Primary Coil Resonance for Contactless Power and Metal Detection
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Solution Overview
Problem
Contactless power transmission devices have complex and enlarged structures due to the need for both primary and detection coils, leading to reduced positioning accuracy and efficiency in metal detection and power supply, with existing solutions suffering from interference between adjacent power supplying areas.
Innovation Solution
A method and device using a primary coil and capacitor to selectively excite at first and second resonance frequencies for metal detection and power supply, allowing for accurate detection and efficient power transfer without the need for a separate detection coil, by determining the presence of metal or instruments based on primary current changes at specific resonance frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both primary coil and detection coil are used in contactless power transmission device, then metal detection function is provided, but device structure becomes complicated and enlarged
Solution Approach 1:
The patent combines the detection coil and primary coil into a single integrated coil structure. The same coil serves both as the detection coil for detecting metal objects and as the primary coil for contactless power transmission, eliminating the need for separate coils and simplifying the device structure.
Solution Approach 2:
The coil is designed to perform multiple functions: it acts as both a detection coil for metal detection and a primary coil for power transmission. This multi-functional design reduces the number of components needed and simplifies the overall device architecture.
2Reliability
If both primary coil and detection coil are used, then metal detection is possible, but positioning accuracy between coils becomes difficult to maintain
Solution Approach 1:
By merging the detection coil and primary coil into a single coil, the patent eliminates the positioning accuracy issues that arise from maintaining precise spacing and alignment between two separate coils. The integrated design removes the need for complex positioning mechanisms and reduces assembly complexity.
3Adaptability or versatility
If multiple separate power supplying areas with primary and detection coils are provided, then power supply to multiple instruments is enabled, but structure becomes further complicated and enlarged
Solution Approach 1:
The patent divides the contactless power transmission device into multiple independent power supplying areas, where each area contains an integrated coil that can independently detect metal objects and provide power to instruments. This segmentation allows multiple instruments to be powered simultaneously while keeping each module compact and manageable.
Solution Approach 2:
Each power supplying area uses an integrated coil that combines detection and power transmission functions, preventing the structure from becoming overly complicated despite having multiple power supplying areas.
4Adaptability or versatility
If multiple power supplying areas are provided, then multiple instruments can be powered, but magnetic flux interference from adjacent areas increases
Solution Approach 1:
By segmenting the device into separate power supplying areas with integrated coils, the patent isolates the magnetic flux generation to specific regions. Each integrated coil's magnetic flux is confined to its designated power supplying area, reducing interference with adjacent areas compared to separate coil configurations.
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 simplifies the structure, increases detection accuracy, and enhances power supply efficiency while reducing device size, minimizing interference between adjacent power supplying areas.
Implementation Method 1
excites the primary coil located in the power supplying area and produces electromagnetic induction at a secondary coil of a power receiving device arranged in the electric instrument to supply power to the electric instrument
Implementation Method 2
excites the primary coil selectively using a first resonance frequency, which is in the proximity of a frequency determined by the primary coil and the capacitor located in the primary side circuit, and a second resonance frequency, which is in the proximity of a frequency determined by an inductance component and a capacitance component of the electric instrument
Data Source
AI summary
A primary coil (L1) is excited by selectively using: a first resonance frequency (AL) near a frequency determined by the primary coil (L1) and a primary-side capacitor (C), said primary coil (L1) being placed in a power-supply area (AR); and a second resonance frequency (BL) near a frequency determined by a secondary-side inductance component and a secondary-side capacitance component, said components existing when the primary coil (L1) faces a secondary coil (L2).