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公开(公告)号：US11412642B2
公开(公告)日：2022-08-09
申请号：US16831886
申请日：2020-03-27
Applicant: ROLLS-ROYCE plc
Inventor： Chandana J. Gajanayake , Vivek Muthu , Pradip Chatterjee , Amit K. Gupta
Abstract: A two-start helical heat exchanger comprises a helical baffle extending along a length of the heat exchanger and having first and second surfaces, wherein: the first surface of the baffle is arranged to provide a first helical fluid flow path for a first fluid; and the second surface of the baffle is arranged to provide a second helical fluid flow path for a second fluid, wherein the second fluid flow path is arranged in counter-flow with the first fluid flow path and a casing within which the baffle is mounted. The baffle is arranged such that first and second fluid flow paths are in thermal contact with each other through the baffle, and in thermal contact with the casing. The heat exchanger may be incorporated into a power converter, for example to cool the power converter. The heat exchanger may be used on an aircraft.
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公开(公告)号：US10716246B2
公开(公告)日：2020-07-14
申请号：US16197775
申请日：2018-11-21
Applicant: ROLLS-ROYCE PLC
Inventor： Vivek Muthu , Chandana J Gajanayake , Pradip Chatterjee
IPC: H05K7/20 , H01L23/473 , H01L23/373 , B64D37/30 , B64D47/00
Abstract: A thermal management device for dissipating heat from one or more electrical components in an aircraft, the thermal management device including: a heat spreader with a plurality of layers of annealed pyrolytic graphite, the heat spreader having higher thermal conductivity in a plane defined by the layers than in a direction perpendicular to the layers; a flow path for a cooling fluid defined through the heat spreader, such that at least a portion of the flow path is surrounded by the heat spreader, wherein the flow path is helical, around a central axis extending through the plurality of layers; and a housing encasing the heat spreader, the housing arranged to have one or more electrical components mounted there-on and to form a thermal interface between the heat spreader and one or more electrical components.
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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
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.
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公开(公告)号：US10971927B2
公开(公告)日：2021-04-06
申请号：US16451455
申请日：2019-06-25
Applicant: ROLLS-ROYCE plc
Inventor： Chandana J Gajanayake , Pradip Chatterjee , Michael A Zagrodnik
Abstract: There is described a device for controlling an amount of current within a power distribution network by manipulating the amount of magnetic flux in the device and thus the impedance experienced by the power distribution network across the device. This is achieved by winding a plurality of coils about a magnetically permeable core and by providing the device with a magnetically permeable bridge element that is movable between a fully-open position at which the net magnetic flux generated in the core by alternating currents in each coil is zero, and a fully-closed position at which a net magnetic flux is present in the core.
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