公开(公告)号：US20240421621A1

公开(公告)日：2024-12-19

申请号：US18672407

申请日：2024-05-23

Applicant: Rolls-Royce Plc

Inventor： Chandana J. GAJANAYAKE ,  Devinda A. Molligoda

IPC: H02J7/00 ,  H01M16/00 ,  H02J7/34

Abstract: An electrical system includes: a battery; a fuel-cell pack; a load; a switching arrangement; and a control system. The switching arrangement selectively configures the electrical system in a battery-isolation mode and at least one of a battery-charge mode and a combined-drive mode. In the battery-isolation mode, the battery is decoupled from the fuel-cell pack and the load, and the fuel-cell pack is coupled to the load for driving of the load by the fuel-cell pack. In the battery-charge mode, the battery is coupled in series to the fuel-cell pack and the load for simultaneous charging of the battery and driving of the load by the fuel-cell pack. In the combined-drive mode, the battery is coupled in series to the fuel-cell pack and the load for driving of the load by both the battery and the fuel-cell pack.

公开(公告)号：US20210143634A1

公开(公告)日：2021-05-13

申请号：US17078842

申请日：2020-10-23

Applicant: Rolls-Royce plc

Inventor： Devinda A. Molligoda ,  Chandana J. Gajanayake ,  Pradip Chatterjee ,  Amit K. Gupta

IPC: H02H9/02 ,  H02M1/36

Abstract: The present disclosure concerns a current limiting circuit for a power converter, which may be used to limit charge and discharge currents for electrical power storage units. In an example embodiment, a current limiting circuit comprises: first and second field effect transistors, each having source, gate and drain connections, wherein the source connection of the first transistor is connected to the gate connection of the second transistor and the source connection of the second transistor is connected to the gate connection of the first transistor; and a resistor connected between the source connections of the first and second transistors, wherein drain connections of the first and second transistors are connectable between a DC electrical power supply and an electrical load for limiting a maximum current flowing between the electrical power supply and the electrical load.

公开(公告)号：US20240417084A1

公开(公告)日：2024-12-19

申请号：US18672375

申请日：2024-05-23

Applicant: ROLLS-ROYCE PLC

Inventor： Chandana J. GAJANAYAKE ,  Devinda A. Molligoda

IPC: B64D27/35 ,  H01M8/04537 ,  H01M8/04858 ,  H01M10/42 ,  H01M16/00 ,  H02J1/08 ,  H02J7/00 ,  H02J7/34

Abstract: An electrical system includes: a battery; a fuel-cell pack; a load electrically coupled to the fuel-cell pack; a switching arrangement electrically coupled to the battery, the fuel-cell pack and the load; a DC-DC converter; and a control system. The switching arrangement configures the electrical system in at least one of a battery-charge mode and a combined-drive mode. In the battery-charge mode the battery is coupled in series to the fuel-cell pack and the load via the DC-DC converter for simultaneous charging of the battery and driving of the load by the fuel-cell pack. In the combined-drive mode, the battery is coupled in series to the fuel-cell pack and the load via the DC-DC converter for driving of the load by both the battery and the fuel-cell pack. The control system is configured to: monitor a parameter of an electrical power provided to the load; and control the DC-DC converter.