Microwave Heating Chamber Control Using Reflected Power Feedback
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Solution Overview
Problem
Existing heating technologies using high-frequency waves lack effective methods to detect and control the state of a heating target, such as defrosting or expansion, leading to inefficiencies in the heating process.
Innovation Solution
A high-frequency treatment device that includes a heating chamber, high-frequency power generator, feeder, detector, controller, and storage, which uses a frequency sweep to generate high-frequency power at multiple frequencies, detects microwave power changes, and controls heating based on temporal changes in reflection ratio and microwave power difference to accurately monitor and adjust the heating process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing heating technologies use high-frequency waves to heat targets, then heating function is achieved, but effective detection and control of heating target state (defrosting, expansion) is lacking
Solution Approach 1:
The patent implements feedback control by detecting reflected microwave power and calculating reflection ratio, then using this information to control the heating process. The detector measures reflected microwave power, the controller calculates reflection ratio, and adjusts heating based on this feedback to accurately detect defrosting and expansion states while maintaining heating efficiency.
Solution Approach 2:
The patent changes the parameter of microwave frequency by causing the power generator to repeatedly generate high-frequency power having a plurality of frequencies. This frequency parameter change enables accurate detection of heating target state through temporal changes in reflection ratio at different frequencies, resolving the contradiction between detection precision and heating efficiency.
2Measurement precision
If existing methods detect defrosting and expansion of heating target, then some state information is obtained, but detection effectiveness is insufficient
Solution Approach 1:
The patent introduces reflection ratio as an intermediary parameter to detect heating target state. Instead of directly detecting defrosting or expansion, the system measures reflected microwave power, calculates reflection ratio, and uses this intermediary metric to infer target state changes, achieving effective detection without complex direct measurement systems.
Solution Approach 2:
The patent replaces potential mechanical or complex sensor-based detection systems with an electromagnetic field-based detection method. By measuring reflected microwave power and calculating reflection ratio, the system substitutes complex mechanical detection with simpler electromagnetic measurement, achieving effective detection of defrosting and expansion while reducing device complexity.
3Measurement precision
If high-frequency power is generated at multiple frequencies repeatedly, then accurate detection of heating state is achieved, but energy consumption increases
Solution Approach 1:
The patent applies periodic action by causing the power generator to repeatedly generate high-frequency power having a plurality of frequencies in sequence. This periodic frequency sweeping allows accurate detection of heating target state through temporal changes in reflection ratio, while the repeated cycles enable efficient energy use by systematically cycling through frequencies rather than continuously operating at all frequencies simultaneously.
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
Enables precise control of heating, allowing for accurate detection of defrosting and expansion of the heating target, thereby improving the efficiency and effectiveness of the heating process.
Implementation Method 1
a high-frequency power generator that generates high-frequency power having a frequency in a predetermined frequency band
Implementation Method 2
a detector that detects incident microwave power and reflected microwave power
Data Source
AI summary
This high-frequency treatment device includes: a heating chamber configured to accommodate a heating target; a high-frequency power generator; a feeder; a detector; a controller; and a storage. The high-frequency power generator generates high-frequency power having a frequency in a predetermined frequency band. The feeder supplies incident microwave power corresponding to the high-frequency power to the heating chamber. The detector detects at least one of the incident microwave power and reflected microwave power that is included in the incident microwave power and returns from the heating chamber to the feeder. The controller controls heating of the heating target by controlling the high-frequency power generator. The storage stores, together with time elapsed from the start of heating, information detected by the detector. The controller causes the high-frequency power generator to repeatedly generate, on a per frequency basis, the high-frequency power having a plurality of frequencies for the heating. The controller properly controls heating of the heating target on the basis of a temporal change in one of the reflected microwave power, a reflection ratio, and a microwave power difference.