Patent ID: 6608426
Filing Date: 2003-08-19
Classification: H02N,H02P,Y02P

Abstract:
A drving device of a vibration type actuator which obtains a driving force by exciting an electro-mechanical energy converifon element by applying a periodic signal to the ciectro-mechanical energy conversion element, comprising:a D.C. power source; a plurality of switching elements connected to said D.C. power source; an inductance element connected to said phniity of switching elements to raise a voltage level applied thereto; and a drive control circuit which generates a switching pulse signal for operating said plurality of switching elements, wherein each of said plwulity of switching elements is operated by the switching pulse signal generated by said drive control cfrcuit and the switching pulse signal generated by said drive control circuit has a pulse width selected so as to set an amplitude mdc of a base frequency component to a total amplitude of higher harmonic wave frequency components of a voltage applied to said inductance element to be approximately maximum.