Drive circuit for piezo-actuator

Abstract

PURPOSE: To simplify the structure and reduce the size of a piezo-actuator by charging and discharging the piezo-actuator by utilizing a resonance circuit composed of the inductance of a transformer and capacitance of the piezo- actuator. CONSTITUTION: When an electric current is made to flow to the primary coil 61A of a transformer and the current is discontinued when the current reaches a prescribed value, a fly-back voltage generated in the transformer by the abrupt change in the current is applied across a piezo-actuator 3. The waveform of the voltage is generated by the resonance between the secondary inductance of the transformer and capacitance component of the actuator 3 and, when the half wave of the voltage is utilized, the waveform of a conventional piezo- actuator dive circuit 6 can be approximated by setting the inductance and capacitance to appropriate values. Therefore, the need of the conventionally used short circuit signal generation circuit, mutual timing means, and high- voltage resistive switching element can be eliminated and the circuit 6 can be simplified in structure and reduced in size. COPYRIGHT: (C)1992,JPO&Japio

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Cited By (9)

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    FR-2907279-A1April 18, 2008Renault SasDispositif de commande d'un actionneur piezo-electrique ultrasonore.
    JP-2010507360-AMarch 04, 2010ルノー・エス・アー・エス超音波圧電アクチュエータ用制御装置
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    US-8154225-B2April 10, 2012Renault S.A.S.Control device for an ultrasonic piezoelectric actuator
    WO-03038918-A3April 08, 2004Arnaud Dal, Jean-Michel Muguet, Renault SaDispositif de commande d'un actuateur piezo-electrique
    WO-2008047018-A1April 24, 2008Renault S.A.SDispositif de commande d'un actionneur piezo-electrique ultrasonore