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12 条记录 (耗时 0.018 秒)

    DC-AC converter having phase-modulated, double-ended, full-bridge topology for powering high voltage load such as cold cathode fluorescent lamp
    11.
    发明授权
    DC-AC converter having phase-modulated, double-ended, full-bridge topology for powering high voltage load such as cold cathode fluorescent lamp 失效
    DC-AC转换器具有用于为诸如冷阴极荧光灯等高压负载供电的相位调制双端全桥拓扑

    公开(公告)号：US07564193B2

    公开(公告)日：2009-07-21

    申请号：US11175488

    申请日：2005-07-06

    申请人： Robert L. Lyle, Jr. ,  Steven P. Laur ,  Zaki Moussaoui

    发明人： Robert L. Lyle, Jr. ,  Steven P. Laur ,  Zaki Moussaoui

    IPC分类号： H05B41/24

    CPC分类号： H05B41/2828 ,  H05B41/3927

    摘要： A phase-modulated, double-ended, full-bridge topology-based DC-AC converter supplies AC power to a load, such as a cold cathode fluorescent lamp used to back-light a liquid crystal display. First and second converter stages generate respective first and second sinusoidal voltages having the same frequency and amplitude, but having a controlled phase difference therebetween. By employing a voltage controlled delay circuit to control the phase difference between the first and second sinusoidal voltages, the converter is able to vary the amplitude of the composite voltage differential produced across the opposite ends of the load.

    摘要翻译： 一个基于相位调制，双端，全桥拓扑的DC-AC转换器为负载供电，如用于背光液晶显示器的冷阴极荧光灯。 第一和第二转换器级产生具有相同频率和幅度的相应的第一和第二正弦电压，但是它们之间具有受控的相位差。 通过采用电压控制延迟电路来控制第一和第二正弦电压之间的相位差，转换器能够改变在负载的相对端产生的复合电压差的振幅。

    Staggering switching signals for multiple cold cathode fluorescent lamp backlighting system to reduce electromagnetic interference
    12.
    发明授权
    Staggering switching signals for multiple cold cathode fluorescent lamp backlighting system to reduce electromagnetic interference 失效
    多个冷阴极荧光灯背光系统的切换信号交错，以减少电磁干扰

    公开(公告)号：US07141941B2

    公开(公告)日：2006-11-28

    申请号：US10968480

    申请日：2004-10-19

    申请人： Robert L. Lyle, Jr. ,  Lawrence George Pearce

    发明人： Robert L. Lyle, Jr. ,  Lawrence George Pearce

    IPC分类号： H05B37/00 ,  H05B39/00 ,  H05B41/00 ,  H05B37/02 ,  H05B39/04 ,  H05B41/36 ,  G05F1/00

    CPC分类号： H05B41/2824

    摘要： In order to minimize switching-induced electromagnetic interference in a power supply switching circuit of the type used to control the AC power for multiple high voltage devices, such as cold cathode fluorescent lamps employed for backlighting a large scale liquid crystal display, the gating signals that are used to switch lamp-driving inverter circuits ON and OFF are staggered, or slightly offset in time, so that no two switching devices will be switched at the same time. By slightly offset in time is meant that the time differential between any pair of switching signals is relatively small compared to the period of the switching signal frequency. This has the effect of spreading out and thereby diminishing the magnitude of the spectral content of both capacitively and inductively coupled transients that are produced at switching times of the inverter circuits.

    摘要翻译： 为了最小化用于控制多个高压装置（例如用于背光大规模液晶显示器的冷阴极荧光灯）的AC电源的电源开关电路中的开关感应电磁干扰，门控信号 用于开关灯驱动逆变器电路的ON和OFF交错，或稍微偏移时间，因此不会同时切换两个开关装置。 通过稍微偏移的时间是指任何一对开关信号之间的时间差与切换信号频率的周期相比相对较小。 这具有扩展并因此减小在逆变器电路的开关时间产生的电容和电感耦合瞬变的频谱含量的大小。