eVTOL Low-Voltage Bus Architecture for Fast Backup Switching
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Solution Overview
Problem
Existing power distribution systems in powered aerial vehicles, particularly those using low-voltage DC buses, suffer from issues such as noise propagation, overloads, and increased weight due to the need for primary and backup power sources.
Innovation Solution
A power distribution system for aircraft comprising at least two power supplies, each connected to a step-down converter and a bus via a switching device, with an alternate power supply connected to both buses via a separate switching device, allowing for rapid switching to a backup power source in case of failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extant power distribution systems use interconnected low-voltage DC buses with primary and backup power sources, then power availability is maintained during power source failure, but system weight increases and noise propagation occurs across buses
Solution Approach 1:
The power distribution system divides the aircraft electrical system into multiple independent channels, each with its own power source and bus. The buses are electrically separated by isolation devices that prevent noise and disturbances from propagating between channels while maintaining power availability through rapid switching capability.
Solution Approach 2:
Isolation devices act as intermediaries between power distribution channels, blocking electrical noise and disturbances while allowing controlled power transfer. These devices enable the system to maintain reliability without requiring heavy interconnected bus structures.
2Reliability
If extant power distribution systems use interconnected low-voltage DC buses with primary and backup power sources, then power availability is maintained during power source failure, but electrical noise and disturbances propagate across buses
Solution Approach 1:
The system segments the electrical power distribution into independent channels with electrically isolated buses. Each channel operates independently with its own power source, preventing noise and electrical disturbances from propagating between channels while maintaining overall system reliability through redundant power paths.
Solution Approach 2:
Isolation devices serve as intermediaries between power channels, blocking electrical noise and disturbances while enabling controlled power transfer during normal operation and failure scenarios. This mediation allows the system to achieve both noise isolation and power availability.
3Reliability
If extant power distribution systems use primary and backup power sources for each low-voltage DC bus, then power redundancy is achieved, but device complexity and maintenance requirements increase
Solution Approach 1:
Each power channel is designed as a universal, self-contained unit that can independently provide power to multiple buses. The channels are identical in structure and function, allowing any channel to assume the role of another in case of failure, thereby reducing overall system complexity through standardization.
Solution Approach 2:
The system employs dynamic switching capability that allows rapid reconfiguration of power paths during normal operation and failure scenarios. This dynamic adaptability enables the system to maintain power redundancy without requiring complex static interconnections between all power sources and buses.
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 provides high-availability low-voltage power to aircraft, maintaining electrical separation of buses after a single failure, and ensuring rapid alternate power supply activation within 50 milliseconds, thereby enhancing safety and reducing weight compared to traditional systems.
Implementation Method 1
a first power source connected to a first step-down converter, the first step-down converter being connected via a first switching device to a first bus
Implementation Method 2
the first step-down converter being connected via a first switching device to a first bus
Data Source
AI summary
In an embodiment, a system may comprise at least two power supplies which may comprise a first power source, a first step-down converter, a first switching device, a first bus, a second power source, a second step-down converter, a second switching device, and a second bus, the first and second buses being electrically separate. An exemplary system may further comprise an alternate power supply comprising a third power source and an alternate step-down converter connected to at least the first and second buses via at least a third switching device, the alternate power supply acting as a backup power supply configured to be used after a failure of one or more of the at least two power supplies. In some embodiments, the first and second switching devices may be controlled by at least a first controller and the at least third switching device may be controlled by an alternate controller.