JP2006014405A - High-frequency starter structure in power unit for welder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-frequency starter structure in an arc welder at a low cost in easy-to-manufacture constitution, by reconciling the suppression of heat conduction between a coil and a control oscillating circuit and the electric insulation as well as constituting it compactly. <P>SOLUTION: This high-frequency starter structure possesses an air insulating layer which is made in wedge form from under a case, right between a high frequency coil being a heating part and a control oscillating circuit unit, by burying the high frequency coil and the control oscillating circuit unit individually in each pit of the case which has a first pit and a second pit, and charging them with mold resin. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a high-frequency starter structure in a power supply device for a welding machine or the like.

  In a power supply device for a welding machine that starts arc welding by superimposing high-frequency power on the welding current, the high-frequency power generation means is called a high-frequency starter structure, and can be housed in the power supply device for the welder in a compact manner and is electrically safe For example, a structure as shown in FIG.

There is the following description in paragraph (0014) of “JP-A-2002-285217”, “Spark gap device of high-voltage power supply device”. "The high-frequency high-voltage power supply is shown assembled on a circuit board such as a printed circuit board", "Insulators are molded on the top of the board to cover all electronic components to prevent electric shock" Therefore, a spark discharge device using this power source and related technology are disclosed. A conventional high-frequency starter structure of this type will be described with reference to FIG. A high frequency coil 2 and a control oscillation circuit unit 3 are embedded in a case 1 with a filler 4 and fixed to a printed wiring board 6 into which a connection terminal 5 is inserted and soldered. The case 1 is a resin molded product, and the high-frequency coil 2 is formed of, for example, a copper wire having a diameter of 3 mm with a turn number of 6 to 15 and a total length of 60 to 100 mm and a diameter of 20 to 30 mm. The connection terminal 5 is processed into a terminal shape that can be easily soldered. The control oscillation circuit unit 3 is formed by mounting electronic components such as transistors on a small wiring board. The filler 4 is an electrically insulating composite such as an epoxy resin or a silicone resin.

  The filler 4 which is an electrically insulating composite has a thermal conductivity of about 0.2 × kcal / mh ° C. in many cases. When energized for a long time, the heat of the high-frequency coil 2 is transmitted to the control oscillation circuit unit 3. Since the control oscillation circuit unit 3 wants to suppress a change in frequency due to a change in temperature, it is required to avoid an increase in temperature due to heat generated by the high frequency coil. On the other hand, this high-frequency generating structure is required to be formed as compact as possible, and it is desired to solve this problem without making the distance L between the high-frequency coil 2 and the control oscillation circuit unit 3 long.

  It is required to suppress heat conduction with a short distance L between the high-frequency coil and the control oscillation circuit. It is to suppress the heat conduction of the filler of this structure. And it is necessary to make it compatible with electrical insulation, and it is to constitute compactly. It is also an object of the present invention to enable the production cost to be reduced and to be provided at a low cost.

  It is required to suppress heat conduction with a short distance L. We focused on the difference in thermal conductivity between synthetic resin and air. For example, phenolic resin is 10 times the thermal conductivity of air. Epoxy resin has a thermal conductivity 20 times that of air (Mechanical Engineering Handbook; The Japan Society of Mechanical Engineers and Plastic Handbook; Asakura Shoten). We paid attention to the fact that it can be shortened.

  Since it is another issue to provide at a low manufacturing cost, both the filling of the coil and the control oscillation circuit unit with a mold resin in an independent case and the solution by avoiding an increase in manufacturing man-hours are achieved. The solution to these two propositions is to make the structure “a structure characterized by forming an air heat insulating layer at an intermediate portion of the case”.

Regarding claim 1,
A high frequency coil and a control oscillation circuit unit are individually embedded in each recess in a case having a first recess and a second recess, and each recess is filled with a mold resin, and the high frequency coil that is a heat generating portion is controlled. An air heat insulating layer was formed between the shortest distance from the oscillation circuit unit to obtain a high frequency starter structure.
Regarding claim 2,
A high frequency coil and a control oscillation circuit unit are individually embedded in each depression and filled with mold resin in one case having a first depression and a second depression, and the high frequency coil and the control oscillation circuit unit are filled with a printed wiring board. A high-frequency starter structure characterized in that an air heat insulating layer was formed in a wedge shape between the high-frequency coil and the control oscillation circuit unit, which was electrically connected and between the high-frequency coil serving as the heating portion of the control oscillation circuit unit and the control oscillation circuit unit.
Regarding claim 3,
A high frequency coil and a control oscillation circuit unit are individually embedded in each recess in a case having a first recess and a second recess, and the uppermost filling portion is filled with a mold resin in a connected shape, and a high frequency which is a heat generating portion An air heat insulating layer was formed in a wedge shape between the coil and the control oscillation circuit unit to provide a high-frequency starter structure.

  The high-frequency starter structure according to the present invention can reduce the size in the thickness direction of the insulating material for heat conduction, and can compact the outer shape. Filling the uppermost portion of the filling into a connected shape with the mold resin shortens the filling operation process, and has an effect that the performance is not inferior.

  FIG. 1 is a structural diagram showing an embodiment of the present invention. This will be described with reference to this figure. The case 1 is formed of an electrical insulator such as an epoxy resin or a phenol resin so that the first recess 8 and the second recess 9 sandwich the air heat insulating layer 7. For example, the control oscillation circuit unit 3 is embedded in the first recess 8, and the high-frequency coil 2 is embedded in the second recess 9 with a filler 4 such as silicone resin. The connecting terminal 5 of the electrical part to be filled is inserted into a hole opened in the printed wiring board 6 forming the control unit of the welding power supply device, and soldered and attached. The filler 4 is poured into the first depression 8 and the second depression 9 and fills the two depressions separated by the wedge-shaped air heat insulating layer, and further fills up to the uppermost part and is connected at the uppermost part. However, the work process is simplified and the efficiency is improved rather than stopping halfway, but the performance is the same in both cases.

  When there is a difference in horizontal plane between the upper surfaces of the fillers in the two depressions, it is necessary to manage the filling amount twice so as not to cause insufficient filling.

  At the final stage of the charging process in which the nozzle of the filling machine is disposed above one of the two depressions and charged, the filling material overflows into the other depression 9 and the filling proceeds. If process control is performed when the uppermost filling portion of the two depressions is connected at the end of filling of the depression 9 and the filling uppermost portion of the two depressions is connected, there is insufficient filling in either depression. It is effective because it does not occur.

  In this way, since the case 1 has a container structure in which two dents are connected, the number of man-hours for the case molding process as a whole is reduced compared to the case where two independent cases are used for each dent, and the inventory is reduced. Since the number of parts has also been reduced in management, the management man-hour can be reduced. Even when assembled to the printed wiring board 6 forming the control unit of the welding power source apparatus, it was possible to make it more compact than the case of using two case structures.

  When the high-frequency starter structure according to the present invention is incorporated in a welding power source device, it can be accommodated in a narrow power source device housing space, and the overall power source becomes a compact welding power source, which facilitates handling at the welding site. The reduction in man-hours contributed to the reduction of production costs and the provision of these products at a low cost, which has high industrial value and contributed to resource saving.

1 is a structural diagram showing an embodiment of the present invention. Sectional drawing which shows the conventional high frequency starter structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 High frequency coil 3 Control oscillation circuit unit 4 Filler 5 Connection terminal 6 Printed wiring board 7 Air heat insulation layer 8 1st hollow 9 2nd hollow

Claims (3)

A high frequency coil and a control oscillation circuit unit are individually embedded in each recess in a case having a first recess and a second recess, and each recess is filled with a mold resin, and the high frequency coil that is a heat generating portion is controlled. A high-frequency starter structure in a power supply device for a welding machine, wherein an air insulation layer is formed between the shortest distance to the oscillation circuit unit. The high frequency coil and the control oscillation circuit unit are individually embedded in each recess and filled with a mold resin in one case having the first depression and the second depression, and the printed wiring board is connected to the high frequency coil and the control oscillation circuit unit. A high frequency starter in a power supply device for a welding machine, wherein a heat insulating layer is formed in a wedge shape between the high frequency coil and the control oscillation circuit unit as a heat generating portion and the control oscillation circuit unit. Structure. A high frequency coil and a control oscillation circuit unit are individually embedded in each recess in a case having a first recess and a second recess, and the uppermost filling portion is filled with a mold resin in a connected shape, and a high frequency which is a heat generating portion A high-frequency starter structure in a power supply device for a welding machine, wherein an air insulation layer is formed in a wedge shape between a coil and a control oscillation circuit unit.

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