公开(公告)号：WO2016179515A1

公开(公告)日：2016-11-10

申请号：PCT/US2016/031254

申请日：2016-05-06

Applicant: APPLE INC.

Inventor： HUSSAIN, Asif ,  MOHTASHEMI, Behzad ,  PANDYA, Manisha, P. ,  NAVABI-SHIRAZI, Mohammad, J.

IPC: H02M3/158 ,  H02M1/08 ,  H02M1/00

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电路工作的电感器和电容器; 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。

公开(公告)号：WO2020068305A1

公开(公告)日：2020-04-02

申请号：PCT/US2019/047408

申请日：2019-08-21

Applicant: APPLE INC.

Inventor： CHEN, Jingdong ,  HUSSAIN, Asif ,  NAVABI-SHIRAZI, Mohammad, J. ,  MOHTASHEMI, Behzad ,  XIE, Yanhui

IPC: H05B33/08 ,  H05B37/03

Abstract: A display may have display layers that form an array of pixels. The array of pixels may be illuminated using a backlight unit. The backlight unit may include multiple strings of light-emitting diodes (LEDs). The multiple LED strings may be controlled by one or more backlight driver integrated circuits (ICs). In a multi-driver IC architecture, an enable signal may be used to set a desired phase delay between the multiple ICs. One or more of the LED strings may exhibit a short fault. Depending on the number of faulty LED strings, the backlight unit can selectively throttle the maximum brightness of the display. The LED strings may receive an output voltage from a DC/DC converter and may be driven using a current driver. The DC/DC converter may be controlled by a headroom feedforward control circuit to ensure sufficient headroom for the current driver while suppressing acoustic noise.