Wireless power transmission apparatus for induction heating and control method thereof
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Solution Overview
Problem
Existing wireless power transmission systems for small home appliances face challenges in efficiently aligning reception and working coils, leading to reduced power transmission efficiency and safety concerns due to potential foreign object interference.
Innovation Solution
A wireless power transmission apparatus with a working coil that can change operation modes, an inverter for outputting current at varying frequencies, and a controller that calculates the eccentricity degree between the working coil and the reception coil, allowing for frequency adjustments during wireless power transmission to compensate for misalignment and foreign objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the working coil and reception coil are not aligned properly, then the device is easier to operate without precise positioning, but power transmission efficiency is remarkably lowered
Solution Approach 1:
The system continuously monitors the alignment state between transmission and reception coils by detecting changes in inductance and impedance, then provides real-time feedback to the user through visual or audible signals to guide proper positioning, ensuring high power transmission efficiency without requiring precise manual alignment
Solution Approach 2:
The system automatically detects and compensates for misalignment by adjusting the operating frequency and power transmission parameters based on real-time coupling conditions, enabling the system to self-optimize performance without user intervention while maintaining ease of operation
2Manufacturing precision
If a magnetic component is added to the reception side for automatic alignment, then alignment accuracy is improved, but the risk of ignition or fuming due to foreign objects increases
Solution Approach 1:
The system performs foreign object detection before initiating power transmission by measuring the baseline inductance and impedance of the reception coil, and continuously monitors these parameters during operation to detect any metallic objects that may be attracted to the magnetic field, providing warnings or shutting down to prevent ignition or fuming
Solution Approach 2:
The system dynamically adjusts the magnetic field strength and operating frequency based on detected conditions, reducing the magnetic field intensity when foreign objects are detected to minimize the risk of ignition or fuming while maintaining sufficient alignment accuracy through controlled magnetic attraction
3Loss of energy
If the operation frequency is changed to compensate for eccentricity, then power transmission efficiency is improved, but the device complexity increases
Solution Approach 1:
The system employs a dynamic frequency adjustment mechanism that automatically modifies the operating frequency based on real-time detection of coil alignment and coupling conditions, allowing the system to adapt to varying eccentricity levels and maintain optimal power transmission efficiency without requiring complex mechanical adjustment mechanisms
Solution Approach 2:
The system replaces complex mechanical alignment mechanisms with electronic frequency modulation and control, using software-based algorithms to calculate and adjust the optimal operating frequency based on measured electrical parameters, thereby improving power transmission efficiency while minimizing additional hardware complexity
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 enhances power transmission efficiency by dynamically adjusting operation frequencies based on calculated eccentricity, reduces the risk of foreign object interference, and improves user convenience by providing real-time alignment feedback.
Implementation Method 1
a general electron induction heating device allows high-frequency current to flow in a working coil or heating coil installed therein. When the high-frequency current flows in the working coil or the heating coil, a strong line of magnetic force is generated. The line of magnetic force generated in the working coil or the heating coil forms eddy current while being transmitted through a cooking tool. Thus, as eddy current flows in a cooking tool, heat is generated to heat a container itself
Implementation Method 2
The line of magnetic force generated in the working coil or the heating coil forms eddy current while being transmitted through a cooking tool. Thus, as eddy current flows in a cooking tool, heat is generated
Implementation Method 3
when alternating current (AC) flows into a transmission coil, a battery is charged by forming a magnetic field around the transmission coil, allowing AC to flow in a reception coil due to influence of the magnetic field
Data Source
AI summary
A wireless power transmission apparatus for induction heating includes: a working coil configured to change operation based on selection of a mode of operation from among a plurality of operating modes, the plurality of operating modes including a wireless power transmission mode configured to wirelessly transmit power and a heating mode configured to heat one or more objects, an inverter configured to output, to the working coil, current at an operation frequency, and a controller. The controller is configured to calculate an eccentricity degree between the working coil and a reception coil of a target object, and control, in the wireless power transmission mode, the operation frequency based on the calculated eccentricity degree while performing wireless power transmission to the target object.