I have an Bolted Langevin Transducer, resonating at its half wavelength frequency at around 52kHz, and the impedance measurement at resonance shows a 200ohm, and a -22° phase angle.
I check online, there are quite a number of different configurations of impedance matching circuit design proposals. I took the LC configuration, where the inductance L is place between the electrical source and the live wire of the piezoceramics, the capacitance is place between the output inductance and ground. So the circuit is simply a low-pass filter configuration.
The impedance measurement for the LC circuit + ultrasonic transducer demonstrates a 48ohm, -4° phase at around 51kHz.
However, when I powered up the device, with and without the LC matching circuit, using the same applied voltage input, the device without matching demonstrates an almost double vibration output compared to the device with matching.
Am I doing something incorrect? I thought bringing the impedance down to 50ohm will match to the electrical source output impedance, and an almost 0° will ensure a maximal power transfer?
Looking forward to your feedback!
Thanks,
Xuan Li
Hello Dr X Li: " A new method that is based on genetic algorithm (GA) is developed to design electrical impedance matching network for broadband piezoelectric ultrasound transducer. The new method can both optimize the topology of the matching network and perform optimization on the components at the same time. " Article A New Method of Designing Electrical Impedance Matching Netw...
https://ieeexplore.ieee.org/abstract/document/8642399
The Effect of Electrical Impedance Matching on the ... - MDPI
PDFby Y Yang - 2017
Article The Effect of Electrical Impedance Matching on the Electrome...
Article Low Cost Matching Network for Ultrasonic Transducers
The above input should prove helpful. Should you have further queries related to your question, kindly post. Regards--
Do use some ferrite based inductor? If it is rather high power situation and especially considering reactive power being higher by Q-factor you may have excessive losses in the ferrite - it might be driven into saturation.
Hi X. Li, did you solved this issue?
I was thinking about it. What kind of electrical parts did you use for the matching network? If you choose SMD parts it is important that the SMDs are specified for working at high voltages.
Please let me know if you have some new informations. thx.
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