WO2018220933A1 - アーク加工用電源装置およびアーク加工用電源装置の制御方法 - Google Patents

アーク加工用電源装置およびアーク加工用電源装置の制御方法 Download PDF

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WO2018220933A1
WO2018220933A1 PCT/JP2018/008926 JP2018008926W WO2018220933A1 WO 2018220933 A1 WO2018220933 A1 WO 2018220933A1 JP 2018008926 W JP2018008926 W JP 2018008926W WO 2018220933 A1 WO2018220933 A1 WO 2018220933A1
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Prior art keywords
circuit
welding
inverter
output current
output
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PCT/JP2018/008926
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English (en)
French (fr)
Japanese (ja)
Inventor
善行 濱野
芳行 田畑
徹也 森川
司 三澤
宏太 堀江
Original Assignee
パナソニックＩｐマネジメント株式会社
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Priority to CN201880035401.7A priority Critical patent/CN110679076B/zh
Priority to JP2019521962A priority patent/JP6982744B2/ja
Publication of WO2018220933A1 publication Critical patent/WO2018220933A1/ja

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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
    • H02M7/493—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 the static converters being arranged for operation in parallel
    • 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
    • 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

Definitions

  • This disclosure relates to a technique for providing a plurality of inverter circuits built in an arc machining power supply device in parallel and operating in parallel.
  • a plurality of inverter circuits are provided in parallel to perform parallel operation.
  • the arc machining power supply apparatus provided with a plurality of inverter circuits as described above, especially when the output current is small, it is better to stop some inverter circuits than to drive all inverter circuits. Weldability may be improved.
  • Patent Document 1 In a conventional arc machining power supply device in which a plurality of inverter circuits are provided in parallel, a method is disclosed in which a certain inverter circuit is stopped by detecting a missing tooth in the pulse waveform of the output control signal of the inverter circuit ( Patent Document 1).
  • the power consumption of the entire arc machining power supply device may increase by stopping a certain inverter circuit.
  • the present disclosure provides a technique for controlling the power consumption of the arc machining power supply apparatus to be small in the arc machining power supply apparatus in which a plurality of inverter circuits are provided in parallel.
  • An arc machining power supply apparatus is an arc machining power supply apparatus that performs short-circuit welding or pulse welding on an object to be welded, and is a first 1 that rectifies commercial AC power and outputs a DC voltage.
  • a circuit a first main transformer that converts the output of the first inverter circuit into a high-frequency AC voltage suitable for arc machining, a first secondary rectifier circuit that rectifies the output of the first main transformer, Smoothed by a second primary rectifier circuit that rectifies commercial AC power and outputs a DC voltage, a second smoothing capacitor that smoothes the DC voltage output from the second primary rectifier circuit, and a second smoothing capacitor
  • High frequency AC A second inverter circuit for converting to a voltage; a second main transformer for converting the output of the second inverter circuit to a high-frequency AC voltage suitable for arc machining; and a second for rectifying the output of the second main transformer.
  • An output current detection circuit for detecting the output current; an output current setting circuit for setting a preset value related to a predetermined output current; and a first number that stores in advance a minimum number of inverter circuits that require driving corresponding to the output current Comparing the storage circuit, the set value related to the output current set by the output current setting circuit and the minimum number of inverter circuits that need to be driven corresponding to the output current stored in the first storage circuit, Drive corresponding to the setting Comparison circuit for obtaining the minimum number of necessary inverter circuits, power consumption with respect to temperature, which is the relationship between the temperature of the switching elements constituting the inverter circuit, the inverter output current per inverter circuit to be driven, and the power consumption of the inverter circuit
  • a second storage circuit for storing the relationship in advance,
  • a control method for a power supply device for arc machining in which a plurality of inverter circuits are provided in parallel, and short-circuit welding having a welding start period, a main welding period, and a welding end period is performed on a workpiece.
  • the measured value of the temperature of the switching element constituting the inverter circuit and the time average of the output current output to the work piece The power consumption in the combination of the operation of each inverter circuit is calculated from the average output current, and the driving and stopping of the plurality of inverter circuits are selected so that the total power consumption in each of the plurality of inverter circuits is minimized. To do.
  • a method for controlling a power supply device for arc machining in which a plurality of inverter circuits are provided in parallel and a pulse welding having a welding start period, a main welding period, and a welding end period with respect to an object
  • each inverter circuit is based on the measured value of the temperature of the switching element constituting the inverter circuit and the base current and peak current of the pulse welding.
  • the power consumption in the combination of operations is calculated, and driving and stopping of each of the plurality of inverter circuits are selected so that the total power consumption in the plurality of inverter circuits is minimized.
  • the arc machining power supply device is a large current compatible arc machining power supply device including a plurality of power supply units connected in parallel.
  • Each power supply unit includes a primary rectifier circuit, a smoothing capacitor, an inverter circuit, a main transformer, and a secondary rectifier circuit.
  • the arc machining power supply device measures the temperature of the switching elements constituting each inverter circuit, and based on them, determines whether to drive or stop each inverter circuit so that the power consumption in each inverter circuit is minimized. Therefore, the power consumption of the arc machining power supply device can be reduced.
  • FIG. 1 is an electrical connection diagram of an arc machining power supply device in which two power supply units are provided in parallel.
  • FIG. 2 shows an example of information stored in the first storage circuit in the arc machining power supply apparatus in which two power supply units are provided in parallel, that is, the minimum number of inverter circuits that need to be driven corresponding to the output current. It is a figure which shows an example of the relationship of a number.
  • FIG. 3A shows an example of information stored in the second storage circuit in the arc machining power supply device in which two power supply units are provided in parallel, that is, an example of the relationship of power consumption with respect to temperature.
  • FIG. 3B is a diagram illustrating another example of the relationship of power consumption with respect to temperature.
  • FIG. 4 is a diagram illustrating an example of a calculation result of the calculation circuit in the arc machining power supply device in which two power supply units are provided in parallel.
  • FIG. 5 is a diagram illustrating an example of an output current waveform and an output voltage waveform during short-circuit welding.
  • FIG. 6A is a diagram illustrating the power consumption of the inverter circuit in a normal temperature region with respect to a combination of driving and stopping of each inverter circuit.
  • FIG. 6B is a diagram illustrating the power consumption of the inverter circuit in a high temperature region with respect to a combination of driving and stopping of each inverter circuit.
  • FIG. 7 is a diagram illustrating a calculation result of the calculation circuit.
  • FIG. 8 is a diagram illustrating an example of the relationship between the output current and output voltage during short-circuit welding and the number of inverter circuits to be driven.
  • FIG. 9 is a diagram illustrating an example of the relationship between the output current and output voltage during short-circuit welding and the number of inverter circuits to be driven.
  • FIG. 10 is a diagram illustrating an example of an output current waveform and an output voltage waveform during pulse welding.
  • FIG. 11 is a diagram illustrating an example of the relationship between the output current and the output voltage during pulse welding and the number of inverter circuits to be driven.
  • FIG. 1 shows an arc machining power supply device in which two power supply units formed of a primary rectifier circuit, a smoothing capacitor, an inverter circuit, a main transformer, and a secondary rectifier circuit are provided in parallel.
  • a DC power supply circuit is formed by the first primary rectifier circuit DR11 that rectifies AC power from the commercial AC power supply AC and outputs a DC voltage, and the first smoothing capacitor C1 that smoothes the DC voltage.
  • the second primary rectifier circuit DR12 and the second smoothing capacitor C2 are provided in parallel with the first primary rectifier circuit DR11, and smooth the DC voltage with the first primary rectifier circuit DR11, respectively. The same operation as that of the first smoothing capacitor C1 is performed.
  • the first inverter circuit INV1 is formed by a switching element such as an IGBT or a MOSFET.
  • the first inverter circuit INV1 converts the DC voltage output by the first primary rectifier circuit DR11 into a high-frequency AC voltage and outputs it.
  • the second inverter circuit INV2 converts the DC voltage output by the second primary rectifier circuit DR12 into a high-frequency AC voltage and outputs it.
  • the first main transformer MTR1 converts the high-frequency AC voltage output from the first inverter circuit INV1 into a high-frequency AC voltage suitable for arc machining.
  • the first secondary rectifier circuit DR21 rectifies the output of the first main transformer MTR1 and outputs a direct current.
  • the second main transformer MTR2 converts the high-frequency AC voltage output from the second inverter circuit INV2 into a high-frequency AC voltage suitable for arc machining.
  • the second secondary rectifier circuit DR22 rectifies the output of the second main transformer MTR2 and outputs a direct current.
  • the DC reactor DCL smoothes a DC current that is a combination of the DC current output from the first secondary rectifier circuit DR21 and the DC current output from the second secondary rectifier circuit DR22.
  • An electric wire that can be electrically connected by an operator is attached between the output terminal OT and the torch TH and between the output terminal OT and the workpiece M.
  • the output terminal OT supplies a direct current smoothed by the direct current reactor DCL between the torch TH and the workpiece M as a welding current.
  • the output current detection circuit CT detects an output current as a welding current, and outputs an output current detection signal Io indicating the detected output current.
  • the output current is a direct current obtained by adding the direct current output from the first secondary rectifier circuit DR21 and the direct current output from the second secondary rectifier circuit DR22.
  • the output current setting circuit IS outputs a set value related to the output current that is adjusted in advance by the operator as the output current setting signal Is.
  • the first storage circuit MC1 stores in advance the relationship between the minimum number of inverter circuits that need to be driven at the minimum with respect to the output current.
  • the inverter circuits are the first inverter circuit INV1 and the second inverter circuit INV2.
  • the first memory circuit MC1 outputs this stored relationship as the first memory signal Mc1.
  • the first memory circuit MC1 stores the relationship of the minimum number of inverter circuits that need to be driven corresponding to the output current.
  • the output current has a current value less than the output current threshold Ith, at least one inverter circuit needs to be driven.
  • the output current has a current value equal to or greater than the output current threshold Ith, it is necessary to drive at least two inverter circuits.
  • the comparison circuit CC shown in FIG. 1 compares the output current setting signal Is and the first storage signal Mc1, and outputs the minimum number of inverter circuits that need to be driven as the comparison signal Cc.
  • the second storage circuit MC2 stores the relationship of the power consumption of the inverter circuit with respect to the temperature, and outputs this relationship as the second storage signal Mc2. More specifically, this relationship is the relationship between the inverter output current per inverter circuit to be driven and the power consumption of the inverter circuit with respect to the temperature of the switching elements constituting the inverter circuit.
  • the second memory circuit MC2 stores the relationship between the inverter output current per inverter circuit to be driven with respect to the temperature and the power consumption of the inverter circuit as shown in FIG. 3A. As is apparent from the figure, if the output current per one inverter circuit to be driven increases, the power consumption of the inverter circuit tends to increase.
  • the slope of power consumption with respect to the inverter output current per inverter circuit to be driven increases as compared with a normal temperature of 5 to 35 ° C.
  • the slope of power consumption with respect to the inverter output current per inverter circuit to be driven may decrease as compared with normal temperature.
  • the relationship of the power consumption of the inverter circuit with respect to the temperature stored in the second memory circuit MC2 is determined from the specifications of the switching elements (IGBT and MOSFET) constituting the first inverter circuit INV1 and the second inverter circuit INV2. it can.
  • the first measured temperature value T1 shown in FIG. 1 is a measured temperature value of the switching elements constituting the first inverter circuit INV1.
  • the second temperature measurement value T2 is a temperature measurement value of the switching element that constitutes the second inverter circuit INV2.
  • the temperature of these switching elements is measured by a thermistor (not shown).
  • the arithmetic circuit OC calculates the total power consumption of all inverter circuits for the combination of driving and stopping of each inverter circuit. This total power consumption is obtained based on the first temperature measurement value T1, the second temperature measurement value T2, and the second storage signal Mc2.
  • the arithmetic circuit OC outputs the calculation result as the calculation signal Oc.
  • the calculation result of the power consumption in the combination of each inverter circuit by the arithmetic circuit OC is as shown in FIG. There are three combinations of driving and stopping of the first inverter circuit INV1 and the second inverter circuit INV2 (except when both are stopped).
  • the arithmetic circuit OC calculates power consumption values W21, W22, and W43 (W31 + W32) that are the total power consumption Ww3 in each case.
  • the power consumption value W21 is the total power consumption when the first inverter circuit INV1 is driven and the second inverter circuit INV2 is stopped, that is, when only one first inverter circuit INV1 is driven. This is the total power consumption value.
  • the power consumption value W22 is the total power consumption when the first inverter circuit INV1 is stopped and the second inverter circuit INV2 is driven, that is, when only one second inverter circuit INV2 is driven. This is the total power consumption value.
  • the power consumption value W43 is a value of the total power consumption when the two inverter circuits are driven and the first inverter circuit INV1 and the second inverter circuit INV2 are driven together, that is, the first inverter circuit. This is the sum of the power consumption value W31 of INV1 and the power consumption value W32 of the second inverter circuit INV2.
  • the selection circuit SC shown in FIG. 1 selects the combination that minimizes the total power consumption of the first inverter circuit INV1 and the second inverter circuit INV2 among the combinations of the minimum number of inverter circuits that need to be driven. To do. This selection result is obtained based on the comparison signal Cc and the calculation signal Oc.
  • the selection circuit SC outputs a selection result related to driving or stopping of each inverter circuit as a selection signal Sc.
  • the output control circuit OCC controls the output of the inverter circuit whose drive is selected by the selection signal Sc so that the output current detection signal Io becomes equal to the output current setting signal Is.
  • the output control circuit OCC further controls the output of the inverter circuit whose stop is selected by the selection signal Sc to be zero.
  • the output control circuit OCC outputs a first output control signal Occ1 for controlling the output of the first inverter circuit INV1 and a second output control signal Occ2 for controlling the output of the second inverter circuit INV2. .
  • the first inverter drive circuit SD1 outputs a first inverter drive signal Sd1 for driving the first inverter circuit INV1 according to the first output control signal Occ1.
  • the second inverter drive circuit SD2 outputs a second inverter drive signal Sd2 for driving the second inverter circuit INV2 according to the second output control signal Occ2.
  • the first memory circuit MC1 stores the relationship of the minimum number of inverter circuits that need to be driven with respect to the output current shown in FIG.
  • the second memory circuit MC2 stores the relationship between the temperature of the switching element constituting the inverter circuit shown in FIG. 3A, the inverter output current per one inverter circuit to be driven, and the power consumption of the inverter circuit.
  • the short-circuit welding includes a welding start period Th, a main welding period Tw, and a welding end period Te.
  • the main welding period is a period in which the short circuit period Ts in the short circuit state and the arc period Ta in the arc state are repeated.
  • the first inverter circuit INV1 and the second inverter circuit INV2 are configured by the same switching element.
  • the same switching element has the same model, in other words, a switching element having the same performance.
  • FIG. 5 shows an output current waveform and an output voltage waveform during short-circuit welding.
  • the main welding period Tw is a period during which welding is performed by moving the torch TH in accordance with a location (welding line) where the workpiece M is desired to be welded.
  • the average output current Iw is a time average of the output current supplied between the welding wire and the workpiece M in the main welding period Tw, in other words, output to the workpiece M.
  • the average output current Iw corresponds to a set current as a set value of the output current in the main welding period Tw.
  • the welding start period Th is a period during which a process for making it easy to start welding by outputting a start current Ih higher than the average output current Iw of the main welding period Tw for a certain period of time.
  • the welding end period Te is a period during which a terminal current Ie lower than the average output current Iw of the main welding period Tw is output for a certain period of time to prevent the welding wire and the workpiece M from sticking to each other. Basically, an operator adjusts the average output current Iw in the main welding period Tw and performs welding suitable for the workpiece M.
  • the main welding period Tw of the short circuit welding includes the short circuit period Ts and the arc period Ta.
  • the short circuit period Ts is a short circuit period in which the welding wire and the workpiece M are in electrical contact (short circuit).
  • the arc period Ta is an arc state period in which a short circuit is opened and an arc is generated. As shown in FIG. 5, the output voltage is low in the short circuit period Ts. On the other hand, in the arc period Ta, the output voltage increases and the output current decreases from a high current value.
  • the output power in the main welding period in the short-circuit welding is constant to some extent although there is some variation if the set value of the average output current Iw is constant.
  • the value of the average output current Iw set by the operator can be handled as the set value of the output current setting signal Is.
  • the comparison signal Cc indicates driving of two inverter circuits.
  • the comparison signal Cc indicates driving of at least one inverter circuit. In this case, the minimum number of inverter circuits driven by the first temperature measurement value T1 and the second temperature measurement value T2 changes.
  • FIG. 3A shows the characteristics of the switching element of the inverter circuit in which the slope of increase in power consumption is smaller in the normal temperature region than in the high temperature region. If the output current per inverter circuit increases, the power consumption of the inverter circuit tends to increase. In addition, the slope of increase in power consumption is smaller in the normal temperature region than in the high temperature region. In the normal temperature region, even if the output current per one inverter circuit to be driven increases, the rate of increase in power consumption is small.
  • the high temperature region is a temperature that is higher than the normal temperature region and that does not break the switching elements of the inverter circuit, and is, for example, a temperature of 80 to 90 ° C.
  • the normal temperature region is, for example, a temperature of 5 to 35 ° C.
  • the first temperature measurement value T1 and the second temperature measurement value T2 are substantially the same before the start of welding in a room temperature region where the inverter circuit of the arc machining power supply device is sufficiently cooled.
  • the relationship between the inverter output current and the power consumption of the inverter circuit is, for example, as shown in FIG. 6A. Since the temperature of the inverter circuit is in the normal temperature range, the inclination of the increase in power consumption of the inverter circuit with respect to the increase in inverter output current per inverter circuit to be driven is small.
  • the arithmetic circuit OC calculates the total power consumption Ww3 for each combination of driving and stopping of the first inverter circuit INV1 and the second inverter circuit INV2. Specifically, the arithmetic circuit OC calculates the power consumption values Ww11, Ww12, and Ww33 (Ww21 + Ww22) as the total power consumption Ww3.
  • the inverter output current when driving either one of the first inverter circuit INV1 or the second inverter circuit INV2 and supplying the average output current Iw to the output terminal OT is defined as an inverter output current I1. Further, the inverter output current per inverter circuit when the two inverter circuits of the first inverter circuit INV1 and the second inverter circuit INV2 are driven together to supply the average output current Iw to the output terminal OT is obtained. It is assumed that the inverter output current I2. Here, there is a relationship that the inverter output current I1 is larger than the inverter output current I2. When driving two inverter circuits together, the output of each inverter circuit is the same. In other words, the inverter output current I1 has a relationship of about twice the inverter output current I2.
  • the power consumption value Ww11 is the total power consumption when the first inverter circuit INV1 is driven and the second inverter circuit INV2 is stopped, that is, the total when only one first inverter circuit INV1 is driven. This is the power consumption value.
  • the power consumption value Ww12 is the total power consumption when the first inverter circuit INV1 is stopped and the second inverter circuit INV2 is driven, that is, when only one second inverter circuit INV2 is driven. Is the value of the total power consumption.
  • the inverter output current per inverter circuit when driving with the power consumption value Ww11 and the power consumption value Ww12 is the inverter output current I1.
  • the power consumption value Ww33 is a power consumption value that is the sum of the power consumption values of the inverter circuits when both of the inverter circuits are driven. That is, the consumption of the sum of the power consumption value Ww21 of the first inverter circuit INV1 and the power consumption value Ww22 of the second inverter circuit INV2 when both the first inverter circuit INV1 and the second inverter circuit INV2 are driven. This is the power value.
  • the inverter output current per inverter circuit when driving with the power consumption value Ww21 and the power consumption value Ww22 is the inverter output current I2.
  • the power consumption value Ww11 of the first inverter circuit INV1 is the power consumption value of the first inverter circuit INV1 when the current of the average output current Iw is supplied to the output terminal OT only by the first inverter circuit INV1.
  • the power consumption value Ww12 of the second inverter circuit INV2 is the power consumption value of the second inverter circuit INV2 when the current of the average output current Iw is supplied to the output terminal OT only by the second inverter circuit INV2. Note that, under the above-described conditions, the power consumption value Ww11 of the first inverter circuit INV1 and the power consumption value Ww12 of the second inverter circuit INV2 are substantially equal.
  • the inverter output current I2 is an inverter output current per inverter circuit when the two inverter circuits are driven together to supply the average output current Iw to the output terminal OT.
  • the power consumption value Ww21 of the first inverter circuit INV1 is the same as that when the average output current Iw is supplied to the output terminal OT by two inverter circuits including the first inverter circuit INV1 and the second inverter circuit INV2. 1 is a value of power consumption of one inverter circuit INV1.
  • the power consumption value Ww22 of the second inverter circuit INV2 is obtained when the current of the average output current Iw is supplied to the output terminal OT by the two inverter circuits including the first inverter circuit INV1 and the second inverter circuit INV2. This is the power consumption value of the second inverter circuit INV2. Note that, under the above-described conditions, the power consumption value Ww21 of the first inverter circuit INV1 and the power consumption value Ww22 of the second inverter circuit INV2 are substantially equal.
  • the power consumption value Ww33 is the sum of the two inverter circuits when the current of the average output current Iw is supplied to the output terminal OT by the two inverter circuits including the first inverter circuit INV1 and the second inverter circuit INV2. Power consumption. The value is the sum of the power consumption value Ww21 of the first inverter circuit INV1 and the power consumption value Ww22 of the second inverter circuit INV2.
  • the total power consumption Ww3 of the calculation result of the calculation circuit OC for the combination of driving and stopping of each inverter circuit is as shown in FIG.
  • the power consumption of the inverter circuit in the normal temperature region where the temperature of the switching element is low is as shown in FIG. 6A.
  • a combination of operation of the inverter circuit that reduces the power consumption of the inverter circuit during short-circuit welding is as follows.
  • the power consumption value Ww33 is larger than the power consumption value Ww11 and larger than the power consumption value Ww12.
  • the selection circuit SC selects one inverter circuit in the room temperature region so that the power consumption of the arc machining power supply device is reduced, and the selection signal Sc for supplying the average output current Iw to the output terminal OT. Is output.
  • the first temperature measurement value T1 and the second temperature measurement value T2 are substantially equal. Therefore, when any one inverter circuit is driven alone, the power consumption value Ww11 of the first inverter circuit INV1 and the power consumption value Ww12 of the second inverter circuit INV2 are substantially equal. However, the selection signal Sc is actually output so as to drive the smaller inverter circuit.
  • the relationship between the inverter output current and output voltage during short-circuit welding and the number of inverter circuits to be driven is as shown in FIG.
  • Tw and the welding end period Te one inverter circuit is driven.
  • the welding start period Th the inverter output current becomes larger than the output current threshold value Ith, so that two inverter circuits are driven.
  • the temperature of the switching elements constituting the first inverter circuit INV1 and the second inverter circuit INV2 rises in the same manner, and becomes a high temperature region.
  • the temperature of the switching element rises and becomes a high temperature region, the increasing slope of power consumption with respect to the output current per driven inverter circuit increases, in other words, the increase rate increases.
  • the temperature of the switching element of the inverter circuit becomes a high temperature region, and the relationship between the inverter output current per inverter circuit to be driven and the power consumption of the inverter circuit is higher than that in the normal temperature region as shown in FIG. 3A.
  • the increase slope of power consumption becomes larger in the region.
  • the relationship between the inverter output current of each inverter circuit in the high temperature region and the power consumption of the inverter circuit is as shown in FIG. 6B.
  • the power consumption value when one of the first inverter circuit INV1 and the second inverter circuit INV2 is driven is the power consumption value (Ww11, Ww12).
  • the power consumption value that is the sum of the power consumption values (Ww21, Ww22) when the two inverter circuits are both driven is defined as a power consumption value Ww33.
  • the increase slope of the power consumption of the inverter circuit with respect to the inverter output current per one inverter circuit to be driven is larger than the relationship in the normal temperature region shown in FIG. 6A.
  • the total power consumption Ww3 of the calculation result of the calculation circuit OC for the combination of driving and stopping of each inverter circuit is as shown in FIG.
  • the inverter circuit combination itself does not change from the normal temperature region before the temperature rises.
  • the power consumption of the inverter circuit in the high temperature region where the temperature of the switching element is high is in the relationship shown in FIG. 6B, for example, the following combinations of operation of the inverter circuit that reduce the power consumption of the inverter circuit during short-circuit welding It becomes like.
  • the power consumption value Ww33 is smaller than the power consumption value Ww11 or the power consumption value Ww12.
  • the selection circuit SC outputs the selection signal Sc for driving the two inverter circuits together and supplying the average output current Iw to the output terminal OT so that the power consumption of the arc machining power supply device is reduced. To do.
  • the arc machining power supply device of the present embodiment includes a plurality of inverter circuits (INV1, INV2) provided in parallel, and performs short-circuit welding on the workpiece M.
  • the short-circuit welding has a welding start period Th, a main welding period Tw, and a welding end period Te.
  • the arc machining power supply apparatus outputs the measured temperature values (T1, T2) of the switching elements constituting the inverter circuit (INV1, INV2) and the workpiece M to be welded.
  • the arc machining power supply device selects driving and stopping of each of the plurality of inverter circuits so that the total power consumption Ww3, which is the total power consumption of the plurality of inverter circuits (INV1, INV2), is minimized.
  • Embodiment 2 Next, Embodiment 2 of the present disclosure will be described with reference to FIGS. 1 to 3A and FIGS. 10 to 11.
  • the configuration of the arc machining power supply device of the second embodiment is the same as that of the first embodiment.
  • the first memory circuit MC1 stores the relationship of the minimum number of inverter circuits that need to be driven with respect to the inverter output current shown in FIG.
  • the second memory circuit MC2 stores the relationship between the temperature of the switching elements constituting the inverter circuit shown in FIG. 3A, the inverter output current per one inverter circuit to be driven, and the power consumption of the inverter circuit.
  • the first inverter circuit INV1 and the second inverter circuit INV2 are composed of the same switching element. The operation of pulse welding will be described with reference to FIGS.
  • Pulse welding includes a main welding period in which a base period Tb and a peak period Tp are repeated.
  • the arc machining power supply device outputs a base current Ib having a low output current value in the base period Tb, and outputs a peak current Ip having a high output current value in the peak period Tp.
  • FIG. 10 shows an output current waveform and an output voltage waveform during pulse welding.
  • the output current waveform and the output voltage waveform at the time of short-circuit welding shown in FIG. 5 having the same reference sign represent the same meaning, and therefore description thereof will be omitted, and only the parts having different reference numerals will be described.
  • a base period Tb with a low output current value and a peak period Tp with a high output current value regularly and alternately exist in the main welding period Tw.
  • the base current Ib represents the output current value in the base period Tb
  • the peak current Ip represents the output current value in the peak period Tp.
  • the arc machining power supply apparatus performs a certain calculation based on the average output current Iw set by the operator, and determines the base current Ib and the peak current Ip.
  • the operator can directly adjust the base current Ib and the peak current Ip.
  • Pulse welding has less contact (short circuit) between the welding wire and the workpiece M than short circuit welding.
  • both the output current and the output voltage are low, and in the peak period Tp, both the output current and the output voltage are high. For this reason, a small amount of power can be used in the base period Tb, but a large amount of power is required in the peak period Tp.
  • the output power varies greatly during the main welding period.
  • the value of the base current Ib is handled as the set value of the output current setting signal Is in the base period Tb, and the value of the peak current Ip is set to the value of the output current setting signal Is in the peak period Tp. Treated as a setting value.
  • the relationship between the output current threshold Ith, the base current Ib, and the peak current Ip of pulse welding stored in the first memory circuit MC1 is as shown in FIGS.
  • the comparison signal Cc indicates driving of two inverter circuits. Therefore, the arc machining power supply device drives the two inverter circuits to output the peak current Ip.
  • the comparison signal Cc indicates driving of at least one inverter circuit.
  • the first inverter circuit INV1 and the second temperature are determined by the relationship between the temperature based on the first temperature measurement value T1 and the second temperature measurement value T2 and the power consumption with respect to this temperature. Driving or stopping of the inverter circuit INV2 is selected.
  • the arc machining power supply device drives one or two inverter circuits to output a base current Ib.
  • FIG. 1 An example of the relationship between the output current and output voltage in pulse welding and the number of inverter circuits to be driven will be specifically described with reference to FIG.
  • the figure shows an example in which one inverter is driven in the first to third base periods Tb and two inverters are driven in the fourth base period Tb.
  • the temperature of the switching elements constituting the inverter circuit increases.
  • the total power consumption may be smaller when two inverter circuits are driven than when one inverter circuit is driven.
  • the arithmetic circuit OC determines that driving one inverter circuit can reduce power consumption compared to driving two inverter circuits. . For this reason, the selection circuit SC selects driving of one inverter circuit. In contrast, in the fourth base period Tb, the arithmetic circuit OC determines that the power consumption is smaller when driven by two inverter circuits than when driven by one inverter circuit. Therefore, the selection circuit SC selects driving of the two inverter circuits.
  • the arc machining power supply device includes a plurality of inverter circuits provided in parallel and performs pulse welding on the workpiece M.
  • Pulse welding has a welding start period Th, a main welding period Tw, and a welding end period Te.
  • the power supply device for arc machining uses the measured temperature values (T1, T2) of the switching elements constituting the inverter circuit (INV1, INV2), the base current and the peak current of the pulse welding, respectively.
  • the power consumption in the combination of driving and stopping operations of the inverter circuits (INV1, INV2) is calculated.
  • the arc machining power supply device selects driving and stopping of each of the plurality of inverter circuits so that the total power consumption in the plurality of inverter circuits (INV1, INV2) is minimized.
  • the power consumption of the inverter circuits (INV1, INV2) constituting the arc machining power supply device during the main welding period Tw of the pulse welding can be reduced.
  • Embodiment 3 of the present disclosure will be described with reference to FIGS. 1 to 3A, FIG. 5, and FIGS. 8 to 11.
  • the configuration of the arc machining power supply device of the third embodiment is the same as that of the first embodiment.
  • the first memory circuit MC1 stores the relationship of the minimum number of inverter circuits that need to be driven with respect to the output current as shown in FIG.
  • the second memory circuit MC2 stores the relationship between the temperature of the switching element constituting the inverter circuit as shown in FIG. 3A, the inverter output current per one inverter circuit to be driven, and the power consumption of the inverter circuit.
  • the first inverter circuit INV1 and the second inverter circuit INV2 are composed of the same switching element. The operation in the welding start period will be described with reference to FIGS.
  • a start current Ih higher than the average output current Iw in the main welding period is output for a certain period of time. To make it easier to start.
  • the arc machining power supply device performs a predetermined calculation on the basis of the average output current Iw set by the operator to determine the start current Ih.
  • the operator can directly adjust the starting current Ih.
  • the value of the start current Ih is treated as the set value of the output current setting signal Is.
  • the comparison signal Cc indicates driving of two inverter circuits. Therefore, as shown in FIGS. 8, 9, and 11, the arc machining power supply device drives two inverter circuits to output a start current Ih.
  • the temperature measurement values (T1, T2) of the switching elements constituting the inverter circuit (INV1, INV2) and the main welding period Tw are used for the welding start period Th.
  • the power consumption in each inverter circuit (INV1, INV2) is calculated from the constant start current Ih.
  • the arc machining power supply device selects driving and stopping of the inverter circuits (INV1, INV2) so that the total power consumption Ww3, which is the total power consumption of the plurality of inverter circuits, is minimized.
  • the constant start current Ih may be higher than the average output current Iw.
  • start current Ih used to calculate the power consumption in the inverter circuits is a constant start current Ih, but may be an average start current Ihw.
  • the average start current Ihw is a current obtained by averaging the output current in the welding start period Th.
  • the average start current Ihw may be higher than the average output current Iw.
  • the configuration of the arc machining power supply device of the fourth embodiment is the same as that of the first embodiment.
  • the first memory circuit MC1 stores the relationship of the minimum number of inverter circuits that need to be driven with respect to the output current as shown in FIG.
  • the second memory circuit MC2 stores the relationship among the temperature of the switching elements constituting the inverter circuit as shown in FIG. 3A, the output current per inverter circuit, and the power consumption of the inverter circuit.
  • the first inverter circuit INV1 and the second inverter circuit INV2 are composed of the same switching element. The operation in the welding end period will be described with reference to FIGS. 5, 10, and 11.
  • the arc machining power supply device performs a predetermined calculation on the basis of the average output current Iw set by the operator to determine the termination current Ie.
  • the operator can also adjust the termination current Ie directly.
  • the value of the termination current Ie is treated as the set value of the output current setting signal Is.
  • the comparison signal Cc indicates driving of at least one inverter circuit.
  • the arc machining power supply device uses the first temperature measurement value T1 and the second temperature measurement value T2 based on the relationship between the temperature of the inverter circuit and the power consumption. The driving or stopping of INV1 and the second inverter circuit INV2 is selected. The arc machining power supply device drives the selected inverter circuit to output the termination current Ie. 8 and 11 show examples in which the termination current Ie is output by one inverter circuit.
  • FIG. 9 shows an example in which the termination current Ie is output by two inverter circuits.
  • the temperature measurement values (T1, T2) of the switching elements constituting the inverter circuits (INV1, INV2) and the constant termination current Ie are calculated from the above.
  • the arc machining power supply device selects driving and stopping of each of the plurality of inverter circuits so that the total power consumption Ww3, which is the total power consumption of the plurality of inverter circuits (INV1, INV2), is minimized.
  • the constant termination current Ie may be lower than the average output current Iw.
  • the termination current Ie used for calculating the power consumption in the inverter circuits is a constant termination current Ie lower than the average output current Iw, but the average termination current Ie is lower than the average output current Iw. It may be Iew.
  • This average terminal current Iew is a current obtained by averaging the output current in the welding end period Te. The average termination current Iew may be lower than the average output current Iw.
  • the technology of the present disclosure reduces power consumption by setting an appropriate output current setting signal Is in advance depending on the welding method and the welding period. Can be planned. Further, depending on any combination of the first to fourth embodiments, the power consumption can be reduced in the entire welding period including the welding start period, the main start period, and the welding end period.
  • a plurality of inverter circuits are driven or stopped according to a measured value of a temperature of a switching element constituting the inverter circuit and a set value related to an output current, and power consumption in the inverter circuit is reduced. Since it can be selected, it is industrially useful.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding Control (AREA)
  • Inverter Devices (AREA)
  • Generation Of Surge Voltage And Current (AREA)
PCT/JP2018/008926 2017-05-29 2018-03-08 アーク加工用電源装置およびアーク加工用電源装置の制御方法 WO2018220933A1 (ja)

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