Wireless Power Calibration for Precise 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 load conditions, leading to errors and difficulties in detecting foreign objects.
Innovation Solution
A wireless power transmitter and receiver system with a communication/control unit that performs initial and subsequent power calibration, using received power packets to adaptively adjust to changes in magnetic coupling and load conditions, and detects foreign objects through power loss analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power calibration is performed without considering changes in magnetic coupling and load conditions, then the calibration process is simple, but the measurement precision of transmitted and received power deteriorates
Solution Approach 1:
The patent implements dynamic power calibration by continuously monitoring magnetic coupling changes and load conditions, and adjusting calibration parameters in real-time. The system transitions from static calibration to dynamic calibration that adapts to changing operating conditions, thereby maintaining high measurement precision without requiring overly complex fixed calibration mechanisms.
Solution Approach 2:
The patent employs feedback mechanisms where the system monitors received power packets and actual power transfer conditions, then uses this information to adjust calibration parameters. This closed-loop feedback approach allows the system to maintain accurate power measurements by continuously correcting for changes in magnetic coupling and load conditions.
2Measurement precision
If adaptive power calibration is performed to account for environmental changes, then the measurement precision improves, but the complexity of the calibration process increases
Solution Approach 1:
The patent implements self-service calibration where the wireless power transmission system automatically performs power calibration without requiring manual intervention. The system autonomously monitors environmental changes, adjusts calibration parameters, and maintains accurate power measurements, thereby improving measurement precision while keeping the operation simple for users.
Solution Approach 2:
The patent performs preliminary power calibration before actual power transmission begins, and conducts subsequent calibration based on received power packets. This preliminary and periodic calibration approach ensures accurate power measurements while automating the process, reducing operational complexity for users.
3Measurement precision
If power calibration is performed frequently to maintain accuracy, then the measurement precision improves, but the loss of time increases
Solution Approach 1:
The patent implements periodic power calibration where the system performs calibration at predetermined intervals based on received power packets and operational conditions. This periodic approach maintains measurement precision by calibrating frequently enough to capture environmental changes, while avoiding excessive calibration that would waste time during stable operating conditions.
Solution Approach 2:
The patent performs partial calibration updates based on the magnitude of environmental changes detected. When changes are minor, the system applies smaller calibration adjustments, and only performs full calibration when significant changes occur. This selective calibration approach maintains accuracy while minimizing time loss.
4Measurement precision
If the system monitors received power packets continuously to detect foreign objects, then the detection precision improves, but the productivity of power transmission decreases
Solution Approach 1:
The patent implements continuous monitoring of received power packets during normal power transmission, allowing foreign object detection to occur concurrently with power delivery. This approach maintains high detection precision while minimizing impact on productivity, as the monitoring uses existing communication channels rather than requiring separate detection phases.
Solution Approach 2:
The patent performs partial foreign object detection by analyzing received power packets for anomalies indicating foreign objects. The system monitors power transfer characteristics continuously but only triggers full detection protocols when suspicious patterns are detected, thereby maintaining high detection precision while minimizing interruption to power transmission productivity.
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
Enhances the detection of foreign objects by accurately calibrating power transmission in response to environmental changes, ensuring stable and efficient power transfer.
Implementation Method 1
The wireless power transfer technique includes diverse methods, such as a method of transferring power by using magnetic coupling
Implementation Method 2
The magnetic resonance method is similar to the magnetic induction method in that is uses a magnetic field. However, the magnetic resonance method is different from the magnetic induction method in that energy is transmitted due to a concentration of magnetic fields on both a transmitting end and a receiving end, which is caused by the generated resonance.
Data Source
AI summary
The present invention relates to an apparatus and a method for performing power calibration in a wireless power transmission system. The present specification provides a wireless power transmission apparatus comprising: a power conversion unit configured 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 to perform an initial calibration for a power parameter prior to the power transfer phase, receive a first received power packet from the wireless power receiving device indicating the power received by the wireless power receiving device during the power transfer phase, and detect foreign matter by using the received power and a first power loss determined on the basis of the initial calibration. It is possible to adaptively respond to a newly changed wireless charging environment to calibrate transmission power and reception power, and it is possible to detect foreign matter more precisely by detecting a power loss on the basis of the calibrated transmission and reception power.