Wireless Power Feed Control Using Magnetic Alignment Sensing
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Solution Overview
Problem
Existing wireless power supply systems for small mobile devices like mobile information terminals and smart watches face inefficiencies due to varying inter-device distances and misalignments, leading to reduced power supply efficiency and wasteful power consumption.
Innovation Solution
A power supply system with a power transmission device and a power reception device, utilizing magnets for alignment, magnetic sensors for distance detection, and control units to switch between power transmission methods (electromagnetic induction, magnetic resonance, and radio wave reception) based on alignment and distance, ensuring optimal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If wireless power transmission is performed without considering inter-device distance, then power can be supplied to the power reception device, but power supply efficiency decreases and wasteful power consumption occurs
Solution Approach 1:
The patent implements a feedback mechanism where the power transmission device continuously detects the distance to the power reception device using a distance detection unit. Based on this detected distance information, the control unit dynamically adjusts the power transmission output or stops transmission when the distance exceeds a predetermined threshold. This closed-loop feedback system ensures power is only transmitted when efficient, preventing wasteful power consumption when devices are too far apart.
Solution Approach 2:
The patent makes the power transmission system dynamic by continuously monitoring inter-device distance and adapting the power transmission state accordingly. Rather than fixed power transmission, the system transitions between different operational states (active transmission, reduced transmission, or stopped transmission) based on real-time distance conditions, optimizing energy efficiency across varying usage scenarios.
2Use of energy by moving object
If magnetic alignment is used to improve power transmission efficiency, then power supply efficiency increases in close contact, but the system cannot cope with devices that are apart from each other
Solution Approach 1:
The patent creates a universal power transmission system that handles multiple operational scenarios through a single integrated design. The system universally supports both close-contact magnetic alignment mode (for high efficiency) and distant radio wave transmission mode (for positional flexibility). The control unit automatically selects the appropriate transmission method based on detected distance, making the system adaptable to various usage conditions without requiring separate systems.
Solution Approach 2:
The patent changes the operational parameters of the power transmission system based on distance. When devices are in close proximity, the system uses magnetic alignment with induction coils at high power. When devices are apart, the system switches to radio wave transmission with adjusted power parameters. This parameter adaptation allows the system to maintain effectiveness across different spatial configurations.
3Ease of operation
If power transmission is continuously performed regardless of alignment, then the power reception device can receive power, but power supply efficiency decreases due to misalignment
Solution Approach 1:
The patent employs feedback mechanisms to monitor both distance and alignment status. The magnetic sensor detects the magnetic field strength which indicates alignment quality, while the distance detection unit measures inter-device separation. The control unit uses this feedback information to determine whether to continue, adjust, or stop power transmission, ensuring efficient operation only when proper alignment and proximity are achieved.
Solution Approach 2:
The patent introduces magnetic field detection as an intermediary indicator of alignment quality. Rather than directly measuring alignment geometry, the system uses magnetic sensor readings as an intermediate parameter to infer alignment status. This intermediary measurement enables the control unit to make informed decisions about power transmission efficiency without complex direct alignment measurement systems.
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 maintains high power supply efficiency by aligning devices magnetically and adaptively switching transmission methods, preventing power wastage and ensuring efficient charging of mobile devices.
Implementation Method 1
a magnetic sensor for detecting a magnetic force from a power reception side magnet provided in the power reception device
Implementation Method 2
Methods for supplying power wirelessly include an electromagnetic induction method, a magnetic resonance method
Implementation Method 3
Methods for supplying power wirelessly include an electromagnetic induction method, a magnetic resonance method
Implementation Method 4
the wearable power supply device is configured to be attracted to the wearable device by the force of a magnet
Data Source
AI summary
In a power supply system for wirelessly supplying power between a power transmission device and a power reception device, the power transmission device includes a power transmission unit for generating supply power and transmitting the generated supply power to the power reception device; a power transmission side magnet for alignment with the power reception device; a magnetic sensor for detecting a magnetic force from a power reception side magnet provided in the power reception device; and a control unit for controlling the power transmission device. The power reception device includes: a power reception unit for receiving the supply power supplied from the power transmission device; the power reception side magnet for alignment with the power transmission device; and a control unit for controlling the power reception device. When the power transmission device and the power reception device are in close contact with each other, power is wirelessly transmitted from the power transmission unit to the power reception unit in a state in which the power transmission unit and the power reception unit are aligned by an attractive magnetic force between the power transmission side magnet and the power reception side magnet. When the power transmission device and the power reception device are apart from each other, the control unit of the power transmission device starts or stops power transmission from the power transmission unit according to a magnetic force detection signal from the power reception side magnet detected by the magnetic sensor.