JP2012120381A - Electric power conversion system and electric drive vehicle using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric power conversion system enabling sufficient cooling of circuit components, such as a capacitor and a power module, in a simple and small configuration and an electric drive vehicle using the electric power conversion system.SOLUTION: In an electric power conversion system 3, power modules 21, 22 having at least switching elements and converting DC power to AC power and a plurality of capacitors 26, 27 smoothing the DC power are disposed within a case body 6 having a sealed structure. The case body 6 comprises: two divided division case bodies 6L, 6H; and a flat plate-shaped liquid-cooled heat sink 7 interposed between the two division case bodies 6L, 6H to close division faces of the two division case bodies 6L, 6H and mounted with the power modules 21, 22. Gas flow passages 11, 12 communicating the two division case bodies 6L, 6H with each other are formed in the liquid-cooled heat sink 7.

Description

  The present invention relates to a power conversion device in which a power module that has at least a switching element and converts DC power to AC power and a plurality of smoothing capacitors that smooth DC power are arranged in a sealed housing, and the power converter It relates to the electric drive vehicle used.

In an electric drive vehicle such as an electric vehicle or a hybrid vehicle, a power conversion device configured by, for example, an inverter that converts DC power into AC power and drives an actuator such as an electric motor is used.
In this type of power conversion device, since DC power of several hundred volts is converted into AC power, heat generation of the power module and the smoothing capacitor constituting the power conversion device cannot be avoided, and at least the power module And it is necessary to cool the smoothing capacitor.

  As a conventional power conversion device, for each phase for generating a phase current of each phase of a boosting reactor and a motor / generator by making contact with one surface of a cooling plate having a coolant flow path therein A plurality of circuits including a switching unit, a boosting switching unit connected to the reactor, a pre-boosting smoothing capacitor that smoothes the voltage before boosting by the reactor, and a post-boosting smoothing capacitor that smoothes the voltage after boosting by the reactor There is known an inverter device in which a part of component parts is disposed and the rest is disposed in contact with the other surface of the cooling plate (see, for example, Patent Document 1).

JP 2007-89258 A

Here, in the conventional example described in Patent Document 1, a smoothing capacitor and a reactor are arranged on the upper side of a cooling plate having a cooling liquid flow path inside and covered with a cover body. A switching unit is arranged on the lower side, and this cooling plate is mounted so as to cover the upper surface of the inverter case.
For this reason, since the cooling capacitor, the reactor, and the heat generating components of the switching unit are cooled only by the cooling plate, there is no gas passage between the upper and lower sides of the cooling plate. Because the difference will occur, it is necessary to design the cooling capacity of the cooling plate according to the high temperature side, and some of the relatively high reactors and smoothing capacitors are in contact with the cooling plate. Therefore, there is an unsolved problem that the entire surface cannot be efficiently cooled.
Therefore, the present invention has been made paying attention to the above-mentioned unsolved problems of the conventional example, and power conversion capable of sufficiently cooling circuit components such as a capacitor and a power module with a simple and small configuration. It is an object of the present invention to provide an apparatus and an electrically driven vehicle using the same.

  In order to achieve the above object, a power converter according to an embodiment of the present invention includes a power module that has at least a switching element and converts DC power to AC power, and a plurality of capacitors that smooth the DC power. Is disposed in a sealed housing, and the housing is divided into two divided housings and the two divided housings interposed between the two divided housings. It is composed of a flat liquid-cooled heat sink that closes the dividing surface of the body and that is equipped with the power module, and a gas passage that communicates between the two divided housings is formed in the liquid-cooled heat sink. Yes.

  According to this configuration, the circuit components such as the power module and the capacitor can be cooled by the liquid cooling heat sink, and the gas flow path is formed in the liquid cooling heat sink so as to communicate between the divided housings. It is possible to circulate the gas between the divided housings through the air, and to suppress the temperature difference between the divided housings, and it is possible to cool the circuit components by the gas, thereby improving the cooling capacity. it can.

In the power conversion device according to another aspect of the present invention, the liquid-cooled heat sink includes a plurality of gas passages communicating between the two divided housings, and the capacitor is disposed in at least one gas passage. It is characterized by being comprised so that a part may be accommodated.
According to this configuration, when the gas is circulated through the gas passage of the liquid cooling heat sink, the entire surface of the capacitor can be cooled by the circulating gas, and the cooling efficiency of the capacitor can be improved.

In the power conversion device according to another aspect of the present invention, the liquid-cooled heat sink is formed with a plurality of gas passages communicating between the two divided housings, and the two divided gas passages are provided in at least one gas passage. A connection cable for connecting electrical components housed in the housing is inserted.
According to this configuration, the electrical connection between the circuit components arranged in two divided housings can be easily performed through the gas passage without forming a dedicated through hole or the like separately.

Further, in the power conversion device according to another aspect of the present invention, the liquid-cooled heat sink is characterized in that an outer peripheral surface is exposed to the outside, and a water supply port and a drain port are protruded from a part of the outer peripheral surface. It is said.
According to this configuration, the cooling medium supplied to the liquid cooling heat sink can be directly supplied / discharged without providing a connecting portion, the connection structure can be simplified, and liquid leakage in the housing can be reliably prevented. can do.

Moreover, the power converter device which concerns on the other form of this invention is characterized by the said cooling cooling heat sink being formed with the seal part in the outer periphery which contacts the said 2 division | segmentation housing | casing.
According to this configuration, the circuit component mounting surface of the liquid-cooled heat sink is formed with good flatness, so that a reliable sealing function can be obtained by forming a seal portion on the outer periphery with good flatness. it can.

Further, in the power conversion device according to another aspect of the present invention, the liquid-cooled heat sink includes the power module constituting the inverter and the chopper circuit on one divided housing side, and the chopper circuit on the other divided housing side. It is characterized by the arrangement of a reactor that constitutes it.
According to this configuration, a power module that generates a large amount of heat and a reactor that is a large component can be directly cooled by a liquid-cooled heat sink.

Moreover, the power converter device which concerns on the other form of this invention is characterized by the said liquid cooling heat sink having arrange | positioned the cooling fin for heat exchange in the mounting surface which has arrange | positioned the said reactor.
According to this configuration, the large heat exchange cooling fins are juxtaposed with the reactor, so that the passage of gas is blocked in the reactor, so that when the gas is circulated, the gas passes through the heat exchange cooling fins. The circulating gas can be efficiently cooled.

An electric drive vehicle according to an aspect of the present invention is characterized in that the electric motor for traveling is controlled using the power conversion device according to any one of claims 1 to 7. Yes.
According to this configuration, since the electric motor for traveling of the electrically driven vehicle is controlled using the power conversion device having the above effects, heat generation in the power conversion device can be suppressed and stable traveling can be ensured.

According to the present invention, the housing is divided into two divided housings, and a liquid-cooled heat sink is interposed between the two divided housings, and the two divided housings communicate with each other. Since the gas passage to be formed is formed, gas can be circulated between the two divided housings, a temperature difference between the two divided housings can be suppressed, and the cooling effect can be improved. .
In addition, by circulating the gas between the divided housings via the gas passage, the cooling effect by the liquid cooling heat sink and the cooling effect by the circulating gas can be obtained, and the cooling effect can be improved.
At this time, the cooling effect can be further improved by providing heat exchange cooling fins fixed to the liquid cooling heat sink in the gas circulation path.
Moreover, the electric drive vehicle with high durability of a control apparatus can be provided by controlling the electric motor for driving | running | working using the power converter device which has the said effect.

1 is a schematic configuration diagram showing an embodiment of an electrically driven vehicle to which the present invention can be applied. It is a typical longitudinal cross-sectional view of the state which removed the front plate part which shows a power converter device. It is sectional drawing on the AA line of FIG. It is sectional drawing on the BB line of FIG. It is a top view which shows a water cooling heat sink. It is a bottom view of a water cooling heat sink. It is a cross-sectional view of a water-cooled heat sink. It is sectional drawing on the CC line of FIG. It is sectional drawing which shows the decomposition | disassembly state of a power converter device. It is explanatory drawing which shows the connection structure of an upper case and a lower case, and a water-cooled heat sink, (a) is sectional drawing, (b) is an exploded sectional view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a schematic configuration when the present invention is applied to an electric vehicle as an electrically driven vehicle.
In the figure, reference numeral 1 denotes an electric vehicle. The electric vehicle 1 is provided with, for example, an electric motor 2 for driving the front end on the front side of the vehicle, and constitutes a drive device for driving the electric motor 2. A power conversion device 3 and a vehicle control device 4 that supplies a control signal to the power conversion device 3 are arranged, and further stores a large number of storage batteries that supply power to the power conversion device 3 and the vehicle control device 4. A storage battery storage 5 is provided.

  As shown in FIGS. 2 to 5, the power conversion device 3 includes a casing 6 having a rectangular parallelepiped liquid-tightness. The casing 6 includes a box-shaped lower divided casing 6L that is divided into two parts in the upper and lower directions, an open upper end, a rectangular tube-shaped upper divided casing 6H that is open at the upper and lower ends, a lower divided casing 6L, and an upper section. It is composed of, for example, a water-cooled liquid-cooled heat sink 7 formed in a flat plate shape having a predetermined thickness that closes both divided surfaces interposed between the divided housings 6H. Here, the upper divided housing 6 </ b> H is closed at the upper end by the lid 8.

As shown in FIGS. 5 to 8, the liquid-cooled heat sink 7 is formed in a flat rectangular parallelepiped shape having a predetermined thickness, and has a gas passage 11 that is relatively narrow on the front end side and extends to the vicinity of both end portions in the left-right direction. A gas passage 12 is formed so as to penetrate vertically, and a gas passage 12 that is wider than the gas passage 11 and extends in the left-right direction to the vicinity of both end portions is vertically penetrated.
A cooling water supply port 13 and a cooling water discharge port 14 to which cooling water serving as a cooling medium is supplied project from the front end surface of the liquid cooling sheet sink 7. Further, as shown in FIGS. 7 and 8, a cooling water reservoir 15 communicating with the cooling water supply port 13 is formed in the liquid cooling heat sink 7 so as to extend in the front-rear direction between the gas passages 11 and 12. In addition, a cooling water reservoir 16 communicating with the cooling water discharge port 14 is formed to extend in the front-rear direction between the gas passages 11 and 12 so as to face the cooling water reservoir 15. Further, a large number of cooling water insertion grooves 17 having a small cross-sectional area extending in the left-right direction are formed between the cooling water reservoirs 15 and 16.

  Thus, by forming the cooling water reservoir 15 at least on the cooling water supply port 13 side of the large number of cooling water insertion grooves 17, the sectional area of the cooling water insertion groove 17 is small and the pipe resistance is large. When the pressure increases, the cooling water can be evenly distributed to the cooling water insertion grooves 17. Although not shown, the electric vehicle 1 includes a heat exchanger such as a radiator provided on the front surface of the electric vehicle 1 for cooling the cooled cooling water discharged from the cooling water discharge port 14, and the heat exchanger. And a cooling system that stores the cooling water cooled in step 1 and a cooling system that pressurizes the cooling water stored in the reservoir tank with a pump and supplies the cooling water to the cooling water supply port 13.

  As shown in FIG. 5, on the upper surface of the liquid cooling heat sink 7 facing the cooling water insertion groove 17, as a power module constituting a chopper circuit for stepping up and down the DC power of the DC power source constituted by the storage battery described above. A direction in which the IGBT module 21 and three IGBT modules 22 as power modules constituting an inverter that converts DC power output from the chopper circuit into, for example, three-phase AC power are orthogonal to the extending direction of the cooling water insertion groove 17 Are arranged in parallel at a predetermined interval. Here, the IGBT modules 21 and 22 incorporate an IGBT (Insulated Gate Bipolar Transistor) as a switching element connected in series, a protection circuit, and the like.

  Further, on the lower surface of the liquid cooling heat sink 7 facing the cooling water insertion groove 17, as shown in FIG. 6, a relatively large cubic reactor 23 constituting the chopper circuit described above is provided on the cooling water discharge port 14 side. The heat dissipating fins 24 are disposed on the cooling water supply port 13 side adjacent to the reactor 23 and are further cooled by the heat dissipating fins 24 provided on the gas passage 12 side of the heat dissipating fins 24. A blower fan 25 with a louver that blows cooling air to the gas passage 12 side is disposed.

Further, the capacitor 26 constituting the chopper circuit and the three smoothing capacitors 27 inserted between the chopper circuit and the inverter are connected to the gas passage 12 of the liquid-cooled heat sink 7 at the terminal side thereof as shown in FIG. It is fixed to the lower divided housing 6L in a state of being inserted with a predetermined interval without contacting the inside.
And the IGBT module 21 arrange | positioned at the upper surface of the liquid cooling heat sink 7 which comprises a chopper circuit, and the reactor 23 arrange | positioned at the lower surface of the liquid cooling heat sink 7 are electrically connected through the gas passage 12, as shown in FIG. They are electrically connected by a cable 28.

On the other hand, above the IGBT modules 21 and 22 fixed to the liquid cooling heat sink 7, as shown in FIGS. 2 and 3, a gate driving circuit for controlling the gates of the IGBTs built in the IGBT modules 21 and 22, etc. A control board 31 on which a control circuit is mounted and a power board 32 on which a power circuit, a relay and the like are mounted are arranged in parallel.
Each of the control board 31 and the power supply board 32 is supported by a support member 33 fixed to the inner peripheral surface of the upper divided housing 6H. The support member 33 includes a plurality of L-shaped fixing brackets 34 fixed to the front, rear, left and right inner walls of the upper divided housing 6H, and a metal plate supported by the fixing bracket 34 or a thick glass-filled epoxy resin or the like. The support substrate 35 having high rigidity and a plurality of spacers 36 each planted at the front and rear end portions and the center portion in the front and rear direction on the upper surface of the support substrate 35 are configured. Here, as shown in FIG. 2, the spacer 36 has a cylindrical portion 36a having a female threaded portion at the head, and a mounting hole 37 formed in the support substrate 35 projecting downward from the lower end surface of the cylindrical portion 36a. It is comprised by the support protrusion 36b penetrated in.

  The control board 31 and the power supply board 32 are individually placed on the upper end of the spacer 36, and the mounting screw 39 is inserted into the screw insertion hole 38 formed in the control board 31 and the power supply board 32 so as to face the spacer 36. Then, the control board 31 and the power supply board 32 are screwed and fixed onto the spacer 36 by being screwed into the female thread portion of the spacer 36. Therefore, the control board 31 and the power supply board 32 that are provided in a predetermined space between the support board 35 and the control board 31 and the power supply board 32 and are thin and easily bent are held without being bent by the support board 35 having high rigidity. can do.

  Further, a blower fan 40 facing the control board 31 and the power supply board 32 is disposed at a position facing the gas passage 12 on the right inner wall of the upper divided housing 6H. The blower fan 40 has an air suction opening opened below the right inner wall side of the upper divided housing 6H, sucks cooling air supplied from the gas passage 12 by the blower fan 25, and is disposed on the front surface (not shown). Cooling air is distributed and blown by the louver so as to reach the gas passage 11 side through the control board 31 and the power supply board 32 and the support board 35.

  Further, the lower divided casing 6L, the liquid cooling heat sink 7, the upper divided casing 6H, and the lid body 8 are sealed by a connecting structure 45 having a sealing member, and the casing 6 is sealed. That is, as shown in FIG. 10, the connecting structure 45 is formed with a flange portion 46 formed inwardly extending at the upper end portion of the lower divided housing 6 </ b> L, and an inner surface formed on the upper surface of the flange portion 46. A cylindrical portion 47 having a female threaded portion on the peripheral surface, a rectangular annular packing 48 having a height higher than that of the cylindrical portion 47 mounted on the outer peripheral surface of the cylindrical portion 47, and an inner surface on the lower end side of the upper divided housing 6H A fixing member 49 having an L-shaped bolt insertion hole 49a extending inwardly fixed thereto, and a bolt insertion hole 49a attached to the lower side of the bolt insertion hole 49a of the fixing member 49 is slightly larger. From the cylindrical portion 49 b in which the insertion hole 50 a is formed on the inner peripheral surface, the square annular packing 50 having a height higher than the cylindrical portion 49 b mounted on the outer peripheral surface of the cylindrical portion 49 b, and the upper end side of the fixing member 49 Liquid cooled heat sink inserted And a mounting bolt 51 that is screwed into the female screw portion of the cylindrical portion 47 through the through hole 7a formed in the. Similarly, a flange portion 52 that extends inward is formed at the upper end of the upper divided housing 6H, and a circumferential flange 53 that extends slightly upward is formed at the inner end of the flange portion 52. Further, a flange portion 54 extending downward from the outer peripheral edge is formed on the lid body 8, and an annular packing 55 is attached to the inside of the flange portion 54. The packing 55 is formed with a circumferential groove 56 through which the circumferential flange 53 of the upper divided housing 6H is inserted. Then, the packing body 55 of the lid body 8 comes into contact with the flange portion 52 of the upper divided housing 6H, and the lid body 8 is attached to the upper divided housing 6H so that the circumferential collar 53 is inserted into the circumferential groove 56. From the upper side of the lid 8, it is fastened and fixed with a mounting bolt (not shown). At this time, the mounting bolt is screwed into a cylindrical portion (not shown, but formed on the upper divided housing 6H) having a female screw portion.

Next, the operation of the above embodiment will be described.
As shown in FIG. 9, the liquid-cooled heat sink 7, the lower divided housing 6L, and the upper divided housing 6H are separated, and the lid 8 is separated from the upper divided housing 6H. To do. In this state, the IGBT module 21 and 22 are mounted on the upper surface of the liquid-cooled heat sink 7 as described above, and the reactor 23, the radiating fin 24, and the blower fan 25 are mounted on the lower surface. Similarly, capacitors 26 and 27 are fixedly placed on the lower divided housing 6L.

  In this state, the liquid cooling heat sink 7 is placed on the lower divided housing 6L, and the upper divided housing 6H is placed on the liquid cooling heat sink 7. In this state, as shown in FIG. 10A, the internal thread portion of the cylindrical portion 47 of the lower divided housing 6L, the through hole 7a of the liquid cooling heat sink 7, the insertion hole 50a of the cylindrical portion 49b, and the insertion hole 49a of the fixing member 49. In this state, the mounting bolt 51 is inserted from the upper side of the fixing member 49 of the upper divided housing 6H, and is screwed into the female thread portion of the cylindrical portion 47 to be tightened. The divided housing 6L, the liquid-cooled heat sink 7 and the upper divided housing 6H can be connected in a liquid-tight state.

  In this state, the electrical connection cable 28 having one end connected to the reactor 23 is connected to the connection terminal of the IGBT module 21, and the capacitors 26 and 27 and the IGBT modules 21 and 22 are electrically connected to each other, and then the lower fixing is performed. The bracket 34 is fixed to the inner wall of the upper divided housing 6H, and then the support substrate 35 to which the spacer 36 is fixed is fixed to the fixing bracket 34 by screwing or the like. Next, the control board 31 is mounted on the spacer 36 of the support board 35 and fixed by screwing. Thereafter, the blower fan 40 is fixed to the rear end side of the right inner wall of the upper divided housing 6H, the upper fixing bracket 34 is fixed to the inner wall of the upper divided housing 6H, and then the support substrate 35 to which the spacer 36 is fixed is attached. The fixing bracket 34 is fixed by screwing or the like. Next, the power supply substrate 32 is mounted on the spacer 36 of the support substrate 35 and fixed.

The electrical connection between the control board 31 and the IGBT modules 21 and 22 and the electrical connection between the control board 31 and the power supply board 32 are not shown, but the outer end of each board (between each board and the housing 6H). Through space).
When the mounting of the power supply substrate 32 is completed, the upper divided housing 6H and the lid body 8 are sealed with the packing 55 by attaching the lid body 8 to the upper surface of the upper divided housing 6H and tightening the bolts. The power conversion device 3 is configured by connecting in a dense state.

  The power conversion device 3 is mounted on the electric vehicle 1, and the cooling water supply port 13 and the cooling water discharge port 14 of the liquid cooling heat sink 7 are connected to the cooling system mounted on the electric vehicle 1, thereby cooling water from the cooling system. Is supplied to the cooling water supply port 13 and the cooled cooling water discharged from the cooling water discharge port 14 is returned to the cooling system. At this time, the cooling water supply port 13 and the cooling water discharge port 14 of the liquid cooling heat sink 7 are directly exposed to the outside, so that the connection with the cooling system can be easily performed, and the housing at the time of the connection The liquid tightness of 6 is not lost, and it is possible to reliably prevent the cooling water from leaking into the housing 6.

Then, when the ignition switch of the electric vehicle 1 is turned on, the power conversion device 3 is activated, and the accelerator pedal or the like is operated, whereby a control command is input from the vehicle control device 4, thereby Conversion is started, and three-phase power corresponding to the control command is supplied to the electric motor 2.
As described above, when the power conversion device 3 is activated, each circuit component generates heat. In particular, the IGBT modules 21 and 22 and the reactor 23 that generate a large amount of heat are directly contacted and fixed to the liquid-cooled heat sink 7. Therefore, it is cooled by the cooling water flowing through the liquid cooling heat sink 7.

In addition to this, on the lower surface of the liquid cooling heat sink 7, a radiating fin 24 is disposed on the cooling water supply port 13 side in the vicinity of the reactor 23, and a blower fan 25 is disposed on the gas passage 12 side of the radiating fin 24. Therefore, the low temperature of the liquid-cooled heat sink 7 is conducted to the heat radiating fins 24, and the air trapped in the housing 6 is cooled by the heat radiating fins 24.
Then, the cooled air is dispersed and blown to the capacitors 26 and 27 as cooling air by the louver of the blower fan 25, and the capacitors 26 and 27 are cooled. At this time, as shown in FIG. 3, the condensers 26 and 27 are inserted through the gas passage 12 of the liquid-cooled heat sink 7 at a predetermined interval in the front-rear direction, so that the cooling air is supplied to all the condensers 26 and 27. The side surface can be cooled and the cooling effect of the capacitors 26 and 27 can be improved.

  A blower fan 40 is also provided above the gas passage 12 on the upper surface side of the liquid-cooled heat sink 7, and the blower fan 40 allows the capacitors 26 and 27 to be connected from the lower surface side of the right side wall of the upper divided housing 6H. The cooled cooling air is taken in, and the cooling air is dispersed and blown into the space between the control board 31 and the power supply board 32 and the support board 35, the lower part of the control board 31 and the upper side of the power supply board 32 by the louver. The cooling air cools the heat generating components mounted on the control board 31 and the power supply board 32, and cools the IGBT modules 21 and 22, and the cooling air after cooling them passes through the gas passage 11 to the radiating fins 24. A cooling air circulation path is formed which is cooled back and cooled and blown again to the capacitors 26 and 27 by the blower fan 25.

  Thus, according to the above-described embodiment, the lower divided housing 6L and the upper divided housing 6H are connected via the liquid cooling heat sink 7, and the IGBT modules 21 and 22 and the reactor 23 serving as heat-generating components are connected by the liquid cooling heat sink 7. Can be cooled directly. At this time, the lower divided housing 6L and the upper divided housing 6H are divided by the liquid cooling heat sink 7. By forming the gas passages 11 and 12 spaced apart from the liquid cooling heat sink 7 by a predetermined distance, the lower divided housing 6L is formed. In addition, gas can flow in and out through the gas passages 11 and 12 between the upper divided housing 6H, and a temperature difference between the lower divided housing 6L and the upper divided housing 6H can be prevented.

  Moreover, the cooling air can be formed by mounting the radiating fins 24 on the liquid-cooled heat sink 7 and disposing the blower fan 25 on the radiating fins 24. Thus, a cooling air circulation path for forcibly circulating the cooling air can be formed, and the internal temperature of the housing 6 can be averaged evenly. For this reason, it is possible to improve the degree of freedom of the layout of the heat generating components, and it is not necessary to make a space for heat dissipation, and the whole can be downsized. At this time, since the radiation fins 24 are provided on the cooling water supply port 13 side, the air cooling effect can be further enhanced.

In addition, the upper and lower surfaces of the liquid-cooled heat sink are finished with high flatness in order to increase the contact area between the lower-divided casing 6L and the upper-divided casing 6H and the liquid-cooled heat sink 7 and increase the contact area with the heat generating component. Since it is connected via 50, highly accurate liquid tightness can be obtained.
In addition, since a part of the capacitors 26 and 27 is inserted into the gas passage 12, the height of the lower divided housing 6L can be reduced by this amount, and the entire power conversion device 3 can be downsized. it can. Similarly, since the IGBT module 21 constituting the chopper circuit via the gas passage 12 and the reactor 23 are connected by the electric connection cable 28, an insertion portion for inserting the electric connection cable is formed separately. There is no need to do.

  Furthermore, since the control board 31 and the power supply board 32 having low rigidity are each supported by the support board 35 having high rigidity via the spacers 36, when there is a lot of vibration transmitted from the vehicle body like the electric vehicle 1, It is possible to prevent the control board 31 and the power supply board 32 from being bent due to vibration, and the mounted electrical components are damaged due to repeated stress caused by the bending of the control board 31 and the power supply board 32, or the control board 31 and the power supply board 32 are supplied. It is possible to reliably prevent the soldering portion that electrically connects the substrate 32 and the electrical component to be mounted from being damaged and causing a contact failure.

Moreover, by mounting the power conversion device 3 having the above-described effect, it is possible to provide a highly durable electric vehicle regardless of a temperature change due to a traveling environment.
In addition, in the said embodiment, although the case where the gas passages 11 and 12 were formed by one long hole extended in the left-right direction was demonstrated, it is not limited to this and each gas passage 11 and 12 is made to extend in the extension direction. It can also be divided and formed. Further, the gas passage 12 can be formed only on the lower side of the blower fan 40 when the capacitors 26 and 27 are not inserted. In addition, the number of gas passages is not limited to two, and three or more gas passages may be formed.

Furthermore, the number of substrates such as the control substrate 31 and the power supply substrate 32 disposed in the upper divided housing 6H is not limited to two and can be any number.
Similarly, the number of IGBT modules 21 and 22 and capacitors 26 and 27 can be arbitrarily set, and the number of AC phases for power conversion can be arbitrarily changed according to the number of phases of the electric motor to be used.

  In the above-described embodiment, the case where the cooling water is applied as the cooling medium has been described. However, the present invention is not limited to this, and alternative fluorocarbons such as hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) Cooling media such as other cooling gases and cooling liquids can be applied. In this case, when using an alternative chlorofluorocarbon, the alternative chlorofluorocarbon used in the air conditioner can be branched and used.

Moreover, although the said embodiment demonstrated the case where the IGBT module incorporating IGBT was applied as a power module, it is not limited to this, The power module incorporating MOSFET and another power semiconductor element is applied Can do.
Furthermore, in the said embodiment, although the case where the power converter device by this invention was applied to the electric vehicle was demonstrated, it is not limited to this, It can apply this invention also to the rail vehicle which drive | works a rail. It can be applied to any electric drive vehicle, and the power conversion device is not limited to the electric drive vehicle, and the power conversion device of the present invention is applied when driving an actuator such as an electric motor in other industrial equipment. can do.

  DESCRIPTION OF SYMBOLS 1 ... Electric vehicle, 2 ... Electric motor, 3 ... Power converter device, 4 ... Vehicle control apparatus, 5 ... Storage battery storage part, 6 ... Case, 6L ... Lower division case, 6H ... Upper division case, 7 ... Liquid Cold heat sink, 8 ... Lid, 11, 12 ... Gas passage, 13 ... Cooling water supply port, 14 ... Cooling water discharge port, 21, 22 ... IGBT module, 24 ... Reactor, 25 ... Blower fan, 26, 27 ... Condenser 28 ... Electric connection cable 31 ... Control board 32 ... Power supply board 33 ... Support member 34 ... Fixing bracket 35 ... Support board 36 ... Spacer 40 ... Blower fan 45 ... Connection structure 46 ... Flange part 47 ... Cylindrical part, 48 ... Packing, 49 ... Fixed support part, 50 ... Packing, 51 ... Mounting bolt

Claims (8)

A power conversion device in which a power module that has at least a switching element and converts DC power into AC power and a plurality of capacitors that smooth the DC power are arranged in a sealed housing.
The housing is divided into two, a flat housing that is interposed between the two divided housings, closes the divided surfaces of the two divided housings, and is mounted with the power module. The liquid-cooled heat sink
A power conversion device, wherein a gas passage communicating between the two divided housings is formed in the liquid cooling heat sink.   The liquid-cooled heat sink has a plurality of gas passages communicating with the two divided housings, and is configured to accommodate a part of the capacitor in at least one gas passage. The power conversion device according to claim 1.   In the liquid-cooled heat sink, a plurality of gas passages communicating with the two divided housings are formed, and a connection cable for connecting an electrical component accommodated in the two divided housings is inserted into at least one gas passage. The power converter according to claim 1, wherein the power converter is provided.   2. The power conversion device according to claim 1, wherein an outer peripheral surface of the liquid-cooled heat sink is exposed to the outside, and a water supply port and a drain port are protruded from a part of the outer peripheral surface.   The power converter according to claim 1, wherein the liquid-cooled heat sink has a seal portion formed on an outer peripheral edge that contacts the two divided housings.   The liquid-cooled heat sink is characterized in that the power module constituting the inverter and the chopper circuit is arranged on one divided housing side, and the reactor constituting the chopper circuit is arranged on the other divided housing side. The power conversion device according to any one of 1 to 5.   The power conversion device according to claim 6, wherein the liquid-cooled heat sink has heat exchange cooling fins arranged on a mounting surface on which the reactor is disposed.   An electric drive vehicle characterized in that the electric motor for traveling is controlled using the power conversion device according to any one of claims 1 to 7.

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