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    SELF BIASED RECTIFIER CIRCUIT
    1.
    发明申请
    SELF BIASED RECTIFIER CIRCUIT 有权

    公开(公告)号：US20210391804A1

    公开(公告)日：2021-12-16

    申请号：US17282311

    申请日：2019-10-01

    Applicant: KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY

    Inventor： Khaled Nabil SALAMA ,  Abdullah Saud ALMANSOURI

    IPC: H02M7/217 ,  H02M1/08

    Abstract: A self-biased rectifier circuit includes first and second input terminals and first and second output terminals. The self-biased rectifier circuit also includes a rectifier having first, second, third, and fourth transistors, each having a source, gate, and drain. The sources of the first and second transistors and the gates of the third and fourth transistors are coupled to the first input terminal. The sources of the third and fourth transistors and the gates of the first and second transistors are coupled to the second input terminal. The drains of the first and third transistors are coupled to the second output terminal. The drains of the second and fourth transistors are coupled to the first output terminal. A feedback circuit includes a plurality of transistors configured as at least one rectifier. The feedback circuit is coupled to the gates of the first and third transistors and the plurality of transistors are configured to provide a first biasing voltage or a second biasing voltage to the gates of the first and third transistors depending upon a magnitude of power or voltage applied to the first and second input terminals. Additionally, or alternatively, the feedback circuit is coupled to the gates of the second and fourth transistors and the plurality of transistors are configured to provide a first biasing voltage or a second biasing voltage to the gates of the second and fourth transistors depending upon a magnitude of power or voltage applied to the first and second input terminals.

    LOW POWER WATER CUT SENSING
    3.
    发明申请
    LOW POWER WATER CUT SENSING 有权

    公开(公告)号：US20210054739A1

    公开(公告)日：2021-02-25

    申请号：US17043177

    申请日：2019-04-04

    Applicant: KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY

    Inventor： Jürgen KOSEL ,  Altynay KAIDAROVA ,  Abdullah Saud ALMANSOURI ,  Mohammed Asadullah KHAN ,  Liam SWANEPOEL

    IPC: E21B49/08 ,  G01N29/032 ,  G01N29/036 ,  G01N27/02

    Abstract: A system for determining a water cut of a water/oil emulsion includes a water cut sensor with a magnetoelastic ribbon, an inductive coil arranged proximate to the magnetoelastic ribbon so that an electromagnetic field produced by the inductive coil electromagnetically excites the magnetoelastic ribbon, and an alternating current source. A processor is configured to determine the water cut of the water/oil emulsion based on a resonant frequency of the magnetoelastic ribbon while the magnetoelastic ribbon is excited by the inductive coil. A feed line is coupled to the water cut sensor. The feed line includes an electrical coupling between the alternating current source and the inductive coil of the water cut sensor. The feedline includes an electrical coupling between the processor and the inductive coil of the water cut sensor or the processor is coupled to an acoustic sensor.

    MECHANICAL FREQUENCY UPCONVERTER
    6.
    发明申请
    MECHANICAL FREQUENCY UPCONVERTER 有权

    公开(公告)号：US20210144464A1

    公开(公告)日：2021-05-13

    申请号：US17043180

    申请日：2019-04-04

    Applicant: KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY

    Inventor： Jürgen KOSEL ,  Abdullah Saud ALMANSOURI

    IPC: H04R1/24 ,  H03D7/16 ,  H04R1/28

    Abstract: A mechanical frequency upconverter includes a body having a cavity. A low-frequency membrane is coupled to the body and arranged adjacent to the cavity. The low-frequency membrane is a permanent magnet or a permanent magnet is affixed to the low-frequency membrane. A high-frequency membrane is coupled to the body and arranged adjacent to the cavity. The high-frequency membrane includes a magnetic metal. Oscillation of the low-frequency membrane at a first frequency causes the high-frequency membrane to oscillate at a second frequency, which is higher than the first frequency.

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