JP2015173565A - Electric power conversion system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric power conversion system which inhibits a coolant from intruding into a metal case in which at least one of a DC/DC converter and a power module is installed and inhibits heat transmission from a reactor to a capacitor.SOLUTION: A reactor 24 and a primary side capacitor 22 are disposed at a metal case 40. A terminal board 80 is inserted into a space between the reactor 24 and the primary side capacitor 22, and a joint part between the metal case 40 and a metal case 70 is covered by an end part 82b of an insertion part 82 of the terminal board 80. The structure inhibits a coolant from intruding into the metal case 70 and also inhibits heat from being transmitted from the reactor 24 to the primary side capacitor 22, a secondary side capacitor 26, and a snubber capacitor 29.

Description

  The present invention relates to a power conversion device, and more particularly, to a power conversion device including a reactor, a capacitor, and at least one of a DCDC converter and a power module.

  Conventionally, as this type of power converter, a reactor and a capacitor are housed in a housing case, a reactor connection terminal connected to the reactor, a capacitor connection terminal connected to the capacitor, and a power connection terminal connected to a DC power source Is connected to the positive bus bar (for example, see Patent Document 1). In this power converter, in the positive bus bar, the length of the path through which heat is transferred from the reactor connection terminal to the capacitor connection terminal is made longer than the length of the path through which heat is transferred from the reactor connection terminal to the power supply connection terminal. It suppresses the heat from being transmitted and suppresses the temperature rise of the capacitor.

JP 2013-169075 A

  By the way, the metal case which accommodated the DCDC converter and the power module is installed on the back side of the surface where the reactor and the capacitor in the housing case of such a power converter are installed, and the back surface of the housing case and the back surface of the metal case are joined to each other. When the cooling water is supplied to the space formed by the back surface of the storage case and the back surface of the metal case, the storage case and the metal case In some cases, the cooling water leaks from the joints, and the cooling water enters the metal case. Such intrusion of cooling water adversely affects the DCDC converter and the power module, so it is desirable to be suppressed. Moreover, in the above-mentioned power converter, since the reactor connection terminal and the capacitor connection terminal are connected to the positive electrode bus bar, the heat generated in the reactor easily propagates to the capacitor via the positive electrode bus bar. It is desirable that such heat propagation is suppressed because it causes the capacitor to rise in temperature.

  The main purpose of the power converter of the present invention is to suppress the penetration of cooling water into the metal case in which at least one of the DCDC converter and the power module is installed, and to suppress the propagation of heat from the reactor to the condenser. .

  The power converter of the present invention employs the following means in order to achieve the main object described above.

The power converter of the present invention is
A power conversion device including a reactor, a capacitor, and at least one of a DCDC converter and a power module,
A first metal case in which the reactor and the capacitor are disposed inside;
A second metal case in which at least one of the DCDC converter and the power module is disposed inside;
A terminal block to which a reactor bus bar connected to the reactor and a capacitor bus bar connected to the capacitor are connected;
With
One side of the first metal case and one side of the second metal case are joined to each other and formed into a shape that forms a cooling water channel when joined.
The terminal block is inserted between the reactor and the capacitor so as to penetrate one side surface of the first metal case and one side surface of the second metal case, and an end portion on the first metal case side is formed. The gist is that the end portion on the second metal case side is connected to the reactor bus bar and the capacitor bus bar and covers the joint portion between the first metal case and the second metal case.

  In this power conversion device of the present invention, the terminal block is inserted from between the reactor and the capacitor so as to penetrate one side surface of the first metal case and one side surface of the second metal case, The end portion is connected to the reactor bus bar and the capacitor bus bar, and the end portion on the second metal case side covers the joint portion between the first metal case and the second metal case. Thereby, even when the cooling water supplied to the cooling water channel formed by one side surface of the first metal case and one side surface of the second metal case leaks from the joint between the first metal case and the second metal case. Intrusion of cooling water into the second metal case can be suppressed at the end of the terminal block on the second metal case side. Further, since the terminal block is inserted between the reactor and the capacitor, it is possible to suppress the propagation of heat from the reactor to the capacitor. As a result, it is possible to suppress the penetration of cooling water into the second metal case in which at least one of the DCDC converter and the power module is installed, and to suppress the propagation of heat from the reactor to the capacitor.

It is a block diagram which shows the outline of a structure of the power converter device 20 as one Example of this invention. 3 is a cross-sectional view of a main part showing a cross section of a main part of the power conversion device 20. FIG. It is an expanded sectional view of the part enclosed with the broken line of FIG.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a block diagram showing an outline of the configuration of a power conversion device 20 as an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a main portion of the power conversion device 20, and FIG. It is an expanded sectional view of the part enclosed with the broken line of FIG. In addition, in FIG. 1, the heat conductive insulating member 30 mentioned later is not shown in figure for description of the structure in the power converter device 20. FIG. The power conversion device 20 is a device that converts power from a power source (not shown), and is stored by a smoothing primary capacitor 22, a reactor 24, a smoothing secondary capacitor 26, and a secondary capacitor 26. A metal case 40 in which a discharge resistor 28 for discharging electric charge and a snubber capacitor 29 are accommodated, a metal case 70 that is joined to the metal case 40 and accommodates a DCDC converter 72 and a power module 74, and a metal case 40 The terminal block 80 is inserted through the central portion and the central portion of the metal case 70.

  The metal case 40 is made of a metal having a relatively good thermal conductivity such as aluminum, and the reactor 24, the primary side capacitor 22, the secondary side capacitor 26, and the snubber capacitor 29 are arranged inside.

 The metal case 70 is made of a metal having a relatively good thermal conductivity such as aluminum, and has a bottom portion 70b on which the DCDC converter 72 and the power module 74 are placed, and a cover attached to cover the bottom portion 70b. 70c.

  The outer periphery of the side surface 70a of the metal case 70 (the surface on the back side of the surface on which the DCDC converter 72 and the power module 74 on the bottom 70b are mounted) is the surface 40a (the surface on which the reactor 24 and the primary capacitor 22 are disposed). The center portion of the side surface 70a (the peripheral portion of the terminal block 80) is bonded to the central portion of the side surface 40a (the peripheral portion of the terminal block 80). The side surface 70a of the metal case 70 and the side surface 40a of the metal case 40 are formed in a shape that forms a cooling water channel when joined. Cooling water is supplied from the cooling water supply port 44a to the space S formed by the side surface 70a of the metal case 70 and the side surface 40a of the metal case 40, and the cooling water flowing through the space S is discharged from the cooling water discharge port 44b. Is done. As shown in FIG. 3, a seal 90 that suppresses leakage of cooling water from the space S is provided at the joint between the metal case 40 and the metal case 70.

  Bus bars 50 to 60, 62, 64 extending from the respective side surfaces to the end portion 82a on the metal case 40 side of the terminal block 80 are connected to the primary side capacitor 22, the secondary side capacitor 26, the reactor 24, and the snubber capacitor 29. ing. A bus bar 62 connected to the bus bar 58 of the secondary capacitor 26 and a bus bar 64 connected to the bus bar 52 of the primary capacitor 22 and the bus bar 60 of the secondary capacitor 26 are connected to the discharge resistor 28. Yes.

  The terminal block 80 is formed of an insulating material having a relatively good thermal conductivity such as an epoxy resin, and the metal case 70 is interposed between the reactor 24 of the metal case 40 and the primary side capacitor 22, the secondary side capacitor 26, and the snubber capacitor 29. An insertion portion 82 inserted so as to penetrate the metal case 40, connection terminals 84 a to 84 g formed of a conductive material such as aluminum provided at an end portion 82 a on the metal case 40 side of the insertion portion 82, and a metal case 70 of the insertion portion 82. A connection terminal 84h provided on the side end portion 82b and formed of a conductive material such as aluminum, and a connection terminal 84b and a connection terminal 84h formed of a conductive material such as aluminum and arranged inside the insertion portion 82. And an internal wiring 86 to be connected.

  The connection terminals 84a, 84c to 84g are connected to the bus bars 50, 68, 66, 60, 54, 58, respectively. The connection terminal 84 b is connected to the bus bar 52 of the primary capacitor 22 and the bus bar 54 of the reactor 24. The connection terminal 84 h is connected to the bus bar 66 connected to the DCDC converter 72 in the metal case 70 and the bus bar 68 connected to the power module 74.

  The end portion 82 b of the insertion portion 82 is formed in a shape that covers a joint portion (joint portion provided with the seal 92) between the central portion of the metal case 40 and the central portion of the metal case 70. Seals 92 and 94 for suppressing leakage of cooling water from the space S are provided at the joints between the end portion 82 b and the metal case 40 and the metal case 70.

  In the power conversion device 20 configured as described above, the end portion 82b of the insertion portion 82 covers the joint portion between the metal case 40 and the metal case 70 (joint portion to which the seals 90 to 94 are attached), thereby cooling water from the space S. Even when the battery leaks, the seals 90 to 94 and the end portion 82b can further suppress the penetration of the cooling water into the metal case 70, and damage to the DCDC converter 72 and the power module 74 due to the penetration of the cooling water can be prevented. It can be suppressed more. Further, since the terminal block 80 is disposed between the reactor 24 and the primary side capacitor 22, the secondary side capacitor 26, and the snubber capacitor 29, the primary side capacitor 22, the secondary side capacitor 26, and the snubber capacitor 29 are provided from the reactor 24. Propagation of heat to can be suppressed. Therefore, intrusion of the cooling water into the metal case 70 can be suppressed, and propagation of heat from the reactor 24 to the primary side capacitor 22, the secondary side capacitor 26, and the snubber capacitor 29 can be suppressed.

  According to the power conversion device 20 of the embodiment described above, the reactor 24, the primary side capacitor 22, the secondary side capacitor 26, and the snubber capacitor 29 are arranged in the metal case 40, and the reactor 24, the primary side capacitor 22, and the secondary side are arranged. The terminal block 80 is inserted between the side capacitor 26 and the snubber capacitor 29, and the joint portion between the metal case 40 and the metal case 70 is covered with the end 82 b of the insertion portion 82 of the terminal block 80. It is possible to suppress the penetration of cooling water into the reactor and to suppress the propagation of heat from the reactor 24 to the primary side capacitor 22, the secondary side capacitor 26, and the snubber capacitor 29.

  In the power conversion device 20 of the embodiment, the power conversion device 20 is mounted with the reactor 24, the primary side capacitor 22, the secondary side capacitor 26, and the discharge resistor 28, but the discharge resistor 28 is not mounted. One of the primary side capacitor 22 and the secondary side capacitor 26 may not be mounted.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the reactor 24 corresponds to a “reactor”, the primary capacitor 22 corresponds to a “capacitor”, the DCDC converter 72 corresponds to a “DCDC converter”, the power module 74 corresponds to a “power module”, The metal case 40 corresponds to a “first metal case”, the metal case 70 corresponds to a “second metal case”, and the terminal block 80 corresponds to a “terminal block”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention is applicable to the manufacturing industry of power conversion devices.

  20 Power Converter, 22 Primary Capacitor, 24 Reactor, 26 Secondary Capacitor, 28 Discharge Resistance, 29 Snubber Capacitor, 30 Thermal Conductive Insulating Member, 40, 70 Metal Case, 40a, 70a Side, 44a Cooling Water Supply Port 44b Cooling water outlet, 50-68 bus bar, 70b bottom, 70c cover, 72 DCDC converter, 74 power module, 80 terminal block, 82 insertion section, 82a, 82b end, 84a-84h connection terminal, 86 internal wiring, 90-94 seal, S space.

Claims (1)

A power conversion device including a reactor, a capacitor, and at least one of a DCDC converter and a power module,
A first metal case in which the reactor and the capacitor are disposed inside;
A second metal case in which at least one of the DCDC converter and the power module is disposed inside;
A terminal block to which a reactor bus bar connected to the reactor and a capacitor bus bar connected to the capacitor are connected;
With
One side of the first metal case and one side of the second metal case are joined to each other and formed into a shape that forms a cooling water channel when joined.
The terminal block is inserted between the reactor and the capacitor so as to penetrate one side surface of the first metal case and one side surface of the second metal case, and an end portion on the first metal case side is formed. A power conversion device connected to the reactor bus bar and the capacitor bus bar, wherein an end portion on the second metal case side covers a joint portion between the first metal case and the second metal case.

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