JP2006019333A - Terminal connecting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal connecting structure which can improve current carrying capacity easily by a simple structure and has a good heat dissipation effect. <P>SOLUTION: The terminal connecting structure is for connecting capacitor terminals 1 to electrodes 3 of a capacitor element 2. The capacitor terminals 1 are each constructed by stacking a plurality of plate-like terminals 5 and 6. The plate-like terminals 5 and 6 of each capacitor terminal 1 are directly connected to the electrodes 3 of the capacitor element 2, and hence the entire thickness of each of the plate-like terminals 5 and 6 can be used as a region to cause a current to flow therein. The plurality of plate-like terminals 5 and 6 of the capacitor terminal 1 are connected to the same external terminal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a terminal connection structure, and more particularly to a terminal connection structure for connecting a capacitor terminal to an electrode of a capacitor element.

A plate-like terminal is often used for the lead-out portion of a snubber or filter capacitor to increase current capacity (see, for example, Patent Document 1). FIG. 4 shows a plate-like terminal 52 connected to two capacitor elements 51 and 51 (film capacitor elements and the like) arranged side by side. In this case, as shown in FIG. 5, the plate-like terminal 52 is formed of a rectangular flat plate and has connection portions 53 and 53 on a pair of sides thereof. And as shown in FIG. 4, the connection parts 53 and 53 of the plate-shaped terminal 52 are connected to the metallicon electrodes 54 and 54 of a pair of capacitor elements 51 and 51 arranged in parallel by soldering or spot welding.
JP 2003-133172 A

  Since the plate-like terminal 52 as described above is a rectangular flat plate, current capacity can be obtained with a large surface area. However, when the operating frequency of the capacitor is in a high frequency region (region of 20 kHz or more), the entire thickness of the plate-like terminal 52 cannot be utilized for a region where current flows because of the skin effect. For example, as shown in FIG. 6, if the thickness D of the plate-like terminal 52 is 1 mm, the skin depth d through which current flows at a frequency of 50 kHz is about 0.3 mm, and the skin portions 52a on the front and back of the plate-like terminal 52 , 52b, the current flows only in the range of about 0.6 mm. For this reason, the central portion 52c of the plate-like terminal 52 is in a range that does not contribute to the current capacity. In such a case, the current concentrates and heat generation becomes large. Therefore, in order to avoid this, it is necessary to take measures to dissipate heat such as making the terminal with a larger surface area. However, if the surface area of the plate-like terminal 52 is increased, there are disadvantages such as an increase in the size of the capacitor.

  The present invention has been made to solve the above-described conventional drawbacks, and an object of the present invention is to provide a terminal connection structure that can easily improve the current capacity with a simple configuration and has a good heat dissipation effect.

  The terminal connection structure according to claim 1 is a terminal connection structure in which the capacitor terminal 1 is connected to the electrode 3 of the capacitor element 2, and a plurality of plate-like terminals 5, 6 are stacked to constitute the capacitor terminal 1. Each of the plate-like terminals 5 and 6 of the terminal 1 is directly connected to the electrode 3 of the capacitor element 2.

  In the terminal connection structure according to the first aspect, each plate-like terminal 5, 6 of the capacitor terminal 1 is connected to the electrode 3. Therefore, if a high-frequency current (for example, 50 kHz) is passed through the capacitor terminal 1, This high frequency current flows through the terminals 5 and 6. For this reason, the whole thickness of each plate-shaped terminal 5 and 6 can be utilized for the area | region where an electric current flows.

  The terminal connection structure according to claim 2 is characterized in that the plurality of plate-like terminals 5 and 6 of the capacitor terminal 1 are connected to the same external terminal.

  In the terminal connection structure according to the second aspect, when a high frequency current (for example, 50 kHz) is supplied to the external terminal, the high frequency current flows to each of the plate-like terminals 5 and 6 via the external terminal. For this reason, a high frequency current is stably supplied to the capacitor constituted by this terminal connection structure.

  According to the terminal connection structure of the first aspect, the entire thickness of each plate-like terminal can be utilized in a region where current flows. For this reason, for example, when there are two plate-like terminals and the thickness of each plate-like terminal is 0.5 mm, the thickness of the two plate-like terminals is superposed in consideration of the back and front of the capacitor terminal. A certain 1 mm portion is effective as a part contributing to the current capacity. For this reason, in this terminal connection structure, the current capacity can be improved. In addition, since the portion that does not contribute to the current capacity can be reduced, heat generation due to current concentration can be reduced. For this reason, when this terminal connection structure is compared with that in which the capacitor terminal is composed of a single plate-like terminal, this terminal connection structure is excellent in the heat dissipation effect. Thus, if this terminal connection structure is used, a current capacity can be easily improved with a simple configuration, and a capacitor having a good heat dissipation effect can be provided.

  According to the terminal connection structure of the second aspect, when a high-frequency current is passed through the external terminal, the high-frequency current flows through the plate-like terminals 5 and 6. For this reason, since a high frequency current is stably supplied to the capacitor constituted by the terminal connection structure, the current capacity can be further improved.

  Next, specific embodiments of the terminal connection structure of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a capacitor using the terminal connection structure of the present invention. In this terminal connection structure, the capacitor terminal 1 is connected to the metallicon electrode 3 of the capacitor element 2. At that time, the capacitor terminal 1 includes a first plate-like terminal 5 and a second plate-like terminal 6 as shown in FIGS. The first plate-like terminal 5 is composed of a main body portion 7 made of a rectangular flat plate and connecting portions 9a and 9b projecting from opposite sides 8a and 8b of the main body portion 7, respectively. Further, the second plate-like terminal 6 is also protruded from the main body portion 10 made of a rectangular flat plate and the opposite sides 11a and 11b of the main body portion 10 (protrusions) connecting portions 12a and 12b. It consists of. In this case, the main body portion 7 of the first plate-like terminal 5 and the main body portion 10 of the second plate-like terminal 6 have substantially the same outer shape, size, and thickness, and the first plate-like terminal. 5 and the second plate-like terminal 6 substantially coincide with each other. In addition, the 1st plate-shaped terminal 5 and the 2nd terminal 6 consist of metal conductors, and the through-holes 13 and 14 are provided in each main-body part 7 and 10, respectively. This capacitor may be housed in a case or resin molded.

  In this case, the capacitor terminal 1 is configured by superimposing the first plate-like terminal 5 and the second plate-like terminal 6. However, as shown in FIG. 2, as shown in FIG. The connecting portions 9a and 9b and the connecting portions 12a and 12b of the second plate-like terminal 6 are not opposed to each other and are shifted in the longitudinal direction. That is, in the illustrated example, the connection portions 9 a and 9 b of the first plate-like terminal 5 are located above the connection portions 12 a and 12 b of the second plate-like terminal 6.

  As shown in FIG. 1, the capacitor terminal 1 composed of the first plate-like terminal 5 and the second plate-like terminal 6 is made up of two capacitor elements 2 and 2 arranged in parallel, as shown in FIG. The connecting portions 9a, 9b, 12a, and 12b are connected to each other. That is, one connection portion 9a, 12a is connected to the electrode 3 of one capacitor 2 (2A), and the other connection portion 9b, 12b is connected to the electrode 3 of the other capacitor 2 (2B). As a connection method in this case, it can be performed by soldering, spot welding or the like. An external terminal (not shown) is connected to each capacitor terminal 1, 1. That is, each capacitor terminal 1, 1 has its first plate-like terminal 5 and second plate-like terminal 6 connected to the same external terminal. For this reason, a high frequency current is supplied to the capacitor from the outside by the external terminal.

  In the above capacitor, the plate-like terminals 5 and 6 are connected to the metallicon electrode 3, respectively. Therefore, a high-frequency current (for example, 50 kHz) flows through the plate-like terminals 5 and 6, and the entire thickness of the plate-like terminals 5 and 6 is reduced. It can be used in areas where current flows. That is, when the thickness of each of the plate-like terminals 5 and 6 is set to 0.5 mm, for example, when the front and back of the capacitor terminal 1 are taken into consideration, the thickness of 1 mm which is the thickness of the two plate-like terminals 5 and 6 overlapped is 1 mm. This is an effective part that contributes to the current capacity. For this reason, in this terminal connection structure, the current capacity can be improved. Also, with this terminal connection structure, the portion that does not contribute to the current capacity can be reduced, so that heat generation due to current concentration can be reduced. For this reason, when this terminal connection structure is compared with that in which the capacitor terminal is composed of a single plate-like terminal, this terminal connection structure is excellent in the heat dissipation effect.

  Although specific embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention. For example, the number of the capacitor elements 2 may be one or three or more. The capacitor element 2 is not limited to a film capacitor, and may be another capacitor element such as a ceramic capacitor. Furthermore, the shape of each of the plate-like terminals 5 and 6 may be various shapes such as a strip shape other than the rectangular shape and an elliptical shape. Further, the number of the plate-like terminals 5 and 6 to be overlapped is not limited to two, but may be three or more. The thickness of each of the plate-like terminals 5 and 6 also flows through the entire thickness. It can be changed arbitrarily within the range that can be used for the area. In the above embodiment, the first plate-like terminal 5 is arranged on the electrode side and the second plate-like terminal 6 is arranged on the counter electrode side. However, the second plate-like terminal 6 is arranged on the electrode side. The first plate-like terminal 5 may be arranged on the side opposite to the electrode while being arranged on the side. In addition, it is also possible to superimpose the number of plate-like terminals corresponding to the capacitor elements arranged in parallel and connect each plate-like terminal to a separate capacitor element. That is, when two capacitor elements are used, the number of plate terminals is also two, and one connection portion is provided for each plate terminal, and one plate terminal connection portion is provided for one capacitor element electrode. And the connecting portion of the other plate-like terminal may be connected to the electrode of the other capacitor element.

It is a perspective view of the capacitor using the terminal connection structure of this invention. It is a perspective view of the plate-shaped terminal of the said terminal connection structure. It is a perspective view of the decomposition | disassembly state of the said plate-shaped terminal. It is a perspective view of the capacitor | condenser using the said conventional terminal connection structure. It is a perspective view of the conventional terminal connection structure plate terminal. It is a principal part enlarged view of the plate-shaped terminal which shows the problem of the conventional terminal connection structure.

Explanation of symbols

  1 .. Capacitor terminal, 2 .... Capacitor element, 3 .... Electrode, 5, 6 .... Plate terminal

Claims (2)

  A terminal connection structure for connecting a capacitor terminal (1) to an electrode (3) of a capacitor element (2), wherein a plurality of plate-like terminals (5) and (6) are stacked to constitute a capacitor terminal (1), A terminal connection structure, wherein each plate-like terminal (5) (6) of the capacitor terminal (1) is directly connected to the electrode (3) of the capacitor element (2).   2. The terminal connection structure according to claim 1, wherein the plurality of plate-like terminals (5) and (6) of the capacitor terminal (1) are connected to the same external terminal.