NFC Resonance Unit Voltage Oscillation Control

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Solution Overview

Problem

Near Field Communication (NFC) devices face errors and potential damage due to electromagnetic wave collisions with external NFC readers, causing antenna voltage oscillations and communication disruptions.

Innovation Solution

An NFC device with a resonance unit that emits electromagnetic waves and an NFC chip to measure antenna voltage, controlling the resonance unit to stop emitting waves when voltage oscillations occur, switching from reader mode to card mode to prevent damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the NFC device operates in reader mode and emits electromagnetic waves continuously, then communication with external NFC cards is enabled, but antenna voltage increases to damaging levels when external NFC readers are present

Engineering Contradiction:

Improvecommunication capabilityVSAvoidantenna voltage damage

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The NFC chip performs preliminary measurement of antenna voltage before and during electromagnetic wave emission. When voltage oscillation exceeding a threshold is detected, the system preemptively switches from reader mode to card mode, preventing the harmful voltage increase from reaching damaging levels.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The NFC chip continuously monitors antenna voltage during operation and uses this feedback to dynamically control the resonance unit. When voltage oscillation is detected, the system adjusts its operation by switching modes, creating a closed-loop control mechanism that prevents damage while maintaining communication capability.

Inventive Principle:

Principle #23Feedback

2Reliability

If the NFC device switches from reader mode to card mode when voltage oscillation is detected, then device damage is prevented, but communication continuity is interrupted

Engineering Contradiction:

Improvedevice protectionVSAvoidcommunication continuity

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent converts the harmful voltage oscillation signal into a useful mode-switching trigger. Instead of viewing the oscillation solely as a damage indicator, the system uses it to automatically transition to card mode, where the same oscillation becomes a normal operational phenomenon, thus preventing damage while maintaining communication capability.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The system changes the operational parameter by switching between reader mode and card mode based on detected voltage oscillation. This parameter change allows the same physical hardware to operate safely under different conditions, preventing damage when external readers are present while maintaining communication functionality.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If the NFC device continuously monitors antenna voltage, then external NFC readers can be detected, but device complexity increases

Engineering Contradiction:

Improvevoltage detection accuracyVSAvoidmonitoring system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The NFC chip performs multiple functions using the same hardware resources: it processes communication data, measures antenna voltage, detects oscillation patterns, and controls mode switching. This multi-functionality eliminates the need for separate dedicated monitoring hardware, reducing overall device complexity while maintaining precise voltage detection capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The NFC chip monitors its own antenna voltage and controls its own operational mode without requiring external monitoring systems. This self-service approach integrates the monitoring function within the existing chip architecture, avoiding additional complexity from separate monitoring hardware while ensuring accurate detection.

Inventive Principle:

Principle #25Self-service

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

Prevents antenna voltage increases and communication errors by differentiating voltage changes caused by NFC readers from those caused by NFC cards, effectively preventing device damage while maintaining communication stability.

Implementation Method 1

a resonance unit (100a) emitting an electromagnetic wave to communicate with an external NFC card

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

An antenna voltage is generated in a resonance unit of an NFC device, when the NFC device emits an electromagnetic wave

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS9613238B2Near field communication device and electronic system having the same

Publication Date: 2017.04.04 SAMSUNG ELECTRONICS CO LTD

AI summary

A Near Field Communication (NFC) device, system, and method are disclosed. The NFC device includes a resonance unit configured to emit a first electromagnetic wave to communicate with an external NFC card in a reader mode, and an NFC chip configured to measure an antenna voltage generated by the resonance unit while the resonance unit emits the first electromagnetic wave, and configured to control the resonance unit to stop emitting the first electromagnetic wave when a magnitude of the antenna voltage oscillates.