Aircraft Power Supply Unit for Uninterrupted Bus Switchover
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Solution Overview
Problem
Aircraft electrical systems experience temporary power interruptions during switchover between different power sources, leading to potential electronics shutdowns or data loss due to the 'break-before-make' principle used in contactors.
Innovation Solution
A power supply unit with a connection circuit and energy storage circuit that provides charge and discharge paths, using voltage differences across an impedance to control a switch for uninterrupted power delivery, including optional circuits like a timer delay and low voltage lockout to distinguish between temporary disruptions and intentional shutdowns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If contactors operate on a break-before-make principle to switch between power sources, then the switching operation is simple and reliable, but temporary power interruptions occur causing electronics to shutdown or data loss
Solution Approach 1:
The energy storage circuit is pre-charged during normal operation before a power interruption occurs. When a break-before-make switchover happens, the pre-stored energy in the capacitor immediately supplies power to the bus, preventing data loss and electronics shutdown. This preliminary energy storage resolves the contradiction by preparing the system in advance to handle the inevitable interruption.
Solution Approach 2:
The energy storage circuit acts as an intermediary between the power sources and the aircraft electrical system. During contactor switching, this intermediary component provides a buffer that maintains power flow to the bus even when the primary power path is temporarily interrupted, thus preventing data loss while allowing simple break-before-make switching operation.
2Reliability
If an energy storage circuit is added to provide uninterrupted power during switchover, then power continuity is improved, but device complexity increases
Solution Approach 1:
The energy storage circuit is designed to perform multiple functions: it charges during normal operation, provides backup power during interruptions, and automatically disconnects during intentional shutdowns. This multi-functionality justifies the added complexity by delivering significant reliability improvements across multiple operating scenarios without requiring separate systems for each function.
Solution Approach 2:
The power supply unit incorporates automatic control circuitry that monitors bus voltage and autonomously manages the energy storage circuit's charging and discharging operations. The system self-regulates without external intervention, detecting power interruptions and intentional shutdowns, and appropriately controlling the switch to maintain power continuity or disconnect as needed, thereby managing the complexity through automation rather than manual control.
3Measurement precision
If the power supply unit continuously monitors voltage to control power supply, then power management precision is improved, but energy consumption increases
Solution Approach 1:
The monitoring and control circuitry operates in a highly efficient manner, rapidly detecting voltage changes and making instantaneous decisions about power supply state. Rather than continuous high-power monitoring, the system uses efficient sampling and threshold-based detection that consumes minimal energy while maintaining precise control over the energy storage circuit's operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures continuous power supply during switchover periods, preventing data loss and electronics shutdowns, while also protecting against low voltage and short circuit faults, enhancing reliability and reducing maintenance costs.
Implementation Method 1
an energy storage circuit (30) electrically coupled to the connection circuit
Data Source
AI summary
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.