Wireless Power Transmitter Flux Field Distortion Detection
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Solution Overview
Problem
Conventional wireless power transfer systems face inefficiencies due to misalignment and foreign objects, leading to reduced power transfer efficiency and potential component damage, as existing detection methods rely on unreliable temperature and power efficiency measurements.
Innovation Solution
Incorporating secondary sensing coils to detect distortions in the magnetic flux field, allowing for accurate detection of misalignment and foreign objects, and implementing control logic to adjust power transmission and notify users to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional temperature measurement methods are used to detect foreign objects, then the detection system is simple, but the detection accuracy is unreliable
Solution Approach 1:
The patent introduces secondary sensing coils as intermediary elements that indirectly detect the presence of foreign objects by measuring distortions in the magnetic flux field. These coils act as mediators between the primary transmit coil and the control logic, providing more accurate detection information without requiring direct contact or complex sensing mechanisms. The sensing coils convert magnetic field disturbances into electrical signals that can be processed by the control system.
Solution Approach 2:
The patent replaces conventional temperature-based detection (thermal method) with magnetic field-based detection using secondary sensing coils. This substitution transitions from measuring thermal effects (heat generation) to measuring magnetic flux distortions, providing more reliable and earlier detection of foreign objects before they cause overheating or damage.
2Productivity
If power transmission continues without accurate detection, then productivity is maintained, but harmful effects increase due to misalignment and foreign objects
Solution Approach 1:
The patent implements a feedback mechanism where secondary sensing coils continuously monitor the magnetic flux field during power transmission. When distortions indicating misalignment or foreign objects are detected, the control logic receives this information and adjusts or terminates power transmission accordingly. This closed-loop feedback system prevents harmful effects while maintaining productivity during normal operation.
Solution Approach 2:
The patent applies preliminary anti-action by detecting potential problems (misalignment or foreign objects) before they cause significant harm. The secondary sensing coils identify magnetic flux distortions early in the process, allowing the control logic to prevent or correct issues before excessive heat generation or component damage occurs, thereby protecting the system while maintaining efficiency.
3Measurement precision
If multiple secondary sensing coils are used to improve detection accuracy, then measurement precision increases, but device complexity increases
Solution Approach 1:
The patent divides the detection function into multiple secondary sensing coils positioned at different locations around the primary transmit coil. Each coil monitors a specific region of the magnetic flux field, and their combined measurements provide comprehensive and accurate detection of distortions. This segmentation allows precise localization and characterization of foreign objects or misalignment issues.
Solution Approach 2:
The secondary sensing coils serve multiple functions: they detect foreign objects, identify misalignment conditions, and provide information about the spatial distribution of magnetic flux distortions. This multi-functionality justifies the added complexity by providing comprehensive system monitoring and diagnostic capabilities from a single set of sensing elements.
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
Enhances wireless power transfer efficiency by accurately identifying and addressing misalignment and foreign objects, reducing heat and component damage, and improving user notification and corrective measures.
Implementation Method 1
Wireless power transmission using inductive coils is one method considered as an un-tethered method for transferring power wirelessly through a coupled wireless power signal. In wireless power transmission, power is transferred by transmitting a wireless power signal through a transmit coil.
Implementation Method 2
at least one secondary sensing coil configured to generate a signal responsive to a magnetic flux field generated during the wireless power transfer
Data Source
AI summary
A wireless power transmitter may include a transmit coil configured to generate a wireless power signal for wireless power transfer, at least one secondary sensing coil configured to generate a signal responsive to a magnetic flux field generated during the wireless power transfer, and control logic configured to detect at least one condition of a wireless power transfer system responsive to detecting distortion in the magnetic flux field from the at least one signal received from the secondary sensing coil. A related method may include generating with a wireless power transmitter a wireless power signal, generating with a plurality of secondary sensing coils one or more signals responsive to a magnetic flux field generated during the wireless power transfer, and detecting at least one condition of a wireless power transfer system responsive to the one or more signals generated by the plurality of secondary sensing coils.