Ultrasonic generator, also known as ultrasonic drive power supply, electronic box, and ultrasonic controller, is an important part of the high-power ultrasonic system. The function of the ultrasonic generator is to convert the mains electricity into a high-frequency alternating current signal matched with the ultrasonic transducer to drive the ultrasonic transducer to work. High-power ultrasonic power supply generally adopts the circuit form of switching power supply from the aspect of conversion efficiency. Ultrasonic power supplies are divided into self-excited power supplies and other-excited power supplies. Self-excited power supplies are called ultrasonic analog power supplies, and other excited power supplies are called ultrasonic generators.
With the development of modern electronic technology, especially the microprocessor (uP) and signal processor (DSP), the function of the ultrasonic generator is becoming more and more powerful, but no matter how it changes, its core function should be as described below, It's just that each part is different in technology when it is implemented. The ultrasonic generator generates a signal of a specific frequency. This signal can be a sine signal or a pulse signal. This specific frequency is the frequency of the ultrasonic transducer. Generally, the ultrasonic frequency used in ultrasonic equipment is 25KHz, 28KHz, 35KHz, 40KHz; 100KHz
I believe that the use area will gradually expand. A relatively complete ultrasonic generator should also have a feedback link, which mainly provides feedback signals in two aspects:
The first is to provide the output power signal. We know that when the power supply (voltage) of the ultrasonic generator changes. The output power of the ultrasonic generator will also change. At this time, it is reflected in the ultrasonic transducer that the mechanical vibration fluctuates from large to small, which causes the cleaning effect to be unstable. 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 a frequency tracking signal. When the ultrasonic transducer is working at the resonant frequency, its efficiency is the highest and the work is stable. However, the resonant frequency of the ultrasonic transducer will change due to assembly reasons and work aging. Of course, the frequency of this change is only drift, and the change is not very Large, the frequency tracking signal can control the signal ultrasonic generator, so that the frequency of the signal ultrasonic generator can track the resonance frequency of the ultrasonic transducer within a certain range. Let the ultrasonic generator work in the best condition.
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