Terminal Device Charging Interface Protection Against Non-Standard Cable Voltage Damage
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Solution Overview
Problem
The use of non-standard USB Type-C cables for charging terminal devices can result in higher voltage levels during quick-charging, potentially damaging the device's charging interface due to the smaller resistor size, which existing methods fail to adequately address.
Innovation Solution
A charging processing method that detects whether a connected USB Type-C cable is standard or non-standard, controlling the charger to provide standard voltage instead of quick-charging voltage when a non-standard cable is detected to prevent damage, and alerting the user to replace the cable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a non-standard cable with smaller resistor size is used for quick-charging, then charging speed is improved, but the voltage of the VBUS capacitor becomes excessively high which may damage the CC pin and charging interface
Solution Approach 1:
The patent applies preliminary action by detecting the cable type (standard or non-standard) before initiating quick-charging. The terminal device measures the resistance value of the cable's built-in resistor during connection establishment. Based on this preliminary detection, the system determines whether to enable quick-charging mode, thereby preventing excessive voltage damage before it occurs.
Solution Approach 2:
The patent implements feedback by continuously monitoring the cable's resistance characteristics and using this information to control the charging voltage output. The terminal device receives feedback about cable type through resistance measurement and adjusts the charging protocol accordingly - enabling quick-charging for standard cables while restricting to standard charging for non-standard cables, thus preventing voltage-related damage.
2Reliability
If the terminal device restricts charging voltage to standard levels, then the charging interface is protected from damage, but charging speed decreases
Solution Approach 1:
The patent applies dynamics by making the charging voltage level adaptive rather than fixed. The system dynamically adjusts between standard charging and quick-charging modes based on real-time detection of cable type. This dynamic adjustment allows the terminal device to optimize charging speed when using standard cables while automatically protecting the interface when non-standard cables are detected, resolving the contradiction between speed and reliability.
Solution Approach 2:
The patent implements parameter changes by modifying the charging voltage parameter based on cable type detection. The system changes the voltage parameter from standard levels to higher quick-charging levels when standard cables are detected, and vice versa. This parameter adaptation allows the system to achieve both fast charging capability and interface protection depending on the connected cable's characteristics.
Data Source
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AI summary
The present disclosure relates to a charging processing method, a terminal device and a storage medium. The charging processing method, applied to a terminal device, includes determining whether the terminal device is in a upstream facing port (UFP) mode; when the terminal device is in the UFP mode, determining whether a cable is connected to the terminal device; when the cable is connected to the terminal device, determining (S 101) whether the cable is a standard cable or a non-standard cable, wherein the terminal device is connected to a charging device via the cable; and when the cable is the non-standard cable, controlling (S102), via the cable, the charging device to provide a standard voltage of non-quickly-charging input voltage to charge the terminal device.