WO2012131754A1

WO2012131754A1 - Snubber device

Info

Publication number: WO2012131754A1
Application number: PCT/JP2011/001807
Authority: WO
Inventors: 善則神田
Original assignee: 三菱電機株式会社
Priority date: 2011-03-28
Filing date: 2011-03-28
Publication date: 2012-10-04
Also published as: TW201240297A; JPWO2012131754A1; CN103460317A; CN103460317B; TWI423570B; JP5652543B2

Abstract

In order to eliminate the need for attachment to a connecting part by attaching a crimping terminal to the lead of a capacitor or by soldering, and to connect the lead of a capacitor easily, provided is a snubber device equipped with: a capacitor that has lead wires, and that absorbs the surge voltage generated by a switching element by means of the lead wires; a resin case in which the capacitor is inserted and anchored; and connecting conductors that are formed with conductors, one piece of which is affixed to the resin case and the other piece of which is connected to a different terminal of the switching element. The lead wires are affixed to the connecting conductors by deforming a molded part, which is formed by processing one of the pieces of the connecting conductor, and by inserting the lead wires between the molded part and a plate-like part of the piece of the connecting conductor which excludes the molded part.

Description

Snubber equipment

The present invention relates to a snubber device that protects a DC-side capacitor and a power converter from an overvoltage caused by a generated surge by absorbing a surge voltage generated by a switching element that is a semiconductor element used in the power conversion device.

A switching element, which is a semiconductor element, is used to convert direct current to alternating current with a power converter, such as a servo amplifier or inverter, or to change the output voltage with a switching converter. Switching). In this switching, the current is turned on and off, so a large surge voltage is generated in the transitional state of the switching, the DC bus voltage rises instantaneously and exceeds the breakdown voltage limit of the switching element itself and the DC side capacitor, There is a possibility of destroying the converter and capacitor. Therefore, in order to absorb the surge voltage in the vicinity of the switching element, a snubber device in which a capacitor alone or a combination of a capacitor and a resistor is arranged to absorb the generated surge voltage.

A capacitor is used as a snubber element for absorbing the surge voltage generated by the switching element. To absorb the surge voltage generated by the switching element, the reactance between the terminal of the switching element and the snubber element is minimized. Therefore, it is necessary to attach the snubber device in the immediate vicinity of the switching element. Previously, the insulation tube was attached to secure the insulation between the snubber element capacitor and the circuit around it, and the crimp terminal to attach to the switching element. A snubber element was fixed with a bond to prevent vibrations. However, since it requires a lot of manual work and man-hours, in recent years, what has been molded in a resin case has become the mainstream, and the components that make up the snubber circuit are affixed to a conductor plate and molded with resin together with the lead terminals attached to the semiconductor elements. Thus, a snubber device is configured (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2000-102241 (page 4, column 0020 and FIG. 2)

However, the resin mold product has a problem that its weight is very large and the cost is very high. Furthermore, since the cross section of the capacitor used as a component constituting the snubber circuit is a unique shape such as an ellipse or a circle, it is difficult to fix or the conductor part is a thin lead wire, making connection difficult. Conventionally, they are connected by soldering or welding, and there is a problem that workability is poor.

The present invention has been made to solve the above-described problems, and by using the stress generated along with the deformation of the molded portion formed in the connection conductor, the crimp terminal is attached to the capacitor lead. The object is to eliminate the need for soldering or the like to be attached to the connection portion and to easily fix the capacitor leads.

A snubber device according to the present invention includes a lead wire, a capacitor that absorbs a surge voltage generated by a switching element via the lead wire, a resin case that fits and fixes the capacitor, and a conductor, and one piece is a resin case. Connecting conductors that are fixed to each other and whose other pieces are respectively connected to different terminals of the switching element, and the lead wire is a connecting conductor that excludes the molding part by deformation of the molding part formed by processing one piece of the connection conductor Between the plate-shaped part of one piece and the molding part and fixed to the connection conductor.

According to the snubber device according to the present invention, by using the stress generated with the deformation of the molded portion formed in the connection conductor, the crimping terminal is attached to the capacitor lead or attached to the connection portion by soldering or the like. There is an effect that the capacitor lead can be easily connected without using it.

It is an exploded view of the snubber apparatus by Embodiment 1 of this invention. It is a connection completion figure in the snubber apparatus by Embodiment 1 of this invention. It is a top view before and behind inserting a capacitor | condenser in the resin case by Embodiment 1 of this invention. It is sectional drawing before and behind a deformation | transformation of the resin molding lid by Embodiment 1 of this invention. It is sectional drawing which showed before and after the resin molding lid | cover is attached to the resin case in which the capacitor | condenser by Embodiment 1 of this invention was inserted. It is an expanded view which shows the structure of the connection conductor by Embodiment 1 of this invention. FIG. 3 is an oblique projection view of a connection conductor provided with one Z-shaped molded part for connecting a capacitor lead wire according to Embodiment 1 of the present invention; It is sectional drawing before and behind connecting the lead wire of a capacitor | condenser to the connection conductor by Embodiment 1 of this invention. FIG. 5 is an oblique projection view of a connection conductor having two Z-shaped molded portions that connect the lead wires of the capacitor according to Embodiment 1 of the present invention. FIG. 6 is an oblique projection view of another connection conductor provided with one Z-shaped molded portion for connecting a capacitor lead wire according to Embodiment 1 of the present invention; It is a perspective view which shows the state which attaches the snubber apparatus by Embodiment 1 of this invention to a switching element. It is an exploded view of the snubber apparatus by Embodiment 2 of this invention. It is a connection completion figure in the snubber apparatus by Embodiment 2 of this invention. It is sectional drawing which shows the staircase-shaped or taper-shaped process provided in the resin case by Embodiment 2 of this invention. It is a side view which shows the relationship between the screw hole of the resin case by Embodiment 2 of this invention, and the screw hole of a connection conductor. It is an expanded view which shows the structure of the connection conductor by Embodiment 2 of this invention. It is sectional drawing before and behind inserting the capacitor | condenser from which size differs by Embodiment 2 of this invention in a resin case. It is a connection completion figure in the snubber apparatus before and behind inserting the capacitor in which size differs by Embodiment 2 of this invention in a resin case. It is an oblique projection which shows the connection state of the snubber apparatus from which size differs by Embodiment 2 of this invention.

Embodiment 1 FIG.
Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

FIG. 1 is an exploded view showing a snubber device according to Embodiment 1 of the present invention, and FIG. 2 is a completed connection diagram of the snubber device. The snubber device efficiently absorbs a surge voltage generated during operation of the switching element to prevent overvoltage breakdown of the switching element. 1 and 2, the snubber device includes a resin molded lid 1, a capacitor 2 a, a resin case 3, and a connection conductor 4. Two lead wires 9 for connecting to the switching element extend from the capacitor 2 a, and the capacitor 2 a absorbs a surge voltage generated by the switching element through the lead wire 9. The resin case 3 is for fixing and fixing the capacitor 2a. The resin-molded lid 1 covers and fixes the capacitor 2a fitted in the resin case 3 from above, and the end of the capacitor 2a in the longitudinal direction is processed as described later, and is attached to the resin case 3. It is done. Further, the connection conductor 4 is fixed by sandwiching and fixing the two lead wires 9 of the capacitor 2a in cooperation with the resin case 3, and is attached to the switching element with one touch.

In addition, although the resin case 3 showed the example which has a wall only in 2 directions in FIG. 1, 3 directions may be a wall and 4 directions may be a wall like a box shape. In the case of a box-shaped resin case whose walls are in four directions, holes or gaps are provided for leading out the capacitor leads.

FIG. 3A is a plan view before the capacitor 2 a is inserted into the resin case 3, and FIG. 3B is a plan view after the capacitor 2 a is inserted into the resin case 3.
As shown in FIG. 1 and FIG. 3, each of the walls of the resin case 3 covering the capacitor 2 a, that is, the opposing inner walls of the resin case 3, for example, has a substantially U-shaped cross section. It has. Then, as shown in FIG. 3 (b), the capacitor 2a is fixed to the fixed end of the U-shaped resin molded portion 5 (the U-shaped resin molded portion 5 and the resin case 3 against the stationary state of the U-shaped resin molded portion 5). The capacitor 2a can be attached with one touch by inserting it so that it slides in the direction from the free end (free end that is not fixed anywhere) to the free end. The capacitor 2a is sandwiched and fixed by the stress of the resin at the time of deformation.

In addition, it is not always necessary to provide a pair of the U-shaped resin molded portions 5 on both walls of the resin case 3, and only one may be provided on one wall. Further, for example, when the wall of the resin case 3 surrounding the capacitor 2a is in four directions, it is conceivable that the capacitor 2a is inserted from above, and the U-shaped resin molded portion 5 shown in FIG. A structure in which the capacitor 2a is slid from the fixed end to the free end of the U-shaped resin molding portion 5 may be employed. Further, a plurality of the U-shaped resin molded portions 5 may be provided. Moreover, it is not always necessary to mold the cross section into a substantially square shape, and one end may be fixed to the wall inside the resin case 3 and may be another shape as long as it is an elastic member that generates stress. It may not be resin.

The lid connection holes 7 and 8 for attaching the resin-molded lid 1 are vacant at several locations, and the resin-molded lid 1 can be fitted and attached to the lid connection holes 7 and 8 even when capacitors having different thicknesses are attached. Is provided. Here, the lid connection holes 7 and 8 are holes having different shapes. For example, after the convex portion formed at one end in the longitudinal direction of the resin molded lid 1 is fitted into the lid connection hole 8, the length of the resin molded lid 1 is increased. A plurality of lid connection holes 7 are attached to the resin case 3 at appropriate positions among the plurality of lid connection holes 7 while pressing the inverted triangular projections formed at the other end in the direction downward. But the convex part formed in the longitudinal direction both ends of the resin molding lid | cover 1 and the lid | cover connection holes 7 and 8 may be the same shape.

4A and 5A are sectional views of the resin molded lid 1 in a steady state, and FIGS. 4B and 5B are views of the resin molded lid 1 of the resin molded lid 1. It is sectional drawing which shows the resin stress when changing an S-shaped molded part.
As shown in FIG. 4A, the resin-molded lid 1 has a substantially S-shaped cross section, and the lower part has a shape that matches the shape of the upper part of the capacitor 2a. Then, as shown in FIG. 4B, stress can be obtained by contracting the S-shaped portion from above by applying force to the lower side where the capacitor 2a is stored. By using this, as shown in FIG. 5 (b), the capacitor 2a and the resin molding can be performed by the resin stress of the S-shaped molding portion 6 simply by attaching the resin molding lid 1 after the capacitor 2a is attached to the resin case 3. The capacitor 2a can be pressed and fixed without generating a gap with the lid 1. In addition, since the S-shaped molded part 6 has resin stress, it is not necessary to design the intervals between the plurality of lid connection holes 7 and 8 for accommodating capacitors of various sizes.

FIG. 6 is a development view showing the structure of the connection conductor 4 shown in the first embodiment. FIG. 11 is an oblique projection showing a state in which the snubber device shown in the first embodiment is attached to the switching element.
6 and 11, a connection conductor 4 is a conductor to which the lead wire 9 of the capacitor 2a is attached and connected to the terminal of the switching element 14a. For example, a metal such as copper is used. The terminal of the switching element 14a has a first terminal, a second terminal, and a third terminal in the case of a 2-in-1 type switching element in which two IGBTs shown in FIG. 11 are set, and the snubber device includes, for example, the first terminal and the first terminal. Connected to two terminals. In the 2-in-1 type switching element, the first terminal is connected to the collector of one IGBT, and the second terminal is connected to the emitter of the other IGBT. The third terminal is connected to the emitter of one IGBT and the collector of the other IGBT. The snubber device is connected to the first terminal and the second terminal of the switching element 14 a together with the connection conductor 4. Here, the switching element 14a is an element that turns on / off a part of an electric circuit in order to convert power in a power conversion device that obtains desired output power from input power, for example, IGBT, MOS FET, GTO, A thyristor or the like is used.

Further, since the reactance between the switching element 14a and the snubber device increases as the distance from the switching element 14a increases and the surge voltage absorbed by the capacitor 2a decreases, the snubber device is provided in the vicinity of the switching element 14a.

In FIG. 6, the connection conductor 4 is a conductor having a substantially L-shaped cross section, and has a cross-sectional Z-shaped molded portion 13 in one L-shaped piece, and the free end of the other L-shaped piece (connecting portion with the switching element). Is bent into a U-shaped cross section.
The cross-section Z-shaped molding portion 13 provided in the L-shaped piece is formed by bending the sheet metal portion between the pair of slits 12 provided in the L-shaped piece into the Z-shaped cross section, and forming the Z-shaped lead. When the wire 9 is inserted into the insertion guide part 16 of the cross-sectional Z-shaped molding part 13, a stress is generated in a direction opposite to the direction in which the cross-sectional Z-shaped molding part 13 is compressed. Then, the stress due to the deformation of the cross-sectional Z-shaped molding portion 13 is molded so as to act on the L-shaped piece of the cross-sectional Z-shaped molding portion 13. Similarly, an unprocessed plate-like portion (not shown) excluding the processed cross-sectional Z-shaped molding portion 13 of the L-shaped piece, that is, the plate-like portions at both ends of the pair of slits 12, Stress is generated in the direction in which the lead wire 9 is present during insertion. Further, the cross-sectional Z-shaped molding part 13 has an insertion guide part 16 for guiding the insertion of the lead wire 9 and a drawer guide part 19 for guiding the lead wire 9 to be drawn. It can be done easily.

FIG. 7 is an oblique projection view of the connection conductor 4 having one cross-section Z-shaped molded portion 13 for connecting the lead wire 9 of the capacitor 2a. FIGS. 8 (a) and 8 (b) show the connection conductor 4 and the capacitor 2a. It is sectional drawing before and behind connecting the lead wire 9. FIG.
As a method for fixing the lead wire 9 of the capacitor 2a, first, as shown in FIG. 7 and FIG. 8A, the lead wire 9 of the capacitor 2a is in the direction indicated by the arrow (from the cross-sectional Z-shaped molded portion). 13 and the plate-like portion of the connection conductor 4), that is, along the insertion guide portion 16. At this time, the lead wire 9 is pushed from the end of the cross-sectional Z-shaped molded part 13 to the intermediate part along the cross-sectional Z-shaped molded part 13 against the elastic force generated by the deformation of the cross-sectional Z-shaped molded part 13.

8B, the lead wire 9 of the capacitor 2a is connected so as to be sandwiched between the intermediate portion of the cross-sectional Z-shaped molded portion 13 and the plate-like portion of the connecting conductor 4, and the capacitor shown in FIG. It is sandwiched and fixed by the stress caused by the deformation from the cross-section Z-shaped molded portion 13 indicated by the arrow toward the plate-like portion of the connection conductor 4 and the stress of the unprocessed plate-like portion. Also, the lead wire 9 of the capacitor can be easily inserted by the cross-sectional Z-shaped molded part 13, and after the insertion, the intermediate part of the cross-sectional Z-shaped molded part 13 plays a role of preventing the disconnection.

Since the insertion guide portion 16 is provided and the cross-sectional Z-shaped molding portion 13 having elasticity is molded into one piece of the connection conductor 4, it takes time and labor to solder a capacitor lead wire or attach a crimp terminal. Instead, the capacitor leads can be connected and fixed with a single touch. Further, since the cross-sectional Z-shaped molding portion 13 is also provided with the drawer guide portion 19, the lead wire can be easily removed. 1, 2, 6, 7, and 10 show an example in which one cross-sectional Z-shaped molded portion 13 is provided on one piece of the connection conductor 4. As shown, it is also possible to provide two or more cross-sectional Z-shaped molded parts 13. In the above description, the cross-sectional Z-shaped molding portion 13 has been described. However, the insertion guide portion 16 that slides the lead wire 9 to guide between the plate-like portion of the connection conductor 4 and the cross-sectional Z-shaped molding portion 13 (molded portion). In addition, it is not always necessary to mold the lead wire 9 into a Z-shaped cross section as long as the lead guide portion 19 for pulling out the lead wire 9 is provided and the lead wire 9 is sandwiched and fixed by the stress of the molding portion and the plate-like portion. .

In addition, since the lead wire 9 is pushed into the cross-sectional Z-shaped molded part 13 in a direction perpendicular to the longitudinal direction of the lead wire 9, the contact area between the lead wire 9 and the connecting conductor 4 increases, and the heat generation becomes low, There is an effect that the surge voltage absorbability is improved.

On the other hand, in FIG. 6 to FIG. 8, the other part of the connection conductor 4, that is, the connection part with the switching element is formed in a U-shape, and the U-shaped sheet metal molding part 11 in which the holes are formed on both the upper and lower sides of the U-shape. Have. Further, as shown in FIG. 1, the resin case 3 is also provided with a conductor fitting portion 10 which is a protruding portion for fixing to the switching element 14a, and has a hole for passing a screw.

1 and 11, when the resin case 3 and the connection conductor 4 are connected to the switching element 14a, the conductor fitting portion 10 of the resin case 3 is inserted into the U-shaped space of the U-shaped sheet metal molding portion 11 of the connection conductor 4. It is possible to fix the resin case 3 and the connection conductor 4 by screwing them to the switching element 14a with screws 15 in a lump.

Here, since the U-shaped sheet metal molding part 11 is provided in the connection conductor 4, that is, the front and back of the conductor fitting part 10 whose section is formed in an I shape is sandwiched between the U-shaped sheet metal molding parts 11 of the conductor. Since the screws are tightened, it is possible to prevent deformation and breakage of the resin due to the screw tightening rotational torque when the resin case 3 is directly fixed to the switching element 14a with the screws 15. 1, FIG. 2, FIG. 6, FIG. 7 and FIG. 9 are obtained by molding the U-shaped sheet metal molding part 11 on the upper side, but it is also possible to mold it on the lower side as shown in FIG.

According to the snubber device of the first embodiment as described above, the connecting conductor 4 is provided with the cross-sectional Z-shaped molded portion 13, and the cross-sectional Z-shaped molded portion 13 is generated between the plate-shaped portions of the connecting conductor 4 that are not processed. This makes it easy to insert the lead wire 9 of the capacitor 2a between the plate-like portion of the connecting conductor 4 and the cross-section Z-shaped molded portion 13 with a single touch, and prevents the lead wire 9 from coming off after the insertion. It is possible to save the trouble of soldering or attaching the crimp terminal to the switching element, and at the same time, there is an effect that the connectivity between the lead wire 9 of the capacitor 2a and the switching element 14a is improved.

In addition, it is not necessary to install insulation tubes and crimp terminals, which are necessary when using general lead-type capacitors, and because there is no need for manual work such as bond fixing for vibration countermeasures or resin molding, reducing man-hours. And it is possible to improve the quality stability.

Further, since the lead wire 9 is pushed into the Z-shaped molded section 13 in a direction perpendicular to the longitudinal direction of the lead wire 9, the lead wire 9 is fixed to the connecting conductor 4 on the surface, heat generation is reduced, and surge voltage is reduced. There is an effect of improving the absorbability of.

Moreover, since the front and back of the conductor fitting portion 10 of the resin case 3 are sandwiched between the conductors and tightened with screws, the resin case 3 is deformed or damaged due to the rotational torque of the screw tightening when the resin case 3 is directly fixed to the switching element 14a with the screws 15. Can be prevented.

Moreover, it is possible to cope with different height sizes of the capacitor 2a, so that the mold cost can be reduced and the man-hours can be reduced.

In addition, a special capacitor such as a resin molded product for insulation is not required, and an inexpensive snubber device can be provided.

Embodiment 2. FIG.
The configuration of the second embodiment will be described. Note that the same configurations as those in Embodiment 1 are omitted as appropriate.
FIG. 12 is an exploded view showing the snubber device according to Embodiment 2 of the present invention, and FIG. 13 is a connection completion diagram of the snubber device. 12 and 13, the snubber device includes a resin case 16, a capacitor 2 a, and a connection conductor 19.

From the capacitor 2a, two lead wires 9 are extended from the end of the element. Further, the pair of resin cases 16 are molded products in which holes are formed according to various sizes of capacitors including the size of the capacitor 2a so that the resin case 16 can be inserted (fixed and fixed) into the capacitor 2a from both longitudinal sides of the capacitor 2a. . And the hole provided in the resin case 16 does not penetrate the resin case 16, and the insulation of the capacitor 2a is maintained. Further, when the resin case 16 is inserted into the capacitor 2 a, a lead drawing slit 18 for taking out the lead wire 9 of the capacitor 2 a from the resin case 16 so that the lead wire 9 of the capacitor 2 a is not caught by the resin case 16 is provided on the side surface of the resin case 16. It is provided so as to extend in the insertion direction.

Further, the resin case 16 is provided with a step-shaped molded portion 22 having a stepped shape as shown in FIG. 14A or a taper-shaped portion 23 having a tapered shape as shown in FIG. 14B. Yes.

Capacitors

2a and 2b having different sizes can be inserted as shown in FIGS. 17 (a1) and (b1) and FIGS. 17 (a2) and (b2), and different sizes can be inserted as shown in FIGS. 18 (a) and 18 (b). A snubber device can be realized.

FIG. 15 is a side view showing the relationship between the screw holes of the resin case 16 and the screw holes of the connection conductor 19, and FIG. 16 is a development view showing the structure of the connection conductor 19.
12 and 15, the resin case 16 is provided with a plurality of screw holes 17 for connecting conductors at equal intervals in the direction in which the capacitor 2 a is inserted into the resin case 16 above and below the lead wire drawing slit 18. Then, the connection conductor 19 is screwed in any hole provided in the upper part or the lower part of the lead wire drawing slit 18. On the other hand, case connection holes 20 are formed in the connection conductor 19 at intervals equal to the intervals of the conductor connection screw holes 17, and the connection conductor 19 is fixed to the resin case 16 with screws 29. That is, basically, the conductor connection screw hole 17 provided at a position farther from the capacitor 2a inserted into the resin case 16 is selected as the interval between the terminals of the switching element becomes wider.

Also, one piece of the L-shaped connecting conductor 19 is provided with a Z-shaped molded portion 13 in cross section, and the other piece is provided with a device attachment hole 21 (elongate hole) for attachment to the switching element 14a. The device mounting hole 21 is a long hole having substantially the same length as the gap between the conductor connecting screw holes 17 described above and extending in the insertion direction of the resin case 16. Fine adjustments can be made within the range. A piece of plate-like portion (not shown) of the connection conductor 19 is screwed to the terminal of the switching element 14a through the device attachment hole 21. Here, since the configuration can be adjusted at the device mounting hole 21 and the position of the connecting conductor 19 at the plurality of conductor connecting screw holes 17, the adjustment of only the device mounting hole 21 and the plurality of conductor connecting screws are possible. It is possible to finely adjust the position of the connection conductor 19 as compared with the adjustment of only the hole 17. In addition, since a plurality of conductor connection screw holes 17 are provided, it is not necessary to increase the length of the device mounting hole 21 in the longitudinal direction, and the component size of the connection conductor 19 can be reduced.

FIG. 19A is an oblique projection showing the connection state of the snubber device when the distance between the connection terminals of the switching element is small, and FIG. 19B is the case where the distance between the connection terminals of the switching element is large. It is an oblique projection figure which shows the connection state of this snubber apparatus.
In the case of the switching element 14b composed of one IGBT as shown in FIG. 19A, the size of the capacitor 2a and the like are also affected. For example, the screws 15 are formed inside the conductor connection screw holes 17 of the pair of connection conductors 19. It is fixed by. In addition, in the case of the 6in1 type switching element 14c in which six IGBTs are set as one set as shown in FIG. 19B, the size of the capacitor 2b and the like are also affected, but for example, conductor connection screws of the pair of connection conductors 19 The outer sides of the holes 17 are fixed by screws 15.

The connecting portion of the connecting conductor 19 for connecting the lead wire 9 of the capacitor 2a is provided in one piece of the L-shaped cross section Z-shaped molding portion 13 provided in one piece of the L-shaped connecting conductor 19 as in the first embodiment. The sheet metal part between the pair of slits 12 is provided with a Z-shaped molded part formed by bending the section into a Z-shaped cross section, and the connection of the capacitor lead wires is the same as in the first embodiment.

According to the snubber device of the second embodiment as described above, since a stepped or tapered structure is provided inside the resin case 16, capacitors of different sizes can be inserted, and a snubber device of different sizes can be realized. Is possible.

Further, the mounting position of the connection conductor 19 to the resin case 16 can be changed by a plurality of screw holes of the conductor connection screw holes 17 spaced at equal intervals in the resin case 16, and a device mounting hole 21 that can be finely adjusted. With this long hole, it is possible to attach the snubber device to the switching elements having different attachment positions.

In addition, since the conductor connection screw holes 17 of the resin case 16 are formed above and below the slit, the resin case 16 has no left-right direction and can be configured by only one component.

DESCRIPTION OF SYMBOLS 1

Resin molding lid

2a,

2b Capacitor

3, 16

Resin case

4, 19 Connection conductor 5 S-shaped resin molding part 6 S-shaped

molding part

7, 8 Lid connection hole 9 Lead wire 10 Conductor fitting part 11 U-shape Sheet metal molding part 12 Slit 13 Cross section Z-shaped

molding part

14a, 14b,

14c Switching element

15, 29 Screw 16 Insertion guide part 17 Conductor connection screw hole 18 Lead extraction slit 19 Drawer guide part 20 Case connection hole 21 Device mounting hole 22 Stepped molding part 23 Tapered molding part

Claims

A capacitor having a lead wire and absorbing the surge voltage generated by the switching element through the lead wire;
A resin case for fitting and fixing the capacitor;
A connection conductor formed of a conductor, one piece is fixed to the resin case, and the other piece is connected to a different terminal of the switching element, and
The lead wire is sandwiched between the plate-shaped portion of the piece of the connection conductor excluding the molded portion and the molded portion by the deformation of the molded portion formed by processing one piece of the connection conductor, and is fixed to the connection conductor. Snubber device characterized by that.
The U-shaped molded part molded on the other piece of the connection conductor and a part of the resin case are provided with screw holes connected to the terminals of the switching element by screws, and a part of the resin case is 2. The snubber device according to claim 1, wherein the snubber device is sandwiched between U-shaped molded portions, and the connection conductor and the resin case are collectively screwed to the terminals.
The snubber device according to claim 1 or 2, further comprising a resin-molded lid that fits the resin case and fixes the capacitor inserted into the resin case.
3. The snubber device according to claim 1 or 2, wherein an elastic member is provided on the opposing inner wall of the resin case, and the elastic member is deformed to sandwich the capacitor.
The snubber device according to claim 1, wherein the inside of the pair of resin cases is molded into a stepped shape or a tapered shape.
6. The snubber device according to claim 5, wherein a slit for providing the lead wire of the capacitor to the outside of the resin case is provided in the resin case.
The plate portion of one piece of the connection conductor is fixed to any one of a plurality of screw holes provided in the direction in which the capacitor of the resin case is inserted into the resin case, and the other piece of the connection conductor is the plurality of pieces. 7. The snubber device according to claim 5, wherein the snubber device is screwed to a terminal of the switching element through an elongated hole extending in parallel with a direction in which the screw holes are arranged.