EP0319631A1 - Procédé de commande d'un générateur ultrasonore - Google Patents

Procédé de commande d'un générateur ultrasonore Download PDF

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Publication number
EP0319631A1
EP0319631A1 EP87630233A EP87630233A EP0319631A1 EP 0319631 A1 EP0319631 A1 EP 0319631A1 EP 87630233 A EP87630233 A EP 87630233A EP 87630233 A EP87630233 A EP 87630233A EP 0319631 A1 EP0319631 A1 EP 0319631A1
Authority
EP
European Patent Office
Prior art keywords
ultrasonic
signal
ultrasonic generator
oscillator
digital
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Withdrawn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
EP87630233A
Other languages
German (de)
English (en)
Inventor
Ben Van Brakel
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.)
Emerson Electric Co
Original Assignee
Emerson Electric Co
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
Application filed by Emerson Electric Co filed Critical Emerson Electric Co
Priority to EP87630233A priority Critical patent/EP0319631A1/fr
Publication of EP0319631A1 publication Critical patent/EP0319631A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • B06B2201/72—Welding, joining, soldering

Definitions

  • the invention generally concerns a control for ul­trasonic generators and more particularly a control for the ultrasonic generator of ultrasonic cleaning equipment.
  • the power of an ultrasonic generator is rather depen­dent on a large number of parameters which may adverse­ly affect the operation of the generator.
  • the generator emits a quantity of acoustic energy to a medium; in the case of cleaning, this is usual­ly a liquid in which the objects to be cleaned have been placed.
  • the energy emitted to the medium accelerates the molecules in the medium, creating intramolecular spaces which implode if sufficient energy is supplied.
  • the resul­ting shockwaves knock particles off the objects placed in the liquid (cleaning), or alternatively it may happen that objects are damaged (by erosion) or even destroyed.
  • the quantity of energy applied is consequently important and has to be reproducible under all circumstances. Up until now ultrasonic equipment has generally been overdimensioned so as to ensure at least an acceptable cleaning result, with the risk that something might occasionally go wrong.
  • the power emitted by an ultrasonic generator depends in a cleaning device on a number of different parameters, such as the liquid used, the height of the liquid column, the viscosity, the temperature, surface tension of the liquid, loading of the cleaning tank, mains supply voltage, etc. These parameters do not only affect output power of the generator and cleaning power, but also the power input to the generator and its ability to transfer energy into the medium.
  • Medium is to be understood to mean the attached tank provided with any form of transfer element known as transducer.
  • the object of the invention is to improve the opera­tion of ultrasonic generator at a constant power output, especially cleaning devices as regards cleaning effect and power output from the ultrasonic generator.
  • Fig. 1 is shown schematically an overall general circuit diagram of a preferred embodiment of an ultrasonic generator according to the invention.
  • the ultrasonic gene­rator comprises an ultrasonic frequency power converter or oscillator U2 which is connected to a power supply U1 fed by mains.
  • the power supply U1 supplied in an appropriate form the energy needed to operate the ultrasonic generator. It comprises e.g. mains filter (if necessary), transfor­mer(s) or a switch-mode power supply, rectifiers and if necessary smoothing filters. Its components do not form a part of the claimed invention.
  • the oscillator or ultrasonic frequency power conver­ter U2 comprises a digitally controlled oscillator produ­cing output power at a frequency Fo.
  • the power output from the oscillator may be varied by changing or shifting its oscillation frequency or keeping its frequency constant at Fo, but modulating the pulse width thereof.
  • Ultrasonic transducers X1...X n are connected in parallel across the output terminals of the oscillator U2.
  • the number of transducers X1...X n is determined by the particular application.
  • the transducers may exhibit induc­tive, capacitive or resistive behaviour.
  • the voltage converter U3 is connected across the out­put terminals of the oscillator U2 to convert the voltage supplied to the transducers X1...X n into a digital real point voltage signal.
  • a current converter U4 is connected between the os­cillator U2 and the transducers X1...X n to convert the cur­rent supplied to the transducers X1...X n into a digital real point current signal.
  • the voltage and current converters U3 and U4 may also form a single power converter generating a digital real point signal.
  • the digital real point (voltage and current) signals are compared with corresponding set point signals in a comparator which may comprise a CPU U7 of a data processing system to produce a control signal when the real points do not agree with the set points.
  • This con­trol signal is fed to the oscillator U2 to either adjust the frequency thereof or to modulate the pulse width of its frequency to make the real point equal to the set point.
  • the CPU U7 is connected through a series/parallel addressed frequency oscillator U6 programmable for pulse-­width modulation and/or frequency shift to the ultrasonic frequency power converter or oscillator U2.
  • the hardware-based logic and/or central processor (CPU)U7 is connected in a preferred embodiment to a bidi­rectional input/output point U8 for parallel data trans­mission and via program switches SW1...SWn to a program instructor U9 comprising hardware, PROM, EPROM, CPU, soft­ware, etc.
  • the purpose of the unit U9 is to convert in a particular system to which the ultrasonic generator is applied to the operation parameters of the system and to send them via the CPU U7 to the series/parallel addressed frequency oscillator U6 in the preferred embodiment of the invention.
  • the operation parameters are entered into unit U9 through data/address lines 1...n.
  • the bidirectional input/output port U8 as parallel data transmission allows to enter data into the CPU under the control of the WRITE line from external sources or to display data in the CPU externally under the control of the READ line.
  • the FLAG indicates the digital cycle in which the CPU is located and enables this to be changed.
  • the CPU U7 is also connected to an RSC IN/OUT conver­ter U5 programmable for the correct RSC code and band rate for connection to a serial transmission line for periphe­ral connections, e.g. for changing the set point values by a remote control via a telephone line.
  • the CPU U7 is also connected to a potentiometer P1 for tuning the oscillator to a fundamental frequency Fo.
  • Fig. 2 shows a graph for ceramic transducer element showing the effect of the frequency of the impedance of the transducer; the centre frequency can be influenced by a pure Fo shift, but also by a fixed Fo which changes in pulse width.
  • the voltage is virtually constant.
  • the current is virtually constant.
  • the phase angle between current and voltage is practically identical in both cases, except that in the one case it is leading and in the other case it is lagging. In cases where the transducers behave resistive, both the I-converter and the U-converter are made active.
  • the energy emitted by ultrasonic oscillator U2 is measured in terms of current and/or voltage depen­ding on the transducers X1...X n and converted in converters U3 and/or U4 into a digital real point (voltage and/or cur­rent) signal which is compared in comparator or CPU U7 with a set point value.
  • the set point value may be obtained from "data/address" buses , PROM or software.
  • the frequency Fo of the oscillator U2 is either shifted or a pulse width modulation is applied to the frequency Fo of the oscillator U2 through unit U6 to make the real point equal to the set point.
  • the digitally controlled oscillator may have a frequency range approxi­mately from 20,000 to 100,000 Hz.
  • the digital control used in controlling the ultra­sonic generator of the invention is faster, more accurate easier to control then prior art control systems.
  • it is basically a cybernetic circuit which bears some resemblance to the natural motional feed­back that occurs in existing life-forms.
  • this system hay eyes, ears, hands and feet and is only limited by the available memory storage capa­city, which can of course easily be expanded.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
EP87630233A 1987-11-09 1987-11-09 Procédé de commande d'un générateur ultrasonore Withdrawn EP0319631A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP87630233A EP0319631A1 (fr) 1987-11-09 1987-11-09 Procédé de commande d'un générateur ultrasonore

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87630233A EP0319631A1 (fr) 1987-11-09 1987-11-09 Procédé de commande d'un générateur ultrasonore

Publications (1)

Publication Number Publication Date
EP0319631A1 true EP0319631A1 (fr) 1989-06-14

Family

ID=8198354

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87630233A Withdrawn EP0319631A1 (fr) 1987-11-09 1987-11-09 Procédé de commande d'un générateur ultrasonore

Country Status (1)

Country Link
EP (1) EP0319631A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0411473A2 (fr) * 1989-08-01 1991-02-06 Ferton Holding Générateur à ultrason avec un transducteur piézo-électrique
EP0424685A2 (fr) * 1989-10-27 1991-05-02 Storz Instrument Company Procédé pour commander un transducteur ultrasonore
US7491280B2 (en) 2003-04-30 2009-02-17 Schunk Ultraschalltechnik Gmbh Systems and methods for welding of parts

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3544866A (en) * 1969-10-16 1970-12-01 C & B Corp Electronic drive circuitry for ultrasonic devices
DE3317045A1 (de) * 1983-05-10 1984-11-15 Martin Walter Ultraschalltechnik GmbH, 7516 Karlsbad Verfahren und anordnung zur konstanten leistungsabgabe von ultraschall-reinigungsanlagen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3544866A (en) * 1969-10-16 1970-12-01 C & B Corp Electronic drive circuitry for ultrasonic devices
DE3317045A1 (de) * 1983-05-10 1984-11-15 Martin Walter Ultraschalltechnik GmbH, 7516 Karlsbad Verfahren und anordnung zur konstanten leistungsabgabe von ultraschall-reinigungsanlagen

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0411473A2 (fr) * 1989-08-01 1991-02-06 Ferton Holding Générateur à ultrason avec un transducteur piézo-électrique
EP0411473A3 (en) * 1989-08-01 1992-02-26 Ferton Holding Ultrasonic generator with a piezoelectric transducer
EP0424685A2 (fr) * 1989-10-27 1991-05-02 Storz Instrument Company Procédé pour commander un transducteur ultrasonore
EP0424685A3 (en) * 1989-10-27 1992-02-26 Storz Instrument Company Control system for calibrating and driving ultrasonic transducer
US7491280B2 (en) 2003-04-30 2009-02-17 Schunk Ultraschalltechnik Gmbh Systems and methods for welding of parts

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Inventor name: VAN BRAKEL, BEN