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    • 1. 发明授权
    • Light emitting element drive device
    • 发光元件驱动装置
    • US08779692B2
    • 2014-07-15
    • US13445546
    • 2012-04-12
    • Kazunori OshimaHironobu Masuoka
    • Kazunori OshimaHironobu Masuoka
    • H05B37/02H05B33/08
    • H05B33/0887Y02B20/341
    • A light emitting element drive device includes a light emitting unit that includes a light emitting element and that performs dimming based on a pulse width modulation (PWM) signal, a first switching element that is turned ON or OFF based on the PWM signal and that is connected in series to the light emitting unit, and a protection circuit that includes a charging circuit and a second switching element. The second switching element is turned ON when a first voltage obtained by a charging operation of the charging circuit is equal to or more than a first predetermined value. The charging circuit discharges electric charge through the first switching element when a second voltage between input and output terminals of the first switching element drops. The first switching element is turned OFF despite the existence of the PWM signal when the second switching element is turned ON.
    • 发光元件驱动装置包括:发光单元,其包括发光元件,并且基于脉宽调制(PWM)信号进行调光;基于PWM信号接通或断开的第一开关元件,即, 串联连接到发光单元,以及保护电路,其包括充电电路和第二开关元件。 当通过充电电路的充电操作获得的第一电压等于或大于第一预定值时,第二开关元件接通。 当第一开关元件的输入和输出端之间的第二电压下降时,充电电路通过第一开关元件放电电荷。 当第二开关元件接通时,第一开关元件关闭,尽管存在PWM信号。
    • 3. 发明授权
    • Load drive device for expanding range of output power
    • 负载驱动装置扩大输出功率范围
    • US08604770B2
    • 2013-12-10
    • US13166944
    • 2011-06-23
    • Kazunori Oshima
    • Kazunori Oshima
    • G05F1/00
    • H05B33/0815H05B33/0824H05B33/0851
    • A load drive device capable of expanding a range of an output power by improving a linearity thereof when the output power varies. This device includes an output circuit (14) for supplying an electric power to an LED (10), a feedback circuit (28) for turning on or off the electric power supplied to the LED (10) according to a duty ratio of a burst signal to control the electric power and generating a control value for controlling the LED (10) based on an A/D-converted value obtained by detecting an output current (Iout) to the LED (10) to send out the control value to the output circuit when the supply of the electric power is in an on-state, a burst signal previous value correcting circuit (64) for correcting a presently generated control value (y) based on the A/D-converted value (V) and the previous control value (x) which are generated every cycle of the burst signal, and a duty ratio determination circuit (66) for allowing the burst signal previous value correcting circuit (64) to operate upon determining that the duty ratio of the burst signal goes above or below a reference value.
    • 一种负载驱动装置,其能够通过在输出功率变化时提高其线性度来扩大输出功率的范围。 该装置包括用于向LED(10)提供电力的输出电路(14),用于根据突发的占空比打开或关闭提供给LED(10)的电力的反馈电路(28) 信号以控制电力,并且基于通过检测到LED(10)的输出电流(Iout)而获得的A / D转换值,产生用于控制LED(10)的控制值,以将控制值发送到 输出电路,当电力供应处于导通状态时,用于基于A / D转换值(V)校正当前生成的控制值(y)的脉冲信号前一值校正电路(64)和 在脉冲串信号的每个周期产生的先前控制值(x)以及用于在确定脉冲串信号的占空比为止时允许脉冲信号前一值校正电路(64)工作的占空比确定电路(66) 高于或低于参考值。
    • 5. 发明申请
    • LIGHT EMITTING ELEMENT DRIVE DEVICE
    • 发光元件驱动装置
    • US20120262070A1
    • 2012-10-18
    • US13445546
    • 2012-04-12
    • Kazunori OSHIMAHironobu MASUOKA
    • Kazunori OSHIMAHironobu MASUOKA
    • H05B37/02
    • H05B33/0887Y02B20/341
    • A light emitting element drive device includes a light emitting unit that includes a light emitting element and that performs dimming based on a pulse width modulation (PWM) signal, a first switching element that is turned ON or OFF based on the PWM signal and that is connected in series to the light emitting unit, and a protection circuit that includes a charging circuit and a second switching element. The second switching element is turned ON when a first voltage obtained by a charging operation of the charging circuit is equal to or more than a first predetermined value. The charging circuit discharges electric charge through the first switching element when a second voltage between input and output terminals of the first switching element drops. The first switching element is turned OFF despite the existence of the PWM signal when the second switching element is turned ON.
    • 发光元件驱动装置包括:发光单元,其包括发光元件,并且基于脉宽调制(PWM)信号进行调光;基于PWM信号接通或断开的第一开关元件,即, 串联连接到发光单元,以及保护电路,其包括充电电路和第二开关元件。 当通过充电电路的充电操作获得的第一电压等于或大于第一预定值时,第二开关元件接通。 当第一开关元件的输入和输出端之间的第二电压下降时,充电电路通过第一开关元件放电电荷。 当第二开关元件接通时,第一开关元件关闭,尽管存在PWM信号。
    • 6. 发明申请
    • LIGHT-EMITTING ELEMENT DRIVE DEVICE
    • 发光元件驱动装置
    • US20110309767A1
    • 2011-12-22
    • US13162086
    • 2011-06-16
    • Kazunori OSHIMA
    • Kazunori OSHIMA
    • H05B37/02
    • H05B33/0845
    • A light-emitting element drive device capable of expanding a dimming range of a light-emitting element, enabling a constant minimum dimmed luminance to be obtained irrespective of individual differences between devices. A burst signal generating circuit 12 generates a burst signal Vburst which is a PWM dimming signal generated based on a dimming analogue voltage Vbr indicating a dimming level. This circuit 12 includes an oscillating circuit 24 for generating a triangle wave signal Tri ref, a differentiating circuit 28 for detecting a peak of the triangle wave signal Tri ref, the one-shot timer 30 for generating a signal S2 having pulse width of the duration τ (tau), starting point of which is a peak of the triangle wave signal Tri ref, corresponding to the minimum dimmed luminance of the LED 10, and a NAND circuit 32 for generating the burst signal Vburst based on the comparative result between the voltage level at the triangle wave signal Tri ref and the analogue voltage Vbr when the analogue voltage Vbr does not exceed a predetermined voltage or the burst signal Vburst having pulse width of the duration τ (tau) based on the signal S2 when the analogue voltage Vbr exceeds a predetermined voltage.
    • 一种能够扩大发光元件的调光范围的发光元件驱动装置,能够获得恒定的最小调光亮度,而与设备之间的个体差异无关。 突发信号发生电路12产生突发信号Vburst,其是基于指示调光电平的调光模拟电压Vbr产生的PWM调光信号。 该电路12包括用于产生三角波信号Tri ref的振荡电路24,用于检测三角波信号Tri ref的峰值的微分电路28,用于产生具有持续时间脉冲宽度的信号S2的单触发定时器30 τ(τ),其起点是对应于LED 10的最小调光亮度的三角波信号Tri ref的峰值,以及用于产生突发信号Vburst的NAND电路32,其基于电压 当模拟电压Vbr不超过预定电压时,三角波信号Tri ref和模拟电压Vbr的电平或者当模拟电压Vbr超过时基于信号S2的脉冲宽度为τ(τ)的脉冲宽度的脉冲串信号Vburst 预定电压。
    • 10. 发明授权
    • LED drive device and LED illuminating device
    • LED驱动装置和LED照明装置
    • US08766546B2
    • 2014-07-01
    • 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。