Concentric Wireless Power Coil for Misalignment Stability
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Solution Overview
Problem
The existing wireless power transmission systems face challenges due to size imbalances between the power transmitting coil and the power receiving coil, leading to inefficient power transfer and reduced communication stability, especially when the power receiving apparatus is not positioned accurately on the power transmitting coil.
Innovation Solution
A power transmitting coil design featuring at least one first coil with a current flowing in a first direction and a second coil on its outer side with a current flowing in an opposite direction, allowing for optimal power transmission regardless of the power receiving coil's position, achieved through a concentric arrangement and series connection of the coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the power transmitting coil is made larger to cover the entire portable terminal, then the power transmission coverage is improved, but the size imbalance between transmitting and receiving coils increases, leading to reduced power transfer efficiency
Solution Approach 1:
The power transmitting coil is divided into multiple independent coil units (first coil unit, second coil unit, third coil unit, fourth coil unit) arranged in a 2x2 grid pattern. Each coil unit can be independently controlled to generate magnetic flux in specific directions. This segmentation allows the large transmitting coil to be divided into smaller functional units that can efficiently couple with the receiving coil at different positions, reducing energy loss while maintaining large coverage area.
2Volume of moving object
If the power receiving coil size is limited by the portable terminal size, then the portability is maintained, but the power reception efficiency decreases when positioned away from the center of the transmitting coil
Solution Approach 1:
The system dynamically controls the current direction in each transmitting coil unit based on the position of the receiving coil. When the receiving coil is positioned at different locations, the control unit adjusts which coil units are active and in what direction they generate magnetic flux. This dynamic adaptation ensures optimal magnetic coupling regardless of receiving coil position, maintaining high power transfer efficiency while keeping the receiving coil size compact for portability.
3Loss of energy
If the terminal connection scheme is used for charging, then the power transfer efficiency is high, but the terminal abrasion and safety risks increase due to instantaneous discharge and foreign material accumulation
Solution Approach 1:
The patent replaces the mechanical terminal connection system with a wireless power transmission system using magnetic induction. Instead of physically connecting terminals that are subject to abrasion, heat generation from foreign materials, and instantaneous discharge risks, the system uses electromagnetic fields to transfer power wirelessly. This substitution eliminates direct electrical contact between charging device and portable terminal, thereby eliminating terminal wear and associated safety hazards while maintaining efficient power transfer through optimized magnetic coupling between transmitting and receiving coils.
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 design enhances the degree of freedom in positioning the power receiving coil, stabilizes power transfer, and improves communication by maintaining optimal power induction and minimal voltage gain variation across different positions, reducing the impact of coil misalignment.
Implementation Method 1
The wireless power transmitting apparatus wirelessly transmits the power in, for example, an electromagnetic induction scheme
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 2c~3
AI summary
Disclosed herein are a power transmitting coil used to wirelessly transmit a power and a wireless power transmitting apparatus wirelessly transmitting a power using the power transmitting coil. The power transmitting coil includes: at least one first coil mounted on a central portion of a core and having a current flowing in a first direction in the case of transmitting a power; and at least one second coil at an outer side of the first coil on the core and having a current flowing in a second direction opposite to the first direction in the case of transmitting the power. The wireless power transmitting apparatus wirelessly transmit the power using the power transmitting coil including the first coil and the second coil.