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

IPC: F02C6/00 ,  H02M5/458 ,  H02M7/219 ,  H02M1/00 ,  H02M1/12 ,  H02J3/02 ,  B64D27/10 ,  B64D27/24

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.

公开(公告)号：US20210004029A1

公开(公告)日：2021-01-07

申请号：US16916841

申请日：2020-06-30

Applicant: ROLLS-ROYCE plc

Inventor： Vladimir A. SHIROKOV ,  Zafer JARRAH

IPC: G05F1/46 ,  H02J1/00 ,  B64D41/00 ,  B63H21/17

Abstract: A method of controlling two or more sources of electrical power to supply electrical power to a shared bus. Each source of electrical power has a rated power Pr, a maximum overload power Pm, and is operable along a multi-voltage droop slope, the multi-voltage droop slope including a share region and a catch region, the share region being defined by an upper voltage limit, Vhigh and a base voltage Vbase, and the catch region being defined by the base voltage Vbase and a lower voltage limit Vlow.

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：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.