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。

公开(公告)号：US20170347414A1

公开(公告)日：2017-11-30

申请号：US15606169

申请日：2017-05-26

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Kazuhiko HARADA ,  Akira NAKAJO

IPC: H05B33/08

CPC classification number: H05B33/089 ,  H05B33/0815 ,  H05B33/0845 ,  Y02B20/341

Abstract: The lighting device includes a power conversion circuit and a control circuit. The power conversion circuit includes a high voltage side output terminal and a low voltage side output terminal to be connected to a light source, and a step-down chopper circuit. The control circuit performs a lighting operation of controlling the power conversion circuit to develop a DC output voltage between the high voltage side output terminal and the low voltage side output terminal. The control circuit starts a protective operation of limiting a current to be supplied to the light source when the output voltage is equal to or higher than a threshold value. The threshold value is in a range of 1.2 to 1.3 times a rated voltage of the light source.

公开(公告)号：US20160198532A1

公开(公告)日：2016-07-07

申请号：US14986794

申请日：2016-01-04

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Akira NAKAJO

IPC: H05B33/08 ,  H02M1/42 ,  H05B37/02

CPC classification number: H05B33/0815 ,  H02M1/36 ,  H02M3/3376 ,  H02M2001/0025 ,  H02M2001/0058 ,  H05B33/0851 ,  Y02B20/346 ,  Y02B70/1491

Abstract: Provided is a lighting device including two switching elements, a control circuit, a resonance circuit, a rectification circuit, and a feedback circuit. The control circuit controls two switching elements such that the two switching elements operate separately from each other. The control circuit changes the switching frequencies of the two switching elements from high frequencies to low frequencies, relative to one another, when the operation (switching operation) of the switching elements is started. The control circuit controls the feedback circuit such that the difference output from an error amplifier approaches zero within a period of time from a point of time at which the switching operation is stopped to a point of time at which the switching operation is next started.

Abstract translation: 提供了一种包括两个开关元件，控制电路，谐振电路，整流电路和反馈电路的照明装置。 控制电路控制两个开关元件，使得两个开关元件彼此分开操作。 当开关元件的操作（开关操作）开始时，控制电路相对于彼此将两个开关元件的开关频率从高频变为低频。 控制电路控制反馈电路，使得在从开关操作停止的时间点到接下来开始切换操作的时间点的时间段内，来自误差放大器的差分输出接近零。

公开(公告)号：US20160073457A1

公开(公告)日：2016-03-10

申请号：US14824676

申请日：2015-08-12

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Akira NAKAJO

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0845 ,  Y02B20/346

Abstract: A lighting device includes: a DC/DC converter including two switching elements connected in series and a resonant circuit connected to a connection point between the two switching elements; and a control unit configured to control driving of the two switching elements. The control unit is configured to: perform intermittent driving in which a switching period and a non-switching period are alternately repeated, the switching period being a period in which the control unit switches ON and OFF the two switching elements respectively and inversely; and the non-switching period being a period in which the control unit stops switching ON and OFF the two switching elements; and provide, in an initial part of the switching period, a frequency gradual decrease period in which a driving frequency for driving the two switching elements is gradually decreased.

Abstract translation: 照明装置包括：包括串联连接的两个开关元件和连接到两个开关元件之间的连接点的谐振电路的DC / DC转换器; 以及控制单元，被配置为控制所述两个开关元件的驱动。 所述控制单元被配置为：进行交替重复切换期间和非切换期间的间歇驱动，所述切换期间是所述控制部分别切换所述两个开关元件的开，关的周期; 所述非切换期间是所述控制部停止所述两个开关元件的接通和断开的期间; 并且在开关周期的初始部分提供逐渐减小用于驱动两个开关元件的驱动频率的频率逐渐降低周期。