Solid state radio frequency (SSRF) microwave oven for aircraft galley
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Solution Overview
Problem
Conventional microwave ovens in aircraft galleys face challenges such as power fluctuations, weight issues due to additional components, suboptimal radiation distribution leading to 'hotspots' and 'coldspots', and complex heat dispersal, especially under aircraft cabin pressure conditions.
Innovation Solution
A solid-state radio frequency (RF) microwave oven with an array of individually controllable RF emitter modules that monitor internal food temperature and adjust power accordingly, eliminating the need for magnetron-based components and optimizing heat distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetron-based microwave ovens are used in aircraft galleys, then microwave heating function is provided, but power fluctuations occur and reliability deteriorates
Solution Approach 1:
The patent divides the single magnetron into multiple solid-state RF emitter modules (e.g., 4-8 modules) distributed across the oven cavity. Each module can be independently controlled, allowing gradual power delivery rather than full-on/full-off switching. This segmentation resolves the contradiction by enabling fine-grained power management that maintains reliability while ensuring power stability for the aircraft electrical system.
Solution Approach 2:
The patent implements dynamic control of RF emitter modules based on real-time feedback from temperature sensors and returned energy detection. The control system continuously adjusts which modules are active and at what power levels, transitioning from static magnetron switching to dynamic modular control. This resolves the contradiction by maintaining reliable operation through adaptive power delivery that prevents electrical system stress.
2Reliability
If magnetron-based microwave ovens are used, then heating function is achieved, but additional components increase weight
Solution Approach 1:
The patent extracts and eliminates the magnetron and its associated high-voltage power supply, waveguides, and stirrer systems. These heavy components are replaced with solid-state RF emitter modules that operate directly from the aircraft's 28V DC electrical system. This extraction resolves the contradiction by removing unnecessary weight while maintaining reliable heating function through the simpler solid-state architecture.
Solution Approach 2:
The patent replaces the mechanical magnetron-based electromagnetic generation system with solid-state electronic RF emission. The mechanical stirrer system is eliminated in favor of electronically controlled phase and amplitude modulation of multiple RF modules. This substitution resolves the contradiction by dramatically reducing weight while preserving heating reliability through electronic control.
3Reliability
If magnetron-based microwave ovens are used, then heating is provided, but radiation distribution is suboptimal causing hotspots and coldspots
Solution Approach 1:
The patent segments the single radiation source into multiple distributed RF emitter modules positioned throughout the oven cavity. This segmentation allows each module to contribute to heating its local region, ensuring uniform energy distribution. The contradiction is resolved by eliminating hotspots and coldspots through spatial distribution of emission sources while maintaining reliable cooking results.
Solution Approach 2:
The patent assigns different operational characteristics to different RF emitter modules based on their positions and the specific cooking task. The control system activates specific modules with specific power levels tailored to the local heating needs of different food regions. This local quality approach resolves the contradiction by ensuring consistent cooking results through customized local heating while maintaining overall system reliability.
4Reliability
If magnetron-based microwave ovens are used, then heating function is provided, but heat dispersal becomes extremely complicated under aircraft cabin pressure
Solution Approach 1:
The patent replaces the magnetron-based heating system with solid-state RF emitters that operate more efficiently under reduced pressure conditions. The solid-state electronics eliminate the need for complex high-voltage power supply systems and magnetic field management required by magnetrons in aircraft cabin environments. This substitution resolves the contradiction by simplifying the overall system while maintaining reliable heating function under varying atmospheric conditions.
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, increases oven capacity, ensures even cooking, and simplifies power management, while extending the lifespan of the cooking device and preventing interference with aircraft communications.
Implementation Method 1
an array of spaced or grouped RF emitter modules distributed across an upper interior surface of the oven cavity
Implementation Method 2
the RF modules detect returned energy unabsorbed by the food, estimating and monitoring the internal temperature of the food
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A solid-state radio frequency (RF) microwave oven for an aircraft galley is dimensioned to fit the galley and includes within the oven cavity an array of RF modules disposed on the upper interior surface of the cavity. Each RF module includes one or more RF emitters programmable to heat meals placed within the oven cavity by emitting tunable RF signals. The RF modules may monitor the internal temperature and doneness of the food by detecting returned unabsorbed energy. An oven control module (OCM) may communicate with the aircraft galley network, selectively manage the activation and deactivation of RF modules depending on the food being cooked and its changing internal temperature, and tune emitted RF signals to avoid interference with aircraft communication systems. Compact heat sinks may be located within the rear of the oven cavity for the removal of excess energy from the oven.