Wireless Charging Coil Segmentation for Magnetic Field Pre-Alignment
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Solution Overview
Problem
Existing wireless power transfer systems struggle with aligning the magnetic field direction with the secondary coil, requiring physical movement of coils, which is inconvenient and reduces efficiency, and generate eddy currents in nearby components.
Innovation Solution
A wireless power transfer device with two magnetically decoupled transmitting coils and a controller that differentially controls their currents to align the magnetic field direction with the receiver coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the primary coil direction is fixed, then the device structure is simple, but the magnetic field cannot be aligned with the secondary coil requiring physical movement
Solution Approach 1:
The primary coil is divided into multiple independent coil segments (first primary coil segment, second primary coil segment, etc.) that can be independently controlled. This segmentation allows the magnetic field direction to be adjusted by controlling different segments without physically moving the entire coil assembly, resolving the contradiction between alignment convenience and structural complexity.
Solution Approach 2:
The patent implements dynamic control of the magnetic field direction by independently activating different primary coil segments based on the detected secondary coil position. The controller dynamically adjusts which segments are active and their current magnitudes, enabling real-time magnetic field alignment without mechanical movement, thus improving ease of operation while maintaining structural simplicity.
2Measurement precision
If the primary coil is moved to align with the secondary coil, then alignment is improved, but the alignment speed is slow and efficiency is reduced
Solution Approach 1:
The patent replaces the mechanical alignment system (physically moving the primary coil) with an electromagnetic control system. By independently controlling multiple primary coil segments, the magnetic field direction can be rapidly adjusted to match the secondary coil orientation without any mechanical movement, achieving both high alignment precision and fast alignment speed.
Solution Approach 2:
The controller dynamically determines optimal current magnitudes for different primary coil segments based on real-time detection of secondary coil position and orientation. This dynamic electromagnetic adjustment enables instant alignment response, dramatically improving alignment speed compared to mechanical movement while maintaining precise alignment through feedback control.
3Power
If the primary coil generates a magnetic field, then energy transfer is enabled, but eddy currents are generated in nearby electronic components reducing efficiency
Solution Approach 1:
The patent applies local quality control by selectively activating specific primary coil segments based on the detected secondary coil position and orientation. Instead of generating a magnetic field in all directions, only the necessary coil segments are activated to create the magnetic field precisely where needed, minimizing exposure of surrounding electronic components to the magnetic field and reducing eddy current losses while maintaining effective energy transfer.
Solution Approach 2:
The patent uses partial action by activating only the necessary subset of primary coil segments required for alignment and energy transfer, rather than all segments simultaneously. This selective activation reduces the overall magnetic field footprint, minimizing interference with nearby electronic components and reducing eddy current energy losses while maintaining sufficient power transfer capability.
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
Enables efficient alignment of the magnetic field with the receiver coil without physical movement, reducing errors and eddy currents, thereby improving energy transfer efficiency.
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.