Multiple RF Feed Cooking Cavity Uniform Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional microwave ovens with magnetron-based sources suffer from non-uniform heating due to a single, non-coherent microwave source, leading to inefficiencies in cooking processes.
Innovation Solution
An electromagnetic cooking device with multiple RF feeds that allow for coherent electromagnetic radiation, enabling precise control of frequency, phase, and amplitude to ensure uniform heating by measuring and analyzing backward power to adjust cooking strategies based on changes in food load characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single magnetron-based microwave source is used, then the device complexity is reduced, but the heating uniformity deteriorates
Solution Approach 1:
The single magnetron source is segmented into multiple independent RF feeds (at least two), each capable of emitting coherent electromagnetic radiation. This segmentation allows the system to maintain lower overall complexity while achieving uniform heating through coordinated operation of multiple feeds with controllable phase and amplitude.
Solution Approach 2:
Multiple RF feeds are merged to work cooperatively, with their electromagnetic fields combining in the cooking cavity. By controlling the phase and amplitude of each feed, the system achieves uniform heating distribution that overcomes the limitations of a single source while managing device complexity.
2Stability of the object's composition
If mechanical solutions like microwave stirrer and turntable are added, then heating uniformity is improved, but device complexity increases
Solution Approach 1:
The mechanical stirring and rotating mechanisms are replaced with an electronic field-based solution. Multiple RF feeds with controllable phase and amplitude create dynamic electromagnetic field patterns that achieve uniform heating without mechanical movement, thereby improving heating uniformity while reducing device complexity.
3Stability of the object's composition
If multiple RF feeds with coherent radiation are used, then heating uniformity is improved, but measurement and control complexity increases
Solution Approach 1:
The system implements feedback control by measuring backward power at each RF feed and using this information to adjust the operation. The controller analyzes backward power to determine efficiency and detect food load characteristics, automatically adjusting phase and amplitude to maintain optimal heating uniformity throughout the cooking process.
4Manufacturing precision
If efficiency measurement and coefficient of variation monitoring are implemented, then cooking control precision is improved, but device complexity increases
Solution Approach 1:
The system performs self-diagnosis and self-adjustment by automatically measuring backward power, calculating efficiency, and determining coefficient of variation. The controller monitors these parameters and autonomously adjusts RF feed operations to maintain optimal cooking precision without requiring external intervention or complex additional hardware.
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 solution achieves more even and controlled heating patterns, improving cooking efficiency and preventing overheating or underheating by dynamically adjusting the electromagnetic radiation based on food load changes.
Implementation Method 1
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 at or around 2.45 GHz cause dielectric heating primarily by absorption of energy in water.
Implementation Method 2
the plurality of RF feeds configured to allow measurement of forward and backward power at the plurality of RF feeds; and a controller configured to: (a) cause generation of RF excitations at a specified frequency and phase shifts from each of the plurality of RF feeds
Data Source
AI summary
An electromagnetic cooking device is provided having a controller and a plurality of RF feeds configured to introduce electromagnetic radiation into an enclosed cavity to heat up a food load. The controller is configured to: (a) cause the generation of RF excitations at a specified frequency and phase shifts from each of the plurality of RF feeds for a predetermined time period; (b) during the predetermined time period: measure and analyze the backward power at the plurality of RF feeds to calculate efficiency, determine a coefficient of variation in the efficiency, and monitor the coefficient of variation to identify possible changes in a characteristic of the food load; and (c) repeatedly perform steps (a) and (b) until such time that a possible change is identified in a characteristic of the food load based on changes in the coefficient of variation. The characteristic may be the volume of the food load.