Battery charging circuit and battery charging method

Abstract

The invention belongs to the charging technical field and relates to a battery charging circuit and a battery charging method. The battery charging circuit provided by the invention is connected with a battery pack and specifically includes a power source conversion module, a control module and an isolation module, wherein the control module is connected with the power source conversion module and the battery pack respectively, and the isolation module is connected with the power source conversion module and the battery pack respectively; the circuit can be used in combination with the battery charging method, and the control module detects the virtual voltage of the battery pack and controls the power source conversion module to output constant current or constant voltage to the battery pack according to the relationship between the virtual voltage and a mode switching value; since the isolation module is additionally adopted, the circuit can judge residual electricity of the battery pack through detecting the virtual voltage under the situation that peripheral connection of the battery pack is not cut off, and therefore, the circuit has high detection accuracy; and the circuit can be more accurately switched to a constant current charging stage, and therefore, a charging process can be greatly accelerated, and charging time can be saved.

Description

technical field [0001] The invention belongs to the technical field of charging, and in particular relates to a battery charging circuit and a battery charging method. Background technique [0002] Lithium batteries are currently the most widely used rechargeable batteries. In the charging circuit of traditional lithium batteries, the charging protection chip is the core, which is used to control the charging current, charging voltage and judge whether the charging is over. Moreover, in order to prevent the safety problems caused by the overcharging of the lithium battery and prolong the service life of the lithium battery as much as possible, the method of constant current charging first and then constant voltage charging is generally adopted. [0003] However, in the charging process of traditional lithium batteries, the charging time of the constant voltage charging stage is long and the charging efficiency is low. The reason is that the remaining power of the lithium b...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a battery charging circuit, aiming to solve the problem that the existing lithium battery charging circuit has an inaccurate judgment on the remaining power of the lithium battery

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