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고지향성 스피커를 위한 새로운 전력 증폭기 설계

Design of High-efficiency Power Amplifier System for High-directional Speaker

  • Kim, Jin-Young (Dept. of Electrical Engineering, Pukyong Nat. University) ;
  • Kim, In-Dong (Dept. of Electrical Engineering, Pukyong Nat. University) ;
  • Moon, Wonkyu (Dept. Mechanical Engineering, Pohang Univ. of Science and Technology)
  • 투고 : 2017.03.14
  • 심사 : 2017.06.20
  • 발행 : 2017.08.01

초록

Parametric array transducers are used for highly directional speaker in an air environments. Piezoelectric micromachined ultrasonic transducers for parametric array transducers need DC-biased voltage driving signals in order to get high-directional quality-sound features. The existing power amplifier such as class A amplifiers has low efficiency and require large volume heatsinks. To overcome the above-mentioned disadvantages of the conventional amplifier, this paper proposes a new power amplifier system. The proposed power amplifier system ensures high linearity of output characteristic by utilizing the push-pull class B type amplifier. Furthermore, the proposed power amplifier system gets high efficiency because it contains the DC-DC converter-type power supply which can perform energy recovery and envelope tracking function. Also the paper suggests the detailed circuit topology. Its characteristics are verified by the detailed experimental results.

키워드

참고문헌

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