Wireless Charging Coil Position Detection via Dynamic Excitation
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Solution Overview
Problem
Conventional non-contact power supply systems for vehicles cannot accurately determine the position of the power receiving coil relative to the power feeding coil, leading to potential adverse effects on surroundings due to magnetic fluxes generated during the power transfer process.
Innovation Solution
A method and system where the excitation voltage and frequency of the power feeding coil are adjusted based on the position of the power receiving coil, allowing for precise detection of the coil position through changes in received voltage, thereby minimizing the impact of magnetic fluxes on the surroundings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power feeding coil is excited with high power to ensure reliable power transfer, then the power transfer reliability is improved, but the adverse effect of magnetic fluxes on the surroundings increases
Solution Approach 1:
The patent applies dynamics by making the excitation power of the power feeding coil variable rather than fixed. The control device adjusts the excitation power dynamically based on the detected position of the power receiving coil, increasing power when the coil is in the optimal charging position and decreasing power when the coil is mispositioned, thereby resolving the contradiction between reliable power transfer and reducing magnetic flux adverse effects
Solution Approach 2:
The patent implements feedback by using the power receiving coil to detect the position of the power feeding coil and feed this information back to the control device. The control device then adjusts the excitation power accordingly, creating a closed-loop control system that ensures reliable power transfer only when properly positioned while minimizing adverse magnetic flux effects during positioning
2Object-generated harmful factors
If the excitation power is reduced to minimize magnetic flux adverse effects, then the harmful factors are reduced, but the power transfer reliability deteriorates
Solution Approach 1:
The system dynamically adjusts excitation power based on real-time position detection. When the power receiving coil is detected to be in the correct position for power transfer, the excitation power is increased to ensure reliable charging. When the coil is mispositioned, power is reduced to minimize magnetic flux adverse effects, thus resolving the contradiction
3Ease of operation
If conventional camera-based guidance is used for parking assistance, then the ease of operation is improved, but the ability to detect magnetic flux interlinkage is lost
Solution Approach 1:
The patent replaces the mechanical/optical camera-based detection system with an electromagnetic detection system. The power receiving coil detects the position of the power feeding coil through electromagnetic coupling, providing precise measurement of magnetic flux interlinkage and coil positioning, thereby resolving the contradiction between ease of operation and measurement precision
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 enables accurate detection of the power receiving coil position without requiring high-accuracy detection devices, reducing adverse effects on the surroundings while ensuring reliable power transfer.
Implementation Method 1
a power feeding coil 12 that feeds power to a power receiving coil 22 in a contactless manner
Implementation Method 2
the position of the power receiving coil 22 is detected based on a received voltage with the power receiving coil 22 when the power feeding coil 12 is excited
Data Source
AI summary
The invention provides a non-contact power supply system which supplies power from a power feeding coil on a ground side to a power receiving coil on a vehicle side, and provides a coil position detecting method of detecting a position of a power receiving coil. An excitation voltage and an excitation frequency for the power feeding coil are changed depending on the position of the power receiving coil relative to the power feeding coil. Then, the position of the power receiving coil is detected based on a received voltage with the power receiving coil when the power feeding coil is excited.