Control system for calibrating and driving ultrasonic transducer - Patent Review 5406503

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Control system for calibrating and driving ultrasonic transducer

United States Patent

5406503

Link to this page

http://www.wikipatents.com/5406503.html

Inventor(s)

Williams, Jr.; Daniel L. (Florissant, MO); Kepley; Kevin P. (Dellwood, MO); Painter; John A. (St. Charles, MO)

Abstract

An electronic control system for determining the resonant frequency of and driving ultrasonic transducers in a phacoemulsification probe used for ophthalmic surgery. The control system includes a voltage control led oscillator, power amplifier, power monitor, and automatic gain control circuit operating under the direction of command signals received from a microprocessor-based control console. The control system operates in a constant apparent power, direct drive mode with closed loop feedback maintaining the electrical power provided to the primary of a RLC transformer at the constant level requested by the command signals from the console. The frequency of the drive signal is held at the dominant resonant frequency of the ultrasonic transducer which is being driven by the control system. This resonant frequency is determined via a calibration procedure performed when the probe is first attached to the control system. During this procedure a constant voltage drive signal is swept through a range of frequencies and the electrical power consumed by the transducer is measured and stored at selected intervals such as 100 Hertz increments. The resonant frequency is also determined in part by looking for the frequency at which maximum power is consumed by the probe. The stored data is also subjected to other tests to check that the peak is indeed a resonant frequency and that the probe has selected output power characteristics about this resonant frequency, thus helping to ensure that the probe is capable of operating satisfactorily when driven by the control system.

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U.S. References

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Reference	Relevancy	Comments	Reference	Relevancy	Comments
2947889	Your vote accepted [0 after 0 votes]		3517665	Your vote accepted [0 after 0 votes]
3772538	Your vote accepted [0 after 0 votes]		5113116 Wilson 310/316.01 May,1992	Your vote accepted [0 after 0 votes]
5001649 Lo 702/124 Mar,1991	Your vote accepted [0 after 0 votes]		4966131 Houghton 601/2 Oct,1990	Your vote accepted [0 after 0 votes]
4903696 Stasz 606/37 Feb,1990	Your vote accepted [0 after 0 votes]		4886060 Wiksell 606/39 Dec,1989	Your vote accepted [0 after 0 votes]
4867141 Nakada 601/4 Sep,1989	Your vote accepted [0 after 0 votes]		4861332 Parisi 604/22 Aug,1989	Your vote accepted [0 after 0 votes]
4635483 Mishiro 73/579 Jan,1987	Your vote accepted [0 after 0 votes]		4634420 Spinosa 604/22 Jan,1987	Your vote accepted [0 after 0 votes]
4633119 Thompson 310/325 Dec,1986	Your vote accepted [0 after 0 votes]		4587958 Noguchi 601/2 May,1986	Your vote accepted [0 after 0 votes]
4371816 Wieser 318/118 Feb,1983	Your vote accepted [0 after 0 votes]		4169984 Parisi 310/323.18 Oct,1979	Your vote accepted [0 after 0 votes]
4168447 Bussiere 310/316.01 Sep,1979	Your vote accepted [0 after 0 votes]		3990452 Murry 606/169 Nov,1976	Your vote accepted [0 after 0 votes]
3629726 Popescu Dec,1971	Your vote accepted [0 after 0 votes]		4989155 Begin 702/62 Dec,1969	Your vote accepted [0 after 0 votes]
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