Abstract: A driving circuit of a switch array for controlling one of a plurality of battery modules coupled in series, where: each battery module comprises a plurality of batteries coupled in series; the driving circuit is configured to generate corresponding driving signals to control corresponding switches in the switch array, such that one battery that is selected to be balanced, is coupled between positive and negative poles of a DC bus voltage; and a reference ground of the driving circuit is configured as the negative pole of the DC bus voltage.