JP2012105373A - Power converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power converter capable of eliminating the need of prolonging a connection member or increasing the number of connection members when connecting primary side and secondary side capacitors to a circuit, improving space efficiency, reducing power loss, and reducing the number of components.SOLUTION: A power control unit includes a primary side capacitor 42 and a secondary side capacitor 43. Then, external connection terminals of a pair of conductor plates of the secondary side capacitor include: a secondary side capacitor positive electrode terminal 50a and a secondary side capacitor negative electrode terminal 51a arranged on one side of an opening and respectively connected with the transistor of a power module; the other secondary side capacitor positive electrode terminal and the other secondary side capacitor negative electrode terminal respectively connected with the transistor of the power module; and a secondary side capacitor intermediate part negative electrode terminal arranged between the secondary side capacitor negative electrode terminal and the other secondary side capacitor negative electrode terminal of a negative electrode conductor plate and connected with the primary side capacitor negative electrode terminal 47b of the primary side capacitor.

Description

  The present invention relates to a power conversion device, and more particularly to a power conversion device used for a vehicle including an electric motor such as an electric vehicle or a hybrid vehicle.

  Conventionally, in a power conversion device for a vehicle that uses a battery, a motor, or the like, such as an electric vehicle, a hybrid vehicle, or a fuel cell vehicle, a plurality of capacitors are used, and a primary side capacitor connected in parallel to the battery and And a secondary-side capacitor connected to the input side of the inverter are disclosed (for example, see Patent Document 1).

  In addition, since such primary and secondary capacitors have a large capacity, a case mold type capacitor in which a plurality of capacitor cells are arranged in parallel, each electrode is connected by a bus bar (conductor plate), and resin molding is devised. (For example, refer to Patent Document 2).

JP 2010-119175 A JP 2008-258405 A

  By the way, when connecting the above-mentioned primary side and secondary side capacitors to the circuit, since each capacitor is large, it is necessary to lengthen the connection members such as bus bars or increase the number of connection members, It becomes a factor of a decrease in space efficiency, power loss, and an increase in the number of parts. Patent Documents 1 and 2 do not describe a specific arrangement when each capacitor is connected to a circuit.

  The present invention has been made in view of the above-described problems. The purpose of the present invention is to lengthen the connection member or increase the number of connection members when connecting the primary side and secondary side capacitors to the circuit. An object of the present invention is to provide a power conversion device that is unnecessary, has a high space efficiency, has a small power loss, and can reduce the number of components.

In order to achieve the above object, the invention according to claim 1
A primary side capacitor (for example, a primary side capacitor 42 in an embodiment described later);
A plurality of capacitor cells (for example, a capacitor cell 43a in an embodiment described later) each having an electrode on at least one end face in a predetermined direction (for example, the vertical direction in the embodiment described later), A pair of conductor plates (for example, a positive electrode conductor plate 50 and a negative electrode conductor plate 51 in an embodiment described later) connecting the respective electrodes of the plurality of capacitor cells, and a concave shape that accommodates the plurality of capacitor cells and the pair of conductor plates. In a state where the case (for example, the capacitor case 53 in the embodiment described later) and the external connection terminals of the pair of conductor plates are exposed to the outside from the opening of the case (for example, the opening 53a in the embodiment described later). A secondary-side condenser having a resin portion (for example, a potting resin 52 in an embodiment described later) covering the opening. Sa (for example, the secondary-side capacitor 43 in the embodiment to be described later),
A power converter (e.g., a converter circuit 7 in an embodiment described later),
The external connection terminal is disposed on one side of the opening and is connected to a switching element of a power module (for example, transistors S1, S2, UH, UL, VH, VL, WH, WL in the embodiments described later). First external connection terminals of positive and negative electrodes (for example, a secondary capacitor positive electrode terminal 50a and a secondary capacitor negative electrode terminal 51a in an embodiment described later), and a switching element of the power module disposed on the opposite side of the one side A second external connection terminal of positive and negative electrodes connected to each other (for example, another secondary capacitor positive electrode terminal 50b and another secondary capacitor negative electrode terminal 51b in an embodiment described later), and at least one of the conductor plates Between the first external connection terminal and the second external connection terminal, at least of the primary-side capacitor; A third external connection terminal (for example, a secondary-side capacitor intermediate negative terminal 51c in an embodiment described later) connected to the other electrode (for example, a primary capacitor negative electrode terminal 47b in an embodiment described later). It is characterized by.

In addition to the configuration of claim 1, the invention according to claim 2
In the primary capacitor, the other opening from which the electrode extends (for example, another opening 49a in the embodiment described later) is opposite to the opening of the case of the secondary capacitor in the predetermined direction. The other case (for example, the capacitor | condenser case 49 in below-mentioned embodiment) arrange | positioned so that it may face may be provided.

In addition to the structure of claim 2, the invention according to claim 3
The third external connection terminal of the one conductor plate and the electrode of the primary capacitor are connected via a terminal block (for example, a case through terminal 54 in an embodiment described later) provided on the side of the case. And
The third external connection terminal is connected on the case opening side of the secondary capacitor in the terminal block, and the electrode of the primary capacitor is connected on the case bottom side of the secondary capacitor in the terminal block. It is characterized by that.

In addition to the structure of any one of claims 1 to 3, the invention according to claim 4
The third external connection terminal of the one conductor plate is disposed in an intermediate portion of the one conductor plate.

  According to the invention of claim 1, a bus bar for connecting the electrode of the primary capacitor and the third external connection terminal of the secondary capacitor is not required separately, space efficiency is good, power loss is reduced, and It is possible to reduce the number of parts.

  According to invention of Claim 2, it can contribute to the compact design of a power converter device.

  According to the invention of claim 3, it is possible to easily connect the electrode of the primary capacitor and the third external connection terminal of the secondary capacitor.

  According to invention of Claim 4, an electric current can be sent equally to the 1st and 2nd external connection terminal connected with the switching element of a power module, and the local heat_generation | fever of a bus bar can be suppressed.

It is a circuit diagram containing the power control unit provided with the power converter device which concerns on one Embodiment of this invention. It is a perspective view which shows the hardware constitutions of a power control unit. It is a disassembled perspective view which shows the hardware constitutions of a power control unit. It is the back view which looked at the reactor arrange | positioned in the recessed part of a water jacket, the primary side, and the secondary side capacitor | condenser from the downward direction. It is sectional drawing along the VV line of FIG. It is the perspective view which looked at the reactor, the primary side, and the secondary side capacitor | condenser from diagonally downward. It is the perspective view which looked at the reactor, the primary side, and the secondary side capacitor | condenser from diagonally upward. It is a figure which shows a power module typically. (A) is a schematic diagram which shows the flow of an electric current at the time of arrange | positioning a secondary side capacitor | condenser intermediate | middle part negative electrode terminal in the intermediate part of a negative electrode conductor plate, (b) is a negative electrode of a secondary side capacitor | condenser intermediate part negative electrode. It is a schematic diagram which shows the flow of the electric current at the time of arrange | positioning in the intermediate part of a conductor board.

  Hereinafter, a power control unit including a power conversion device according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the drawing, Fr is the front, Re is the rear, L is the left, R is the right, U is the upper side, and D is the lower side.

  FIG. 1 shows a circuit configuration including a power control unit (PCU) 1 for a hybrid vehicle. This hybrid vehicle includes an engine (not shown), a generator (GEN) 2 as a second electric motor driven by the mechanical output of the engine, and a DC power source charged by the power generation output of the generator 2 A high-voltage battery (BAT) 3, a motor (MOT) 4 as a first electric motor that drives a drive wheel (not shown) using at least one of a discharge output of the battery 3 and a power generation output of the generator 2; It is equipped with.

The power control unit 1 is connected between a converter circuit 7 as a power converter of the present invention that boosts the voltage supplied from the battery 3 or steps down the voltage supplied to the battery 3, and between the converter circuit 7 and the motor 4. The first inverter circuit (Tr / MPDU) 5 that converts the DC voltage into the AC voltage or the AC voltage into the DC voltage, and the converter circuit 7 and the generator 2 are connected to convert the DC voltage into the AC voltage. Alternatively, a second inverter circuit (GENPDU) 6 that converts an AC voltage into a DC voltage is provided. The power control unit 1 boosts the DC voltage supplied from the battery 3 and then converts it to an AC voltage. When the power control unit 1 drives the motor 4 by supplying this voltage to the motor 4, the motor 4 is regenerated. Is converted into a direct current voltage, and further stepped down and supplied to the battery 3. Further, the power control unit 1 converts the voltage generated by the generator 2 into a DC voltage, and then steps down the voltage and supplies it to the battery 3 or drives the motor 4 with the voltage generated by the generator 2.
The converter circuit 7, the first inverter circuit 5, and the second inverter circuit 6 are driven and controlled through a gate drive substrate (GDCB) 9 as a drive circuit according to a control command from a control device (ECU) 8.

  The first inverter circuit 5 is, for example, a PWM inverter by pulse width modulation (PWM) including a bridge circuit formed by bridge connection using a plurality of transistors (for example, IGBT: Insulated Gate Bipolar Transistor) as switching elements, The first inverter circuit 5 is connected to the converter circuit 7 and is connected to the U-phase, V-phase, and W-phase coils of the motor 4.

  The converter circuit 7 is provided with a reactor 41 and a chopper circuit 66 composed of two transistors (for example, IGBT: Insulated Gate Bipolar Transistor) as a switching element, and the input side of the first inverter circuit 5 and a chopper circuit. A secondary-side smoothing capacitor 43 is connected in parallel to the downstream side of 66, and a primary-side smoothing capacitor 42 is connected in parallel to the upstream side of the reactor 41.

  Between the converter circuit 7 and the first inverter circuit 5, a second inverter circuit 6 having a configuration similar to that of the first inverter circuit 5 is connected to the positive terminal Pt and the negative terminal Nt. This second inverter circuit 6, the U-phase, V-phase, and W-phase coils of the generator 2 are connected. Similar to the first inverter circuit 5, the second inverter circuit 6 is a PWM inverter by pulse width modulation (PWM) having a bridge circuit formed by a bridge connection using a plurality of transistors as switching elements. A generator 2 and a converter circuit 7 are connected to the 2 inverter circuit 6.

  The first inverter circuit 5 and the second inverter circuit 6 include a high side, a low side U phase transistor UH, UL and a high side, a low side V phase transistor VH, VL and a high side, a low side W, which are paired for each phase. A bridge circuit formed by bridge-connecting phase transistors WH and WL is provided. The transistors UH, VH, and WH are connected to the positive terminal Pt of the converter circuit 7 to form a high side arm, and the transistors UL, VL, and WL are connected to the negative terminal Nt of the converter circuit 7 to form a low side arm. The transistors UH, UL and VH, VL and WH, WL that make a pair for each phase are connected in series to the converter circuit 7. Diodes DUH, DUL, DVH, DVL, DWH, and DWL are connected between the collectors and emitters of the transistors UH, UL, VH, VL, WH, and WL, respectively, in a forward direction from the emitter to the collector. ing.

  The reactor 41 of the converter circuit 7 has one end connected to the battery 3 and applied with a battery voltage, and the chopper circuit 66 has first and second transistors S1 and S2 connected to the other end of the reactor 41. It is composed of Diodes DS1 and DS2 are connected between the collectors and emitters of the transistors S1 and S2, respectively, so as to be in the forward direction from the emitter to the collector.

  One end of the reactor 41 is connected to the positive terminal of the battery 3, and the other end of the reactor 41 is connected to the collector of the first transistor S1 and the emitter of the second transistor S2. The emitter of the first transistor S1 is connected to the negative terminal of the battery 3 and the negative terminal Nt of the converter circuit 7. The collector of the second transistor S2 is connected to the positive terminal Pt of the converter circuit 7.

  Further, a signal line from the gate drive substrate 9 is connected to the gates of the transistors S1, S2, UH, UL, VH, VL, WH, WL of the first inverter circuit 5, the second inverter circuit 6, and the converter circuit 7. Yes.

  2 to 8 show the hardware configuration of the power control unit 1. The power control unit 1 is mounted in an engine room of a hybrid vehicle, for example, and includes a water jacket 10 that forms a cooling flow path 20 (see FIG. 3), and a lower case 11 that is bolted to a lower portion of the water jacket 10. And an upper case 12 that is bolted to the upper part of the water jacket 10 and an upper cover 13 that is bolted to the upper part of the upper case 12.

  As shown in FIG. 3, a reactor 41, primary and secondary side capacitors 42 and 43, a battery are disposed in a first space 14 defined by the water jacket 10 and the lower case 11 below the water jacket 10 in the direction of gravity. 3, and a current sensor 45 that sends a detection signal of the current supplied from the battery 3 to the control device 8 are accommodated. Further, in the second space 15 defined by the water jacket 10, the upper case 12, and the upper cover 13 above the water jacket 10 in the direction of gravity, the inverter circuits 5 and 6 and a part of the converter circuit 7 are respectively configured. A power module 60 including a plurality of transistors (switching elements) S1, S2, UH, UL, VH, VL, WH, WL, and transistors S1, S2, UH, UL, VH, VL, WH, Gate drive board 9 for driving WL, control device 8 for sending a control command to gate drive board 9, connection connector 71 connected to motor 4, connection connector 72 connected to generator 2, power module 60 and each connection connector 71, 72 to each bus plate component 73, 74 Current sensors 75, 76 for sending a detection signal of the current to the control unit 8 is accommodated that.

  The water jacket 10 is made of aluminum and has a substantially concave downward rectangular shape. The inflow port 21 and the outflow port 22 are provided on the same side of the short side, and a device such as a pump of a cooling device (not shown). Connected to A base frame 61 made of aluminum die cast is attached as a lid member to the upper surface of the water jacket 10 via a seal member (not shown), thereby constituting the cooling flow path 20. Further, fins 63 of the heat sink 62 are attached to the lower surface of the base frame 61 (see FIG. 5), and the base frame 61 is bolted to the water jacket 10 so that the heat sink 62 is placed in the cooling channel 20. Is housed in. Further, an air vent pipe 27 to which a tank (not shown) is attached is connected to the end of the cooling channel 20 opposite to the inlet 21 (see FIG. 4).

  Moreover, the bus bar 67 connected to the reactor 41, the secondary side capacitor positive terminals 50a and 50b of the secondary side capacitor 43, and the secondary side are provided at both longitudinal ends, which do not constitute the cooling flow path 20 of the water jacket 10. Window portions 28 and 29 from which the capacitor negative terminals 51a and 51b are drawn are formed. The base frame 61 also has window holes 64 and 65 (see FIG. 8) corresponding to the first and second window portions 28 and 29, respectively.

  As shown in FIG. 4, the reactor 41, the primary side and secondary side capacitors 42, 43, the connection connector 44, and the current sensor 45 arranged in the first space 14 are all formed on the back side of the water jacket 10. The recessed portion 30 is bolted.

  The reactor 41 and the primary side capacitor 42 are arranged side by side in the longitudinal direction of the water jacket 10 at the left portion of the recess 30, and the reactor 41 is fixed to the lower surface of the water jacket 10 near the inlet 21 of the cooling channel 20. Is done. Further, the water jacket 10 is formed with a connector attachment portion 31 formed by projecting the left side of the long side to the left, and the connection connector 44 is attached to the connector attachment portion 31. On the other hand, the secondary side capacitor 43 is attached to the right side portion of the recess 30 along the inner surface of the long side right side surface.

  As shown in FIG. 6, the primary capacitor 42 includes a pair of capacitor cells 42 a and is accommodated in a concave capacitor case (another concave case) 49. The primary side capacitor 42 is disposed with the opening (other opening) 49 a of the capacitor case 49 facing downward and the bottom close to the upper surface of the water jacket 10. The primary side capacitor 42 has a positive electrode side of each capacitor cell 42 a connected to the positive electrode conductor plate 46 on the bottom side of the capacitor case 49 and a negative electrode side connected to the negative electrode conductor plate 47 on the opening side of the capacitor case 49. 49 is covered with a potting resin 48. The positive conductor plate 46 is provided with a primary capacitor positive terminal 46a extending from the opening 49a. The negative conductor plate 47 has two primary capacitor negative terminals 47a and 47b extending from the opening 49a. Is provided.

  The capacitor cell 42a and the capacitor cell 43a described later are, for example, metallized film capacitors, and a pair of metallized films in which metal vapor-deposited electrodes are formed on one or both sides of a dielectric film made of polypropylene are used. A pair of extraction electrodes of a positive electrode and a negative electrode are respectively provided by winding metallicon electrodes which are wound in a state facing each other through a dielectric film and sprayed with zinc on both end faces.

  As shown in FIGS. 6 and 7, the secondary capacitor 43 includes a plurality of capacitor cells 43 a arranged in a straight line and is accommodated in a concave capacitor case 53. The secondary side capacitor 43 is arranged with the opening 53 a of the capacitor case 53 facing upward, that is, the opening 53 a of the capacitor case 53 of the secondary side capacitor 43 and the capacitor case 49 of the primary side capacitor 42. The other opening 49a is arranged toward the opposite side in the vertical direction. Further, the secondary side capacitor 43 has a positive electrode side of each capacitor cell 43a connected to the positive electrode conductor plate 50 on the bottom surface side of the capacitor case 53, and a negative electrode side connected to the negative electrode conductor plate 51 on the opening side of the capacitor case. The opening 53 is covered with a potting resin 52. Accordingly, the capacitor cells 43a of the secondary side capacitor 43 are electrically connected in parallel, and the negative electrode conductor plate 51 has a secondary side capacitor negative electrode terminal 51a on one side in the longitudinal direction of the opening 53a. The other secondary-side capacitor negative electrode terminal 51b is provided on the opposite side so as to extend toward the power module 60, and the secondary-side capacitor intermediate-port negative terminal 51c is provided on the intermediate portion so as to extend from the opening 53a. The positive electrode conductor plate 50 has a secondary capacitor positive electrode terminal 50a on one side in the longitudinal direction of the opening 53a, and another secondary capacitor positive electrode terminal 50b on the opposite side of the one side in the longitudinal direction. And extended.

  The positive bus bar 56 connected to the positive terminal 44 a of the connection connector 44 is connected to one terminal 41 a of the reactor 41 together with the primary side capacitor positive terminal 46 a of the primary capacitor 42, and is connected to the negative terminal 44 b of the connection connector 44. The negative electrode bus bar 57 is connected to the primary side capacitor negative electrode terminal 47 a of the primary side capacitor 42. The current sensor 45 is connected to either the positive bus bar 56 or the negative bus bar 57.

  As shown in FIG. 5, the capacitor case 53 of the secondary capacitor 43 accommodates a case through terminal 54 in which the secondary capacitor intermediate negative electrode terminal 51c and one end of the case opening are in contact with each other. The other end of the through terminal 54 on the case bottom side is fastened with a bolt 90 in a state where the other end of the through terminal 54 is in contact with the primary capacitor negative electrode terminal 47b. Accordingly, the primary side capacitor negative electrode terminal 47 b of the primary side capacitor 42 is connected to the secondary side capacitor intermediate portion negative electrode terminal 51 c of the secondary side capacitor 43.

  Further, in the recess 30 of the water jacket 10, a noise absorbing capacitor (a capacitor for connecting between the secondary capacitor positive terminal 50 c of the secondary capacitor 43 and the primary capacitor negative terminal 47 b of the primary capacitor 42 ( Y capacitor) 58 is fastened with bolts through other case through terminals 59. A discharge resistor 91 is disposed in the recess 30 of the water jacket 10 by connecting both terminals of the noise absorbing capacitor 58.

  Then, one end 67a of the bus bar 67 is connected to the other terminal 41b of the reactor 41, bent and penetrates through the second window 29 of the water jacket 10 and the second window hole 65 of the base frame 61, The other end 67 b of the bus bar 67 extends into the second space 15 so as to be connected to one end of the power module 60. Further, the second window 29 and the base frame 61 are connected so that the secondary capacitor positive terminal 50 a and the secondary capacitor negative terminal 51 a of the secondary capacitor 43 are connected to one end of the power module 60. It extends through the second window hole 65 to the second space 15. Further, the first window portion 28 is arranged such that the other secondary side capacitor positive terminal 50 b and the other secondary side capacitor negative terminal 51 b of the secondary side capacitor 43 are connected to the other end side of the power module 60. And extends through the first window hole 64 of the base frame 61 into the second space 15.

  As schematically shown in FIG. 8, the transistors S1 and S2 of the converter circuit 7, the transistors UH, UL, VH, VL, WH, WL of the first inverter circuit 5, and the transistors UH, UL of the second inverter circuit 6 , VH, VL, WH, WL are fixed to the upper surface of the water jacket 10 by fastening the resin part 55 provided around these to the base frame 61. A plurality of conductor plates (not shown) of the power module 60 connecting these transistors S1, S2, UH, UL, VH, VL, WH, WL are connected to the other end 67b of the bus bar 67 extending from the reactor 41, the secondary The secondary capacitor positive terminal 50a and the secondary capacitor negative terminal 51a of the side capacitor 43, and the other secondary capacitor positive terminal 50b and the other secondary capacitor negative terminal 51b are connected.

  Specifically, the other end 67b of the bus bar 67 is connected to a bus terminal 60a of a conductor plate that is electrically connected to the collector of one transistor S1 and the emitter of the other transistor S2 constituting the converter circuit 7. Further, the secondary capacitor positive terminal 50a of the secondary capacitor 43 located on both sides in the longitudinal direction and the other secondary capacitor positive terminal 50b are connected to the bus terminals 60b and 60c of the positive conductor plate, respectively. The secondary side capacitor negative electrode terminal 51a of the secondary side capacitor 43 located at the other side and the other secondary side capacitor negative electrode terminal 51b are connected to the bus terminals 60d and 60e of the negative electrode conductor plate.

  Further, the gate drive substrate 9 is bolted to the resin portion 55 above the power module 60. Further, the upper case 12 is bolted to the upper portion of the water jacket 10 via the base frame 61, so that the control device 8 on the upper case 12 is connected to the gate drive substrate 9 via an insulating sheet (not shown). Arranged above.

  As shown in FIG. 3, in each recess 12a, 12b extending to the side and front of the upper case 12, a connection connector 71 connected to the motor 4 and a connection connector 72 connected to the generator 2 are respectively provided. It is fixed. In the second space 15, three bus terminals 78 for the motor 4 and three bus terminals 79 for the generator 2 are arranged on the resin portion 55 on the side in the longitudinal direction of the power module 60. The three bus terminals 78 for the motor 4 and each terminal of the connection connector 71 are connected by a bus plate component 73 in which three bus bars are integrated with a resin mold, and three output terminals for the generator 2 are connected. 79 and each terminal of the connection connector 72 are connected by another bus plate component 74 in which the other three bus bars are integrated with a resin mold.

  Further, on the side of the power module 60 on the base frame 61, a current sensor 75 for the motor 4 and a current sensor 76 for the generator 2 are provided for the bus plate component 73 for the motor 4 and the generator 2. Each is connected to a bus plate component 74.

  The high-voltage harness 80 extending from the control device 8 is connected to the secondary-side capacitor positive terminal 50a of the secondary-side capacitor 43, the control device 8 and the positive bus bar 56, and the sub-harness 81 extending from the control device 8 is The current sensors 45, 75, and 76 are connected to each other.

  As described above, the power control unit 1 according to the present embodiment includes the primary capacitor 42, the plurality of capacitor cells 43a that are arranged side by side with electrodes on both end surfaces in a predetermined direction, and the plurality of capacitors. A positive electrode conductor plate 50 and a negative electrode conductor plate 51 that connect each electrode of the cell 43a, a concave capacitor case 53 that houses a plurality of capacitor cells and a pair of conductor plates 50, 51, and the outside of the pair of conductor plates 50, 51 A secondary capacitor 43 having a potting resin 52 that covers the opening 53a in a state where the connection terminal is exposed to the outside from the opening 53a of the capacitor case 53. The external connection terminals of the pair of conductor plates 50 and 51 are arranged on one side of the opening 53a and are connected to the transistors S1, S2, UH, UL, VH, VL, WH, and WL of the power module 60, respectively. The secondary capacitor positive terminal 50a, the secondary capacitor negative terminal 51a, and the opposite side of the opening 53a are connected to the transistors S1, S2, UH, UL, VH, VL, WH, WL of the power module 60, respectively. The other secondary side capacitor positive electrode terminal 50b and the other secondary side capacitor negative electrode terminal 51b are disposed between the secondary side capacitor negative electrode terminal 51a of the negative electrode conductor plate 51 and the other secondary side capacitor negative electrode terminal 51b. And a secondary side capacitor intermediate portion negative electrode terminal 51c connected to the primary side capacitor negative electrode terminal 47b of the primary side capacitor 42. . This eliminates the need for a separate bus bar for connecting the primary-side capacitor negative electrode terminal 47b of the primary-side capacitor 42 and the external connection terminal of the secondary-side capacitor 43, improves space efficiency, reduces power loss, and components. The power conversion device can reduce the number of points.

  Further, the primary side capacitor 42 is arranged so that the other opening 49a from which the primary side capacitor negative electrode terminal 47b extends is directed to the opposite side in the vertical direction to the opening 53a of the capacitor case 53 of the secondary side capacitor 43. A concave capacitor case 49 is provided. That is, the secondary side capacitor 43 is arranged with the opening 53a of the capacitor case 53 facing the water jacket 10 on which the power module 60 is placed, so that the transistors S1, S2, UH, It is not necessary to lengthen the conductor plates 50 and 51 in order to connect to UL, VH, VL, WH and WL, and the space for arranging the conductor plates 50 and 51 can be reduced. In addition, the primary side capacitor 42 is arranged with the other opening 49a of the capacitor case 49 facing downward on the opposite side of the opening 53a of the capacitor case 53 of the secondary side capacitor 43, so that it faces upward. It is not necessary to secure an insulation distance between the water jacket 60 and the terminals 46 a, 47 a, 47 b of the primary side capacitor 42 required when the primary side capacitor 42 is arranged, and the primary side capacitor 42 can be arranged close to the water jacket 60. . Therefore, the power control unit 1 can be designed compactly.

  At this time, the secondary capacitor intermediate negative electrode terminal 51 c of the negative electrode conductor plate 51 and the primary capacitor negative electrode terminal 47 b of the primary capacitor 42 are connected via a case through terminal 54 provided on the side of the capacitor case 53. Is done. Further, the secondary side capacitor intermediate negative terminal 51 c is connected on the case opening side of the case through terminal 54, and the primary side capacitor negative terminal 47 b of the primary capacitor 42 is connected on the case bottom side of the case through terminal 54. The Thereby, in the arrangement of the primary side and secondary side capacitors 42 and 43, the primary side capacitor negative electrode terminal 47b of the primary side capacitor 42 and the secondary side capacitor intermediate portion negative electrode terminal 51c of the secondary side capacitor 43 are connected to the case through terminal. 54 can be easily connected.

  Further, the secondary-side capacitor intermediate portion negative electrode terminal 51 c of the negative electrode conductor plate 51 is disposed in the intermediate portion of the negative electrode conductor plate 51. As a result, as shown in FIG. 9A, the secondary side connected to the transistors S1, S2, UH, UL, VH, VL, WH, WL of the power module 60 from the secondary side capacitor middle negative terminal 51c. The distances between the capacitor negative electrode terminal 51a and the other secondary side capacitor negative electrode terminal 51b are substantially equal, and a current is allowed to flow evenly to the secondary side capacitor negative electrode terminal 51a and the other secondary side capacitor negative electrode terminal 51b. Can suppress local heat generation. On the other hand, as shown in FIG. 9 (b), when the secondary side capacitor intermediate negative electrode terminal 51 c of the negative electrode conductor plate 51 is disposed at the end of the negative electrode conductor plate 51, the secondary side capacitor intermediate portion negative electrode The distance from the terminal 51c to the secondary capacitor negative electrode terminal 51a and the other secondary capacitor negative electrode terminal 51b is different, the current passing through the secondary capacitor negative electrode terminal 51a closer to the distance increases, and local heat generation occurs. It may occur. In addition, the intermediate part of the negative electrode conductor plate 51 provided with the secondary side capacitor intermediate part negative terminal 51c in the present invention includes a position where the current flows almost uniformly to the extent that local heat generation can be suppressed. In the embodiment, in the negative electrode conductor plate 51 extending in the longitudinal direction above the eight capacitor cells 43a arranged in a straight line, the secondary-side capacitor intermediate negative electrode terminal 51c is provided at the position of the third capacitor cell 43a from the end. Is also included.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

  In the present embodiment, the plurality of capacitor cells of the secondary-side capacitor are arranged in parallel in a straight line, but are not limited to such an arrangement, and may be arbitrarily arranged according to the layout. . For this reason, the bus bar only needs to have a configuration in which the electrodes of the capacitor cells are connected and the first and second external connection terminals extend outward on one side and the opposite side of the opening of the case.

1 Power control unit (power converter)
2 Generator (second motor)
4 Motor (first motor)
5, 6 Inverter circuit 7 Converter circuit 8 Controller 9 Gate drive substrate (drive circuit)
DESCRIPTION OF SYMBOLS 10 Water jacket 14 1st space 15 2nd space 20 Cooling flow path 21 Inlet 22 Outlet 41 Reactor 42 Primary side capacitor | condenser 43 Secondary side capacitor | condenser 44 Connector 47b Primary side capacitor | condenser negative electrode terminal 49 Capacitor case (other concave case) )
49a Other opening 50a Secondary side capacitor positive terminal (first external connection terminal)
50b Other secondary capacitor positive terminal (second external connection terminal)
51a Secondary capacitor negative electrode terminal (first external connection terminal)
51b Other secondary capacitor negative electrode terminal (second external connection terminal)
51c Secondary side capacitor middle negative terminal (third external connection terminal)
52 Potting resin (resin part)
53 Capacitor case (concave case)
53a Opening 54 Case through terminal (terminal block)
60 Power modules S1, S2, UH, UL, VH, VL, WH, WL Transistors (switching elements)

Claims (4)

A primary capacitor;
A plurality of capacitor cells each having an electrode on at least one end face in a predetermined direction and arranged side by side, a pair of conductor plates respectively connecting the electrodes of the plurality of capacitor cells, the plurality of capacitor cells, and the pair of capacitors A concave case that accommodates the conductive plate, and a secondary capacitor having a resin portion that covers the opening in a state where the external connection terminals of the pair of conductive plates extend from the opening of the case,
A power conversion device comprising:
The external connection terminal is disposed on one side of the opening, and is connected to a positive and negative first external connection terminal respectively connected to the switching element of the power module, and is disposed on the opposite side of the one side, and the switching element of the power module And at least one of the primary-side capacitors disposed between the first external connection terminal and the second external connection terminal of at least one of the conductor plates; And a third external connection terminal connected to the electrode.   The primary capacitor includes a concave other case in which the other opening from which the electrode extends is arranged so as to face the opposite side of the opening of the case of the secondary capacitor in the predetermined direction. The power conversion apparatus according to claim 1. The third external connection terminal of the one conductor plate and the electrode of the primary capacitor are connected via a terminal block provided on the side of the case,
The third external connection terminal is connected on the case opening side of the secondary capacitor in the terminal block, and the electrode of the primary capacitor is connected on the case bottom side of the secondary capacitor in the terminal block. The power conversion device according to claim 2, wherein: 4. The power conversion device according to claim 1, wherein the third external connection terminal of the one conductor plate is disposed in an intermediate portion of the one conductor plate. 5.

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