Fuel Cell-Battery Power Switching for Variable Aircraft Loads
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Solution Overview
Problem
Existing electrical systems in aircraft struggle to meet power demands across a broad range of operating scenarios, particularly in incorporating greater electrical functionality on the airframe and propulsive devices like gas turbine engines.
Innovation Solution
An electrical system comprising a battery, fuel-cell pack, switching arrangement, DC-DC converter, and control system that can operate in battery-charge, combined-drive, and battery-isolation modes, with a control system monitoring power parameters to selectively reconfigure the system for optimal power distribution and voltage regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a fuel-cell pack and battery are used together to meet power demand across broad operating scenarios, then the system can provide sufficient power for loads like propulsive devices, but the system mass and size increase
Solution Approach 1:
The system dynamically reconfigures the electrical architecture between two modes: battery-charge mode for low power demand (charging battery from fuel cell) and combined-drive mode for high power demand (both fuel cell and battery driving load). This dynamic switching allows the system to meet varying power demands without continuously carrying the full capacity of both power sources at maximum output, thereby reducing overall system mass while maintaining power capability.
Solution Approach 2:
The system changes operational parameters by switching between different connectivity configurations (series/parallel arrangements) of the fuel-cell pack and battery. This parameter change enables the same hardware components to serve different functions at different times, optimizing the power-to-mass ratio across the full operating range.
2Productivity
If the system is configured to maintain optimal voltage levels across varying power demands, then power distribution efficiency is improved, but the device complexity increases due to switching arrangement and control system
Solution Approach 1:
The switching arrangement dynamically reconfigures the electrical connections between battery, fuel-cell pack, and load based on real-time power demand assessment. The control system monitors load requirements and switches between battery-charge mode and combined-drive mode, maintaining optimal voltage levels without requiring complex continuous regulation circuitry. This dynamic switching approach simplifies the overall control architecture compared to continuous voltage regulation.
Solution Approach 2:
The switching arrangement acts as an intermediary that manages power flow between the battery, fuel-cell pack, and load. By introducing this switching mediator, the system achieves efficient power distribution through discrete mode transitions rather than complex continuous control, reducing the overall device complexity while maintaining productivity.
3Loss of energy
If the system selectively reconfigures between battery-charge mode and combined-drive mode, then efficiency is improved across different operating scenarios, but the ease of operation decreases due to mode switching requirements
Solution Approach 1:
The control system automatically monitors power demand parameters and autonomously determines the appropriate operating mode (battery-charge or combined-drive). The system self-manages the mode transitions based on real-time conditions without requiring manual intervention or complex user decisions, thereby maintaining energy efficiency while preserving operational simplicity. The full-service nature of the control system compensates for the added operational complexity of mode switching.
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 and voltage across varying loads, enhancing electrical functionality and efficiency in aircraft systems.
Implementation Method 1
a DC-DC converter; wherein the switching arrangement is operable to selectively configure the electrical system in at least one of a battery-charge mode and a combined-drive mode; wherein in the battery-charge mode the battery is coupled in series to the fuel-cell pack and the load via the DC-DC converter
Implementation Method 2
a fuel-cell pack; wherein in the battery-charge mode the battery is coupled in series to the fuel-cell pack and the load via the DC-DC converter for simultaneous charging of the battery and driving of the load by the fuel-cell pack
Implementation Method 3
a battery; wherein in the combined-drive mode the battery is coupled in series to the fuel-cell pack and the load via the DC-DC converter for driving of the load by both the battery and the fuel-cell pack
Data Source
AI summary
An electrical system includes: a battery; a fuel-cell pack; a load electrically coupled to the fuel-cell pack; a switching arrangement electrically coupled to the battery, the fuel-cell pack and the load; a DC-DC converter; and a control system. The switching arrangement configures the electrical system in at least one of a battery-charge mode and a combined-drive mode. In the battery-charge mode the battery is coupled in series to the fuel-cell pack and the load via the DC-DC converter for simultaneous charging of the battery and driving of the load by the fuel-cell pack. In the combined-drive mode, the battery is coupled in series to the fuel-cell pack and the load via the DC-DC converter for driving of the load by both the battery and the fuel-cell pack. The control system is configured to: monitor a parameter of an electrical power provided to the load; and control the DC-DC converter.