JP2005277269A - Welding transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a welding transformer capable of preventing a winding temperature from rising by a high frequency large current, reducing manufacturing manpower, ensuring the quality of a terminal, and further simplifying winding configurations with different capacities. <P>SOLUTION: In order to solve the problem, the welding transformer comprises a core 8 made by laminating a primary winding 5 and a secondary winding 6 which are conductors and by incorporating them therein. It is so configured that both sides or multilayer printed circuit board 9, 10 are used for the primary winding 5 and the secondary winding 6, respectively. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

    The present invention relates to a welding transformer.

    A configuration of a conventional welding transformer will be described with reference to FIG.

    A conventional high-frequency, high-current welding transformer in which an inverter circuit is arranged on the primary side includes a core 3 in which a primary winding 1 and a secondary winding 2 that are conductors are stacked and incorporated therein. A welding transformer is configured using copper plates for all of the wire 1 and the secondary winding 2 (see, for example, Patent Document 1).

In such a conventional welding transformer, when the speed of the inverter is increased, in order to prevent the “skin effect” in which the current concentrates only on the surface of the winding and the temperature rise of the winding is prevented, the copper plate of the winding is used. The welding transformer was constructed by dividing and laminating. In particular, in the case of high-frequency high current, in order to prevent the temperature rise due to the skin effect, the influence of the skin effect has been reduced by thinning the copper plate as much as possible and dividing it into several pieces to insulate each copper plate.
Japanese Unexamined Patent Publication No. 2000-223320 (FIGS. 4, 5, and 6)

  In conventional welding transformers, the higher the frequency and current, the greater the number of winding copper plates divided and laminated, and the number of insulating sheets 4 between the copper plates also increased.

  In addition, the number of caulking and screwing points for relaying the terminal portion has increased, and there has been a quality problem in the edge portion due to assembly variations.

  Furthermore, when constructing a welding transformer with a different scene, the thickness and thickness of the copper plate of the winding were changed.

  Therefore, the man-hours for assembling a welding transformer for high frequency and high current are greatly increased, the processing quality of the terminal portion is unstable, and there is a problem that it takes time to construct a winding with different capacities.

  The present invention solves the above-mentioned problem, prevents the winding temperature of the welding transformer from rising at a high frequency and a high current, reduces the number of manufacturing steps and ensures the quality of the terminal portion, and further simplifies the winding configuration with different capacities. An object is to provide a welding transformer.

  In order to solve the above-described problems, a welding transformer according to the present invention includes a primary winding and a secondary winding, which are conductors, and a core that incorporates them, and includes a primary winding and a secondary winding. A printed board provided with a conductor pattern on both sides or multiple layers is used.

  With the above configuration, the welding transformer of the present invention can secure insulation between layers by double-sided or multi-layer printed circuit boards, so that the number of insulating sheets can be reduced. The number of crimping and screwing points has increased, and there has been a problem with the quality of the terminal due to assembly variations. However, the use of a printed circuit board for the winding reduces the number of relays in the terminal, and the quality of the terminal. Provides a welding transformer that can prevent the winding temperature of the welding transformer from rising with high frequency and high current, reduce the number of manufacturing steps, ensure the quality of the terminal, and simplify the winding structure with different capacities. It has the action.

  As is apparent from the above description, the welding transformer of the present invention prevents a rise in the winding temperature of the welding transformer at a high frequency and a large current, and can reduce the number of manufacturing steps and ensure the quality of the terminal portion. This has the effect of providing a welding transformer that simplifies the winding configuration.

(Embodiment)
Embodiments of the present invention will be described below.

  In FIG. 1, 5 is a primary winding, 6 is a secondary winding, 7 is an insulating sheet, 8 is a core, 9 is a multilayer printed circuit board on which a copper foil pattern is printed as a primary winding 5, and 10 is a secondary A multilayer printed board on which a copper foil pattern is printed as the winding 6.

  Next, the configuration of the primary winding 5 when the primary winding 5 is 4 turns and the secondary winding 6 is 1 turn will be described.

  As shown in FIG. 2, a core through-hole 13 is provided in the center of the printed circuit board 9, and each layer is formed in the substrate with respect to a winding composed of four layers of copper foil so as to surround the core through-hole 13. From the uppermost layer to the lowermost layer, the core through holes 13 are electrically turned four times to connect the terminal portions 11 provided in the uppermost layer and the lowermost layer.

  Next, the configuration of the secondary winding 6 will be described.

  As shown in FIG. 3, a core through hole 13 is provided in the center of the printed circuit board 10, and a winding composed of four layers of copper foil so as to surround the core through hole 13 has the same shape in each layer. A terminal portion 12 provided at the end of the winding is connected to all the four layers of copper foil in the substrate, and the terminal portion 12 provided at the end of the winding is electrically connected to the core through hole 13 by making one round. It is configured to connect.

  Using these printed boards 9, 10, the core 8 is placed and the insulating sheet 7 is placed as shown in FIG.

  Next, the printed circuit board 9 of the primary winding 5 is disposed on the insulating sheet 7.

  Next, an insulating sheet 7 is disposed on the printed circuit board 9 of the primary winding 5.

  Next, the printed board 10 of the secondary winding 6 is disposed on the insulating sheet 7.

  Next, an insulating sheet 7 is disposed on the printed circuit board 10 of the secondary winding 6.

  Next, the printed circuit board 10 of the secondary winding 6 is arranged on the insulating sheet 7 so as to be vertically aligned with the printed circuit board 10 of the secondary winding 6.

  Next, an insulating sheet 7 is disposed on the printed circuit board 10 of the secondary winding 6.

  At this time, as shown in FIG. 4, the printed circuit board 9 of the primary winding 5 and the printed circuit board 10 of the secondary winding 6 are arranged so that the terminal portions thereof are in opposite directions.

  Finally, the core 8 is placed to complete.

  In this configuration, for example, the primary winding 5 and the secondary winding 6 may be reversed.

  In the present embodiment, the primary winding 5, the secondary winding 6, and the secondary winding 6 are arranged in this order, but this is the secondary winding 6, the primary winding 5, and the secondary winding. The order of line 6 may be used.

  Further, only the primary winding 5 may be a printed circuit board, and the secondary winding 6 may be formed of a copper plate to cope with a large current.

  Conversely, only the secondary winding 6 may be a printed circuit board and the primary winding 5 may be a copper plate.

  When the capacity of the welding transformer changes greatly, as shown in FIGS. 3 and 4, the printed board 9 of the primary winding 5 and the printed board 10 of the secondary winding 6 are set as one set, and N sets (N = positive) It is possible to simplify the winding configuration with different capacities.

  With the above-described configuration, for example, an effect when the inverter of the welding machine is speeded up for the purpose of downsizing, labor saving, high speed control, etc. will be described.

  The speed-up of the inverter circuit inside the welder causes a “skin effect” in which current concentrates only on the winding surface of the welding transformer.

  Conventionally, in order to prevent this, the copper plate of the winding is divided and laminated to form a welding transformer. Especially in the case of high frequency and high current, the copper plate is made as thin as possible and divided into several pieces to prevent temperature rise due to the skin effect. Insulation between the copper plates reduces the effect of the skin effect, but in this case, the high frequency high current increases the number of winding copper plates divided and laminated, thereby insulating the copper plates. The number of seats has also increased.

  On the other hand, in this embodiment, since insulation between layers can be ensured by a double-sided or multilayer printed board, the number of insulating sheets can be reduced.

  In addition, in the winding configuration using only a copper plate, the number of caulking and screwing points for relaying the terminal part has increased, and there has been a problem in the quality of the terminal part due to assembly variations. By using a printed circuit board for the winding, The number of relay points in the terminal portion is reduced, and the quality of the terminal portion is stabilized.

  Furthermore, when the current flowing through the primary winding and the secondary winding is the same current density, if a copper plate is used only on the side where the required winding cross-sectional area is large, a large current welding transformer that cannot be handled only by the printed circuit board will be used. It can be configured.

  In addition, as shown in FIG. 5, the primary winding and the secondary winding are set as one set, and N, set (N = positive integer), and in the figure, two sets are combined to form windings with different capacities. The line configuration can be simplified.

  With such a configuration, the welding transformer of the present invention can reduce the number of manufacturing steps and ensure the quality of the terminal portion, and can further simplify the winding configuration with different capacities.

  According to the welding transformer of the present invention, it is possible to prevent an increase in the winding temperature of the welding transformer at a high frequency and a large current, to reduce the number of manufacturing steps and to ensure the quality of the terminal portion, and to further simplify the winding configuration with different capacities Therefore, it is useful as a part of a welding machine using an inverter.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the welding transformer in embodiment of this invention, (a) is a front view, (b) is a side view, (c) is a rear view. BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the printed circuit board of the primary winding in embodiment of this invention, (a) is a front view, (b) is a top view, (c) is a rear view. BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the printed circuit board of the secondary winding in embodiment of this invention, (a) is a front view, (b) is a top view, (c) is a rear view. BRIEF DESCRIPTION OF THE DRAWINGS It is an internal block diagram of the welding transformer in embodiment of this invention, (a) is sectional drawing of a primary winding part, (b) is sectional drawing of a secondary winding part It is an external view of the welding transformer in other embodiment of this invention, (a) is a front view, (b) is a side view, (c) is a rear view. External view of conventional welding transformer

Explanation of symbols

5 Primary winding 6 Secondary winding 7 Insulation sheet 8 Core 9 Printed circuit board 10 Printed circuit board 11 Terminal part 12 Terminal part 13 Core penetration hole

Claims (3)

Welding using a printed circuit board in which a primary winding and a secondary winding, which are conductors, are stacked, a core including them is provided, and conductor patterns are provided on both sides or in multiple layers as the primary and secondary windings Trance. The welding transformer according to claim 1, wherein when the currents flowing through the primary winding and the secondary winding are the same current density, a copper plate is used only on the side having a large required winding cross-sectional area. The welding transformer according to claim 1 or 2, wherein the primary winding and the secondary winding constitute one set, and N sets (N = positive integer) are combined.