Omni-directional Wireless Power Transfer via Dynamic Flux Focusing
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Solution Overview
Problem
Current omni-directional wireless power transfer systems face limitations in generating a magnetic field in all directions, detecting load positions, and focusing magnetic flux efficiently, resulting in suboptimal energy efficiency and compatibility with devices having single planar coils.
Innovation Solution
A method involving non-identical current control for three orthogonal coils, adjusting voltage and current amplitudes to form magnetic coordinates, and applying reference vectors to focus magnetic flux towards detected loads, ensuring even energy distribution and maximizing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three orthogonal coils are connected in series and driven with identical current to achieve omni-directional power transfer, then the system can transfer power to receivers at multiple angles, but the energy efficiency is limited to below 50% due to impedance matching constraints
Solution Approach 1:
The patent changes the current parameters of the three orthogonal coils from identical to non-identical, with different amplitudes and phase angles. This allows the magnetic field vector to be dynamically controlled to point in specific directions, enabling the system to focus magnetic flux towards loads and achieve energy efficiency above 50% while maintaining omni-directional power transfer capability
Solution Approach 2:
The patent implements dynamic control of the coil currents by continuously adjusting the amplitude and phase angle parameters based on load position detection. The system dynamically redirects the magnetic field vector to follow the load position, transforming the static identical-current approach into a dynamic adaptive system that maximizes energy transfer efficiency
2Power
If impedance matching based on maximum power transfer theorem is used to design the resonant circuit, then the system can achieve power transfer at resonance frequency, but the system becomes dimension-dependent and restrictive in terms of relative sizes of transmitter and receiver coils
Solution Approach 1:
The patent changes the design approach from impedance matching based on fixed dimensional relationships to a parameter-based control method where the magnetic field direction is controlled by adjusting current amplitudes and phase angles. This allows the system to work with receivers of various sizes and configurations, including modern planar coil receivers, without being constrained by specific dimensional ratios
3Adaptability or versatility
If the magnetic field vector is allowed to point in all directions simultaneously to achieve true omni-directional coverage, then all areas receive equal power distribution, but the energy efficiency in each direction is reduced
Solution Approach 1:
The patent implements periodic scanning of the magnetic field vector across different directions rather than maintaining simultaneous omnidirectional coverage. The system periodically redirects the magnetic field to point at different positions, ensuring all areas receive power over time while maintaining high efficiency in each directional focus. This time-division approach allows the magnetic field to concentrate energy in one direction at a time while still providing omni-directional coverage across the scanning period
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 high-energy-efficient omni-directional wireless power transfer by generating a magnetic field in all directions, accurately detecting load positions, and directing magnetic flux for optimal energy transfer, overcoming previous efficiency limitations and device compatibility issues.
Implementation Method 1
A wireless power transmitter includes three orthogonal coils (Tx coils) arranged at the same center position and orthogonal to each other in a three-dimensional space... each of the three coils generating a magnetic field vector
Implementation Method 2
A receiver system also comprising three orthogonal coils... the format factor of the mobile devices requires the receiver coil to be a planar one... the receiver coil pick up maximum power
Data Source
AI summary
The present invention is directed towards methods and systems for omni-directional wireless power transfer. The method comprises generating magnetic field in all directions, detecting the loads based on the magnetic field shape and focusing the power flow towards the detected loads, so as to maximize the energy efficiency of the wireless power transfer.