JP2014161227A - Power converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power converter capable of contriving effective cooling and miniaturization.SOLUTION: A power converter 200 includes: power modules 300U-300W which have built-in serial circuits 150; and a flow passage organizer 12 in the parallelepiped shape having a storage space 405 surrounded by a flow passage 19. The flow passage 19 has: a flow passage section 19a along a side face 12a of the flow passage organizer 12; a flow passage section 19b along a side face 12b; and a flow passage section 19c along a side face 12c. Then, the flat power modules 300U-300W are arranged in the flow passage sections 19b, 19a, 19c so as to become parallel with the side faces 12b, 12a, 12c in order. Thus, the planar view shape of the flow passage organizer 12 is made into approximately square, and the power converter 200 is miniaturized by arranging the power modules 300U-300W in the U-shapes so as to surround three directions of the storage space 405.

Description

  The present invention relates to a power conversion device including a three-phase inverter circuit, and more particularly to a power conversion device suitable for being mounted on a vehicle.

Patent Document 1 describes a structure in which a semiconductor module is cooled by being inserted into a refrigerant passage. In a power conversion device that controls a motor, it is desirable to cool not only the semiconductor module but also parts used in the power conversion device. However, Patent Document 1 does not mention that the electronic components used in the power converter are cooled together.
For example, an electric vehicle that travels on a vehicle by rotational torque generated by a motor, a hybrid vehicle that travels based on the output of both an engine and a motor (in this application, it can be applied to both types of vehicles; As an example of an automobile), it is desirable to cool not only the semiconductor module but also the parts used in the power conversion device more efficiently.

JP 2006-202899 A

In the power conversion device, it is desirable to cool not only the power module but also the components used in the power conversion device more efficiently.
The objective of this invention is providing the power converter device which can reduce the number of parts as the whole power converter device.

  A power converter according to the present invention includes a semiconductor module that converts a direct current into an alternating current, an alternating current bus bar that transmits the alternating current, a holding member that holds the alternating current bus bar, and a driver circuit that drives the semiconductor module. A driver circuit board, and the holding member includes a support member that supports the driver circuit board.

  ADVANTAGE OF THE INVENTION According to this invention, the number of parts of a power converter device can be reduced.

The figure which shows the control block of a hybrid vehicle. FIG. 6 illustrates a configuration of an electric circuit of an inverter circuit 140. The external appearance perspective view of the power converter device 200. FIG. The external appearance perspective view of the power converter device 200. FIG. The disassembled perspective view of the power converter device 200. FIG. The disassembled perspective view of the power converter device 200. FIG. 2 is an exploded perspective view of a power conversion device 200. FIG. The external appearance perspective view of the flow-path formation body 12 with which the power modules 300U-300W, the capacitor | condenser module 500, and the bus-bar assembly 800 were assembled | attached. The figure which shows the flow-path formation body 12 of the state which removed the bus-bar assembly 800. FIG. The perspective view of the flow-path formation body 12. FIG. The disassembled perspective view which looked at the flow-path formation body 12 from the back surface side. The figure which shows a power module. The figure which shows the power module which removed the screw and 2nd sealing resin. The figure which shows the power module which removed the case further from FIG. The perspective view of the power module which removed the 1st sealing resin and the wiring insulation part from FIG. The figure which shows an auxiliary mold body. The figure for demonstrating the assembly process of a module primary sealing body. The figure for demonstrating the assembly process of a module primary sealing body. The figure for demonstrating the assembly process of a module primary sealing body. The figure for demonstrating the assembly process of a module primary sealing body. The figure for demonstrating the assembly process of a module primary sealing body. The figure for demonstrating the transfer mold process of 1st sealing resin. The figure which shows the arrangement | positioning relationship between the control electrode of a power semiconductor element, and each terminal. The figure which shows the modification which provided the stress relaxation part in the conductor board by the side of a direct current negative electrode wiring. The figure which shows the built-in circuit structure of a power module. The figure for demonstrating the low inductance in a power module. The external appearance perspective view of the capacitor module 500. FIG. The perspective view of the bus-bar assembly 800. FIG. The figure which shows the flow-path formation body 12 with which the power modules 300U-300W and the capacitor | condenser module 500 were mounted | worn. 2 is a horizontal sectional view of a flow path forming body 12. FIG. The schematic diagram for demonstrating arrangement | positioning of the power modules 300U-300W. The figure which shows the cross section of the power converter device 200. FIG. The figure explaining the layout when the power converter device 200 is mounted in a vehicle. The figure which shows a modification. The figure which shows a modification. The figure which shows a modification. Sectional drawing of the flow-path formation body 12 which concerns on this embodiment. The figure which shows the modification at the time of dividing | segmenting DC negative electrode wiring. The figure for demonstrating the assembly process of the module primary sealing body which concerns on a modification. The figure for demonstrating the assembly process of the module primary sealing body which concerns on a modification. The figure for demonstrating the assembly process of the module primary sealing body which concerns on a modification.

In the embodiments described below, in addition to the problems and effects described in the column of problems to be solved by the above-mentioned invention and the column of effects of the invention, problems that are desired to be solved as products are solved, and effects are also achieved. I play. The typical problems and effects are described below. The rest will be described in the embodiment.
<Reduction of heat generation concentration>
In the following embodiment, the capacitor module 500 has a first channel 19a, a second channel 19b, and a third channel 19c so that the first channel 19a and the third channel 19c face each other. The power modules 300U to 300W for forming upper and lower arms for supplying each phase current of three-phase alternating current are disposed in each of the first to third flow paths. By arranging the power modules 300U to 300W corresponding to each phase in each flow path in this way, the heat generation of the power modules 300U to 300W tends to be substantially the same, and each flow of the first to third flow paths is strong. Since the heat generation of the power modules arranged in the path tends to be substantially the same, it is difficult for the heat generation to concentrate in one of the flow paths. For this reason, the heat generation around the capacitor module 500 is easily equalized, and there is an effect of suppressing the heat generation from being concentrated on one side of the capacitor module 500. Here, by configuring each power module to accommodate the series circuit of the upper and lower arms, there is an effect of reducing inductance as described below. In addition, productivity is improved. Regarding the above-described problem of suppressing the concentration of heat, the upper arm and the lower arm may be housed in different module cases and connected in series outside the module case. Although this structure requires more external wiring, the structure of each power module is simplified and the productivity of the power module is improved.
<Inductance reduction>
A cooling path is provided on the outer periphery of the capacitor module, and a series circuit of upper and lower arms is housed in a module case that is cooled by each cooling path, as described in the following embodiments, so that each of the power modules 300U to 300W is provided. Inductance can be reduced. Furthermore, by projecting the DC terminals 504 and 506 having a laminated structure for connecting to each power module from the capacitor module, there is an effect that inductance between the capacitor module 500 and each of the power modules 300U to 300W can be reduced.
<Miniaturization>
In the following embodiment, the first flow path 19a, the second flow path 19b, and the third flow path 19c are provided around the capacitor module 500 so that the second flow path 19b and the third flow path 19c are opposed to each other. The power modules constituting the upper and lower arms for supplying the three-phase alternating currents are arranged in the first to third flow paths. With such a structure, various parts to be cooled can be arranged inside the flow path, and the power module can be arranged along the flow path, so that the entire power conversion device can be reduced in size.
Moreover, it becomes possible to arrange | position a direct current and an alternating current bus bar in the space above the capacitor module 500, and the whole power converter device can be reduced in size. In addition, productivity is improved.
In the following embodiments, the AC bus bar can be handled as an assembly by the structure in which the AC bus bar is supported by the support member, and the mounting operation of the AC bus bar becomes easy and the productivity is improved.
In addition, the connection portion of the AC bus bar faces upward, which facilitates welding connection and improves productivity.
<Improving productivity>
As described above, various improvements have been made to improve productivity.
Further, since the control terminal of each power module protrudes longer than the DC terminal or the AC terminal, the connection with the driver board is facilitated, and the effect of improving productivity and miniaturization is achieved.
<Improvement of reliability>
In the following embodiment, the current sensor 180 that detects the AC output current has a problem that it is easily affected by heat, but the current sensor 180 is disposed on the projection surface of the flow path forming body 12. The temperature increase of the current sensor 180 is suppressed, and the reliability is improved.
The connection terminals 504 and 506 of the capacitor module 500 connected to the power module and the terminals 500g and 500h connected to the power source of the capacitor module are arranged at a distance from each other, and a large number of film capacitors housed inside the capacitor module 500 Since the cell has a structure in which the terminals 504 and 506 and the terminals 500g and 500h are connected in parallel, transmission of noise generated by the switching operation of the power module to the terminals 500g and 500h is transmitted. Is effective.
In the following embodiments, various problems are further solved and effective, and these will be described in the following embodiments.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a control block of a hybrid vehicle (hereinafter referred to as “HEV”). Engine EGN and motor generator MG1 generate vehicle running torque. Motor generator MG1 not only generates rotational torque but also has a function of converting mechanical energy applied from the outside to motor generator MG1 into electric power.

  The motor generator MG1 is, for example, a synchronous machine or an induction machine, and operates as a motor or a generator depending on the operation method as described above. When motor generator MG1 is mounted on an automobile, it is desirable to obtain a small and high output, and a permanent magnet type synchronous motor using a magnet such as neodymium is suitable. Further, the permanent magnet type synchronous motor generates less heat from the rotor than the induction motor, and is excellent for automobiles from this viewpoint.

  The output torque on the output side of the engine EGN is transmitted to the motor generator MG1 via the power distribution mechanism TSM, and the rotation torque from the power distribution mechanism TSM or the rotation torque generated by the motor generator MG1 is transmitted via the transmission TM and the differential gear DEF. Transmitted to the wheels. On the other hand, during regenerative braking operation, rotational torque is transmitted from the wheels to motor generator MG1, and AC power is generated based on the supplied rotational torque. The generated AC power is converted to DC power by the power conversion device 200 as described later, and the high-voltage battery 136 is charged, and the charged power is used again as travel energy.

  Next, the power conversion device 200 will be described. The inverter circuit 140 is electrically connected to the battery 136 via the DC connector 138, and power is exchanged between the battery 136 and the inverter circuit 140. When motor generator MG1 is operated as a motor, inverter circuit 140 generates AC power based on DC power supplied from battery 136 via DC connector 138 and supplies it to motor generator MG1 via AC terminal 188. . The configuration comprising motor generator MG1 and inverter circuit 140 operates as a first motor generator unit.

  In the present embodiment, the first motor generator unit is operated as the electric unit by the electric power of the battery 136, so that the vehicle can be driven only by the power of the motor generator MG1. Further, in the present embodiment, the battery 136 can be charged by operating the first motor generator unit as a power generation unit by the power of the engine 120 or the power from the wheels to generate power.

  Although omitted in FIG. 1, the battery 136 is also used as a power source for driving an auxiliary motor. The auxiliary motor is, for example, a motor for driving a compressor of an air conditioner or a motor for driving a control hydraulic pump. DC power is supplied from the battery 136 to the auxiliary power module, and the auxiliary power module generates AC power and supplies it to the auxiliary motor. The auxiliary power module has basically the same circuit configuration and function as the inverter circuit 140, and controls the phase, frequency, and power of alternating current supplied to the auxiliary motor. The power conversion device 200 includes a capacitor module 500 for smoothing the DC power supplied to the inverter circuit 140.

  The power conversion device 200 includes a communication connector 21 for receiving a command from a host control device or transmitting data representing a state to the host control device. Power conversion device 200 calculates a control amount of motor generator MG1 by control circuit 172 based on a command input from connector 21, further calculates whether to operate as a motor or a generator, and based on the calculation result. The control pulse is generated, and the control pulse is supplied to the driver circuit 174. The driver circuit 174 generates a driving pulse for controlling the inverter circuit 140 based on the supplied control pulse.

  Next, the configuration of the electric circuit of the inverter circuit 140 will be described with reference to FIG. In the following description, an insulated gate bipolar transistor is used as a semiconductor element, and hereinafter abbreviated as IGBT. The IGBT 328 and the diode 156 that operate as the upper arm, and the IGBT 330 and the diode 166 that operate as the lower arm constitute the series circuit 150 of the upper and lower arms. The inverter circuit 140 includes the series circuit 150 corresponding to three phases of the U phase, the V phase, and the W phase of the AC power to be output.

  In this embodiment, these three phases correspond to the three-phase windings of the armature winding of motor generator MG1. The series circuit 150 of the upper and lower arms of each of the three phases outputs an alternating current from the intermediate electrode 169 that is the midpoint portion of the series circuit. This intermediate electrode 169 is connected to AC bus bars 802 and 804 described below which are AC power lines to motor generator MG1 through AC terminal 159 and AC terminal 188.

  The collector electrode 153 of the IGBT 328 of the upper arm is electrically connected to the capacitor terminal 506 on the positive electrode side of the capacitor module 500 via the positive electrode terminal 157. The emitter electrode of the IGBT 330 of the lower arm is electrically connected to the capacitor terminal 504 on the negative electrode side of the capacitor module 500 via the negative electrode terminal 158.

  As described above, the control circuit 172 receives a control command from the host control device via the connector 21, and based on this, the IGBT 328 that configures the upper arm or the lower arm of each phase series circuit 150 that constitutes the inverter circuit 140. And a control pulse that is a control signal for controlling the IGBT 330 is generated and supplied to the driver circuit 174.

  Based on the control pulse, the driver circuit 174 supplies a drive pulse for controlling the IGBT 328 and IGBT 330 constituting the upper arm or the lower arm of each phase series circuit 150 to the IGBT 328 and IGBT 330 of each phase. IGBT 328 and IGBT 330 perform conduction or cutoff operation based on the drive pulse from driver circuit 174, convert DC power supplied from battery 136 into three-phase AC power, and supply the converted power to motor generator MG1. Is done.

  The IGBT 328 includes a collector electrode 153, a signal emitter electrode 155, and a gate electrode 154. The IGBT 330 includes a collector electrode 163, a signal emitter electrode 165, and a gate electrode 164. A diode 156 is electrically connected between the collector electrode 153 and the emitter electrode 155. A diode 166 is electrically connected between the collector electrode 163 and the emitter electrode 165.

  As the switching power semiconductor element, a metal oxide semiconductor field effect transistor (hereinafter abbreviated as MOSFET) may be used. In this case, the diode 156 and the diode 166 are unnecessary. As a power semiconductor element for switching, IGBT is suitable when the DC voltage is relatively high, and MOSFET is suitable when the DC voltage is relatively low.

  The capacitor module 500 includes a capacitor terminal 506 on the positive electrode side, a capacitor terminal 504 on the negative electrode side, a power supply terminal 509 on the positive electrode side, and a power supply terminal 508 on the negative electrode side. The high-voltage DC power from the battery 136 is supplied to the positive-side power terminal 509 and the negative-side power terminal 508 via the DC connector 138, and the positive-side capacitor terminal 506 and the negative-side capacitor of the capacitor module 500. The voltage is supplied from the terminal 504 to the inverter circuit 140.

  On the other hand, the DC power converted from the AC power by the inverter circuit 140 is supplied to the capacitor module 500 from the positive capacitor terminal 506 and the negative capacitor terminal 504, and is connected to the positive power terminal 509 and the negative power terminal 508. Is supplied to the battery 136 via the DC connector 138 and accumulated in the battery 136.

  The control circuit 172 includes a microcomputer (hereinafter referred to as “microcomputer”) for calculating the switching timing of the IGBT 328 and the IGBT 330. The input information to the microcomputer includes a target torque value required for the motor generator MG1, a current value supplied from the series circuit 150 to the motor generator MG1, and a magnetic pole position of the rotor of the motor generator MG1.

  The target torque value is based on a command signal output from a host controller (not shown). The current value is detected based on a detection signal from the current sensor 180. The magnetic pole position is detected based on a detection signal output from a rotating magnetic pole sensor (not shown) such as a resolver provided in the motor generator MG1. In this embodiment, the current sensor 180 detects the current value of three phases, but the current value for two phases may be detected and the current for three phases may be obtained by calculation. .

  The microcomputer in the control circuit 172 calculates the d-axis and q-axis current command values of the motor generator MG1 based on the target torque value, the calculated d-axis and q-axis current command values, and the detected d The voltage command values for the d-axis and q-axis are calculated based on the difference between the current values for the axes and q-axis, and the calculated voltage command values for the d-axis and q-axis are calculated based on the detected magnetic pole position. It is converted into voltage command values for phase, V phase, and W phase. Then, the microcomputer generates a pulse-like modulated wave based on a comparison between the fundamental wave (sine wave) and the carrier wave (triangular wave) based on the voltage command values of the U phase, V phase, and W phase, and the generated modulation wave The wave is output to the driver circuit 174 as a PWM (pulse width modulation) signal.

  When driving the lower arm, the driver circuit 174 outputs a drive signal obtained by amplifying the PWM signal to the gate electrode of the corresponding IGBT 330 of the lower arm. Further, when driving the upper arm, the driver circuit 174 amplifies the PWM signal after shifting the level of the reference potential of the PWM signal to the level of the reference potential of the upper arm, and uses this as a drive signal as a corresponding upper arm. Are output to the gate electrodes of the IGBTs 328 respectively.

  In addition, the microcomputer in the control circuit 172 detects abnormality (overcurrent, overvoltage, overtemperature, etc.) and protects the series circuit 150. For this reason, sensing information is input to the control circuit 172. For example, information on the current flowing through the emitter electrodes of the IGBTs 328 and IGBTs 330 is input to the corresponding drive units (ICs) from the signal emitter electrode 155 and the signal emitter electrode 165 of each arm. Thereby, each drive part (IC) detects an overcurrent, and when an overcurrent is detected, the switching operation of the corresponding IGBT 328 and IGBT 330 is stopped, and the corresponding IGBT 328 and IGBT 330 are protected from the overcurrent.

  Information on the temperature of the series circuit 150 is input to the microcomputer from a temperature sensor (not shown) provided in the series circuit 150. In addition, voltage information on the DC positive side of the series circuit 150 is input to the microcomputer. The microcomputer performs over-temperature detection and over-voltage detection based on the information, and stops switching operations of all the IGBTs 328 and IGBTs 330 when an over-temperature or over-voltage is detected.

  3 and 4 are external perspective views of the power conversion apparatus 200 according to the embodiment of the present invention, and FIG. 4 shows a state in which the AC connector 187 and the DC connector 138 are removed. The power conversion device 200 according to the present embodiment has an effect that the planar shape is a rectangular parallelepiped shape, which can be reduced in size and can be easily attached to the vehicle. 8 is a lid, 10 is a housing, 12 is a flow path forming body, 13 is a cooling medium inlet pipe, 14 is an outlet pipe, and 420 is a lower cover. The connector 21 is a signal connector provided for connection to the outside.

  The lid 8 is fixed to the upper opening of the housing 10 in which circuit components constituting the power conversion device 200 are accommodated. The flow path forming body 12 fixed to the lower part of the housing 10 holds a power module 300 and a capacitor module 500, which will be described later, and cools them with a cooling medium. For example, water is often used as the cooling medium, and will be described as cooling water below. The inlet pipe 13 and the outlet pipe 14 are provided on one side surface of the flow path forming body 12, and the cooling water supplied from the inlet pipe 13 flows into a flow path 19 to be described later in the flow path forming body 12 and from the outlet pipe 14. Discharged.

  An AC interface 185 to which the AC connector 187 is attached and a DC interface 137 to which the DC connector 138 is attached are provided on the side surface of the housing 10. The AC interface 185 is provided on the side surface where the pipes 13 and 14 are provided, and the AC wiring 187 a of the AC connector 187 attached to the AC interface 185 extends downward between the pipes 13 and 14. The DC interface 137 is provided on the side surface adjacent to the side surface on which the AC interface 185 is provided, and the DC wiring 138 a of the DC connector 138 attached to the DC interface 137 also extends below the power converter 200.

  In this way, the AC interface 185 and the pipes 13 and 14 are disposed on the same side surface 12d side, and the AC wiring 187a is drawn downward so as to pass between the pipes 13 and 14. The space occupied by the AC connector 187 and the AC wiring 187a can be reduced, and the overall size of the apparatus can be reduced. Further, since the AC wiring 187a is drawn downward with respect to the pipes 13 and 14, the AC wiring 187a can be easily routed and the productivity is improved.

  FIG. 5 is a diagram showing a state in which lid 8, DC interface 137, and AC interface 185 are removed from power conversion device 200 shown in FIG. An opening 10a to which the AC interface 185 is fixed is formed on one side of the housing 10, and an opening 10b to which the DC interface 137 is fixed is formed on the other adjacent side. Three AC bus bars 802, that is, a U-phase AC bus bar 802U, a V-phase AC bus bar 802V, and a W-phase AC bus bar 802W protrude from the opening 10a, and DC power supply terminals 508 and 509 protrude from the opening 10b.

  6 is a view showing a state where the housing 10 is removed from the flow path forming body 12 in FIG. The housing 10 has two storage spaces, and is divided into an upper storage space and a lower storage space by a partition wall 10c. The control circuit board 20 to which the connector 21 is fixed is stored in the upper storage space, and the driver circuit board 22 and a bus bar assembly 800 described later are stored in the lower storage space. A control circuit 172 shown in FIG. 2 is mounted on the control circuit board 20, and a driver circuit board 174 is mounted on the driver circuit board 22. The control circuit board 20 and the driver circuit board 22 are connected by a flat cable (not shown) (see FIG. 7 to be described later). The flat cable passes through a slit-shaped opening 10d formed in the partition wall 10c and is a lower storage space. To the upper storage space.

  FIG. 7 is an exploded perspective view of the power converter 200. As described above, the control circuit board 20 on which the control circuit 172 is mounted is disposed inside the lid 8, that is, in the upper storage space of the housing 10. An opening 8 a for the connector 21 is formed in the lid 8. Low voltage DC power for operating the control circuit in the power converter 200 is supplied from the connector 21.

  Although details will be described later, the flow path forming body 12 is formed with a flow path through which the cooling water flowing from the inlet pipe 13 flows. The flow path forms a U-shaped flow path that flows along the three side surfaces of the flow path forming body 12. The cooling water flowing in from the inlet pipe 13 flows into the flow path from one end of the U-shaped flow path, flows through the flow path, and then flows out from the outlet pipe 14 connected to the other end of the flow path. .

  Three openings 400a to 400c are formed on the upper surface of the flow path, and the power modules 300U, 300V, and 300W including the series circuit 150 (see FIG. 1) are inserted into the flow path from the openings 400a to 400c. Inserted. The power module 300U includes a U-phase series circuit 150, the power module 300V includes a V-phase series circuit 150, and the power module 300W includes a W-phase series circuit 150. These power modules 300U to 300W have the same configuration and the same external shape. Openings 400a to 400c are closed by the flanges of inserted power modules 300U to 300W.

  A storage space 405 for storing electrical components is formed in the flow path forming body 12 so as to be surrounded by a U-shaped flow path. In the present embodiment, the capacitor module 500 is stored in the storage space 405. The capacitor module 500 stored in the storage space 405 is cooled by cooling water flowing in the flow path. Above the capacitor module 500, a bus bar assembly 800 to which AC bus bars 802U to 802W are attached is disposed. The bus bar assembly 800 is fixed to the upper surface of the flow path forming body 12. A current sensor module 180 is fixed to the bus bar assembly 800.

  The driver circuit board 22 is disposed above the bus bar assembly 800 by being fixed to a support member 807 a provided in the bus bar assembly 800. As described above, the control circuit board 20 and the driver circuit board 22 are connected by the flat cable 23. The flat cable 23 is pulled out from the lower storage space to the upper storage space through the slit-shaped opening 10d formed in the partition wall 10c.

  As described above, the power modules 300U to 300W, the driver circuit board 22 and the control circuit board 20 are hierarchically arranged in the height direction, and the control circuit board 20 is arranged at a place farthest from the high power system power modules 300U to 300W. Therefore, it is possible to reduce mixing of switching noise and the like on the control circuit board 20 side. Furthermore, since the driver circuit board 22 and the control circuit board 20 are arranged in different storage spaces partitioned by the partition wall 10c, the partition wall 10c functions as an electromagnetic shield and enters the control circuit board 20 from the driver circuit board 22. Noise can be reduced. The housing 10 is made of a metal material such as aluminum.

  Furthermore, since the control circuit board 20 is fixed to the partition wall 10c formed integrally with the housing 10, the mechanical resonance frequency of the control circuit board 20 is increased with respect to external vibration. Therefore, it is difficult to be affected by vibration from the vehicle side, and reliability is improved.

  Hereinafter, the flow path forming body 12, the power modules 300U to 300W fixed to the flow path forming body 12, the capacitor module 500, and the subassembly 800 will be described in more detail. FIG. 8 is an external perspective view in which the power modules 300U to 300W, the capacitor module 500, and the bus bar assembly 800 are assembled to the flow path forming body 12. FIG. 9 shows a state in which the bus bar assembly 800 is removed from the flow path forming body 12. The bus bar assembly 800 is bolted to the flow path forming body 12.

  First, the flow path forming body 12 will be described with reference to FIGS. FIG. 10 is a perspective view of the flow path forming body 12, and FIG. 11 is an exploded perspective view of the flow path forming body 12 as seen from the back side. As shown in FIG. 10, the flow path forming body 12 is a rectangular parallelepiped having a planar shape, and an inlet pipe 13 and an outlet pipe 14 are provided on a side surface 12d thereof. In addition, the side surface 12d is formed in a stepped portion where the pipes 13 and 14 are provided. As shown in FIG. 11, the flow path 19 is formed in a U shape so as to follow the remaining three side surfaces 12 a to 12 c. Further, a U-shaped opening 404 connected to one having the same shape as the cross-sectional shape of the flow path 19 is formed on the back surface side of the flow path forming body 12. The opening 404 is closed by a U-shaped lower cover 420. A seal member 409a is provided between the lower cover 420 and the flow path forming body 12, and airtightness is maintained.

  The flow path 19 having a U-shape is divided into three flow path sections 19a, 19b, and 19c according to the direction in which the cooling water flows. Although details will be described later, the first flow path section 19a is provided along the side face 12a at a position facing the side face 12d provided with the pipes 13 and 14, and the second flow path section 19b is one of the side faces 12a. The third flow path section 19c is provided along the side surface 12c adjacent to the other side of the side surface 12a. The cooling water flows from the inlet pipe 13 into the flow path section 19b, flows in the order of the flow path section 19b, the flow path section 19a, and the flow path section 19c, and flows out from the outlet pipe 14 as indicated by broken line arrows.

  As shown in FIG. 10, on the upper surface side of the flow path forming body 12, a rectangular opening 402a parallel to the side surface 12a is formed at a position facing the flow path section 19a, and at a position facing the flow path section 19b. A rectangular opening 402b parallel to the side surface 12b is formed, and a rectangular opening 402c parallel to the side surface 12c is formed at a position facing the flow path section 19c. The power modules 300U to 300W are inserted into the flow path 19 through the openings 402a to 402c.

  As shown in FIG. 11, the lower cover 420 is formed with convex portions 406 that protrude toward the lower side of the flow path 19 at positions facing the above-described openings 402 a to 402 c. These protrusions 406 are indented when viewed from the flow path 19 side, and the lower end portions of the power modules 300U to 300W inserted from the openings 402a to 402c enter these indentations. Since the flow path forming body 12 is formed so that the opening 404 and the openings 402a to 402c face each other, the flow path forming body 12 is configured to be easily manufactured by aluminum casting.

  As shown in FIG. 10, the flow path forming body 12 is provided with a rectangular storage space 405 that is formed so that three sides are surrounded by the flow path 19. The capacitor module 500 is stored in the storage space 405. Since the storage space 405 surrounded by the flow path 19 has a rectangular parallelepiped shape, the capacitor module 500 can be formed into a rectangular parallelepiped shape, and the productivity of the capacitor module 500 is improved.

  Detailed configurations of the power modules 300U to 300W and the power modules 301U to 301W used in the inverter circuit 140 will be described with reference to FIGS. The power modules 300U to 300W and the power modules 301U to 301W have the same structure, and the structure of the power module 300U will be described as a representative. 12 to 26, the signal terminal 325U corresponds to the gate electrode 154 and the signal emitter electrode 155 disclosed in FIG. 2, and the signal terminal 325L corresponds to the gate electrode 164 and the emitter electrode 165 disclosed in FIG. To do. The DC positive terminal 315B is the same as the positive terminal 157 disclosed in FIG. 2, and the DC negative terminal 319B is the same as the negative terminal 158 disclosed in FIG. The AC terminal 320B is the same as the AC terminal 159 disclosed in FIG.

  FIG. 12A is a perspective view of the power module 300U of the present embodiment. FIG. 12B is a cross-sectional view of the power module 300 </ b> U of the present embodiment cut along a cross section D and viewed from the direction E.

  FIG. 13 is a diagram showing a power module 300U in which the screw 309 and the second sealing resin 351 are removed from the state shown in FIG. FIG. 13A is a perspective view, and FIG. 13B is a cross-sectional view taken along the section D and viewed from the direction E as in FIG. 12B. FIG. 13C shows a cross-sectional view before the fin 305 is pressed and the bending portion 304A is deformed.

  FIG. 14 is a diagram showing a power module 300U in which the module case 304 is further removed from the state shown in FIG. 14 (a) is a perspective view, and FIG. 14 (b) is a cross-sectional view taken along the section D and viewed from the direction E as in FIGS. 12 (b) and 13 (b).

  FIG. 15 is a perspective view of the power module 300U in which the first sealing resin 348 and the wiring insulating portion 608 are further removed from the state shown in FIG.

  FIG. 16 is a diagram showing an auxiliary mold body 600 in the power module 300U. 16 (a) is a perspective view, and FIG. 16 (b) is the same as FIG. 12 (b), FIG. 13 (b), and FIG. It is sectional drawing.

  As shown in FIGS. 14 and 15, the power semiconductor elements (IGBT 328, IGBT 330, diode 156, and diode 166) constituting the upper and lower arm series circuit 150 are connected by the conductor plate 315 and the conductor plate 318, or by the conductor plate 320 and the conductor plate 319. Therefore, it is fixed by being sandwiched from both sides. The conductor plate 315 and the like are sealed with the first sealing resin 348 with the heat dissipation surface exposed, and the insulating sheet 333 is thermocompression bonded to the heat dissipation surface. As shown in FIG. 14, the first sealing resin 348 has a polyhedral shape (here, a substantially rectangular parallelepiped shape).

  The module primary sealing body 302 sealed with the first sealing resin 348 is inserted into the module case 304 and sandwiched with the insulating sheet 333, and is thermocompression bonded to the inner surface of the module case 304 that is a CAN type cooler. The Here, the CAN-type cooler is a cylindrical cooler having an insertion port 306 on one surface and a bottom on the other surface. The gap remaining inside the module case 304 is filled with the second sealing resin 351.

  The module case 304 is made of a member having electrical conductivity, for example, an aluminum alloy material (Al, AlSi, AlSiC, Al—C, etc.), and is integrally formed without a joint. The module case 304 has a structure in which no opening other than the insertion port 306 is provided. The insertion port 306 is surrounded by a flange 304B. Also, as shown in FIG. 12 (a), the first heat radiating surface 307A and the second heat radiating surface 307B, which are wider than the other surfaces, are arranged facing each other so as to face these heat radiating surfaces. Each power semiconductor element (IGBT 328, IGBT 330, diode 156, diode 166) is arranged. The three surfaces that connect the first heat radiation surface 307A and the second heat radiation surface 307B that face each other constitute a surface that is sealed with a narrower width than the first heat radiation surface 307A and the second heat radiation surface 307B, and the other one side surface An insertion port 306 is formed at the bottom. The shape of the module case 304 does not need to be an accurate rectangular parallelepiped, and the corner may form a curved surface as shown in FIG.

  By using the metal case having such a shape, even when the module case 304 is inserted into the flow path 19 through which a coolant such as water or oil flows, a seal against the coolant can be secured by the flange 304B. Can be prevented from entering the inside of the module case 304 with a simple configuration. Further, the fins 305 are uniformly formed on the first heat radiation surface 307A and the second heat radiation surface 307B facing each other. Further, a curved portion 304A having an extremely thin thickness is formed on the outer periphery of the first heat radiating surface 307A and the second heat radiating surface 307B. Since the curved portion 304A is extremely thin to such an extent that it can be easily deformed by pressurizing the fin 305, the productivity after the module primary sealing body 302 is inserted is improved.

  As described above, the gap between the conductor plate 315 and the inner wall of the module case 304 can be reduced by thermocompression bonding the conductor plate 315 and the like to the inner wall of the module case 304 via the insulating sheet 333, and the power semiconductor The generated heat of the element can be efficiently transmitted to the fin 305. Further, by providing the insulating sheet 333 with a certain degree of thickness and flexibility, the generation of thermal stress can be absorbed by the insulating sheet 333, which is favorable for use in a power conversion device for a vehicle having a large temperature change. .

  Outside the module case 304, a metallic DC positive wiring 315A and a DC negative wiring 319A for electrical connection with the capacitor module 500 are provided, and a DC positive terminal 315B (157) and a DC are connected to the tip thereof. Negative terminals 319B (158) are formed respectively. Also, a metallic AC wiring 320A for supplying AC power to motor generator MG1 or MG2 is provided, and an AC terminal 320B (159) is formed at the tip thereof. In the present embodiment, as shown in FIG. 15, the DC positive electrode wiring 315A is connected to the conductor plate 315, the DC negative electrode wiring 319A is connected to the conductor plate 319, and the AC wiring 320A is connected to the conductor plate 320.

  In addition to the module case 304, metal signal wirings 324U and 324L for electrical connection with the driver circuit 174 are provided, and the signal terminals 325U (154, 155) and the signal terminals 325L are provided at the front ends thereof. (164, 165) are formed. In the present embodiment, as shown in FIG. 15, the signal wiring 324U is connected to the IGBT 328, and the signal wiring 324L is connected to the IGBT 328.

  The DC positive electrode wiring 315A, the DC negative electrode wiring 319A, the AC wiring 320A, the signal wiring 324U, and the signal wiring 324L are integrally molded as the auxiliary mold body 600 in a state where they are insulated from each other by the wiring insulating portion 608 formed of a resin material. Is done. The wiring insulating portion 608 also acts as a support member for supporting each wiring, and a thermosetting resin or a thermoplastic resin having an insulating property is suitable for the resin material used therefor. Thereby, it is possible to secure insulation between the DC positive electrode wiring 315A, the DC negative electrode wiring 319A, the AC wiring 320A, the signal wiring 324U, and the signal wiring 324L, and high-density wiring is possible. The auxiliary mold body 600 is fixed to the module case 304 with a screw 309 that passes through a screw hole provided in the wiring insulating portion 608 after being metal-bonded to the module primary sealing body 302 at the connection portion 370. For example, TIG welding or the like can be used for metal bonding between the module primary sealing body 302 and the auxiliary mold body 600 in the connection portion 370.

  The direct current positive electrode wiring 315A and the direct current negative electrode wiring 319A are stacked on each other in a state of facing each other with the wiring insulating portion 608 interposed therebetween, and have a shape extending substantially in parallel. With such an arrangement and shape, the current that instantaneously flows during the switching operation of the power semiconductor element flows oppositely and in the opposite direction. As a result, the magnetic fields produced by the currents cancel each other out, and this action can reduce the inductance. The AC wiring 320A and the signal terminals 325U and 325L also extend in the same direction as the DC positive wiring 315A and the DC negative wiring 319A.

  The connection part 370 where the module primary sealing body 302 and the auxiliary mold body 600 are connected by metal bonding is sealed in the module case 304 by the second sealing resin 351. Thereby, since a necessary insulation distance can be stably ensured between the connection part 370 and the module case 304, the power module 300U can be downsized as compared with the case where sealing is not performed.

  As shown in FIGS. 15 and 16, the auxiliary module 600 side DC positive connection terminal 315C, the auxiliary module side DC negative connection terminal 319C, the auxiliary module side AC connection terminal 320C, and the auxiliary module are provided on the auxiliary module 600 side of the connecting portion 370. The side signal connection terminal 326U and the auxiliary module side signal connection terminal 326L are arranged in a line. On the other hand, on the module primary sealing body 302 side of the connection portion 370, along one surface of the first sealing resin 348 having a polyhedral shape, an element side DC positive connection terminal 315D, an element side DC negative connection terminal 319D, The element side AC connection terminal 320D, the element side signal connection terminal 327U, and the element side signal connection terminal 327L are arranged in a line. Thus, the structure in which the terminals are arranged in a row in the connection portion 370 facilitates the manufacture of the module primary sealing body 302 by transfer molding.

  Here, the positional relationship of each terminal when the portion extending outward from the first sealing resin 348 of the module primary sealing body 302 is viewed as one terminal for each type will be described. In the following description, a terminal constituted by the DC positive electrode wiring 315A (including the DC positive electrode terminal 315B and the auxiliary module side DC positive electrode connection terminal 315C) and the element side DC positive electrode connection terminal 315D is referred to as a positive electrode side terminal. A terminal composed of the DC negative electrode terminal 319B (including the auxiliary module side DC negative electrode connection terminal 319C) and the element side DC negative electrode connection terminal 315D is referred to as a negative electrode side terminal, and AC wiring 320A (AC terminal 320B and auxiliary module side AC connection) The terminal composed of the terminal 320C and the element side AC connection terminal 320D is referred to as an output terminal, and is composed of the signal wiring 324U (including the signal terminal 325U and the auxiliary module side signal connection terminal 326U) and the element side signal connection terminal 327U. Is called the upper arm signal terminal. It refers to a line 324L (including signal terminals 325L and the auxiliary module-side signal connecting terminals 326L) and the terminal constituted by the element-side signal connecting terminals 327L and the signal terminal for the lower arm.

  Each of the above terminals protrudes from the first sealing resin 348 and the second sealing resin 351 through the connecting portion 370, and each protruding portion from the first sealing resin 348 (element side DC positive electrode connecting terminal 315D). , Element side DC negative connection terminal 319D, element side AC connection terminal 320D, element side signal connection terminal 327U and element side signal connection terminal 327L) are one surface of the first sealing resin 348 having a polyhedral shape as described above. Are lined up in a row. Further, the positive electrode side terminal and the negative electrode side terminal protrude in a stacked state from the second sealing resin 351 and extend outside the module case 304. With such a configuration, the power semiconductor element and the terminal are connected during mold clamping when the module primary sealing body 302 is manufactured by sealing the power semiconductor element with the first sealing resin 348. It is possible to prevent an excessive stress on the portion and a gap in the mold from occurring. Further, since the magnetic fluxes in the directions canceling each other are generated by the currents in the opposite directions flowing through each of the stacked positive electrode side terminals and negative electrode side terminals, the inductance can be reduced.

  On the auxiliary module 600 side, the auxiliary module side DC positive electrode connection terminal 315C and the auxiliary module side DC negative electrode connection terminal 319C are the DC positive electrode terminal 315B, the DC positive electrode wiring 315A opposite to the DC negative electrode terminal 319B, and the tips of the DC negative electrode wiring 319A. It is formed in each part. Further, the auxiliary module side AC connection terminal 320C is formed at the tip of the AC wiring 320A opposite to the AC terminal 320B. The auxiliary module side signal connection terminals 326U and 326L are formed at the distal ends of the signal wirings 324U and 324L opposite to the signal terminals 325U and 325L, respectively.

  On the other hand, on the module primary sealing body 302 side, the element side DC positive connection terminal 315D, the element side DC negative connection terminal 319D, and the element side AC connection terminal 320D are formed on the conductor plates 315, 319, and 320, respectively. The element side signal connection terminals 327U and 327L are connected to the IGBTs 328 and 330 by bonding wires 371, respectively.

  Next, the assembly process of the module primary sealing body 302 is demonstrated using FIG. 17 thru | or FIG.

  As shown in FIG. 17, the DC positive electrode side conductor plate 315 and the AC output side conductor plate 320 and the element side signal connection terminals 327U and 327L are connected to a common tie bar 372, and are substantially the same. It is integrally processed so as to have a planar arrangement. To the conductor plate 315, the collector electrode of the IGBT 328 on the upper arm side and the cathode electrode of the diode 156 on the upper arm side are fixed. The conductor plate 320 is fixedly attached with a collector electrode of the IGBT 330 on the lower arm side and a cathode electrode of the diode 166 on the lower arm side. On the IGBTs 328 and 330 and the diodes 155 and 166, the conductor plate 318 and the conductor plate 319 are arranged in substantially the same plane. To the conductor plate 318, the emitter electrode of the IGBT 328 on the upper arm side and the anode electrode of the diode 156 on the upper arm side are fixed. On the conductor plate 319, an emitter electrode of the IGBT 330 on the lower arm side and an anode electrode of the diode 166 on the lower arm side are fixed. Each power semiconductor element is fixed to an element fixing portion 322 provided on each conductor plate via a metal bonding material 160. The metal bonding material 160 is, for example, a low-temperature sintered bonding material including a solder material, a silver sheet, and fine metal particles.

  Each power semiconductor element has a flat plate-like structure, and each electrode of the power semiconductor element is formed on the front and back surfaces. As shown in FIG. 17, each electrode of the power semiconductor element is sandwiched between a conductor plate 315 and a conductor plate 318, or a conductor plate 320 and a conductor plate 319. In other words, the conductor plate 315 and the conductor plate 318 are stacked so as to face each other substantially in parallel via the IGBT 328 and the diode 156. Similarly, the conductor plate 320 and the conductor plate 319 have a stacked arrangement facing each other substantially in parallel via the IGBT 330 and the diode 166. In addition, the conductor plate 320 and the conductor plate 318 are connected via an intermediate electrode 329. By this connection, the upper arm circuit and the lower arm circuit are electrically connected to form an upper and lower arm series circuit.

  As described above, the IGBT 328 and the diode 156 are sandwiched between the conductor plate 315 and the conductor plate 318, and the IGBT 330 and the diode 166 are sandwiched between the conductor plate 320 and the conductor plate 319, so that the conductor plate 320 and the conductor plate 318 are connected to the intermediate electrode. By connecting via 329, the result is as shown in FIG. After that, the control electrode 328A of the IGBT 328 and the element side signal connection terminal 327U are connected by the bonding wire 371, and the control electrode 330A of the IGBT 330 and the element side signal connection terminal 327L are connected by the bonding wire 371, so that FIG. It becomes like this.

  When assembled to the state shown in FIG. 19, the portion including the power semiconductor element and the bonding wire 371 is sealed with the first sealing resin 348 as shown in FIG. 20. At this time, the mold pressing surface 373 is pressed by a mold from above and below, and the first sealing resin 348 is filled into the mold by transfer molding and molded.

  After sealing with the first sealing resin 348, the tie bar 372 is cut off to separate the element side DC positive connection terminal 315D, the element side AC connection terminal 320D, and the element side signal connection terminals 327U and 327L. The element side DC positive connection terminal 315D, the element side DC negative connection terminal 319D, the element side AC connection terminal 320D, and the element side signal connection terminals 327U and 327L arranged in a line on one side of the module primary sealing body 302 are arranged. Each end is bent in the same direction as shown in FIG. Thereby, the work at the time of metal bonding between the module primary sealing body 302 and the auxiliary mold body 600 at the connection portion 370 can be facilitated to improve productivity, and the reliability of metal bonding can be improved.

  FIG. 22 is a view for explaining the transfer molding process of the first sealing resin 348. FIG. 22A shows a longitudinal sectional view before clamping, and FIG. 22B shows a longitudinal sectional view after clamping.

  As shown in FIG. 22A, the module primary sealing body 302 before sealing shown in FIG. 19 is installed between the upper mold 374A and the lower mold 374B. The upper mold 374A and the lower mold 374B sandwich the module primary sealing body 302 from above and below the mold pressing surface 373 and clamp the mold, so that the mold space 375 becomes a mold as shown in FIG. Formed inside. By filling and molding the mold space 375 with the first sealing resin 348, the power semiconductor elements (IGBTs 328 and 330 and the diodes 155 and 166) are sealed with the first sealing resin 348 in the module primary sealing body 302. Stopped.

  As shown in FIG. 20, on the mold pressing surface 373, the element side DC positive connection terminal 315D, the element side DC negative connection terminal 319D, the element side AC connection terminal 320D, the element side signal connection terminal 327U, and the element side signal The connection terminals 327L are arranged in a line. By adopting such a terminal arrangement, the upper mold 374A and the lower mold 374B are used, and the mold is clamped without generating any excessive stress at the connection portion between each terminal and the power semiconductor element. Can do. Therefore, the power semiconductor element can be sealed without causing damage to the power semiconductor element or leaking the first sealing resin 348 from the gap.

  Next, the arrangement relationship between the control electrode and each terminal of the power semiconductor element in the module primary sealing body 302 will be described with reference to FIG. FIG. 23 shows a state in which the conductor plates 318 and 319 and the intermediate electrode 329 are removed from the state of FIG. 18 for easy understanding. In FIG. 23, control electrodes 328A and 330A are arranged on one side of IGBTs 328 and 330 (upper side in the figure) at positions that are biased to the left in the figure with respect to center lines 376 and 377, respectively. Center lines 376 and 377 are orthogonal to the arrangement direction of element side DC positive connection terminal 315D, element side DC negative connection terminal 319D, element side AC connection terminal 320D, element side signal connection terminal 327U, and element side signal connection terminal 327L. Yes.

  When the IGBT 328 is divided into two by the center line 376, the element side signal connection terminal 327U is disposed on one side where the control electrode 328A is disposed, and the element side DC positive connection terminal 315D is disposed on the other side. ing. Similarly, when the IGBT 330 is divided into two by the center line 377, the element-side signal connection terminal 327L is disposed on one side where the control electrode 330A is disposed, and the element-side AC connection terminal 320D is disposed on the other side. Has been placed. As shown in FIG. 18, an element side DC negative electrode connection terminal 319D is arranged between the element side DC positive electrode connection terminal 315D and the element side signal connection terminal 327L. With such an arrangement, it is possible to minimize the length of the bonding wire 371 that connects the control electrodes 328A and 330A and the element-side signal connection terminals 327U and 327L, respectively, and to improve the connection reliability. Moreover, each terminal can be integrated and the module primary sealing body 302 and by extension, the power module 300U can be reduced in size.

  As shown in FIG. 23, the element-side DC positive electrode connection terminal 315D, the element-side AC connection terminal 320D, the element-side signal connection terminal 327U, and the element-side signal connection terminal 327L are integrally connected to a common tie bar 372. Processed. As a result, variations in flatness and thickness between these terminals can be minimized. On the other hand, since the element side DC negative electrode connection terminal 319D is combined with those processed separately from the above terminals, the variation in flatness and thickness is larger than that of the other terminals. At the time of fastening, there is a possibility that extra stress is generated at the connection portion between the terminal and the power semiconductor element.

  FIG. 24 is a diagram illustrating a modification for avoiding the above-described inconvenience. In this modification, the conductor plate 319 provided with the element side DC negative electrode connection terminal 319D is provided with a stress relaxation portion 319E for absorbing and relaxing the stress at the time of clamping. The position of the stress relaxation portion 319E is preferably between the portion where the power semiconductor element is mounted (soldering portion) and the mold pressing surface 373. Note that it is conceivable that the thickness of a part of the conductor plate 319 is simply made thinner than the other part as the stress relaxation part 319E, but in this case, the current density is increased in that part, so that the electrical performance is lowered There is a risk. Therefore, as shown in FIG. 24, it is preferable that a part of the conductor plate 319 is bent to form the stress relaxation portion 319E. In this way, the current density does not increase in the stress relaxation portion 319E, and the current direction is opposed to the folded portion due to the bending, which can contribute to suppression of inductance.

  FIG. 25 is a circuit diagram showing a circuit configuration of the power module 300U. The collector electrode of the IGBT 328 on the upper arm side and the cathode electrode of the diode 156 on the upper arm side are connected via a conductor plate 315. Similarly, the collector electrode of the IGBT 330 on the lower arm side and the cathode electrode of the diode 166 on the lower arm side are connected via the conductor plate 320. Further, the emitter electrode of the IGBT 328 on the upper arm side and the anode electrode of the diode 156 on the upper arm side are connected via a conductor plate 318. Similarly, the emitter electrode of the IGBT 330 on the lower arm side and the anode electrode of the diode 166 on the lower arm side are connected via a conductor plate 319. Conductor plates 318 and 320 are connected by an intermediate electrode 329. With such a circuit configuration, an upper and lower arm series circuit is formed.

  Next, the action of reducing the inductance will be described with reference to FIG. FIG. 26A is a diagram showing an equivalent circuit when a recovery current flows, and FIG. 26B is a diagram showing a path of the recovery current.

  In FIG. 26A, it is assumed that the diode 166 on the lower arm side is conductive in the forward bias state. In this state, when the IGBT 328 on the upper arm side is turned on, the diode 166 on the lower arm side becomes a reverse bias, and a recovery current caused by carrier movement passes through the upper and lower arms. At this time, a recovery current 360 shown in FIG. 26B flows through each of the conductor plates 315, 318, 319, and 320. As indicated by the dotted line, the recovery current 360 passes through the DC positive terminal 315B (157) disposed opposite to the DC negative terminal 319B (158), and is subsequently formed by the conductor plates 315, 318, 319, and 320. It flows through the loop-shaped path, and again flows as shown by the solid line through the DC negative terminal 319B (158) arranged opposite to the DC positive terminal 315B (157). As a current flows through the loop-shaped path, an eddy current 361 flows through the first heat radiating surface 307A and the second heat radiating surface 307B of the module case 304. Due to the magnetic field canceling effect generated by the equivalent circuit 362 in the current path of the eddy current 361, the wiring inductance 363 in the loop-shaped path is reduced.

  Note that the closer the current path of the recovery current 360 is to the loop shape, the greater the inductance reduction action. In the present embodiment, the loop-shaped current path flows through a path close to the DC positive terminal 315B (157) side of the conductor plate 315 and passes through the IGBT 328 and the diode 156 as indicated by a dotted line. The loop-shaped current path flows through a path farther from the DC positive electrode terminal 315B (157) side of the conductor plate 318, as indicated by the solid line, and then farther from the DC positive electrode terminal 315B (157) side of the conductor plate 320, as indicated by the dotted line. The path flows through the IGBT 330 and the diode 166. Further, as indicated by the solid line, the loop-shaped current path flows along a path close to the DC negative electrode wiring 319A side of the conductor plate 319. Thus, the loop-shaped current path passes through a path closer to or farther from the DC positive terminal 315B (157) or the DC negative terminal 319B (158), thereby forming a current path closer to the loop shape. Is done.

  FIG. 38 is a diagram illustrating a modification in the case where the DC negative electrode wiring is divided. In addition, the structure of the same code | symbol as the code | symbol mentioned above has the same function. The element-side DC negative electrode connection terminal 319D shown in FIG. 18 is combined with those processed separately from the above-mentioned terminals, so that variations in flatness and thickness are larger than those of other terminals. Therefore, there is a possibility that extra stress is generated in the connection portion between the terminal and the power semiconductor element during mold clamping.

  Therefore, as shown in FIG. 38, the element-side DC negative connection terminal 319D shown in FIG. 18 is divided so that the negative-side connection terminal 319F serves as the element-side AC connection terminal 320D and the element-side DC positive connection terminal 315D. Are arranged on substantially the same plane.

  As shown in FIG. 39, the element-side DC negative electrode connection terminal 319G extends from the edge of the conductor 319 to a position facing a part of the negative electrode-side connection terminal 319F. And the edge part of element side direct current | flow negative electrode connection terminal 319G is bend | folded to the negative electrode side connection terminal 319F side.

  As shown in FIG. 40, the end of the element-side DC negative electrode connection terminal 319G is connected to the negative electrode-side connection terminal 319F through the metal bonding material 161. After various semiconductor elements and terminals are bonded with a metal bonding material, the module shown in FIG. 40 is sealed with the first sealing resin 348 by the manufacturing method shown in FIG. The primary sealing body 303 is completed. As shown in FIG. 41, the negative electrode side connection terminal 319F is formed integrally with the tie bar 372 together with the element side DC positive electrode connection terminal 315D, the element side AC connection terminal 320D, and the element side signal connection terminal 327U. The tie bar 372 can be cut in a lump including the connection portion with the negative electrode side connection terminal 319F.

  As a result, variations in flatness and thickness between these terminals can be minimized.

  FIG. 27 is an external perspective view of the capacitor module 500. A plurality of capacitor cells are provided in the capacitor module 500. Capacitor terminals 503 a to 503 c are provided on the upper surface of the capacitor module 500 so as to protrude close to the surface of the capacitor module 500 facing the flow path 19. The capacitor terminals 503a to 503c are formed corresponding to the positive terminal 157 and the negative terminal 158 of each power module 300. The capacitor terminals 503a to 503c have the same shape, and an insulating sheet is provided between the negative electrode side capacitor terminal 504 and the positive electrode side capacitor terminal 506 constituting the capacitor terminals 503a to 503c, and insulation between the terminals is ensured. Yes.

  Protrusions 500e and 500f are formed on the upper side of the side surface 500d of the capacitor module 500. A discharge resistor is mounted in the protruding portion 500e, and a Y capacitor for countering common mode noise is mounted in the protruding portion 500f. Further, the power supply terminals 508 and 509 shown in FIG. 5 are attached to the terminals 500g and 500h protruding from the upper surface of the protruding portion 500f. As shown in FIG. 10, recesses 405a and 405b are formed between the openings 402b and 402c and the side surface 12d. When the capacitor module 500 is stored in the storage space 405 of the flow path forming body 12, the protruding portion 500e is formed. The recessed portion 405a is housed, and the protruding portion 500f is housed in the recessed portion 405b.

  The discharge resistor mounted in the protrusion 500e is a resistor for discharging the electric charge accumulated in the capacitor cell in the capacitor module 500 when the inverter is stopped. Since the recessed portion 405a in which the protruding portion 500e is accommodated is provided immediately above the flow path of the cooling water flowing in from the inlet pipe 13, it is possible to suppress the temperature rise of the discharge resistance during discharge.

  FIG. 28 is a perspective view of the bus bar assembly 800. Bus bar assembly 800 detects U, V, W phase AC bus bars 802U, 802V, 802W, holding member 803 for holding and fixing AC bus bars 802U-802W, and AC current flowing through AC bus bars 802U-802W. Current sensor module 180. AC bus bars 802U to 802W are each formed of a wide conductor. A plurality of support members 807 a for holding the driver circuit board 22 are formed on the holding member 803 made of an insulating material such as resin so as to protrude upward from the holding member 803.

  The current sensor module 180 is parallel to the side surface 12d at a position close to the side surface 12d of the flow path forming body 12 when the bus bar assembly 800 is solidified on the flow path forming body 12 as shown in FIG. The bus bar assembly 800 is arranged. As shown in FIG. 28, through holes 181 for allowing the AC bus bars 802U to 802W to pass therethrough are formed on the side surfaces of the current sensor module 180, respectively. A sensor element is provided in a portion where the through hole 181 of the current sensor module 180 is formed, and a signal line 182 a of each sensor element protrudes from the upper surface of the current sensor module 180. Each sensor element is arranged side by side in the extending direction of the current sensor module 180, that is, in the extending direction of the side surface 12 d of the flow path forming body 12. The AC bus bars 802U to 802W pass through the respective through holes 181 and their tip portions protrude in parallel.

  On the holding member 803, positioning projections 806a and 806b are formed so as to protrude upward. The current sensor module 180 is fixed to the holding member 803 by screwing. At this time, the protrusions 806a and 806b and the positioning holes formed in the frame body of the current sensor module 180 are engaged, whereby the current sensor module 180 is engaged. 180 positioning is performed. Further, when the driver circuit board 22 is fixed to the support member 807a, the positioning projections 806a and 806b are engaged with the positioning holes formed on the driver circuit board 22 side, whereby the signal line 182a of the current sensor module 180 is obtained. Is positioned in the through hole of the driver circuit board 22. The signal line 182a is joined to the wiring pattern of the driver circuit board 22 by solder.

  In the present embodiment, the holding member 803, the support member 807a, and the protrusions 806a and 806b are integrally formed of resin. As described above, since the holding member 803 has a function of positioning the current sensor module 180 and the driver circuit board 22, assembly and solder connection work between the signal line 182a and the driver circuit board 22 are facilitated. Further, by providing a mechanism for holding the current sensor module 180 and the driver circuit board 22 in the holding member 803, the number of parts as the whole power conversion device can be reduced.

  The AC bus bars 802U to 802W are fixed to the holding member 803 so that the wide surfaces thereof are horizontal, and the connection portion 805 connected to the AC terminals 159 of the power modules 300U to 300W rises vertically. The connecting portion 805 has a concavo-convex shape at the tip, and has a shape in which heat concentrates on the concavo-convex portion during welding.

  Since the current sensor module 180 is arranged in parallel to the side surface 12d of the flow path forming body 12 as described above, the AC bus bars 802U to 802W protruding from the through holes 181 of the current sensor module 180 are connected to the flow path forming body 12. It will be arranged on the side surface 12d. Since each power module 300U-300W is arrange | positioned in the flow-path area 19a, 19b, 19c formed along the side surfaces 12a, 12b, 12c of the flow-path formation body 12, the connection part 805 of alternating current bus-bar 802U-802W is provided. The bus bar assembly 800 is disposed at a position corresponding to the side surfaces 12a to 12b. As a result, as shown in FIG. 8, the U-phase AC bus bar 802U extends from the power module 300U disposed in the vicinity of the side surface 12b to the side surface 12d, and the V-phase AC bus bar 802V is disposed in the vicinity of the side surface 12a. Extending from module 300V to side surface 12d, W-phase AC bus bar 802W extends from power module 300W disposed near side surface 12c to side surface 12d.

  FIG. 29 is a diagram illustrating the flow path forming body 12 in which the power modules 300U to 300W are fixed to the openings 402a to 402c and the capacitor module 500 is stored in the storage space 405. In the example shown in FIG. 29, the U-phase power module 300U is fixed to the opening 402b, the V-phase power module 300V is fixed to the opening 402a, and the W-phase power module 300W is fixed to the opening 402c. Thereafter, the capacitor module 500 is stored in the storage space 405, and the terminals on the capacitor side and the terminals of each power module are connected by welding or the like. Each terminal protrudes from the upper end surface of the flow path forming body 12, and a welding operation is performed by approaching a welding machine from above.

  The positive and negative terminals 157 and 158 of the power modules 300U to 300W arranged in a U-shape are connected to capacitor terminals 503a to 503c provided to protrude from the upper surface of the capacitor module 500. Since the three power modules 300U to 300W are provided so as to surround the capacitor module 500, the positional relationship of the power modules 300U to 300W with respect to the capacitor module 500 is equivalent, and the capacitor terminals 503a to 503c having the same shape are used. The capacitor module 500 can be connected in a well-balanced manner. For this reason, the circuit constants of the capacitor module 500 and the power modules 300U to 300W are easily balanced in each of the three phases, and the structure is such that current can be easily taken in and out.

  FIG. 30 is a horizontal cross-sectional view of the flow path forming body 12 in which the power modules 300U to 300W and the capacitor module 500 are arranged as shown in FIG. As described above, the U-shaped channel 19 is formed in the channel forming body 12, and the U-phase power module 300U is provided in the channel section 19b formed along the side surface 12b on the left side of the figure. Has been placed. Similarly, a V-phase power module 300V is arranged along the right side surface 12 in the flow path section 19a formed along the side surface 12a opposite to the side surface 12d where the pipes 13 and 14 are provided. A W-phase power module 300W is disposed in the flow path section 19c.

  Openings 12 g and 12 h are formed on the side surface 12 d of the flow path forming body 12. The opening 12g communicates with the flow path section 19b through the communication path 12e. The opening 12h communicates with the flow path section 19c through the communication path 12f. The pipes 13 and 14 disposed in the openings 12g and 12h are attached so as to be press-fitted into the communication paths 12e and 12f.

  FIG. 37 shows a cross-sectional view of the flow path forming body 12 as seen from the arrow direction of the AA cross section of FIG. In the communication path 12f, the shape of the cross section of the flow path along the flow direction of the cooling water is greatly changed. In addition, the flow of the cooling water of the present embodiment is branched into two by the side surface of the power module 300U, one flow is directed to the first heat radiating surface 307A side of the module case 304, and the other flow is the module case. It goes to the second heat radiating surface 307B side of 304. The first heat radiating surface 307A is a heat radiating surface opposite to the second heat radiating surface 307B shown in FIG. 37, and is not visible in FIG. Therefore, when the cooling water of this embodiment collides with the side surface of the power module 300U, the pressure loss for flowing the cooling water tends to increase. In order to suppress the increase in pressure loss, it is necessary to arrange the flow of the cooling water in the vicinity of the side surface portion of the power module 300U. Therefore, the run-up section 12j is formed so that the width in the height direction is gradually increased in the direction from the inlet pipe 13 side toward the power module 300U. In addition, the shape of the run-up section 12j is not formed in a step shape as shown in FIG. 37, but may be a smooth slope shape.

  In the present embodiment, the U-shaped flow path 19 is formed along the three side surfaces 12a to 12c of the flow path forming body 12 having a substantially square planar shape, and the power modules 300U to 300W are connected to the flow path sections 19a. The flat power modules 300U to 300W are arranged in parallel to the side surfaces 12a to 12c when arranged at ˜19c. And the capacitor module 500 which is an electrical component was accommodated in the center area | region (storage space 405) enclosed by the flow path 19. FIG. By adopting such a module arrangement, the flow path forming body 12 in which the power modules 300U to 300W and the capacitor module 500 are accommodated can be reduced in size.

  When the three power modules 300U to 300W are arranged in a U shape, as shown in FIG. 30, at least one of the power modules 300V arranged between a pair of power modules 300U and 300W arranged in parallel. By arranging the portion so as to enter the region sandwiched between the power modules 300U and 300W, the size can be further reduced.

  FIG. 31 is a schematic diagram for explaining the arrangement of the three power modules 300U to 300W. The power modules 300U to 300W have the same structure and the same shape. The width of the side surfaces 12b and 12c of the flow path forming body needs to be at least about the sum of the length L1 along the flow path of the power modules 300U to 300W and the length L2 of the communication path. On the other hand, at least the dimension L1 is required for the side surface 12a. Of course, in practice, as shown in FIG. 30, it is necessary to slightly adjust the dimensions in consideration of the flow of the cooling water such as the connection portion of the flow path section.

  Therefore, when trying to reduce the installation area of the power conversion device 20 as much as possible, it is conceivable that the power conversion device 200 can be reduced in size by making the shape (planar shape) when viewed in plan view substantially square. . As described above, since a communication path is necessary in the direction along the side surfaces 12b and 12c, from the viewpoint of miniaturization, as shown in FIG. It is preferable to arrange the power module 300V so that a part of 300V is included.

  The horizontal dimension (width dimension of the side surface 12a) of the arrangement space in FIG. 31 is at least about L1 + 2 · L3 when the thickness of the power module is L3. Therefore, if L3 and L4 are set so that the vertical dimension L1 + L2 + (L3−L4) is approximately the same as L1 + L3, the area in plan view can be further reduced, and a substantially square shape can be obtained. Become. At this time, the flow path section 19a is formed so as to pass through a region between the power modules 300U and 300W as shown in FIG. In the example shown in FIG. 30, the interval between the power modules 300 </ b> U and 300 </ b> W is slightly larger than the dimension L <b> 1 of the power module 300 </ b> V due to restrictions due to the dimensions of the capacitor module 500.

  The upper areas of the pipes 13 and 14 and the holes 12e and 12f into which they are press-fitted are vacant spaces. Therefore, as shown in FIG. 10, recesses 405a and 405b are formed in this space, and as shown in FIG. 29, a protruding portion 500e that is a discharge resistance mounting portion of the capacitor module 500, and a protruding portion 500f that is a Y capacitor mounting portion, By arranging the vacant space, the free space can be effectively used, which contributes to the miniaturization of the power conversion device 200. By consolidating the positions of the pipes 13 and 14 on one side surface 12d, the flow of cooling water from the inlet pipe 13 to the flow path section 19b and from the flow path section 19c to the outlet pipe 14 becomes a straight line. Can be made as small as possible. In addition, it is possible to suppress an increase in the installation space of the apparatus due to the protrusion of the pipe, and it is possible to improve on-vehicle performance. Further, when the pipes 13 and 14 are press-fitted into the holes 12e and 12f, the workability and productivity are improved because the press-fitting work is performed only on one surface of the housing.

  Further, since the flow path 19 is provided so as to surround the three sides of the capacitor module 500, the capacitor module 500 can be effectively cooled. By the way, the power converter device 200 in this Embodiment is for vehicle-mounted, and is generally arrange | positioned in an engine room in many cases. Since the inside of the engine room becomes relatively high due to heat from the engine, the traveling motor, etc., heat intrusion from the surroundings to the power conversion device 200 becomes a problem. However, as shown in FIG. 30, since the capacitor module 500 is surrounded on three sides by the flow path 19 through which the cooling water flows, it is possible to effectively block heat intrusion from around the apparatus.

  29, if the power modules 300U to 300W and the capacitor module 500 are arranged in the flow path forming body 12, the bus bar assembly 800 is fixed above the capacitor module 500 as shown in FIG. I do. In the present embodiment, the bus bars 802U to 802W connected to the terminals of the power modules 300U to 300W arranged in a U-shape are routed above the capacitor module 500 so as to be separated from the respective connection portions, thereby forming a flow path forming body. 12 is pulled out from the side surface 12d side. Therefore, the bus bar does not straddle the power module, and the bus bar 802U to 802W is provided at one place, that is, the region of the opening 10a of the housing 10 to which the AC interface 185 is attached while ensuring sufficient insulation (see FIG. 5). Can be aggregated.

  By adopting such a bus bar structure, the power modules 300U to 300W can be moved away from the AC connector portion where heat is generated and the temperature is likely to rise, and heat is transferred to the power modules 300U to 300W via the bus bars 802U to 802W. Can be suppressed. Further, by arranging the bus bars 802U to 802W so as to avoid the upper side of the flow path 19, even when water leaks from the flow path 19, the possibility of electric leakage due to water leak can be reduced.

  In addition, since the bus bar assembly 800 is fixed to the flow path forming body 12 through which the cooling water flows, not only the temperature rise of the bus bar assembly 800 can be suppressed, but also the temperature of the current sensor 180 held by the bus bar assembly 800. The rise can be suppressed. The sensor element provided in the current sensor 180 has a characteristic that is weak against heat, and the reliability of the current sensor 180 can be improved by adopting the above structure.

  After the bus bar assembly 800 is fixed to the flow path forming body 12 as shown in FIG. 8 and the terminal welding operation is performed, the support member 807a formed on the holding member 803 of the bus bar assembly 800 is attached to the support member 807a as shown in FIG. The driver circuit board 22 is fixed. The power conversion device 200 mounted on the vehicle is easily affected by vibrations from the vehicle. Therefore, the plurality of support members 807a formed on the holding member 803 are configured to support not only the periphery of the driver circuit board 22, but also the vicinity of the center, thereby reducing the influence of vibration applied to the driver circuit board 22.

  For example, by supporting the central portion of the driver circuit board 22 by the support member 807a, the resonance frequency of the driver circuit board 22 can be made higher than the frequency of vibration transmitted from the vehicle side. The influence of vibration can be reduced. The driver circuit board 22 is screwed to the support member 807a.

  After the driver circuit board 22 is fixed above the bus bar assembly 800, the housing 10 is bolted to the flow path forming body 12 as shown in FIG. 6, and further, the upper storage space and the lower storage space of the housing 10 are partitioned. The control circuit board 20 is fixed on the partition wall 10c. The driver circuit board 22 in the lower storage space and the control circuit board 20 in the upper storage space are connected by a flat cable 23 as shown in FIG. As described above, the partition wall 10c is formed with the slit-shaped opening 10d for drawing the flat cable 23 from the lower storage space to the upper storage space.

  Since the power modules 300U to 300W are arranged in a U shape along the three side surfaces 12b, 12a, and 12c of the flow path forming body 12, the power modules 300U to 300W are connected to the driver circuit board 22. These control terminals are also arranged in a U-shape along the sides corresponding to the side surfaces 12b, 12a and 12c of the driver circuit board 22, as shown in FIG. The control signal for driving and controlling the power modules 300U to 300W is a high voltage, while the sensor signal of the current sensor 180 and the signal from the flat cable 23 are a low voltage. In order to reduce the influence of high-voltage noise on the low-voltage system, the high-voltage wiring and the low-voltage wiring are preferably arranged separately.

  In the present embodiment, since the power modules 300U to 300W are arranged in a U shape along the side surfaces 12b, 12a, and 12c, the region near the side corresponding to the side surface 12d on the driver circuit board 22 is controlled. It can be used as a space away from the terminal. In the present embodiment, since the bus bars 802U to 802W that are detection targets of the current sensor 180 are concentrated on the side surface 12d side, the current sensor 180 is arranged in parallel near the side surface 12d. Therefore, the signal terminal 182a is disposed in a region near the side corresponding to the side surface 12d of the driver circuit board 22 described above, and can maintain a sufficient distance from the control terminal of the high voltage system. In the driver circuit board 22, the flat cable 23 is disposed on the side corresponding to the side surface 12c of the driver circuit board 22. However, the board near the side surface 12d away from the control terminal is less affected by the control terminal. Connected on top. As a result, the low-voltage signal pattern and the high-voltage signal pattern can be easily separated on the driver circuit board 22.

  Further, the low-voltage control circuit board 20 is disposed in the upper storage space separated by the partition wall 10c, and the flat cable 23 is drawn from the lower storage space through the elongated slit-shaped opening 10d, whereby the control circuit board 20 is provided. The effect of noise on is reduced. Thus, in the power conversion device 200 of the present embodiment, noise countermeasures are sufficiently taken.

  Moreover, the power converter 200 of this Embodiment arrange | positions the capacitor | condenser module 500 and the power modules 300U-300W in the flow-path formation body 12, and fixes the required components, such as the bus-bar assembly 800 and a board | substrate, in order from the bottom. Since it is configured so that it can be performed, productivity and reliability are improved.

  FIG. 32 is a view showing a cross section of the power conversion device 200 and is a cross-sectional view of the power conversion device 200 as viewed from the direction of the pipes 13 and 14. The openings 402a to 402c formed in the flow path forming body 12 are closed by a flange 304b provided in the module case 304 of the power modules 300U to 300W. Although illustration is omitted, a sealing material is provided between the flange 304b and the flow path forming body 12 to ensure airtightness. In the power modules 300U to 300W, the heat radiation surface area where the fins 305 for heat radiation are provided is disposed in the flow path 19, and the lower end portion where the fins 305 are not provided is the protrusion 406 formed on the lower cover 420. It is stored inside the inner depression. Thereby, it is possible to prevent the cooling water from flowing into the space where the fins 305 are not formed. In the power conversion device 200 of the present embodiment, as shown in FIG. 32, the relatively heavy capacitor module 500 is arranged at the lower center of the power conversion device 200, so the center of gravity balance of the power conversion device 200 is good. When the vibration is applied, the power conversion device 200 is not easily ramped.

  FIG. 33 is a diagram illustrating an arrangement when power conversion device 200 of the present embodiment is mounted on a vehicle. FIG. 33 shows an arrangement in the engine room 1000, and three layout patterns A to C are shown in the same drawing. The lower side in the figure corresponds to the front side of the vehicle, and a radiator 1001 is disposed on the front side of the engine room 1000. A transmission TM incorporating a motor generator MG1 is arranged behind the radiator 1001. The signal connector 21 is connected to a vehicle signal harness in the engine room 1000. Although battery 136 is not shown in FIG. 33, battery 136 is a heavy object and is generally disposed near the center of the vehicle, that is, behind the engine room 1000.

  Connection between power conversion device 200 and the vehicle side is connected to piping 13 and 14 related to cooling water, AC connector 187 for supplying AC power to motor generator MG1, and a higher-level control circuit provided on the vehicle side. The arrangement of the communication connector 21 is related. In the present embodiment, the AC connector 187 and the pipes 13 and 14 are arranged on the side surface 12d side of the flow path forming body 12, the signal connector 21 is arranged on the side surface 12b, and the DC connector 138 is arranged on the side surface 12c. I made it. Further, the AC wiring 187 a drawn from the AC connector 187 passes through the pipes 13 and 14 and is drawn to the lower side of the power conversion device 200. Similarly, the DC wiring 138a of the DC connector 138 is also drawn out below the power converter 200.

  In any case of layout patterns A to C in FIG. 33, power conversion device 200 is arranged above transmission TM. Further, the cooling water of the radiator 1001 is supplied to the flow path 19 of the flow path forming body 12. Therefore, when considering the arrangement of the power conversion device 200, considering the workability of the cooling pipe and the AC wiring 187a, the side surface 12d on which the pipes 13, 14 and the AC connector 187 are provided is connected to the radiator 1001 or the transmission TM. It is preferable to arrange in the direction. Furthermore, since the battery 136 that is a DC power supply is provided behind the engine room 1000, it is preferable to arrange the side surface 12c to which the DC connector 138 is mounted facing backward in consideration of the routing of the DC wiring 138a. .

  When the power conversion device 200 is arranged in the engine room 1000, three layout patterns A to C shown in FIG. 33 are conceivable. In consideration of the connection relationship between the radiator 1001, the battery 136, and the transmission TM, the layout pattern A is preferably arranged with the side surface 12d facing the transmission TM, and the layout patterns B and C have the side surface 12d. It is good to arrange in the direction of the radiator 1001.

  In the layout pattern A, the DC connector 138, the AC connector 187, and the signal connector 21 are oriented in a preferable direction in terms of wiring layout. Further, since the pipes 13 and 14 face the direction of the transmission TM, it is necessary to bend the cooling pipe in the direction of the radiator 1001, but since the AC wiring 187a is drawn downward from the AC connector 187, the cooling pipe and Interference with the AC wiring 187a can be avoided, and deterioration of workability can also be prevented.

  In the case of the layout pattern B, the pipes 13 and 14, the AC connector 187, and the signal connector 21 are oriented in a preferable direction. Further, although the DC connector 138 faces the vehicle side, it is only necessary to draw the DC wiring 138a drawn downward from the DC connector 138 backward, so that the workability is prevented from being lowered.

  In the case of the layout pattern C, priority is given to the layout of the cooling pipe, and the side surface 12d is arranged in the direction of the radiator 1001. In this case, the AC wiring 187a is routed in the direction of the transmission TM. However, since the AC wiring 187a is drawn downward through the pipes 13 and 14, the AC wiring 187a and the cooling pipe may interfere with each other. Absent. Therefore, there is no problem in piping work and wiring work.

  As described above, in the power conversion device 200 of the present embodiment, the arrangement of the pipes 13 and 14, the DC connector 138, the AC connector 187, and the signal connector 21 is a preferable arrangement for arranging in the engine room 1000. . Therefore, it is possible to provide the power conversion device 200 that can cope with various situations such as the layout patterns A to C and has excellent in-vehicle performance.

  In the above-described embodiment, the power modules 300U to 300W have a configuration in which a unit in which a power semiconductor element is sandwiched between conductive plates is housed in a module case 304 having heat dissipating surfaces on which fins 305 are formed on both front and back surfaces. ing. Therefore, when the power modules 300U to 300W are provided in the flow path 19, they are arranged in the center of the flow path. However, the arrangement method of the power module is not limited to that described above, and various arrangements are possible.

  The example shown in FIGS. 34 and 35 shows an arrangement method in the case of a power module in which only one side of the module case constitutes a heat radiating surface. The power modules 301U to 301W correspond to the power modules 300U to 300W described above, and the heat radiation fins 305 are formed only on one side of the flat power module.

  In the case of FIG. 34, it arrange | positions so that it may closely_contact | adhere to the inner peripheral surface of flow-path area 19a-19c, ie, the wall surface surrounding the capacitor module 500. FIG. The cooling water flows along the heat radiation surface where the fins 305 are formed. On the other hand, in the example shown in FIG. 35, it arrange | positions so that it may closely_contact | adhere to the outer peripheral surface of flow-path area 19a-19c contrary to the case of FIG.

  34 and 35, the entire power modules 301U to 301W are arranged in the flow path 19. However, only the heat radiation surface may be arranged to be exposed in the flow path 19 as shown in FIG. In the example shown in FIG. 36, the power semiconductor element is provided on the heat radiating plate 3010, and the fin 305 is formed on the back side of the heat radiating plate 3010. As shown in FIGS. A configuration covered with a casing can be arranged in the same manner.

As described above, the power conversion device 200 described in the present embodiment has the following effects.
The power conversion device 200 is provided for each of the three phases of the three-phase inverter circuit 140, and includes power modules 300U to 300W, which are flat semiconductor modules containing the series circuit 150, and a storage space 405 for storing electrical components. And a rectangular parallelepiped flow path forming body 12 having a refrigerant flow path formed so as to surround the storage space 405. And the flow path 19 which is a refrigerant flow path is provided along the flow path section 19a provided along the side surface 12a of the flow path forming body 12, and the side surface 12b adjacent to one side of the side surface 12a. A flow path section 19b connected to one end of the section 19a and a flow path section 19c provided along the side face 12c adjacent to the other side of the side face 12a and connected to the other end of the flow path section 19a. . Furthermore, the power module 300V is disposed in the flow path section 19a so as to be parallel to the side face 12a, the power module 300U is disposed in the flow path section 19b so as to be parallel to the side face 12b, and the power module 300W is It arrange | positions in the flow-path area 19c so that it may become parallel with respect to the side surface 12c.

  Therefore, the three power modules 300U to 300W can surround the storage space 405 in a U-shape, and the shape of the flow path forming body 12 in a plan view can be made substantially square. Thereby, the flow path forming body 12 can be made smaller, and the power converter 200 can be downsized.

  As described above, in a hybrid vehicle or the like, the power conversion device is often placed in the engine room, and the atmospheric temperature of the power conversion device becomes considerably high due to heat generated from the engine and the traveling motor. Therefore, in an in-vehicle power conversion device, it is sometimes necessary to cool not only a power module incorporating a semiconductor element but also other electrical components included in the power conversion device.

  In the present embodiment, for example, by storing an electrical component such as the capacitor module 500 in the storage space 405 surrounded by three surfaces by the flow path 19, not only the heat generated by the electrical component itself is efficiently radiated. In addition, it is possible to prevent heat from entering the electrical equipment from the surrounding environment.

  Further, since the pipes 13 and 14 are provided on the one surface 12d, the press-fitting work of the pipes 13 and 14 is facilitated, and the connection work with the cooling pipe on the vehicle side is facilitated. Moreover, since the flow path from the inflow opening 12g to the flow path section 19b and the flow path from the flow path section 19c to the outflow opening 12h are linear, the pressure loss in the section can be reduced.

  Furthermore, bus bars 802U to 802W that are connected to the AC output terminals of the power modules 300U to 300W and are drawn out to the side surface 12d of the flow path forming body 12 through the storage space 405 are provided. As a result, the members provided protruding from the side surface of the flow path forming body 12, that is, the AC connector 807 and the pipes 13 and 14 connected to the bus bars 802U to 802W are collected on one surface 12d. Can be downsized. Moreover, it becomes easy to layout the cooling pipes and AC wirings when mounted on the vehicle, and the onboard performance is improved. In addition, since the bus bars 802U to 802W are routed to the side surface 12d that is an empty space without straddling the flow path 19, the insulation of the bus bars 802U to 802W can be improved. Moreover, since the distance between the connector portions of the bus bars 802U to 802W and the power modules 300U to 300W is increased, it is possible to reduce heat generated in the connector portion from being transferred to the power modules 300U to 300W.

  Further, the capacitor module 500, which is a heavy object, is stored in a storage space 405 that is formed at substantially the center of the flow path forming body 12 and is surrounded by the flow path 19, so that heat from the outside to the capacitor module 500 can be obtained. Intrusion can be prevented. Moreover, since a heavy object is arrange | positioned in the flow-path formation body 12, a gravity center balance becomes good and the rampage of the power converter device 200 when a vibration is added from the outside can be prevented. Furthermore, the connection relationship between the capacitor module 500 and the three power modules 300U to 300W can be made equal, and current can be taken in and out easily.

  Since the AC interface 185 connected to the three bus bars 802U to 802W is provided on the side surface 12d side, the cooling pipe connection points and the AC wiring connection points are integrated on the same surface, and can be compactly integrated. Further, the AC wiring 187a extends from the AC connector 187 connected to the AC interface 185 to the bottom surface direction of the flow path forming body 12 through the space between the refrigerant inlet (opening 1212g and the refrigerant outlet (opening 12h)). The AC connector 187 and the pipes 13 and 14 are arranged on the same side surface 12d, but the AC wiring 187a extends between the pipes 13 and 14 in the bottom direction. Therefore, workability is good and it is easy to route cooling piping and AC wiring.

  Further, since the current sensor module 180 is arranged so that the sensor elements for detecting the current flowing through the bus bars 802U to 802W are arranged along the extending direction of the side surface 12d, the low-voltage sensor signal line is connected to the high-voltage sensor signal line. Wiring can be performed away from the power modules 300U to 300W, and the influence of noise can be reduced.

  Each of the embodiments described above may be used alone or in combination. This is because the effects of the respective embodiments can be achieved independently or synergistically. In addition, the present invention is not limited to the above embodiment as long as the characteristics of the present invention are not impaired.

  8: lid, 10: housing, 12: flow path forming body, 12e, 12f: hole, 13: inlet pipe, 14: outlet pipe, 19: flow path, 19a to 19c: flow path section, 21: connector, 136: Battery: 137: DC interface, 138: DC connector, 140: inverter circuit, 150: series circuit, 180M: current sensor module, 185: AC interface, 187: AC connector, 200: power converter, 300, 300U to 300W, 301U to 301W: Power module, 405: Storage space, 420: Lower cover, 500: Capacitor module, 800: Bus bar assembly, 802, 802U to 802W: AC bus bar, MG1: Motor generator

Claims (5)

A semiconductor module that converts direct current into alternating current;
An AC bus bar for transmitting the AC current;
A holding member for holding the AC bus bar;
A driver circuit board having a driver circuit for driving the semiconductor module;
The power conversion device, wherein the holding member includes a support member that supports the driver circuit board. The power conversion device according to claim 1,
A current sensor module for detecting the alternating current flowing in the alternating current bus bar;
The holding member is a power conversion device that holds the current sensor module. The power conversion device according to claim 2,
The holding member has a through hole formed in the current sensor module and a protrusion that is engaged with a through hole formed in the driver circuit board. The power conversion device according to any one of claims 1 to 3,
A control circuit board having a control circuit for controlling the driver circuit;
Forming a storage space for storing the driver circuit board, and a metal housing having an outer wall on which the control circuit board is fixed and provided with an opening connected to the storage space;
The driver circuit board is a power converter connected to the control circuit board by a flat cable passing through the opening. The power conversion device according to any one of claims 1 to 4,
A flow path forming body in which a flow path for flowing a coolant for cooling the semiconductor module is formed;
The holding member is a power conversion device fixed to the flow path forming body.

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