JP2695224B2 - High frequency transformer for welding - Google Patents

Description

The present invention relates to a winding structure of a welding high frequency transformer.

[Conventional technology]

The schematic configuration of an arc welding power source using a high frequency transformer
Figure 10 shows. Reference numeral 1 is a primary side rectifier circuit for converting an AC input to DC, 2 is an inverter for exchanging the DC output of the rectifier circuit 1 for high frequency AC, 3 is a high frequency transformer for stepping down the AC output of the inverter 2, 4 is a secondary side rectifier circuit 5 is a DC reactor,
Reference numeral 6 is an arc load, and 7 is an inverter drive circuit for performing feedback control of output voltage and current.

FIG. 11 is a diagram showing an example of connection between the high frequency transformer 3 and the secondary side rectification circuit 4, where (a) shows a center tap system and (b) shows a system without a center tap.

FIG. 5 is a diagram showing a connection example of a high-frequency transformer, and FIGS. 6 and 7 show an example of a winding structure of a conventionally used high-frequency transformer for welding, which has the same rectangular insulated conductor. the primary coil P ₁ which is bisected, as shown in FIG. 6 by winding Etsujiwaizu in diameter, P ₂ and the secondary coil _{S 11, S 12, S 13} , S 14 and S _21,
Forming a _{S 22, S 23, S 24} , this primary, secondary two coils, so organized input coils together are arranged on the same level as shown in FIG. 7 (a) or (b), the primary coil P ₁ and P ₂ are connected in series and the secondary coils S ₁₁ , S ₁₂ , S ₁₃ , S ₁₄ and S ₂₁ , S ₂₂ , S ₂₃ , S ₂₄ are connected in parallel, respectively, to form a connection with a center tap.

Another example shown in FIG. 8 and FIG. 9 is to form the primary coils P ₁ and P ₂ and the secondary coils S ₁₁ and S ₁₂ and S ₂₁ and S ₂₂ which are divided into two by flat-wise winding a rectangular insulated conductor. The primary coils P ₁ and P ₂ arranged on the innermost and outermost sides are connected in series, and the secondary coils S ₁₁ and S ₁₂ and S ₂₁ and S ₂₂ which are alternately arranged on the inner and outer sides are connected in parallel. A high-frequency transformer 3 for welding is constructed by connecting wires with a center tap, and incorporating these primary and secondary coils in the center leg of an iron core 8 consisting of two E-shaped ferrite cores. Although illustration is omitted, similar ferrite cores are used in the examples of FIGS. 6 and 7.

As a publicly known example of this type of high frequency transformer for welding, there is Japanese Patent Application No. Sho 59-122111.

[Problems to be solved by the invention]

The conventional example shown in FIGS. 6 and 7 is the welding power source input voltage 20.
When applied to a 0V class standard type welding transformer, the coil dimensions and core dimensions can be made smaller than the other examples shown in Fig. 8 and Fig. 9, and the welding transformer can be made smaller and lighter. However, the welding voltage transformer of 400V input voltage has twice the number of turns of the primary coil as that of the input voltage of 200V class. Therefore, the thickness of the conductor insulation of the primary coil in which the rectangular insulated conductor is edgewise wound. It is doubled, and the coil winding width is increased accordingly. In other words, the current in the primary coil is halved, so to make the copper loss the same, the conductor cross-sectional area may be 1/2 of that of the 200V class input voltage, and the conductor thickness of the primary coil may be 1/2. Since the number of turns is doubled, the thickness of the conductor insulator of the entire primary coil is doubled, so that the coil winding width dimension is increased and the coil cannot be inserted unless the core dimension is increased.

As a result, the cost is higher than the standard product with an input voltage of 200 V class, and the external dimensions are also larger.

The object of the present invention is to increase the types of rectangular conductors and cores,
It is to provide a high-frequency welding transformer that is small, lightweight, and inexpensive.

[Means for solving the problem]

The above-mentioned object is a primary coil in which the rectangular insulated conductor is two-tiered inside and outside and is edgewise wound, and the rectangular insulated conductor is two-tiered inside and outside and the radial dimension and winding pitch are the same as those of the primary coil. It is composed of 2n (n is a positive integer) secondary coils wound in an edgewise manner so as to be substantially the same, and each coil of the secondary coil is intertwined with each coil of the primary coil so as to have a length When the secondary coil on the winding start side of the coils arranged in the same row is numbered as the first coil, the winding inside the 2i + 1th coil (i is a positive integer of 0) Winding start and the winding start of the 2i + 2nd outer winding are connected as the first external output terminal, and the winding end of the outer winding of the 2i + 1st (i is 0 and a positive integer) coil and 2i + 2nd Connect the winding ends of the inner winding of The second external output terminal,
End of winding inside 2i + 1st coil and 2i + 2
This is achieved by connecting the end of the second outer winding and the start of the outer winding of the 2i + 1th coil with the start of the 2i + second inner winding to form an intermediate terminal.

[Action]

The present invention assumes that the primary coil and the secondary coil are both double-tiered and edgewise wound so that the same core as that of the 200V class can be used even if the input voltage is 400V class. The inner coil and the outer coil are connected in series, and in the input voltage 200V class, the inner coil and the outer coil are connected in parallel so that the coil winding width is made equal.

Even if the total number of turns of the primary coil is doubled by adopting the two-stage overlap edgewise winding, the number of turns of each of the inner coil and the outer coil is 1/2 of the total number of turns. The size of the core can be made smaller than that of the conventional example shown in FIG. 6 and FIG.

〔Example〕

An embodiment of the present invention is shown in FIGS. This example embodies a welding high-frequency transformer with an input voltage of 400 V class in which the total number of turns of the primary coil is 32 T and the number of turns of the secondary coil is 4 T, and its wiring diagram is shown in FIG.

2 divided primary coil P _1, P _2, 8 divided secondary coil
S _11, using the S _12, S _13, S ₁₄ and _{S 21, S 22, S 23} , both flat Each insulated conductor in S _24, the primary coil inside the P _1, two and a P ₂ on the outside Edgewise winding and stacking in a step, the secondary coil is S ₁₁ ,
S ₂₂ , S ₁₃ , S ₂₄ inside and S ₂₁ , S ₁₂ , S ₂₃ , S ₁₄ inside, and edgewise wound in two layers, P ₁ -P ₂ , S ₁ -S ₂ ,
A primary coil and a secondary coil, which are alternately arranged in the same row as P ₁ -P ₂ and S ₁ -S ₂ , are arranged in the same row, and are attached to the center leg of the iron core 8 consisting of two E-shaped ferrite cores on the bobbin. It is assembled via 9 to form a high frequency transformer for welding. The secondary coil has four coils each of S ₁₁ , S ₁₂ , S ₁₃ , S ₁₄ and S ₂₁ , S ₂₂ , S ₂₃ and S ₂₄ connected in parallel, that is, the secondary coil on the winding start side is i When numbering as the th coil, 2i + 1th (i
Is 0 and a positive integer) the beginning of the winding inside the coil and 2i
The winding start of the + 2nd outer winding is connected to form the first external output terminal, the winding end of the outer winding of the 2i + 1th coil (i is 0 and a positive integer) and the 2i + 2nd inner winding Connect the end of wire winding to the second external output terminal, 2i +
Connect the end of the inner winding of the 1st coil and the end of the 2i + 2nd outer winding and the start of the outer winding of the 2i + 1st coil and the start of the 2i + 2nd inner winding As the intermediate terminal, and the primary coil is the inner coil
P ₁ and the outer coil P ₂ are connected in series, and the total number of turns of the primary coil is P ₁ + P ₂ .

In the welding high-frequency transformer of the present embodiment thus configured, the number of turns of the inner coil P ₁ and the outer coil P ₂ of the primary coil is 1/2 of the total number of turns, and the thickness of the conductor insulator in the winding width direction is large. or else not 32T content of P ₁ + P ₂ as in the conventional example shown in FIG. 5-FIG. 7, since the half of 16T content, it can be reduced winding width,
The core of the same size as the one of the input voltage 200V class can be used. Further, in this embodiment, the ratio of the number of turns of the primary and the secondary is 8: 1.
Therefore, the primary current is 1/3 of the secondary current, and the current flowing through each secondary coil is 4 secondary coils connected in parallel and the circuit is a center tap type secondary current. Since it is about 1/6 of the whole, the conductors used for the primary coil and the secondary coil may have the same size. Moreover, since the primary and secondary coils are arranged in a mixed manner, and the secondary coil has the inner coil and the outer coil alternately connected in parallel,
Similar to the conventional example shown in FIGS. 8 and 9, the degree of coupling between the primary and secondary coils is good, and the leakage reactance can be reduced.

The same coil arrangement as that of this embodiment, in which the primary coils P ₁ and P ₂ are connected in parallel, can be used as a high frequency transformer for welding with an input voltage of 200 V class.

This embodiment is an example in which the turns ratio of the primary and secondary is 8: 1, but other turns ratios can be similarly constructed, and if there are extra turns of the primary coil, the extra turns are It may be arranged at both ends or the central portion in the direction.

〔The invention's effect〕

 The present invention has the following effects.

(1) Since the primary and secondary coils are double-tiered and edgewise wound, the coil conductor and conductor insulators need only be half the total number of turns in the winding width direction, and the core size can be made smaller than before. The size and weight of the entire transformer can be reduced.

(2) The two-tiered edgewise winding primary and secondary coils are arranged in the same row with the coils interlaid, and the inner secondary coil and the outer secondary coil are placed between the intermediate terminal and the two output terminals. Since they are connected in the same number, both primary and secondary coil coupling is good, and the output characteristics of the welding high frequency transformer can be improved.

(3) Since the inner coil and the outer coil can be wound in two layers at the same time, the number of winding steps can be reduced to half.

(4) Even in a transformer with an input voltage of 400V class, the coil winding width can be made the same as that of an input voltage of 200V class, and the core can be shared, which is also effective in standardizing parts and reducing management costs.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a winding structure according to an embodiment of the present invention, FIG. 2 is a perspective view thereof, FIG. 3 is a winding configuration diagram thereof, and FIG. 4 is a winding structure of this embodiment. Sectional view of the welding high-frequency transformer, FIG. 5 is a diagram showing a wiring example of the welding high-frequency transformer, FIG. 6 is a conventional winding configuration diagram, and FIGS. 7 (a) and 7 (b).
Is a partial sectional view showing an example of a conventional winding structure, FIG. 8 is a connection diagram showing another example of a conventional welding high-frequency transformer, FIG. 9 is a sectional view showing the winding structure, and FIG. Is a block diagram of an arc welding power source using a high frequency transformer, Fig. 11 (a),
(B) is a figure which shows the example of connection of the welding high frequency transformer and the secondary side rectification circuit. 3 ... High frequency transformer for welding, P ₁ , P ₂ …… Primary coil,
_{S 11, S 12, S 13} , S 14 and _{S 21, S 22, S 23} , S 24 ...... secondary coil.

Claims (1)

(57) [Claims] 1. A primary coil in which flat rectangular insulated conductors are stacked inside and outside in two stages and edgewise wound, and a flat insulated conductor is stacked in two stages inside and outside to form a radial dimension and a winding pitch. And 2n (n is a positive integer) secondary coils that are edgewise wound so as to be substantially the same as the above. Each coil of the secondary coil is made to interlock with each coil of the primary coil and is long. When the secondary coil on the winding start side of the coils arranged in the same row in the vertical direction is numbered as the first coil, the inner winding of the 2i + 1th coil (i is 0 and a positive integer) Connect the winding start of the wire and the winding start of the 2i + 2nd outer winding to the first external output terminal, and the winding end of the outer winding of the 2i + 1st (i is 0 and a positive integer) coil and 2i + 2 Connect the winding ends of the second inner winding The second external output terminal,
End of winding inside 2i + 1st coil and 2i + 2
High frequency transformer for welding, characterized in that the winding end of the second outer winding, the winding start of the outer winding of the 2i + 1th coil and the winding start of the second inner winding of the 2i + 1th coil are connected to form an intermediate terminal. vessel.