Wireless Power Calibration Using Receiver Power Packets for FOD
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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 environmental factors, leading to errors in foreign object detection (FOD).
Innovation Solution
A method and apparatus for adaptive power calibration in wireless power transfer systems, where a communication/control unit receives power packets from a wireless power receiver to calibrate transmitted power and perform FOD, adjusting based on load changes and magnetic coupling variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power calibration is performed based on fixed transmitted power values, then the system is simple to operate, but measurement precision deteriorates due to changes in magnetic coupling and environmental factors
Solution Approach 1:
The system receives received power packets from the wireless power receiver and uses this feedback to calculate actual power transfer efficiency. The communication/control unit continuously monitors the difference between transmitted power and received power, adjusting calibration values based on real-time magnetic coupling conditions and environmental factors, thereby maintaining high measurement precision without excessive complexity
Solution Approach 2:
The system dynamically adjusts power calibration parameters based on detected magnetic coupling strength and environmental conditions. By changing the calibration parameters adaptively rather than using fixed values, the system achieves accurate power measurement across varying operating conditions while managing complexity through parameter-based adaptation
2Measurement precision
If foreign object detection is performed without power calibration, then the detection process is faster, but measurement precision deteriorates due to errors in transmitted and received power comparison
Solution Approach 1:
The system performs power calibration as a preliminary step before foreign object detection. By pre-calibrating the power transfer efficiency and establishing baseline transmitted and received power values, the system enables accurate FOD comparison without requiring repeated calibration during detection, thus maintaining high FOD accuracy while minimizing detection time
Solution Approach 2:
The system maintains continuous power transfer and monitoring during the calibration and detection process. By keeping the power transfer active and continuously measuring received power packets, the system achieves accurate FOD without interrupting the useful action of power transmission, reducing overall detection time while maintaining precision
3Reliability
If the system adapts to load changes and magnetic coupling variations, then reliability improves, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The wireless power transfer system performs self-calibration by automatically detecting magnetic coupling strength and environmental conditions, then adjusting its own power calibration parameters without external intervention. The communication/control unit autonomously processes received power packets and updates calibration values, improving reliability through adaptive self-adjustment while minimizing the need for complex external control mechanisms
Solution Approach 2:
The communication/control unit serves multiple functions: it manages power calibration, performs foreign object detection, and adapts to load changes and magnetic coupling variations. By consolidating these functions into a single multi-functional unit, the system achieves high reliability through comprehensive adaptability while managing overall device complexity through functional integration
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 enhanced foreign object detection, improving the reliability and accuracy of wireless power transfer by adapting to changes in the charging environment and load conditions.
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
Implementation Method 2
The magnetic induction method corresponds to a method transmitting power by using electric currents that are induced to the coil of the receiver by a magnetic field, which is generated from a coil battery cell of the transmitter, in accordance with an electromagnetic coupling between a transmitting coil and a receiving coil
Implementation Method 3
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 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.