EP3005551A1 - Oscillateur haute fréquence, système de soudage haute fréquence et procédé de régulation de fréquence au moyen d'un tel oscillateur haute fréquence - Google Patents

Oscillateur haute fréquence, système de soudage haute fréquence et procédé de régulation de fréquence au moyen d'un tel oscillateur haute fréquence

Info

Publication number
EP3005551A1
EP3005551A1 EP14728816.1A EP14728816A EP3005551A1 EP 3005551 A1 EP3005551 A1 EP 3005551A1 EP 14728816 A EP14728816 A EP 14728816A EP 3005551 A1 EP3005551 A1 EP 3005551A1
Authority
EP
European Patent Office
Prior art keywords
frequency
inductance
frequency oscillator
circuit
oscillator
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Withdrawn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
EP14728816.1A
Other languages
German (de)
English (en)
Inventor
Fernando MARTINEZ VELA
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.)
Kiefel GmbH
Original Assignee
Kiefel 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
Application filed by Kiefel GmbH filed Critical Kiefel GmbH
Publication of EP3005551A1 publication Critical patent/EP3005551A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • B29C66/951—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools
    • B29C66/9512—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94 by measuring or controlling the vibration frequency and/or the vibration amplitude of vibrating joining tools, e.g. of ultrasonic welding tools by controlling their vibration frequency
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B1/00—Details
    • H03B1/02—Structural details of power oscillators, e.g. for heating
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
    • H03B5/1256—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a variable inductance
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/20—Continuous tuning of single resonant circuit by varying inductance only or capacitance only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/22—Continuous tuning of single resonant circuit by varying inductance and capacitance simultaneously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/95—Measuring or controlling the joining process by measuring or controlling specific variables not covered by groups B29C66/91 - B29C66/94
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/215—Frequency-selective devices, e.g. filters using ferromagnetic material
    • H01P1/217—Frequency-selective devices, e.g. filters using ferromagnetic material the ferromagnetic material acting as a tuning element in resonators

Definitions

  • the invention relates to a high-frequency oscillator with the features of the preamble of claim 1. Furthermore, the invention relates to a high-frequency Sch obtain- anläge for high-frequency welding of plastic films with at least one such high-frequency oscillator and a method for frequency control with a such high-frequency oscillator.
  • high-frequency welding systems are usually used.
  • the plastics are carried out between electrodes and heated by a high-frequency alternating electromagnetic field. At their contact points, the plastic films are welded together.
  • the highest possible operating frequency is set by means of high-frequency oscillators, which is for example in the range between 25 and 30 megahertz.
  • the high-frequency oscillators used for this purpose are constructed as so-called "solid-state" generators, ie have no transmitter tubes for the frequency conversion, but instead have corresponding semiconductor components for converting the DC power into a high-frequency AC power supply wear-resistant and are relatively insensitive to mechanical stress.
  • the inductance of the corresponding electronic component of the electrical oscillating circuit which is usually formed at least by a coil, mechanically influenced for this scheme.
  • a ferromagnetic core is moved more or less far into the coil or influences the generated magnetic field by a highly conductive core.
  • the inductance can be regulated and the resonant circuit can be set to a setpoint frequency even when the load changes.
  • the invention is based on the object to eliminate the disadvantages of the prior art and in particular to provide a way with which a wear-free frequency control is possible and which has a high control quality even with fast load changes.
  • a high-frequency oscillator with an electrical oscillating circuit which has at least one electronic component with an inductance and at least one capacitor
  • at least one magnetic coil is assigned to the electronic component, with which the inductance of the electronic component can be influenced electronically.
  • the influencing of the inductance is thus not effected by mechanical movement of a ferromagnetic core or by a displacement of the magnetic field, but by electronic influence.
  • a magnetic field is generated with at least one magnetic coil, so that the inductance of the electronic component is influenced.
  • a very high speed of the frequency tracking is possible even with fast load changes, the influence on the inductance carried out without mechanical adjustment and thus is not subject to mechanical wear.
  • there is a magnetic resonance circuit tuning This results in a very accurate frequency control without noticeable overshoot tendency. Overall, this results in a high control quality.
  • the magnetic coil is incorporated in a control circuit for frequency control of the high-frequency oscillator.
  • the magnetic coil is operated with DC voltage.
  • the inductance can be adjusted continuously.
  • the maximum inductance of the electronic component is utilized when the magnetic coil is de-energized.
  • the magnetic coil is charged with maximum current, thus minimizing the inductance.
  • the frequency of the electrical oscillating circuit of the high-frequency oscillator can be sensitively controlled.
  • the magnetic coil is wound from a ring of ferromagnetic material. The maximum current that can be passed through the solenoid then depends on when the ring of ferromagnetic material reaches saturation.
  • the electronic component has at least one copper tube, which is guided through the magnetic coil.
  • several copper tubes are provided, which are guided by one or more magnetic coils.
  • higher powers are adjustable.
  • the design of the electronic component with one or more copper tubes results in a high-frequency coil with corresponding quality. This also enables high performance to be implemented.
  • the high-frequency oscillator is designed as a high-frequency generator.
  • it is particularly suitable for providing a stable, high-frequency AC voltage, as required for example in high frequency welding systems.
  • a high-frequency welding system for the high-frequency welding of plastics with at least one high-frequency oscillator according to any one of claims 1 to 6 according to the invention in that the high-frequency oscillator in a high-frequency Circle and / or a load circuit of the high-frequency welding system is integrated. From the high-frequency circuit while a high-frequency AC voltage is transferred to the load circuit and forwarded there to the electrode and counter electrode. With the high-frequency oscillator according to the invention then on the one hand, the output frequency of the high-frequency circuit can be controlled very accurately, but also the resonant frequency or impedance in the load circuit.
  • a good frequency stabilization succeeds in the high-frequency circuit, wherein the high-frequency oscillator operates as a high-frequency generator.
  • the high-frequency oscillator operates as a high-frequency generator.
  • a good resonance tracking and / or power excitation as well as a precise impedance adjustment can take place.
  • the high-frequency welding system has a higher-level control for frequency tuning in the high-frequency circuit and for resonant frequency tuning in the load circuit.
  • This achieves a high control quality.
  • an optimal working frequency of the load circuit can be set, which may possibly even be done via an automatic search, is operated by appropriate stepwise change in the inductance of the arranged in the high-frequency circuit high-frequency oscillator with different output frequencies until an optimum is reached.
  • the object mentioned at the outset is also achieved by a method for frequency regulation with a high-frequency oscillator according to one of Claims 1 to 6, in particular in a high-frequency welding system according to one of Claims 7 or 8, according to the invention in that a frequency of the High-frequency oscillator through electronic adjustment of an inductance is regulated wear-free. Since no moving parts are required to influence the inductance, no mechanical wear occurs. Furthermore, no overshoot due to the inertia of mechanical components is to be feared. Thus, a very short response time of less than 5 milliseconds is achievable, so a very fast frequency control.
  • the inductance is adjusted by applying a DC voltage to magnetic coils. This allows a very fast, sensitive influencing of the inductance and thus of the output frequency of the high-frequency oscillator.
  • an impedance of the electrical resonant circuit is set by adapting the inductance. This results in extended application possibilities for the high-frequency oscillator, for example in the load circuit.
  • the inductance is changed in an automatic search stepwise or continuously until an optimal frequency is obtained in the load circuit.
  • the high-frequency welding system can be operated after passing through the automatic search with the optimum operating frequency in the load circuit. This means that very good welding results can be achieved reliably and reproducibly
  • the electronic adjustment of the inductance is used to tune the load circuit of amplifiers.
  • an amplifier supplies an output impedance of 50 ohms, it will face a real resistance in the load circuit of 50 ohms.
  • the tuning of the amplifier with the load circuit is carried out according to the prior art with adjustable vacuum capacitors, which are adjusted for example via stepper motors. Instead of the capacitive tuning, the tuning according to the invention can also be carried out inductively.
  • Fig. 1 is a schematic diagram of the high-frequency oscillator and Fig. 2 is a schematic diagram of a high-frequency welding system.
  • FIG. 1 shows a schematic representation of a high-frequency oscillator 1, which comprises an electrical oscillating circuit 2.
  • the electrical resonant circuit 2 is provided as an electronic component 3, which provides an inductance L, a coil.
  • the resonant circuit comprises a capacitor 4 with a capacitance C. It is therefore of the basic structure to a conventional LC resonant circuit.
  • the electronic component 3 is formed as a coil with at least one copper tube. But it can also be provided a plurality of coils and a plurality of capacitors.
  • the electronic component 3 is guided by a ring 5 made of a ferromagnetic material around which a magnetic coil 6 is wound.
  • the magnetic coil 6 is integrated in a control circuit 8, which has a controllable DC power source 7.
  • FIG. 2 shows a schematic representation of a high-frequency welding system 9 for high-frequency welding of plastic films, with a first high-frequency oscillator according to the invention in a high-frequency generator 20 generating a high-frequency output oscillation in a high-frequency circuit 21 is provided and is transmitted via a coax connection 10 to a load circuit 1 1.
  • the load circuit 1 1 is a magnetic resonance circuit 12, via which an electrode 13 and a counter electrode 14 are supplied with a corresponding high-frequency voltage. Between electrode 13 and counter electrode 14, the material to be welded is performed. In this case, it is necessary to match the pending load, which is influenced, for example, by the thickness of the material to be welded.
  • a second magnetically tunable resonant circuit according to the invention is provided in FIG. 12, which comprises an electronic influencing of its inductance, such as the high-frequency oscillator.
  • a higher-level controller 15 For frequency tuning in the high-frequency circuit 21 by means of the first inventive high-frequency oscillator and for setting a resonant frequency in the load circuit 11 by means of the second magnetic resonance circuit, a higher-level controller 15 is provided. Control signals of the higher-level controller are transmitted via corresponding driver elements 16, 17 and amplifiers 18, 19 to the control circuit 8 for frequency control of the first high-frequency oscillator in the high-frequency circuit 21 or to a corresponding control circuit 22 of the second magnetic resonance circuit arranged in the load circuit 11. As a result, a complete control of the high-frequency welding system is possible, with an optimal operating point adjustment takes place.
  • the high-frequency oscillator according to the invention can be used for impedance regulation or regulation of the resonant frequency in the load circuit of a high-frequency welding system.
  • a very high control quality and high control speed can be achieved.
  • a possibly higher power consumption can lead to increased temperature development, which can be absorbed by additional cooling, for example with air or water.
  • this results in a very high frequency stabilization and a good tuning of the load circuit, whereby an automatic search for the optimal operating frequency of the load circuit can be done.
  • the tracking of the resonance circuit frequency is wear-free and electronic way.
  • the impedance adjustment can be done electronically.
  • the respective frequency of the oscillator is electronically adjusted by magnetic coils.
  • the invention is not limited to the exemplary embodiments shown, but can be modified in many ways.
  • a plurality of magnetic coils each having a ferromagnetic material ring may be used.
  • the use of the high-frequency oscillator according to the invention is not only possible as a high-frequency generator for generating high-frequency voltages or currents, but also, for example, for sensitive high-pass or low-pass filters.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Inverter Devices (AREA)

Abstract

L'invention concerne un oscillateur haute fréquence (1) comprenant un circuit résonant électrique (2), un système de soudage haute fréquence ainsi qu'un procédé de régulation de fréquence au moyen d'un oscillateur haute fréquence, notamment dans un système de soudage haute fréquence. Le circuit résonnant électrique (2) comprend au moins un composant électronique (3) présentant une inductance et au moins un condensateur (4) présentant une capacité. Afin de permettre une régulation rapide et sans usure de la fréquence du circuit résonnant électrique, au moins une bobine d'électro-aimant supplémentaire (6) est associée au composant électronique (3) et permet d'influer électroniquement sur l'inductance du composant électronique (3).
EP14728816.1A 2013-05-24 2014-04-08 Oscillateur haute fréquence, système de soudage haute fréquence et procédé de régulation de fréquence au moyen d'un tel oscillateur haute fréquence Withdrawn EP3005551A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102013008730 2013-05-24
DE102013021062 2013-12-18
PCT/DE2014/000176 WO2014187439A1 (fr) 2013-05-24 2014-04-08 Oscillateur haute fréquence, système de soudage haute fréquence et procédé de régulation de fréquence au moyen d'un tel oscillateur haute fréquence

Publications (1)

Publication Number Publication Date
EP3005551A1 true EP3005551A1 (fr) 2016-04-13

Family

ID=50897315

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14728816.1A Withdrawn EP3005551A1 (fr) 2013-05-24 2014-04-08 Oscillateur haute fréquence, système de soudage haute fréquence et procédé de régulation de fréquence au moyen d'un tel oscillateur haute fréquence

Country Status (5)

Country Link
US (2) US10239261B2 (fr)
EP (1) EP3005551A1 (fr)
CN (1) CN105247780B (fr)
DE (2) DE102014003868A1 (fr)
WO (1) WO2014187439A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2062427A (en) * 1979-10-23 1981-05-20 Tetra Pak Int Electromagnetic sealing device
US4309586A (en) * 1978-09-27 1982-01-05 Toyo Seikan Kaisha, Ltd. High frequency induction heating circuit

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Publication number Priority date Publication date Assignee Title
DE738825C (de) 1936-02-11 1943-09-02 Ladislaus Von Kramolin Verfahren zur selbsttaetigen Scharfabstimmung von elektrischen Schwingungskreisen
US3654546A (en) * 1966-10-25 1972-04-04 Wanlass Electric Co Method and apparatus for regulating voltage by utilizing the stable oscillation state of a parametric device
US4020440A (en) * 1975-11-25 1977-04-26 Moerman Nathan A Conversion and control of electrical energy by electromagnetic induction
SE403414B (sv) * 1977-03-21 1978-08-14 Tetra Pak Int Resonator forsedd med anordning for avstemning av resonansfrekvensen samt don for alstrande av dielektriskt verme i tunna folier
US4791542A (en) * 1987-08-03 1988-12-13 Rfl Industries, Inc. Ferroresonant power supply and method
IT1315069B1 (it) 2000-12-22 2003-01-27 Aurelio Ferraboli Generatore di potenza per saldatura ad ultrasuoni con controllodigitale della frequenza e della potenza
DE102004049060B4 (de) * 2003-10-16 2010-04-01 Neue Materialien Bayreuth Gmbh Verfahren zur Herstellung von Formkörpern aus Polymerschaumpartikeln
JP2007174552A (ja) 2005-12-26 2007-07-05 Renesas Technology Corp 発振回路およびそれを内蔵した半導体集積回路
US7889026B2 (en) * 2008-01-08 2011-02-15 Harris Corporation Electronically variable inductor, associated tunable filter and methods
KR20090076520A (ko) * 2008-01-09 2009-07-13 삼성전자주식회사 가변 인덕터 및 광대역 전압 제어 발진기
US8044732B2 (en) 2008-02-12 2011-10-25 International Business Machines Corporation Continuously tunable inductor and method to continuously tune an inductor
CN201227866Y (zh) * 2008-04-30 2009-04-29 林瑞添 熔接机改良结构
US9820339B2 (en) 2011-09-29 2017-11-14 The Boeing Company Induction heating using induction coils in series-parallel circuits
CN102917483A (zh) * 2012-06-07 2013-02-06 杨蒙 一种电磁感应加热装置
CN102891539A (zh) 2012-10-19 2013-01-23 天津工业大学 无线电能传输系统自激跟踪功率放大器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4309586A (en) * 1978-09-27 1982-01-05 Toyo Seikan Kaisha, Ltd. High frequency induction heating circuit
GB2062427A (en) * 1979-10-23 1981-05-20 Tetra Pak Int Electromagnetic sealing device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2014187439A1 *

Also Published As

Publication number Publication date
DE102014003868A1 (de) 2014-11-27
US10239261B2 (en) 2019-03-26
US20160067915A1 (en) 2016-03-10
US20190039327A1 (en) 2019-02-07
CN105247780B (zh) 2020-08-28
WO2014187439A1 (fr) 2014-11-27
DE112014002546A5 (de) 2016-05-04
CN105247780A (zh) 2016-01-13

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