CN211072169U - Arc energy compensation circuit and welding machine - Google Patents
Arc energy compensation circuit and welding machine Download PDFInfo
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- CN211072169U CN211072169U CN201921850700.4U CN201921850700U CN211072169U CN 211072169 U CN211072169 U CN 211072169U CN 201921850700 U CN201921850700 U CN 201921850700U CN 211072169 U CN211072169 U CN 211072169U
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Abstract
The application is suitable for the technical field of welding equipment, and provides an arc energy compensation circuit and a welding machine, wherein the arc energy compensation circuit comprises a voltage doubling unit, an energy storage unit and a control unit; the first input end of the voltage doubling unit is connected with the second output end of the intermediate frequency transformer, and the second input end of the voltage doubling unit is connected with the third output end of the intermediate frequency transformer; the first input end of the energy storage unit is connected with the first output end of the voltage doubling unit, the second input end of the energy storage unit is connected with the second output end of the voltage doubling unit, and the output end of the energy storage unit is connected with the output port; the input end of the control unit is connected with a main controller used for generating a compensation signal, and the output end of the control unit is connected with the signal input end of the energy storage unit; the voltage doubling unit boosts a voltage signal output by the intermediate frequency transformer, and the energy storage unit stores energy based on the voltage signal output by the voltage doubling unit; the control unit controls the energy storage unit to release energy to the output port according to the compensation signal. The problem of the welding machine low current welding arc starting difficulty among the prior art is solved.
Description
Technical Field
The utility model belongs to the technical field of welding equipment, especially, relate to an electric arc energy compensating circuit and welding machine.
Background
The working principle of the inverter welding machine is as follows: the alternating voltage of the commercial power is rectified by the rectifying module, stored by the capacitor filter and converted into high-voltage direct current, the direct current is converted into high-frequency alternating square wave by the inverter unit, and the alternating square wave is rectified by the diode and filtered by the inductor after being reduced by the main transformer, and the low-voltage high-current direct current is output by the output port.
In order to make the output current consistent with the set current stably, the inverter welding machine is additionally provided with current negative feedback PID (proportional Integral derivative) regulation control, after the output current is set by a potentiometer, the current is a dynamically regulated output process because the arc load is not fixed in the welding process, and when the actual output current is smaller than the set current of the panel, a PID regulating circuit regulates a PWM (Pulse Width Modulation) wave to increase the output so as to enlarge the output current. When the actual output current is larger than the set current, the PID regulating circuit narrows the PWM wave, and the output is reduced so that the output current is reduced.
In a welding machine with Insulated Gate Bipolar Transistor (IGBT) as a power element, a main transformer of the welding machine cannot bear an excessively fast adjusting speed, and the excessively fast adjusting speed can cause occurrence of magnetic biasing, so that the main transformer fails, so that the current fluctuation cannot be reduced by using the excessively fast adjusting speed, and the problems of difficult arc striking and unstable welding process of the welding machine in low current welding can be solved.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides an arc energy compensation circuit and a welding machine, so as to solve the problem of arc striking difficulty in low current welding of the welding machine in the prior art.
The application is realized by the following technical scheme:
in a first aspect, an embodiment of the present application provides an arc energy compensation circuit, which includes a voltage doubling unit, an energy storage unit, and a control unit;
the first input end of the voltage doubling unit is connected with the second output end of the intermediate frequency transformer, and the second input end of the voltage doubling unit is connected with the third output end of the intermediate frequency transformer; the first input end of the energy storage unit is connected with the first output end of the voltage doubling unit, the second input end of the energy storage unit is connected with the second output end of the voltage doubling unit, and the output end of the energy storage unit is connected with the output port; the input end of the control unit is connected with a main controller used for generating a compensation signal, and the output end of the control unit is connected with the signal input end of the energy storage unit;
the voltage doubling unit boosts a voltage signal output by the intermediate frequency transformer, and the energy storage unit stores energy based on the voltage signal output by the voltage doubling unit; and the control unit controls the energy storage unit to release energy to the output port according to the compensation signal.
In one possible implementation manner of the first aspect, the voltage doubling unit includes a first diode, a second diode, a third diode, and a first capacitor;
one end of the first capacitor is connected with the anode of the first diode and the cathode of the second diode respectively, the other end of the first capacitor is connected with the third output end of the intermediate frequency transformer, the anode of the second diode is connected with the first input end of the energy storage unit and the cathode of the third diode respectively, the anode of the third diode is connected with the second output end of the intermediate frequency transformer, and the cathode of the first diode is connected with the second input end of the energy storage unit.
In one possible implementation manner of the first aspect, the voltage doubling unit further includes a first inductor and a first resistor;
the first inductor is connected in series between the first capacitor and the third output end of the intermediate frequency transformer, and the first resistor is connected in series between the second diode and the third diode.
In a possible implementation manner of the first aspect, the energy storage unit includes a second capacitor and a switching tube;
one end of the second capacitor is connected with the second output end of the voltage doubling unit and the drain electrode of the switch tube respectively, the other end of the second capacitor is connected with the first output end of the voltage doubling unit, the source electrode of the switch tube is connected with the output port, and the base electrode of the switch tube is connected with the output end of the control unit.
In a possible implementation manner of the first aspect, the switch transistor is a depletion type MOS transistor or a JFET transistor.
In a possible implementation manner of the first aspect, the control unit includes an optical coupler, a second resistor, a fourth resistor, and a third capacitor;
the first input end of the optical coupler is connected with the main controller, the second input end of the optical coupler is grounded, the first power end of the optical coupler is connected with the power supply, the output end of the optical coupler is connected with one end of the second resistor, the second power end of the optical coupler is respectively connected with the output end of the energy storage unit, one end of the fourth resistor and one end of the third capacitor, and the other end of the second resistor is respectively connected with the other end of the fourth resistor, the other end of the third capacitor and the signal input end of the energy storage unit.
In one possible implementation manner of the first aspect, the control unit further includes a third resistor and a fourth diode;
one end of the third resistor is connected with the common end of the second resistor and the third capacitor, the other end of the third resistor is connected with the anode of the fourth diode, and the cathode of the fourth diode is connected with the common end of the second resistor and the optocoupler.
In one possible implementation manner of the first aspect, the arc energy compensation circuit further includes a clamping unit;
the first end of the clamping unit is connected with the second input end of the voltage doubling unit, the second end of the clamping unit is connected with the first input end of the voltage doubling unit, the third end of the clamping unit is connected with the first output end of the intermediate frequency transformer, and the clamping unit is used for stabilizing the voltage in the circuit.
In a possible implementation manner of the first aspect, the clamping unit includes a first bidirectional zener diode and a second bidirectional zener diode, the first bidirectional zener diode is connected in series between the first input terminal and the second input terminal of the voltage doubling unit, and the second bidirectional zener diode is connected in series between the first input terminal of the voltage doubling unit and the first output terminal of the intermediate frequency transformer.
In a second aspect, embodiments of the present application provide a welder including an arc energy compensation circuit as described above.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the voltage doubling unit boosts a voltage signal output by the intermediate frequency transformer, the energy storage unit stores energy in the voltage signal output by the voltage doubling unit, and the control unit controls the energy storage unit to release energy according to a compensation signal sent by the main controller to play a role in energy compensation during low-current arc starting or low-current welding of the welding machine, so that the success rate of arc starting is improved, and the stability during low-current welding is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a block diagram of an arc energy compensation circuit according to an embodiment of the present invention;
fig. 2 is an exemplary circuit diagram of a voltage doubling unit provided by an embodiment of the present invention;
fig. 3 is an exemplary circuit diagram of an energy storage unit provided by an embodiment of the present invention;
fig. 4 is an exemplary circuit diagram of a control unit provided by an embodiment of the present invention;
fig. 5 is an exemplary circuit diagram of an arc energy compensation circuit according to an embodiment of the present invention.
In the figure: 10. an intermediate frequency transformer; 20. a voltage doubling unit; 30. an energy storage unit; 40. an output port; 50. a control unit; 60. a main controller; 70. a clamping unit.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical solution of the present invention, the following description is made by using specific examples.
As shown in fig. 1, a block schematic diagram of an arc energy compensation circuit provided in an embodiment of the present application may include a voltage doubling unit 20, an energy storage unit 30, and a control unit 50.
A first input end of the voltage doubling unit 20 is connected to the second output end of the intermediate frequency transformer 10, a second input end of the voltage doubling unit 20 is connected to the third output end of the intermediate frequency transformer 10, and the voltage doubling unit 20 boosts the voltage signal output by the intermediate frequency transformer 10 to reach a set voltage.
The first input end of the energy storage unit 30 is connected to the first output end of the voltage doubling unit 20, the second input end of the energy storage unit 30 is connected to the second output end of the voltage doubling unit 20, the output end of the energy storage unit 30 is connected to the output port 40, the energy storage unit 30 stores energy for the voltage signal output by the voltage doubling unit 20, the voltage of the energy stored in the energy storage unit 30 is equal to the voltage output by the voltage doubling unit 20, that is, the voltage of the energy stored in the energy storage unit 30 is the set voltage.
The output port 40 in the embodiment of the present application may be a physical port or a virtual port, the output port 40 refers to a welding device in a welding machine, such as a handle clamp and a wire feeder clamp, and the energy released by the energy storage unit 30 provides energy compensation for welding.
The input end of the control unit 50 is connected to the main controller 60 for generating the compensation signal, the output end of the control unit 50 is connected to the signal input end of the energy storage unit 30, and the control unit 50 controls the energy storage unit 30 to release energy to the output port 40 according to the compensation signal.
In the arc energy compensation circuit, the main controller 60 obtains the voltage feedback signal output by the voltage feedback circuit in the welding machine, and determines the time when the energy compensation is required according to the voltage feedback signal, when the main controller 60 determines that the energy compensation is required for the welding machine, the main controller sends the compensation signal to the control unit 50, and the control unit 50 controls the energy storage unit 30 to release the stored energy to the output port 40 according to the compensation signal, so as to perform the energy compensation for the output of the main loop of the welding machine. Because the energy released by the energy storage unit 30 is boosted by the voltage doubling unit 20, the energy released by the energy storage unit 30 is high-voltage energy, the generation of arcing current can be accelerated, and the success rate of arcing is improved; meanwhile, the welder can improve the stability of the welding process through energy compensation in the small-current welding process.
It should be noted that, the boosting multiple of the voltage doubling unit 20 for boosting the voltage signal output by the intermediate frequency transformer 10 may be designed accordingly as required, and the present application takes the voltage doubling as an example for illustration, but the voltage doubling unit 20 is not limited to the voltage doubling in the actual design.
As shown in fig. 2, which is an example circuit diagram of the voltage doubling unit 20, the voltage doubling unit 20 may include a first diode D1, a second diode D2, a third diode D3, and a first capacitor C1. One end of the first capacitor C1 is connected to the anode of the first diode D1 and the cathode of the second diode D2, respectively, the other end of the first capacitor C1 is connected to the third output terminal of the if transformer 10, the anode of the second diode D2 is connected to the first input terminal of the energy storage unit 30 and the cathode of the third diode D3, the anode of the third diode D3 is connected to the second output terminal of the if transformer 10, and the cathode of the first diode D1 is connected to the second input terminal of the energy storage unit 30.
Illustratively, the output voltage of the if transformer 10 is U, when the second output terminal of the if transformer 10 is positive and the third output terminal is negative, the current charges the first capacitor C1 through the third diode D3 and the second diode D2, and when the first capacitor C1 completes charging, the voltage across the first capacitor C1 is equal to the output voltage U of the if transformer 10. When the second output end of the intermediate frequency transformer 10 is negative and the third output end is positive, the first capacitor C1 discharges, the discharge voltage is U, the first capacitor C1 is connected in series with the intermediate frequency transformer 10, and the voltage between the first output end and the second output end of the voltage doubling unit 20 is 2U, so as to complete voltage boosting and provide high-voltage energy for the energy storage unit 30.
In one embodiment, the voltage doubling unit 20 may further include a first inductor L1 and a first resistor R1. the first inductor L1 is connected in series between the first capacitor C1 and the third output terminal of the intermediate frequency transformer 10, and the first resistor R1 is connected in series between the second diode D2 and the third diode D3.
For example, the first inductor L1 of the first capacitor C1 may slow down the energy release speed during the energy release process, reduce the current spike of the first capacitor C1 during the charging process, and enhance the stability of the circuit, and the first resistor R1 may limit the current from being too large, so as to effectively prevent the components in the voltage doubling unit 20 from being damaged due to the current from being too large.
As shown in fig. 3, in an exemplary circuit diagram of the energy storage unit 30, the energy storage unit 30 includes a second capacitor C2 and a switching tube VT1, one end of the second capacitor C2 is connected to the second output terminal of the voltage doubling unit 20 and the drain of the switching tube VT1, the other end of the second capacitor C2 is connected to the first output terminal of the voltage doubling unit 20, the source of the switching tube VT1 is connected to the output port 40, and the base of the switching tube VT1 is connected to the output terminal of the control unit 50.
When the voltage-doubling signal in the voltage-doubling unit 20 is generated, the second capacitor C2 is charged, and after the charging is completed, the voltage across the second capacitor C2 is the voltage of the output signal of the voltage-doubling unit 20. When the welder needs to perform energy compensation, the control unit 50 receives the compensation signal, generates a level signal and transmits the level signal to the base of the switching tube VT1, controls the conduction of the drain and the source of the switching tube VT1, and the second capacitor C2 releases high-voltage energy to the output port 40. The second capacitor C2 releases high-voltage energy to the output port 40, so that the generation of arcing current is accelerated, and the success rate of arcing is improved; meanwhile, the welder can improve the stability of the welding process through energy compensation in the small-current welding process.
In one embodiment, the switching transistor VT1 may be a depletion MOS transistor or a JFET transistor. The MOS switch tube is used in the circuit provided by the embodiment, and has the characteristic of low on-resistance compared with a diode, so that the temperature rise can be effectively reduced in a specific application circuit.
As shown in fig. 4, which is an example circuit diagram of the control unit 50, the control unit 50 may include an optical coupler U2, a second resistor R2, a fourth resistor R4, and a third capacitor C3. A first input end of the optical coupler U2 is connected with the main controller 60, a second input end of the optical coupler U2 is grounded, a first power end of the optical coupler U2 is connected with a power supply, an output end of the optical coupler U2 is connected with one end of a second resistor R2, and a second power end of the optical coupler U2 is respectively connected with an output end of the energy storage unit 30, one end of a fourth resistor R4 and one end of a third capacitor C3; the other end of the second resistor R2 is connected to the other end of the fourth resistor R4, the other end of the third capacitor C3, and the signal input end of the energy storage unit 30.
For example, when the welder needs energy compensation, the main controller 60 generates a compensation signal and transmits the compensation signal to a first output end of the optical coupler U2, and an output end of the optical coupler U2 outputs a high level after receiving the compensation signal, so as to drive the energy storage unit 30 to release energy, thereby performing energy compensation. When the welder does not need to perform energy compensation, the output end of the optical coupler U2 outputs low level, and the energy storage unit 30 stops energy release.
By way of example and not limitation, when performing energy compensation, the main controller 60 determines the amount of energy to be compensated, and the output compensation signal may be a PWM signal, that is, the amount of compensation energy may be controlled by adjusting the pulse width of the PWM signal.
In this embodiment, the second resistor R2 is a driving resistor, which can increase the driving current, so as to smoothly drive the energy storage unit 30 to operate; the third capacitor C3 can reduce the rising waveform during driving, thereby acting as a buffer.
In one embodiment, the control unit 50 may further include a third resistor R3 and a fourth diode D4. One end of the third resistor R3 is connected with the common end of the second resistor R2 and the third capacitor C3, the other end of the third resistor R3 is connected with the anode of the fourth diode D4, and the cathode of the fourth diode D4 is connected with the common end of the second resistor R2 and the optocoupler U2.
Specifically, the control unit 50 performs switching control on the switching tube VT1 in the energy storage unit 30, and when the switching tube VT1 performs switching control, the third capacitor C3 is charged; when the switching tube VT1 is turned off, in order to increase the turn-off speed of the switching tube VT1, the energy stored in the third capacitor C3 needs to be consumed as soon as possible, and at this time, the third resistor R3 and the fourth diode D4 form a loop, so that the energy stored in the third capacitor C3 can be consumed more quickly.
In addition, in order to avoid mutual interference of two ends of the optical coupler U2, two ends of the optical coupler U2 are not mutually shared.
Referring to fig. 5, in one embodiment, the arc energy compensation circuit may further include a clamping unit 70, a first terminal of the clamping unit 70 is connected to the second input terminal of the voltage doubling unit 20, a second terminal of the clamping unit 70 is connected to the first input terminal of the voltage doubling unit 20, and a third terminal of the clamping unit 70 is connected to the first output terminal of the intermediate frequency transformer 10.
Specifically, the clamping unit 70 plays a role in stabilizing voltage, and when instantaneous high voltage is generated in the circuit, the clamping unit 70 stabilizes the voltage in the circuit within a controllable range, so that the situation that components in the circuit are damaged by the instantaneous high voltage is prevented, and the stability of the circuit is enhanced.
As one possible implementation, referring to fig. 5, the clamping unit 70 may include a first bidirectional zener diode Z1 and a second bidirectional zener diode Z2. Wherein, the first bidirectional zener diode Z1 is connected in series between the first input terminal and the second input terminal of the voltage doubling unit 20, and the second bidirectional zener diode Z2 is connected in series between the first input terminal of the voltage doubling unit 20 and the first output terminal of the intermediate frequency transformer 10.
The above is only one circuit structure of the clamping unit 70, and the embodiment of the present application is not limited thereto, and those skilled in the art can replace the circuit structure of the clamping unit 70 with another circuit structure in the function of the clamping unit 70 in the embodiment of the present application, and all that is considered to be within the scope of the claims of the present application.
As shown in fig. 5, which is an exemplary circuit diagram of an arc energy compensation circuit according to the present application, an output voltage of the intermediate frequency transformer 10 is U, a voltage doubling unit 20 outputs a boosted output voltage of the intermediate frequency transformer 10 of 2U, a second capacitor C2 in the energy storage unit 30 stores energy based on the voltage output by the voltage doubling unit 20, and a voltage across a second capacitor C2 is 2U after the energy storage is completed. When the butt welder needs to be compensated, the main controller 60 generates a compensation signal and sends the compensation signal to the optical coupler U2, the optical coupler U2 is conducted after receiving the compensation signal, the output end of the optical coupler U2 outputs a high level to the base of the switching tube VT1, so that the drain and the source of the switching tube VT1 are conducted, and then the second capacitor C2 releases energy to the output port 40. In this embodiment, the voltage of the energy released by the second capacitor C2 is a higher voltage of 2U, so that the generation of arcing current can be accelerated, and the success rate of arcing is improved; meanwhile, the welder can improve the stability of the welding process through energy compensation in the small-current welding process.
The arc energy compensation circuit improves the dynamic response speed of the output current of the welding machine, so that the IGBT welding machine achieves the welding effect of an expensive MOS tube welding machine on the premise of not changing a welding main power device and the working frequency of the welding main power device, and has the advantages of stable small-current welding process, good small-current arc striking effect, low cost and the like.
Based on the arc energy compensation circuit, the embodiment of the application also discloses a welding machine, which comprises any one of the arc energy compensation circuits except the components of the traditional welding machine. When the welding machine performs low-current welding, the electric arc energy compensation circuit can perform energy compensation to provide high-voltage energy, accelerate the generation of arcing current, improve the success rate of arcing, and improve the stability of the welding process through energy compensation.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. An arc energy compensation circuit is characterized by comprising a voltage doubling unit, an energy storage unit and a control unit;
the first input end of the voltage doubling unit is connected with the second output end of the intermediate frequency transformer, and the second input end of the voltage doubling unit is connected with the third output end of the intermediate frequency transformer; the first input end of the energy storage unit is connected with the first output end of the voltage doubling unit, the second input end of the energy storage unit is connected with the second output end of the voltage doubling unit, and the output end of the energy storage unit is connected with the output port; the input end of the control unit is connected with a main controller used for generating a compensation signal, and the output end of the control unit is connected with the signal input end of the energy storage unit;
the voltage doubling unit boosts a voltage signal output by the intermediate frequency transformer, and the energy storage unit stores energy based on the voltage signal output by the voltage doubling unit; and the control unit controls the energy storage unit to release energy to the output port according to the compensation signal.
2. The arc energy compensation circuit of claim 1, wherein the voltage doubling unit comprises a first diode, a second diode, a third diode, and a first capacitor;
one end of the first capacitor is connected with the anode of the first diode and the cathode of the second diode respectively, the other end of the first capacitor is connected with the third output end of the intermediate frequency transformer, the anode of the second diode is connected with the first input end of the energy storage unit and the cathode of the third diode respectively, the anode of the third diode is connected with the second output end of the intermediate frequency transformer, and the cathode of the first diode is connected with the second input end of the energy storage unit.
3. The arc energy compensation circuit of claim 2, wherein the voltage doubling unit further comprises a first inductor and a first resistor;
the first inductor is connected in series between the first capacitor and the third output end of the intermediate frequency transformer, and the first resistor is connected in series between the second diode and the third diode.
4. The arc energy compensation circuit of claim 1, wherein the energy storage unit comprises a second capacitor and a switching tube;
one end of the second capacitor is connected with the second output end of the voltage doubling unit and the drain electrode of the switch tube respectively, the other end of the second capacitor is connected with the first output end of the voltage doubling unit, the source electrode of the switch tube is connected with the output port, and the base electrode of the switch tube is connected with the output end of the control unit.
5. The arc energy compensation circuit of claim 4, wherein the switching transistor is a depletion MOS transistor or a JFET transistor.
6. The arc energy compensation circuit of claim 1, wherein the control unit comprises an optocoupler, a second resistor, a fourth resistor, and a third capacitor;
the first input end of the optical coupler is connected with the main controller, the second input end of the optical coupler is grounded, the first power end of the optical coupler is connected with the power supply, the output end of the optical coupler is connected with one end of the second resistor, the second power end of the optical coupler is respectively connected with the output end of the energy storage unit, one end of the fourth resistor and one end of the third capacitor, and the other end of the second resistor is respectively connected with the other end of the fourth resistor, the other end of the third capacitor and the signal input end of the energy storage unit.
7. The arc energy compensation circuit of claim 6, wherein the control unit further comprises a third resistor and a fourth diode;
one end of the third resistor is connected with the common end of the second resistor and the third capacitor, the other end of the third resistor is connected with the anode of the fourth diode, and the cathode of the fourth diode is connected with the common end of the second resistor and the optocoupler.
8. The arc energy compensation circuit according to any of claims 1 to 7, further comprising a clamping unit;
the first end of the clamping unit is connected with the second input end of the voltage doubling unit, the second end of the clamping unit is connected with the first input end of the voltage doubling unit, the third end of the clamping unit is connected with the first output end of the intermediate frequency transformer, and the clamping unit is used for stabilizing the voltage in the circuit.
9. The arc energy compensation circuit of claim 8, wherein the clamping unit comprises a first bi-directional zener diode connected in series between the first input terminal and the second input terminal of the voltage doubler unit, and a second bi-directional zener diode connected in series between the first input terminal of the voltage doubler unit and the first output terminal of the if transformer.
10. A welder, characterized in that it comprises an arc energy compensation circuit according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921850700.4U CN211072169U (en) | 2019-10-30 | 2019-10-30 | Arc energy compensation circuit and welding machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921850700.4U CN211072169U (en) | 2019-10-30 | 2019-10-30 | Arc energy compensation circuit and welding machine |
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| CN211072169U true CN211072169U (en) | 2020-07-24 |
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| CN201921850700.4U Active CN211072169U (en) | 2019-10-30 | 2019-10-30 | Arc energy compensation circuit and welding machine |
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