RF Cooking System Phase Control for Uniform Heating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional microwave ovens using a single, non-coherent magnetron source for electromagnetic cooking result in non-uniform heating of food due to the lack of control over electromagnetic energy distribution within the cooking cavity.
Innovation Solution
A solid-state radio frequency (RF) cooking system with multiple RF feeds, each configured with a compensation component and a phase-locked loop component, allows for precise control of phase differences and generation of phase-shifted signals to maintain coherence and achieve uniform heating by shaping electromagnetic wave patterns within the cooking cavity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single magnetron source is used for microwave generation, then the device complexity is reduced, but the heating uniformity deteriorates
Solution Approach 1:
The patent divides the single magnetron source into multiple separate magnetron sources (first magnetron and second magnetron), each generating microwave signals that are independently controlled. This segmentation allows for better distribution of electromagnetic energy throughout the cooking cavity, improving heating uniformity while managing device complexity through modular architecture
Solution Approach 2:
The patent combines multiple magnetron sources with a phase-locked loop system to create a coherent multi-source microwave generation system. The phase-locked loop synchronizes the multiple magnetrons, allowing their outputs to be combined constructively, achieving uniform heating through coordinated operation of multiple sources
2Manufacturing precision
If mechanical solutions like microwave stirrer and turntable are added, then heating uniformity is improved, but device complexity increases
Solution Approach 1:
The patent replaces mechanical stirring and rotating mechanisms with an electronic phase-locked loop system that controls the phase of microwave signals from multiple magnetrons. This substitution eliminates moving mechanical parts while achieving heating uniformity through electronic phase coordination, reducing device complexity while maintaining heating quality
Solution Approach 2:
The patent introduces dynamic phase control through the phase-locked loop system, which can adjust the phase of microwave signals from different magnetrons in real-time. This dynamic electronic control provides flexibility in achieving uniform heating without the mechanical complexity of physical stirrers and turntables
3Manufacturing precision
If solid-state RF sources with phase control are used, then heating uniformity is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the operating parameters of multiple magnetron sources by controlling their phase relationships through a phase-locked loop system. By adjusting the phase parameter of each magnetron's output, the system achieves coherent addition of microwave energy, improving heating uniformity while using conventional magnetron technology rather than more complex solid-state sources
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 system ensures coherent control of electromagnetic energy distribution, leading to more uniform and efficient heating of food by creating constructive or destructive interference patterns, maximizing the coupling of RF power with the food and minimizing energy wastage.
Implementation Method 1
The phase-locked loop component can be configured to generate a phase-shifted signal wherein the phase shift is based on at least the reference signal compensation offset value
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
Implementation Method 3
The compensation component can be configured to determine a phase difference between at least a subset of the reference signals; compare the phase difference with a predetermined reference phase difference
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An electromagnetic energy delivery system includes a set of radio frequency channels; each channel configured to receive a set of reference signals. Each channel further includes a compensation component and a phase-locked loop component. The compensation component can be configured to determine a phase difference between at least a subset of the reference signals; compare the phase difference with a predetermined reference phase difference; and determine a reference signal compensation offset value based on the comparison of the phase difference and the predetermined reference phase difference. The phase-locked loop component can be configured to generate a phase-shifted signal wherein the phase shift is based on at least the reference signal compensation offset value.