Design of a varying ultrasonic frequency amplifier

Ultrasonic amplifiers are commonly used for different applications such as ultrasonic drilling, ultrasonic cleaning, and medical applications including cosmetics. This paper aims to design an ultrasonic amplifier with varying frequency that has a dual-ended output which minimizes equipment size, decreases power loss, increases efficiency, and increases its performance. This design of ultrasonic frequency amplifier will be used for ultrasonic cleaning of fabrics. The amplifier is composed of transformers, bridge rectifiers, signal generator and a driver circuit. The driver circuit is also composed of the pre-amplifier and the H-bridge. The H-bridge, which is a dual-ended output, is an electronic circuit which allows voltage to pass through a load in either direction. The output peak amplitude of the system is at 168V, whereby if an H-bridge is to be considered the total voltage it may supply to the system is 336V. The use of an H-bridge will enable efficient use of power for the system operation, decreasing power losses. The frequency output varies between 28 to 40 kHz.