JP2013027284A - Power conversion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power conversion device that allows improvement of installation workability in installing components in an intermediate bus-bar.SOLUTION: A power conversion device 1 comprises: a switching circuit unit 51; a high-voltage circuit unit 53; a low-voltage circuit unit 58; a case 6; an input connector 3; an intermediate bus-bar assembly 10; and a voltage detection wire assembly 4. The input connector 3 is disposed closer to the low-voltage circuit unit 58 side rather than to the center of the switching circuit unit 51 in the stacking direction Z. Further, an intermediate bus-bar 2 electrically connects a connector terminal 31 of the input connector 3 and an input terminal 532 of the high-voltage circuit unit 53. The intermediate bus-bar 2 is disposed so as to be upright in the stacking direction Z and has a first terminal 21 and a second terminal 26. The intermediate bus-bar assembly 10 has an assembly fixing part 12, a first terminal block part 13, and a second terminal block part 16. A voltage detection line 41 is connected to the first terminal 21 on the first terminal block part 13.

Description

  The present invention relates to a power conversion device including a switching circuit unit, a low voltage circuit unit, and a high voltage circuit unit.

  For example, a power conversion device disclosed in Patent Document 1 is known as a power conversion device that performs power conversion between DC power and AC power. As shown in FIG. 9, the power conversion device 9 includes a switching circuit unit 91, a capacitor 92, and a control circuit board 93 formed by stacking a plurality of semiconductor modules 911 and cooling units 912 housed inside a case 98. Etc., and a power conversion unit 90 composed of the like. The capacitor 92 is electrically connected to the main electrode terminal of the semiconductor module 911 via the power bus bar 94, and forms a part of the high-voltage circuit portion 901 through which a non-control current that is a high-voltage current flows. The control circuit board 93 is connected to the control terminal of the semiconductor module 911 and forms a part of the low-voltage circuit portion 902 through which a control current that is a low-voltage current flows. As shown in the figure, the high voltage circuit unit 901 is disposed below the switching circuit unit 91, and the low voltage circuit unit 902 is disposed above the switching circuit unit 91.

  The power converter 9 includes an input connector 95 that inputs high-voltage power supplied from a battery (not shown), and a pair of intermediate bus bars 96 that electrically connect the input connector 95 and the input terminal 921 of the capacitor 92. And have. The intermediate bus bar 96 is arranged along the direction (vertical direction) in which the switching circuit unit 91, the high voltage circuit unit 901, and the low voltage circuit unit 902 are arranged, and is fixed to the input terminal 921 of the capacitor 92 using bolts and nuts. And electrically connected. The intermediate bus bar 96 is fixedly held by the input connector 95.

  In the power conversion device 9, in order to improve the control accuracy of the power conversion circuit, the voltage of the non-control current input to the power conversion circuit may be detected. In such a case, a pair of voltage detection lines 97 for detecting the input voltage is provided, and a part of the high voltage circuit unit 901 and the voltage detection circuit provided on the control circuit board 93 are connected by the voltage detection line 97. .

JP 2009-159767 A

However, the power converter 9 described above has the following problems.
As described above, the intermediate bus bar 96 is fixed to the input connector 95 and the input terminal 921 of the capacitor 92. Since the input connector 95 and the intermediate bus bar 96 are formed of a plate material having an elongated shape, the rigidity is not necessarily high. Therefore, due to insufficient rigidity of the input connector 95 and the intermediate bus bar 96, when the input terminal 921 is fixed to the intermediate bus bar 96 fixed to the input connector 95, the intermediate bus bar 96 wobbles, and the assembling workability deteriorates. .

  Further, the voltage detection line 97 connects between the control circuit board 93 disposed on the upper side of the switching circuit unit 91 and the input voltage distribution unit in the high voltage circuit unit 901 disposed on the lower side of the switching circuit unit 91. Is arranged. That is, the voltage detection line 97 is arranged along the stacking direction of the switching circuit unit 91, the high voltage circuit unit 901, and the low voltage circuit unit 902 so as to connect the low voltage circuit unit 902 and the high voltage circuit unit 901. At this time, an insertion work for inserting the voltage detection line 97 into a gap formed between the pair of intermediate bus bars 96 and the case 98 is required. This insertion work is not workable because the voltage detection line 97 is flexible and the shape is not fixed. Further, in order to improve workability in the insertion work of the voltage detection line 97, it is necessary to increase the gap. In this case, since the physique of the voltage converter 9 becomes large, it is not preferable.

  The present invention has been made in view of the above-described background, and an object of the present invention is to provide a power converter that can improve the assembly workability when assembling parts to an intermediate bus bar.

One embodiment of the present invention is a switching circuit portion including a semiconductor module;
A high-voltage circuit unit disposed adjacent to the switching circuit unit;
A low-voltage circuit unit disposed adjacent to the switching circuit unit at a position opposite to the side on which the high-voltage circuit unit is disposed;
A case for housing the switching circuit unit, the high-voltage circuit unit, and the low-voltage circuit unit;
An input connector electrically connected to the high-voltage circuit unit and disposed closer to the low-voltage circuit unit than the center of the switching circuit unit in the stacking direction of the switching circuit unit, the high-voltage circuit unit, and the low-voltage circuit unit; ,
An intermediate bus bar assembly in which a pair of intermediate bus bars for electrically connecting a pair of connector terminals in the input connector and a pair of input terminals in the high-voltage circuit section are supported by an insulating support;
A voltage detection wire assembly having a pair of voltage detection lines for detecting an input voltage to the high-voltage circuit unit,
The pair of intermediate bus bars are arranged in a standing state in the stacking direction, and a first terminal connected to the input connector and the voltage detection line is arranged on the low voltage circuit unit side, and is connected to the high voltage circuit unit. The second terminal is arranged on the high voltage circuit part side,
When the intermediate bus bar assembly is fixed to a part of the case, the insulating support body includes a first terminal block portion for mounting the first terminal of the intermediate bus bar assembly and a second terminal block for mounting the second terminal. And
The pair of voltage detection lines may be connected to the first terminal in the first terminal block, in the power converter (claim 1).

  The power converter includes an intermediate bus bar assembly including the pair of intermediate bus bars. The insulating support of the intermediate bus bar assembly includes the assembly fixing portion for fixing the intermediate bus bar assembly to a part of the case, and a first terminal base portion for mounting the first terminal of the intermediate bus bar assembly. And a second terminal block portion on which the second terminal is mounted. That is, the intermediate bus bar assembly includes a structure for fixing the intermediate bus bar assembly to the case and an electrical connection structure for inputting / outputting electric power to / from the intermediate bus bar assembly. Thereby, the said bus-bar assembly can be fixed to the said case using the said assembly fixing | fixed part. Therefore, the intermediate bus bar assembly can be stably held.

  Further, the first terminal and the second terminal of the intermediate bus bar are respectively mounted on the first terminal block and the second terminal block of the insulating support. Therefore, when the input connector and the voltage detection line are assembled to the first terminal, or when the input terminal of the high-voltage circuit unit is assembled to the second terminal, the force transmitted to the intermediate bus bar is the first. It can be received by the terminal block or the second terminal block. Therefore, it is possible to reduce the force applied to the intermediate bus bar when the intermediate bus bar is assembled with the input connector, the voltage detection line, and the input terminal. Thereby, the deflection and wobble of the intermediate bus bar can be prevented. Therefore, the workability at the time of the above assembling work can be improved.

  The intermediate bus bar is erected along the stacking direction, and the first terminal is disposed on the low-voltage circuit unit side, and the second terminal is disposed on the high-voltage circuit unit side. And since the said voltage detection line is connected to the said 1st terminal, the said voltage detection line and the said high voltage circuit part can be connected via the said intermediate | middle bus bar. Therefore, the voltage detection line may not be wired so as to extend on both sides of the stacking direction with the switching circuit portion interposed therebetween. Thereby, the connection between the voltage detection line and the high voltage circuit section can be facilitated, and the assembly workability can be improved.

  As mentioned above, according to said aspect, the power converter device which can improve the assembly | attachment workability | operativity at the time of assembling components to an intermediate bus bar can be provided.

Sectional drawing (the AA arrow directional cross-sectional view of FIG. 3) of the power converter device in Example 1. FIG. The main part enlarged view in FIG. 1 (AA arrow directional cross-sectional view of FIG. 3) The partial enlarged plan view of the power converter device in Example 1. FIG. FIG. 3 is an explanatory view showing an intermediate bus bar assembly in the first embodiment. Sectional drawing which shows an intermediate | middle bus bar in the BB arrow of FIG. Sectional drawing which shows the 1st terminal block part and the 2nd terminal block part in the BB arrow of FIG. Sectional drawing which shows the sub electroconductive part in Example 1 (CC sectional view taken on the line CC of FIG. 3). The circuit diagram of the power converter device in Example 1. FIG. Sectional drawing of the power converter device in background art.

  The power converter includes an interlock sensor that detects a connection state of the input connector, and an external wiring that is electrically connected to the interlock sensor and connected to an external device that receives a signal of the interlock sensor. The interlock sensor is built in the input connector, the external wiring is disposed on the side opposite to the input connector in the stacking direction, and the intermediate bus bar assembly is disposed along the stacking direction. A sub-conductive portion may be provided integrally, and the interlock sensor and the external wiring may be connected via the sub-conductive portion.

  In this case, the interlock sensor and the external wiring are connected to each other through the sub conductive portion arranged along the stacking direction, thereby assembling the interlock sensor and the external wiring. Can be easily performed. That is, the interlock sensor arranged on the low voltage circuit part side can be connected to the end part arranged on the low voltage circuit part side in the sub conductive part. Further, the external wiring disposed on the high voltage circuit unit side can be connected to an end of the sub conductive unit on the high voltage circuit unit side. As described above, the structure in which the parts arranged on the high voltage circuit part side or the parts arranged on the low voltage circuit part side are connected to each other facilitates the assembling work and improves the assembling workability. be able to.

  In addition, the intermediate bus bar assembly may include a wiring holding unit that holds an electric wiring arranged so as to connect the low-voltage circuit unit side and the high-voltage circuit unit side. In this case, by holding the electrical wiring in the intermediate bus bar assembly, the electrical wiring can be integrated with the intermediate bus bar assembly into the power converter. That is, the electrical wiring is flexible and easily deforms, so that the assembling workability as a single unit is poor. However, by holding the electrical wiring by the intermediate bus bar assembly, deformation of the electrical wiring can be prevented and assembly of the electrical wiring can be facilitated. Therefore, the electrical wiring can be easily assembled.

  The power converter includes a booster circuit that boosts the voltage of power supplied to the input connector, and the electrical wiring detects the voltage of power output from the booster circuit included in the voltage detection wire assembly. It may also be a boost side detection line. In the power converter, in order to improve the control accuracy, the voltage of the power after being boosted by the booster circuit may be detected. In this case, it is necessary to connect the boost side detection line to the output section of the boost circuit. Even in such a case, the boosting side detection line can be easily assembled.

  In addition, an end portion on the high-voltage circuit portion side of the intermediate bus bar may include an inclined portion formed so as to be away from the input terminal of the high-voltage circuit portion toward the high-voltage circuit portion side. Item 5). In this case, it is possible to prevent the input terminal from entering between the second terminal and the second terminal base portion of the intermediate bus bar. As a result, connection failure between the input terminal and the intermediate bus bar can be prevented.

Example 1
The Example concerning a power converter device is described with reference to FIGS.
As shown in FIG. 1, the power conversion device 1 includes a switching circuit unit 51 including a semiconductor module 510, a high voltage circuit unit 53 disposed adjacent to the switching circuit unit 51, and the high voltage circuit unit 53. And a case 6 for accommodating the low-voltage circuit unit 58, the switching circuit unit 51, the high-voltage circuit unit 53, and the low-voltage circuit unit 58 disposed adjacent to the switching circuit unit 51 at a position opposite to the side.

  In addition, as shown in FIGS. 1 to 4, the power conversion device 1 includes an input connector 3 that is electrically connected to the high-voltage circuit unit 53, and an intermediate bus bar in which a pair of intermediate bus bars 2 are supported by an insulating support 11. The assembly 10 includes a voltage detection wire assembly 4 having a pair of voltage detection lines 41 for detecting an input voltage to the high voltage circuit unit 53. The input connector 3 is arranged closer to the low-voltage circuit unit 58 than the center of the switching circuit unit 51 in the stacking direction Z of the switching circuit unit 51, the high-voltage circuit unit 53, and the low-voltage circuit unit 58. Further, the intermediate bus bar 2 of the intermediate bus bar assembly 10 electrically connects the pair of connector terminals 31 in the input connector 3 and the pair of input terminals 532 in the high voltage circuit unit 53.

  The pair of intermediate bus bars 2 are arranged in a standing state in the stacking direction Z, and the first terminal 21 connected to the input connector 3 and the voltage detection line 41 is arranged on the low voltage circuit unit 58 side, The second terminal 26 to be connected is arranged on the high voltage circuit unit 53 side. The intermediate bus bar assembly 10 includes an assembly fixing portion 12 that fixes the intermediate bus bar assembly 10 to a part of the case 6, a first terminal base portion 13 on which the first terminal 21 of the intermediate bus bar assembly 10 is mounted, and a second terminal 26. And a second terminal block portion 16 on which is mounted. The pair of voltage detection lines 41 is connected to the first terminal 21 in the first terminal block 13.

Hereinafter, the power conversion device 1 will be described in more detail.
In this example, a direction in which the switching circuit unit 51, the low voltage circuit unit 58, and the high voltage circuit unit 53 are stacked is referred to as a stacking direction Z, and a direction in which semiconductor modules 510 in the switching circuit unit 51 described later are stacked is referred to as a lateral direction X. A direction perpendicular to both the stacking direction Z and the lateral direction X is defined as a depth direction Y.
Further, the power conversion device 1 of this example is arranged such that, in the stacking direction Z, the side on which the low-voltage circuit unit 58 is arranged is upward and the opposite side is downward. Therefore, the upper and lower sides in the stacking direction Z are defined in accordance with this. In the depth direction Y, the side on which the intermediate bus bar assembly 10 is disposed is the front side, and the opposite side is the back side.

This example shows a power conversion device mounted on a vehicle such as an electric vehicle or a hybrid car.
As shown in FIG. 1, the power conversion apparatus 1 is switched at a switching circuit unit 51, a high-voltage circuit unit 53 disposed adjacent to the switching circuit unit 51, and a position opposite to the side where the high-voltage circuit unit 53 is disposed. A circuit unit 51 and a low-voltage circuit unit 58 arranged adjacent to each other are provided.
The switching circuit unit 51 is formed by stacking a plurality of semiconductor modules 510 and a plurality of cooling pipes 52 that cool the plurality of semiconductor modules 510 from both main surfaces.

  The semiconductor module 510 includes a switching element such as an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (MOS field effect transistor). The semiconductor module 510 includes a flat plate-shaped semiconductor body 511 formed by resin-molding a switching element, and a main electrode terminal 512 and a control terminal 513 that protrude in opposite directions from the end surface of the semiconductor body 511. The main electrode terminal 512 protrudes downward in the stacking direction Z, and the control terminal 513 protrudes upward in the stacking direction Z. The main electrode terminal 512 is connected to the high voltage circuit unit 53, and the control terminal 513 is connected to the low voltage circuit unit 58.

As shown in FIG. 1, the high voltage circuit unit 53 includes a capacitor 530 having an input terminal 532, a power bus bar 55 connected to the main electrode terminal 512 of the semiconductor module 510, and a reactor 54. (FIG. 8) and an inverter circuit 57 (FIG. 8) are formed. As shown in the figure, the reactor 54 is arranged side by side at a position on the input connector 3 side in the lateral direction Y with respect to the switching circuit unit 51. In the lateral direction Y, a space is formed between the reactor 54 and the side wall portion 612 of the case 6 facing the reactor 54, and the intermediate bus bar assembly 10 is disposed in this space.
As shown in FIG. 8, the capacitor 530 includes three components: a filter capacitor 531, a snubber capacitor 533, and a smoothing capacitor 534.

  As shown in FIG. 8, the booster circuit 56 is configured by connecting a plurality of semiconductor modules 510, a reactor 54, and a filter capacitor 531 by a power bus bar 55. As shown in FIG. 1, the filter capacitor 531 includes an input terminal 532, and the input terminal 532 is connected to the input connector 3 via the intermediate bus bar 2 of the intermediate bus bar assembly 10. DC power supplied from a battery (not shown) is boosted by the booster circuit 56 and then sent to the inverter circuit 57.

As shown in FIG. 8, the inverter circuit 57 includes a plurality of semiconductor modules 510 and a snubber capacitor 533. The inverter circuit 57 converts the boosted DC power into three-phase AC power and supplies it to the three-phase AC motor 71.
A smoothing capacitor 534 is disposed between the booster circuit 56 and the inverter circuit 57.

  As shown in FIG. 1, the low-voltage circuit unit 58 includes a control circuit board 581 connected to the control terminal 513 of the semiconductor module 510. By inputting a control current from the control circuit board 581 to the semiconductor module 510, the operation of the switching element built in the semiconductor module 510 is controlled. The control circuit board 581 includes a voltage detection circuit and a board-side connector 582 connected to the voltage detection circuit. The voltage detection connector 42 of the voltage detection wire assembly 4 is connected to the board side connector 582.

The switching circuit unit 51, the high voltage circuit unit 53, and the low voltage circuit unit 58 are accommodated inside the case 6.
As shown in FIG. 1, the case 6 is arranged so as to surround the switching circuit unit 51, the high-voltage circuit unit 53, and the low-voltage circuit unit 58 from the four sides at the sides, and the case main body unit 61 that is open at the top and bottom, The upper cover body 62 and the lower cover body 63 cover the openings formed in the upper and lower portions of 61. The case main body 61 is formed with an intermediate holding portion 611 arranged so as to cover a part of the opening on the upper side.

The intermediate bus bar assembly 10 is fixed to the intermediate holding part 611 formed in the case main body part 61.
As shown in FIGS. 2 to 4, the intermediate bus bar assembly 10 includes a pair of intermediate bus bars 2 and an insulating support 11 that supports the intermediate bus bar 2.

  As shown in FIGS. 2, 4 and 5, the pair of intermediate bus bars 2 is formed by bending a long flat plate as appropriate at one end and the other end. A portion between these bent portions constitutes a flat bus bar main body 25. The pair of intermediate bus bars 2 are arranged such that the longitudinal direction of the bus bar main body 25 is the stacking direction Z. An engagement hole 251 is formed in the bus bar main body 25 and is configured to be engageable with an engagement claw 173 provided in the insulating support 11.

The upper bent portion of the intermediate bus bar 2 is bent at a right angle with respect to the bus bar main body portion 25 and further bent into a crank shape. The first terminal 21 is formed at this portion.
As shown in FIGS. 2 and 5, the first terminal 21 includes an upper terminal portion 22 connected to the connector terminal 31 of the input connector 3 and a lower terminal portion 24 connected to the voltage detection line 41 of the voltage detection wire assembly 4. And.
The upper terminal portion 22 is arranged so as to stand from the upper end portion of the bus bar main body portion 25 toward the control circuit board 581 side. A press-fit nut 221 is fixed to the lower surface of the upper terminal portion 22, and a bolt 222 inserted into the bolt insertion hole A of the connector terminal 31 of the input connector 3 is screwed into the press-fit nut 221, and the upper terminal portion 22 and the connector terminal 31 are connected.

  As shown in FIG. 2, the input connector 3 includes a connector terminal 31 that is electrically connected to the intermediate bus bar 2, and an interlock sensor 32 that detects the connection state of the input connector 3. The connector terminal 31 has a bolt insertion hole through which the bolt 222 is inserted. The interlock sensor 32 includes a sensor wiring 321 that outputs a detection signal and a sensor connector 322 that is disposed at the tip of the sensor wiring 321. The interlock sensor 32 is electrically connected to an external wiring 72 disposed on the high voltage circuit unit 53 side through a sub conductive unit 18 described later.

  As shown in FIGS. 2 and 5, the lower terminal portion 24 is connected to the lower end of the connecting portion 23 via a connecting portion 23 that hangs down from an end portion that is arranged on the control circuit board 581 side in the lateral direction X of the upper terminal portion 22. To the upper terminal portion 22 in the same direction. That is, the first terminal 21 has a stepped shape including an upper terminal portion 22 and a lower terminal portion 24 arranged below the upper terminal portion 22. A press-fit nut 241 is fixed to the lower surface of the lower terminal portion 24, and a bolt 242 inserted into a bolt insertion hole of the detection terminal portion 411 included in the voltage detection wire 41 is screwed into the press-fit nut 241. The part 24 and the detection terminal part 411 are connected.

As shown in FIGS. 1 and 2, the voltage detection wire assembly 4 includes a pair of voltage detection lines 41 connected to the pair of intermediate bus bars 2 and a boost side detection that detects the voltage of the power output from the boost circuit 56. Line 43. One end of the voltage detection line 41 and the boost side detection line 43 is disposed on the voltage detection connector 42, and the other end of the voltage detection line 41 and the boost side detection line 43 is a detection terminal having a bolt insertion hole formed therethrough. The part 411 is arranged. The boost-side detection line 43 is connected to the power bus bar 55 through which the boosted power flows in the high-voltage circuit unit 53. Incidentally, a pair of voltage detecting lines 41 are voltage detecting portion V _L shown in FIG. _8, detects the voltage of the input power in V _N, the power of the boosted boost detecting line 43 in the voltage detection portion V _H shown in FIG. The voltage is detected.

  A second terminal 26 is formed on the lower end side of the bus bar main body 25. As shown in FIGS. 2 and 5, a press-fit nut 261 is fixed to the second terminal 26, and a bolt 262 inserted into a bolt insertion hole of the input terminal 532 included in the capacitor 530 is screwed into the press-fit nut 261. Thus, the second terminal 26 and the input terminal 532 can be connected. Further, the lower bent portion of the intermediate bus bar 2 forms an inclined portion 263 formed so as to be separated from the input terminal 532 downward from the lower end portion of the second terminal 26.

  As shown in FIGS. 1 and 2, the insulating support 11 is made of an insulating resin and has a substantially L shape when viewed in the depth direction Y. Further, as shown in FIGS. 2 to 4 and 6, the insulating support 11 includes a pair of assembly fixing portions 12 that fix the intermediate bus bar assembly 10 to the intermediate holding portion 611 of the case 6, and a first terminal of the intermediate bus bar 2. 21, a second terminal base part 16 on which the second terminal 26 is mounted, and a sub-conductive part 18 arranged along the stacking direction Z.

  As shown in FIGS. 3 and 4, the assembly fixing portion 12 has a plate shape arranged orthogonal to the stacking direction Z, and a pair of fixing bolt insertion holes 121 are formed at positions on both ends in the depth direction Y. Has been. The intermediate bus bar assembly 10 is fixed to the intermediate holding portion 611 by inserting the fixing bolt 122 into the fixing bolt insertion hole 121 and screwing the fixing bolt 122 into the bolt hole formed in the intermediate holding portion 611 of the case main body 61. It is.

  As shown in FIGS. 2 and 6, the first terminal block 13 includes an upper terminal block 14 on which the upper terminal block 22 is mounted and a lower terminal block 15 on which the lower terminal block 24 is mounted. The upper terminal block portion 14 is formed to protrude upward from the upper surface of the assembly fixing portion 12, and the upper surface forms an upper mounting surface 141 for mounting the upper terminal portion 22 in the intermediate bus bar 2. The upper mounting surface 141 is formed with an upper recess 142 into which a press-fit nut 221 disposed on the upper terminal portion 22 of the intermediate bus bar 2 is fitted.

  The lower terminal block 15 is formed at a lower position than the upper terminal block 14 and has a lower mounting surface 151 on which the lower terminal 24 in the intermediate bus bar 2 is mounted. The lower mounting surface 151 is arranged on the same plane as the upper surface of the assembly fixing portion 12, and forms a lower concave portion 152 into which a press-fit nut 241 arranged on the lower terminal portion 24 of the intermediate bus bar 2 is fitted.

  As shown in FIGS. 2 and 6, a main body support portion 17 where the bus bar main body portion 25 is disposed is formed at a position opposite to the side where the lower terminal block portion 15 is disposed in the lateral direction X of the upper terminal block portion 14. It is. The main body support portion 17 has a substantially quadrangular prism shape, and is arranged so as to hang downward. The main body support portion 17 has a main body portion mounting surface 171 on which the bus bar main body portion 25 is mounted. The main body portion mounting surface 171 includes a flange portion 172 that regulates the position in the depth direction Y, and the bus bar main body portion 25. An engagement claw 173 configured to be engageable with the engagement hole 251 is provided. The flange portion 172 is erected on the bus bar main body portion 25 side from both end portions in the depth direction Y of the main body portion mounting surface 171. The engaging claws 173 are formed at positions corresponding to the engaging holes 251 of the bus bar main body 25 when the intermediate bus bar 2 is mounted on the insulating support 11.

  On the lower end side of the main body support portion 17, a second terminal base portion 16 on which the second terminal 26 of the intermediate bus bar 2 is mounted is provided. The second terminal block 16 has a second mounting surface 161 on which the second terminal 26 is mounted. The second mounting surface 161 has a second recess 162 into which a press-fit nut is fitted.

As shown in FIGS. 3 and 4, a sub conductive portion 18 disposed along the stacking direction Z is disposed between the pair of bus bars 2 disposed in the main body holding portion 17.
As shown in FIGS. 4 and 7, the sub conductive portion 18 includes a pair of conductive members 181 and a conductive member holding portion 182 that is formed integrally with the insulating support 11 and that houses the pair of conductive members 181. Yes. Connector connecting portions 183 are formed at both ends of the conductive member holding portion 182. As shown in FIG. 2, a sensor connector 322 included in the interlock sensor 32 is connected to the connector connecting portion 183 disposed above. An external connector 721 included in the external wiring 72 is connected to the connector connecting portion 183 disposed below.
The external wiring 72 is for transmitting a detection signal detected by the interlock sensor 32 to a control circuit on the vehicle side.

  As shown in FIGS. 3 and 4, the first terminal 21 arranged on the near side in the depth direction Y and the groove formed between the main body support portion 17 and the sub conductive portion 18 are connected to the boost side detection line 43. The wiring holding part 19 to hold | maintain is formed. The wiring holding portion 19 is formed with a holding claw portion 191 that holds the boost side detection line 43, and the boost side detection line 43 is integrally arranged on the insulating support 11.

Next, the function and effect of this example will be described.
The power conversion apparatus 1 includes an intermediate bus bar assembly 10 including a pair of intermediate bus bars 2. The insulating support 11 of the intermediate bus bar assembly 10 includes an assembly fixing portion 12 for fixing the intermediate bus bar assembly 10 to a part of the case 6 and a first terminal base portion on which the first terminal 21 of the intermediate bus bar assembly 10 is mounted. 13 and the second terminal block 16 on which the second terminal 26 is mounted. That is, the intermediate bus bar assembly 10 includes a structure for fixing the intermediate bus bar assembly 10 to the case 6 and an electrical connection structure for inputting / outputting electric power to / from the intermediate bus bar assembly 10. As a result, the bus bar assembly can be fixed to the case 6 using the assembly fixing portion 12. Therefore, the intermediate bus bar assembly 10 can be stably held.

  Furthermore, the first terminal 21 and the second terminal 26 of the intermediate bus bar 2 are respectively mounted on the first terminal block 13 and the second terminal block 16 of the insulating support 11. Therefore, when the input connector 3 and the voltage detection line 41 are assembled to the first terminal 21 or when the input terminal 532 of the high-voltage circuit unit 53 is assembled to the second terminal 26, the force transmitted to the intermediate bus bar 2 is the first terminal. It can be received by the base 13 or the second terminal base 16. Therefore, it is possible to reduce the force applied to the intermediate bus bar 2 when the intermediate bus bar 2 is assembled with the input connector 3, the voltage detection line 41, and the input terminal 532. Therefore, deflection and wobbling of the intermediate bus bar 2 can be prevented. Therefore, workability in the assembly work can be improved.

  The intermediate bus bar 2 is erected along the stacking direction Z. The first terminal 21 is disposed on the low voltage circuit section 58 side, and the second terminal 26 is disposed on the high voltage circuit section 53 side. Therefore, the voltage detection line 41 and the high voltage circuit unit 53 can be connected via the intermediate bus bar 2 by assembling the voltage detection line 41 to the first terminal 21. Therefore, the voltage detection line 41 may not be wired so as to extend on both sides in the stacking direction Z with the switching circuit unit 51 interposed therebetween. Thereby, the connection of the voltage detection line 41 and the high voltage circuit part 53 can be facilitated, and the assembly workability can be improved.

  The power conversion device 1 also includes an interlock sensor 32 that detects the connection state of the input connector 3 and an external device that is electrically connected to the interlock sensor 32 and connected to an external device that receives a signal from the interlock sensor 32. The interlock sensor 32 is built in the input connector 3, the external wiring 72 is arranged on the opposite side of the input connector 3 in the stacking direction Z, and the intermediate bus bar assembly 10 is connected in the stacking direction Z. The sub conductive portions 18 arranged along the line are integrally provided, and the interlock sensor 32 and the external wiring 72 are connected via the sub conductive portions 18.

  For this reason, the interlock sensor 32 and the external wiring 72 are connected via the sub-conductive portion 18 disposed along the stacking direction Z, so that the assembly work between the interlock sensor 32 and the external wiring 72 is facilitated. It can be carried out. That is, the interlock sensor 32 disposed on the low voltage circuit unit 58 side can be connected to the end of the sub conductive unit 18 disposed on the low voltage circuit unit 58 side. Further, an external wiring 72 arranged on the high voltage circuit unit 53 side can be connected to an end of the sub conductive unit 18 on the high voltage circuit unit 53 side. As described above, the structure in which the parts arranged on the high voltage circuit unit 53 side or the parts arranged on the low voltage circuit unit 58 side are connected to each other facilitates the assembling work and improves the assembling workability. be able to.

  Further, the intermediate bus bar assembly 10 includes a wiring holding unit 19 that holds the boost side detection line 43 that is arranged to connect the low voltage circuit unit 58 side and the high voltage circuit unit 53 side. Therefore, by holding the boost side detection line 43 in the intermediate bus bar assembly 10, the boost side detection line 43 can be assembled with the intermediate bus bar assembly 10 into the power converter 1. That is, the boost side detection line 43 is flexible and easily deforms, so that the assembling workability as a single unit is poor. However, by holding the boost side detection line 43 by the intermediate bus bar assembly 10, the boost side detection line 43 can be easily assembled by preventing the boost side detection line 43 from being deformed.

  The intermediate bus bar 2 has an inclined portion 263 formed at the end of the intermediate bus bar 2 on the high voltage circuit portion 53 side so as to be away from the input terminal 532 of the high voltage circuit portion 53 toward the high voltage circuit portion 53 side. Therefore, it is possible to prevent the input terminal 532 from entering between the second terminal 26 of the intermediate bus bar 2 and the second terminal base 16. As a result, connection failure between the input terminal 532 and the intermediate bus bar 2 can be prevented.

  Further, the input connector 3 and the voltage detection wire assembly 4 may be assembled to the intermediate bus bar assembly 10 before the intermediate bus bar assembly 10 is fixed to the intermediate holding portion 611. Further, after the intermediate bus bar assembly 10 is fixed to the intermediate holding portion 611, the input connector 3 and the voltage detection wire assembly 4 may be assembled to the intermediate bus bar assembly 10. When the voltage detection line 43 is held in the wiring holding part 19 of the intermediate bus bar assembly 10, the voltage detection wire assembly 4 is attached to the intermediate bus bar assembly 10 before the intermediate bus bar assembly 10 is fixed to the intermediate holding part 611. It is preferable to assemble it.

Moreover, the press-fit nuts 221, 241, and 261 may be fixed to the intermediate bus bar 2 as described above, or may be fixed to the main body support portion 17 by insert molding. Moreover, the main body support part 17 can also form the internal thread part which screws the volt | bolt 222,242,262 by carrying out the outsert molding of the insulating resin to the base which consists of metals.

  As described above, according to this example, it is possible to provide a power conversion device that can improve the assembling workability when assembling components to the intermediate bus bar.

DESCRIPTION OF SYMBOLS 1 Power converter 10 Intermediate bus bar assembly 11 Insulation support body 13 1st terminal block part 16 2nd terminal block part 2 Intermediate bus bar 21 1st terminal 26 2nd terminal 3 Input connector 31 Connector terminal 4 Voltage detection wire assembly 41 Voltage detection line 51 Switching Circuit Unit 510 Semiconductor Module 53 High Voltage Circuit Unit 532 Input Terminal 58 Low Voltage Circuit Unit 6 Case

Claims (5)

A switching circuit unit equipped with a semiconductor module;
A high-voltage circuit unit disposed adjacent to the switching circuit unit;
A low-voltage circuit unit disposed adjacent to the switching circuit unit at a position opposite to the side on which the high-voltage circuit unit is disposed;
A case for housing the switching circuit unit, the high-voltage circuit unit, and the low-voltage circuit unit;
An input connector electrically connected to the high-voltage circuit unit and disposed closer to the low-voltage circuit unit than the center of the switching circuit unit in the stacking direction of the switching circuit unit, the high-voltage circuit unit, and the low-voltage circuit unit; ,
An intermediate bus bar assembly in which a pair of intermediate bus bars for electrically connecting a pair of connector terminals in the input connector and a pair of input terminals in the high-voltage circuit section are supported by an insulating support;
A voltage detection wire assembly having a pair of voltage detection lines for detecting an input voltage to the high-voltage circuit unit,
The pair of intermediate bus bars are arranged in a standing state in the stacking direction, and a first terminal connected to the input connector and the voltage detection line is arranged on the low voltage circuit unit side, and is connected to the high voltage circuit unit. The second terminal is arranged on the high voltage circuit part side,
When the intermediate bus bar assembly is fixed to a part of the case, the insulating support body includes a first terminal block portion for mounting the first terminal of the intermediate bus bar assembly and a second terminal block for mounting the second terminal. And
The pair of voltage detection lines are connected to the first terminal in the first terminal block, and the power conversion device is characterized in that:   The power converter according to claim 1, wherein the interlock sensor that detects a connection state of the input connector and an external device that is electrically connected to the interlock sensor and receives a signal of the interlock sensor. An external wiring, the interlock sensor is built in the input connector, the external wiring is disposed on the opposite side of the input connector in the stacking direction, and the intermediate bus bar assembly is mounted in the stacking direction. A power conversion device comprising: a sub-conductive portion integrally disposed along the interlock sensor and the external wiring connected via the sub-conductive portion.   3. The power converter according to claim 1, wherein the intermediate bus bar assembly includes a wiring holding unit that holds an electric wiring arranged to connect the low-voltage circuit unit side and the high-voltage circuit unit side. The power converter characterized by the above-mentioned.   The power conversion device according to claim 3, further comprising a booster circuit that boosts a voltage of power supplied to the input connector, wherein the electrical wiring is configured to supply power output from the booster circuit included in the voltage detection wire assembly. A power conversion device characterized by being a boost side detection line for detecting a voltage.   5. The power conversion device according to claim 1, wherein an end of the intermediate bus bar on the high-voltage circuit unit side is connected to the high-voltage circuit unit side from the input terminal of the high-voltage circuit unit. A power conversion device comprising an inclined portion formed so as to be separated.

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