为了把电信号转成声波进而在海洋信道中传播，研制一种高可靠性的水声发射机显得格外重要．通过研究水声发射机较大功率应用时，传统推挽功放在采用方波激励驱动电抗性负载所面临的可靠性问题，进一步提出在电路上的各种改进措施，从而避免了因空载、单边激励等原因对功率器件的损坏．并且通过长期的出海考验，证实了改进后发射机的高可靠性，因此对整机的性能有很大的改善．同时这些改进方案对于提高某些采用ＰＷＭ 信号驱动电抗性负载的功率电子仪器、设备的可靠性也有很大的实用价值． In order to convert electrical signals into sound waves and then spread in oceanic channels, it is particularly important to develop a highly reliable underwater acoustic transmitter. Through studying the reliability of the traditional push-pull power amplifier when using the high power of the acoustic transmitter, the traditional push-pull power amplifier is put forward by adopting the square wave excitation to drive the reactive load, and various improvement measures are further proposed on the circuit, so that no load, Unilateral excitation and other reasons for damage to power devices. And through the long-term test of the sea, confirmed the high reliability of the improved transmitter, so the performance of the machine has been greatly improved. At the same time, these improvements have great practical value for improving the reliability of some power electronic instruments that use PWM signals to drive reactive loads.