Wireless Charging Induction Circuit Metal Detection
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Solution Overview
Problem
Wireless charging systems face challenges in preventing inadvertent heating and potential fires when a metal substance is left on the charging pad, as they lack effective detection and protection mechanisms to differentiate between a metal object and a charging device.
Innovation Solution
A power transmission device with an induction circuit and processor that enters a wireless charging protection mode, measures current values, and releases the mode when no packet information is received from an external device, thereby preventing heating of metal substances by ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless charging is performed without metal detection, then charging speed and convenience are improved, but the risk of heating and fire from metal substances increases
Solution Approach 1:
The system performs metal detection before initiating wireless charging by measuring current values during a preliminary detection phase. If the current variation exceeds a threshold, the system identifies metal presence and prevents charging, thereby eliminating heating risk before it can occur while maintaining charging efficiency when safe
2Reliability
If metal detection mechanisms are added to wireless charging systems, then safety is improved, but device complexity increases
Solution Approach 1:
The wireless charging system uses its own induction circuit and current measurement capabilities to perform metal detection, rather than requiring separate detection hardware. The existing charging circuitry serves dual purposes: charging and metal detection, thereby improving safety without significantly increasing device complexity
Solution Approach 2:
The induction circuit is designed to perform multiple functions: wireless power transmission and metal substance detection. By measuring current characteristics during the charging process, the same hardware components are utilized for both charging operations and safety monitoring, reducing overall system complexity
3Measurement precision
If current measurement is performed continuously to detect metal substances, then detection accuracy is improved, but energy consumption increases
Solution Approach 1:
The system performs current measurement in periodic phases: an initial detection phase before charging starts, and optional monitoring phases during charging. Rather than continuous measurement, the system checks current values at specific intervals and states, maintaining detection accuracy while minimizing unnecessary energy consumption during safe charging operations
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
The solution effectively reduces the risk of heating and fire from metal substances on the charging pad by accurately distinguishing between the presence of a charging device and a metal object, maintaining safety and preventing device malfunction.
Implementation Method 1
an induction circuit configured to transmit a wireless power signal
Implementation Method 2
receive a signal from an external device
Data Source
AI summary
According to certain embodiments, a power transmission device comprises an induction circuit configured to transmit a wireless power signal through a charging pad and receive a signal from an external device; and at least one processor operatively connected to the induction circuit, wherein the processor is configured to: enter a wireless charging protection mode for wireless charging of the external device, measure a current value of the wireless power signal, and release the wireless charging protection mode when the packet information is not included in the signal transmitted from the external device and the measured current value or variation of the current value exceeds a threshold value.