Wireless Power Antenna Misalignment Correction via Reflected Waves
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Solution Overview
Problem
Wireless power transmission using electromagnetic waves faces efficiency degradation due to misalignment and electromagnetic wave leakage, particularly in systems lacking dedicated components for position recognition and alignment.
Innovation Solution
The method and system utilize the power transmission and reception antennas with a reflector to perform misalignment correction by using peripheral antenna elements as position-detection power transmission antennas and internal elements as position-detection power reception antennas, calculating the positional relation based on reflected electromagnetic waves and adjusting for optimal alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large power transmission surface is used to cover the misalignment range, then power transmission reliability is improved, but electromagnetic wave leakage increases
Solution Approach 1:
The power transmission antenna surface is divided into multiple antenna elements that can be independently controlled. By segmenting the large surface into smaller functional units, the system can activate only the necessary elements for power transmission while keeping other elements inactive, thus maintaining reliability without causing excessive electromagnetic wave leakage from unused portions.
Solution Approach 2:
The antenna elements are dynamically switched between transmission and reception modes based on real-time position detection. During misalignment correction, peripheral elements transmit while internal elements receive reflected waves. During power transmission, the configuration is reversed. This dynamic adaptation allows the system to maintain optimal performance while minimizing electromagnetic wave leakage at each operational stage.
2Measurement precision
If separate components are added for position recognition, then alignment precision is improved, but device complexity increases
Solution Approach 1:
The antenna elements serve dual functions: they act as transmission elements for power supply and as reception elements for position detection. By making the antenna system multi-functional, the invention eliminates the need for separate positioning components while maintaining high alignment precision through reflected wave detection.
Solution Approach 2:
The system uses its own antenna elements to perform both power transmission and position recognition tasks. The internal antenna elements detect the position of the power reception antenna by receiving reflected electromagnetic waves, allowing the system to self-correct misalignment without external positioning devices.
3Measurement precision
If mechanical control is used for alignment, then positioning accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The invention replaces mechanical alignment control with an electromagnetic field-based detection and correction system. Position detection is achieved through electromagnetic wave reflection detection, and misalignment correction is performed by electronically switching antenna element functions rather than through mechanical movement, thereby improving ease of operation while maintaining positioning accuracy.
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 approach enables efficient and safe wireless power supply with reduced electromagnetic wave leakage, eliminating the need for additional positioning components and ensuring accurate alignment without efficiency loss.
Implementation Method 1
a reflector is provided outside the power reception surface and inwardly inclined at a predetermined angle with respect to the power reception surface
Implementation Method 2
electric power is transmitted from a power transmission apparatus to a movable power reception apparatus that is located far from the power transmission apparatus. Microwaves in the range of several hundreds of megahertz to several gigahertz can be transmitted
Data Source
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AI summary
In a method and system for wireless power supply, the misalignment between the power transmission antenna and the power reception antenna is detected based on the electric power of an electromagnetic wave radiated from the position-detection power transmission antennas of the power transmission antenna, reflected by a reflector provided outside the power reception surface of the power reception antenna, and detected by the position-detection power reception antennas of the power transmission antenna.