WO2016204052A1 - アーク溶接装置 - Google Patents
アーク溶接装置 Download PDFInfo
- Publication number
- WO2016204052A1 WO2016204052A1 PCT/JP2016/067159 JP2016067159W WO2016204052A1 WO 2016204052 A1 WO2016204052 A1 WO 2016204052A1 JP 2016067159 W JP2016067159 W JP 2016067159W WO 2016204052 A1 WO2016204052 A1 WO 2016204052A1
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- WIPO (PCT)
- Prior art keywords
- inverter
- output
- switch element
- voltage
- transformer
- Prior art date
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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
- B23K9/073—Stabilising the arc
-
- 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
- B23K9/095—Monitoring or automatic control of welding parameters
- B23K9/0953—Monitoring or automatic control of welding parameters using computing means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- This invention relates to an arc welding apparatus equipped with an output current control device for reducing the amount of spatter generated.
- Patent Document 1 a circuit in which a switching module M in which a resistor R and a semiconductor switch element SW are connected in parallel is connected in series to an inverter secondary output circuit has been proposed.
- Patent Document 1 the following control is performed.
- the semiconductor switch element SW is turned on when the wire tip is in contact with the workpiece, and the semiconductor switch element SW is turned off at the timing when an arc occurs when the output current increases and the droplet at the wire tip separates from the wire.
- an arc is generated between the tip of the wire and the workpiece.
- the output current immediately before the arc is maximum, spatter is most likely to occur.
- the semiconductor switch element SW is turned off at the same timing, the current supply from the secondary side of the inverter is stopped at that moment, and as a result, the amount of spatter can be suppressed.
- the semiconductor switch element SW is turned off, the arc is maintained because the current due to the energy accumulated in the reactor L and the inductance of the output current cable is supplied to the load (between the wire tip and the workpiece) via the resistor R. .
- the semiconductor switch element When the load current drops below a certain level, the semiconductor switch element is turned on again, and the above operation is repeated.
- the above operation enables arc welding while suppressing the amount of spatter generated.
- An object of the present invention is to provide an arc welding apparatus that can eliminate the semiconductor switch element SW connected in series to the secondary side of the inverter, improve the efficiency of the power supply, and simplify the structure.
- the arc welding apparatus of this invention is An inverter with a switching circuit; A rectifier circuit connected to the output side of the inverter and rectifying the current of the inverter; A transformer comprising a primary winding and a secondary winding, wherein the primary winding is connected to the output side of the inverter and smoothes the rectified output rectified by the rectifier circuit; An output current supply terminal for welding the workpiece by supplying an output current of the primary winding of the transformer to the welding wire; A switch element connected between both terminals of the secondary winding of the transformer; An output voltage detector for detecting an output voltage between the welding wire and the workpiece; A control circuit for controlling the switching element and the switching circuit of the inverter, The control circuit includes: A first control unit that turns off the switching circuit of the inverter and turns on the switch element when the output voltage detected by the output voltage detector rises to a first predetermined voltage; A second control unit configured to turn on the switching circuit of the inverter and turn off the switch element after a predetermined time has elapse
- the smoothing reactor is constituted by a primary winding of a transformer, and a switch element connected between both terminals of the secondary winding of the transformer is turned off in a short-circuit state, and the output current is a predetermined value near the maximum. Is turned on, that is, when the output voltage detected by the output voltage detector rises to the first predetermined voltage.
- the short-circuit state is a state where the wire tip is in contact with the workpiece and the output current is increasing.
- the control circuit turns off the switching circuit of the inverter when the output voltage detected by the output voltage detector rises to the first predetermined voltage, that is, when the output current reaches a predetermined value near the maximum, and the switch element Turn on.
- This control is performed by the first control unit.
- the first control unit On the output side of the inverter, most of the energy accumulated in the primary winding of the transformer is induced (commutated) in the secondary winding. The reason for this is that when the secondary winding is short-circuited, the energy stored in the primary winding of the transformer is induced (commutated) in the secondary winding (secondary winding). Short circuit behaves as a flywheel that stores energy). For this reason, the output current flowing to the output side of the inverter is rapidly attenuated, and the occurrence of spatter is suppressed.
- a voltage source for applying a predetermined voltage in a direction of decreasing the output current via the switch element is provided between both terminals of the secondary winding.
- the switch element By turning on the switch element, most of the energy accumulated in the primary winding of the transformer is induced (commutated) in the secondary winding, but the external inductance on the secondary side of the inverter (inductance of the output current line) Therefore, the energy stored in the external inductance is consumed by the load on the secondary side of the inverter without being induced (commutated) by the secondary winding. Therefore, the slope of the attenuation curve of the output current greatly depends on the presence of the external inductance, and the slope of the attenuation does not become steeper as the external inductance increases.
- the voltage source applies a predetermined voltage to the secondary winding.
- This voltage is converted into a voltage determined by the turns ratio and induced in the primary winding, but is a voltage in a direction to lower the output current.
- the current based on this voltage cancels out the current depending on the external inductance, and the slope of the attenuation curve of the output current becomes steeper. That is, the output current flowing on the secondary side of the inverter is rapidly attenuated regardless of the magnitude of the external inductance. As a result, the occurrence of spatter is further suppressed.
- the fact that the current based on the voltage of the voltage source cancels the current depending on the external inductance means that the energy accumulated in the external inductance is induced (commutated) in the secondary winding.
- the control circuit turns on the switching element and then turns on the switching circuit of the inverter after a predetermined time has elapsed after turning on the switching element.
- This control is performed by the second control unit.
- the predetermined time is usually a short time of less than 1 ms, during which the output current decreases rapidly.
- control by the first control unit and the control by the second control unit are repeated to perform welding, but the generation of spatter is suppressed by the control of the first control unit.
- the loss is small and the power supply efficiency is good.
- the switch element When the switch element is turned on, the energy stored in the primary winding of the transformer is induced (commutated) in the secondary winding, so the output current on the output side of the inverter is rapidly attenuated and spatter is generated. Sufficiently suppressed. Further, at this time, since a predetermined voltage is generated in the primary winding of the transformer in a direction to lower the output current, the energy accumulated in the external inductance is induced (commutated) in the secondary winding, and the inverter The output current on the secondary side can be attenuated more rapidly.
- Partial circuit diagram of conventional arc welding equipment The partial circuit diagram of the arc welding apparatus which is embodiment of this invention Partial waveform diagram of an arc welding apparatus according to an embodiment of the present invention
- the partial circuit diagram of the arc welding apparatus which is other embodiment of this invention
- the partial waveform figure of the arc welding apparatus which is other embodiment of this invention
- FIG. 2 shows a partial circuit diagram of an arc welding apparatus according to an embodiment of the present invention.
- the power supply unit of this arc welding apparatus is composed of an inverter 1 having an AC power input and a switching circuit for switching an AC voltage.
- the output of the inverter 1 is transformed by the transformer 2, rectified by the rectifier diodes 3 and 4, and the rectified output is smoothed by the primary winding L1 of the transformer 5 functioning as a smoothing reactor.
- the rectified and smoothed output current is output to the torch 6 via the output current supply terminals 14a and 14b, and welding is performed between the welding wire 12 and the work 7 sent to the torch 6.
- the transformer 5 includes a primary winding L1 and a secondary winding L2, and the number of windings is n1 (L1) ⁇ n2 (L2).
- a switch element 8 is connected between both terminals of the secondary winding L2.
- a voltmeter 9 is connected between the ground line on the output side of the primary winding L1 and the torch 6.
- the voltage detection terminal of the voltmeter 9 is connected to the control unit 10, and the control output of the control unit 10 is connected to the PWM control unit 11 of the inverter 1 and the gate terminal of the switch element 8.
- the control unit 10 includes a first control unit 10a and a second control unit 10b.
- the PWM controller 11 supplies a PWM pulse to the switching circuit composed of four switching semiconductor elements in the inverter 1 to start the operation of the inverter 1.
- the inverter output is transformed by the transformer 2, rectified by the rectifier diodes 3, 4, further smoothed by the primary winding L 1 of the transformer 5, and output to the torch 6.
- the primary winding L ⁇ b> 1 is connected to the midpoint tap of the transformer 2, but may be connected to the output side of the rectifier diodes 3 and 4.
- the above control is performed by the control unit 10.
- a voltmeter 9 is connected to the control unit 10, and when the voltage detection value of the voltmeter 9 suddenly rises to a value near Va (first predetermined voltage), the output current becomes a predetermined value near the maximum.
- the signal for turning off the PWM control unit 11 is output to the PWM control unit 11 and the switch element 8 is turned on.
- This control is performed by the first control unit 10a of the control unit 10.
- an output current change S1 from t1 is an output current change when the above control is performed, and the output current change S2 temporarily turns off only the PWM control unit 11 at timing t1 and turns the switch element 8 off.
- the change in output current when not turned on is shown. S2 cannot sufficiently suppress the generation of sputtering because the current decrease is slower than S1, but S1 can sufficiently suppress the generation of sputtering because the current decrease is steep.
- the control unit 10 When a predetermined time T (less than 1 ms) elapses and timing t2 is reached, the control unit 10 outputs a signal for turning on the PWM control unit 11 to the PWM control unit 11, and turns off the switch element 8. Let This control is performed by the second control means 10b of the control unit 10. At this time, on the secondary side of the inverter, the energy induced (commutated) in the secondary winding L2 of the transformer 5 is reinducted (commutated) into the original primary winding L1. This is because when the switch element 8 is turned off, the secondary winding L2 of the transformer 5 is opened (the energy accumulated in the flywheel circuit is reinducted into the primary winding L1). ) At this time, since the energy returned from the secondary winding L2 to the primary winding L1 is effectively consumed as an output current, the output current flowing to the inverter secondary side rises rapidly.
- the number of turns n2 of the secondary winding L2 of the transformer 5 is set to be several times the number of turns n1 of the primary winding L1 from the viewpoint of reducing the current flowing through the switch element 8. preferable.
- n1: n2 1: 5.
- the current flowing through the switch element 8 at the predetermined time T when the switch element 8 is on is 5 minutes of the current flowing through the primary winding L1 when the switch element 8 is off. Reduced to 1.
- the switch element 8 can be configured with a small rated current by appropriately selecting the turn ratio.
- the timing t2 can be set based on the detected voltage value of the voltmeter 9. As can be seen from FIG. 3, the output voltage rises rapidly at t1 and gradually decreases. Therefore, it is possible to set the timing t2 when this voltage drops to a predetermined second predetermined voltage Vb. However, since the arc state is unstable, the second predetermined voltage Vb is also unstable. Therefore, it is preferable that the timing t2 is when a predetermined time T has elapsed from the timing t1.
- a transformer having a smoothing reactor as a primary winding is connected to the secondary side of the inverter, and a switch element is connected between both terminals of the secondary winding of the transformer.
- FIG. 4 shows a partial circuit diagram of an arc welding apparatus according to another embodiment of the present invention.
- the same parts as those in FIG. 2 are denoted by the same reference numerals.
- the power supply unit of this arc welding apparatus is composed of an inverter 1 that receives an AC power supply.
- the output of the inverter 1 is transformed by the transformer 2, rectified by the rectifier diodes 3 and 4, and the rectified output is smoothed by the primary winding L1 of the transformer 5 functioning as a smoothing reactor.
- the rectified and smoothed output current is output to the torch 6 via the output current supply terminals 14a and 14b, and welding is performed between the welding wire 12 and the work 7 sent to the torch 6.
- the transformer 5 includes a primary winding L1 and a secondary winding L2, and the number of windings is n1 (L1) ⁇ n2 (L2).
- a switch element 8 is connected between both terminals of the secondary winding L2.
- a voltage source 13 that generates a DC voltage E is connected to the switch element 8.
- the polarity connection direction of the voltage source E is a direction in which the output current is lowered when the switch element 8 is turned on.
- a voltmeter 9 is connected between the ground line on the output side of the primary winding L1 and the torch 6.
- the voltage detection terminal of the voltmeter 9 is connected to the control unit 10, and the control output of the control unit 10 is connected to the PWM control unit 11 of the inverter 1 and the gate terminal of the switch element 8.
- the control unit 10 includes a first control unit 10a and a second control unit 10b.
- the PWM controller 11 supplies a PWM pulse to the switching circuit composed of four switching semiconductor elements in the inverter 1 to start the operation of the inverter 1.
- the inverter output is transformed by the transformer 2, rectified by the rectifier diodes 3, 4, further smoothed by the primary winding L 1 of the transformer 5, and output to the torch 6.
- the primary winding L1 is connected to the midpoint tap of the transformer 2, but it may be connected to the output side of the rectifier diodes 3 and 4.
- the above control is performed by the control unit 10.
- a voltmeter 9 is connected to the control unit 10, and when the voltage detection value of the voltmeter 9 suddenly rises to a value near Va (first predetermined voltage), the output current becomes a predetermined value near the maximum.
- the signal for turning off the PWM control unit 11 is output to the PWM control unit 11 and the switch element 8 is turned on.
- This control is performed by the first control unit 10a of the control unit 10.
- the voltage source 13 applies a predetermined DC voltage E to the secondary winding L2.
- This voltage is converted into a voltage determined by the turns ratio and is induced in the primary winding L1, but is a voltage in a direction to decrease the output current.
- the current based on this voltage cancels out the current depending on the energy stored in the external inductance, and the slope of the attenuation curve of the output current becomes steeper. That is, the output current flowing on the secondary side of the inverter is rapidly attenuated regardless of the magnitude of the external inductance. As a result, the occurrence of spatter is further suppressed.
- the fact that the current based on the voltage of the voltage source cancels out the current dependent on the energy stored in the external inductance means that the energy stored in the external inductance is equivalently induced (converted) in the secondary winding L2. To be flowed).
- the control unit 10 When a predetermined time T (less than 1 ms) elapses and timing t2 is reached, the control unit 10 outputs a signal for turning on the PWM control unit 11 to the PWM control unit 11, and turns off the switch element 8.
- T a predetermined time
- an output current change S1 indicates a current decay curve that changes due to the above operation.
- the output current change S2 (Comparative Example 1) is an output when only the PWM control unit 11 is turned off at timing t1 without connecting the switch element 8 and the voltage source 13 to the secondary winding L2 of the transformer 5. It shows the current change.
- the output current since the output current attenuates based on the energy accumulated in the inductance L1 of the secondary winding L2 of the transformer 5 and the external inductance L, the current decrease in S2 is slower than that in S1. Therefore, the generation of spatter cannot be sufficiently suppressed.
- the output current change S3 (Comparative Example 2) is connected to the secondary winding L2 of the transformer 5, the switch source 8 is not connected, the PWM control unit 11 is turned off at the timing t1, and the switch element A change in output current when 8 is turned on is shown.
- the energy of the secondary winding L1 of the transformer 5 is induced (commutated) in the secondary winding L2, so that the output current is attenuated based only on the energy accumulated in the external inductance L.
- the attenuation curve of S3 is steeper than that of S2, and the occurrence of sputtering can be sufficiently suppressed.
- the attenuation curve is gentler than S1 of the present embodiment.
- FIG. 6 shows the output current i (t) in terms of mathematical expressions for the output current change S1 of the present embodiment and the output current changes S2 and S3 of Comparative Examples 1 and 2.
- the second term on the right side represents the decrease in output current due to the inductance component.
- the exponential coefficient of the second term is i (0), which is the initial value of the current supplied from the primary side of the transformer 2 at the timing t1, and the initial value of the current supplied from the voltage source 13 (V1 ⁇ VF) / R.
- V1 ⁇ VF voltage source 13
- (Formula 2) 6 is an equation showing an output current change S2 of Comparative Example 1 in which the switch element 8 and the voltage source 13 are not connected to the secondary winding L2 of the transformer 5. PWM is turned off at timing t1.
- the right side represents an exponential decay curve as an initial value i (0).
- the inductance components at this time are the inductance of the primary winding L1 of the transformer 5 and the external inductance L. For this reason, the attenuation curve of the output current is gentle.
- the right side represents an exponential decay curve as an initial value i (0).
- the inductance component at this time is only the external inductance L. For this reason, the attenuation curve of the output current becomes steep. However, it is slower than Equation 1.
- FIG. 7 shows simulation waveforms of the output current changes S1 to S3. As shown in the figure, since S1 is the steepest, the effect of suppressing the generation of spatter is the highest. Note that the current does not become negative because of the rectifier diodes 3 and 4.
- the number of turns n2 of the secondary winding L2 of the transformer 5 is set to be several times the number of turns n1 of the primary winding L1 from the viewpoint of reducing the current flowing through the switch element 8. preferable.
- n1: n2 1: 5.
- the current flowing through the switch element 8 at the predetermined time T when the switch element 8 is on is 5 minutes of the current flowing through the primary winding L1 when the switch element 8 is off. Reduced to 1.
- the switch element 8 can be configured with a small rated current by appropriately selecting the turn ratio.
- the timing t2 can be set based on the detected voltage value of the voltmeter 9. As can be seen from FIG. 5, the output voltage rises rapidly at t1 and gradually decreases. Therefore, it is possible to set the timing t2 when this voltage drops to a predetermined second predetermined voltage Vb. However, since the arc state is unstable, the second predetermined voltage Vb is also unstable. Therefore, it is preferable that the timing t2 is when a predetermined time T has elapsed from the timing t1.
- the attenuation curve of the output current change S1 can be changed depending on the voltage of the voltage source 13, but if the attenuation curve is made steeper than necessary by making the voltage too high, the arc There is a possibility of disappearing. Therefore, in order to set an optimum voltage for stabilizing the arc and suppressing the occurrence of spatter, it is preferable to make this voltage variable.
- a transformer having a smoothing reactor as a primary winding is connected to the inverter secondary side, and a switch element is connected between both terminals of the secondary winding of the transformer. Further, a voltage source for applying a predetermined voltage in the direction of decreasing the output current is connected between both terminals of the secondary winding via the switch element.
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Abstract
Description
スイッチング回路を備えたインバータと、
前記インバータの出力側に接続され、前記インバータの電流を整流する整流回路と、
一次巻線と二次巻線を備え、前記一次巻線は前記インバータの出力側に接続され、前記整流回路で整流された整流出力を平滑するトランスと、
前記トランスの一次巻線の出力電流を溶接ワイヤに供給することによりワークに対し溶接をする出力電流供給端子と、
前記トランスの二次巻線の両端子間に接続されたスイッチ素子と、
前記溶接ワイヤと前記ワーク間の出力電圧を検出する出力電圧検出器と、
前記スイッチ素子と前記インバータのスイッチング回路とを制御する制御回路と、を備え、
前記制御回路は、
前記出力電圧検出器で検出した出力電圧が、第1の所定電圧に上昇したときに前記インバータのスイッチング回路をオフし、且つ前記スイッチ素子をオンする第1制御部と、
前記スイッチ素子をオンした後、所定時間経過後に前記インバータのスイッチング回路をオンし、且つ前記スイッチ素子をオフする第2制御部を備える。
i(0)―タイミングt1の出力電流
i(t)-タイミングt1からT時間後の出力電流
L1-トランス5の一次巻線L1のインダクタンス
L-外部インダクタンス
R-出力インピーダンス
VF-整流回路のダイオード3、4の順方向降下電圧
n1-トランス5の一次巻線L1の巻線数
n2-トランス5の二次巻線L2の巻線数
E-電圧源13のDC電圧
V1-電圧源Eによるトランス5の一次巻線L1の誘導電圧
(式1)
トランス5の二次巻線L2にスイッチ素子8と電圧源13が接続されている本実施形態の出力電流変化S1を示す式である。タイミングt1にてPWMがオフし、スイッチ素子8がオンする。
トランス5の二次巻線L2にスイッチ素子8と電圧源13が共に接続されていない比較例1の出力電流変化S2を示す式である。タイミングt1にてPWMがオフする。
トランス5の二次巻線L2にスイッチ素子8が接続され、電圧源13が接続されていない比較例2の出力電流変化S3を示す式である。タイミングt1にてPWMがオフし、スイッチ素子8がオンする。
5-トランス
6-トーチ
7-ワーク
8-スイッチ素子
10-制御部
13-電圧源
Claims (5)
- スイッチング回路を備えたインバータと、
前記インバータの出力側に接続され、前記インバータの出力を整流する整流回路と、
一次巻線と二次巻線を備え、前記一次巻線は前記インバータの出力側に接続され、前記整流回路で整流された整流出力を平滑するトランスと、
前記トランスの一次巻線の出力電流を溶接ワイヤに供給することによりワークに対し溶接をする出力電流供給端子と、
前記トランスの二次巻線の両端子間に接続されたスイッチ素子と、
前記溶接ワイヤと前記ワーク間の出力電圧を検出する出力電圧検出器と、
前記スイッチ素子と前記インバータのスイッチング回路とを制御する制御回路と、を備え
前記制御回路は、
前記出力電圧検出器で検出した出力電圧が、第1の所定電圧に上昇したときに前記インバータのスイッチング回路をオフし、且つ前記スイッチ素子をオンする第1制御部と、
前記スイッチ素子をオンした後、所定時間経過後に前記インバータのスイッチング回路をオンし、且つ前記スイッチ素子をオフする第2制御部を備える、アーク溶接装置。 - 前記二次巻線の両端子間に前記スイッチ素子を介して、前記出力電流を下げる方向に所定の電圧を印加する電圧源を更に備えた、請求項1記載のアーク溶接装置。
- 前記一次巻線と前記二次巻線の巻線比はn:1(nは2以上)である請求項1又は2記載のアーク溶接装置。
- 前記制御回路は、前記スイッチ素子をオンしたときから、前記出力電圧検出器で検出した出力電圧が第2の所定電圧に低下するときまでの時間を前記所定時間と判定する、請求項1~3のいずれかに記載のアーク溶接装置。
- 前記電圧源の電圧源は可変電圧源である、請求項2に記載のアーク溶接装置。
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US15/576,411 US10086463B2 (en) | 2015-06-18 | 2016-06-09 | Arc welding apparatus |
JP2017525172A JP6259955B2 (ja) | 2015-06-18 | 2016-06-09 | アーク溶接装置 |
CN201680033249.XA CN107614179B (zh) | 2015-06-18 | 2016-06-09 | 电弧焊装置 |
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CN107614179A (zh) | 2018-01-19 |
US10086463B2 (en) | 2018-10-02 |
CN107614179B (zh) | 2019-01-15 |
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