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How to use Ultrasonic generator in 2018 (NEW Guide)

2018-10-04 22:39 admin
The principle of ultrasonic power supply is that the signal generator first produces a specific frequency signal, which can be a sinusoidal signal or a pulse signal. This specific frequency is the frequency of the ultrasonic transducer. Usually used in ultrasonic equipment, the ultrasonic frequency is 20KHz, 25KHz, 28KHz, 33KHz, 40KHz, 60KHz. 100KHz or above is not yet widely used. But with the continuous development of precision cleaning in the future. I believe the use will gradually expand.

A more perfect ultrasonic power supply should also have a feedback link, mainly to provide two aspects of the feedback signal: the first is to provide output power signal, we know when the generator power supply (voltage) changes. The output power of the generator will also change, which is reflected in the transducer is the mechanical vibration of the big or small, resulting in unstable cleaning effect. Therefore, it is necessary to stabilize the output power and adjust the power amplifier by power feedback signal to make the power amplification stable.

The second is to provide frequency tracking signals. When the transducer works at the resonant frequency point, its efficiency is the highest, the most stable work, and the resonant frequency point of the transducer will change due to assembly reasons and working aging, of course, the frequency of this change is only drift, the change is not very big, frequency tracking signal can control the generator, so that the frequency of the signal generator is in one The resonant frequency of the transducer is tracked within a fixed range. Let the ultrasonic generator work at its best. Of course, with the development of modern electronic ultrasonic technology, especially microprocessor (uP) and signal processor (DSP), the generator is becoming more and more powerful, but no matter how it changes, its core function should be as mentioned above, but the ultrasonic technology is different in each part.

The ultrasonic power supply is divided into self excitation mode and power supply mode according to the design.
The self-excited circuit has no signal source. It integrates oscillation, power amplifier, output transformer and transducer into a closed loop. The loop meets amplitude and phase feedback conditions to form an oscillator with power amplification. And resonate at the resonant frequency of transducer. Usually used in small ultrasonic transducer number of small equipment; but for the ultrasonic transducer number of cases, can not be debugged to achieve resonance effect. Therefore, the ultrasonic power supply of industrial ultrasonic cleaning equipment mostly adopts the way of stimulating himself.

The structure of the excitation power supply mainly consists of two parts, the former is an oscillator and the latter is an amplifier. Generally, the ultrasonic energy is added to the transducer through the coupling of the output transformer. The circuit of his excitation mode consists of two parts, the signal source part and the signal amplification part.
Signal source part uses CPU as the core of the signal generation and control part, generally using 12-15V voltage drive, generating square wave signal to supply signal amplification circuit; ultrasonic power supply timing control, regulation and other additional functions can be completed by the signal output mode of the control signal source, using low voltage control, safe and reliable Sex is bound to be high.

The amplifying part of the signal amplifies the signal generated by the signal source and outputs it to the ultrasonic transducer. Different circuits of ultrasonic power supply, the output circuit, voltage difference is an important reason for the high or low transmission efficiency. When the output voltage is low, the generator will consume a lot of electric energy. At the same time, the oscillator is easy to heat and the induced electric field is strong. Adjusting the circuit properly and increasing the output voltage to the ultrasonic transducer may achieve good results.

In addition, according to the type of devices used in the last stage power amplifier tube, it can be divided into four types: electronic tube ultrasonic power supply; silicon controlled inverter ultrasonic power supply; transistor ultrasonic power supply and power module ultrasonic power supply. Electron tube and silicon controlled inverters have been basically eliminated, and transistor power supply is widely used.
How to use Ultrasonic generator in 2018 (NEW Guide)

How to use Ultrasonic generator in 2018 (NEW Guide)

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author:UCESONIC

TAG ultrasonic: Ultrasonic generator Guide