Impedance detection method for charging line of load, chip, and mobile terminal

Abstract

The invention discloses an impedance detection method for a charging line, a chip and a terminal. A current-constant electronic load module is connected to the charging line of a normally connected load, the load is controlled to be in a no-charging state, a value of currents that the current-constant electronic load module takes from a charging device via a charging line and a potential difference between the two ends of the current-constant electronic load module are obtained, an equivalent serial impedance value of the charging line is calculated according to the current value and the potential difference, a charging strategy of the load is selected according to the equivalent serial impedance value, and charging is carried out. When the load is in the no-charging state, a power input interface of the load is connected to the current-constant electronic load module, the current-constant electronic load module take currents from the charging device via the charging line, the potential difference between the two ends of the current-constant electronic load module is detected and obtained, the impedance of the charging line can be calculated effectively, the load selects the charging strategy according to the impedance, and the charging efficiency and effect are improved.

Description

technical field [0001] The invention relates to the field of charging of mobile terminals, in particular to a method for detecting impedance of a charging circuit of a load, a chip and a terminal. Background technique [0002] At present, the charging current of mobile terminals has become larger, and the charging methods have become diverse, mainly including low-voltage fast charging and high-voltage fast charging. However, due to the variety of charging cables used by users, and the MICRO USB or type C interface is generally used as the charging input port for charging equipment, as the number of plugging increases, it is easy to cause wear and tear on the pins of the cable connector port, and the contact impedance becomes larger, making the impedance on the charging line unpredictable and affecting the implementation of a good charging strategy. For example, setting the appropriate charging voltage and charging current can achieve the purpose of short charging time, high...

AI Technical Summary

Problems solved by technology

[0003] In addition, due to the wear and tear of the charging port, the connector impedance becomes larger. If this impedance change cannot be detected and the charging is not controlled, the heat generation at this position will increase as the square multiple of the current, and the heat accumulation will cause damage to cables and mobile terminals. The charging interface of the charging port is overheated and deformed, emits a peculiar smell, and loses its own functions. If the consequences are serious, the user may be burned due to heat transfer, and the property may be burned, which may cause personal or property damage to the user.

[0004] There is no impedance detection function in the existing mobile terminals

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