능동 소나용 고출력 송신기에 관한 연구

Abstract

To implement long-distance transmission and reception of signals in the water, low frequency acoustic waves should be used in order to decrease attenuation of underwater signals. However, the underwater acoustic transducers used in generating the acoustic wave, have the characteristics of widely variable impedance as well as large capacitive components according to the driving frequency bands. In addition, since the acoustic transducers are driven individually, the mutual radiation impedance is large, so the equivalent impedance varies very significantly. To solve these problems, this paper proposes an efficient high-power transmitter for acoustic transducers. Also, in order to improve the low power factor of the acoustic transducer, this paper proposes a new matching circuit that uses the magnetizing inductance of the transformer without additional elements. And a new transformer design method that considers the lifetime according to the operating duty of the active sonar is proposed. Finally, this paper proposes a controller using SOGI(Second Order Generalized Integrator) for these high-power transmitters. The proposed high-power transmitter has improved both efficiency and THD(Total Harmonic Distortion). The weight and volume of the proposed matching circuit are reduced by about 20% compared to the conventional matching circuit, and the power factor is improved to almost 1. Also, the performance of the proposed controller is verified through various experiments.