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Current and resonance tracking in an ultrasonic drive circuit with an Arduino

Husain Shekhani • Jun 19, 2023

  I hosted a webinar on June 16, 2023 on

"Current and resonance tracking in an ultrasonic drive circuit with an Arduino"

You can watch the recording on my YouTube Channel here: 

https://youtu.be/9npoCMlmqRM


Here is a link to the presentation notes.

Here is a link to the Arduino code.


Topics

In this webinar recording, I implemented current measurement and frequency and voltage amplitude control to create a feedback loop to track the resonance frequency and also to drive the target current.

I used an Arduino nano, JFET (amplitude control), sine wave generator chip, and an amplifier with a transformer.


Video outline:

  • 0:00 Introduction to the topic
  • 1:00 Pictures of drive circuit and ultrasonic scaler
  • 3:10 Function generator DJ (a joke about manually controlling frequency and amplitude)
  • 4:15 About Ultrasonic Advisors
  • 5:30 Detailed outline
  • 8:20 Quick overview of the drive logic of ultrasonic transducer driver control
  • 11:20 Discussion of the impedance response of an ultrasonic scalpel
  • 15:45 Previous circuit webinars
  • 16:56 Current measurement circuit
  • 19:18 Voltage amplitude control circuit with a P JFET
  • 27:31 Block diagram of drive circuit and logic
  • 28:32 Circuit pictures
  • 30:15 Code overview/Arduino code review
  • 36:24 Drive control logic explanation to search for the resonance frequency based off current measurement
  • 37:20 Explanation of parts (Arduino, sine wave generator IC, amplifier, dental scaler ultrasonic transducer
  • 39:29 Winding transformer
  • 41:21 Live demonstration of circuit via oscilloscope, Arduino serial output, and visual micron displacement measurement
  • 45:00 Displacement measurement at the maximum output of the circuit


***Announcement***

My next webinar will be on Friday, July 14, 2023 at 11AM EST. I will cover

"Transformer design for ultrasonic transducers drive circuits”

Here is the link to sign up for the upcoming webinar: https://www.ultrasonicadvisors.com/monthly-ultrasonic-webinar

Follow the link here to learn about my ultrasonic transducer consulting services and prices

Services and Prices

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