CN108015387B - Non-contact arc striking circuit and argon arc welding machine - Google Patents
Non-contact arc striking circuit and argon arc welding machine Download PDFInfo
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- CN108015387B CN108015387B CN201711483741.XA CN201711483741A CN108015387B CN 108015387 B CN108015387 B CN 108015387B CN 201711483741 A CN201711483741 A CN 201711483741A CN 108015387 B CN108015387 B CN 108015387B
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- 238000003466 welding Methods 0.000 title claims abstract description 48
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 229910052786 argon Inorganic materials 0.000 title claims abstract description 20
- 238000010891 electric arc Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 77
- 230000008878 coupling Effects 0.000 claims description 41
- 238000010168 coupling process Methods 0.000 claims description 41
- 238000005859 coupling reaction Methods 0.000 claims description 41
- 238000010586 diagram Methods 0.000 description 12
- 238000012423 maintenance Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- B23K9/06—Arrangements or circuits for starting the arc, e.g. by generating ignition voltage, or for stabilising the arc
- B23K9/067—Starting the arc
- B23K9/0672—Starting the arc without direct contact between electrodes
-
- 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
- B23K9/16—Arc welding or cutting making use of shielding gas
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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 non-contact arc striking circuit and an argon arc welding machine. The non-contact arc striking circuit comprises: the power supply is respectively and electrically connected with a first arc striking input end of the non-contact arc striking circuit, a high voltage input end of the high voltage arc striking circuit and a boosting input end of the boosting circuit; the first high-voltage pulse output end of the high-voltage arc striking circuit is electrically connected with a power supply output end and is used for generating an electric arc according to a first alternating voltage and applying the electric arc to the first arc striking input end and the second arc striking input end; the boost output end of the boost circuit is respectively and electrically connected with the first arc striking input end and the first high-voltage pulse output end and is used for generating a second direct-current voltage according to the first alternating-current voltage and applying the second direct-current voltage to the first arc striking input end and the first high-voltage pulse output end to maintain an electric arc, the value of the second direct-current voltage is larger than that of the first direct-current voltage, the problems that the reliability of the non-contact arc striking circuit is poor and the arc striking success rate is low are solved, and the arc striking success rate and the reliability of the non-contact arc striking circuit are improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of welding power sources, in particular to a non-contact arc striking circuit and an argon arc welding machine.
Background
The welding process plays a very important role in modern industrial civilization, and the appearance of welding meets the need of metal art development on new technological means. Among them, argon arc welding is widely used as a welding method because it has the advantages of a narrow welding heat affected zone, a small weld stress, a small tendency to deform and crack, convenient operation and observation, and weldable refractory metals.
There are two kinds of arc striking modes commonly used in argon arc welding machines, namely contact arc striking and non-contact arc striking. The contact striking arc is lifted up after contacting the workpiece through a tungsten needle on the welding gun. The non-contact arc striking breaks down the gas through high voltage or high voltage pulse, and an electric arc is generated between the tungsten needle and the workpiece, so that the tungsten needle on the welding gun is not required to be contacted with the workpiece. However, the existing non-contact arc striking argon arc welder has the defects of poor reliability and low arc striking success rate, and is also a key control difficulty in the industry all the time.
Disclosure of Invention
The invention provides a non-contact arc striking circuit and an argon arc welding machine, which are used for improving the success rate and reliability of arc striking of the non-contact arc striking circuit.
In a first aspect, an embodiment of the present invention provides a non-contact arc striking circuit, including:
the power supply comprises a plurality of power supply output ends which are respectively and electrically connected with a first arc striking input end of the non-contact arc striking circuit, a high voltage input end of the high voltage arc striking circuit and a boosting input end of the boosting circuit, and are used for outputting a first direct current voltage to the arc striking input end and inputting a first alternating current voltage to the high voltage input end and the boosting input end;
the high-voltage arc striking circuit comprises a first high-voltage pulse output end and a second high-voltage pulse output end, wherein the first high-voltage pulse output end is electrically connected with one power supply output end and is used for generating high-voltage pulses according to the first alternating voltage and applying the high-voltage pulses to the first arc striking input end and the second arc striking input end so as to generate an electric arc;
the voltage boosting circuit comprises a first voltage boosting output end and a second voltage boosting output end, wherein the first voltage boosting output end of the voltage boosting circuit is electrically connected with the first arc striking input end, the second voltage boosting output end of the voltage boosting circuit is electrically connected with the first high-voltage pulse output end, and is used for generating a second direct-current voltage according to the first alternating-current voltage and applying the second direct-current voltage to the first arc striking input end and the first high-voltage pulse output end to maintain the electric arc, and the value of the second direct-current voltage is larger than that of the first direct-current voltage.
Optionally, the value of the second dc voltage is between 1.5 and 2.5 times the value of the first dc voltage.
Optionally, the power supply includes a first power output end, a second power output end and a third power output end, where the first power output end and the second power output end are electrically connected with the first arc striking input end and the second boosting output end respectively;
the boosting circuit includes:
the first end of the first capacitor is electrically connected with the third power supply output end;
the negative electrode of the second capacitor is electrically connected with the second power supply output end, and the positive electrode of the second capacitor is electrically connected with the first power supply output end;
the cathode of the first diode is electrically connected with the second end of the first capacitor, and the anode of the first diode is electrically connected with the second power supply output end;
and the anode of the second diode is electrically connected with the cathode of the first diode, and the cathode of the second diode is electrically connected with the anode of the second capacitor.
Optionally, the boosting circuit further includes: a boost protection sub-circuit; the positive electrode of the second capacitor is electrically connected with the first power supply output end through the boosting protection subcircuit;
the boost protection sub-circuit includes: a third diode, a first resistor and a second resistor; the anode of the third diode is electrically connected with the anode of the second capacitor, the cathode of the third diode is electrically connected with the first end of the second resistor, the second end of the second resistor is electrically connected with the first power output end, the first end of the first resistor is electrically connected with the anode of the third diode, and the second end of the first resistor is electrically connected with the second end of the second resistor.
Optionally, the high voltage arc striking circuit includes:
the line output transformer comprises a first voltage input end, a second voltage input end, a first voltage output end and a second voltage output end, wherein the first voltage input end is electrically connected with the third power output end, and the second voltage input end is electrically connected with the second power output end;
the anode of the fourth diode is electrically connected with the first voltage output end;
a discharger electrically connected between the cathode of the fourth diode and the second voltage output terminal;
a third capacitor, wherein a first end of the third capacitor is electrically connected with the cathode of the fourth diode;
the high-frequency coupler comprises a first coupling input end, a second coupling input end, a first coupling output end and a second coupling output end, wherein the second coupling input end is electrically connected with the second voltage output end, the first coupling input end is electrically connected with the second end of the third capacitor, the first coupling output end is electrically connected with the first power output end, and the second coupling output end is electrically connected with the second power output end.
Optionally, the power supply includes: a main transformer, the secondary of the main transformer including a center tap, a first tap, and a second tap;
the effective value of the alternating voltage output between the first tap and the second tap is twice the effective value of the alternating voltage output between the first tap and the center tap.
Optionally, the first tap is used as the third power supply output terminal, and the second tap is used as the second power supply output terminal;
the non-contact arc striking circuit further includes:
a full-wave rectification circuit including a fifth diode and a sixth diode;
the anode of the fifth diode is electrically connected with the first tap;
the anode of the sixth diode is electrically connected with the second tap, and the cathode of the sixth diode is electrically connected with the cathode of the fifth diode and serves as the first power supply output end.
Optionally, the non-contact arc striking circuit further comprises:
the output protection circuit comprises a piezoresistor, a fourth capacitor and a fifth capacitor; the first end of the piezoresistor and the first end of the fourth capacitor are respectively and electrically connected with the cathode of the sixth diode; the second end of the fourth capacitor and the first end of the fifth capacitor are grounded, and the second end of the piezoresistor and the second end of the fifth capacitor are respectively and electrically connected with the center tap.
In a second aspect, the embodiment of the invention also provides an argon arc welding machine, which comprises a welding gun, a welding ground wire clamp and a machine body;
the machine body comprises the non-contact arc striking circuit provided by any embodiment of the invention;
the input end of the welding gun is electrically connected with the second arc striking input end, and the input end of the welding ground wire clamp is electrically connected with the first arc striking input end and used for generating an electric arc between the output end of the welding gun and the output end of the welding ground wire clamp.
According to the invention, the supercharging circuit is arranged, the supercharging input end of the supercharging circuit is electrically connected with the power output end of the power supply for outputting the first alternating voltage, the first supercharging output end of the supercharging circuit is electrically connected with the first striking input end, the second supercharging output end is electrically connected with the first high-voltage pulse output end, the supercharging circuit is enabled to apply the second direct voltage generated by the supercharging circuit according to the first alternating voltage to the first striking input end and the first high-voltage pulse output end, and the value of the second direct voltage is larger than that of the first direct voltage, so that the voltage of the striking input end is multiplied, the no-load voltage is increased, and the success rate of striking arcs of the high-voltage striking circuit is further improved; meanwhile, the voltage boosting circuit provides continuous and stable voltage, so that an arc generated after the high-voltage arc striking circuit is successful in striking an arc can be maintained, and the welding reliability is improved. Therefore, the invention solves the problems of poor reliability and lower arc striking success rate of the argon arc welder for non-contact arc striking and improves the arc striking success rate and reliability of a non-contact arc striking circuit.
Drawings
Fig. 1 is a schematic structural diagram of a non-contact arc striking circuit according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a non-contact arc striking circuit according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a non-contact arc striking circuit according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a non-contact arc striking circuit according to a fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of a non-contact arc striking circuit according to a fifth embodiment of the present invention;
fig. 6 is a schematic structural diagram of an argon arc welding machine according to a sixth embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Example 1
Fig. 1 is a schematic structural diagram of a non-contact arc striking circuit according to a first embodiment of the present invention. Referring to fig. 1, the non-contact arc striking circuit specifically includes: a power supply 10, a high voltage arc striking circuit 20 and a boost circuit 30.
The power supply 10 comprises a plurality of power supply outputs 100 electrically connected to the first striking input 401 of the non-contact striking circuit, the high voltage input 201 of the high voltage striking circuit 20 and the boost input 301 of the boost circuit 30, respectively. The non-contact arc striking circuit is configured to output a first dc voltage to the first arc striking input terminal 401 and to input a first ac voltage to the high voltage input terminal 201 and the boost input terminal 301.
The high voltage arc striking circuit 20 includes a first high voltage pulse output 202 and a second high voltage pulse output 203, the first high voltage pulse output 202 of the high voltage arc striking circuit 20 being electrically connected to one of the power supply outputs 100 for generating a high voltage pulse based on a first ac voltage and being applied to a first striking input 401 and a second striking input 402 for generating an arc.
The boost circuit 30 includes a first boost output terminal 302 and a second boost output terminal 303, where the first boost output terminal 302 of the boost circuit 30 is electrically connected to the first striking input terminal 401, and the second boost output terminal 303 is electrically connected to the first high voltage pulse output terminal 202, and is configured to generate a second direct current voltage according to the first alternating current voltage, and apply the second direct current voltage to the striking first arc input terminal 401 and the first high voltage pulse output terminal 202, so as to maintain an arc, where the value of the second direct current voltage is greater than the value of the first direct current voltage.
Referring to fig. 1, it can be seen that not only the first dc voltage but also the second dc voltage can be output between the first striking input terminal 401 and the second boosting output terminal 303. The first boost output 302 and the first arc striking input 401 are electrically connected by the power supply 10 such that high voltage pulses generated by the first boost output 302 and the second boost output 303 are applied between the first arc striking input 401 and the second arc striking input 402. The working process of the non-contact arc striking circuit is as follows: in the initial stage of arc generation, the second direct current voltage (i.e. no-load voltage) output between the second boosting output end 303 and the first striking input end 401 of the boosting circuit 30 is higher, so that the striking success rate is improved, the first high-voltage pulse output end 202 and the second high-voltage pulse output end 203 of the high-voltage striking circuit 20 output striking high voltage of 2-10 kV, the striking high voltage is applied to a welding gun and a workpiece respectively connected with the first striking input end 401 and the second striking input end 402, air between the welding gun and the workpiece can be broken down to generate an arc, and the striking is successful; in the first stage of arc maintenance, the second direct current voltage output by the first boost output end 302 and the second boost output end 303 of the boost circuit 30 maintains the arc not to disappear; in the second stage of arc maintenance, i.e. the booster circuit 30 continues to output the second dc voltage for a period of time, after the arc is stabilized, the high voltage striking circuit 20 and the booster circuit 30 may be disconnected, and since the first high voltage pulse output terminal 202 and the second high voltage pulse output terminal 203 of the high voltage striking circuit 20 are electrically connected, the first dc voltage output by the power supply 10 is applied to the first striking input terminal 401 and the second striking input terminal 402, so as to maintain the arc from disappearing.
Studies have shown that the higher the no-load voltage, the higher the success rate of striking the arc, during the initial phase of arc generation, and the lower the voltage required during the arc maintenance phase. In the prior art, low no-load voltage is generally adopted, so that the problem of low success rate of arc striking is caused. The invention sets that a first boost output end 302 of the boost circuit 30 is electrically connected with a first striking input end 401, and a second boost output end 303 is electrically connected with a first high-voltage pulse output end 202, and is used for generating a second direct-current voltage according to a first alternating-current voltage, and applying the second direct-current voltage to the first striking input end 401 and the second striking input end 402 to maintain an electric arc, wherein the value of the second direct-current voltage is larger than that of the first direct-current voltage. The technical scheme provided by the embodiment is that the booster circuit 30 is added in the non-contact arc striking circuit, so that the no-load voltage of the non-contact arc striking circuit in the initial stage of arc generation is improved, and the arc striking success rate is improved; in the maintenance stage of the arc, the first direct current voltage with lower voltage is still adopted, so that the loss of the non-contact arc striking circuit is reduced. Therefore, the invention solves the problems of poor reliability and lower arc striking success rate of the argon arc welder for non-contact arc striking and improves the arc striking success rate and reliability of a non-contact arc striking circuit.
Alternatively, the value of the second direct voltage may be between 1.5 and 2.5 times the value of the first direct voltage. On the one hand, the generation of excessive no-load voltage has higher requirements on the precision and reliability of components, which increases the cost of the components in the circuit. On the other hand, in order to apply the no-load voltage generated by the first striking input terminal 401 and the second striking input terminal 402 to the workpiece, the no-load voltage is often exposed outside the argon arc welding machine, and if the non-contact striking circuit generates an excessively high no-load voltage, the no-load voltage may pose a serious threat to the personal safety of the user. The value of the second direct current voltage is set to be 1.5 to 2.5 times of the value of the first direct current voltage, so that the success rate of arc striking can be improved, and the potential safety hazard can be reduced.
Alternatively, the value of the second direct voltage may be 2 times the value of the first direct voltage.
Alternatively, the first DC voltage may be between 40V and 113V, and the second DC voltage may be between 80V and 226V.
Example two
Fig. 2 is a schematic structural diagram of a non-contact arc striking circuit according to a second embodiment of the present invention. Referring to fig. 2, the non-contact arc striking circuit includes: a power supply 10, a high voltage arc striking circuit 20 and a boost circuit 30.
Further, on the basis of the above embodiment, the power output terminal of the power supply 10 may include a first power output terminal 102, a second power output terminal 104, and a third power output terminal 106, where the first power output terminal 102 and the second power output terminal 104 are electrically connected to the first striking input terminal 401 and the second boosting output terminal, respectively.
At this time, the boosting circuit 30 may specifically include:
the first end of the first capacitor C14 is electrically connected to the third power output end 106;
the negative electrode of the second capacitor C2 is electrically connected with the second power supply output end 104, and the positive electrode of the second capacitor C2 is electrically connected with the first power supply output end 102;
the cathode of the first diode D1 is electrically connected with the second end of the first capacitor C14, and the anode of the first diode D1 is electrically connected with the second power output end 104;
and a second diode D2, wherein the anode of the second diode D2 is electrically connected with the cathode of the first diode D1, and the cathode of the second diode D2 is electrically connected with the anode of the second capacitor C2.
The voltage boost circuit 30 is a voltage doubler rectifier circuit, and when the first ac voltage is positive, the potential of the second power output terminal 104 is higher than the potential of the third power output terminal 106. The first capacitor C14 is charged to the peak value of the first alternating voltage via the first diode D1. When the first ac voltage is negative, the potential of the third power output terminal 106 is higher than the potential of the second power output terminal 104. The first capacitor C14 and the first ac voltage are added and then charged into the second capacitor C2 through the second diode D2, so that the voltage across the second capacitor C2 is about twice the peak value of the first ac voltage. The embodiment solves the problems of poor reliability and low arc striking success rate of the argon arc welder for non-contact arc striking, and improves the arc striking success rate and reliability of a non-contact arc striking circuit.
With continued reference to fig. 2, the boost circuit 30 may further include: a boost protection sub-circuit 31; the positive electrode of the second capacitor C2 is electrically connected to the first power output terminal 102 through the boost protection sub-circuit 31.
The boost protection sub-circuit 31 may include: a third diode D3, a first resistor R1 and a second resistor R2. The positive pole of third diode D3 is connected with the positive pole electricity of second electric capacity C2, and the negative pole of third diode D3 is connected with the first end electricity of second resistance R2, and the second end of second resistance R2 is connected with first power output 102 electricity, and third diode D3 and second resistance R2 set up like this and have played the effect of accelerating the discharge of boost circuit 30. The first end of the first resistor R1 is electrically connected to the anode of the third diode D3, and the second end of the first resistor R1 is electrically connected to the second end of the second resistor R2. The first resistor R1 is arranged to act as a current limiter.
Example III
Fig. 3 is a schematic structural diagram of a non-contact arc striking circuit according to a third embodiment of the present invention. Referring to fig. 3, the non-contact arc striking circuit includes: a power supply 10, a high voltage arc striking circuit 20 and a boost circuit 30.
Further, on the basis of the above embodiments, the high voltage arc striking circuit 20 may specifically include:
the row output transformer T2 comprises a first voltage input end 6, a second voltage input end 7, a first voltage output end 8 and a second voltage output end 9, wherein the first voltage input end 6 is electrically connected with a third power output end 106, and the second voltage input end 7 is electrically connected with a second power output end 104;
the anode of the fourth diode D4 is electrically connected with the first voltage output end 8;
a discharger FD1, the discharger FD1 being electrically connected between the cathode of the fourth diode D4 and the second voltage output 9;
the first end of the third capacitor C3 is electrically connected with the cathode of the fourth diode D4;
the high-frequency coupler 21 includes a first coupling input terminal 211, a second coupling input terminal 213, a first coupling output terminal 212, and a second coupling output terminal 214, the second coupling input terminal 213 is electrically connected to the second voltage output terminal 9, the first coupling input terminal 211 is electrically connected to the second terminal of the third capacitor C3, the first coupling output terminal 212 is electrically connected to the first power output terminal 102, and the second coupling output terminal 214 is electrically connected to the second power output terminal 104.
The high voltage arc striking circuit 20 operates in such a manner that the line output transformer T2 outputs a high voltage direct current, which charges the third capacitor C3 through the winding between the first coupling input 211 and the second coupling input 213 of the high frequency coupler 21, and when the voltage on the third capacitor C3 reaches a certain high voltage (for example, the turning voltage of the discharger FD 1), the discharger FD1 starts to discharge. The third capacitor C3 repeatedly charges and discharges to generate high-voltage resonance, and the first coupling output terminal 212 and the second coupling output terminal 214 of the high-frequency coupler 21 output high voltages required for arc striking.
Alternatively, the high frequency coupler 21 may further include two windings having different turns ratios, and the high frequency high voltage output to the first striking input terminal 401 and the second striking input terminal 402 may be adjusted by adjusting the turns ratios.
Optionally, the high voltage arc striking circuit 20 may further include: and a first end of the third resistor R3 is electrically connected with the second voltage output end 9, and a second end of the third resistor R3 is electrically connected with the discharger FD1 and the second coupling input end 213, so that the current limiting protection function is realized.
Optionally, the high voltage arc striking circuit 20 may further include: the sixth capacitor C4 and the seventh capacitor C5, where the sixth capacitor C4 and the seventh capacitor C5 are connected in parallel with the third capacitor C3, play an effect of enhancing stability of the third capacitor C3 and prolonging life of the third capacitor C3.
Example IV
Fig. 4 is a schematic structural diagram of a non-contact arc striking circuit according to a fourth embodiment of the present invention. Referring to fig. 4, the non-contact arc striking circuit includes: a power supply 10, a high voltage arc striking circuit 20 and a boost circuit 30.
Further, in combination with the second embodiment and the third embodiment, the booster circuit 30 may specifically include:
the first end of the first capacitor C14 is electrically connected to the third power output end 106;
the negative electrode of the second capacitor C2 is electrically connected with the second power supply output end 104, and the positive electrode of the second capacitor C2 is electrically connected with the first power supply output end 102 through a boosting protection subcircuit;
the cathode of the first diode D1 is electrically connected with the second end of the first capacitor C14, and the anode of the first diode D1 is electrically connected with the second power output end 104;
and a second diode D2, wherein the anode of the second diode D2 is electrically connected with the cathode of the first diode D1, and the cathode of the second diode D2 is electrically connected with the anode of the second capacitor C2.
The high voltage arc striking circuit 20 may specifically include:
the row output transformer T2 comprises a first voltage input end 6, a second voltage input end 7, a first voltage output end 8 and a second voltage output end 9, wherein the first voltage input end 6 is electrically connected with a third power output end 106, and the second voltage input end 7 is electrically connected with a second power output end 104;
the anode of the fourth diode D4 is electrically connected with the first voltage output end 8;
a discharger FD1, the discharger FD1 being electrically connected between the cathode of the fourth diode D4 and the second voltage output 9;
the first end of the third capacitor C3 is electrically connected with the cathode of the fourth diode D4;
the high-frequency coupler 21 includes a first coupling input terminal 211, a second coupling input terminal 213, a first coupling output terminal 212, and a second coupling output terminal 214, the second coupling input terminal 213 is electrically connected to the second voltage output terminal 9, the first coupling input terminal 211 is electrically connected to the second terminal of the third capacitor C3, the first coupling output terminal 212 is electrically connected to the first power output terminal 102, and the second coupling output terminal 214 is electrically connected to the second power output terminal 104.
The working processes of the boost circuit 30 and the high voltage arc striking circuit 20 can be referred to the second embodiment and the third embodiment respectively, and the description is omitted.
The boosting circuit in the embodiment consists of a commonly used and cheap diode, a capacitor and a resistor, and has low cost and simple structure; the no-load voltage is increased while the potential safety hazard is avoided, so that the success rate of arc striking of the high-voltage arc striking circuit is improved; meanwhile, the voltage boosting circuit provides continuous and stable voltage, so that an arc generated after the high-voltage arc striking circuit is successful in striking an arc can be maintained, and the welding reliability is improved.
Example five
Fig. 5 is a schematic structural diagram of a non-contact arc striking circuit according to a fifth embodiment of the present invention. Referring to fig. 5, the present embodiment provides a specific non-contact arc striking circuit. The non-contact arc striking circuit comprises: a power supply 10, a high voltage arc striking circuit 20, a booster circuit 30 and an output protection circuit 60.
Further, on the basis of the above embodiments, the power supply 10 may specifically include: a main transformer T1, the secondary of the main transformer T1 including a center tap 4, a first tap 3 and a second tap 5; the effective value of the ac voltage output between the first tap 3 and the second tap 5 is twice the effective value of the ac voltage output between the first tap 3 and the center tap 4.
Optionally, the primary of the main transformer T1 includes a third tap 1 and a fourth tap 2, where the third tap 1 and the fourth tap 2 are electrically connected to an external power supply, respectively, to provide electric energy for the non-contact arc striking circuit.
With continued reference to fig. 5, further, on the basis of the above embodiments, the first tap 3 may be used as the third power output 106, and the second tap 5 may be used as the second power output 104.
The non-contact arc striking circuit may further include:
a full-wave rectifying circuit 11 including fifth diodes D1-3 and sixth diodes D4-6;
the anode of the fifth diode D1-3 is electrically connected with the first tap 3;
the anode of the sixth diode D4-6 is electrically connected to the second tap 5, and the cathode of the sixth diode D4-6 is electrically connected to the cathode of the fifth diode D1-3 and serves as a first power output terminal.
The full-wave rectifying circuit 11 operates on the principle that the potential of the second tap 5 is higher than the potential of the center tap 4 when the first ac voltage is positive half cycle. The supply voltage is output to the first arcing input 401 via a sixth diode D4-6. When the first ac voltage is negative half a cycle, the potential of the first tap 3 is higher than the potential of the center tap 4. The supply voltage is output to the first arcing input 401 via the fifth diode D1-3. The waveform before and after rectification of the full-wave rectification circuit 11 is different from the half-wave rectification, and the voltage output to the first striking input terminal 401 is always the same direction regardless of whether the main transformer T1 outputs the positive half-cycle voltage or the negative half-cycle voltage. The two half waves of the alternating voltage are utilized, the efficiency of the rectifier is improved, and the output voltage is smoother.
Optionally, the full-wave rectifying circuit 11 may further include a fourth resistor R4 and a seventh capacitor C7, where a first end of the fourth resistor R4 is electrically connected to the anode of the fifth diode D1-3, a second end of the fourth resistor R4 is electrically connected to the first end of the seventh capacitor C7, and a second end of the seventh capacitor C7 is electrically connected to the cathode of the fifth diode D1-3, so as to filter the rectified voltage. Similarly, the full-wave rectifying circuit 11 may further include a fifth resistor R5 and an eighth capacitor C8, wherein a first end of the fifth resistor R5 is electrically connected to the anode of the sixth diode D4-6, a second end of the fifth resistor R5 is electrically connected to the first end of the eighth capacitor C8, and a second end of the eighth capacitor C8 is electrically connected to the cathode of the sixth diode D4-6. This arrangement serves to protect the fifth diode D1-3 and the sixth diode D4-6 from damage.
On the basis of the above technical solutions, the non-contact arc striking circuit may further include: the output protection circuit 60 includes a varistor RV1, a fourth capacitor C6 and a fifth capacitor C1; the first end of the piezoresistor RV1 and the first end of the fourth capacitor C6 are respectively and electrically connected with the cathode of the sixth diode D4-6; the second end of the fourth capacitor C6 and the first end of the fifth capacitor C1 are grounded, and the second end of the varistor RV1 and the second end of the fifth capacitor C1 are electrically connected to the center tap 4, respectively. The output protection circuit 60 is arranged in the non-contact arc striking circuit to form a loop of the high-voltage arc striking circuit, and meanwhile, a bypass high-voltage signal is also played, namely, high-frequency high voltage generated by the high-voltage arc striking circuit cannot flow back into the full-wave rectifying circuit 11, so that a protection effect is played.
In this embodiment, the third tap 1 and the fourth tap 2 of the main transformer T1 in the power supply 10 are electrically connected with an external power supply, respectively, to provide electric energy for the non-contact arc striking circuit. The cathode of the sixth diode D4-6 in the power supply 10 is electrically connected to the first striking input terminal 401, the center tap 4 of the main transformer T1 is electrically connected to the second striking input terminal 402, and a first dc voltage is output between the first striking input terminal 401 and the second striking input terminal 402.
The first voltage input end 6 of the line output transformer T2 in the high-voltage arc striking circuit 20 is electrically connected with the center tap 4 of the main transformer T1, and the second voltage input end 7 is electrically connected with the first tap 3 of the main transformer T1 to provide electric energy for generating electric arc by the high-voltage arc striking circuit 20. The first coupling-out terminal 212 and the second coupling-out terminal 214 of the high-frequency coupler 21 are electrically connected to a first striking input terminal 401 and a second striking input terminal 402, respectively, and an arc is generated between the first striking input terminal 401 and the second striking input terminal 402.
The first end of the first capacitor C14 in the boost circuit 30 is electrically connected with the first tap 3 of the main transformer T1 in the power supply 10, the positive electrode of the second capacitor C2 is electrically connected with the first striking input end 401, the negative electrode of the second capacitor C2 is electrically connected with the first coupling output end 212, and a second direct current voltage is output between the first striking input end 401 and the first coupling output end 212, the value of the second direct current voltage is larger than that of the first direct current voltage, so that the striking success rate of the initial stage of arc generation is improved.
Optionally, the first tap 3 of the main transformer T1 is electrically connected to the boost input of the boost circuit 30 and the high voltage input of the high voltage arc striking circuit 20 via the inductor L1, respectively.
The first end and the second end of the varistor RV1 in the output protection circuit 60 are electrically connected to the first striking input 401 and the first coupling output 212, respectively. The output protection circuit 60 forms a loop of the high voltage arc striking circuit 20, and simultaneously prevents high voltage between the first arc striking input end 401 and the first coupling output end 212 from flowing back into the power supply 10, burning out components of the power supply 10, and playing a role in protecting the power supply 10.
Example six
Fig. 6 is a schematic structural diagram of an argon arc welding machine according to a sixth embodiment of the present invention. Referring to fig. 6, the argon arc welding machine comprises a welding gun 920, a welding ground wire clamp 930 and a machine body 901 on the basis of the above embodiments; the body 901 includes a non-contact arc striking circuit provided by any of the embodiments of the present invention. Wherein an input of the welding gun 920 is electrically connected to the second arc striking input 402, and an input of the welding ground clamp 930 is electrically connected to the first arc striking input 401 to generate an arc between an output of the welding gun 920 and an output of the welding ground clamp 930.
When the argon arc welding machine is operated, the output end of the welding ground wire clamp 930 clamps a workpiece, and at the moment, high voltage exists between the output end of the welding gun 920 and the workpiece due to the action of the high-voltage arc striking circuit, and air between the welding gun 920 and the workpiece breaks down due to the high voltage, so that an electric arc is generated, and the workpiece is welded; the arc can be maintained under the action of the second direct current voltage generated by the booster circuit, then the high-voltage arc striking circuit and the booster circuit are disconnected, and the arc is continuously maintained under the action of the first direct current voltage generated by the power supply, so that the effect of stably and reliably welding workpieces is realized.
The argon arc welding machine provided in this embodiment is provided with a first boost output end of the boost circuit electrically connected to the first striking input end 401, and a second boost output end electrically connected to the first high-voltage pulse output end 202, and configured to generate a second direct-current voltage according to the first alternating-current voltage, and apply the second direct-current voltage to the first striking input end 401 and the second striking input end 402, so as to maintain an arc, where a value of the second direct-current voltage is greater than a value of the first direct-current voltage. The technical scheme provided by the embodiment is that a booster circuit is added in a non-contact arc striking circuit, so that the no-load voltage of the non-contact arc striking circuit in the initial stage of arc generation is improved, and the success rate of arc striking is improved; in the maintenance stage of the arc, the first direct current voltage with lower voltage is still adopted, so that the loss of the non-contact arc striking circuit is reduced. Therefore, the invention solves the problems of poor reliability and lower arc striking success rate of the argon arc welder for non-contact arc striking and improves the arc striking success rate and reliability of a non-contact arc striking circuit.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. A non-contact arc striking circuit, comprising:
the power supply comprises a plurality of power supply output ends which are respectively and electrically connected with a first arc striking input end of the non-contact arc striking circuit, a high voltage input end of the high voltage arc striking circuit and a boosting input end of the boosting circuit, and are used for outputting a first direct current voltage to the first arc striking input end and inputting a first alternating current voltage to the high voltage input end and the boosting input end;
the high-voltage arc striking circuit comprises a first high-voltage pulse output end and a second high-voltage pulse output end, wherein the first high-voltage pulse output end is electrically connected with one power supply output end and is used for generating high-voltage pulses according to the first alternating voltage and applying the high-voltage pulses to the first arc striking input end and the second arc striking input end so as to generate an electric arc;
the boost circuit comprises a first boost output end and a second boost output end, the first boost output end of the boost circuit is electrically connected with the first striking input end, the second boost output end is electrically connected with the first high-voltage pulse output end, and is used for generating a second direct-current voltage according to the first alternating-current voltage and applying the second direct-current voltage to the first striking input end and the first high-voltage pulse output end to maintain the electric arc, and the value of the second direct-current voltage is larger than that of the first direct-current voltage;
the first direct current voltage value is between 40 and 113V, and the second direct current voltage value is between 80 and 226V.
2. The non-contact arc striking circuit of claim 1 wherein the value of the second dc voltage is between 1.5 and 2.5 times the value of the first dc voltage.
3. The non-contact arc striking circuit of claim 1 wherein the power supply comprises a first power supply output, a second power supply output, and a third power supply output, the first power supply output and the second power supply output being electrically connected to the first arc striking input and the second boost output, respectively;
the boosting circuit includes:
the first end of the first capacitor is electrically connected with the third power supply output end;
the negative electrode of the second capacitor is electrically connected with the second power supply output end, and the positive electrode of the second capacitor is electrically connected with the first power supply output end;
the cathode of the first diode is electrically connected with the second end of the first capacitor, and the anode of the first diode is electrically connected with the second power supply output end;
and the anode of the second diode is electrically connected with the cathode of the first diode, and the cathode of the second diode is electrically connected with the anode of the second capacitor.
4. The non-contact arc striking circuit of claim 3 wherein the boost circuit further comprises: a boost protection sub-circuit; the positive electrode of the second capacitor is electrically connected with the first power supply output end through the boosting protection subcircuit;
the boost protection sub-circuit includes: a third diode, a first resistor and a second resistor; the anode of the third diode is electrically connected with the anode of the second capacitor, the cathode of the third diode is electrically connected with the first end of the second resistor, the second end of the second resistor is electrically connected with the first power output end, the first end of the first resistor is electrically connected with the anode of the third diode, and the second end of the first resistor is electrically connected with the second end of the second resistor.
5. The non-contact arcing circuit of claim 3, wherein the high voltage arcing circuit comprises:
the line output transformer comprises a first voltage input end, a second voltage input end, a first voltage output end and a second voltage output end, wherein the first voltage input end is electrically connected with the third power output end, and the second voltage input end is electrically connected with the second power output end;
the anode of the fourth diode is electrically connected with the first voltage output end;
a discharger electrically connected between the cathode of the fourth diode and the second voltage output terminal;
a third capacitor, wherein a first end of the third capacitor is electrically connected with the cathode of the fourth diode;
the high-frequency coupler comprises a first coupling input end, a second coupling input end, a first coupling output end and a second coupling output end, wherein the second coupling input end is electrically connected with the second voltage output end, the first coupling input end is electrically connected with the second end of the third capacitor, the first coupling output end is electrically connected with the first power output end, and the second coupling output end is electrically connected with the second power output end.
6. A non-contact arc striking circuit according to claim 3, wherein the power supply comprises: a main transformer, the secondary of the main transformer including a center tap, a first tap, and a second tap;
the effective value of the alternating voltage output between the first tap and the second tap is twice the effective value of the alternating voltage output between the first tap and the center tap.
7. The non-contact arc starting circuit of claim 6 wherein the first tap is the third power supply output and the second tap is the second power supply output;
the non-contact arc striking circuit further includes:
a full-wave rectification circuit including a fifth diode and a sixth diode;
the anode of the fifth diode is electrically connected with the first tap;
the anode of the sixth diode is electrically connected with the second tap, and the cathode of the sixth diode is electrically connected with the cathode of the fifth diode and serves as the first power supply output end.
8. The non-contact arc striking circuit of claim 7 further comprising:
the output protection circuit comprises a piezoresistor, a fourth capacitor and a fifth capacitor; the first end of the piezoresistor and the first end of the fourth capacitor are respectively and electrically connected with the cathode of the sixth diode; the second end of the fourth capacitor and the first end of the fifth capacitor are grounded, and the second end of the piezoresistor and the second end of the fifth capacitor are respectively and electrically connected with the center tap.
9. An argon arc welding machine is characterized by comprising a welding gun, a welding ground wire clamp and a machine body;
the fuselage comprising the non-contact arcing circuit of any of claims 1-8;
the input end of the welding gun is electrically connected with the second arc striking input end, and the input end of the welding ground wire clamp is electrically connected with the first arc striking input end so as to generate an electric arc between the output end of the welding gun and the output end of the welding ground wire clamp.
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| CN201711483741.XA CN108015387B (en) | 2017-12-29 | 2017-12-29 | Non-contact arc striking circuit and argon arc welding machine |
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| CN201711483741.XA CN108015387B (en) | 2017-12-29 | 2017-12-29 | Non-contact arc striking circuit and argon arc welding machine |
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| CN114050733B (en) * | 2021-11-19 | 2022-05-20 | 杭州凯尔达电焊机有限公司 | Lifting arc striking anti-sticking welding control circuit and welding power supply |
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