CN109079286B - TIG welding power isolation interface circuit - Google Patents
TIG welding power isolation interface circuit Download PDFInfo
- Publication number
- CN109079286B CN109079286B CN201810978844.1A CN201810978844A CN109079286B CN 109079286 B CN109079286 B CN 109079286B CN 201810978844 A CN201810978844 A CN 201810978844A CN 109079286 B CN109079286 B CN 109079286B
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- circuit
- welding power
- tig welding
- voltage
- power supply
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- 238000003466 welding Methods 0.000 title claims abstract description 47
- 238000002955 isolation Methods 0.000 title claims abstract description 14
- 238000005259 measurement Methods 0.000 claims abstract description 26
- 230000001052 transient effect Effects 0.000 claims abstract description 7
- 230000001629 suppression Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 8
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- 239000010937 tungsten Substances 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 3
- 101000668165 Homo sapiens RNA-binding motif, single-stranded-interacting protein 1 Proteins 0.000 description 2
- 102100039692 RNA-binding motif, single-stranded-interacting protein 1 Human genes 0.000 description 2
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 description 1
- 101000668170 Homo sapiens RNA-binding motif, single-stranded-interacting protein 2 Proteins 0.000 description 1
- 102100039690 RNA-binding motif, single-stranded-interacting protein 2 Human genes 0.000 description 1
- 101150105073 SCR1 gene Proteins 0.000 description 1
- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Generation Of Surge Voltage And Current (AREA)
Abstract
The invention discloses a TIG welding power isolation interface circuit, which comprises a high-voltage switch device, wherein the high-voltage switch device consists of a plurality of switch devices which are connected in series, each switch device is connected with a transient voltage suppression device for overvoltage protection in parallel, one side of the high-voltage switch device is provided with a trigger control circuit, and a pulse transformer for isolating is arranged between the high-voltage switch device and the trigger control circuit. The invention adds a controlled on-off isolation circuit between the TIG welding power supply and the arc voltage measurement feedback circuit. When the TIG welding power supply is in an arc starting state, the circuit of the invention reliably isolates the arc voltage measurement feedback circuit from the TIG welding power supply. When the TIG welding power supply is in a successful arc striking state, the circuit of the invention reliably connects the arc voltage measurement feedback circuit with the TIG welding power supply.
Description
Technical Field
The invention relates to a TIG welding power isolation interface circuit, and belongs to the technical field of TIG welding power protection. ( TIG, collectively tungsten inert gas, chinese: tungsten inert gas; TIG welding is tungsten electrode inert gas shielded welding )
Background
In automatic welders employing TIG welding processes, the current value of the feedback arc voltage needs to be measured to achieve Arc Voltage Control (AVC) and other control functions. The TIG welding power source generally adopts a high-frequency high-voltage arc starting mode, namely, when the arc is started, the welding power source outputs 2000-3000V of high-frequency high voltage so as to break down the air gap between the tungsten rod and the workpiece, and an arc is formed. In this case, if the arc voltage measurement feedback circuit is connected, an arc strike failure may be caused, and the arc voltage measurement feedback circuit may be damaged.
Disclosure of Invention
The invention aims to solve the technical problems that: the problems of failure in arc striking and damage to the arc voltage measurement feedback circuit caused by the fact that the arc voltage measurement feedback circuit is connected when the TIG welding power supply adopts high-frequency high-voltage arc starting are solved.
In order to solve the technical problems, the technical scheme of the invention provides a TIG welding power supply isolation interface circuit which is characterized by being arranged between an output end of a TIG welding power supply and an arc voltage measurement feedback circuit, wherein the TIG welding power supply isolation interface circuit comprises a high-voltage switch device, the high-voltage switch device consists of a plurality of switch devices which are connected in series, each switch device is connected with a transient voltage suppression device for overvoltage protection in parallel, one side of the high-voltage switch device is provided with a trigger control circuit, and a pulse transformer for isolating is arranged between the high-voltage switch device and the trigger control circuit.
Preferably, each of said switching devices comprises a high voltage thyristor and a switch connected in series with each other.
Preferably, the trigger control circuit comprises an oscillating circuit, the oscillating circuit is connected with a triode, and the triode is connected with the high-voltage switching device through a pulse transformer.
Preferably, the oscillating circuit is composed of a 555 circuit and a resistor capacitor at the periphery of the 555 circuit; one end ground connection of 555 circuit, no. 2 feet and No. 6 feet on the 555 circuit all are connected with the one end of third resistance and the one end of first electric capacity, the other end of third resistance and the one end of second resistance are connected to No. 7 feet on the 555 circuit, the other end of second resistance and the one end of fourth resistance are connected to No. 8 feet on the 555 circuit, the other end and the control signal end of fourth resistance are connected to No. 4 feet on the 555 circuit, the one end of second electric capacity is connected to No. 5 feet on the 555 circuit, the one end of fifth electric capacity is connected to No. 3 feet on the 555 circuit, the other end of fifth electric capacity is connected with the base of triode, the other end of first electric capacity and the other end of second electric capacity are connected to the projecting pole of triode, pulse transformer is connected to the collecting electrode of triode.
Preferably, the control signal of the control signal end is Uc, when uc=0, the oscillating circuit blocks off vibration, the pin No. 3 outputs low level, the triode is cut off, and the pulse transformer does not trigger pulse output; when uc=1, the oscillating circuit starts to oscillate, pin No. 3 outputs a pulse signal, and a trigger pulse is output to the high-voltage switching device through the triode driving pulse transformer.
Preferably, when the TIG welding power supply is in an arc starting state, the trigger control circuit controls the trigger pulse to enable the high-voltage switching device to be in a cut-off state, and the TIG welding power supply is isolated from the arc voltage measurement feedback circuit; when the arc striking of the TIG welding power supply is successful, the trigger control circuit controls the trigger pulse to enable the high-voltage switch device to be in a conducting state, and the arc voltage of the TIG welding power supply is connected to the arc voltage measurement feedback circuit.
Preferably, the switching devices are divided into two groups, wherein one group of switching devices is connected in series in the positive electrode loop, and the other group of switching devices is connected in series in the negative electrode loop; the output end of the TIG welding power supply isolation interface circuit is connected with a first resistor in parallel.
The invention adds a controlled on-off isolation circuit between the TIG welding power supply and the arc voltage measurement feedback circuit. When the TIG welding power supply is in an arc starting state, the circuit provided by the invention reliably isolates the arc voltage measurement feedback circuit from the TIG welding power supply, so that the arc voltage measurement feedback circuit is prevented from being damaged by high-frequency high voltage, and enough large impedance is provided to ensure that the arc starting is successful. When the TIG welding power supply is in an arc striking successful state, the circuit reliably connects the arc voltage measurement feedback circuit with the TIG welding power supply, and the arc voltage is input into the arc voltage measurement feedback circuit through the circuit.
Drawings
Fig. 1 is a schematic diagram of a TIG welding power isolation interface circuit.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
The invention relates to a TIG welding power supply isolation interface circuit, which is used for isolating or connecting a TIG welding power supply with an arc voltage measurement feedback circuit, as shown in figure 1, the circuit is connected between the output end of the TIG welding power supply and the arc voltage measurement feedback circuit, and when the TIG welding starts an arc and sends out high-frequency high voltage of about 3000V, the circuit isolates the arc voltage measurement feedback circuit from the circuit; when the arc striking is successful, the circuit of the invention connects the arc voltage measurement feedback circuit with the circuit.
The isolation and the connection are realized by adopting high-voltage switching devices such as high-voltage thyristors, and each switching device comprises a high-voltage thyristor and a switch which are connected in series; in order to overcome the defect of insufficient withstand voltage of a single switching device, the high-voltage switching device is formed by connecting 4 switches in series. In order to ensure that the switching device is not broken down by the TIG arcing high voltage, a transient voltage suppression device is adopted on a single switching device for overvoltage protection.
A trigger control circuit is arranged on one side of the high-voltage switching device, and the high-voltage switching device and the trigger control circuit are isolated by adopting a pulse transformer.
The trigger control circuit comprises an oscillating circuit, a trigger pulse circuit is formed by adopting the oscillating circuit, and the trigger pulse circuit is amplified by a triode and then is output to a high-voltage switching device through a pulse transformer so as to control the on-off state of the high-voltage switching device.
The oscillating circuit is composed of a 555 circuit and a resistor capacitor at the periphery of the 555 circuit; one end ground connection of 555 circuit, no. 2 feet and No. 6 feet on the 555 circuit all are connected with the one end of third resistance and the one end of first electric capacity, the other end of third resistance and the one end of second resistance are connected to No. 7 feet on the 555 circuit, the other end of second resistance and the one end of fourth resistance are connected to No. 8 feet on the 555 circuit, the other end and the control signal end of fourth resistance are connected to No. 4 feet on the 555 circuit, the one end of second electric capacity is connected to No. 5 feet on the 555 circuit, the one end of fifth electric capacity is connected to No. 3 feet on the 555 circuit, the other end of fifth electric capacity is connected with the base of triode, the other end of first electric capacity and the other end of second electric capacity are connected to the projecting pole of triode, pulse transformer is connected to the collecting electrode of triode. Wherein, triode V1 is NPN triode. The collector connection of the triode is also connected with a diode.
When the circuit is in an isolated state, the input end of the circuit can bear high-frequency voltage impact of not less than 3000V, has large input impedance, and does not influence the establishment of TIG welding arc. When the circuit is in a conducting state, the circuit has smaller conducting voltage drop and can ensure reliable conduction.
When the TIG welding power supply is in an arc starting state, the trigger control circuit controls the trigger pulse to enable the high-voltage switching device to be in a cut-off state, and the TIG welding power supply is isolated from the arc voltage measurement feedback circuit;
when the arc striking of the TIG welding power supply is successful, the trigger control circuit controls the trigger pulse to enable the high-voltage switching device to be in a conducting state, and the arc voltage of the TIG welding power supply is connected to the arc voltage measurement feedback circuit.
The circuit device is arranged on a printed circuit board, and the input of an original signal and the output of a processing result are connected by adopting an electric terminal board.
The invention is used for isolating and switching on the TIG power supply so as to realize arc voltage measurement and AVC control.
The design scheme principle of the invention is as follows:
1. the first thyristor SCR1 and the second thyristor SCR2 are connected in series in a positive pole loop, and the third thyristor SCR3 and the fourth thyristor SCR4 are connected in series in a negative pole loop, so that the output end of the TIG welding power supply is completely isolated from the arc voltage measurement feedback circuit.
2. When the TIG power supply starts an arc, the high-frequency voltage value reaches 3000V, and the withstand voltage of a general thyristor reaches 2000V at most. In view of the withstand voltage margin, 4 thyristors are employed in series to raise the total withstand voltage value to 8000V.
3. A set of series loops of transient voltage suppressors are connected in parallel on each thyristor. The protection voltage of each transient voltage suppressor is about 500V, and the protection voltage of a protection circuit formed by connecting two transient voltage suppressors in series is 1000V. These overvoltage protection circuits have both voltage protection and voltage equalizing effects.
4. The output end is connected in parallel with a first resistor R1 to provide conduction maintaining current for thyristors SCR1-SCR 4; the resistor R1 is disposed between the thyristors SCR2 and SCR 3.
5. An oscillating circuit is formed by a 555 circuit and a peripheral resistor capacitor, and trigger pulses are provided; the pulse signal is amplified by the triode V1 and then output by the pulse transformers T1 and T2, and the conduction of the thyristors SCR1-SCR4 is controlled. Uc is a control signal, when Uc=0, the oscillating circuit blocks oscillation stop, the 3 rd pin outputs low level, the triode V1 is cut off, and the pulse transformer does not trigger pulse output; when uc=1, the oscillating circuit starts to oscillate, pin No. 3 outputs a pulse signal, and the pulse transformer is driven by triode V1 to output a trigger pulse to thyristors SCR1-SCR4 (i.e. high voltage switching devices).
Claims (1)
1. The TIG welding power supply isolation interface circuit is characterized by being arranged between the output end of a TIG welding power supply and an arc voltage measurement feedback circuit, and comprises a high-voltage switching device, wherein the high-voltage switching device consists of a plurality of switching devices which are mutually connected in series, a transient voltage suppression device for overvoltage protection is connected in parallel on each switching device, a trigger control circuit is arranged on one side of the high-voltage switching device, and a pulse transformer for isolating is arranged between the high-voltage switching device and the trigger control circuit; each switching device comprises a high-voltage thyristor and a switch which are connected in series; the trigger control circuit comprises an oscillating circuit, the oscillating circuit is connected with a triode, and the triode is connected with a high-voltage switching device through a pulse transformer; the oscillating circuit is composed of a 555 circuit and a resistor capacitor at the periphery of the 555 circuit; one end of the 555 circuit is grounded, a pin 2 and a pin 6 on the 555 circuit are connected with one end of a third resistor and one end of a first capacitor, a pin 7 on the 555 circuit is connected with the other end of the third resistor and one end of a second resistor, a pin 8 on the 555 circuit is connected with the other end of the second resistor and one end of a fourth resistor, a pin 4 on the 555 circuit is connected with the other end of the fourth resistor and a control signal end, a pin 5 on the 555 circuit is connected with one end of the second capacitor, a pin 3 on the 555 circuit is connected with one end of a fifth resistor, the other end of the fifth resistor is connected with a base electrode of a triode, an emitter electrode of the triode is connected with the other end of the first capacitor and the other end of the second capacitor, and a collector electrode of the triode is connected with a pulse transformer; the control signal of the control signal end is Uc, when Uc=0, the oscillating circuit locks and stops oscillating, the 3 rd pin outputs low level, the triode is cut off, and the pulse transformer does not trigger pulse output; when uc=1, the oscillating circuit starts to oscillate, pin 3 outputs pulse signals, and the trigger pulse is output to the high-voltage switching device through the triode driving pulse transformer; when the TIG welding power supply is in an arc starting state, the trigger control circuit controls the trigger pulse to enable the high-voltage switching device to be in a cut-off state, and the TIG welding power supply is isolated from the arc voltage measurement feedback circuit; when the arc striking of the TIG welding power supply is successful, the trigger control circuit controls the trigger pulse to enable the high-voltage switching device to be in a conducting state, and the arc voltage of the TIG welding power supply is connected to the arc voltage measurement feedback circuit; the switching devices are divided into two groups, wherein one group of switching devices is connected in series in the positive circuit, and the other group of switching devices is connected in series in the negative circuit; the output end of the TIG welding power supply isolation interface circuit is connected with a first resistor in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810978844.1A CN109079286B (en) | 2018-08-27 | 2018-08-27 | TIG welding power isolation interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810978844.1A CN109079286B (en) | 2018-08-27 | 2018-08-27 | TIG welding power isolation interface circuit |
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| Publication Number | Publication Date |
|---|---|
| CN109079286A CN109079286A (en) | 2018-12-25 |
| CN109079286B true CN109079286B (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810978844.1A Active CN109079286B (en) | 2018-08-27 | 2018-08-27 | TIG welding power isolation interface circuit |
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| Country | Link |
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| CN (1) | CN109079286B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3049133A1 (en) * | 1980-12-24 | 1982-07-15 | Ernst G. 5203 Much Trost | Power supply circuit for electric arc welding appts. - for striking DC arcs, and for striking and stabilising AC arcs |
| SU1542722A1 (en) * | 1988-04-12 | 1990-02-15 | Ленинградское Проектно-Экспериментальное Отделение Всесоюзного Государственного Научно-Исследовательского И Проектного Института "Вниипроектэлектромонтаж" | Invertor welding source |
| CN2232815Y (en) * | 1995-12-05 | 1996-08-14 | 北京新星盛电器有限公司 | Shock-proof device of energy-saving manually-operated a.c arc welder |
| CN1374164A (en) * | 2002-04-22 | 2002-10-16 | 俞岳皋 | Energy-storing multifunctional welding machine |
| CN201201104Y (en) * | 2008-01-28 | 2009-03-04 | 王汝敬 | Safe energy-saving apparatus of electric welder |
| CN203973028U (en) * | 2014-08-18 | 2014-12-03 | 温州霖德电子科技有限公司 | Argon arc welding hand switch signal isolation circuit |
| CN209035669U (en) * | 2018-08-27 | 2019-06-28 | 上海锅炉厂有限公司 | A kind of TIG weld isolated from power interface circuit |
-
2018
- 2018-08-27 CN CN201810978844.1A patent/CN109079286B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3049133A1 (en) * | 1980-12-24 | 1982-07-15 | Ernst G. 5203 Much Trost | Power supply circuit for electric arc welding appts. - for striking DC arcs, and for striking and stabilising AC arcs |
| SU1542722A1 (en) * | 1988-04-12 | 1990-02-15 | Ленинградское Проектно-Экспериментальное Отделение Всесоюзного Государственного Научно-Исследовательского И Проектного Института "Вниипроектэлектромонтаж" | Invertor welding source |
| CN2232815Y (en) * | 1995-12-05 | 1996-08-14 | 北京新星盛电器有限公司 | Shock-proof device of energy-saving manually-operated a.c arc welder |
| CN1374164A (en) * | 2002-04-22 | 2002-10-16 | 俞岳皋 | Energy-storing multifunctional welding machine |
| CN201201104Y (en) * | 2008-01-28 | 2009-03-04 | 王汝敬 | Safe energy-saving apparatus of electric welder |
| CN203973028U (en) * | 2014-08-18 | 2014-12-03 | 温州霖德电子科技有限公司 | Argon arc welding hand switch signal isolation circuit |
| CN209035669U (en) * | 2018-08-27 | 2019-06-28 | 上海锅炉厂有限公司 | A kind of TIG weld isolated from power interface circuit |
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| Publication number | Publication date |
|---|---|
| CN109079286A (en) | 2018-12-25 |
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