Mobile Terminal SIM Card Voltage Identification via Incremental Power Supply
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Solution Overview
Problem
Existing mobile terminals face challenges in identifying and supporting SIM cards with different operating voltages, leading to compatibility issues and potential damage from mismatched power supplies.
Innovation Solution
A method and mobile terminal design incorporating a power supply module and a power management module with preset reference voltages, incrementally increasing power supply from 1.8V to 3V to 5V to match the SIM card's operating voltage, ensuring safe identification and operation of SIM cards compatible with various voltage standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the power supply module supplies high voltage (5V) to the SIM card initially, then the SIM card can operate at higher voltage standards, but the SIM card may be burned due to voltage mismatch
Solution Approach 1:
The power management module performs preliminary voltage detection by sequentially applying different reference voltages (1.8V, 3V, 5V) to the SIM card before normal operation. This preliminary action identifies the SIM card's voltage compatibility status, preventing subsequent voltage mismatch damage while ensuring broad voltage standard support
Solution Approach 2:
The system dynamically changes the power supply voltage parameter based on detected SIM card characteristics. By adjusting the voltage from multiple reference levels (1.8V, 3V, 5V) according to the SIM card's response, the system optimizes voltage compatibility while preventing voltage-induced damage
2Device complexity
If the power supply module uses a single reference voltage, then the power supply circuit is simple, but the mobile terminal cannot identify SIM cards with different operating voltages
Solution Approach 1:
The power supply function is segmented into multiple discrete reference voltage levels (1.8V, 3V, 5V) that can be independently selected and applied. This segmentation enables the system to test different voltage compatibility statuses sequentially, achieving broad SIM card support while maintaining a relatively simple power supply architecture
Solution Approach 2:
The power management module is designed with multi-functionality to handle multiple voltage standards (1.8V, 3V, 5V) through a single integrated circuit. This universal design enables the mobile terminal to identify and support SIM cards with different operating voltages without requiring separate power supply circuits for each voltage standard
Data Source
AI summary
A method of indentifying SIM card of a mobile terminal supports at least two SIM cards and comprises a power supply module and a power management module, wherein the power management module has different preset reference voltages and supplies power to the SIM cards respectively according to a comparison result of the reference voltages and operating voltages of the SIM cards. Via the preset reference voltages to the power management module, when the SIM card is inserted into the mobile terminal, the mobile terminal control the power supply module to supply power to the SIM cards, and the power management module determines whether the reference voltage matches the operating voltage of the SIM card, according to the comparison of the reference voltage and the operating voltage of the SIM card, so as to determine whether the SIM card can be indentified.