Wireless Power Transmitter with Geomagnetic Sensor for Moving Device Tracking
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Solution Overview
Problem
Conventional wireless power transmission systems face inefficiencies when charging portable electronic devices that are moved, as they require time to re-determine the device's position, leading to disrupted charging.
Innovation Solution
A wireless power transmitter using a geo-magnetic sensor to identify an absolute coordinate system and adjust RF wave transmission conditions based on movement information from the electronic device, allowing for continuous and efficient charging by dynamically steering the RF waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless power transmitter forms RF waves in multiple directions to determine the electronic device position, then the charging can be initiated, but when the device moves, time is consumed to re-determine the position and charging is discontinued
Solution Approach 1:
The electronic device actively reports its position and orientation information to the wireless power transmitter through communication circuits. This feedback mechanism allows the transmitter to continuously track the device's location without needing to perform time-consuming multi-directional RF wave scanning, thereby maintaining charging continuity and eliminating position determination delays.
Solution Approach 2:
The electronic device pre-determines its own position and orientation using onboard sensors (geo-magnetic sensor, accelerometer, gyro sensor) and communicates this information to the wireless power transmitter in advance. This preliminary action enables the transmitter to proactively adjust RF wave transmission directions before the device moves, ensuring continuous charging without interruption.
2Measurement precision
If the wireless power transmitter continuously scans multiple directions to track the electronic device, then the position can be accurately determined, but the system complexity and power consumption increase
Solution Approach 1:
The electronic device performs self-positioning and self-orientation determination using its onboard sensors (geo-magnetic sensor, accelerometer, gyro sensor) and communicates the results to the wireless power transmitter. This self-service approach eliminates the need for the transmitter to perform complex multi-directional scanning, significantly reducing system complexity while maintaining high position determination accuracy.
Solution Approach 2:
The electronic device acts as an intermediary that bridges the wireless power transmitter and the physical environment. Instead of the transmitter directly sensing the device's position through complex RF wave scanning, the device uses its onboard sensors to detect its own position and orientation, then communicates this information to the transmitter, simplifying the overall system architecture.
3Productivity
If the wireless power transmitter uses conventional RF wave formation in multiple directions, then power can be transmitted to stationary devices, but the transmission efficiency drops when devices move
Solution Approach 1:
The wireless power transmitter dynamically adjusts the direction of RF wave transmission based on real-time position and orientation information received from the electronic device. This dynamic adaptation allows the transmitter to continuously track moving devices and maintain optimal power transmission efficiency, eliminating the inefficiencies associated with static multi-directional scanning approaches.
Solution Approach 2:
The electronic device provides continuous feedback regarding its position and orientation to the wireless power transmitter. This feedback enables the transmitter to adjust RF wave transmission directions in real-time, maintaining high power transmission efficiency and charging stability even when the device is moving, rather than relying on periodic multi-directional scanning.
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 reduces the time to detect and charge moving electronic devices, ensuring high-efficiency wireless power transmission and reception by accurately tracking the device's position and orientation.
Implementation Method 1
configuring a coordinate system based on, at least, geo-magnetic sensing information from a geo-magnetic sensor
Implementation Method 2
a plurality of power transmission antennas configured to form a radio frequency (RF) wave
Data Source
AI summary
According to various embodiments, provided is a wireless power transmission device comprising a plurality of power transmission antennas, a geomagnetic sensor, a processor, and a communications circuit, wherein the processor is configured to: set a coordinate system on the basis of geomagnetic sensing information from the geomagnetic sensor; control such that, for charging an electronic device, a first RF wave is formed under a first transmission condition through the plurality of power transmission antennas; receive, from the electronic device and through the communications circuit, first information on a change in the position or location, or both, of the electronic device; at least on the basis of the first information, confirm the position or location, or both, of the electronic device in the coordinate system after the change of the electronic device; and control such that a second RF wave is formed under a second transmission condition through the plurality of power transmission antennas, wherein the second transmission condition is confirmed on the basis of the location or position, or both, of the electronic device after the change. Other various embodiments are possible.