Switching-Based charger with time division charging control scheme for parallel charging

This paper presents a switching-based charger with a time division fast charging (TDFC) control to decrease circuit complexity and charging time for multiple batteries. Time division scheme can deliver a different energy amount to each battery to achieve battery voltage balance and remove the effect of the battery's parasitic resistor to prolong the charging time in constant current (CC) stage. To reduce charging time, the charging current in CC stage is regulated and the auxiliary switches are wholly turned on in constant voltage stage. Hence, the functionalities of battery voltage balance and fast charging can be achieved simultaneously. Experimental results are shown to verify the theoretical analysis of the proposed charger.