CN202309552U - Power conversion device and power driving car with power conversion device - Google Patents

Abstract

The utility model provides a power conversion device which can fully perform the cooling of capacitors and power modules and a power driving car using the power conversion device. The power conversion device (6) comprises a power module (21) which has a switch member and converts direct current power to polyphase alternating current power, a plurality of capacitors (22) which smooth direct current power, a power module heat dissipation part (23) provided with the power module (21), and a capacitor cooling part (30) which is fixed on the power module heat dissipation part (23), is provided with the capacitors (22) and employs cooling air to cool the capacitors.

Description

Power conversion device and electric drive vehicle using the power conversion device

technical field

The utility model relates to a power conversion device and an electric drive vehicle using the power conversion device, wherein the power conversion device includes a switching element, a power module for converting DC power into multi-phase AC power, and a plurality of smoothing devices for smoothing DC power. Use capacitors.

Background technique

In electrically driven vehicles such as electric vehicles and hybrid vehicles, a power conversion device including, for example, an inverter is used that converts DC power into multiphase AC power to drive an actuator such as a motor.

In this kind of power conversion device, since it is necessary to convert hundreds of volts of DC power into multi-phase AC power, it is unavoidable to avoid heat generation of the power module and the smoothing capacitor constituting the power conversion device. At least the power module and the smoothing capacitor need to be cool down.

As a conventional power conversion device, it is proposed to include an IPM (Intelligent Power Module, Intelligent Power Module), a power module, a DC/DC converter (converter), a reactor, a control board, and a capacitor, and a cooling system for these components. A power conversion device for a cooling mechanism (for example, refer to Patent Document 1).

The cooling mechanism of this power conversion device is configured such that a first cooling device and a second cooling device are arranged vertically at a predetermined interval, and the first cooling device and the second cooling device are connected between the first cooling device and the second cooling device. Also, cooling water is circulated through the first cooling device, the first cooler, the second cooling device, and the second cooler. In this cooling mechanism, by arranging the IPM, the control board, and the capacitor between the first cooler and the second cooler, and arranging the DC/DC converter and the reactor above the first cooler, each configuration parts to cool.

Patent Document 1: Japanese Patent Laid-Open No. 2009-27901

Here, in the conventional example described in the above-mentioned Patent Document 1, the first cooling device and the second cooling device arranged vertically are connected by the first cooler and the second cooler, and the cooling device cooled by the first cooler is Cooling water is sent to the first cooling device, thereby cooling the reactor, DC/DC converter and IPM. Then, the heat-exchanged cooling water is cooled by the second cooler, and then supplied to the second cooler to cool the capacitor.

However, in the above-mentioned conventional example, the outside air supplied to the first cooler passes through the second cooler and is supplied to the first cooler while being heated by the heat generated by the IPM or the capacitor, so the first cooler The cooling capacity of the capacitor will inevitably decrease, and the temperature of the external air passing over the capacitor will not be lowered to the extent of air cooling, so there is an unsolved problem that the capacitor that becomes a heat generating body cannot be sufficiently cooled.

Contents of the invention

Therefore, the present invention has been made focusing on the unsolved problems in the above-mentioned conventional examples, and its object is to provide a power conversion device capable of sufficiently cooling capacitors and power modules, and a device using the power conversion device. Electric drive car.

In order to achieve the above object, a power conversion device according to the present invention includes: a power module having switching elements for converting DC power into multi-phase AC power; a plurality of capacitors for smoothing DC power; A power module heat sink of the power module; and a capacitor cooling unit fixed to the power module heat sink to mount the capacitor and cool the capacitor with cold air.

According to this structure, the power module is cooled by the cooling medium through the power module cooling unit, and the capacitor is cooled by cold air through the capacitor cooling unit. Therefore, the capacitor can be cooled in the dedicated cooling unit, and the cooling capacity of the capacitor can be improved.

In addition, the power conversion device according to another aspect of the present invention is characterized in that the heat dissipation unit for the power module has a structure in which a cooling medium passage is formed in a case in which a cooling medium supply port and a cooling medium discharge port are formed, and the cooling medium The medium passage has a plurality of cooling medium passage grooves communicating between the cooling medium supply port and the cooling medium discharge port.

According to this structure, the cooling medium supplied from the cooling medium supply port passes through the cooling medium passage having a plurality of cooling medium passing grooves, and is discharged from the cooling medium discharge port, so the surface area in contact with the cooling medium can be enlarged, and the cooling of the heat dissipation part can be improved. efficiency. At this time, by providing the coolant supply port and the coolant discharge port together at one end of the power module heat sink, it is possible to form coolant passages in the outgoing path and the return path. Therefore, the cross-sectional area of the cooling medium passage can be reduced, and the flow of the cooling medium passing through the cooling medium passing groove can be made uniform.

In addition, according to another aspect of the present invention, the power conversion device is characterized in that the cooling unit for capacitors includes: a support cylinder that supports the plurality of capacitors in a direction intersecting with the longitudinal direction such that the plurality of capacitors are The directions are arranged at intervals to form a cooling air passage; and a cooling mechanism including a cooler and an air-cooling fan provided with a cooling medium through an opening arranged at one end of the support cylinder.

According to this structure, since the cooling means supplies the cooling air cooled by the cooler to the plurality of capacitors by the air cooling fan to cool the capacitors, the cooling efficiency of the capacitors can be improved.

In addition, according to another aspect of the present invention, the power conversion device is characterized in that the support cylinder is mounted on a side of the power module heat sink that is opposite to the mounting surface of the power module.

According to this configuration, since the support cylinder portion supporting the capacitor is attached to the power module heat sink, the cooling effect of the power module heat sink can be enjoyed, and the cooling capacity of the capacitor can be further improved.

Moreover, the power conversion device of another aspect of this invention is characterized in that the said air-cooling fan is located between the said cooler and the opening part of the said cylinder.

According to this configuration, since the air cooling fan is located on the rear side of the cooler, the air cooling fan is not directly exposed to the outside air by blowing the cold air cooled by the cooler with the air cooling fan, and the durability of the air cooling fan can be improved.

In addition, a power conversion device according to another aspect of the present invention is characterized in that the cooling medium supply port and the cooling medium discharge port of the cooler are connected to the cooling medium supply pipe and the Branches on the cooling medium discharge pipe for discharging the cooling medium from the power module heat sink are connected.

According to this configuration, the cooling water of the power module heat sink and the cooling medium supplied to the cooler can be supplied and discharged through the common cooling medium supply pipe and cooling medium discharge pipe, and the cooling medium can be supplied and discharged from one cooling medium supply source.

In addition, an electric drive vehicle according to another aspect of the present invention is characterized in that the driving electric motor is controlled using the above-mentioned power conversion device.

According to this configuration, since the electric power conversion device having the above-mentioned effects is used to control the running motor of the electrically driven vehicle, heat generated by the power conversion device can be suppressed and stable running can be ensured.

In addition, the electric drive vehicle according to another aspect of the present invention is characterized in that the above-mentioned power conversion device is arranged in parallel with the charging device on which the charging circuit is installed in the control device box, and is formed with a cooling device that discharges from the above-mentioned capacitor cooling unit. The wind returns to the cooling medium circulation path of the capacitor cooling unit after cooling the charging device.

According to this configuration, the power conversion device can cool another charging device, and the cooling mechanism can be simplified.

Utility Model Effect

According to the present invention, the power module is cooled by the heat sink for the power module, and the capacitor is cooled by cold air by the cooling unit for the capacitor. Therefore, the power module and the capacitor can be cooled separately, and insufficient cooling of the capacitor can be reliably prevented. Here, by making the cooling unit for the capacitor consist of a support cylinder supporting the capacitor, a cooler having an opening provided at one end of the support cylinder, and a cooling mechanism of an air-cooling fan, the capacitor can be cooled by cold air cooled by cooling water. Air cooling can improve the cooling capacity of the capacitor.

In addition, by controlling the electric motor for movement using the power conversion device having the above-mentioned effects, it is possible to provide an electrically driven vehicle with high durability of the control device.

Description of drawings

FIG. 1 is a schematic configuration diagram showing an embodiment of an electric drive vehicle to which the present invention can be applied.

Fig. 2 is a schematic cross-sectional view showing a control device.

Fig. 3 is a schematic longitudinal sectional view showing a control device.

Fig. 4 is a perspective view viewed from obliquely above the power conversion device.

Fig. 5 is a perspective view viewed from obliquely below the power conversion device.

6 is an enlarged perspective view showing a water supply unit/drainage unit of the power conversion device.

7 is a diagram showing a heat dissipation unit for a power module, (a) is an external perspective view, and (b) is a perspective view in cross section.

It is a figure which shows a cooler, (a) is a front view, (b) is a side view.

Fig. 9 is a schematic configuration diagram showing a cooling unit for capacitors, in which (a) is a cross-sectional view and (b) is a side view.

Explanation of reference signs

1...electric drive vehicle; 2...battery storage part; 3...control device; 4...control device box; 5...charging device; 6...power conversion device; 7...substrate storage part; Module cooling part; 23a...cooling supply port; 23b...cooling water discharge port; 23c...dividing plate; 23d...outgoing waterway; , 23j...water channel; 24...cooling water supply pipe; 25...cooling water discharge pipe; 26...cooling water supply source; 30...capacitor cooling unit; ;35...cooler; 36...air cooling fan

Detailed ways

Below, embodiment of the present utility model is described with reference to accompanying drawing.

FIG. 1 is a diagram showing a schematic configuration when the present invention is applied to an electrically driven bus as an electrically driven vehicle.

In the figure, 1 is an electric-driven bus, and this electric-driven bus 1 is provided with, for example, a battery storage section 2 for storing a plurality of storage batteries on the rear side of the vehicle, and a control device is arranged on, for example, an upper side of the battery storage section 2. 3.

As shown in FIGS. 2 and 3 , the control device 3 includes a cuboid-shaped control device case 4 having liquid-tightness. In the control device case 4 , a charging device 5 and a power conversion device 6 are disposed front and rear, and a substrate storage portion 7 is disposed on the right side of the charging device 5 and power conversion device 6 .

The charging device 5 includes a charging circuit 11 for charging the battery stored in the battery storage unit 2 . The charging circuit 11 is provided with a charging resistor 12 for preventing 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 for converting DC power into three-phase AC power, and an IGBT module connected to the input side of the IGBT modules 21 to smooth the DC power. 6 cylindrical capacitors 22 that have been optimized. The IGBT module 21 incorporates an IGBT (Insulated Gate Bipolar Transistor) which is a switching element connected in series, a protection circuit, and the like.

In addition, six IGBT modules 21 are placed on the upper surface of the flat rectangular parallelepiped-shaped power module heat dissipation part 23. Two groups are used as a group, and three groups corresponding to U-phase, V-phase and W-phase of the three-phase AC power are arranged on the upper surface. Install with a predetermined interval in the axial direction.

Furthermore, as shown in FIG. 3 , a support substrate 27 is disposed on the upper surface of the IGBT module 21, and above the support substrate 27, a drive substrate 28 is supported by a pillar 29 at a predetermined interval, and the drive substrate 28 is mounted with the drive IGBT module. The gate drive circuit (GDU: Gate Drive Unit) and the interface (I/F) circuit of the gate of the IGBT in 21 .

In addition, the six capacitors 22 are supported by the capacitor cooling unit 30 fixed to the lower surface of the power module heat dissipation unit 23 .

The power module heat sink 23 is formed of aluminum, an aluminum alloy, or the like with high thermal conductivity. As shown in FIGS. 7( a ) and ( b ), this heat dissipation unit 23 for a power module is provided with a cooling water supply port 23 a for supplying cooling water as a cooling medium and a cooling water outlet 23 a for discharging cooling water on one end side in the longitudinal direction. In the discharge port 23b, an outgoing water passage 23d and a return water passage 23e which are partitioned in a direction perpendicular to the longitudinal direction by a partition plate 23c are formed as cooling medium passages. In the outlet water passage 23d, a cooling water reservoir 23f is formed inside the cooling water supply port 23a, and a plurality of cooling mediums extending in the longitudinal direction are formed at a predetermined interval on the other end side in communication with the cooling water reservoir 23f. The cooling water reservoir 23h is formed on the rear end side of the water passage grooves 23g through the water passage grooves 23g. The circuit water passage 23e also has the same structure as the outlet water passage 23d, and a cooling water reservoir 23i is formed inside the cooling water discharge port 23b, and a plurality of cooling medium passing grooves communicating with the cooling water reservoir 23i are formed. In the water passage groove 23j, a cooling water reservoir 23k communicating with the cooling water reservoir 23h is formed on the rear end side of the water passage groove 23j.

In this way, since the plurality of water passage grooves 23j are formed to extend in the longitudinal direction in the outward passage water passage 23d and the return passage water passage 23e, the surface area in contact with cooling water increases, thereby improving cooling efficiency. In addition, both the outgoing water passage 23d and the return water passage 23e have cooling water reservoirs 23f and 23k formed on the cooling water inlet side of the plurality of water passage grooves 23g and 23j. Therefore, the pipeline resistance of the water flow grooves 23g and 23j is large, so the cooling water accumulates in the cooling water reservoir 23f before entering the water flow grooves 23g and 23j, and then enters the water flow grooves 23g and 23j, so that the cooling water can be evenly flowed into many parts. There are two water channels 23g and 23j.

Further, the cooling water supply pipe 24 is connected to the cooling water supply port 23a of the power module heat sink 23, and the cooling water discharge pipe 25 is connected to the cooling water discharge port 23b. The other ends of the cooling water supply pipe 24 and the cooling water discharge pipe 25 protrude from the control device case 4 and are connected to a cooling water supply source 26 disposed on the vehicle body side.

In addition, the capacitor cooling unit 30 has a channel-shaped body 31 as a support cylinder, and the channel-shaped body 31 includes a pair of side plate portions 31a, 31b arranged at a predetermined distance from each other and a bottom surface connecting the pair of side plate portions 31a, 31b. The bottom plate portion 31 c has an open upper end and extends along the longitudinal direction of the power module heat dissipation portion 23 . Flange parts 31d and 31e extending outward from the open upper ends of the side plate parts 31a and 31b are formed in the channel body 31 . The flange portions 31d and 31e are fixed 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, with screws. Thus, as shown in FIG. 9( a ), a cooling air duct 32 having a substantially square cross section surrounded by the left and right side plate portions 31 a, 31 b, the bottom plate portion 31 c, and the bottom surface of the power module heat dissipation portion 23 of the trough-shaped body 31 is formed. .

Further, in one side plate portion 31a of the trough body 31, insertion holes 31f through which the capacitors 22 are inserted are formed at predetermined intervals in the longitudinal direction. On the other hand, in each capacitor 22, a fixing belt 33 is attached to the connection terminal 22a side. This fixing belt 33 is shown in Fig. 4, Fig. 5 and Fig. 9 (a), comprises: the belt portion 33a that will open in the axial direction along a part on the circumference of the outer peripheral surface of capacitor 22; A pair of flange portions 33b, 33c formed in the open portion of the belt portion 33a; a predetermined number, for example, three, fixed protrusions 33d are formed on the side of the groove body 31 of the belt portion 33a; and screws 33e and Nut 33f.

In addition, the capacitor 22 is fixed to the tank-shaped body 31 as follows.

That is, in a state where the fixing belt 33 is attached to the outer peripheral surface of the capacitor 22 on the side of the connecting terminal 22a, the capacitor 22 is inserted into the insertion hole 31f formed in the side plate portion 31a of the tank-shaped body 31, and the The opposite end surface of the connection terminal 22a is in contact with the inner surface of the side plate portion 31b. In this state, the fixing protruding portion 33d of the fixing belt 33 comes into contact with the outer surface of the side plate portion 31a of the trough 31 , and then the screws 33e and nuts 33f are tightened to fix the fixing belt 33 to the capacitor 22 . Next, the capacitor 22 is detachably fixed to the tank body 31 by screwing the fixing protruding portion 33d of the fixing belt 33 and the side plate portion 31a of the tank body 31 .

In addition, a cooler 35 and an air cooling fan 36 are arranged at an end of the tank body 31 facing the cooling water supply port 23 a and the cooling water discharge port 23 b of the power module heat sink 23 . Here, the air-cooling fan 36 is disposed between the cooler 35 and the end surface of the trough 31 , and sucks outside air through the cooler 35 , thereby supplying cooling air to the cooling air duct 32 . In addition, as shown in FIG. 8, in the cooler 35, a cooling water supply port 35a and a cooling water discharge port 35b are formed at both ends of the upper side. As shown in FIG. 6, the cooling water supply port 35a and the cooling water discharge port 35b is connected to branch portions 24a and 25a of the above-mentioned cooling water supply pipe 24 and cooling water discharge pipe 25 via hoses 37a and 37b.

Here, the pressure at the cooling water supply port 35a of the cooler 35 and the pressure at the cooling water supply port 23a of the above-mentioned power module heat sink 23 are balanced so that the cooling water is supplied to both at a predetermined ratio. Adjust the piping diameter of the hose 37a. In addition, the cooler 35 and the air-cooling fan 36 are fixed in a common box body 38. As shown in FIG. Bolt tight.

In addition, the board storage section 7 houses a control board 7 a, a relay board 7 b, and a power board 7 c. In addition, the power supply board 7 c on the side of the power conversion device 6 is held so as to face the side of the cooling air discharge port of the tank-shaped body 31 of the power conversion device 6 with a predetermined distance therebetween. As shown in Figure 2, the cooling air discharged from the trough 31 abuts against the power supply board 7c and splits to the front and back direction, one side passes through the charging device 5 and then returns to the side of the cooler 35 to form a first circulation path. On the side opposite to the charging device 5 of the inlet of the charging device 5, a cooling air guide plate 39 for guiding the cooling air returning along the first circulation path is arranged.

In addition, the other side of the cooling air dominated and divided by the power supply board 7 c is sucked by the blower fan 7 d provided on the front side of the board storage portion 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 board 7c, and passes between the boards 7a-7c to the charging device 5 side. discharge.

In addition, as shown in FIG. 3 , among the cooling air discharged from the cooling air outlet 31 h on the side opposite to the air cooling fan 36 of the trough body 31 , the upward cooling air passes through the front-rear direction and the The cooling air guide plates 41 and 42 formed at different positions in the vertical direction flow along the support base plate 27 and the driving base plate 28 and are sucked by the cooler 35 on the opposite side, thereby forming a second cooling air circulation path.

Next, the operation of the above-mentioned embodiment will be described.

The control device 3 is mounted on the electrically driven bus 1, and the cooling water supply pipe 24 and the cooling water discharge pipe 25 protruding from the control device case 4 are connected to the cooling water supply source 26 provided on the electrically driven bus 1. . The cooling water supplied from the cooling water supply source 26 is supplied to the power module radiator 23 and the cooler 35 of the capacitor cooling unit 30 in the control device case 4 through the cooling water supply pipe 24 .

In the heat dissipation unit 23 for a power module, the cooling water supplied from the cooling water supply pipe 24 is supplied from the cooling water supply port 23 a to the internal outlet water passage 23 d. In the outlet water passage 23d, the cooling water supplied from the cooling water supply port 23a is temporarily stored in the cooling water storage part 23f, and is equally distributed to the plurality of water flow tanks 23g from the cooling water storage part 23f. The cooling water passing through these water flow grooves 23g is stored again in the cooling water storage parts 23h and 23k, and is evenly distributed to the plurality of water flow grooves 23j from the cooling water storage part 23k. Then, the cooling water that has passed through these water passage grooves 23 j passes through the cooling water reservoir 23 , and returns to the cooling water supply source 26 through the cooling water discharge port 23 b and the cooling water discharge pipe 25 .

In this way, the cooling water is supplied to the power module heat dissipation unit 23 for water cooling, and the six IGBT modules 21 serving as heat generating components mounted on the upper surface of the power module heat dissipation unit 23 can be efficiently cooled.

On the other hand, the cooling water supplied from the cooling water supply pipe 24 is supplied from the branch portion 24 a to the cooling water supply port 35 a of the cooler 35 of the capacitor cooling unit 30 through the hose 37 a. The cooling water supplied to the cooler 35 surrounds the piping provided with a plurality of cooling fins inside the cooler 35 , and is discharged from the cooling water discharge port 35 b to the branch portion 25 a of the cooling water discharge pipe 25 through the hose 37 b.

Furthermore, an air-cooling fan 36 is arranged inside the cooler 35, and the cooling air cooled in the cooler 35 is sucked in by the air-cooling fan 36, and is cooled by the bottom surface of the trough-shaped body 31 and the power module radiating part 23. The wind channel 32 performs blowing.

In the cooling air passage 32, six capacitors 22 supported by the trough-shaped body 31 are arranged and held at predetermined intervals in the longitudinal direction, so that the respective capacitors 22 are efficiently cooled by the cooling air. The cooling air that has cooled the capacitor 22 is discharged from the cooling air discharge port 31h of the tank-shaped body 31 . The cooling air discharged from the cooling air outlet 31h comes into contact with the power supply board 7c of the board storage portion 7, and is divided into three directions: upward and front and rear.

Among the divided cooling air, the rearward cooling air cools the components of the charging circuit 11 mounted on the charging device 5 through the first cooling air circulation path, and is guided by the cooling air arranged on the front side of the cooler 35. The plate 39 leads back to the cooler 35 .

In addition, among the divided cooling air, the cooling air directed toward the front side is sucked by the blower fan 7d of the board storage part 7, guided by the cooling air guide plate 7e, and flows from between the control board 7a, the relay board 7b, and the power board 7c. The substrates 7a to 7c are cooled by passing between them, and then returned to the charging device 5 side to merge with the first cooling air circulation path.

Thus, according to the above-mentioned embodiment, the cooling water is supplied from the outside into the control device case 4 through the cooling water supply pipe 24 and the cooling water discharge pipe 25, and the supplied cooling water is sent to the power module heat dissipation part on which the IGBT module 21 is mounted. 23 , the IGBT module 21 , which is a heat generating component, can be efficiently cooled by the power module heat dissipation unit 23 , and the cooling efficiency can be improved.

Also, for the capacitor 22 which is a heat-generating component, a dedicated capacitor cooling unit 30 is provided, and the capacitor cooling unit 30 is cooled by cooling air, so the capacitor 22 can be efficiently cooled and cooling efficiency can be improved.

Furthermore, in the power module heat dissipation unit 23, since the cooling water reservoirs 23f and 23k are formed on the inlet sides of the water passage grooves 23g and 23j, the cooling water can be evenly distributed to the water passage grooves 23g and 23j, and the generation of heat dissipation parts can be prevented. Uneven temperature.

In addition, in the capacitor cooling unit 30, since the capacitors 22 are inserted into the cooling air passage 32 of the trough body 31 at a predetermined interval in the longitudinal direction, a cooling water supply pipe 24 connected to the cooling water supply pipe 24 is provided at one end side of the trough body 31. Cooling is performed by the connected cooler 35 and the air-cooling fan 36, so the cooler 35 can always exert a certain cooling effect. And since the air cooling fan 36 is arranged on the rear stage side of the cooler 35, the cooling air cooled by the cooler 35 is sucked with the air cooling fan 36, and the air cooling fan 36 will not be exposed to high temperature air, so that the air cooling fan 36 can be increased durability.

In addition, since the heat dissipation part 23 for the power module has a plurality of water passage grooves 23g and 23j, the pipeline resistance of the cooling water becomes large, and the branch of the cooling water to the cooler 35 of the capacitor cooling part 30 does not perform flow adjustment, but only adjusts the flow rate. The piping diameter of the hose 37a can be easily adjusted.

Furthermore, since the cooling air after cooling the capacitor 22 in the capacitor cooling unit 30 is provided, the first cooling air circulation path returns to the cooler 35 through the charging device 5, so that the charging device 5 can be cooled without providing a special cooling mechanism. The charging device 5 is cooled.

Similarly, since the cooling air after cooling the capacitor 22 in the capacitor cooling unit 30 is designed to flow to the charging device 5 side through the substrate storage unit 7, the substrate storage unit 7 requires the blower fan 7d, but it is not required. Cooling can be performed by providing a cooling mechanism for lowering the temperature.

In addition, since the cooling air after the capacitor 22 is cooled by the capacitor cooling unit 30 is provided, it passes through the IGBT module 21 arranged on the upper surface side of the power module heat dissipation unit 23 and the drive substrate 28 on which the gate driver and the interface unit are mounted. Since it returns to the second cooling air circulation path of the cooler 35, the IGBT module 21 and the drive substrate 28 can be cooled by the cooling air, and their cooling effect can be further improved.

In addition, since the tank-shaped body 31 of the capacitor cooling unit 30 is attached to the heat dissipation unit 23 for the power module, the cooling air passage 32 surrounded by the tank-shaped body 31 and the heat dissipation unit 23 for the power module is formed. Both the incoming cooling air and the cold air from the power module heat dissipation unit 23 cool the capacitor 22 , and the cooling efficiency of the capacitor can be further improved.

In addition, since the cooling water is supplied from the external cooling water supply source 26 to the cooling water supply pipe 24, the temperature of the cooling air circulating in the control device case 4 is not affected by the temperature of the outside air, and the temperature of the control device case can be suppressed. 4. The temperature rises inside, and the efficient cooling effect can always be exerted.

It should be noted that, in the above-mentioned embodiment, the case of using cooling water as the cooling medium has been described, but it is not limited to this, and chlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) can also be applied. Other cooling media such as freon substitutes, other cooling gases, and cooling liquids. In this case, when using a CFC substitute, the CFC substitute used for an air conditioner can also be branched and used.

In addition, in the above-mentioned embodiment, the case where two IGBT modules 21 are used in sets of two for driving heavy loads like the running motor of an electrically driven bus has been described, but it is not limited thereto. In the case of electric vehicle or hybrid vehicle application, only one IGBT module 21 is used for one phase, and only three capacitors 22 are required.

In addition, in the above-mentioned embodiment, the case of using the trough-shaped body 31 with the upper end open has been described, but it is not limited to this, and the square cylinder with the upper end closed can also be applied. In addition, the trough-shaped body 31 and the cylindrical body The cross-sectional shape is not limited to a square, and can be designed into any shape.

In addition, in the above-mentioned embodiment, the case where the power conversion device 6 is disposed in the control device case 4 has been described, but the present invention is not limited to this, and only the power conversion device 6 can be installed in a dedicated case. , the box covering the outside can also be omitted.

In addition, in the above-mentioned embodiment, the case where an IGBT module incorporating an IGBT is used as a power module has been described, but the present invention is not limited to this, and a power module including a MOSFET or other power semiconductor elements can also be applied.

In addition, in the above-mentioned embodiment, the case where the present invention is applied to an electric drive bus has been described, but the present invention is not limited to this, and the present invention can be applied to any vehicle such as an electric car, a hybrid car, or an electric drive rail vehicle. In an electric drive vehicle, the power conversion device of the present invention can also be applied when the power conversion device is not limited to an electric drive vehicle and drives an actuator such as a motor in other industrial equipment.

Claims (8)

1. a power inverter is characterized in that, comprising:

Have switch element, direct current power is converted into the power model of polyphase ac electric power;

Make a plurality of capacitors of direct current power smoothing;

The power model that said power model is installed is used radiating part; With

Be fixed on this power model and use radiating part, said capacitor is installed and uses cooling end with the capacitor that cold wind cools off said capacitor.

2. power inverter as claimed in claim 1 is characterized in that:

Said power model has following structure with radiating part: in the casing that is formed with coolant supply port and coolant outlet, be formed with the coolant path, this coolant path has a plurality of coolants that between said coolant supply port and said coolant outlet, are communicated with and passes through groove.

3. according to claim 1 or claim 2 power inverter is characterized in that:

Said capacitor comprises with cooling end:

Carrying cylinder portion, it supports said a plurality of capacitor in the direction of intersecting with length direction, makes said a plurality of capacitor arrange in this length direction devices spaced apart, and forms the cooling air passage; With

Comprise the peristome of an end that is configured in this carrying cylinder portion, and be supplied to the cooler of coolant and the cooling body of air cooling fan.

4. power inverter as claimed in claim 3 is characterized in that:

Said carrying cylinder portion is installed in said power model with a side opposite with installed surface said power model radiating part.

5. power inverter as claimed in claim 3 is characterized in that:

Said air cooling fan is between the peristome of said cooler and said cylindrical shell.

6. power inverter as claimed in claim 3 is characterized in that:

The coolant supply port of said cooler and coolant outlet are supplied with the coolant supply pipe of cooling water with radiating part and the branching portion of discharging with radiating part from said power model on the coolant discharge pipe of coolant links to said power model with being arranged on.

7. driven by power car is characterized in that:

Use each described power inverter in the claim 1～6, control with motor going.

8. driven by power car as claimed in claim 7 is characterized in that:

Said power inverter; In the control device casing, dispose abreast, be formed with the coolant peripheral passage that makes the cooling air of discharging from said capacitor cooling end after having cooled off said charging device, turn back to said capacitor cooling end with the charging device that charging circuit is installed.

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