Feedback signal of ultrasonic generator

Perfect ultrasonic generator with feedback link, mainly in the following two aspects to provide feedback signals.

The output power

When the access voltage of the ultrasonic generator changes, the output power of the generator will also change. This will make the mechanical vibration of ultrasonic transducer unstable, resulting in poor working results. Therefore, it is necessary to stabilize the output power and adjust the power amplifier through the power feedback signal to make the power amplifier stable.

Frequency tracking

When the transducer works at a resonant frequency, it works efficiently and stably.

And the resonant frequency points of the transducer will change due to assembly and aging. If the changing frequency only drifts and changes little, then the frequency tracking signal can control the signal generator, so that the frequency of the signal generator can track the resonant frequency points of the transducer within a certain range, so that the generator works in the state of.

An ultrasonic generator produces a signal of a specific frequency. The signal may be a sinusoidal signal or an impulse signal. This particular frequency is the frequency at which the transducer operates.

Ultrasonic equipment is commonly used at ultrasound frequencies of 20 kHz, 25 kHz, 28 kHz, 33 kHz, 40 kHz, 60 kHz, 80 kHz, 100 kHz or higher and has not been used in large quantities.

Compared with the structure of the self-excited oscillation circuit, the output power of the ultrasonic generator is increased by more than 10%. The form of ultrasonic amplifier circuit adopts linear amplifier circuit and switching power supply circuit.

Advantages of switching power supply circuit: high conversion efficiency, so high power ultrasonic power supply in this form.

Advantages of linear power supply circuits: strict circuit matching is not required and rapid frequency changes are allowed continuously.