Wireless Power Transmitter Control for Foreign Object vs Coil Misalignment
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Solution Overview
Problem
Current wireless power transmission systems face challenges in distinguishing between the presence of foreign objects and coil misalignment, which can affect power transfer efficiency and safety.
Innovation Solution
A wireless power transmitter with a primary coil magnetically coupled to a secondary coil, equipped with a controller that receives information from the receiver to differentiate between foreign object presence and coil misalignment, allowing for controlled power transmission based on the detected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If wireless power transmission is performed using magnetic coupling between primary and secondary coils, then power transfer efficiency is improved, but the system cannot distinguish between foreign object presence and coil misalignment states
Solution Approach 1:
The patent segments the detection process into multiple independent measurement components: primary coil impedance measurement, secondary coil impedance measurement, and mutual inductance measurement. Each measurement provides specific information about the system state, allowing the controller to distinguish between foreign object presence and coil misalignment by analyzing the pattern of changes across all three parameters rather than relying on a single measurement.
2Reliability
If the system monitors power transmission parameters to detect foreign objects, then safety is improved, but false detection occurs due to coil misalignment
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors impedance and mutual inductance measurements, compares them against reference values, and adjusts power transmission accordingly. The system provides feedback to distinguish genuine foreign objects from misalignment conditions by analyzing the consistency and pattern of measurement deviations, reducing false detections while maintaining safety.
3Object-affected harmful factors
If the system stops power transmission upon detecting foreign objects, then safety is improved, but power transmission efficiency is reduced due to false stops from misalignment
Solution Approach 1:
The patent employs dynamic decision-making where the controller adjusts power transmission based on real-time analysis of multiple measurement parameters. Rather than using a static stop-or-continue approach, the system dynamically modulates power transmission levels according to the detected state, allowing continued operation in misalignment scenarios while stopping only when foreign objects are confirmed, thus maintaining productivity while ensuring safety.
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 accurate differentiation between foreign objects and misalignment states, ensuring safe and efficient wireless power transfer by adjusting power transmission accordingly.
Implementation Method 1
a primary coil that is magnetically coupled to a secondary coil of the wireless power receiver and transmits the wireless power
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
Data Source
AI summary
A wireless power transmitter according to an embodiment of the present specification comprises: a power converter comprising a primary coil magnetically coupled to a secondary coil of a wireless power receiver to transmit wireless power; and a controller for communicating with the wireless power receiver and controlling the wireless power transmission, wherein the controller receives first information relating to the secondary coil from the wireless power receiver, receives second information relating to the position information of the wireless power receiver from the wireless power receiver, and distinguishes a state in which a foreign material is present between the wireless power receiver and the wireless power transmitter, and a misalignment state of the primary coil and secondary coil, on the basis of the first information and second information.