公开(公告)号：US20230140274A1

公开(公告)日：2023-05-04

申请号：US17956924

申请日：2022-09-30

Applicant: ROLLS-ROYCE plc

Inventor： David R TRAINER ,  Mark SWEET

IPC: H02H9/02 ,  H01L35/10 ,  H01L35/32

Abstract: There is provided a current limiting diode 200 comprising a gate 206, a source 202, a drain 204 electrically connected to the source by an n-channel or p-channel 220 and a thermoelectric generator 208; wherein the source and the gate are electrically connected by a fill structure 210, and wherein the thermoelectric generator is configured to: generate a thermoelectric voltage by absorbing heat from the n-channel or p-channel and rejecting heat to a heat sink in a current limiting condition; and apply the thermoelectric voltage between the gate and the source.

公开(公告)号：US20230137501A1

公开(公告)日：2023-05-04

申请号：US17957273

申请日：2022-09-30

Applicant: Rolls-Royce plc

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

IPC: H02H9/02 ,  G05F3/24

Abstract: There is provided a current limiting diode comprising a gate, a source, and a drain electrically connected to the source by an n-channel or p-channel; wherein the source and the gate are electrically connected by a fill structure comprising a phase-change fill material, and wherein the phase-change fill material is configured to absorb heat from the n-channel or p-channel by changing phase.

公开(公告)号：US20230123533A1

公开(公告)日：2023-04-20

申请号：US17950445

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 ,  H02J3/02 ,  H02M5/458 ,  H02M7/219 ,  H02M1/00 ,  H02J3/01 ,  H02J3/00 ,  B64D27/10 ,  B64D27/24

Abstract: A electrical power system comprises: an electrical machine operable to output AC; a DC electrical network; a power electronics converter connected between the AC output of the electrical machine and the DC electrical network and including a plurality of transistors and associated diodes connected in parallel with the transistors; and a controller configured to control switching of the transistors of the converter so that, during normal operation of the electrical power system, the converter rectifies the AC output of the electrical machine to supply the DC electrical network with DC electrical power. The controller is further configured, responsive to a determination to the effect there is a fault in the DC electrical network, to control a voltage source, to inject a voltage to bias the diodes of the converter, and to control the switching of the transistors to control a level of current supplied to the faulted DC electrical network.

公开(公告)号：US20240413763A1

公开(公告)日：2024-12-12

申请号：US18660436

申请日：2024-05-10

Applicant: ROLLS-ROYCE plc

Inventor： David R. TRAINER ,  Mark SWEET

IPC: H02M7/217 ,  H02M1/32

Abstract: The disclosure relates to power electronics converters having circuit breaker protection for use in case of faults. Example embodiments include a power electronics converter for converting an input AC supply having a plurality of phases to an output DC supply, the converter comprising: a plurality of AC input terminals connectable to the plurality of phases of the AC supply; first and second DC output terminals; a capacitor connected between the first and second DC output terminals; a first MOSFET connected between each of the plurality of AC input terminals and the first DC output terminal; a second MOSFET connected between each of the plurality of AC input terminals and the second DC output terminal; and a third MOSFET reverse connected in series with the first MOSFET between the first DC output terminal and each of the plurality of AC input terminals.

公开(公告)号：US20240204594A1

公开(公告)日：2024-06-20

申请号：US18204112

申请日：2023-05-31

Applicant: ROLLS-ROYCE plc

Inventor： David R TRAINER ,  Ellis FH CHONG ,  Mark SWEET ,  Gian INCERPI

IPC: H02K1/27 ,  B64D27/10 ,  H02K3/28 ,  H02K7/18 ,  H02K11/33

CPC classification number: H02K1/27 ,  B64D27/10 ,  H02K3/28 ,  H02K7/1823 ,  H02K11/33 ,  B64D2221/00

Abstract: Reconfigurable permanent magnet electrical machines and aircraft power and propulsion systems comprising such electrical machines are described. In one aspect, an aircraft power and propulsion system comprises: a gas turbine engine; a permanent magnet electrical machine comprising a rotor drivingly coupled to a spool of the gas turbine engine, and a stator comprising windings controllably switchable between a star configuration and a delta configuration; a DC electrical network; an AC:DC power electronics converter, an AC side of which is connected to terminals of the stator windings of the electrical machine and a DC side of which is connected to the DC electrical network; and a control system. The control system is configured to monitor at least one operating condition of the power and propulsion system and to control the switching of the stator windings between the star configuration and the delta configuration based on the at least one operating condition.

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：US20210126567A1

公开(公告)日：2021-04-29

申请号：US17061140

申请日：2020-10-01

Applicant: ROLLS-ROYCE plc

Inventor： Mark SWEET ,  David F BROOKES

IPC: H02P9/42 ,  F02C7/06 ,  F02C6/00 ,  H02P101/25 ,  H02P103/20

Abstract: A turboelectric generator system includes a gas turbine engine which includes, in fluid flow series, a gas-generator compressor, a combustor, a gas-generator turbine, and a variable-speed free power turbine. The system further comprises a variable-frequency electric machine rotatably connected with the free power turbine and a power converter configured to convert a variable frequency electrical output from the electric machine to a fixed frequency output.