Matching Index and Frequency of Ultrasonic Transducer

The ultrasonic transducer cooperate well with the driving power supply of the ultrasonic generator and the ultrasonic mold to form a complete ultrasonic equipment, which can be referred to as matching. Since the influence of matching on the performance of the whole machine is decisive, the importance of matching cannot be overemphasized. The main consideration of matching is the capacitance of ultrasonic transducer, then is the frequency of transducer. It should be emphasized that the ultrasonic transducer itself is not an energy generator, it is just an energy converter. It is to convert electric energy into sound energy, also named mechanical energy. On the premise of good matching between input (driving power supply) and output (amplifier and ultrasonic mold), it can convert a lot of energy. Contact bbt surgery equipments company for more ultrasonic transducer price info!


Ⅰ. Matching index of ultrasonic transducer

Input matching refers to the matching between ultrasonic transducer and ultrasonic power supply. If the output matching is good and the input matching is not good, the transducer is weak and the welding is not firm. If the output match is not good and the input match is good, the transducer will be overloaded, resulting in dislocation, cracking and breakage of the wafer, broken screw, aluminum crack or power tube of the power box. For example, just like a car slamming on the accelerator in neutral, the engine must be easy to damage. The matching between medical ultrasonic transducer and driving power supply mainly has four aspects, impedance matching, frequency matching, power matching and capacitive reactance matching.


Ⅱ. Frequency matching of ultrasonic transducer


Frequency matching is also very important. Firstly, because the ultrasonic surgical instrument can only work at its resonant frequency, the driving power supply, horn and welding die (tool head) should work at this frequency. Generally speaking, we hope that the maximum difference is no more than ± 0.1khz, which is better if it can be smaller. At the same time, it should be considered that after the ultrasonic transducer is connected with the horn and die head, the peak resonant frequency of the system will become very sharp, that is, the bandwidth is very narrow, the mechanical quality factor is very large, and the frequency offset will cause a great increase in impedance. Performance in the driving power supply is that the power supply (amplitude meter power) is large or overload protection. If it happens to be no-load adjustment at this time, it is likely to cause wafer dislocation, wafer cracking or central screw breakage.


Power matching and impedance matching mainly take into account that the ultrasonic welding system works in gap mode, the load changes greatly, there should be sufficient power output during welding, and the minimum amplitude should be controlled under no-load. Otherwise, as mentioned earlier, a large input at no-load will damage the transducer. The power cannot go up at full load, and it is useless if it cannot be welded firmly.


The matching of ultrasonic transducers is briefly introduced here. I hope it will be helpful for everyone to understand and use ultrasonic transducers. BBT ultrasonic transducer can provide technical solutions for ultrasonic applications in various fields. If you have any needs, please feel free to contact us!

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