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：US20250125736A1

公开(公告)日：2025-04-17

申请号：US18895743

申请日：2024-09-25

Applicant: ROLLS-ROYCE PLC

Inventor： David R TRAINER ,  Mark SWEET ,  Cezary P MAKULEC

IPC: H02M3/335 ,  B64D47/00 ,  H02J1/08 ,  H02M1/32 ,  H02M3/00

Abstract: A DC:DC converter includes: a DC:AC converter circuit having DC and AC sides; an AC:DC converter circuit having DC and sides; an AC link connecting the AC side of the DC:AC circuit and the AC side of the AC:DC converter circuit, the AC link including a transformer having a first winding connected to the AC side of the DC:AC converter circuit and a second winding connected to the AC side of the AC:DC converter; a capacitor; and a switch arrangement having a first state and a second state, wherein: in the first state, the capacitor is connected in series between the AC side of the DC:AC converter circuit and the first winding of the transformer; and in the second state, there is a current path between the AC side of the DC:AC converter circuit and the first winding of the transformer that does not include the capacitor.

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：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

IPC: G01K7/01 ,  H02M1/32 ,  F01D21/00

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.

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.

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：US20250125608A1

公开(公告)日：2025-04-17

申请号：US18895786

申请日：2024-09-25

Applicant: ROLLS-ROYCE PLC

Inventor： David R. TRAINER ,  Mark SWEET ,  Cezary P. MAKULEC ,  Pablo A. BRIFF ,  John E. MAPPERSON

IPC: H02H7/12 ,  H02M3/335

Abstract: A DC:DC power electronics converter in an electrical power system includes: DC:AC and AC:DC converters; and an AC link connecting AC sides of the converters, the AC link including a transformer having first and second windings connected respectively to AC sides of the converters; a DC power source connected to the DC side of the DC:AC converter; a DC electrical network connected to the DC side of the AC:DC converter; and a control system to: control a switching operation of respective first and second pluralities of transistors of the converters, monitor one or more operating parameters of the electrical power system and determine whether there is a fault in the electrical network, and if so, modify a switching operation of the first and/or second plurality of transistors to supply a controlled amount of fault current from the DC power source to the electrical network via the DC:DC power electronics converter.