Wireless Charging Coil Foreign Object Verification
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Solution Overview
Problem
Existing wireless charging technologies face challenges in consistently detecting foreign objects that can interfere with power transmission, relying solely on the detection performance of the power transmitting device.
Innovation Solution
An electronic device equipped with a processor, wireless power transceiver circuitry, and a charging circuit, which receives detecting power from an external device, determines if a reception voltage exceeds a predetermined value, and outputs foreign object detecting power to identify any intruding objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If foreign object detection is performed only by the power transmitting device, then the detection system remains simple, but the detection reliability is insufficient and cannot ensure consistent safety
Solution Approach 1:
The foreign object detection function is segmented between two devices: the power transmitting device performs initial detection, and the power reception device performs secondary verification detection. This division of detection responsibilities improves overall detection reliability while keeping each device's detection mechanism relatively simple.
Solution Approach 2:
The power reception device uses its battery and wireless power transceiver circuitry to actively verify the presence of foreign objects by receiving detecting power and measuring reception voltage. This feedback mechanism from the reception side provides an additional safety check that enhances detection reliability without requiring the transmitting device to become overly complex.
2Reliability
If the power reception device performs foreign object detection, then detection safety is improved, but the device complexity increases due to additional circuitry and processing requirements
Solution Approach 1:
The power reception device utilizes its existing wireless power transceiver circuitry and battery for dual purposes: both for receiving wireless power and for performing foreign object detection. By making these existing components multi-functional, the system achieves improved safety without adding significant complexity, as the same hardware serves multiple functions.
Solution Approach 2:
The power reception device performs self-verification of foreign objects using its own battery and circuitry. Instead of relying entirely on the transmitting device's detection, the reception device independently verifies safety by measuring reception voltage when receiving detecting power, enabling self-service detection that improves safety without requiring external complex detection systems.
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 solution enables the electronic device to detect foreign objects before initiating wireless charging, enhancing safety by independent detection and preventing accidents caused by foreign object intrusion.
Implementation Method 1
receiving, via wireless power transceiver circuitry, first detecting power from an external electronic device
Implementation Method 2
outputting, via a wireless power transfer (WPT) coil, foreign object detecting power based on the supplied power
Data Source
AI summary
An electronic device and method are disclosed. The electronic device includes: a battery, a wireless power transfer (WPT) coil, wireless power transceiver circuitry, a charging circuit, and a processor electrically connected to the wireless power transceiver circuitry and the charging circuit. The processor implements the method, including: receiving first detecting power from an external electronic device, determining whether a reception voltage generated by the received first detecting power is higher than a first predetermined voltage value, based on detecting that the reception voltage is higher than the first predetermined voltage value, supplying power from the battery to the wireless power transceiver circuitry, outputting via the WPT coil, foreign object detecting power based on the supplied power, and based on detecting an electrical change in the foreign object detecting power caused by presence of a foreign object, determining that an error has occurred.