水声换能器功放与匹配电路的设计与实现

Abstract

是针对20 k~30 k频段的水声换能器设计d类功率放大器和匹配电路,PWM电路相对线性电路具有效率高、尺寸小等优点,所以d类功放一般选用PWM调制,d类功放由三角波发生器、比较器、功率管以及保护模块组成,实现高效率、低失真的功率放大。d类功放的输出一般都要通过一个低通滤波器来滤除高频信号,来还原低频信号。由于水声换能器是容性负载,会产生很大的无功功率,因此需要设计匹配电路,匹配包括调谐和阻抗匹配。匹配电路的加入能大大减少水声换能器的无功功率,进而提高功放的效率,使水声换能器在工作频段内能稳定工作。

The article is about D-class power amplifier and matching circuit designed for 20 ~30 k spectrum underwater sound transducer.PWM circuit is more efficient and smaller than linear circuit,so we choose PWM modulation in D-class power amplifier.D-class power amplifier is composed of triangle wave generator,comparator,power tube and protection module,realizes high efficiency and low distortion power amplification.The output of D-class power amplifier typically filters out high-frequency signals through a low-pass filter,restores low-frequency signals.Underwater sound transducer is capacitive load,and it will produce large reactive power.You should design the matching circuit,including tuning and impedance matching.The matching circuit greatly reduces reactive power of underwater sound transducer,and enhances efficiency of power amplifier,ensuring underwater sound transducer in good working condition.