Dynamic Energy Control for Uniform Microwave Heating
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Solution Overview
Problem
Microwave ovens often suffer from non-uniform heating due to standing waves, leading to hot and cold spots, and existing methods to improve uniformity, such as increasing modes within the cavity or using multiple frequencies, are inadequate as heating objects change their energy dissipation characteristics during the heating process.
Innovation Solution
A method and apparatus that dynamically adjust the transmission time and power for each frequency based on real-time dissipation information, ensuring a desired energy dissipation pattern across various frequencies to achieve uniform energy distribution within the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple frequencies are used to improve uniformity, then heating uniformity is improved, but energy transfer efficiency decreases
Solution Approach 1:
The system dynamically adjusts the frequency spectrum based on real-time feedback from temperature sensors and dissipation measurements. The frequency distribution is not fixed but adapts continuously to maintain optimal energy transfer efficiency while achieving uniform heating, resolving the contradiction between using multiple frequencies for uniformity and energy efficiency
Solution Approach 2:
The system incorporates real-time feedback mechanisms that monitor temperature distribution and energy dissipation characteristics. This feedback is used to adjust the frequency spectrum dynamically, allowing the system to identify and transmit only at frequencies with high dissipation ratios, thereby maintaining both heating uniformity and energy transfer efficiency
2Stability of the object's composition
If mode stirring is used to improve uniformity, then heating uniformity is improved, but device complexity increases
Solution Approach 1:
The invention replaces mechanical mode stirring mechanisms with an electromagnetic field-based solution. By dynamically adjusting the frequency spectrum and phase relationships of multiple feeds, the system achieves mode stirring effects through electromagnetic control rather than mechanical movement, thereby improving heating uniformity without increasing mechanical device complexity
Solution Approach 2:
The system changes electromagnetic parameters (frequency, phase, amplitude) of the feeds dynamically to achieve mode stirring effects. Instead of mechanically moving components, the invention varies the operational parameters of the electromagnetic field to create different standing wave patterns, achieving heating uniformity without mechanical complexity
3Loss of energy
If frequency switching is performed to match changing dissipation characteristics, then energy transfer efficiency is improved, but processing time increases
Solution Approach 1:
The system performs frequency switching continuously and dynamically during the heating process without interrupting the overall heating action. Multiple frequencies are transmitted in a coordinated manner, and the transition between frequencies is seamless, maintaining continuous energy transfer to the load while adapting to changing dissipation characteristics, thus avoiding time loss
4Productivity
If high power is transmitted to maximize energy transfer, then productivity is improved, but harmful factors increase
Solution Approach 1:
The system applies different power levels at different frequencies based on the local dissipation characteristics of the load. By analyzing the dissipation ratio at each frequency and applying appropriate power levels selectively, the system ensures that high power is transmitted only at frequencies where the load can efficiently dissipate energy, preventing localized overheating and damage while maintaining overall heating productivity
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 reduces overall processing time, maximizes energy transfer efficiency, and maintains uniform energy dissipation across the load without causing damage, even when the load's dissipation characteristics change during heating.
Implementation Method 1
Heating objects using high frequency radiation is wide spread, and comprises the commonly used domestic microwave (MW) oven
Implementation Method 2
a lack of uniformity in heating, which often results in hot spots and cold spots that reflect the standing wave within the cavity
Implementation Method 3
measuring a resulting reflected and coupled spectrum
Implementation Method 4
measuring a resulting reflected and coupled spectrum
Data Source
Figure 1A~1B
Figure 1C
Figure 2
AI summary
Apparatuses and methods for applying EM energy to a load. The apparatuses and methods may include at least one processor configured to receive information indicative of energy dissipated by the load for each of a plurality of modulation space elements. The processor may also be configured to associate each of the plurality of modulation space elements with a corresponding time duration of power application, based on the received information. The processor may be further configured to regulate energy applied to the load such that for each of the plurality of modulation space elements, power is applied to the load at the corresponding time duration of power application.