Wireless Power Receiver Switching Between RFID and Beacon Alignment
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Solution Overview
Problem
Existing wireless power transfer technologies face challenges in maintaining efficient power transmission when the battery of the power receiving device is low, as the beacon signal oscillator may not be driven, preventing proper direction alignment and power transfer.
Innovation Solution
Incorporating an RFID responder, beacon signal oscillator, power reception antenna, and control circuits to switch between RFID and beacon signal pathways based on battery power availability, allowing power transfer even when the beacon signal cannot be generated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the beacon signal oscillator is used for direction alignment in wireless power transfer, then power transmission accuracy is improved, but the system cannot operate when battery power is insufficient
Solution Approach 1:
The patent introduces an RFID responder as an intermediary component that can operate with minimal power. The RFID responder serves as a mediator for direction alignment when the beacon signal oscillator cannot function due to low battery power, enabling the system to maintain operability through this alternative intermediary mechanism
Solution Approach 2:
The patent changes the operational parameter of the power receiving device by switching between two modes: using the beacon signal oscillator for high-precision direction alignment when power is sufficient, and using the RFID responder for basic direction alignment when power is insufficient. This parameter change allows the system to adapt to different power availability conditions
2Measurement precision
If the beacon signal oscillator is always connected to the power reception antenna for direction alignment, then power transmission accuracy is maintained, but device complexity and power consumption increase
Solution Approach 1:
The patent implements a dynamic switching mechanism controlled by a control circuit that adjusts the system configuration based on power availability. The RFID-beacon changeover switch dynamically connects or disconnects the beacon signal oscillator and RFID responder to the power reception antenna, allowing the system to adapt its complexity to operational needs rather than maintaining fixed high-complexity configuration
Solution Approach 2:
The power reception antenna serves multiple functions: it receives power transmission signals, receives beacon signals for direction alignment, and receives RFID signals for alternative direction alignment. This multi-functionality reduces the need for separate dedicated components, thereby reducing overall device complexity while maintaining power transmission accuracy
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
Enables wireless power transfer even with low battery levels by switching to RFID mode for direction alignment, promoting miniaturization and cost reduction of the power receiving device.
Implementation Method 1
an electromagnetic induction system which uses magnetic field coupling
Implementation Method 2
uses radio waves such as microwaves and so forth
Data Source
AI summary
A wireless power receiving device (WPRD) comprises an RFID responder and a beacon signal oscillator to transmit an RFID response in a case where there is no electric power which is necessary for transmission of a beacon signal. A wireless power transmitting device (WPTD) operates in a wide area power transmission mode for transmitting the electric power at a wide angle toward a direction that it receives the RFID response. When the WPRD receives the electric power in a wide area power transmission mode and transmission of the beacon signal becomes possible, it transmits the beacon signal. The WPTD operates in a centralized power transmission mode for transmitting the electric power at a narrower angle toward a direction receiving the beacon signal. Also, during the centralized power transmission mode, it cyclically performs transmission and reception of the beacon signal to detect positions of the WPRD and the WPTD.