Phase-Variable Relay Coil for Wireless Power Efficiency
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Solution Overview
Problem
Wireless power transmission systems face efficiency issues due to low power transmission and reception in certain positions within a relay coil system, leading to reduced charging efficiency and potential failure in power delivery.
Innovation Solution
A wireless power relay device with a phase-variable relay coil that has a larger coupling coefficient than other coils, arranged to be out of phase with the magnetic field relayed by other coils, particularly in sections with lower transmission efficiency, to prevent sharp decreases in power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If relay coils are arranged in a magnetic resonance wireless power transmission system, then the wireless charging range is extended, but transmission efficiency sharply decreases in certain sections
Solution Approach 1:
The patent applies local quality by differentiating relay coils into two types based on their position: first relay coils for normal sections and second relay coils for efficiency-reducing sections. The second relay coils have different characteristics (higher number of turns or larger area) to compensate for the sharp efficiency decrease in specific sections, ensuring uniform power transmission across the entire charging range.
Solution Approach 2:
The patent changes physical parameters of relay coils to maintain transmission efficiency. Specifically, it adjusts the number of turns or area of relay coils in efficiency-reducing sections to increase their magnetic flux sum, thereby compensating for the sharp efficiency decrease and maintaining consistent power transmission across different positions.
2Loss of energy
If the number of turns of relay coils is increased, then power transmission efficiency is improved, but device complexity increases
Solution Approach 1:
Instead of uniformly increasing the number of turns for all relay coils, the patent applies local quality by only increasing turns or area for relay coils in efficiency-reducing sections. This targeted approach improves transmission efficiency where needed while minimizing the overall increase in device complexity.
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
Prevents sharp decreases in transmission efficiency by adjusting mutual inductance and coupling coefficients, ensuring consistent and effective power delivery to wireless power receiving devices.
Implementation Method 1
The magnetic resonance method is a technique of transmitting non-radial magnetic-field energy between two resonators spaced from each other through resonant coupling
Implementation Method 2
The magnetic induction method is a technique using magnetic inductive coupling between adjacent coils
Data Source
AI summary
The present invention is mainly directed to providing a wireless power relay device and a wireless power transmission device, which are capable of arranging a relay coil having higher transmission efficiency in a transmission-efficiency reducing section having lower transmission efficiency than those of a plurality of relay coils, thereby preventing power transmission efficiency from sharply decreasing in the transmission-efficiency reducing section.