知搜-全球专利检索

  1. Login
  2. Sign Up

Search Results

16 records (took 0.021 seconds)

    LED DRIVE CIRCUIT
    1.
    发明申请
    LED DRIVE CIRCUIT 有权
    LED驱动电路

    公开(公告)号：US20150382420A1

    公开(公告)日：2015-12-31

    申请号：US14768366

    申请日：2014-02-18

    Applicant: CITIZEN HOLDINGS CO., LTD. ,  CITIZEN ELECTRONICS CO., LTD.

    Inventor： Keisuke Sakai ,  Takashi Akiyama ,  Satoshi Goto ,  Shigehisa Watanabe ,  Tatsuro Yamada

    IPC: H05B33/08

    CPC classification number: H05B33/0824 ,  H05B33/0803 ,  H05B33/0845 ,  H05B41/2828

    Abstract: The purpose of the present invention is to provide an LED drive circuit that is capable of ameliorating insufficient lighting and improving power utilization efficiency. This LED drive circuit is an LED drive circuit wherein the number of LEDs that are turned on varies in accordance with the voltage of a commercial alternating-current power supply, the LED drive circuit being characterized by having an LED row in which multiple LEDs are connected in series, a current detection resistor for detecting a current that flows in the LED row, a bypass circuit that is connected to an intermediate connection part of the LED row, and a current-limiting circuit that is connected to an end of the LED row, wherein the bypass circuit includes a first current-limiting component, the current-limiting circuit includes a second current-limiting component, the first current-limiting component is controlled on the basis of a voltage across the ends of the current detection resistor or a voltage that is obtained by dividing the voltage across the ends of the current detection resistor, and the second current-limiting component is controlled by the divided voltage that is obtained by dividing the current detection resistor.

    Abstract translation: 本发明的目的是提供一种能够改善照明不足并提高功率利用效率的LED驱动电路。 该LED驱动电路是LED驱动电路，其中导通的LED的数量根据商用交流电源的电压而变化，LED驱动电路的特征在于具有连接多个LED的LED行 串联的电流检测电阻器，用于检测在LED行中流动的电流，连接到LED行的中间连接部分的旁路电路和连接到LED行的一端的限流电路 ，其中所述旁路电路包括第一限流部件，所述限流电路包括第二限流部件，所述第一限流部件基于所述电流检测电阻器两端的电压或 通过分压电流检测电阻的两端的电压而获得的电压和第二限流分量由分压为o 通过划分电流检测电阻来获得。

    LED drive circuit
    3.
    发明授权
    LED drive circuit 有权
    LED驱动电路

    公开(公告)号：US09277615B2

    公开(公告)日：2016-03-01

    申请号：US14768366

    申请日：2014-02-18

    Applicant: CITIZEN HOLDINGS CO., LTD. ,  CITIZEN ELECTRONICS CO., LTD.

    Inventor： Keisuke Sakai ,  Takashi Akiyama ,  Satoshi Goto ,  Shigehisa Watanabe ,  Tatsuro Yamada

    IPC: H05B33/08 ,  H05B41/282

    CPC classification number: H05B33/0824 ,  H05B33/0803 ,  H05B33/0845 ,  H05B41/2828

    Abstract: The purpose of the present invention is to provide an LED drive circuit that is capable of ameliorating insufficient lighting and improving power utilization efficiency. This LED drive circuit is an LED drive circuit wherein the number of LEDs that are turned on varies in accordance with the voltage of a commercial alternating-current power supply, the LED drive circuit being characterized by having an LED row in which multiple LEDs are connected in series, a current detection resistor for detecting a current that flows in the LED row, a bypass circuit that is connected to an intermediate connection part of the LED row, and a current-limiting circuit that is connected to an end of the LED row, wherein the bypass circuit includes a first current-limiting component, the current-limiting circuit includes a second current-limiting component, the first current-limiting component is controlled on the basis of a voltage across the ends of the current detection resistor or a voltage that is obtained by dividing the voltage across the ends of the current detection resistor, and the second current-limiting component is controlled by the divided voltage that is obtained by dividing the current detection resistor.

    Abstract translation: 本发明的目的是提供一种能够改善照明不足并提高功率利用效率的LED驱动电路。 该LED驱动电路是LED驱动电路，其中导通的LED的数量根据商用交流电源的电压而变化，LED驱动电路的特征在于具有连接多个LED的LED行 串联的电流检测电阻器，用于检测在LED行中流动的电流，连接到LED行的中间连接部分的旁路电路和连接到LED行的一端的限流电路 ，其中所述旁路电路包括第一限流部件，所述限流电路包括第二限流部件，所述第一限流部件基于所述电流检测电阻器两端的电压或 通过分压电流检测电阻的两端的电压而获得的电压和第二限流分量由分压为o 通过划分电流检测电阻来获得。

    LED module
    8.
    发明授权
    LED module 有权

    公开(公告)号：US10026877B2

    公开(公告)日：2018-07-17

    申请号：US15515334

    申请日：2015-09-29

    Applicant: CITIZEN WATCH CO., LTD. ,  CITIZEN ELECTRONICS CO., LTD.

    Inventor： Takashi Akiyama ,  Tatsuro Yamada ,  Satoshi Goto

    IPC: H01L33/00 ,  H01L33/50 ,  H01L25/075 ,  H01L33/62 ,  H01L33/54 ,  H01L33/56 ,  H05B33/08

    Abstract: An LED module according to the present invention includes: a mounting substrate; a first LED group including a plurality of LEDs mounted in a first light-emitting area extending in a first direction on the mounting substrate; a second LED group including a plurality of LEDs mounted in a second light-emitting area located outside the first light-emitting area; a dam material surrounding a periphery of the second light-emitting area; a first fluorescent resin coating the first LED group and causing the first light-emitting area to emit light having a first color temperature; and a second fluorescent resin coating at least the second LED group and causing the second light-emitting area to emit light having a second color temperature higher than the first color temperature, and viscosity of the first fluorescent resin is higher than viscosity of the second fluorescent resin.

    LED DRIVER CIRCUIT
    10.
    发明申请
    LED DRIVER CIRCUIT 有权

    公开(公告)号：US20170290111A1

    公开(公告)日：2017-10-05

    申请号：US15510431

    申请日：2015-09-11

    Applicant: CITIZEN ELECTRONICS CO., LTD. ,  CITIZEN WATCH CO., LTD.

    Inventor： Takashi Akiyama ,  Tatsuro Yamada ,  Satoshi Goto

    IPC: H05B33/08 ,  H05B37/02

    CPC classification number: H05B33/0812 ,  H05B33/0824 ,  H05B33/0827 ,  H05B33/0845 ,  H05B33/0857 ,  H05B33/0866 ,  H05B37/02

    Abstract: The purpose of the present invention is to provide an LED driving circuit with which it is possible to easily manage the color temperature by adjusting light. An LED driving circuit, characterized in having: a first LED group in which a plurality of first LEDs are serially connected, the first LED group contributing to emission of light having a first color temperature; a second LED group in which a plurality of second LEDs are serially connected, the second LED group contributing to emission of light having a second color temperature; a third LED group in which a plurality of second LEDs are serially connected, the second LED group contributing to emission of light having the second color temperature; and a control unit for switching, in response to an increase in a rectified output voltage, from illumination of only the first LED group to illumination of only the second LED group and then from illumination of only the second LED group to illumination of the second LED group and the third LED group, the number of first LEDs included in the first LED group being less than the number of second LEDs included in the second LED group.

Patent Agency Ranking