Title:
PIEZOELECTRIC ELEMENT CONTROL DEVICE, AND ULTRASONIC SENSOR
Document Type and Number:
WIPO Patent Application WO/2023/234168
Kind Code:
A1
Abstract:
This piezoelectric element control device comprises a drive circuit configured to supply a drive current to a primary-side coil of a transformer in order to drive a piezoelectric element connected in parallel to a secondary-side coil of the transformer, and a control circuit configured to control the drive circuit, wherein the control circuit increases a value of the drive current over time in at least a portion of a supply period of the drive current.
Inventors:
NAGAI TAKASHI (JP)
MATSUBARA HIDEKI (JP)
MATSUBARA HIDEKI (JP)
Application Number:
PCT/JP2023/019474
Publication Date:
December 07, 2023
Filing Date:
May 25, 2023
Export Citation:
Assignee:
ROHM CO LTD (JP)
International Classes:
G01S7/524; H04R3/00; H10N30/20; H10N30/80
Domestic Patent References:
| WO2014097479A1 | 2014-06-26 |
Foreign References:
| JP2002079181A | 2002-03-19 | |||
| JP2015171084A | 2015-09-28 | |||
| JPH03112300A | 1991-05-13 | |||
| JP2015190817A | 2015-11-02 | |||
| JPH07260925A | 1995-10-13 | |||
| US20190079173A1 | 2019-03-14 | |||
| JP2001212514A | 2001-08-07 | |||
| JPS60156585A | 1985-08-16 |
Attorney, Agent or Firm:
SANO PATENT OFFICE (JP)
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