Method for distinguishing metal objects from heating cup and wireless charging device using the same
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Solution Overview
Problem
Existing wireless charging systems face challenges in accurately distinguishing metal objects from heating cups, leading to unintended heating and potential safety hazards, as they rely on quality factor (Q factor) measurements that can overlap with those of metal objects.
Innovation Solution
A method involving a wireless charging device that uses a series of testing metal objects to record unique Q factor and current ranges, allowing for the identification of a heating cup by finding a third range with minimal overlap, enabling precise power adjustment to prevent accidental heating of foreign metal objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Q factor measurement is used to identify heating cups, then charging efficiency is improved, but safety deteriorates due to overlap with metal objects
Solution Approach 1:
The identification process is segmented into multiple stages: initial Q factor measurement followed by additional verification measurements at different time points. This multi-stage segmentation allows the system to distinguish heating cups from metal objects by analyzing Q factor patterns over time, resolving the contradiction between charging efficiency and safety.
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring Q factor changes and comparing them against predefined thresholds and patterns. The feedback loop enables real-time adjustment of power delivery, stopping heating when metal objects are detected while maintaining efficient charging for heating cups, thus resolving the safety-efficiency contradiction.
2Power
If power output is increased to 24W for heating cups, then heating effectiveness is improved, but risk of harmful effects increases for metal objects
Solution Approach 1:
The power output is made dynamic rather than static. The system adjusts power delivery in real-time based on continuous Q factor monitoring, enabling high power (24W) for heating cups while automatically reducing or stopping power for metal objects. This dynamic adjustment resolves the contradiction between heating effectiveness and safety.
Solution Approach 2:
The system changes operational parameters (power level, monitoring frequency) based on detected object type. By transitioning between different power states controlled by Q factor analysis, the system achieves high power for legitimate heating cups while preventing harmful heating of metal objects, resolving the power-safety contradiction.
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 effectively differentiates heating cups from other metal objects, ensuring safe and appropriate power output, preventing overheating and ensuring correct charging of heating cups while maintaining standard charging for electronic devices.
Implementation Method 1
heat is generated through electromagnetic interaction with the metal powder
Implementation Method 2
measuring a quality factor (Q factor) in a transmitter of the charger
Data Source
AI summary
A method for distinguishing metal objects from a heating cup and a wireless charging device using the method are disclosed. The wireless charging device includes a housing, a power unit, a power transmitter, a current measuring unit, a Q factor measuring unit, a controller, and a temperature detector. The wireless charging device can distinguish metal objects from a heating cup by both current in the power transmitter and the Q factor of the power transmitter. If the heating cup is confirmed, a higher power will be provided to a metal heating layer of the heating cup to heat the liquid in the heating cup; otherwise, a lower power will be provided to charge general electronic devices having a power receiving element.