Resonant LC Filtering for Shared Wireless Charging and NFC Coils
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Solution Overview
Problem
Interference occurs between wireless charging and NFC/RFID signals due to different frequencies, affecting the stability of electronic devices and user experience.
Innovation Solution
Incorporating resonant circuits between the wireless charging and NFC/RFID circuits and coils, tuned to specific frequencies to prevent signal interference, using simple passive devices like inductors and capacitors to isolate signals, thereby reducing interference between circuits processing signals at different frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resonant circuits are added between wireless charging and NFC/RFID circuits, then signal interference is reduced, but device complexity increases
Solution Approach 1:
The patent introduces resonant circuits as intermediary components between the wireless charging circuit and NFC/RFID circuit. These resonant circuits act as frequency-selective mediators that allow desired signals to pass while blocking interfering signals at different frequencies, thereby reducing signal interference without requiring complete circuit isolation
Solution Approach 2:
The patent utilizes the resonant frequency parameter of LC circuits to create frequency-selective filtering. By tuning the resonant frequency of each resonant circuit to match its corresponding signal frequency, the system enables different frequency signals to coexist in the same coil without mutual interference, effectively managing signal stability through parameter optimization
2Reliability
If resonant circuits are used to filter signals, then interference is reduced, but manufacturing cost increases
Solution Approach 1:
The resonant circuits serve as intermediary filtering components that can be integrated into the existing circuit board layout. By positioning these circuits at strategic points between the wireless charging and NFC/RFID circuits, the patent achieves signal isolation using standard electronic components that are relatively inexpensive and easy to manufacture
Solution Approach 2:
The patent employs standard inductors and capacitors with specific parameter values to create resonant circuits at the required frequencies. These passive components are mass-produced and readily available, making the solution cost-effective compared to using active filtering components or complex isolation mechanisms
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 effectively reduces interference between wireless charging and NFC/RFID signals, enhancing the stability and user experience of electronic devices by using resonant circuits to isolate signals of different frequencies.
Implementation Method 1
A resonant circuit may be disposed between the first circuit and the coil... A resonant circuit disposed between the first circuit and the coil may be configured to prevent the second signal from passing
Data Source
AI summary
An electronic device, including a first circuit, a second circuit, a coil, and one or more resonant circuits. The first circuit may transmit a first signal through the coil, and the second circuit may transmit a second signal through the coil. Frequencies of the first signal and the second signal are different. The resonant circuit may be disposed between the first circuit and the coil to prevent the second signal from passing or disposed between the second circuit and the coil to prevent the first signal from passing, so as to prevent the first signal from interfering with the second circuit or prevent the second signal from interfering with the first circuit.