JP2019004120A - Capacitor and inspection method of the same - Google Patents

Abstract

To provide a capacitor capable of easily switching a connection state between a capacitor element and a discharge resistor and reducing cost.SOLUTION: The capacitor is formed by encapsulating with a resin a capacitor element 2. The capacitor includes a discharge resistor 6 having a pair of positive and negative lead wires 6a, 6b outside a resin 9. Connecting means 7 for connecting to one lead wire 6a of the discharge resistor 6 is drawn out from one electrode 2a of the capacitor element 2 to outside the resin 9. The other lead wire 6b of the discharge resistor 6 and the other electrode 2b of the capacitor element 2 are connected in the resin 9.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a capacitor having a discharge resistor.

  A capacitor having a discharge resistor has been known. For example, Patent Document 1 discloses a capacitor in which a discharge resistor and a capacitor element are connected in parallel and both are resin-molded.

JP-A-5-217801

  By the way, in the capacitor having the above configuration, the capacitor element and the discharge resistor are connected within the resin, and it is substantially impossible to release the connection state between the capacitor element and the discharge resistor after the product is completed. Therefore, in the completion inspection, the insulation resistance of the capacitor element could not be measured without being affected by the discharge resistance.

  For example, if the discharge resistor is arranged outside the resin, and the positive and negative lead wires are drawn out of the resin from the capacitor element, and the discharge resistor and the capacitor element are detachably connected via a connector or a terminal, Connection / non-connection of the capacitor element and the discharge resistor can be easily switched. However, in this case, the number of parts and man-hours increase, leading to high costs.

  Therefore, an object of the present invention is to provide a capacitor that can easily switch the connection state between the capacitor element and the discharge resistor and can reduce the cost.

  The capacitor of the present invention is a capacitor in which the capacitor element 2 is resin-sealed, and includes a discharge resistor 6 having a pair of positive and negative lead wires 6 a and 6 b outside the resin 9, and one lead wire 6 a of the discharge resistor 6. Is connected to the outside of the resin 9 from one electrode 2a of the capacitor element 2, and the other lead wire 6b of the discharge resistor 6 and the other electrode 2b of the capacitor element 2 are connected to the resin. 9 is connected. Moreover, one lead wire 6a of the discharge resistor 6 and the connecting means 7 may be detachably connected.

  The capacitor inspection method of the present invention is a method for inspecting a capacitor having the above-described configuration. Before the inspection, one lead wire 6a of the discharge resistor 6 and the connecting means 7 are separated, and after the inspection, the discharge resistor 6 The one lead wire 6a is connected to the connecting means 7.

  In the capacitor of the present invention, since the connecting means for connecting to one lead wire of the discharge resistor is drawn out of the resin from one electrode of the capacitor element, the connection state between the discharge resistor and the capacitor element can be easily achieved. The insulation resistance of the capacitor can be measured and the characteristics of the discharge resistance can be confirmed without being affected by the discharge resistance. In addition, since the other lead wire is connected to the other electrode plate of the capacitor element within the resin, the structure is simpler than when both lead wires and the capacitor element are connected outside the resin, and the number of parts is reduced. And man-hours can be reduced, leading to lower costs. If one lead wire of the discharge resistor and the connecting means are detachably connected, the connection state between the discharge resistor and the capacitor element can be switched more easily, and the inspection is easy to perform.

  If it is the test | inspection method of the capacitor | condenser of this invention, the insulation resistance of a capacitor | condenser can be measured and the characteristic of discharge resistance can be confirmed, without being influenced by discharge resistance.

It is a disassembled perspective view of the capacitor | condenser which concerns on one Embodiment of this invention. It is a perspective view which shows the connection state of a capacitor | condenser element and discharge resistance. It is a perspective view of a capacitor. It is a perspective view of another capacitor | condenser.

  Next, an embodiment of this capacitor will be described in detail with reference to the drawings. As shown in FIGS. 1 to 3, the capacitor 1 of the present invention includes a plurality of capacitor elements 2, an electrode plate 3 for commonly connecting the capacitor elements 2, a discharge resistor 6, and one of the discharge resistors 6. Connection means 7 for connecting one of the capacitor elements 2, a case 8 for housing the capacitor element 2 and the electrode plate 3, and filling the case 8 to seal the capacitor element 2 and the electrode plate 3. Resin 9 is provided. Hereinafter, each component will be described in detail.

  The capacitor element 2 is a film capacitor formed by winding a metallized film in which a metal is vapor-deposited on an insulating film, for example, and is formed by spraying metal on both end surfaces in the axial direction as shown in FIG. Metallicon electrodes 2a and 2b are respectively formed. The capacitor element 2 has an elliptical shape on both end surfaces in the axial direction (two parallel straight lines and a semicircle connecting both ends of the capacitor element: a track shape for athletics). A flat surface 2c is formed at a portion corresponding to “a parallel line of books”, and a curved surface (R portion) 2d protruding outward is formed at a portion corresponding to “semicircle”. The capacitor element 2 is not limited to a film capacitor, and various capacitor elements 2 such as a ceramic capacitor may be used. Regarding the shape, various shapes such as a columnar shape and a prismatic shape can be adopted.

  The electrode plate 3 includes a first electrode plate 4 connected to one electrode 2 a of the capacitor element 2 and a second electrode plate 5 connected to the other electrode 2 b of the capacitor element 2. The electrode plate 3 is made of, for example, copper or aluminum, but is not limited thereto, and various materials can be used as long as they are conductive.

  As shown in FIG. 1, the first electrode plate 4 has a substrate portion 4 a sized to cover the electrodes 2 a of the capacitor elements 2 arranged in parallel, and upward from the long side of the substrate portion 4 a. The three external connection parts 4b extended are provided. The board portion 4a is provided with a tongue-like connection piece 4c at a position facing the electrode 2a of the capacitor element 2 so as to be easily soldered to the electrode 2a. A tongue-like lead wire connecting piece 4d for connecting a connecting means (lead wire) is provided on the long side of the substrate portion 4a opposite to the side on which the external connection portion 4b is extended. The lead wire connecting piece 4d is provided so as to be positioned between the R portions 2d and 2d of the capacitor elements 2 adjacent to each other in a plan view in a state where the plurality of capacitor elements 2 and the first electrode plate 4 are connected. Yes.

  As shown in FIG. 1, the second electrode plate 5 is disposed below the capacitor element 2, and therefore, unlike the first electrode plate 4, the substrate portion 5 a has a substantially L shape in side view. Further, the external connection portion 5 b is provided in a shifted state so as not to overlap the external connection portion 4 b of the first electrode plate 4. Since other configurations are substantially the same as those of the first electrode plate 4, the same suffixes are attached and detailed description thereof is omitted.

  The discharge resistor 6 is for discharging the electric charge stored in the capacitor element 2. As shown in FIG. 1, the discharge resistor 6 includes a pair of positive and negative lead wires 6a and 6b. Of the pair of positive and negative lead wires 6a and 6b, one lead wire 6a is connected to one electrode 2a of the capacitor element 2 via the connecting means 7 and the first electrode plate 4 outside the resin 9, and the other The lead wire 6 a is connected to the other electrode 2 b of the capacitor element 2 through the second electrode plate 5 in the resin 9.

  As shown in FIG. 1 or FIG. 2, the connecting means 7 is a lead wire separate from the lead wires 6 a and 6 b of the discharge resistor 6. An annular crimp terminal 7a is attached to the lead wire at an end portion on the side drawn out from the resin 9 (case 8). Similarly, an annular crimp terminal 6 c is attached to one lead wire 6 a of the discharge resistor 6. The lead wires 6a and 6b of the discharge resistor 6 and the lead wires as the connecting means 7 are so-called coatings in which the surface of a single wire or a stranded wire of a conductive material such as copper or aluminum is covered with a flexible synthetic resin. Lead wire. However, an uncoated lead wire may be used. As a property, a material having flexibility and being easily bent is preferable.

  The case 8 includes a rectangular bottom portion 8a and side walls 8b each rising from four sides of the bottom portion 8a, and as a whole, has a hollow, substantially rectangular parallelepiped shape having an opening 8c on the upper side. As shown in FIG. 1, a base 8 d for connecting the crimp terminal 7 a of the connecting means 7 and the crimp terminal 6 c of the discharge resistor 6 is provided on the outer surface of one side wall 8 b. An insert nut is embedded in the pedestal 8d, and the crimp terminals 6c and 7a can be connected to each other by screwing a screw 10. The case 8 is made of, for example, a hard synthetic resin, but may be made of metal as long as insulation with the capacitor element 2 and the electrode plate 3 can be secured. The resin 9 filled in the case 8 is, for example, an epoxy resin. However, the present invention is not limited to this, and various known resins such as urethane resins can be used.

  Next, a method for manufacturing the capacitor 1 of the present invention will be described. First, a plurality of capacitor elements 2 are arranged side by side so that the electrodes 2a and 2b face in the vertical direction and the flat surfaces 2c and 2c face each other.

  Next, one electrode 2 a (upper side in FIG. 1) of each capacitor element 2 is commonly connected by the first electrode plate 4. Similarly, the other electrode 2 b (downward in FIG. 1) of each capacitor element 2 is commonly connected by the second electrode plate 5. For connection, various connection methods such as soldering and spot welding can be employed.

  Next, the lead wire which is the connection means 7 for connecting to one lead wire 6a of the discharge resistor 6 is connected to the lead wire connecting piece 4d of the first electrode plate 4 by soldering or the like. Further, the other lead wire 6b of the discharge resistor 6 is connected to the lead wire connecting piece 5d of the second electrode plate 5 by soldering or the like. In this state, the discharge resistor 6 and the capacitor element 2 are not electrically connected.

  Then, the capacitor element 2 and the electrode plate 3 are accommodated in the case 8 so that the external connection portions 4 b and 5 b of the electrode plates 4 and 5 protrude from the opening 8 c above the case 8 to the outside of the case 8. At this time, the discharge resistor 6 is positioned outside the case 8 except for a part of the other lead wire 6b. As for the lead wire as the connecting means 7, the side opposite to the side connected to the lead wire connecting piece 4 d of the first electrode plate 4 is drawn out of the case 8. Thereafter, the resin 9 is filled in the case 8 until the capacitor element 2 and the electrode plate 3 (excluding the external connection portions 4b and 5b) are located below the resin surface, and the capacitor element 2 is sealed with the resin. Complete manufacturing.

  Since the capacitor 1 having the above-described configuration has one lead wire 6a of the discharge resistor 6 and the crimp terminal 7a side of the connection means 7 (the connection side with the lead wire 6a) positioned outside the resin 9, the discharge resistor 6 The connection state with the capacitor element 2 can be easily switched. In particular, since the compression terminals 6c and 7a are used, the connection state between one lead wire 6a of the discharge resistor 6 and one electrode 2a of the capacitor element 2 can be achieved simply by screwing or removing the screw 10. Can be switched easily. Therefore, before the inspection, one lead wire 6a of the discharge resistor 6 and the connecting means 7 can be disconnected (not connected) and connected after the inspection, so that the discharge resistor 6 and the capacitor can be easily connected. Each element 2 can be inspected separately. On the other hand, since the other lead wire 6b of the discharge resistor 6 and the other electrode 2b of the capacitor element 2 are connected in the resin 9 (case 8), there is no need to provide a crimp terminal or the like. Cost reduction can be achieved. Further, since the entire lead wire 6a, a part of the lead wire 6b, and a part of the connecting means 7 are located outside the resin 9, the heat of the discharge resistor 6 is not easily transmitted to the capacitor element 2, and the capacitor element 2 Deterioration due to heat can be suppressed.

  FIG. 4 shows another capacitor 11. In this capacitor 11, the connection means for connecting to one lead wire 6 a of the discharge resistor 6 is the external connection portion 4 b of the first electrode plate 4 drawn out of the resin 9. With such a configuration, when the external connection portion 4b is screwed to an external device, one lead wire 6a of the discharge resistor 6 and the external connection portion 4b can be connected (joint tightened) together, Reduces man-hours. Moreover, since the external connection part 4b becomes a "pedestal", it is not necessary to provide a separate pedestal. Other configurations are the same as those of the capacitor 1. For example, the other electrode 6 b of the discharge resistor 6 is directly connected to the lead wire connecting piece 5 d of the second electrode plate 5 in the resin 9.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. For example, in the above embodiment, a pair of positive and negative electrode plates is used, but either one or both electrode plates are not used, and the discharge resistor 6 and the capacitor element 2 are directly connected (without the electrode plate). May be. Further, the connection between the one lead wire 6a of the discharge resistor 6 and the connection means 7 is detachably connected by the screw 10. However, the connection is not limited to screwing, but various known detachable connections such as connection by a connector. A method may be employed. Also, soldering may be used. In the case of soldering, individual inspection of the discharge resistor 6 and the capacitor element 2 is performed before soldering, and soldering is performed after the inspection. Further, the connection means 7 is connected to the first electrode plate 4 or the external connection portion 4b of the first electrode plate 4 is used as the connection means, but the first electrode plate 4 and the second electrode plate 5 are replaced, that is, The connection means 7 may be connected to the second electrode plate 5, or the external connection portion 5b of the second electrode plate 5 may be used as the connection means.

1, 11 Capacitor 2 Capacitor element 2a One metallicon electrode 2b The other metallicon electrode 2c Flat surface 2d Curved surface (R portion)
3 Electrode plate 4 First electrode plate 4a Substrate portion 4b External connection portion 4c Connection piece 4d Lead wire connection piece 5 Second electrode plate 5a Substrate portion 5b External connection portion 5c Connection piece 5d Lead wire connection piece 6 Discharge resistor 6a One lead Wire 6b The other lead wire 6c Crimp terminal 7 Connection means (lead wire)
7a Crimp terminal 8 Case 8a Bottom 8b Side wall 8c Opening 8d Base 9 Resin 10 Screw

Claims (3)

A capacitor in which the capacitor element (2) is sealed with resin,
A discharge resistor (6) having a pair of positive and negative lead wires (6a, 6b) is provided outside the resin (9),
A connection means (7) for connecting to one lead wire (6a) of the discharge resistor (6) is drawn out of the resin (9) from one electrode (2a) of the capacitor element (2), and
A capacitor characterized in that the other lead wire (6b) of the discharge resistor (6) and the other electrode (2b) of the capacitor element (2) are connected within a resin (9). The capacitor according to claim 1, wherein one lead wire (6a) of the discharge resistor (6) and the connecting means (7) are detachably connected. A method for inspecting a capacitor according to claim 1 or 2,
Before the inspection, one lead wire (6a) of the discharge resistor (6) and the connection means (7) are separated,
A method for inspecting a capacitor, characterized in that, after the inspection, one lead wire (6a) of the discharge resistor (6) is connected to the connecting means (7).

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