JP2012105369A - Power control unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power control unit that can efficiently optimize the arrangement of each component of a converter circuit and cool a reactor.SOLUTION: In a power control unit, a reactor 41, primary and secondary capacitors 42, 43 and a connecting connector 44 are arranged in a first space 14 defined gravitationally under a water jacket 10, while a power module 60 and a gate drive board 9 are arranged in a second space 15 defined gravitationally upward. The reactor is fixed to a lower surface of the water jacket, and the power module is fixed to an upper surface of the water jacket. In the first space, the reactor 41 and the primary capacitor 42 are juxtaposed, and the connecting connector 44 and the secondary capacitor 43 are arranged in respective regions formed opposite to the reactor and the primary capacitor in a perpendicular direction.

Description

  The present invention relates to a power control unit, and more particularly to a power control unit used in a vehicle including an electric motor such as an electric vehicle or a hybrid vehicle.

  Conventionally, in the power conversion device described in Patent Document 1, a capacitor, a water jacket, a power module constituting an inverter circuit, a gate drive substrate, and a control device (ECU) are arranged in this order from the bottom, respectively. It is described that the power module, the capacitor, and the wiring board are cooled by the cooling water flowing inside.

JP 2010-35347 A

  By the way, in a vehicle equipped with an electric motor, a booster circuit (converter circuit) that raises the voltage is provided without installing many batteries, and a voltage higher than the battery voltage is output to improve the efficiency of the motor or It is desirable to generate torque. However, in the power conversion device described in Patent Document 1, there is no description about the converter circuit, and the problem when the converter circuit is arranged is not considered.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to efficiently optimize the arrangement of each component when the converter circuit is arranged and cool the reactor that constitutes the converter circuit. It is to provide a power control unit that can be used.

In order to achieve the above object, the invention according to claim 1
A water jacket (for example, a water jacket 10 in an embodiment described later) constituting a cooling channel (for example, a cooling channel 20 in an embodiment described later);
A reactor (for example, a reactor 41 in an embodiment described later) constituting a part of a converter circuit (for example, a converter circuit 7 in an embodiment described later);
Primary side and secondary side capacitors (for example, a primary side capacitor 42 and a secondary side capacitor 43 in embodiments described later),
Inverter circuits (for example, inverter circuits 5 and 6 in the embodiments described later) and a plurality of switching elements (for example, transistors S1, S2, UH, UL, VH, and the like in the embodiments described later), respectively. VL, WH, WL) with a built-in power module (for example, a power module 60 in an embodiment described later),
A drive circuit for driving the switching element of the power module (for example, a gate drive substrate 9 in an embodiment described later);
A connection connector (for example, a connection connector 44 in an embodiment described later) connected to a DC power source;
A power control unit (for example, a power control unit 1 in an embodiment described later),
The reactor, the primary side and secondary side capacitors, and the connection connector are disposed in a first space (for example, a first space 14 in an embodiment described later) provided below the water jacket in the direction of gravity.
The power module and the drive circuit are arranged in a second space (for example, a second space 15 in an embodiment described later) provided above the water jacket in the gravitational direction.
The reactor is fixed to the lower surface of the water jacket, and the power module is fixed to the upper surface of the water jacket,
In the first space, the reactor and the primary side capacitor are arranged side by side in a predetermined direction (for example, the longitudinal direction of the water jacket 10 in an embodiment described later), and the connection connector and the secondary side capacitor Are arranged in respective regions (for example, regions B and C in the embodiments described later) formed on opposite sides of the reactor and the primary capacitor in a direction orthogonal to the predetermined direction. It is characterized by that.

In addition to the configuration of claim 1, the invention according to claim 2
The secondary-side capacitor includes a secondary-side capacitor positive terminal (for example, a secondary-side capacitor positive terminal 50a in an embodiment described later) and a secondary-side capacitor negative terminal (for example, in an embodiment described later) provided on one end side. Secondary capacitor negative electrode terminal 51a), and a secondary capacitor intermediate negative electrode terminal provided in the intermediate part (for example, secondary capacitor intermediate negative electrode terminal 51c in the embodiment described later),
The secondary side capacitor middle negative electrode terminal of the secondary side capacitor is connected to the primary side capacitor negative electrode terminal of the primary side capacitor (for example, a primary side capacitor negative electrode terminal 47b in an embodiment described later),
The secondary side capacitor positive terminal and the secondary side capacitor negative terminal of the secondary side capacitor are connected to one end side of the power module.

In addition to the structure of claim 2, the invention according to claim 3
The secondary-side capacitor includes another secondary-side capacitor positive terminal (for example, another secondary-side capacitor positive terminal 50b in an embodiment described later) and another secondary-side capacitor negative terminal ( For example, provided with another secondary side capacitor negative electrode terminal 51b) in the embodiment described later,
The other secondary side capacitor positive electrode terminal and the other secondary side capacitor negative electrode terminal of the secondary side capacitor are connected to the other end side of the power module.

The invention according to claim 4 includes, in addition to the structure according to any one of claims 1 to 3,
The water jacket is provided with an inlet (for example, an inlet 21 in an embodiment described later) and an outlet (for example, an outlet 22 in an embodiment described later) of the cooling channel,
The reactor is fixed to the lower surface of the water jacket near the inlet of the cooling channel.

The invention according to claim 5 includes, in addition to the structure according to any one of claims 1 to 4,
The inverter circuit includes a first inverter circuit connected to a first electric motor that drives a wheel (for example, a motor 4 in an embodiment described later) and a second electric motor driven by an engine (for example, an embodiment described later). A second inverter circuit connected to the generator 2) in
The power module performs switching of the converter circuit from the upstream side to the downstream side of a cooling channel (for example, a wide channel 25 in an embodiment described later) located below the power module in the water jacket. An element, a switching element of the first inverter circuit, and a switching element of the second inverter circuit are arranged in this order.

In addition to the structure of any one of claims 1 to 5, the invention according to claim 6
It is further characterized by further comprising a current sensor (for example, current sensors 75 and 76 in the embodiments described later) disposed in the second space on the side of the power module.

The invention according to claim 7 includes, in addition to the structure according to any one of claims 1 to 6,
The apparatus further includes a control device (for example, a control device 8 in an embodiment described later) disposed in the second space.

According to the invention of claim 1, since the heavy objects such as the reactor, the primary side and the secondary side capacitor are arranged below the water jacket and the power module and the drive circuit are arranged above the water jacket, each component can be stably provided. While being able to arrange | position in a unit, since the reactor and the power module are being fixed by the lower surface and upper surface of the water jacket, these components can be cooled with a common water jacket.
In addition, since the connection connector from the DC power source to the power module are arranged close to each other along the circuit configuration, each connection wiring can be shortened, loss can be suppressed, and the size and weight can be reduced.
Further, the switching elements constituting the converter circuit and the inverter circuit are housed on one substrate in the power module, so that the configuration can be simplified and the connection wiring can be shortened.

  According to the second aspect of the present invention, it is not necessary to connect the negative side of the primary side capacitor to the power module above the water jacket by connecting the negative side of the primary side capacitor to the intermediate portion of the secondary side capacitor. The wiring in the height direction can be reduced, the connection wiring can be simplified, and the flexibility of layout can be improved.

  According to the invention of claim 3, the capacity of the secondary side capacitor can be used without unevenness, and the life of the part as the whole secondary side capacitor can be extended.

  According to invention of Claim 4, it can cool efficiently by arrange | positioning a reactor to the upstream of a cooling flow path.

  According to the invention of claim 5, the converter circuit that is always driven is preferentially cooled, and the motor inverter circuit for moving the vehicle and the inverter circuit for the generator are arranged on the cooling flow path in this order, thereby further improving the efficiency. Can be cooled.

  According to the sixth aspect of the present invention, by providing the current sensor inside, it is possible to block external influences acting on the current sensor and further reduce the loss by arranging the current sensor close to the power module.

  According to the seventh aspect of the present invention, the connection wiring can be shortened by arranging the control device close to the power module and the drive circuit.

It is a circuit diagram containing the power control unit 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. (A) is a front view of a water jacket, (b) is a back view of a base frame. 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 a top view which shows the power module arrange | positioned on a base frame, a gate drive board | substrate, and a current sensor. It is sectional drawing along the VII-VII 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.

  Hereinafter, a power control unit according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the figure, Fr indicates the front, Re indicates the rear, L indicates the left side, and R indicates the right 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 the converter circuit 7 that boosts the voltage supplied from the battery 3 or the voltage that is supplied to the battery 3, and is connected between the converter circuit 7 and the motor 4. Alternatively, the first inverter circuit (Tr / MPDU) 5 that converts AC voltage into DC voltage is connected between the converter circuit 7 and the generator 2, and the DC voltage is converted to AC voltage or the AC voltage is converted to DC voltage. And a second inverter circuit (GENPDU) 6 for conversion into 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 includes a reactor 41 and a chopper circuit 66 composed of two transistors (for example, IGBT: Insulated Gate Bipolar Transistor) as switching elements, and is a voltage converter provided on the input side of the first inverter circuit 5. The secondary smoothing capacitor 43 is connected downstream of the chopper circuit 66, and the primary smoothing capacitor 42 is connected in parallel to the upstream 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, 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 10 show the hardware configuration of the power control unit 1. The power control unit 1 is mounted, for example, in an engine room of a hybrid vehicle, and includes a water jacket 10 that forms a cooling flow path 20 (see FIG. 4), 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.

  As shown in FIG. 4, the water jacket 10 is made of aluminum and has a substantially rectangular shape that is concave downward. The inlet 21 and the outlet 22 are provided on the same side of the short side, not shown. It is connected to equipment such as a pump of the cooling device.

  On the upper surface of the water jacket 10, a narrow channel 23 extending in the longitudinal direction of the water jacket 10 from the inlet 21 and a guide rib 24 extending in the longitudinal direction are formed on the opposite side of the narrow channel 23, A wide channel 25 connected to the outlet 22 and a connecting channel 26 connecting the narrow channel 23 and the wide channel 25 on the opposite side in the longitudinal direction from the inlet 21 and the outlet 22 are formed. Is done.

  A base frame 61 made of aluminum die cast is attached to the upper surface of the water jacket 10 via a sealing member (not shown) as a lid member, so that the narrow channel 22, the wide channel 24, and the connecting channel are connected. 25 constitutes the cooling flow path 20. Further, fins 63 of the heat sink 62 are attached to the lower surface of the base frame 61, and the heat sink 62 is accommodated in the wide flow path 25 by bolting the base frame 61 to the water jacket 10. Further, an air vent pipe 27 to which a tank (not shown) is attached is connected to the end of the narrow flow path 23 opposite to the inlet 21.

  Moreover, the bus bar 67 connected to the reactor 41, the secondary side capacitor positive terminals 50a and 60b of the secondary side capacitor 43, and the secondary side are provided at both longitudinal ends that do not constitute the cooling channel 20 of the water jacket 10. First and second window portions 28 and 29 from which the capacitor negative terminals 51a and 51b are drawn are formed. The base frame 61 also has first and second window holes 64 and 65 corresponding to the first and second window portions 28 and 29.

  As shown in FIG. 5, the reactor 41, the primary side and secondary side capacitors 42 and 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 capacitor 42 are arranged in the longitudinal direction (predetermined direction) of the water jacket 10 at the left side of the recess 30, and the reactor 41 is located near the inlet 21 of the cooling channel 20. 10 is fixed to the lower surface. 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. For this reason, the connection connector 44 and the secondary side capacitor 43 are formed in regions B, which are formed on opposite sides of the region A where the reactor 41 and the primary side capacitor 42 are arranged, in a direction orthogonal to a predetermined direction. C is arranged respectively.

  As shown in FIG. 8, the primary side capacitor 42 is composed of, for example, a plurality of capacitor cells 42a. The positive side of each capacitor cell 42a is connected to the positive conductor plate 46, the negative side is connected to the negative conductor plate 47, and potting is performed. The resin 48 accommodates the capacitor case 49. The positive electrode conductor plate 46 is provided with a primary side capacitor positive electrode terminal 46a, and the negative electrode conductor plate 47 is provided with two primary side capacitor negative electrode terminals 47a and 47b.

  As shown in FIGS. 8 and 9, the secondary side capacitor 43 is configured by a plurality of capacitor cells 43 a arranged in a straight line. The positive electrode side of each capacitor cell 43 a is connected by the positive electrode conductor plate 50, and the negative electrode side is the negative electrode They are connected by a conductor plate 51 and accommodated in a capacitor case 53 by a potting resin 52. As a result, the capacitor cells 43a of the secondary capacitor 43 are electrically connected in parallel, and the negative electrode conductor plate 51 has a secondary capacitor negative terminal 51a and another secondary capacitor negative terminal 51b at both ends in the longitudinal direction. Is provided, and a secondary-side capacitor intermediate part negative electrode terminal 51c is provided in the intermediate part. Further, the positive electrode conductor plate 50 is provided with a secondary side capacitor positive electrode terminal 50a and another secondary side capacitor positive electrode terminal 50b at both ends in the longitudinal direction.

  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. 7, the capacitor case 53 of the secondary capacitor 43 accommodates a case through terminal 54 that contacts one end of the secondary capacitor intermediate negative electrode terminal 51 c. The bolt 90 is fastened with the end 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.

  Then, one end 67a of the bus bar 67 is connected to the other terminal of the reactor 41, bent and passes through the second window 29 of the water jacket 10 and the second window hole 65 of the base frame 61, and the bus bar 67 The other end 67 b of 67 extends to 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. 10, the transistors S1, S2 of the converter circuit 7, the transistors UH, UL, VH, VL, WH, WL of the first inverter circuit 5, 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. The power module 60 is disposed to the right on the upper surface of the base frame 61 corresponding to the portion to which the heat sink 62 is attached, and is positioned above the wide flow path 25. The transistors S1, 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, VH, VL, WH, WL of the second inverter circuit 6 are They are arranged in this order from the upstream side to the downstream side of the wide path 25 in the water jacket 10. Also, the 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 side capacitor positive electrode terminal 50a and the secondary side capacitor negative electrode terminal 51a of the secondary side capacitor 43 are connected to the other secondary side capacitor positive electrode terminal 50b and the other secondary side capacitor negative electrode terminal 51b.

  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.

  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 base frame 61, between the side of the power module 60, specifically between the long side surface of the power module 60 and the inner surface of the upper case 12, the current sensor 75 for the motor 4 and the generator 2 are arranged. Current sensor 76 is connected to bus plate component 73 for motor 4 and bus plate component 74 for generator 2.

  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, according to the power control unit 1 according to the present embodiment, the reactor 41, the primary side and secondary side capacitors 42 and 43, and the connection connector 44 are provided below the water jacket 10 in the gravity direction. Arranged in the first space 14, the power module 60 and the gate drive substrate 9 are arranged in a second space 15 provided above the water jacket 10 in the direction of gravity. The reactor 41 is fixed to the lower surface of the water jacket 10, and the power module 60 is fixed to the upper surface of the water jacket 10. In the first space 14, the reactor 41 and the primary capacitor 42 are arranged in a predetermined direction. The connector 44 and the secondary capacitor 43 are disposed in the regions B and C formed on the opposite sides of the reactor 41 and the primary capacitor 42 in a direction orthogonal to a predetermined direction. Has been. As a result, the heavy components such as the reactor 41 and the primary and secondary capacitors 42 and 43 are arranged below the water jacket 10, and the power module 60 and the gate drive substrate 9 are arranged above, so that each component can be stabilized. Since the reactor 41 and the power module 60 are fixed on the lower surface and upper surface of the water jacket 10, these components can be cooled by the common water jacket 10. Further, since the connection connector 44 to the battery 3 and the power module 60 are arranged close to each other along the circuit configuration, each connection wiring can be shortened, loss can be suppressed, and the size and weight can be reduced. In addition, the switching elements S1, S2, UH, UL, VH, VL, WH, and WL constituting the converter circuit 7 and the inverter circuits 5 and 6 are housed on one substrate in the power module 60, thereby simplifying the configuration. In addition, the connection wiring can be shortened.

  The secondary capacitor 43 includes a secondary capacitor positive terminal 50a and a secondary capacitor negative terminal 51a provided on one end side, and a secondary capacitor intermediate negative terminal 51c provided in the intermediate section. The secondary capacitor intermediate negative electrode terminal 51c of the secondary capacitor 43 is connected to the primary capacitor negative electrode terminal 47b of the primary capacitor 42, and the secondary capacitor positive terminal 50a of the secondary capacitor 43 The secondary side capacitor negative electrode terminal 51 a is connected to one end side of the power module 60. That is, by connecting the negative side of the primary side capacitor 42 to the intermediate part of the secondary side capacitor 43, it is not necessary to connect the negative side of the primary side capacitor 42 to the power module 60 above the water jacket 10. The wiring in the vertical direction can be reduced, the connection wiring can be simplified, and the degree of layout freedom can be improved.

  Further, the secondary side capacitor 43 includes another secondary side capacitor positive electrode terminal 50 b and another secondary side capacitor negative electrode terminal 51 b provided on the other end side, and other secondary side capacitors of the secondary side capacitor 43. The positive terminal 50 b and the other secondary capacitor negative terminal 51 b are connected to the other end of the power module 60. Thereby, the capacity | capacitance of the secondary side capacitor | condenser 43 can be used evenly, and the lifetime of components as the secondary side capacitor | condenser 43 whole can be extended.

  In addition, the water jacket 10 is provided with an inlet 21 and an outlet 22 of the cooling channel 20, and the reactor 41 is fixed to the lower surface of the water jacket 10 in the vicinity of the inlet 21 of the cooling channel 20. Therefore, the reactor 41 can be cooled efficiently.

  The inverter circuits 5 and 6 include a first inverter circuit 5 connected to the motor 4 that drives the wheels, and a second inverter circuit 5 connected to the generator 2 driven by the engine. The transistors S1, S2 of the converter circuit 7 and the transistors UH, UL, VH of the first inverter circuit 5 from the upstream side to the downstream side of the wide path 25 located below the power module 60 in the water jacket 10 , VL, WH, WL and transistors UH, UL, VH, VL, WH, WL of the second inverter circuit 6 are arranged in this order. As a result, the transistors S1 and S2 of the converter circuit 7 that is always driven are preferentially cooled, and then the transistors UH, UL, VH, VL, WH, WL of the motor inverter circuit 5 that moves the vehicle, and the inverter for the generator By arranging the transistors UH, UL, VH, VL, WH, WL in the circuit 6 in this order on the cooling flow path, cooling can be performed more efficiently.

  Further, since the current sensors 75 and 76 disposed in the second space 15 are further provided on the side of the power module 60, external influences acting on the current sensors 75 and 76 are blocked, and the current sensors 75 and 76 are further separated. The loss can be reduced by arranging the power module 60 close to the power module 60.

  Further, by including the control device 8 disposed in the second space 15, the control device 8 can be disposed close to the power module 60 and the gate drive substrate 9, and the connection wiring can be shortened.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In the above embodiment, the first and second electric motors are power units composed of a generator and a motor. However, the present invention can also be applied to a power unit composed of two motors for the first and second electric motors. is there.

1 Power control unit 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 43 Secondary side capacitor 44 Connection connector 47b Primary side capacitor negative electrode terminal 50a Secondary side capacitor positive electrode terminal 50b etc. Secondary capacitor positive terminal 51a Secondary capacitor negative terminal 51b Other secondary capacitor negative terminal 51c Secondary capacitor intermediate negative terminal 60 Power modules 75, 76 Current sensors S1, S2, UH, UL, VH, VL, WH, WL Transistor (switching element)

In order to achieve the above object, a power control unit according to claim 1 (for example, a power control unit 1 in an embodiment described later)
A water jacket (for example, a water jacket 10 in an embodiment described later) constituting a cooling channel (for example, a cooling channel 20 in an embodiment described later);
Li Akutoru (e.g., reactor 41 in the embodiment) and,
Primary side and secondary side capacitors (for example, a primary side capacitor 42 and a secondary side capacitor 43 in embodiments described later),
Multiple switching elements (e.g., transistors S1, S2, UH according to the embodiment described later, UL, VH, VL, WH, WL) and a power module having a built-in (e.g., power module 60 will be described in the exemplary embodiment),
A drive circuit for driving the switching element of the power module (for example, a gate drive substrate 9 in an embodiment described later);
A connection connector (for example, a connection connector 44 in an embodiment described later) connected to a DC power source;
Bei to give a,
The reactor, the primary side and secondary side capacitors, and the connection connector are disposed in a first space (for example, a first space 14 in an embodiment described later) provided below the water jacket in the direction of gravity.
The power module and the drive circuit are arranged in a second space (for example, a second space 15 in an embodiment described later) provided above the water jacket in the gravitational direction.
The reactor is fixed to the lower surface of the water jacket, and the power module is fixed to the upper surface of the water jacket,
In the first space, the reactor and said primary side capacitor, adjacent, and the predetermined direction (e.g., longitudinal direction of the water jacket 10 in the embodiment to be described later) while being disposed in parallel to, the connector and the secondary-side capacitor and is, in the direction perpendicular to the predetermined direction, characterized in that it is placed opposite to each other with respect to the reactor and the primary-side capacitor.

In addition to the structure of claim 2, the invention according to claim 3
The secondary-side capacitor includes another secondary-side capacitor positive terminal (for example, another secondary-side capacitor positive terminal 50b in an embodiment described later) and another secondary-side capacitor negative terminal ( For example, provided with another secondary side capacitor negative electrode terminal 51b) in the embodiment described later,
Before SL other secondary-side capacitor positive electrode terminal and the other secondary-side capacitor negative terminal, characterized in that it is connected to the other end of the power module.

The invention according to claim 5 includes, in addition to the structure according to any one of claims 1 to 4,
Inverter circuit comprising at least the switching element (for example, inverter circuits 5 and 6 in the embodiments described later),
The inverter circuit includes a first inverter circuit connected to a first electric motor that drives a wheel (for example, a motor 4 in an embodiment described later) and a second electric motor driven by an engine (for example, an embodiment described later). A second inverter circuit connected to the generator 2) in
The power module performs switching of the converter circuit from the upstream side to the downstream side of a cooling channel (for example, a wide channel 25 in an embodiment described later) located below the power module in the water jacket. An element, a switching element of the first inverter circuit, and a switching element of the second inverter circuit are arranged in this order.

Claims (7)

A water jacket constituting the cooling flow path;
A reactor that forms part of the converter circuit;
Primary and secondary capacitors;
A power module including a plurality of switching elements each constituting a part of the inverter circuit and the converter circuit;
A drive circuit for driving the switching element of the power module;
A connector to be connected to the DC power supply;
A power control unit comprising:
The reactor, the primary side and secondary side capacitors, and the connection connector are arranged in a first space provided below the water jacket in the direction of gravity,
The power module and the drive circuit are arranged in a second space provided above the water jacket in the gravitational direction,
The reactor is fixed to the lower surface of the water jacket, and the power module is fixed to the upper surface of the water jacket,
In the first space, the reactor and the primary capacitor are arranged side by side in a predetermined direction, and the connection connector and the secondary capacitor are in the direction orthogonal to the predetermined direction, the reactor and A power control unit, wherein the power control unit is disposed in each of regions formed on opposite sides of the primary capacitor. The secondary side capacitor includes a secondary side capacitor positive electrode terminal and a secondary side capacitor negative electrode terminal provided on one end side, and a secondary side capacitor intermediate part negative electrode terminal provided on an intermediate part,
The secondary side capacitor middle negative terminal of the secondary side capacitor is connected to the primary side capacitor negative terminal of the primary side capacitor,
2. The power control unit according to claim 1, wherein a secondary capacitor positive terminal and a secondary capacitor negative terminal of the secondary capacitor are connected to one end of the power module. The secondary side capacitor includes another secondary side capacitor positive electrode terminal and another secondary side capacitor negative electrode terminal provided on the other end side,
3. The power control according to claim 2, wherein the other secondary-side capacitor positive electrode terminal and the other secondary-side capacitor negative electrode terminal of the secondary-side capacitor are connected to the other end side of the power module. unit. The water jacket is provided with an inlet and an outlet of the cooling channel,
4. The power control unit according to claim 1, wherein the reactor is fixed to a lower surface of the water jacket in the vicinity of an inlet of the cooling channel. 5. The inverter circuit includes a first inverter circuit connected to a first electric motor that drives a wheel, and a second inverter circuit connected to a second electric motor driven by an engine,
The power module includes a switching element of the converter circuit, a switching element of the first inverter circuit, the switching element of the first inverter circuit, from the upstream side to the downstream side of a cooling channel located below the power module in the water jacket. 5. The power control unit according to claim 1, wherein the power control unit is arranged in the order of the switching elements of the two inverter circuits.   The power control unit according to any one of claims 1 to 5, further comprising a current sensor disposed in the second space on a side of the power module.   The power control unit according to any one of claims 1 to 6, further comprising a control device arranged in the second space.

Images