Hybrid Fuel Cell Battery Switching for Variable Load Voltage
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Solution Overview
Problem
Current electrical systems for aircraft fail to efficiently manage power demand across a broad range of operating scenarios, particularly in meeting varying load requirements while maintaining optimal voltage levels, especially when integrating fuel cells and batteries.
Innovation Solution
An electrical system with a switching arrangement and control system that configures between battery-isolation, battery-charge, and combined-drive modes, allowing the battery and fuel-cell pack to operate in series or isolation based on power demand, monitored parameters, and voltage thresholds to maintain target voltage ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single power source (battery or fuel cell) is used to drive the load, then the system structure is simple, but the system cannot meet power demand across a broad range of operating scenarios
Solution Approach 1:
The patent combines a battery and a fuel-cell pack to form a hybrid power system. The battery and fuel cell are electrically coupled through a switching arrangement that enables multiple configuration modes (battery-isolation mode, battery-charge mode, combined-drive mode), allowing the system to adapt to varying power demands while maintaining manageable complexity through structured integration.
Solution Approach 2:
The switching arrangement dynamically reconfigures the electrical connections between the battery, fuel-cell pack, and load based on real-time power demand. The control system monitors operating conditions and selectively transitions between different operational modes, enabling the system to optimize performance across diverse scenarios without requiring a completely redesign for each condition.
2Ease of operation
If the battery and fuel-cell pack are always coupled in series to drive the load, then the power output is increased, but the battery cannot be isolated for independent operation or charging
Solution Approach 1:
The switching arrangement is segmented into multiple switching devices (first switching device, second switching device, third switching device) that can be independently controlled. This segmentation allows the system to create distinct operational configurations: battery-isolation mode (battery disconnected from load), battery-charge mode (battery charged by fuel cell while load is driven), and combined-drive mode (both battery and fuel cell driving load in series), providing operational flexibility without overwhelming complexity.
3Reliability
If the system uses fixed voltage output from the fuel cell, then the system is simple to control, but the load voltage cannot be maintained within target ranges under varying power demands
Solution Approach 1:
The control system continuously monitors the voltage output and operational mode of the electrical system. Based on feedback regarding the current operating scenario and load requirements, the control system selectively actuates the switching devices to transition between operational modes, ensuring that the load voltage is maintained within target ranges. This closed-loop control approach provides voltage stability while adapting to varying power demands through automated decision-making.
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
This configuration ensures efficient power management, maintaining load voltage within target ranges and optimizing energy efficiency by selectively using battery and fuel-cell pack combinations, reducing the need for large energy storage capacity and minimizing system size and mass.
Implementation Method 1
a fuel-cell pack
Implementation Method 2
a battery
Data Source
AI summary
An electrical system includes: a battery; a fuel-cell pack; a load; a switching arrangement; and a control system. The switching arrangement selectively configures the electrical system in a battery-isolation mode and at least one of a battery-charge mode and a combined-drive mode. In the battery-isolation mode, the battery is decoupled from the fuel-cell pack and the load, and the fuel-cell pack is coupled to the load for driving of the load by the fuel-cell pack. In the battery-charge mode, the battery is coupled in series to the fuel-cell pack and the load 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 for driving of the load by both the battery and the fuel-cell pack.