Wireless Charging Shielding Pattern Grounding Detection
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Solution Overview
Problem
Current wireless charging devices face challenges in ensuring the correct grounding of shielding patterns to effectively attenuate radiated electric fields, which is crucial for safety compliance with ICNIRP guidelines, as existing systems lack a reliable method to detect and correct deviations in electric potential.
Innovation Solution
A wireless charging device equipped with a detection circuit that checks if the shielding pattern is correctly grounded by measuring its electric potential and includes a control unit to nullify the alternating current if the shielding pattern is not properly grounded, ensuring safety by preventing electric field leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding pattern is added to attenuate radiated electric fields, then safety compliance with ICNIRP guidelines is improved, but device complexity increases
Solution Approach 1:
The patent implements a detection circuit that continuously monitors the electric potential of the shielding pattern and provides feedback to a control unit. When the shielding pattern is properly grounded (electric potential equals fixed potential), normal charging continues. When improper grounding is detected (electric potential differs from fixed potential), the control unit nullifies the alternating current. This feedback mechanism ensures safety compliance while maintaining operational simplicity.
2Reliability
If a detection circuit is added to monitor shielding pattern grounding, then safety is improved, but device complexity increases
Solution Approach 1:
The detection circuit measures the electric potential of the shielding pattern and feeds this information back to the control unit, which automatically responds by nullifying the alternating current when improper grounding is detected. This closed-loop feedback system enhances safety through automated monitoring and response.
Solution Approach 2:
The system performs self-diagnosis by automatically detecting grounding status through the detection circuit and self-corrects by nullifying the alternating current when improper grounding is detected, without requiring external intervention or complex manual safety systems.
3Object-affected harmful factors
If the alternating current is nullified when shielding pattern grounding is improper, then safety is improved, but productivity decreases
Solution Approach 1:
The detection circuit performs preliminary detection of grounding status before harmful electric field leakage can occur. By detecting improper grounding conditions in advance and preemptively nullifying the alternating current, the system prevents electric field leakage hazards before they can affect users or devices.
Solution Approach 2:
The continuous monitoring and automatic response mechanism ensures that the alternating current is nullified only when necessary (when improper grounding is detected), maintaining productivity during normal operation while ensuring safety when anomalies occur.
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 safety by ensuring the shielding pattern effectively attenuates radiated electric fields, thereby complying with ICNIRP guidelines and preventing potential exposure hazards.
Implementation Method 1
a driver circuit electrically connected to said charging antenna to inject an alternating current in said charging antenna such that said charging antenna produces an alternating magnetic field
Implementation Method 2
a shielding pattern (often called a re-radiation antenna) facing said charging antenna and conductively connected to a point having a fixed electric potential (typically ground). Such a shielding pattern makes it possible to decrease notably the radiated electric field
Data Source
Figure 1~2
Figure 3~4
AI summary
A wireless charging device comprises: - at least a charging antenna (10); - a driver circuit (22) electrically connected to said charging antenna (10) and injecting an alternating current (I) in said charging antenna (10) such that said charging antenna (10) produces an alternating magnetic field; - a shielding pattern (14) covering said charging antenna (10) and conductively connected to a point having a fixed electric potential (V0). The wireless charging device further comprises a detection circuit (24, 26, 28, 30) designed to detect whether an electric potential of said shielding pattern (14) is equal to said fixed electric potential (V0). A method for controlling a wireless charging device is also described.