JP6443151B2 - Bus bar module - Google Patents

Description

  The present invention relates to a bus bar module.

  Conventionally, in a power converter that converts power between DC power and AC power, a current flowing through the bus bar is detected and used for control of the power conversion. As a current sensor for detecting a current flowing through such a bus bar, a current sensor having a magnetoresistive element is disclosed in Patent Document 1.

JP 2014-6118 A

  Some power converters include a bus bar module in which a plurality of bus bars are molded on a sealing member. And with the miniaturization of the entire apparatus, the bus bars are easily arranged close to each other in the bus bar module. For this reason, the detection accuracy of the current sensor is lowered due to the influence (disturbance) of the magnetic field generated by the energization of the bus bar adjacent to the current sensor. The configuration disclosed in Patent Document 1 does not take into account the influence of the magnetic field from adjacent bus bars on the current sensor. Therefore, in order to reduce the influence of the magnetic field from the adjacent bus bar on the current sensor, a relatively large shielding plate is provided to secure a large distance from the adjacent bus bar or to block the magnetic field from the adjacent bus bar. The bus bar module tends to be large. As a result, there is room for improvement in downsizing the bus bar module while maintaining the current detection accuracy of the current sensor.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a bus bar module that can improve the detection accuracy of a current sensor and can be miniaturized.

One aspect of the present invention is a sealing member that forms a plate shape and a plurality of bus bars that extend in a direction orthogonal to the thickness direction, and that molds the plurality of bus bars so that their extending directions are parallel to each other. And comprising
The plurality of bus bars include a first bus bar and a pair of stacked bus bars stacked separately in the thickness direction of the first bus bar,
The pair of stacked bus bars are configured to be adjacent to the first bus bar in the width direction perpendicular to the thickness direction and the extending direction, and to allow currents in opposite directions to flow.
At a position where the magnetic fields generated from the pair of laminated bus bars cancel each other, a first current sensor that detects a current value of a current flowing through the first bus bar from a change in the magnetic field is disposed to face the first bus bar. It is in the bus bar module characterized by this.

  The bus bar module is configured such that currents in opposite directions flow through the pair of stacked bus bars. The first current sensor is disposed at a position where the magnetic fields generated from the pair of laminated bus bars cancel each other. Since the influence of the magnetic field generated by the current flowing through the pair of laminated bus bars on the first current sensor is reduced, the detection accuracy of the current value of the current flowing through the first bus bar by the first current sensor is improved. Can do. Furthermore, since the detection accuracy of the first current sensor can be improved, the distance between the pair of laminated bus bars and the first bus bar can be made smaller than before. This contributes to miniaturization of the bus bar module.

  As described above, according to the present invention, it is possible to provide a bus bar module that can improve the detection accuracy of the current sensor and can be miniaturized.

The circuit diagram of the power converter device provided with a bus bar module in Example 1. FIG. The perspective view of the bus bar module in the state which removed the cover in Example 1. FIG. Sectional drawing of the bus bar module in Example 1. FIG. The schematic diagram explaining the positional relationship of a bus bar in Example 1. FIG. The schematic diagram explaining the magnetic field around a bus bar in Example 1. FIG. The schematic diagram explaining the positional relationship of a bus bar in Example 2. FIG. The schematic diagram explaining the positional relationship of a bus bar in Example 3. FIG.

  The bus bar module of the present invention can be used for a power conversion device mounted on an electric vehicle or a hybrid vehicle.

Example 1
The bus bar module according to the embodiment will be described with reference to FIGS.
The bus bar module 1 of this example includes a plurality of bus bars 10, a sealing member 20, and a current sensor 30.
The plurality of bus bars 10 have a plate shape and extend in a direction Y orthogonal to the thickness direction Z.
The sealing member 20 molds the plurality of bus bars 10 so that the extending directions Y thereof are parallel to each other.
The plurality of bus bars 10 include a first bus bar 11 and a pair of stacked bus bars 17 that are stacked apart from each other in the thickness direction Z of the first bus bar 11.
The pair of laminated bus bars 17 are configured to be adjacent to the first bus bar 11 in the width direction X orthogonal to the thickness direction Z and the extending direction Y, and to flow currents A1 and A2 in opposite directions.
At a position where the magnetic fields generated from the pair of laminated bus bars 17 cancel each other, a first current sensor 31 that detects a current value of a current flowing through the first bus bar 11 from a change in the magnetic field is disposed to face the first bus bar 11. Yes.

Hereinafter, the bus bar module 1 of this example will be described in detail.
As shown in FIG. 1, the bus bar module 1 is provided in a power conversion device (not shown) constituting a power conversion circuit 100 including a plurality of semiconductor modules 101. The power converter boosts the DC power of the DC power supply 102 connected to the power conversion circuit 100 by the step-up / down circuit 103. The high-voltage direct current power is converted into three-phase alternating current power by an inverter circuit 104 composed of a plurality of semiconductor modules 101, thereby supplying power to the alternating current load 105.

  As shown in FIGS. 2 and 3, the bus bar module 1 includes a first bus bar 11, a second bus bar 12, a third bus bar 13, a fourth bus bar 14, a fifth bus bar 15, and a sixth bus bar 16 as a plurality of bus bars 10. And a pair of laminated bus bars 17. Each of the plurality of bus bars 10 has a plate shape and extends in a direction Y orthogonal to the thickness direction Z. Each end of the plurality of bus bars 10 is bent in a predetermined direction to form connection terminals described later.

  As shown in FIG. 3, the first to sixth bus bars 11 to 16 are AC bus bars that electrically connect the semiconductor module 10 and the AC load 105. As shown in FIG. 2, the first to sixth bus bars 11 to 16 include semiconductor module connection terminals 11 a to 16 a connected to the semiconductor module 10 and AC load connection terminals 11 b to 16 b connected to the AC load 105. Prepare each.

The pair of laminated bus bars 17 includes a first laminated bus bar 171 and a second laminated bus bar 172. As shown in FIG.
As shown in FIGS. 1 and 2, the first laminated bus bar 171 includes a reactor output side connection terminal 171 a connected to the output side of the reactor 106 and a semiconductor module side connection terminal 171 b connected to the semiconductor module 101. . As shown in FIG. 1, the second laminated bus bar 172 includes a capacitor output side connection terminal 172a connected to the output side of the filter capacitor 107 and a reactor input side connection terminal 172b connected to the input side of the reactor 106. Prepare.

  As shown in FIGS. 2, 3, and 4, the plurality of bus bars 10 are molded on the sealing member 20 so that the extending directions Y thereof are parallel to each other. As shown in FIGS. 2 and 3, the sealing member 20 forms a case main body 21 and a case lid 22. The case body 21 is molded so that the first to sixth bus bars 11 to 16 and the second laminated bus bar 172 are arranged in the width direction X. A first laminated bus bar 171 is molded on the case lid 22. In the state where the case lid 22 is attached to the case main body 21, the first laminated bus bar 171 is arranged in parallel with the second laminated bus bar 172 in the extending direction Y and spaced apart in the thickness direction Z. Are stacked.

  As shown in FIGS. 2 and 3, the case body 21 is formed with a storage portion 21 a in which the current sensor 30 is stored. As the current sensor 30, a first current sensor 31, a second current sensor 32, a third current sensor 33, a fourth current sensor 34, so as to face the bus bars 11 to 16 and 172 molded on the case body 21, respectively. A fifth current sensor 35, a sixth current sensor 36, and a seventh current sensor 37 are provided. Each of the current sensors 31 to 37 is mounted on the current sensor mounting board 25. The current sensor mounting board 25 is fixed to the current sensor mounting board 25 by screws 212 via bosses 211 formed inside the case main body 21. As shown in FIG. 3, the current sensors 31 to 37 are arranged so as to overlap the first to sixth bus bars 11 to 16 and the first stacked bus bar 171 in the Z direction.

  On the other hand, as shown in FIG. 3, a first laminated bus bar 171 is molded in the case lid 22. The first laminated bus bar 171 has the extending direction Y of the first laminated bus bar 171 and the extending direction Y of the second laminated bus bar 172 in parallel with the case lid 22 attached to the case body 21. Are stacked in the Z direction. Thereby, a pair of laminated bus bars 17 is formed. The current sensor 30 is located between the first laminated bus bar 171 and the second laminated bus bar 172. As shown in FIG. 3, in this example, the pair of stacked bus bars 17 are located at the extreme ends in the width direction X in the plurality of bus bars 10.

  As shown in FIG. 4, the current flow direction A1 in the first stacked bus bar 171 and the current flow direction A2 in the second stacked bus bar 172 are opposite to each other. Further, as shown in FIG. 1, the first laminated bus bar 171 is connected to the output side of the reactor 106, and the second laminated bus bar 172 is connected to the input side of the reactor 106. Therefore, the current values flowing through both bus bars 171 and 172 are the same.

  Each of the current sensors 31 to 37 has a magnetoresistive element, and is a GMR (Giant Magneto Resistive) type current sensor that detects a current value from a change in a surrounding magnetic field. A wiring pattern (not shown) is formed on the current sensor mounting substrate 25. Each of the current sensors 31 to 37 is connected to the wiring pattern, and is electrically connected to the control board connection terminal 23 provided to protrude upward in the Z direction in the case body 21 as shown in FIGS. The control board connection terminal 23 is connected to the control board 18.

  As shown in FIG. 3, a shielding plate 40 is molded on the case main body 21 and the case lid 22. The shielding plate 40 is provided at a position sandwiching at least one of the pair of laminated bus bars 17 from the thickness direction Z. In this example, both of the pair of laminated bus bars 17 are provided at positions sandwiching from the thickness direction Z. The shielding plate 40 shields the magnetic field generated from the pair of laminated bus bars 17. Moreover, in this example, also in the 1st-6th bus bars 11-16, the shielding plates 41-46 are provided in the position pinched | interposed from the thickness direction Z.

  Next, the magnetic field around the pair of laminated bus bars 17 will be described. As shown in FIG. 3, the first current sensor 31 is disposed at a position where the first magnetic field B <b> 1 generated from the first stacked bus bar 171 and the second magnetic field B <b> 2 generated from the second stacked bus bar 172 cancel each other. In this example, as shown in FIG. 3, the distance L1 between the first current sensor 31 and the first laminated bus bar 171 and the distance L2 between the first current sensor 31 and the second laminated bus bar 172 are the same. ing. As shown in FIG. 5, among the pair of laminated bus bars 17, the current A1 flows through the first laminated bus bar 171 toward the back of the paper surface, and the current A2 flows through the second laminated bus bar 172 toward the front of the paper surface.

  Thus, the first magnetic field B1 generated from the first stacked bus bar 171 and the second magnetic field B2 generated from the second stacked bus bar 172 are in opposite directions. Therefore, around the first current sensor 31 of the first bus bar 11 adjacent to the pair of laminated bus bars 17, the first magnetic field B1 and the second magnetic field B2 cancel each other. As a result, the influence (disturbance) of the magnetic fields B1 and B2 from the pair of laminated bus bars 17 in the first current sensor 31 of the first bus bar 11 can be suppressed.

  On the other hand, around the seventh current sensor 37 of the second laminated bus bar 172 located between the pair of laminated bus bars 17, the directions of the first magnetic field B1 and the second magnetic field B2 are close to each other. We will strengthen each other. As a result, the S / N ratio in the current sensor 37 of the second laminated bus bar 172 is increased, and the detection accuracy is improved.

Next, the effect in the bus bar module 1 of this example is explained in full detail.
In the bus bar module 1 of this example, the pair of laminated bus bars 17 are configured such that currents A1 and A2 in opposite directions flow. The first current sensor 31 is arranged at a position where the magnetic fields generated from the pair of laminated bus bars 17 cancel each other. As a result, the influence of the magnetic field generated by the current flowing through the pair of laminated bus bars 17 on the first current sensor 31 is reduced. Therefore, the current value of the current flowing through the first bus bar 11 by the first current sensor 31 is reduced. Detection accuracy can be improved. Furthermore, since the detection accuracy of the first current sensor 31 can be improved, the distance D1 between the pair of laminated bus bars 17 and the first bus bars 11 can be made smaller than before. This contributes to downsizing of the bus bar module 1.

  In this example, the distance L1 between the first current sensor 31 and the first laminated bus bar 171 and the distance L2 between the first current sensor 31 and the second laminated bus bar 172 are the same. That is, the current values A <b> 1 and A <b> 2 of the currents flowing through the pair of stacked bus bars 17 are the same, and the first current sensor 31 is located at an equal distance from both of the pair of stacked bus bars 17. As a result, the magnetic fields B1 and B2 of the pair of laminated bus bars 17 are reliably canceled around the first current sensor 31. As a result, the detection accuracy of the first current sensor 31 can be further improved.

  In this example, a pair of shielding plates 40 for shielding the magnetic fields B1 and B2 generated from the laminated bus bar 17 are provided at positions where both of the pair of laminated bus bars 17 are sandwiched from the thickness direction Z. Accordingly, since the pair of shielding plates 40 shield the magnetic fields B1 and B2, the influence (disturbance) of the magnetic fields B1 and B2 from the laminated bus bar 17 on the first current sensor 31 in the adjacent first bus bar 11 can be suppressed. it can. As a result, the detection accuracy of the first current sensor 31 can be improved.

  In this example, the pair of shielding plates 40 are provided at positions where both of the pair of laminated bus bars 17 are sandwiched from the thickness direction Z. Instead, either one of the pair of laminated bus bars 17 is arranged in the thickness direction. You may provide in the position pinched | interposed from Z. For example, in the modification shown in FIG. 6, the pair of shielding plates 40 is provided at a position where the first laminated bus bar 171 is sandwiched from the thickness direction Z among the pair of laminated bus bars 17. Even in this case, the same effects as the present example are achieved.

  The arrangement of the pair of laminated bus bars 17 in the plurality of bus bars 10 is in accordance with the arrangement of the counterpart member (reactor 106 in this example) to which the pair of laminated bus bars 17 are connected, ease of handling of the bus bars, and the like. Can be changed as appropriate. In the present example, the pair of laminated bus bars 17 are located at the extreme ends in the width direction X in the plurality of bus bars 10. As a result, in the configuration in which the second stacked bus bar 172 is positioned at the extreme end in the width direction X in the plurality of bus bars 10, the first stacked bus bars 171 are simply stacked as described above, as in the present example. The detection accuracy of the first current sensor 31 in the 1 bus bar 11 can be improved.

  In the plurality of bus bars 10, at least one bus bar among the plurality of bus bars 10 may be positioned in both the width directions X of the pair of stacked bus bars 17. For example, in the modification shown in FIG. 7, the first bus bar 11 is located on one side of the pair of laminated bus bars 17 in the width direction X, and the second bus bar 12 is located on the other side. In this case, the influence (disturbance) of the magnetic fields B <b> 1 and B <b> 2 from the pair of laminated bus bars 17 can be suppressed also on the current sensor 32 in the second bus bar 12 of the member connected to the pair of laminated bus bars 17. Therefore, the distance d1 between the pair of laminated bus bars 17 and the first bus bar 11 in the width direction X can be reduced, and the distance d3 between the pair of laminated bus bars 17 and the second bus bar 12 in the width direction X can also be reduced. Can do. Thus, since both can be made small, it contributes further to size reduction of the bus bar module 1.

  In this example, the pair of laminated bus bars 17 are connected to the input terminal and the output terminal of the reactor 106 constituting the step-up / down circuit 103, respectively. Thereby, the current value of the current flowing through the first laminated bus bar 171 and the current value of the current flowing through the second laminated bus bar 172 are always the same current value, and both are connected to the same reactor 106, It is easy to be disposed at a relatively close position. Therefore, the pair of stacked bus bars 17 can be easily configured by stacking the first stacked bus bars 171 and the second stacked bus bars 172 so that the directions of current flow are opposite to each other.

  The target to which the first stacked bus bar 171 and the second stacked bus bar 172 are connected is not limited as long as the current values of the currents flowing through both the bus bars 171 and 172 are the same and the flow directions can be reversed. Further, the connection target may be the same or different between the first stacked bus bar 171 and the second stacked bus bar 172.

  As described above, according to this example, it is possible to provide the bus bar module 1 that can improve the detection accuracy of the current sensor 31 and can be miniaturized.

DESCRIPTION OF SYMBOLS 1 Bus bar module 10 Several bus bar 11 1st bus bar 12 2nd bus bar 17 A pair of laminated bus bar 171 1st laminated bus bar 172 2nd laminated bus bar 20 Sealing member 21 Case main body 22 Case lid 30 Current sensor 31 1st current sensor 40 Shielding Board 106 Reactor

Claims (6)

A plurality of bus bars (10) that form a plate shape and extend in a direction perpendicular to the thickness direction, and a sealing member that molds the plurality of bus bars (10) so that their extending directions are parallel to each other ( 20), and
The plurality of bus bars (10) include a first bus bar (11) and a pair of stacked bus bars (17) stacked apart from each other in the thickness direction of the first bus bar (11).
The pair of laminated bus bars (17) are configured to be adjacent to the first bus bar (11) in the width direction perpendicular to the thickness direction and the extending direction, and to allow currents in opposite directions to flow. ,
At a position where the magnetic fields generated from the pair of laminated bus bars (17) cancel each other, a first current sensor (31) for detecting the current value of the current flowing through the first bus bar (11) from the change of the magnetic field is the first. A bus bar module (1), which is disposed to face the bus bar (11).   The current values of the currents flowing through the pair of stacked bus bars (17) are the same, and the first current sensor (31) is located at an equal distance from both of the pair of stacked bus bars (17). The bus bar module according to claim 1.   A pair of shielding plates (40) for shielding a magnetic field generated from the laminated bus bar (17) is provided at a position sandwiching at least one of the pair of laminated bus bars (17) from the thickness direction. Item 3. The bus bar module (1) according to item 1 or 2.   The bus bar module (1) according to any one of claims 1 to 3, wherein the pair of laminated bus bars (17) are located at the extreme ends in the width direction of the plurality of bus bars (10). 1).   The at least one bus bar (12) among the plurality of bus bars (10) is positioned in both of the width directions of the pair of laminated bus bars (17). Bus bar module (1) according to item.   The pair of laminated bus bars (17) are configured to be respectively connected to an input terminal and an output terminal of a reactor (106) constituting the step-up / down circuit (103). Bus bar module (1) given in any 1 paragraph.

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