Wireless Induction Coil Alignment via DC Magnetic Attraction
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Solution Overview
Problem
Conventional inductive wireless power systems face challenges in aligning primary and secondary coils for efficient power transfer, with existing methods being costly, prone to mechanical failure, or limited by magnetic interference and spatial constraints.
Innovation Solution
A self-aligning inductive wireless power system uses a temporary DC magnetic field generated by wireless induction coils or magnets to attract the coils into alignment, allowing for efficient power transfer and providing haptic feedback to the user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple coil arrays are used to improve alignment flexibility, then the area for placing portable devices is increased, but the system cost increases significantly
Solution Approach 1:
The system uses the existing induction coils to generate magnetic fields that automatically attract and align portable devices with the charging surface, eliminating the need for multiple coil arrays or complex mechanical alignment mechanisms. The magnetic attraction force naturally guides the device into the optimal charging position.
2Adaptability or versatility
If movable coils with actuators are used to achieve alignment, then spatial freedom is improved, but mechanical reliability deteriorates due to moving parts
Solution Approach 1:
The patent replaces mechanical actuators and moving coils with a magnetic field-based alignment system. Induction coils generate magnetic fields that create attractive forces to align portable devices, eliminating all mechanical moving parts while maintaining spatial flexibility and alignment capability.
3Ease of operation
If permanent magnets are used to improve alignment, then alignment effectiveness is improved, but magnetic interference and spatial constraints increase
Solution Approach 1:
The system dynamically controls the magnetic field parameters by adjusting the current through induction coils, allowing the magnetic field strength and distribution to be optimized for alignment while minimizing interference. The magnetic field is activated only when needed for alignment, reducing continuous magnetic interference.
4Productivity
If close alignment of coils is achieved to improve power transfer efficiency, then power transfer efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The system incorporates feedback mechanisms that detect the alignment status between induction coils and portable devices, then adjust magnetic field parameters or provide haptic feedback to guide users into optimal positioning. This feedback loop compensates for manufacturing tolerances and achieves high power transfer efficiency without requiring extreme manufacturing precision.
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 effectively aligns primary and secondary coils for improved power transfer efficiency, is cost-effective, and reduces mechanical stress, while minimizing magnetic interference and spatial constraints.
Implementation Method 1
The inductive power supply includes a primary coil and the portable electronic device includes a secondary coil. The primary coil and secondary coil are aligned and may inductively couple for wireless power transfer.
Implementation Method 2
a direct current or DC current supplied through the wireless induction coil produces a temporary DC magnetic field or static field that interacts with the external DC magnet or ferromagnetic attractor, and results in magnetic force acting on the wireless induction coil
Data Source
AI summary
A wireless power system that may align a portable electronic device with an inductive wireless power supply. The induction coils used for transferring power wirelessly may be used as DC electromagnets to align the portable electronic device with the inductive wireless power supply. A DC current may be supplied to the primary coil and to the secondary coil to generate DC electromagnetic fields and attractive force between the primary and secondary coils. This attractive force may be used for alignment.