JP2016195478A - Inverter for electrically-driven compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inverter for an electrically-driven compressor capable of improving assemblability of a through-hole insertion type electronic component.SOLUTION: An inverter for an electrically-driven compressor includes: an aluminum base 50; an IPM 53 which has plate-like connection terminals 56 and 57 and which is thermally coupled to the aluminum base 50; and a substrate 51 which is fixed to the aluminum base 50 and in which the connection terminals 56 and 57 of the IPM 53 are inserted into through-holes 58 and 59. The connection terminals 56 and 57 are bent and formed in a thickness direction Y intersecting with a width direction X. The through-holes 58 and 59 in the substrate 51 are formed in a long-hole shape. The through-holes 58 and 59 having the long-hole shape extend in the thickness direction Y in the plate-like connection terminals 56 and 57 of the IPM 53.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an inverter for an electric compressor.

  As a configuration of an inverter that controls a motor built in a compressor, a technique is known in which a casing is attached to an outer shell of a housing, and a circuit board, a power control semiconductor element, and the like are accommodated in the casing (for example, Patent Document 1). ).

JP 2003-153552 A

  Incidentally, for example, as shown in FIGS. 8A and 8B, an IPM (Intelligent Power Module) 100 is used for the inverter for the electric compressor, and the connection terminals 102 and 103 are extended from the mold resin 101 and molded. The resin 101 is provided with through holes 104 and 105 for screwing.

Then, as shown in FIG. 9, after the IPM 100 is assembled to the base member 120 with screws 130 and 131, the substrate 110 is assembled and soldered.
The work of assembling the board 110 involves a large number of connection terminals 102 and 103 of the IPM 100 and the positional dimensional relationship of the connection terminals 102 and 103 varies within tolerances. When passing through 112, care is required. Furthermore, when assembly is performed by a robot rather than a person, there is a risk of frequent assembly errors.

  The objective of this invention is providing the inverter for electric compressors which can improve the assembly | attachment property of a through-hole insertion type electronic component.

  In the first aspect of the present invention, a base member, a plate-shaped connection terminal, a through hole insertion type electronic component that is thermally coupled to the base member, and the base member are fixed to the through hole. An electric compressor inverter comprising: a substrate into which a connection terminal of the through-hole insertion type electronic component is inserted, wherein the connection terminal is bent in a thickness direction orthogonal to the width direction, and the through hole in the substrate is The long hole-like through hole extends in the thickness direction of the plate-like connection terminal of the through-hole insertion type electronic component.

  According to the first aspect of the present invention, the through hole in the substrate has a long hole shape and extends in the thickness direction of the plate-like connection terminal of the through hole insertion type electronic component. As for the positional relationship between the connection terminal and the substrate, even if a positional shift occurs in the thickness direction of the plate-shaped connection terminal, the connection terminal bent in the thickness direction is absorbed by the variation in the positional relationship between the connection terminal and the through hole. The through hole insertion type electronic component can be easily assembled.

  As described in claim 2, in the inverter for an electric compressor according to claim 1, the plate-like connection terminal of the through-hole insertion type electronic component is narrower toward the tip in the width direction of the plate-like connection terminal. It is good to form so that it may become.

  According to the second aspect of the present invention, the plate-like connection terminal of the through-hole insertion type electronic component is formed in an oblique shape so that the tip becomes narrower in the width direction of the plate-like connection terminal. As for the positional relationship between the through-hole insertion type electronic component and the board, even if a positional deviation occurs in the width direction of the plate-like connection terminal, the variation in the positional relationship between the connection terminal and the through hole is absorbed to form the connection terminal on the board. Can be easily inserted into the through hole.

  According to a third aspect of the present invention, in the inverter for an electric compressor according to the first or second aspect, the elongated hole-shaped through hole may be formed in an oval shape, an elliptical shape, or a rectangular shape.

  ADVANTAGE OF THE INVENTION According to this invention, the assembly property of a through-hole insertion type electronic component can be improved.

The side view which fractures | ruptures and shows a part of electric compressor. The disassembled perspective view which shows the inverter for electric compressors. The disassembled perspective view which shows a part of inverter for electric compressors. (A) is a plan view of the IPM, (b) is a front view of the IPM, and (c) is a side view of the IPM. (A) is a plan view with the IPM assembled, (b) is a front view with the IPM assembled, and (c) is a side view with the IPM assembled. The circuit diagram which shows the electric constitution of the inverter for electric compressors. (A) is a partial top view of the board | substrate for demonstrating another example, (b) is a partial top view of the board | substrate for demonstrating another example. (A) is a plan view of an IPM for explaining the problem, and (b) is a side view of the IPM for explaining the problem. (A) is a plan view in a state where an IPM for explaining the problem is assembled, (b) is a front view in a state where the IPM for explaining the problem is assembled, and (c) is for explaining the problem. The side view in the state where IPM was assembled.

Hereinafter, an embodiment in which the present invention is embodied in an in-vehicle electric compressor inverter will be described with reference to the drawings.
As shown in FIG. 1, the electric compressor 10 has a housing 11. The housing 11 includes a bottomed cylindrical first housing 12 and a covered cylindrical second housing 13 provided in an opening of the first housing 12. The housing 11 is configured by connecting the first housing 12 and the second housing 13. The first housing 12 is provided with an inflow port 14 through which the refrigerant flows into the first housing 12 in the radial direction of the first housing 12. The first housing 12 accommodates a compression unit 15 that compresses the refrigerant and a motor 16 that drives the compression unit 15. An inverter 18 as an inverter for an electric compressor that drives the motor 16 is provided on the outer surface 17 in the axial direction of the first housing 12 (the end surface in the axial direction of the first housing 12). The inverter 18 is covered with a cover 19 provided on the outer surface 17 of the first housing 12.

The electrical configuration of the inverter 18 will be described with reference to FIG.
As shown in FIG. 6, the inverter (three-phase inverter) 18 includes an inverter circuit 20. The inverter circuit 20 includes six switching elements 21 to 26 and six diodes 27 to 32. IGBTs are used as the switching elements 21 to 26. Between positive electrode bus Lp and negative electrode bus Ln, switching element 21 constituting the U-phase upper arm and switching element 22 constituting the U-phase lower arm are connected in series. Between positive electrode bus Lp and negative electrode bus Ln, switching element 23 constituting the V-phase upper arm and switching element 24 constituting the V-phase lower arm are connected in series. Between the positive electrode bus Lp and the negative electrode bus Ln, a switching element 25 constituting the W-phase upper arm and a switching element 26 constituting the W-phase lower arm are connected in series. Diodes 27 to 32 are connected in reverse parallel to the switching elements 21 to 26. The in-vehicle battery 33 as a DC power source is connected to the positive electrode bus Lp and the negative electrode bus Ln. The output voltage of the in-vehicle battery 33 is 450V.

  The switching element 21 and the switching element 22 are connected to the U-phase terminal of the motor 16. Between the switching element 23 and the switching element 24 is connected to the V-phase terminal of the motor 16. The switching element 25 and the switching element 26 are connected to the W-phase terminal of the motor 16.

  A drive circuit 34 is connected to the gate terminals of the switching elements 21 to 26. The drive circuit 34 switches the switching elements 21 to 26 of the inverter circuit 20 based on a control signal from the controller 35. By the switching operation of the switching elements 21 to 26, the direct current supplied from the in-vehicle battery 33 is converted into a three-phase alternating current of an appropriate frequency and supplied to the windings of each phase of the motor 16 as a load. In other words, the windings of the respective phases of the three-phase AC motor 16 are energized by the switching operation of the switching elements 21 to 26 so that the three-phase AC motor 16 can be driven.

  Further, the inverter 18 includes an LC filter 36, a bleeder resistor 37, and a constant voltage generation circuit 38 on the direct current input side to the inverter circuit 20 on the buses Lp and Ln.

  The LC filter 36 includes a coil 39 inserted in the positive electrode bus Lp and a capacitor 40 connected between the positive electrode bus Lp and the negative electrode bus Ln. The LC filter 36 suppresses the inflow of ripple current from the vehicle side.

  A Zener diode 41 is connected in series to the bleeder resistor 37, and this series circuit is connected between the positive bus Lp and the negative bus Ln. In the Zener diode 41, the bleeder resistor 37 and the negative electrode bus Ln have a cathode on the bleeder resistor 37 side and an anode on the negative electrode bus Ln side.

  The constant voltage generation circuit 38 includes a transformer 42, a switching element 43, voltage dividing resistors 44 and 45, and a controller 46. The primary coil of the transformer 42 and the switching element 43 are connected in series, and this series circuit is connected between the positive electrode bus Lp and the negative electrode bus Ln. The primary side voltage of the transformer 42 is detected by the voltage dividing resistors 44 and 45 connected between the positive electrode bus Lp and the negative electrode bus Ln. The controller 46 performs switching operation of the switching element 43 while monitoring the primary side voltage of the transformer 42 by the voltage dividing resistors 44 and 45 and takes out 5V as the secondary side voltage of the transformer 42. This 5V voltage is used for driving the controller 35.

  As shown in FIGS. 2 and 3, the inverter 18 includes a flat aluminum base 50, a substrate (circuit substrate) 51, a coil 52, an IPM (Intelligent Power Module) 53, and a capacitor 54. The aluminum base 50 as a base member is formed by aluminum die casting. A coil 52, an IPM 53, four capacitors 54, a substrate 51, and the like are placed (fixed) on the aluminum base 50, and the substrate 51 and other components are electrically connected. The coil 52 in FIG. 3 corresponds to the coil 39 in FIG. The four capacitors 54 in FIG. 3 correspond to the capacitor 40 in FIG. The IPM 53 in FIG. 2 includes the inverter circuit 20 and the drive circuit 34 in FIG. 6, and these components are modularized.

The IPM 53 as a through-hole insertion type electronic component will be described with reference to FIGS. 4 (a), 4 (b), and 4 (c).
In the IPM 53, a chip constituting a switching element is mounted on a lead frame, and a part of the chip and the lead frame is sealed (molded) with a resin 55. More specifically, in FIG. 6, two switching elements for the upper, lower arms of U, V, and W are used in parallel, and a total of 12 elements are modularized. The resin 55 is rectangular in the plan view shown in FIG. 4A, has a long side and a short side, and has a predetermined thickness in the front view shown in FIG. As shown in FIG. 4A, screwing through holes 60 and 61 extending in the thickness direction are formed in the central portion of the short side of the resin 55. Then, the screw Sc1 (see FIG. 5) passing through the screwing through holes 60 and 61 is screwed into the aluminum base 50, whereby the IPM 53 is fixed to the aluminum base 50. Thereby, the IPM 53 is thermally coupled to the aluminum base 50.

  As shown in FIG. 4A, a large number of lead frame end portions project from the side surface of one of the pair of long sides of the mold resin 55 as connection terminals 56, and the mold resin 55 A large number of end portions of the lead frame project as connection terminals 57 from the side surface of the other long side of the pair of long sides. The connection terminals 56 and 57 are plate-like connection terminals. Thus, the IPM 53 as the through-hole insertion type electronic component has the plate-like connection terminals 56 and 57, and the connection terminal 56 and the connection terminal 57 protrude from the opposing side surfaces of the rectangular mold resin 55. The plate-like connection terminals 56 and 57 are bent in the thickness direction Y orthogonal to the width direction X. That is, the plate-like connection terminals 56 and 57 protrude in the horizontal direction from the side surface of the mold resin 55 and are bent approximately 90 degrees from the horizontal direction toward the upper side of the substrate 51. This is formed by bending the lead frame.

  As shown in FIG. 2, the substrate 51 is fixed to the aluminum base 50. A through hole 58 is formed in the substrate 51 at a position corresponding to the connection terminal 56 of the IPM 53, and a through hole 59 is formed at a position corresponding to the connection terminal 57 of the IPM 53. The connection terminal 56 of the IPM 53 is inserted into the through hole 58 of the substrate 51, and the connection terminal 57 of the IPM 53 is inserted into the through hole 59 of the substrate 51.

  As shown in FIG. 5, the through holes 58 and 59 in the substrate 51 have a long hole shape. Specifically, the elongated through holes 58 and 59 are oval (rounded rectangle). The long hole-like through holes 58 and 59 have a shape in which the length in the thickness direction Y is longer than the length in the width direction X of the plate-like connection terminals 56 and 57 of the IPM 53. That is, the long hole-like through holes 58 and 59 extend in the thickness direction Y of the plate-like connection terminals 56 and 57 of the IPM 53. Thus, the through holes 58 and 59 are elongated in the bending direction of the connection terminals (leads) 56 and 57.

  As shown in FIG. 4, the plate-like connection terminals 56 and 57 of the IPM 53 are notched into a triangle so that the center in the width direction X on the tip surface is a vertex, and has a slanted surface 62. That is, the plate-like connection terminals 56 and 57 are formed in an oblique shape so as to become narrower toward the tip in the width direction X. The taper processing of the tips (lead tips) of the connection terminals 56 and 57 is performed when the lead frame is punched.

  As shown in FIGS. 2 and 3, the aluminum base 50 has a plate shape as a whole. A component such as IPM 53 is placed on one surface of the aluminum base 50 in the thickness direction. Moreover, the surface on the opposite side to the surface where components, such as IPM53, are arrange | positioned among the surfaces of the thickness direction of the aluminum base 50 is the flat surface 63 (refer FIG.5 (b), (c)).

  As shown in FIG. 3, the coil 52 has two connection terminals (leads) 64 and 65. The coil 52 is arranged so that the extending direction of the connection terminals 64 and 65 faces the substrate 51 side. The coil 52 is covered with a case 66. The coil 52 is fixed to the aluminum base 50 by screwing a screw Sc2 penetrating through the attachment portions 66a and 66b provided in the coil case 66 into the aluminum base 50.

  As shown in FIG. 3, each capacitor 54 has two leads 54a. Each capacitor 54 is arranged such that the direction in which the lead 54a extends faces the substrate 51 side. The four capacitors 54 are covered with a case 67. The capacitor 54 is fixed to the aluminum base 50 by screwing a screw Sc3 penetrating the case 67 into the aluminum base 50. A concave portion 50 a that matches the outer shape of the capacitor 54 is formed at the position of the capacitor 54 in the aluminum base 50.

  As shown in FIG. 2, a cylindrical first screw, which is screwed with a screw Sc <b> 4 for fixing the substrate 51 to the aluminum base 50, is disposed on the periphery of the surface of the aluminum base 50 in the thickness direction, such as the substrate 51. One boss 68 is provided. A cylindrical second boss 69 is provided on the same surface as the surface on which the first boss 68 of the aluminum base 50 is provided. The first boss 68 and the second boss 69 are integrally formed with the aluminum base 50. As shown in FIG. 1, a screw Sc <b> 5 for fixing the aluminum base 50 to the housing 11 is inserted into the second boss 69.

  The inverter 18 is fixed to the housing 11 by screwing the screw Sc5 inserted through the cover 19 and the second boss 69 into the first housing 12. The aluminum base 50 has a flat surface 63 facing the outer surface 17 of the first housing 12. Accordingly, the flat surface 63 of the aluminum base 50 is in surface contact with the outer surface 17 of the housing 11.

  A coil 52, an IPM 53, a capacitor 54, and a substrate 51 are fixed to the aluminum base 50 with screws. The aluminum base 50 functions as a heat sink for these components and also functions as a fixing base for these components.

As shown in FIG. 1, a connector 70 is formed integrally with the cover 19, and pins 70 a of the connector 70 are connected to the substrate 51.
Next, the operation of the inverter 18 of this embodiment will be described.

  In the assembly procedure, the coil 52, the IPM 53, and the capacitor 54 are fixed to the aluminum base 50, and the substrate 51 is assembled. At this time, the connection terminals 56 and 57 of the IPM 53 are inserted into the through holes 58 and 59 of the substrate 51. Then, the cover 19 with the connector is attached, and then soldered together including the connection terminals 56 and 57 of the IPM 53. Thereafter, the cover 19 is attached to the housing 11.

  Here, the through holes 58 and 59 in the substrate 51 have a long hole shape, and the long hole through holes 58 and 59 extend in the thickness direction Y of the plate-like connection terminals 56 and 57 of the IPM 53. That is, the through holes of the substrate are generally circular, but in the present embodiment, the through holes 58 and 59 of the substrate 51 are elongated.

  Therefore, regarding the positional relationship between the IPM 53 and the substrate 51, there is a tolerance variation in the thickness direction Y of the plate-like connection terminals 56 and 57, and even if a positional deviation occurs, the tolerance variation is absorbed and bent in the thickness direction Y. The connected connection terminals 56 and 57 can be easily inserted into the through holes 58 and 59 of the substrate 51. Specifically, the through holes 58 and 59 of the substrate 51 have a long hole shape even if the connecting terminals 56 and 57 that are bent in the thickness direction Y do not have good bending accuracy. It is easy to insert the connection terminals 56 and 57 into.

  In general, when assembling the board, the number of connection terminals (leads) of the IPM is large, and the positional dimensional relationship of each connection terminal also varies within the tolerance. Therefore, when passing the connection terminal of the IPM through the through hole of the board, Care is required. Furthermore, when assembly is performed by a robot rather than a person, there is a risk of frequent assembly errors.

  In the present embodiment, in order to improve workability as much as possible, the through holes 58 and 59 of the substrate 51 are formed as long holes, and the positions of the connection terminals 56 and 57 vary in the thickness direction Y of the plate-like connection terminals 56 and 57. However, it is easy to pass through holes 58 and 59. That is, variations in the position dimension in the thickness direction Y of the plate-like connection terminals 56 and 57 of the IPM 53 can be absorbed by changing the shape of the through holes 58 and 59 of the substrate 51.

  Further, in the present embodiment, the tips of the connection terminals 56 and 57 of the IPM 53 are tapered, and the dispersion of the positional relationship in the width direction X of the plate-like connection terminals 56 and 57 is absorbed to connect the connection terminals 56 and 57 of the IPM 53. Through the through holes 58 and 59.

  In this way, even if displacement occurs in the width direction X and the thickness direction Y of the plate-like connection terminals 56 and 57 (even if there is a tolerance variation), the connection terminals 56 and 57 are connected to the through holes 58 and 59. Therefore, the assembling property of the IPM 53 can be improved.

  This leads to a reduction in caring work in the assembly process of the substrate 51 and the IPM 53. In addition, it is possible to prevent inconvenience of the product due to a robot assembly error in the automation line.

According to the above embodiment, the following effects can be obtained.
(1) As a configuration of the inverter 18 for the electric compressor, an IPM 53 as a through-hole insertion type electronic component having an aluminum base 50 and plate-like connection terminals 56 and 57 and thermally coupled to the aluminum base 50; And a substrate 51 that is fixed to the aluminum base 50 and into which the connection terminals 56 and 57 of the IPM 53 are inserted into the through holes 58 and 59. The connection terminals 56 and 57 are bent in the thickness direction Y orthogonal to the width direction X, the through holes 58 and 59 in the substrate 51 have a long hole shape, and the long hole through holes 58 and 59 have an IPM 53. The plate-like connection terminals 56 and 57 extend in the thickness direction Y.

  Therefore, regarding the positional relationship between the IPM 53 and the substrate 51, even if a positional deviation occurs in the thickness direction Y of the plate-like connection terminals 56 and 57, the positional relationship between the connection terminals 56 and 57 and the through holes 58 and 59 varies. The connection terminals 56 and 57 that are absorbed and bent in the thickness direction Y can be easily inserted into the through holes 58 and 59 of the substrate 51. Thereby, the assembling property of the IPM 53 as the through-hole insertion type electronic component can be improved.

  (2) The plate-like connection terminals 56 and 57 of the IPM 53 are formed in an oblique shape so that the tip ends in the width direction X of the plate-like connection terminals 56 and 57 become narrower. Therefore, regarding the positional relationship between the IPM 53 and the substrate 51, even if a positional deviation occurs in the width direction X of the plate-like connection terminals 56 and 57, the positional relationship between the connection terminals 56 and 57 and the through holes 58 and 59 varies. The connection terminals 56 and 57 can be easily inserted into the through holes 58 and 59 of the substrate 51 by absorbing.

(3) The oblong through holes 58 and 59 are practical because they are oval.
The embodiment is not limited to the above, and may be embodied as follows, for example.
Although applied to the IPM 53 as a through-hole insertion type electronic component having a plate-like connection terminal bent in the thickness direction, the present invention is not limited to this, and an IGBT, MOSFET, or other lead component such as a capacitor 54 may be used. In the case of an IGBT or MOSFET, it has three connection terminals (leads).

  The long hole-like through hole may be oval or rectangular instead of oval (rounded rectangle). That is, the through holes 58 and 59 of the substrate are oval (rounded rectangle), but instead of this, as shown in FIG. In addition, as shown in FIG. In short, the through hole only needs to have a long hole shape.

  -Although applied to an inverter for an on-vehicle electric compressor, it may be other than an on-vehicle electric compressor.

  18 ... Inverter for electric compressor, 50 ... Aluminum base, 51 ... Substrate, 53 ... IPM, 56, 57 ... Connection terminal, 58, 59 ... Through hole, X ... Width direction, Y ... Thickness direction.

Claims (3)

A base member;
A through-hole insertion type electronic component having a plate-like connection terminal and thermally coupled to the base member;
A substrate that is fixed to the base member and into which a connection terminal of the through-hole insertion type electronic component is inserted into a through-hole;
An inverter for an electric compressor comprising:
The connection terminal is bent in the thickness direction orthogonal to the width direction,
The through-hole in the substrate has a long hole shape, and the long hole-like through hole extends in the thickness direction of the plate-like connection terminal of the through-hole insertion type electronic component. Inverter.   The plate-like connection terminal of the through-hole insertion type electronic component is formed in an oblique shape so that the width becomes narrower toward the tip in the width direction of the plate-like connection terminal. Inverter for electric compressor.   The inverter for an electric compressor according to claim 1 or 2, wherein the long hole-shaped through hole has an elliptical shape, an elliptical shape, or a rectangular shape.