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公开(公告)号：US20240280420A1
公开(公告)日：2024-08-22
申请号：US18424999
申请日：2024-01-29
Applicant: ROLLS-ROYCE plc
Inventor： David R. TRAINER , Peter J. COX-SMITH , Jonathan C. NICHOLLS , Mark SWEET
CPC classification number: G01K15/005 , G01K7/00 , G01R15/181
Abstract: An estimation of junction temperatures of transistors in power electronics converter. Example embodiments include method of calibrating electrical power system, electrical power system including: power electronics converter configured to convert between first and second voltage supplies, converter having plurality of semiconductor switches; controller configured to provide switching signals to each semiconductor switch; current sensor arranged to measure current through converter to one of first and second voltage supplies; temperature sensor arranged to measure temperature of one or more semiconductor switches; and junction temperature measurement module configured to receive current signal and temperature signal, method including: controller providing gate switching signal to transistor; junction temperature measurement module measuring threshold voltage of transistor from current signal and temperature of transistor from temperature sensor during switching period of transistor; and junction temperature measurement module updating stored calibration defining relationship between rate of change of current and estimated junction temperature of transistor.
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公开(公告)号：US20240146208A1
公开(公告)日：2024-05-02
申请号：US18488386
申请日：2023-10-17
Applicant: ROLLS-ROYCE plc
Inventor： David R. TRAINER , Mark SWEET , Gian INCERPI , Jonathan M. STEVENS
CPC classification number: H02M5/42 , B64D27/24 , H02M1/32 , B64D2027/026
Abstract: The disclosure relates to an electrical power system with current fault protection provided by current limiting diodes. Example embodiments include an electrical power system comprising: an electrical machine; an AC:DC power electronics converter connected to receive an input AC supply from the electrical machine and provide an output DC supply across first and second output terminals; a DC bus connected to first and second output terminals of the AC:DC power electronics converter; a load connected across the DC bus; a first circuit breaker switch and a first current limiting diode connected in series between the AC:DC power electronics converter and the DC bus; and a second circuit breaker switch and a second current limiting diode connected in series between the DC bus and the load, wherein the first current limiting diode is configured to limit current to a higher level than the second current limiting diode.
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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
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.
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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
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.
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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
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.
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Patent Agency Ranking
公开(公告)号：US20230184130A1
公开(公告)日：2023-06-15
申请号：US17988393
申请日：2022-11-16
Applicant: ROLLS-ROYCE plc
Inventor： Gareth E. MOORE , Paul R. DAVIES , Stephen M. HUSBAND , David R. TRAINER , David P. SCOTHERN , Luke GEORGE , Douglas M M HERBERT
Abstract: Aircraft power and propulsion systems, aircraft comprising such power and propulsion systems, and methods of restarting a gas turbine engine of such power and propulsion systems during flight are provided. One such aircraft power and propulsion system comprises: a propulsive gas turbine engine comprising a plurality of spools, combustion equipment, one or more electric machines mechanically coupled with one or more of the spools and an electrically-powered fuel pump for delivering fuel to the combustion equipment; an electrical system connected with the one or more electric machines and the electrically-powered fuel pump, the electrical system comprising an energy storage system; and a control system configured to: responsive to a determination to the effect that a flame in the combustion equipment has been extinguished, control the electrical system to supply electrical power from the energy storage system to the fuel pump during an engine restart attempt.
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公开(公告)号：US20230182917A1
公开(公告)日：2023-06-15
申请号：US17988371
申请日：2022-11-16
Applicant: ROLLS-ROYCE plc
Inventor： Gareth E. MOORE , Paul R. DAVIES , Stephen M. HUSBAND , David R. TRAINER , David P. SCOTHERN , Luke GEORGE , Douglas M. M. HERBERT
CPC classification number: B64D31/06 , B64D27/24 , B64D27/10 , F01D15/10 , F05D2220/76 , F05D2220/323 , B64D2221/00 , B64D2027/026
Abstract: Multi-engine aircraft power and propulsion systems and methods of starting the engines of multi-engine aircraft disclosed, including supplying electrical power from an electrical power source to electric machines of the a first gas turbine engine and operating electric machines as motors to drive rotation of spools of the first gas turbine engine; starting the first gas turbine engine by lighting combustion equipment of the first gas turbine engine; operating the electric machines of the first gas turbine engine as generators to extract mechanical power and generate electrical power from spools of the first gas turbine engine; transferring the electrical power to electric machines of a second gas turbine engine and operating the electric machines as motors to drive rotation of spools of the second gas turbine engine; and starting the second gas turbine engine by lighting combustion equipment of the second gas turbine engine.
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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
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.
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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
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.
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公开(公告)号：US20240007040A1
公开(公告)日：2024-01-04
申请号：US18333855
申请日：2023-06-13
Applicant: ROLLS-ROYCE plc
Inventor： David R. TRAINER , Ellis F. H. CHONG
Abstract: The disclosure relates to an electrical power system for connecting an electrical machine to first and second DC networks operating at different voltages. Example embodiments include an electrical power system comprising: an electrical machine having first and second pluralities of windings; a first AC:DC power electronics converter connected to the first plurality of windings; a second AC:DC power electronics converter connected to the second plurality of windings; a switching controller configured to provide switching signals to the first and second AC:DC power electronics converters to provide a first DC supply at a DC side of the first AC:DC power electronics converter and a second DC supply at a DC side of the second AC:DC power electronics converter.
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