Ultrasonic cleaning equipment is able to play the role of cleaning dirt, the process is caused by the following: cavitation, acoustic streaming, acoustic radiation pressure and acoustic capillary effect. In the process of cleaning, the surface of the dirty material will produce the phenomenon of surface fouling film, such as destruction, peeling, separation, emulsification and dissolution. Different factors have different effects on the washing machine. For those that do not adhere to the dirt, the cleaning is mainly dependent on the effect of the cavitation bubble (not to blow up the cavitation bubble). In the dirt on the edge, due to the strong vibration and blasting pulse bubbles, destroy the binding force between the film and the surface of the dirt, to tear and peel effect. Acoustic radiation pressure and acoustic capillary effect, which causes the washing liquid to penetrate into the tiny concave surface and micropore of the cleaned object. If the dirt and the surface of the attachment is relatively strong, you need to use the cavitation bubbles generated by the blast of micro shock waves, so that the dirt from the surface was pulled down. For aqueous solutions, the optimum temperature is 40 to 50 degrees. Low temperature will reduce the chemical activity of solution. The temperature is too high to improve the elasticity of gas bubbles. Original integrated circuit phase locked loop (PLL) frequency automatic tracking control to power IGBT module output. (acoustic system is a resonant device, only in its resonant frequency, only the maximum efficiency of output, and in the actual process of cleaning, the acoustic system in the load change, fever and other external transducer sensitive, if the resonant frequency of the acoustic system in the outside world under the influence of drift, and the generator. The frequency does not change, will cause the entire system detuning, the efficiency drops, and even burn machine.