Wireless Power Transfer Discrimination Using Signal Waveform Deformation
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Solution Overview
Problem
In wireless power transfer systems, distinguishing between power deterioration caused by foreign substances and multiple power receiving apparatuses sharing power is challenging, leading to inefficient power transfer and potential abnormal state misidentification.
Innovation Solution
A power transfer system with detection and deformation means in power receiving apparatuses to observe and modify power transfer signals, allowing determination of whether power deterioration is due to a foreign substance or another power receiving apparatus, thereby differentiating between normal and abnormal states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resonant magnetic coupling scheme is used for wireless power transfer, then power transfer range is extended and multiple power receiving apparatuses can be supplied simultaneously, but it becomes impossible to discriminate between foreign substances and other power receiving apparatuses causing power deterioration
Solution Approach 1:
The patent implements a feedback mechanism where each power receiving apparatus monitors the power transfer signal and detects waveform deformations caused by other apparatuses. This feedback loop enables the system to identify the presence and state of multiple power receiving apparatuses, resolving the discrimination problem while maintaining the benefits of wide-range simultaneous power supply.
Solution Approach 2:
The patent introduces signal waveform analysis as an intermediary mechanism to detect the presence of other power receiving apparatuses. By analyzing waveform deformations in the power transfer signal, the system can indirectly identify the state of other apparatuses without direct communication, enabling accurate discrimination while maintaining system versatility.
2Loss of information
If load modulation scheme is used for transmitting control signals, then information exchange for power control is enabled, but the system cannot distinguish between abnormal power consumption by foreign substances and normal power sharing among multiple apparatuses
Solution Approach 1:
The patent adds a new dimension of analysis by examining waveform deformation patterns in addition to power level measurements. This dimensional expansion allows the system to differentiate between foreign substances and power receiving apparatuses, improving state identification reliability while maintaining control signal transmission capabilities through load modulation.
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 solution enables accurate identification of power state changes, improving power transfer efficiency by distinguishing between foreign substances and multiple power receiving apparatuses, ensuring proper operation and user notification.
Implementation Method 1
wireless power transfer, in which power is transferred wirelessly without using a metal contact such as a connector
Implementation Method 2
the use of a resonant magnetic coupling scheme has been examined
Implementation Method 3
if there is a foreign substance such as a metal fragment near a power supply apparatus, an eddy current is generated in that foreign substance, increasing power consumption
Data Source
AI summary
A first power receiving apparatus observes a power transfer signal from a power supply apparatus, and detects whether power transfer is being performed between the power supply apparatus and a second power receiving apparatus. When the power transfer is being performed between the power supply apparatus and the second power receiving apparatus, a waveform of the signal is deformed with a predetermined pattern. The second power receiving apparatus detects deterioration in power which is received from the power supply apparatus and detects whether the waveform of the signal changes with the predetermined pattern within a predetermined time after detecting the power deterioration. When detecting the change in the waveform of the signal with the predetermined pattern, the second power receiving apparatus determines that the first power receiving apparatus is in a power suppliable range of the power supply apparatus.