Dual-Transmit Coil Control for Magnetic Field Pre-Alignment
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Solution Overview
Problem
Existing wireless power transfer devices cannot control the direction of the magnetic field generated, making it inefficient and inconvenient to align with a secondary coil, leading to reduced energy transfer efficiency and potential interference with electronic components.
Innovation Solution
A wireless power transfer system with a controller that differentially drives two transmitting coils oriented along different axes, allowing for the generation of a magnetic field with a specific direction aligned with a receiver coil by adjusting the amplitudes and phase difference of the currents in the coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the primary coil direction is fixed, then the device structure is simple, but the magnetic field cannot be aligned with the secondary coil leading to reduced energy transfer efficiency
Solution Approach 1:
The transmitting coil system is segmented into two separate coils (first transmitting coil and second transmitting coil) with different orientations. Each coil generates a magnetic field component along its respective axis, and by controlling the amplitude and phase of currents in each coil, the resultant magnetic field direction can be adjusted to align with the secondary coil, thereby improving energy transfer efficiency without requiring the entire device to be movable.
Solution Approach 2:
The system dynamically adjusts the magnetic field direction by varying the amplitude ratio and phase difference between currents in the two transmitting coils. This dynamic control allows the magnetic field to be realigned with the secondary coil during operation, enabling efficient wireless power transfer even when relative positions change, thus resolving the contradiction between fixed structure and alignment capability.
2Productivity
If the primary coil is physically moved to align with the secondary coil, then alignment is improved, but the operation becomes cumbersome and time-consuming
Solution Approach 1:
The mechanical alignment system is replaced with an electromagnetic control system. Instead of physically moving the primary coil or secondary coil to achieve alignment, the system uses electronic control to adjust the current amplitudes and phases in the two transmitting coils, thereby changing the magnetic field direction. This substitution eliminates mechanical movement, making the alignment process faster and more convenient while maintaining high energy transfer efficiency.
3Productivity
If the magnetic field is generated without directional control, then the device structure is simple, but eddy currents are generated in nearby electronic components reducing efficiency
Solution Approach 1:
The system creates a localized and directional magnetic field by controlling the amplitude and phase of currents in the two transmitting coils. By adjusting the current parameters, the magnetic field is concentrated and directed specifically toward the secondary coil, rather than being generated uniformly in all directions. This localized field generation reduces the magnetic field exposure to nearby electronic components, thereby minimizing eddy current generation and improving overall energy transfer efficiency.
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
The system efficiently aligns the magnetic field with the receiver coil, enhancing energy transfer efficiency, reducing errors, and minimizing interference with nearby electronic components.
Implementation Method 1
A primary coil may be driven with AC current to generate an oscillating magnetic field
Implementation Method 2
the magnetic field can generate a current in a secondary coil in proximity to the primary coil via electromagnetic induction
Implementation Method 3
The primary coil in related art devices also generates a magnetic field that generates eddy currents in electronic components in the proximity of the primary coil
Data Source
AI summary
A wireless power transfer system includes a wireless power transfer device configured to determine a magnetic field, from among a plurality of directionally different potential magnetic fields that the wireless power transfer device is configured to generate, that has, at a receiver coil of an electronic device, a direction aligned with the receiver coil.