BBT Medical Harmonic Scalpel
BBT Medical Ultrasonic Transducer
Ultrasonic Generator and Its Working Principle
1. What is an ultrasonic generator?
Ultrasonic generator is a kind of equipment that converts the mains power into the corresponding high-frequency AC power of the transducer, to drive the transducer to work. It is an important part of high-power ultrasonic system. It can also be called electronic box, ultrasonic driving power supply and ultrasonic controller.
2. Ultrasonic generator working principle
The input of the ultrasonic generator is a signal with a fixed frequency. The signal waveform is uncertain and can be sinusoidal or pulsed, but its frequency is fixed as the frequency of the transducer, generally 20, 25, 28, 33, 40, 60KHZ, etc. Through the internal conversion of the ultrasonic generator, its output is power signal, frequency tracking signal, etc.
As the output signal presents an unstable state with the change of input signal, some ultrasonic generators also contain feedback parts, which are mainly reflected in two aspects:
On the one hand, the change of the input signal leads to the instability of the output power, resulting in irregular mechanical vibration of the transducer and poor cleaning effect. After adding the feedback part, the power feedback signal adjusts the output power so that it does not change with the change of the input signal and presents a stable state. The regular mechanical vibration of the transducer makes the cleaning effect better.
On the other hand, the efficiency is the highest when the frequency of the transducer is at the resonant frequency point, but in practice, it cannot always work in the best state due to various reasons. Therefore, the feedback part plays its role to provide frequency tracking signal, and the signal sent by the control signal generator is always at the resonant point of the transducer to make it always work in the best state.