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    Battery for fault handling in bidirectional power conversion systems
    1.
    发明授权
    Battery for fault handling in bidirectional power conversion systems 有权

    公开(公告)号：US09853455B1

    公开(公告)日：2017-12-26

    申请号：US14986236

    申请日：2015-12-31

    Applicant: X Development LLC

    Inventor： Leo Francis Casey ,  Geoff Dolan

    IPC: H02J1/10 ,  H02J3/46 ,  H02J5/00 ,  H02M7/68

    CPC classification number: H02J5/00 ,  H02M7/219

    Abstract: A power distribution system includes a bidirectional power converter, a battery, and a controller. The bidirectional power converter is operable to (i) convert AC power received at AC terminals to DC power at DC terminals and (ii) convert DC power received at the DC terminals to AC power at the AC terminals. The bidirectional power converter is disposed within a converter stack formed by a plurality of power converters having DC terminals that are coupled to each other in series. The battery is arranged to be selectively couplable to the DC terminals of the bidirectional power converter. The controller is configured to (i) determine that the DC voltage across the DC terminals of the bidirectional power converter is below a threshold voltage and (ii) couple the battery to the DC terminals of the bidirectional power converter based on the determination that the DC voltage is below the threshold voltage.

    Dual-pitch support for a propeller
    2.
    发明授权
    Dual-pitch support for a propeller 有权

    公开(公告)号：US09878775B2

    公开(公告)日：2018-01-30

    申请号：US14143414

    申请日：2013-12-30

    Applicant: X Development LLC

    Inventor： Damon Vander Lind ,  Geoff Dolan

    IPC: B64C11/34 ,  F03D7/02 ,  F03D5/00

    CPC classification number: B64C11/343 ,  F03D5/00 ,  F03D7/0224 ,  F05B2240/917 ,  F05B2240/921 ,  Y02E10/70 ,  Y02E10/723 ,  Y02E10/728

    Abstract: Apparatus are disclosed that are configured to passively rotate a propeller blade from a first pitch angle to a second pitch angle. An example apparatus involves: (a) a rotor hub, (b) at least one dual-pitch support coupled to the rotor hub, wherein the dual-pitch support has a first surface, a second surface and a cavity defined there between, and (c) at least one propeller blade rotatably coupled to the rotor hub such that a blade root is disposed within the dual-pitch support's cavity, where the blade root's front face is positioned against the dual-pitch support's first surface in a first position and the blade root's back face is positioned against the dual-pitch support's second surface in a second position, and the propeller blade is oriented at a first pitch angle in the first position and is oriented at a second pitch angle in the second position.

    Fault tolerance control strategies for multi-kite power generation system
    4.
    发明授权
    Fault tolerance control strategies for multi-kite power generation system 有权

    公开(公告)号：US09948098B1

    公开(公告)日：2018-04-17

    申请号：US14986251

    申请日：2015-12-31

    Applicant: X Development LLC

    Inventor： Leo Francis Casey ,  Geoff Dolan

    IPC: A63H27/04 ,  H02J3/00 ,  H02M7/68

    CPC classification number: H02J5/00 ,  B64D2221/00 ,  H02J7/0027

    Abstract: A power distribution system includes at least a ground power unit, an aerial vehicle, and a power station. The ground power unit is configured to convert an input AC power into DC power output, wherein the ground power unit includes at least a first bus, second bus, and a third bus, wherein the first bus is configured to operate at a first voltage level referenced to the third bus, and wherein the second bus is configured to operate at a second voltage level referenced to the third bus that is different from the first voltage level. The aerial vehicle may include a plurality of motor-generators coupled to a respective plurality of turbines, wherein the plurality of motor-generators may be configured to be energized by power received from a tether. The power station may be electrically coupled to at least the first bus, the second bus, and the tether and configured to: (i) selectively energize the tether using the first bus; and (ii) responsive to detecting a fault by at least one motor-generator of the plurality of motor-generators, selectively energize the tether using the second bus and not the first bus.

    Dual-Pitch Support for a Propeller
    6.
    发明申请
    Dual-Pitch Support for a Propeller 审中-公开

    公开(公告)号：US20170334550A1

    公开(公告)日：2017-11-23

    申请号：US15665386

    申请日：2017-07-31

    Applicant: X Development LLC

    Inventor： Damon Vander Lind ,  Geoff Dolan

    IPC: B64C11/34 ,  F03D5/00 ,  F03D7/02

    CPC classification number: B64C11/343 ,  F03D5/00 ,  F03D7/0224 ,  F05B2240/917 ,  F05B2240/921 ,  Y02E10/70 ,  Y02E10/723 ,  Y02E10/728

    Abstract: Apparatus are disclosed that are configured to passively rotate a propeller blade from a first pitch angle to a second pitch angle. An example apparatus involves: (a) a rotor hub, (b) at least one dual-pitch support coupled to the rotor hub, wherein the dual-pitch support has a first surface, a second surface and a cavity defined there between, and (c) at least one propeller blade rotatably coupled to the rotor hub such that a blade root is disposed within the dual-pitch support's cavity, where the blade root's front face is positioned against the dual-pitch support's first surface in a first position and the blade root's back face is positioned against the dual-pitch support's second surface in a second position, and the propeller blade is oriented at a first pitch angle in the first position and is oriented at a second pitch angle in the second position.

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