Asynchronous Resonant Mode Tracking for Electromagnetic Cooking
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Solution Overview
Problem
Conventional microwave ovens using magnetron-based sources for electromagnetic cooking suffer from non-uniform heating due to a single, non-coherent source, leading to inefficiencies in cooking food, as they lack the ability to tune frequencies and control heating patterns effectively.
Innovation Solution
An electromagnetic cooking device with multiple high-power amplifiers and RF feeds, controlled by a system that scans the cavity to create a resonance map, identifies resonant modes, and develops a heating strategy to implement specific frequencies and phases of electromagnetic radiation for uniform cooking, utilizing an asynchronous manager to detect and adapt to changes in the cooking environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single magnetron-based source is used for electromagnetic cooking, then the device complexity is reduced, but the heating uniformity deteriorates
Solution Approach 1:
The patent divides the single magnetron source into multiple solid-state power amplifiers (at least two), each feeding electromagnetic energy through separate waveguides into the cavity. This segmentation allows independent control of each source, enabling uniform heating across different cavity regions while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The patent introduces spatial distribution by placing multiple feed points at different locations within the cavity rather than using a single centralized source. This dimensional approach to source distribution creates multiple standing wave patterns that can be combined to achieve uniform heating throughout the three-dimensional cavity space.
2Device complexity
If a single magnetron source is used, then the device structure is simpler, but the frequency tuning capability is lost
Solution Approach 1:
The patent implements dynamic frequency control by allowing each solid-state power amplifier to operate at independently selectable frequencies within a range around the magnetron frequency. This dynamic capability enables the system to adapt to different food loads, cavity conditions, and cooking requirements, something impossible with a fixed-frequency magnetron.
Solution Approach 2:
The patent changes the fundamental operating parameter of the microwave source from fixed frequency (magnetron) to variable frequency (solid-state amplifiers). This parameter change enables frequency tuning and selection of optimal operating points, improving heating efficiency and adaptability while maintaining reasonable structural complexity.
3Measurement precision
If resonant mode scanning is performed continuously, then the heating strategy accuracy is improved, but the cooking time increases
Solution Approach 1:
The patent performs resonant mode scanning and identification before the actual cooking process begins. By pre-characterizing the cavity's resonant modes, standing wave patterns, and optimal feed point configurations, the system establishes a heating strategy in advance. This preliminary action eliminates the need for continuous scanning during cooking, saving time while maintaining heating accuracy.
Solution Approach 2:
The patent maintains continuous heating by using the pre-determined heating strategy throughout the cooking process without interrupting to re-scan for resonant modes. The solid-state amplifiers continuously deliver electromagnetic energy according to the optimized parameters established during the preliminary scanning phase, ensuring uninterrupted and efficient cooking.
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 enables more even and controlled heating patterns, improving cooking efficiency by dynamically adjusting to changes in the food load and cavity conditions, ensuring uniform cooking and optimizing energy transfer.
Implementation Method 1
a plurality of high power amplifiers and RF feeds for introducing electromagnetic radiation into the cavity
Implementation Method 2
identify resonant modes in the resonance map
Implementation Method 3
A conventional microwave oven cooks food by a process of dielectric heating in which a high-frequency alternating electromagnetic field is distributed throughout an enclosed cavity. Microwave frequencies, which are a sub-band of the radio frequency spectrum at or around 2.45 GHz, cause dielectric heating primarily by absorption of energy in water.
Data Source
AI summary
An electromagnetic cooking device includes an enclosed cavity configured to receive a food load, a plurality of high power amplifiers and RF feeds for introducing electromagnetic radiation into the cavity, and a controller for controlling the frequency, phase and amplitude of the electromagnetic radiation fed into the cavity by the RF feeds. The controller is configured to identify resonant modes, develop and implement a heating strategy based on the resonant modes, utilize an asynchronous manager to automatically detect when a variable has changed to a degree that requires an updated identification of resonant modes and an updated heating strategy, and if the asynchronous manager determines that updates are needed, repeat the steps above to determine a new heating strategy, otherwise continue with the current heating strategy.