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    CURRENT BALANCING CIRCUITS FOR LIGHT-EMITTING-DIODE-BASED ILLUMINATION SYSTEMS
    2.
    发明申请
    CURRENT BALANCING CIRCUITS FOR LIGHT-EMITTING-DIODE-BASED ILLUMINATION SYSTEMS 审中-公开
    用于发光二极管照明系统的电流平衡电路

    公开(公告)号：WO2013090747A1

    公开(公告)日：2013-06-20

    申请号：PCT/US2012/069792

    申请日：2012-12-14

    Applicant: MARVELL WORLD TRADE LTD. ,  SUTARDJA, Sehat ,  KRISHNAMOORTHY, Ravishanker

    Inventor： SUTARDJA, Sehat ,  KRISHNAMOORTHY, Ravishanker

    IPC: H05B33/08

    CPC classification number: H05B33/086 ,  F21K9/64 ,  H05B33/0827 ,  H05B33/083 ,  H05B33/0845 ,  H05B33/0857 ,  H05B33/0863 ,  H05B33/0866 ,  H05B37/02

    Abstract: A system including a first transistor, a second transistor, and a comparator. The first transistor is configured to supply a first current to a first load connected to a first terminal of the first transistor. The second transistor is configured to supply a second current to a second load connected to a first terminal of the second transistor, wherein the first current and the second current have a predetermined ratio. The comparator is configured to compare a voltage at the first terminal of the first transistor or a voltage at the first terminal of the second transistor to a reference voltage, and to adjust, based on the comparison, biasing of the first transistor and the second transistor to maintain the predetermined ratio between the first current and the second current.

    Abstract translation: 一种包括第一晶体管，第二晶体管和比较器的系统。 第一晶体管被配置为向连接到第一晶体管的第一端子的第一负载提供第一电流。 第二晶体管被配置为向连接到第二晶体管的第一端子的第二负载提供第二电流，其中第一电流和第二电流具有预定的比率。 比较器被配置为将第一晶体管的第一端子处的电压或第二晶体管的第一端子处的电压与参考电压进行比较，并且基于比较来调整第一晶体管和第二晶体管的偏置 以保持第一电流和第二电流之间的预定比率。

    BACK-EMF DETECTION FOR MOTOR CONTROL
    3.
    发明申请
    BACK-EMF DETECTION FOR MOTOR CONTROL 审中-公开
    用于电机控制的反电动势检测

    公开(公告)号：WO2012035434A3

    公开(公告)日：2013-03-28

    申请号：PCT/IB2011002606

    申请日：2011-09-01

    Applicant: MARVELL WORLD TRADE LTD ,  KRISHNAMOORTHY RAVISHANKER ,  LEONG FOO LENG ,  SUSANTO EDY

    Inventor： KRISHNAMOORTHY RAVISHANKER ,  LEONG FOO LENG ,  SUSANTO EDY

    IPC: H02P6/18

    CPC classification number: H02P6/182 ,  H02P6/187

    Abstract: Systems, methods, and other embodiments associated with back-EMF detection for motor control are described. In an embodiment, an apparatus includes a drive circuit configured to apply excitation signals to respective inputs of a motor, a signal inhibit circuit configured to convey a signal to inhibit application of the excitation signals during an interval, and a measuring circuit configured to measure a back-electromotive force (EMF) signal crossing a reference signal during the interval.

    Abstract translation: 描述了与用于电动机控制的反电动势检测相关联的系统，方法和其它实施例。 在一个实施例中，一种装置包括：驱动电路，被配置为将激励信号施加到电动机的相应输入;信号禁止电路，被配置为传送信号以阻止在间隔期间施加激励信号;以及测量电路， 反电动势（EMF）信号在间隔期间与参考信号交叉。

    BACK-EMF DETECTION FOR MOTOR CONTROL
    4.
    发明申请
    BACK-EMF DETECTION FOR MOTOR CONTROL 审中-公开
    用于电机控制的反电动势检测

    公开(公告)号：WO2012035434A2

    公开(公告)日：2012-03-22

    申请号：PCT/IB2011/002606

    申请日：2011-09-01

    Applicant: MARVELL WORLD TRADE LTD. ,  KRISHNAMOORTHY, Ravishanker ,  LEONG, Foo, Leng ,  SUSANTO, Edy

    Inventor： KRISHNAMOORTHY, Ravishanker ,  LEONG, Foo, Leng ,  SUSANTO, Edy

    CPC classification number: H02P6/182 ,  H02P6/187

    Abstract: Systems, methods, and other embodiments associated with back-EMF detection for motor control are described. In an embodiment, an apparatus includes a drive circuit configured to apply excitation signals to respective inputs of a motor, a signal inhibit circuit configured to convey a signal to inhibit application of the excitation signals during an interval, and a measuring circuit configured to measure a back-electromotive force (EMF) signal crossing a reference signal during the interval.

    Abstract translation: 描述了与用于电动机控制的反电动势检测相关联的系统，方法和其它实施例。 在一个实施例中，一种装置包括：驱动电路，被配置为将激励信号施加到电动机的相应输入;信号禁止电路，被配置为传送信号以阻止在间隔期间施加激励信号;以及测量电路， 反电动势（EMF）信号在间隔期间与参考信号交叉。

    HIGH-VOLTAGE STARTUP CIRCUIT
    6.
    发明申请
    HIGH-VOLTAGE STARTUP CIRCUIT 审中-公开

    公开(公告)号：WO2012158496A4

    公开(公告)日：2012-11-22

    申请号：PCT/US2012/037466

    申请日：2012-05-11

    Applicant: MARVELL WORLD TRADE LTD. ,  KRISHNAMOORTHY, Ravishanker ,  PITIGOI-ARON, Radu ,  CHUI, Siew Yong

    Inventor： KRISHNAMOORTHY, Ravishanker ,  PITIGOI-ARON, Radu ,  CHUI, Siew Yong

    IPC: H02M1/36 ,  H02M7/217

    Abstract: A system including a power transistor configured to receive an alternating current (AC) line voltage and a control circuit. During a rising portion of a half cycle of the AC line voltage, the control circuit is configured to turn on the power transistor when the AC line voltage reaches a first value and turn off the power transistor when the AC line voltage reaches a second value. The second value is greater than the first value. During a falling portion of the half cycle, the control circuit is configured to turn on the power transistor when the AC line voltage reaches the second value and turn off the power transistor when the AC line voltage reaches the first value.

    REDUCING VOLTAGE STRESS IN A FLYBACK CONVERTER DESIGN
    7.
    发明申请
    REDUCING VOLTAGE STRESS IN A FLYBACK CONVERTER DESIGN 审中-公开
    降低变频器设计中的电压应力

    公开(公告)号：WO2012088505A1

    公开(公告)日：2012-06-28

    申请号：PCT/US2011/067169

    申请日：2011-12-23

    Applicant: MARVELL WORLD TRADE LTD ,  ZHANG, Hong Liang ,  DOU, Sen ,  KRISHNAMOORTHY, Ravishanker ,  SHU, Biing Long ,  ZHANG, Wanfeng

    Inventor： ZHANG, Hong Liang ,  DOU, Sen ,  KRISHNAMOORTHY, Ravishanker ,  SHU, Biing Long ,  ZHANG, Wanfeng

    IPC: H02M3/335

    CPC classification number: H02M3/335 ,  H02M1/36

    Abstract: Disclosed is flyback converter having a controller that performs a startup switching process when the flyback converter is powered up, and then performs normal switching afterward. The controller includes a pulse generator to generate a control signal for normal switching. During startup switching, the controller may generate a control signal by output every N th pulse from the pulse generator. In another embodiment, the controller may generate pulses based on a sense signal provided from an input section of the flyback converter.

    Abstract translation: 公开了具有控制器的反激式转换器，该控制器在反激式转换器通电时进行启动切换处理，之后进行正常切换。 该控制器包括脉冲发生器，以产生用于正常切换的控制信号。 在启动切换期间，控制器可以通过从脉冲发生器输出每第N个脉冲来产生控制信号。 在另一个实施例中，控制器可以基于从反激式转换器的输入部分提供的感测信号产生脉冲。

    HIGH-VOLTAGE STARTUP CIRCUIT
    8.
    发明申请
    HIGH-VOLTAGE STARTUP CIRCUIT 审中-公开
    高压启动电路

    公开(公告)号：WO2012158496A3

    公开(公告)日：2013-08-01

    申请号：PCT/US2012037466

    申请日：2012-05-11

    Applicant: MARVELL WORLD TRADE LTD ,  KRISHNAMOORTHY RAVISHANKER ,  PITIGOI-ARON RADU ,  CHUI SIEW YONG

    Inventor： KRISHNAMOORTHY RAVISHANKER ,  PITIGOI-ARON RADU ,  CHUI SIEW YONG

    IPC: H02M1/36 ,  H02M7/217

    CPC classification number: H02M1/36 ,  H02M7/217 ,  H02M7/2176

    Abstract: A system including a power transistor configured to receive an alternating current (AC) line voltage and a control circuit. During a rising portion of a half cycle of the AC line voltage, the control circuit is configured to turn on the power transistor when the AC line voltage reaches a first value and turn off the power transistor when the AC line voltage reaches a second value. The second value is greater than the first value. During a falling portion of the half cycle, the control circuit is configured to turn on the power transistor when the AC line voltage reaches the second value and turn off the power transistor when the AC line voltage reaches the first value.

    Abstract translation: 一种系统，包括被配置为接收交流（AC）线电压的功率晶体管和控制电路。 在AC线电压的半个周期的上升部分期间，控制电路被配置为当AC线电压达到第一值时接通功率晶体管，并且当AC线电压达到第二值时关断功率晶体管。 第二个值大于第一个值。 在半周期的下降部分期间，控制电路被配置为当交流线路电压达到第二值时接通功率晶体管，并且当交流线路电压达到第一值时关断功率晶体管。

    GEOMETRY OF MOS DEVICE WITH LOW ON-RESISTANCE
    10.
    发明申请
    GEOMETRY OF MOS DEVICE WITH LOW ON-RESISTANCE 审中-公开
    具有低电阻性的MOS器件的几何

    公开(公告)号：WO2008083180A3

    公开(公告)日：2008-08-28

    申请号：PCT/US2007088866

    申请日：2007-12-26

    Applicant: MARVELL WORLD TRADE LTD ,  SUTARDJA SEHAT ,  KRISHNAMOORTHY RAVISHANKER

    Inventor： SUTARDJA SEHAT ,  KRISHNAMOORTHY RAVISHANKER

    IPC: H01L27/06

    CPC classification number: H01L27/0207 ,  H01L21/823437 ,  H01L27/088 ,  H01L29/0692 ,  H01L29/0696 ,  H01L29/41725 ,  H01L29/41758 ,  H01L29/4238 ,  H01L29/78 ,  H01L29/7835

    Abstract: A Metal Oxide Semiconductor (MOS) device formed on a substrate and a method for forming the MOS device. The MOS device includes a drain region, a gate region surrounding the drain region, source regions arranged around the gate region and across from the drain region, and bulk regions arranged around the gate region and separating the source regions. The gate region is formed in a loop around the drain region. In this manner, the on-resistance (Ron) of a MOS device is decreased without also increasing the area of the MOS device.

    Abstract translation: 在基板上形成的金属氧化物半导体（MOS）器件和形成MOS器件的方法。 MOS器件包括漏极区域，围绕漏极区域的栅极区域，围绕栅极区域和漏极区域布置的源极区域以及围绕栅极区域布置并分离源极区域的体区域。 栅极区域围绕漏极区域形成环路。 以这种方式，MOS器件的导通电阻（Ron）减小而不增加MOS器件的面积。

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