Wireless Power Receiver Switching Transfer Methods
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Solution Overview
Problem
In wireless power transfer systems using the resonant magnetic coupling method, there is a risk of power being received by unintended apparatuses due to overlapping frequency bands, leading to inefficiencies and potential damage to intended power receiving devices.
Innovation Solution
A power receiving and transmitting apparatus that can switch between different wireless power transfer methods (such as resonant magnetic coupling and electromagnetic induction) based on detection of unexpected power, using multiple power transfer units and control units to ensure power is transmitted only to the intended device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the resonant magnetic coupling method is used for wireless power transfer, then power can be transmitted to multiple receiving apparatuses with different resonance frequencies, but power may be received by unintended apparatuses due to overlapping frequency bands
Solution Approach 1:
The system dynamically switches between resonant magnetic coupling method (for transmitting to multiple devices) and electromagnetic induction method (for preventing unintended reception). The control unit monitors power reception status and changes transmission method in real-time to maintain reliability while preserving multi-device capability.
Solution Approach 2:
The system changes the power transmission parameter (transmission method) based on detection results. When unintended power reception is detected, the system switches from resonant magnetic coupling to electromagnetic induction, changing the physical parameter of power transmission to resolve the contradiction.
2Loss of energy
If the resonant magnetic coupling method is used with wide frequency band, then power transfer efficiency is maintained despite distance variations, but frequency band overlap causes unintended power reception
Solution Approach 1:
The system uses electromagnetic induction method as a protective measure. While electromagnetic induction has lower efficiency for distant transmission, it provides narrow frequency band transmission that prevents unintended power reception, converting a potential disadvantage into a harmful factor prevention mechanism.
Solution Approach 2:
The system dynamically adjusts transmission method based on operational conditions. When high efficiency is needed and no unintended reception risk exists, resonant magnetic coupling is used. When unintended reception is detected, the system switches to electromagnetic induction to eliminate the harmful effect.
3Productivity
If power transmitting apparatus continuously transmits power using resonant magnetic coupling, then power transfer efficiency is maximized, but unintended power receiving apparatus may be overloaded
Solution Approach 1:
The system implements feedback control by monitoring power reception status at receiving apparatuses. When unintended power reception or overload is detected, the control unit receives this feedback and switches the transmission method to electromagnetic induction, preventing further harm while maintaining overall system productivity.
Solution Approach 2:
The system takes preliminary anti-action by switching to electromagnetic induction method before severe overload damage occurs. The control unit detects early signs of unintended power reception and proactively changes transmission parameters to prevent harmful effects.
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
Prevents unintended power reception, maintains transfer efficiency by switching to alternative methods when unexpected power is detected, and ensures safe operation by preventing overload of intended power receiving devices.
Implementation Method 1
The basic principle of the electromagnetic induction method is to make an inductive current run in a power receiving coil by causing a magnetic flux which is generated from running a current in a power transmitting coil to penetrate the power receiving coil.
Implementation Method 2
In the resonant magnetic coupling method, power transfer is performed by causing the power transmitting apparatus and the power receiving apparatus to resonate at the same frequency.
Data Source
AI summary
A power receiving apparatus, that complies with at least two power transfer methods and receives power wirelessly from a power transmitting apparatus, detects unexpected power which is not power transmitted from the power transmitting apparatus while a first power transfer method is used out of the at least two power transfer methods. When the unexpected power is detected, the power receiving apparatus controls the power transmitting apparatus and the power receiving apparatus so that a second power transfer method which is different from the first power transfer method out of the at least two power transfer methods is used.