가변출력전압 AC/DC 컨버터를 이용한 파라메트릭 어레이 트랜스듀서용 고효율 전력증폭기의 설계

Abstract

Parametric array transducers that make parametric array phenomenon are used for telecommunication and high directivity communication in underwater. The power amplifier for driving the parametric array transducers should have good linearity and high efficiency in order to solve fuel problem and heating phenomenon in underwater. However, classical amplifiers using constant supply voltage suffer from the power loss and low efficiency due to large gap between the supply voltage and the amplifier output voltage. Therefore, this paper proposes a new high efficiency power amplifier for parametric array transducer. The proposed power amplifier achieves good linear output characteristic by using class B push-pull amplifier, and high efficiency by adopting ET(Envelope Tracking) technology that make variable supply voltage for power amplifier after input signal. Also, the paper suggests design guidelines and detailed topology about class B push-pull power amplifier and AC/DC converter. Finally, the paper confirms characteristics of the proposed power amplifier system through design and simulation of 2kW-rated variable output voltage AC/DC converter and class B push-pull power amplifier with 20kHz bandwidth.