JPH04347577A - Power source and arc generator - Google Patents

Abstract

PURPOSE:To properly use a single-phase AC to meet characteristics of a load and to improve a power utility efficiency by converting in ranges of each phase by different power converters. CONSTITUTION:A phase controller 110 of a first power converter 101 supplies only a part of 0-60 deg. of a sine wave of each phase to primary coils 151-153, and outputs a single-phase AC from a secondary coil 154 through a transforming section 150. Similarly, second, third power converters 102, 103 output only parts of 60-120 deg., 120-180 deg. of the sine wave of each phase. Since a frequency of three times as large as that of the three-phase AC of the primary side is obtained as each single-phase output of a secondary side, the welding speed becomes, if it is used for an arc welding, etc., three times. Since the output of the converter 103 is a sawtooth wave which abruptly rises and becomes zero in a drooping state, an arc is easily obtained at the time of arc welding, and a stable arc is obtained.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a power supply device and an arc generator, and in particular the ignition control of each phase of input three-phase alternating current or single-phase alternating current is divided into several pulse waveforms of a predetermined shape. A power supply device and a power supply device capable of obtaining a power supply output waveform suitable for the load, and in particular, in the case of three-phase alternating current, appropriately recombining the pulsed waveforms of the divided specific waveforms of each phase, and the power supply device capable of obtaining various output waveforms. This relates to arc generators equipped with power supplies, as well as welding equipment for AC arc welding, spot welding, seam welding, etc., power supplies for arc welding and submerged robot loading, lighting equipment, vibrators, electric motors, and electric heat. The present invention relates to a power supply device that can provide high efficiency as a power source for appliances, etc.

0002

2. Description of the Related Art Generally, single-phase alternating current is used as a power source for spot welding equipment, lighting equipment, electric motors, electric heaters, and the like. Devices that convert three-phase AC into single-phase AC to obtain this single-phase AC include Scott wiring, three-phase low frequency system, and inverter system. There is a problem that phase unbalance occurs, and there is also a problem that input power is used inefficiently.

[0003] In other words, the above-mentioned Scott wiring has a complicated circuit configuration and is large enough to be used as a power supply, and it is difficult to extract a stable current, such as when twice the excessive current flows in one of the three phases. In particular, there were problems with reliability as a power supply device.

[0004] Furthermore, although the above-mentioned three-phase low frequency system has been adopted as a power source for spot welding equipment, there have been problems in that the equipment is large, expensive, and frequently breaks down.

[0005] Furthermore, since arc welding equipment generally requires a large current, two types of power supply systems are used: a magnetic leakage type and a reactor type. The former uses a magnetic leakage transformer as a transformer, and the latter uses a magnetic leakage transformer. In this example, a saturable reactor is inserted in series with a discharge circuit composed of the secondary side of a transformer and an arc electrode. In all of these cases, the voltage suddenly rises to a high level, and then the voltage drops rapidly.
Efforts have been made to obtain output characteristics that match the drooping characteristics during arc welding, but these have the problem of large electromagnetic leakage in the transformer and large losses due to reactors.

[0006] Furthermore, the inverter method that has been adopted recently rectifies the alternating current, increases the frequency to over 10,000 cycles for lighting, and about several hundred to 1,200 cycles for welding, and then inserts it into a transformer, which outputs it again. This is a rectification method, which allows the transformer to be made smaller and lighter, but it is extremely expensive, inefficient, and frequently breaks down. Therefore, a small, lightweight, and efficient power supply device was required.

[0007]

[Problems to be Solved by the Invention] This invention was made in view of the above circumstances. The purpose of the present invention is to obtain a completely new power supply device that can convert the waveform into single-phase AC with a waveform suitable for the AC and supply it to a load.

[0008] Furthermore, the present invention can divide the positive and negative half waves of the sine wave of each phase of the three-phase AC input into three types of pulse waves: front, middle, and rear. An object of the present invention is to obtain a power supply device that can separately output three types of single-phase alternating current in which waveforms are combined according to type.

[0009] Furthermore, the present invention provides the above power supply device, which includes:
It is an object of the present invention to provide a power supply device that can simultaneously output the above three types of single-phase alternating current and also output a single-phase alternating current that is opposite in phase to each of the single-phase alternating currents.

[0010] Furthermore, the present invention can divide the positive and negative half waves of the sine wave of each phase of the three-phase AC input into three types of pulse-like waves, the front, middle, and rear parts. The object of the present invention is to obtain a power supply device that can extract the energy of the falling part of a pulsed wave as an instantaneous high voltage.

[0011] The present invention also provides a method in which a single-phase alternating current input having a sinusoidal waveform is processed by generating positive and negative pulsed waves having a phase angle of 50% of the positive and negative half-waves of the sine wave at predetermined intervals. It is an object of the present invention to obtain a power supply device that can convert and output single-phase alternating current that repeatedly appears.

[0012] Furthermore, the present invention aims to obtain an arc generating device which can sequentially generate a plurality of arcs in a plurality of arc generating electrodes arranged on the same circumference and emit the arcs powerfully while rotating them. purpose.

Furthermore, the present invention makes it possible to effectively utilize the waveform falling energy of the sawtooth alternating current applied to each of the arc electrodes, and moreover, the arc is not interrupted at the zero-crossing point of the alternating current waveform, and multiple arcs can be smoothly connected. The object is to obtain an arc generator that can be rotated.

[0014]

[Means for Solving the Problems] A power supply device according to the present invention is capable of inputting a three-phase AC input from 0 degrees to 6 degrees of each positive and negative half wave of each phase.
a first power converter that converts the three-phase AC input into a first single-phase AC consisting of a 0-degree part;
a second power converter that converts the three-phase AC input into a second single-phase alternating current consisting of a 0 degree to 120 degree portion; 3, a third power conversion section that converts the power into single-phase alternating current.

[0015] Furthermore, the present invention provides the above power supply device, which includes:
Output switching means that is connected to the output terminals of the first, second, and third power converters, and selects and outputs one of the first, second, and third single-phase alternating currents based on a control signal. It is equipped with the following.

The power supply device according to the present invention converts each phase of the three-phase AC input into 0 of each positive and negative half-wave of a sine wave for each phase.
degrees to 60 degrees, 60 degrees to 120 degrees, or 120 degrees to 1
It consists of a phase control circuit that can be supplied in any range of 80 degrees, a three-phase primary coil on the primary side of a single-phase iron core, and a single-phase secondary coil on the secondary side. A transformer unit connects the three-phase primary coil to each phase voltage of the three-phase AC input via the phase control circuit, and the supply range of each phase by the phase control circuit is set so that the phases do not overlap. and supply range setting means.

[0017] In the power supply device, the present invention provides first to third coils each having single-phase primary and secondary coils wound around the primary and secondary sides of a single-phase iron core, respectively, in place of the transformer. The primary coil of each transformer is connected to each phase of the three-phase AC input via the phase control circuit.

According to the present invention, in the above power supply device, the secondary coils of each of the transformers are connected in parallel.

[0019] The power supply device according to the present invention performs single-phase AC input only in the positive and negative half-wave ranges of 0 degrees to 90 degrees, 45 degrees to 135 degrees, or 90 degrees to 180 degrees. In addition to being equipped with a phase control circuit, single-phase primary and secondary coils are wound around the primary and secondary sides of a single-phase iron core, respectively, and the primary coil is connected to the single-phase AC input via the phase control circuit. The device is equipped with a connected transformer, and the supply range of the single-phase AC input is set from among the three ranges.

The power supply device according to the present invention includes a first power converter that outputs each phase of a three-phase AC input separately in the range of 0 degrees to 60 degrees of each positive and negative half wave; A second power converter that outputs each phase of the phase AC input separately in the positive and negative half-wave range of 60 degrees to 120 degrees, and a second power converter that outputs each phase of the three-phase AC input separately in the positive and negative half-wave range, respectively. Half wave 120 degrees ~ 180
and a third power conversion section that outputs each phase separately within a range of 100°C to generate nine single-phase outputs.

[0021] In the power supply device according to the present invention, the first power converter outputs each phase of the three-phase AC input separately in the range of 0 degrees to 60 degrees of each positive and negative half wave. At the same time, it is configured to additionally output a high voltage at around 60 degrees of each half wave of each phase due to a sudden fall change of each output,
The second power converter outputs each phase of the three-phase AC input separately in the range of 60 degrees to 120 degrees of positive and negative half waves, and It is configured to additionally output a high voltage near 120 degrees of each half wave of each of the above-mentioned phases, thereby generating nine single-phase outputs and six additional outputs.

The arc generator according to the present invention is equipped with a power supply device that generates nine single-phase outputs by the first, second, and third power converters, respectively, and a first power supply device for generating an arc. - A ninth arc electrode is arranged in a certain direction in order so that its tip is located on the vertex of one regular nonagon, and the first to third arc electrodes, the fourth to sixth arc electrodes, and the The 7th to 9th arc electrodes are connected to the first and second arc electrodes, respectively.
, a third group, and all the outputs of the first, second, and third power converters, that is, nine single-phase outputs, are applied to the arc electrodes of the same group, where three outputs that generate voltage at the same timing The arc electrodes are assigned to the above nine arc electrodes so that

[0023] The arc generator according to the present invention has the above-mentioned 9
It is equipped with a power supply device that generates one single-phase output and six additional outputs, and in addition to the above-mentioned first to ninth arc electrodes,
Further, two first to sixth auxiliary electrodes are provided for each group of arc electrodes, and for the nine single-phase outputs,
Assign these to the nine arc electrodes in the same way as above, and for the six additional outputs above, two additional outputs that generate high voltages with different polarities at the same timing are applied to the auxiliary electrodes of the same group of the above arc electrodes. 6 auxiliary electrodes.

The power supply device according to the present invention includes a 3-phase/6-phase conversion circuit for converting 3-phase AC input into 6-phase AC power, and comprises 1st, 3rd, and 5th phases of the 6-phase AC power. The positive phase three phase components are 0 to 60 of each positive and negative half wave of the three phases.
In addition to converting into the first to third single-phase alternating current consisting of degree minutes, 60 degrees to 120 degrees, and 120 degrees to 180 degrees,
The reverse three-phase component consisting of the second, fourth, and sixth phases of the phase current is
0 to 60 degrees, 60 degrees to 1 of each positive and negative half wave of the three phases
It is designed to convert into fourth to sixth single-phase alternating current consisting of 20 degrees and 120 degrees to 180 degrees.

The power supply device according to the present invention includes a 3-phase/6-phase conversion circuit that converts 3-phase AC input into 6-phase AC power, and converts each phase of the 6-phase AC into positive and negative half-waves of each phase. 0 degrees ~ 60
6-phase primary coil on the primary side of the single-phase iron core and a 6-phase primary coil on the secondary side of the single-phase iron core. A transformer is formed by winding a single-phase secondary coil, and the six-phase primary coil is connected to each phase voltage of the three-phase/six-phase conversion circuit via the phase control circuit, and each of the above-mentioned The phase supply range is set by a range setting means.

[0026] The present invention provides the above power supply device in which, instead of the transformer, a three-phase primary coil is wound around the primary side of a single-phase iron core, and a single-phase secondary coil is wound around the secondary side of the single-phase iron core. First and second transformers are provided, and the three-phase primary coil of the first transformer is connected to the six-phase AC first phase, third phase,
The 5th phase is connected to the 3-phase primary coil of the second transformer to the 2nd, 4th, and 6th phases of the 6-phase AC via the phase control circuit.

[Effect]

[0027] In the present invention, a first power converter converts a three-phase AC input into a first single-phase AC consisting of 0° to 60° portions of positive and negative half-waves of each phase; a second power conversion unit that converts the phase AC input into a second single-phase AC consisting of 60 degrees to 120 degrees of positive and negative half waves of each phase;
Since it is equipped with a third power conversion unit that converts the phase alternating current into a third single-phase alternating current consisting of 120 degrees to 180 degrees of the positive and negative half waves of each phase, the above three By using different types of single-phase AC, it is possible to improve the power usage efficiency at the load, and by using the single-phase output of each power converter at the same time, one unit can do the work of three single-phase power supplies. You can do it with

Furthermore, since the output switching means for switching and outputting the first to third single-phase outputs based on the control signal is provided, even if the load characteristics change over time due to operating conditions, etc. By switching the power supply output according to changes in load characteristics, the efficiency of power usage at the load can always be optimized.

In this invention, the three-phase AC input is applied to each phase of the positive and negative half-waves of the sine wave from 0 degrees to 60 degrees and 6 degrees.
In addition to providing a phase control circuit that can supply a range of 0 degrees to 120 degrees or 120 degrees to 180 degrees, a three-phase primary coil that receives the phase control output of each phase, and a single Single-phase two magnetically coupled via a phase iron core
A transformer with a secondary coil is installed, and the supply range of each phase by the phase control circuit is set so that the phases do not overlap, so that the sine waves of each phase of the 3-phase AC input are Each half-wave is decomposed into three pulse-like waveforms: front, middle, and rear, and these three types of pulse-like waveforms can be output as single-phase alternating current by arranging them in a desired order. This allows fine control of the waveform of the power output.

[0030] Also, in place of the above transformer, a single-phase transformer is used.
Since each primary coil was connected to each phase of the three-phase AC input via the phase control circuit, the front and middle parts of the sine wave were connected to the secondary side of the transformer for each transformer. , the rear pulse wave can be output discretely, and single-phase output with a waveform different from the above is possible, and the output of such a waveform may also be effective depending on the load.

Furthermore, by connecting the secondary sides of each transformer in parallel, it is also possible to output triple-frequency single-phase alternating current in which three types of pulse-like waveforms appear in a predetermined order, similar to the above.

Furthermore, in the present invention, a phase control circuit is provided which supplies the single-phase AC input only to a predetermined portion corresponding to 50% of the phase angle of each positive and negative half-wave, and the phase control circuit supplies the single-phase AC input only to a predetermined portion corresponding to 50% of the phase angle. Since the output is made through a transformer, predetermined portions of each positive and negative half-wave of the sine wave of the single-phase AC input are output as discrete pulse-like waves on the secondary side of the single-phase transformer. There are cases where outputting such a waveform is effective.

In the present invention, the first power converter section outputs each phase of the three-phase AC input separately in the range of 0 degrees to 60 degrees of each positive and negative half-wave, and A second power converter that outputs the phases separately in the range of 60 degrees to 120 degrees for each positive and negative half wave, and a second power converter that outputs each phase of the 3-phase AC input separately in the range of 120 degrees to 180 degrees for each positive and negative half wave. 3-phase AC input, the sine waves of the 1st phase, 2nd phase, and 3rd phase of the 3-phase AC input are output before each of the positive and negative half-waves. It is decomposed into three types of pulse-like waveforms: front, middle, and rear, and as a result, nine types of single-phase outputs with different waveforms or voltage generation timings can be obtained. In this case, special effects can be obtained by separately supplying nine types of single-phase outputs to a plurality of input terminals of the load.

Furthermore, for each of the transformers of the first and second power conversion sections, an additional transformer is provided that generates a high voltage due to a sudden fall change in the secondary output of the transformer. By supplying high voltage to the load, three-phase AC energy can be used more effectively, and
It is possible to compensate for the power drop near the zero-crossing point of the nine single-phase outputs.

Further, in the present invention, a power supply device is installed which generates nine single-phase outputs by each of the first to third power converters, and the first to ninth arc electrodes for generating an arc are mounted. are sequentially arranged in a certain direction so that their tips are located on the vertices of one regular ninegon, and the first
~Third arc electrode, fourth to sixth arc electrode, seventh~
The ninth arc electrodes are set as the first, second, and third groups, respectively, and all outputs of the first, second, and third power converters, that is, nine single-phase outputs, are generated at the same timing. Since the three outputs are assigned to the nine arc electrodes above so that they are applied to the same group of arc electrodes, the three outputs
Three arcs will occur sequentially in each group, and three arcs will occur sequentially in each group.
It can be powerfully emitted while rotating two arcs.

Furthermore, the present invention is equipped with a power supply device that generates the nine single-phase outputs and six additional outputs, and in addition to the first to ninth arc electrodes, the first to sixth arc electrodes are Two auxiliary electrodes are provided for each group of arc electrodes, and for the nine single-phase outputs, these are assigned to the nine arc electrodes in the same way as above, and for the six additional outputs, they are assigned at the same timing. Two additional outputs that generate high voltages with different polarities are assigned to the six auxiliary electrodes so that they are applied to the auxiliary electrodes in the same group of the arc electrodes, so the spark between the auxiliary electrodes causes the zero-crossing points of the nine outputs to It is possible to prevent interruption of the arc at the point where the arc occurs, and also to cause dielectric breakdown in the region where the arc occurs, making it easier for the arc to occur.

The present invention includes a 3-phase/6-phase conversion circuit that converts 3-phase AC input into 6-phase AC power, and has 3 positive phases consisting of the 1st, 3rd, and 5th phases of the 6 phases. component, and for each of the negative phase three-phase components consisting of the second, fourth, and sixth phases, 0 to 60 degrees of the positive and negative half waves of the three phases, 6
The first part consists of 0 degrees to 120 degrees and 120 degrees to 180 degrees.
, 2nd and 3rd single phase alternating current, so 3
By adding the phase AC input to three types of triple frequency single phase AC having different waveforms, it is possible to obtain a single phase AC having a phase opposite to each of the single phase AC.

In the present invention, a 3-phase/6-phase conversion circuit is provided for converting 3-phase AC input into 6-phase AC power, and each phase of the 6-phase AC is converted to 0 for each positive and negative half wave of each phase.
degrees to 60 degrees, 60 degrees to 120 degrees, or 120 degrees to 1
A phase control circuit capable of supplying in any range within the 80 degree range is provided, the supply range of each phase is set by a supply range setting means, and each phase voltage is set between the 6-phase primary coil and the single-phase 2nd phase. Since the output is made through a transformer with a secondary coil, the sine wave of each phase of the 6-phase AC is decomposed into three types of pulse waveforms: front, middle, and rear for each positive and negative half wave. , further arranging the three types of pulse waveforms in a desired order,
It can be output as triple frequency single-phase alternating current, or single-phase alternating current with a phase opposite to the single-phase alternating current.

Further, in the present invention, the above-mentioned 3-phase/6-phase conversion circuit, the above-mentioned phase control circuit, and the above-mentioned supply range setting means are provided, and the 3-phase primary coil and the single-phase secondary coil are connected to a single unit. Equipped with a first and second transformer magnetically coupled by a core, the secondary side of each transformer is connected in series, and the first, third, and fifth phases of six phases are connected to the first transformer. The 6-phase 2nd, 4th, and 6th phases are outputted through the second transformer, so the 1st, 3rd, and 5th phases are The fourth, sixth, and
By making the supply range for each half-wave of the second phase the same, it is possible to obtain a single-phase alternating current with a frequency three times the voltage doubler.

[0040]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram for explaining a power supply device according to an embodiment of the present invention, FIG. 2 is a diagram showing the circuit configuration of the power supply device, and FIG. 5 is a sine wave cycle of each phase of three-phase AC input. FIG. 3 is a diagram showing individual pulse-like waves obtained by dividing the waveform into 60-degree segments using t as the phase angle. In the figure, 100 is a power supply device having input terminals 1, 2, and 3 connected to each phase of a three-phase AC input, that is, R phase, S phase, and T phase, and includes first to third power conversion units 101 to 3. It is composed of 103. The first
The power converter 101 includes a first phase control circuit 110 that supplies three-phase AC input only to the front portions of the positive and negative half waves of each phase sine wave, that is, the range of about 0 degrees to 60 degrees, and 3-phase primary coils 151 to 153 on the side, and single-phase 2 coils on the secondary side.
The three-phase primary coils 151 to 153 are connected to the three-phase AC input terminals 1, 2, and 3 via the first phase control circuit 110. and a transformer section 150, the output terminal 101a of which
A first single-phase alternating current (hereinafter referred to as F output) is output from the output.

Further, the second power converter 102 has a second phase control circuit that supplies three-phase AC input only to the middle portions of each positive and negative half-wave of each phase, that is, in the range of about 60 degrees to 120 degrees. 120, and three-phase primary coils 161 to 163 on the primary side.
has a single-phase iron core 160a around which a single-phase secondary coil 164 is wound on the secondary side, and the three-phase primary coils 161 to 16
3 is connected to the input terminal 1 via the second phase control circuit 120.
, 2, 3, and a second single-phase AC (hereinafter referred to as M output) from its output terminal 102a.
It is designed to output .

[0042] The third power converter 103 also performs third phase control to supply the three-phase AC input only to the back portion of each positive and negative half-wave of each phase, that is, in the range of about 120 degrees to 180 degrees. A circuit 130 and a three-phase primary coil 171 to 1 on the primary side.
73 has a single-phase iron core 170a around which a single-phase secondary coil 174 is wound on the secondary side, and the three-phase primary coils 171 to
173 includes a transformer section 170 connected to the input terminals 1, 2, and 3 via the third phase control circuit 130,
A third single-phase alternating current (hereinafter referred to as B output) is output from the output terminal 103a.

FIG. 3 shows details of the phase control circuit 110, in which 110a to 110c are thyristors that turn on and off the R, S, and T phases, respectively, and 112 is a zero of the sine wave of each phase of the three-phase AC input. Zero cross point detector to detect cross points,
111a to 111c are phase adjusters that receive the output of the zero cross point detector 112 and adjust the firing angles of the thyristors 110a to 110c of each phase. Each of the thyristors is set to fire in the range of 0 degrees to 60 degrees for each phase. Although the details of only the first phase control circuit 110 are shown here, the details of the second and third phase control circuits 1
20 and 130, except that the phase adjusters are set so that the firing range of the thyristor of each phase is 60 degrees to 120 degrees, and 120 degrees to 180 degrees.
It has the same circuit configuration as the phase control circuit 110 of.

Next, the operation will be explained. The three-phase AC power applied to the input terminals 1, 2, and 3 of the power supply device 100 is converted into the F output, M output, and B output by the first to third power conversion units 101 to 103, respectively. and is output to each output terminal 101a to 103a.

That is, in the first power converter 101, the energization of the three-phase primary coils 151 to 153 of the three-phase AC input transformer 150 is carried out by the first phase control circuit 110.
As shown in Figure 4(a), each of the above 1
The secondary coils 151 to 153 have a phase angle range of 0 degrees to 60 degrees for each positive and negative half wave of each phase sine wave (R1 and R4 for R, S3 and S6 for S, T for T
2 and T5), and each coil is in an open state at other times. In this way 3
When the coils 151 to 153 of each phase are sequentially energized, a magnetic flux having a triple frequency drooping characteristic is induced in the iron core 150a, and as a result, the secondary coil 154 has a magnetic flux as shown in FIG.
A sawtooth triple frequency F output as shown in a) is output.

Further, in the second power converter 102, the three-phase primary coil 16 of the three-phase AC input transformer 160
1 to 163 is controlled by the second phase control circuit 120, and as shown in FIG. phase angle in the range of 60 degrees to 120 degrees (R2 and R5 for R, S1 and S4 for S, T for T
3 and T6), and each coil is in an open state at other times. In this way 3
When the coils 161 to 163 of each phase are sequentially energized, a magnetic flux with triple frequency drooping characteristics is induced in the iron core in the same way as described above, and this causes the secondary coil 164 to have a magnetic flux as shown in FIG. ) A sawtooth triple frequency M output is output as shown in .

Further, in the third power converter 103, the three-phase primary coil 17 of the three-phase AC input transformer 170
The energization to 1 to 173 is controlled by the third phase control circuit 130, and as shown in FIG. phase angle range of 120 degrees to 180 degrees (for R, R3
and R6, S2 and S5, and T1 and T4), and each coil is in an open state at other times. When the three-phase coils 171 to 173 are sequentially energized in this way, a magnetic flux with triple frequency drooping characteristics is induced in the iron core as described above, and this leads to the secondary coil 174. A sawtooth triple frequency B output as shown in FIG. 4(c) is output.

As described above, in this power supply device, each power converter can output three types of triple frequency single-phase AC having different waveforms, that is, different characteristics. Each of these sawtooth triple frequency power outputs has the following effects.

(1) As mentioned above, each single-phase output on the secondary side has a frequency three times that of the three-phase AC on the primary side, that is, 180 cycles compared to 60 cycles. When used for arc welding, etc., the welding speed is three times that of a conventional three-phase/single-phase converter. At the same speed, the welding beat is three times finer than with conventional welding. In this way, the quality of welding can be improved.

(2) In the conventional three-phase/single-phase conversion power supply, the single-phase output obtained is a sine wave, but the B output obtained with this power supply suddenly rises to a high voltage and then begins to droop. Since a sawtooth wave that becomes zero is obtained, an arc is easily generated during arc welding, and a stable arc can be obtained. In other words, this power supply device essentially has a drooping characteristic, which is extremely convenient for welding.

(3) Since the power source of the present invention has the drooping characteristic as described above, in order to obtain this drooping characteristic, a leakage flux type device or a saturable reactor L, etc., which have been commonly used in the past, is used. There is no need to use it, and there is no associated loss or reduction in power factor.

(4) Furthermore, since the M output obtained by this power supply device has a high power, when this M output is used alone, it is suitable for large-scale welding and thermal spraying.

(5) Furthermore, since the R output rises more slowly than other outputs, it is effective for welding where spark generation is a problem when voltage is applied, such as spot welding of thin plates.

(6) Furthermore, since the frequency obtained is tripled for each output, the transformer becomes smaller and its weight is reduced to 1/3 of the conventional one, making it extremely small and lightweight. Furthermore, since the structure is simple, small and lightweight, manufacturing costs can be significantly reduced.

(7) In addition, the conventional device required a no-load voltage of 60V to 100V, but the present invention requires a no-load voltage of 35V.
It only requires ~55V, is safe, easy to handle, does not require technical skill, and is easy to automate.

(8) When this power supply device is used for welding, the firing angle of the AC sinusoidal waveform of one phase is appropriately adjusted back and forth around 60 degrees or 120 degrees in each of the power converters. By doing so, the strength of the arc can be greatly adjusted. In other words, the adjustment range can be made wider than with the conventional method of adjusting the magnetic coupling force of the primary and secondary coils, and automatic control by computer enables welding in areas that were previously impossible. ,
Moreover, it is possible to obtain welding stability.

(9) Furthermore, since it is small and lightweight and the arc is stable, it is possible to arc weld large thick plates by mounting it on a robot. That is,
It can demonstrate three times the welding capacity of conventional models with the same weight.

(10) In addition, this power supply device can simultaneously output triple-frequency single-phase outputs with three different waveforms from separate output terminals, so the work of three single-phase power supplies can be done by one.
In addition, various types of welding are possible, especially when welding using multiple electrodes.

For example, if the F, M, and B outputs described above are applied to three electrodes for generating a plurality of arcs, various arcs will be generated by gathering arcs that emit arcs in different ways.

In addition, since preheating is necessary when welding copper, the above-mentioned B output with a steep rise is applied to the leading carbon electrode, the powerful M output is applied to the next welding electrode, and then the following welding electrode is A gentle rising R on the finishing electrode
By applying power and simultaneously performing preheating, main welding, and finish welding using three electrodes, copper can be welded efficiently and easily.

[0061] This welding method is also effective when welding two members via an adhesive or when supplying metal powder as a welding material.

Furthermore, since each of the above outputs is a three-phase balanced output, there is no problem of three-phase unbalance as in the prior art.

FIG. 6 is an explanatory diagram of a power supply device according to a second embodiment of the present invention, and FIG. 7 is a diagram showing the circuit configuration of the power supply device. This embodiment differs from the above embodiment in that one of the outputs, ie, F output, M output, and B output, is selected and outputted from one output terminal.

That is, as shown in the figure, this power supply device 200 includes, in addition to the first to third power conversion units 101 to 103 having the same configuration as the first embodiment, each power conversion unit 101 to 1
03, and the output from each converter, that is, the F output,
It has an output changeover switch circuit 210 that selects one of the M output and B output and outputs it to the output terminal 201a, and further includes a control circuit 220 that controls the switching operation of the output changeover switch circuit 210. We are prepared. In addition, Figure 8
For (a), (b), and (c), 3 of the above F, M, and B are used.
An example of a control output (C output) in a case where two outputs are switched and controlled every cycle of a three-phase input is shown.

[0065] In a power supply device having such a configuration, the power output is divided into three types of F, M, and B according to the characteristics of the load to be driven.
Not only can the output be selected from two outputs, but even if the characteristics change depending on the operating state of the load, the control circuit 220 can adjust the output according to the change in the characteristics, for example, as shown in FIG.
As shown in (a), (b), and (c), it is also possible to switch and control the three outputs described above, and the utilization efficiency of the three-phase power input at the load can be made extremely good.

FIG. 9 is a diagram showing a circuit configuration of a power supply device according to a third embodiment of the present invention, and FIG. 10 is a diagram showing an example of a single-phase output waveform that can be output from the power supply device. In the figure, 30
0 is this power supply device, and input terminals 1, 2, and 3 are connected to a 3-phase AC power supply, and the supply of 3-phase AC is controlled at 0 degrees to 60 degrees and 60 degrees to 120 degrees for each positive and negative half wave of each phase. degrees or 12
A phase control circuit 310 that performs operation only in the range of 0 degrees to 180 degrees, and 3-phase primary coils 351 to 353 on the primary side.
has a single-phase iron core 350a around which a single-phase secondary coil 354 is wound on the secondary side, and the three-phase primary coils 351 to 35
3 is a transformer 350 connected to each R, S, and T phase voltage of the three-phase AC power supply via the phase control circuit 310, and the supply range of each phase is set so that the phases do not overlap each other. The arc order setting circuit 320 is also provided.

The thyristors 310a to 310c and the zero cross point detector 312 that constitute the phase control circuit 310 are the same as those shown in FIG. 3, but the phase adjusters 311a to 311c are the same as those shown in FIG. The thyristors 310a to 310 of each phase are controlled based not only on the output of the zero cross point detector 312 but also on the range setting signal of the firing order setting circuit.
It is configured to adjust the firing angle of c. In other words, each of the phase adjusters 311a to 311c is configured to be able to change the conduction range of each phase using the range setting signal.

In the power supply device having such a configuration, the supply range of the positive and negative half waves of each phase by each phase adjuster is set to 0 degrees to 60 degrees, 60 degrees to 120 degrees, or 120 degrees to 18 degrees.
By uniformly setting each phase to any one in the 0 degree range, the F output, M output, or B output can be supplied to the load as the power output. In this embodiment, the supply range setting circuit 320 sets the R phase supply range from 60 degrees to 120 degrees, and the S phase supply range from 120 degrees to 120 degrees.
By setting the T-phase supply range to 0 degrees to 60 degrees, the single-phase output (C1
output) is obtained.

Furthermore, 10(b) blocks the R phase,
The S phase supply range is 60 degrees to 120 degrees on the positive half wave, and 0 degrees to 60 degrees and 120 degrees to 180 degrees on the negative half wave, and the T phase supply range is 0 degrees to 120 degrees on the positive half wave. 60 degrees and 120 degrees ~ 1
Figure 10(c) shows the power output (C2 output) when the power supply is set to 80 degrees and the negative half wave is 60 degrees to 120 degrees. 120 degrees ~ 1
80 degrees and 60 degrees to 120 degrees for the negative half wave, and set the S phase supply range to 60 degrees to 120 degrees for the positive half wave and 0 degrees for the negative half wave.
degree to 60 degrees, and the T phase supply range to 0 degrees to 60 degrees on the negative half wave.
This is the power output (C3 output) when set to

As described above, in this embodiment, the supply range setting circuit 320 is provided, and each phase adjuster 311a to 311
c is configured so that the supply range of each phase can be set separately by the signal from the above circuit, so single-phase AC with various waveforms can be output as the power output, and the range of application to the load of the power supply device is increased. becomes larger.

FIG. 11 is a diagram showing a first modification of the third embodiment. Here, in the power supply device, in place of the transformer 350, a single-phase power supply is installed on the primary side and the secondary side, respectively. First to third transformers 360a to 36 each having a single-phase iron core 363 around which a secondary coil 361 and a secondary coil 362 are wound.
0c is provided, and the primary coil 361 of each transformer is connected to the R, S, and T phases of the three-phase alternating current via the phase control circuit 310. and the first to third transformers 360a to 36
0c constitutes a transformer section 360, and the phase control circuit 310 and the transformer section 360 constitute a power supply device 301.

In this case, by setting the supply range of the positive and negative half-waves of each phase by each phase adjuster to the range of 0 degrees to 60 degrees, the secondary side of the transformer 360a has R- The F output, that is, the power output in which the 0 to 60 degree portions of the positive and negative half waves of the sine wave appear alternately every 180 degrees is the power output of the transformer 360.
On the secondary side of b, the S-F output, that is, the power supply power with a phase delay of 120 degrees from the above-mentioned R-F output, is also connected to the transformer 360c.
, a power supply output with a phase delay of 240 degrees from the above-mentioned RF output appears.

[0073] Also, each of the above phase adjusters 311a to 311c
The supply range of the positive and negative half waves of each phase can be set separately from 60 degrees to 120 degrees or from 120 degrees to 180 degrees. In this case, the secondary output of the transformer 360a , R-M output or R-B output where 60 degrees to 120 degrees or 120 degrees to 180 degrees of each positive and negative half wave of a sine wave appear alternately every 180 degrees (see Figure 14)
On the secondary side of the transformer 360b, the above R-M output, R
- S-M output with a phase delay of 120 degrees with respect to the B output, S-
B output, and the above R-M output to the transformer 360c.
T-M output with a phase delay of 240 degrees with respect to R-B output, T
-B output can also be output.

A power supply output in which such positive and negative pulse-like waveforms appear alternately and repeatedly may also be useful depending on the characteristics of the load.

FIG. 12 is a diagram for explaining a second modification of the third embodiment, and here, in the power supply device of the first modification, each of the transformers 360a to 360 is
The only difference from the first modification is that the secondary coils 362 of c are connected in parallel.

In this case, the common output on the secondary side of each transformer is as follows:
As shown in FIG. 12, the above F output and C1 output can be output.

FIG. 13 is a diagram for explaining the circuit configuration and operation of a power supply device according to a fourth embodiment of the present invention. In the figure, 400 is the present power supply device, which is connected to a single-phase AC input. Terminal 4 and the supply of single-phase AC input in the range of 50% of the phase angle for each positive and negative half-wave, here 0 degrees to 90 degrees, 45 degrees to 135 degrees, or 90 degrees to 180 degrees.
a phase control circuit 410 that performs the operation only in one of the ranges of degrees;
It has a single-phase iron core 453 wound with a single-phase primary coil 451 and a single-phase secondary coil 452 on the primary and secondary sides, respectively, and the primary coil 451 receives single-phase AC input via the phase control circuit 410. It is comprised of a transformer 450 connected to the AC input, and a supply range setting circuit 420 that sets the supply range of the single-phase AC input from among the three ranges.

The phase control circuit 410 also includes a thyristor 411 that conducts or cuts off the single-phase AC input, a zero-crossing point detector 413 that detects the zero-crossing point of the sine wave of the single-phase AC input, and the zero-crossing point detector. The phase adjuster 412 receives the output of the thyristor 413 and adjusts the firing angle range of the thyristor 411.

In the power supply device having such a configuration, the supply range setting circuit 420 selects a predetermined firing range of the thyristor 411 by the phase adjuster 412 from the above three ranges, thereby controlling the single-phase AC input. As shown in FIG. 13, it is possible to convert and output f output, m output, or b output. Here, the f, m, and b outputs are the 0 degree to 90 degree portion of the positive and negative half waves of the sine wave, and the 45 degree to
It is a single-phase output in which 135 degree portions or 90 degree to 180 degree portions appear alternately every 180 degrees.

Single-phase output with such a waveform may also be necessary depending on the characteristics of the load.

Next, a multi-arc generator will be described as a further embodiment of the present invention. Figure 14 is a diagram showing the circuit configuration of the power supply device installed in the multi-arc generator, and Figure 15
FIG. 2 is a diagram showing the multi-arc generating section of the multi-arc generating device, particularly regarding the arrangement of arc electrodes.

In FIG. 14, 500 is a power supply device mounted on the multi-arc generator, which has input terminals 1, 2, and 3 connected to a three-phase AC power supply, and three phases (R, S, and T phases).
A first power converter 501 that separately outputs the 0 degree to 60 degree portions of the positive and negative half-waves from three output terminals 501a to 501c for each phase, and the positive, Three output terminals 502 for each phase from 60 degrees to 120 degrees of each negative half wave.
The second power converter 50 outputs separately from a to 502c.
2, and 60 degrees to 12 of each positive and negative half wave of the above R, S, and T phases.
Three output terminals 503a to 503c for each phase at 0 degree portion
and a third power conversion unit 503 that separately outputs power from the power converter.

The first power conversion section 501 includes phase control circuits 510 and 3 having the same configuration as the phase control circuit shown in FIG.
It consists of two single-phase transformers 550a to 550c, and the primary coil 551 of each transformer is connected to the phase control circuit 51.
0 to the R, S, and T phases of the three-phase AC input. In this first power conversion section 501, the first
The phase control circuit 510 is set to supply three-phase AC input only in the range of 0 degrees to 60 degrees for each positive and negative half wave of each phase, and each transformer 550a to 550c supplies the above-mentioned AC input. RF output, SF output, and TF output can be obtained.

[0084] Furthermore, the second and third power conversion sections 502,
503 as well as the first power conversion unit 501,
second and third phase control circuits 520 and 530, respectively;
Three single-phase transformers 560a-560c, 570a-57
0c, but in the second power conversion section,
The second phase control circuit 520 is set to supply three-phase AC input only in the range of 60 degrees to 120 degrees for each positive and negative half-wave of each phase, and each of the transformers 560a to 560c The above-mentioned R-M output, S-M output, and T-M output are output, and the third power conversion section 530
In this case, the third phase control circuit 530 is set to supply three-phase AC input only in the range of 60 degrees to 120 degrees for each positive and negative half wave of each phase, and each transformer 570a to 570c is
From there, an R-B output, an S-B output, and a T-B output are output.

Further, in FIG. 15, 580 is a multi-arc generating section of the multi-arc generating device, which has one neutral electrode 580a and first to ninth arc electrodes 581 to 589 for generating arcs. There is. The tips of these nine arc electrodes 581 to 589 are 1
They are arranged sequentially in a certain direction, in this case clockwise, so that they are located on the vertices of two regular nonagons, and the first to third
The arc electrodes are grouped into a first group G1, the fourth to sixth arc electrodes are grouped into a second group G2, and the seventh to ninth arc electrodes are grouped into a third group G3. Then, the T-B output, R-F output, and S-M output are applied to the first to third arc electrodes 581 to 583, respectively, and the S-B output is applied to the fourth to sixth arc electrodes 584 to 586, respectively. , T-F output, and R-B output, and the seventh to ninth arc electrodes 58
7 to 589, the R-B output, SF output, and TM output are applied.

Next, the operation will be explained. The three-phase AC power applied to the input terminals 1, 2, and 3 of the power supply device 500 is converted into single-phase AC power for each phase in the first to third power conversion units 501 to 503, and The power is applied to the first to ninth arc electrodes 581 to 589 as described above via the transformers of the first to third power conversion units 501 to 503. At this time, R- applied to the arc electrodes of the first group G1
F output, S-F output, T-F output, second group G2
S-B output, T-F output, R applied to the arc electrode of
-M output, and the T-M output, S-F output, and R-B output applied to the arc electrodes of the third group G3, simultaneously within the group and sequentially in the order of the first, second, and third groups. Generates voltage. Therefore, multi-arcs are generated between the three arc electrodes of each group in the order of the first, second, and third groups, and the multi-arc itself consisting of the three arcs is centered on the neutral electrode 580a in the direction of the arrow Ar. It will rotate to .

As described above, in this embodiment, the multi-arc rotates, and arcs can be generated with the generation of a strong rotating magnetic field, making it easy to perform arc treatment on extremely large objects. It is extremely useful in welding and thermal spraying.

FIG. 16 is a circuit diagram of a power supply device installed in an arc generator according to a sixth embodiment of the present invention, and FIG. 17 is a diagram showing the arc generating section of the arc generator, particularly regarding the electrode arrangement.

In this embodiment, as shown in FIG. 16, in the first power converter 501 of the fifth embodiment, the first to third transformers corresponding to the R, S, and T phases of the three-phase AC input are Vessel 5
50a-550c, the secondary coil 55 of each transformer
2, and an additional secondary coil 682 that is magnetically coupled to the additional primary coil 681 through a single-phase iron core 683. First to third additional transformers 680a to 680c are provided, respectively, which generate high voltages on the secondary side due to falling changes. As a result, on the secondary sides of the first, second, and third additional transformers 680a to 680c, the voltages shown in FIGS.
c) As shown in the figure, the high voltage R-F additional output, S-F
Additional output and TF additional output are output.

Also, in the second power converter 502, the first to third transformers 560a to 560c have the same configuration as that of the first power converter.
Third additional transformers 690a to 690c are provided, and the secondary sides of the first to third additional transformers 690a to 690c are as shown in FIG.
As shown in 9(a) to (c), the high voltage R-M additional output, S-M additional output, and T-M are generated around 120 degrees of each positive and negative half-wave of the R phase, S phase, and T phase, respectively. I am trying to output additional output. Note that the configuration of the third power conversion section 503 is completely the same as that of the fifth embodiment.

Regarding the arc generating section 580, see FIG.
As shown in 7, in addition to the first to ninth arc electrodes 581 to 589 for generating the arc, the tips thereof are connected to the first, third, fourth, sixth, seventh, and ninth arc electrodes, respectively. The first power conversion unit 50 includes first to sixth auxiliary electrodes 681 to 686 arranged near the tip of the arc electrode.
The R-F additional output, S-F additional output, and T-F additional output of 1 are connected to the fourth, second, and sixth auxiliary electrodes 684 and 682, respectively.
, 686 and R- of the second power converter 502.
The M additional output, the S-M additional output, and the T-M additional output are connected to the fifth, third, and first auxiliary electrodes 685, 683, and 681, respectively.
I am trying to apply it to Note that the arc electrode 58
Nos. 1 to 589 are connected to the secondary output of the transformer of each power conversion section, just as in the fifth embodiment.

Next, the operation will be explained. In this embodiment as well, as in the fifth embodiment, the three-phase AC input is phase-controlled for each phase in each of the power conversion units 501 to 503, so that the three-phase AC input has different waveforms or voltage generation timings.
each of the first group G1
arc electrodes 581 to 583 of the second group G2, arc electrodes 584 to 586 of the second group G2, and arc electrodes 587 to 589 of the third group G3. Then, multi-arcs are generated between the three arc electrodes of each group in the order of the first, second, and third groups, and the multi-arc itself consisting of the three arcs moves around the neutral electrode 580a in the direction of arrow Ar. It will rotate.

At this time, in this device, the secondary sides of the first to third additional transformers 680a to 680c of the first power conversion section 501 are provided with power converters as shown in FIGS. 18(a) to 18(c), respectively. In the vicinity of the falling edge of the R-F output, S-F output, and T-F output, high-voltage R-F additional output, S-F additional output,
A T-F additional output is generated, and the second power converter 502
As shown in FIGS. 19(a) to 19(c), the secondary sides of the fourth to sixth additional transformers 690a to 690c have RM output, S-M output, and TM output, respectively. Near the falling edge, high voltage R-M additional output, S-M additional output, T-M
Additional output occurs. and the first to sixth additional transformers 680a, 680b, 680c, 690a, 690b.
, 690c are the fourth, second, sixth, fifth, and
Third and first auxiliary electrodes 684, 682, 686, 685
, 683, 681, so that just before the generation of multi-arcs in one group stops, a strong spark is generated in the auxiliary electrode of the group that will generate multi-arcs next. As a result, multi-arcs are generated while rotating smoothly around the neutral electrode.

As described above, in this embodiment, high voltage is generated by a sudden fall change in the secondary side output of each transformer of the first and second power converters 501 and 502. Additional transformers 680a to 680c, 690
Since voltages a to 690c are provided, three-phase alternating current energy can be used more effectively by supplying this high voltage to the load. Moreover, an auxiliary electrode is provided near the arc electrode,
The outputs and auxiliary transformers of each of the above-mentioned additional transformers are adjusted so that, immediately before the generation of multi-arcs in one group of arcing electrodes stops, an instantaneous high voltage is applied to the auxiliary electrodes of the group that will generate multi-arcs next. Since the electrodes are connected, the spark between the auxiliary electrodes can cause dielectric breakdown in the next arc generation area immediately before the arc stops in the current arc generation area, thereby preventing the zero cross of the main transformer output. This has the effect of preventing arc interruption at points and making it easier to generate arcs.

FIG. 20 is a diagram for explaining a power supply device according to a seventh embodiment of the present invention, and FIG. 21 is a diagram showing a circuit configuration of the power supply device. In the figure, 700 is a power supply device;
Connected to a 3-phase AC input, the 3-phase AC input consisting of R, S, and T phases is connected to the R, S, T phase and its opposite phase R', S', T'
a three-phase/six-phase conversion circuit 710 that converts into six-phase AC power consisting of three phases, first to third power conversion units 701 to 703 that receive the R, S, and T phases as input, and the R′, S It is comprised of fourth to sixth power converters 704 to 706 which receive the ' and T' phases as inputs. Here, the above R, T', S, R',
The T and S' phases correspond to the first to sixth phases of the six-phase alternating current, respectively.

[0096] The first to third power converters 701 to 70
3 are phase control circuits 710 to 730 and transformers 710a to 730a, respectively, having the same configuration as those of the first embodiment.
The R, S, and T phases are supplied from the secondary side of each transformer by controlling the supply in the ranges of 0 degrees to 60 degrees, 60 degrees to 120 degrees, and 120 degrees to 180 degrees by phase control circuits. The above-mentioned single-phase F output, single-phase M output, and single-phase B output are output. In addition, the fourth to sixth power conversion units 704
-706 also include phase control circuits 740-760 and transformers 740a-76 having the same configuration as the first to third power conversion units.
The R', S', and T' phases are controlled by phase control circuits in the ranges of 0 degrees to 60 degrees, 60 degrees to 120 degrees, and 120 degrees to 180 degrees, respectively. From the secondary side of the above single-phase F' output, single-phase M' output, single-phase B'
It is designed to output the output. These single-phase outputs have a reverse phase relationship with the single-phase F output, single-phase M output, and single-phase B output, respectively. Note that 771 to 773 are three-phase primary coils wound around the primary side of the single-phase iron core 775 of each transformer, and 774 is a secondary coil wound around the secondary side of the single-phase iron core 775. It is.

Next, the operation will be explained. As shown in Figure 22, the 3-phase AC input is
The R, S, and T phases are converted to phase alternating current, and the R, S, and T phases are sent to the first to third power converters 701 to 703, and the R', S', and T' phases are sent to the fourth to sixth power converters 704 to 703. 706. In the first power conversion unit 701, as shown in FIG.
As shown in the figure, the positive and negative half waves of the R, S, and T phases range from 0 degrees to 60 degrees.
In the second power conversion unit 702, as shown in FIG. 23(b)
As shown in the figure, each positive and negative half wave of R, S, and T phases is 60 degrees or more.
In addition, the third power converter 703 performs supply control in the range of 120 degrees to 180 degrees for each positive and negative half wave of the R, S, and T phases, as shown in FIG. 23(c). As a result, each power converter outputs an F output, an M output, and a T output as shown in FIGS. 23(a) to 23(c).

[0098] Also, the fourth to sixth power converters 704 to 70
6, the positive and negative half-waves of the R', S', and T' phases are 0 degrees to 60 degrees, 6 as shown in FIGS. 23(d) to (f), respectively.
Supply control is performed in the ranges of 0 degrees to 120 degrees and 120 degrees to 180 degrees. As a result, from each power converter,
) to (f), F' outputs, M' outputs, and B' outputs having opposite phases to the F outputs, M outputs, and B outputs are output, respectively.

In this embodiment having such a configuration, a 3-phase/6-phase conversion circuit 70 converts 3-phase AC power into 6-phase AC power.
0a, and converts each of the positive three-phase component consisting of the first, third, and fifth phases of the six phases, and the negative three-phase component consisting of the second, fourth, and sixth phases, that is, the The positive and negative half-waves of a sine wave of one phase are decomposed into three pulse-like waveforms at the front, middle, and rear, and the same pulse-like waveforms are combined using a transformer to generate three types of triple-frequency waves. Since the process of converting to single-phase AC is performed, three-phase AC input can be converted into three types of triple-frequency single-phase AC with different waveforms,
In other words, in addition to the F, M, and B outputs, it is possible to obtain single-phase AC having a phase opposite to each single-phase AC, that is, F', M', and B' outputs.

[0100] If such six single-phase outputs are applied to the six electrodes for multi-arc generation, each output is completely independent, so a stable arc can be obtained, and the characteristics of the arc can be determined by adjusting the characteristics of each output. It can be made into a relaxing product with a mixture of characteristics.

FIG. 24 is an explanatory diagram of a power supply device according to the eighth embodiment of the present invention, and FIG. 25 is a waveform diagram for explaining the operation of the power supply device. This power supply device is the third power supply shown in Figure 9.
This is a modification of the three-phase input power supply device of the embodiment to a six-phase input power supply device.

In the figure, 800 is a power supply device having terminals 1, 2, and 3 that are connected to a 3-phase AC power supply. /6-phase conversion circuit 810; a phase control circuit 820 that controls the supply of each phase of 6-phase AC within a predetermined phase angle range;
It has a single-phase iron core 838 in which six-phase primary coils 831 to 836 are wound on the primary side and a single-phase secondary coil 837 is wound on the secondary side. A transformer section 830 is connected to each phase voltage of a three-phase/six-phase conversion circuit 810 via a phase control circuit 820.

[0103] Here, the phase control circuit 820 has the above-mentioned 6
Thyristor 821a that fires the first to sixth phases of phase current
~821f, a detector 812 that detects the zero cross point of each phase of the six-phase alternating current, and the thyristors 821a~821.
Phase adjusters 811a to 811 that fire f within a predetermined range
d, and a setting circuit 822 that sets the thyristor firing range and operation order of the phase adjuster.

[0104] In the power supply device having such a configuration, the first
- Set the firing range of each positive and negative half wave of the R, S, and T phases by the third phase adjuster to either 0 degrees to 60 degrees, 60 degrees to 120 degrees, or 120 degrees to 180 degrees. By uniformly setting for each phase and cutting off the R', S', and T' phases, the F output, M output, or B output can be supplied to the load as the power output.

Furthermore, this device can output the C1 output, C2 output, and C3 output shown in FIGS. 25(a) to (c) using the R, S, and T phases in the same manner as in the third embodiment. In addition, in the case of Fig. 25(a), instead of the R phase, the R' phase is
In the case of Fig. 25(b), the positive half wave of the T' phase is substituted for the negative half wave of the T phase, and in the case of Fig. 25(c), the negative half wave of the R phase and the positive half wave of the S phase are used. In place of the wave, the positive half wave of the R' phase and the S'
25(d)~ by using the negative half-wave of the phase, respectively.
It is possible to obtain C4, C5, and C6 outputs with waveforms shown in 25(f).

As described above, in this embodiment, the setting circuit 822 is provided, and each phase adjuster is configured so that the firing range of each phase can be set separately by the signal from the circuit.
Single-phase AC with various waveforms can be output as a power output, increasing the range of applications for the power supply device's loads.

Further, FIG. 26(a) is a configuration diagram for explaining a modification of the eighth embodiment, and here, the above-mentioned structure in which a six-phase primary coil is wound around the primary side of a single-phase iron core is shown. Instead of the transformer 830, a first single-phase iron core 830a1 has six primary coils 831 to 836 wound around its primary side and a single-phase secondary coil 837a wound around its secondary side. The transformer 830a and the remaining three six-phase primary coils are wound around the primary side of the second single-phase iron core 830b, and the single-phase secondary coil 837b is wound around the secondary side of the second single-phase iron core 830b. 2 transformers 830b are used, and the secondary sides of each transformer are connected in series.

[0108] In a power supply device having such a configuration, by outputting two single-phase outputs of the same waveform and opposite phases, for example, F output and F' output, to the secondary coil of each transformer,
As shown in FIG. 26(b), a doubled voltage output is obtained.

[0109]

As described above, according to the power supply device according to the present invention, the three-phase AC input is
A first power converter that converts the three-phase AC input into a first single-phase AC that consists of a 60-degree part, and a second unit that converts the three-phase AC input into a 60-degree to 120-degree part of the positive and negative half waves of each phase. a second power conversion unit that converts the three-phase AC into a phase AC, and a third power conversion unit that converts the three-phase AC into a third single-phase AC consisting of a 60-degree to 120-degree portion of each positive and negative half-wave of each phase. This makes it possible to use the above three types of single-phase AC depending on the characteristics of the load, improving the efficiency of power usage at the load. By using the outputs simultaneously, one unit can do the work of three single-phase power supplies.

[0110] Furthermore, since an output switching means for switching and outputting the first to third single-phase outputs based on the control signal is provided, even if the load characteristics change over time due to operating conditions, etc. By switching the power supply output in accordance with changes in load characteristics, it is possible to always optimize the power usage efficiency at the load.

[0111] Furthermore, according to the power supply device according to the present invention, 3
Phase AC input for each phase of the positive and negative half-waves of the sine wave from 0 degrees to 60 degrees, 60 degrees to 120 degrees, or 120 degrees to
In addition to providing a phase control circuit that can supply any range within a 180 degree range, a three-phase primary coil that receives the phase control output of each phase, and a single coil that is magnetically coupled to this through a single-phase iron core are provided. A transformer having a secondary coil for each phase is installed, and the supply range of each phase by the above-mentioned phase control circuit is set so that each phase does not overlap, so that the sine wave of each phase of the 3-phase AC input is It is possible to decompose each positive and negative half-wave into three pulse-like waveforms: front, middle, and rear, and further output the three types of pulse-like waveforms as a single-phase alternating current by arranging them in a desired order. can. This has the effect of allowing fine control of the waveform of the power output.

[0112] Also, instead of the above transformer, a single-phase transformer is used.
Since each primary coil was connected to each phase of the three-phase AC input via the phase control circuit, the front and middle parts of the sine wave were connected to the secondary side of the transformer for each transformer. , the rear pulse wave can be output discretely, and single-phase output with a waveform different from the above is possible. Such an output may also be effective depending on the load.

Furthermore, by connecting the secondary sides of each transformer in parallel, it is possible to output triple-frequency single-phase AC in which three types of pulse waveforms appear in a predetermined order, similar to the above.

Furthermore, according to the power supply device according to the present invention,
A phase control circuit is provided that supplies single-phase AC input only to a predetermined portion corresponding to 50% of the phase angle of each positive and negative half-wave, and outputs the phase control output via a single-phase transformer. Therefore, predetermined portions of each positive and negative half-wave of the sine wave of the single-phase AC input can be output as discrete pulse-like waves to the secondary side of the single-phase transformer, and the output of such a waveform is It may be valid.

[0115] According to the power supply device according to the present invention, the first power converter section outputs each phase of the three-phase AC input separately in the range of 0 degrees to 60 degrees of each positive and negative half wave; A second power converter that outputs each phase of the phase AC input separately in the positive and negative half-wave range of 60 degrees to 120 degrees, and a second power converter that outputs each phase of the three-phase AC input separately in the positive and negative half-wave range. Since it is equipped with a third power converter that outputs separately in the range of 120 degrees to 180 degrees, the sine waves of the first phase, second phase, and third phase of the three-phase AC input are Each half wave is decomposed into three types of pulse waveforms: front, middle, and rear, and as a result, nine types of single-phase outputs with different waveforms or voltage generation timings can be obtained. In this case, special effects can be obtained by separately supplying nine types of single-phase outputs to a plurality of input terminals of the load.

[0116] Furthermore, for each of the transformers of the first and second power conversion sections, an additional transformer is provided that generates a high voltage due to a sudden fall change in the secondary output of the transformer. By supplying high voltage to the load, three-phase AC energy can be used more effectively, and
This has the effect of compensating for the power drop near the zero-crossing points of the nine single-phase outputs.

Further, according to the power supply device according to the present invention, the power supply device is mounted which generates nine single-phase outputs by the first to third power converters, respectively, and the first to third power converters for generating an arc are mounted. The ninth arc electrode is sequentially arranged in a fixed direction so that its tip is located on the vertex of one regular nonagon, and the first to third arc electrodes, the fourth to sixth arc electrodes, and the seventh - the ninth arc electrode is connected to the first, second, and ninth arc electrodes, respectively.
As a third group, all the outputs of the first, second, and third power converters, that is, nine single-phase outputs, are applied to the arc electrode of the same group, where the three outputs generate voltage at the same timing. Since the three arcs are assigned to the nine arc electrodes as described above, three arcs are generated sequentially in each group, and there is an effect that the three arcs can be rotated and emitted powerfully.

Furthermore, according to the power supply device according to the present invention,
It is equipped with a power supply device that generates the nine single-phase outputs and six additional outputs, and in addition to the first to ninth arc electrodes, first to sixth auxiliary electrodes are installed in each group of the arc electrodes. For the nine single-phase outputs, these are assigned to the nine arc electrodes in the same way as above, and for the six additional outputs, they are assigned to two outputs that generate high voltages with different polarities at the same timing. Since the two additional outputs are assigned to the six auxiliary electrodes so that they are applied to the auxiliary electrodes in the same group of the arc electrodes, it is possible to prevent arc interruption at the zero cross point of the nine outputs due to sparks between the auxiliary electrodes. It is possible to cause dielectric breakdown in the area where the arc occurs, and has the effect of making it easier to generate the arc.

[0119] According to the power supply device according to the present invention, the power supply device includes a 3-phase/6-phase conversion circuit that converts 3-phase AC input into 6-phase AC power; Naru positive phase 3
For each of the phase components and the negative phase three-phase components consisting of the second, fourth, and sixth phases, the positive and negative half-waves of the three phases are
Since the 3-phase AC input is converted into 1st, 2nd, and 3rd single-phase AC consisting of 60 degrees, 60 degrees to 120 degrees, and 120 degrees to 180 degrees, the 3-phase AC input can be converted into 3 types of AC input with different waveforms. In addition to double-frequency single-phase alternating current, there is an effect that single-phase alternating current with a phase opposite to each single-phase alternating current can be obtained.

According to the power supply device according to the present invention, a 3-phase/6-phase conversion circuit is provided for converting 3-phase AC input into 6-phase AC power, and each phase of the 6-phase AC is converted into positive and negative signals of each phase. Supply range setting means includes a phase control circuit capable of supplying each half wave in any one of the ranges of 0 degrees to 60 degrees, 60 degrees to 120 degrees, or 120 degrees to 180 degrees, and sets the supply range of each phase. The voltage of each phase is output through a transformer with a 6-phase primary coil and a single-phase secondary coil, so the sine waves of each phase of 6-phase AC are Each half-wave is decomposed into three types of pulse-like waveforms: front, middle, and rear, and these three types of pulse-like waveforms are further arranged in a desired order to generate triple-frequency single-phase AC or the single-phase It has the effect of being able to output as single-phase alternating current, which has a phase opposite to alternating current.

[0121] Further, according to the power supply device according to the present invention, the above-mentioned three-phase/six-phase conversion circuit, the above-mentioned phase control circuit, and the above-mentioned supply range setting means are provided, and a three-phase primary coil and a single-phase primary coil are connected to each other. The first coil has a secondary coil magnetically coupled by a single-phase iron core.
, a second transformer, the secondary side of each transformer is connected in series, and for the 6-phase 1st, 3rd, and 5th phases, these are connected to the 1st transformer.
The 6-phase 2nd, 4th, and 6th phases are outputted through the second transformer, so the 1st, 3rd, and 5th phases and these By making the supply ranges of the fourth, sixth, and second half-waves, which have substantially opposite phase relationships, the same supply range, it is possible to obtain a single-phase alternating current with a frequency three times the voltage doubler.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram for explaining a power supply device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a circuit configuration of the power supply device.

FIG. 3 is a diagram showing the configuration of a phase control circuit used in three power converters of the power supply device.

FIG. 4 is a waveform diagram for explaining the operation of the phase control circuit of each power conversion unit.

[Figure 5] Waveforms in which the positive and negative half waves of each phase (R phase, S phase, T phase) of the three-phase AC input input to the above power supply device are divided into three parts: front, middle, and rear. FIG.

FIG. 6 is a schematic diagram for explaining a power supply device according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a circuit configuration of the power supply device.

FIG. 8 is a diagram for explaining an output waveform of the power supply device.

FIG. 9 is a diagram showing a circuit configuration of a power supply device according to a third embodiment of the present invention.

FIG. 10 is a diagram for explaining an output waveform of the power supply device.

FIG. 11 is a diagram showing a first modification in which the configuration of the transformer section of the power supply device is changed in the third embodiment.

FIG. 12 is a diagram showing a second modification in which the secondary sides of three transformers of the first modification of the third embodiment are connected in parallel.

FIG. 13 is a diagram for explaining the configuration and operation of a power supply device according to a fourth embodiment of the present invention.

FIG. 14 is a circuit configuration diagram for explaining a power supply device of an arc generator according to a fifth embodiment of the present invention.

FIG. 15 is a diagram showing the arrangement of electrodes in the arc generating section of the arc generating device.

FIG. 16 is a circuit configuration diagram for explaining a power supply device of an arc generator according to a sixth embodiment of the present invention.

FIG. 17 is a diagram showing the arrangement of electrodes in the arc generating section of the present arc generating device.

[Figure 18] The first power supply device installed in this arc generator
FIG. 3 is a diagram showing an output waveform of the power conversion unit of FIG.

[Figure 19] The second power supply device installed in this arc generator
FIG. 3 is a diagram showing an output waveform of the power conversion unit of FIG.

FIG. 20 is a schematic diagram for explaining a power supply device according to a seventh embodiment of the present invention.

FIG. 21 is a diagram showing the circuit configuration of this power supply device.

FIG. 22 is a waveform diagram for explaining the operation of a 3-phase/6-phase conversion circuit installed in the power supply device.

FIG. 23 is a diagram showing an output waveform of the power supply device of the seventh embodiment.

FIG. 24 is a diagram showing a circuit configuration of a power supply device according to an eighth embodiment of the present invention.

FIG. 25 is a diagram showing an example of an output waveform of the power supply device.

FIG. 26 is a diagram for explaining a modification in which the transformer section of the power supply device of the eighth embodiment is changed.

[Explanation of symbols]

1, 2, 3 3-phase input terminal 100 to 800, 301, 302 Power supply device 10
1~103,501~503,701~706
Power conversion unit 110-130, 310, 410, 510-530, 7
10~760,820 phase control circuit 150~170,350,360,450,550~5
70, 710a-760a, 830, 830a, 830
b Transformer section 210 Output changeover switch circuit 220 Control circuit 320, 420 Supply range setting circuit 581 to 58
9 Arc electrodes 680a-680c, 690a-690c Additional transformers 681-686 Auxiliary electrodes 700a, 810 3-phase/6-phase conversion circuit 822
Setting circuit

Claims (13)

[Claims] Claim 1: A first phase control circuit that supplies three-phase AC input only in the range of about 0 degrees to 60 degrees among the positive and negative half waves of each phase, and a three-phase primary circuit on the primary side. The coil has a single-phase iron core around which a single-phase secondary coil is wound on the secondary side, and one of the three phases
a first power conversion section that outputs a first single-phase AC, and a first power conversion section that outputs a first single-phase AC, and supplies the three-phase AC input; It has a second phase control circuit that performs this only in the range of about 60 degrees to 120 degrees among the positive and negative half waves of each phase, and a single-phase iron core with the same configuration as the above transformer, and a three-phase primary coil. a transformer section connected to the three-phase AC input via the second phase control circuit, a second power conversion section that outputs the second single-phase AC, and a second power converter that outputs the second single-phase AC input; Approximately 120 degrees to 1 of each positive and negative half wave of the phase
It has a third phase control circuit that operates only in a range of 80 degrees and a single-phase iron core having the same configuration as the above-mentioned transformer section, and the three-phase primary coil receives three-phase AC input via the third phase control circuit. and a third transformer connected to the transformer, which outputs a third single-phase
A power supply device comprising: a power conversion unit. 2. The power supply device according to claim 1, wherein the power supply device is connected to the output terminals of the first to third power converters, and outputs one of the first to third single-phase outputs based on a control signal. A power supply device comprising output switching means for selectively outputting. [Claim 3] Each phase of the three-phase AC input is set at approximately 0 degrees to 60 degrees and approximately 60 degrees to 1 degree for each positive and negative half wave of each phase, respectively.
A phase control circuit that can supply either 20 degrees or approximately 120 degrees to 180 degrees, a 3-phase primary coil wound on the primary side, and a single-phase secondary coil wound on the secondary side. A transformer has a single-phase iron core, and the three-phase primary coil is connected to each phase voltage of the three-phase AC power supply via the phase control circuit, and the supply range of each phase by the phase control circuit is 1. A power supply device comprising supply range setting means for setting a supply range so that phases do not overlap. 4. The power supply device according to claim 3, wherein the transformer is replaced by a single-phase transformer formed by winding single-phase primary and secondary coils around the primary and secondary sides of a single-phase iron core, respectively. A power supply device characterized in that three transformers are provided, and the primary coils of these single-phase transformers are connected to each phase of a three-phase AC input via the phase control circuit. 5. The power supply device according to claim 4, wherein the secondary coils of each of the single-phase transformers are connected in parallel. [Claim 6] Single-phase AC input for each positive and negative half wave: 0 degrees to 90 degrees, 45 degrees to 135 degrees, or 90 degrees to 1
a phase control circuit that can be supplied in any range of 80 degrees;
Single-phase primary and secondary on the primary and secondary sides of the single-phase iron core, respectively.
A transformer is formed by winding a secondary coil, and the primary coil is connected to a single-phase AC input via the phase control circuit, and a supply range of the single-phase AC input is set from among the three ranges described above. A power supply device comprising supply range setting means. 7. A first phase control circuit that supplies three-phase AC input only in the range of about 0 degrees to 60 degrees for each positive and negative half-wave of each phase, and a first and second phase control circuit of a single-phase iron core. Single-phase primary and secondary coils are wound on each side, and each primary coil is connected to the first three-phase AC input via the phase control circuit.
The first, second, and third transformers are connected to the first, second, and third phases, and the first, second, and third transformers are connected to the secondary sides of the first, second, and third transformers, respectively. A first power converter that outputs the second and third phases only in the range of 0 degrees to 60 degrees, and supplies three-phase AC input in the range of 60 degrees to 120 degrees for each half wave on the positive and negative sides of each phase. and a fourth, fifth, and sixth transformer having the same configuration as the transformer of the first power converter, and the fourth, fifth, and , a second power converter that outputs the first phase, second phase, and third phase only in the range of 60 degrees to 120 degrees, and a 3-phase AC input supply to the secondary side of the sixth transformer. A third phase control circuit that performs positive and negative half waves of each phase only in the range of 120 degrees to 180 degrees, and seventh, eighth, and ninth phase control circuits having the same configuration as the transformer of the first power conversion section transformer, and outputs the first phase, second phase, and third phase to the secondary sides of the seventh, eighth, and ninth transformers, respectively, only in the range of 120 degrees to 180 degrees. 3. A power supply device comprising a power conversion section. 8. In the first power conversion unit, for each of the first, second, and third transformers corresponding to the first phase, second phase, and third phase of the three-phase AC input, each of the transformers is It has a second primary coil connected in series to the secondary coil of the device, and a second secondary coil magnetically coupled to the primary coil through a single-phase iron core, and the primary side current An additional transformer is provided that generates a high voltage on the secondary side due to a sudden fall change in the voltage.
A high voltage is additionally output at a phase angle of around 60 degrees for each positive and negative half-wave of the phase, and the second power converter corresponds to the first, second, and third phases of three-phase AC. 1st, 2nd,
For each of the third transformers, an additional transformer having the same configuration as the additional transformer of the first power converter is provided, and the secondary side of each of the additional transformers has the first phase, second phase, Positive of the third phase,
8. The power supply device according to claim 7, wherein the high voltage is additionally output at a phase angle of about 120 degrees of each negative half wave. 9. An arc generating device equipped with the power supply device according to claim 7, wherein the arc generating device is arranged sequentially in a certain direction so that the tip portion is located on the vertex of one regular nonagon. the first to ninth arc electrodes, and applies the first phase output, second phase output, and third phase output of the first power converter to the second, eighth, and fifth arc electrodes, respectively The first phase output, second phase output, and third phase output of the second power converter are applied to the sixth, third, and ninth arc electrodes, respectively, and the third power converter An arc generator characterized in that a first phase output, a second phase output, and a third phase output are applied to the seventh, fourth, and first arc electrodes, respectively. 10. An arc generating device equipped with a power supply device according to claim 8, wherein the arc generators are arranged sequentially in a certain direction so that their tips are located on the apexes of one regular nonagon. The first to ninth arc electrodes and their tips are the first, third, fourth, sixth, seventh, and ninth arc electrodes, respectively.
The first arc electrode is located near the tip of the main arc electrode.
- a sixth auxiliary electrode, and the first phase output, second phase output, and third phase output of the first power conversion section are respectively connected to the second
, to the eighth and fifth arc electrodes, and the first phase output, second phase output, and third phase output of the second power converter to the sixth, third, and ninth arc electrodes, respectively. and apply the third
The first phase output, second phase output, and third phase output of the power converter are applied to the seventh, fourth, and first arc electrodes, respectively, and the first phase output of the first power converter is applied to the seventh, fourth, and third arc electrodes, respectively. output, 2nd phase additional output, and 3rd phase additional output to the 4th, 2nd,
is applied to the sixth auxiliary electrode, and the first
An arc generating device characterized in that a phase additional output, a second phase additional output, and a third phase additional output are applied to fifth, third, and first auxiliary electrodes, respectively. 11. A 3-phase/6-phase conversion circuit that converts 3-phase AC input into 6-phase AC power;
, a phase control circuit that controls the supply of the fifth phase, a three-phase primary coil wound around the primary side of a single-phase iron core, and a single-phase secondary coil wound around the secondary side of the single-phase iron core. The primary coil has a transformer connected to each of the above phases via the first phase control circuit, and the secondary side of the transformer has 0 to 100% of each of the positive and negative half waves of the three phases. It has a first power conversion section that outputs a first single-phase alternating current consisting of 60 degrees, a phase control circuit and a transformer having the same configuration as that of the first power conversion section, and a transformer on the secondary side of the transformer. a second power conversion unit that outputs a second single-phase AC consisting of 60 to 120 degrees of positive and negative half waves of the first, third, and fifth phases;
It has a phase control circuit and a transformer having the same configuration as that of the first power converter, and the first, third, and fifth
A third power conversion unit that outputs a third single-phase AC consisting of positive and negative half-waves of 120 to 180 degrees, and controls the supply of the second, fourth, and sixth phases of the six-phase AC. a phase control circuit;
It has a transformer with the same configuration as that of the first power conversion section, and the secondary side of the transformer has 0 to 100% of each of the positive and negative half waves of the three phases.
A fourth power converter that outputs a fourth single-phase alternating current consisting of 60 degrees, and a phase control circuit and a transformer having the same configuration as those of the fourth power converter, and a secondary side of the transformer. a fifth power converter that outputs a fifth single-phase alternating current consisting of 60 to 120 degrees of positive and negative half-waves of the second, fourth, and sixth phases; and the fourth power converter. It has a phase control circuit and a transformer having the same configuration as the above-mentioned second, fourth, and
A power supply device comprising: a sixth power conversion section that outputs a sixth single-phase alternating current consisting of 120 to 180 degrees of positive and negative half-waves of the sixth phase. 12. A 3-phase/6-phase conversion circuit that converts 3-phase AC input into 6-phase AC power; A phase control circuit that can only be supplied in the range of 60 degrees to 120 degrees or 120 degrees to 180 degrees, a 6-phase primary coil on the primary side of a single-phase iron core, and a single-phase coil on the secondary side. a transformer formed by winding a secondary coil, and in which the six-phase primary coil is connected to each phase voltage of a three-phase/six-phase conversion circuit via the phase control circuit;
A power supply device comprising supply range setting means for setting a supply range of each phase by the phase control circuit. 13. The power supply device according to claim 12, wherein, in place of the transformer, a three-phase primary coil is provided on the primary side of the first single-phase iron core, and a single-phase secondary coil is provided on the secondary side of the first single-phase iron core. a first transformer section in which the three-phase primary coil is connected to the first, third, and fifth phases of the six-phase alternating current through the phase control circuit; A three-phase primary coil is wound on the primary side of a single-phase iron core, and a single-phase secondary coil is wound on the secondary side.
A power source characterized in that the three-phase primary coil is provided with a second transformer section connected to the second, fourth, and sixth phases of the six-phase alternating current through the phase control circuit. Device.