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    • 7. 发明授权
    • LED driver with end-of-life detection circuitry
    • 带有寿命终止检测电路的LED驱动器
    • US08853949B2
    • 2014-10-07
    • US13330987
    • 2011-12-20
    • Katsunobu HamamotoMasafumi YamamotoKeisuke UedaHisaya Takikita
    • Katsunobu HamamotoMasafumi YamamotoKeisuke UedaHisaya Takikita
    • H05B37/02H05B33/08
    • H05B33/0815H05B33/0893Y02B20/346
    • An LED lighting device includes a DC/DC power converter having output terminals coupled to respective lamp sockets. A controller receives signals from a current sensor and a voltage sensor, and controls the DC/DC power converter to increase/decrease an output voltage based on a sensed output current with respect to a target value. A sensed output voltage is compared to predetermined upper and lower limit values, and the DC/DC power converter is disabled when the output voltage exceeds the predetermined upper limit value or falls below the predetermined lower limit. The controller further measures an accumulated lighting time of the device, and after the accumulated lighting time has exceeded a predetermined switching time, decreases the upper limit value monotonously or in increments as the accumulated lighting time passes.
    • LED照明装置包括具有耦合到相应灯插座的输出端的DC / DC功率转换器。 控制器从电流传感器和电压传感器接收信号,并且基于相对于目标值的感测输出电流来控制DC / DC功率转换器来增加/减小输出电压。 将感测的输出电压与预定的上限和下限值进行比较,并且当输出电压超过预定上限值或低于预定下限时,DC / DC功率转换器被禁用。 控制器进一步测量装置的累积点亮时间,并且在累积点亮时间超过预定切换时间之后,随着累积点亮时间的过去,单调或逐渐减小上限值。