unit to cause the current from the DC-to-DC converter to be supplied to the selected light-emitting unit when the first switch element subsequently switches ON, each time the switch controller receives the zero-current detection signal.

Abstract translation: 向发光单元供电的照明装置包括：DC-DC转换器; 连接到发光单元的开关单元; 以及控制DC-DC转换器和开关单元的控制电路。 DC-DC转换器包括：电感器，通过该电感器将来自DC-DC转换器的电流提供给发光单元; 以及与电感器串联连接并且接通/断开的第一开关元件。 控制电路包括：过零检测器，其检测由于第一开关元件断开而在电感器中流动的电流基本为零，并输出零电流检测信号; 以及开关控制器，当所述第一开关元件随后接通时，选择所述发光单元中的一个并且控制所述开关单元使得来自所述DC-DC转换器的电流被提供给所选择的发光单元， 时间开关控制器接收零电流检测信号。