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Electrical Characteristics of Disk-type Piezoelectric Transformer Poled with the Same Direction

동일 방향으로 분극된 디스크형 압전변압기의 전기적 특성

  • 이종필 (광운대학교 전기공학과) ;
  • 홍진웅 (광운대학교 전기공학과)
  • Published : 2003.08.01

Abstract

For high voltage operation, a new type of piezoelectric transformer using radial vibration of disk, poled with the same direction was proposed. The piezoelectric ceramics was composed to PZT-PMN-PSN. The diameter and thickness of a disk type piezoelectric transformer were 45[mm]and 4[mm], respectively The surface ratio of driving electrode and generating electrode of the piezoelectric transformer was 2 : 1. The resonance characteristics of input admittance, step-up voltage ratio and power transmission efficiency of the piezoelectric transformer were measured by varying the load resistance(0.1∼70[kΩ]). As a result, both resonance frequency and step-up voltage ratio increased with increasing load resistance. The step-up voltage ratio was reached more than 60 times under no load resistance. The maximum efficiency of 97% at load resistance of 2kΩ was obtained.

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