Mobile communication terminal and circuit used for protecting charging of mobile communication terminal

Abstract

The invention discloses a mobile communication terminal and a circuit used for protecting charging of the mobile communication terminal. The circuit comprises a comparator, a first MOS (metal oxide semiconductor) tube, a second MOS tube, a diode, a first resistor and a second resistor, wherein an anode of the diode is connected with a drain electrode of the first MOS tube, a cathode of the diode is connected with a source electrode of the first MOS tube, the source electrode of the first MOS tube is further connected with a charging unit of the mobile communication terminal and a negative input end of the comparator, the drain electrode of the first MOS tube is further connected with a charging interface of the mobile communication terminal and a positive input end of the comparator, a grid electrode of the first MOS tube is connected with a drain electrode of the second MOS tube, a grid electrode of the second MOS tube is connected with an output end of the comparator, a source electrode of the second MOS tube is grounded through the second resistor, one end of the first resistor is connected with the grid electrode of the first MOS tube, and the other end of the first resistor is connected with the source electrode of the first MOS tube to protect the mobile communication terminal. By the mode, counterflow of current or voltage can be prevented, so that the mobile communication terminal is protected from damages.

Description

technical field [0001] The invention relates to the technical field of mobile communication terminals, in particular to a mobile communication terminal and a circuit for protecting charging of the mobile communication terminal. Background technique [0002] In the design of the mobile phone charging circuit in the prior art, the charging circuit has no reverse protection function for the voltage input of the charger, and there is no hardware method to prevent the battery of the mobile phone from feeding back the power to the charger. In actual use, the user may use the wrong charger to plug in. Since the mobile phone circuit does not have reverse voltage and reverse current protection functions, the power management chip of the mobile phone is easily damaged. Contents of the invention [0003] The technical problem mainly solved by the present invention is to provide a mobile communication terminal and a circuit for protecting charging of the mobile communication terminal,...

AI Technical Summary

Problems solved by technology

[0002] In the current mobile phone charging circuit design, the charging circuit has no reverse protection function for the charger voltage input, and there is no hardware method to prevent the battery of the mobile phone from feeding back the power to the charger.

In actual use, the user may use the wrong charger to plug in. Since the mobile phone circuit has no reverse voltage and reverse current protection functions, the power management chip of the mobile phone is easily damaged.

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