WO2023087743A1 - 交流换向维弧电路及交流焊接电源 - Google Patents

交流换向维弧电路及交流焊接电源 Download PDF

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WO2023087743A1
WO2023087743A1 PCT/CN2022/104303 CN2022104303W WO2023087743A1 WO 2023087743 A1 WO2023087743 A1 WO 2023087743A1 CN 2022104303 W CN2022104303 W CN 2022104303W WO 2023087743 A1 WO2023087743 A1 WO 2023087743A1
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Prior art keywords
circuit
arc
commutation
maintenance
capacitor
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PCT/CN2022/104303
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English (en)
French (fr)
Inventor
兰照丹
王光辉
陈浩
王丽霞
刘礼军
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杭州凯尔达电焊机有限公司
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Publication of WO2023087743A1 publication Critical patent/WO2023087743A1/zh

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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
    • 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
    • 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
    • B23K9/0732—Stabilising of the arc current
    • 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
    • B23K9/09—Arrangements or circuits for arc welding with pulsed current or voltage
    • B23K9/091—Arrangements or circuits for arc welding with pulsed current or voltage characterised by the circuits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/10—Other electric circuits therefor; Protective circuits; Remote controls
    • B23K9/1081—Arc welding by means of accumulated energy
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • 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

  • the invention relates to the field of welding, and in particular to an AC commutation arc maintenance circuit and an AC welding power source.
  • AC argon arc welding power supply has become an ideal choice for aluminum and its alloys in welding processing equipment.
  • DCEN negative
  • DCEP tungsten connecting positive
  • the operating frequency of the arc maintenance device will also increase.
  • the capacity of the device storing the arc maintenance energy and the power of the current limiting resistor must be adjusted.
  • the double increase not only the high cost and large volume of the arc-dimensional circuit, but also the problems of high device power and high heat generation. Based on the above problems, it is difficult to realize high-frequency AC welding in the existing arc-dimensional circuit.
  • the present invention provides an AC commutation arc maintenance circuit and an AC welding power source for high-frequency AC welding with small device capacity.
  • the present invention provides an AC commutation arc maintenance circuit, which is connected to the main circuit of an AC welding power supply and includes an arc maintenance AC input, a first capacitor, a rectification filter circuit and an output circuit.
  • the first capacitor is connected in series with the output end of the AC input circuit of the DC to limit the output current of the AC input circuit of the DC.
  • the rectifying and filtering circuit includes a rectifier and a second capacitor, and the arc-maintaining AC input charges the second capacitor through the first capacitor and the rectifier.
  • the output loop includes a positive connection control switch connected to the output of the rectification and filtering circuit, and the positive connection control switch is configured to connect the AC commutation arc maintenance circuit into or out of the electrode positive connection loop of the main circuit.
  • the positive connection control switch is turned on, and the charged second capacitor provides arc maintenance voltage and arc maintenance pulse current for the electrode positive connection circuit, and the arc maintenance input circuit provides maintenance current to the electrode positive connection circuit .
  • the positive connection control switch when the main circuit is commutated from negative electrode connection to positive electrode connection, the positive connection control switch is turned on before the commutation zero crossing, and the AC commutation arc maintenance circuit is connected to the main circuit in advance.
  • the auxiliary transformer participates in the PI control of the welding power source based on the welding circuit current, and when the forward control switch is turned on, the voltage of the auxiliary transformer is output at the maximum state.
  • the arc-maintaining AC input is an auxiliary transformer connected in parallel with the main transformer on the main circuit to the primary inverter output of the welding power supply.
  • the AC commutation arc maintenance circuit further includes a current limiting element connected to the output end of the rectification filter circuit, and the current limiting element limits the output arc maintenance pulse current.
  • the current limiting element is an inductor
  • the AC commutation maintenance arc further includes a discharge circuit connected to the inductor.
  • the forward control switch is turned off, the flyback voltage of the inductor is discharged through the discharge circuit.
  • the discharge circuit is a freewheeling diode connected in parallel to both ends of the inductor or an RC snubber circuit connected in parallel to both ends of the inductor.
  • the AC commutation arc maintenance circuit further includes a diode connected to the output side of the rectification filter circuit, and the diode blocks the voltage and current of the main circuit from being superimposed on the AC commutation arc maintenance circuit.
  • the output circuit further includes a negative connection control switch connected to the output of the rectification and filtering circuit, and the negative connection control switch is configured to connect the AC commutation arc maintenance circuit into or out of the negative connection of the electrode of the main circuit. loop; when the main circuit changes direction from positive electrode connection to negative electrode connection, the negative connection control switch is turned on and the positive connection control switch is turned off.
  • the present invention also provides an AC welding power source, which includes a main circuit and the aforementioned AC commutation arc maintenance circuit.
  • the main circuit is a half-bridge inverter circuit or a full-bridge inverter circuit.
  • the high-frequency AC power formed by the arc maintenance AC input charges the second capacitor through the first capacitor and the rectifier to store the arc maintenance energy .
  • the positive connection control switch When the positive connection control switch is turned on, the charged second capacitor provides arc maintenance voltage and arc maintenance pulse current for the electrode positive connection circuit, providing conditions for the re-ignition of the arc after commutation.
  • the arc-maintaining AC input continues to provide a small maintenance current to the positive connection circuit of the electrode through the first capacitor to ensure the continuity of the welding arc during the polarity switching process.
  • the power of the device connected to the output terminal of the second capacitor can also be set to be smaller, so as to realize the miniaturization design of the device at high frequency.
  • the energy of the maintenance arc is continuously supplemented after the second capacitor is discharged, which not only further reduces the requirement for the capacity of the second capacitor, but also greatly improves the stability of the maintenance arc.
  • using the first capacitor to limit the current not only greatly reduces the energy loss caused by the current limit, but also has a small device capacity and a small amount of heat generated by the device.
  • FIG. 1 is a schematic structural diagram of an AC commutation arc maintenance circuit provided by an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of the structure of the AC power supply with the AC commutation arc power and the half-bridge secondary inverter structure shown in FIG. 1 .
  • FIG. 3 is a schematic diagram of current flow in the AC commutation arc maintenance circuit in FIG. 2 in a charging state.
  • FIG. 4 and FIG. 5 are schematic diagrams showing the current flow direction of the AC commutation arc maintenance circuit in the arc maintenance output state in FIG. 2 .
  • Fig. 6 shows the timing diagram of the output current of the main circuit, the output current of the AC commutation arc maintenance circuit and the arc current of the welding circuit in Fig. 2 .
  • FIG. 7 is a schematic diagram of the structure of the AC commutated arc current connected to the main circuit of the half-bridge secondary inverter structure provided by another embodiment of the present invention.
  • the arc-maintaining energy stored on the capacitor comes from the charging of the main circuit in half a cycle.
  • the capacitor after the last arc discharge is too late to be charged through the bus, resulting in insufficient arc energy for the next arc, which cannot meet the high-frequency welding requirements.
  • the capacity of the capacitor and the power of the corresponding device can only be increased, but this will bring problems of cost, volume and heat generation.
  • there is also an arc maintenance device that uses a pre-charged capacitor to increase the commutation voltage of the main circuit bus.
  • the charging capacitor only serves to increase the commutation voltage, and it does not output current to the welding circuit. ; Since the degree of ionization in the arc space is very low during commutation, there are still some difficulties in establishing the arc solely by the boost of voltage.
  • the present embodiment provides an AC commutation arc maintenance circuit 40, which is connected to the main circuit 30 of the AC welding power source and includes an arc maintenance AC input, a first capacitor C1, a rectification filter circuit and an output circuit.
  • the first capacitor C1 is connected in series with the output terminal of the AC input of the V-arc to limit the output current of the AC input of the V-arc.
  • the rectification and filtering circuit includes a rectifier B1 and a second capacitor C2, and the arc-maintaining AC input charges the second capacitor C2 through the first capacitor C1 and the rectifier B1.
  • the output circuit includes a positive connection control switch Q3 connected to the output of the rectification and filtering circuit, and the positive connection control switch Q3 is configured to connect the AC commutation arc maintenance circuit into or cut out the electrode positive connection circuit of the main circuit 30;
  • the positive connection control switch Q3 When the electrode is positively connected, the positive connection control switch Q3 is turned on, and the charged second capacitor C2 provides arc maintenance voltage and arc maintenance pulse current for the electrode positive connection circuit, and the arc maintenance input circuit provides a maintenance current for the electrode positive connection circuit.
  • the arc-maintaining energy of the AC commutation arc-maintaining circuit 40 comes from the second capacitor C2 charged by the arc-maintaining input circuit The sustaining current output by the maintenance arc input circuit through the first capacitor C1.
  • the positive connection control switch Q3 when the positive connection control switch Q3 is turned on, the charged second capacitor C2 quickly provides a sufficiently high arc-maintaining voltage and arc-maintaining pulse current to the electrode positive circuit to establish a restrike condition.
  • the voltage and current of the second capacitor C2 gradually decrease.
  • the arc-maintaining input circuit will continue to provide a maintaining current for the electrode positive connection circuit to maintain the arc stability after limiting the current through the first capacitor C1, so as to ensure that the arc can continue to burn.
  • the provision of the arc-maintaining energy in the AC commutation arc-maintaining circuit 40 does not depend on the AC inverter frequency on the main circuit 30 at all, thereby well removing the limitation of the device capacity by the AC inverter frequency.
  • the capacity of the second capacitor C2 does not need to increase with the increase of the inverter frequency. Further, after the second capacitor C2 is discharged, the arc maintenance input circuit is continuously supplemented by the maintenance current output from the first capacitor C1, which greatly prolongs the supply time of the current required for arc maintenance.
  • the arc-dimensional input circuit is required to be able to provide a high voltage of at least 300V.
  • the maintenance current output by the arc-maintaining input circuit it should be as small as possible under the premise of satisfying the continuity of the arc, so as to reduce its influence on the welding current characteristics of the main circuit after being superimposed on the output current of the main circuit. Therefore, it is necessary to limit the holding current.
  • the arc-maintaining input circuit is an auxiliary transformer T2 connected to the output of the primary inverter 20 of the welding power source.
  • the arc-maintaining input circuit can also be an auxiliary transformer connected to the secondary side of the main transformer on the main circuit; or an external AC voltage source.
  • the AC current output by the auxiliary transformer T2 first passes through the first capacitor C1 connected in series in the circuit, and enters the rectifier B1 after being limited by the capacitive reactance of the first capacitor C1 .
  • the first capacitor C1 without energy loss is used to block and limit the AC current, which can not only ensure the high voltage output of the auxiliary transformer T2 but also reduce the heat generation and volume of the device. Small.
  • the AC commutation arc maintenance circuit 40 also includes a current limiting element connected to the output end of the rectification filter circuit, and the current limiting element limits the arc maintenance pulse current output when the second capacitor C2 is discharged.
  • the current limiting element is an inductor L1.
  • the positive connection control switch Q3 is turned off to switch the AC commutation arc maintenance circuit 40 out of the main circuit 30 .
  • the setting of the inductor L1 is such that when the positive control switch Q3 is turned off, it will generate a flyback voltage and apply it to the positive control switch Q3.
  • the AC commutation maintenance arc circuit also includes a discharge circuit connected to the inductor L1.
  • the discharge circuit is a freewheeling diode D2 connected in parallel to both ends of the inductor.
  • the present invention does not make any limitation thereto.
  • an RC snubber circuit connected in parallel to both ends of the inductor L1 can also be used as the discharge circuit.
  • no discharge circuit may be provided.
  • the tungsten electrode is a hot cathode, and the aluminum workpiece is a cold cathode; the tungsten electrode has a strong electron thermal emission capability and the workpiece aluminum. Therefore, during the welding process, the polarity switching process from tungsten electrode to positive (DCEP) to tungsten electrode to negative (DCEN) is slower than the re-ignition of the tungsten electrode to negative (DCEN) to tungsten electrode to positive (DCEP) arc. Much easier; commutation arc breaking usually occurs during polarity switching from tungsten to negative (DCEN) to tungsten to positive (DCEP). Therefore, in this embodiment, the positive connection control switch Q3 is used in the output circuit to connect the AC commutation arc maintenance circuit 40 into the electrode positive connection circuit of the main circuit 30 . However, the present invention does not make any limitation thereto.
  • the output circuit includes positive connection control switches Q3 and Q4, both of which are turned on or off synchronously to connect the AC commutation arc maintenance circuit into or out of the electrode positive connection circuit of the main circuit.
  • the output circuit also includes negative connection control switches Q5 and Q6 connected to the output of the rectification and filtering circuit.
  • the negative connection control switches Q5 and Q6 are configured to connect the AC commutation arc maintenance circuit into or out of the electrode negative connection circuit of the main circuit 30 .
  • the negative connection control switches Q5 and Q6 are turned on and the positive connection control switches Q3 and Q4 are turned off.
  • the auxiliary transformer T2, the first capacitor C1, the rectifier B1 and the charged second capacitor C2 will control the negative connection circuit of the electrodes through the negative connection control switches Q5, Q6, inductor L2 and diode D3 (that is, the switching tube Q1 on the main circuit is turned on When the loop) provides arc maintenance voltage, arc maintenance pulse current and maintenance voltage, wherein the diode D4 is a freewheeling diode connected in parallel to both ends of the inductor L2.
  • the output circuit including positive connection control switches Q3, Q4 and negative connection control switches Q5, Q6 realizes arc maintenance assistance when the main circuit is zero-crossing and commutating in two directions, and can be used for the main circuit of the half-bridge secondary inverter structure. It can also be used in the main circuit of the full bridge secondary inverter structure.
  • Fig. 2 is a schematic diagram of the structure of the AC commutation arc maintenance circuit applied to the half-bridge secondary inverter welding power supply provided by this embodiment.
  • the main circuit includes a switch tube Q1, a switch tube Q2 and diodes VD1 and VD2.
  • the switching tube Q1 and the switching tube Q2 are turned on alternately to form an electrode negative connection circuit and an electrode positive connection circuit respectively.
  • the arc maintenance process of the AC commutation arc maintenance circuit will be described in detail below with reference to FIGS. 3 to 6 .
  • FIG. 4 When the switching tube Q1 in the main circuit 30 is turned off, the switching tube Q2 is turned on. The current direction of the AC welding power supply starts to change, and the welding current flows: main transformer T1 center tap ⁇ inductor DCL ⁇ welding circuit arc - ⁇ welding circuit arc + ⁇ switch tube Q2 ⁇ common mode inductor Lb ⁇ diode VD3 or diode VD4 ⁇ main transformer T1 ; Form a positive electrode connection loop, as shown by the black solid arrow in Figure 4.
  • the switch tube Q1 is turned off; while the switch tube Q2 is turned on, the positively connected control switch Q3 is turned on.
  • the energy stored in the second capacitor C2 passes through the positively connected control switch Q3 ⁇ Inductor L1 ⁇ diode D1 ⁇ inductor DCL ⁇ welding circuit arc- ⁇ welding circuit arc+ ⁇ switch tube Q2 ⁇ common mode inductor Lb ⁇ return to the second capacitor C2; as shown by the hollow arrow in FIG. 4 .
  • the second capacitor C2 quickly superimposes the arc-maintaining voltage and arc-maintaining pulse current to the electrode positive circuit at the moment when the switch tube Q2 and the positive connection control switch Q3 are turned on, providing conditions for the re-establishment of the arc in the welding circuit when the switch tube Q2 is turned on, ensuring the replacement Continuity of backward arc.
  • the stored energy decreases, and the state shown in FIG. 5 will be entered at this time.
  • Fig. 5 As shown by the hollow arrow, at this time, the sustaining current output by the auxiliary transformer T2 is superimposed on the discharge current of the second capacitor C2 and then output to the electrode positive connection circuit. At this time, although the energy stored in the second capacitor C2 decreases, the maintenance current output by the auxiliary transformer T2 will continue to provide energy to ensure that the established arc continues to burn and maintain the continuity of the arc. Since the discharge current of the second capacitor C2 gradually decreases, the superposition of the maintenance current is shown in the timing diagram to delay the decline rate of the output current of the maintenance auxiliary circuit, as shown in the slope decline rate on the right side of the maintenance arc current pulse in Figure 6(b) .
  • the positive connection control switch Q3 is turned off, and the AC reversing arc maintenance circuit is cut out from the main circuit 30, which will not affect the welding voltage and current in the half cycle after the main circuit 30 is reversing.
  • the main circuit has very good voltage and current characteristics.
  • the direct connection control switch Q3 is turned off, the auxiliary transformer T2 still continues to generate an AC voltage with the same high frequency as the primary inverter 20 .
  • the first capacitor C1 is connected in series in the output circuit of the auxiliary transformer T2 to limit its output current.
  • the AC voltage is rectified by the rectifier bridge B1 and stored in the second capacitor C2 to provide energy for the next maintenance arc, as shown in Figure 3.
  • Fig. 6 (a) is the timing diagram of the output current of the main circuit; (b) is the timing diagram of the output current of the AC commutation arc maintenance circuit; (c) the timing diagram of the arc current of the welding circuit.
  • the AC commutation arc maintenance circuit outputs superimposed arc maintenance pulse current and maintenance current when the main circuit current commutates. After a sufficient arc current is established in the welding circuit (indicated to re-ignite the arc), the pulse current is rapidly reduced to zero with the closing of the positive control switch Q3, so that it no longer affects the main circuit.
  • the AC commutation arc maintenance circuit when the positive control switch Q3 is turned on, in order to prevent the voltage and current of the main circuit from being superimposed on the AC commutation arc maintenance circuit, the AC commutation arc maintenance circuit also includes a diode connected to the output side of the rectification filter circuit D1, the diode D1 ensures the unidirectional flow of current.
  • the positive connection control switch Q3 is turned on synchronously with the switch tube Q2.
  • the present invention does not make any limitation thereto.
  • the positive connection control switch Q3 when the main circuit is commutated from the negative electrode connection to the positive electrode connection (switch Q2 is turned on, and the switch tube Q1 is turned off), the positive connection control switch Q3 is turned on before the commutation zero crossing point, and the AC commutation arc maintenance circuit is preliminarily 40 is connected to the main circuit 30 . Before the zero crossing point, the welding current still passes through the electrode negative connection circuit, and the AC reversing arc maintenance circuit provides the welding circuit with a current from the welding circuit arc- ⁇ the welding circuit arc+, which is opposite to the current in the electrode negative connection circuit.
  • the pre-connected AC commutation arc maintenance circuit can also more quickly provide arc maintenance voltage and arc maintenance current pulses for the electrode positive connection circuit when the switch tube Q2 is turned on.
  • the auxiliary transformer T2 is set to participate in the PI control of the welding power source based on the welding circuit current.
  • the direct connection control switch Q3 When the direct connection control switch Q3 is turned on, the voltage of the auxiliary transformer T2 is output at the maximum state.
  • the positive connection control switch Q3 when the positive connection control switch Q3 is turned on, the current of the welding circuit in the main circuit 30 is very small; based on this current, the PI control system of the welding power source will increase the output voltage of the auxiliary transformer T2 so that it is at Maximum status output (eg 300V).
  • the arc-maintaining voltage superimposed on the electrode positive circuit will also be at the maximum value, which is more conducive to commutation and arc-maintaining.
  • the present invention does not make any limitation thereto.
  • the auxiliary transformer T2 when the auxiliary transformer T2 controls the output voltage with a fixed pulse width enough to ensure that the main circuit can re-ignite the arc when switching from tungsten electrode to negative (DCEN) to tungsten electrode to positive (DCEP), the auxiliary transformer T2 also Fixed pulse width control can be used. Of course, in this control state, the auxiliary transformer T2 is always at the maximum and fixed state output.
  • this embodiment also provides an AC welding power supply.
  • the arc circuit 40 and the main circuit 30 are half-bridge inverter circuits.
  • the high-frequency AC power formed by the arc maintenance AC input charges the second capacitor through the first capacitor and the rectifier to store the arc maintenance energy .
  • the positive connection control switch When the positive connection control switch is turned on, the charged second capacitor provides arc maintenance voltage and arc maintenance pulse current for the electrode positive connection circuit, providing conditions for the re-ignition of the arc after commutation.
  • the arc-maintaining AC input continues to provide a small maintenance current to the positive connection circuit of the electrode through the first capacitor to ensure the continuity of the welding arc during the polarity switching process.
  • the power of the device connected to the output terminal of the second capacitor can also be set to be smaller, so as to realize the miniaturization design of the device at high frequency.
  • the energy of the maintenance arc is continuously supplemented after the second capacitor is discharged, which not only further reduces the requirement for the capacity of the second capacitor, but also greatly improves the stability of the maintenance arc.
  • using the first capacitor to limit the current not only greatly reduces the energy loss caused by the current limit, but also has a small device capacity and a small amount of heat generated by the device.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding Control (AREA)

Abstract

提供一种交流换向维弧电路（40）及交流焊接电源，交流换向维弧电路（40）连接于交流焊接电源的主电路（30）且包括维弧交流输入、第一电容（C1）、整流滤波电路以及输出回路。第一电容（C1）串联连接于维弧交流输入的输出端，限制维弧交流输入电路的输出电流。整流滤波电路包括整流器（B1）和第二电容（C2），维弧交流输入经第一电容（C1）和整流器（B1）对第二电容（C2）充电。输出回路包括连接于整流滤波电路输出的正接控制开关（Q3），正接控制开关（Q3）被配置为将交流换向维弧电路（40）接入或切出主电路（30）的电极正接回路。当主电路（30）从电极负接换向至电极正接时，正接控制开关（Q3）导通，被充电的第二电容（C2）为电极正接回路提供维弧电压和维弧脉冲电流，维弧输入电路向电极正接回路提供维持电流。

Description

交流换向维弧电路及交流焊接电源 技术领域
本发明涉及焊接领域，且特别涉及一种交流换向维弧电路及交流焊接电源。
背景技术
在现代化工业建设进程中，基于铝采用的广泛应用以及交流氩弧焊接电源在铝及其合金加工过程中的优势，交流氩弧焊接电源成为了铝及其合金在焊接加工设备方面的理想选择。然而，交流氩弧焊在电流过零点或小电流焊接时，由于电弧空间的温度较低，残余的电离度较小；再引燃存在困难，容易造成断弧的现象；如TIG焊中钨极接负(DCEN)到钨极接正(DCEP)的极性切换过程。
在现有的半桥结构的二次逆变拓扑焊接电源中，为确保电弧的稳定性，通常在逆变主电路的输出正负端及主变压器中心抽头增加电阻、电容等功率器件来储存电压，在DCEN到DCEP的极性切换过程时，该电压可通过限流电阻或电感叠加到焊接回路中，从而实现换向的再燃弧。在该电路结构中，需要较大容量的第二电容来储存维弧能量，同时在维弧回路中需要功率较大的电阻来限制维弧电流的大小。当交流逆变频率变大(如500HZ)时，维弧装置的工作频率也会随着增大，为保证维弧的稳定性，存储维弧能量的器件容量和限流电阻的功率都要成倍的增加，不仅维弧电路成本高、体积大，同时还存在器件功率大，发热大等问题。基于上述问题，现有维弧电路很难实现高频交流焊接。
发明内容
本发明为了克服现有技术的至少一个不足，提供一种用于高频交流焊接且器件容量小的交流换向维弧电路及交流焊接电源。
为了实现上述目的，本发明提供一种交流换向维弧电路，其连接于交流焊接电源的主电路且包括维弧交流输入、第一电容、整流滤波电路以及输出回路。第一电容串联连接于维弧交流输入的输出端，限制维弧交流输入电路的输出电流。整流滤波电路包括整流器和第二电容，维弧交流输入经第一电容和整流器对第二电容充电。输出回路包括连接于整流滤波电路输出的正接控制开关，所述正接控制开关被配置为将交流换向维弧电路接入或切出主电路的电极正接回路。当主电路从电极负接换向至电极正接时，正接控制开关导通，被充电的第二电容为电极正接回路提供维弧电压和维弧脉冲电流，维弧输入电路向电极正接回路提供维持电流。
根据本发明的一实施例，当主电路从电极负接换向至电极正接时，在换向过零点前开通正接控制开关，预先将交流换向维弧电路接入主电路。
根据本发明的一实施例，辅助变压器基于焊接回路电流参与焊接电源的PI控制，在正接控制开关导通时，辅助变压器的电压以最大状态输出。
根据本发明的一实施例，维弧交流输入为与主电路上的主变压器并联连接于焊接电源一次逆变输出的辅助变压器。
根据本发明的一实施例，交流换向维弧电路还包括连接于整流滤波电路输出端的限流元件，限流元件限制输出的维弧脉冲电流。
根据本发明的一实施例，限流元件为电感，交流换向维弧电还包括连接于电感的放电回路，在正接控制开关关断时，电感的反激电压通过放电回路进行泄放。
根据本发明的一实施例，放电回路为并联于电感两端的续流二极管或并联于电感两端的RC吸收电路。
根据本发明的一实施例，交流换向维弧电路还包括连接于整流滤波电路输出侧的二极管，二极管阻断主电路的电压和电流叠加于交流换向维弧电路。
根据本发明的一实施例，输出回路还包括连接于整流滤波电路的输出的负接控制开关，负接控制开关被配置为将交流换向维弧电路接入或切出主电路的电极负接回路；当主电路从电极正接换向至电极负接时，负接控制开关导通且正接控制开关关闭。
另一方面，本发明还提供一种交流焊接电源，其包括主电路和上述交流换向维弧电路。
根据本发明的一实施例，主电路为半桥逆变电路或全桥逆变电路。
综上所述，本发明提供的交流换向维弧电路在未接入主电路时，维弧交流输入所形成的高频交流电源通过第一电容和整流器为第二电容充电，存储维弧能量。在正接控制开关导通时，被充电的第二电容为电极正接回路提供维弧电压和维弧脉冲电流，为换向后电弧的再引燃提供条件。随着第二电容的放电，维弧交流输入通过第一电容持续向电极正接回路提供一小的维持电流以确保焊接电弧在极性切换过程中的连续性。基于维弧交流输入充电的第二电容，其维弧条件输出不再与主电路上的逆变频率关联，很好地解除了焊接电源逆变频率对容量性容量器件的要求，从而实现高频逆变下第二电容体积的减小。对应的，连接于第二电容输出端的器件的功率也可设置得更小，从而实现高频下器件的小型化设计。基于第一电容所形成的小的维持电流，在第二电容放电后对维弧 能量进行持续补充，不仅进一步减小对第二电容容量的要求，同时也大大提高了维弧的稳定性。此外，采用第一电容经常限流不仅极大地降低了限流所造成的能量损耗，器件容量小且器件发热量也很小。
为让本发明的上述和其它目的、特征和优点能更明显易懂，下文特举较佳实施例，并配合附图，作详细说明如下。
附图说明
图1所示为本发明一实施例提供的交流换向维弧电路的结构示意图。
图2所示为图1所示的交流换向维弧电与半桥二次逆变结构的交流电源的结构示意图。
图3所示为图2中交流换向维弧电路处于充电状态下的电流流向示意图。
图4和图5所示为图2中交流换向维弧电路处于维弧输出状态下的电流流向示意图。
图6所示为图2中主电路输出电流、交流换向维弧电路输出电流以及焊接回路电弧电流三者的时序图。
图7所示为本发明另一实施例提供的交流换向维弧电与半桥二次逆变结构的主电路相连接的结构示意图。
具体实施方式
传统的基于焊接电源主电路的维弧电路，存储在电容上的维弧能量来源于主电路半周期内的充电。当交流逆变频率很高时上一次维弧放电后的电容来不及通过母线充电，导致下一次的维弧能量不够，从而无法满足高频率的焊接需求。为解决这一问题，只能提升电容的容量及对应器件的功率，但这会带来成本、体积以及发热的问题。目前也有一种利用预充电的电容来提升主电路母线换向电压的维弧装置，在该类型的维弧装置中，充电电容仅仅起到提升换向电压作用，其并不向焊接回路输出电流；由于换向时电弧空间的电离度很低，单纯依靠电压的加持再建立电弧还是存在一些困难。
有鉴于此，本实施例提供一种交流换向维弧电路40，其连接于交流焊接电源的主电路30且包括维弧交流输入、第一电容C1、整流滤波电路以及输出回路。第一电容C1串联连接于维弧交流输入的输出端，限制维弧交流输入的输出电流。整流滤波电路包括整流器B1和第二电容C2，维弧交流输入经第一电容C1和整流器B1对第二电容C2充电。输出回路包括连接于整流滤波电路输出的正接控制开关Q3，正接控制开关Q3被配置为将交流换向维弧电路接入或切出主电路30的电极正接回路；当主电路30从电极负接换向至电极正接时，正接控制开关 Q3导通，被充电的第二电容C2为电极正接回路提供维弧电压和维弧脉冲电流，维弧输入电路向电极正接回路提供一维持电流。
相比传统的来源于主电路母线在半周期内充电的维弧电路，本实施例提供的交流换向维弧电路40的维弧能量的提供来源于被维弧输入电路充电的第二电容C2和维弧输入电路经第一电容C1所输出的维持电流。具体而言，在正接控制开关Q3打开时被充电的第二电容C2迅速向电极正接回路提供一足够高的维弧电压和维弧脉冲电流以建立再燃弧条件。随着放电的进行，第二电容C2的电压和电流逐渐降低。此时，维弧输入电路将通过第一电容C1限流后继续为电极正接回路提供一维持电弧稳定的维持电流，以确保电弧能持续燃烧。
本实施例提供的交流换向维弧电路40中的维弧能量的提供完全不依赖于主电路30上的交流逆变频率，从而很好地解除了交流逆变频率对器件容量的限制，第二电容C2的容量无需再随着逆变频率的增高而增大。进一步的，在第二电容C2放电后，维弧输入电路经第一电容C1输出的维持电流的持续补充，大大延长了维弧所需电流的提供时长。这不仅保证了换向电弧再建立后的稳定持续，同时也进一步降低了对第二电容C2的容量要求，从而实现高频逆变电路中第二电容C2的小型化设计。
由于过零换向时第二电容C2需要向电极正接回路提供一足够高的再燃弧电压，约300V左右。因此，要求维弧输入电路要能提供至少300V以上的高压。而对于维弧输入电路输出的维持电流而言，其在满足电弧连续的前提下应尽可能地小，以降低其叠加于主电路输出电流后对主电路上焊接电流特性的影响。因此需要对维持电流进行限制。于本本实施中，维弧输入电路为连接于焊接电源一次逆变20输出的辅助变压器T2。然而，本发明对此不作任何限定。于其它实施例中，维弧输入电路也可为连接于主电路上的主变压器二次侧的辅助变压器；或者外部交流电压源。在图1中，辅助变压器T2输出的交流电流首先经过串联在电路中的第一电容C1，在第一电容C1容抗的阻挡下得到限流后进入整流器B1。相比传统的具有能量损耗的电阻限流，采用无能量损耗的第一电容C1来对交流电流进行阻挡限制，不仅能确保辅助变压器T2的高压输出且器件的发热量更小、体积也将更小。
进一步的，交流换向维弧电路40还包括连接于整流滤波电路输出端的限流元件，限流元件限制第二电容C2放电时输出的维弧脉冲电流。如图1所示，限流元件为电感L1。在换向维弧完成后，正接控制开关Q3关断将交流换向维弧电路40切出主电路30。电感L1的设置使得在正接控制开关Q3关断时，其会产 反激电压并施加于正接控制开关Q3。为避免过高的反激电压损坏正接控制开关Q3，设置交流换向维弧电还包括连接于电感L1的放电回路，在正接控制开关Q3关断时，电感L1的反激电压通过放电回路进行泄放。优选的，如图1所示，放电回路为并联于电感两端的续流二极管D2。然而，本发明对此不作任何限定。于其它实施例中，也可采用并联于电感L1两端的RC吸收电路作为放电回路。或者，当正接控制开关Q3的耐压足够高时，也可不设置放电回路。
在TIG焊中，考虑到钨极是热阴极，铝工件是冷阴极；钨极电子热发射能力强与工件铝。因此，在焊接过程中，钨极接正(DCEP)到钨极接负(DCEN)的极性切换过程要比钨极接负(DCEN)到钨极接正(DCEP)电弧的再引燃要容易的多；换向断弧通常发生在钨极接负(DCEN)到钨极接正(DCEP)的极性切换过程。因此，于本实施例中，输出回路采用正接控制开关Q3来将交流换向维弧电路40接入主回路30的电极正接回路中。然而，本发明对此不作任何限定。
于其它实施例中，如图7所示，输出回路包括正接控制开关Q3，Q4，两者同步导通或关断以将交流换向维弧电路接入或切出主回路的电极正接回路。进一步的，输出回路还包括连接于整流滤波电路的输出的负接控制开关Q5，Q6。负接控制开关Q5，Q6被配置为将交流换向维弧电路接入或切出主电路30的电极负接回路。当主电路30从电极正接换向至电极负接时，负接控制开关Q5，Q6导通且正接控制开关Q3，Q4关闭。辅助变压器T2、第一电容C1、整流器B1以及被充电的第二电容C2将通过负接控制开关Q5，Q6、电感L2以及二极管D3为电极负接回路(即主电路上的开关管Q1导通时的回路)提供维弧电压、维弧脉冲电流以及维持电压，其中二极管D4为并联于电感L2两端的续流二极管。包括正接控制开关Q3，Q4和负接控制开关Q5，Q6的输出回路实现了主电路在两个方向过零换向时的维弧辅助，即可用于半桥二次逆变结构的主电路，也可用于全桥二次逆变结构的主电路。
图2为本实施例提供交流换向维弧电路应用于半桥二次逆变焊接电源的结构示意图，主回路内包含开关管Q1、开关管Q2以及二极管VD1，VD2。开关管Q1、开关管Q2交替导通并分别形成电极负接回路和电极正接回路。以下将结合图3至图6来详细介绍交流换向维弧电路的维弧过程。
在图3中，当主回路开关管Q1导通，开关管Q2截止时，焊接电流从主变压器T1→二极管VD1或二极管VD2→共模电感La→开关管Q1→焊接回路电弧+→焊接回路电弧-→电感DCL→主变压器T1的中心抽头，形成电极负接回路， 如图3中黑色实心箭头所示。于此同时，交流换向维弧电路40内的辅助变压器T2产生与一次逆变20同等高频率的交流电压，第一电容C1串联在辅助变压器T2的输出回路中限制辅助变压器T2的输出电流，交流电压经过整流桥B1整流后存储在第二电容C2中，为维弧装置提供能量。
图4：当主回路30内的开关管Q1截止，开关管Q2导通。交流焊接电源的电流方向开始转换，焊接电流流向：主变压器T1中心抽头→电感DCL→焊接回路电弧-→焊接回路电弧+→开关管Q2→共模电感Lb→二极管VD3或二极管VD4→主变压器T1；形成电极正接回路，如图4中黑色实心箭头所示。在开关管Q1截止；开关管Q2导通的同时正接控制开关Q3导通，由于第二电容C2的电压高于电极正接回路的电压，储存在第二电容C2中的能量通过正接控制开关Q3→电感L1→二极管D1→电感DCL→焊接回路电弧-→焊接回路电弧+→开关管Q2→共模电感Lb→回到第二电容C2；如图4中空心箭头所示。第二电容C2在开关管Q2和正接控制开关Q3导通的瞬间迅速叠加维弧电压和维弧脉冲电流至电极正接回路，为开关管Q2导通时焊接回路电弧的再建立提供条件，确保换向后电弧的连续。随着第二电容C2的放电，存储的能量降低，此时将进入图5的状态。
图5：如空心箭头所示，此时，辅助变压器T2输出的维持电流叠加于第二电容C2的放电电流后输出至电极正接回路内。此时尽管第二电容C2上的存储的能量下降，但辅助变压器T2输出的维持电流将继续提供能量以确保建立的电弧继续燃烧，保持电弧的连续性。由于第二电容C2的放电电流逐渐降低，维持电流的叠加表现在时序图上则为延迟了维护辅助电路输出电流的下降速度，如图6(b)中维弧电流脉冲右侧的倾斜下降速率。
焊接电源电流方向转换完成后，正接控制开关Q3关断，交流换向维弧电路从主回路30中切出，不会对主电路30换向后的半周期内的焊接电压和电流造成影响，主电路内具有很好的电压电流特性。在正接控制开关Q3关断后，辅助变压器T2仍然持续产生与一次逆变20同等高频率的交流电压。第一电容C1串联在辅助变压器T2的输出回路中限制其输出电流大小，交流电压经过整流桥B1整流后存储在第二电容C2中，为下一次维弧提供能量，如图3所示。
图6中，(a)为主回路的输出电流时序图；(b)为交流换向维弧电路的输出电流时序图；(c)焊接回路的电弧电流时序图。从图4中也可以看出交流换向维弧电路在主电路电流换向时输出叠加的维弧脉冲电流和维持电流。在焊接回路 建立足够的电弧电流(表明以再燃弧)后脉冲电流随正接控制开关Q3的关闭而迅速降低至零，从而不再影响主电路。
在图1和2中，在正接控制开关Q3导通时，为避免主电路的电压和电流叠加于交流换向维弧电路，交流换向维弧电路还包括连接于整流滤波电路输出侧的二极管D1，二极管D1确保了电流的单向流通性。
于本实施例中，正接控制开关Q3的导通与开关管Q2同步。然而，本发明对此不作任何限定。于其它实施例中，当主电路从电极负接换向至电极正接(开关Q2开通，开关管Q1关断)时，在换向过零点前开通正接控制开关Q3，预先将交流换向维弧电路40接入主电路30。在过零点前焊接电流仍通过电极负接回路，交流换向维弧电路为焊接回路提供从焊接回路电弧-→焊接回路电弧+的电流，该电流与电极负接回路内的电流反向相反，两者相互抵消，从而加速焊接回路过零前的电流下降速率，更有利于换向后电弧的再引燃。进一步的，预先接入的交流换向维弧电路也可在开关管Q2导通时更迅速地为电极正接回路提供维弧电压和维弧电流脉冲。
为进一步提高维弧效果，于本实施例中，设置辅助变压器T2基于焊接回路电流参与焊接电源的PI控制，在正接控制开关Q3导通时，辅助变压器T2的电压以最大状态输出。具体而言，当正接控制开关Q3导通时，主回路30内焊接回路的电流非常的小；基于这一电流，焊接电源的PI控制系统将增大辅助变压器T2的输出电压，以使其处于最大的状态输出(如300V)。对应的，叠加至电极正接回路的维弧电压也将处于最大值，从而更有利于换向维弧。然而，本发明对此不作任何限定。于其它实施例中，当辅助变压器T2以固定脉宽控制输出的电压足以保证主电路从钨极接负(DCEN)到钨极接正(DCEP)切换时能再引燃电弧，辅助变压器T2也可采用固定脉宽控制。当然，在该控制状态下，辅助变压器T2也始终处于最大的且固定的状态输出。
相对应的，本实施例还提供一种交流焊接电源，如图2所示，该交流焊接电源包括输入整流滤波电路1、一次逆变20、主电路30以及本实施例提供的交流换向维弧电路40且主电路30为半桥逆变电路。
综上所述，本发明提供的交流换向维弧电路在未接入主电路时，维弧交流输入所形成的高频交流电源通过第一电容和整流器为第二电容充电，存储维弧能量。在正接控制开关导通时，被充电的第二电容为电极正接回路提供维弧电压和维弧脉冲电流，为换向后电弧的再引燃提供条件。随着第二电容的放电，维弧交流输入通过第一电容持续向电极正接回路提供一小的维持电流以确保焊 接电弧在极性切换过程中的连续性。基于维弧交流输入充电的第二电容，其维弧条件输出不再与主电路上的逆变频率关联，很好地解除了焊接电源逆变频率对容量性容量器件的要求，从而实现高频逆变下第二电容体积的减小。对应的，连接于第二电容输出端的器件的功率也可设置得更小，从而实现高频下器件的小型化设计。基于第一电容所形成的小的维持电流，在第二电容放电后对维弧能量进行持续补充，不仅进一步减小对第二电容容量的要求，同时也大大提高了维弧的稳定性。此外，采用第一电容经常限流不仅极大地降低了限流所造成的能量损耗，器件容量小且器件发热量也很小。
虽然本发明已由较佳实施例揭露如上，然而并非用以限定本发明，任何熟知此技艺者，在不脱离本发明的精神和范围内，可作些许的更动与润饰，因此本发明的保护范围当视权利要求书所要求保护的范围为准。

Claims (10)

  1. 一种交流换向维弧电路，其特征在于，连接于交流焊接电源的主电路，所述交流换向维弧电路包括：
    维弧交流输入；
    第一电容，串联连接于维弧交流输入的输出端，限制维弧交流输入电路的输出电流；
    整流滤波电路，包括整流器和第二电容，维弧交流输入经第一电容和整流器对第二电容充电；
    输出回路，包括连接于整流滤波电路输出的正接控制开关，所述正接控制开关被配置为将交流换向维弧电路接入或切出主电路的电极正接回路；
    当主电路从电极负接换向至电极正接时，正接控制开关导通，被充电的第二电容为电极正接回路提供维弧电压和维弧脉冲电流，维弧输入电路向电极正接回路提供一维持电流。
  2. 根据权利要求1所述的交流换向维弧电路，其特征在于，当主电路从电极负接换向至电极正接时，在换向过零点前开通正接控制开关，预先将交流换向维弧电路接入主电路。
  3. 根据权利要求1所述的交流换向维弧电路，其特征在于，辅助变压器基于焊接回路电流参与焊接电源的PI控制，在正接控制开关导通时，辅助变压器的电压以最大状态输出。
  4. 根据权利要求1所述的交流换向维弧电路，其特征在于，所述维弧交流输入为与主电路上的主变压器并联连接于焊接电源一次逆变输出的辅助变压器。
  5. 根据权利要求1所述的交流换向维弧电路，其特征在于，所述交流换向维弧电路还包括连接于整流滤波电路输出端的限流元件，所述限流元件限制输出的维弧脉冲电流。
  6. 根据权利要求5所述的交流换向维弧电路，其特征在于，所述限流元件为电感，所述交流换向维弧电还包括连接于电感的放电回路，在正接控制开关关断时，电感的反激电压通过放电回路进行泄放。
  7. 根据权利要求6所述的交流换向维弧电路，其特征在于，所述放电回路为并联于电感两端的续流二极管或并联于电感两端的RC吸收电路。
  8. 根据权利要求1所述的交流换向维弧电路，其特征在于，交流换向维弧电路还包括连接于整流滤波电路输出侧的二极管，所述二极管阻断主电路的电压和电流叠加于交流换向维弧电路。
  9. 根据权利要求1所述的交流换向维弧电路，其特征在于，所述输出回路还包括连接于整流滤波电路的输出的负接控制开关，所述负接控制开关被配置为将交流换向维弧电路接入或切出主电路的电极负接回路；当主电路从电极正接换向至电极负接时，负接控制开关导通且正接控制开关关闭。
  10. 一种交流焊接电源，其特征在于，包括主电路和权利要求1～8任一项所述的交流换向维弧电路。
PCT/CN2022/104303 2021-11-19 2022-07-07 交流换向维弧电路及交流焊接电源 WO2023087743A1 (zh)

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