公开(公告)号：US20230373319A1

公开(公告)日：2023-11-23

申请号：US18139672

申请日：2023-04-26

Applicant: ROLLS-ROYCE plc

Inventor： David R. TRAINER ,  Francisco Javier CHIVITE ZABALZA ,  Mark SWEET ,  Matthew C. MORRIS

IPC: B60L50/00 ,  H02M7/797 ,  H02P27/06 ,  H02M1/32 ,  B64C27/10 ,  B64D27/24

CPC classification number: B60L50/00 ,  H02M7/797 ,  H02P27/06 ,  H02M1/325 ,  B64C27/10 ,  B64D27/24 ,  B64D2027/026

Abstract: A power electronics converter comprising: first and second input terminals; first and second DC output terminals; a branch comprising first and second semiconductor switches connected in series between the first and second DC output terminals, the first input terminal connected to a node between the first and second semiconductor switches; a DC link capacitor connected between the first and second DC output terminals; and a reverse biased DC link diode connected across the DC link capacitor.

公开(公告)号：US20230278721A1

公开(公告)日：2023-09-07

申请号：US18165061

申请日：2023-02-06

Applicant: ROLLS-ROYCE plc

Inventor： David R TRAINER ,  Francisco Javier CHIVITE ZABALZA ,  Ellis F H CHONG

IPC: B64D35/00 ,  B64D27/24 ,  B64C29/00 ,  B60L50/60 ,  H02P5/74

CPC classification number: B64D35/00 ,  B60L50/60 ,  B64C29/0008 ,  B64D27/24 ,  H02P5/74 ,  B60L2200/10 ,  B60L2210/40 ,  B64D2221/00

Abstract: The disclosure relates to an electric aircraft propulsion assembly for an electric vertical takeoff and landing, eVTOL, aircraft, the assembly comprising: an electric storage unit; a first electric motor connected to power a first propulsor; a first converter configured as a DC:AC converter for driving the first electric motor and a second electric motor connected to power a second propulsor, a second converter. A controller is connected to control operation of the first and second converters and is configured to operate in a first mode in which the first and second converters are operated as DC:AC converters to drive the first and second electric motors and a second mode in which the first converter is operated to drive the first electric motor to power the first propulsor and the second converter is operated to drive the second electric motor to provide a braking torque on the second propulsor.

公开(公告)号：US20230159177A1

公开(公告)日：2023-05-25

申请号：US18053015

申请日：2022-11-07

Applicant: ROLLS-ROYCE plc

Inventor： David R. TRAINER ,  Francisco Javier CHIVITE ZABALZA ,  Mark SWEET ,  Luke GEORGE ,  Gian INCERPI

IPC: B64D27/24 ,  H02M3/28 ,  H02J1/10 ,  H02J7/34

CPC classification number: B64D27/24 ,  H02M3/28 ,  H02J1/106 ,  H02J7/34 ,  B64D2221/00 ,  H02J2310/44

Abstract: The disclosure relates to an electrical power system for providing a stabilised DC voltage to a power bus. Example embodiments include an electrical power system comprising: a DC power bus having first and second DC power bus terminals; an electrical storage unit having first and second terminals, the second terminal connected to the second DC power bus terminal; a DC:DC converter having first and second DC:AC converters and a transformer connected between the first and second DC:AC converters, the first DC:AC converter connected between the first terminal of the electrical storage unit and the first DC power bus terminal; and a controller connected to control a switching operation of one or both of the first and second DC:AC converters.

公开(公告)号：US20230136376A1

公开(公告)日：2023-05-04

申请号：US17957778

申请日：2022-09-30

Applicant: Rolls-Royce plc

Inventor： David R. TRAINER ,  Francisco Javier CHIVITE ZABALZA ,  Mark SWEET ,  Gian INCERPI ,  Luke GEORGE

IPC: H02J7/00 ,  H02M3/335 ,  B64D27/24

Abstract: An electrical power system including: an electrical power source, a power electronics converter, an electrical network, a current limiting diode and a controllable circuit interruption device, wherein: the current limiting diode is configured to limit a fault current passing between the electrical power source and the electrical network in a fault condition; and the controllable circuit interruption device is configured to interrupt the fault current in response to a determination that the electrical power system is in the fault condition.

公开(公告)号：US20230421053A1

公开(公告)日：2023-12-28

申请号：US18323884

申请日：2023-05-25

Applicant: ROLLS-ROYCE plc

Inventor： Francisco Javier CHIVITE ZABALZA ,  David R TRAINER ,  Mark SWEET ,  Matthew C MORRIS

IPC: H02M1/32 ,  H02M3/155

CPC classification number: H02M1/32 ,  H02M3/155

Abstract: A power conversion circuitry configured to detect an electrical fault, and methods of detecting an electrical fault in power conversion circuitry, the power conversion circuitry including: switching circuitry configured to control a current flowing along a current path between first and second nodes of the power conversion circuitry; a current sensor connected to the current path, the current sensor configured to measure a rate of change of the current flowing along the current path; and control circuitry connected to the current sensor and the switching circuitry, the control circuitry configured to: detect an electrical fault if a rate of change of the current measured by the current sensor exceeds a fault threshold, and configure the switching circuitry to adjust current flow in the power conversion circuitry when an electrical fault is detected.

公开(公告)号：US20230124932A1

公开(公告)日：2023-04-20

申请号：US17950423

申请日：2022-09-22

Applicant: ROLLS-ROYCE plc

Inventor： Francisco Javier CHIVITE ZABALZA ,  David R. TRAINER ,  Mark SWEET ,  Matthew C. MORRIS ,  Zafer JARRAH ,  James A. CAMPBELL

IPC: F02C6/00 ,  H02M5/458 ,  H02M7/219 ,  H02M1/00 ,  H02M1/12 ,  H02J3/02 ,  B64D27/10 ,  B64D27/24

Abstract: An electrical power system includes: an electrical machine to output AC; DC electrical network; power electronics converter connected between the AC output of the electrical machine and the DC electrical network and having a phase leg having first and second branches respectively having first and second bi-directional MOSFETs; and controller controlling switching of the first and second bi-directional MOSFETs of each phase leg of the converter so that current is commutated between the phase leg first and second branches rectifying the AC input to DC to supply the DC electrical network with DC electrical power. The controller is responsive to a determination to the effect that there is a fault in the DC electrical network, to control the switching of each phase leg first and second bi-directional MOSFETs to switch the converter into a crow-bar configuration in which electrical machine current does not flow to the DC network.

公开(公告)号：US20240002062A1

公开(公告)日：2024-01-04

申请号：US18333873

申请日：2023-06-13

Applicant: ROLLS-ROYCE plc

Inventor： David R. TRAINER ,  Francisco Javier CHIVITE ZABALZA ,  Mark SWEET ,  Gian INCERPI

IPC: B64D27/24 ,  H02M7/219 ,  H02P9/02 ,  H02J1/00 ,  B64D27/10

CPC classification number: B64D27/24 ,  H02M7/219 ,  H02P9/02 ,  H02J1/00 ,  B64D27/10 ,  B64D2027/026

Abstract: The disclosure relates to an electrical power system for connecting an electrical machine to first and second DC networks operating at different voltages. In an embodiment, an electrical power system comprises: an electrical machine having first, second, third and fourth windings; first, second, third and fourth AC:DC power electronics converters each connected to receive an input AC supply from the respective first, second, third and fourth windings, each AC:DC power electronics converter having first and second DC output terminals connecting the AC:DC power electronics converters to first, second and third DC supply output terminals, wherein the first and second windings are arranged to provide an AC supply to the respective first and second AC:DC power electronics converters in quadrature to each other and the third and fourth windings are arranged to provide an AC supply to the respective third and fourth AC:DC power electronics converters in quadrature to each other.

公开(公告)号：US20230134788A1

公开(公告)日：2023-05-04

申请号：US17956968

申请日：2022-09-30

Applicant: ROLLS-ROYCE plc

Inventor： David R. TRAINER ,  Francisco Javier CHIVITE ZABALZA ,  Mark SWEET ,  Luke GEORGE

IPC: H02M3/335 ,  H02M1/00 ,  H02M1/32 ,  B64D27/24

Abstract: There is provided an electrical power system comprising: a DC voltage source, a DC electrical network, a DC to AC to DC converter having a primary side connected to the DC voltage source and a secondary side connected to the DC electrical network, and a controller configured to control the DC to AC to DC converter, wherein the controller is configured to: monitor an electrical current or voltage between the DC voltage source and the DC electrical network; determine, based on the monitored electrical current or voltage, whether the DC electrical network is in a fault condition; and increase a switching frequency of the primary side of the DC to AC to DC converter in response to a positive determination that the DC electrical network is in a fault condition.

公开(公告)号：US20230133771A1

公开(公告)日：2023-05-04

申请号：US17968254

申请日：2022-10-18

Applicant: ROLLS-ROYCE plc

Inventor： David R. TRAINER ,  Francisco Javier CHIVITE ZABALZA ,  Mark SWEET

IPC: B60L15/00 ,  H02M3/158 ,  H02M5/458

Abstract: The disclosure relates to electrical converters for use in aircraft electrical power systems and to methods of operating such electrical converters to maintain reliable operation of semiconductor components over varying cosmic radiation levels at altitude. Exemplary embodiments include an electrical converter comprising: a converter circuit having a plurality of semiconductor devices configured to convert an input electrical supply to an output electrical supply; and a controller connected configured to receive an input altitude signal, wherein the controller is further configured to control a temperature of the plurality of semiconductor devices according to the received input altitude signal to reduce an effect of increased incident cosmic radiation on the converter circuit.

公开(公告)号：US20230421054A1

公开(公告)日：2023-12-28

申请号：US18323878

申请日：2023-05-25

Applicant: ROLLS-ROYCE plc

Inventor： Francisco Javier CHIVITE ZABALZA ,  David R TRAINER ,  Mark SWEET ,  Matthew C MORRIS ,  Zafer JARRAH

IPC: H02M1/32 ,  H02M7/219 ,  H02M1/00

CPC classification number: H02M1/325 ,  H02M7/219 ,  H02M1/0009

Abstract: A power conversion circuitry configured to transition between modes of operation during an electrical fault, including: switching circuitry configured to control currents flowing along a plurality of current paths between respective pairs of nodes, wherein the paths include first and second transistor-diode pairs; and control circuitry connected to the switching circuitry configured to: configure the switching circuitry to transition, when an electrical fault is detected, to a first mode of operation by configuring the transistors to switch to a non-conducting state so currents flow through the diodes, determine when current begins to flow through a diode, and configure the switching circuitry to transition from the first mode to a fault mode of operation by configuring the transistors to sequentially switch to a conducting state so currents flow through the configured transistors. Also, a method of controlling power conversion circuitry to transition between modes of operation during an electrical fault.