SIM Card Interface Decoupling Circuit for EX-Safe Operation
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Solution Overview
Problem
Modern radio modules with internal voltage regulation render existing SIM card interfaces obsolete, necessitating a new design to ensure EX-safe operation compliant with ETSI standards for safe data transmission and communication.
Innovation Solution
An electronic device with a radio module and interface device, featuring a decoupling circuit with operational amplifier and transistor, along with resistor elements for power limiting, ensures intrinsically safe operation of the SIM card by separating voltage specification from power supply, meeting ETSI standards and preventing power delivery in case of module failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If modern radio modules with internal voltage regulation are used, then device integration and efficiency are improved, but existing SIM card interfaces become obsolete and EX-safe operation cannot be ensured
Solution Approach 1:
The patent segments the voltage supply function into two independent parts: a voltage specification circuit that outputs a voltage signal indicating the required operating voltage, and a separate power supply unit that provides actual power based on this specification. This segmentation allows the system to adapt to different SIM card voltage requirements while maintaining EX-safe operation through controlled power delivery.
Solution Approach 2:
The patent introduces an intermediary decoupling circuit between the radio module and the SIM card. This circuit includes a voltage specification circuit that generates a voltage signal, a decoupling circuit that processes this signal, and a power supply unit that delivers power conditionally. The intermediary structure enables safe power delivery by mediating between the radio module's internal regulation and the SIM card's power requirements.
2Device complexity
If voltage specification and power supply are coupled, then circuit simplicity is maintained, but power delivery cannot be limited in case of module failure
Solution Approach 1:
The patent divides the power supply system into a voltage specification circuit and a separate power supply unit. The voltage specification circuit generates a voltage signal that indicates the required operating voltage, while the power supply unit receives this signal and conditionally provides power. This segmentation enables independent control of voltage specification and power delivery, allowing safety mechanisms to be implemented without excessive complexity.
Solution Approach 2:
The voltage specification circuit performs a preliminary action by generating a voltage signal that specifies the required operating voltage before the power supply unit delivers actual power. This preliminary voltage signal serves as a control input that enables the power supply unit to regulate its output, ensuring that power is delivered only when appropriate voltage specifications are met, thereby preventing unsafe power delivery in case of failures.
3Reliability
If resistor elements for power limiting are added to all connections, then EX-safe operation is ensured, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the power limiting function into the power supply unit rather than adding separate resistor elements to each connection. The power supply unit integrates the voltage specification input, decoupling circuitry, and power delivery control in a single consolidated component. This merging approach achieves EX-safe operation through unified power management while reducing the total number of discrete components compared to placing resistors on all connections.
Solution Approach 2:
The power supply unit is designed as a universal component that performs multiple functions: receiving voltage specifications, decoupling the control signal from power delivery, regulating power output based on the voltage specification, and providing EX-safe operation. By making the power supply unit multi-functional, the patent eliminates the need for separate resistor elements on each connection, as the power supply unit itself provides the necessary power limiting and safety control.
Data Source
AI summary
Disclosed is an electronic device comprising: a radio module designed to exchange information; an interface device designed to receive a SIM card, the interface device having a data interface, a clock interface, a reset interface and a supply interface designed to supply power to the SIM card; and a circuit board, on which the radio module and the interface device are arranged and electrically connected to one another; characterised in that the radio module has a voltage specification circuit and an associated voltage output, which voltage specification circuit is designed to specify an operating voltage for the SIM card, a fourth electrical connection having a decoupling circuit with power-limited output to the supply interface, which decoupling circuit is designed to decouple the voltage specification and energy supply of the SIM card from one another.