On-vehicle electric compressor control substrate, on-vehicle electric compressor provided with the same, and manufacturing method for on-vehicle electric compressor control substrate

Abstract

To provide an on-vehicle electric compressor control substrate in which an increase in electromagnetic noise when a capacitor element is not connected between a power source wire and a grounded wire can be restrained or canceled.SOLUTION: An on-vehicle electric compressor control substrate includes: a separate pattern 43 having a power source pad 46, a ground pad 47, and a GND pad 48 and being separated from a power source wire 27, a GND wire 28, and a ground wire 37; a power source-side pad 51 disposed on the power source wire 27; a ground-side pad 52 disposed on the ground wire 37; and a GND-side pad 53 disposed on the GND wire 28. The power source pad 46 can be connected to the power source-side pad 51 via a solder 61. The GND pad 48 can be connected to the GND-side pad 53 via the solder 61. The ground pad 47 can be connected to the ground-side pad 52 via a capacitor element 38A.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a control board for an on-board electric compressor for controlling an on-board electric compressor mounted on a vehicle, an on-board electric compressor including the control board, and a method for manufacturing the control board for an on-board electric compressor. [Background technology]

[0002] In a vehicle air conditioner for conditioning the interior of an electric vehicle, an on-board electric compressor equipped with a motor is used instead of an engine-driven compressor. In this case, an inverter circuit consisting of multiple switching elements converts a DC voltage from a high-voltage battery (e.g., about DC 300 V) (on-board battery) into an AC voltage and applies it to the motor.

[0003] The switching elements of the inverter circuit are switched by a control device, and in this case, the power supply wiring connected to the positive electrode of the battery, the GND wiring connected to the negative electrode of the battery, the ground wiring, the control device, etc. are arranged on a control board and attached to the housing of the vehicle-mounted electric compressor. The GND wiring is provided over a wide area of ​​the control board, and the ground wiring is provided around the fixing holes used to fix the control board to the housing with bolts, and the ground wiring is conducted to the housing when the bolts are inserted through the fixing holes to fix the control board.

[0004] In addition, multiple capacitor elements (Y capacitors) consisting of a single or multiple capacitors (capacitor groups) are connected between the power supply wiring and the ground wiring to return the common mode current flowing out from the inverter circuit etc. to the noise source (noise recovery), thereby improving EMI (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6571358 Summary of the Invention [Problem to be solved by the invention]

[0006] Capacitor elements like those described above are known as Y capacitors, and in actual development, electromagnetic noise testing (EMC testing) is conducted to determine whether or not to include the multiple capacitor elements (Y capacitors) scattered across the control board in order to optimize the design.

[0007] However, if a capacitor element is not mounted on the capacitor connection pattern on the substrate for connecting the power supply wiring and the ground wiring, the coupling of the electric field lines between the capacitor connection pattern extending from the power supply wiring and the GND wiring becomes weak, causing the capacitor connection pattern to act as an antenna, increasing electromagnetic noise.

[0008] The present invention has been made to solve the above-mentioned conventional technical problems, and has an object to provide a control board for an on-board electric compressor that can suppress or eliminate the increase in electromagnetic noise that occurs when a capacitor element is not connected between a power supply wiring and a ground wiring, an on-board electric compressor including the control board, and a method for manufacturing the control board for an on-board electric compressor. [Means for solving the problem]

[0009] The control board for an on-board electric compressor of the present invention comprises a power supply wiring conducted to the positive electrode of a battery mounted on a vehicle, a GND wiring conducted to the negative electrode of the battery, a fixing hole to a housing of the on-board electric compressor, and a ground wiring provided in the fixing hole and conducted to the housing, and a capacitor element consisting of a single or multiple capacitors can be connected between the power supply wiring and the ground wiring, and is characterized in that it has a power supply pad, a ground pad, and a GND pad, and comprises a separation pattern separated from the power supply wiring, the GND wiring, and the ground wiring, a power supply side pad provided on the power supply wiring, a ground side pad provided on the ground wiring, and a GND side pad provided on the GND wiring, the power supply pad can be connected to the power supply side pad by a conductor, the GND pad can be connected to the GND side pad by a conductor, and the ground pad can be connected to the ground side pad via a capacitor element.

[0010] The control board for an in-vehicle electric compressor of the invention of claim 2 is characterized in that, in the above invention, the GND pad is not connected to the GND side pad, the power supply pad is connected to the power supply side pad by a conductor, and a capacitor element is connected between the ground pad and the ground side pad.

[0011] The control board for an in-vehicle electric compressor of the invention of claim 3 is characterized in that, in the invention of claim 1, the power supply pad is not connected to the power supply side pad, and a capacitor element is not connected between the ground pad and the ground side pad, and the GND pad is connected to the GND side pad by a conductor.

[0012] The control board for an in-vehicle electric compressor of the invention of claim 4 is characterized in that, in the invention of claim 1, the power supply pad is not connected to the power supply side pad, and the GND pad is not connected to the GND side pad, but the ground pad is connected to the ground side pad by a conductor.

[0013] The in-vehicle electric compressor of the invention of claim 5 is characterized in that the control board for the in-vehicle electric compressor of each of the above inventions is fixed to a housing by a bolt inserted into a fixing hole, and in that state, a ground wiring is conducted to the housing via the bolt.

[0014] The manufacturing method of a control board for an on-vehicle electric compressor of the invention of claim 6 is characterized in that, in manufacturing a control board for an on-vehicle electric compressor having a power supply wiring conducted to a positive electrode of a battery mounted on a vehicle, a GND wiring conducted to the negative electrode of the battery, a fixing hole to a housing of the on-vehicle electric compressor, and a ground wiring provided in the fixing hole and conducted to the housing, the control board has a power supply pad, a ground pad, and a GND pad, and constitutes a separated pattern separated from the power supply wiring, the GND wiring, and the ground wiring, a power supply side pad is provided on the power supply wiring, a ground side pad is provided on the ground wiring, and a GND side pad is provided on the GND wiring, and when a capacitor element consisting of a single or multiple capacitors is connected between the power supply wiring and the ground wiring, the GND pad is not connected to the GND side pad, and the power supply pad is connected to the power supply side pad by a conductor, and a capacitor element is connected between the ground pad and the ground side pad, and when the capacitor element is not connected, the power supply pad is not connected to the power supply side pad, and the GND pad is connected to the GND side pad by a conductor without connecting a capacitor element between the ground pad and the ground side pad.

[0015] The manufacturing method of a control board for an on-board electric compressor of the invention of claim 7 is characterized in that, in manufacturing a control board for an on-board electric compressor having a power supply wiring conducted to a positive electrode of a battery mounted on a vehicle, a GND wiring conducted to the negative electrode of the battery, a fixing hole to a housing of the on-board electric compressor, and a ground wiring provided in the fixing hole and conducted to the housing, the control board has a power supply pad, a ground pad, and a GND pad, and constitutes a separated pattern separated from the power supply wiring, the GND wiring, and the ground wiring, a power supply side pad is provided on the power supply wiring, a ground side pad is provided on the ground wiring, and a GND side pad is provided on the GND wiring, and when a capacitor element consisting of a single or multiple capacitors is connected between the power supply wiring and the ground wiring, the GND pad is not connected to the GND side pad, and the power supply pad is connected to the power supply side pad by a conductor, and a capacitor element is connected between the ground pad and the ground side pad, and when the capacitor element is not connected, the power supply pad is not connected to the power supply side pad, and the GND pad is not connected to the GND side pad, and the ground pad is connected to the ground side pad by a conductor. Effect of the Invention

[0016] According to the present invention, a control board for an on-board electric compressor includes a power supply wiring conducted to a positive electrode of a battery mounted on a vehicle, a GND wiring conducted to a negative electrode of the battery, a fixing hole in a housing of the on-board electric compressor, and a ground wiring provided in the fixing hole and conducted to the housing, and a capacitor element consisting of a single capacitor or a plurality of capacitors can be connected between the power supply wiring and the ground wiring. The control board has a power supply pad, a ground pad, and a GND pad, and is provided with a separation pattern separated from the power supply wiring, the GND wiring, and the ground wiring, a power supply side pad provided on the power supply wiring, a ground side pad provided on the ground wiring, and a GND side pad provided on the GND wiring, the power supply pad can be connected to the power supply side pad by a conductor, and the GND pad is connected to the GND side pad by a conductor. Since the ground pad can be connected to the ground side pad via a capacitor element, for example, as in the inventions of claims 2, 3 and 6, when a capacitor element consisting of a single capacitor or multiple capacitors is connected between the power supply wiring and the ground wiring, the GND pad is not connected to the GND side pad, but the power supply pad is connected to the power supply side pad via a conductor, and the capacitor element is connected between the ground pad and the ground side pad, and when a capacitor element is not connected, the power supply pad is not connected to the power supply side pad, and no capacitor element is connected between the ground pad and the ground side pad, and the GND pad is connected to the GND side pad via a conductor, thereby eliminating the need to modify the pattern layout of the control board depending on whether or not a capacitor element is mounted.

[0017] In addition, when no capacitor element is mounted, the separation pattern is separated from the power supply wiring and connected to the GND wiring, so that the separation pattern has the same potential as the GND wiring. This prevents the separation pattern from acting as an antenna, and therefore eliminates or suppresses the inconvenience of increased electromagnetic noise.

[0018] In addition, when the capacitor element is not connected, the same effect can be obtained by connecting the separation pattern to the ground wiring as in the inventions of claims 4 and 7. However, the ground wiring is usually provided in the fixing hole for fixing the control board to the housing as in the invention of claim 5, but the GND wiring is usually provided over a wide area of ​​the control board, so by connecting the separation pattern to the GND wiring as in the inventions of claims 3 and 6, the wiring and connection work becomes easier.

[0019] The present invention is extremely effective in an on-vehicle electric compressor such as that according to the fifth aspect of the invention. [Brief description of the drawings]

[0020] [Figure 1] 1 is a schematic cross-sectional view of an in-vehicle electric compressor according to an embodiment of the present invention; [Diagram 2] FIG. 2 is an electric circuit diagram of the in-vehicle electric compressor and the control board of FIG. 1. [Diagram 3] 3 is a schematic diagram illustrating the power supply wiring, GND wiring, ground wiring, and separation patterns of the control board of FIG. 2. [Figure 4] FIG. 3 is a schematic diagram for explaining the power supply wiring, GND wiring, ground wiring, and separation pattern of the control board in the state of FIG. 2 (when a capacitor element is mounted (connected)). [Diagram 5] FIG. 2 is an electric circuit diagram of the on-board electric compressor and the control board of FIG. 1 when a specific capacitor element is not mounted (connected) (Example 1). [Figure 6] 6 is a schematic diagram for explaining the power supply wiring, GND wiring, ground wiring, and separation pattern of the control board in the case of FIG. 5. FIG. [Figure 7] FIG. 11 is a schematic diagram for explaining the power supply wiring, GND wiring, ground wiring, and separation pattern of a control board of another embodiment in the case where a specific capacitor element is not mounted (connected) (Example 2). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. First, an in-vehicle electric compressor (a so-called inverter-integrated in-vehicle electric compressor) 1 according to an embodiment to which the present invention is applied will be described with reference to Fig. 1. The in-vehicle electric compressor 1 according to the embodiment constitutes a part of a refrigerant circuit of a vehicle air conditioner mounted in an electric vehicle such as a hybrid vehicle or an electric vehicle. EXAMPLES

[0022] (1) Configuration of Vehicle-Mounted Electric Compressor 1 1, an in-vehicle electric compressor 1 of the embodiment has a cylindrical housing 2 made of metal (made of aluminum of a predetermined thickness in the embodiment). The inside of this housing 2 is divided into a compression mechanism accommodating section 4 and an inverter accommodating section 6 by a partition wall 3 that intersects with the axial direction of the housing 2. The compression mechanism accommodating section 4 accommodates, for example, a scroll type compression mechanism 7 and a motor 8 that drives the compression mechanism 7.

[0023] In this case, the motor 8 of the embodiment is an interior permanent magnet synchronous motor (IPMSM) that is composed of a stator 9 fixed to the housing 2 and a rotor 11 that rotates inside the stator 9.

[0024] A bearing 12 is formed in the center of the partition wall 3 on the compression mechanism accommodating section 4 side, one end of a drive shaft 13 of the rotor 11 is supported by this bearing 12, and the other end of the drive shaft 13 is connected to the compression mechanism 7. A suction port 14 is formed near the partition wall 3 at a position corresponding to the compression mechanism accommodating section 4 of the housing 2, and when the rotor 11 (drive shaft 13) of the motor 8 rotates to drive the compression mechanism 7, a low-temperature refrigerant, which is a working fluid, flows from the suction port 14 into the compression mechanism accommodating section 4 of the housing 2, and is sucked into the compression mechanism 7 and compressed.

[0025] The refrigerant compressed by the compression mechanism 7 and having a high temperature and pressure is discharged from a discharge port (not shown) into the refrigerant circuit outside the housing 2. The low-temperature refrigerant that flows in from the suction port 14 passes near the partition wall 3 and around the motor 8, and is sucked into the compression mechanism 7, thereby cooling the motor 8 and the partition wall 3 as well.

[0026] An inverter device 16 that drives and controls the motor 8 is accommodated in the inverter accommodating section 6 that is separated from the compression mechanism accommodating section 4 by the partition wall 3. In this case, the inverter device 16 is configured to supply power to the motor 8 via sealed terminals and lead wires that penetrate the partition wall 3.

[0027] (2) Structure of inverter device 16 The inverter device 16 of the embodiment is composed of a control board 17 of the present invention, six switching elements 18 wired on one side of the control board 17, and an HV connector, an LV connector, etc. (not shown). In the embodiment, each switching element 18 is composed of an insulated gate bipolar transistor (IGBT) with a MOS structure incorporated in the gate portion.

[0028] In this case, each switching element 18 constitutes a three-phase inverter circuit 19 described later, and a terminal portion 22 of each switching element 18 is connected to the control board 17. The inverter device 16 thus assembled is accommodated in the inverter accommodating portion 6 with the side on which each switching element 18 is located facing the partition wall 3, attached to the partition wall 3, and closed with a cover 23.

[0029] In this case, fixing holes 20 are formed in the control board 17, and the control board 17 is fixed to the partition wall 3 of the housing 2 by inserting metal bolts 21 into the fixing holes 20 and screwing the bolts 21 into bosses 24 standing from the partition wall 3. With the inverter device 16 attached to the partition wall 3 in this manner, each switching element 18 is in close contact with the partition wall 3 directly or via a predetermined insulating and heat conductive material and is in a heat exchange relationship with the partition wall 3 of the housing 2, so that each switching element 18 is cooled by the refrigerant drawn through the partition wall 3.

[0030] (3) Electric circuit of inverter device 16 Next, the electric circuit of the inverter device 16 of the embodiment will be described with reference to Fig. 2. In the figure, 26 is a high-voltage (for example, about DC 300V) battery (vehicle battery) mounted on the electric vehicle. 27 is a power supply wiring connected to the positive electrode (+) of the battery 26 via a LISN (lancing circuit network), and 28 is a GND wiring connected to the negative electrode (-) of the battery 26 via a LISN. An EMI filter 29 and a smoothing capacitor 31 are connected to the power supply wiring 27 and the GND wiring 28. The EMI filter 29 and the smoothing capacitor 31 are connected between the battery 26 and the switching element 18 of the inverter circuit 19.

[0031] The EMI filter 29 is composed of an X capacitor 32 connected between the power supply wiring 27 and the GND wiring 28, normal mode coils 33 and 34 connected respectively to both the power supply wiring 27 and the GND wiring 28 downstream of the X capacitor 32, a common mode coil 36 connected downstream of these normal mode coils 33 and 34, a plurality of capacitor elements 38A, 38B connected respectively between the power supply wiring 27 and the ground wiring 37 downstream of the common mode coil 36, and a plurality of capacitor elements 39A, 39B connected respectively between the GND wiring 28 and the ground wiring 37.

[0032] Capacitor elements 38A, 38B, 39A, and 39B are called Y capacitors, and each is composed of a single ceramic capacitor (surface mounting type) or a plurality of ceramic capacitors (capacitor group) connected in series. Ground wiring 37 is provided around the fixing hole 20 of control board 17. Then, the bolt 21 is screwed into boss portion 24, so that ground wiring 37 is conducted to housing 2 through the bolt 21. Housing 2 is connected to body 41 of the electric vehicle. Reference numeral 42 denotes a shunt resistor connected to GND wiring 28.

[0033] The power supply wiring 27, the GND wiring 28, and the ground wiring 37 are patterned on the control board 17. The X capacitor 32 is a capacitor for reducing normal mode noise, and the capacitor elements 38A, 38B, 39A, and 39B (Y capacitors) are capacitors for reducing common mode noise. The smoothing capacitor 31 is a capacitor for smoothing voltage ripples.

[0034] A control circuit (not shown) is mounted on the control board 17, and this control circuit is composed of a microcomputer having a processor. In this embodiment, a rotation speed command value is input from the ECU of the electric vehicle, and the phase current of the motor 8 is detected and calculated using the shunt resistor 42. Based on this, the ON / OFF state of the switching element 18 of the inverter circuit 19 is controlled to make the DC voltage of the battery 26 a three-phase AC output of UVW phases, which is applied to the stator 9 of each phase of the motor 8 to drive the motor 8.

[0035] (4) Wiring structure of control board 17 Next, the wiring structure of the control board 17 of the embodiment will be described with reference to Figures 2 and 3. In Figure 3, reference numeral 43 denotes a separation pattern formed at a location where the capacitor elements 38A and 38B are mounted. This separation pattern 43 is formed on the control board 17 in a form separated from the power supply wiring 27, the GND wiring 28, and the ground wiring 37.

[0036] In this case, a power supply pad 46, a ground pad 47, and a GND pad 48 are formed on the separation pattern 43. Meanwhile, a power supply side pad 51 is formed on the power supply wiring 27 near the separation pattern 43, a ground side pad 52 is formed on the ground wiring 37, and a GND side pad 53 is formed on the GND wiring 28.

[0037] As described above, GND wiring 28 is formed over a wide range of control board 17, but ground wiring 37 is formed around fixing hole 20, and therefore separation pattern 43 is formed extending from the vicinity of power supply wiring 27 to the vicinity of ground wiring 37. Note that, although only capacitor element 38A is shown in detail in Fig. 2, capacitor element 38B is also provided with separation pattern 43 and pads similar to those in Fig. 3.

[0038] (5) When capacitor element 38A is installed As described above, when manufacturing control board 17, in actual development, an electromagnetic noise test (EMC test) is performed to determine whether or not to mount capacitor elements 38A, 38B (Y capacitors) on control board 17, thereby optimizing the design. Figures 2 and 4 show the case where capacitor element 38A is mounted.

[0039] When mounting the capacitor element 38A, the power supply pad 46 of the separation pattern 43 and the power supply side pad 51 of the power supply wiring 27 are connected by solder 61 as a conductor, as shown in Fig. 4. Furthermore, the capacitor element 38A is connected between the ground pad 47 of the separation pattern 43 and the ground side pad 52 of the ground wiring 37 using solder 61 as a conductor. However, the GND pad 48 of the separation pattern 43 is not connected to the GND side pad 53 of the GND wiring 28. As a result, the capacitor element 38A is connected between the power supply wiring 27 and the ground wiring 37. The above is also the case when mounting the capacitor 38B.

[0040] (6) When capacitor element 38A is not installed (part 1) 5 and 6 show a case where the capacitor element 38A is not mounted. If it is decided not to mount the capacitor element 38A in the electromagnetic noise test, the power supply pad 46 of the separation pattern 43 is not connected to the power supply side pad 51 of the power supply wiring 27. In addition, the capacitor element 38A is not connected between the ground pad 47 of the separation pattern 43 and the ground side pad 52 of the ground wiring 37. Then, the GND pad 48 of the separation pattern 43 and the GND side pad 53 of the GND wiring 28 are connected by the solder 61 as a conductor. This makes the separation pattern 43 have the same potential as the GND wiring, prevents the separation pattern 43 from acting as an antenna, and eliminates or suppresses the inconvenience of increasing electromagnetic noise. The above is also true in the case where the capacitor 38B is not mounted.

[0041] As described above, in the present invention, the separated pattern 43 having the power supply pad 46, the ground pad 47, and the GND pad 48 and separated from the power supply wiring 27, the GND wiring 28, and the ground wiring 37 is formed on the control board 17, the power supply side pad 51 is provided on the power supply wiring 27, the ground side pad 52 is provided on the ground wiring 37, and the GND side pad 53 is provided on the GND wiring 28, so that the power supply pad 46 can be connected to the power supply side pad 51 by solder 61, the GND pad 48 can be connected to the GND side pad 53 by solder 61, and the ground pad 47 can be connected to the ground side pad 52 via the capacitor element 38A. When connecting capacitor element 38A which serves as a Y capacitor, GND pad 48 is not connected to GND side pad 53, power supply pad 46 is connected to power supply side pad 51 with solder 61, and capacitor element 38A is connected between ground pad 47 and ground side pad 52. When capacitor element 38A is not connected, power supply pad 46 is not connected to power supply side pad 51, and capacitor element 38A is not connected between ground pad 47 and ground side pad 52, and GND pad 48 is connected to GND side pad 53 with solder 61. This eliminates the need to modify the pattern layout of control board 17 depending on whether or not capacitor element 38A is mounted.

[0042] Furthermore, when the capacitor element 38A is not mounted, the separation pattern 43 is separated from the power supply wiring 27 and connected to the GND wiring 28, so that the separation pattern 43 has the same potential as the GND wiring 28. This prevents the separation pattern 43 from acting as an antenna, so that the inconvenience of increased electromagnetic noise can be eliminated or suppressed. EXAMPLES

[0043] (7) When capacitor element 38A is not installed (part 2) 7 shows another example in which the capacitor element 38A is not mounted. In this case, the power supply pad 46 of the separation pattern 43 is not connected to the power supply side pad 51 of the power supply wiring 27. Also, the GND pad 48 of the separation pattern 43 and the GND side pad 53 of the GND wiring 28 are not connected. Meanwhile, the capacitor element 38A is not connected between the ground pad 47 of the separation pattern 43 and the ground side pad 52 of the ground wiring 37, and the ground pad 47 is electrically connected to the ground side pad 52 of the ground wiring 37 by the solder 61 as a conductor. The above is also the case in which the capacitor 38B is not mounted.

[0044] This also grounds the separation pattern 43, preventing it from acting as an antenna, and makes it possible to eliminate or suppress the inconvenience of increased electromagnetic noise. However, since the ground wiring 37 is provided in the fixing hole 20 for fixing the control board 17 to the housing 2, the wiring and connection work is easier in the above-mentioned embodiment (embodiment 1) in which the ground wiring 37 is connected to the GND wiring 28 provided over a wide area. [Explanation of symbols]

[0045] 1. Vehicle-mounted electric compressor 2. Chassis 8 Motor 17 Control Board 18 Switching elements 19 Inverter circuit 20 fixing hole 21 Volts 26 Battery 27 Power wiring 28 GND wiring 37 Ground wiring 38A, 38B Capacitor elements 46 Power Pad 47 Grounding Pad 48 GND pad 51 Power supply pad 52 Ground pad 53 GND side pad 61 Solder (conductor)

Claims

1. A control board for an on-board electric compressor, comprising: a power supply wiring that is conducted to a positive electrode of a battery mounted on a vehicle; a GND wiring that is conducted to a negative electrode of the battery; a fixing hole in a housing of the on-board electric compressor; and a ground wiring that is provided in the fixing hole and is conducted to the housing, and a capacitor element made of a single or multiple capacitors can be connected between the power supply wiring and the ground wiring, a separation pattern having a power supply pad, a ground pad, and a GND pad, the separation pattern being separated from the power supply wiring, the GND wiring, and the ground wiring; a power supply side pad provided on the power supply wiring; a ground side pad provided on the ground wiring; A GND side pad is provided on the GND wiring, the power supply pad is connectable to the power supply side pad by a conductor; the GND pad is connectable to the GND side pad by a conductor; 4. A control board for an in-vehicle electric compressor, comprising: a capacitor element connected to said ground pad;

2. The GND pad is not connected to the GND side pad, The power supply pad is connected to the power supply side pad by the conductor; 2. The control board for an in-vehicle electric compressor according to claim 1, wherein the capacitor element is connected between the ground pad and the ground side pad.

3. The power supply pad is not connected to the power supply side pad, Without connecting the capacitor element between the ground pad and the ground side pad, 2. The control board for an in-vehicle electric compressor according to claim 1, wherein the GND pad is connected to the GND side pad by the conductor.

4. The power supply pad is not connected to the power supply side pad, Without connecting the GND pad to the GND side pad, 2. The control board for an in-vehicle electric compressor according to claim 1, wherein the ground pad is connected to the ground side pad by a conductor.

5. 5. An on-vehicle electric compressor, comprising: a control board for an on-vehicle electric compressor according to claim 1, wherein the control board is fixed to the housing by a bolt inserted into the fixing hole, and the ground wiring is conducted to the housing through the bolt in this state.

6. A method for manufacturing a control board for an in-vehicle electric compressor, the control board including a power supply line that is connected to a positive electrode of a battery mounted on a vehicle, a GND line that is connected to a negative electrode of the battery, a fixing hole for a housing of the in-vehicle electric compressor, and a grounding line that is provided in the fixing hole and is connected to the housing, the method comprising the steps of: a separation pattern having a power supply pad, a ground pad, and a GND pad, and separated from the power supply wiring, the GND wiring, and the ground wiring; A power supply side pad is provided on the power supply wiring, A ground side pad is provided on the ground wiring, a GND side pad is provided on the GND wiring; When a capacitor element consisting of a single capacitor or a plurality of capacitors is connected between the power supply wiring and the ground wiring, the GND pad is not connected to the GND side pad, the power supply pad is connected to the power supply side pad by a conductor, and the capacitor element is connected between the ground pad and the ground side pad, When the capacitor element is not connected, the power supply pad is not connected to the power supply side pad, and the capacitor element is not connected between the ground pad and the ground side pad. a first pad for grounding the first conductive material and a second pad for grounding the first conductive material, the second pad being electrically connected to the first pad;

7. A method for manufacturing a control board for an in-vehicle electric compressor, the control board including a power supply line that is connected to a positive electrode of a battery mounted on a vehicle, a GND line that is connected to a negative electrode of the battery, a fixing hole for a housing of the in-vehicle electric compressor, and a grounding line that is provided in the fixing hole and is connected to the housing, the method comprising the steps of: a separation pattern having a power supply pad, a ground pad, and a GND pad, and separated from the power supply wiring, the GND wiring, and the ground wiring; A power supply side pad is provided on the power supply wiring, A ground side pad is provided on the ground wiring, a GND side pad is provided on the GND wiring; When a capacitor element consisting of a single capacitor or a plurality of capacitors is connected between the power supply wiring and the ground wiring, the GND pad is not connected to the GND side pad, the power supply pad is connected to the power supply side pad by a conductor, and the capacitor element is connected between the ground pad and the ground side pad, When the capacitor element is not connected, the power supply pad is not connected to the power supply side pad, and the GND pad is not connected to the GND side pad. a ground pad connected to the ground side pad by a conductor,

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