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    • 21. 发明申请
    • LED LIGHT EMITTING DEVICE AND METHOD OF DRIVING THE SAME
    • LED发光装置及其驱动方法
    • US20110001433A1
    • 2011-01-06
    • US12825635
    • 2010-06-29
    • Dong-Hun LEEKyung-Goo LeeHong-Gyu HanJung-Won KimDong-Hee Kim
    • Dong-Hun LEEKyung-Goo LeeHong-Gyu HanJung-Won KimDong-Hee Kim
    • H05B37/02
    • H05B33/0815H05B33/0827Y02B20/347
    • An LED light emitting device and a method of driving the same are provided, and technology that can uniformly sustain the magnitude of a channel current flowing to a plurality of LED channels is disclosed. The LED light emitting device includes: a plurality of LED channels that are formed with a plurality of LED elements that are continuously connected in series; and a constant current source that controls each channel current flowing to the plurality of LED channels according to a predetermined channel reference current to be a predetermined setting channel current, wherein the constant current source includes a plurality of operating amplifiers that control the magnitude of each of the channel currents, and a feedback voltage generating according to a predetermined offset reference current is input to a second input terminal of an operating amplifier for an offset setting period that sets an offset voltage of the plurality of operating amplifiers, a reference voltage generating according to a channel reference current is input to a first input terminal of the operating amplifier, and an offset voltage of each of the plurality of operating amplifiers is set so that an actual channel current may be identical to a predetermined setting channel current.
    • 提供了一种LED发光器件及其驱动方法,并且公开了能够均匀地维持流向多个LED通道的沟道电流的大小的技术。 LED发光装置包括:多个LED通道,其形成有连续串联连接的多个LED元件; 以及恒定电流源,其根据预定的通道参考电流来控制流向所述多个LED通道的每个通道电流为预定设定通道电流,其中所述恒流源包括多个运算放大器,所述多个运算放大器控制每个 根据预定的偏移参考电流产生的通道电流和反馈电压被输入到运算放大器的第二输入端,用于设置多个运算放大器的偏移电压的偏移设置周期,根据 通道参考电流被输入到运算放大器的第一输入端,并且设置多个运算放大器中的每一个的偏移电压,使得实际的通道电流可以与预定的设定通道电流相同。
    • 27. 发明授权
    • Switching power supply device and method
    • 开关电源装置及方法
    • US07035122B2
    • 2006-04-25
    • US10920816
    • 2004-08-18
    • Jung-Won KimDong-Young Huh
    • Jung-Won KimDong-Young Huh
    • H02M3/335
    • H02M3/33507H02M2001/0048Y02B70/1491
    • A switching power supply includes a switch, a bias-sensor to sense the switch-voltage, and a zero-crossing detector (ZCD) to sense time instances when the bias-sensor voltage crosses zero. ZCD generates a ZCD-signal, which transitions between a first and a second level at the sensed crossing instances, with a delay. ZCD-signal is coupled to a blanking circuit, generating a blank-signal and a pulse-signal, controlling the switch. The on-time of the switch can be modified by the input voltage and load. The blank-signal between on-times is adjusted to compensate for this modification, keeping the switching frequency below a predetermined limit and reducing the switching frequency. The switching power supply further includes a pulse width modulation (PWM) signal generator, coupled to the blanking circuit and to the switch. PWM signal generator turns on the switch controlled by the pulse-signal of the blanking circuit. Blanking circuit is controlled by either the on-time or a control voltage and input voltage.
    • 开关电源包括开关,感测开关电压的偏置传感器,以及当偏置传感器电压跨越零时检测时间实例的过零检测器(ZCD)。 ZCD产生一个ZCD信号,该ZCD信号在感测到的交叉实例处在第一和第二电平之间以延迟转换。 ZCD信号耦合到消隐电路,产生空白信号和脉冲信号,控制开关。 可以通过输入电压和负载来修改开关的导通时间。 调整接通时间之间的空白信号以补偿该修改,保持开关频率低于预定限制并降低开关频率。 开关电源还包括脉冲宽度调制(PWM)信号发生器,耦合到消隐电路和开关。 PWM信号发生器接通由消隐电路的脉冲信号控制的开关。 消隐电路由导通时间或控制电压和输入电压控制。