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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
申请人： Rolls-Royce plc
摘要： 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：US20230124932A1
公开(公告)日：2023-04-20
申请号：US17950423
申请日：2022-09-22
申请人： ROLLS-ROYCE plc
发明人： Francisco Javier CHIVITE ZABALZA , David R. TRAINER , Mark SWEET , Matthew C. MORRIS , Zafer JARRAH , James A. CAMPBELL
摘要： 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：US20230134788A1
公开(公告)日：2023-05-04
申请号：US17956968
申请日：2022-09-30
申请人： ROLLS-ROYCE plc
摘要： 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.
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公开(公告)号：US20230133771A1
公开(公告)日：2023-05-04
申请号：US17968254
申请日：2022-10-18
申请人： ROLLS-ROYCE plc
摘要： The disclosure relates to electrical converters for use in aircraft electrical power systems and to methods of operating such electrical converters to maintain reliable operation of semiconductor components over varying cosmic radiation levels at altitude. Exemplary embodiments include an electrical converter comprising: a converter circuit having a plurality of semiconductor devices configured to convert an input electrical supply to an output electrical supply; and a controller connected configured to receive an input altitude signal, wherein the controller is further configured to control a temperature of the plurality of semiconductor devices according to the received input altitude signal to reduce an effect of increased incident cosmic radiation on the converter circuit.
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公开(公告)号：US20230137501A1
公开(公告)日：2023-05-04
申请号：US17957273
申请日：2022-09-30
申请人： Rolls-Royce plc
摘要： 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.
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公开(公告)号：US20230123533A1
公开(公告)日：2023-04-20
申请号：US17950445
申请日：2022-09-22
申请人： ROLLS-ROYCE plc
发明人： Francisco Javier CHIVITE ZABALZA , David R TRAINER , Mark SWEET , Matthew C MORRIS , Zafer JARRAH , James A CAMPBELL
IPC分类号： F02C6/00 , H02J3/02 , H02M5/458 , H02M7/219 , H02M1/00 , H02J3/01 , H02J3/00 , B64D27/10 , B64D27/24
摘要： 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.
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