The basic knowledge of ultrasonic power

Ultrasonic power also called ultrasonic generator or ultrasonic origin, its main function is to our utility (220V or 380V, 50 or 60Hz) convert and
Ultrasonic transducer matching high-frequency ac signals. Along with the development of technology, industry of ultrasonic cleaning, welding, punch, polishing, etc.

Ultrasonic power principle
First, by ultrasonic power to produce a certain frequency signal, the signal can be sine signals, also can be the pulse signal, this particular frequency is ultrasound
The frequency, wave transducers used in ultrasonic equipment in the ultrasonic frequency for 28KHz, 35KHz, 25KHz, 40KHz, 1OOKHz above 100 KHZ, the frequency
Not use, but with the development of technology, believe you will gradually expanded use of ultrasonic power supply more perfect. Still due mainly to provide feedback to link, two aspects
Feedback signal:

The first is to provide power output signal, we know when the ultrasonic power supply voltage change of ultrasonic power. The output power of will also change, then reverse
Ultrasonic transducer is reflected in the big and small machinery vibration and cleaning effect, cause unstable. Therefore need stable output power, through the power of feedback signal corresponding adjustment
Rate, stable power amplifier.

The second is to provide frequency tracking signal. When the ultrasonic transducer resonant frequency point in the highest efficiency, stable, and the work of the resonant frequency of ultrasonic transducer
The assembly point rate after work and causes ageing of this change, of course, is not just drift frequency signal can be large, frequency tracking control signals ultrasonic
Power, ultrasonic power frequency signal in a certain range tracking ultrasonic transducer. Let the resonant frequency of ultrasonic power working in the best state.

Ultrasonic power classification
According to the design of ultrasonic power points of self-excited mode power supplies and he dared mode power supply. No source of self-excited circuit is the oscillations, amplifier, the output transformer and transducer sets
A closed loop, and formed a loop in amplitude, phase, a feedback conditions have power amplifier oscillator. And in the mechanical resonant transducer resonant frequency
. Generally applied to the small number of ultrasonic transducer equipment, But for ultrasonic transducer number of cases, cannot achieve resonates debugging. So the mesh
Before using ultrasound clean equipment industry of ultrasonic power by his bowel way most.

He separate-excited power structure mainly includes two parts, the former is oscillator amplifier, the latter is. Generally, the output transformer coupling by ultrasonic transducer to energy
. His bowel way circuit consists of two parts, both source and amplification.
Source part adopts the CPU is the core of signal and control section, generally adopted 12-15V voltage driver, produce square-wave signals supply signal amplifier circuit, ultrasound
Wave power of timing control, regulation and control signal can be through the way of the signal output, low voltage control, using high safety and reliability will certainly.

Signal amplifier is part of signal will signal output to after ultrasonic transducer. Different circuits, the ultrasonic power output voltage circuit, is different
The high efficiency in transmission. Output voltage, large energy consumption naturally generator, and can be easily vibrator, produce inductive heating electric field. appropriate
Adjustment to increase output circuit, ultrasonic transducer voltage may obtain good effect.

In addition, if press the end of tube amplifiers used, and type of device four points: valve type ultrasonic power, Thyristor inverter type ultrasonic power, transistor
Type ultrasonic power supply and power module ultrasonic power. With the thyristor inverter type valve type at present already eliminated, basic is widely used in power transistor. This aspect
We will not introduced concretely.

Ultrasonic power and ultrasonic transducer matching problem
In practical applications, how to let ultrasonic transducer of power supply and more matches? Mainly from the following two aspects to consider:

First, it is through the matching the power output to the rated power transducer, which is due to an optimal load power output rated power can be caused by, change
The impedance converting to the best load impedance transformation, namely.

Secondly, through the matching of ultrasonic power output to the highest efficiency, it is because of the ultrasonic transducer is static resistance to work on the output voltage and frequency
Have certain phase difference, thus the output power is not expected to maximum output power output, low efficiency and so on in power output terminal and a string or opposite
Power resistance, resistance to load, i.e., tuning.

Thus with ultrasonic transducer directly affects the matching of ultrasonic power efficiency.