JP3689087B2 - Power converter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a configuration of a power converter, particularly an inverter, mounted on a moving body such as a vehicle.
[0002]
[Prior art]
In recent years, various AC motors have been mounted on vehicles, and AC power is obtained from a battery mounted on the vehicle by an inverter (hereinafter referred to as a power converter) and supplied to the motor. Since the motor performs torque control by PWM control of the power converter, when a plurality of AC motors with different control contents are used, the number of power converters corresponding to the difference in the control contents is required. become. On the other hand, since the equipment mounted on the vehicle is required to be small and light, such a power converter also uses a liquid cooling method as a cooling method, and two sets of power converters are integrally mounted on a heat sink. There is an attempt.
[0003]
As a configuration in which two sets of power converters are integrated as described above, the configuration is disclosed in Patent Document 1 although it is not a vehicle power converter. The integrated configuration disclosed in this publication is such that two power converters are provided on both sides of a single water-cooled heat sink as shown in FIG. In Patent Document 2, a smoothing capacitor is connected between positive and negative buses that supply DC power to two sets of power converters, and the high frequency impedance from the power converter to the capacitor is smaller than the high frequency impedance from the power source to the capacitor. Thus, it is disclosed that two sets of inverters share a smoothing capacitor.
[0004]
Among the conventional examples described above, in the case where two sets of power converters as disclosed in Patent Document 1 are integrated, it is usual to provide a power input terminal for each of the two sets of power converters. Also in Patent Document 1, it can be determined from the comparison between FIG. 14 and the like in FIG. 9 and the above FIG. 9 that the power input terminal and the capacitor are mounted on each of the inverters provided on both surfaces of the heat sink. Moreover, although the capacitor | condenser for smoothing is shared from the content disclosed by patent document 2, it is determined that each of the two sets of inverters has an independent configuration, and each has a power input terminal. Therefore, it can be determined that the smoothing capacitor is provided separately from the two sets of inverters.
[0005]
[Patent Document 1]
Japanese Unexamined Patent Publication No. 09-107683 (page 3, page 6, FIG. 9, FIG. 14)
[Patent Document 2]
JP 2002-51566 A (4th page, 6th page, FIG. 1)
[0006]
[Problems to be solved by the invention]
As mentioned above, equipment mounted on the vehicle is required to be small and light, but the power converter is cooled by a liquid cooling system, and the two power converters are integrated to achieve a sufficiently small size. However, in a vehicle equipped with a large number of electric control devices, it is necessary to simplify the wiring to the power converter as much as possible in order to improve workability and reliability. Further, in order to be mounted on a vehicle having a large vibration, it is necessary to have a configuration in consideration of vibration resistance.
[0007]
The present invention has been made to solve such a problem, and obtains a power conversion device that is small and light with respect to a vehicle that uses a plurality of power converters, that is easy in wiring work and excellent in vibration resistance. It is for the purpose.
[0008]
[Means for Solving the Problems]
The power conversion device according to the present invention includes a liquid cooling type heat sink having a cooling liquid passage therein, and two sets of power conversions mounted on both sides of the heat sink, each having a semiconductor module, a control circuit, and a smoothing capacitor. Of the two sets of power converters, one of the power converters has an input terminal for receiving power supply from the power source, and the other power converter is between the two sets of power converters. The heat sink is arranged so that a pair of comb-shaped cooling fins engage with each other, and the coolant passage is formed between the adjacent cooling fins. In addition, mounting legs are provided outside the opposing sides, and the cooling fins extend from one side of the opposing sides provided with the mounting legs toward the other side. Formation The is intended.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
1 to 5 illustrate a power conversion apparatus according to Embodiment 1 of the present invention. FIG. 1 is a perspective view showing an external configuration, and FIG. 2 shows a part of the internal configuration with a cover removed. 3 is a perspective view showing a state in which the capacitor is removed from FIG. 2, FIG. 4 is a cross-sectional view showing a cross section of the AA portion in FIG. 3, and FIG. 5 is a perspective view of FIG. It is.
[0010]
As shown in FIG. 1, the power converter according to this embodiment includes a first power converter 2 on the upper surface of a heat sink 1, which will be described in detail later, and a second power converter 3 on the lower surface of the heat sink 1. Is the one that is attached. The heat sink 1 is provided with a coolant passage as described later with reference to FIG. 7 and an nipple 4 for taking in and discharging the coolant. In addition, on the opposite sides of the heat sink 1, there are provided, for example, tripods on one side for mounting legs 1c for mounting the power conversion device to a vehicle mounting member (not shown).
[0011]
As described above, the first power converter 2 is attached to one surface of the heat sink 1 and the second power converter 3 is attached to the other surface. 2, a cover 5 is provided in the cover 5. As shown in FIGS. 2 to 5, a semiconductor module 6 constituting an inverter is disposed inside the cover 5, and one power converter includes the semiconductor module 6. A capacitor 7 (see FIG. 2) for absorbing ripples associated with the operation is attached. And the connector 9 which has the input terminal 8 common to the 1st power converter 2 and the 2nd power converter 3 is provided in the side surface of the 1st power converter 2, and from direct current power supplies, such as a battery which is not illustrated Are connected to the positive and negative electrodes of the capacitor 7 from the input terminal 8 and distributed to the first power converter 2 and the second power converter 3.
[0012]
As a specific configuration, for example, when the capacitor 7 is provided on the first power converter 2 side, the connector 9 is also provided on the first power converter 2 side. The power converter is constructed by incorporating all the components necessary for the configuration of the inverter as the power converter, such as the semiconductor module 6, its control circuit, the capacitor 7, and the current detecting means for feedback control. On the second power converter 3 side, a power converter is constructed with all components except the input terminal and the capacitor, and the second power converter 3 and the second power converter 3 are installed in the connector 9 provided in the first power converter 2. A power supply line for connecting the first power converter 2 is provided, and the second power converter 3 is input to the first power converter 2 via the power supply line when the power converter is assembled. Connected to terminal 8 and capacitor 7. Note that a capacitor 7 can be built in the second power converter 3 as required, and only the connector 9 having the input terminal 8 can be shared.
[0013]
As described above, in the power conversion device according to this embodiment, two sets of power converters are mounted on one heat sink, and the connector 9 having the input terminal 8 and the capacitor 7 are provided on one power converter. Since the other power converter is connected to the capacitor 7 and the input terminal 8 by the power line provided in 9, the wiring cable from the battery serving as the power source and the connection work are halved when assembled to the vehicle. In addition, since a capacitor built in one power converter is shared, it is not necessary to provide a capacitor in the other power converter, and the manufacturing cost and weight can be reduced. .
[0014]
Figure 6 is a and 7 serve to explain the heat sink to be used for power conversion apparatus according to Embodiment 1 of the present invention, FIG. 6 is a perspective view showing the appearance, FIG. 7 is a perspective view showing the internal structure. The heat sink 1 includes an upper lid 10 and a heat sink body 1a. The heat sink body 1a is provided with a coolant passage 1d divided by a plurality of cooling fins 1b. Coolant flowing from one nipple 4 passes through the coolant passage 1d. The coolant circulates and is discharged from the other nipple 4, and the coolant passage 1 d is sealed by attaching the upper lid 10 to the heat sink body 1 a.
[0015]
As shown in FIG. 7, the cooling fins 1 b are arranged so that a pair of comb-shaped cooling fins 1 b extending from one side of the opposite sides provided with the mounting legs 1 c toward the other side mesh with each other. By providing a gap between the tip of one cooling fin 1b and the base of the other cooling fin 1b, a cooling liquid passage 1d is formed between the opposing comb-shaped cooling fins 1b.
[0016]
By providing the cooling fin 1b in this way, the cross-sectional secondary moment between the opposing sides on which the mounting legs 1c of the heat sink body 1a are provided can be increased, and the cooling fin 1b can be used as a strength member of the heat sink body 1a. The heat resistance of the heat sink 1 and thus the vibration resistance of the power converter can be improved, and the heat sink body 1a and the upper lid 10 made of, for example, die casting can be thinned to reduce the weight. It will be possible.
[0017]
【The invention's effect】
As described above, according to the power conversion device of the present invention, the liquid cooling type heat sink having the cooling liquid passage therein and the both sides of the heat sink are mounted, the semiconductor module, the control circuit, and the smoothing capacitor, respectively. Of the two sets of power converters, one of the power converters has an input terminal for receiving power supply from the power source, and the other power converter has two sets of power converters. A power supply line connected between a pair of power converters is configured to receive power , and the heat sink is arranged so that a pair of comb-shaped cooling fins are engaged with each other, and between adjacent cooling fins. The cooling fluid passage is formed and has mounting legs outside the opposing sides, and the cooling fins are arranged from one side to the other side of the opposing sides where the mounting legs are provided. Heading to Since formed to be extended, it is possible to half the distribution cable and connection work from a power supply battery, it is possible to obtain a good power conversion device workability with lightening. In addition, it is possible to increase the cross-sectional secondary moment between the opposing sides provided with the mounting legs of the heat sink body, the cooling fin can function as a strength member of the heat sink body, As a result, it is possible to improve the vibration resistance of the power conversion device, and it is possible to reduce the weight by reducing the thickness of the heat sink body and the upper lid made of, for example, die casting.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an external configuration of a power conversion device according to Embodiment 1 of the present invention.
FIG. 2 is a perspective view showing a part of the internal configuration of the power conversion device according to embodiment 1 of the present invention.
FIG. 3 is a perspective view showing a part of the internal configuration of the power conversion device according to embodiment 1 of the present invention.
FIG. 4 is a cross-sectional view of the power conversion device according to embodiment 1 of the present invention.
FIG. 5 is a perspective view of the power conversion device according to the first embodiment of the present invention in a cross-sectional state.
FIG. 6 is a perspective view showing an external appearance of a heat sink used in the power conversion device according to Embodiment 1 of the present invention.
FIG. 7 is a perspective view showing an internal configuration of a heat sink used in the power conversion device according to Embodiment 1 of the present invention.
[Explanation of symbols]
1 heat sink, 1a heat sink body, 1b cooling fin,
1c mounting leg, 1d coolant passage, 2 first power converter,
3 Second power converter, 4 nipple, 5 cover,
6 semiconductor modules, 7 capacitors, 8 input terminals,
9 Connector, 10 Upper lid.

Claims (2)

A liquid-cooled heat sink having a coolant passage therein, and two sets of power converters mounted on both sides of the heat sink, each having a semiconductor module, a control circuit, and a smoothing capacitor, the two sets of power Of the converters, one power converter has an input terminal for receiving power supply from a power source, and the other power converter is supplied with power from a power supply line connecting the two power converters. The heat sink is arranged so that a pair of comb-shaped cooling fins mesh with each other, the cooling fluid passage is formed between the adjacent cooling fins, and the outside of the opposite sides And the cooling fin is formed so as to extend from one side of the opposite sides provided with the mounting leg toward the other side. You Power converter.   A power supply line connecting the two power converters is connected to the smoothing capacitor provided in the one power converter, so that the smoothing capacitor on the other power converter side The power conversion device according to claim 1, wherein the power conversion device is excluded.

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