Wireless Power Receiver Modulation Switching Under Foreign Objects
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Solution Overview
Problem
In wireless power transmission, communication can be disrupted due to the presence of foreign objects, leading to inappropriate modulation and potential stopping of power transmission.
Innovation Solution
A power receiving apparatus dynamically changes the degree of modulation of the load modulation signal if a response signal from the power transmitting apparatus is not received within a predetermined period, allowing for continued communication and foreign object detection.
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 appropriately when foreign objects are present during power transmission
Solution Approach 1:
The patent applies dynamics by making the degree of modulation adjustable rather than fixed. The power receiving apparatus dynamically changes the degree of modulation based on whether response signals are received within expected time periods, allowing the system to adapt to changing communication conditions during power transmission.
Solution Approach 2:
The patent implements feedback mechanisms where the power receiving apparatus monitors response signals from the power transmitting apparatus. Based on this feedback, the system determines whether to maintain or change the degree of modulation, ensuring communication continues appropriately even when foreign objects are present.
2Reliability
If the degree of modulation is increased to ensure communication, then communication reliability improves, but power transmission efficiency decreases due to premature stopping
Solution Approach 1:
The patent changes the modulation degree parameter dynamically based on communication conditions. By adjusting this parameter rather than using a fixed high value, the system maintains communication reliability while avoiding premature power transmission stopping, thus preserving power transmission efficiency.
Solution Approach 2:
The system transitions from static modulation degree selection to dynamic adjustment based on real-time communication status. This allows the system to maintain efficient power transmission by only increasing modulation degree when actually needed for communication reliability.
3Productivity
If the degree of modulation is decreased to improve power transmission efficiency, then productivity improves, but communication may be disrupted when foreign objects are present
Solution Approach 1:
The system dynamically adjusts modulation degree based on communication needs rather than using a permanently low setting. This allows the system to maintain high power transmission efficiency under normal conditions while ensuring communication reliability when foreign objects are detected.
Solution Approach 2:
The modulation degree parameter is changed from a fixed low value to a dynamically adjusted value based on communication conditions. This ensures that power transmission efficiency is maintained while communication reliability is preserved through selective parameter adjustment.
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 ensures reliable communication and foreign object detection, preventing the premature stopping of power transmission and maintaining efficient power transfer.
Implementation Method 1
communicates with the power transmitting apparatus by load modulation of the received power
Data Source
AI summary
A power receiving apparatus wirelessly receives power from a power transmitting apparatus, and communicates with the power transmitting apparatus by load modulation of the received power. A degree of modulation of the load modulation is changed in a case where a response signal from the power transmitting apparatus in response to a specific signal is not received within a predetermined period.