Electromagnetic cooking device with automatic liquid heating and method of controlling cooking in the electromagnetic cooking device
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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 and a controller that analyzes forward and backward power to calculate efficiency, detects temperature changes, and adjusts power levels to achieve uniform heating by monitoring resonance shifts and coefficient of variation.
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 solid-state RF sources (at least two), each capable of generating coherent microwave radiation. This segmentation allows independent control of each source to achieve uniform heating across different cavity regions while maintaining system functionality.
Solution Approach 2:
The system dynamically controls the phase, frequency, and amplitude of each RF source based on real-time cavity conditions and load characteristics. This dynamic adjustment enables adaptive heating patterns that maintain uniformity across varying cooking scenarios.
2Stability of the object's composition
If multiple RF feeds are introduced for uniform heating, then the heating uniformity is improved, but the device complexity increases
Solution Approach 1:
Each RF feed is designed to perform multiple functions: generating coherent radiation, being independently controlled for spatial distribution, and contributing to overall heating uniformity. The solid-state sources provide universal functionality across different operating conditions and cavity configurations.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor heating effectiveness and adjust RF source parameters in real-time. This feedback control enables the multiple RF feeds to work cooperatively, automatically optimizing their operation to maintain uniform heating while managing system complexity.
3Reliability
If solid-state sources are used instead of magnetron, then the coherence and tunability are improved, but the device complexity increases
Solution Approach 1:
The solid-state sources enable precise control of operating parameters such as frequency, phase, and amplitude. This parameter control allows the system to adapt to different cooking requirements, cavity configurations, and load types, achieving superior coherence and tunability compared to fixed-frequency magnetrons.
4Measurement precision
If real-time monitoring of resonance shifts and efficiency is implemented, then the temperature detection precision is improved, but the measurement complexity increases
Solution Approach 1:
The system continuously monitors resonance shifts and forward/backward power at RF feeds, using this feedback to detect temperature changes and adjust heating parameters. This closed-loop control enables precise temperature detection and control while managing the complexity through systematic measurement approaches.
Solution Approach 2:
The system uses the cavity's own resonance characteristics as the measurement mechanism, eliminating the need for separate temperature sensors in the food. The resonance shifts of the cavity itself provide temperature information, allowing the system to self-monitor its thermal state.
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 enables precise control of heating patterns, ensuring even cooking and optimizing energy use by adjusting power levels based on real-time temperature and resonance data.
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 controller is configured to measure resonance shifts inside the cavity
Data Source
AI summary
An electromagnetic cooking device and method of controlling the same is provided herein. The cooking device has a cavity in which a liquid is placed and a plurality of RF feeds configured to introduce electromagnetic radiation into the cavity for heating the liquid. A controller is provided and is configured to: analyze forward and backward power at the plurality of RF feeds to calculate efficiency; determine and monitor a coefficient of variation of the efficiency; detect a specified temperature of the liquid based on changes in the coefficient of variation; and adjust a power level of the electromagnetic radiation in response to detection of the specified temperature.