Ultrasonic Transducer Driver Amplifier Circuit

Ultrasonic generator circuit, also named ultrasonic transducer driver circuit or ultrasonic cleaning power driver board. Is a cost effective method to provide an ultrasonic frequency to drive the ultrasonic transducers to perform an ultrasonic cleaning application. 40Khz Ultrasound Transducer Driver uses Medium Power - This crystal controlled circuit drives a 40KHz piezo transducer with a 30v peak to peak signal.. Hobby Circuit designed by David Johnson P.E.-January, 2006. A Cheap Ultrasonic Range Finder - Do you need to add a distance sensor to your embedded project? Build this simple ultrasonic.

US4965532A - Circuit for driving ultrasonic transducer - Google Patents US4965532A - Circuit for driving ultrasonic transducer - Google Patents Circuit for driving ultrasonic transducer Info Publication number US4965532A US4965532A US07/365,826 US36582689A US4965532A US 4965532 A US4965532 A US 4965532A US 36582689 A US36582689 A US 36582689A US 4965532 A US4965532 A US 4965532A Authority US United States Prior art keywords signal driving voltage phase frequency Prior art date 1988-06-17 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US07/365,826 Inventor Tomohisa Sakurai Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Olympus Corp Original Assignee Olympus Corp Priority date (The priority date is an assumption and is not a legal conclusion.

Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) 1988-06-17 Filing date 1989-06-14 Publication date 1990--06-17 Priority to JP14941588 priority Critical 1988-06-17 Priority to JP63-149415 priority 1989-04-07 Priority to JP1086944A priority patent/JP2647713B2/en 1989-04-07 Priority to JP1-86944 priority 1989-05-15 Priority to JP1-120748 priority 1989-05-15 Priority to JP1120748A priority patent/JP2796549B2/en 1989-06-14 Application filed by Olympus Corp filed Critical Olympus Corp 1989-06-14 Assigned to OLYMPUS OPTICAL CO., LTD. Reassignment OLYMPUS OPTICAL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST. BACKGROUND OF THE INVENTION 1. Field of the Invention and Related Art Statement The present invention relates to a circuit for driving an ultrasonic transducer, and more particularly relates to a circuit for driving an ultrasonic transducer for use in surgical operations. There have been developed various kinds of devices using ultrasonic transducers such as ultrasonic surgical knives, ultrasonic working tools, ultrasonic atomizes, ultrasonic bonding machines and ultrasonic welding machines.

In these ultrasonic devices, in order to improve the efficiency it is desired to drive the ultrasonic transducer at a resonance frequency. However, since the resonance frequency is changed in accordance with temperature variations, it is rather difficult to vibrate the ultrasonic transducer always at the resonance frequency, when there is not provided any means for compensating for the variation of the resonance frequency. Furthermore, the resonance frequency of the ultrasonic transducer is changed in accordance with the condition of the load applied thereto. Therefore, it is required to adjust or change the frequency of the driving signal in accordance with the variation of the resonance frequency of the ultrasonic transducer.

Several solutions for satisfying the above mentioned requirement have been proposed in, for instance U.S. 4,275,363, 4,587,958, 4,724,401 and 4,754,186. In these known ultrasonic transducer driving circuits, there is provided a phase lock loop (PLL) and the frequency of the signal for driving the ultrasonic transducer is automatically controlled to follow the varying resonance frequency of the ultrasonic transducer.

However, the inventor present has confirmed that the known ultrasonic transducer driving circuits including a PLL have a serious drawback which will be explained hereinbelow. 1 shows an equivalent circuit of the piezoelectric type ultrasonic transducer. The ultrasonic transducer 1 is expressed by a parallel circuit of series-connected resistor R, inductor L and capacitance C and a damping capacitance C d. In a practical circuit, in order to cancel the effect of the damping capacitance C d, a compensating inductor L d is connected in parallel with said parallel circuit of the ultrasonic transducer 1.

In such a circuit, the frequency characteristic of a phase difference Δθ between the driving voltage and the driving current can be represented by a curve shown in FIG. 2A, and the frequency characteristic of an impedance Z viewed in the direction shown by an arrow A in FIG. 1 is illustrated in FIG. As illustrated in FIGS. 2A and 2B, the phase difference Δθ becomes zero at a resonance frequency f r as well as antiresonance frequencies f 1 and f 2, these antiresonance frequencies being positioned on respective sides of the resonance frequency f r, and the impedance Z becomes minimum at the resonance frequency f r and becomes maximum at the antiresonance frequencies f 1 and f 2.

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