JPS573496A - Piezoelectric element drive device - Google Patents

Piezoelectric element drive device

Info

Publication number
JPS573496A
JPS573496A JP7699580A JP7699580A JPS573496A JP S573496 A JPS573496 A JP S573496A JP 7699580 A JP7699580 A JP 7699580A JP 7699580 A JP7699580 A JP 7699580A JP S573496 A JPS573496 A JP S573496A
Authority
JP
Japan
Prior art keywords
piezoelectric ceramic
counter
drive signal
piezoelectric element
resonance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP7699580A
Other languages
Japanese (ja)
Inventor
Takenobu Isaka
Masaaki Kobayashi
Koichi Ikata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP7699580A priority Critical patent/JPS573496A/en
Publication of JPS573496A publication Critical patent/JPS573496A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/007—Protection circuits for transducers

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

PURPOSE:To enable to prevent the excessive oscillation of a piezoelectric ceramic due to resonance, by providing a negative feedback circuit adding a counter electromotive force produced through a mechanical displacement of a piezoelectric element to a drive signal after converting it into a damping voltage, and a drive circuit. CONSTITUTION:A drive signal of a drive source 7 is amplified at a DC amplifier 9 via, e.g., an adder 8, and it is applied to a piezoelectric ceramic 2 via a series resistor 10. The piezoelectric ceramic 2 driven with an electric signal produces a counter electromotiveforce between a point (a) and the piezoelectric ceramic 2, and the frequency is at maximum at the resonance frequency of the piezoelectric ceramic. The potential difference across the resistor 10 is inputted to a differential amplifier 11 to output the said counter electromotiveforce only in the inverse phase by exclusing the drive signal, and this output is fed back to an adder 8 via a high pass filter 12, phase adjuster 13 and variable resistor 14. Thus, the excessive oscillation due to resonance phenomenon of the piezoelectric ceramic can be prevented and the damage of the piezoelectric element can be avoided.
JP7699580A 1980-06-06 1980-06-06 Piezoelectric element drive device Pending JPS573496A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7699580A JPS573496A (en) 1980-06-06 1980-06-06 Piezoelectric element drive device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7699580A JPS573496A (en) 1980-06-06 1980-06-06 Piezoelectric element drive device

Publications (1)

Publication Number Publication Date
JPS573496A true JPS573496A (en) 1982-01-08

Family

ID=13621353

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7699580A Pending JPS573496A (en) 1980-06-06 1980-06-06 Piezoelectric element drive device

Country Status (1)

Country Link
JP (1) JPS573496A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5718021A (en) * 1980-07-03 1982-01-29 Matsushita Electric Ind Co Ltd Driving device of piezoelectric element

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5718021A (en) * 1980-07-03 1982-01-29 Matsushita Electric Ind Co Ltd Driving device of piezoelectric element
JPS6242334B2 (en) * 1980-07-03 1987-09-08 Matsushita Electric Ind Co Ltd

Similar Documents

Publication Publication Date Title
KR960029673A (en) A capacitance component reducing circuit of the electrostatic converting means, and a driving apparatus and a detecting device of the electrostatic converting means
US3523235A (en) Self-oscillating switching type power supply
JPS573496A (en) Piezoelectric element drive device
US4233530A (en) Elastic surface wave device
EP0264171A3 (en) Gain selectable amplifier with resonance compensation
DE3463575D1 (en) Measuring process for electric signals using a series-parallel feed-back circuit, and application of this process or circuit to the measuring of voltage sources with extremely high internal impedances
JPS5718021A (en) Driving device of piezoelectric element
US3436643A (en) Solid-state d-c to a-c converter
KR840006108A (en) Analog Signal-Pulse Signal Converter
EP0940863A3 (en) Ultrasonic motor and electronic apparatus having an ultrasonic motor
JPS5742211A (en) Feedback amplifier
DE59009689D1 (en) Residual current circuit breaker with transducer circuit with device for balancing signal curves.
JPS57121308A (en) Power amplifier
US1702568A (en) Constant frequency wave source
SU578065A1 (en) Ultrasonic surgery apparatus
JPS6462007A (en) Oscillator circuit
SE337951B (en)
JPS5716590A (en) Motor driving circuit for controlling device of rotary body
JPS5455362A (en) Electronic watch
JPS6444106A (en) Moisture resistance crystal oscillation circuit
JPS5594138A (en) Vibration type densimeter
SU693525A1 (en) Method and apparatus for damping oscillations in electric drive
SU511674A1 (en) Piezoelectric element
JPS567025A (en) Vibration sensor
JPS5657960A (en) Frequency-current converting circuit