Wireless Power Load Modulation Control Under Foreign Object Interference
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Solution Overview
Problem
In wireless power transmission, communication can be disrupted due to foreign objects interfering with the power transmission range, leading to inappropriate modulation and potential communication stoppages.
Innovation Solution
A power transmitting apparatus that requests a change in the degree of modulation of the load modulation signal from the power receiving apparatus based on the amplitude of the signal, ensuring reliable communication by adjusting the modulation to maintain effective demodulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed degree of modulation is determined at the start of power transmission, then communication can be established initially, but communication may stop when foreign objects interfere with the power transmission range
Solution Approach 1:
The patent applies dynamics by making the degree of modulation adjustable rather than fixed. The power transmitting apparatus dynamically changes the degree of modulation based on communication quality feedback, allowing the system to adapt to changing conditions such as foreign object interference during power transmission
Solution Approach 2:
The patent implements feedback by having the power receiving apparatus evaluate communication quality and notify the power transmitting apparatus. Based on this feedback loop, the power transmitting apparatus adjusts the degree of modulation to maintain reliable communication even when foreign objects enter the power transmission range
2Reliability
If the degree of modulation is increased to maintain communication, then communication reliability improves, but the system becomes less adaptable to varying transmission conditions
Solution Approach 1:
The patent applies self-service by enabling the power receiving apparatus to autonomously evaluate communication quality and notify the power transmitting apparatus. This distributes the intelligence for maintaining communication reliability across both devices, reducing the control complexity burden on any single component
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 effectively suppresses communication stoppages by adjusting the modulation to accommodate foreign objects, ensuring continuous and reliable power transmission and communication.
Implementation Method 1
a power transmitting apparatus that wirelessly transmits power to a power receiving apparatus
Implementation Method 2
a load modulation method is known in which a power receiving apparatus performs amplitude modulation on transmitted power when the power receiving apparatus provides a notification to a power transmitting apparatus
Data Source
AI summary
A power transmitting apparatus wirelessly transmits power to a power receiving apparatus, and communicates with the power receiving apparatus. The power transmitting apparatus transmits, to the power receiving apparatus, a signal to request a change in a degree of modulation of a load modulation signal, which is received from the power receiving apparatus, in accordance with an amplitude of the load modulation signal.