Wireless Power Coil Positioning for Accurate Foreign Object Detection
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Solution Overview
Problem
Existing wireless power transmission systems, conforming to the WPC standard, face challenges in accurately detecting foreign objects, which can lead to reduced control accuracy and potential issues in power transmission/reception.
Innovation Solution
A power receiving apparatus is designed to transmit information related to the positional relationship between the power transmitting coil and the power receiving coil to the power transmitting apparatus, enabling more accurate foreign object detection by associating physical quantities such as Q factor, resonant frequency, and coupling coefficient with positional information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If foreign object detection is performed using conventional methods (Q factor, resonant frequency) in wireless power transmission systems, then power transmission control can be achieved, but detection accuracy is reduced and positional variations cannot be distinguished from foreign object presence
Solution Approach 1:
The patent introduces positional information as an intermediary parameter that mediates between the detection signals (Q factor, resonant frequency) and the determination of foreign object presence. By comparing detected values against position-dependent reference values, the system can distinguish whether changes are due to positional variations or actual foreign object presence, thereby improving detection accuracy while maintaining control reliability
Solution Approach 2:
The patent changes the detection approach by incorporating positional information as an additional parameter. Instead of relying solely on Q factor and resonant frequency, the system now uses a combination of these parameters along with positional data to make determination decisions. This multi-parameter approach resolves the contradiction by providing context that improves accuracy without sacrificing reliability
2Measurement precision
If the power receiving apparatus transmits additional positional information to the power transmitting apparatus, then foreign object detection accuracy is improved, but communication data volume and processing complexity increase
Solution Approach 1:
The patent makes the communication system multi-functional by using the existing communication channel between power transmitting and receiving apparatuses not only for power transmission control but also for exchanging positional information. This approach improves detection accuracy without requiring separate dedicated communication channels or additional hardware, thereby limiting the increase in overall system 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
This approach enhances the accuracy of foreign object detection, improving the reliability of wireless power transmission systems by better distinguishing between positional variations and the presence of foreign objects.
Implementation Method 1
a power receiving unit configured to wirelessly receiving power from a power transmitting apparatus via a power receiving coil
Data Source
AI summary
A power receiving apparatus wirelessly receiving power from a power transmitting apparatus via a power receiving coil, and transmit, to the power transmitting apparatus, information related on a positional relationship between a power transmitting coil in the power transmitting apparatus and the power receiving coil.