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    SYSTEMS AND METHODS OF SYNCHRONOUS RECTIFICATION IN ACTIVE CLAMP FLYBACK POWER CONVERTERS
    1.
    发明申请
    SYSTEMS AND METHODS OF SYNCHRONOUS RECTIFICATION IN ACTIVE CLAMP FLYBACK POWER CONVERTERS 有权

    公开(公告)号：US20210119548A1

    公开(公告)日：2021-04-22

    申请号：US16948417

    申请日：2020-09-17

    Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC

    Inventor： Dhruv CHOPRA ,  Tomas TICHY

    IPC: H02M3/335

    Abstract: Synchronous rectification in active clamp flyback power converters. At least some example embodiments are methods including: sensing a first slope of voltage on a secondary winding of the transformer, the first slope indicative of the power converter entering a charge mode of the transformer; modifying, responsive the sensing, an operational state of a secondary rectifier (SR), driver coupled to a secondary rectifier; making the secondary rectifier conductive by the SR driver during a discharge mode of the transformer; sensing a second slope of voltage on the secondary of the transformer, the second slope indicative of ending of the discharge mode of the power converter; and then returning, responsive to sensing the second slope, the SR driver to an original operational state.

    SWITCHING POWER CONVERTER WITH REDUCED VOLTAGE SWITCHING OF THE PRIMARY SWITCH
    2.
    发明申请
    SWITCHING POWER CONVERTER WITH REDUCED VOLTAGE SWITCHING OF THE PRIMARY SWITCH 有权

    公开(公告)号：US20220109374A1

    公开(公告)日：2022-04-07

    申请号：US17449680

    申请日：2021-10-01

    Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC

    Inventor： Ajay Karthik HARI ,  Dhruv CHOPRA

    IPC: H02M3/335 ,  H02M1/34 ,  H02M1/088

    Abstract: Reduced voltage switching of the primary switch. At least one example is a method comprising: activating, during a first switching period, a primary switch coupled to a primary winding of a transformer of a flyback topology, the activating induces a positive current in the primary winding; deactivating the primary switch and activating a secondary switch coupled to the secondary of the transformer, the activating the secondary switch during the first switching period and for a duration selected based on a signal indicative of negative current from a prior switching period, and the activating the secondary switch results in a positive current through the secondary winding followed by a negative current through the secondary winding; and discharging capacitance of the primary switch by a negative current in the primary winding responsive to the negative current in the secondary winding.

    BOOTSTRAP CLAMP CIRCUIT AND METHOD
    5.
    发明公开
    BOOTSTRAP CLAMP CIRCUIT AND METHOD 审中-公开

    公开(公告)号：US20240097555A1

    公开(公告)日：2024-03-21

    申请号：US17933935

    申请日：2022-09-21

    Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC

    Inventor： Karel PTACEK ,  Dhruv CHOPRA

    IPC: H02M1/088 ,  H02M1/00

    CPC classification number: H02M1/088 ,  H02M1/0006

    Abstract: A driver is suitable for use with a gallium nitride (GaN) power stage, and includes a voltage regulator and a high side driver. The voltage regulator provides a boot voltage between first and second terminals thereof that varies within a range between a turn-on voltage of a GaN transistor, and a safe voltage limit between a gate and a source thereof throughout an active time of said GaN transistor. The high side driver has an input for receiving a high side drive signal, an output for coupling to said gate of said GaN transistor, a power supply terminal coupled to said first terminal of said voltage regulator, and a ground terminal for coupled to said second terminal of said voltage regulator.

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