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Patent Searching and Data


Title:
PIEZOELECTRIC ACTUATOR, ABNORMALITY DETECTION CIRCUIT, AND PIEZOELECTRIC VALVE SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/135247
Kind Code:
A1
Abstract:
Provided is a piezoelectric actuator eliminating the need for replacing a fuse resistor of an abnormality detection circuit, having low component cost, and capable of detecting, during the operation of a device, only a piezoelectric element that does not operate normally. The piezoelectric actuator has: a piezoelectric element; a power supply for applying a voltage to the piezoelectric element; a drive circuit for driving the piezoelectric element such that, using pulse-shaped charging and discharging signals, the voltage is applied from the power supply to the piezoelectric element to charge the piezoelectric element and the charged charge is discharged; an abnormality detection circuit for detecting an abnormality due to insulation failure of the piezoelectric element; and a control unit for determining on the basis of an abnormality detection signal whether the piezoelectric element is normal or not. The abnormality detection circuit outputs the abnormality detection signal that detects, during charging, a time corresponding to a period from when current starts to flow through the piezoelectric element until the current stops flowing, wherein the piezoelectric element is determined to be abnormal when the time is a set time or more.

Inventors:
ITO TAKAFUMI (JP)
ARII HIRONORI (JP)
MATSUSHITA TADASHI (JP)
CHEE SZE KEAT (JP)
YANO TAKESHI (JP)
Application Number:
PCT/JP2017/046488
Publication Date:
July 26, 2018
Filing Date:
December 25, 2017
Export Citation:
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Assignee:
SATAKE ENG CO LTD (JP)
MECHANO TRANSF CORPORATION (JP)
International Classes:
H02N2/06; F16K31/02; H01L41/04; H01L41/09
Foreign References:
JP2008138682A2008-06-19
JP2003299371A2003-10-17
JP2002199748A2002-07-12
JP2008035273A2008-02-14
JP2017060356A2017-03-23
Attorney, Agent or Firm:
AIWA INTERNATIONAL PATENT AGENCY (JP)
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