Wireless Power Receiver Switching From RFID to 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
The system incorporates 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 to determine power transmission direction, then power transmission alignment 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. When the beacon signal oscillator cannot function due to low battery, the RFID responder serves as a mediator to establish communication and enable power transmission direction determination without requiring the beacon signal oscillator to be operational.
Solution Approach 2:
The system dynamically changes operational parameters by switching between beacon signal mode (when power is sufficient) and RFID responder mode (when power is insufficient). This parameter change allows the system to adapt to varying power conditions while maintaining the core function of power transmission direction alignment.
2Measurement precision
If the beacon signal oscillator is always required for operation, then power transmission direction can be accurately determined, but device complexity and power consumption increase
Solution Approach 1:
The power receiving device is designed with multi-functionality by incorporating both a beacon signal oscillator and an RFID responder. The RFID responder serves dual purposes: it can operate independently when power is low, and it also assists in power transmission direction determination alongside the beacon signal oscillator when power is sufficient, thereby reducing overall system complexity.
3Length of stationary object
If microwave power transfer is used to achieve longer transmission distance, then transmission distance is improved, but transmission efficiency deteriorates
Solution Approach 1:
The patent employs feedback mechanisms where the RFID responder provides response signals that allow the power transmitting device to adjust transmission parameters. This feedback loop enables optimized power transmission at longer distances by correcting for signal attenuation and maintaining efficient energy transfer, thus resolving the contradiction between transmission distance and efficiency.
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 utilizing RFID communication to align and direct power transmission, 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
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.