The principle of the ultrasonic power supply is that the signal generator first generates a signal of a specific frequency. This signal can be a sinusoidal signal or a pulse signal. This specific frequency is the frequency of the transducer, which is generally used in ultrasonic equipment 20KHz, 25KHz, 28KHz, 33KHz, 40KHz, 60KHz; 100KHz or above has not been used in large quantities. But with the continuous development of precision cleaning in the future. I believe that the use will gradually expand.
The more perfect ultrasonic power supply should also have a feedback link, which mainly provides feedback signals in two aspects: the first is to provide output power signals, we know that when the power supply (voltage) of the generator changes. The output power of the generator will also change. At this time, the mechanical vibration reflected on the transducer is suddenly large and small, resulting in unstable cleaning effects. Therefore, it is necessary to stabilize the output power, and adjust the power amplifier accordingly through the power feedback signal to make the power amplification stable.
The second is to provide frequency tracking signals. When the transducer works at the resonance frequency point, its efficiency is the highest and the operation is the most stable. The resonance frequency point of the transducer will change due to assembly reasons and after working aging. Of course, the frequency of this change is only drift, the change is not very large The frequency tracking signal can control the signal generator so that the frequency of the signal generator tracks the resonance frequency point of the transducer within a certain range. Let the generator work at its best. Of course, with the development of modern electronic ultrasound technology, especially the microprocessor (uP) and signal processor (DSP), the function of the generator is becoming more and more powerful, but no matter how it changes, its core function should be as described above The content is just that the ultrasonic technology is different when each part is realized.
