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Clamped capacitance control of a piezoelectric single crystal vibrator using a generalized impedance converter circuit

범용 임피던스 변환회로를 이용한 압전 단결정 진동자의 제동용량 제어

Jungsoon Kim1
,
Moojoon Kim2*
김 정순1
,
김 무준2*
2Department of Physice, Pukyong National University
1동명대학교 전기공학과
2부경대학교 물리학과
*교신저자. *Corresponding Author. 
31 January 2018. pp. 46-52
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Abstract

The piezoelectric single crystals used in piezoelectric transformers have a problem that power transfer capacity is comparatively low due to their high input impedance. In this study, we suggest a method to improve the power transfer capacity by reducing the high input impedance of the piezoelectric single crystal vibrator by connecting a capacitance increasing circuit to the electrical terminals of the piezoelectric single crystal vibrator where the circuit is a GIC (Generalized Impedance Converter) circuit using operational amplifiers. The result of measuring driving characteristics after applying the designed capacitance increasing circuit to the 128° rotated Y-cut LiNbO3 crystal vibrator confirmed that the input impedance decreased by 25 %, electromechanical coupling factor increased by 30 %, and the power transfer capacity increased by about 17 to 30 times in voltage conversion characteristics.

Keywords
Single crystal piezoelectric vibrator
Clamped capacitance
Input impedance
GIC (Generalized Impedance Converter)circuit
Power transfer capacity

압전변압기에 사용되는 압전 단결정은 높은 입력 임피던스로 인하여 파워전송용량이 높지 않다는 문제점이 있다. 따라서 본 연구에서는 연산증폭기를 사용한 범용 임피던스 변환(General Impedance Convert, GIC) 회로로 구현된 정전용량 증가회로를 압전 단결정 진동자의 전기단자에 연결함으로써 입력임피던스를 저하시켜 파워전송용량을 향상시킬 수 있는 방법을 제안하였다. 128°회전 Y판 LiNbO3 단결정 진동자에 설계 제작된 정전용량 증가회로를 적용하여 구동 특성을 측정한 결과, 입력임피턴스는 25 % 감소, 전기-기계결합계수는 30 % 증가, 전압변환 특성에 있어서는 약 17 ~30배의 출력파워용량이 증가됨을 확인하였다.

키워드
압전단결정 진동자
제동용량
입력임피던스
범용 임피던스 변환회로
파워전송용량
References
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 37
  • No :1
  • Pages :46-52
  • Received Date : 2017-12-12
  • Revised Date : 2018-01-16
  • Accepted Date : 2018-01-30
  • DOI :https://doi.org/10.7776/ASK.2018.37.1.046
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