公开(公告)号：US12027940B2

公开(公告)日：2024-07-02

申请号：US17811740

申请日：2022-07-11

Applicant: ROLLS-ROYCE plc

Inventor： David R. Trainer ,  Ellis F H Chong ,  Jonathan M. Stevens

IPC: H02K47/04 ,  H02M3/335 ,  H02M7/219 ,  H02P6/182 ,  H02P101/30

CPC classification number: H02K47/04 ,  H02P6/182 ,  H02M3/33507 ,  H02M7/219 ,  H02P2101/30 ,  H02P2209/07

Abstract: An AC to DC conversion device has first and second AC input terminals arranged to be coupled respectively to first and second terminals of a phase of an AC current generator, an H-bridge rectification device comprising two pairs of diodes, each pair being coupled to a respective one of the AC terminals to produce a DC output comprising a rectified back EMF waveform, and a waveform generator. The waveform generator comprises an output coupled to the DC output of the H-bridge rectification device, and is configured to input a unidirectional waveform to the DC output having the same magnitude and fundamental frequency as the rectified back EMF, phase shifted by a predetermined angle relative to the rectified back EMF waveform.

公开(公告)号：US20230278718A1

公开(公告)日：2023-09-07

申请号：US18165028

申请日：2023-02-06

Applicant: ROLLS-ROYCE plc

Inventor： David R. Trainer ,  Francisco Javier Chivite Zabalza ,  Ellis F H Chong

IPC: B64D31/00 ,  H02M7/217 ,  B64D27/24 ,  B64C29/00 ,  B60L15/02

CPC classification number: B64D31/00 ,  H02M7/217 ,  B64D27/24 ,  B64C29/0033 ,  B60L15/02 ,  B60L2210/40

Abstract: The disclosure relates to an electric aircraft propulsion 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 having input connections connectable to the electric storage unit and output connections connected across the first electric motor, the first converter configured as a DC:AC converter; a second electric motor connected to power a second propulsor; a second converter connected between the first converter input connections and the second electric motor; and a controller configured to control operation of the first and second converters, wherein the second converter is operable as a DC:AC converter to convert the DC supply from the electric storage unit to an AC supply across the second electric motor and as a DC:DC converter to convert the DC supply from the electric storage unit at a first DC level to a DC supply at the input connections of the first converter at a second DC level.

公开(公告)号：US12224673B2

公开(公告)日：2025-02-11

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 ,  B64D27/24 ,  H02M1/00 ,  H02M1/32

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：US12172763B2

公开(公告)日：2024-12-24

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 ,  B64D27/10 ,  H02J1/00 ,  H02M7/219 ,  H02P9/02 ,  B64D27/02

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：US11063527B2

公开(公告)日：2021-07-13

申请号：US16570739

申请日：2019-09-13

Applicant: ROLLS-ROYCE plc

Inventor： David R. Trainer ,  Ellis F H Chong ,  Zhigang Sun

IPC: H02M7/217 ,  H02M7/23 ,  H02M7/25

Abstract: An electrical converter (203) having an active diode-clamped multilevel topology is shown. Each clamping diode is connected in antiparallel with a switch (S5A, S5B). The converter comprises polyphase supply phases (A, B, C) each of which are connected via a respective phase leg (401, 402, 403) to dc rails (301, 302) and a dc-link capacitor. The dc-link capacitor includes a plurality of series-connected capacitors (404, 405). A controller is configured to, in response to an event signal, for each phase leg, activate a combination of switches therein to form a pair of parallel conduction paths to a midpoint (406) between two capacitors in the dc-link capacitor, thereby connecting each phase to the same node.

公开(公告)号：US11873109B2

公开(公告)日：2024-01-16

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 ,  H02J1/10 ,  H02J7/34 ,  H02M3/28

CPC classification number: B64D27/24 ,  H02J1/106 ,  H02J7/34 ,  H02M3/28 ,  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.