Control method for implementing constant-current charging of battery

Abstract

The present invention discloses a control method to realize constant current battery charging, which comprises following procedures. Firstly, constant current charging is started. An input voltage of a power adjustment tube and a battery voltage are detected. Current grade for constant current charging is set. As the battery voltage achieves a voltage threshold of the constant current charging, the set current of the constant current charging is utilized to charge the battery and the battery voltage gradually increases. As the battery voltage is lower than a voltage of constant current charging completion, the battery is continuously charged. Otherwise, the constant current charging is finished. As a product of a difference between the input voltage of the power adjustment tube and the battery voltage with a present current grade of constant current charging is less than a set power consumption threshold of the power adjustment tube at the present current grade, the present constant current charging is kept. Otherwise, the charging current is increased until the charging is finished. The method shortens charging time, ensures the power consumption in the circuit power adjustment tube not more than a set value, protects the power adjustment tube and improves circuit operation reliability.

Description

technical field [0001] The invention relates to a control method for constant current charging of a battery. Specifically, in the constant current charging stage of the battery, the battery is not charged with a fixed constant current charging current, but the constant current is dynamically adjusted according to the change of the charging voltage of the battery. The charging current is characterized in that it takes into account both the charging time and the reliability of the circuit work. Background technique [0002] With the popularization of mobile electronic devices such as mobile phones and MP3 players, charging mobile phones and MP3 players through USB ports of computers has become an increasingly common application. Since the USB power supply is a regulated output current, the nominal value is 5V and the maximum current is 500mA. For example, the charging process of a lithium-ion battery is divided into three stages: trickle current, constant current, and pulse. ...

AI Technical Summary

Problems solved by technology

[0004] For a specific power tube, if the power consumption value is exceeded, there is a possibility of damaging the power tube

When the constant current charging current is set too small, it will prolong the charging time of the battery. When the constant current charging current is set too high, when the battery voltage is low, it may cause damage to the adjustment power tube.

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