Title:
PIEZOELECTRIC ELEMENT DRIVING CIRCUIT AND FLUID CONTROL APPARATUS
Document Type and Number:
WIPO Patent Application WO/2017/073642
Kind Code:
A1
Abstract:
A piezoelectric element driving circuit (150) is provided with: a boosting circuit (22); a driving circuit (10); a waveform-shaping circuit (110); and an arithmetic circuit (111). The driving circuit (10) is provided with: a differential amplification circuit (12) with an LPF; an amplification circuit (13) with a BPF; an inverter (18); a resistor (R6); and a comparator (17). The driving circuit (10) applies a driving signal to a piezoelectric element (P) of a piezoelectric pump (23). The waveform-shaping circuit (110) extracts a voltage signal (Vsin) from the driving circuit (10). The waveform-shaping circuit (110) and the arithmetic circuit (111) calculate a voltage value (Vd) corresponding to a driving current flowing through the piezoelectric element (P) on the basis of the voltage signal (Vsin). The arithmetic circuit (111) outputs a control signal (Vfb) to the boosting circuit (22) on the basis of the voltage value (Vd). The boosting circuit (22) sets a value of a DC power supply voltage (Vc) on the basis of the control signal (Vfb), and outputs the DC power supply voltage (Vc).
Inventors:
OKAGUCHI KENJIRO (JP)
Application Number:
PCT/JP2016/081803
Publication Date:
May 04, 2017
Filing Date:
October 27, 2016
Export Citation:
Assignee:
MURATA MANUFACTURING CO (JP)
International Classes:
H01L41/04; B06B1/06; F04B9/00
Domestic Patent References:
| WO2009014148A1 | 2009-01-29 | |||
| WO2015004872A1 | 2015-01-15 |
Foreign References:
| JPH07107754A | 1995-04-21 | |||
| JPH03120768A | 1991-05-22 | |||
| JP2014514188A | 2014-06-19 | |||
| JP2007205173A | 2007-08-16 | |||
| JP2011083767A | 2011-04-28 | |||
| JP2011087455A | 2011-04-28 | |||
| JPH05299717A | 1993-11-12 |
Attorney, Agent or Firm:
KAEDE PATENT ATTORNEYS' OFFICE (JP)
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