EP0172263A1 - Method and arrangement to maintain constant the power delivery of an ultrasonic cleaning system - Google Patents

Method and arrangement to maintain constant the power delivery of an ultrasonic cleaning system Download PDF

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Publication number
EP0172263A1
EP0172263A1 EP84109748A EP84109748A EP0172263A1 EP 0172263 A1 EP0172263 A1 EP 0172263A1 EP 84109748 A EP84109748 A EP 84109748A EP 84109748 A EP84109748 A EP 84109748A EP 0172263 A1 EP0172263 A1 EP 0172263A1
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EP
European Patent Office
Prior art keywords
power
generator
power delivery
frequency
ultrasonic cleaning
Prior art date
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.)
Withdrawn
Application number
EP84109748A
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German (de)
French (fr)
Inventor
Dieter Weber
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.)
Martin Walter Ultraschalltechnik GmbH
Original Assignee
Martin Walter Ultraschalltechnik GmbH
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.)
Filing date
Publication date
Priority to DE19833317045 priority Critical patent/DE3317045A1/en
Application filed by Martin Walter Ultraschalltechnik GmbH filed Critical Martin Walter Ultraschalltechnik GmbH
Priority to EP84109748A priority patent/EP0172263A1/en
Publication of EP0172263A1 publication Critical patent/EP0172263A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
    • B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits
    • B06B1/0223—Driving circuits for generating signals continuous in time
    • B06B1/0238—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave
    • B06B1/0246—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal
    • B06B1/0253—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave with a feedback signal taken directly from the generator circuit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
    • B06B2201/70—Specific application
    • B06B2201/71—Cleaning in a tank

Definitions

  • the invention relates to a method for keeping the power output of ultrasonic cleaning systems constant with one (or more) sound transducer (vibrator) acting on the cleaning liquid, which is fed by an ultrasonic generator (HF generator), and an arrangement for carrying out the method.
  • HF generator ultrasonic generator
  • Ultrasonic cleaning generally takes place in a liquid which must be matched to both the material and the structure of the items to be cleaned and the type of soiling.
  • the high tensile and compressive forces which occur in the liquid bath and which cause cavitation, which in turn releases the dirt particles from the items to be cleaned, are used for cleaning.
  • tensile and compressive forces or the maximum cavitation are only achieved when the entire system is in resonance.
  • the resonance conditions shift very strongly under the influence of changes in a wide variety of parameters, from mains voltage fluctuations to temperature changes. This means that a system designed for a certain output will only achieve this output exceptionally or that the desired cleaning performance can only be achieved with meticulous observance of the individual parameter limit values.
  • ultrasonic cleaning systems of this type are therefore always oversized in order to achieve a sufficient cleaning effect even under unfavorable conditions.
  • the desired cleaning action is up to more or less randomly, ie that the effect of the cleaning system between the two extremes - may vary, and is - on the one hand g insufficient cleaning effect, on the other hand, damage to the Cleaner with Rins.
  • a cleaning effect that is too low can, for example, damage the line voltage even when the line voltage drops.
  • the object of the invention is to provide a method and an arrangement for carrying out the method, which ensures the constant, adjustable power output of such an ultrasonic cleaning system.
  • an active power measuring device to form the actual value between the generator, the ultrasonic frequency of which is determined by means of a VCO (voltage controlled oscillator) and the converter, and to connect this measuring device with a differential amplifier p n, which is also via an actuator is supplied with a stabilized setpoint whose output voltage, that is to say the amplified difference between the actual value and setpoint, then controls the VCO.
  • the setpoint can be controlled in the usual way by a controllable, stabilized DC voltage or a corresponding pulsating DC voltage be given.
  • the drawing shows a block diagram of the marked arrangement (FIG. 1) and a frequency / power diagram (FIG. 2).
  • An ultrasound generator 2 operated with line voltage 1 has a VCO 3 as a frequency generator.
  • a power measuring device 5 is inserted between this ultrasonic generator 2 and an ultrasonic transducer 4, the signal of which is fed to a differential amplifier 6.
  • This signal represents the "actual value”: on the other hand, the differential amplifier is supplied with a setpoint 7, ie an adjustable, stabilized DC voltage.
  • the amplified differential voltage that is to say the output voltage of the differential amplifier 6, then forms the control voltage for the VCO 3.
  • the curves shown in FIG. 2 in the power / frequency diagram correspond to the performance curves of the cleaning system under various operating conditions.
  • the lowest curve results in difficult operating conditions, e.g. low temperature, unfavorable fill level, low mains voltage etc., the highest curve with correspondingly positive parameters.
  • Common to all curves is the resonance frequency f. It can be seen directly from this diagram that, if this resonance frequency is observed, there are different outputs, ie different cleaning effects.
  • the frequency is regulated lower (or higher), in the example of curve 8 to the frequency f 1 , in that of curve 9 to the frequency f 2 .
  • the regulation provided according to the invention not only ensures that the power output of the cleaning system is always kept constant, but also that the ultrasound generator 2 and the ultrasound transducer 4 are overloaded due to excessive power consumption - curve 9 in resonance frequency will or damage to the items to be cleaned.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

The power delivery of ultrasonic cleaning systems is dependent on various parameters such as the liquid used, the level of fullness, the viscosity of the liquid, the temperature, the voltage etc. However, not only the power delivery and thus the cleaning effect are influenced by these parameters but also the power drain of the ultrasonic generator and of the associated sound transducer (oscillator). In order to limit the power drain of these devices and to achieve a power delivery which is independent of the aforesaid parameters, it is proposed according to the invention that the generator frequency be controlled as a function of the power drain of the transducer (4) via an effective power measuring device (5) which predetermines the actual value, the actual value being fed together with a reference value to a differential amplifier (6) and the differential signal being used to control a VCO (3) which determines the output frequency. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur Konstanthaltung der Leistungsabgabe von Ultraschall-Reinigungsanlagen mit einem (oder mehreren) auf die Reinigungsflüssigkeit einwirkenden Schallwandler (Schwinger), der von einem Ultraschall-Generator (HF-Generator) gespeist wird, sowie eine Anordnung zur Durchführung der Verfahrens.The invention relates to a method for keeping the power output of ultrasonic cleaning systems constant with one (or more) sound transducer (vibrator) acting on the cleaning liquid, which is fed by an ultrasonic generator (HF generator), and an arrangement for carrying out the method.

Die Ultraschall-Reinigung findet grundsätzlich in einer Flüssigkeit statt, die sowohl auf das Material wie auch die Struktur des Reinigungsgutes, als auch auf die Art der Verschmutzung abgestimmt sein muß. Zur Reinigung ausgenutzt werden hierbei die im Flüssigkeitsbad auftretenden hohen Zug- und Druckkräfte, die Kavitation bewirken, die wiederum die Schmutzpartikel von dem Reinigungsgut löst. Diese hohen Zug- und Druckkräfte beziehungsweise das Maximum der Kavitation werden allerdings nur dann erreicht, wenn das gesamte System in Resonanz ist. Die Resnnanzbedingungen verschieben sich jedoch sehr stark unter den Einfluß von Änderungen der verschiedensten Parameter, angefangen von Netz-Spannungsschwankunnen, bis zu Temperaturänderungen. Dies bedeutet, daß ein für eine bestimmte Leistung ausgelegtes System diese Leistung nur ausnahmsweise erreichen wird beziehungsweise daß auch die erstrebte Reinigungsleistung nur unter penibler Einhaltung der einzelnen Parameter-Grenzwerte zu erzielen ist. Dies wiederum würde einen sehr hohen apparativen und Bediepungsaufwand erfordern, so daß die Wirtschaftlichkeit derartiger Ultraschall-Reinigungsanlagen nicht mehr gewährleistet wäre. In der Praxis werden daher derartige Ultraschall-Reinigungsanlagen stets überdimensioniert, um auch unter ungünstigen Bedingungen noch eine genügende Reinigungswirkung zu erzielen. Dies bedeutet jedoch auch, daß die angestrebte Reinigungswirkung mehr oder weniger dem Zufall überlassen bleibt, daß also die Wirkung der Reinigungsanlage zwischen den beiden Extremen - einerseits zu geringe Reinigungswirkung, andererseits Schädigung des Reinigungsutes - schwanken kann und wird. Zu geringe Reinigungswirkung kann beispielsweise bereits bei einer Absenkung der Netzspannung, eine Schädigung bei erhöhter Netzspannung eintreten. Hinzu kommen dann noch weitere, sich zur Hinus- oder Plusseite addierende Imponderabilien, wie die mit dem Eintauchen des Reinigungsgutes verbundene Füllstandsänderung, die qleichzeitine Impedanzänderung durch das Einbringen des Reinigungsgutes, Viskositätsänderungen, Temperaturänderungen und dergleichen.Ultrasonic cleaning generally takes place in a liquid which must be matched to both the material and the structure of the items to be cleaned and the type of soiling. The high tensile and compressive forces which occur in the liquid bath and which cause cavitation, which in turn releases the dirt particles from the items to be cleaned, are used for cleaning. These high However, tensile and compressive forces or the maximum cavitation are only achieved when the entire system is in resonance. However, the resonance conditions shift very strongly under the influence of changes in a wide variety of parameters, from mains voltage fluctuations to temperature changes. This means that a system designed for a certain output will only achieve this output exceptionally or that the desired cleaning performance can only be achieved with meticulous observance of the individual parameter limit values. This in turn would require a very high outlay in terms of apparatus and operation, so that the economy of such ultrasonic cleaning systems would no longer be guaranteed. In practice, ultrasonic cleaning systems of this type are therefore always oversized in order to achieve a sufficient cleaning effect even under unfavorable conditions. However, this also means that the desired cleaning action is up to more or less randomly, ie that the effect of the cleaning system between the two extremes - may vary, and is - on the one hand g insufficient cleaning effect, on the other hand, damage to the Cleaner with sutes. A cleaning effect that is too low can, for example, damage the line voltage even when the line voltage drops. In addition there are further imponderables which add up to the plus or minus side, such as the change in fill level associated with the immersion of the items to be cleaned, the simultaneous change in impedance due to the introduction of the items to be cleaned, changes in viscosity, changes in temperature and the like.

Aufgabe der Erfindung ist es, ein Verfahren und eine Anordnung zur Durchführung des Verfahrens anzugeben, das die gleichbleibende, einstellbare Leistungsabgabe einer solchen Ultraschall-Reinigungsanlage gewährleistet.The object of the invention is to provide a method and an arrangement for carrying out the method, which ensures the constant, adjustable power output of such an ultrasonic cleaning system.

Erreicht wird dies nach der Erfindung dadurch, daß die Generatorfrequenz in Abhängigkeit von der Leistungsaufnahme des Wandlers geregelt wird.This is achieved according to the invention in that the generator frequency is regulated as a function of the power consumption of the converter.

Nicht mehr also wie bisher wird die Anlage stets im maximalen Arbeitspunkt betrieben, sondern dieser maximale Arbeitspunkt, also die Resonanzfrequenz, wird nur frequenzmäßig dann eingeregelt, wenn diese Leistung gefordert und auch durch dir oben angeführten Parameter bedingt, möglich ist. In allen anderen fällen arbeitet die Anlage außerhalb dieser maximalen Resonanzfrequenz, jedoch, wie angesrebt, stets auf dem gleichen, einstellbaren Leistungsniveau. Damit hleibt die Leistungsabgab der Ultrasehall-Reinigunsanlage nicht mehr dem Zufall überlassen, sondern ist exakt definierbar und, im gegebenen Rahmen, einstellbar. Unabhängig also von den verschiedenen Einwirkungen, wie Füllstands-, Viskositäts-, Temperatur- oder Spannungsschwankungen etc. wird sich immer die gleiche gewünschte Leistungsabgabe ergehen. Hervorzuheben ist, daß durch diese Art der Leistungsregelung keinerlei Verluste durch Vorschaltwiderstände etc. entstehen und auch, daß die Nachreoelung bei einer Änderung eines oder mehrerer Parameter praktisch verzögerungsfrei erfolgt.The system is no longer always operated at the maximum operating point as before, but this maximum operating point, i.e. the resonance frequency, is only adjusted in terms of frequency when this power is required and is also possible due to the parameters listed above. In all other cases, the system works outside of this maximum resonance frequency, but, as desired, always at the same, adjustable power level. This means that the power output of the ultrasound cleaning system is no longer left to chance, but is precisely definable and, within the given framework, adjustable. So regardless of the various effects, such as level, viscosity, temperature or voltage fluctuations, etc., the same desired power output will always occur. It should be emphasized that this type of power control does not result in any losses due to ballast resistors etc. and also that the re-oiling takes place practically without delay when one or more parameters change.

Zur Durchführung dieser Leistungsregelung wird nach der Erfindung vorgeschlagen, zwischen den Generator, dessen Ultraschallfrequenz mittels eines VCO (voltage controlled oscillator) bestimmt wird und dem Wandler eine Wirkleistungs-Meßeinrichtung zur Bildung des Istwertes einzufügen und dieser Meßeinrichtung einen Differenzverstärker nachzuschaltpn, dem zudem über ein Stellglied ein stabilisierter Sollwert zugeführt wird, dessen Ausgangsspannung, also die verstärkte Differenz zwischen Istwert und Sollwert, sodann den VCO steuert. Der Sollwert kann hierbei in üblicher Weise durch eine steuerbare, stabilisierte Gleichspannung oder eine entsprechende pulsierende Gleichspannung vorgegeben sein.To carry out this power control, it is proposed according to the invention to insert an active power measuring device to form the actual value between the generator, the ultrasonic frequency of which is determined by means of a VCO (voltage controlled oscillator) and the converter, and to connect this measuring device with a differential amplifier p n, which is also via an actuator is supplied with a stabilized setpoint whose output voltage, that is to say the amplified difference between the actual value and setpoint, then controls the VCO. In this case, the setpoint can be controlled in the usual way by a controllable, stabilized DC voltage or a corresponding pulsating DC voltage be given.

Auf der Zeichnung ist ein Blockschaltbild der gekennzeichneten Anordnung (Fig. 1) sowie ein Frequenz/Leistungsdiagramm (Fig. 2) dargestellt.The drawing shows a block diagram of the marked arrangement (FIG. 1) and a frequency / power diagram (FIG. 2).

Ein mit Netzspannung 1 betriebener Ultraschallgenerator 2 weist als Frequenzgeber einen VCO 3 auf. Zwischen diesem Ultraschallgenerator 2 und einem Ultraschall-Wandler 4 ist eine Leistungs-Meßeinrichtung 5 eingefügt, deren Signal einem Differenzverstärker 6 zugeleitet wird. Dieses Signal stellt den "Istwert" dar: andererseits wird den Differenzverstärker ein Sollwert 7 zugeführt, also eine stellbare, stabilisierte Gleichspannung. Die verstärkte Differenzspannung, also die Ausgangsspannung des Differenzverstärkers 6, bildet sodann die Steuerspannung für den VCO 3.An ultrasound generator 2 operated with line voltage 1 has a VCO 3 as a frequency generator. A power measuring device 5 is inserted between this ultrasonic generator 2 and an ultrasonic transducer 4, the signal of which is fed to a differential amplifier 6. This signal represents the "actual value": on the other hand, the differential amplifier is supplied with a setpoint 7, ie an adjustable, stabilized DC voltage. The amplified differential voltage, that is to say the output voltage of the differential amplifier 6, then forms the control voltage for the VCO 3.

Die in Fig. 2 in dem Leistungs/frequenzdiagramm gezeigten Kurven entsprechen den Leistungskurven der Reinigungsanlage bei verschiedenen Betriehszuständen. Die niedrigste Kurve ergibt sich bei erschwerten Betriebsbedingungen, also beispielsweise niedrige Temperatur, ungünstiger Füllstand, niedrige Netzspannung etc., die höchste Kurve bei entsprechend positiven Parametern. Gemeinsam ist sämtlichen Kurven die Resonanzfrequenz f . Es ist unmittelbar aus diesem Diagramm ersichtlich, daß bei Einhalten dieser Resonanzfrequenz sich jeweils unterschiedliche Leistungen ergeben, also auch unterschiedliche Reinigungswirkungen. Nach der Erfindung hingegen wird, um eine konstante Leistungsabgabe beizubehalten, die Frequenz tiefer (oder höher) geregelt, in Beispiel der Kurve 8 auf die Frequenz fl, in demjenigen der Kurve 9 auf die Frequenz f 2.The curves shown in FIG. 2 in the power / frequency diagram correspond to the performance curves of the cleaning system under various operating conditions. The lowest curve results in difficult operating conditions, e.g. low temperature, unfavorable fill level, low mains voltage etc., the highest curve with correspondingly positive parameters. Common to all curves is the resonance frequency f. It can be seen directly from this diagram that, if this resonance frequency is observed, there are different outputs, ie different cleaning effects. In contrast, according to the invention, in order to maintain a constant power output, the frequency is regulated lower (or higher), in the example of curve 8 to the frequency f 1 , in that of curve 9 to the frequency f 2 .

Durch die nach der Erfindung gegebene Regelung ist damit nicht nur gewährleistet, daß stets die Leistungsabgabe der Reinigungsanlage konstant gehalten wird, sondern auch, daß durch eine zu hohe Leistungsaufnahme - Kurve 9 in Resonanzfrequenz - der Ultraschallqenerator 2, wie auch der Ultraschall-Wandler 4 überlastet wird oder Schädigungen am Reinigungsgut entstehen.The regulation provided according to the invention not only ensures that the power output of the cleaning system is always kept constant, but also that the ultrasound generator 2 and the ultrasound transducer 4 are overloaded due to excessive power consumption - curve 9 in resonance frequency will or damage to the items to be cleaned.

Claims (2)

1. Verfahren zur Konstanthaltung der Leistungsabgabe von Ultraschall-Reinigungsanlagen mit einem (oder mehreren) auf die Reinigungsflüssigkeit einwirkenden Schall wandler (Schwinger), der von einem Ultraschall-Generator (HF-Generator) nespeist wird,
dadurch gekennzeichnet,
daß die Generatorfrequenz in Abängickeit von der Leistungsaufnahme des Wandlers geregelt wird.1. Method for keeping the power output of ultrasonic cleaning systems constant with one (or more) sound transducer (oscillator) acting on the cleaning liquid, which is fed by an ultrasonic generator (HF generator),
characterized,
that the generator frequency is regulated depending on the power consumption of the converter. 2. Anordnung zur Durchführung des Verfahrens nach Anspruch 1,
gekennzeichnet
durch eine zwischen dem Generator (2), dessen Ausganesfrequenz mittels eines VCO (vnltage controlled oscillator) (3) bestimmt wird und dem Wandler (4) eingefügte, zur Bildung des Istwertes bestimmte Wirkleistungs-Meßeinrichtung (5) und einen, dieser Meßeinrichtung (5) nachgeschalteten Differenzverstärker (6), dem über ein Stellglied ein Sollwert (7) zugeführt wird, dessen Ausgangsspannung sodann den VC0 (3) steuert.2. Arrangement for performing the method according to claim 1,
featured
by an active power measuring device inserted between the generator (2), the output frequency of which is determined by means of a VCO (vnltage controlled oscillator) (3), and the converter (4) to form the actual value device (5) and one, this measuring device (5) downstream differential amplifier (6), to which a setpoint (7) is fed via an actuator, the output voltage then controls the VC0 (3).
EP84109748A 1983-05-10 1984-08-16 Method and arrangement to maintain constant the power delivery of an ultrasonic cleaning system Withdrawn EP0172263A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19833317045 DE3317045A1 (en) 1983-05-10 1983-05-10 METHOD AND ARRANGEMENT FOR THE CONSTANT POWER DELIVERY OF ULTRASONIC CLEANING SYSTEMS
EP84109748A EP0172263A1 (en) 1983-05-10 1984-08-16 Method and arrangement to maintain constant the power delivery of an ultrasonic cleaning system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833317045 DE3317045A1 (en) 1983-05-10 1983-05-10 METHOD AND ARRANGEMENT FOR THE CONSTANT POWER DELIVERY OF ULTRASONIC CLEANING SYSTEMS
EP84109748A EP0172263A1 (en) 1983-05-10 1984-08-16 Method and arrangement to maintain constant the power delivery of an ultrasonic cleaning system

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EP0172263A1 true EP0172263A1 (en) 1986-02-26

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EP84109748A Withdrawn EP0172263A1 (en) 1983-05-10 1984-08-16 Method and arrangement to maintain constant the power delivery of an ultrasonic cleaning system

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DE (1) DE3317045A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0272084A2 (en) * 1986-12-15 1988-06-22 Baxter Diagnostics Inc. Ultrasonic horn driving apparatus and method with active frequency tracking
EP0335851A2 (en) * 1988-03-30 1989-10-04 Malmros Holding, Inc. Ultrasonic treatment of animals
US5665141A (en) * 1988-03-30 1997-09-09 Arjo Hospital Equipment Ab Ultrasonic treatment process
WO1997049500A1 (en) * 1996-06-26 1997-12-31 Kimberly-Clark Worldwide, Inc. An apparatus and method for controlling an ultrasonic transducer
EP1234566A1 (en) * 2001-02-23 2002-08-28 Matsushita Electric Works, Ltd. Ultrasonic cosmetic treatment device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3625149A1 (en) * 1986-07-25 1988-02-04 Herbert Dipl Ing Gaessler METHOD FOR PHASE-CONTROLLED POWER AND FREQUENCY CONTROL OF AN ULTRASONIC TRANSDUCER, AND DEVICE FOR IMPLEMENTING THE METHOD
EP0319631A1 (en) * 1987-11-09 1989-06-14 Emerson Electric Co. Method of controlling an ultrasonic generator
US5305737A (en) * 1988-03-30 1994-04-26 Arjo Inc. Ultrasonic treatment system
DE3840583A1 (en) * 1988-12-02 1990-06-07 Volker Ulrich Boehringer Process for the non-contact, eruptive removal of sediment and other deposits
US5585546A (en) * 1994-10-31 1996-12-17 Hewlett-Packard Company Apparatus and methods for controlling sensitivity of transducers
DE102005030777B4 (en) * 2005-07-01 2016-10-20 Martin Walter Ultraschalltechnik Ag Method and circuit arrangement for operating an ultrasonic vibrator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3975650A (en) * 1975-01-30 1976-08-17 Payne Stephen C Ultrasonic generator drive circuit
GB2099594A (en) * 1981-05-16 1982-12-08 Hilbre Ultrasonics Ltd Indicating power developed by ultrasonic transducer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3975650A (en) * 1975-01-30 1976-08-17 Payne Stephen C Ultrasonic generator drive circuit
GB2099594A (en) * 1981-05-16 1982-12-08 Hilbre Ultrasonics Ltd Indicating power developed by ultrasonic transducer

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0272084A2 (en) * 1986-12-15 1988-06-22 Baxter Diagnostics Inc. Ultrasonic horn driving apparatus and method with active frequency tracking
EP0272084A3 (en) * 1986-12-15 1989-08-02 Baxter International Inc. (A Delaware Corporation) Ultrasonic horn driving apparatus and method with active frequency tracking
EP0335851A2 (en) * 1988-03-30 1989-10-04 Malmros Holding, Inc. Ultrasonic treatment of animals
EP0335851A3 (en) * 1988-03-30 1991-03-13 Malmros Holding, Inc. Ultrasonic treatment of animals
US5665141A (en) * 1988-03-30 1997-09-09 Arjo Hospital Equipment Ab Ultrasonic treatment process
WO1997049500A1 (en) * 1996-06-26 1997-12-31 Kimberly-Clark Worldwide, Inc. An apparatus and method for controlling an ultrasonic transducer
US5892315A (en) * 1996-06-26 1999-04-06 Gipson; Lamar Heath Apparatus and method for controlling an ultrasonic transducer
US5900690A (en) * 1996-06-26 1999-05-04 Gipson; Lamar Heath Apparatus and method for controlling an ultrasonic transducer
EP1234566A1 (en) * 2001-02-23 2002-08-28 Matsushita Electric Works, Ltd. Ultrasonic cosmetic treatment device

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