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    • 5. 发明申请
    • METHOD AND APPARATUS FOR AN INTELLIGENT LIGHT EMITTING DIODE DRIVER HAVING POWER FACTOR CORRECTION CAPABILITY
    • 具有功率因数校正能力的智能发光二极管驱动器的方法和装置
    • US20100237786A1
    • 2010-09-23
    • US12649057
    • 2009-12-29
    • Hendrik SantoMatthew D. SchindlerDilip S.Tushar Dhayagude
    • Hendrik SantoMatthew D. SchindlerDilip S.Tushar Dhayagude
    • H05B37/02
    • H05B33/0851G09G3/342H05B33/0842
    • The present invention relates to circuits and methods for controlling one or more LED strings. The circuit comprises a programmable controller coupled to one or more detectors, wherein the one or more detectors are configured to detect one or more measurable parameters of one or more LEDs or LED drivers. The controller is configured to receive information from the one or more detectors related to the one or more measurable parameters and use that information to determine the desired drive voltage for the LED strings. The controller is associated with a power supply having power factor correction (PFC) capability. The controller provides the power supply with a control signal indicative of the desired drive voltage for one or more LED strings. The power supply also receives ac voltage and current waveforms as inputs and performs power factor correction and rectified waveforms related to the ac waveforms. The power supply generates the desired drive voltage based on the control signal.
    • 本发明涉及用于控制一个或多个LED串的电路和方法。 电路包括耦合到一个或多个检测器的可编程控制器,其中所述一个或多个检测器被配置为检测一个或多个LED或LED驱动器的一个或多个可测量的参数。 控制器被配置为从与一个或多个可测量参数相关的一个或多个检测器接收信息,并使用该信息来确定LED串所需的驱动电压。 控制器与具有功率因数校正(PFC)能力的电源相关联。 控制器为电源提供指示一个或多个LED串的期望驱动电压的控制信号。 电源还接收交流电压和电流波形作为输入,并进行与交流波形相关的功率因数校正和整流波形。 电源根据控制信号产生所需的驱动电压。
    • 6. 发明授权
    • Method and circuit for an efficient and scalable constant current source for an electronic display
    • 用于电子显示器的高效且可扩展的恒流源的方法和电路
    • US07598800B2
    • 2009-10-06
    • US11805523
    • 2007-05-22
    • Gurjit S. ThandiDilip SHendrik SantoKien Vi
    • Gurjit S. ThandiDilip SHendrik SantoKien Vi
    • G05F1/10
    • G05F3/205
    • The present invention uses two transistors instead of a sensing resistor to provide a constant current source for a load such as an array of light emitting diodes (“LEDs”). In the present invention, a bias current is applied to a branch of the circuit. The drain-to-source voltages of two transistors are matched. The voltage at the gate of both transistors is controlled based on the bias current and the drain-to-source current of the first of the two transistors. The second of the two transistors is sized such that source current of the second transistor is a multiple of the source current of the first transistor for a given gate voltage. By the techniques of this invention, the load current in a circuit is efficiently kept constant at a multiple of the input bias current.
    • 本发明使用两个晶体管代替感测电阻器来为诸如发光二极管阵列(“LED”)的负载提供恒定电流源。 在本发明中,偏置电流被施加到电路的支路。 两个晶体管的漏极 - 源极电压匹配。 基于两个晶体管中的第一个的偏置电流和漏极 - 源极电流来控制两个晶体管的栅极处的电压。 两个晶体管中的第二个的尺寸使得第二晶体管的源电流对于给定的栅极电压是第一晶体管的源极电流的倍数。 通过本发明的技术,电路中的负载电流被有效地保持恒定在输入偏置电流的倍数。