Charging method of charging circuit, charging circuit, charging chip and equipment

Abstract

The invention discloses a charging method of a charging circuit, the charging circuit, a charging chip and equipment. The charging circuit comprises a power tube unit which is used for charging a battery and is variable in size. The charging method comprises the steps of sampling the charging current of the power tube unit to the battery, wherein the sampling precision is inversely proportional tothe size of the power tube unit; if the charging current is equal to or less than a preset pre-judged current threshold, reducing the size of the power tube unit and continuously sampling the charging current of the power tube unit to the battery; and if the charging current is equal to or less than a preset cut-off current threshold, stopping charging the battery, wherein the cut-off current threshold is less than the pre-judged current threshold. According to the charging method provided by the invention, the sampling precision can be improved by reducing the size of the power tube unit, and the charging current obtained by sampling can be more accurate, so that the cut-off current threshold can be designed to be smaller, the battery is facilitated to be fully charged, and the technicalproblem of weak endurance of the battery is further solved.

Description

technical field [0001] The invention relates to the technical field of battery life, and more specifically, relates to a charging method for a charging circuit, a charging circuit, a charging chip and equipment. Background technique [0002] Batteries generally have three charging stages: pre-charging stage, fast charging stage, and constant voltage charging stage. In the last charging stage - the constant voltage charging stage, the charging voltage of the battery is constant and the charging current is slowly decreasing. Whether the charging current is less than the cut-off current threshold determines whether to stop charging the battery. When the charging current is lower than the cut-off current threshold, the charging system will judge that the battery is fully charged and stop charging. It can be understood that if the cut-off current threshold is designed to be smaller, the battery can be fully charged and have a stronger battery life. However, the sampling accura...

AI Technical Summary

Problems solved by technology

However, the sampling accuracy of the charging current in the prior art is relatively low. Limited by this, the cut-off current cannot be designed to be too small, otherwise the battery cannot be charged. Therefore, in the prior art, the threshold of the cut-off current can only be designed to be larger. As a result, there will be a problem that the battery is not fully charged and cannot have a stronger battery life.

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