Waterproof method for USB interface and mobile terminal

Abstract

The invention discloses a waterproof method for a USB interface. A control circuit is arranged between the USB interface and a mainboard chip of a mobile terminal, and the control circuit is used for controlling a connected state of a channel between a working interface of the USB interface and a working interface of the mainboard chip. When an equipment connection event is judged to occur, the control circuit makes the channel between the working interface of the USB interface and the working interface of the mainboard chip conductive; when an equipment pull-out event is judged to occur, the control circuit cuts off the channel between the working interface of the USB interface and the working interface of the mainboard chip. When no equipment is connected, the channel between the working interface of the USB interface and the working interface of the mainboard chip is cut off, so that even if conducting liquid enters, the working interface of the USB has short circuit, and the conduction of the whole power circuit of the mobile terminal cannot occur to cause short circuit of the power circuit.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method for waterproofing a USB interface. The present invention also relates to a mobile terminal. Background technique [0002] With the development of science and technology, the functions of mobile terminals are becoming more and more diverse and powerful. For ordinary consumers, performance is no longer the bottleneck that restricts the use of mobile phones. On the contrary, the use environment of mobile phones is becoming more and more restrictive. Factors in cell phone use. [0003] For mobile terminal manufacturers, the anti-liquid function of mobile terminals has always been one of the technical goals they hope to achieve, because on the one hand, users hope to be able to use mobile phones smoothly in more application environments, such as bathing, rainy days, etc. and other special environments; on the other hand, users also hope that the mobile phone will not ...

AI Technical Summary

Problems solved by technology

[0005] 1. The mobile phone is sealed and waterproof as a whole. This method is currently the most commonly used waterproof method for mobile phones. The body is used for sealing, and equipment such as earphone holes, USB holes, button speakers, and handsets are sealed with gaskets. Plug caps should be used to seal components with exposed circuit contacts such as headphone jacks and USB jacks, but the plug caps are inconvenient to use during use, and the waterproof effect of the mobile phone is likely to fail due to the plug cap not being in place

[0006] 2. All components of the mobile phone use waterproof devices. This method sprays nano-scale waterproof films on the circuit boards of the various functional modules of the mobile phone, such as the main board, speakers, buttons, handsets, USB modules, and earphone modules, to achieve waterproof effects. The internal circuit of the mobile phone is protected, and the metal contacts in the exposed headphone jack and the USB data cable jack still need special protection, and it cannot be completely waterproof without auxiliary parts

However, if the plug cap is aged or lost, the mobile terminal will lose its waterproof function

In this case, if the circuit of the mobile terminal is immersed in a conductive liquid (such as water), it is likely to cause a short circuit between the working interfaces in the USB interface. At this time, the USB interface and the PMU (power management chip, It is a part of the motherboard chip) The power supply of the pins is directly connected, so it is easy to make the PMU on the motherboard chip misjudge it as a device connection, resulting in a short circuit of the internal circuit power supply and burning out the power supply chip

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