SIM Card Connector Hot Plug Sequencing
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Solution Overview
Problem
Existing SIM card connectors in mobile terminals face the risk of short-circuiting when an SIM card is hot plugged or removed while the terminal is powered on, due to simultaneous connections with multiple metal contacts, which can damage the SIM card.
Innovation Solution
The SIM card connector features a card holder with a power supply terminal, a first terminal, and a second terminal, where the power supply terminal connects before the others during insertion and disconnects last during removal, along with an interruption detection module and power supply management module to control power supply, preventing short-circuits by sequencing connections and disconnections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the SIM card connector is kept energized during SIM card insertion or removal, then communication can be maintained, but the SIM card risks short-circuit damage due to simultaneous connection with multiple metal contacts
Solution Approach 1:
The patent applies preliminary action by arranging the power supply terminal, first terminal, and second terminal at specific positions along the insertion direction. During SIM card insertion, the power supply terminal makes contact first (before the SIM card is fully inserted), establishing power connection in advance. During removal, the power supply terminal disconnects last (after other terminals), maintaining power connection until the end. This sequencing prevents short-circuits while ensuring communication continuity throughout the hot plug process.
2Adaptability or versatility
If the terminal structure is designed for integrated form with built-in battery, then device integration is improved, but hot plug-in or removal of SIM card while powered on creates short-circuit risk
Solution Approach 1:
The patent resolves the contradiction between device integration and hot plug safety by implementing preliminary action through spatial sequencing of terminals. The power supply terminal is positioned to connect first and disconnect last, creating a protective sequence that allows hot plug operations in integrated devices without short-circuit risk.
Solution Approach 2:
The patent introduces intermediary elements (the first terminal and second terminal positioned between the power supply terminal and the SIM card contact) that mediate the connection sequence. These intermediary terminals ensure that power is established or disconnected only after or before other connections, respectively, enabling safe hot plug operations in integrated devices.
Data Source
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AI summary
An SIM card connector and a mobile terminal are disclosed. The SIM card connector comprises a card holder as well as a power supply terminal, a first terminal and a second terminal disposed within the card holder. When the SIM card is plugged, the power supply terminal connects with a power supply contact of the SIM card earlier than the first terminal, and the first terminal connects with the power supply contact earlier than the second terminal. The mobile terminal comprises an interruption detection module, a power supply management module and an SIM card connector. The power supply management module is configured to, when the SIM card is plugged in a powered-on state of the mobile terminal, supply power to the power supply terminal; the interruption detection module is configured to, if it is detected that neither of the levels at the first terminal and the second terminal is a predetermined level, transmit a first control signal to the power supply management module, and otherwise, transmit a second control signal to the power supply management module; and the power supply management module is further configured to stop supplying power to the power supply terminal when it is determined that the signal received changes from the second control signal into the first control signal. With the present disclosure, short-circuit of the SIM card when the SIM card is removed in a powered-on state of the mobile terminal can be prevented.