Simple protection circuit and adaptive frequency sweeping method for CCFL inverter
    1.
    发明授权
    Simple protection circuit and adaptive frequency sweeping method for CCFL inverter 失效
    CCFL逆变器简单保护电路和自适应扫频方法

    公开(公告)号:US08063570B2

    公开(公告)日:2011-11-22

    申请号:US12166140

    申请日:2008-07-01

    IPC分类号: H05B37/02 H05B41/36

    CPC分类号: H05B41/2855

    摘要: A CCFL inverter circuit integrates a feedback circuit and protection circuit together. For both in-phase and out-of-phase applications, sensed lamp voltages can be used for open lamp and short lamp detection and sensed currents can be used for open lamp detection. The driving circuit adjusts the open lamp frequency by using a duty cycle control signal so that the driving circuit can always achieve the desired lamp voltage gain.

    摘要翻译: CCFL逆变电路将反馈电路和保护电路集成在一起。 对于同相和异相应用,感测的灯电压可用于开灯和短灯检测,并且感测电流可用于开灯检测。 驱动电路通过使用占空比控制信号来调节开路频率,使得驱动电路总能达到期望的灯电压增益。

    SIMPLE PROTECTION CIRCUIT AND ADAPTIVE FREQUENCY SWEEPING METHOD FOR CCFL INVERTER
    2.
    发明申请
    SIMPLE PROTECTION CIRCUIT AND ADAPTIVE FREQUENCY SWEEPING METHOD FOR CCFL INVERTER 失效
    CCFL逆变器的简单保护电路和自适应频率扫描方法

    公开(公告)号:US20090140655A1

    公开(公告)日:2009-06-04

    申请号:US12166140

    申请日:2008-07-01

    IPC分类号: H05B37/02

    CPC分类号: H05B41/2855

    摘要: A CCFL inverter circuit integrates a feedback circuit and protection circuit together. For both in-phase and out-of-phase applications, sensed lamp voltages can be used for open lamp and short lamp detection and sensed currents can be used for open lamp detection. The driving circuit adjusts the open lamp frequency by using a duty cycle control signal so that the driving circuit can always achieve the desired lamp voltage gain.

    摘要翻译: CCFL逆变电路将反馈电路和保护电路集成在一起。 对于同相和异相应用,感测的灯电压可用于开灯和短灯检测,并且感测电流可用于开灯检测。 驱动电路通过使用占空比控制信号来调节开路频率,使得驱动电路总能达到期望的灯电压增益。

    BRIDGELESS PFC CONVERTER AND THE METHOD THEREOF
    4.
    发明申请
    BRIDGELESS PFC CONVERTER AND THE METHOD THEREOF 审中-公开
    无桥PFC转换器及其方法

    公开(公告)号:US20120293141A1

    公开(公告)日:2012-11-22

    申请号:US13474545

    申请日:2012-05-17

    IPC分类号: G05F1/70

    摘要: A bridgeless PFC (power factor correction) converter with improved efficiency is disclosed. The bridgeless PFC converter comprises: input terminals configured to receive an input AC power supply; an output terminal configured to provide power supply; a high frequency bridge arm comprising a first switch and a third switch coupled between the output terminal and a ground node; a low frequency bridge arm comprising a second switch and a fourth switch coupled between the output terminal and the ground node; an inductor coupled between the input AC power supply and the high frequency bridge arm; and a control circuit configured to control the switching of switches in the high frequency bridge arm and the low frequency bridge arm.

    摘要翻译: 公开了一种提高效率的无桥PFC(功率因数校正)转换器。 所述无桥PFC转换器包括:被配置为接收输入AC电源的输入端; 输出端子,被配置为提供电源; 高频桥臂,包括耦合在输出端和接地节点之间的第一开关和第三开关; 低频桥臂,包括耦合在所述输出端子和所述接地节点之间的第二开关和第四开关; 耦合在输入交流电源和高频桥臂之间的电感器; 以及控制电路,被配置为控制高频桥臂和低频桥臂中的开关的切换。

    DUAL ENDED DRIVER CIRCUIT FOR LCD BACKLIGHT AND THE METHOD THEREOF
    5.
    发明申请
    DUAL ENDED DRIVER CIRCUIT FOR LCD BACKLIGHT AND THE METHOD THEREOF 审中-公开
    用于LCD背光的双端驱动电路及其方法

    公开(公告)号:US20100302288A1

    公开(公告)日:2010-12-02

    申请号:US12787974

    申请日:2010-05-26

    IPC分类号: G09G5/10

    CPC分类号: H05B41/2825

    摘要: A dual ended driver circuit for a LCD backlight is disclosed. The circuit comprises a master board and a slave board, which provides a first output drive signal and a second output drive signal to either end of a lamp set, respectively. The circuit only uses one control chip to synchronize and make symmetrical the first output drive signal and the second output drive signal.

    摘要翻译: 公开了一种用于LCD背光的双端驱动电路。 该电路包括主板和从属板,其分别向灯组的任一端提供第一输出驱动信号和第二输出驱动信号。 该电路仅使用一个控制芯片来同步和对准第一个输出驱动信号和第二个输出驱动信号。

    Bridgeless PFC converter and the method thereof
    6.
    发明授权
    Bridgeless PFC converter and the method thereof 有权
    无桥PFC转换器及其方法

    公开(公告)号:US08766605B2

    公开(公告)日:2014-07-01

    申请号:US13310306

    申请日:2011-12-02

    IPC分类号: H02M7/17

    摘要: A bridgeless PFC (power factor correction) converter with improved efficiency is disclosed. The bridgeless PFC converter comprises: a first input terminal and a second input terminal configured to receive an input AC signal; an output terminal; an inductor set comprising N inductors, wherein a first terminal of each inductor is coupled to the first input terminal; and an output stage comprising (N+1) switching circuits coupled between the output terminal and a ground node.

    摘要翻译: 公开了一种提高效率的无桥PFC(功率因数校正)转换器。 无桥PFC转换器包括:第一输入端和第二输入端,被配置为接收输入的AC信号; 输出端子; 包括N个电感器的电感器组,其中每个电感器的第一端子耦合到所述第一输入端子; 以及输出级,其包括耦合在输出端子和接地节点之间的(N + 1)个开关电路。

    Bridgeless PFC Converter and the Method Thereof
    7.
    发明申请
    Bridgeless PFC Converter and the Method Thereof 有权
    无桥PFC转换器及其方法

    公开(公告)号:US20120139505A1

    公开(公告)日:2012-06-07

    申请号:US13310306

    申请日:2011-12-02

    IPC分类号: G05F1/70

    摘要: A bridgeless PFC (power factor correction) converter with improved efficiency is disclosed. The bridgeless PFC converter comprises: a first input terminal and a second input terminal configured to receive an input AC signal; an output terminal; an inductor set comprising N inductors, wherein a first terminal of each inductor is coupled to the first input terminal; and an output stage comprising (N+1) switching circuits coupled between the output terminal and a ground node.

    摘要翻译: 公开了一种提高效率的无桥PFC(功率因数校正)转换器。 无桥PFC转换器包括:第一输入端和第二输入端,被配置为接收输入的AC信号; 输出端子; 包括N个电感器的电感器组,其中每个电感器的第一端子耦合到所述第一输入端子; 以及输出级,其包括耦合在输出端子和接地节点之间的(N + 1)个开关电路。

    DA/AC convert for driving cold cathode fluorescent lamp
    8.
    发明授权
    DA/AC convert for driving cold cathode fluorescent lamp 失效
    DA / AC转换驱动冷阴极荧光灯

    公开(公告)号:US07825605B2

    公开(公告)日:2010-11-02

    申请号:US11582916

    申请日:2006-10-17

    IPC分类号: H05B41/14

    摘要: The present invention discloses a DC/AC converter in the backlight power supply system using cold cathode fluorescent lamp (CCFL). The DC/AC converter comprises a front end DC/DC converter, a full-bridge or half bridge inverter, and a piezoelectric transformer. Even with a wide range of input voltages, the front end DC/DC converter produces a predetermined DC voltage or a DC voltage with a predetermined small range and the cascaded inverter operates with a switching frequency close to the resonant frequency of the piezoelectric transformer, which helps the backlight power supply system achieve high efficiency.

    摘要翻译: 本发明公开了一种使用冷阴极荧光灯(CCFL)的背光电源系统中的DC / AC转换器。 DC / AC转换器包括前端DC / DC转换器,全桥或半桥逆变器和压电变压器。 即使具有宽范围的输入电压,前端DC / DC转换器产生预定的直流电压或具有预定的小范围的直流电压,并且级联的逆变器以接近压电变压器的谐振频率的开关频率工作,其中 帮助背光源供电系统实现高效率。

    DC/AC convert for driving cold cathode fluorescent lamp
    9.
    发明申请
    DC/AC convert for driving cold cathode fluorescent lamp 失效
    DC / AC转换驱动冷阴极荧光灯

    公开(公告)号:US20070086217A1

    公开(公告)日:2007-04-19

    申请号:US11582916

    申请日:2006-10-17

    IPC分类号: H02M3/335

    摘要: The present invention discloses a DC/AC converter in the backlight power supply system using cold cathode fluorescent lamp (CCFL). The DC/AC converter comprises a front end DC/DC converter, a full-bridge or half bridge inverter, and a piezoelectric transformer. Even with a wide range of input voltages, the front end DC/DC converter produces a predetermined DC voltage or a DC voltage with a predetermined small range and the cascaded inverter operates with a switching frequency close to the resonant frequency of the piezoelectric transformer, which helps the backlight power supply system achieve high efficiency.

    摘要翻译: 本发明公开了一种使用冷阴极荧光灯(CCFL)的背光电源系统中的DC / AC转换器。 DC / AC转换器包括前端DC / DC转换器,全桥或半桥逆变器和压电变压器。 即使具有宽范围的输入电压,前端DC / DC转换器产生预定的直流电压或具有预定的小范围的直流电压,并且级联的逆变器以接近压电变压器的谐振频率的开关频率工作,其中 帮助背光源供电系统实现高效率。

    Circuit and method for striking CCFL
    10.
    发明授权
    Circuit and method for striking CCFL 有权
    撞击CCFL的电路和方法

    公开(公告)号:US08373349B2

    公开(公告)日:2013-02-12

    申请号:US12764830

    申请日:2010-04-21

    IPC分类号: H05B41/16

    CPC分类号: H05B41/282 Y02B20/183

    摘要: A circuit for controlling the switch frequency of an inverter that strikes and drives fluorescent lamps is disclosed. The circuit comprises a frequency generator and an offset circuit. The offset circuit provides a current signal in response to the lamp status. The frequency generator provides a frequency control signal in respond to the current signal so as to control the switch frequency of the inverter. When the lamp is open, the switch frequency of the inverter is higher; when the lamp is lighted, the switch frequency of the inverter is lower.

    摘要翻译: 公开了一种用于控制触发和驱动荧光灯的逆变器的开关频率的电路。 电路包括频率发生器和偏移电路。 偏移电路响应于灯状态而提供电流信号。 频率发生器提供响应于当前信号的频率控制信号,以便控制逆变器的开关频率。 当灯泡打开时,变频器的开关频率较高; 当灯点亮时,变频器的开关频率较低。