A power switch assembly for a capacitive load 10 which includes a common electrode 14 and first and second discrete electrodes 16, 18, includes a node n1 coupled to a voltage source Vcc for receiving power there from, a first switching device connected between the node n1 and ground, a second switching device connected between the node n1 and ground, and a dividing circuit connected between the node and ground. The dividing circuit includes an output terminal connected to the common electrode 14 of the capacitive load. The first switching device is coupled to the first electrode 16 of the capacitive load configured to control movement of the capacitive load 10 in a first direction. The second switching device is coupled to the second electrode 18 of the capacitive load configured to control movement of the capacitive load 10 in a second direction reverse to the first direction.