Patent ID: 8217687

Claim:
A capacitive load driver comprising: a first switching element whose first end is configured to receive positive potential; a capacitive load arranged between a second end of the first switching element and the ground; a charge collecting capacitor whose first end is connected to a positive electrode terminal of the capacitive load; a voltage source connected between a second end of the charge collecting capacitor and the ground; and a controller of the first switching element and voltage source configured to: charge a parasitic capacitance of the capacitive load and the charge collecting capacitor, and thereafter, apply negative potential from the voltage source to the second end of the charge collecting capacitor thereby the parasitic capacitance is reversely biased and discharged to charge the charge collecting capacitor, and bring the output voltage of the voltage source to ground potential so that the charge collecting capacitor is discharged to charge the capacitive load, wherein the capacitance of the charge collecting capacitor is set to be greater than that of the parasitic capacitance.