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    System and method for controlling resonant wireless power source
    15.
    发明授权
    System and method for controlling resonant wireless power source 有权

    公开(公告)号：US09722462B2

    公开(公告)日：2017-08-01

    申请号：US13956377

    申请日：2013-08-01

    Applicant: MediaTek Singapore Pte. Ltd.

    Inventor： Anand Satyamoorthy ,  Hasnain Akram ,  Patrick Stanley Riehl

    IPC: H02J50/12 ,  H01F38/14 ,  H02J5/00 ,  H02J17/00

    CPC classification number: H02J50/12 ,  H01F38/14 ,  H02J5/005 ,  H02J7/025 ,  H02J17/00 ,  H02J50/40 ,  H02J50/80

    Abstract: A resonant wireless power system includes a source circuit having a source coil, an ac driver with a first resistance, representing the equivalent output impedance of the ac driver, and a matching network. A current probe measures the magnitude signal of the instantaneous source coil current. A voltage probe measures the instantaneous ac driver voltage. A phase detector compares the phase of the instantaneous source coil current and the instantaneous ac driver voltage, and produces a first output signal proportional to the phase difference. A first amplifier compares the magnitude signal and a target signal, and produces an error signal proportional to the difference. A first compensation filter produces the control voltage that determines the ac driver supply voltage. A second amplifier amplifies the first output signal. A second compensation filter produces the control voltage that determines the impedance of a variable element in the source circuit.

    WIRELESS CHARGER COMMUNICATION AUTOMATIC GAIN CONTROL
    16.
    发明申请
    WIRELESS CHARGER COMMUNICATION AUTOMATIC GAIN CONTROL 有权
    无线充电器通信自动增益控制

    公开(公告)号：US20150093989A1

    公开(公告)日：2015-04-02

    申请号：US14505494

    申请日：2014-10-02

    Applicant: MediaTek Singapore Pte. Ltd.

    Inventor： William Plumb ,  Anand Satyamoorthy ,  Patrick Stanley Riehl

    IPC: H04B5/00 ,  H04B1/04 ,  H04B1/16

    CPC classification number: H04B5/0037 ,  H02J5/005 ,  H02J7/025 ,  H02J50/10 ,  H02J50/12 ,  H02J50/40 ,  H02J50/80 ,  H04B5/0031 ,  H04B2001/0416

    Abstract: A variable gain circuit used in an in-band communication system is provided that includes a current sense pickup that is coupled to the output of a DC power source that senses current from the DC power source and provides a first output signal. A variable controlled amplifier structure, that is coupled to the DC power source, receives the first output signal and provides a specified amount of gain to the first output signal so as to produce a second output signal. A digital signal is produced using the second output having a selected frequency bandwidth.

    Abstract translation: 提供了一种在带内通信系统中使用的可变增益电路，其包括耦合到直流电源的输出的电流感测拾取器，该直流电源感测来自直流电源的电流并提供第一输出信号。 耦合到DC电源的可变控制放大器结构接收第一输出信号并且向第一输出信号提供指定量的增益以产生第二输出信号。 使用具有所选频率带宽的第二输出产生数字信号。

    WIRELESS CHARGER SYSTEM THAT HAS VARIABLE POWER / ADAPTIVE LOAD MODULATION
    17.
    发明申请
    WIRELESS CHARGER SYSTEM THAT HAS VARIABLE POWER / ADAPTIVE LOAD MODULATION 审中-公开
    无线充电系统，具有可变功率/自适应负载调制

    公开(公告)号：US20150091523A1

    公开(公告)日：2015-04-02

    申请号：US14503326

    申请日：2014-09-30

    Applicant: MediaTek Singapore Pte. Ltd.

    Inventor： Anand Satyamoorthy ,  Patrick Stanley Riehl ,  William Plumb

    IPC: H02J7/02 ,  H02J7/00

    CPC classification number: H02J50/10 ,  H02J7/025 ,  H04B5/0037 ,  H04B5/0093

    Abstract: A wireless charging system that includes in-band communication includes: a source device, including: at least a transmitter coil for providing a wireless charging power which is modulated according to a reflected impedance of at least a target device; and at least the target device, oriented on and magnetically coupled to the source device, for receiving the charging power. The target device includes: a receiver coil, loosely coupled to the transmitter coil, for receiving the charging power; a variable resistor loading the receiver coil; and a power detection and modulation circuit, for determining a size of the charging power, and providing a modulation control signal to the variable resistor according to the size of the charging power, for varying the resistance of the variable resistor in order to control an impedance of the target device which will be reflected at the source device.

    Abstract translation: 包括带内通信的无线充电系统包括：源设备，包括：至少一个发射器线圈，用于提供根据至少目标设备的反射阻抗被调制的无线充电功率; 以及至少目标设备，其定向和磁耦合到源设备，用于接收充电功率。 目标装置包括：松耦合到发射器线圈的接收器线圈，用于接收充电功率; 负载接收线圈的可变电阻器; 以及功率检测和调制电路，用于确定充电功率的大小，以及根据充电功率的大小向可变电阻器提供调制控制信号，用于改变可变电阻器的电阻以控制阻抗 将在源设备上反映的目标设备。

    WIRELESS POWER TRANSFER IN-BAND COMMUNICATION SYSTEM
    18.
    发明申请
    WIRELESS POWER TRANSFER IN-BAND COMMUNICATION SYSTEM 有权
    无线电力传输带内通信系统

    公开(公告)号：US20140314170A1

    公开(公告)日：2014-10-23

    申请号：US14356607

    申请日：2013-10-25

    Applicant: William Plumb ,  Zhen Wang ,  Zoran Zvonar ,  Patrick Stanley Riehl ,  Anand Satyamoorthy ,  Philip Frank Tustin ,  MediaTek Singapore Pte, Ltd.

    Inventor： William Plumb ,  Zhen Wang ,  Zoran Zvonar ,  Patrick Stanley Riehl ,  Anand Satyamoorthy ,  Philip Frank Tustin

    IPC: H04L1/00 ,  H04L25/49

    CPC classification number: H02J50/12 ,  H02J7/025 ,  H02J50/10 ,  H02J50/60 ,  H02J50/80 ,  H04B5/0037 ,  H04B5/0093 ,  H04L1/0045 ,  H04L1/0061 ,  H04L25/4904 ,  H04W52/0261

    Abstract: A wireless charging in-band communication system includes a transmitter module that formats a message using CRC calculation and attaches the results of the CRC calculation to the message for message error detection. The transmitter includes channel encoding for message error correction. A modulation module performs biphase modulation for DC balanced signals and impedance switching to change reflected impedance seen by the source. A synchronization module prepending the message with a synchronization sequence having Golay complementary codes. Moreover, the in-band communication includes a receiver module that receives the message from the transmitter module. The receiver module includes an impedance sensing circuit to detect changes in the reflected impedance of the transmitter module. The receiver module includes a front end filter used for pulse shaping and noise rejection. A preamble detection block includes a Golay complementary code correlator used for message detection, synchronization, and equalization coefficient estimation and selection. A decoding module performs biphase demodulation with error correction with a DC offset being estimated as the average value of the signal over the length of the message before channel decoding Also, the decoding module performs equalization, error correction channel decoding,and error detection (CRC).

    Abstract translation: 无线充电带内通信系统包括发射机模块，其使用CRC计算格式化消息，并将CRC计算的结果附加到用于消息错误检测的消息。 发射机包括消息纠错的信道编码。 调制模块对直流平衡信号进行双相调制，并进行阻抗切换，以改变源所见的反射阻抗。 一个同步模块，前置消息具有一个具有Golay补码的同步序列。 此外，带内通信包括从发射机模块接收消息的接收机模块。 接收器模块包括用于检测发射器模块的反射阻抗的变化的阻抗感测电路。 接收器模块包括用于脉冲整形和噪声抑制的前端滤波器。 前导码检测块包括用于消息检测，同步和均衡系数估计和选择的Golay互补码相关器。 解码模块执行纠错的双相解调，其中DC偏移被估计为在信道解码之前的消息的长度上的信号的平均值。另外，解码模块执行均衡，纠错信道解码和错误检测（CRC） 。

    Wireless power receiver with programmable power path
    20.
    发明授权
    Wireless power receiver with programmable power path 有权

    公开(公告)号：US09954400B2

    公开(公告)日：2018-04-24

    申请号：US15037051

    申请日：2015-01-08

    Applicant: MediaTek Singapore Pte. Ltd.

    Inventor： Hasnain Akram ,  Yung-Chih Yen ,  Patrick Stanley Riehl ,  Anand Satyamoorthy

    IPC: H02M3/156 ,  H02J50/12 ,  H02J5/00 ,  H02J7/02 ,  H01F38/14 ,  G05F1/575 ,  H02M3/07 ,  H02M7/217 ,  H04B5/00 ,  H02M1/00 ,  H02M7/219 ,  G05F1/56

    Abstract: A synchronous rectifier using only n-channel devices in which the low-side switches are effectively cross-coupled using low-side comparators and the high-side switches perform an accurate zero-voltage-switching (ZVS) comparison. The charging path of each bootstrap domain is completed through the low-side switches, which are each always on for every half-cycle independent of loading. This scheme gives rectifier efficiency gain because a) each bootstrap domain receives maximum charging time, and b) the charging occurs through a switch rather than a diode. Both these factors ensure the bootstrap domain is fully charged, thereby reducing conduction losses through the rectifier switches. Furthermore, settings may be adjusted by software to optimize the resistive and capacitive losses of the rectifier. Using data for die temperature and operating frequency, software can create a feedback loop, dynamically adjusting rectifier settings in order to achieve the best possible efficiency.

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