Solid-State RF Cooking Device Uniform Heating Control
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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 food, as they lack the ability to precisely control and tune the resonant modes within the cooking cavity.
Innovation Solution
The use of a solid-state RF cooking device with multiple coherent RF feeds that can independently control frequency, phase, and amplitude, allowing for precise control of electromagnetic radiation patterns within the enclosed cavity to achieve uniform heating by identifying and adjusting power levels based on real-time measurements and thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a magnetron-based microwave source is used, then the device can generate microwave frequency radiation, but the heating becomes non-uniform due to a single, non-coherent source
Solution Approach 1:
The patent divides the single magnetron source into multiple solid-state amplifier sources (at least two amplifiers) that can be independently controlled. Each amplifier generates coherent microwave radiation that can be precisely adjusted in phase, frequency, and amplitude to create uniform heating patterns throughout the cavity, resolving the non-uniform heating problem while maintaining power generation capability.
Solution Approach 2:
The patent combines multiple solid-state amplifier sources to work together as a unified system. By merging the outputs of multiple coherent sources with independent control capabilities, the system achieves both the power generation of a single source and the heating uniformity of multiple coordinated sources.
2Device complexity
If a single non-coherent source is used, then the device structure is simpler, but the resonant modes cannot be precisely controlled
Solution Approach 1:
The patent implements dynamic control of multiple solid-state amplifier sources, allowing real-time adjustment of phase, frequency, and amplitude for each source. This dynamic capability enables precise control over resonant modes and electromagnetic field distribution, transforming the system from static to adaptable while maintaining manageable complexity through integrated control.
Solution Approach 2:
The patent changes the controllable parameters of the microwave sources from fixed (magnetron) to variable (solid-state amplifiers). Each amplifier can independently adjust frequency, phase, and amplitude parameters, enabling precise resonant mode control and adaptation to different cooking requirements without overwhelming system complexity.
3Manufacturing precision
If multiple solid-state amplifiers are used, then the heating uniformity improves, but the device complexity increases
Solution Approach 1:
The patent designs the control system to serve multiple functions simultaneously: it controls phase, frequency, and amplitude of each amplifier; monitors cavity conditions; adjusts resonant modes; and optimizes heating patterns. This multi-functionality reduces the need for separate dedicated components, managing overall complexity while achieving superior heating uniformity through coordinated multi-source operation.
4Productivity
If high power is delivered continuously, then the cooking efficiency is high, but overheating can damage the cooking device
Solution Approach 1:
The patent implements periodic monitoring and adjustment of power delivery to multiple solid-state amplifiers. The system continuously monitors cavity conditions and dynamically adjusts the phase, frequency, and amplitude of each source in periodic cycles, enabling high cooking efficiency through optimized power delivery while preventing overheating and device damage through real-time control adjustments.
Solution Approach 2:
The patent incorporates feedback control where the system monitors the actual heating效果和cavity conditions, then adjusts the power levels and phase relationships of the multiple amplifiers accordingly. This closed-loop feedback mechanism maintains high cooking efficiency by optimizing power delivery while preventing overheating and device damage through automatic power reduction when thresholds are exceeded.
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 approach enables more even and controlled heating patterns, improving cooking efficiency and preventing overheating, which can damage the cooking device, by dynamically adjusting power levels and phase shifts to match the specific characteristics of the food load.
Implementation Method 1
at least one amplifier is configured amplify an RF signal thereby supplying the RF feed to the at least one waveguide
Implementation Method 2
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.
Data Source
AI summary
A method for controlling a power of an electromagnetic cooking device is shown. The method includes controlling a power supply to deliver a power level to the amplifier and monitoring at least one RF feed delivered to an enclosed cavity. The method further includes identifying an output power based on the RF feed and comparing the output power to a maximum power. A power difference of the output power compared to a target power is determined, and the power difference is compared to a plurality of difference thresholds. Based on the comparison, the power level is adjusted by a plurality of power adjustment magnitudes.