Wireless Power Transfer Foreign Object Detection by Waveform Attenuation
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Solution Overview
Problem
Existing wireless power transmission systems face inefficiencies and increased costs due to the need for additional circuits and time to transmit foreign object detection signals, which can lead to false detections and decreased transmission efficiency.
Innovation Solution
A power transmitting apparatus that measures the waveform attenuation rate and sets a threshold to determine the presence of foreign objects, allowing for foreign object detection without an additional detection signal, thereby reducing costs and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate foreign object detection signal transmission circuit is added, then foreign object detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The power transmitting apparatus uses its existing power transmission circuit to perform dual functions: transmitting power to the power receiving apparatus and detecting foreign objects. By measuring the waveform attenuation rate of the transmission power waveform, the system detects foreign objects without requiring a separate detection circuit, thereby reducing device complexity while maintaining detection capability
Solution Approach 2:
The foreign object detection function is merged with the power transmission function. The same antenna and transmission circuit used for power transfer are also used for foreign object detection by analyzing the attenuation characteristics of the transmission waveform, eliminating the need for separate detection hardware
2Reliability
If a separate foreign object detection signal transmission circuit is added, then foreign object detection capability is improved, but manufacturing cost increases
Solution Approach 1:
The existing power transmission circuit performs dual functions of power transfer and foreign object detection, eliminating the need for additional detection circuits and reducing component count, which directly lowers manufacturing costs
Solution Approach 2:
The power transmitting apparatus uses its own transmission power waveform to detect foreign objects through waveform attenuation measurement, rather than requiring separate detection signals or external detection systems, thereby reducing overall system cost
3Reliability
If foreign object detection signal transmission is performed, then foreign object detection capability is improved, but power transmission efficiency decreases
Solution Approach 1:
The system continuously monitors the waveform attenuation rate of the transmission power waveform during normal power transmission, allowing for continuous foreign object detection without interrupting or pausing the power transfer process, thereby maintaining high transmission efficiency
Solution Approach 2:
The patent replaces the conventional approach of transmitting separate detection signals with a method that substitutes mechanical/interrupted signal transmission with continuous waveform analysis during power transmission, eliminating the need to stop or pause power transfer for detection
4Reliability
If foreign object detection signal transmission is performed, then foreign object detection capability is improved, but transmission time increases
Solution Approach 1:
Foreign object detection is performed continuously during power transmission by monitoring the waveform attenuation rate in real-time, eliminating the need for separate detection time slots or interruptions, thereby reducing overall detection time
Solution Approach 2:
The system establishes the threshold for waveform attenuation rate in advance based on predetermined conditions, allowing for immediate foreign object detection without requiring additional time for threshold calculation or signal transmission setup
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 enhances foreign object detection accuracy and reduces costs by eliminating the need for additional detection signal transmission, improving the overall efficiency of wireless power transmission systems.
Implementation Method 1
a power transmitting unit (103) configured to wirelessly transmit power to a power receiving apparatus (401) via a power transmitting antenna (105)
Data Source
AI summary
A power transmitting apparatus measures a waveform attenuation rate of a transmission power waveform, at a transmission antenna, in a state in which the power transmission by the power transmitting is restricted, sets a threshold used for detecting a foreign object between the power transmitting apparatus and the power receiving apparatus on the basis of the measured waveform attenuation rate, and determines whether or not the foreign object is present on the basis of the waveform attenuation rate measure after the threshold is set and the threshold.