Wireless Power Calibration for Reliable Foreign Object Detection
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in accurately calibrating transmitted and received power due to changes in magnetic coupling and usage environments, which affects foreign object detection (FOD) reliability.
Innovation Solution
The system employs a method for adaptive power calibration, where a wireless power transmission device and receiver exchange power packets to adjust power transmission based on load changes and magnetic coupling variations, enhancing FOD capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If magnetic coupling is used for wireless power transfer, then power transmission capability is improved, but power calibration accuracy deteriorates due to changes in magnetic coupling based on usage environments
Solution Approach 1:
The system performs preliminary power calibration by transmitting test power packets before actual power transfer. The transmitter sends calibration packets at different power levels, the receiver measures received power and transmits feedback, and the transmitter uses this feedback to determine accurate power calibration values before normal operation begins.
Solution Approach 2:
The system implements a feedback mechanism where the receiver measures the actual received power from transmitted packets and sends this information back to the transmitter. The transmitter then adjusts its power calibration based on the difference between transmitted and received power measurements, continuously refining accuracy despite magnetic coupling variations.
2Measurement precision
If adaptive power calibration is performed to improve FOD reliability, then measurement precision is improved, but device complexity increases due to additional power packet exchanges
Solution Approach 1:
The system uses universal power packets that serve multiple functions: they can be used for normal power transfer, for calibration measurements, and for foreign object detection. The same communication infrastructure and packet formats are reused across different operational modes, reducing the need for separate dedicated calibration protocols and minimizing additional complexity.
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 enables precise power calibration and improved foreign object detection, ensuring reliable and efficient wireless power transfer in dynamic environments.
Implementation Method 1
a power conversion unit configured to transmit, in a power transfer phase, wireless power generated based on magnetic coupling to a wireless power receiving device
Data Source
AI summary
The present specification provides a wireless power transmission device comprising: a power conversion unit configured so as to transmit, in a power transfer phase, wireless power generated on the basis of magnetic coupling to a wireless power receiving device; and a communication/control unit configured so as to perform an initial calibration for a power parameter prior to the power transfer phase, receive, from the wireless power receiving device, a first received power packet indicating the power received by the wireless power receiving device during the power transfer phase, and detect a foreign object by using the received power and a first power loss determined on the basis of the initial calibration.