The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Design of High-efficiency Power Amplifier System for High-directional Speaker

고지향성 스피커를 위한 새로운 전력 증폭기 설계

  • 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)
  • Received : 2017.03.14
  • Accepted : 2017.06.20
  • Published : 2017.08.01
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Abstract

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.

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References

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