Multi-battery quick charging circuit and method

Abstract

The invention discloses a multi-battery quick charging circuit which comprises an electricity quantity detection unit, a charging judgment unit and a charging unit. The electricity quantity detection unit is used for detecting remaining electricity quantity of each battery, a first electricity quantity threshold value is preset by the charging judgment unit, and the charging judgment unit is used for comparing the detected remaining electricity quantity of each battery with the first electricity quantity threshold value; when the circumstance that multiple batteries need to be charged is judged by the charging judgment unit, the charging unit charges the batteries within a first time period through a first strategy; when the remaining electricity quantity of one or more of the batteries is equal to a second electricity quantity threshold value, the charging unit charges the batteries within a second time period through a second strategy; when the remaining electricity quantity of one or one of the batteries is equal to a third electricity quantity threshold value, the charging unit charges the batteries within a third time period through a third strategy, wherein the first time period, the second time period and the third period are in succession and are not overlapped.

Description

technical field [0001] The invention relates to a charging circuit and a charging method thereof, in particular to a multi-battery fast charging circuit and a charging method thereof capable of improving the charging efficiency of a plurality of batteries. Background technique [0002] The charging process of the battery can generally be divided into a PC (Pre-Charge, pre-charge) stage, a CC (Constant Current, constant current) stage, and a CV (Constant-Voltage, constant voltage) stage. [0003] The PC stage adopts the trickle method to charge, and the charging current in this stage is relatively small. When the power of the battery is very low, the use of trickle current can avoid damage to the internal structure of the battery due to the impact of high current, thereby protecting the battery, and trickle charging can also prevent the problem of overcharging. However, trickle charging takes too long, so it is usually used in combination with other charging methods (such as...

AI Technical Summary

Problems solved by technology

Taking dual-battery power supply as an example, two charging schemes are usually used in practice: one is to use two charging circuits to charge the two batteries respectively using the above-mentioned three-stage charging method. The advantage is that the charging speed is fast, and the disadvantage is that the cost is high. The temperature of the charging circuit is high; the second is to use a single charging circuit to charge two batteries in time

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