Wireless Power Coil Structure for Free-Position Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional near-field wireless power transfer systems face challenges in maintaining optimal power transfer efficiency due to varying magnetic coupling between coils, requiring complex impedance matching circuits and struggling with free positioning and simultaneous charging of multiple devices.
Innovation Solution
A coil structure with uniform mutual inductance is achieved through a design featuring concentrically arranged coil parts with opposing current directions, allowing for efficient wireless power transfer without the need for adaptive impedance matching circuits, enabling free positioning and simultaneous charging of multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional resonant coils are used for wireless power transfer, then power can be transmitted wirelessly, but magnetic coupling varies with position and distance requiring complex impedance matching circuits
Solution Approach 1:
The transmitter coil is divided into multiple independent coil units arranged in an array. Each coil unit can be independently controlled to provide power to receivers at different positions. This segmentation allows the system to maintain uniform mutual inductance across different spatial locations without requiring complex adaptive impedance matching circuits.
Solution Approach 2:
The patent creates a universal coil structure where multiple coil units with identical designs work together to serve multiple functions: providing power to single or multiple receivers simultaneously, supporting free positioning, and maintaining consistent performance across different configurations without requiring position-specific circuit adjustments.
2Adaptability or versatility
If plate-type transmitter is used, then wireless power transmission can be provided, but optimal impedance matching must be realized depending on receiver position making free positioning difficult
Solution Approach 1:
The transmitter is segmented into multiple identical coil units that can independently serve different receivers. When multiple devices are charged simultaneously, each coil unit can be activated independently, providing position-independent impedance matching without requiring complex position-dependent circuit adjustments.
Solution Approach 2:
The system changes the operational parameters by activating different combinations of coil units based on receiver positions and power requirements. This allows the transmitter to adapt to multiple devices at different positions while maintaining consistent impedance characteristics through the uniform design of coil units rather than through complex matching circuits.
3Power
If mutual inductance varies for each position, then wireless power transfer can occur, but impedance matching to respective devices for different impedances becomes difficult
Solution Approach 1:
The patent maintains consistent electrical parameters across all coil units through uniform design. By changing the spatial configuration and activation pattern of identical coil units rather than altering their electrical characteristics, the system achieves position-independent impedance matching while maintaining efficient power transfer.
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 solution simplifies the system by reducing complexity and cost, allowing for uniform power transfer efficiency across different positions and supporting multiple devices with a single coil, while maintaining low system costs and efficient power delivery.
Implementation Method 1
transmitting, by a transmitting coil, power in a wireless manner by using an AC source; and receiving, by a receiving coil via magnetic coupling, the power in a wireless manner
Implementation Method 2
power transfer via magnetic coupling between the above-described Tx and Rx coils
Data Source
AI summary
The present invention relates to a near-field wireless power transfer system capable of having a constant efficiency regardless of a charging position of a receiver by only using a simple impedance matching circuit without using a separate existing complex adaptive impedance matching circuit or a control circuit, and simultaneously transmitting power without having difficulty with impedance matching even for wireless power transmission to a plurality of electronic devices by applying a structure having a uniform mutual inductance between a wireless power transmitter and a wireless power receiver.