JP2012105426A - Power converter and electrically driven vehicle using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power converter capable of sufficiently cooling a capacitor and a power module, and an electrically driven vehicle using it.SOLUTION: A power converter 6 includes: a power module 21 which has a switching element and converts DC power to multi-phase AC power; and a plurality of capacitors 22 which smooth the DC power. The power converter 6 is provided with: a heat sink 23 for the power module on which the power module 21 is mounted; and a cooling part 30 for the capacitor fixed to the heat sink 23 for the power module, for mounting the capacitors 22 and cooling them with cold air.

Description

  The present invention relates to a power conversion device including a power module that has a switching element and converts DC power to multiphase AC power, and a plurality of smoothing capacitors that smooth DC power, and an electric drive using the same Regarding vehicles.

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 multiphase 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 to multiphase AC power, heat generation of the power module and the smoothing capacitor constituting the power conversion device cannot be avoided, and at least power It is necessary to cool the module and the smoothing capacitor.
A conventional power conversion device includes an IPM (Intelligent Power Module) that is a power module, a DC / DC converter, a reactor, a control board, and a capacitor, and includes a cooling mechanism that cools these components. An apparatus has been proposed (see, for example, Patent Document 1).

  The cooling mechanism of the power conversion device includes a first cooler and a second cooler arranged at predetermined intervals in the vertical direction, and the first radiator and the second cooler are connected by the first radiator and the second radiator. It has been configured. The cooling water is circulated through the first cooler, the first radiator, the second cooler, and the second radiator. In this cooling mechanism, the IPM, the control board and the condenser are arranged between the first cooler and the second cooler, and the DC / DC converter and the reactor are arranged on the upper surface of the first cooler, thereby cooling each component. To do.

JP 2009-27901 A

  Here, in the conventional example described in Patent Document 1, the first and second coolers arranged above and below are connected by the first radiator and the second radiator, The reactor, the DC / DC converter, and the IPM are cooled by sending the cooling water cooled by one radiator to the first cooler. And the cooling water after heat exchange is cooled with a 2nd radiator, and it supplies to a 2nd cooler and cools a capacitor | condenser.

However, in the above conventional example, the outside air supplied to the first radiator passes through the second radiator and is supplied to the first radiator while being heated by the heat generated by the IPM and the capacitor. The cooling capacity of the radiator has to be low, and the temperature of the outside air passing over the condenser is not low until it is air-cooled. Therefore, there is an unsolved problem that the condenser as a heating element cannot be sufficiently cooled.
Accordingly, the present invention has been made paying attention to the unsolved problems of the above-described conventional example, and provides a power conversion device capable of sufficiently cooling a capacitor and a power module, and an electric drive vehicle using the same. The purpose is to do.

In order to achieve the above object, a power conversion device according to an embodiment of the present invention includes a switching module, a power module that converts DC power into multiphase AC power, and a plurality of DC power smoothing units. A power module heat sink equipped with the power module, and a condenser cooling section for mounting the capacitor fixed to the power module heat sink and cooling it with cold air. It is characterized by having.
According to this configuration, the power module is cooled with a cooling medium by the power module heat sink, and the capacitor is cooled by cold air by the condenser cooling unit, so that the capacitor can be cooled by the dedicated cooling unit, and the cooling capacity of the capacitor can be increased. Can be improved.

In the power converter according to another aspect of the present invention, the heat sink for the power module is disposed between the cooling medium supply port and the cooling medium discharge port in a housing in which a cooling medium supply port and a cooling medium discharge port are formed. It has the structure which formed the cooling-medium channel | path which has many cooling-medium passage grooves connected to this.
According to this configuration, since the cooling medium supplied from the cooling medium supply port is discharged from the cooling medium discharge port through the cooling medium passage having the plurality of cooling medium passage grooves, the surface area in contact with the cooling medium can be increased. The cooling efficiency of the heat sink can be improved. At this time, by arranging the cooling medium supply port and the cooling medium discharge port at one end of the heat sink for the power module, the cooling medium passage can be formed in the forward path and the return path. For this reason, the cross-sectional area of the cooling medium passage can be reduced, and the flow of the cooling medium flowing through the cooling medium passage groove can be made uniform.

Further, in the power conversion device according to another aspect of the present invention, the cooling unit for the capacitor aligns the plurality of capacitors at intervals in the longitudinal direction as a direction intersecting the longitudinal direction, and forms a cooling air passage. And a cooling mechanism composed of a radiator and an air cooling fan that are supplied with a cooling medium disposed in an opening at one end of the supporting cylinder portion. .
According to this configuration, the cooling mechanism cools the condenser by supplying the cooling air cooled by the radiator to the plurality of condensers by the air cooling fan, so that the cooling efficiency of the condenser can be improved.

Moreover, the power converter device which concerns on the other form of this invention is characterized by the said support cylinder part being attached to the opposite side to the mounting surface of the said power module of the said heat sink for power modules.
According to this structure, since the support cylinder part which supports a capacitor | condenser is attached to the heat sink for power modules, the cooling effect by the heat sink for power modules can be enjoyed, and the cooling capacity of a capacitor | condenser can be improved more.

Moreover, the power converter device which concerns on the other form of this invention is characterized by the said air cooling fan being inserted between the said radiator and the opening part of the said cylinder.
According to this configuration, since the air cooling fan is inserted on the rear stage side of the radiator, the air cooled by the radiator is blown by the air cooling fan, and the air cooling fan is not directly exposed to the outside air. The durability of can be improved.

In the power conversion device according to another aspect of the present invention, the radiator includes a cooling medium supply port and a cooling medium discharge port for supplying cooling water to the power module heat sink and the power module. It is connected to a branch portion provided in a cooling medium discharge pipe for discharging the cooling medium from the heat sink.
According to this configuration, the cooling water for the heat sink for the power module and the cooling medium supplied to the radiator can be supplied and discharged by the common cooling medium supply pipe and the cooling medium discharge pipe, and the cooling medium can be supplied from one cooling medium supply source. Can be supplied and discharged.

Moreover, the power converter device which concerns on the other form of this invention controlled the electric motor for driving | running | working using the power converter device as described in any one of the said Claim 1 thru | or 6 characterized by the above-mentioned. 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.

Further, in the electric drive vehicle according to another aspect of the present invention, the power conversion device is arranged in parallel with a charging device having a charging circuit mounted in a control device casing, and the cooling air exhausted from the condenser cooling unit is A cooling medium circulation passage is formed in which the charging device is cooled and then returned to the condenser cooling section.
According to this configuration, the power conversion device can cover the cooling of the other charging device, and the cooling mechanism can be simplified.

According to the present invention, the power module is cooled by the power module heat sink, and the condenser is cooled by the cold air in the condenser cooling section. Therefore, the power module and the condenser can be individually cooled, and the condenser is insufficiently cooled. It can be surely prevented.
Here, the condenser cooling section is constituted by a support cylinder that supports the condenser, and a cooling mechanism having a radiator and an air cooling fan provided at an opening at one end of the support cylinder, so that the condenser is cooled with cooling water. Air cooling can be performed with the cooled cold air, and the cooling capacity of the condenser can be improved.
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 cross-sectional view which shows a control apparatus. It is a typical longitudinal cross-sectional view which shows a control apparatus. It is the perspective view seen from diagonally upward of a power converter device. It is the perspective view seen from the slanting lower part of a power converter device. It is an expansion perspective view which shows the water supply / drainage part of a power converter device. It is a figure which shows the heat sink for power modules, Comprising: (a) is an external appearance perspective view, (b) is the perspective view made into the cross section. It is a figure which shows a radiator, Comprising: (a) is a front view, (b) is a side view. It is a schematic block diagram which shows the cooling part for capacitors, Comprising: (a) is sectional drawing, (b) is a side 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 drive bus as an electric drive vehicle.
In the figure, reference numeral 1 denotes an electric drive bus. The electric drive bus 1 is provided with, for example, a storage battery storage portion 2 for storing a large number of storage batteries on the rear side of the vehicle, and is controlled on the upper side of the storage battery storage portion 2, for example. A device 3 is arranged.

As shown in FIGS. 2 and 3, the control device 3 includes a control device housing 4 having a rectangular parallelepiped liquid-tightness. In the control device casing 4, a charging device 5 and a power conversion device 6 are arranged in the front and rear, and a board storage portion 7 is arranged on the right side of the charging device 5 and the power conversion device 6.
The charging device 5 includes a charging circuit 11 for charging a storage battery stored in the storage battery storage unit 2. The charging circuit 11 is provided with a charging resistor 12 that prevents overcurrent during charging, a power supply relay 13 for charging, and a fuse 14.

  As shown in FIGS. 2 to 6, the power conversion device 6 includes six IGBT modules 21 as power modules that convert DC power into three-phase AC power, and a DC connected to the input side of these IGBT modules 21. And six columnar capacitors 22 for smoothing the electric power. The IGBT module 21 includes an IGBT (Insulated Gate Bipolar Transistor) as a switching element connected in series, a protection circuit, and the like.

The six IGBT modules 21 are arranged in the axial direction on the upper surface of a flat rectangular parallelepiped power module heat sink 23 corresponding to the U-phase, V-phase, and W-phase of three-phase AC power. Are mounted at predetermined intervals.
As shown in FIG. 3, a support substrate 27 is disposed on the upper surface of the IGBT module 21, and a gate drive circuit (GDU) that drives the gate of the IGBT in the IGBT module 21 with a predetermined interval above the support substrate 27. : A gate drive unit) and a drive board 28 on which an interface (I / F) circuit is mounted is supported by a support 29.
The six capacitors 22 are supported by a capacitor cooling unit 30 fixed to the lower surface of the power module heat sink 23.

  The power module heat sink 23 is made of aluminum, aluminum alloy or the like having high thermal conductivity. As shown in FIGS. 7A and 7B, the power module heat sink 23 has a cooling water supply port 23a through which cooling water as a cooling medium is supplied to one end in the longitudinal direction and cooling for discharging the cooling water. A water discharge port 23b is provided in parallel, and an outward water passage 23d and a return water passage 23e are formed as cooling medium passages partitioned by a partition plate 23c in a direction orthogonal to the longitudinal direction. In the forward water passage 23d, a cooling water reservoir 23f is formed inside the cooling water supply port 23a, and a water passage groove 23g as a cooling medium passage groove that communicates with the cooling water reservoir 23f and extends in the longitudinal direction on the other end side is predetermined. A large number are formed at intervals, and a cooling water pool 23h is formed on the rear end side of these water flow grooves 23g. The return water passage 23e has the same configuration as that of the forward water passage 23d, a cooling water reservoir 23i is formed inside the cooling water discharge port 23b, and water passage grooves as a number of cooling medium passage grooves communicating with the cooling water reservoir 23i. 23j is formed, and a cooling water reservoir 23k communicating with the cooling water dripping space 23h is formed on the rear end side of the water flow groove 23j.

  As described above, since a large number of water grooves 23j are formed extending in the longitudinal direction in each of the forward water passage 23d and the backward water passage 23e, the surface area in contact with the cooling water is increased, so that the cooling efficiency is improved. Can be made. Moreover, both the forward water passage 23d and the return water passage 23e are formed with cooling water reservoirs 23f and 23k on the cooling water inlet side of the numerous water grooves 23g and 23j. For this reason, since the conduit resistance of the water flow grooves 23g and 23j is large, the cooling water accumulates in the cooling water pool 23f before entering the water flow grooves 23g and 23j and then enters the water flow grooves 23g and 23j. Cooling water can flow evenly through the water grooves 23g and 23j.

The cooling water supply pipe 24 is connected to the cooling water supply opening 23a of the power module heat sink 23, and the cooling water discharge pipe 25 is connected to the cooling water discharge opening 23b. The other ends of the cooling water supply pipe 24 and the cooling water discharge pipe 25 are connected to a cooling water supply source 26 that protrudes from the control device housing 4 and is disposed on the vehicle body side.
In addition, the condenser cooling unit 30 has a pair of side plate portions 31a and 31b arranged at a predetermined distance apart from each other and a bottom plate portion 31c connecting the bottom surfaces of the pair of side plate portions 31a and 31b to open the upper end. It has a bowl-shaped body 31 as a support tube portion extending along the longitudinal direction of the heat sink 23 for use. The flange 31 is formed with flange portions 31d and 31e extending outward from the open upper ends of the side plate portions 31a and 31b. These flange portions 31d and 31e are screwed to the lower surface side of the power module heat sink 23, that is, the surface opposite to the upper surface on which the IGBT module 21 is placed. As a result, as shown in FIG. 9A, the cooling air passage 32 having a substantially square cross section surrounded by the left and right side plate portions 31a and 31b, the bottom plate portion 31c and the bottom surface of the power module heat sink 23 is formed. ing.

  An insertion hole 31f for inserting the capacitor 22 is formed in one side plate portion 31a of the bowl-shaped body 31 at a predetermined interval in the longitudinal direction. On the other hand, each capacitor 22 is provided with a fixing band 33 on the connection terminal 22a side. As shown in FIGS. 4, 5, and 9A, the fixing band 33 includes a band portion 33a in which a part of the circumference along the outer peripheral surface of the capacitor 22 is opened in the axial direction, and the band portion. A pair of flange portions 33b and 33c formed in the open portion of 33a, a predetermined number of, for example, three fixing protrusions 33d formed on the side of the flange-shaped body 31 of the band portion 33a, and a screw 33e for tightening the flange portions 33b and 33c And a nut 33f.

Then, the capacitor 22 is fixed to the bowl-shaped body 31 as follows.
That is, with the fixing band 33 attached to the outer peripheral surface of the capacitor 22 on the connection terminal 22a side, the capacitor 22 is inserted through the insertion hole 31f formed in the side plate portion 31a of the bowl-shaped body 31, and the connection terminal 22a is The opposite end surface is brought into contact with the inner surface of the side plate portion 31b. In this state, the fixing protrusion 33 d of the fixing band 33 is brought into contact with the outer surface of the side plate portion 31 a of the flange 31, and then the screw 33 e and the nut 33 f are tightened to fix the fixing band 33 to the capacitor 22. And the capacitor | condenser 22 is detachably fixed to the hook-shaped body 31 by screwing the fixing protrusion 33d of the fixing band 33 to the side plate portion 31a of the hook-shaped body 31.

In addition, a radiator 35 and an air cooling fan 36 are disposed at an end of the bowl-shaped body 31 facing the cooling water supply port 23a and the cooling water discharge port 23b of the heat sink 23 for the power module. Here, the air cooling fan 36 is disposed between the radiator 35 and the end face of the bowl-shaped body 31, and sucks outside air through the radiator 35 to supply cooling air to the cooling air passage 32.
As shown in FIG. 8, the radiator 35 is formed with cooling water supply ports 35a and cooling water discharge ports 35b at both ends on the upper side, and these cooling water supply ports 35a and cooling water discharge ports 35b are As shown in FIG. 6, it connects with the branch parts 24a and 25a of the cooling water supply pipe | tube 24 and the cooling water discharge pipe 25 which were mentioned above via the flexible pipes 37a and 37b.

Here, the pressure in the cooling water supply port 35a of the radiator 35 is balanced with the pressure in the cooling water supply port 23a of the heat sink 23 for the power module described above, and the flexible water is supplied to both at a predetermined ratio. The pipe diameter of 37a is adjusted.
And the radiator 35 and the air cooling fan 36 are being fixed in the common housing | casing 38, and the attachment flange part 38a formed in this housing | casing 38 is a flange part formed in the bowl-shaped body 31, as shown in FIG. It is bolted to 31g.

  The board storage unit 7 stores a control board 7a, a relay board 7b, and a power supply board 7c. And the power supply board 7c by the side of the power converter device 6 is hold | maintained so that it may oppose and maintain the predetermined space | interval to the cooling air discharge port side of the bowl-shaped body 31 of the power converter device 6. As shown in FIG. 2, the cooling air discharged from the bowl-shaped body 31 abuts against the power supply board 7 c and is shunted in the front-rear direction, one of which passes through the charging device 5 and returns to the radiator 35 side. Is formed, and a cooling air guide plate 39 for guiding the cooling air returning through the first circulation path is disposed on the opposite side of the charging device 5 at the inlet of the radiator 35.

Further, the other divided flow regulated by the power supply substrate 7 c is sucked by a blower fan 7 d provided on the front side of the substrate storage unit 7.
As shown in FIG. 2, the cooling air sucked by the blower fan 7d is guided by the cooling air guide plate 7e formed on the side opposite to the power supply substrate 7c, and charged through the substrates 7a to 7c. It is discharged to the device 5 side.
Further, the cooling air flowing upward from the cooling air discharge port 31h on the opposite side to the air cooling fan 36 of the bowl-shaped body 31 is disposed in the substrate storage portion 7 as shown in FIG. The cooling air guide plates 41 and 42 formed at different positions in the front-rear direction and the up-down direction flow along the support substrate 27 and the drive substrate 28 and are sucked by the radiator 35 on the opposite side, whereby the second cooling air is supplied. A circulation path is formed.

Next, the operation of the above embodiment will be described.
The control device 3 is mounted on the electric drive bus 1, and the cooling water supply pipe 24 and the cooling water discharge pipe 25 protruding from the control device housing 4 are connected to the cooling water supply source 26 provided in the electric drive bus 1. To do.
The cooling water supplied from the cooling water supply source 26 is supplied to the power module heat sink 23 and the radiator 35 of the condenser cooling unit 30 in the control device housing 4 through the cooling water supply pipe 24.

  In the power module heat sink 23, the cooling water supplied from the cooling water supply pipe 24 is supplied from the cooling water supply port 23a to the internal forward water passage 23d. In the forward water passage 23d, the cooling water supplied from the cooling water supply port 23a is temporarily stored in the cooling water reservoir 23f, and is evenly distributed from the cooling water reservoir 23f to a large number of water passages 23g. The cooling water that has passed through the water flow grooves 23g is stored again in the cooling water reservoirs 23h and 23k, and is evenly distributed from the cooling water reservoir 23k to a large number of water flow grooves 23j. And the cooling water which passed these water flow grooves 23j is returned to the cooling water supply source 26 through the cooling water reservoir 23i and the cooling water discharge port 23b and the cooling water discharge pipe 25.

In this way, the power module heat sink 23 is supplied with cooling water and is cooled with water, so that the six IGBT modules 21 serving as heat generating components mounted on the upper surface of the power module heat sink 23 are efficiently cooled. can do.
On the other hand, the cooling water supplied from the cooling water supply pipe 24 is supplied from the branch part 24a to the cooling water supply port 35a of the radiator 35 of the condenser cooling part 30 through the flexible pipe 37a. The cooling water supplied to the radiator 35 is discharged from the cooling water discharge port 35b to the branching portion 25a of the cooling water discharge pipe 25 through the flexible pipe 37b through a pipe provided with a large number of cooling fins inside the radiator 35. .

An air cooling fan 36 is disposed inside the radiator 35. The air cooling fan 36 sucks the cooling air cooled by the radiator 35, and is configured by the bowl 31 and the bottom surface of the power module heat sink 23. The cooling air passage 32 is blown.
In the cooling air passage 32, the six capacitors 22 supported by the bowl-shaped body 31 are aligned and held at a predetermined interval in the longitudinal direction, so that each capacitor 22 is efficiently cooled by the cooling air. The cooling air that has cooled the condenser 22 is discharged from the cooling air discharge port 31 h of the bowl-shaped body 31. The cooling air discharged from the cooling air discharge port 31h abuts on the power supply substrate 7c of the substrate storage portion 7 and is divided into three directions, upward and front and rear.

Of the diverted cooling air, the cooling air flowing backward cools the components of the charging circuit 11 mounted on the charging device 5 through the first cooling air circulation path and is arranged on the front side of the radiator 35. It is guided by the provided cooling air guide plate 39 and returns to the radiator 35.
In addition, the cooling air that flows toward the front side among the diverted cooling air is sucked by the blower fan 7d of the substrate housing portion 7 and guided by the cooling air guide plate 7e, while the control board 7a, the relay board 7b, and the power supply board 7c. After cooling each board | substrate 7a-7c through the space | interval, it returns to the charging device 5 side, and joins a 1st cooling air circulation path.

  As described above, according to the above-described embodiment, the cooling water is supplied from the outside into the control device casing 4 through the cooling water supply pipe 24 and the cooling water discharge pipe 25, and the supplied cooling water is mounted on the IGBT module 21. By supplying the power module heat sink 23 to the power module heat sink 23, the power module heat sink 23 can efficiently cool the IGBT module 21, which is a heat generating component, and the cooling efficiency can be improved.

Similarly, the condenser 22 that is a heat generating component is provided with a dedicated condenser cooling section 30 and cooled by the cooling air in the condenser cooling section 30, so that the condenser 22 can be efficiently cooled, and the cooling efficiency is improved. Can be improved.
In the power module heat sink 23, the cooling water pools 23f and 23k are formed on the inlet side of the water flow grooves 23g and 23j, so that the cooling water can be evenly distributed to the water flow grooves 23g and 23j. Therefore, it is possible to prevent the occurrence of uneven temperature of the heat sink.

  In the condenser cooling unit 30, the condenser 22 is inserted into the cooling air passage 32 of the bowl-shaped body 31 at a predetermined interval in the longitudinal direction, and is connected to the cooling water supply pipe 24 at one end side of the bowl-shaped body 31. Since the radiator 35 and the air cooling fan 36 are provided for cooling, the radiator 35 can always exhibit a constant cooling effect. And since the air cooling fan 36 is arrange | positioned at the back | latter stage side of the radiator 35, the cooling air cooled with the radiator 35 will be attracted | sucked by the air cooling fan 36, and the air cooling fan 36 may be exposed to high temperature air. In addition, the durability of the air cooling fan 36 can be improved.

Further, since the heat sink 23 for the power module has many water flow grooves 23g and 23j, the pipe resistance of the cooling water increases, and the branch of the cooling water to the radiator 35 of the condenser cooling unit 30 does not adjust the flow rate. This can be done easily by simply adjusting the pipe diameter of the flexible pipe 37a.
Furthermore, since the first cooling air circulation path for returning the cooling air after cooling the capacitor 22 by the capacitor cooling unit 30 to the radiator 35 through the charging device 5 is provided, a special cooling mechanism for the charging device 5 is not provided. The charging device 5 can be cooled.

Similarly, since the cooling air after cooling the capacitor 22 by the capacitor cooling unit 30 is made to flow to the charging device 5 side through the substrate storage unit 7, the temperature required by the blower fan 7 d in the substrate storage unit 7 as well. It can cool without providing the cooling mechanism for lowering.
Further, the cooling air after cooling the capacitor 22 by the capacitor cooling unit 30 passes through the IGBT module 21 arranged on the upper surface side of the power module heat sink 23 and the driving substrate 28 on which the gate driving device and the interface unit are mounted, and the radiator 35. Since the second cooling air circulation path returning to is provided, the IGBT module 21 and the drive substrate 28 can be cooled by the cooling air, and the cooling effect can be further improved.

Further, since the bowl-shaped body 31 of the capacitor cooling unit 30 is attached to the power module heat sink 23 to form the cooling air passage 32 surrounded by the bowl-shaped body 31 and the power module heat sink 23, the cooling air by the radiator 35 is cooled. In addition, the capacitor 22 can be cooled by both the cool air of the power module heat sink 23 and the cooling efficiency of the capacitor can be further improved.
Further, since the cooling water is supplied to the cooling water supply pipe 24 from the external cooling water supply source 26, the temperature of the cooling air circulating in the control device housing 4 is not affected by the outside air temperature, and the control device The temperature rise in the housing 4 can be suppressed, and an efficient cooling effect can always be exhibited.

  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 two IGBT modules 21 were used by 1 set for heavy load drive like the electric motor for driving | running | working of an electric drive bus | bath, it is not limited to this, When applied to a normal electric drive vehicle or a hybrid vehicle, it is sufficient to use one IGBT module 21 per phase, and three capacitors 22 may be provided.
In the above-described embodiment, the case where the bowl-shaped body 31 having the open upper end is used has been described. However, the present invention is not limited to this, and a rectangular cylinder with the upper end closed may be applied. The cross-sectional shape of the cylindrical body 31 and the cylindrical body is not limited to a square, and can be any shape.

Moreover, although the said embodiment demonstrated the case where the power converter device 6 was arrange | positioned in the control apparatus housing | casing 4, it is not limited to this, It is also possible to provide only the power converter device 6 in a dedicated housing | casing. It is also possible to omit the casing that covers the outside.
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.

  In the above embodiment, the case where the present invention is applied to an electric drive bus has been described. However, the present invention is not limited to this, and the present invention is applicable to an arbitrary electric drive vehicle such as an electric vehicle, a hybrid vehicle, and an electric drive railway vehicle. The invention can be applied, and the power conversion device is not limited to an electrically driven vehicle, and the power conversion device of the present invention can be applied when driving an actuator such as an electric motor in other industrial equipment.

  DESCRIPTION OF SYMBOLS 1 ... Electric drive bus, 2 ... Storage battery accommodating part, 3 ... Control apparatus, 4 ... Control apparatus housing | casing, 5 ... Charging apparatus, 6 ... Power converter device, 7 ... Board | substrate accommodating part, 21 ... Rod-shaped body, 23 ... Power Module heat sink, 23a ... cooling supply port, 23b ... cooling water discharge port, 23c ... partition plate, 23d ... outward water passage, 23e ... return water passage, 23f, 23h, 23i, 23k ... cooling water reservoir, 23g, 23j ... through Water groove, 24 ... cooling water supply pipe, 25 ... cooling water discharge pipe, 26 ... cooling water supply source, 30 ... condenser cooling section, 31 ... saddle-like body, 32 ... cooling air passage, 33 ... fixing band, 35 ... Radiator, 36 ... Air cooling fan

Claims (8)

A power module that has a switching element and converts DC power into polyphase AC power;
A plurality of capacitors for smoothing DC power;
A power conversion device comprising:
A heat sink for a power module equipped with the power module;
A power conversion device comprising: a capacitor cooling section that mounts the capacitor fixed to the power module heat sink and cools it with cold air.   The heat sink for the power module includes a cooling medium passage having a plurality of cooling medium passage grooves communicating between the cooling medium supply port and the cooling medium discharge port in a housing in which a cooling medium supply port and a cooling medium discharge port are formed. The power conversion device according to claim 1, wherein the power conversion device has a formed configuration.   The condenser cooling section includes a support cylinder section that supports the plurality of capacitors in a direction intersecting with the longitudinal direction at intervals in the longitudinal direction, and supports the cooling cylinder so as to form a cooling air passage. The power conversion device according to claim 1, further comprising: a radiator provided with a cooling medium disposed in an opening at one end thereof and a cooling mechanism including an air cooling fan.   The power conversion device according to claim 3, wherein the support cylinder portion is attached to a side opposite to a mounting surface of the power module of the heat sink for the power module.   The power converter according to claim 3, wherein the air cooling fan is interposed between the radiator and the opening of the cylindrical body.   In the radiator, a cooling medium supply port and a cooling medium discharge port are provided in a cooling medium supply pipe for supplying cooling water to the power module heat sink and a cooling medium discharge pipe for discharging the cooling medium from the power module heat sink. The power conversion device according to claim 3, wherein the power conversion device is connected to the unit.   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 6.   The power conversion device is arranged in parallel with a charging device having a charging circuit mounted in a control device housing, and cooling air exhausted from the capacitor cooling unit cools the charging device and then returns to the capacitor cooling unit. The electrically driven vehicle according to claim 7, wherein a medium circulation passage is formed.

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