JPS58218376A - Output controller of welding machine - Google Patents

Abstract

PURPOSE:To simplify structure and facilitate assembling work by assembling semiconductor rectifiers, semiconductor switching elements, a circulation diode and a switching element constituting the titled controlling device for driving on two or less cooling fins. CONSTITUTION:The first and scond semiconductor rectifiers 10a-10c, 12a-12c having anodes and cathodes soldered in common and a circulation diode 12d are attached on the surface of bases 46, 48 made of conductor. Semiconductor switching elements 14a-14c and a switching element 16 for driving are attached on the surface of bases 50, 52 respectively. Further, connecting conductors 26, 28, 30 are provided, and the cathode of the diode 12d is connected to the emitter of the element 14 through a conductor 57, and the emitter of the element 16 is connected to the base of the element 14 by conductors 54, 58. Insulating plates 46, 62, 64, 66 are soldered between bases 44, 48, 50, 52, plates 56 and the cooling fin 42.

Description

[Detailed description of the invention] The present invention relates to an output controller of a welding machine, especially a semiconductor rectifier,
One or more semiconductor switching elements connected in series to the output end of the semiconductor rectifier, a freewheeling diode P having one end connected to the output side of the semiconductor switching element, and driving the semiconductor switching element. The present invention relates to an output controller for a welding machine, which is comprised of drive switching elements and the like connected in this manner.

Conventionally, there has been a circuit configuration of this type of output controller as shown in FIG. In FIG. 1, a first semiconductor rectifier unit 10 is a first semiconductor rectifier unit 10a, 10b, 10c.
The anode of each semiconductor rectifier is connected to three AC input terminals 100a, 100b, 100.
c, and the cathodes of the semiconductor rectifiers are connected in common to form one rectified output section. The second semiconductor rectifier Enit 12 is the second semiconductor rectifier 12a, 12b.
.

12c and one freewheeling diode 12d, and the cathode of each semiconductor rectifier is connected to the AC input terminal 1 separately.
00a, 100b, 100c K are connected, and the anodes of each of the above semiconductor rectifiers are connected in common.
It forms two rectified output sections. Further, the freewheeling diode 12d is connected between the output terminals 101a1101b. The conductor switching unit 14 is a semiconductor switching element 14a114b.

14c, the collectors of the semiconductor switching elements are commonly connected to the output section of the first semiconductor rectifier unit 10, and the emitters of the semiconductor switching elements are commonly connected to the output terminal 102a. The driving switching element 16 has its pace and collector connected to a control signal input terminal 104a.

104b, and its emitter is connected to each pace of the semiconductor switching elements 14a, 14b, and 14c.

Fig. 2 shows a specific structure of an output controller having the circuit configuration shown in Fig. 1. In the figure, parts I that are the same as those in Fig. Omitted. In FIG. 2, the first cooling fan 18 is connected to the first semiconductor rectifier 10.
a %' 10:Nb, 10 It serves both as installation and cooling, and is at the same potential as the cathode of the semiconductor rectifier in the lower part 1 fib. The second cooling fin 20 is the second semiconductor rectifier 12a, 12b.

12C and the freewheeling diode 12d, which also serve as a cooling device, have the same potential as the second semiconductor rectifier and the anode of the freewheeling diode. The third cooling fin 22 serves to cool the semiconductor switching elements 14a, 14b, and 14C, and has the same potential as the collector of the semiconductor switching elements. The fourth cooling fin 24 is used to attach and cool the driving switching element 16, and has the same potential as the collector of the driving switching element 16.

The first connection line 26 is connected to the semiconductor switching element 14a,
14 b, 14 c emitter and freewheeling diode 1
Connect with the cathode of 2d. The second connection line 28 connects the group 10 semiconductor rectifiers 10a, 10b.

10c cathode and the semiconductor switching element 14
a, 14 b, and 14 c are connected to the collectors.

The third connection line 36 is connected to the first semiconductor rectifier 10a, 1
0 b,' 10 ctf)''' Anodes and cathodes of the second semiconductor rectifiers 12a, 12'b, and 12c are connected, respectively.

Each of the cooling fins 18, 20, and 22 has several hollow insulating bushings 32 inserted into the holes 18a, 20a, and 22a drilled at its four corners, and a threaded rod 34 passed through the insulating bushings is inserted to maintain a constant spacing between the cooling fins. The first to third cooling fins 18, 20, 22 are attached to the threaded rod while fitting the spacer 36 to
．． Assemble and fix in sequence. The fourth cooling fin 24 is insulated and fixed on the third cooling 22 by an insulating fixture 40 .

FIG. 3 shows an enlarged cross-sectional view of the mounting portion of the insulating bushing 32.
hole 18a of each cooling fin 18.20.22,
The insulating bushing 32b is fitted into the narrow diameter portion 323' of the insulating bushing 32a passed through the insulating bushings 20a and 22a to sandwich the cooling fins, and the threaded rod 3 passed through the insulating bushing is
4 does not come into contact with the cooling fins.

As mentioned above, in the conventional output controller of a welding machine, each cooling fin is made for each unit and is independently insulated.

For this reason, a large number of insulating bushes, spacers, threaded rods, etc. are required to assemble each cooling fin, resulting in a complicated structure and a large cost for assembly. Furthermore, the workability of connecting to the AC input terminal is also poor. Furthermore, since this output controller needs to be insulated and incorporated into the welding machine main body, there are drawbacks such as increased installation cost and reduced reliability.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to simplify the structure and facilitate installation into the welding machine body, thereby reducing costs and improving reliability. The purpose of the present invention is to provide an output controller for a welding machine. □In order to achieve the above object, the present invention includes a semiconductor rectifier, one or more semiconductor switching elements connected in series to one end of the rectified output of this semiconductor rectifier, and one end connected to the output side of this semiconductor switching element. A welding machine output controller comprising a freewheeling diode P to which is connected, and a drive switching element connected to drive the semiconductor switching element, wherein the semiconductor rectifier, the semiconductor switching element, the freewheeling diode and the drive The switching elements are assembled on the same cooling fin with an insulator interposed therebetween.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings. FIG. 4 shows an external perspective view of the output control lid of the present invention, showing the semiconductor rectifier assembled on the cooling fin 42,
To protect the semiconductor switching elements from external dust, moisture or external mechanical damage, a cover 4 is usually made of synthetic resin.
3 is attached to the cooling fin. From this cutter, the AC input terminal 100 shown in FIG.
a, 100b, 100c, output terminals 102a, 102b
.

Control signal input terminals 104a and 104b are provided in a protruding manner.

FIG. 5 is a perspective view showing the internal circuit configuration with the cover 43 of FIG. 4 removed. In Fig. 5, the first rectifier pace "-44" is made of a conductor, and the force on its surface is ?/
A first semiconductor rectifier 10a having a common diode
, 10 b, and 10 c are attached.

The insulator 46 soldered between the first rectifier plate 4'4 and the cooling fin 420 is made of an extremely thin insulator with good thermal conductivity, such as alumina, in order to reduce thermal resistance. It is being The second rectifier pace 48 is made of a conductor, and the second semiconductor rectifiers 12a, 12b, 12c have an anode commonly soldered to the surface thereof.
Attach the freewheeling diode 12d to which Ano-P and Anno-P are soldered. The switching element paste 50 is made of a conductor, and the semiconductor switching elements 14a, 14b, 14'c having collectors commonly soldered to the surface thereof are attached. The driving switching element base 52 is made of a conductor, and the driving switching element 16 having a collector soldered to its surface is attached. ) The first to third connection conductors 26.28.3o are the same as those shown in FIG. 2, so the explanation of their connection relationship will be omitted. No. 2: The conductor connects the cup conductor plate 56 of the return conductor 12d. That is, the fourth connecting conductor 54
, the conductor plate 56, and the fifth connection conductor 57 connect the cathode of the freewheeling diode 12d and the semiconductor switching
The emitters of elements 14a, 14b, and 14c are connected. The sixth connection conductor 58 connects the drive switching element 16, the transmitter, and the semiconductor switching element 14.
a, 14b, 14. It connects each pace of C. The AC input terminals 100a, 100b, 100c are connected to the third connection conductor 3o, and one output terminal 102a is
The other output terminal 102b is connected to the conductor plate 56.
is connected to the second rectifier pace 48, one control signal input terminal 104a is connected to the driving element pace 52 which is at the same potential as the collector of the driving switching element 16, and the other control signal input terminal 102b is connected to the second rectifier pace 48. , is connected to the pace of the driving switching element 16.

And the second above. , rectifier pace 48, switching element pace 60. Drive switching element
,,52, between the conductor plate 56 and the cooling fins 420, there is also an insulating plate 6o, 62, 64, 66, which is the same as the insulating plate 46.
is soldered.

As mentioned above, each unit and drive switching element, etc. that were assembled in Figure 1 are assembled on one cooling fin through an insulator by means of soldering, etc., and the circuit configuration is the same as in Figure 1. Assemble the output controller of the welding machine by soldering the electrically conductive connecting conductors such as aluminum wired to the above units and drive switching elements, etc., and adhering them by ultrasonic bonding or laser bending. Because the structure is simple,
Good workability.

In such a structure, automatic wiring technology used in high-output power transistors and the like can be easily applied, and assembly and wiring can be easily automated. Furthermore, since the cooling fins of the assembled output controller are insulated, there is no need to insulate the assembly when incorporating it into the welding machine main body, resulting in good workability and improved reliability.

In the above embodiment, the explanation was made using plate-shaped cooling fins, but
The heat generation of each unit and each element is large (If the cooling capacity is not sufficient with plate cooling fins, attach a wavy cooling 7-inch 68 with a large surface area to the cooling fin 42 as shown in Figure 6 to increase the cooling capacity. Furthermore, instead of the cooling fins 42, switching elements for driving each unit may be assembled directly on the corrugated cooling fins 68.

As described above, according to the present invention, a semiconductor rectifier, a semiconductor switching element, a driving switching element, a freewheeling diode, etc. necessary for an output controller of a welding machine are soldered onto one cooling fin via an insulator. The structure is simple, automatic assembly is easy, and there is no need for insulation when incorporating it into the welding machine body, making it easy to assemble. Therefore, it is possible to achieve the effects of reducing overall costs and improving reliability. ,.

4. Brief explanation of the drawings...

FIG. 1 is a configuration diagram of a circuit 1 of an output controller, FIG. 2 is a structural diagram of a conventional output controller, and Section 1.1. FIG. 4 is an external perspective view of a single output restrictor according to an embodiment of the present invention, FIG. 5 is a perspective view showing its internal structure, and FIG. 6 is an enlarged sectional view of a part of the idle cycle. FIG. 7 is an external perspective view showing another embodiment of the moe.

In each figure, the same members are given the same symbols, 10 is a first semiconductor rectifier unit, 10a110b, 10c are first semiconductor rectifiers, 12 is a second semiconductor rectifier unit,
12a, 12b, 12c are second semiconductor rectifiers, 1
2d is a freewheeling diode, 14 is a semiconductor switching unit, 14a, 14b.

14c is a semiconductor switching element, 16 is a driving switching element, 18.20.22.24 is the first to fourth cooling fins, and 26.28.30.54.57.58 is the first
~The sixth connection wire (connection conductor) 32 is an insulated bushing, 34
is a threaded rod, 36 is a spacer, 40 is an insulating fixture, 42 is a cooling fin, 43 is a hook-144, 48 is a first and a second
rectifier pace, 46, 60, 62, 64, 66 is an insulator, 50 is a switching ice 1 base, 52 is a driving switch 1; Cink element Boehme 1, 56 is a conductor plate.

Agent Patent attorney Shin Kuzuno - (1 other person) Figure 1 □ Figure 2 Figure 3 Figure 4 Commissioner of the Japan Patent Office 1. Indication of the case: Japanese Patent Application No. 57-101720 2, Title of the invention: Welding machine protrusion controller 3, Person making the amendment 5, Claims of the specification to be amended, Detailed description of the invention.

Claims (1) A semiconductor rectifier, one or more semiconductor switching elements connected in series to one end of the rectified output of the semiconductor rectifier, and one end connected to the output side of the semiconductor switching element. In the output controller of a welding machine, which includes a freewheeling diode and a driving switching element connected to drive the semiconductor switching element, each of the above semiconductor rectifier, semiconductor switching element, freewheeling diode, and driving switching element is connected to C1. An output controller for a welding machine, characterized in that the cooling fins are placed on the same cooling fin or less through an insulator.

Claims (1)

[Claims] (11) a semiconductor rectifier, one or more semiconductor switching elements connected in series to one end of the rectified output of this semiconductor rectifier, a freewheeling diode with one end connected to the output side of this semiconductor switching element, and the above-mentioned semiconductor In an output controller for a welding machine, which includes a driving switching element connected to drive the switching element, each of the semiconductor rectifier, the semiconductor switching element, the freewheeling diode, and the driving switching element is connected to the same circuit through an insulator. An output force controller for a welding machine, characterized in that it is assembled on the cooling fins of the welding machine.