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    LED driver circuit with open load detection and associated control method
    1.
    发明授权
    LED driver circuit with open load detection and associated control method 有权
    LED驱动电路具有开路负载检测及相关控制方法

    公开(公告)号：US08502463B2

    公开(公告)日：2013-08-06

    申请号：US13031836

    申请日：2011-02-22

    申请人： Hiromitsu Mizukawa ,  Kazuhiro Kumada ,  Yoshifumi Kuroki

    发明人： Hiromitsu Mizukawa ,  Kazuhiro Kumada ,  Yoshifumi Kuroki

    IPC分类号： H05B39/02

    CPC分类号： H05B33/089 ,  H05B33/0815 ,  Y02B20/347

    摘要： An LED driver circuit prevents an increase in output voltage of a DC/DC converter in an open circuit condition associated with removal or failure of an LED lighting device. A DC power source provides a first DC voltage across positive and negative voltage rails. A DC/DC converter includes a switching element which when turned ON/OFF provides a second DC voltage across first and second ends of a capacitor which further define first and second LED lighting device connection terminals. A control circuit, upon receiving a drive power signal, turns ON/OFF the switching element to provide constant current control. A power supply circuit is coupled between the second LED lighting device connection terminal and the negative voltage rail and generates the drive power signal to the control circuit during a detected lighting condition. The power supply circuit further disables the drive power signal during a detected open circuit condition.

    摘要翻译： LED驱动器电路防止在与LED照明装置的去除或故障相关的开路状态下DC / DC转换器的输出电压增加。 直流电源在正负电压轨上提供第一直流电压。 DC / DC转换器包括开关元件，其在接通/断开时提供跨越电容器的第一和第二端的第二DC电压，其进一步限定第一和第二LED照明器件连接端子。 控制电路在接收到驱动功率信号时，将开关元件接通/断开，以提供恒定的电流控制。 电源电路耦合在第二LED照明装置连接端子和负电压轨道之间，并且在检测到的照明条件期间产生到控制电路的驱动电力信号。 在检测到的开路状态期间，电源电路进一步禁止驱动电力信号。

    POWER SUPPLY
    2.
    发明申请
    POWER SUPPLY 有权
    电源

    公开(公告)号：US20120268028A1

    公开(公告)日：2012-10-25

    申请号：US13449584

    申请日：2012-04-18

    申请人： Kazuhiro KUMADA ,  Yosikazu Kado ,  Satoru Nagata ,  Kazuhiro Nisimoto

    发明人： Kazuhiro KUMADA ,  Yosikazu Kado ,  Satoru Nagata ,  Kazuhiro Nisimoto

    IPC分类号： H05B37/02

    CPC分类号： H05B33/0815 ,  H02H9/002 ,  H05B33/0818 ,  H05B33/0845 ,  H05B33/0887

    摘要： A power supply includes: a step-down chopper unit for stepping down a DC voltage from a DC power source to a voltage required for lighting; and a dimming control unit which dims the light source by alternately repeating a switching ON period during which a drive signal having a frequency higher than that of the dimming signal is supplied to the switching element and a switching OFF period during which the supply of the drive signal to the switching element is stopped. Further, the power supply includes an inrush current prevention unit for preventing an inrush current occurring when the DC power source is turned on, and a compensation unit which applies a drive voltage to the thyristor in the switching OFF period.

    摘要翻译： 电源包括：降压斩波器单元，用于将直流电压从直流电源降压到照明所需的电压; 以及调光控制单元，其通过交替地重复将具有高于调光信号的频率的驱动信号提供给开关元件的开关导通时段来调光光源，以及切换期间，在该期间，驱动器的供给 停止对开关元件的信号。 此外，电源包括浪涌电流防止单元，用于防止在直流电源接通时产生的浪涌电流;以及补偿单元，其在切换关闭期间向晶闸管施加驱动电压。

    LIGHTING DEVICE, BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE
    7.
    发明申请
    LIGHTING DEVICE, BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE 审中-公开
    照明装置，背光单元和液晶显示装置

    公开(公告)号：US20110260620A1

    公开(公告)日：2011-10-27

    申请号：US12677908

    申请日：2008-09-16

    申请人： Kazuhiro Kumada ,  Shigeru Ido

    发明人： Kazuhiro Kumada ,  Shigeru Ido

    IPC分类号： H05B39/04

    CPC分类号： H05B41/295 ,  G09G3/342 ,  G09G2300/0426 ,  G09G2310/0237 ,  G09G2310/024 ,  G09G2310/08 ,  G09G2320/064 ,  G09G2330/06 ,  H05B41/2827

    摘要： A lighting device has: a lighting circuit for lighting a plurality of hot-cathode lamps having filaments at both ends; preheating circuits for preheating the individual filaments of the hot-cathode lamps; at least one first circuit substrate arranged near filaments on one side of the hot-cathode lamps; and at least one second circuit substrate arranged near filaments on the other side of the hot-cathode lamps. The lighting circuit is packaged in either the first circuit substrate or the second circuit substrate, and the preheating circuits are packaged or wired by being divided in the first circuit substrate and the second circuit substrate.

    摘要翻译： 照明装置具有：点亮电路，用于点亮在两端具有细丝的多个热阴极灯; 用于预热热阴极灯的单根细丝的预热回路; 至少一个第一电路衬底，布置在所述热阴极灯的一侧上的灯丝附近; 以及布置在所述热阴极灯的另一侧上的灯丝附近的至少一个第二电路衬底。 照明电路被封装在第一电路基板或第二电路基板中，并且预热电路通过被划分在第一电路基板和第二电路基板中而被封装或布线。

    BACKLIGHT UNIT AND LAMP FOR BACKLIGHT UNIT
    8.
    发明申请
    BACKLIGHT UNIT AND LAMP FOR BACKLIGHT UNIT 审中-公开
    背光单元和背光单元灯

    公开(公告)号：US20090059562A1

    公开(公告)日：2009-03-05

    申请号：US11909067

    申请日：2006-03-29

    申请人： Takashi Maniwa ,  Hirofumi Yamashita ,  Kazuhiro Kumada

    发明人： Takashi Maniwa ,  Hirofumi Yamashita ,  Kazuhiro Kumada

    IPC分类号： G09F13/08

    CPC分类号： G02F1/133608 ,  G02F1/133604 ,  G02F1/133611 ,  H01J61/325

    摘要： The present invention is a backlight unit 1 in which multiple substantially U-shaped lamps, to each of whose respective both end portions 11a and 11b an electrode 12 is attached, are disposed in parallel to one another in an envelope 20 in a manner that the end portions 11a and 11b of each lamp 10 face opposite to the end portions 11a and 11b of the adjacent lamp 10 and are positioned closer to a side wall 42/44 of the envelope 20 than a bent portion 13 of the adjacent lamp 10 is. Herewith, it is possible to offer the backlight unit 1 realizing reduced unevenness in luminance and requiring less power consumption.

    摘要翻译： 本发明是一种背光单元1，其中多个基本上为U形的灯，其各自的相应的两个端部11a和11b中的每一个都附接有电极12，彼此平行地设置在外壳20中， 每个灯10的端部11a和11b与相邻灯10的端部11a和11b相对，并且比相邻灯10的弯曲部分13更靠近外壳20的侧壁42/44。 因此，可以提供背光单元1，从而实现降低的亮度不均匀性并且需要较少的功耗。

    Power supply
    9.
    发明授权
    Power supply 有权
    电源

    公开(公告)号：US08604707B2

    公开(公告)日：2013-12-10

    申请号：US13449584

    申请日：2012-04-18

    申请人： Kazuhiro Kumada ,  Yosikazu Kado ,  Satoru Nagata ,  Kazuhiro Nisimoto

    发明人： Kazuhiro Kumada ,  Yosikazu Kado ,  Satoru Nagata ,  Kazuhiro Nisimoto

    IPC分类号： H05B37/02

    CPC分类号： H05B33/0815 ,  H02H9/002 ,  H05B33/0818 ,  H05B33/0845 ,  H05B33/0887

    摘要： A power supply includes: a step-down chopper unit for stepping down a DC voltage from a DC power source to a voltage required for lighting; and a dimming control unit which dims the light source by alternately repeating a switching ON period during which a drive signal having a frequency higher than that of the dimming signal is supplied to the switching element and a switching OFF period during which the supply of the drive signal to the switching element is stopped. Further, the power supply includes an inrush current prevention unit for preventing an inrush current occurring when the DC power source is turned on, and a compensation unit which applies a drive voltage to the thyristor in the switching OFF period.

    摘要翻译： 电源包括：降压斩波器单元，用于将直流电压从直流电源降压到照明所需的电压; 以及调光控制单元，其通过交替地重复将具有高于调光信号的频率的驱动信号提供给开关元件的开关导通时段来调光光源，以及切换期间，在该期间，驱动器的供给 停止对开关元件的信号。 此外，电源包括浪涌电流防止单元，用于防止在直流电源接通时产生的浪涌电流;以及补偿单元，其在切换关闭期间向晶闸管施加驱动电压。

    LED DRIVER CIRCUIT WITH OPEN LOAD DETECTION AND ASSOCIATED CONTROL METHOD
    10.
    发明申请
    LED DRIVER CIRCUIT WITH OPEN LOAD DETECTION AND ASSOCIATED CONTROL METHOD 有权
    具有开路负载检测和相关控制方法的LED驱动电路

    公开(公告)号：US20110204823A1

    公开(公告)日：2011-08-25

    申请号：US13031836

    申请日：2011-02-22

    申请人： Hiromitsu Mizukawa ,  Kazuhiro Kumada ,  Yoshifumi Kuroki

    发明人： Hiromitsu Mizukawa ,  Kazuhiro Kumada ,  Yoshifumi Kuroki

    IPC分类号： H05B41/285

    CPC分类号： H05B33/089 ,  H05B33/0815 ,  Y02B20/347

    摘要： An LED driver circuit prevents an increase in output voltage of a DC/DC converter in an open circuit condition associated with removal or failure of an LED lighting device. A DC power source provides a first DC voltage across positive and negative voltage rails. A DC/DC converter includes a switching element which when turned ON/OFF provides a second DC voltage across first and second ends of a capacitor which further define first and second LED lighting device connection terminals. A control circuit, upon receiving a drive power signal, turns ON/OFF the switching element to provide constant current control. A power supply circuit is coupled between the second LED lighting device connection terminal and the negative voltage rail and generates the drive power signal to the control circuit during a detected lighting condition. The power supply circuit further disables the drive power signal during a detected open circuit condition.

    摘要翻译： LED驱动器电路防止在与LED照明装置的去除或故障相关的开路状态下DC / DC转换器的输出电压增加。 直流电源在正负电压轨上提供第一直流电压。 DC / DC转换器包括开关元件，其在接通/断开时提供跨越电容器的第一和第二端的第二DC电压，其进一步限定第一和第二LED照明器件连接端子。 控制电路在接收到驱动功率信号时，将开关元件接通/断开，以提供恒定的电流控制。 电源电路耦合在第二LED照明装置连接端子和负电压轨道之间，并且在检测到的照明条件期间产生到控制电路的驱动电力信号。 在检测到的开路状态期间，电源电路进一步禁止驱动电力信号。