JP2000015444A - Arc loading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust an arc voltage setting value with an arc voltage setting device by inputting a difference between output signals of a voltage detector connected between output terminals of an arc working power source and output signals of an arc voltage setting device and connecting an analog element between output terminals of an arc working power source wherein a conducting quantity varies in proportion to the input. SOLUTION: A conducting quantity of a transistor 13 varies until output signals Vr of an arc voltage setting device 14 become equal to output signals Vf of a voltage detector 10. Therefore, when a setting value of the arc voltage setting device 14 is risen, a base current of the transistor 13 becomes small, the conducting quantity is reduced and an output current from a DC arc working power source 1 is lowered. Consequently, a voltage between output terminals Tm1 and Tm2 rises and an arc voltage rises based on an output voltage and current characteristic of the DC arc working power source 1. To the contrary, when the setting value of the arc voltage setting device is dropped, the arc voltage drops.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an arc load device connected to an output terminal of a power supply device for arc processing and used to measure output characteristics of the power supply device by simulating an arc voltage. .

[0002]

2. Description of the Related Art FIG. 12 is a view showing a general state in which an arc is generated. An arc processing electrode 2 and a workpiece 3 are connected to output terminals Tm1 and Tm2 of a DC arc processing power supply device 1, respectively. Then, an arc 4 is generated during that time. When performing a characteristic test of the power supply device for DC arc machining, a voltage drop Va equivalent to an arc voltage is generated in a pseudo manner, and the voltage is changed to perform a characteristic test. The voltage-current characteristics of the arc discharge used for arc machining are almost constant voltage characteristics.
3 or FIG. 14 is used. FIG.
In 3, the number of the diodes 5 is adjusted by using the characteristic that the forward voltage-current characteristics of the diode 5 is almost constant voltage, and a voltage drop equivalent to a pseudo arc voltage is generated. In FIG. 14, the number of batteries 6 is adjusted to generate a voltage drop corresponding to a pseudo arc voltage.

[0003]

In the conventional apparatus shown in FIGS. 13 and 14, the only way to adjust the pseudo arc voltage is to change the number of diodes 5 or batteries 6. Cannot be changed continuously. Further, in order to change the arc voltage, it is necessary to change the number of connected diodes 5 or batteries 6 each time, and cannot be changed by an external signal. For this reason, there is a problem that it is difficult to adjust the arc voltage.

[0004]

An arc load device according to the present invention is connected to an output terminal of an arc machining power supply device having a drooping characteristic or a constant current characteristic to measure an output characteristic of the arc machining power supply device. A voltage detector connected between output terminals of a power supply device for arc processing, an arc voltage setting device for setting an arc voltage, an output signal (Vf) of the voltage detector, and an arc load device. Difference from output signal (Vr) of voltage setting device (ΔV = Vf−Vr)
And an analog element connected between the output terminals of the power supply device for arc processing in which the amount of conduction changes in proportion to the input.

An arc load device according to a second aspect of the present invention is connected to an output terminal of an arc processing power supply device having a drooping characteristic or a constant current characteristic, and is used for measuring the output characteristics of the arc processing power supply device. In the apparatus, a capacitor connected between output terminals of a power supply device for arc processing, a voltage detector connected to both terminals of the capacitor, an arc voltage setting device for setting an arc voltage, and an output signal of the voltage detector (Vf) and the output signal (V
r) (ΔV = Vf−Vr) as an input, a pulse generator for generating a pulse having a conduction time ratio proportional to the input at a predetermined frequency, and an output pulse of a pulse generator connected in parallel with a capacitor. An arc load device having a switching element whose conduction is controlled is proposed.

An arc load device according to a third aspect of the present invention is connected to an output terminal of a power supply device for AC arc machining having drooping characteristics or constant current characteristics, and is used when measuring the output characteristics of the power supply device for AC arc machining. In the arc load device, a first re-ignition voltage setting circuit for setting a re-ignition voltage by using a positive half-wave of an output voltage of an output of the power supply device for AC arc processing as an input, and a first re-ignition voltage setting circuit A first voltage detector connected between the output terminals, a second re-ignition voltage setting circuit for setting a re-ignition voltage by using a negative half-wave of the output voltage of the AC arc machining power supply as an input, 2 A second voltage detector connected between the output terminals of the re-ignition voltage setting circuit, an arc voltage setter for setting an arc voltage, an output signal (Vfa) of the first voltage detector, and an arc voltage setter (ΔV) from the output signal (Vr) = A first analog device conduction amount Vfa-Vr) proportional to an input entered a is connected between the output terminal of the first reignition voltage setting circuit for changing the second
Second re-ignition voltage setting in which the difference (ΔVb = Vfb−Vr) between the output signal (Vfb) of the voltage detector and the output signal (Vr) of the arc voltage setting device is input and the conduction amount changes in proportion to the input. An arc load device comprising a second analog element connected between output terminals of a circuit is proposed.

The arc load device according to the present invention is connected to an output terminal of a power supply device for AC arc machining having a drooping characteristic or a constant current characteristic, and is used for measuring the output characteristics of the power supply device for AC arc processing. In the arc load device, a first re-ignition voltage setting circuit for setting a re-ignition voltage by inputting a positive half wave of the output voltage of the power supply device for AC arc machining, and an output terminal of the first re-ignition voltage setting circuit A first capacitor connected to both terminals of the first capacitor, a first voltage detector connected to both terminals of the first capacitor, and a negative half-wave of the output voltage of the power supply device for AC arc machining as an input to generate a re-ignition voltage. A second re-ignition voltage setting circuit to be set, a second capacitor connected between output terminals of the second re-ignition voltage setting circuit, and a second voltage detector connected to both terminals of the second capacitor. Set the arc voltage A voltage setter, the output signal of the first voltage detector (Vfa) and arc voltage setting unit of the output signal (V
r) (ΔV = Vfa−Vr) and a first pulse generator that generates a pulse having a conduction time ratio proportional to the input at a predetermined frequency, and a first pulse connected in parallel with the first capacitor The first switching element, which is controlled to be conductive by the output pulse of the generator, and the difference (ΔV = Vfb−Vr) between the output signal (Vfb) of the second voltage detector and the output signal (Vr) of the arc voltage setter are input. A second pulse generator for generating a pulse having a conduction time ratio proportional to the input at a predetermined frequency, and a second switching element controlled to be conductive by an output pulse of the second pulse generator connected in parallel with the second capacitor And an arc load device having the following.

According to a fifth aspect of the present invention, there is provided an arc load device comprising, as an arc voltage setting device, a current detector for detecting an output current of a power supply device for arc processing, and a current detector between an end of an electrode for arc processing and a workpiece. An electrode distance setting device for setting a voltage corresponding to the distance, and an output signal (If) of the current detector and an output signal (S1) of the electrode distance setting device are input to calculate a voltage value corresponding to an arc voltage and to perform an arc. The voltage setting signal ｛Vr = A + B × If + (C + D × If) × S1 wherein A, B, C and D are arc voltage calculation circuits for outputting a constant｝. Has been proposed.

According to a sixth aspect of the present invention, in the arc load device, a first current detector for detecting a positive half-wave of an output current of the power supply device for AC arc processing is provided as an arc voltage setting device, and a power supply device for AC arc processing. To detect the negative half-wave of the output current of
A current detector, an electrode distance setting device that sets a voltage corresponding to a distance between the tip of the arc processing electrode and the workpiece,
An output signal (Ifa) of the first current detector and an output signal (S1) of the electrode distance setting device are input and a voltage value corresponding to a positive half-wave of the arc voltage is calculated to obtain a first arc voltage setting signal ｛Vra. = Aa + Ba × Ifa + (Ca + Da × If
a) × S1 Here, Aa, Ba, Ca and Da are a first arc voltage operation circuit that outputs a constant｝, an output signal (Ifb) of the second current detector, and an output signal (Sf) of the electrode distance setting device.
With 1) as an input, a voltage value corresponding to the negative half wave of the arc voltage is calculated, and a second arc voltage setting signal ｛Vrb = Ab + Bb × Ifb + (Cb + Db × If)
b) × S1 wherein the Ab, Bb, Cb and Db are setters having a second arc voltage operation circuit for outputting a constant｝. The arc load device according to claim 3 or 4, wherein is there.

[0010]

FIG. 1 is a connection diagram showing an example of an embodiment of the present invention. In the figure, reference numeral 1 denotes a DC arc machining power supply device having a drooping characteristic or a constant current characteristic, which is supplied with power from a not-shown commercial AC power supply or the like, and closes a start command switch TS connected to input terminals Tm3 and Tm4. As a result, a predetermined DC output is generated at the output terminals Tm1 and Tm2. Reference numeral 14 denotes an arc voltage setting device which sets a voltage corresponding to the arc voltage determined when measuring the characteristics of the power supply device 1 for DC arc machining. Reference numeral 9 denotes a pseudo-arc circuit. The input terminals Tm5 and Tm6 are connected to the output terminals Tm1 and Tm2 of the power supply device 1 for DC arc machining, respectively, and a voltage detector 10 connected between the input terminals Tm5 and Tm6. A comparator 11, a resistor 12, and a transistor 13 that compare the output signal Vr of the arc voltage setting device 14 input from the terminal Tm7 and the output signal Vf of the voltage detector 10 to output a difference signal ΔV = Vf−Vr.
Consists of The arc load setting device 14 and the pseudo arc circuit 9 constitute an arc load device of the present invention.

In FIG. 1, the amount of conduction of the transistor 13 changes until the output signal Vr of the arc voltage setting device 14 and the output signal Vf of the voltage detector 10 become equal. Therefore, when the set value of the arc voltage setting device 14 is increased, the base current of the transistor 13 decreases, the conduction amount of the transistor 13 decreases, and the power supply device 1 for DC arc machining.
The output current from is reduced. As a result, the voltage between the output terminals Tm1 and Tm2 increases based on the output voltage-current characteristics of the DC arc machining power supply device 1, and the arc voltage increases. Conversely, when the set value of the arc voltage setting device 14 is reduced, the base current of the transistor 13 increases, and the conduction amount of the transistor 13 increases. As a result,
Output terminals Tm1 and Tm2 of power supply device 1 for DC arc machining
And the arc voltage decreases.

FIG. 2 is a diagram showing another embodiment of the pseudo arc circuit 9 of the present invention. In the figure, 16 is a capacitor connected between the input terminals Tm5 and Tm6 of the pseudo arc circuit 9, 10 is an arc voltage detector, and 11 is an output signal Vr of the arc voltage setter 14 input from the input terminal Tm7. And a comparator 17 which compares the output signal Vf of the voltage detector 10 and outputs a difference signal ΔV = Vf−Vr.
1 is proportional to the difference signal ΔV output from
A pulse width control (PWM) circuit for outputting a pulse signal of a constant frequency at N duty), 18 is a switching transistor, 19 is a diode connected in parallel with the switching transistor 18 in reverse polarity, It is provided to prevent a voltage from being applied. Reference numeral 20 denotes a resistor from which the value stored in the capacitor 16 is discharged.

In FIG. 2, the ON duty of the pulse signal output from the PWM circuit 17 changes so that the output signal Vr of the arc voltage setting device 14 and the output signal Vf of the voltage detector 10 become equal. Therefore, when the set value of the arc voltage setting device 14 is increased, the ON duty of the pulse signal output from the PWM circuit 17 decreases, and the ON duty of the switching transistor 18 decreases. As a result, the discharge amount of the capacitor 16 decreases, the average voltage of the capacitor 16 increases, and the arc voltage increases. Conversely, when the set value of the arc voltage setting device 14 is reduced, the ON duty of the pulse signal output from the PWM circuit 17 increases, and the switching transistor 18
Becomes larger. As a result, the discharge amount of the capacitor 16 increases, the average voltage of the capacitor 16 decreases, and the arc voltage decreases.

FIG. 3 is a diagram showing still another embodiment of the pseudo arc circuit 9 of the present invention. In the figure, 16 is a capacitor connected between the input terminals Tm5 and Tm6 of the pseudo arc circuit 9, 10 is a voltage detector, 11 is an output signal Vr of the arc voltage setting unit 14 input from the input terminal Tm7 and The comparator 23 compares the output signal Vf of the voltage detector 10 and outputs a difference signal ΔV = Vf−Vr.
A pulse width control (PWM) circuit for alternately outputting pulse signals P1 and P2 having a constant frequency with an ON duty proportional to the difference signal ΔV output from 1; 24 to 27 are bridge-connected switching elements; Diodes connected in parallel with the opposite polarities to the switching elements 24 to 27, respectively.
It is provided to prevent application of a reverse voltage to 4 to 27. The switching elements 24 to 27 and the diodes 28 to 31 constitute an inverter circuit 32. An output transformer 33 converts an output voltage of the inverter circuit 32. 34 is a resistor.

In FIG. 3, the ON duty of the pulse signals P1 and P2 output from the PWM circuit 23 changes so that the output signal Vr of the arc voltage setting device 14 and the output signal Vf of the voltage detector 10 become equal. . Therefore,
When the set value of the arc voltage setting device 14 is increased, the ON duty of the pulse signals P1 and P2 output from the PWM circuit 23 decreases, and the ON duty of the inverter circuit 32 decreases. As a result, the discharge amount of the capacitor 16 decreases, the average voltage of the capacitor 16 increases,
Arc voltage increases. Conversely, when the set value of the arc voltage setting device 14 is reduced, the ON duty of the pulse signals P1 and P2 output from the PWM circuit 23 increases, and the ON duty of the inverter circuit 32 increases. As a result, the discharge amount of the capacitor 16 increases, the average voltage of the capacitor 16 decreases, and the arc voltage decreases.

FIG. 4 is a diagram showing still another embodiment of the pseudo arc circuit 9 of the present invention. In the figure, 16 is a capacitor connected between the input terminals Tm5 and Tm6 of the pseudo arc circuit 9, 10 is a voltage detector, 11 is an output signal Vr of the arc voltage setting unit 14 input from the input terminal Tm7 and A comparator 38 compares the output signal Vf of the voltage detector 10 and outputs a difference signal ΔV = Vf−Vr.
Pulse width control (P) that outputs a pulse signal of a constant frequency with an ON duty proportional to the difference signal ΔV output from
WM) circuit, 40 is a switching transistor, 41 is a diode connected in parallel with the switching transistor 40 with the opposite polarity, and the switching transistor 40
Is provided to prevent the application of a reverse voltage to the power supply. 39 is a reactor, 42 is a diode, 43
Is a resistor. The electromagnetic energy stored in the reactor 39 while the transistor 40 is on is released through the resistor 43 while the transistor 40 is off.

In FIG. 4, the ON duty of the pulse signal output from the PWM circuit 38 changes so that the output signal Vr of the arc voltage setting device 14 and the output signal Vf of the voltage detector 10 become equal. Therefore, when the set value of the arc voltage setting device 14 is increased, the ON duty of the pulse signal output from the PWM circuit 38 decreases, and the ON duty of the switching transistor 40 decreases. As a result, the discharge amount of the capacitor 16 decreases, the average voltage of the capacitor 16 increases, and the arc voltage increases. Conversely, when the set value of the arc voltage setting device 14 is reduced, the ON duty of the pulse signal output from the PWM circuit 38 increases, and the switching transistor 40
Becomes larger. As a result, the discharge amount of the capacitor 16 increases, the average voltage of the capacitor 16 decreases, and the arc voltage decreases.

FIG. 5 is a diagram showing still another embodiment of the pseudo arc circuit 9 of the present invention. 4, reference numeral 44 denotes an output transformer, which is provided in place of the reactor 39 shown in FIG. 4, and the other components having the same functions as those in FIG. The description of the operation is the same as that of the embodiment shown in FIG.

In an actual arc load, a component depending on a change in arc current is included in the arc voltage. FIG. 6 is a diagram showing a relationship between the arc voltage Va and the current Ia using a distance (electrode distance) L between the electrode 2 and the workpiece 3 as a parameter. In the figure, the electrode distance L is
L1 <L2 <L3, and these relationships are A, B, C
When D and D are constants, it is expressed by the following equation (1). Va = A + B × Ia + (C + D × Ia) × L (1) However, in the embodiment shown in FIGS. 1 to 5, the arc current is not detected because the output current of the DC arc machining power supply device 1 is not detected. It cannot be used as an arc load device for knowing the dynamic characteristics with respect to the change of.

FIG. 7 is a connection diagram showing an example of another embodiment of the present invention which has solved this point. In the figure, reference numeral 1 denotes a DC arc machining power supply device having a drooping characteristic or a constant current characteristic, which is supplied with electric power from a not-shown commercial AC power supply or the like, and closes a start command switch TS connected to input terminals Tm3 and Tm4. Output terminals Tm1 and Tm
2 generates a predetermined DC output. 9 is a pseudo arc circuit,
45 is a current detector, 46 is an electrode distance setting device for setting a voltage corresponding to the distance between the tip of the electrode 2 and the workpiece 3,
47 is an arc voltage calculation circuit, which receives as input the output signal If of the current detector 45 from the input terminal Tm9 and the output signal S1 of the electrode distance setting device 46 from the input terminal Tm10.
The arc voltage is calculated, and an arc voltage setting signal Vr is output from the output terminal Tm8 to the pseudo arc circuit 9. As the pseudo arc circuit 9, the circuits of the embodiments shown in FIGS. 1 to 5 can be used.

FIG. 8 is a diagram showing an embodiment of the arc voltage calculation circuit 47 used in the embodiment of FIG. In the figure, 48, 51 and 53 are multipliers, 49, 50 and 52 are adders, 54 to 57 are voltage setting devices,
Voltages corresponding to the constants A to D in the above equation (1) are set, and constants a to d corresponding to these voltages are output. The relationship between the signals in FIG.
Is shown in Vr = a + b × If + (c + d × If) × S1 (2) where: Vr: arc voltage setting signal (corresponding to arc voltage Va in FIG. 6) If: output signal of current detector 45 (current Ia in FIG. 6) S1: Output signal of electrode distance setting device 46 (corresponding to electrode distance L in FIG. 6) a, b, c, d: Constants corresponding to constants A to D in FIG.

In the embodiment shown in FIGS. 7 and 8, the arc voltage calculation circuit 47 includes an arc current detector 45.
And the output signal S1 of the electrode distance setting device 46.
With the input as the input, the above-described calculation of the equation (2) is performed, and an arc voltage setting signal Vr that is directly proportional to the arc current is output to the pseudo arc circuit 9. As a result, a dynamic characteristic with respect to a change in the arc current can be known.

In the embodiment shown in FIGS. 1 and 7, an example is shown in which a power supply device for DC arc machining is used. However, when the present invention is applied to a power supply device for AC arc machining, The operation is the same if the devices shown in FIGS. 1 to 5 and FIGS. 7 and 8 are applied after the output is rectified.

The arc voltage calculation circuit 47 of the present invention shown in FIG. 8 may be constituted by using a microprocessor or a digital signal processor.

In the alternating current TIG arc welding method for aluminum alloy, the electron emission ability is different between an aluminum oxide film and a tungsten electrode, and the half-wave in which the tungsten electrode serves as a cathode emits electrons more easily. For this reason, when the tungsten electrode is used as the cathode, more current flows, resulting in an unbalanced current, and simply calculating the current component by the arc voltage calculation circuit 47 shown in FIG. 8 is not sufficient.

FIG. 9 is a connection diagram showing another embodiment of the present invention which solves this problem. In the figure, reference numeral 7 denotes a power supply device for AC arc processing having a drooping characteristic or a constant current characteristic, which is supplied with power from a not-shown commercial AC power supply or the like, and closes a start command switch TS connected to input terminals Tm17 and Tm18. As a result, a predetermined AC output is generated at the output terminals Tm15 and Tm16.
Reference numeral 58a denotes a first restriking voltage setting circuit, which will be described later with reference to FIG. 10, which sets the restriking voltage by using a positive half-wave of the AC arc machining power supply 7 as an input. Reference numeral 9a denotes a first pseudo arc circuit, and the circuits of the embodiments shown in FIGS. 1 to 5 can be used. 45a is a first current detector that detects a positive half-wave current of the AC arc machining power supply device 7 and outputs a signal Ifa. 46 corresponds to the distance between the tip of the electrode 2 and the workpiece 3. An electrode distance setting device 47a for setting a voltage to be output and outputting a signal S1; 47a is a first arc voltage operation circuit, which receives an output signal Ifa of the first current detector 45a from an input terminal Tm9a, and receives an electrode from an input terminal Tm10a. The output signal S1 of the distance setter 46 is input, the arc voltage is calculated, and the arc voltage setting signal Vra is output from the output terminal Tm8a to the first pseudo arc circuit 9a. As the first arc voltage calculation circuit 47a, the circuit of the embodiment shown in FIG. 8 can be used.

58b is a second restrike voltage setting circuit,
45b is a second current detector, 47b is a second arc voltage calculation circuit, 9b is a second pseudo arc load circuit, and these are circuits that receive a negative half-wave of the AC arc machining power supply 7 as an input. The first re-ignition voltage setting circuit 58 described above
a, first current detector 45a, first arc voltage calculation circuit 4
7a and the first pseudo arc circuit 9a have the same functions as those of the first and second pseudo arc circuits 9a, respectively, and thus description thereof is omitted.

FIG. 10 is a diagram showing an embodiment of the re-ignition voltage setting circuit 58 used in the embodiment of FIG. In the figure, reference numeral 59 denotes a diode, which inputs the output of the power supply device 7 for AC arc machining from the input terminals Tm11 and Tm12 and outputs a positive or negative half wave. 60 is a thyristor,
Reference numeral 61 denotes a voltage setting device, which outputs a signal to the thyristor 60 to conduct when detecting a preset voltage.

FIGS. 11A and 11B are diagrams showing waveforms in the embodiments of FIGS. 9 and 10, wherein FIG. 11A shows the input voltage of the AC arc machining power supply 7, FIG. 11B shows the arc voltage, and FIG. The current is shown.

In FIGS. 9 to 11, the output of the AC arc machining power supply 7 is inverted every half cycle, but the first and second restrike voltage setting circuits 58a and 58b output the AC arc machining power. The positive and negative output voltages of the power supply 7 are supplied to the first and second pseudo arc circuits 9a.
And 9b respectively. The first and second arc voltage calculation circuits 47a and 47b receive a voltage signal corresponding to the distance between the electrode 2 and the workpiece 3 output from the electrode distance setting device 46, and output the first and second currents. The detectors 45a and 45b input the positive and negative output currents of the AC arc machining power supply device 7, respectively, calculate the arc voltage in each half wave, and set the arc voltage setting signal V
Ra and Vrb are converted to first and second pseudo arc circuits 9a.
And 9b.

As shown in FIG. 11B, the arc voltage artificially generated by these operations is delayed in phase by the reactor of the AC arc machining power supply device 7, and the arc current shown in FIG. When becomes zero, the polarity is inverted. As a result, even when an unbalanced current is generated as in the case of an AC TIG arc welding method of an aluminum alloy, it is possible to know dynamic characteristics that immediately respond to changes in the arc current.

[0032]

According to the first and second aspects of the present invention, the simulated arc voltage can be continuously changed in the characteristic test of the power supply device for arc machining. It is not necessary to change the number of diodes or batteries to be connected each time to set, and the effect is that the set value of the arc voltage can be easily adjusted only by adjusting the arc voltage setter.

According to the third and fourth aspects of the present invention, in the characteristic test of the power supply device for AC arc machining, the simulated arc voltage can be continuously changed. There is no need to change the number of diodes or batteries to be connected each time for setting, and there is an effect that the set value of the arc voltage can be easily adjusted only by adjusting the arc voltage setter.

According to a fifth aspect of the present invention, in the characteristic test of the power supply device for arc machining, the first and second aspects are described.
In addition to the effects of the invention described in (1), there is an effect that dynamic characteristics with respect to a change in arc current can be known.

According to a sixth aspect of the present invention, when an unbalanced current is generated due to a difference in electron emission ability between an aluminum oxide film and a tungsten electrode, as in the alternating current TIG arc welding method for an aluminum alloy, the arc current is reduced. Dynamic characteristics that respond immediately to changes in

[Brief description of the drawings]

FIG. 1 is a connection diagram illustrating an example of an embodiment of the present invention.

FIG. 2 is a diagram showing another embodiment of the pseudo arc circuit 9 of the present invention.

FIG. 3 is a diagram showing still another embodiment of the pseudo arc circuit 9 of the present invention.

FIG. 4 is a diagram showing still another embodiment of the pseudo arc circuit 9 of the present invention.

FIG. 5 is a diagram showing still another embodiment of the pseudo arc circuit 9 of the present invention.

FIG. 6 is a diagram showing a relationship between an arc voltage Va and a current Ia using an electrode distance L as a parameter.

FIG. 7 is a connection diagram showing an example of another embodiment of the present invention.

8 is an arc voltage calculation circuit 47 used in the embodiment of FIG.
It is a figure which shows the Example of.

FIG. 9 is a connection diagram showing an example of still another embodiment of the present invention.

FIG. 10 shows a re-ignition voltage setting circuit 5 used in the embodiment of FIG.
It is a figure which shows Example of No.8.

FIG. 11 is a diagram showing each waveform in the embodiment of FIGS. 9 and 10;

FIG. 12 is a diagram showing a state in which a general arc is generated.

FIG. 13 is a diagram showing a connection diagram of an example of a conventional arc load device.

FIG. 14 is a diagram showing a connection diagram of another example of a conventional arc load device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 DC arc processing power supply device 2 Arc processing electrode 3 Workpiece 4 Arc 5 Diode 6 Battery 7 AC arc processing power supply device 9 Pseudo arc circuit 9 a First pseudo arc circuit 9 b Second pseudo arc circuit 10 Voltage detection Unit 11 Comparator 12 Resistor 13 Transistor 14 Arc voltage setting unit 16 Capacitor 17 Pulse width control (PWM) circuit 18 Switching transistor 19 Diode 20 Resistor 23 Pulse width control (PWM) circuit 24, 25, 26, 27 Switching element 28 , 29, 30, 31 Diode 32 Inverter circuit 33 Output transformer 34 Resistor 38 Pulse width control (PWM) circuit 39 Reactor 40 Switching transistor 41, 42 Diode 43 Resistor 44 Output transformer 45 Current detector 45a First current Detector 45b Second current detector 46 Electrode distance setting device 47 Arc voltage operation circuit 47a First arc voltage operation circuit 47b Second arc voltage operation circuit 48 Multipliers 49, 50 Adder 51 Multiplier 52 Adder 53 Multiplier 54 , 55, 56, 57 Voltage setting device 58 Re-ignition voltage setting circuit 58a First re-ignition voltage setting circuit 58b Second re-ignition voltage setting circuit 59 Diode 60 Thyristor 61 Voltage setting device TS start command switch

Claims (6)

[Claims] An arc load device connected to an output terminal of an arc processing power supply device having a drooping characteristic or a constant current characteristic and used for measuring an output characteristic of the arc processing power supply device, wherein the arc processing power supply is used. A voltage detector connected between output terminals of the device, an arc voltage setting device for setting an arc voltage, and an output signal (V
f) and the output signal (Vr) of the arc voltage setting device, which is connected between the output terminals of the power supply device for arc machining in which the amount of conduction changes in proportion to the input with the difference (ΔV = Vf−Vr) being input. Load device provided with an analog element. 2. An arc load device connected to an output terminal of an arc processing power supply device having a drooping characteristic or a constant current characteristic and used for measuring an output characteristic of the arc processing power supply device, wherein the arc processing power supply is used. A capacitor connected between output terminals of the device, a voltage detector connected to both terminals of the capacitor, an arc voltage setter for setting an arc voltage, and an output signal (Vf) of the voltage detector
(Δr) between the output signal (Vr) of the arc voltage setting device and
V = Vf−Vr) as an input, and a pulse generator for generating a pulse having a conduction time ratio proportional to the input at a predetermined frequency;
A switching element connected in parallel with the capacitor and controlled in conduction by an output pulse of the pulse generator. 3. An arc load device connected to an output terminal of an AC arc processing power supply device having a drooping characteristic or a constant current characteristic and used for measuring output characteristics of the AC arc processing power supply device, wherein the AC arc processing device A first re-ignition voltage setting circuit for setting a re-ignition voltage by inputting a positive half-wave of the output voltage of the processing power supply device, and an output terminal of the first re-ignition voltage setting circuit. A first voltage detector;
A second re-ignition voltage setting circuit for setting a re-ignition voltage by inputting a negative half wave of the output voltage of the AC arc processing power supply device, and an output terminal of the second re-ignition voltage setting circuit; A second voltage detector connected thereto, an arc voltage setting device for setting an arc voltage, and an output signal (Vf) of the first voltage detector.
a) and the output signal (Vr) of the arc voltage setting device (ΔVa = Vfa−Vr) as an input, and the amount of conduction changes in proportion to the input. A first analog element connected therebetween, and a difference (ΔVb = Vfb−Vr) between an output signal (Vfb) of the second voltage detector and an output signal (Vr) of the arc voltage setter are input and input. An arc load device comprising: a second analog element connected between output terminals of the second restrike voltage setting circuit, the amount of conduction of which is proportionally changed. 4. An arc load device which is connected to an output terminal of a power supply device for AC arc machining having drooping characteristics or constant current characteristics and is used for measuring output characteristics of the power supply device for AC arc machining, wherein: A first re-ignition voltage setting circuit for setting a re-ignition voltage by inputting a positive half-wave of the output voltage of the processing power supply device, and an output terminal of the first re-ignition voltage setting circuit. A first capacitor;
A first voltage detector connected to both terminals of the first capacitor, and a second re-ignition voltage setting for setting a re-ignition voltage by using a negative half-wave of an output voltage of the power supply device for AC arc machining as an input. A circuit, a second capacitor connected between output terminals of the second restrike voltage setting circuit, a second voltage detector connected to both terminals of the second capacitor, and an arc for setting an arc voltage. A voltage setting device, and a difference (ΔV = Vfa−Vr) between an output signal (Vfa) of the first voltage detector and an output signal (Vr) of the arc voltage setting device is input and is proportional to the input at a predetermined frequency. A first pulse generator for generating a pulse having a conduction time rate, a first switching element that is controlled in conduction by an output pulse of the first pulse generator connected in parallel with the first capacitor, and a second voltage detection Output signal (V a second pulse generator that receives a difference (ΔV = Vfb−Vr) between b) and the output signal (Vr) of the arc voltage setter and generates a pulse having a conduction time ratio proportional to the input at a predetermined frequency; An arc load device comprising: a second switching element connected in parallel with the second capacitor and controlled in conduction by an output pulse of the second pulse generator. 5. A current detector for detecting an output current of the power supply device for arc processing as the arc voltage setting device,
An electrode distance setting device for setting a voltage corresponding to a distance between the tip of the arc processing electrode and the workpiece; an output signal (If) of the current detector; and an output signal (S1) of the electrode distance setting device. , An arc voltage setting signal {Vr = A + B × If + (C + D × If) × S1 where A, B, C and D are constants. The arc load device according to claim 1, wherein the setting device includes a circuit. 6. A first current detector for detecting a positive half-wave of an output current of the power supply device for AC arc processing as the arc voltage setting device, and a negative current of an output current of the power supply device for AC arc processing is provided. A second current detector for detecting a half-wave, an electrode distance setting device for setting a voltage corresponding to a distance between the tip of the arc machining electrode and the workpiece, and an output signal of the first current detector ( Ifa) and the output signal (S1) of the electrode distance setting device as inputs, a voltage value corresponding to a positive half-wave of the arc voltage is calculated and a first arc voltage setting signal ｛Vra = Aa + Ba × Ifa + (Ca + Da × If)
a) × S1 Here, Aa, Ba, Ca and Da are a first arc voltage operation circuit that outputs a constant｝, an output signal (Ifb) of the second current detector, and an output signal of the electrode distance setting device ( S1) and the second arc voltage setting signal に Vrb = Ab + Bb × Ifb + (Cb + Db × If) by calculating a voltage value corresponding to the negative half-wave of the arc voltage.
b) × S1 The arc load device according to claim 3, wherein Ab, Bb, Cb, and Db are setters including a second arc voltage operation circuit that outputs a constant｝.