EP2016676A2 - Système d'alimentation pour dispositif à ultrasons - Google Patents

Système d'alimentation pour dispositif à ultrasons

Info

Publication number
EP2016676A2
EP2016676A2 EP07722330A EP07722330A EP2016676A2 EP 2016676 A2 EP2016676 A2 EP 2016676A2 EP 07722330 A EP07722330 A EP 07722330A EP 07722330 A EP07722330 A EP 07722330A EP 2016676 A2 EP2016676 A2 EP 2016676A2
Authority
EP
European Patent Office
Prior art keywords
ultrasonic device
parallel
resonant circuit
ultrasonic
series
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Withdrawn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
EP07722330A
Other languages
German (de)
English (en)
Inventor
Norbert FRÖHLEKE
Christopher Kauczor
Rongyuan Li
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.)
Universitaet Paderborn
Original Assignee
Universitaet Paderborn
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 Universitaet Paderborn filed Critical Universitaet Paderborn
Publication of EP2016676A2 publication Critical patent/EP2016676A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0138—Electrical filters or coupling circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0095—Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/4815—Resonant converters
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/80—Constructional details
    • H10N30/802—Circuitry or processes for operating piezoelectric or electrostrictive devices not otherwise provided for, e.g. drive circuits

Definitions

  • the invention relates to a feed arrangement for an ultrasonic device according to the preamble of patent claim 1.
  • DE 44 46 430 A1 discloses a drive arrangement for an ultrasonic device designed as an ultrasonic transducer, which comprises a control device with a network consisting of inductances and capacitances.
  • the network has a series resonant circuit whose resonant frequency is tuned to the frequency of a square wave signal provided by a square wave generator.
  • the frequency of the square wave generator also determines the frequency of the sinusoidal oscillation with which the ultrasonic device is acted upon.
  • a disadvantage of the known drive arrangement that the circuit is designed for low power and they can not be scaled up for the required power according to the invention due to the heavy load of the transistor and the capacitor arranged between two coils.
  • the circuit also requires a controllable voltage.
  • a pulsed width modulated signal is generated.
  • a pulse-width modulated signal can be generated, for example, by means of a pulse width modulation converter which is known from an article "Inverter Topologies for Ultrasonic Piezoelectric Transducers with High Mechanical Q-Factor" by C. Kauczor and N. Fröhleke, Proc. Of IEEE Power Electronics Specialists Conference (PESC) 2004.
  • This article describes the advantages and disadvantages of different devices for feeding ultrasound devices
  • the first variant describes a feed device with an LC converter, in which an inductance is connected in series This series resonant circuit is operated at a switching frequency which is close to the resonant frequency of the ultrasonic device, which advantageously allows to minimize distortion of the harmonics
  • An alternative feed arrangement may comprise a so-called LLCC converter having a p.sub.n. Arranged parallel to the ultrasonic device arranged parallel inductor and an upstream series resonant circuit.
  • this converter can react robustly to capacity fluctuations of the ultrasonic device.
  • a disadvantage is the higher stress on the components of the transducer and the greater distortion of upper vibrations.
  • a pulse width modulation converter (PWM converter) has been investigated, which advantageously allows a changed setting of the resonance frequency.
  • the components of the converter can be made smaller and lighter.
  • a disadvantage are the relatively high switching losses and the cooling costs for the components of the converter as a result of the increased switching frequency.
  • the food arrangements described in the article refer exclusively to ultrasonic devices with a relatively high mechanical vibration quality Qm.
  • the object of the present invention is to further develop a supply arrangement for an ultrasonic device in such a way that the efficiency and compactness are increased, in particular the distortion of harmonics being kept low and a local reactive power compensation of the ultrasonic device guaranteed.
  • the invention in connection with the preamble of claim 1, characterized in that the feed arrangement comprises an LLCC filter with a parallel to the ultrasonic device parallel inductance and a series resonant circuit comprising at least one series inductance and at least one series capacitance.
  • the combination of a pulse width modulation (PWM) converter with an LLCC filter increases the compactness of the feed arrangement, although this increases the number of components.
  • the components of the feed arrangement according to the invention can be made smaller, since the PWM converter causes a lower electrical load of the same.
  • the parallel inductance a compensation of the reactive power component of the ultrasonic device can be achieved, so that the components, such as the components of the series resonant circuit and the cable for connecting the actuator in a remote positioning, can be made smaller because of lower load.
  • the combination nation of the PWM converter with the LLCC filter that for tuning the feed arrangement to different ultrasound devices can be done trimming them with different frequencies to characterize them under large signal excitation and find out the optimal resonance modes.
  • the resource-consuming finite element analysis is then not required.
  • an optimized tuning between the feed arrangement and any ultrasound device can thereby be achieved.
  • the PWM converter allows the feed arrangement to act as an AC voltage source with a relatively low internal resistance, so that the transfer function of the ultrasonic device in the passband does not fluctuate greatly, so that the design of the power and control section is facilitated. Furthermore, as a result of load reduction, the weight as well as the cost of the service part can be reduced. In addition, the robustness of the filter to disturbances of the piezoelectric capacity Cp as a result of their copy variations and temperature influences on the actuator simplifies the design of power and control part considerably.
  • the resonance frequency of the overall resonant circuit can correspond to an integer multiple of the resonant frequency of the parallel resonant circuit or the operating frequency of the ultrasonic device.
  • the components of the series resonant circuit of the LLCC filter can be kept relatively small. Furthermore, the dynamic behavior is improved. Additional advantages of the invention will become apparent from the other dependent claims.
  • FIG. 1 shows a circuit diagram of a supply arrangement for ultrasonic actuators
  • FIG. 2 shows an output voltage signal (PWM output voltage) of a PWM converter of the supply arrangement
  • Figure 3 is a Bode diagram for a prior art supply arrangement including only a PWM converter (dashed line) and for a supply arrangement according to the invention comprising a PWM converter with LLCC filter.
  • a feed arrangement according to the invention for an ultrasound device 1 is shown in FIG. 1.
  • the ultrasonic motor can be used as a direct drive for aircraft, automobiles, robotic applications, and medical metering systems, while being associated with the medium-high damped piezoelectric vibration systems.
  • the ultrasonic device 1 can also be designed as an ultrasonic transducer or as an ultrasonic generating device with a sonotrode for ultrasound-assisted cutting, chiselling, milling, welding and the like, wherein they are assigned to the weakly damped piezoelectric vibration systems.
  • the ultrasonic device 1, usually referred to in the specialist literature as an ultrasonic actuator, has as a capacitive load a piezoelectric capacitor CP, which is preceded by a feed arrangement 3.
  • the feed arrangement 3 is connected to a DC voltage source 4 with the output voltage Ui.
  • the feed arrangement 3 comprises, on the one hand, the pulse-width-modulated converter (PWM converter 5), which is connected to the DC voltage source 4 and provides a pulse-width-modulated signal for a downstream series resonant circuit 6 as the PWM output voltage UPWM.
  • the PWM converter 5 can consist of a 3-point inverter, or else a 2-point inverter (H full bridge), which is controlled with optimized pulse patterns.
  • the series resonant circuit 6 consists of a series inductance Ls and a series capacitance Cs, which together with a parallel resonant circuit 7 form an LLCC filter 8 (overall resonant circuit).
  • the parallel resonant circuit 7 is formed by the capacitance CP of the ultrasound device 1 and a parallel inductance LP connected in parallel thereto.
  • 7 has the LLCC filter 8 between the series resonant circuit 6 and the parallel resonant circuit 7, a transformer 9.
  • the PWM converter 5 has four series-connected transistors Sl, S2, S3, S4, to each of which a diode is connected in parallel.
  • the transistors Sl, S2, S3, S4 are designed as self-locking N-channel MOS-FET transistors.
  • a downstream parallel branch is formed by two series-connected transistors S5, S6, which are formed as insulated gate bipolar transistors (IGBTs). The same one diode are connected in parallel.
  • a source terminal of the second transistor S2 forms the positive input terminal for the LLCC filter 8.
  • An emitter terminal of the transistor S5 forms the negative input terminal for the LLCC filter 8.
  • the driving of the transistors S1, S2, S6 enables the generation of a positive half-wave H1 and the driving of the transistors S3, S4, S5 the generation of a negative half-wave H2, as can be seen from FIG.
  • the different two stages of the two oscillations Hl, H2 result.
  • the connection between the transistors Sl and S2 and S3 and S4 are each connected via a diode D to a center terminal M of the input voltage source Ui.
  • the voltage signal UPWM present at the output of the PWM converter 5 is a high-frequency voltage signal whose fundamental frequency coincides with the resonance frequency of the ultrasonic device 1.
  • the PWM converter 5 is to be controlled in such a way that the switching frequency of the PWM converter 5 or the frequency of the output voltage UPWM of the PWM converter 5 corresponds to the operating frequency of the ultrasonic device 1.
  • the parallel inductance LP of the parallel resonant circuit 7 is matched to the parallel capacitance CP and the operating frequency ft * of the ultrasonic device 1.
  • the parallel inductance is calculated according to the following formula: 1
  • the second resonant frequency fo2 of the overall resonant circuit 8 may be an integer multiple of the resonant frequency of the parallel resonant circuit 7, for example, it may be three times as large as the frequency fM.
  • the invention thus relates in particular to a powerful 3-point inverter which is driven by a pulse width modulator in accordance with the pulse pattern (see FIG.
  • the generated inverter voltage serves as an input signal for the LLCC band-pass filter, which still contains a transformer for potential separation and, in the case of remote ultrasonic actuators, also contains a cable and produces a low-harmonic, broadband voltage of the actuator.
  • the filter uses the capacity of the ultrasonic actuator, the cable capacitance and the stray inductance of the transformer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Dc-Dc Converters (AREA)

Abstract

L'invention concerne un convertisseur trois points de puissance qui est commandé par un modulateur de durée d'impulsion, conformément à un modèle d'impulsion (voir Fig.2). La tension générée par le convertisseur est utilisée comme signal d'entrée pour le filtre passe-bande LLCC, comprenant une inductance parallèle, montée en parallèle avec le dispositif à ultrasons, et un circuit oscillant série renfermant au moins une inductance série et au moins une capacité série. Pour la séparation du potentiel, le filtre LLCC renferme en outre le transformateur, et également un câble, dans le cas où des actionneurs à ultrasons sont montés à distance. Une tension large bande, pauvre en oscillations harmoniques de l'actionneur peut ainsi être produite. Le filtre utilise la capacité de l'actionneur ultrasonique, la capacité du câble - dans le cas où un câble est nécessaire pour la connexion - et l'inductance de fuite du transformateur.
EP07722330A 2006-05-08 2007-04-30 Système d'alimentation pour dispositif à ultrasons Withdrawn EP2016676A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006021559A DE102006021559A1 (de) 2006-05-08 2006-05-08 Speisenanordnung für eine Ultraschallvorrichtung
PCT/DE2007/000773 WO2007128271A2 (fr) 2006-05-08 2007-04-30 Système d'alimentation pour dispositif à ultrasons

Publications (1)

Publication Number Publication Date
EP2016676A2 true EP2016676A2 (fr) 2009-01-21

Family

ID=38325510

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07722330A Withdrawn EP2016676A2 (fr) 2006-05-08 2007-04-30 Système d'alimentation pour dispositif à ultrasons

Country Status (4)

Country Link
US (1) US20090302932A1 (fr)
EP (1) EP2016676A2 (fr)
DE (1) DE102006021559A1 (fr)
WO (1) WO2007128271A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010029507A1 (de) * 2010-05-31 2011-12-01 Robert Bosch Gmbh Verfahren und Vorrichtung zur Erzeugung von diskreten Werten eines Stromes mittels einer Induktivität zur Begrenzung eines Erregerstromes für einen Kraftfahrzeuggenerator
CN102377186B (zh) * 2010-08-20 2016-03-23 华东电力试验研究院有限公司 动态无功补偿的方法及系统
CN109893782A (zh) * 2019-03-19 2019-06-18 深圳市声科生物医学研究院 一种hifu设备功率源及设备

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5198713A (en) * 1989-04-19 1993-03-30 Olympus Optical Co., Ltd. Ultrasonic transducer apparatus
DE4446430C2 (de) 1994-12-23 1997-03-20 Siemens Ag Treiberschaltung für einen piezoelektrischen Ultraschallwandler
JPH11204850A (ja) * 1998-01-09 1999-07-30 Nec Corp ピエゾ駆動回路
KR100325263B1 (ko) * 1998-12-21 2002-06-26 손동준 입력조정이가능한압전소자구동회로및그의제어방법
DE10009174A1 (de) 2000-02-26 2001-09-20 Wilhelm Aichele Ultraschall-Bearbeitungsvorrichtung und Ultraschall-Bearbeitungsverfahren
DE10130351A1 (de) * 2001-06-22 2003-01-02 Thomas Schulte Schaltung zur Speisung resonant betriebener piezokeramischer Wandler mit überlagerter Gleichspannung
US8061014B2 (en) * 2007-12-03 2011-11-22 Covidien Ag Method of assembling a cordless hand-held ultrasonic cautery cutting device
US20090143800A1 (en) * 2007-12-03 2009-06-04 Derek Dee Deville Cordless Hand-Held Ultrasonic Cautery Cutting Device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007128271A2 *

Also Published As

Publication number Publication date
WO2007128271A2 (fr) 2007-11-15
DE102006021559A1 (de) 2008-11-13
US20090302932A1 (en) 2009-12-10
WO2007128271A3 (fr) 2008-01-03

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