Wireless Charging Metal Detection Coil for Small Object Heating
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Solution Overview
Problem
Conventional metal object detection methods in wireless charging devices are inadequate for detecting small metal objects, leading to potential overheating and safety hazards due to high power levels.
Innovation Solution
A metal object detecting device comprising an object detection coil, a relay, and an object detector circuit, which operates independently of the power supply time to determine the presence of metal objects using oscillation signals, preventing interference and overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional primary side power detecting manner or resonance waveform comparison manner is used for metal object detection, then the detection can be performed during power supply, but small metal objects cannot be detected effectively when power is too high, causing metal objects to heat up to dangerous temperatures
Solution Approach 1:
The patent segments the operating cycle into distinct power supply time and object detection time, allowing separate optimization of each function. The object detection coil operates independently from the power transmission coil, enabling detection without interference from high power levels.
Solution Approach 2:
The patent introduces an object detection coil as an intermediary detection mechanism that operates at low power levels during object detection time. This intermediary system allows metal object detection without the harmful effects of high power transmission.
2Duration of action of moving object
If object detection coil operates during power supply time, then detection can be continuous, but the high power signal interferes with detection accuracy
Solution Approach 1:
The patent implements periodic action by alternating between power supply time and object detection time in cycles. The relay switches the object detection coil on during object detection time and off during power supply time, creating periodic detection intervals that ensure both continuity and accuracy.
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
Effectively detects metal objects near wireless charging devices, preventing interference and overheating, ensuring safe operation and avoiding damage to charging circuits.
Implementation Method 1
An oscillation signal is generated from the object detection coil and the object detector circuit as a basis for determining whether or not a metal object is close to the wireless charging device
Data Source
AI summary
A metal object detecting device for a wireless charging device is provided and includes an object detection coil, a relay and an object detector circuit. The wireless charging device has a transmitter coil, a first digital signal processor and a receiver coil. The object detection coil is disposed above the transmitter coil. The relay is connected to the object detection coil. The object detector circuit is connected to the relay and the first digital signal processor. The transmitter coil transmits a power signal to the receiver coil within a power supplying time. The relay is turned on during an object detection time such that an oscillation signal is generated from the object detection coil and the object detector circuit as a basis for determining whether or not a metal object is close to the wireless charging device.