Type-C USB Interface Shielding Housing Voltage Detection
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Solution Overview
Problem
Continuous charging through the CC pin of a Type C USB interface leads to power waste and security risks such as short circuits and corrosion, especially when the terminal is in a power-on state and liquid is present.
Innovation Solution
An electronic device with a Type C USB interface featuring a shielding housing disconnected from the ground and connected to resistors to generate a divided voltage, using a processor and comparators to determine the connection status and output signals only when an external device is connected, thereby preventing continuous charging and detecting liquid or stains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal continuously outputs pulse signal to the CC pin of Type C USB interface, then the interface can continuously detect external devices, but power is wasted and security risks (short circuit and corrosion) occur
Solution Approach 1:
The patent implements periodic detection by controlling the processor to output pulse signals to the CC pin only when needed (when external device connection needs to be detected), rather than continuously. The detection is triggered by specific events such as interface connection events or system state changes, creating a periodic rather than continuous operation mode that reduces power consumption while maintaining detection reliability.
2Reliability
If the terminal continuously outputs pulse signal to the CC pin, then device connection can be continuously monitored, but security risks such as short circuit and liquid corrosion occur
Solution Approach 1:
The patent applies preliminary anti-action by detecting the presence of liquid or stains in the interface before allowing continuous pulse signal output. The processor first detects whether the interface is dry or contains liquid/stains, and only enables continuous detection when the interface is confirmed dry. This preliminary check prevents harmful continuous operation in the presence of liquid, thereby preventing short circuits and corrosion while maintaining monitoring reliability when conditions are safe.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively alleviates power losses and security risks by controlling the output signal to the CC pin based on the connection status and presence of liquid, ensuring safe and efficient charging.
Implementation Method 1
the first resistor and the second resistor are configured to divide a voltage to generate a divided voltage and to apply the divided voltage to the shielding housing of the Type C USB interface
Implementation Method 2
when no external device is connected to the Type C USB interface, a level of the shielding housing of the Type C USB interface is a first level, where the first level is greater than 0; when the external device is connected to the Type C USB interface, the processor outputs a signal to a CC pin of the Type C USB interface
Data Source
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AI summary
This application provides a method for controlling a Type C USB interface, applied to an electronic device. The method includes: disconnecting a shielding housing of a Type C USB interface (J1) from the ground of an electronic device, obtaining a level (V12) of the shielding housing, determining, based on the obtained level (V12), whether an external device is plugged into or unplugged from the Type C USB interface (J1); outputting a signal to a CC pin of the Type C USB interface (J1) when it is determined that the external device is plugged into the Type C USB interface (J1) of the electronic device; and stopping outputting the signal to the CC pin of the Type C USB interface (J1) when it is determined that the an external device is unplugged from the Type C USB interface (J1) of the electronic device or that no the external device is connected to the Type C USB interface (J1). According to the foregoing control method, problems of terminal power consumption and security risks can be alleviated.