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    • 8. 发明申请
    • LED DRIVE DEVICE AND LED ILLUMINATING DEVICE
    • LED驱动器件和LED照明器件
    • US20120306386A1
    • 2012-12-06
    • US13153766
    • 2011-06-06
    • Kazunori Oshima
    • Kazunori Oshima
    • H05B37/02
    • H05B33/0887H05B33/0812
    • An LED drive device whose power dissipation can be effectively reduced without halting current supply to an LED row as well as an LED illuminating device with the LED drive device incorporated therein. When an LED 21A making up an LED row 3A has developed a short-circuit fault, a voltage corresponding to a forward voltage which has been applied to the faulty LED 21A is impressed additionally to an FET 31A for electric power consumption thereof to increase to not less than a certain value. At this time, a power limiting circuit 6A varies a potential, being a reference value of a constant current circuit 7A, at a connecting point between voltage dividing resistors 46A, 47A and then continues to supply a certain level of a current IF1 to the LED row 3A so as to keep the remaining fault-free LEDs 22A to 26A lighting. Consequently, in the event of a short-circuit fault of the LED 21A, the adverse effect caused by discontinuing the current supply to the LED row 3A can be swept away.
    • 一种LED驱动装置,其功率消耗可以有效降低,而不会停止对LED行的电流供应以及LED驱动装置并入其中的LED照明装置。 当构成LED行3A的LED 21A发生短路故障时,与施加到故障LED 21A的正向电压相对应的电压另外施加到FET 31A以供其消耗电力而增加到不 小于一定值。 此时,功率限制电路6A在分压电阻器46A,47A的连接点处改变作为恒流电路7A的基准值的电位,然后继续向LED提供一定电平的电流IF1 行3A,以便保持剩余的无故障LED 22A至26A照明。 因此,在LED 21A发生短路故障的情况下,可以将不连续向LED列3A供电的不利影响除去。