NFC Power-On Circuit for Buttonless Electronic Devices
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Solution Overview
Problem
Existing electronic devices require a physical power button or switch for power management, which can lead to issues such as accidental power-off or inability to power on without user intervention.
Innovation Solution
An electronic device equipped with a DC power supply, an NFC interface, and a voltage supply control circuit that allows the device to be powered on by a radio frequency (RF) signal and maintain power without subsequent RF signals, utilizing a near field communication (NFC) tag circuit for control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a physical power button or switch is used for power management, then the device can be powered on and off, but it is susceptible to accidental power-off and requires user intervention to power on
Solution Approach 1:
The patent replaces the mechanical power button system with an electromagnetic NFC-based power control system. The NFC interface detects NFC tags or readers to trigger power-on and power-off events, eliminating the need for physical buttons and reducing accidental operation while maintaining reliable power management through wireless identification.
2Device complexity
If the device is powered on by an RF signal, then the physical power button is eliminated, but the device may power off when the RF signal is no longer present
Solution Approach 1:
The voltage supply control circuit performs preliminary action by generating a voltage maintaining signal immediately when the first RF signal is detected, before the second RF signal arrives. This preliminary voltage maintenance ensures continuous power supply to the electronic circuit, preventing power-off during intervals between RF signals and extending the effective power-on duration.
3Reliability
If continuous power supply is maintained after initial RF signal activation, then uninterrupted operation is achieved, but energy consumption increases
Solution Approach 1:
The system uses periodic RF signals as triggers for power management. The voltage supply control circuit maintains power only during periods when RF signals are detected or when voltage maintaining signals are active, rather than providing continuous uninterrupted power. This periodic power management ensures operation continuity during needed periods while reducing overall energy consumption during idle intervals.
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 electronic device to remain powered on continuously once activated by an RF signal, eliminating the need for a physical power button and ensuring uninterrupted operation until the battery expires.
Implementation Method 1
an NFC tag circuit, wherein the NFC tag circuit includes a DC power supply configured to generate a DC voltage
Implementation Method 2
a DC power supply configured to generate a DC voltage
Data Source
AI summary
A near field communication (NFC) device includes a DC power supply configured to output a DC voltage, an NFC interface configured to generate a control signal in response to an NFC signal, and a voltage supply control circuit configured to supply the DC voltage to an electronic circuit in response to the control signal and maintain supply of the DC voltage to the electronic circuit in response to a voltage maintaining signal generated by the electronic circuit powered on by the DC voltage.