The ultrasonic generator generates a signal of a specific frequency. This signal can be a sinusoidal signal or a pulse signal. This specific frequency is the frequency of the ultrasonic transducer. Generally, there are many ultrasonic frequencies used in ultrasonic equipment. With the continuous development of technology, it is believed that the application area will gradually expand. A relatively complete generator should also have a feedback link, which mainly provides feedback signals in two aspects.
We know when the voltage of the sonotrode changes. The output power of the ultrasonic power supply will also change. At this time, it is reflected in the ultrasonic transducer generator that the mechanical vibration fluctuates. Therefore, it is necessary to stabilize the output power. The power amplifier is adjusted accordingly through the power feedback signal to make the power amplification stable.
When the ultrasonic transducer works at the resonant frequency, it has the highest efficiency and the most stable operation. The resonant frequency of the ultrasonic transducer will change due to assembly reasons and aging. Of course, the frequency of this change is only a drift, and the change is not very The frequency tracking signal can control the signal ultrasonic power supply, so that the frequency of the signal ultrasonic power supply can track the resonance frequency point of the ultrasonic transducer within a certain range. Let the ultrasonic power supply work in the best state.
The ultrasonic generator is divided into self-excitation mode power supply and other excitation mode power supply 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 satisfies the amplitude and phase feedback conditions to form 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, in the case of a large number of ultrasonic transducers, it is impossible to debug to achieve the resonance effect.
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