Method and system for setting charging current in USB data transmission of mobile terminal

Abstract

The invention discloses a method and system for setting the charging current in USB data transmission of a mobile terminal. The method includes the following steps that first, the mobile terminal is connected with the charging current through a USB interface, and the number of changes of difference between the voltage of a D+ pin and the voltage of a D- pin of the USB interface in a preset period of time is acquired; second, a charging current value corresponding to the acquired number of changes of difference between the voltage of the D+ pin and the voltage of the D- pin of the USB interface is searched for in a preset current corresponding table; third, the charging current is reset according to the found charging current value. According to the method and system, by acquiring the number of changes of difference between the voltages of the USB pins in the data transmission process, the charging current in the data transmission process is adjusted according to the preset current corresponding table, so that the problem that when the mobile terminal performs USB data transmission, data transmission fails because of unstable voltage is avoided, and stable data transmission is guaranteed while the mobile terminal is charged through the USB.

Description

technical field [0001] The invention relates to the application field of mobile terminal charging, in particular to a charging current setting method and system for mobile terminal USB data transmission. Background technique [0002] In the prior art, the mobile terminal has generally been connected to the computer via USB, and the computer is used to download software (commonly known as "flashing") and transmit data for the mobile terminal through the computer; the process of flashing often takes several minutes or even longer. It is necessary to keep the mobile terminal in a powered state. If the mobile terminal is powered off during the flashing process, the mobile terminal will become unusable (commonly known as "bricking"). At present, although the mobile terminal will be automatically charged after being connected to the computer, if the mobile terminal is flashed, and a large amount of data is being transmitted at high speed on the USB line, if the charging current se...

AI Technical Summary

Problems solved by technology

[0004] In view of the above deficiencies in the prior art, the purpose of the present invention is to provide a charging current setting method and system for mobile terminal USB data transmission, aiming at solving the problem of data transmission failure due to voltage instability when the current mobile terminal performs USB data transmission. question

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