ultrasonic generator how it works?

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.

[2]

In digital electronic equipment, waveform generation circuit has always been a very important circuit. Although sinusoids are not the most commonly used waveforms, it is not easy to produce a precise and stable sinusoidal wave. The traditional sine wave generating circuit is usually realized by analog circuit, which is neither precise nor stable, and has a huge volume. Along with the digital development of the circuit system, the digital frequency synthesis is applied directly.

A sinusoidal signal generator with controllable frequency and phase is designed and implemented by using DSP chip and D/A converter and direct digital frequency synthesis technology. The output power, amplitude and energy are controlled by digital system including frequency setting, tracking compensation, amplitude setting, amplifying and matching output, signal detection and analysis. In the ultrasonic computer controlled welding system, there are time, energy, distance dimension, depth dimension and other application modes to achieve different welding requirements. The system has the characteristics of high precision, intuitive display, high intelligence, flexible control, good performance, better reliability and stability, easy to use and high performance-price ratio.

The traditional analog circuit is composed of discrete components, such as self-excited or self-excited components, which are amplified and matched to the transducer to form a closed loop. After simple time control, ultrasonic welding is realized. But can not preset its frequency, amplitude, energy control, can only achieve simple time welding, some domestic manufacturers use computer touch screen control, on the surface, improve the equipment grade, in fact, even if the time is more accurate can not meet some higher requirements of product welding.