Patent ID: 6417598
Filing Date: 2002-07-09
Classification: H01L,H02N

Abstract:
A power circuit for a resonant piezo-electric motor or actuator channel comprising a voltage source powering a circuit comprising an inductance in series with a capacitor (C) and a single switching element (T1) in parallel with the capacitor, and a means of control (O) of the switching element ensuring the cyclic closure thereof at a frequency close to the resonant frequency of the piezo-electric element, wherein the power circuit comprises a transformer (Tr) whose primary constitutes the inductance and whose secondary is linked to the piezo-electric exciter, this transformer exhibiting a small magnetic inductance at the primary, wherein the extra current absorbed at full load is always less than the no-load current, and wherein the sizing of this inductance and the choice of the capacitor are determined in such a way as to obtain switching in the vicinity of the voltage zero for the working frequency of the circuit.