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    Display backlight driver IC configuration
    3.
    发明授权
    Display backlight driver IC configuration 有权
    显示背光驱动IC配置

    公开(公告)号：US08933643B2

    公开(公告)日：2015-01-13

    申请号：US13659888

    申请日：2012-10-24

    Applicant: Apple Inc.

    Inventor： Alejandro Lara Ascorra ,  Shimon Elkayam ,  Asif Hussain ,  Brad Lee Patton ,  Steven J. Sfarzo ,  Eric G. Smith

    IPC: H05B37/02

    CPC classification number: H05B33/0842

    Abstract: One embodiment of a display backlight driver integrated circuit can be configured for operation in at least two different ways. A first method transfers data from an EEPROM to hardware registers prior to regular operation. A second method also transfers data from an EEPROM to registers. However, hardware registers can be overwritten with data accepted from a control bus, prior to regular operation. A keyboard driver IC can detect the presence or absence of a cable to an LED. If the cable is absent, the driver IC will not supply power for the LED. One embodiment of a keyboard and display backlight control system can be configured to allow substantially independent operation.

    Abstract translation: 显示器背光驱动器集成电路的一个实施例可被配置为以至少两种不同的方式进行操作。 第一种方法是在正常操作之前将数据从EEPROM传输到硬件寄存器。 第二种方法还将数据从EEPROM传输到寄存器。 但是，在正常操作之前，硬件寄存器可以被从控制总线接受的数据覆盖。 键盘驱动器IC可以检测到LED的电缆的存在或不存在。 如果电缆不存在，驱动器IC将不会为LED供电。 键盘和显示器背光控制系统的一个实施例可以被配置为允许基本独立的操作。

    Electromagnetic shielding for wireless power transfer systems
    6.
    发明授权
    Electromagnetic shielding for wireless power transfer systems 有权

    公开(公告)号：US10910862B2

    公开(公告)日：2021-02-02

    申请号：US15701224

    申请日：2017-09-11

    Applicant: Apple Inc.

    Inventor： Shimon Elkayam ,  Brandon R. Garbus ,  Christopher S. Graham ,  Karl Ruben F. Larsson

    IPC: H02J7/00 ,  H02J7/02 ,  H02J50/40 ,  H02J50/70 ,  H02J50/10 ,  H01F38/14

    Abstract: Embodiments describe electromagnetic shielding for wireless charging systems. A wireless charging system includes a transmitter coil configured to generate a magnetic flux, a receiver coil positioned coaxial with the transmitter coil to receive the generated magnetic flux, where electrical interaction between the transmitter coil and the receiver coil generates electric fields, a transmitter shield positioned between the transmitter coil and the receiver coil to intercept some of the electric fields directed away from the transmitter coil and allow the magnetic flux to pass through the transmitter shield, and a receiver shield positioned between the transmitter shield and the receiver coil to intercept some of the electric fields directed away from the receiver coil and allow the magnetic flux to pass through the receiver shield.

    Power supply with continuous spread-spectrum switching signal
    7.
    发明授权
    Power supply with continuous spread-spectrum switching signal 有权
    电源具有连续扩频切换信号

    公开(公告)号：US09350232B2

    公开(公告)日：2016-05-24

    申请号：US13854805

    申请日：2013-04-01

    Applicant: Apple Inc.

    Inventor： Yongxuan Hu ,  Keong W. Kam ,  Shimon Elkayam ,  Susan R. Schen

    IPC: H02M3/338 ,  H02M1/44 ,  H02M3/158 ,  H02M3/335

    CPC classification number: H02M1/44 ,  H02M3/158 ,  H02M3/33507

    Abstract: A switched-mode power supply with reduced electromagnetic interference (EMI) is described. This switched-mode power supply includes a modulation circuit that continuously frequency modulates a control signal over a bandwidth associated with a spread-spectrum modulation signal. By frequency modulating the control signal in the switched-mode power supply, spectral content associated with a modulated switching signal is spread evenly over the bandwidth, thereby reducing the EMI.

    Abstract translation: 描述了具有降低的电磁干扰（EMI）的开关式电源。 该开关式电源包括在与扩频调制信号相关的带宽上连续地对控制信号进行频率调制的调制电路。 通过对开关电源中的控制信号进行频率调制，与调制的开关信号相关联的频谱内容在带宽上均匀分布，从而降低EMI。

    Asymmetric duty control of a half bridge power converter
    10.
    发明授权
    Asymmetric duty control of a half bridge power converter 有权

    公开(公告)号：US10601250B1

    公开(公告)日：2020-03-24

    申请号：US15476472

    申请日：2017-03-31

    Applicant: Apple Inc.

    Inventor： InHwan Oh ,  Shimon Elkayam ,  Manisha P. Pandya

    IPC: H02J50/00 ,  H02J50/05 ,  H02J50/12 ,  H02J7/02 ,  H02J50/40 ,  H02J50/80

    Abstract: A half bridge power converter can be coupled to, or included in, a wireless transmitter device. The half bridge power converter includes an upper switching element connected between a direct current supply voltage and a lower switching element. A duty controller is coupled to the upper and the lower switching elements and is configured to asymmetrically control the duty cycles of the upper and lower switching elements based on a voltage level of the direct current supply voltage. In general, the duty cycle of the lower switching element is different than the duty cycle of the upper switching element. Additionally or alternatively, the duty controller is configured to determine and control the duty cycles of the upper and lower switching elements to adjust a direct current gain of a wireless energy transfer system that includes the wireless transmitter device.

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