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。