Power supply unit for use with an aircraft electrical system
First Claim
Patent Images
1. A power supply unit for use with an aircraft power bus, comprising:
- a connection circuit being electrically coupled to the aircraft power bus and providing the power supply unit with both charge and discharge paths;
an energy storage circuit being electrically coupled to the connection circuit, wherein during charging periods the energy storage circuit receives charge from the aircraft power bus through the charge path, and during discharging periods the energy storage circuit provides charge to the aircraft power bus through the discharge path;
a comparator circuit that is electrically coupled to the energy storage circuit and that determines if there is adequate voltage on the aircraft power bus; and
a time delay circuit that is electrically coupled to the comparator circuit and that, in response to a determination by the comparator circuit that there is inadequate voltage on the aircraft power bus, distinguishes when a loss of power on the aircraft power bus is due to a temporary disruption and when it is due to a desired shut down.
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Accused Products
Abstract
A power supply unit that provides uninterrupted power to an aircraft power bus during switchovers of the aircraft bus from one power source to another. The power supply unit includes circuitry to distinguish between loss of bus power due to switchovers between power sources and loss of bus power due to shutdown of the aircraft. The power supply unit includes a low voltage lockout circuit to interrupt the supply of power when the aircraft bus voltage falls below a minimum value.
8 Citations
15 Claims
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1. A power supply unit for use with an aircraft power bus, comprising:
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a connection circuit being electrically coupled to the aircraft power bus and providing the power supply unit with both charge and discharge paths; an energy storage circuit being electrically coupled to the connection circuit, wherein during charging periods the energy storage circuit receives charge from the aircraft power bus through the charge path, and during discharging periods the energy storage circuit provides charge to the aircraft power bus through the discharge path; a comparator circuit that is electrically coupled to the energy storage circuit and that determines if there is adequate voltage on the aircraft power bus; and a time delay circuit that is electrically coupled to the comparator circuit and that, in response to a determination by the comparator circuit that there is inadequate voltage on the aircraft power bus, distinguishes when a loss of power on the aircraft power bus is due to a temporary disruption and when it is due to a desired shut down. - View Dependent Claims (2, 3, 4)
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5. A power supply unit for use with an aircraft power bus, comprising:
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a connection circuit having positive and negative input terminals for connecting to two corresponding terminals of an aircraft power bus; and an energy storage circuit electrically connected to said connection circuit; wherein said connection circuit provides separate charging and discharging paths between said input terminals and said energy storage circuit, and wherein said connection circuit includes an impedance in said charging path and a switch in said discharge path; and wherein said power supply unit includes circuitry that controls operation of said switch based on voltage differences between two nodes located at opposite ends of said impedance. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A power supply unit for use with an aircraft power bus, comprising:
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a connection circuit having positive and negative input terminals for connecting to two corresponding terminals of an aircraft power bus; and an energy storage circuit electrically connected to said connection circuit; wherein said connection circuit provides separate charging and discharging paths between said input terminals and said energy storage circuit, and wherein said connection circuit includes an impedance in said charging path and a switch in said discharge path; wherein said power supply unit includes circuitry that controls operation of said switch based on voltage differences between two nodes located at opposite ends of said impedance; and wherein said energy storage circuit comprises a plurality of energy storage devices and a second impedance defining a path in parallel with said energy storage devices. - View Dependent Claims (12, 13)
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14. A power supply unit for use with an aircraft power bus, comprising:
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a connection circuit having positive and negative input terminals for connecting to two corresponding terminals of an aircraft power bus; and an energy storage circuit electrically connected to said connection circuit; wherein said connection circuit provides separate charging and discharging paths between said input terminals and said energy storage circuit, and wherein said connection circuit includes an impedance in said charging path and a switch in said discharge path; wherein said power supply unit includes circuitry that controls operation of said switch based on voltage differences between two nodes located at opposite ends of said impedance; and wherein said power supply unit further comprises a comparator circuit and a timer delay circuit that controls operation of said switch, said comparator circuit being electrically connected to the nodes and having an output electrically connected to an input of the timer delay circuit, and wherein said comparator circuit and said timer delay circuit together operate to turn off said switch if the aircraft power bus has lost power for more than a selected amount of time. - View Dependent Claims (15)
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Specification