Design of transmitter circuit of phased-array doppler current profiler

HANG Liang
（The 715th Research Institute of China Shipbuilding Industry Corporation， Hangzhou 310012， China）

Abstract： The transmitter is an essential part of the phased-array Doppler current profiler，which directly affects the power conversion efficiency and transmission distance of the acoustic signals in the water. Class-C power amplifier is often used by the traditional transmitter，which has some shortages such as low efficiency，large size，low power output and instability. Aiming at the above problems，the transmitter principle and technical requirements were investigated. Combined with the design methods and the experience of morden audio amplifier，the integrated digital audio power amplifier technology was applied to the underwater acoustic transmitter. A new design was presented to enhance the stability and efficiency of transmitter circuit，the better impedance matching between power amplifier and transducers was obtained. The experimental results indicate that the transmitter can achieve the purpose of the max power output，improve the overall performance and meet the product requirements.
Key words： phased-array； Doppler current profiler； transformer； circuit； power amplifer； matching network