Wireless Power Foreign Object Detection via Digital Ping
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Solution Overview
Problem
Wireless charging systems face challenges in efficiently determining the presence of foreign objects on the charging surface before initiating normal power transmission, which can lead to incomplete charging or safety issues.
Innovation Solution
The system performs digital ping operations to transmit low-level wireless power signals, allowing control circuitry to gather information on wireless power transmission efficiency, coupling coefficient, and coil inductance to detect foreign objects, and provides a user alert if none are present, ensuring safe and efficient charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If foreign object detection is performed during normal power transmission, then safety is improved, but charging time is increased and user experience deteriorates due to delayed detection
Solution Approach 1:
The system performs foreign object detection during the digital ping phase, which occurs before normal power transmission begins. By conducting detection operations in advance during the negotiation phase, the system identifies foreign objects before charging commences, eliminating delays during actual charging while maintaining safety through early detection
Solution Approach 2:
The charging process is divided into distinct phases: digital ping phase for foreign object detection and negotiation, followed by normal power transmission phase. This segmentation allows detection operations to occur independently during the ping phase without interfering with or delaying the subsequent charging phase, resolving the contradiction between detection accuracy and charging speed
2Productivity
If full power is transmitted immediately, then charging speed is improved, but safety risks increase due to inability to detect foreign objects
Solution Approach 1:
The system conducts foreign object detection during the digital ping phase before initiating full power transmission. This preliminary detection ensures that no foreign objects are present before high-power charging begins, eliminating safety risks while maintaining fast charging speed during the actual charging phase
Solution Approach 2:
The system rapidly completes foreign object detection during the brief digital ping phase, then immediately transitions to full power transmission without unnecessary delays. This approach rushes through the detection phase efficiently and skips directly to high-speed charging, achieving both safety and productivity goals
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 enables prompt detection of foreign objects during initial digital ping operations, preventing false alerts and ensuring timely user notification, thus ensuring reliable and efficient wireless power transfer.
Implementation Method 1
a wireless power transmitting device such as a charging mat wirelessly transmits power to a wireless power receiving device such as a portable electronic device
Implementation Method 2
The coil of the portable electronic device receives alternating-current wireless power signals from the wireless charging mat
Data Source
AI summary
A wireless power system has a wireless power transmitting device and a wireless power receiving device. The wireless power transmitting device may be a wireless charging mat or other device with a charging surface. The wireless power receiving device may be a portable electronic device receiving transmitted wireless power signals from the wireless power transmitting device while resting on the charging surface. During digital ping operations, low-power wireless power signals may be transmitted from the wireless power transmitting device. Information gathered during the digital ping such as wireless power transmission efficiency information, coupling coefficient information, Q-factor information, and coil inductance information may be used in determining whether a foreign object is present. Control circuitry in the transmitting device can cause the receiving device to present an alert for a user indicating that wireless power transfer operations are commencing in response to determining that no foreign object is present.