JP2016059120A - Capacitor module and power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an inductance of a conductor to be a current path.SOLUTION: A capacitor module 100 includes a PN bus bar portion 110 in which a P bus bar and an N bus bar are laminated and capacitors 101 and 102 are mounted on a capacitor mounting area on the PN bus bar portion 110. The capacitor mounting area in the P bus bar and the N bus bar is a main current path of current from a power source. The PN bus bar portion 110 includes: a P electrode pattern layer 113 which is formed between the capacitors 101 and 102 and the P bus bar and N bus bar, and is electrically connected to a capacitor terminal of the capacitors 101 and 102 and electrically connected to the P bus bar outside the capacitor mounting area; and N electrode pattern layers 111 and 112 which are formed between the capacitors 101 and 102 and the P bus bar and N bus bar, and electrically connected to the capacitor terminal of the capacitors 101 and 102 and electrically connected to the N bus bar outside the capacitor mounting area.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a capacitor module and a power unit.

  Conventionally, an in-vehicle inverter device such as an electric vehicle is known. The inverter device includes a switching module and a capacitor.

  Further, as a module on which a capacitor for an inverter device is mounted, a through-hole is formed, and a substrate provided with a first conductor and a second conductor on the upper surface and the lower surface, respectively, and a plurality of devices mounted on the upper surface of the substrate A capacitor module including a multilayer capacitor is known (see Patent Document 1). The multilayer capacitor has a first lead terminal and a second lead terminal. The multilayer capacitor is fixed to the substrate by soldering the first and second lead terminals to the lower surface of the substrate through the through hole of the substrate. By the soldering, the first lead terminal is electrically connected to the first conductor, and the second lead terminal is electrically connected to the second conductor.

  Since the first conductor and the second conductor are formed so as to show almost the entire area of the upper surface and the lower surface of the substrate, current flows in various directions in the first conductor and the second conductor, The generation of inductance at the electrical connection between the switching module and the multilayer capacitor is suppressed.

JP 2001-178151 A

  However, in the conventional capacitor module, a through hole is arranged in the capacitor mounting region, and the first lead terminal and the second conductor are not short-circuited at the peripheral portion of the through hole through which the first lead terminal passes. A cutout portion of the first conductor is formed, and a cutout portion of the first conductor is formed at the peripheral portion of the through hole through which the second lead terminal passes. For this reason, since the current path is limited and narrowed by the cutout portions of the first conductor and the second conductor, the inductance of the first conductor and the second conductor serving as the current path is increased by this part. Was.

  The subject of this invention is reducing the inductance of the conductor used as an electric current path.

In order to solve the above-mentioned problem, the invention described in claim 1
A capacitor module having a PN bus bar portion in which a P bus bar and an N bus bar electrically connected to a power module base unit and a power source are stacked, and a plurality of capacitors mounted in a capacitor mounting region on the PN bus bar portion. And
The capacitor mounting area in the P bus bar and the N bus bar is a main current path of a current from the power source,
The PN bus bar is
A P electrode pattern layer formed between the capacitor and the P bus bar and the N bus bar, electrically connected to a capacitor terminal of the capacitor, and electrically connected to the P bus bar outside the capacitor mounting region; ,
An N electrode pattern layer formed between the capacitor and the P bus bar and the N bus bar, electrically connected to a capacitor terminal of the capacitor, and electrically connected to the N bus bar outside the capacitor mounting region; ,
It is characterized by providing.

The invention according to claim 2 is the capacitor module according to claim 1,
The P bus bar and the N bus bar are formed in an annular shape,
A first common terminal that electrically connects the P electrode pattern layer, the P electrode of the circuit unit of the base unit, and the P bus bar unit, the N electrode pattern layer, and the circuit unit of the base unit And a second common terminal that electrically connects the three N electrodes and the N bus bar to each other are arranged on the outer peripheral side or inner peripheral side of the ring of the P bus bar and the N bus bar. And

The invention according to claim 3 is the capacitor module according to claim 1 or 2,
The first and second common terminals are a P terminal and an N terminal of the base unit.

The invention according to claim 4 is the capacitor module according to claim 2 or 3,
The plurality of capacitors are arranged at substantially equal intervals on the annular P bus bar and N bus bar.

The invention according to claim 5 is the capacitor module according to any one of claims 2 to 4,
The signal terminal of the circuit unit of the base unit is disposed on the inner peripheral side or the outer peripheral side of the P bus bar and the N bus bar,
The capacitor mounting region is disposed between the signal terminal and the first and second common terminals.

The power unit of the invention according to claim 6 is:
The capacitor module according to any one of claims 1 to 5,
And a base unit.

  According to the present invention, it is possible to reduce the inductance of the P bus bar and the N bus bar as conductors serving as current paths.

It is a perspective view of the power module of an embodiment of the invention. (A) is sectional drawing of the base unit and PN bus bar part in the P-side through-hole. (B) is sectional drawing of the base unit and PN bus bar part in the N side through-hole. It is a plane perspective view of a power module. It is a plane perspective schematic diagram of a power unit.

  Embodiments according to the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the illustrated example.

  With reference to FIGS. 1-4, the apparatus structure of this Embodiment is demonstrated. FIG. 1 is a perspective view of a power module 1 according to the present embodiment. FIG. 2A is a cross-sectional view of the base unit 200 and the PN bus bar portion 110 in the P-side through hole 116. FIG. 2B is a cross-sectional view of the base unit 200 and the PN bus bar portion 110 in the through hole 115 on the N side. FIG. 3 is a plan perspective view of the power module 1.

  The power module 1 according to the present embodiment is an in-vehicle power module such as an electric vehicle and includes an inverter device that converts direct current into alternating current. However, the power module 1 may be a power module for other uses.

  As shown in FIG. 1, the power module 1 includes a capacitor module 100 and a base unit 200. The base unit 200 includes a circuit unit (not shown) as a component of the inverter device. The circuit unit of the inverter device includes circuit elements including IGBTs (Insulated Gate Bipolar Transistors), FWDs (Free Wheeling Diodes), and the like as switching elements.

  The base unit 200 includes a base plate 201, N (negative) terminals 202 and 203, a P (positive) terminal 204, AC (Alternating Current) terminals 205 and 206, a signal terminal 207, and positioning units 208, 209, and 210. (Not shown in FIG. 1).

  The base plate 201 is a plate serving as a base of the power module 1 and has a shape whose plane is substantially trapezoidal. The circuit unit of the inverter device is mounted on the base plate 201. The N terminals 202 and 203 are terminals on the N pole side from which a DC N electrode (N layer of IGBT) electrically connected to the circuit unit of the inverter device is drawn out. The P terminal 204 is a terminal on the P pole side from which a DC P electrode (P layer of IGBT) electrically connected to the circuit unit of the inverter device is drawn. AC terminals 205 and 206 are AC terminals electrically connected to the circuit unit of the inverter device. The signal terminal 207 is an input terminal for a switching control signal of the switching element of the circuit unit of the inverter device.

  The N terminals 202 and 203, the P terminal 204, the AC terminals 205 and 206, and the signal terminal 207 are conductor terminals protruding from the base plate 201 in the vertical direction. The N terminals 202 and 203 have a substantially plate shape and are processed into a single rod shape with the tip side extending in the vertical direction. The P terminal 204 has a substantially plate shape, and is processed into three rod shapes whose front ends extend in the vertical direction. The AC terminals 205 and 206 are plate-shaped. The signal terminal 207 has a plurality of rod shapes whose front ends extend in the vertical direction.

  The capacitor module 100 is mounted on the base unit 200. The capacitor module 100 includes capacitors 101 and 102 and a PN bus bar unit 110.

  Capacitors 101 and 102 are made of ceramic capacitors or the like, and are smoothing capacitors that smooth the current between N terminals 202 and 203 and P terminal 204. The capacitors 101 and 102 are mounted in a predetermined capacitor mounting area on the PN bus bar unit 110. Capacitors 101 and 102 have capacitor terminals.

  The PN bus bar unit 110 is a substrate having a circular plane, and is a component common to other power modules 1. In FIG. 1, a substantially fan-shaped PN bus bar portion 110 corresponding to one power module 1 is illustrated. The PN bus bar unit 110 includes an insulating layer 121. The insulating layer 121 is a layer made of an insulator such as glass epoxy resin.

  The PN bus bar portion 110 includes N electrode pattern layers 111 and 112 and a P electrode pattern layer 113 on the upper surface, and through holes 114, 115, 116, and 117 are formed. The N electrode pattern layer 111 is made of a conductor such as copper foil, and is electrically connected to the N terminal 202 and the capacitor terminal of the capacitor 101. The N electrode pattern layer 112 is made of a conductor such as copper foil, and is electrically connected to the N terminal 203 and the capacitor terminal of the capacitor 102. The P electrode pattern layer 113 is made of a conductor such as copper foil and is electrically connected to the P terminal 204 and the capacitor terminals of the capacitors 101 and 102. The through holes 114, 115, 116, and 117 are through holes through which the N terminals 202 and 203, the P terminal 204, and the signal terminal 207 are passed, respectively. The AC terminals 205 and 206 are passed through the notch portion of the PN bus bar portion 110.

  As shown in FIG. 2A, in the cross section of the PN bus bar portion 110 in the through hole 116, the PN bus bar portion 110 has an insulating layer 121, an N bus bar 122, and an insulating layer 121 from the base plate 201 side to the capacitors 101 and 102 side. The P bus bar 123 and the insulating layer 121 are sequentially laminated, and the P electrode pattern layer 113 is further laminated. The N bus bar 122 is a plate-like conductor such as a copper plate, and is electrically connected to a cathode of a power source (not shown). The P bus bar 123 is a plate-like conductor such as a copper plate and is electrically connected to an anode of a power source (not shown).

  The through hole 116 has a conductor 116a on the inner wall of the hole. The conductor 116a is electrically connected to the P bus bar 123 and the P electrode pattern layer 113, and is in contact with and electrically connected to the P terminal 204 by passing through the P terminal 204. In this way, the P bus bar 123, the P electrode pattern layer 113, and the P terminal 204 are electrically connected to each other through the through hole 116.

  As shown in FIG. 2B, the N bus bar 122, the N electrode pattern layer 112, and the N terminal 203 are electrically connected to each other through the conductor 115 a of the through hole 115. Similarly, the N bus bar 122, the N electrode pattern layer 111, and the N terminal 202 are electrically connected to each other through the conductor of the through hole 114. As described above, the N electrode pattern layers 111 and 112 and the P electrode pattern layer 113 are formed between the capacitors 101 and 102 and the P bus bar 123 and the N bus bar 122.

  As shown in FIG. 3, the PN bus bar unit 110 is disposed on the base unit 200. The capacitor 101 is disposed in a capacitor mounting region that partially overlaps the N electrode pattern layer 111 and the P electrode pattern layer 113 of the PN bus bar portion 110 on a plane. The capacitor 102 is disposed in a capacitor mounting region that partially overlaps the N electrode pattern layer 112 and the P electrode pattern layer 113 of the PN bus bar portion 110 on a plane.

  Capacitors 101 and 102 are arranged in a capacitor mounting region in the region of N bus bar 122 and P bus bar 123 of PN bus bar unit 110 on a plane. A region corresponding to the capacitor mounting region in the N bus bar 122 and the P bus bar 123 flows between the power source (not shown) and the P terminal 204 and the N terminals 202 and 203 (capacitors 101 and 102, the circuit portion of the base unit 200). It becomes the main current path of the current. However, no through hole is arranged in the PN bus bar portion 110 corresponding to the capacitor mounting area of the capacitors 101 and 102. Therefore, it is not necessary to form notches in the N bus bar 122 and the P bus bar 123 corresponding to the capacitor mounting area of the capacitors 101 and 102.

  Next, a power unit 2 composed of a plurality of power modules 1 will be described with reference to FIG. FIG. 4 is a schematic plan view of the power unit 2.

  As shown in FIG. 4, the power unit 2 has five power modules 1 and is formed in a circular shape on a plane. The solid line in FIG. 4 indicates the capacitor module 100, and the dotted line similarly indicates the base unit 200. With the arrangement of the power module 1 in the power unit 2, the N bus bar 122 and the P bus bar 123 of the PN bus bar unit 110 are also arranged in a substantially annular shape.

  With these arrangements, the N terminals 202 and 203 and the P terminal 204 are arranged on the outer peripheral side of the ring of the N bus bar 122 and the P bus bar 123. The signal terminal 207 is arranged on the inner peripheral side of the ring of the N bus bar 122 and the P bus bar 123. Further, all the ten capacitors 101 and 102 in the five power modules 1 are arranged at substantially equal intervals on the ring of the N bus bar 122 and the P bus bar 123. In addition, the five base units 200 are mounted on a disk-shaped cooler (heat sink) (not shown) having the same size as the PN bus bar unit 110, for example.

  As described above, according to the present embodiment, capacitor module 100 includes PN bus bar unit 110, and capacitors 101 and 102 are mounted in the capacitor mounting region on PN bus bar unit 110. The capacitor mounting area in the P bus bar 123 and the N bus bar 122 is a main current path of current from the power source. The PN bus bar unit 110 is formed between the capacitors 101 and 102 and the P bus bar 123 and the N bus bar 122, is electrically connected to the capacitor terminals of the capacitors 101 and 102, and is electrically connected to the P bus bar 123 outside the capacitor mounting area. Is formed between the P electrode pattern layer 113, the capacitors 101 and 102, the P bus bar 123 and the N bus bar 122, and is electrically connected to the capacitor terminals of the capacitors 101 and 102. N electrode pattern layers 111 and 112 electrically connected to the bus bar 122.

  Therefore, the capacitors 101 and 102 and the P bus bar 123 and the N bus bar 122 are electrically connected to each other without forming a through hole that narrows the current path in the capacitor mounting region that is the main current path of the P bus bar 123 and the N bus bar 122. Since the connection is made, the inductance of the P bus bar 123 and the N bus bar 122 serving as the main current path can be reduced. The capacitor module 100 can reduce the inductance by about 22% compared to the conventional configuration.

  In addition, the P bus bar 123 and the N bus bar 122 are formed in an annular shape, and electrically connect the P electrode pattern layer 113, the P electrode of the circuit unit of the base unit 200, and the P bus bar 123 to each other. The common terminal and the second common terminal that electrically connects the N electrode pattern layers 111 and 112 and the N electrode of the circuit unit of the base unit 200 and the N bus bar 122 to each other are the P bus bar 123 and the N bus bar. It is arranged on the outer peripheral side of the 122 annular ring. For this reason, the circuit part of the base unit 200 of the power module 1, the capacitors 101 and 102, the P bus bar 123, and the N bus bar 122 can be electrically connected with low inductance.

  The first and second common terminals are the P terminal 204 and the N terminals 202 and 203 of the base unit 200. For this reason, a low inductance is realized by directly electrically connecting the circuit unit of the base unit 200 to the capacitors 101 and 102, the P bus bar 123, and the N bus bar 122 by the P terminal 204 and the N terminals 202 and 203. it can.

  The capacitors 101 and 102 are arranged on the annular P bus bar 123 and the N bus bar 122 at substantially equal intervals. For this reason, the inductance between capacitors can be made uniform.

  The signal terminal 207 of the circuit unit of the base unit 200 is disposed on the inner peripheral side of the ring of the P bus bar 123 and the N bus bar 122, and the capacitor mounting area includes the signal terminal 207, the P terminal 204, and the N terminals 202 and 203. Between. For this reason, electrical connection can be facilitated.

  The description in the above embodiment is an example of a suitable capacitor module and power module according to the present invention, and the present invention is not limited to this.

  For example, in the above embodiment, two capacitors are mounted on the PN bus bar unit 110 of one power module 1, but the present invention is not limited to this. It is good also as a structure which mounts three or more capacitors in the PN bus bar part of one power module. Furthermore, these three or more capacitors are preferably arranged at substantially equal intervals on the annular P bus bar and N bus bar.

  In the above embodiment, the P terminal 204 and the N terminals 202 and 203 are arranged on the outer peripheral side of the ring of the P bus bar 123 and the N bus bar 122, and the signal terminal 207 is also arranged on the inner peripheral side. However, the present invention is not limited to this. The P terminal 204 and the N terminals 202 and 203 may be arranged on the inner peripheral side of the ring of the P bus bar 123 and the N bus bar 122, and the signal terminal 207 may be arranged on the outer peripheral side.

  Moreover, in the said embodiment, although the power unit 2 was set as the structure provided with the five power modules 1, it is not limited to this, It is good also as numbers other than five. Moreover, in the said embodiment, although the power module 1 was set as the structure provided with the two capacitors 101 and 102, it is not limited to this, It is good also as numbers other than two.

  Further, the detailed configuration and detailed operation of each part constituting the power unit 2 in the above embodiment can be appropriately changed without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Power module 2 Power unit 100 Capacitor module 101,102 Capacitor 110 PN bus bar part 121 Insulating layer 122 N bus bar 123 P bus bar 111, 112 N electrode pattern layer 113 P electrode pattern layer 114, 115, 116, 117 Through-hole 115a, 116a Conductivity Body 200 Base unit 201 Base plate 202, 203 N terminal 204 P terminal 205, 206 AC terminal 207 Signal terminal 208, 209, 210 Positioning part

Claims (6)

A capacitor module having a PN bus bar portion in which a P bus bar and an N bus bar electrically connected to a power module base unit and a power source are stacked, and a plurality of capacitors mounted in a capacitor mounting region on the PN bus bar portion. And
The capacitor mounting area in the P bus bar and the N bus bar is a main current path of a current from the power source,
The PN bus bar is
A P electrode pattern layer formed between the capacitor and the P bus bar and the N bus bar, electrically connected to a capacitor terminal of the capacitor, and electrically connected to the P bus bar outside the capacitor mounting region; ,
An N electrode pattern layer formed between the capacitor and the P bus bar and the N bus bar, electrically connected to a capacitor terminal of the capacitor, and electrically connected to the N bus bar outside the capacitor mounting region; ,
A capacitor module comprising: The P bus bar and the N bus bar are formed in an annular shape,
A first common terminal that electrically connects the P electrode pattern layer, the P electrode of the circuit unit of the base unit, and the P bus bar unit, the N electrode pattern layer, and the circuit unit of the base unit And a second common terminal that electrically connects the three N electrodes and the N bus bar to each other are arranged on the outer peripheral side or inner peripheral side of the ring of the P bus bar and the N bus bar. The capacitor module according to claim 1.   The capacitor module according to claim 1, wherein the first and second common terminals are a P terminal and an N terminal of the base unit.   4. The capacitor module according to claim 2, wherein the plurality of capacitors are arranged at substantially equal intervals on the annular P bus bar and the N bus bar. 5. The signal terminal of the circuit unit of the base unit is disposed on the inner peripheral side or the outer peripheral side of the P bus bar and the N bus bar,
5. The capacitor module according to claim 2, wherein the capacitor mounting region is disposed between the signal terminal and the first and second common terminals. 6. The capacitor module according to any one of claims 1 to 5,
A power unit comprising: the base unit.

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