JP2019004633A - Electric power conversion system - Google Patents

Abstract

To reduce a conduction noise while suppressing the increase of the number of components.SOLUTION: An electric power conversion system 10 comprises an insulation type DC/DC converter. The DC/DC converter comprises: a transformer; a primary side circuit provided on a primary side of the transformer; and a secondary side circuit provided on a secondary side of the transformer. The primary side circuit comprises a primary side positive bus bar 61 and a primary side negative bus bar 62 to which a primary side voltage is applied. The secondary side circuit comprises a secondary side positive bus bar 63 and a secondary side negative bus bar 64 to which the secondary side voltage is applied. The electric power conversion system 10 comprises a bus bar module 60 in which bus bars 61, 62, 63, 64 that the primary side positive bus bar 61, the primary side negative bus bar 62, the secondary side negative bus bar 64, and the secondary side positive bus bar 63 are arranged in this order are laminated through a resin part 70.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power conversion device.

  As a power converter provided with an insulation type DC / DC converter, it is indicated by patent documents 1, for example. The insulated DC / DC converter includes a switching element and a transformer. And voltage conversion is performed by operation | movement of a switching element. Due to the switching operation of the switching element, conduction noise is generated in the DC / DC converter. In order to reduce this conduction noise, it is known that the primary side and secondary side of the transformer are connected by a bypass capacitor.

JP 2006-192889 A

By the way, when a bypass capacitor is added, the number of parts increases by the amount of the bypass capacitor.
The objective of this invention is providing the power converter device which can reduce conduction noise, suppressing the increase in a number of parts.

  A power conversion device that solves the above problem is a power conversion device including an insulation type DC / DC converter, and the DC / DC converter includes a transformer, a primary circuit of the transformer, and two of the transformers. A secondary side circuit, wherein the primary side circuit includes a primary positive bus bar and a primary negative bus bar to which a primary side voltage is applied, and a secondary side voltage is applied to the secondary circuit. Secondary side positive electrode bus bar and secondary side negative electrode bus bar, the primary side positive electrode bus bar, the primary side negative electrode bus bar, the secondary side negative electrode bus bar, and the secondary side positive electrode bus bar in this order through the resin portion A bus bar module in which each bus bar is stacked is provided.

  According to this, by laminating the primary-side negative electrode bus bar and the secondary-side negative electrode bus bar, a capacitance is generated between them. That is, it can be considered that the primary circuit and the secondary circuit are connected by a bypass capacitor having two bus bars as electrode plates. Thereby, the noise flowing to the ground can be shunted to the bypass capacitor, and the conduction noise can be reduced. Since the conduction noise can be reduced by the arrangement of the bus bars, the conduction noise can be reduced while suppressing an increase in the number of components.

  The power converter may include a heat sink to which the bus bar module is bonded via an insulating layer, and each bus bar may be arranged perpendicular to the surface of the heat sink on which the insulating layer is provided.

  According to this, compared with the case where each bus bar is arranged so as to be parallel to the heat sink, the facing area between each bus bar and the heat sink is reduced. By reducing the stray capacitance generated between each bus bar and the heat sink, conduction noise can be reduced.

  In the power converter, each bus bar is embedded in the resin part, and the bus bar module includes a primary positive electrode member extending from the primary positive bus bar to the outside of the resin part, and the primary A primary negative electrode member extending from the side negative bus bar to the outside of the resin part, a secondary positive electrode member extending from the secondary positive bus bar to the outside of the resin part, and the resin from the secondary negative bus bar A secondary-side negative electrode member extending to the outside of the unit, wherein the primary-side positive electrode member and the primary-side negative electrode member are connected to a circuit element constituting the primary-side circuit, The secondary positive electrode member and the secondary negative electrode member are connected to a circuit element constituting the secondary circuit, and each electrode member is connected to the heat sink via the resin portion and the insulating layer. It may be in direction.

  According to this, the resin part and the insulating layer are interposed between each electrode member connecting each bus bar and the circuit element and the heat sink. Each electrode member is separated from the heat sink by the resin portion and the insulating layer, and stray capacitance generated between each electrode member and the heat sink can be reduced. Therefore, conduction noise can be further reduced.

  According to the present invention, it is possible to reduce conduction noise while suppressing an increase in the number of parts.

The circuit diagram of the power converter in an embodiment. Sectional drawing of the power converter device in embodiment. The 3-3 line sectional view of Drawing 2 showing the power converter in an embodiment.

Hereinafter, an embodiment of the power conversion device will be described. The power converter of this embodiment is mounted on a vehicle.
As shown in FIG. 1, the vehicle includes a power conversion device 10 and a battery B. The vehicle is an electric vehicle using an electric motor as a drive source or a hybrid vehicle. The battery B is a chargeable / dischargeable power storage device and is used as a power source of an electric motor mounted on a vehicle.

  The power conversion device 10 includes an input end 12 to which an AC power supply 11 is connected. The AC power supply 11 is a system power supply used in a general home. Although not shown, the AC power supply 11 is connected to the input terminal 12 using a home charging facility installed in the home. The power conversion device 10 is used as an in-vehicle charger that charges the battery B by converting AC power input from the AC power source 11 into DC power and outputting the DC power.

  As shown in FIG. 1, the power conversion device 10 includes an AC filter (AC filter) 20, a PFC (power factor correction circuit) 25, a DC / DC converter 30, and a DC filter (DC filter) 40. .

  The AC filter 20 is provided between the AC power supply 11 connected to the input terminal 12 and the PFC 25, and removes noise from the AC power input from the AC power supply 11. In addition, the AC filter 20 reduces conduction noise generated in the power conversion device 10, thereby suppressing conduction noise from flowing into the AC power supply 11.

  The AC filter 20 includes three X capacitors (across the line capacitors) CX, two common choke coils 21 and 22, and four Y capacitors (line bypass capacitors) CY1. The AC filter 20 is a two-stage filter including two common choke coils 21 and 22.

  Both the common choke coils 21 and 22 each include two windings L1 and L2 wound around a single core. The winding directions of both windings L1, L2 are opposite to each other. The windings L1 of the two common choke coils 21 and 22 are connected in series, and the windings L2 are connected in series.

  The X capacitor CX is provided between the input terminal 12 and the common choke coil 21, between the common choke coils 21 and 22, and between the common choke coil 22 and the PFC 25, respectively.

  The two Y capacitors CY1 are connected in series to form a series circuit of the Y capacitors CY1. By providing two series circuits of Y capacitors CY1, the AC filter 20 includes a total of four Y capacitors CY1. The series circuit of the Y capacitor CY1 is provided between the common choke coils 21 and 22 and between the common choke coils 21 and 22 and the PFC 25, respectively. The X capacitor CX and the series circuit of the Y capacitor CY1 are connected in parallel. The midpoint between the Y capacitors CY1 connected in series is grounded (grounded) to the vehicle body.

  In the AC filter 20 described above, common mode noise is reduced by the windings L1 and L2 and the Y capacitor CY1, and normal mode noise is reduced by the leakage inductance of the common choke coils 21 and 22 and the X capacitor CX.

The PFC 25 is provided between the AC filter 20 and the DC / DC converter 30, converts an AC voltage into a DC voltage and outputs the DC voltage to the DC / DC converter 30 while improving the power factor.
The PFC 25 includes one coil L3, two diodes D1 and D2, two switching elements Q1 and Q2, and one smoothing capacitor C1.

  MOSFETs are used as the switching elements Q1 and Q2. Each switching element Q1, Q2 constitutes a series circuit of switching elements Q1, Q2 by being connected in series with each other. Specifically, the drain of the switching element Q2 is connected to the source of the switching element Q1.

  The diodes D1 and D2 are connected in series to form a series circuit of the diodes D1 and D2. Specifically, the cathode of the diode D2 is connected to the anode of the diode D1.

  The drain of the switching element Q1 and the cathode of the diode D1 are connected to the first positive line L11. The source of the switching element Q2 and the anode of the diode D2 are connected to the first negative line L12. Thereby, the series circuit of the switching elements Q1 and Q2 and the series circuit of the diodes D1 and D2 are connected in parallel.

  An output end of the AC filter 20 is connected to a midpoint between the switching element Q1 and the switching element Q2 (a connection portion that connects the switching elements Q1 and Q2) via a coil L3. The output end of the AC filter 20 is connected to a midpoint between the diode D1 and the diode D2 (a connection portion that connects the diodes D1 and D2).

One end of the smoothing capacitor C1 is connected to the first positive electrode wiring L11, and the other end of the smoothing capacitor C1 is connected to the first negative electrode wiring L12.
In the PFC 25 described above, the switching elements Q1 and Q2 are switched (on / off operation) by a control device (not shown), whereby the DC / DC converter 30 is connected via the first positive electrode wiring L11 and the first negative electrode wiring L12. Is supplied with a DC voltage.

The DC / DC converter 30 is an insulated DC / DC converter provided between the PFC 25 and the DC filter 40.
The DC / DC converter 30 includes one bridge circuit 31, two diodes D3 and D4, two coils L4 and L5, one transformer 32, one rectifier circuit 35, one smoothing capacitor C2, Is provided.

  The bridge circuit 31 provided on the primary side of the transformer 32 includes four switching elements Q3, Q4, Q5, and Q6. MOSFETs are used as the switching elements Q3, Q4, Q5, and Q6. Switching element Q3 and switching element Q4 are connected in series to form a series circuit of switching elements Q3 and Q4. Specifically, the drain of the switching element Q4 is connected to the source of the switching element Q3. Similarly, switching element Q5 and switching element Q6 are connected in series.

  The diodes D3 and D4 provided on the primary side of the transformer 32 are connected in series to form a series circuit of the diodes D3 and D4. Specifically, the cathode of the diode D4 is connected to the anode of the diode D3.

  The drains of the switching elements Q3 and Q5 are connected to the first positive electrode wiring L11. The sources of the switching elements Q4 and Q6 are connected to the first negative line L12. The cathode of the diode D3 is connected to the first positive line L11. The anode of the diode D4 is connected to the first negative line L12. Thereby, the series circuit of switching element Q3 and switching element Q4, the series circuit of switching element Q5 and switching element Q6, and the series circuit of diodes D3 and D4 are connected in parallel.

  The bridge circuit 31, the diodes D3 and D4, the first positive electrode wiring L11, and the first negative electrode wiring L12 serve as a primary circuit E1 provided on the primary side of the transformer 32. The switching elements Q3, Q4, Q5, Q6 and the diodes D3, D4 are circuit elements that constitute the primary side circuit E1.

  In the present embodiment, the first positive electrode wiring L11 and the first negative electrode wiring L12 are also part of the PFC 25. Therefore, it can be said that the PFC 25 and the primary circuit E1 include the common first positive electrode wiring L11 and the first negative electrode wiring L12. The first positive electrode wiring L11 and the first negative electrode wiring L12 are wirings for inputting a DC voltage to the DC / DC converter 30 (primary side circuit E1). A primary side voltage, that is, a DC voltage before voltage conversion by the DC / DC converter 30 is applied to the first positive electrode wiring L11 and the first negative electrode wiring L12.

  The transformer 32 includes a primary side winding 33 and a secondary side winding 34. One end of the primary winding 33 is connected to the midpoint between the switching elements Q3 and Q4 via the coil L4, and the other end of the primary winding 33 is the midpoint between the switching elements Q5 and Q6. It is connected to the.

  The rectifier circuit 35 provided on the secondary side of the transformer 32 includes four diodes D5, D6, D7, and D8. The diode D5 and the diode D6 are connected in series to form a series circuit of the diodes D5 and D6. Specifically, the cathode of the diode D6 is connected to the anode of the diode D5. Similarly, the diode D7 and the diode D8 are connected in series with each other. The cathodes of the diodes D5 and D7 are connected to the second positive electrode wiring L21. The anodes of the diodes D6 and D8 are connected to the second negative line L22. Thereby, the series circuit of the diodes D5 and D6 and the series circuit of the diodes D7 and D8 are connected in parallel.

One end of the secondary winding 34 is connected to the midpoint of the diodes D5 and D6, and the other end of the secondary winding 34 is connected to the midpoint of the diodes D7 and D8.
The coil L5 is provided as a part of the second positive electrode wiring L21. One end of the smoothing capacitor C2 is connected to the second positive electrode wiring L21, and the other end of the smoothing capacitor C2 is connected to the second negative electrode wiring L22.

  The rectifier circuit 35, the smoothing capacitor C2, the second positive electrode wiring L21, and the second negative electrode wiring L22 form a secondary circuit E2 provided on the secondary side of the transformer 32. The diodes D5, D6, D7, and D8 are circuit elements constituting the secondary side circuit E2.

  In the present embodiment, the second positive electrode wiring L21 and the second negative electrode wiring L22 are also part of the DC filter 40. Therefore, it can be said that the DC filter 40 and the secondary side circuit E2 include the common second positive electrode wiring L21 and the second negative electrode wiring L22. The second positive line L21 and the second negative line L22 are lines that output a DC voltage from the DC / DC converter 30 (secondary circuit E2). A secondary side voltage, that is, a DC voltage after voltage conversion by the DC / DC converter 30 is applied to the second positive line L21 and the second negative line L22.

  In the DC / DC converter 30 described above, the switching elements Q3, Q4, Q5, and Q6 are switched by a control device (not shown). Thereby, the DC voltage input from the first positive electrode wiring L11 and the first negative electrode wiring L12 is converted into a DC voltage of a different voltage according to the charging state of the battery B (voltage conversion is performed). . Then, the DC voltage after voltage conversion is output from the second positive electrode wiring L21 and the second negative electrode wiring L22.

  The DC filter 40 includes one common choke coil 41 and four Y capacitors CY2. The common choke coil 41 has the same configuration as the common choke coils 21 and 22 described above, and includes two windings L6 and L7. The two Y capacitors CY2 are connected in series to form a series circuit of Y capacitors CY2. By providing two series circuits of Y capacitors CY2, the DC filter 40 includes a total of four Y capacitors CY2. The midpoint between the Y capacitors CY2 connected in series is grounded (grounded) to the vehicle body. The DC filter 40 reduces noise included in the DC voltage.

  As shown in FIGS. 2 and 3, the power conversion device 10 includes an insulating layer 51, a heat sink 52 bonded to the insulating layer 51, a conductor layer 53 bonded to the insulating layer 51, and a conductor layer 53. The semiconductor layer 54 bonded and the bus bar module 60 bonded to the insulating layer 51 are provided. These members constitute a PFC 25 and a DC / DC converter 30 that are members relating to voltage conversion.

  The insulating layer 51 is an insulating substrate made of, for example, ceramic. A conductor layer 53 is provided on one of both surfaces of the insulating layer 51. A heat sink 52 is provided on the opposite surface of the insulating layer 51 to the surface on which the conductor layer 53 is provided.

  The heat sink 52 radiates heat generated by heat-generating components such as the switching elements Q1 to Q6. The heat sink 52 of the present embodiment is a plate-shaped metal plate. The heat sink 52 is grounded (grounded) to the vehicle body. As the heat sink 52, an air-cooled type or a liquid-cooled type may be used.

  The conductor layer 53 is a conductor pattern made of copper, aluminum, or the like. A semiconductor layer 54 is bonded to the conductor layer 53. The semiconductor layer 54 constitutes switching elements Q1 to Q6 and diodes D1 to D8. The conductor layer 53 serves as a connection part (wiring) that connects the switching elements Q1 to Q6 and a connection part (wiring) that connects the diodes D1 to D8.

  The bus bar module 60 includes four bus bars 61, 62, 63, 64 and a resin portion 70, and the bus bars 61, 62, 63, 64 are integrated by the resin portion 70. The bus bar module 60 includes four electrode members 81, 82, 83, and 84 (terminals).

  The resin part 70 includes a rectangular parallelepiped first portion 71 and a rectangular parallelepiped second portion 72 protruding from the first portion 71. The first part 71 and the second part 72 are integral. The second part 72 is slightly smaller than the first part 71, and a step is formed by the second part 72 and the first part 71. More specifically, in the plan view of the bus bar module 60, the longitudinal dimension L31 of the first part 71 is longer than the longitudinal dimension L32 of the second part 72, and the lateral dimension L33 of the first part 71 is It is longer than the dimension L34 of the second portion 72 in the short direction. In addition, the longitudinal direction of the 1st site | part 71 and the longitudinal direction of the 2nd site | part 72 are the same directions, and a transversal direction is also the same direction. Accordingly, the resin portion 70 includes a base surface 73 provided so that the first portion 71 surrounds the second portion 72.

  The four bus bars 61, 62, 63, 64 are a primary positive electrode bus bar 61, a primary negative electrode bus bar 62, a secondary positive electrode bus bar 63, and a secondary negative electrode bus bar 64. Each bus bar 61, 62, 63, 64 has a flat plate shape. The primary side positive bus bar 61 constitutes a first positive line L11 and the primary side negative bus bar 62 constitutes a first negative line L12. The primary positive electrode bus bar 61 and the primary negative electrode bus bar 62 are provided in the primary side circuit E1 and serve as bus bars to which the primary side voltage is applied. The secondary-side positive bus bar 63 constitutes a second positive electrode wiring L21, and the secondary-side negative bus bar 64 constitutes a second negative electrode wiring L22. The secondary-side positive bus bar 63 and the secondary-side negative bus bar 64 are provided in the secondary-side circuit E2 and serve as bus bars to which a secondary-side voltage is applied.

  Each bus bar 61, 62, 63, 64 is laminated via a part of the resin portion 70 in the order of the primary positive electrode bus bar 61, the primary negative electrode bus bar 62, the secondary negative electrode bus bar 64, and the secondary positive electrode bus bar 63. The bus bars 61, 62, 63, 64 are arranged to face each other. That is, the bus bars 61, 62, 63, 64 are arranged so that the two negative bus bars 62, 64 are sandwiched between the positive bus bars 61, 63.

  Thereby, the primary positive electrode bus bar 61 and the primary negative electrode bus bar 62 are adjacent to each other, and the secondary positive electrode bus bar 63 and the secondary negative electrode bus bar 64 are adjacent to each other. That is, the positive and negative bus bars 61, 62, 63, 64 are adjacent to each other on the primary side and the secondary side.

  The direction in which the bus bars 61, 62, 63, 64 are arranged is a direction orthogonal to the direction in which the first portion 71 and the second portion 72 overlap (the direction in which the second portion 72 protrudes from the first portion 71). Each bus bar 61, 62, 63, 64 is arranged so that the surfaces in the thickness direction face each other. That is, the direction in which the bus bars 61, 62, 63, 64 are arranged and the thickness direction of the bus bars 61, 62, 63, 64 are the same direction. Each bus bar 61, 62, 63, 64 is arranged so as to extend between the pedestal surface 73 and the joint surface 74 opposite to the pedestal surface 73 in the first portion 71.

The bus bars 61, 62, 63, 64 are entirely embedded in the resin part 70 and are not exposed outside the resin part 70.
The four electrode members 81, 82, 83, 84 include a primary positive electrode member 81 connected to the primary positive bus bar 61, and a primary negative electrode member 82 connected to the primary negative bus bar 62. They are a secondary positive electrode member 83 connected to the secondary positive bus bar 63 and a secondary negative electrode member 84 connected to the secondary negative bus bar 64. Each electrode member 81, 82, 83, 84 is integral with each bus bar 61, 62, 63, 64.

  Each electrode member 81, 82, 83, 84 has a flat plate shape. Each electrode member 81, 82, 83, 84 is provided slightly closer to the second portion 72 than the boundary between the first portion 71 and the second portion 72. Each electrode member 81, 82, 83, 84 extends vertically from each bus bar 61, 62, 63, 64. Specifically, each positive electrode member 81, 83 extends in the thickness direction of each positive bus bar 61, 63. Each negative electrode member 82, 84 extends in a direction along the pedestal surface 73 in a direction orthogonal to the thickness direction of each negative electrode bus bar 62, 64.

  Each electrode member 81, 82, 83, 84 extends from each bus bar 61, 62, 63, 64 toward the pedestal surface 73. A part of each electrode member 81, 82, 83, 84 protrudes from the resin part 70 to become an exposed part 85 exposed to the outside of the resin part 70. The exposed portion 85 is provided on the pedestal surface 73.

  The joining surface 74 of the bus bar module 60 is joined to the insulating layer 51 with an adhesive or the like. Thereby, each bus bar 61, 62, 63, 64 is arranged perpendicularly to the surface 55 of the heat sink 52 provided with the insulating layer 51. Of the surfaces of each bus bar 61, 62, 63, 64, the surface in the thickness direction which is the widest surface and the heat sink 52 do not face each other, and the side surfaces of each bus bar 61, 62, 63, 64 are Surface) A faces the surface 55 of the heat sink 52. Here, “vertical” allows a slight inclination of the bus bars 61, 62, 63, 64 with respect to the heat sink 52.

Each electrode member 81, 82, 83, 84 faces the heat sink 52 via the resin portion 70 (first portion 71) and the insulating layer 51.
The power converter 10 includes bonding wires 86 that electrically connect the electrode members 81, 82, 83, and 84 and the semiconductor layer 54. The bus bars 61, 62, 63, and 64 are electrically connected to the switching elements Q1 to Q6 and the diodes D1 to D8 via the bonding wire 86 and the electrode members 81, 82, 83, and 84, respectively. The bonding wire 86 and the electrode members 81, 82, 83, and 84 are connected to the switching elements Q1 to Q6 and the diodes D1 to D8 and the connection portions (wirings) that connect the bus bars 61, 62, 63, and 64, respectively. Become.

Next, the effect | action of the power converter device 10 of this embodiment is demonstrated.
When the battery B is charged, a current flows through each bus bar 61, 62, 63, 64. By allowing the positive and negative bus bars 61, 62, 63, 64 to be adjacent to each other, the direction of current flow is opposite between the adjacent bus bars 61, 62, 63, 64. Then, the leakage inductance can be reduced by canceling out the magnetic fluxes.

  Furthermore, the primary negative electrode bus bar 62 and the secondary negative electrode bus bar 64 are disposed adjacent to each other, so that the two bus bars 62 and 64 facing each other function as an electrode plate that forms a capacitor. Capacitance is generated between them. Then, as shown in FIG. 1, the primary side circuit E1 of the transformer 32 and the secondary side circuit E2 of the transformer 32 can be regarded as being connected via the bypass capacitor CB. As a result, the current (noise) flowing to the ground can be shunted to the bypass capacitor CB, and noise can be prevented from flowing to the ground. Thereby, conduction noise can be reduced.

  Furthermore, by arranging the bus bars 61, 62, 63, 64 perpendicularly to the surface 55 of the heat sink 52, the surface of each bus bar 61, 62, 63, 64 in the thickness direction does not face the heat sink 52. . Since the heat sink 52 is grounded, if the electrostatic capacitance (floating capacitance) between the heat sink 52 and each of the bus bars 61, 62, 63, 64 is increased, conduction noise is increased.

  More specifically, the magnitude of the conduction noise can be expressed by C · dv / dt. C is a stray capacitance generated between the heat sink 52 and each of the bus bars 61, 62, 63, 64, v is a voltage, and t is time. As the stray capacitance C increases, the conduction noise caused by the voltage fluctuation dv / dt accompanying the switching operation increases.

  As the facing area between each bus bar 61, 62, 63, 64 and the heat sink 52 increases, the stray capacitance generated between each bus bar 61, 62, 63, 64 and the heat sink 52 increases, but each bus bar 61, 62 increases. , 63, 64 are arranged vertically to reduce the facing area, so that generation of conduction noise can be suppressed.

Therefore, according to the above embodiment, the following effects can be obtained.
(1) By devising the arrangement position of each bus bar 61, 62, 63, 64, the primary negative bus bar 62 and the secondary negative bus bar 64 can be used as an electrode plate for forming the bypass capacitor CB. That is, the bus bars 62 and 64 used for DC voltage input and output can also be used as the bypass capacitor CB. By forming a bypass capacitor CB with the primary negative bus bar 62 and the secondary negative bus bar 64, a dedicated bypass for connecting the primary circuit E1 of the transformer 32 and the secondary circuit E2 of the transformer 32. Conductive noise can be reduced without adding a capacitor. Therefore, conduction noise can be reduced while suppressing the addition of components.

  (2) Since a portion of the resin portion 70 is interposed between the primary negative electrode bus bar 62 and the secondary negative electrode bus bar 64, the primary negative electrode bus bar 62 and the secondary negative electrode bus bar 64 are interposed. As compared with the case where air is interposed in the capacitor, the capacitance can be increased.

  (3) The bus bars 61, 62, 63, 64 are provided so that the positive and negative bus bars 61, 62, 63, 64 are adjacent to each other. Thereby, the magnetic flux generated by the current flowing through each bus bar 61, 62, 63, 64 can be canceled out, and the leakage inductance can be reduced.

  (4) The stray capacitance generated between each bus bar 61, 62, 63, 64 and the surface 55 of the heat sink 52 by arranging each bus bar 61, 62, 63, 64 perpendicular to the surface 55 of the heat sink 52. The conduction noise can be further suppressed.

  (5) The resin part 70 and the insulating layer 51 are interposed between the electrode members 81, 82, 83, 84 and the heat sink 52. Accordingly, the electrode members 81, 82, 83, 84 are separated from the heat sink 52 by the resin portion 70 and the insulating layer 51. Accordingly, the distance between each electrode member 81, 82, 83, 84 and the heat sink 52 can be increased, and the stray capacitance between each electrode member 81, 82, 83, 84 and the heat sink 52 can be reduced. Can do. Thereby, conduction noise can be further reduced.

  (6) Since each bus bar 61, 62, 63, 64 is arranged perpendicular to the surface 55 of the heat sink 52, the power conversion device 10 can be downsized in the direction along the surface 55 of the heat sink.

In addition, you may change embodiment as follows.
The resin portion 70 may not be interposed between the electrode members 81, 82, 83, 84 and the heat sink 52. In this case, air and the insulating layer 51 are interposed between the electrode members 81, 82, 83, 84 and the heat sink 52.

  Each electrode member 81, 82, 83, 84 may not be provided. In this case, a part of each bus bar 61, 62, 63, 64 is exposed from the resin part 70, and the exposed part and the semiconductor layer 54 are connected by the bonding wire 86.

  The bus bar module 60 may be arranged so that the surface in the thickness direction faces the surface 55 of the heat sink 52. That is, the bus bar module 60 may be arranged so that the bus bars 61, 62, 63, 64 are parallel to the surface 55 of the heat sink 52.

The power conversion device 10 may not include the heat sink 52.
As the switching elements Q1 to Q6, switching elements other than MOSFETs such as IGBT (Insulated Gate Bipolar Transistor) may be used.

Each electrode member 81, 82, 83, 84 may be extended to the semiconductor layer 54, and each electrode member 81, 82, 83, 84 and the semiconductor layer 54 may be joined.
The configuration of the AC filter 20, the PFC 25, the DC / DC converter 30, and the DC filter 40 may be changed as appropriate.

Each bus bar 61, 62, 63, 64 only needs to be at least partially opposed.
The resin portion 70 may be interposed between the bus bars 61, 62, 63, 64, and the bus bars 61, 62, 63, 64 may be modularized, and covers the entire bus bars 61, 62, 63, 64. It does not have to be.

  C2: smoothing capacitor (circuit element constituting the secondary circuit), D3, D4 ... diode (circuit element constituting the primary circuit), D5, D6, D7, D8 ... diode (constituting the secondary circuit) Circuit element), E1... Primary side circuit, E2... Secondary side circuit, Q3, Q4, Q5, Q6... Switching element (circuit element constituting the primary side circuit), 10. DC converter, 32 ... transformer, 51 ... insulating layer, 52 ... heat sink, 60 ... bus bar module, 61 ... primary positive bus bar, 62 ... primary negative bus bar, 63 ... secondary positive bus bar, 64 ... secondary side Negative electrode bus bar, 70 ... resin part, 81 ... primary side positive electrode member, 82 ... primary side negative electrode member, 83 ... secondary side positive electrode member, 84 ... secondary side negative electrode member.

Claims (3)

A power conversion device including an insulated DC / DC converter,
The DC / DC converter is
With a transformer,
A primary side circuit of the transformer;
A secondary side circuit of the transformer,
The primary circuit includes a primary positive bus bar and a primary negative bus bar to which a primary voltage is applied,
The secondary circuit includes a secondary positive bus bar and a secondary negative bus bar to which a secondary voltage is applied,
A power converter comprising a bus bar module in which each bus bar is laminated via a resin portion in the order of the primary positive bus bar, the primary negative bus bar, the secondary negative bus bar, and the secondary positive bus bar. A heat sink to which the bus bar module is bonded via an insulating layer;
The power converter according to claim 1, wherein each of the bus bars is disposed perpendicular to a surface of the heat sink on which the insulating layer is provided. Each bus bar is embedded in the resin part,
The bus bar module
A primary-side positive electrode member extending from the primary-side positive bus bar to the outside of the resin portion;
A primary negative electrode member extending from the primary negative bus bar to the outside of the resin portion;
A secondary-side positive electrode member extending from the secondary-side positive bus bar to the outside of the resin portion;
A secondary negative electrode member extending from the secondary negative bus bar to the outside of the resin part,
The primary side positive electrode member and the primary side negative electrode member are connected to circuit elements constituting the primary side circuit,
The secondary-side positive electrode member and the secondary-side negative electrode member are connected to circuit elements constituting the secondary-side circuit,
The power conversion device according to claim 2, wherein each electrode member faces the heat sink via the resin portion and the insulating layer.