NFC Circuit Protection in Wireless Power Systems
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Solution Overview
Problem
In non-contact power-supply systems, the rapid increase in charging voltage can lead to the destruction of NFC circuits during wireless power transmission, as existing technologies fail to timely block power application to these circuits when a predetermined voltage threshold is exceeded.
Innovation Solution
A communication device with a control unit that receives power transmission information from a power transmission device, allowing it to control power application to the NFC circuit, blocking power when the voltage exceeds a threshold to prevent circuit destruction, and using a switch to disconnect the NFC coil from the NFC circuit during high-power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If wireless power transmission is performed using high power radio waves, then power transmission efficiency is improved, but NFC circuit destruction risk increases
Solution Approach 1:
The control unit receives power transmission information from the power transmission device before wireless power transmission begins. Based on this advance information, the control unit proactively controls the switch to disconnect the NFC coil from the NFC circuit before high-power transmission starts, preventing circuit destruction while maintaining power transmission efficiency
Solution Approach 2:
A switch is introduced as an intermediary component between the NFC coil and the NFC circuit. The switch acts as a controllable disconnect mechanism that can isolate the NFC circuit from high-power radio waves during wireless power transmission, resolving the contradiction between power transmission efficiency and circuit safety
2Device complexity
If power application to NFC circuit is blocked only after voltage threshold is exceeded, then simple control logic is maintained, but NFC circuit destruction may occur due to delayed response
Solution Approach 1:
The control unit receives power transmission information in advance from the power transmission device and proactively disconnects the NFC coil from the NFC circuit before high-power transmission begins. This preliminary action eliminates the need for complex real-time voltage monitoring and threshold detection, maintaining simple control logic while ensuring reliable circuit protection
Solution Approach 2:
The control unit utilizes feedback from the power transmission device (power transmission information) to determine when to disconnect the NFC circuit. This feedback mechanism enables timely and reliable protection without requiring complex voltage detection and threshold comparison logic in the communication device
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 prevents the destruction of NFC circuits by controlling power application based on received power transmission information, ensuring safe charging and communication operations within non-contact power-supply systems.
Implementation Method 1
a wireless power transmission device (a power transmission device) that performs power transmission (power supply) in a non-contact (wireless) manner
Implementation Method 2
terminal devices having a function of short-range wireless communication based on near field radio communication (NFC)
Data Source
AI summary
A communication device includes: a short-range wireless communication unit that performs short-range wireless communication; a communication unit that receives power transmission information about power transmission transmitted from a power transmission device that transmits power in a non-contact manner; and a control unit that controls power application to the short-range wireless communication unit in a case that the communication unit has received the power transmission information.