Card-Reading Circuit With Dynamic Switching For Metal IC Cards
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Solution Overview
Problem
Existing double-sided card readers cannot read integrated circuit cards made of metal material due to short-circuiting issues when the card is inserted, as the metal card connects multiple terminals, preventing effective communication with the CPU.
Innovation Solution
A card-reading circuit with a connection module and communication control module that includes first and second connection units, where one communication control unit works at a time to prevent short circuits by disconnecting the card from the CPU when reading through either connection unit, ensuring the card reader can read both plastic and metal cards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a double-sided card reader is designed to read integrated circuit cards with chips on either board surface, then the card reader can read cards with chips on the first board surface through the first connection unit or on the second board surface through the second connection unit, but when a metal card is inserted and the chip is on the first board surface, the metal card causes short-circuiting of the terminals on the second board surface through the second connection unit, preventing successful card reading
Solution Approach 1:
The patent implements dynamic switching between the first communication control unit and the second communication control unit based on which board surface the integrated circuit chip is located on. The system transitions from a static dual-connection design to a dynamic single-active-connection design, where only one communication control unit is enabled at a time to prevent short-circuiting when metal cards are used.
Solution Approach 2:
The communication control units act as intermediaries between the connection units and the CPU. By introducing these control units that can selectively enable or disable communication paths, the system prevents direct electrical contact between metal card terminals and CPU terminals, thereby avoiding short-circuits while maintaining double-sided reading capability.
2Adaptability or versatility
If both communication control units are simultaneously connected to the CPU through separate connection units, then the card reader can potentially read from either board surface, but this simultaneous connectivity causes short-circuits when metal cards are inserted because the metal card creates electrical pathways between multiple terminals
Solution Approach 1:
The system dynamically activates only one communication control unit at a time based on the detected position of the integrated circuit chip. This dynamic configuration changes the electrical connectivity state to prevent harmful short-circuit effects while preserving the ability to read from either board surface.
Solution Approach 2:
The system takes preliminary action by detecting which board surface contains the integrated circuit chip before establishing full communication. Based on this detection, it preemptively enables only the appropriate communication control unit, preventing the short-circuiting effect from occurring in the first place rather than attempting to correct it afterward.
Data Source
AI summary
The present application belongs to the technical field of circuits. Disclosed are a card-reading circuit, a card reader, and a card-reading system. The card-reading circuit comprises a connection module and a communication control module. The connection module comprises a first connection unit and a second connection unit, and the communication control module comprises a first communication control unit and a second communication control unit. The first communication control unit is connected between a second end of the first connection unit and a reading end of a central processing unit, and the second communication control unit is connected between a second end of the second connection unit and the reading end of the central processing unit. At the same moment, one of the first communication control unit and the second communication control unit is operating. A card reader used by the card-reading circuit can realize the double-sided card reading of an integrated circuit card which is made of a metal material.