Tx Coil Impedance Sensing for Multi-Rx Wireless Power Positioning
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Solution Overview
Problem
Existing methods for determining the position of receiving coils in wireless power transmission require additional hardware and communication between the transmitter and receiver, increasing complexity and cost, and are inefficient when the receiver coil is at an arbitrary location without fixed positioning.
Innovation Solution
A method that calculates the current flowing through transmitting coils by measuring impedance, identifies the presence of receiving coils based on current changes, calculates a correlation value using voltage and current vectors, and determines the position of receiving coils without communication, allowing for wireless power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional hardware is installed to calculate mutual inductance through measurement, then the position determination accuracy is improved, but the device complexity and cost increase
Solution Approach 1:
The patent extracts the position determination function from the receiver device and implements it entirely in the transmitter device by analyzing impedance changes of the transmitting coil. This eliminates the need for additional position detection hardware in the receiver while maintaining accurate position determination capability.
Solution Approach 2:
The transmitting coil serves multiple functions: it simultaneously performs wireless power transmission and position detection. By measuring impedance changes of the same coil used for power transmission, the system determines receiver position without requiring separate dedicated detection hardware.
2Measurement precision
If mutual communication is implemented to exchange position information, then the position determination accuracy is improved, but the device complexity increases
Solution Approach 1:
The transmitter device determines the receiver position autonomously by monitoring its own impedance changes. The system serves itself by using the natural electromagnetic coupling effect between coils to generate detectable impedance variations, eliminating the need for separate communication protocols or data exchange mechanisms.
3Measurement precision
If measurement method is used to calculate mutual inductance, then the position determination accuracy is improved, but additional hardware and communication are required increasing system complexity
Solution Approach 1:
The patent replaces physical measurement hardware with an electrical measurement approach. Instead of using mechanical position sensors or dedicated measurement circuits, the system uses electrical impedance measurement of the transmitting coil to infer position information, simplifying the hardware architecture.
4Adaptability or versatility
If the receiving coil position is not fixed, then the adaptability is improved, but the difficulty of determining mutual inductance increases
Solution Approach 1:
The system dynamically adapts to changing receiver positions by continuously monitoring impedance changes of the transmitting coil. As the receiver moves to arbitrary positions, the system detects the resulting impedance variations and recalculates the optimal transmitting coil configuration in real-time, maintaining effective power transmission throughout the movement range.
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 wireless power transmission to multiple receiving coils by determining their positions using only the transmitting coil, reducing system complexity and cost, and allowing for real-time detection and power control without additional hardware.
Implementation Method 1
wireless power transmission technology
Implementation Method 2
calculating a current value flowing through one or more transmitting (Tx) coils by measuring an impedance value of the one or more Tx coils; identifying whether a receiving (Rx) coil associated with the one or more Tx coils exists, based on a change in the current value
Data Source
AI summary
The present invention relates to a method and apparatus for performing position estimation of multiple receiving coil and wireless power transmission. A method for performing wireless power transmission according to an embodiment of the present disclosure may comprise: calculating a current value flowing through one or more transmitting (Tx) coils by measuring an impedance value of the one or more Tx coils; identifying whether a receiving (Rx) coil associated with the one or more Tx coils exists; when one or more Rx coils exist, calculating a correlation value between a Tx coil and a Rx coil for each of the one or more Rx coils; determining a position of the one or more Rx coils; and performing wireless power transmission to the one or more Rx coils.