Charging circuit, charging chip, mobile terminal and charging system

Abstract

The invention relates to a charging circuit, a charging chip, a mobile terminal and a charging system. The charging circuit comprises a first transistor, a second transistor and a control circuit. Thecontrol electrode of the first transistor is connected with a preset voltage end, a first electrode of the first transistor is connected with an energy storage device of equipment to be charged, anda second electrode of the first transistor is connected with a second electrode of the second transistor; the control electrode of the second transistor is connected with the control circuit, and thefirst electrode of the second transistor is connected with power supply equipment; the control circuit is used for controlling the working state of the second transistor; and when the first transistorand / or the second transistor are / is in a cut-off state, the difference value between the voltage of the preset voltage end and the maximum voltage when the energy storage device is fully charged is smaller than a preset threshold value. According to the embodiment of the invention, the electromigration phenomenon in the two transistors when charging is not carried out can be avoided, and the problem that the charging circuit generates heat seriously when charging is carried out is further avoided.

Description

technical field [0001] The present application relates to the technical field of charging, in particular to a charging circuit, a charging chip, a mobile terminal and a charging system. Background technique [0002] With the development of electronic equipment, users have higher and higher requirements for charging technology of electronic equipment. For example, it is necessary to shorten the charging time, reduce the heating phenomenon of charging, and the like. Among them, fast charging has become a development trend of charging technology. [0003] At present, electromigration phenomenon often occurs in the charging circuit used in fast charging, which causes the charging power of the electronic device to increase during charging, which in turn causes the electronic device to heat up seriously. Contents of the invention [0004] Based on this, it is necessary to provide a charging circuit, a charging chip, a mobile terminal and a charging system capable of avoiding e...

AI Technical Summary

Problems solved by technology

[0003] At present, in the charging circuit used for fast charging, electromigration phenomenon often occurs, which causes the charging power of electronic equipment to increase during charging, which in turn makes the electronic equipment seriously heated.

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