Fast charging power supply management circuit and charging control method

Abstract

The invention relates to a fast charging power supply management circuit and a charging control method, and the circuit comprises a battery, a sampling circuit, a control module, a multiplying power control circuit, and a charging management module. The sampling end of the sampling circuit is electrically connected with the battery, and the output end of the sampling circuit is electrically connected with the sampling input end of the control module; the control output end of the control module is electrically connected with the control input end of the multiplying power control circuit, and the enabling end of the control module is electrically connected with the enabling end of the charging management module; the output end of the multiplying power control circuit is electrically connected with the control end of the charging management module; the battery connecting end of the charging management module is electrically connected with the battery. According to the embodiment of the invention, the charging rate of the battery can be automatically reduced before the voltage at the two ends of the battery reaches the full-charge voltage, the battery can be fully charged quickly and really, the endurance time of the battery can be prolonged, and the situation that the battery cannot be fully charged really due to overhigh floating voltage caused by overhigh charging rate during quick charging of the battery is avoided.

Description

technical field [0001] The present application relates to the field of electronic information technology, in particular to a fast charging source management circuit and a charging control method. Background technique [0002] With the rapid development of battery technology, fast charging of batteries has been widely used. In recent years, in wearable products, such as earphones, watches, bracelets, etc., the application of fast charging technology can greatly improve the user experience. [0003] The current problem is: when charging with high rate, such as 2C, 3C..., due to the internal resistance R of the battery, there will be a floating voltage U=I*R during charging. The larger the current I, the larger the floating voltage U will be. At this time, I=2C or 3C, 4C..., the higher the charging rate, the greater the floating voltage U. Among them, C represents the capacity of the rechargeable battery in the field of battery charging, and is used to represent the discharg...

AI Technical Summary

Problems solved by technology

[0003] The current problem is: when charging with high rate, such as 2C, 3C..., due to the internal resistance R of the battery, there will be a floating voltage U=I*R during charging. In the case of a certain R, The greater the current I, the greater the float voltage U will be

The floating voltage will cause the battery voltage detection to be falsely high, which will cause the battery to be fully charged, and the charging management chip (IC) will stop charging, and eventually the battery cannot be fully charged, which will affect the battery life.

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