Biometric Authentication Card Coil Coupling for NFC Power Sharing
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Solution Overview
Problem
Existing electronic cards with biometric authentication functions cannot simultaneously perform communication and power receiving efficiently due to the independent configuration of charging and NFC coils, limiting both communication and power receiving efficiencies.
Innovation Solution
An electronic card design that incorporates a communication antenna magnetically coupled with a receiving coil, sharing electromagnetic field energy in the same frequency band for both communication and power reception, utilizing a resonant capacitor and rectifying and smoothing circuit to enable simultaneous communication and power receiving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If independent charging coil and NFC coil are used, then device structure is simple, but communication and power receiving cannot be performed simultaneously and efficiency is limited
Solution Approach 1:
The patent merges the charging coil and NFC coil into a single integrated coil structure. The same coil serves dual purposes: receiving power through magnetic coupling with a charging device and performing NFC communication through magnetic coupling with an NFC reader. This integration eliminates the need for separate independent coils, enabling simultaneous power receiving and communication while simplifying the overall device structure.
Solution Approach 2:
The coil is designed with multi-functionality to perform both power receiving and NFC communication functions. By responding to magnetic fields in the same frequency band, the single coil can alternatively or simultaneously engage in power transfer from a charging device and data communication with an NFC reader, maximizing resource utilization and eliminating the trade-off between functional separation and integration.
2Reliability
If separate coils are used for charging and NFC, then each function can be optimized independently, but both functions cannot operate simultaneously
Solution Approach 1:
The patent combines power receiving and NFC communication functions into a single coil system that can operate simultaneously. The integrated coil maintains reliable power transfer for authentication while enabling concurrent NFC communication, ensuring both functions work together harmoniously rather than requiring sequential operation or separate physical components.
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 configuration allows for high communication and power receiving efficiencies, enabling the electronic card to perform authentication functions effectively while receiving power and communicating wirelessly.
Implementation Method 1
The communication antenna and the receiving coil share electromagnetic field energy resonating in the same frequency band for the short-range wireless communication, the electromagnetic field energy being shared because of magnetic coupling between the communication antenna and the receiving coil.
Implementation Method 2
The communication antenna and the receiving coil respond to a magnetic field in the same frequency band for the short-range wireless communication.
Data Source
AI summary
An electronic card with biometric authentication function includes a communication antenna for short-range wireless communication, a wireless communication IC, a receiving coil, a resonant capacitor, a rectifying and smoothing circuit, a biometric sensor, and a biometric authentication circuit. The communication antenna and the receiving coil respond to a magnetic field in the same frequency band for the short-range wireless communication. The wireless communication IC performs short-range wireless communication. The receiving coil receives power from the magnetic field in the same frequency band for the short-range wireless communication. The biometric authentication circuit causes the biometric sensor to operate by using the power received from the receiving resonant circuit. The communication antenna and the receiving coil share electromagnetic field energy resonating in the same frequency band for the short-range wireless communication, the electromagnetic field energy being shared because of magnetic coupling between the communication antenna and the receiving coil.