Wireless Power Transmission Apparatus Impedance Verification
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Solution Overview
Problem
In wireless power transfer systems, overlapping communication ranges between multiple power transmission apparatuses can lead to improper establishment of communication connections, resulting in unnecessary processing and potential inefficiencies, as power transmission apparatuses may inadvertently connect with power reception apparatuses outside their intended power transmission range.
Innovation Solution
A power transmission apparatus is equipped with a wireless power transfer unit, a reception unit for notification signals, an instruction unit to change the load impedance of the power reception apparatus, and a determination unit to verify the impedance change, ensuring that only intended power reception apparatuses within the transmission range receive power by limiting power transmission if the impedance change is not detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a power transmission apparatus receives notification signals from power reception apparatuses in overlapping communication ranges, then the communication connection may be established, but unnecessary power transmission processing occurs to apparatuses outside the intended transmission range
Solution Approach 1:
The power transmission apparatus transmits an impedance change instruction to the power reception apparatus and waits for feedback confirming the impedance has been changed. This feedback mechanism allows the transmission apparatus to verify that the received notification signal actually comes from a power reception apparatus within its transmission range, thereby preventing unnecessary power transmission to apparatuses outside the intended range
Solution Approach 2:
Before establishing a full power transmission connection, the system performs a preliminary action by transmitting an impedance change instruction and verifying compliance. This preliminary verification step ensures that only power reception apparatuses within the correct transmission range proceed to full power transmission, eliminating unnecessary processing
2Area of stationary object
If the communication range is extended beyond the power transmission range, then more power reception apparatuses can be detected, but improper connections occur with apparatuses outside the power transmission range
Solution Approach 1:
The feedback mechanism requiring impedance change confirmation ensures that even though the communication range extends beyond the power transmission range, only apparatuses within the transmission range that can respond to the impedance change instruction will establish a connection, thus maintaining connection accuracy
Solution Approach 2:
The system changes the impedance parameter of the power reception apparatus as a verification step. Since only apparatuses within the power transmission range can effectively respond to this parameter change, it serves as a reliable discriminator between apparatuses within and outside the intended transmission range
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 reduces unnecessary processing and ensures efficient wireless power transfer by accurately identifying and connecting only the intended power reception apparatuses within the power transmission range, preventing malfunctions due to improper connections.
Implementation Method 1
a wireless power transfer unit (203, 305) that transmits power wirelessly to a power reception apparatus
Data Source
AI summary
A power transmission apparatus transmitting power to a power reception apparatus and communicating with the power reception apparatus by applying a communication method which allows communication in a wider communication range than a power transmittable range includes a reception unit which receives a notification signal for notifying the existence of a power reception apparatus by applying the communication method, an instruction unit which instructs a power reception apparatus having transmitted the notification signal to change a load impedance consuming received power, a determination unit which determines that the source power reception apparatus has changed the load impedance in accordance with the instruction, and a wireless power transfer unit which wirelessly transfers power to the power reception apparatus if the determination unit determines that the source power reception apparatus has changed the load impedance in accordance with the instruction.