Power conversion device

Abstract

To provide a power conversion device capable of making improvement in a freedom degree of arrangement in a capacitor and a switch module compatible with suppression of increase of a physical constitution.SOLUTION: A power conversion device comprises a switch module 8, a capacitor 4, first bus bars 11 and 21, second bus bars 12 and 22, a resistance substrate 50, and fastening members 81 and 62. The capacitor is electrically connected to the switch module. The first bus bars are connected to the capacitor. The second bus bars are connected to the switch module. The resistance substrate is electrically connected to the first bus bars and discharges residual electric charge stored in the capacitor. The fastening members have conductivity and fasten the first bus bars, the second bus bars and discharge resistance. The resistance substrate is provided between the capacitor and the switch module.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The disclosure provided herein relates to a power conversion device. [Background technology]

[0002] Patent Document 1 describes a power conversion unit including a power module, a capacitor, a discharge resistance board, and a bus bar that electrically connects them. The configuration described is one in which the power module and the capacitor are aligned in the x direction. The configuration described is one in which the capacitor and the discharge resistance board are aligned in the z direction. The bus bar extends integrally while bending so as to be connected to the power module, the capacitor, and the discharge resistance board. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7124693 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration of Patent Document 1, the bus bar extends integrally while bending so as to be connected to the power module, the capacitor, and the discharge resistance board, so it is difficult to improve the degree of freedom in arranging the power module and the capacitor without complicating the shape of the bus bar. Also, the capacitor and the discharge resistance board are arranged in the z direction, so the physical size of the power conversion device in the z direction increases. It is difficult to simultaneously improve the degree of freedom in arranging the capacitor and the power module and suppress the increase in physical size.

[0005] An object of the present disclosure is to provide a power conversion device that can achieve both improved freedom in the arrangement of capacitors and switch modules and suppression of an increase in size. [Means for solving the problem]

[0006] A power conversion device according to one aspect of the present disclosure includes: a switch module (8) including a switch (7); a capacitor (4) electrically connected to the switch module; a first bus bar (11, 21) connected to the capacitor; a second bus bar (12, 22) connected to the switch module; a resistor board (50) electrically connected to the first bus bar and configured to discharge residual charge stored in the capacitor; a first bus bar, a second bus bar, and a conductive fastening member (81, 82) for fastening the resistance board together; A resistor substrate is disposed between the capacitor and the switch module.

[0007] Because the capacitor (4) and the switch module (8) are connected via the first bus bar (11, 21) and the second bus bar (12, 22), the shape of the first bus bar and the second bus bar are not complicated, and the degree of freedom in arranging the capacitor and the switch module can be improved. In addition, because the resistance board (50) is provided between the capacitor and the switch module, the increase in the physical size of the power conversion device in the direction in which the capacitor and the switch module are arranged can be suppressed. It is possible to achieve both an increase in the degree of freedom in arranging the capacitor and the switch module and a suppression of an increase in the physical size.

[0008] It should be noted that the reference numbers in parentheses above merely indicate the corresponding relationship with the configurations described in the embodiments described below, and do not in any way limit the technical scope. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is an electrical circuit diagram of the power conversion device. [Diagram 2] FIG. 2 is a cross-sectional view of a power conversion device. [Diagram 3] FIG. 2 is a plan view of the resistance substrate as viewed in the thickness direction. [Figure 4] 4 is a cross-sectional view taken along line IV-IV in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, several embodiments for carrying out the present disclosure will be described with reference to the drawings. In each embodiment, the same reference numerals may be used to designate parts corresponding to matters described in the preceding embodiment, and duplicated descriptions may be omitted. In each embodiment, when only a part of the configuration is described, the other embodiment described previously may be applied to the other parts of the configuration.

[0011] In addition to combinations of parts that are explicitly stated as possible in each embodiment, it is also possible to partially combine embodiments, embodiments and variations, and variations even if not explicitly stated, provided that there are no particular problems with the combination.

[0012] (First embodiment) 1 is an electrical circuit diagram of a power conversion device 1. The power conversion device 1 is mounted on a vehicle such as an electric vehicle or a hybrid vehicle. The power conversion device 1 performs power conversion between a battery 2 and a motor generator 3. The power conversion device 1, together with the battery 2 and the motor generator 3, constitutes a drive system for the vehicle.

[0013] The battery 2 is a chargeable and dischargeable secondary battery such as a lithium ion battery or a nickel metal hydride battery. The motor generator 3 is a three-phase AC rotating electric machine. The motor generator 3 may be called a multi-phase motor. The motor generator 3 functions as a drive source for the vehicle, that is, an electric motor. The motor generator 3 functions as a generator during regeneration.

[0014] The power conversion device 1 includes a capacitor 4, a power conversion unit 5, a P-side bus bar 10, an N-side bus bar 20, an output bus bar 30, a drive board 40, a resistance board 50, a control board 60, and fastening members 81 and 82. The capacitor 4 smoothes the DC current supplied from the battery 2. The positive electrode of the capacitor 4 is connected to the positive electrode, which is the electrode on the high potential side of the battery 2. The negative electrode of the capacitor 4 is connected to the negative electrode, which is the electrode on the low potential side of the battery 2.

[0015] The power conversion unit 5 is a DC-AC conversion unit that converts the supplied DC power into three-phase AC of a predetermined frequency. The power conversion unit 5 outputs the power converted from DC power to AC power to the motor generator 3. The power conversion unit 5 also converts the AC power generated by the motor generator 3 into DC power.

[0016] The power conversion unit 5 includes upper and lower arm circuits 6. The upper and lower arm circuits 6 are sometimes referred to as legs. The upper and lower arm circuits 6 for each phase are configured by connecting an upper arm 6H and a lower arm 6L in series between a P-side bus bar 10, which is a power supply line on the positive side, and an N-side bus bar 20, which is a power supply line on the negative side.

[0017] As an example, the power conversion unit 5 includes a three-phase upper and lower arm circuit 6. The three-phase upper and lower arm circuit 6 includes a U-phase upper and lower arm circuit, a V-phase upper and lower arm circuit, and a W-phase upper and lower arm circuit. The three-phase upper and lower arm circuits 6 are individually covered with a resin member to form a switch module 8. The three-phase switch module 8 may be collectively referred to as a power module.

[0018] In this embodiment, as an example of the switching elements constituting each of the arms 6H and 6L, n-channel insulated gate bipolar transistors (hereinafter referred to as switches 7) are used. A freewheeling diode FWD7D is connected in inverse parallel to each of the switches 7. Each upper and lower arm circuit 6 for one phase has two switches 7.

[0019] In the upper arm 6H, a first input terminal 7A is connected to the collector of the switch 7. The P-side bus bar 10 and the collector of the switch 7 are electrically connected via the first input terminal 7A. In the lower arm 6L, a second input terminal 7B is connected to the emitter of the switch 7. The N-side bus bar 20 and the emitter of the switch 7 are electrically connected via the second input terminal 7B. An output terminal 7C is connected to the midpoint between the upper arm 6H and the lower arm 6L. The output terminal 7C and the motor generator 3 are electrically connected via the output bus bar 30.

[0020] Further, a gate terminal 7E is connected to the gate of the switch 7 in the upper arm 6H. A gate terminal 7E is connected to the gate of the switch 7 in the lower arm 6L. The gate terminal 7E connected to the switch 7 in the upper arm 6H and the gate terminal 7E connected to the switch 7 in the lower arm 6L are electrically connected to a drive substrate 40. The drive substrate 40 has a drive control circuit that controls the on / off of the switch 7, and a drive circuit that drives the switch 7.

[0021] The P-side bus bar 10 includes a first P-side bus bar 11 and a second P-side bus bar 12. The first P-side bus bar 11 is a bus bar connected to the positive electrode of the capacitor 4. The second P-side bus bar 12 is a bus bar connected to the first input terminal 7A of the switch module 8. The first P-side bus bar 11 and the second P-side bus bar 12 are electrically and mechanically connected via a first fastening member 81. The first fastening member 81 is a conductive fastening member.

[0022] The N-side bus bar 20 includes a first N-side bus bar 21 and a second N-side bus bar 22. The first N-side bus bar 21 is a bus bar connected to the negative electrode of the capacitor 4. The second N-side bus bar 22 is a bus bar connected to the second input terminal 7B of the switch module 8. The first N-side bus bar 21 and the second N-side bus bar 22 are electrically and mechanically connected via a second fastening member 82. The second fastening member 82 is a conductive fastening member.

[0023] The drive board 40 has a drive circuit, a drive control circuit, and a base material 41 on which these are mounted. The drive board 40 controls the on / off of the switch 7 via the gate terminal 7E. For this reason, the power conversion device 1 can supply three-phase AC currents with different periods to the motor generator 3 via the output bus bar 30. The drive circuit supplies a drive voltage to the gate of the switch 7 of the corresponding arm based on a drive command from the drive control circuit. The drive circuit drives the corresponding switch 7, i.e., drives it on and off, by applying the drive voltage. The drive circuit is sometimes referred to as a driver.

[0024] The resistance board 50 is a board on which a processing resistor for discharging residual charges accumulated in the capacitor 4 is mounted. In order to prevent accidental electric shock to an operator or driver when the power supply is cut off in the event of a collision or the like, the power conversion device 1 causes the charge accumulated in the capacitor 4 to be rapidly discharged to the resistance board 50. The resistance board 50 has a plurality of resistors 51 as processing resistors and a base material 52 on which the plurality of resistors 51 are mounted. The resistor 51 has a resistive element 51A and two resistive terminals 51B and 51C. As an example, a cement resistor is used as the resistor 51. A cement resistor is a resistor in which a wire-wound resistor or the like is placed in a ceramic case or the like and sealed with cement. A cement resistor has an advantage of being excellent in heat resistance. The type of resistor 51 is not limited to a cement resistor.

[0025] Resistor terminal 51B is a terminal electrically connected to P-side bus bar 10. Resistor terminal 51C is a terminal electrically connected to N-side bus bar 20. Base material 52 is electrically and mechanically fastened to first fastening member 81 and second fastening member 82. First bus bars 11, 21, second bus bars 12, 22, and base material 52 are electrically and mechanically fastened by fastening members 81, 82. In addition, wiring pattern 53 is printed on base material 52. Resistor terminals 51B, 51C are electrically connected to fastening members 81, 82 by wiring pattern 53. Resistor terminals 51B, 51C are electrically connected to fastening members 81, 82 via wiring pattern 53, fastening members 81, 82, and first bus bars 11, 21. Resistor 51 is electrically connected to capacitor 4 via wiring pattern 53, fastening members 81, 82, and first bus bars 11, 21.

[0026] It should be noted that first busbars 11, 21 are a collective term for first P-side busbar 11 and first N-side busbar 21. Second busbars 12, 22 are a collective term for second P-side busbar 12 and second N-side busbar 22. Fastening members 81, 82 are a collective term for first fastening member 81 and second fastening member 82.

[0027] The control board 60 has a switch 61 connected to the resistor 51, a control circuit 62 that controls the switch 61 so that the residual charge of the capacitor 4 is discharged to the resistor 51 upon collision, and a base material 63 on which these are mounted. The control circuit 62 is electrically connected to the drive board 40 via a wire harness (not shown) or the like. The switch 61 is electrically connected to the resistor 51 via a wire harness (not shown) or the like. The switch 61 is connected in series between the resistor 51 and the second N-side bus bar 22. Note that the switch 61 is not limited to being mounted on the control board 60. The switch 61 may be mounted on the base material 52 of the resistor board 50, for example. Note that in order to distinguish between the switch 7 and the switch 61, the switch 7 may be referred to as a first switch. The switch 61 may be referred to as a second switch.

[0028] An on / off signal is given to the switch 61 from, for example, a control circuit 62. If the switch 61 is of a normally-off type, then, for example, an on signal is given to the switch 61 from the control circuit 62 at the time of a collision. An off signal is given to the switch 61 from the control circuit 62 at times other than when a collision occurs. When an on signal is given to the switch 61 at the time of a collision, the switch 61 turns on and the two electrodes of the capacitor 4 are connected via the resistor 51. Therefore, the charge from the capacitor 4 is discharged to the resistor 51 through the switch 61. The voltage between the electrodes of the capacitor 4 decreases over time.

[0029] Note that the switch 61 may be of a normally-on type. In this case, the control circuit 62 performs control corresponding to the normally-on type, so that the switch 61 is turned on at the time of a collision and the two electrodes of the capacitor 4 are connected via the resistor 51. As another example, the control circuit 62 does not need to provide an off signal to the switch 61. The drive of the switch 61 may be controlled so that the switch 61 is off when there is no signal from the control circuit 62 and is on when there is a signal from the control circuit. Alternatively, the reverse may be true.

[0030] <Mechanical configuration of the power conversion device> Next, the mechanical configuration of the power converter 1 will be described. FIG. 2 is a cross-sectional view of the power converter 1. FIG. 3 is a plan view of the resistance board 50 as viewed from the plate thickness direction TD. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3. The substrate 52 of the resistance board 50 has a flat plate shape in the plate thickness direction TD. The two directions perpendicular to the plate thickness direction TD may be referred to as the width direction WD and the depth direction DP. The plate thickness direction TD, the width direction WD, and the depth direction DP are three directions perpendicular to each other. The depth direction DP is a direction perpendicular to the plate thickness direction TD and the width direction WD, and may be referred to as the orthogonal direction. The power converter 1 has a case 90 in addition to the components described so far. The substrate 41 of the drive substrate 40 and the substrate 43 of the control substrate 60 also have a flat plate shape in the plate thickness direction TD.

[0031] The case 90 has an annular wall 91 extending annularly in the circumferential direction around the plate thickness direction TD, and a partition wall 92 connected to the inner wall of the annular wall 91 and dividing the internal space into two in the plate thickness direction TD. The annular wall 91 has two wall portions separated in the width direction WD and two wall portions separated in the depth direction DP. The two wall portions separated in the width direction WD may be referred to as a first wall portion 91A and a second wall portion 91B. The control board 60 is housed in a space 93 below the partition wall 92 in the internal space. Components other than the control board 60 are housed in a space 94 above the partition wall 92 in the internal space.

[0032] In the space 94, the switch module 8, the resistance board 50, and the capacitor 4 are arranged in this order from the first wall portion 91A to the second wall portion 91B. The width direction WD corresponds to the arrangement direction of the switch module 8 and the capacitor 4. The switch module 8 and the capacitor 4 are arranged apart in the width direction WD. The resistance board 50 is provided in the space 95 between the switch module 8 and the capacitor 4.

[0033] The first P-side bus bar 11 and the first N-side bus bar 21 are connected to the capacitor 4. The first P-side bus bar 11 is connected to the positive electrode. The first N-side bus bar 21 is connected to the negative electrode. Note that the first P-side bus bar 11 is shown in FIG. 2 as a representative of the first P-side bus bar 11 and the first N-side bus bar 21. The first N-side bus bar 21 is provided so as to overlap the first P-side bus bar 11 in the depth direction DP. The first P-side bus bar 11 and the first N-side bus bar 21 extend from the capacitor 4 toward the switch module 8.

[0034] The second P-side bus bar 12 and the second N-side bus bar 22 are connected to the switch module 8. The second P-side bus bar 12 is connected to the first input terminal 7A. The second N-side bus bar 22 is connected to the second input terminal 7B. Note that the second P-side bus bar 12 is shown in FIG. 2 as a representative of the second P-side bus bar 12 and the second N-side bus bar 22. The second N-side bus bar 22 is provided so as to overlap the second P-side bus bar 12 in the depth direction DP. The second P-side bus bar 12 and the second N-side bus bar 22 extend from the switch module 8 toward the capacitor 4.

[0035] The first P-side bus bar 11 and the second P-side bus bar 12 are fastened by a first fastening member 81. The first N-side bus bar 21 and the second N-side bus bar 22 are fastened by a second fastening member 82. The fastening members 81, 82 extend in the plate thickness direction TD. As an example, the fastening members 81, 82 have two bolts 83, 84. The two bolts 83, 84 have heads 83A, 84A and shafts 83B, 84B. The two bolts 83, 84 are aligned in the plate thickness direction TD.

[0036] Of the two bolts 83, 84, the one disposed at the lower side may be referred to as the lower bolt 83. Of the two bolts 83, 84, the one disposed at the upper side may be referred to as the upper bolt 84. A hole through which the shaft portion 83B of the upper bolt 84 is passed is formed in the head 83A of the lower bolt 83. The shaft portion 83B is passed through the hole in the head 83A, and the lower bolt 83 and the upper bolt 84 are screwed together to form the fastening members 81, 82. Note that the fastening members 81, 82 are not limited to this form.

[0037] The switch module 8 and the capacitor 4 have a length in the plate thickness direction TD. As an example, the size of the capacitor 4 in the plate thickness direction TD is larger than the size of the switch module 8 in the plate thickness direction TD. An upper surface 4A of the capacitor 4 is farther away from the partition wall 92 in the plate thickness direction TD than an upper surface 8A of the switch module 8. As an example, the length of the fastening members 81, 82 in the plate thickness direction TD is approximately the same as the length of the capacitor 4 in the plate thickness direction TD.

[0038] The first P-side bus bar 11 and the second P-side bus bar 12 are fastened to the first fastening member 81 near the partition wall 92 of the first fastening member 81. It can also be said that the first P-side bus bar 11 and the second P-side bus bar 12 are fastened to the shaft portion 83B of the first fastening member 81 near the partition wall 92. The first N-side bus bar 21 and the second N-side bus bar 22 are fastened to the second fastening member 82 near the partition wall 92 of the second fastening member 82. It can also be said that the first N-side bus bar 21 and the second N-side bus bar 22 are fastened to the second fastening member 82 near the partition wall 92 of the shaft portion 83B of the second fastening member 82.

[0039] The fastening points between first P-side busbar 11 and second P-side busbar 12 and first fastening member 81 may be referred to as P-side busbar fastening points. The fastening points between first N-side busbar 21 and second N-side busbar 22 and second fastening member 82 may be referred to as N-side busbar fastening points. The P-side busbar fastening points and N-side busbar fastening points may be collectively referred to as first fastening points P1.

[0040] The base material 52 is fastened to the fastening members 81, 82 at a position farther away from the partition wall 92 in the plate thickness direction TD than the first fastening point P1 of the fastening members 81, 82. It can also be said that the base material 52 is fastened at a position at the shaft portion 84B of the fastening members 81, 82 farther away from the partition wall 92 in the plate thickness direction TD. The fastening point between the base material 52 and the fastening members 81, 82 may be referred to as the second fastening point P2. The second fastening point P2 is farther away from the partition wall 92 in the plate thickness direction TD than the first fastening point P1. The second fastening point P2 is located higher than the first fastening point P1. The base material 52 also overlaps the bus bars 10, 20 in the plate thickness direction TD. More specifically, the base material 52 overlaps the first bus bars 11, 21 more in the plate thickness direction TD than the second bus bars 12, 22.

[0041] The substrate 52 has a front surface 52A and a back surface 52B aligned in the plate thickness direction TD. The back surface 52B overlaps the partition wall 92 in the plate thickness direction TD. A plurality of resistors 51 are mounted on the back surface 52B. The plurality of resistors 51 are provided between a first fastening point P1 and a second fastening point P2 in the plate thickness direction TD. The plurality of resistors 51 are also arranged aligned in the depth direction DP. Resistor terminals 51B, 51C of the resistor 51 are passed through the substrate 52. The resistor terminals 51B, 51C are electrically connected to a wiring pattern 53 printed on the substrate 52. The wiring pattern 53 is further electrically connected to fastening members 81, 82.

[0042] Furthermore, the resistance substrate 50 overlaps the capacitor 4 in the width direction WD. More specifically, the resistance substrate 50 is provided between the upper surface 8A of the switch module 8 and the upper surface 4A of the capacitor 4 in the plate thickness direction TD. The arrangement of the resistance substrate 50 is not limited to this. The resistance substrate 50 may overlap the switch module 8 in the width direction WD. The resistance substrate 50 may overlap both the capacitor 4 and the switch module 8 in the width direction WD.

[0043] The drive board 40 is provided on the upper surface 8A of the switch module 8 so as to overlap in the plate thickness direction TD. The drive board 40, the resistance board 50, and the control board 60 are individually separated and separate bodies. The control board 60 is provided in a space 93. The drive board 40 and the resistance board 50 are provided in a space 94. As an example, a hole (not shown) is formed in the partition wall 92. The drive board 40 and the control board 60 are electrically connected via the hole by a wire harness (not shown) or the like. The resistance board 50 and the control board 60 are electrically connected via the hole by a wire harness (not shown) or the like.

[0044] <Action and effect> The power conversion device 1 has a switch module 8, a capacitor 4, first bus bars 11, 21, second bus bars 12, 22, a resistor board 50, and fastening members 81, 82. The first bus bars 11, 21 are connected to the capacitor 4. The second bus bars 12, 22 are connected to the power module. The resistor board 50 is electrically connected to the first bus bars 11, 21. The resistor board 50 discharges residual charges accumulated in the capacitor 4 via the first bus bars 11, 21. The fastening members 81, 82 fasten the first bus bars 11, 21, the second bus bars 12, 22, and the resistor board 50 together. The resistor board 50 is provided between the capacitor 4 and the switch module 8.

[0045] When the first busbars 11, 21 and the second busbars 12, 22 are integrated, the shapes of the busbars 10, 20 may become complicated due to the arrangement of the capacitors 4 and the switch modules 8. When the shapes of the busbars 10, 20 become complicated, it becomes difficult to perform multiple processes simultaneously in parallel. It becomes difficult to shorten the manufacturing period and reduce costs. Furthermore, when the shapes of the busbars 10, 20 become complicated, the wiring length of the busbars 10, 20 increases, and there is a risk that the inductance component of the busbars 10, 20 increases.

[0046] In this embodiment, the capacitor 4 and the switch module 8 are connected via the first bus bars 11, 21 and the second bus bars 12, 22, so the shapes of the bus bars 10, 20 do not become complicated. This makes it easy to perform a plurality of processes simultaneously in parallel. Furthermore, the inductance components of the bus bars 10, 20 do not increase. This improves the degree of freedom in arranging the capacitor 4 and the switch module 8.

[0047] In this embodiment, the capacitor 4 and the switch module 8 are arranged at a distance from each other. A space 95 is provided between the capacitor 4 and the switch module 8 to pass the bus bars 10, 20 therethrough. A resistance board 50 is provided in the space 95. In this embodiment, the space 95 is utilized as a space for arranging the resistance board 50, without being a dead space in which components other than the bus bars 10, 20 cannot be arranged. An increase in the size of the power conversion device 1 can be suppressed in the direction in which the capacitor 4 and the switch module 8 are arranged. This makes it possible to improve the freedom of arrangement of the capacitor 4 and the switch module 8 while suppressing an increase in the size of the power conversion device 1.

[0048] The resistor board 50 has a resistor 51 and a substrate 52. The resistor 51 is mounted on the substrate 52. The substrate 52 is fastened to fastening members 81, 82. The fastening members 81, 82 extend in the plate thickness direction TD. A first fastening point P1 and a second fastening point P2 are spaced apart in the plate thickness direction TD. The resistor 51 is provided between the first fastening point P1 and the second fastening point P2 in the plate thickness direction TD.

[0049] According to this, radiant heat from P-side busbar 10 and N-side busbar 20 is transferred to resistor 51 before substrate 52. This suppresses the radiant heat being transferred to substrate 52. Warping of substrate 52 due to radiant heat is suppressed. Poor connection between resistor 51 and substrate 52 is suppressed. Electrical connection between capacitor 4 and resistor 51 is easily secured. Furthermore, an increase in the size of power conversion device 1 in the plate thickness direction TD is suppressed.

[0050] The power conversion device 1 has a drive substrate 40 that drives the switch module 8. The drive substrate 40 and the resistor substrate 50 are separate bodies. Because the drive substrate 40 and the resistor substrate 50 are separate bodies, vibration is less likely to be transmitted to the resistor substrate 50 compared to when the drive substrate 40 and the resistor substrate 50 are integrated. This prevents poor connection between the resistor 51 and the substrate 52. Electrical connection between the capacitor 4 and the resistor 51 is easily ensured.

[0051] The power conversion device 1 has a plurality of resistors 51. The plurality of resistors 51 are aligned in the depth direction DP and connected in parallel to one another. This makes it possible to accommodate various variations in accordance with the specifications of the capacitor 4 and voltage. Even if the number of resistors 51 increases, the size of the power conversion device 1 can be prevented from increasing.

[0052] The substrate 52 overlaps with the capacitor 4 in the width direction WD. This prevents the substrate 52 from being disposed above the upper surface 4A of the capacitor 4. An increase in the size of the power conversion device 1 in the plate thickness direction TD is prevented.

[0053] The power conversion device 1 is mounted on a vehicle. The power conversion device 1 has a control board 60 having a switch 61 and a control circuit 62. The switch 61 is connected to a resistor 51. The control circuit 62 controls the switch 61 so that the residual charge in the capacitor 4 is discharged to the resistor 51 when the vehicle is shocked. This prevents accidental electric shock to an operator or a driver.

[0054] Although the present disclosure has been described based on the embodiment, it is understood that the present disclosure is not limited to the embodiment or structure. The present disclosure also includes various modifications and modifications within the equivalent range. In addition, although various combinations and forms are shown in the present disclosure, other combinations and forms including only one element, more than one, or less than one element are also within the scope and concept of the present disclosure. [Explanation of symbols]

[0055] 11, 21 first bus bar; 12, 22 second bus bar; 4 capacitor; 40 drive board; 50 resistor board; 51 resistor; 52 substrate; 60 control board; 61 second switch; 62 control circuit; 7 first switch; 8 switch module; 81, 82 fastening member; DP orthogonal direction; P1 first fastening point; P2 second fastening point; TD plate thickness direction; WD arrangement direction

Claims

1. a switch module (8) including a switch (7); a capacitor (4) electrically connected to the switch module; A first bus bar (11, 21) connected to the capacitor; a second bus bar (12, 22) connected to the switch module; a resistive substrate (50) electrically connected to the first bus bar and configured to discharge residual charges stored in the capacitor; a conductive fastening member (81, 82) that fastens the first bus bar, the second bus bar, and the resistance board; The power conversion device, wherein the resistor substrate is provided between the capacitor and the switch module.

2. The resistor board includes a resistor (51) and a base material (52) on which the resistor is mounted and to which the fastening member is fastened; The fastening member extends in a thickness direction (TD) of the base material, a first fastening point (P1) between the first bus bar and the second bus bar and the fastening member, and a second fastening point (P2) between the base material and the fastening member are spaced apart in the plate thickness direction; The power conversion device according to claim 1 , wherein the resistor is provided between the first fastening point and the second fastening point in the plate thickness direction.

3. A drive board (40) for driving the switch module is further provided. The power conversion device according to claim 2 , wherein the drive board and the resistance board are separate bodies.

4. A plurality of the resistors are provided, A plurality of the resistors are aligned in a direction perpendicular to both a direction (WD) in which the switch modules and the capacitors are aligned and a direction (DP) perpendicular to the plate thickness direction; The power conversion device according to claim 3 , wherein a plurality of the resistors are connected in parallel.

5. The power conversion device according to claim 4 , wherein the base material overlaps with the capacitor or the switch module in the arrangement direction, or overlaps with the capacitor and the switch module in the arrangement direction.

6. A power conversion device mounted on a vehicle, The power conversion device according to any one of claims 2 to 5, further comprising a control board (60) having a second switch (61) different from the first switch, which is the switch, and connected to the resistor, and a control circuit (62) for controlling the second switch so that the residual charge of the capacitor is discharged to the resistor when an impact is applied to the vehicle.

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