Power ultrasonic driving circuit model applying to atomizer

In recent years, accompanying with the development of the high-speed switch device and microprocessor technology, the range of high power ultrasonic application becomes very broad. The power ultrasonic usually applies to sonar, atomization, cleaning technology, and medical instrument, etc. However, a good designed ultrasonic driving circuits for the power ultrasonic system is very deficient. In General, frequency of high power ultrasonic circuit reaches a maximum of hundreds of thousands hertz, whereas the high frequency circuit can just provide limited power. Long-term steady-going operating is also a problem for power ultrasonic driving circuit on design and in use.
Therefore, this paper shows a high power ultrasonic driving circuit model and describes the concepts and manners in detail of each subtle circuit in this circuit model. This circuit model can drive from hundreds of thousands to several millions hertz on the high power condition, and it has high conversion efficiency between mechanical terminals and electrical ones. Even though the application of ultrasonic atomization in engineering is more general and more important, it is rare to have a good ultrasonic atomization system with high efficiency and excellent atomization effect. As result, in this paper, we are going to apply this circuit model to the ultrasonic atomization system. This circuit can drive transducers with resonance frequency between 500KHz to 2MHz. Its output voltage can be adjusted and the maximum rated output power is 30W. Besides, we’re going to observe and discuss the atomization phenomenon of this atomizer, which includes the relationship between the sizes of droplet and driving frequency, the atomization velocity, and the relationship between the droplet size distribution and the driving voltage.