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    Transformerless AC Line Isolator
    46.
    发明申请
    Transformerless AC Line Isolator 审中-公开
    无变压器交流线路隔离器

    公开(公告)号：US20160329830A1

    公开(公告)日：2016-11-10

    申请号：US15148245

    申请日：2016-05-06

    Applicant: Apple Inc.

    Inventor： Asif Hussain ,  Behzad Mohtashemi ,  Manisha P. Pandya ,  Mohammad J. Navabi-Shirazi

    IPC: H02M7/537 ,  H02M1/08

    CPC classification number: H02M7/537 ,  H02M1/08 ,  H02M3/158 ,  H02M2001/0009 ,  H02M2001/0058 ,  Y02B70/1425 ,  Y02B70/1483 ,  Y02B70/1491

    Abstract: Various systems, apparatuses, and methods are disclosed herein, which provide a new power conversion topology for isolated systems that does not include a transformer. Embodiments of the inventive systems comprise: a switching system utilizing high voltage, low leakage switches, e.g., Silicon Carbide (SiC) MOS-FETs; a power source; an inductor and a capacitor operating as a link stage resonant LC circuit; and a load. The switching system may be configured to be controlled in a synchronized ‘four phase’ control loop process, wherein the input switches are prevented from being closed at the same time as the output switches, thereby providing electrical isolation between the input power source and the load—without the use of a transformer. The techniques disclosed herein are applicable to any number of isolated systems that supply power to electronic systems such as: digital cameras, mobile phones, watches, personal data assistants (PDAs), portable music players, displays, and computers.

    Abstract translation: 本文公开了各种系统，装置和方法，其为不包括变压器的隔离系统提供新的功率转换拓扑。 本发明系统的实施例包括：利用高电压，低泄漏开关（例如碳化硅（SiC））MOS-FET的开关系统; 电源; 作为链路级谐振LC电路的电感器和电容器; 和一个负载。 开关系统可以被配置为被控制在同步的“四相”控制环路过程中，其中防止输入开关与输出开关同时闭合，从而在输入电源和负载之间提供电隔离 - 不使用变压器。 本文公开的技术适用于向诸如数字照相机，移动电话，手表，个人数据助理（PDA），便携式音乐播放器，显示器和计算机之类的电子系统供电的任何数量的隔离系统。

    Display Circuitry with Dynamic Pixel Backlight and Backlight Sloping Control
    47.
    发明申请
    Display Circuitry with Dynamic Pixel Backlight and Backlight Sloping Control 有权
    显示电路与动态像素背光和背光控制

    公开(公告)号：US20140210697A1

    公开(公告)日：2014-07-31

    申请号：US13756259

    申请日：2013-01-31

    Applicant: APPLE INC.

    Inventor： Asif Hussain ,  Jingdong Chen ,  Mohammad Jafar Navabi-Shirazi ,  Manisha Pandya ,  Alejandro L. Ascorra

    IPC: G09G5/10

    CPC classification number: G09G5/10 ,  G09G3/3406 ,  G09G2320/0261 ,  G09G2320/064 ,  G09G2320/0646 ,  G09G2320/10 ,  G09G2330/021 ,  G09G2354/00 ,  G09G2360/144 ,  G09G2360/16

    Abstract: A system may include a processor, a graphics controller, and a display. The graphics controller may generate video data to be presented on the display. The display may include a display panel, a backlight unit for providing the display panel with backlight, and a display timing controller for communicating with the graphics controller. The display may be used in non-movie mode and movie mode. The backlight unit may be operated in fixed backlight mode during the non-movie display mode and may be operated in dynamic pixel backlight (DPB) mode during the movie display mode. Backlight level adjustments may be sloped only during the non-movie mode. Backlight level sloping can be handled internally within the backlight unit, can be controlled using pulse width modulation with the display timing controller, and implemented using incremental backlight level adjustments with the processor.

    Abstract translation: 系统可以包括处理器，图形控制器和显示器。 图形控制器可以生成要呈现在显示器上的视频数据。 显示器可以包括显示面板，用于向显示面板提供背光的背光单元，以及用于与图形控制器通信的显示定时控制器。 显示器可以用于非电影模式和短片模式。 背光单元可以在非电影显示模式期间以固定背光模式操作，并且可以在动画显示模式期间以动态像素背光（DPB）模式操作。 仅在非电影模式期间，背光级别调整可能会倾斜。 背光水平倾斜可以在背光单元内部处理，可以使用显示定时控制器的脉冲宽度调制进行控制，并使用处理器进行增量背光级调整。

    SHORT CIRCUIT PROTECTION
    48.
    发明申请
    SHORT CIRCUIT PROTECTION 有权
    短路保护

    公开(公告)号：US20140139143A1

    公开(公告)日：2014-05-22

    申请号：US13940181

    申请日：2013-07-11

    Applicant: Apple Inc.

    Inventor： Mohammad J. Navabi-Shirazi ,  Asif Hussain ,  Jingdong Chen ,  Manisha P. Pandya

    IPC: H05B33/08

    CPC classification number: H05B33/0887 ,  G06F1/26 ,  H02M3/156 ,  H02M2001/0025 ,  H05B33/0815 ,  H05B33/0884 ,  Y02B20/341

    Abstract: A measured voltage drop across a power-line transistor is used as a sensing element to measure the current and detect an over-current condition for an LED backlight system. An over-current or short condition is detected when the measured voltage drop exceeds a threshold. Accurate detection of the over-current condition is achieved by calibrating the RDS-ON (i.e., internal resistance between drain and source, when transistor is on) of the power-line transistor. In one embodiment, the calibration of RDS-ON is performed by ramping down the threshold from an initial value and using the tripped threshold to determine the actual value for RDS-ON. In another embodiment, the calibration of RDS-ON is performed by using two thresholds, a first threshold to calibrate RDS-ON and a second threshold to detect the over-current condition.

    Abstract translation: 电力线晶体管两端的测量电压降被用作传感元件，以测量电流并检测LED背光系统的过电流状态。 当测量的电压降超过阈值时，检测到过电流或短路状况。 通过校准电源线晶体管的RDS-ON（即，在晶体管导通时漏极和源极之间的内部电阻）来实现过电流状态的精确检测。 在一个实施例中，RDS-ON的校准是通过从初始值降低阈值并使用跳闸阈值来确定RDS-ON的实际值来执行的。 在另一个实施例中，通过使用两个阈值来执行RDS-ON的校准，第二阈值是用于校准RDS-ON的第一阈值和用于检测过电流状态的第二阈值。

    SYSTEMS AND METHODS FOR LIGHT-LOAD EFFICIENCY IN DISPLAYS
    49.
    发明申请
    SYSTEMS AND METHODS FOR LIGHT-LOAD EFFICIENCY IN DISPLAYS 有权
    显示器中轻负载效率的系统和方法

    公开(公告)号：US20140132641A1

    公开(公告)日：2014-05-15

    申请号：US13673695

    申请日：2012-11-09

    Applicant: APPLE INC.

    Inventor： Asif Hussain ,  Jingdong Chen ,  Manisha P. Pandya ,  Mohammad J. Navabi-Shirazi

    IPC: G09G5/10

    CPC classification number: G09G5/10 ,  G09G3/3406 ,  G09G2300/0426 ,  G09G2320/0233

    Abstract: Systems and methods for light-load efficiency in displays may include a backlight driver circuit that may adjust a gate drive voltage provided to a gate of a metal-oxide-semiconductor field-effect transistor (MOSFET) in the boost converter based on the load conditions of light-emitting diodes used to illuminate the display panel. The backlight driver circuit may also switch between two different voltage sources to further broaden a range of gate drive voltages available to drive the gate of the MOSFET in the boost converter. As a result, the backlight driver circuit may decrease gate drive losses associated with the MOSFET, thereby increasing the efficiency of the boost converter.

    Abstract translation: 显示器中轻负载效率的系统和方法可以包括背光驱动器电路，其可以基于负载条件来调节提供给升压转换器中的金属氧化物半导体场效应晶体管（MOSFET）的栅极的栅极驱动电压 的用于照亮显示面板的发光二极管。 背光驱动器电路还可以在两个不同的电压源之间切换，以进一步扩大可用于驱动升压转换器中的MOSFET的栅极的栅极驱动电压的范围。 结果，背光驱动器电路可以减小与MOSFET相关联的栅极驱动损耗，从而提高升压转换器的效率。

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