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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
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.
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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
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.
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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
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.
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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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Patent Agency Ranking
公开(公告)号：US20240084710A1
公开(公告)日：2024-03-14
申请号：US18204068
申请日：2023-05-31
Applicant: ROLLS-ROYCE plc
Inventor： David R TRAINER , Ellis FH CHONG , Mark SWEET , Gian INCERPI
CPC classification number: F01D15/10 , B64D27/24 , B64D2027/026
Abstract: Reconfigurable permanent magnet electrical machines and aircraft power and propulsion systems including the electrical machines. An aircraft power and propulsion system includes: a gas turbine engine; DC electrical network; permanent magnet electrical machine including a rotor drivingly coupled to a spool of the engine, and a stator including windings controllably switchable between a star and a delta configuration; an AC-DC power electronics converter, an AC side is connected to terminals of the stator windings and a DC side is connected to the DC electrical network; an additional electrical power source connected to and controllable to supply electrical power to the DC electrical network; and a control system configured to control the switching of the stator windings between the configurations and to control the additional electrical power source to supply electrical power to the DC electrical network during a time interval when the stator is being switched between the configurations.
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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
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.
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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：US20240280414A1
公开(公告)日：2024-08-22
申请号：US18425008
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: G01K7/01 , H02M1/327 , F01D21/003 , F05D2220/323 , G01K2217/00
Abstract: The disclosure relates to estimation of junction temperatures of transistors in a power electronics converter. Example embodiments include a method of estimating a junction temperature of a transistor in a power electronics converter configured to convert between first and second supply voltages, the method comprising: providing a gate switching signal to the transistor; measuring a rate of change of current through the converter during a switching period of the transistor; and outputting an estimated junction temperature of the transistor based on the measured rate of change of current, wherein the rate of change of current is measured while a gate voltage of the transistor is above a gate threshold voltage and a drain-source voltage across the transistor is above a predetermined fraction of the first or second supply voltage whereby the rate of change of current is measured in a linear region.
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10.发明公开公开(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
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.
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