Proximity Payment Device Active Switch Control Circuit
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Solution Overview
Problem
Existing proximity payment devices face challenges with switching mechanisms that require modification of the RFID IC, making it difficult to achieve reliable and cost-effective switching, as well as providing a perfect on/off function due to size constraints and power/signal degradation issues.
Innovation Solution
A separate control integrated circuit is used to control the RFID IC, allowing for improved switch control without modifying the RFID IC, utilizing a low-capacitance design and integrating the switch into a contact interface module, which includes a sensor that can be actuated by the user to enable or disable the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the switch is integrated into the RFID IC, then the device size is reduced, but the manufacturing complexity and cost increase due to difficulty in attaching additional connections
Solution Approach 1:
The patent divides the device into separate functional modules: the RFID IC remains as a standalone component with its existing connections, while the switch is implemented as a separate element in the card body. This segmentation allows each component to be manufactured and tested independently, avoiding the complexity of integrating additional connections into the RFID IC while maintaining a compact overall device structure.
2Device complexity
If existing switching technologies are used, then the device complexity is reduced, but the reliability deteriorates due to imperfect on/off function and power/signal degradation
Solution Approach 1:
The patent introduces a control circuit as an intermediary between the switch and the RFID IC. This control circuit receives the switch signal and actively controls the connection between the antenna and RFID IC, ensuring reliable on/off switching. The control circuit compensates for the limitations of simple switching technologies by providing active signal conditioning and isolation, thereby achieving both simplicity and high reliability.
3Volume of moving object
If the RFID IC is made smaller, then the device size is reduced, but the difficulty of attaching antenna connections increases
Solution Approach 1:
The patent maintains the RFID IC as a separate, compact component with its own dedicated antenna connections, rather than attempting to integrate the antenna directly into the IC. This segmentation allows the RFID IC to remain small while the antenna connections are established through separate, reliable attachment points in the card body, avoiding the manufacturing difficulties of integrating additional connections into the IC itself.
Data Source
AI summary
An identification token includes a body and an RFID IC embedded in the body. An antenna is also embedded in the body and is coupled to the RFID IC. A control integrated circuit (CIC) is embedded in the body and coupled to the antenna. A sensor is embedded in the body and is coupled to the CIC. The sensor is actuatable by a user of the identification token.