NFC Tag Circuit Reset Signal Control for Battery-Powered Operation
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Solution Overview
Problem
Portable NFC devices without a power button face challenges in operating their internal systems using battery voltage, as they require an external NFC signal to release a reset state, and existing solutions do not enable operation without continuous NFC signal reception.
Innovation Solution
A portable NFC device incorporates a passive NFC tag circuit that generates a reset signal using battery voltage, allowing the internal system to operate even without an external NFC signal, by including a rectifier, regulator, demodulator, microcontroller unit, and internal system reset release control circuit to manage power and reset states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a portable NFC device uses a passive NFC tag circuit to generate operating voltage from RF signals, then the device can operate without a battery, but the device cannot maintain operation when no NFC signal is received
Solution Approach 1:
The power supply system is segmented into two independent sources: a passive NFC tag circuit for wireless power reception and a battery for stored power. Each serves specific functions - the NFC circuit handles communication and can provide initial power, while the battery ensures continuous operation. This segmentation allows the device to switch between power sources based on signal availability.
Solution Approach 2:
The battery is pre-charged and held in standby readiness before NFC signal reception is needed. The device is designed with the battery already prepared to take over immediately when NFC signals are unavailable, eliminating any operational gap. This preliminary preparation ensures seamless transition and continuous functionality.
2Ease of operation
If the internal system maintains reset state in response to reset signal, then the system can be controlled to operate only with external NFC signal, but the system cannot operate independently using battery voltage
Solution Approach 1:
The reset signal state is made dynamic rather than fixed. The system can transition between reset and non-reset states based on power source availability. When battery power is detected, the system dynamically switches from reset state (NFC-only mode) to operational state (independent mode), allowing adaptive behavior based on environmental conditions.
Solution Approach 2:
The system automatically detects the presence of battery voltage and self-manages the reset state transition without requiring external control. When the battery is installed and voltage is detected, the system autonomously releases the reset state and begins independent operation, eliminating the need for manual intervention or continuous external signaling.
3Device complexity
If the device requires external NFC signal to release reset state, then power management is simplified, but the device lacks functionality when NFC signal is not available
Solution Approach 1:
The battery acts as an intermediary power source between the NFC tag circuit and the internal system. It mediates the power transfer, allowing the system to operate independently when needed. The battery buffer enables the device to function without direct NFC signal connection, improving reliability while maintaining relatively simple power management architecture.
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
Enables the internal system of the NFC device to operate using battery voltage and maintain a reset release state, ensuring continuous functionality even when no NFC signal is received from an external device, enhancing usability and reliability.
Implementation Method 1
a rectifier that receives a system power on NFC signal from the external NFC device through an antenna and rectifies the received system power on NFC signal
Implementation Method 2
A portable NFC device incorporates a passive NFC tag circuit that generates a reset signal using battery voltage
Data Source
AI summary
Disclosed is an NFC device without a power button. The NFC device includes a battery that outputs a battery voltage, an internal system that includes a voltage receiving terminal for receiving the battery voltage and a reset signal receiving terminal for receiving a reset signal, and maintains a reset state in response to the reset signal having a first state, and an NFC tag circuit that generates the reset signal having the first state, and generates the reset signal having a second state in response to only a system power on command included in a system power on NFC signal transmitted from an external near field communication (NFC) device, in which the internal system releases the reset state in response to the reset signal having the second state, and then, generates a reset release holding signal using the battery voltage, and transmits the generated reset release holding signal to the NFC tag circuit, and the NFC tag circuit generates the reset signal maintaining the second state according to the reset release holding signal.