Wireless Charging Protection Circuit for NFC Modules
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communication devices, such as NFC modules, can be unintentionally supplied with excessive power during magnetic resonance-based wireless charging, leading to potential damage due to frequency band overlap with Alliance for Wireless Power (A4WP) systems.
Innovation Solution
An apparatus with a determination unit to sense rising power voltage and frequency, triggering a protection unit to control switching elements and impedance elements to block excessive power, thereby protecting the device from wireless charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the wireless communication device uses an antenna operating in the 13.56 MHz ISM band for NFC communication, then NFC communication functionality is enabled, but the device may unintentionally receive excessive power from A4WP wireless charging systems operating in the 6.78 MHz band due to frequency band proximity
Solution Approach 1:
The patent implements a determination unit that proactively detects the wireless charging state by sensing power voltage and frequency before excessive power can damage the NFC module. By detecting the characteristic frequency (6.78 MHz) and voltage rise of A4WP charging signals in advance, the system triggers the protection unit to block the antenna connection preemptively, preventing harmful power reception before it occurs
Solution Approach 2:
The patent introduces a protection unit with switching elements that acts as an intermediary between the antenna and the NFC module. This intermediary component selectively connects or disconnects the antenna from the NFC module based on the detected wireless charging state, thereby mediating the power flow and preventing excessive power from reaching the vulnerable NFC communication circuitry
2Reliability
If the device continuously monitors power voltage and frequency to detect wireless charging states, then protection accuracy is improved, but device complexity increases due to additional sensing and control circuits
Solution Approach 1:
The determination unit is designed to perform multiple functions using a unified detection mechanism. It simultaneously monitors both power voltage levels and frequency characteristics to identify wireless charging states, eliminating the need for separate detection circuits for each parameter. This multi-functional approach improves reliability through comprehensive monitoring while minimizing the increase in device complexity by consolidating sensing functions
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 prevents wireless communication devices from receiving excessive power during wireless charging, preventing damage and ensuring safe operation.
Implementation Method 1
a determination unit configured to sense a power voltage of a wireless communication device that transmits and receives a signal in a wireless manner by generating or reacting to a magnetic field
Implementation Method 2
a resonator including an antenna or an inductive element that generates or reacts to a magnetic field
Data Source
AI summary
Disclosed are an apparatus for protecting a wireless communication device and a wireless communication device comprising the same. The protection apparatus according to one embodiment comprises: a determination unit for detecting a power supply voltage of a wireless communication device for wirelessly transmitting and receiving a signal by generating a magnetic field or reacting therewith, and determining a wireless charging state from the outside when an increase in the power supply voltage, which is greater than or equal to a preset threshold, is detected; and a protection unit for protecting the wireless communication device from a power signal for wireless charging when the wireless charging condition is determined through the determination unit.