JP2013062940A - On-vehicle electric power conversion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an on-board electric power conversion apparatus which inhibits interference between heat of a heating component of an inverter and heat of a heating component of a DC/DC converter.SOLUTION: In an on-board electric power conversion apparatus according to this invention, an inverter 2 has: a heating component for the inverter; and a cooler for the inverter 13 on which the heating component for the inverter is placed and which cools the heating component for the inverter, and a DC/DC converter 1 has: a heating component for the converter; and a cooler for the DC/DC converter 4 on which the heating component for the converter is placed and which cools the heating component for the converter. The heating component for the inverter and the heating component for the converter are respectively disposed at the sides opposite to each other sandwiching the cooler for the DC/DC converter 4.

Description

  In the present invention, an inverter that converts DC power supplied from a driving battery into AC power to drive a driving motor and a DCDC converter that converts DC power of the driving battery into DC power of different voltages are integrated. The present invention relates to an in-vehicle power converter.

  Conventionally installed in hybrid vehicles, plug-in hybrid vehicles, electric vehicles, etc., converting DC power supplied from a drive battery represented by a lithium-ion battery into AC power, and from an inverter that drives a drive motor and a drive battery Many mounting structures such as switching elements and transformers, cooling methods, and the like have been proposed in an in-vehicle power conversion apparatus in which a DCDC converter that converts supplied DC power into DC power of different voltages is integrated.

  For example, in Patent Document 1, in an electric power conversion apparatus in which an inverter and a DCDC converter are integrated, electronic components attached to the inverter such as a capacitor and a discharge resistor are disposed between the inverter cooler and the DCDC converter cooler. A structure for efficiently cooling these attached electronic components is described.

JP 2009-148027 A

However, the power converter described in Patent Document 1 has the following problems.
(1) The electronic components attached to the inverter, such as capacitors and discharge resistors, are brought into contact with the DCDC converter cooler to efficiently cool the attached electronic components. There is a concern that the heat-generating parts may interfere with heat and the temperature of the heat-generating parts of the DCDC converter or the electronic components attached to the inverter will rise more than expected.
(2) Since the inverter, the DCDC converter, and the case for storing each cooler are required separately from the cooler for the inverter and the cooler for the DCDC converter, many members such as aluminum die-casting are required. The volume of the entire power conversion device becomes large.

SUMMARY OF THE INVENTION An object of the present invention is to provide an in-vehicle power converter that suppresses interference between heat generated by a heat generating component of an inverter and heat generated by a DCDC converter. And
Further, there is no need to newly provide a cover for covering the heat generating component for the converter and the heat generating component for the inverter, and the number of components and the material cost can be reduced, and an in-vehicle power conversion device that can be downsized is obtained. For the purpose.

In the in-vehicle power conversion device according to the present invention, an in-vehicle power conversion in which an inverter that is mounted on a vehicle and converts DC power into AC power and a DCDC converter that converts DC power into DC power having a different voltage are integrated. In the device
The inverter includes an inverter heat generating component, and an inverter cooler on which the inverter heat generating component is mounted and cools the inverter heat generating component,
The DCDC converter includes a heat generating component for the converter and a DCDC converter cooler for mounting the heat generating component for the converter and cooling the heat generating component for the converter.
The inverter heat generating component and the converter heat generating component are disposed on opposite sides of the DCDC converter cooler.

Moreover, in the vehicle-mounted power converter according to the present invention, the inverter mounted on the vehicle and converting DC power into AC power and the DCDC converter that converts DC power into DC power having different voltages are integrated. In the power converter,
The inverter includes an inverter heat generating component, and an inverter cooler on which the inverter heat generating component is mounted and cools the inverter heat generating component,
The DCDC converter includes a converter heat generating component, and a DCDC converter cooler that mounts the converter heat generating component facing the inverter heat generating component and cools the converter heat generating component.
The DCDC converter cooler or the inverter cooler has a surrounding portion provided around the converter heat generating component or the inverter heat generating component,
The enclosure surrounds the converter heat generating component and the inverter heat generating component when the inverter and the DCDC converter are integrated.

  According to the in-vehicle power converter according to the present invention, the heat generating component for the inverter and the heat generating component for the converter are arranged on the opposite sides with the DCDC converter cooler interposed therebetween. It is possible to suppress the heat interference of the heat generating components of the converter, and it is possible to prevent the temperature of the heat generating components of the DCDC converter and the inverter from rising more than expected.

  Further, according to the in-vehicle power converter according to the present invention, the DCDC converter cooler or the inverter cooler has a surrounding portion provided so as to surround the converter heat generating component or the inverter heat generating component. Since the enclosure surrounds the converter heat generating component and the inverter heat generating component when the inverter and the DCDC converter are integrated, a cover for newly covering the converter heat generating component and the inverter heat generating component is provided. There is no necessity, and the number of parts and the material cost can be reduced, and the size can be reduced.

It is a disassembled perspective view which shows the vehicle-mounted power converter device of Embodiment 1 of this invention. It is an electric circuit diagram which shows the main circuit structure of the DCDC converter of FIG. It is an electric circuit diagram which shows the main circuit structure of the inverter of FIG. It is a perspective view which shows the heat conductive member which propagates the heat | fever of the heat-emitting component of the DCDC converter of FIG. 1 to a cover. It is a disassembled perspective view which shows the vehicle-mounted power converter device of Embodiment 2 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding members and parts will be described with the same reference numerals.
Embodiment 1 FIG.
1 is an exploded perspective view showing an in-vehicle power converter according to Embodiment 1 of the present invention, FIG. 2 is an electric circuit diagram showing a main circuit configuration of DCDC converter 1 in FIG. 1, and FIG. 3 is an inverter 2 in FIG. It is an electric circuit diagram which shows a main circuit structure.
In addition, in the electric circuit diagram of the DCDC converter 1 of FIG. 2, although the input side capacitor | condenser 11 and the output side capacitor | condenser 12 exist, they are abbreviate | omitted in FIG.
Further, in the electric circuit diagram of the inverter 2 in FIG. 3, a resistor 18 exists on the input side, but this is also omitted in FIG.
This in-vehicle power converter converts DC power supplied from a drive battery (not shown) into DC power of a different voltage and supplies it to a 14V auxiliary machine, and DC supplied from the drive battery. The inverter 2 which converts electric power into alternating current power and drives a drive motor, and the bottomed square-pillar-shaped cover 3 which covers the heat-emitting component of the DCDC converter 1 are provided.

The DCDC converter 1 is a chassis, a converter cooler 4 in which a cooling medium flows, and a plurality of switching elements 7, a resonance coil 8, a transformer 9, and a smoothing coil disposed on the upper surface of the cooler 4. 10. An inflow nipple 5 that is a cooling water channel into which the cooling medium flows is provided on one side surface of the cooler 4, and an outflow nipple 6 that is a cooling water channel from which the cooling medium flows out is provided on the other side surface. Yes. The cooling medium flowing in from the inflow nipple 5 meanders in the cooler 4 and flows out from the outflow nipple 6, and the switching element 7, the resonance coil 8, the transformer 9 and the smoothing coil 10, which are heat generating components of the DCDC converter 1, are connected. Cooling.
The inverter 2 is a chassis and includes an inverter cooler 13 in which a cooling medium flows, and a plurality of switching elements 14 and an input capacitor 15 disposed on the upper surface of the cooler 13. An inflow nipple 16 that is a cooling water channel into which the cooling medium flows is provided on one side surface of the cooler 13, and an outflow nipple 17 that is a cooling water channel from which the cooling medium flows out is provided on the other side surface. Yes. The cooling medium flowing in from the inflow nipple 16 flows out of the outflow nipple 17 through the inside of the cooler 13, and cools the switching element 14 and the input capacitor 15, which are heat generating components of the inverter 2.
Further, the converter cooler 4 and the inverter cooler 13 are arranged so that the inflow nipples 5 and 16 and the outflow nipples 6 and 17 as the respective cooling water channels are both substantially linear and substantially parallel. ing.

Further, in this embodiment, a structure is adopted in which the heat of the resonance coil 8, the transformer 9 and the smoothing coil 10, which are heat generating components of the DCDC converter 1, is propagated to the cover 3.
FIG. 4 shows a heat conducting member 19 that propagates the heat of the heat generating component of the DCDC converter 1 to the cover 3.
The heat conducting member 19 is composed of an elastic member whose middle portion protrudes in a curved shape toward the heat generating component, and both end portions are fixed to the cover 3 using screws 20.

In this in-vehicle power converter, the converter cooler 4 that cools the heat generating component of the DCDC converter 1 and the inverter cooler 13 that cools the heat generating component of the inverter 2 are separate from each other. The heat generating component and the DCDC converter 1 are disposed on opposite sides of the converter cooler 4.
Therefore, the converter cooler 4 suppresses the interference between the heat generated by the heat generating component of the DCDC converter 1 and the heat generated by the heat generating component of the inverter 2, and the heat generating components of the DCDC converter 1 and the inverter 2 are more than expected. It is possible to prevent the temperature from rising.
Further, when the DCDC converter 1 and the inverter 2 are thermally designed, the design of the distance between the heat generating components of the DCDC converter 1 and the design of the distance between the heat generating components of the inverter 2 are made with little consideration of mutual thermal interference. Thus, the DCDC converter 1 and the inverter 2 can each be reduced in size, and hence the in-vehicle power converter can be reduced.

Further, the heat of the resonance coil 8, the transformer 9, and the smoothing coil 10, which are each heat generating component of the DCDC converter 1, is transmitted to the converter cooler 4, but is also transmitted to the cover 3 through the heat conducting member 19. Therefore, the resonance coil 8, the transformer 9 and the smoothing coil 10 of the DCDC converter 1 are efficiently cooled.
Note that the heat of at least one of the heat generating components of the resonance coil 8, the transformer 9, and the smoothing coil 10 of the DCDC converter 1 may be propagated to the cover 3 via the heat conducting member 19.

Further, the converter cooler 4 and the inverter cooler 13 are arranged so that the inflow nipples 5 and 16 and the outflow nipples 6 and 17 as the respective cooling water channels are both substantially linear and substantially parallel. So it can be connected easily.
The cooling refrigerant to the converter cooler 4 and the inverter cooler 13 may be supplied separately, or may be supplied to the converter cooler 4 and then supplied to the inverter cooler 13. Good. Further, after being supplied to the inverter cooler 13, it may be continuously supplied to the converter cooler 4.
Further, the cooling water channels inside the converter cooler 4 and the inverter cooler 13 are not necessarily linear, and may be meandering, for example.

Embodiment 2. FIG.
FIG. 5 is an exploded perspective view showing an in-vehicle power conversion device according to Embodiment 2 of the present invention.
In this embodiment, converter cooler 4 </ b> A is provided with a surrounding portion 21 that surrounds switching element 7, resonance coil 8, transformer 9, and smoothing coil 10, which are heat-generating components, at the periphery.
In the first embodiment, the heat generating component of the DCDC converter 1 and the heat generating component of the inverter 2 are arranged on opposite sides of the converter cooler 4, but in this embodiment, the DCDC converter The heat generating component 1A and the heat generating component of the inverter 2 are both disposed on the same side of the converter cooler 4A so as to face each other.
At this time, among the heat generating components of the DCDC converter 1A, the tall transformer 9 or the smoothing coil 10 and the tall input capacitor 15 of the inverter 2 are arranged so as not to overlap.
The enclosure 21 surrounds the converter heat generating component and the inverter heat generating component when the inverter 2 and the DCDC converter 1A are integrated.
Other configurations are the same as those of the in-vehicle power conversion device according to the first embodiment.

  In the in-vehicle power conversion device of this embodiment, the DCDC converter cooler 4A has a surrounding portion 21 at the peripheral portion, and this surrounding portion 21 is obtained when the inverter 2 and the DCDC converter 1A are integrated. Since the heat generating component for the converter and the heat generating component for the inverter are enclosed, the need to newly cover the heat generating component for the converter and the heat generating component for the inverter is eliminated, and the number of parts and the material cost can be reduced. Compared with the in-vehicle power converter of Embodiment 1, the overall height can be lowered.

  Further, the heat generating component of the DCDC converter 1A and the heat generating component of the inverter 2 are arranged to face each other. Among the heat generating components of the DCDC converter 1A, the tall transformer 9 or the smoothing coil 10 and the inverter 2 are arranged. Since the input capacitors 15 are tall so as not to face each other, the overall height of the power converter can be reduced as compared with the in-vehicle power converter according to the first embodiment.

  In the above embodiment, the DCDC converter cooler 4A has the enclosure portion 21. However, in the inverter cooler, when the inverter and the DCDC converter are integrated in the peripheral portion, the converter heat generating component is used. And you may make it provide the enclosure part which encloses the heat-emitting component for inverters.

  1,1A DCDC conveyor, 2 inverter, 3 cover, 4,4A converter cooler, 5 inflow nipple (cooling water channel), 6 outflow nipple (cooling water channel), 7 switching element, 8 resonance coil, 9 transformer, 10 smoothing coil , 11 capacitor, 12 capacitor, 13 inverter cooler, 14 switching element, 15 input capacitor, 16 inflow nipple (cooling water channel), 17 outflow nipple (cooling water channel), 18 resistance, 19 heat conduction member, 20 screw, 21 enclosure Department.

Claims (6)

An inverter mounted on a vehicle for converting DC power to AC power;
In a vehicle-mounted power converter integrated with a DCDC converter that converts DC power into DC power having a different voltage,
The inverter includes an inverter heat generating component, and an inverter cooler on which the inverter heat generating component is mounted and cools the inverter heat generating component,
The DCDC converter includes a heat generating component for the converter and a DCDC converter cooler for mounting the heat generating component for the converter and cooling the heat generating component for the converter.
The in-vehicle power conversion device, wherein the inverter heat generating component and the converter heat generating component are respectively disposed on opposite sides of the DCDC converter cooler. A cover provided in the DCDC converter cooler and covering the heat generating component for the converter;
The vehicle-mounted vehicle according to claim 1, further comprising a heat conductive member provided between the cover and the heat generating component for the converter and elastically deformable and in surface contact with the cover and the heat generating component for the converter. Power conversion device.   The in-vehicle power converter according to claim 2, wherein the heat-generating component for converter that is in surface contact with the heat conducting member is at least one of a transformer and a coil. An inverter mounted on a vehicle for converting DC power to AC power;
In a vehicle-mounted power converter integrated with a DCDC converter that converts DC power into DC power having a different voltage,
The inverter includes an inverter heat generating component, and an inverter cooler on which the inverter heat generating component is mounted and cools the inverter heat generating component,
The DCDC converter includes a converter heat generating component, and a DCDC converter cooler that mounts the converter heat generating component facing the inverter heat generating component and cools the converter heat generating component.
The DCDC converter cooler or the inverter cooler has a surrounding portion provided around the converter heat generating component or the inverter heat generating component,
The in-vehicle power converter according to claim 1, wherein the enclosure surrounds the converter heat generating component and the inverter heat generating component when the inverter and the DCDC converter are integrated.   Among the heating components for the inverter and the heating components for the converter in the enclosure, the maximum heating component for the inverter and the maximum heating component for the converter are arranged so as not to face each other. The in-vehicle power conversion device according to claim 4, wherein the power conversion device is mounted on the vehicle.   The cooling water passage for entering and exiting the refrigerant into the inverter cooler and the cooling water passage for entering and exiting the refrigerant into the DCDC converter cooler are both linear and parallel. The in-vehicle power converter according to any one of claims 1 to 5.

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