SIM Card Switch Mechanism for Safe Power Shutdown
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Solution Overview
Problem
Dual mode phones with SIM cards face damage when the second SIM card is removed without prior battery removal, leading to potential damage and data loss due to insufficient power shutdown and lack of data pre-storing in conventional mechanisms.
Innovation Solution
An electronic device design featuring a housing, circuit board, cover, and switch, where the cover actuates the switch before SIM card removal, allowing sufficient time for power shutdown and data pre-storing on the circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the second SIM card is removed from the recess without removing the battery first, then the SIM card can be accessed, but the circuit board and SIM card may suffer damage due to insufficient power shutdown
Solution Approach 1:
The power shutdown action is performed in advance before the SIM card is physically removed. The control unit receives a shutdown instruction, controls the power supply module to stop providing power to the circuit board, and only then allows SIM card removal, preventing damage from sudden disconnection
Solution Approach 2:
The system uses feedback through user interaction (physical button press or software interface selection) to trigger the power shutdown sequence. The control unit monitors the shutdown status and only permits SIM card removal after confirming power has been cut, creating a feedback-controlled safety mechanism
2Reliability
If power is shut down during SIM card removal as in conventional mechanisms, then some protection is provided, but data cannot be pre-stored into the SIM card or circuit board before removal causing potential data loss
Solution Approach 1:
Data pre-storing is performed as a preliminary action before power shutdown. The control unit executes data backup from the circuit board to the SIM card or other storage medium before cutting power, ensuring data preservation while maintaining protection during the removal process
Solution Approach 2:
The SIM card removal process is segmented into distinct sequential steps: first data pre-storing, then power shutdown, and finally physical removal. This segmentation allows each critical function to be performed independently and completely before the next step, preventing data loss while maintaining safety
3Reliability
If a switch mechanism is added to control power shutdown before SIM card removal, then circuit board and SIM card damage is prevented, but device complexity increases
Solution Approach 1:
The system uses self-service by utilizing existing user interface elements (physical buttons already present in the mobile phone or software interface options) to trigger the power shutdown sequence. No separate dedicated switch is required, as the existing user input mechanisms serve the dual purpose of normal operation and SIM card removal control
Solution Approach 2:
The control unit and power supply module are designed with multi-functionality, serving both normal phone operation and SIM card removal control. The same control unit that manages overall phone functions also coordinates the power shutdown sequence, eliminating the need for separate dedicated control hardware
Data Source
AI summary
An electronic device comprises a housing, a circuit board, a cover and a switch. The housing comprises an opening receiving a card. The circuit board is disposed in the housing. The cover is disposed on the housing corresponding to the opening. The switch is disposed on the circuit board, wherein when the cover is moved, the cover actuates the switch to control the circuit board.