Charging method for setting charging current automatically and mobile terminal

Abstract

The invention discloses a charging method for setting a charging current automatically and a mobile terminal. The charging method comprises the following steps: a. a default charging current value of the mobile terminal is preset, the preset value is added gradually by a preset current increment to obtain a trial charging current of a charger of the mobile terminal, and the mobile terminal is charged on trial according to the trial charging current; b. the output voltage of the charger is judged whether to be smaller than a preset voltage threshold value when one preset current increment is added to the preset charging current; c. one current increment is subtracted from the current trial charging current value when the output voltage is judged to be smaller than the preset voltage threshold value, the obtained value is set as a standard charging current, and the mobile terminal is charged with the standard current. By means of the charging method for setting the charging current automatically, the mobile terminal can be charged with various USB chargers safely and effectively.

Description

Technical field [0001] The invention relates to the field of mobile terminal charging applications, in particular to a charging method for automatically setting a charging current and a mobile terminal. Background technique [0002] With the unification of mobile phone charger interfaces, most mobile phones and mobile handheld devices currently support USB chargers. Although the interface is uniform, the charging current of the charger is different. However, different chargers are currently not recognized on the mobile phone, and the charging current set on the mobile phone is the same, so there will be problems in actual use. [0003] During the charging process, the central processor sets a fixed charging current to the power management chip, so that the power management chip obtains the fixed current from the USB VBUS pin. Since the mobile terminal does not know the parameters of the charger, when the mobile terminal is not using the standard When the charger is equipped, ther...

AI Technical Summary

Problems solved by technology

Although the interface is unified, the charging current of the charger is different

However, different chargers cannot be identified on the mobile phone at present, and the charging current set on the mobile phone is the same, so there will be problems in actual use.

[0003] During the charging process, the central processing unit sets a fixed charging current to the power management chip, so that the power management chip obtains the fixed current from the VBUS pin of the USB. Since the mobile terminal does not know the parameters of the charger, when the mobile terminal does not use the When equipped with a charger, there may be a situation where the charging current set by the mobile terminal does not match the optimal charging current of the charger

[0004] For example, when the charging current of the mobile phone is set to 1.5A, and the user uses a 500mA charger to charge the mobile phone, it is very likely that the charger will be damaged, which may eventually cause an accident

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