Patent ID: 8575975
Filing Date: 2013-11-05
Classification: B41J,H03K

Abstract:
1. A capacitive load drive circuit comprising: a stepped voltage drive circuit configured to cyclically charge a capacitive load to a selected high voltage during a ramp up and configured to discharge the capacitive load to a selected low voltage during a ramp down, comprising: a voltage supply circuit configured to sequentially supply to the capacitive load a variable voltage varying between each of a plurality of sets of rails, each set of rails having a rail high voltage and a rail low voltage, with the rail low voltage of the sequentially next set of rails essentially equal to the rail high voltage of the sequentially preceding set of rails, during the ramp up, and with the rail high voltage of the sequentially next set of rails essentially equal to the rail low voltage of the sequentially preceding set of rails during the ramp down; and an amplifier sequentially connected across the plurality of sets of rails, each respective rail high voltage and rail low voltage defining between them an output range of the amplifier.