Bidirectional Converter Switching for Hybrid Aircraft Propulsion
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Solution Overview
Problem
Existing hybrid aircraft propulsion systems face challenges in efficiently managing power between low and high pressure machines, requiring multiple converters and increasing weight, cost, and complexity.
Innovation Solution
A motor control unit (MCU) with bidirectional capabilities, including rectifiers and inverters, is used to selectively couple low and high pressure machines to either an inverter or a rectifier, allowing for efficient power management with a single converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple converters are used to manage power between low and high pressure machines, then power management capability is improved, but weight and system complexity increase
Solution Approach 1:
The patent combines multiple converter functions into a single bidirectional converter that can handle both low pressure and high pressure machine power management. The bidirectional converter integrates rectifier and inverter capabilities, allowing one device to perform the functions previously requiring multiple separate converters, thereby reducing overall system weight while maintaining full power management capability.
Solution Approach 2:
The bidirectional converter is designed with universal functionality to manage power for both low pressure and high pressure machines. It can operate in multiple modes (rectification and inversion) and can be selectively coupled to different machines through switch sets, making it a multi-functional device that replaces multiple specialized converters with one versatile unit.
2Adaptability or versatility
If multiple converters are used to manage power between low and high pressure machines, then power management capability is improved, but system complexity increases
Solution Approach 1:
The patent merges multiple converter systems into a single bidirectional converter unit, reducing the number of components that need to be integrated and controlled. This consolidation simplifies the overall system architecture, reduces interconnections, and decreases control complexity while maintaining the ability to manage power for both low and high pressure machines effectively.
Solution Approach 2:
The bidirectional converter serves as a universal power management device that can interface with both low pressure and high pressure machines. Its multi-functional design eliminates the need for separate dedicated converters for each machine, thereby reducing system complexity while preserving full adaptability for power management across different operating conditions.
3Adaptability or versatility
If multiple converters are used to manage power between low and high pressure machines, then power management capability is improved, but cost increases
Solution Approach 1:
The patent consolidates multiple converter functions into a single bidirectional converter, reducing the total component count and associated manufacturing costs. By integrating rectifier and inverter functions in one device that serves both low and high pressure machines, the system reduces material costs, assembly costs, and maintenance costs while maintaining full power management capability.
Solution Approach 2:
The bidirectional converter's universal design allows one device to replace multiple specialized converters, resulting in cost savings through reduced component procurement, simplified manufacturing processes, and lower installation and maintenance expenses. The multi-functional capability is achieved without compromising power management effectiveness.
4Weight of moving object
If a single bidirectional converter is used, then weight and cost are reduced, but reliability may decrease
Solution Approach 1:
The bidirectional converter incorporates dynamic switching capabilities through switch sets that can selectively couple either the low pressure machine or high pressure machine to the converter. This dynamic reconfiguration allows the system to adapt to different operating conditions and provides flexibility in power management while maintaining reliability through controlled operational modes.
Solution Approach 2:
The converter can change its operational parameters by switching between rectifier and inverter modes, and by selectively connecting to different machines. These parameter changes enable the single converter to perform multiple functions dynamically, maintaining system reliability through adaptive operation rather than requiring redundant static components.
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 solution reduces weight and cost by eliminating the need for multiple converters, increases system reliability by allowing converter swapping in case of failure, and simplifies power management in hybrid propulsion systems.
Implementation Method 1
the motor controller device or the generator controller is configured to provide the control signal
Implementation Method 2
The MCU can include one or both of a rectifier and an inverter and, thus, in some instances can be bidirectional
Data Source
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AI summary
A system includes a low pressure machine (206), a high pressure machine (202), a motor controller device, a first set of switches configured to selectively couple the low pressure machine (206) to an inverter or a rectifier included in the motor controller device, based on a control signal, and a second set of switches configured to selectively couple the high pressure machine (202) to the inverter or the rectifier, based on the control signal.