EP3324704A1 - Anti-shock-vorrichtung für hochfrequenzschweisseinrichtung - Google Patents

Anti-shock-vorrichtung für hochfrequenzschweisseinrichtung Download PDF

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Publication number
EP3324704A1
EP3324704A1 EP17202457.2A EP17202457A EP3324704A1 EP 3324704 A1 EP3324704 A1 EP 3324704A1 EP 17202457 A EP17202457 A EP 17202457A EP 3324704 A1 EP3324704 A1 EP 3324704A1
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EP
European Patent Office
Prior art keywords
triode
contact
grid
resistance
locking
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.)
Granted
Application number
EP17202457.2A
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English (en)
French (fr)
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EP3324704B1 (de
Inventor
Marco Fabiano
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.)
Geaf SpA
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G E A F Srl
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Publication date
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Publication of EP3324704A1 publication Critical patent/EP3324704A1/de
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Publication of EP3324704B1 publication Critical patent/EP3324704B1/de
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/46—Dielectric heating
    • H05B6/48—Circuits
    • H05B6/50—Circuits for monitoring or control

Definitions

  • the present invention falls within the field of high-frequency electronic welding machines and more precisely, it relates to an anti-shock device for said welding machines.
  • Electronic presses or welding machines generally comprise a class C oscillator comprising a triode provided with a control electrode (grid) on the supply line.
  • the triode supplies a resonant circuit which in turn supplies a user, said user for example consisting of the mold holding plates of a welding press.
  • Anti-shock devices which have the purpose of identifying discharges occurring between the mold holding plates of the press.
  • the anti-shock device must block the triode as fast as possible in order to block the supply of high frequency energy thereof:
  • the grid When the oscillator is working normally, the grid is traversed by a negative grid current, consisting of a flow of electrons traversing the grid resistance to earth.
  • a negative locking voltage of the same sign but of greater value than the operating one, so as to prevent it.
  • the locking voltage in fact creates a potential barrier on the negative control electrode so that the electrons are repelled rather than attracted, blocking the triode conduction.
  • the prior art anti-shock devices consist of an input device configured to measure the resistance between the electrodes by means of a discharge sensor essentially consisting of a filter connected directly to the mold electrode powered by high frequency energy.
  • the discharge sensor measures the continuous resistance between the electrodes during welding and this resistance is compared to a preset sample value on a potentiometer referred to as sensitivity potentiometer.
  • sensitivity potentiometer When the resistance on the electrodes becomes lower than the preset (slowly or rapidly) or when a discharge occurs between the plates of the press which tends to short circuit, then the anti-discharge device sends a negative locking voltage to the grid electrode to block the triode and just as quickly break the contactors that give the high voltage.
  • the system responsible for generating the locking voltage consisting of a power supply with a battery of capacitors with diodes for having a continuous voltage, must supply a resistance closed to earth, i.e. the grid resistance, and must be able to maintain this very high voltage for the time it takes for the oscillator to stop oscillating and for as long as the high voltage takes to reach very low or zero values.
  • the energy that the power supply must supply is linked to the value of the self-polarization resistance (small resistance, higher circulating current).
  • the anti-shock devices of the known type therefore have some drawbacks, among which is therefore that of requiring high power transformers for the power supply system.
  • the intervention times are high and therefore do not guarantee the sudden ceasing of electrical discharges between the mold holding electrodes, with consequent wear thereof, in addition to the damage of the interposed material to be welded, particularly in high power welding machines for welding of non-high thicknesses and without insulators.
  • An object of the present invention is to provide an improved device, configured to intervene in a much quicker way, when the resistance between the molds of the welding press reaches a value lower than a predetermined value, so as to open the supply circuit of the triode grid and lock the latter, to avoid the formation of arcs or discharges between the molds.
  • an embodiment of the present invention provides an anti-shock device of high frequency welding machines, wherein said welding machines comprise at least one oscillator in class C and a triode provided with a control electrode (grid) on the supply line; the triode configured to power a resonant circuit which in turn powers the mold holding plates of said welding machine.
  • the device comprises:
  • the device further comprises at least two bipolar transistors in series and suitable for grounding the positive side of the bridge; the control unit is connected to a contact, for example of the normally open type, connected in series between the grid resistance and the ground.
  • the method for controlling and locking the triode of high-frequency welding machines, by a control unit 11 according to the device of claim 1 provides for:
  • the transistors are in fact configured and designed in series to have greater resistance to the high voltages of the application (1500V). This leads to a greater rapidity of intervention (in the order of microseconds).
  • Another aspect of the invention provides for the transistors inserted into the triode locking circuit.
  • Another aspect of the invention is that said transistors are supplied by the control unit.
  • Another aspect of the invention is that the negative poles of the capacitors supplied by the rectifier bridge are connected to the triode grid through a diode with bridge protective function.
  • Another aspect of the invention is that said at least two bipolar transistors in series are of the IGBT type.
  • Another aspect of the invention is to provide a third bipolar transistor of the IGBT type to protect the contact.
  • Another aspect of the invention is that the contact is configured not to open the current circuit so that, with this solution, the criticality of the spark effect is avoided.
  • the anti-shock according to the present invention is associated with a control unit 11 which can be connected to a discharge sensor 12 of the mold holding plates of the welding machine and adapted to make a comparison with a preset sample value.
  • reference numeral 1 indicates an anodic plate of a high frequency welding press while reference numeral 2 indicates the cathode plate connected to earth 3.
  • the anodic plate also called hot plate, is fed by a high frequency class C oscillator 4 comprising a valve or triode 5 whose anode 6 is connected to a resonant circuit 7.
  • Triode 5 has a cathode 8 connected to earth and a control grid 9 also connected to earth through a self-polarization resistance 10 of the grid.
  • a connection 26 for the sectioning of the anionic voltage of triode 5 may be provided, although not necessary.
  • Reference numeral 11 indicates the control unit connected to the discharge sensor 12 which detects the resistance value between the two anode 1 and cathode 2 plates.
  • the resistance value detected by sensor 12 is compared with a preset value by means of a potentiometer sensitivity setter 13 or of the step selector type.
  • Reference numeral 27 indicates a connection for the welding control which supplies the circuit of the control unit 11 when the press begins to weld.
  • the control unit 11 processes the data received and, when the resistance values between the plates decrease very rapidly, it sends signals via connections 14 and 15 to a triode locking unit of indicated as a whole with reference numeral 16.
  • the triode locking unit 16 comprises a transformer 17 which powers a voltage doubler rectifier bridge 18 which in turn powers a battery of capacitors 30, for example a first and a second capacitor 19 and 20.
  • Reference numeral 21 indicates at least two IGBT bipolar transistors in series which are inserted in the triode locking circuit of the anti-shock device and are powered by connection 14 coming from the control unit and whose function is to connect the positive side of bridge 18 to earth.
  • diode 22 has the function of protecting the bridge.
  • Unit 16 further comprises a contact 24, preferably of the normally open type, inserted in series between the grid resistance 10 and earth 3.
  • a capacitive impedance 25 for holding the pulse is provided in parallel to contact 24.
  • a locking relay 23 which can receive an activation command from connection 15 coming from the control unit.
  • the signals are sent from the control unit to the triode locking unit.
  • the signal coming from the control unit, through connection 14, controls the two IGBT bipolar transistors 21, or BJT transistor (bipolar junction transistor); they are arranged in series and arranged in order to input the pulse which closes capacitors 19 and 20 to earth for locking the triode.
  • BJT transistor bipolar junction transistor
  • connection 15 de-energizes the locking relay 23 which acts as a switch and opens the grid resistance circuit 10.
  • the negative voltage is applied to the grid.
  • the locking relay 23 is configured not to open the current circuit so that, with this solution, the criticality of the spark effect is avoided.
  • bipolar transistors 21 and relay 23 allows a locking pulse to be realized for a sufficient time after which the diode is completely defused, i.e. the oscillation is locked.
  • the indicated components provide for the protection of contact 24.
  • the contact branch in current can be opened without producing the annoying spark; the presence of the third transistor creates continuity so that the contact opening is not in critical conditions.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Arc Welding Control (AREA)
  • Generation Of Surge Voltage And Current (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
EP17202457.2A 2016-11-17 2017-11-17 Anti-shock-vorrichtung für hochfrequenzschweisseinrichtung Active EP3324704B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102016000116587A IT201600116587A1 (it) 2016-11-17 2016-11-17 Dispositivo antiscarica per saldatrici elettroniche ad alta frequenza

Publications (2)

Publication Number Publication Date
EP3324704A1 true EP3324704A1 (de) 2018-05-23
EP3324704B1 EP3324704B1 (de) 2020-10-28

Family

ID=58228505

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17202457.2A Active EP3324704B1 (de) 2016-11-17 2017-11-17 Anti-shock-vorrichtung für hochfrequenzschweisseinrichtung

Country Status (2)

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EP (1) EP3324704B1 (de)
IT (1) IT201600116587A1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10222590A1 (de) * 2001-05-22 2002-11-28 Generatori Elettronici Alta Fr Entladungsschutzvorrichtung für elektronische Hochfrequenz-Schweissgeräte

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10222590A1 (de) * 2001-05-22 2002-11-28 Generatori Elettronici Alta Fr Entladungsschutzvorrichtung für elektronische Hochfrequenz-Schweissgeräte

Also Published As

Publication number Publication date
EP3324704B1 (de) 2020-10-28
IT201600116587A1 (it) 2018-05-17

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