JP2012139037A - Structure of inverter circuit body and electric compressor using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of an inverter circuit body which does not need a base member and is easily assembled.SOLUTION: This invention relates to a structure of an inverter circuit body 11 comprising: multiple switching elements 12, respectively composing arms of an inverter circuit; a control board in which a control circuit controlling these switching elements 12 is formed; and a bus bar electrode 14 connecting the control board with the switching elements 12. The switching elements 12 are mounted on the bus bar 14, and heat radiation parts 16, where heat is transmitted from a heat radiation surface of each switching element 12, are provided at the bus bar 14.

Description

  The present invention relates to a structure of an inverter circuit body used in a vehicle and an electric compressor using the inverter circuit body.

  Conventionally, as a structure of an inverter circuit body for driving an electric compressor for vehicles, for example, a structure of an inverter circuit body described in Japanese Patent No. 3760887 (Patent Document 1) has been proposed.

  The inverter circuit described in Patent Document 1 includes six power MOS transistor modules (switching elements), a smoothing capacitor, a bus bar built-in plate / outer frame portion, a printed circuit board, and a cover plate. The DC power fed from is converted into three-phase AC power and fed.

  However, the inverter circuit described in Patent Document 1 has a problem that a switching element is mounted on a housing (heat radiating plate), and a bus bar is attached to the housing on which the switching element is mounted, so that only the inverter part cannot be detached. To do.

  Further, since the connection work for attaching the bus bar and the switching element is performed after the switching element is mounted on the housing, there is a problem that workability is poor. Furthermore, in order to secure a work space, the problem that an inverter circuit body enlarges generate | occur | produces.

  Therefore, as a structure in which a switching element (IGBT) is mounted on the base using the base, for example, the structure of an inverter circuit body described in JP 2007-230661 A (Patent Document 2) has been proposed.

  The inverter circuit body described in Patent Document 2 includes a substrate having an electric circuit including a switching element, a component such as a capacitor and a coil, and a base that supports the substrate and the component, and is attached to and detached from the inverter accommodating chamber of the housing. It is fixed as possible.

Japanese Patent No. 3760887 JP 2007-263061 A

  However, in the structure of the inverter circuit body described in Patent Document 2, when the electric compressor is assembled, components such as a switching element and a coil are inserted into the substrate at a time, which causes a problem that the assembly is difficult.

  Accordingly, the present invention has been made to solve such a conventional problem, and an object thereof is to provide a structure of an inverter circuit body that does not require a base member and can be easily assembled, and an electric compressor using the same. Is to provide.

  In order to achieve the above object, an invention according to claim 1 of the present application includes a plurality of switching elements constituting each arm of an inverter circuit, a control board on which a control circuit for controlling these switching elements is formed, and this control. A structure of an inverter circuit body including a bus bar electrode for connecting a substrate and the switching element, wherein the switching element is mounted on the bus bar electrode, and heat is transmitted from a heat radiation surface of the switching element. Is provided on the bus bar electrode.

The invention according to claim 2 is the structure of the inverter circuit body according to claim 1, wherein the bus bar electrode is mounted with and connected to the bus bar body and the switching element, and heat of the switching element is transmitted. The bus bar electrode is resin-molded with the output terminal portion exposed to the outside. The heat radiating portion is formed with an output terminal portion that outputs power by a switching element.

  Invention of Claim 3 is the structure of the inverter circuit body of Claim 1 or Claim 2, Comprising: A heat sink is formed in the back surface side of the said switching element, The said heat sink via an adhesion | attachment means It is connected to the heat dissipation part of the bus bar electrode.

  A fourth aspect of the present invention is the structure of the inverter circuit body according to any one of the first to third aspects, wherein the heat dissipating part of the bus bar electrode is a switching element constituting a negative arm. Is formed by a minus side heat radiating part on which is mounted, and a plus side heat radiating part on which the switching element constituting the plus side arm is formed so as to face the minus side heat radiating part in a planar direction. And

  According to a fifth aspect of the present invention, the electric compressor includes an inverter unit in which the inverter circuit body according to any one of the first to fourth aspects is incorporated, and a motor unit whose drive is controlled by the inverter unit. And a compression mechanism portion that compresses the refrigerant by the rotational driving force of the motor portion, an inverter accommodation chamber that accommodates the inverter portion, and a housing that accommodates the motor portion and the compression mechanism portion. It is characterized by that.

  According to the first aspect of the present invention, since the switching element is mounted on the bus bar electrode and the heat radiating portion for transferring heat from the heat radiating surface of the switching element is provided on the bus bar electrode, the inverter circuit body is used without using the base plate. The switching element and the bus bar electrode can be assembled to the inverter circuit body, and the inverter circuit body can be detached from the housing.

  Further, since the heat radiating portion for transferring heat from the heat radiating surface of the switching element is provided on the bus bar electrode, a separate heat radiating plate is not required.

  Therefore, an inverter circuit body that does not require a base member and can be easily assembled can be provided.

  According to the second aspect of the present invention, since the bus bar electrode is provided with the heat radiating portion to which the heat of the switching element is transmitted, the heat generated in the switching element can be released to cool the switching element.

  According to invention of Claim 3, the heat sink is connected with the thermal radiation part of the bus-bar through the contact | adherence means. Therefore, the switching element and the bus bar can be brought into close contact with each other through the close contact means, and the switching element and the bus bar can be easily assembled to the inverter circuit body.

  According to the fourth aspect of the present invention, since the plus-side heat radiating portion is formed so as to face the minus-side heat radiating portion in the planar direction, the structure of the bus bar is substantially straight, and the process of managing the component parts is reduced. Thus, the manufacturing cost can be reduced.

  According to the invention described in claim 5, since the switching element is mounted on the bus bar electrode and the heat radiating portion for transferring heat from the heat radiating surface of the switching element is provided on the bus bar electrode, the inverter circuit body is used without using the base plate. A switching element and a bus bar electrode can be assembled to the. Further, since the base member is not used as in the first aspect, the inverter circuit body can be attached and detached, and the inverter circuit body can be attached and detached from the housing.

  Further, since the heat radiating portion for transferring heat from the heat radiating surface of the switching element is provided on the bus bar electrode, a separate heat radiating plate is not required.

  Therefore, an electric compressor using an inverter circuit body that does not require a base member and can be easily assembled can be provided.

It is a figure which shows the surface of the inverter circuit body which concerns on embodiment of this invention. It is a figure which shows the back surface of the inverter circuit body which concerns on embodiment of this invention. It is a top view for demonstrating the thermal radiation part which concerns on embodiment of this invention. It is a top view which shows the switching element which concerns on embodiment of this invention. It is a figure for demonstrating the contact | adherence means which concerns on embodiment of this invention. It is a top view which shows the back surface of the switching element which concerns on embodiment of this invention. It is a figure which shows the electric compressor which concerns on embodiment of this invention. It is a figure which shows the thermal radiation structure of the electric compressor which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. First, the structure of an inverter circuit body used in the electric compressor according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3.

  FIG. 1 is a diagram illustrating a surface of an inverter circuit body according to an embodiment of the present invention. FIG. 2 is a view showing the back surface of the inverter circuit body according to the embodiment of the present invention. FIG. 3 is a plan view for explaining the heat dissipating part according to the embodiment of the present invention.

  The electric compressor according to the embodiment of the present invention is applied to a refrigeration cycle of a vehicle air conditioner, and a fluid compressed by the electric compressor becomes a refrigerant of the refrigeration cycle. The inverter circuit body controls the driving of the motor unit that is integrally assembled with the electric compressor.

  As shown in FIG. 1 to FIG. 3, the inverter circuit body 11 includes an IGBT 12 (see FIG. 4 described later) as a plurality of switching elements 12 constituting each arm of the inverter circuit body 11, and a control circuit that controls the IGBT 12. The control board (illustration omitted) formed and the bus bar (bus-bar electrode) 14 which connects a control board and IGBT12 are comprised substantially.

  The IGBT 12 is mounted on the bus bar 14, and includes a minus side IGBT 12a constituting a minus side arm and a plus side IGBT 12b constituting a plus side arm (see FIG. 4 described later).

  The minus-side IGBT 12a and the plus-side IGBT 12b are arranged so as to face each other in the plane direction A (the direction of arrow A in FIG. 3), and the center O (see FIG. 4 described later) of the minus-side IGBT 12a and the plus-side IGBT 12b does not overlap each other. Is arranged.

  Thus, since the center O (see FIG. 4 described later) of the minus side IGBT 12a and the plus side IGBT 12b is arranged so as not to overlap each other, the structure of the bus bar 14 is substantially linear, and the inverter circuit body 11 is enlarged. There is nothing to do. In addition, the manufacturing cost can be reduced by reducing the number of steps for managing the component parts.

  The bus bar (bus bar electrode) 14 is disposed on the low temperature side of the electric compressor, and includes a bus bar main body portion 15 on which the IGBT 12 is mounted, a heat radiating portion 16 to which heat is transmitted from the heat radiating surface B of the IGBT 12 (see FIG. 2), and the IGBT 12. An output terminal unit 17 that outputs electric power and an input terminal unit 18 that inputs electric power from a motor (not shown) are configured.

As described above, the IGBT 12 is mounted on the bus bar 14 and the heat radiating portion 16 to which heat is transmitted from the heat radiating surface B (see FIG. 2) of the IGBT 12 is provided on the bus bar 14. The IGBT 12 and the bus bar 14 can be assembled.

  Moreover, since the heat radiating part 16 to which heat is transmitted from the heat radiating surface B (see FIG. 2) of the IGBT 12 is provided on the bus bar 14, a separate heat radiating plate is not required. For this reason, the manufacturing cost can be reduced by reducing the number of components.

  Further, the bus bar 14 is formed by resin molding in a state where the output terminal portion 17 is exposed to the outside.

  The bus bar main body 15 includes a switching element fixing portion 19 that fixes the IGBT 12. The bus bar 14 on the back surface of the switching element fixing portion 19 is exposed to the outside, and dissipates heat generated in the IGBT 12.

  The heat dissipating part 16 is formed so as to face the negative heat dissipating part 16a on which the negative IGBT 12a is mounted and the negative heat dissipating part 16a in the planar direction A (see arrow A in FIG. 3), and the positive IGBT 12b is mounted on the heat dissipating part 16a. And a plus-side heat radiation portion 16b.

  Thus, since the plus-side heat radiation portion 16b is formed so as to face the minus-side heat radiation portion 16a in the planar direction A (see arrow A in FIG. 3), the structure of the bus bar 14 is substantially linear, and the inverter circuit body 11 does not increase in size. In addition, the manufacturing cost can be reduced by reducing the number of steps for managing the component parts.

  Next, with reference to FIG. 4 to FIG. 6, the switching element and the heat dissipation part of the inverter circuit body according to the embodiment of the present invention will be described in detail. FIG. 4 is a plan view showing the switching element according to the embodiment of the present invention.

  Moreover, FIG. 5 is a figure for demonstrating the thermal radiation part of the inverter circuit body which concerns on embodiment of this invention. FIG. 6 is a plan view showing the back surface of the switching element according to the embodiment of the present invention.

  As shown in FIG. 4, the IGBT 12 includes a gate 21, an emitter 22, and a collector 23 connected to the output terminal unit 17 or the input terminal unit 18.

  The emitter 22 on the positive side 24 of the inverter circuit body 11 and the collector 23 on the negative side 25 of the inverter circuit body 11 are connected to the output terminal portion 17.

  The collector 23 on the plus side 24 of the inverter circuit body 11 and the emitter 22 on the minus side 25 of the inverter circuit body 11 are connected to the input terminal portion 18.

  As shown in FIG. 4, since the center O (see FIG. 4 described later) of the minus side IGBT 12a and the plus side IGBT 12b is arranged so as not to overlap each other, the emitter 22 and the collector 23 should be arranged in a straight line. The inverter circuit body 11 can be reduced in size.

  As shown in FIGS. 5 and 6, the rear surface side of the IGBT 12 is formed on the heat radiating plate 26, and the heat radiating plate 26 is connected to the heat radiating portion 16 (see FIG. 4) of the bus bar 14 through the close contact means 27.

  The heat sink 26 of the IGBT 12 is set to the same potential as the collector 23, the collector 23 on the minus side 25 is connected to the output terminal portion 17, and the collector 23 on the plus side 24 is connected to the input terminal portion 18 (see FIG. 4).

  And the insulation between the heat sink 26 and IGBT12 becomes unnecessary by arrange | positioning the bus-bar 14 connected to the output terminal part 17 and the input terminal part 18 in the back surface of IGBT12 (refer FIG. 4).

  Therefore, by adopting a structure in which the IGBT 12 and the bus bar 14 are brought into close contact with each other through the close contact means 27, the inverter circuit body 11 can be easily assembled to the inverter circuit body 11 and a separate heat sink is not required. Can be provided.

  In addition, as a contact | adherence means, a heat dissipation sheet, grease, etc. are employable.

  Next, with reference to FIG.7 and FIG.8, the electric compressor using the inverter circuit body mentioned above is demonstrated. FIG. 7 is a diagram illustrating an electric compressor according to an embodiment of the present invention. Fig.8 (a) is a top view which shows the inverter part 2 which concerns on embodiment of this invention. FIG.8 (b) is a figure which shows the thermal radiation structure of the electric compressor which concerns on embodiment of this invention.

  As shown in FIG. 7, the electric compressor 1 compresses the refrigerant by the inverter unit 2 in which the inverter circuit body 11 is incorporated, the motor unit 3 whose driving is controlled by the inverter unit 2, and the rotational driving force of the motor unit 3. The compression mechanism part 4 which performs, the inverter accommodating chamber 5 in which the inverter part 2 is accommodated, and the housing 6 in which the motor part 3 and the compression mechanism part 4 are accommodated.

  The inverter unit 2 converts DC power output from a battery (not shown) mounted on the vehicle into three-phase AC power and outputs it to the motor unit 3.

  The motor unit 3 drives the compression mechanism unit, and includes a drive shaft 31 penetrating substantially the center of the motor unit 3, a rotor 32 fitted into the drive shaft 31, and further provided on the outer peripheral side thereof. 3 is a three-phase synchronous motor including a stator 34 around which winding 33 is wound.

  In the compression mechanism unit 4, the refrigerant is compressed by the rotation of the rotary rotor in the cylinder block 41 with the rotation of the drive shaft 31 of the motor unit 3.

  The inverter accommodating chamber 5 and the housing 6 are configured such that the inverter unit 2 in which the inverter circuit body 11 is incorporated is arranged on the low temperature side. For this reason, the damage accompanying IGBT12 (refer FIG. 4) generating heat can be avoided.

  Then, the refrigerant sucked into the housing 6 from the outside on the inverter circuit body 11 side flows into the motor unit 3, cools the motor unit 3, then flows into the compression mechanism unit 4 from the motor unit 3, and compresses the compression mechanism unit 4. And is discharged from the inside of the housing 6 to the outside as a high-temperature and high-pressure refrigerant.

  As shown in FIGS. 8A and 8B, in the electric compressor 1, the back surface side (housing 6) side of the IGBT 12 is in close contact with the bus bar 14 through the close contact means 27.

  The back side (housing 6) side of the bus bar 14 is in close contact with the inverter unit 2 via the insulating heat radiating sheet 7. Further, the back surface side (housing 6) side of the inverter unit 2 is in close contact with the housing 6 via the heat dissipation sheet 8.

  Thus, according to the electric compressor 1 using the inverter circuit body 11 according to the embodiment of the present invention, the IGBT 12 and the bus bar 14 can be assembled to the inverter circuit body 11 without using the base plate. In addition, a separate heat sink is not required. By reducing the number of components, the manufacturing cost can be reduced.

  Thus, the structure of the inverter circuit body 11 according to the embodiment of the present invention includes a plurality of IGBTs 12 constituting each arm of the inverter circuit, a control board on which a control circuit for controlling these IGBTs 12 is formed, The inverter circuit body 11 includes a bus bar electrode (bus bar) 14 that connects the control board and the IGBT 12, and the IGBT 12 is mounted on the bus bar 14, and heat is transmitted from the heat dissipation surface B (see FIG. 2) of the IGBT 12. The transmitted heat radiating part 16 was provided on the bus bar 14.

  In addition, the structure of the inverter circuit body 11 according to the embodiment of the present invention is such that the bus bar electrode (bus bar) 14 is connected to the bus bar main body portion 15 and the IGBT 12 and the heat radiating portion 16 to which the heat of the IGBT 12 is transmitted. The bus bar 14 is resin-molded with the output terminal portion 17 exposed to the outside.

  Further, in the structure of the inverter circuit body 11 according to the embodiment of the present invention, the rear surface side of the IGBT 12 is formed on the heat radiating plate 26, and the heat radiating plate 26 is connected to the heat radiating portion 16 of the bus bar 14 through the contact means 27.

  Further, the structure of the inverter circuit body 11 according to the embodiment of the present invention is such that the heat radiating portion 16 of the bus bar electrode (bus bar) 14 includes the negative side heat radiating portion 16a on which the negative side IGBT 12a constituting the negative side 25 arm is mounted. The plus side heat radiating portion 16b is formed so as to face the minus side heat radiating portion 16a in the plane direction A (see FIG. 3), and the plus side IGBT 12b constituting the plus side 24 arm is mounted.

  Furthermore, the electric compressor 1 according to the embodiment of the present invention includes an inverter unit 2 in which an inverter circuit body 11 is incorporated, a motor unit 3 whose driving is controlled by the inverter unit 2, and a rotational driving force of the motor unit 3. A compressor mechanism 4 for compressing the refrigerant and an inverter storage chamber 5 for storing the inverter 2 are provided, and a motor 6 and a housing 6 for storing the compression mechanism 4 are provided.

  According to the inverter circuit body 11 according to the embodiment of the present invention, the IGBT 12 is mounted on the bus bar 14 and the heat dissipating part for transferring heat from the heat dissipating surface of the IGBT 12 is provided on the bus bar 14, so that the base plate is not used. The IGBT 12 can be assembled.

  Moreover, since the heat radiating portion for transferring heat from the heat radiating surface of the IGBT 12 is provided on the bus bar 14, a separate heat radiating plate is not required. For this reason, the manufacturing cost can be reduced by reducing the number of components.

  Therefore, an inverter circuit body that does not require a base member and can be easily assembled can be provided.

  Further, according to the inverter circuit body 11 according to the embodiment of the present invention, the bus bar 14 is provided with the heat radiating portion 16 to which the heat of the IGBT 12 is transmitted, so that the heat generated in the IGBT 12 can be released and cooled. it can.

  Furthermore, according to the inverter circuit body 11 according to the embodiment of the present invention, the heat radiating plate 26 is connected to the heat radiating portion 16 of the bus bar 14 via the contact means 27. For this reason, IGBT12 and the bus-bar 14 can be closely_contact | adhered via the contact | adherence means 27, and the assembly | attachment of IGBT12 and the bus-bar 14 becomes easy.

  Further, according to the inverter circuit body 11 according to the embodiment of the present invention, the plus-side heat radiating portion 16b is formed so as to face the minus-side heat radiating portion 16a in the plane direction A (arrow A direction in FIG. 3). The structure of the bus bar 14 is substantially linear, and the manufacturing cost can be reduced by reducing the number of steps for managing the component parts.

  Furthermore, according to the electric compressor 1 according to the embodiment of the present invention, since the IGBT 12 is mounted on the bus bar 14 and the heat dissipating part for transferring heat from the heat dissipating surface of the IGBT 12 is provided on the bus bar 14, the base plate is not used. The IGBT 12 can be assembled.

  Moreover, since the heat radiating portion for transferring heat from the heat radiating surface of the IGBT 12 is provided on the bus bar 14, a separate heat radiating plate is not required. For this reason, the manufacturing cost can be reduced by reducing the number of components.

  Therefore, an electric compressor using an inverter circuit body that does not require a base member and can be easily assembled can be provided.

  As mentioned above, although the structure of the inverter circuit body of this invention and the electric compressor using the same were demonstrated based on embodiment of illustration, this invention is not limited to this, The structure of each part has the same function. It can be replaced with one having any configuration.

  For example, in the above-described embodiment of the present invention, the IGBT 12 has been described by illustrating the six IGBTs 12 including the plus side 24 and the minus side 25. However, in addition to the IGBT, a MOS, a transistor, a diode, or the like is used as a switching element. Can be adopted.

  Also, an IC module, a HIC, an IPM, or the like in which a plurality or all of the IGBTs 12 are packaged in a hybrid or monolithically integrated may be employed.

  The present invention relates to a structure of an inverter circuit body used in a vehicle and an electric compressor using the inverter circuit body, and provides an inverter circuit body structure that does not require a base member and can be easily assembled, and an electric compressor using the structure. Very useful.

DESCRIPTION OF SYMBOLS 1 Electric compressor 2 Inverter part 3 Motor part 4 Compression mechanism part 5 Inverter accommodating chamber 6 Housing 11 Inverter circuit body 12 Switching element (IGBT)
DESCRIPTION OF SYMBOLS 14 Bus bar 15 Bus bar main body 16 Heat radiation part 17 Output terminal part 18 Input terminal part 19 Switching element fixing | fixed part 21 Gate 22 Emitter 23 Collector 26 Heat sink 27 Contact | adhering means

Claims (5)

A plurality of switching elements (12) constituting each arm of the inverter circuit, a control board on which a control circuit for controlling these switching elements (12) is formed, and the control board and the switching elements (12) are connected. An inverter circuit body (11) comprising a bus bar electrode (14)
The switching element (12) is mounted on the bus bar electrode (14), and a heat radiating portion (16) through which heat is transmitted from the heat radiating surface of the switching element (14) is provided on the bus bar electrode (14). The structure of the characteristic inverter circuit body (11). The structure of the inverter circuit body (11) according to claim 1,
The bus bar electrode (14) is connected to the bus bar body (15) and the switching element (12), and the heat dissipating part (16) to which the heat of the switching element (12) is transmitted, 12) and an output terminal portion (17) for outputting electric power,
The structure of the inverter circuit body (11), wherein the bus bar electrode (14) is resin-molded with the output terminal portion (16) exposed to the outside. The structure of the inverter circuit body (11) according to claim 1 or 2,
A heat sink (26) is formed on the back side of the switching element (12),
The structure of the inverter circuit body (11), wherein the heat radiating plate (26) is connected to the heat radiating portion (16) of the bus bar electrode (14) through a close contact means (27). The structure of the inverter circuit body (11) according to any one of claims 1 to 3,
The heat dissipation part (16) of the bus bar electrode (14) includes a negative heat dissipation part (16a) on which a switching element (12a) constituting a negative arm is mounted, and the negative heat dissipation part (16a) in a planar direction. A structure of the inverter circuit body (11), characterized in that the inverter circuit body (11) is formed by a plus-side heat radiation portion (16b) on which a switching element (12b) that is formed so as to face each other and constitutes a plus-side arm is mounted.   An inverter unit (2) in which the inverter circuit body (11) according to any one of claims 1 to 4 is incorporated, and a motor unit (3) whose drive is controlled by the inverter unit (2), The motor unit (3) is provided with a compression mechanism unit (4) for compressing the refrigerant by the rotational driving force, and an inverter storage chamber (5) in which the inverter unit (2) is stored, and the motor unit (3 ) And a housing (6) in which the compression mechanism (4) is accommodated.

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