Multiplexed Wireless Power Transmission Phase Control
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Solution Overview
Problem
Conventional wireless power transmission systems face challenges with multiplex transmission due to mutual interference between antennas, leading to increased size and cost, as the phase difference between resonant magnetic fields approaches 180 degrees, causing magnetic flux cancellation and requiring separation or shielding.
Innovation Solution
A multiplex wireless power transmission system employing transmission power circuits that provide adjacent channels with half-wave resonance waveforms by shifting the phase of voltage or current, avoiding power wave overlap and reducing magnetic flux cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the phase difference between resonant magnetic fields is increased to boost transmission power, then power transmission efficiency is improved, but magnetic flux cancellation occurs when the phase difference approaches 180 degrees, reducing transmission energy
Solution Approach 1:
The patent applies periodic action by controlling the phase difference between resonant magnetic fields of adjacent channels to vary periodically within a range excluding 180 degrees, thereby avoiding magnetic flux cancellation while maintaining boosted transmission power through constructive interference at other phase differences
2Volume of moving object
If antennas of individual channels are placed close to each other for compact size, then device size is reduced, but mutual interference between antennas increases, degrading transmission quality
Solution Approach 1:
The patent changes the parameter of phase difference between resonant magnetic fields of adjacent channels to a value other than 180 degrees, which fundamentally alters the magnetic field interaction pattern from cancellation to constructive interference, thereby enabling close antenna placement without mutual interference degradation
3Object-affected harmful factors
If channels are disposed separately by a distance greater than transmission distance to reduce mutual interference, then interference is minimized, but device size increases and magnetic shielding is required, increasing cost
Solution Approach 1:
The patent changes the phase difference parameter between adjacent channels to prevent magnetic flux cancellation, which eliminates the need for large spatial separation or magnetic shielding, thereby achieving both interference reduction and compact system size simultaneously
4Object-affected harmful factors
If magnetic shielding is applied to separate magnetic fluxes of individual channels, then mutual interference is reduced, but system cost increases due to additional shielding components
Solution Approach 1:
The patent changes the phase difference parameter between adjacent channels to a value that prevents magnetic flux cancellation, thereby eliminating mutual interference without requiring magnetic shielding components, which significantly reduces manufacturing cost while maintaining interference reduction
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 configuration enables efficient multiplex power transmission with reduced antenna distance, simplifying electromagnetic shielding and lowering costs, while maintaining compliance with Radio Law regulations, allowing for a compact and cost-effective design.
Implementation Method 1
plural channels of transmission power circuits that establish resonance conditions of the paired transmitting antennas
Implementation Method 2
plural channels of receiving power circuits that establish resonance conditions of the paired receiving antennas
Implementation Method 3
a power receiving antenna, which receives, by coupling a resonant magnetic field, at least a part of the RF energy that has been transmitted by the power transmitting antenna
Implementation Method 4
a configuration has been known which comprises a plurality of power transmitters that shift phase difference between their resonant magnetic fields
Data Source
Figure 1~3
Figure 4
AI summary
A system includes a primary transmission power supply 1 that provides single frequency power; a transmitter-receiver having plural channels of transmitting antennas 5 that wirelessly transmit power provided from the primary transmission power supply 1 and plural channels of receiving antennas 6 that receive the power transferred from the paired transmitting antennas 5; plural channels of transmission power circuits 2 that establish resonance conditions of the paired transmitting antennas; and plural channels of receiving power circuits 4 that establish resonance conditions of the paired receiving antennas, in which the individual transmission power circuits 2 provide the transmitting antennas 5 of adjacent channels with powers with half-wave resonance waveforms that avoid a period during which the power waves overlap on each other by shifting a phase of voltage or current of the powers.