Aircraft USB Power Load Distribution for Over-Demand Control
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Solution Overview
Problem
Commercial passenger aircraft face challenges in managing power distribution due to increased demand from passengers' personal electronic devices, leading to potential over-demand conditions that can overwhelm the electrical system, necessitating a solution that prevents power denial to passengers while ensuring safety.
Innovation Solution
A power management and load distribution system that dynamically adjusts power capability settings based on measured power output, using AC/DC conversion circuits and programmable power capability outlets to negotiate power contracts with devices, ensuring continuous power supply without exceeding predetermined maximum limits, and supporting USB Type C and Type A connectors for high-power devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is denied to passengers to prevent over-demand conditions, then aircraft electrical system safety is improved, but passenger satisfaction deteriorates
Solution Approach 1:
The system dynamically adjusts power capability settings based on real-time measured power output, transitioning from static power denial to adaptive power management. The PMLD circuit continuously monitors power consumption and adjusts the power capability setting to match available capacity, allowing maximum power distribution without exceeding safety limits.
Solution Approach 2:
The system changes the power capability parameter dynamically based on measured power output. When power output is below maximum limits, the power capability setting is increased to non-zero values to provide power to PEDs. When power output approaches maximum limits, the setting is decreased to prevent over-demand conditions, thus maintaining safety while optimizing power utilization.
2Ease of operation
If power capability setting is increased to support more PEDs, then passenger satisfaction is improved, but risk of over-demand condition increases
Solution Approach 1:
The system implements continuous feedback by monitoring measured power output and using this information to adjust the power capability setting. The PMLD circuit compares measured power output against predetermined maximum power limits and dynamically modifies the power capability setting accordingly, creating a closed-loop control system that prevents over-demand conditions while maximizing power availability.
Solution Approach 2:
The system performs self-regulation by automatically adjusting power capability settings based on real-time power output measurements without requiring external intervention. The PMLD circuit autonomously monitors power consumption, evaluates against maximum limits, and modifies power capability settings to maintain safe operation while supporting passenger PED power needs.
3Device complexity
If fixed power supply capacity is used, then aircraft electrical system simplicity is maintained, but adaptability to variable power demand deteriorates
Solution Approach 1:
The system introduces dynamic power capability settings that can be adjusted in real-time based on measured power output, transforming the fixed power supply into an adaptive system. The PMLD circuit enables the power supply to respond to variable power demands from different numbers and types of PEDs while maintaining the underlying fixed capacity generator structure.
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
The system efficiently manages power distribution, preventing unsafe overloads while maintaining continuous power to passenger devices, allowing for scalable and adaptable power allocation based on changing passenger loads.
Implementation Method 1
an AC/DC conversion circuit communicatively coupled to the PMLD circuit and operable to convert the AC power into a DC power for supplying the DC power to at least one personal electronic device
Data Source
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AI summary
A power management system includes a power management and load distribution (PMLD) circuit within an airplane coupled to an AC power source, at least one AC/DC conversion circuit operable to convert the AC power into a DC power, and at least one programmable output capability outlet (PPCO) circuit operable to receive the DC power. The PMLD circuit stores a predetermined maximum power limit, continuously measures a power output, and increases or decreases a power capability setting based on a comparison of the measured power output to the predetermined maximum power limit. The PPCO circuit includes a USB connector couplable to a personal electronic device (PED) of a passenger for charging the PED at an amount of DC power indicated by the power capability setting. The PPCO circuit is also operable to negotiate a power contract with the PED.