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압전 진동 에너지 수확 장치의 에너지 변환 효율에 대한 고찰

On the Energy Conversion Efficiency of Piezoelectric Vibration Energy Harvesting Devices

  • 김재은 (대구가톨릭대학교 기계자동차공학부)
  • Kim, Jae Eun (School of Mechanical and Automotive Engineering, Catholic Univ. of Daegu)
  • 투고 : 2015.01.23
  • 심사 : 2015.02.27
  • 발행 : 2015.05.01

초록

압전 진동 에너지 수확 장치의 설계 및 성능 평가 시 에너지 변환 효율을 고려하는 것은 매우 당연하다. 본 연구에서 고려하는 에너지 변환 효율은 부하 저항이 부착된 압전 진동 에너지 수확 장치에 입력되는 가진 진동 파워 대비 전기 출력 값으로 정의된다. 기존의 연구에서는 근사적으로 임피던스 정합된 부하 저항에서의 전기 출력을 고려한 반면, 본 연구에서는 최적의 임피던스 정합 값을 사용하여 새롭게 에너지 변환 효율 식을 유도하였다. 유도된 식의 타당성을 검증하기 위해 3 개의 서로 다른 전기-역학 연성 계수 값을 갖는 진동 에너지 수확 장치에 대한 유한 요소 해석 결과를 이용하였다. 또한, 부하 저항의 임피던스 정합 방법의 차이에 따른 에너지 변환 및 변환 효율 특성을 살펴보았다.

키워드

진동;에너지 수확;압전;변환효율;임피던스 정합;전기-역학 연성 계수

과제정보

연구 과제 주관 기관 : 대구가톨릭대학교

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피인용 문헌

  1. Electrically Induced Damping Characteristics and a Relevant Requirement for the Maximum Power Generation in Piezoelectric Vibration Energy Harvesters vol.25, pp.6, 2015, https://doi.org/10.5050/KSNVE.2015.25.6.406
  2. New efficiency measures of energy conversion and their characterization for piezoelectric vibration energy harvesters vol.28, pp.20, 2017, https://doi.org/10.1177/1045389X17704070