GaN 소자를 이용한 능동소나용 고출력 전력증폭기의 새로운 제어 방식 연구

Abstract

The acoustic sensor of the active sonar has characteristics that the impedance of the sensor changes greatly due to mutual acoustic interference. The power amplifier for the active sonar with this kind of load characteristics generates harmonic components and introduce various disturbance components. Also, active sonar power amplifiers must ensure wide bandwidth and output linearity, while at the same time they must operate at high efficiency to solve the heat and fuel problems of the system. Therefore, this paper design a power amplifier with high efficiency characteristics by designing a power amplifier using GaN devices, and propose a new power & current limit and feedforward control method to improve stability and linearity of power amplifier for active sonar. The proposed control method improves the stability of the power amplifier and improves the total harmonic distortion (THD) characteristics compared with the conventional feedback control method through PSIM simulation.