Do you know the working principle of ultrasonic power supply?

What is an ultrasonic power supply? How does it work? Ultrasonic power supply is often called an ultrasonic source or ultrasonic generator. Its function is to convert electrical energy into high-frequency alternating current signals that match the ultrasonic transducer. In terms of amplifier circuit form, linear amplifier circuits and switching power supply circuits can be used. High-power ultrasonic power supplies generally use switching power supply circuit forms in terms of conversion efficiency. Linear power supply also has its unique application range. Its advantage is that it does not strictly require circuit matching and allows continuous and rapid changes in operating frequency.

How does the ultrasonic power supply work?

Ultrasonic power supply, also called ultrasonic generator, is a device used to generate and provide ultrasonic energy to an ultrasonic transducer. Its purpose is to convert our mains power (220V or 380V, 50Hz or 60Hz) into a high-frequency alternating current signal that can match the ultrasonic transducer. This signal can be a sinusoidal signal or a pulse signal.

The ultrasonic screening system consists of ultrasonic vibrating screen power supply, connecting cables, transducers, and resonators. The high-frequency electricity generated by the ultrasonic vibrating screen power supply is converted into high-frequency sinusoidal longitudinal oscillation waves through the transducer. These oscillation waves are transmitted to the resonator to cause the resonator to resonate, and then the resonator transmits the vibration evenly to the screen surface. The materials on the screen undergo low-frequency three-dimensional vibration and are superimposed with ultrasonic vibration, which can not only prevent the mesh from being blocked, but also improve screening output and accuracy.

Ultrasonic power supply classification

Ultrasonic power supplies are divided into self-excited power supplies and separate-excited power supplies according to design.

The self-excited circuit has no signal source. It integrates oscillation, power amplifier, output transformer and transducer to form a closed loop. When the loop meets the amplitude and phase feedback conditions, it forms an oscillator with power amplification. And resonates at the mechanical resonance frequency of the transducer. It is generally used in small equipment with a small number of ultrasonic transducers; however, when the number of ultrasonic transducers is large, it cannot be debugged to achieve a resonance effect. Therefore, most ultrasonic power supplies for industrial ultrasonic cleaning equipment use separate excitation methods.

The separately excited power supply structure mainly consists of two parts, the front stage is an oscillator, and the rear stage is an amplifier. Generally, the ultrasonic energy is added to the transducer through output transformer coupling. The circuit of separate excitation mode consists of two parts, namely the signal source part and the signal amplification part.

The signal source part uses the CPU as the core signal generation and control part, which is generally driven by 12-15V voltage to generate square wave signals and supply them to the signal amplification circuit; additional functions such as timing control and adjustment of the ultrasonic power supply can be controlled by the signal source The output mode is completed and low-voltage control is adopted, so the safety and reliability will definitely be high.

The signal amplification part amplifies the signal generated by the signal source and outputs it to the ultrasonic transducer. The differences in output circuits and voltages of ultrasonic power supplies with different circuits are important reasons for the propagation efficiency. When the output voltage is low, the generator consumes a lot of power. At the same time, the vibrator is prone to heat and the induced electric field generated is strong. Properly adjusting the circuit and increasing the voltage output to the ultrasonic transducer may achieve good results.

In addition, if divided according to the type of device used in the final power amplifier tube, it can be divided into four types: tube ultrasonic power supply; thyristor inverter ultrasonic power supply; transistor ultrasonic power supply and power module ultrasonic power supply. The tube-type and thyristor-type inverters have basically been eliminated, and transistor-type power supplies are currently widely used. The above is an analysis of the working principle of ultrasonic power supply, I hope it can help you.