Aircraft DC Power Channel Switching for Fault-Tolerant Load Isolation
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Solution Overview
Problem
Existing electrical power systems in aircraft lack sufficient fault tolerance, which can lead to hazardous conditions and system certification issues due to the potential for faults in electrical generation and distribution to affect critical loads and the wider electrical distribution system.
Innovation Solution
An electrical power system is designed with an electrical power source outputting multiple DC power channels and a switching arrangement connecting multiple DC load channels to these power channels, allowing for redundancy and fault tolerance by ensuring each load channel receives power from only one power channel, and in case of a fault, power can be rerouted from non-faulted channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a non-dedicated electrical power system is used to power both engine accessories and aircraft electrical systems, then efficiency increases and weight/complexity reduce, but fault tolerance deteriorates as faults can affect critical loads
Solution Approach 1:
The electrical power system is segmented into multiple independent DC power channels (at least two channels), each capable of supplying power to loads. This segmentation allows isolation of faults to specific channels while maintaining power supply through other channels, thus improving fault tolerance without requiring completely separate dedicated systems for each load.
Solution Approach 2:
The system employs dynamic switching capability where the switching arrangement can reconfigure connections between power channels and load channels in real-time. When a fault is detected in one power channel, the system dynamically reroutes loads to alternative power channels, maintaining operational reliability while using a shared power distribution architecture.
2Quantity of substance
If electrical loads are connected to a shared power system, then weight and complexity reduce, but fault propagation risk increases as one load fault can affect other loads
Solution Approach 1:
The system segments the electrical distribution into multiple independent power channels and load channels. This segmentation creates natural isolation barriers that prevent fault propagation between channels. Each channel can be independently protected and controlled, allowing the system to maintain a lightweight shared architecture while limiting the spread of faults.
Solution Approach 2:
The switching arrangement acts as an intermediary between power channels and load channels, providing controlled connection and disconnection capability. This intermediary can isolate faulty loads or channels from the rest of the system while maintaining connections to healthy components, preventing fault propagation without requiring heavy protective equipment on each individual load.
3Reliability
If dedicated generators are used for each electrical load, then reliability improves, but weight and complexity increase
Solution Approach 1:
Each DC power channel is designed to be universal and multi-functional, capable of supplying power to multiple different load channels depending on operational requirements. This universality allows a smaller number of power sources to provide the same reliability benefits as multiple dedicated generators, reducing system complexity while maintaining the ability to supply power to all loads under various operating conditions.
Solution Approach 2:
The system employs dynamic reconfiguration capability where the switching arrangement can adaptively assign power channels to different load channels based on operational needs and fault conditions. This dynamic allocation provides reliability comparable to dedicated generators while allowing a more compact and less complex power generation architecture, as the same power channels can serve different loads at different times.
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
Electrical power systems for distributing electrical power in aircraft are described. One such electrical power system comprises: an electrical power source configured to output a number R ≥ 2 of dc power channels 206-209, each dc power channel 206-209 having a respective index r = (1, ..., R); and a group of N dc load channels 400-1200 connected to the R dc power channels 206-209 by a switching arrangement 410-1210, wherein each dc load channel 400-1200 has a respective index n = (1, ..., N) and R < N ≤ 2R. The switching arrangement 410-1210 is operable to connect the r-th power channel to the n-th load channel according to the relationship: rn={1,n=1n2andn2+1,1<n<Nandn=0mod2n−12andn+12,1<n<Nandn=1mod2R,n=N.