JP2005276946A - Capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve high-frequency characteristic of a capacitor that is housed in a box, having a structure for facilitating arrangement. <P>SOLUTION: Capacitor units 350 and 360 comprising the capacitor 305 are housed inside a box 320 and are connected in parallel with external terminals 341 and 342, respectively. A capacitor housing area 325 in the box 320 is equally divided into a plurality of regions, which are classified into regions where the capacitor units 350 are respectively arranged and regions where the capacitor units 360 are arranged together with the external terminals 341 and 342. The impedance in the high-frequency region of the capacitor unit 360 arranged adjacent to the external terminals 341 and 342 becomes lower than that in the high-frequency region of the capacitor units 350, so that the high-frequency characteristics of the capacitor 305 can be improved, as compared with a case when the capacitor 305 is comprised of identical capacitor units 350 only, without changing the shape of the box. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a capacitor device, and more particularly to a capacitor device housed in a housing.

  In various power supply apparatuses, a capacitor is generally used as a smoothing element that removes an AC component from a DC voltage. If the placement of the power supply device is severe, such as when it is mounted on a vehicle such as an automobile, the capacitor device should also be housed in a housing so that it can be placed in a limited space, and the desired electrical It is required to ensure the characteristics.

  As a capacitor device stored in such a casing, a configuration in which a plurality of wound foil electrode capacitor elements are stored in the same structure so as to be connected to the outside through a common terminal is disclosed. (For example, Patent Document 1).

Also, a configuration in which a plurality of capacitor assemblies are housed together with a metal heat sink in an exterior metal case and sealed (for example, Patent Document 2), and a capacitor array structure in which a plurality of capacitors having different capacities are joined together (for example, Patent Document) 3) Configuration of a capacitor assembly that can reduce high-frequency impedance as a whole by connecting the same pole terminals of a plurality of capacitors with metal conductors (for example, Patent Document 4), or a small-capacitance side capacitance and a large-capacitance side capacitance Is also disclosed about the configuration of a multilayer chip capacitor (for example, Patent Document 5) that can obtain good transfer characteristics over a wide frequency range.
JP 2002-50538 A Japanese Utility Model Publication No. 5-76028 JP-A-1-265508 JP 2000-286150 A JP 2000-243657 A

  A capacitor device used in a power supply device is required to have a low impedance in a high frequency region in order to remove a high frequency component, but sufficient high frequency characteristics are not always obtained due to the presence of a parasitic inductance or the like.

  In particular, in a capacitor device connected to a power converter composed of a power semiconductor switching element with high-speed switching operation, not only voltage fluctuation (ripple voltage) corresponding to the switching frequency, but also surge generated by the switching operation. Both voltages need to be removed. However, if the high frequency characteristics of the capacitor device are insufficient, there is a possibility that a higher frequency surge voltage cannot be sufficiently removed.

  Furthermore, in a capacitor device housed in a housing for placement in a limited space, it is necessary to improve high-frequency characteristics while ensuring mountability.

  The present invention has been made to solve such problems, and an object of the present invention is to improve the high frequency characteristics of a capacitor device housed in a housing so as to be easily arranged.

  A capacitor device according to the present invention is a capacitor device housed in a housing, and includes a terminal and a plurality of capacitor units. The terminal is provided to ensure electrical connection between the capacitor device and the outside of the housing. The plurality of capacitor units includes a first capacitor unit whose substantial impedance is minimal at the first frequency, and a second capacitor unit whose substantial impedance is minimal at a second frequency higher than the first frequency. A path including the capacitor unit and electrically connecting the electrode and the terminal of the second capacitor is shorter than a path electrically connecting the electrode and the terminal of the first capacitor.

  A capacitor device according to another configuration of the present invention is a capacitor device housed in a housing, and includes a terminal and a plurality of capacitor units. The terminal is provided to ensure electrical connection between the capacitor device and the outside of the housing. The plurality of capacitor units includes a first capacitor unit whose substantial impedance is minimal at the first frequency, and a second capacitor unit whose substantial impedance is minimal at a second frequency higher than the first frequency. The capacitor storage area is divided into a plurality of areas respectively corresponding to the plurality of capacitor units, and the plurality of areas include a plurality of first areas in which the first capacitor units are respectively disposed, Two capacitor units and at least one second region in which the terminals are arranged together.

  Preferably, each of the plurality of first regions has an equal area, and the area of the second region is equal to the area of each first region.

  Also preferably, the volume of the second capacitor unit is smaller than the volume of the first capacitor unit. Alternatively, the capacity of the second capacitor unit is smaller than the capacity of the first capacitor unit.

  Alternatively, preferably, the housing has a rectangular parallelepiped shape, and the bottom surface of the capacitor storage region has a rectangular shape.

  Preferably, the casing has a rectangular parallelepiped shape, and the outer periphery of the bottom surface of the capacitor storage area is configured by two groups of straight lines orthogonal to each other, and a fixing member of the capacitor device is attached to the outside of the capacitor storage area. Mounting holes are provided.

  In particular, the terminal is connected to a power converter composed of a semiconductor switching element. Alternatively, each of the plurality of capacitor units is composed of a film capacitor.

  In the capacitor device according to the present invention, there is a difference in the frequency of the minimum impedance point between a plurality of capacitor units connected in parallel. Therefore, compared to a capacitor device configured using only capacitor units having the same frequency characteristics. Further, a minimum impedance point exists in the high frequency region. Furthermore, since the parasitic inductance can be reduced in a capacitor unit with a short electrical connection path to the terminal, a higher frequency can be achieved by designing a relatively short electrical connection path between the capacitor and the terminal having good high frequency characteristics. High frequency characteristics can be improved up to the region.

  In the capacitor device according to another configuration of the present invention, there is a difference in the frequency of the minimum impedance point between the plurality of capacitor units connected in parallel. Therefore, the capacitor device configured using only the capacitor unit having the same frequency characteristic. As compared with the above, there are further impedance minimum points in the high frequency region. Furthermore, the capacitor storage area is divided into a plurality of areas respectively corresponding to a plurality of capacitor units, and the volume or capacity value of the capacitor unit arranged in accordance with the same area as the terminals is designed to be larger than other capacitor units. By utilizing the remaining space necessary for the terminal arrangement, it is possible to improve the high frequency characteristics of the capacitor device while ensuring the mounting efficiency without changing the housing shape.

  In particular, by setting the plurality of regions to the same area, the types of capacitor units can be suppressed and an efficient design can be achieved.

  In addition, the capacitor device according to the present invention can ensure mounting efficiency by making the casing into a rectangular parallelepiped shape suitable for a compact arrangement.

  Furthermore, the capacitor device according to the present invention can improve the installation workability by providing a mounting hole outside the capacitor storage area.

  Alternatively, in a configuration in which the capacitor device according to the present invention is connected to a power converter composed of a semiconductor switching element, the DC voltage fluctuations are eliminated by removing both ripple voltage and surge voltage in different frequency ranges by improving high frequency characteristics. Can be suppressed.

  In particular, the capacitor device according to the present invention has ensured mounting efficiency when applied to a structure in which a plurality of capacitor units are connected in parallel in a housing in order to secure a capacitance value using a film capacitor having excellent withstand voltage. The high frequency characteristics can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, about the same or equivalent part in a figure, the same code | symbol is attached | subjected and the description is not repeated.

  FIG. 1 is a schematic block diagram showing a configuration of a hybrid vehicle shown as an example of mounting a power supply device including a capacitor device according to the present invention.

Referring to FIG. 1, a hybrid vehicle 100 according to an embodiment of the present invention includes a battery 10, a PCU (Power Control Unit) 20, a power output device 30, a differential gear (DG) 40, a front wheel. 50L, 50R and rear wheels 60L, 60
R, front seats 70L and 70R, and a rear seat 80 are provided.

  The battery 10 is disposed at the rear portion of the rear seat 80. The battery 10 is electrically connected to the PCU 20. The PCU 20 is arranged using, for example, the lower area of the front seats 70L and 70R, that is, the lower floor area. The power output device 30 is disposed in the engine room in front of the dashboard 90. The PCU 20 is electrically connected to the power output device 30. The power output device 30 is connected to the DG 40.

  The battery 10 that is a DC power source is formed of, for example, a secondary battery such as nickel metal hydride or lithium ion, and supplies a DC voltage to the PCU 20 and is charged by the DC voltage from the PCU 20.

  PCU 20 boosts the DC voltage from battery 10, converts the boosted DC voltage into an AC voltage, and drives and controls the motor generator included in power output device 30. Further, the PCU 20 charges the battery 10 by converting the AC voltage generated by the motor generator included in the power output device 30 into a DC voltage.

  The power output device 30 transmits power from the engine and / or motor generator to the front wheels 50L and 50R via the DG 40 to drive the front wheels 50L and 50R. Further, the power output device 30 generates power by the rotational force of the front wheels 50L and 50R, and supplies the generated power to the PCU 20.

  The DG 40 transmits the power from the power output device 30 to the front wheels 50L and 50R, and transmits the rotational force of the front wheels 50L and 50R to the power output device 30.

  FIG. 2 is an electric circuit diagram showing a main part of the PCU 20 shown in FIG.

  Referring to FIG. 2, PCU 20 includes a converter 210 that is a step-up chopper, a smoothing capacitor 240, and an inverter 250. Converter 210 includes a reactor 220 and a step-up power module 230.

  Boosting power module 230 includes power semiconductor switching elements (hereinafter also simply referred to as “switching elements”) Q1 and Q2 and diodes D1 and D2. In this embodiment, an IGBT (Insulated Gate Bipolar Transistor) or a power MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is typically applied as the power semiconductor switching element.

  Switching elements Q1, Q2 are connected in series between power supply line 203 and earth line 202. Anti-parallel diodes D1 and D2 are connected to the switching elements Q1 and Q2, respectively, so that current flows from the emitter side to the collector side. Reactor 220 has one end connected to power supply line 201 and the other end connected to a connection point of switching elements Q1 and Q2. Smoothing capacitor 240 is connected between power supply line 203 and earth line 202.

  Inverter 250 includes U-phase arm 253, V-phase arm 254, and W-phase arm 255. U-phase arm 253, V-phase arm 254, and W-phase arm 255 are connected in parallel between power supply line 203 and ground line 202. U-phase arm 253 includes switching elements Q3 and Q4 connected in series, V-phase arm 254 includes switching elements Q5 and Q6 connected in series, and W-phase arm 255 includes switching elements connected in series. It consists of elements Q7 and Q8. Further, anti-parallel diodes D3 to D8 that flow current from the emitter side to the collector side are connected to the switching elements Q3 to Q8, respectively.

  An intermediate point of each phase arm is connected to each phase end of each phase coil of motor generator M1. That is, the motor generator M1 is a three-phase permanent magnet motor, and is configured by commonly connecting one end of three coils of U, V, and W phases to a midpoint. The other end of the U-phase coil is connected to the U-phase arm 253, the other end of the V-phase coil is connected to the midpoint of the V-phase arm 254, and the other end of the W-phase coil is connected to the W-phase arm 255.

  That is, converter 210 and inverter 250 correspond to a “power converter” configured by semiconductor switching elements.

  Converter 210 receives a DC voltage supplied from battery 10 between power supply line 201 and earth line 202, and boosts the DC voltage and outputs it to power supply line 203 by switching control of switching elements Q1 and Q2. .

  Smoothing capacitor 240 smoothes the DC voltage of power supply line 203 and supplies it to inverter 250. Inverter 250 converts the DC voltage of power supply line 203 into an AC voltage and drives motor generator M1.

  Inverter 250 converts the AC voltage generated by motor generator M1 into a DC voltage and supplies the same to smoothing capacitor 240. Smoothing capacitor 240 smoothes the DC voltage from motor generator M <b> 1 and supplies it to converter 210. Converter 210 steps down the DC voltage from smoothing capacitor 240 and supplies it to battery 10 or the like.

  As described above, the PCU 20 boosts the DC voltage from the battery 10 to drive the motor generator M1, and supplies the power generated by the motor generator M1 to the battery 10 and the like.

  Since the PCU 20 corresponding to the power supply device is disposed in a limited space below the floor, the smoothing capacitor 240 mounted on the PCU 20 is also required to have a compact outer shape. Therefore, the capacitor device according to this embodiment described below can be applied to the smoothing capacitor 240 constituting the PCU 20 of the hybrid vehicle 100.

  First, the actual frequency characteristics of the capacitor will be described with reference to FIGS.

  Referring to FIG. 3, the capacitor is ideally composed only of a capacitance component, but actually there is a parasitic inductance component due to a lead wire, an electrode, or the like. Therefore, the equivalent circuit 300 of the capacitor device is shown as an LC circuit in which the original capacitance component 310 and the parasitic inductance 315 are connected in series.

  As a result, as shown in FIG. 4, the impedance characteristic of the capacitor substantially has a frequency at which the impedance becomes minimum, that is, an impedance minimum point. For this reason, in the frequency region higher than the impedance minimum point, the impedance also increases as the frequency increases, so that the high frequency characteristics are deteriorated.

  The impedance characteristic of a capacitor changes according to its capacitance value. FIG. 4 illustrates impedance characteristic lines 311 to 314 corresponding to the capacitance values C0 to C3 (C0> C1> C2> C3), respectively.

  The frequencies f0 to f3 corresponding to the impedance minimum point correspond to the resonance frequency depending on the product of the capacitance values C0 to C3 and the parasitic reactance value. For example, when the parasitic inductance value of the capacitor having the capacitance value C0 is L, the corresponding resonance frequency f0 is expressed by the following equation (1).

2π · f0 = 1 / √ (L · C0) (1)
In general, as the capacitance value increases, the volume of the capacitor also increases, and accordingly, the parasitic inductance also increases accordingly. Therefore, as shown by the characteristic lines 311 to 314, the capacitor having a smaller capacitance value. The resonance frequency is also increased, and the high frequency characteristics are excellent.

  FIG. 5 is a conceptual diagram showing a configuration of a capacitor device shown as a comparative example of the capacitor device according to the present invention.

  Referring to FIG. 5, a capacitor device 301 shown as a comparative example is composed of a plurality of capacitor units 330 connected in parallel to each other. The plurality of capacitor units 330 have the same specifications, that is, the same capacity value and the same size (volume and shape), and are arranged so as to equally divide the capacitor storage area 325 in the housing 320.

  With respect to these capacitor units 330 connected in parallel, it is possible to ensure electrical connection with the outside of the housing 320 by the external terminals 341 and 342.

  In particular, a film capacitor having an excellent withstand voltage may be used for a capacitor device applied to a hybrid vehicle. In this case, in order to secure a large capacity using a film capacitor, a structure in which a plurality of capacitor units are connected in parallel as shown in FIG. 5 is efficient from the viewpoint of miniaturization of the capacitor device.

  Since the capacitor device 301 shown as a comparative example is configured by connecting a plurality of capacitor units 330 having the same specifications in parallel, the impedance characteristic thereof is a single impedance minimum point (frequency fa) as shown in FIG. Have For this reason, the influence of an inductance component becomes large in a high frequency region, and a high frequency voltage such as a surge voltage cannot be sufficiently removed.

  Next, the structure of the capacitor device according to the embodiment of the present invention will be described in detail.

  FIG. 7 is a view for explaining the outer shape of the capacitor device according to the present invention. 7A is a view of the capacitor device 305 according to the present invention as viewed from above, and FIG. 7B is a view of the capacitor device 305 as viewed from the X direction of FIG. 7A. (C) is the figure which looked at the capacitor | condenser apparatus 305 from the Y direction of Fig.7 (a).

  7A, 7B, and 7C, in capacitor device 305 according to the present invention, casing 320 is provided in a rectangular parallelepiped shape, and the bottom surface of capacitor storage area 325 inside casing 320 is rectangular. Has a shape. Further, the capacitor storage area 325 is divided into a plurality of areas, and the plurality of areas are an area 326 corresponding to a “first area” in which the capacitor unit is disposed but the external terminals 341 and 342 are not disposed, The region is classified into a region 328 corresponding to a “second region” in which the external terminals 341 and 342 and the capacitor unit are arranged together.

  FIG. 8 is a diagram illustrating the configuration of the capacitor device 305 according to the present invention.

  Referring to FIG. 8, in capacitor device 305 according to the present invention, capacitor unit 350 corresponding to “first capacitor unit” is arranged in each of regions 326 shown in FIG. Capacitor units 360 corresponding to 341 and 342 and “second capacitor unit” are arranged.

  With such an arrangement, the path 361 that electrically connects the electrode of the capacitor unit 360 and the external terminals 341 and 342 is electrically connected between the electrode of the capacitor unit 350 and the external terminals 341 and 342. Naturally shorter than the path 351 connected to the.

  As described with reference to FIG. 7A, since the external terminals 341 and 342 are arranged together in the region 328, the arrangement space of the capacitor unit 360 is reduced. For this reason, the volume and capacity of the capacitor unit 360 are smaller than those of the capacitor unit 350 arranged in the region 326. On the other hand, if the areas 326 have the same area, by making the capacitor units 350 to have the same specifications, it is possible to reduce the types of capacitor units required and achieve an efficient design.

  FIG. 9 is an electrical equivalent circuit diagram of the capacitor device according to the present invention.

  Referring to FIG. 9, capacitor device 305 according to the present invention includes capacitor units 350 and 360 connected in parallel between external terminals 341 and 342. In FIG. 9, the capacitance value of the capacitor unit 350 is C0, the parasitic inductance value is L0, the capacitance value of the capacitor unit 360 is C2 (C2 <C0), and the parasitic inductance value is L2 (L2 <L0). From the electric circuit shown in FIG. 9, the impedance characteristic of the capacitor device 301 is as shown in FIG.

  Referring to FIG. 10, when capacitor unit 350 has the same impedance characteristic as capacitor unit 330 constituting capacitor device 301 shown as the comparative example, capacitor unit 330 has a resonance frequency corresponding to C0 and L0. It has an impedance minimum point at fa.

  The resonance frequency fb of the capacitor unit 360 is higher than the resonance frequency fa because C2 and L2 are smaller than C0 and L0, respectively. Therefore, the capacitor device 305 has a minimum impedance in the high frequency region corresponding to the resonance frequency fb of the capacitor unit 360 (C2, L2) in addition to the same minimum impedance point (frequency fa) as that of the capacitor device 301 shown as the comparative example. It has further points.

  In particular, as the capacitor unit is arranged closer to the external terminals 341 and 342, the connection distance between the external terminal and the capacitor becomes shorter, so that the parasitic inductance value can be suppressed and the impedance in the high frequency region can be easily lowered. Therefore, like the capacitor device 305, a path 361 that electrically connects the electrode of the capacitor unit 360 having a relatively high impedance minimum point frequency and the external terminals 341 and 342 is provided in the other capacitor unit. By adopting a configuration that is relatively shorter than the path, the effect of reducing the impedance in the high frequency region in the entire capacitor device 305, that is, the effect of improving the high frequency characteristics is increased.

  Therefore, the capacitor device 301 according to the present invention can improve high frequency characteristics and more reliably remove high frequency voltage such as surge voltage. Moreover, desired impedance characteristics can be realized by selecting the capacitor units 350 and 360. For example, if the frequency fa corresponds to the switching frequency of the boost converter 210 or the inverter 250 shown in FIG. 2, the AC voltage fluctuation (ripple voltage) on the power supply line 203 can be removed. Furthermore, if the frequency fb in the high frequency region is made to correspond to the frequency of the surge voltage in consideration of the switching frequency, both the ripple voltage and the surge voltage having different frequency regions are removed, and the fluctuation of the DC voltage on the power supply line 203 is reduced. Can be suppressed.

  Furthermore, the capacitor unit 360 for improving such high frequency characteristics can be efficiently arranged without changing the outer shape of the housing 320 by using the remaining space where the external terminals 341 and 342 are provided. it can. That is, in order to arrange the capacitor unit for improving the high frequency characteristics, it is not necessary to change the rectangular parallelepiped shape of the housing 320 suitable for the compact arrangement, and the mounting efficiency can be ensured.

  FIG. 11 shows another example of the structure of the capacitor device according to the present invention.

  FIG. 11A is a view of a capacitor device 305 # of another structural example according to the present invention as viewed from above, and FIG. 11B is a view of the capacitor device 305 # as viewed from the X direction of FIG. 11A. FIG. 11C shows the capacitor device 305 # as viewed from the Y direction of FIG. 11A.

  Referring to FIG. 11A, in capacitor device 305 #, fixing attachment holes 345 are provided at the four corners of housing 320. Referring to FIG. Capacitor storage region 325 # has a shape such that its outer periphery is formed by a group of straight lines in two directions orthogonal to each other so as to avoid mounting hole 345. Capacitor storage area 325 # includes a plurality of areas 326 # and 329 # corresponding to the “first area” for arranging the capacitor unit, and the “first” for arranging capacitor unit and external terminals 341 and 342 together. And a region 328 # corresponding to “region 2”.

  As shown in FIGS. 11B and 11C, in the region corresponding to the attachment hole 345, the side surface of the housing 320 is hollow in order to arrange a fixing member (not shown).

  Referring to FIG. 12, capacitor unit 350 # having the same specifications is arranged corresponding to each region 326 # shown in FIG. 11, and capacitor unit 360 # is arranged in region 328 # together with external terminals 341 and 342. Is done.

  Similarly, in capacitor device 305 #, path 361 # that electrically connects between the electrode of capacitor unit 360 # having a relatively high frequency at the minimum impedance point and external terminals 341 and 342 is connected to other capacitor unit 350. It can be naturally shorter than the path 351 # that electrically connects between the electrode and the external terminals 341 and 342. Therefore, the effect of improving the high, that is, high-frequency characteristics of capacitor device 305 # as a whole is increased.

  Capacitor unit 355 # is further arranged in region 329 # between mounting holes 345. For region 329 #, capacitor unit 350 # similar to region 326 # may be disposed with the same volume (bottom area) as region 326 #.

  By adopting such a configuration, as shown in FIG. 13, the impedance characteristic of capacitor device 305 # is also limited to the impedance minimum point (resonance frequency fc) corresponding to capacitor unit 350 # as in capacitor device 305. First, there is a minimum impedance point (resonance frequency fd) corresponding to capacitor unit 360 #.

  Thereby, like the capacitor device 305, high frequency characteristics can be improved, both ripple voltage and surge voltage in different frequency ranges can be removed, and fluctuations in the DC voltage on the power supply line 203 can be suppressed.

  Furthermore, in capacitor device 305 #, mounting holes 345 are provided at the four corners of casing 320 to improve the installation workability, and the outer shape of casing 320 can be maintained in a rectangular parallelepiped shape, so that mounting efficiency can be ensured. Is possible.

  In the above embodiment, the configuration example in which the capacitor device according to the present invention is applied to the smoothing capacitor of the inverter input voltage in the power supply unit (PCU) of the hybrid vehicle has been described. However, the application of the present invention is not limited to such a case, and it is widely applied to the purpose of improving the high frequency characteristics while maintaining the mounting efficiency of the capacitor devices mounted on various power supply devices. be able to.

  In particular, the use of the capacitor device according to the present invention is suitable for a structure in which a plurality of capacitor units are connected in parallel in a housing in order to secure a capacitance value using a film capacitor having an excellent breakdown voltage.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 is a schematic block diagram showing a configuration of a hybrid vehicle shown as an example of mounting a power supply device including a capacitor device according to the present invention. It is an electric circuit diagram which shows the principal part of the power supply unit (PCU) shown by FIG. It is a general equivalent circuit diagram of a capacitor device. It is a figure which shows the impedance characteristic of the equivalent circuit shown by FIG. It is a conceptual diagram which shows the comparative example of the capacitor | condenser apparatus stored in the housing | casing. It is a figure which shows the impedance characteristic of the capacitor | condenser apparatus shown by FIG. It is a figure explaining the external shape of the capacitor | condenser apparatus by this invention. It is a figure explaining the structure of the capacitor | condenser apparatus by this invention. It is an electrical equivalent circuit diagram of the capacitor | condenser apparatus by this invention. It is a figure which shows the impedance characteristic of the capacitor | condenser apparatus by this invention. It is a figure explaining the external shape of the capacitor | condenser apparatus of the other structural example by this invention. It is a figure explaining the structure of the capacitor | condenser apparatus shown in FIG. It is a figure which shows the impedance characteristic of the capacitor | condenser apparatus shown in FIG.

Explanation of symbols

  10 battery, 20 PCU (power supply unit), 100 hybrid vehicle, 201, 203 power line, 202 ground line, 240 smoothing capacitor, 250 inverter, 301, 305, 305 # capacitor unit, 315 inductance component (parasitic inductance), 300 equivalent Circuit (capacitor device), 311 to 314 impedance characteristic line, 320 housing, 325 capacitor storage area, 326, 326 #, 328, 328 #, 329 # area, 330, 350, 360, 350 #, 355 #, 360 # Capacitor unit, 341, 342 External terminal, 345 Mounting hole, fa, fb, fc, fd Frequency (impedance minimum point), M1 motor generator, Q1-Q8 semiconductor switching element.

Claims (9)

A capacitor device housed in a housing,
A terminal provided to ensure electrical connection between the capacitor device and the outside of the housing;
A plurality of capacitor units arranged in a capacitor storage area inside the housing and connected in parallel to the terminals;
The plurality of capacitor units are:
A first capacitor unit whose substantial impedance is minimal at the first frequency;
A second capacitor unit having a substantial impedance minimum at a second frequency higher than the first frequency;
The capacitor | condenser apparatus with which the path | route which electrically connects between the electrode of the said 2nd capacitor | condenser and the said terminal is shorter than the path | route which electrically connects between the electrode of the said 1st capacitor | condenser and the said terminal. A capacitor device housed in a housing,
A terminal provided to ensure electrical connection between the capacitor device and the outside of the housing;
A plurality of capacitor units arranged in a capacitor storage area inside the housing and connected in parallel to the terminals;
The plurality of capacitor units are:
A first capacitor unit whose substantial impedance is minimal at the first frequency;
A second capacitor unit having a substantial impedance minimum at a second frequency higher than the first frequency;
The capacitor storage area is divided into a plurality of areas respectively corresponding to the plurality of capacitor units,
The plurality of regions are:
A plurality of first regions in which the first capacitor units are respectively disposed;
A capacitor device comprising: the second capacitor unit and at least one second region in which the terminals are arranged together. Each said first region is of equal area,
The capacitor device according to claim 2, wherein an area of the second region is equal to an area of each of the first regions.   The capacitor device according to claim 1, wherein a volume of the second capacitor unit is smaller than a volume of the first capacitor unit.   The capacitor device according to claim 1, wherein a capacity of the second capacitor unit is smaller than a capacity of the first capacitor unit. The housing has a rectangular parallelepiped shape,
The capacitor device according to claim 1, wherein a bottom surface of the capacitor storage region has a rectangular shape. The housing has a rectangular parallelepiped shape,
The outer periphery of the bottom surface of the capacitor storage region is constituted by a group of straight lines in two directions orthogonal to each other.
The capacitor device according to claim 1, wherein a mounting hole for mounting a fixing member of the capacitor device is provided outside the capacitor storage region.   The capacitor device according to claim 1, wherein the terminal is connected to a power converter composed of a semiconductor switching element.   9. The capacitor device according to claim 1, wherein each of the plurality of capacitor units includes a film capacitor.

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