Wireless Power Transfer Alignment via Induced Voltage Feedback
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Solution Overview
Problem
Conventional wireless charging systems face challenges in accurately aligning transmission and receiving coils for efficient power transfer, particularly when the receiving side has significant size and weight, and existing methods like using magnets can cause interference.
Innovation Solution
A wireless power transfer system that includes a transmission coil and a receiving coil with a controller to detect induced voltage variations, issuing an indication signal for optimal alignment, and a vector computation circuit to provide directional movement suggestions for better power transfer positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an identifiable mark is provided on the charger plate for alignment, then the alignment process is simplified, but the mark may not be precisely aligned to the center of the transmission coil during assembly
Solution Approach 1:
The system continuously monitors the induced voltage in the receiving coil and provides real-time feedback through indication signals. When the receiving coil is misaligned, the system detects voltage variations and guides the user to adjust the position until optimal alignment is achieved, thereby resolving the precision issue of static marks
Solution Approach 2:
The system automatically detects alignment status through voltage sensing and provides self-correction guidance without requiring external tools or complex marking systems. The receiving device itself performs the alignment detection and guides the user through indication signals
2Ease of operation
If a magnet is added at the power transmission side to attract ferromagnetic material, then alignment is assisted, but the magnet may cause interference to the power receiving side
Solution Approach 1:
The patent replaces the mechanical magnetic attraction system with an electrical sensing system. Instead of using magnets to physically guide alignment, the system uses voltage sensing and electronic indication signals to guide the user to the correct position, eliminating magnetic interference while maintaining alignment assistance
Solution Approach 2:
The system introduces an intermediary sensing mechanism that detects alignment status through induced voltage measurements. This intermediary electrical field-based detection method replaces direct magnetic interaction, providing alignment guidance without the harmful effects of strong magnetic fields on the receiving device
3Power
If the receiving coil is made larger to improve power reception, then the power receiving capability is enhanced, but the weight and size increase making alignment more difficult
Solution Approach 1:
The system provides real-time feedback through indication signals that show whether the receiving coil is properly aligned. This feedback mechanism allows users to easily adjust larger, heavier devices until the optimal position is reached, counteracting the increased alignment difficulty caused by larger size and weight
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
Enables efficient power transfer by accurately determining optimal alignment positions, reducing alignment difficulties and interference issues, and ensuring stable power delivery.
Implementation Method 1
a receiving coil for receiving the power from the transmission coil by electromagnetic interaction, to generate an induced voltage
Data Source
AI summary
The present invention discloses a wireless power transfer system having positioning function, and a positioning device and a method therefor. In the positioning method, a power transmission side keeps generating a stable power; a power receiving side is moved relatively to the power transmission side and generates a corresponding induced voltage. An indication signal related to the induced voltage is generated by detecting the induced voltage, and the indication signal provides a suggestion to a user as to how the power receiving side should be moved relatively to the power transmission side to be closer to an optimal power transfer position.