JP5125582B2 - Case mold type capacitor - Google Patents

Description

  INDUSTRIAL APPLICABILITY The present invention is used in various electronic equipment, electrical equipment, industrial equipment, automobiles, etc., and in particular, a metallized film capacitor that is optimal for smoothing, filtering, and snubbing of a motor drive inverter circuit of a hybrid car is contained in a case. And a resin-molded case mold type capacitor.

  In recent years, from the viewpoint of environmental protection, all electric devices are controlled by inverter circuits, and energy saving and high efficiency are being promoted. In particular, in the automobile industry, hybrid vehicles (hereinafter referred to as HEVs) that run on electric motors and engines have been introduced into the market, and the development of technologies relating to energy saving and high efficiency has been activated, which is friendly to the global environment.

  Since such a HEV electric motor has a high operating voltage range of several hundred volts, a metallized film capacitor having high withstand voltage and low loss electric characteristics as a capacitor used in connection with such an electric motor. In addition, the trend of adopting metalized film capacitors with a very long life is conspicuous due to the demand for maintenance-free in the market.

  And since the metallized film capacitor used for HEVs in this way is required to have a high withstand voltage, large current, large capacity, etc., a plurality of metallized films connected in parallel by bus bars. A case mold type capacitor in which a capacitor is housed in a case and a mold resin is poured into the case has been developed and put into practical use.

  9 is an exploded perspective view showing the structure of this type of conventional case mold type capacitor, FIG. 10 is a cross-sectional view taken along the line AA of FIG. 9, and in FIGS. 9 and 10, 10 is a metallized film capacitor. This capacitor 10 is a pair of metallized films in which metal vapor-deposited electrodes are formed on one or both sides of a dielectric film made of polypropylene, and the metal vapor-deposited electrodes are opposed to each other with the dielectric film interposed therebetween. In this state, a pair of extraction electrodes of P and N poles are provided respectively by forming metallicon electrodes with zinc sprayed on both end faces.

  Reference numeral 11 denotes a P-pole bus bar, and 11a denotes a P-pole terminal for external connection provided at one end of the P-pole bus bar 11. The P-pole bus bar 11 includes a plurality of capacitors 10 in close contact with each other. The P electrode 10 is joined to a P electrode formed on one end face, and the P electrode terminal 11a is pulled out above the capacitor 10 and exposed from a case 13 described later.

  Reference numeral 12 denotes an N-pole bus bar, and 12a denotes an N-pole terminal for external connection provided at one end of the N-pole bus bar 12. The N-pole bus bar 12 also includes a plurality of capacitors 10 in the same manner as the P-pole bus bar 11. The N pole electrodes formed on the other end face of each capacitor 10 are joined together in close contact, and the N pole terminal 12a is pulled out above the capacitor 10 and exposed from a case 13 described later. Thus, a plurality of capacitors 10 are connected in parallel connection by the P-pole bus bar 11 and the N-pole bus bar 12.

  Reference numeral 13 denotes a resin case, and reference numeral 14 denotes a mold resin filled in the case 13. The mold resin 14 is connected in parallel by the P-pole bus bar 11 and the N-pole bus bar 12. Is housed in the case 13 and resin molded.

  The conventional case mold type capacitor configured as described above is a highly reliable case mold type excellent in mechanical strength, heat resistance and water resistance by molding the capacitor 10 in the case 13 with the mold resin 14. Capacitors could be provided.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2004-146724 A

  When the conventional case mold type capacitor is mounted on an actual vehicle, as shown in FIG. 11, an independent noise removing capacitor 15 prepared separately is fastened to the P-pole terminal 11a and the N-pole terminal 12a. Since the circuit as shown in the figure is used by being externally attached, the space is increased in size and the cost is increased. There was a strong request from the user to have it built in a case mold type capacitor.

  However, when the noise removing capacitor 15 is built in a case mold type capacitor, the capacitor 10 resin-molded in the case 13 is a smoothing capacitor. If the capacitor 15 is connected in parallel by the P-pole bus bar 11 and the N-pole bus bar 12 and is resin-molded, the noise removing capacitor 15 cannot be subjected to a characteristic test alone.

  In addition, there is a problem that it is extremely difficult to solve the above-mentioned problems in a limited space, while downsizing is strongly demanded.

  An object of the present invention is to solve such a conventional problem and to provide a case mold type capacitor capable of independently inspecting the characteristics of the noise removing capacitor even if the noise removing capacitor is incorporated. It is.

  In order to solve the above problems, the present invention provides a case mold type capacitor in which first and second elements having different functions are connected in parallel with a bus bar, and these are housed in a case and resin molded. A connection portion is provided in a portion other than the filling portion, and two second elements are connected in series via the connection portion, and the connection portion is not connected to the bus bar of each second element. The other ends of the pair of connection bus bars having one end connected to each other are arranged close to each other in a non-contact state, and the other ends of the pair of connection bus bars are mechanically and electrically connected to each other by a connection bus bar.

  As described above, the case mold type capacitor according to the present invention has a configuration in which the connection bus bars connected to the two second elements are connected by the connection bus bar, and the connection bus bars before the connection bus bars are connected by the connection bus bar. In the state, since the two second elements are not electrically connected and are in an independent state, the second element can be individually characterized. After performing the characteristic inspection, all connections can be made simply by connecting the connecting bus bars with the connecting bus bar, so that it is possible to reduce the size with a simple configuration and to ensure excellent reliability. An effect is obtained.

(Embodiment)
Hereinafter, the invention described in the entire claims of the present invention will be described by using embodiments.

  FIG. 1 is a plan view showing a configuration of a case mold type capacitor before resin molding according to an embodiment of the present invention, FIG. 2 is a plan view showing a configuration of the case mold type capacitor after resin molding, and FIG. It is the circuit diagram which showed the structure of the same case mold type capacitor.

  1 to 3, 1 is a first metallized film capacitor (hereinafter referred to as a first element 1, and in this embodiment, a smoothing capacitor of an inverter circuit is used), and 2 is the first metal film capacitor. A second metallized film capacitor having a function different from that of the element 1 (hereinafter referred to as a second element 2, and a noise removing capacitor generally referred to as a Y-con in this embodiment is used) is shown. The element 1 and the second element 2 are a pair of metallized films in which metal vapor-deposited electrodes are formed on one or both sides of a dielectric film made of polypropylene, and the metal vapor-deposited electrodes face each other through the dielectric film. A pair of extraction electrodes of P and N poles are provided by winding and forming metallicon electrodes sprayed with zinc on both end faces.

  Reference numeral 3 denotes a P-pole electrode which is one electrode of the first element 1, and a P-pole bus bar connected to the P-pole electrode of one second element 2, and 3 a is provided at one end of the P-pole bus bar 3. The terminal portion 3a is drawn out above the first element 1 and exposed from a case 5 described later.

  Reference numeral 4 denotes an N-pole electrode which is the other electrode of the first element 1 and an N-pole bus bar connected to the N-pole electrode of the other second element 2. 4 a is provided at one end of the N-pole bus bar 4. The terminal portion 4a is pulled out above the first element 1 and exposed from a case 5 described later.

  Thus, as shown in the circuit diagram of FIG. 3, the first element 1 and the second element 2 are connected in parallel by the P-pole bus bar 3 and the N-pole bus bar 4. Details of the configuration in which the two second elements 2 are connected in series and connected to the ground will be described later.

  5 is a resin case, and 6 is a mold resin filled in the case 5. The mold resin 6 is connected in parallel by the P-pole bus bar 3 and the N-pole bus bar 4. The second element 2 is housed in a case 5 and is resin-molded. The terminal part 3a provided at one end of the P-pole bus bar 3 and the terminal part 4a provided at one end of the N-pole bus bar 4 are molded. It is intended to be exposed from the resin 6.

  Reference numeral 7 denotes a pair of connection bus bars, and 8 denotes a connection bus bar in which the pair of connection bus bars 7 are connected to each other via bolts 9 to form a connection portion. The connection portion is a filling portion of the case 5 in the mold resin 6 The structure of the connecting portion will be described in detail below with reference to FIGS. 4 to 8.

  4 (a) and 4 (b) are a plan view and a front view of the main part showing the structure before the connection part is connected, and FIGS. 5 (a) and 5 (b) are plan views of the main part showing the structure after the connection. FIG. 6 is a perspective view of the main part showing the configuration of the connection portion, and FIGS. 7A to 7D are a plan view and a front view showing the configuration of the connection bus bar forming the connection portion. A side view and a perspective view, and FIGS. 8A to 8D are a plan view, a front view, a side view, and a perspective view showing a configuration of a connecting bus bar that constitutes the connection portion.

  First, as shown in detail in FIG. 7, the connection bus bar 7 is provided with a soldering portion 7a soldered and joined to the P-pole electrode or the N-pole electrode of the second element 2 at one end and a tongue at the other end. A piece-like connecting portion 7b is provided at one end in the width direction, a main body portion having the soldering portion 7a and the connecting portion 7b at both ends is bent into a substantially trapezoidal shape, and the main body close to the connecting portion 7b The cut portion 7c is provided in the inclined portion of the portion.

  Further, the connecting bus bar 8 is formed in a U shape as shown in detail in FIG. 8, and through holes 8a are coaxially provided on both side surfaces, and two convex portions 8b are provided on the peripheral edge of one side surface. It is a thing of the structure provided in.

  The connection bus bars 7 configured in this way are made of two identical ones, and are connected to the electrodes on the side not connected to the P-pole bus bar 3 and the N-pole bus bar 4 of the two second elements 2, respectively. By soldering and joining via the soldering part 7a, the connecting part 7b at one end of the connection bus bar 7 is in a non-contact state on the flat part of the upper concave part 5a provided in the case 5, as shown in FIG. Closely arranged. When the connecting portions 7b of the pair of connection bus bars 7 are arranged close to each other in this way, the hole 5b provided in the upper concave portion 5a provided in the case 5 is exposed at the boundary portion. Is.

  Then, as shown in FIG. 5, the both side surfaces of the U-shaped connecting bus bar 8 are fitted into the upper concave portion 5 a and the lower concave portion 5 c provided in the case 5, so that it is non-planar on the plane of the upper concave portion 5 a. A hole provided in the upper concave portion 5a of the case 5 through a through hole 8a provided in the connection bus bar 8 so as to sandwich the connection portions 7b of the pair of connection bus bars 7 arranged in proximity to each other. Bolts 9 are inserted into 5b, and bolts 9 are screwed into nuts (not shown) that are insert-molded into the case 5, so that the connecting portions 7b of the pair of connecting bus bars 7 are mechanically and electrically connected by the connecting bus bars 8. Are connected to each other.

  Further, when the bolts 9 are screwed together, the two convex portions 8b provided on the peripheral edge of the connecting bus bar 8 are configured to be fitted into the notches 7c provided on the connection bus bar 7, so that the rotation is prevented. Thus, the connecting bus bar 8 can be securely connected without causing a positional shift.

  The case mold type capacitor according to the present embodiment configured as described above has a configuration in which the connection bus bars 8 connected to the two second elements 2 are connected to each other by the connection bus bar 8. In the state before connecting the connection bus bars 7, the two second elements 2 are not electrically connected and are in an independent state. Therefore, the characteristics of the second element 2 are individually tested. In addition, after performing the characteristic inspection in this way, all connections can be made by simply connecting the connecting bus bars 7 with the connecting bus bar 8, so that it is possible to reduce the size with a simple configuration and to be excellent. This has the special effect of being able to guarantee high reliability.

  In the present embodiment, the connection bus bar 8 that connects the connection bus bars 7 connected to the two second elements 2 has been described as an example of a U-shape. However, the present invention is not limited to this, and any connection bus bar 7 may be used, and any shape such as an L shape or a flat plate shape may be used.

  The case mold type capacitor according to the present invention has an effect that each element can be individually inspected even when elements having different functions are connected in parallel and integrated, and is particularly useful in the field of hybrid vehicles and the like. is there.

The top view which showed the structure before the resin molding of the case mold type capacitor by one embodiment of this invention The top view which showed the composition after resin molding of the case mold type capacitor Circuit diagram showing the configuration of the same case mold type capacitor (A) The principal part top view which showed the structure before the connection of the connection part of the same case mold type capacitor, (b) The front view (A) The principal part top view which showed the structure after the connection of the connection part of the case mold type capacitor | condenser, (b) The front view Main part perspective view showing the configuration of the connection part of the same case mold type capacitor (A) The top view which showed the structure of the connection bus bar which comprises the connection part of the same case mold type capacitor, (b) The front view, (c) The side view, (d) The perspective view (A) The top view which showed the structure of the connection bus bar which comprises the connection part of the same case mold type capacitor, (b) The front view, (c) The side view, (d) The perspective view An exploded perspective view showing a configuration of a conventional case mold type capacitor Sectional drawing in the AA line of FIG. Circuit diagram showing the actual use condition of a conventional case mold type capacitor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st element 2 2nd element 3 P pole bus bar 3a, 4a Terminal part 4 N pole bus bar 5 Case 5a Upper side recessed part 5b Hole 5c Lower side recessed part 6 Mold resin 7 Connection bus bar 7a Soldering part 7b Connection part 7c Notch Part 8 Connection bus bar 8a Through hole 8b Convex part 9 Bolt

Claims (5)

Case mold in which first / second elements having different functions are connected in parallel by a bus bar having a terminal portion for external connection at one end, and these are housed in a case and at least the terminal portion of the bus bar is removed and resin-molded In the type capacitor, a connecting portion is provided in a portion excluding the mold resin filling portion of the case, and two second elements are connected in series between the bus bars via the connecting portion. The other ends of the pair of connected bus bars whose one ends are connected to the side not connected to the bus bar of the second element are arranged close to each other in a non-contact state, and the other ends of the pair of connected bus bars arranged close together are connected A case mold type capacitor that is mechanically and electrically connected by a bus bar. A connection bus bar that connects two second elements in series is provided with a soldering part that is soldered and connected to the second element at one end, and a tongue-like connecting part is provided at one end in the width direction at the other end. 2. The case mold according to claim 1, wherein the connection bus bar is connected to each of the two elements, and the tongue-shaped connecting portion is disposed close to the connecting portion so as to face each other in a non-contact state. Type capacitor. A connection bus bar for connecting two second elements in series by connecting the other ends of the connection bus bar is formed in a U-shape, and the other ends of the connection bus bar are sandwiched from above. The case mold type capacitor according to 1. The case mold according to claim 3, wherein a convex portion is provided on at least a part of a surface of the connecting bus bar that contacts the upper surface of the other end of the connecting bus bar, and a notch portion into which the convex portion is fitted is provided in the connecting bus bar. Capacitor. The case mold type capacitor according to claim 1, wherein the other end of the connection bus bar is mechanically and electrically connected by screwing the connection bus bar to the connection portion.

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