Dynamic Impedance Matching for Electromagnetic Wave Heating
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Solution Overview
Problem
Existing electromagnetic wave systems for thawing food face challenges in efficiently matching different loads due to varying dielectric coefficients of foods with different attributes and temperature changes, leading to fluctuating electromagnetic wave absorption rates.
Innovation Solution
An electromagnetic wave generating system with a matching unit comprising series-connected fixed value inductors and parallel branches with switches, along with a detection and control unit to adjust load impedance and optimize wave absorption, is integrated into a heating device to improve matching accuracy and absorption efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electromagnetic wave generating system is used for thawing food, then the system can provide basic heating function, but the electromagnetic wave absorption rate fluctuates due to varying dielectric coefficients of different foods and temperature changes
Solution Approach 1:
The patent implements a dynamic impedance matching system that automatically adjusts matching parameters in real-time based on detected electromagnetic wave absorption characteristics. The system transitions from static fixed components to dynamic adjustable components including variable inductors and variable capacitors, enabling continuous adaptation to different food loads and temperature conditions, thereby resolving the contradiction between reliability and adaptability
Solution Approach 2:
The patent changes the electrical parameters (inductance and capacitance values) of the impedance matching circuit components dynamically. By using variable inductors and variable capacitors instead of fixed values, the system can adjust the impedance matching parameters according to the dielectric coefficient variations of different foods during thawing, maintaining stable electromagnetic wave absorption rate across different loads
2Adaptability or versatility
If variable capacitors or inductors are used to adjust load impedance, then the matching range can be improved, but the system complexity and response time increase
Solution Approach 1:
The patent replaces mechanical adjustment mechanisms (such as mechanical variable capacitors or inductors requiring manual or motor-driven adjustment) with electronically controlled components. The impedance matching is achieved through electronic control of variable capacitors and inductors, which can be adjusted rapidly via control signals without mechanical moving parts, thereby reducing system complexity while maintaining wide matching range
Solution Approach 2:
The patent implements a feedback control mechanism where the system detects the electromagnetic wave absorption rate or impedance state and automatically adjusts the variable capacitors and inductors to maintain optimal matching. This closed-loop feedback system simplifies the overall control structure by using intelligent automation rather than complex manual adjustment mechanisms, achieving wide matching range with reduced operational complexity
3Adaptability or versatility
If mechanical motor structures are used for impedance adjustment, then the system can adapt to different loads, but the response speed is slow and reliability is reduced
Solution Approach 1:
The patent replaces mechanical motor structures with solid-state electronic components for impedance adjustment. Variable capacitors and inductors controlled by electronic circuits can change their electrical parameters instantaneously or near-instantaneously in response to control signals, eliminating the mechanical inertia and response delays associated with motor-driven adjustments, thereby achieving both adaptability and fast response speed
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 achieves higher reliability, faster response, and wider adjusting range compared to mechanical motor structures and variable capacitors/inductors, ensuring efficient electromagnetic wave absorption across various food loads and temperature changes.
Implementation Method 1
the radiating units are electrically connected with the electromagnetic generating module to generate electromagnetic waves of a corresponding frequency according to the electromagnetic wave signal
Implementation Method 2
the absorption rate of electromagnetic waves by the foods fluctuates up and down
Data Source
AI summary
Disclosed are an electromagnetic wave generating system and a heating device. The electromagnetic wave generating system includes an electromagnetic generating module, a radiating assembly and a matching unit connected in series between the electromagnetic generating module and the radiating assembly. The electromagnetic generating module is configured to generate an electromagnetic wave signal. The radiating assembly includes one or more radiating units and is configured to be electrically connected with the electromagnetic generating module to generate electromagnetic waves of a corresponding frequency according to the electromagnetic wave signal. The matching unit includes a first matching module. The first matching module includes a plurality of fixed value inductors connected in series between the electromagnetic generating module and the radiating assembly, and a plurality of parallel branches, wherein each parallel branch of the first matching module includes a fixed value capacitor and a switch connected in series. The input ends of the plurality of parallel branches of the first matching module are respectively connected in series between two adjacent inductors and between an end inductor and the radiating assembly, and the output ends thereof are all configured to be grounded, so as to match a load more accurately after receiving an adjusting command.