WO2023228641A1

WO2023228641A1 - Inverter device and electric compressor comprising same

Info

Publication number: WO2023228641A1
Application number: PCT/JP2023/015932
Authority: WO
Inventors: 康平 ▲高▼田; 浩吉田; 孝次小林; 翔太郎高橋
Original assignee: サンデン株式会社; 学校法人成蹊学園
Priority date: 2022-05-24
Filing date: 2023-04-21
Publication date: 2023-11-30
Also published as: JP2023172700A

Abstract

[Problem] To provide an inverter device that efficiently reduces common mode noise which flows out from a switching element and a motor, and that enables a reduction in size. [Solution] The present invention comprises an input-side common mode coil 67 that is inserted in a monophase input part of an inverter circuit, and an output-side common mode coil 66 that is inserted in a three-phase output part of the inverter circuit 34. The input-side common mode coil 67 and the output-side common mode coil 66 are a common mode coil 69 of an integral structure and of a shared core. In the inverter circuit 34, there is no circuit in which directly joins a bypass capacitor middle point of a three-phase output LC filter circuit and a bypass capacitor middle point of an input filter circuit. There is impedance in the path of common mode current flowing out from the inverter circuit 34 due to the common mode coil 69 of the integral structure.

Description

Inverter device and electric compressor equipped with it

The present invention relates to an inverter device that drives a motor, and an electric compressor equipped with the inverter device.

To suppress EMI noise in three-phase inverter equipment, conventional methods include reducing noise using an EMI filter on the input side, inserting a large common mode coil into the inverter output line, or using a passive filter method in combination with a capacitor. Due to this, measures were taken to reduce noise caused by the inverter.

In addition, in the noise of inverter equipment, there is a lot of common mode noise that flows out between the motor and the housing and from the heat sink (which also serves as the housing in an electric compressor as described later) that cools the switching element. Among these, noise leaking from between the motor and the housing has traditionally been reduced by inserting a large common mode coil into the input section, and by inserting a common mode coil and ferrite core into the inverter output section. Ta.

On the other hand, with regard to noise leaking through the heat sink, countermeasures such as not grounding the heat sink and housing have been possible in consumer products.

For example, in a vehicle-mounted electric compressor, it is essential to reduce the size and weight (including vibration countermeasures), and to prevent noise as described above, it is necessary to install a common mode coil in the inverter output section. It is difficult to take countermeasures such as attaching a ferrite core, and the switching element is cooled by using the electric compressor housing instead of the heat sink, and cooling with refrigerant is used. ) There have been no effective measures to suppress the common mode noise flowing out from the noise source.

Therefore, conventionally, countermeasures have been considered using methods described in Patent Document 1 and Non-Patent Document 1, for example.

Japanese Patent Application Publication No. 2005-130575

FIG. 8 shows a common mode equivalent circuit of the electric circuit shown in FIG. 1 of Patent Document 1 mentioned above. Although Patent Document 1 reduces noise in this path by coupling input and output filters of the inverter, it is impossible to suppress leakage through the heat sink due to the circuit configuration. That is, since there is no impedance in the path of the common mode current (I _CMh in FIG. 8) leaking from the switching element to the heat sink (housing), the common mode current flowing out from the inverter cannot be blocked. This is because a bypass capacitor (Y capacitor) is grounded between the common mode coil of the three-phase input section and the rectifier side, so inverter noise flows out through this path. The configuration of Patent Document 1 is simply a combination of an input common mode coil and an output common mode coil.

Next, the circuit of the general motor drive system described in Non-Patent Document 1 is shown in FIG. 9, and the common mode equivalent circuit is shown again on the left side of FIG. The noise path caused by the inverter in the motor drive system shown in FIG. 9 can be considered to be the path shown on the right side of FIG. 10 when an equivalent circuit is created focusing on the common mode. Here, Loop 1 on the right side of Figure 10 is the common mode noise path that flows out from between the motor and the housing and goes around LISN (power impedance stabilization network), and Loop 2 also flows out from the motor, but is the path of common mode noise that flows out from the switching element. This is the route that goes around via the stray capacitance between the cases.

Here, in Loop1 and Loop2, by inserting a common mode coil into the inverter output line as described above, the impedance of the common mode current path can be increased and suppressed.

However, in an electric compressor where the heat sink and housing are integrated, in order to suppress the common mode current in Loop 3 on the right side of Fig. 10 (path flowing out from the switching element and returning to LISN), it is necessary to install a large An EMI filter is required. That is, in order to effectively suppress all common mode noise, large common mode filters are required for input and output, and this is difficult to apply to electric compressors that require miniaturization of equipment.

In addition, the common mode noise flowing out from Loop 3 contains many high frequency components, so even if a large common mode filter is installed in the input section, the impedance of the coil will decrease at high frequencies, so it is difficult to suppress the EMI level. It's not easy.

Against this background, in Non-Patent Document 1, as shown in FIG. 11, in the inverter circuit 100, the midpoint of the bypass capacitor 101 of the three-phase output LC filter circuit and the bypass capacitor 102 of the input filter circuit are connected. The circuit configuration is such that the midpoints are directly connected, and an input/output coupling EMI coil is utilized. As a result, the common mode equivalent circuit in FIG. 11 becomes as shown in FIG. 12, and all of the noise in Loop1, Loop2, and Loop3 can be suppressed in the vicinity of the switching element that is the source of the leakage.

With this background in mind, the present invention aims to reduce EMI noise caused by inverter noise in general three-phase inverters (particularly electric compressors) by increasing the size of the input side EMI filter and by increasing the size of input-output bypass capacitors ( An inverter device that can efficiently reduce common mode noise flowing from switching elements and motors by increasing the common mode impedance in all paths before and after the noise generation source, rather than by coupling the Y capacitor). and an electric compressor equipped with the same.

Another object of the present invention is to achieve miniaturization while maintaining the noise reduction effect by eliminating the need for differential mode capacitors and common mode capacitors (C _CM , C _DM ) used in Non-Patent Document 1. That's true.

The inverter device of the present invention includes a three-phase inverter circuit composed of switching elements, drives a motor by this inverter circuit, and includes an input common mode coil inserted into a single-phase input section of the inverter circuit. and an output side common mode coil inserted into the three-phase output section of the inverter circuit. The circuit does not have a circuit that directly connects the midpoint of the bypass capacitor of the three-phase output LC filter circuit to the midpoint of the bypass capacitor of the input filter circuit, and uses an integrated common mode coil to reduce the common mode current flowing out from the inverter circuit. The path is characterized by having an impedance.

In the inverter device of the invention of claim 2, in the above invention, the two wires on the positive and negative sides of the input side common mode coil and the three wires on the UVW phase of the output side common mode coil are wound around the core in a pentafilar manner. It is characterized by the presence of

The inverter device of the invention of claim 3 is characterized in that the input side common mode coil and the output side common mode coil have the same common mode inductance in the invention of claim 1.

The inverter device of the invention of claim 4 is characterized in that the input side common mode coil and the output side common mode coil have different common mode inductances in the invention of claim 1.

An electric compressor according to a fifth aspect of the invention includes a housing in which a motor is housed, and an inverter accommodating part configured in this housing, and the inverter device of each of the above inventions is housed in the inverter accommodating part, and the housing is It is characterized by being used as a heat sink for switching elements.

The electric compressor of the invention according to claim 6 is characterized in that it is mounted on a vehicle in the above invention.

According to the present invention, a three-phase inverter circuit composed of switching elements is provided, and a motor is driven by this inverter circuit, and an input side common mode coil inserted in a single-phase input section of the inverter circuit and , the output side common mode coil is inserted into the three-phase output part of the inverter circuit, and the input side common mode coil and the output side common mode coil are integrated common mode coils with a common core, thereby eliminating the noise generation source. By magnetically coupling the input and output sides of an inverter circuit, the impedance before and after the noise source can be increased.

This suppresses all common mode current flowing out through the stray capacitance between the motor and the housing that houses it, as well as the stray capacitance between the switching elements of the inverter circuit and the housing, significantly reducing common mode noise. You will be able to aim for

In addition, since the input side common mode coil and the output side common mode coil are magnetically coupled, it can be handled with only one core and the number of turns can be reduced. As a result, the inverter device is accommodated in the housing as in the inventions of claims 5 and 6, which is extremely advantageous for electric compressors that need to be downsized. Furthermore, since this is a source measure that prevents noise from leaking into the housing, it is highly effective in suppressing high frequency noise.

In particular, in the inverter circuit, there is no circuit that directly connects the midpoint of the bypass capacitor of the three-phase output LC filter circuit to the midpoint of the bypass capacitor of the input filter circuit, and the integral structure of the common mode coil prevents the flow from flowing out of the inverter circuit. Since the common mode current path has a large impedance, the capacitor that requires a creepage distance can be removed while maintaining the noise reduction effect, making it possible to achieve further miniaturization.

Moreover, as in the invention of claim 2, by winding the two wires of the positive and negative poles of the input side common mode coil and the three wires of the UVW phase of the output side common mode coil around the core in a pentafilar manner, an inverter circuit can be created. It becomes possible to effectively magnetically couple the common mode coils on the input side and output side.

Note that the input side common mode coil and the output side common mode coil may have the same common mode inductance as in the invention of claim 3, or may have different common mode inductances as in the invention of claim 4.

1 is a block diagram of an electric circuit of an electric compressor according to an embodiment of the present invention; FIG. 1 is a schematic cross-sectional view of an electric compressor according to an embodiment of the present invention. It is a simple common mode equivalent circuit of the electric circuit of FIG. 1. FIG. 2 is a diagram illustrating the structure of common mode coils inserted into the input section and output section of the inverter circuit of the electric compressor shown in FIG. 1. FIG. 5 is a diagram illustrating impedance characteristics of the common mode coil in FIG. 4. FIG. 2 is a diagram illustrating noise in a high voltage circuit in the electric compressor of FIG. 1. FIG. 2 is a diagram illustrating noise in a low voltage circuit in the electric compressor of FIG. 1. FIG. This is a simple common mode equivalent circuit of the electric circuit of Patent Document 1. 2 is a circuit diagram of a general motor drive system of Non-Patent Document 1. FIG. This is a simple common mode equivalent circuit of FIG. 9. 2 is a block diagram of an electric circuit of Non-Patent Document 1. FIG. 12 is a simplified common mode equivalent circuit of FIG. 11.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. First, an electric compressor (so-called inverter-integrated electric compressor) 1 according to an embodiment of the present invention will be described with reference to FIG. The electric compressor 1 of the embodiment constitutes a part of a refrigerant circuit of a vehicle air conditioner mounted on an electric vehicle.

(1) Structure of the electric compressor 1 In FIG. 2, the inside of the metallic cylindrical housing (casing) 2 of the electric compressor 1 is partitioned by a partition wall 3 that intersects in the axial direction of the housing 2. The compression mechanism housing section 4 houses, for example, a scroll-type compression mechanism 7 and a motor 8 that drives the compression mechanism 7.

In this case, the motor 8 of the embodiment is an IPMSM (Interior Permanent Magnet Synchronous Motor) consisting of a stator 9 fixed to the housing 2 and a rotor 11 rotating inside the stator 9.

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

The refrigerant compressed by the compression mechanism 7 to a high temperature and high pressure is discharged to the refrigerant circuit outside the housing 2 from a discharge port (not shown). Further, the low-temperature refrigerant flowing in from the suction port 14 passes near the partition wall 3, passes around the motor 8, and is sucked into the compression mechanism 7, so that the partition wall 3 is also cooled.

The inverter device 16 of the present invention that drives and controls the motor 8 is housed in the inverter housing section 6 that is separated from the compression mechanism housing section 4 by the partition wall 3 . In this case, the inverter device 16 is configured to supply power to the motor 8 via a sealed terminal or lead wire that penetrates the partition wall 3 .

(2) Structure of the inverter device 16 The inverter device 16 according to one embodiment of the present invention includes a substrate 17, six switching elements 18 wired on one side of the substrate 17, and wired on the other side of the substrate 17. It is composed of a control circuit 36 and the like. In the embodiment, each switching element 18 is composed of an insulated gate bipolar transistor (IGBT) or the like in which a MOS structure is incorporated in the gate portion.

In this case, each switching element 18 constitutes a three-phase inverter circuit 34 to be described later, and the terminal portion 22 of each switching element 18 is connected to the substrate 17. The inverter device 16 assembled in this way is housed in the inverter accommodating portion 6 and attached to the partition wall 3 with one side on which each switching element 18 is located facing the partition wall 3, and is attached to the partition wall 3 with the cover 23. Blocked. In this case, the substrate 17 will be fixed to the partition wall 3 via the boss portion 24 that stands up 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 either directly or via a predetermined insulating heat conductive material, and is in a heat exchange relationship with the partition wall 3 of the housing 2. becomes. As described above, since the partition wall 3 is cooled by the refrigerant sucked into the compression mechanism housing section 4, each switching element 18A is in a heat exchange relationship with the sucked refrigerant through the partition wall 3. The switching elements 18 are cooled by the refrigerant sucked into the compression mechanism accommodating portion 4 through the thickness, and each switching element 18 itself radiates heat to the refrigerant through the partition wall 3. That is, the housing 2 (partition wall 3) serves as a heat sink for each switching element 18.

(3) Circuit configuration of inverter device 16 Next, in FIG. , a switching power supply device 39, a smoothing capacitor 47, and the like, which are wired on the substrate 17 described above and housed in the inverter accommodating portion 6 as described above.

The vehicle is equipped with a high voltage power source 41 consisting of, for example, a high voltage battery, for feeding and driving the motor 8 of the electric compressor 1 and a driving motor (not shown), and a low voltage power source 42 consisting of a normal battery. The inverter device 16 is connected to a high voltage power source 41 and a low voltage power source 42. Further, the housing 2 is electrically connected to the vehicle body B (ground plane).

The inverter circuit 34 is composed of the aforementioned six switching elements 18 connected in a three-phase bridge, and each switching element 18 is controlled by a gate drive signal generated by a gate driver included in the control circuit 36. The control circuit 36 is composed of a microprocessor (CPU), and performs PWM modulation by switching each switching element 18 of the inverter circuit 34 with a gate driver, thereby converting the DC voltage of the high voltage power supply 41 into an AC voltage of a predetermined frequency. and supplies it to the motor 8.

The switching power supply device 39 is a DC-DC converter that switches the low voltage power supply 42 to generate a predetermined DC voltage and supplies power to the control circuit 36. The switching power supply device 39 includes a switching transformer including an isolation transformer (coupling transformer) including a primary winding and a secondary winding insulated from the primary winding. The switching power supply device 39 switches the low-voltage power supply 42 to supply power to the control circuit 36, and also connects the low-voltage circuit 63 on the low-voltage power supply 42 side where the primary winding is located and the secondary winding through the switching transformer. It is insulated from the high voltage circuit 64 on the high voltage power supply 41 side where the line is located. The inverter device 16 is configured such that the high voltage circuit 64 and the low voltage circuit 63 which are insulated as described above are placed close to each other on the substrate 17, and is housed in the inverter accommodating portion 6.

Here, as mentioned above, the surge voltage (oscillating voltage) accompanying the switching of the switching element 18 constituting the inverter circuit 34 is transmitted to the motor 8 side. Mode current flows out. Furthermore, there is also a common mode current that flows out through the stray capacitance between the inverter circuit 34 and the housing 2, which is a source of noise generation.

In particular, in the electric compressor 1 in which the housing 2 is used as a heat sink for the switching element 18 of the inverter circuit 34 as in the embodiment, the stray capacitance between the motor 8 and the housing 2 and the stray capacitance between the inverter circuit 34 and the housing 2 The noise caused by the common mode current flowing out (common mode noise) becomes dominant.

Therefore, in the present invention, the input side common mode coil 67 is inserted into the single-phase input section (two wires) of the inverter circuit 34, and the input side common mode coil 67 is inserted into the three-phase output section (three wires between the inverter circuit 34 and the motor 8) of the inverter circuit 34. An output side common mode coil 66 is inserted (Fig. 1). In this case, as shown in FIG. 4, the input side common mode coil 67 and the output side common mode coil 66 are wound around one common core 68 to form a common mode coil 69 having an integral structure. Thereby, the input side common mode coil 67 and the output side common mode coil 66 are magnetically coupled.

Furthermore, in the case of this embodiment, the input side common mode coil 67 has a positive electrode wire (winding: coil) 67H connected to the positive electrode side of the high voltage power supply 41, and a negative electrode wire (winding: coil) connected to the negative electrode side. ) Consisting of 67L. Further, the output side common mode coil 66 has a U phase line (winding: coil) 66U connected to the U phase of the output of the inverter circuit 34, and a V phase line (winding: coil) 66V connected to the V phase. , W phase wire (winding: coil) 66W connected to W phase. Then, these two

wires

67H and 67L on the positive and negative electrode sides, and the three

wires

66U, 66V, and 66W on the UVW phase, a total of five wires, are wound in parallel around the core 68 in a pentafilar manner, for example, as shown in FIG. There is. Note that the arrows in FIG. 4 indicate the direction of magnetic flux.

FIG. 3 shows a simplified common mode equivalent circuit of the electric circuit of FIG. 1. In the figure, V _CM is the common mode voltage based on the DC input midpoint output by the inverter circuit 34, C _sm is the stray capacitance between the windings of the motor 8 and the housing 2, and 3C _sh is the voltage between the switching element 18 and the housing 2. The stray capacitance L _CM /4 is the inductance (common mode inductance) of each

common mode coil

66, 67, and in the embodiment, the inductance of the input side common mode coil 67 and the inductance of the output side common mode coil 66 are the same L _CM /4. Further, R _LISN /2 is the terminating resistance at the output terminals of

LISNs

37 and 38, and L _wi , L _wo , R _wi , and R _wo are the inductance and resistance of the input-side and output-side cables, respectively.

As shown in FIG. 3, since the inductances of the common mode coils 66 and 67 are arranged in all the common mode current loops, it is possible to effectively suppress both the input and output common mode currents. That is, due to the integral structure of the common mode coil 69, the path of the common mode current flowing from the inverter circuit 34 to the housing 2 has a large impedance. In addition, in the common mode coil 69 of the embodiment, the five input and

output wires

67H, 67L, 66U, 66V, and 66W are magnetically coupled by winding them in parallel around the core 68 in a pentafilar manner. Compared to this, it is possible to reduce the inductance of the common mode coil (common mode inductance) that must be connected to one-fourth.

That is, in order to obtain the necessary common mode inductance with a normal EMI filter, if it is necessary to connect a common mode coil on the input side and a common mode coil on the output side with an inductance of L _CM , the present invention If the output side common mode coil 66 and the input side common mode coil 67 are magnetically coupled as shown in _FIG .

L100 in FIG. 5 shows the impedance frequency characteristic when a three-phase common mode coil is inserted only in the output section of the inverter circuit 34, and L1 shows the impedance frequency characteristic in the case of the common mode coil in FIG. 4. From this figure, it can be seen that both are approximately equal except for high frequencies.

Next, (a) in FIG. 6 shows the noise measurement results of the high voltage circuit 64 in FIG. 1, where the horizontal axis is frequency and the vertical axis is noise. Also, L101 is when no common mode coil is inserted into the output part of the inverter circuit 34, L102 is when a three-phase common mode coil is inserted only into the output part of the inverter circuit 34, and L2 is when the common mode coil 69 in FIG. 4 is used. It shows. Further, (b) in FIG. 7 shows the improvement difference: L102-L2.

(a) in FIG. 7 shows the noise measurement results of the low voltage circuit 63 in FIG. 1, where the horizontal axis is frequency and the vertical axis is noise. Also, L103 is when no common mode coil is inserted into the output part of the inverter circuit 34, L104 is when a three-phase common mode coil is inserted only into the output part of the inverter circuit 34, and L3 is when the common mode coil 69 in FIG. 4 is used. It shows. Further, (b) in FIG. 7 shows the difference: L104-L3.

In FIGS. 6(b) and 7(b), the larger the value is than 0, the more the noise is improved. As is clear from FIG. 6(b), in the case of the common mode coil 69 of the embodiment shown in FIG. ing. Furthermore, as is clear from FIG. 7(b), the noise of the low voltage circuit 63 has also been improved. This is considered to be due to noise improvement in the high voltage circuit 64 and the influence on the low voltage circuit 63 being suppressed.

As described above, according to the present invention, the input side common mode coil 67 inserted into the single-phase input part of the inverter circuit 34 and the output side common mode coil 66 inserted into the three-phase output part of the inverter circuit 45 are provided. Since the input side common mode coil 67 and the output side common mode coil 66 are integrated into the common core 68, the input side and output side of the inverter circuit 45, which is a noise generation source, are magnetically coupled and the impedance is increased. I can do it.

This suppresses all common mode currents flowing out through the stray capacitance between the motor 8 and the housing 2 and the stray capacitance between the switching element 18 of the inverter circuit 34 and the housing 2, and significantly reduces common mode noise. You will be able to aim for

Furthermore, since the input side common mode coil 67 and the output side common mode coil 66 are magnetically coupled, it is possible to use only one core 68, and the number of turns can also be reduced. As a result, the inverter device 16 is accommodated in the inverter accommodating portion 6 of the housing 2, which is extremely advantageous for the electric compressor 1 that needs to be downsized. Furthermore, since this is a source measure to prevent noise from leaking into the housing 2, the effect of suppressing high frequency noise is high.

In particular, in the inverter circuit 100 as in the conventional example shown in FIG. 11, the present invention does not include a circuit that directly connects the midpoint of the bypass capacitor 101 of the three-phase output LC filter circuit and the midpoint of the bypass capacitor 102 of the input filter circuit. First, in the present invention, the integrated common mode coil 69 has a structure in which the path of the common mode current flowing out from the inverter circuit 34 has a large impedance, so the creepage distance can be reduced while maintaining the noise reduction effect. By eliminating a large number of capacitors, further miniaturization can be achieved.

In addition, in the embodiment, the two wires of the positive and negative poles of the input common mode coil 67 and the three wires of the UVW phase of the output common mode coil 66 are wound in parallel around the core 68 in a pentafilar manner. , the common mode coils on the input side and output side of the inverter circuit 34 can be effectively magnetically coupled.

In the embodiment, the inductance of the input side common mode coil 67 and the inductance of the output side common mode coil 66 (common mode inductance) are set to be the same L _CM /4, but the invention is not limited to this. The side common mode coils 66 may have different inductances (common mode inductances). That is, in order to increase only the impedance on the input side of the inverter circuit 34, the number of turns of the input side common mode coil 67 may be increased to increase the common mode inductance, or in order to increase only the impedance on the output side. The common mode inductance may be increased by increasing the number of turns of the output side common mode coil 66.

In addition, in the embodiment, a high voltage power supply 41 consisting of a high voltage battery of about 300V DC and a low voltage power supply 42 consisting of a battery of about 12V DC are provided, and the DC voltage (HV15V, HV5V) from this low voltage power supply 42 to the high voltage circuit 64 side is ), but the present invention is not limited to this, and the direct current voltage (HV15V, HV5V) on the high voltage circuit 64 side may be directly generated from the high voltage power supply 41.

Further, in the embodiments, the present invention has been described using an inverter device that drives the motor of an electric compressor, but the inventions of

claims

1 and 2 are not limited thereto, and can be applied to various inverter devices that drive the motor. . Further, the specific configurations and numerical values shown in the examples are not limited to those, and can be variously changed without departing from the spirit of the present invention.

1 Electric compressor 2 Housing 3 Partition wall 6 Inverter housing 8 Motor 16 Inverter device 17 Board 18 Switching element 34 Inverter circuit 36 Control circuit 41 High voltage power supply 42 Low voltage power supply 66 Output side common mode coil 66U U phase line 66V V phase Wire 66W W phase line 67 Input side common mode coil 67H Positive electrode line 67L Negative electrode line 68 Core 69 Common mode coil

Claims

An inverter device comprising a three-phase inverter circuit configured with switching elements and driving a motor by the inverter circuit,
an input side common mode coil inserted into the single-phase input section of the inverter circuit;
comprising an output side common mode coil inserted in the three-phase output part of the inverter circuit,
The input side common mode coil and the output side common mode coil are integrally structured common mode coils with a common core, and
The inverter circuit does not have a circuit that directly connects the middle point of the bypass capacitor of the three-phase output LC filter circuit and the middle point of the bypass capacitor of the input filter circuit,
An inverter device characterized in that a common mode current path flowing out from the inverter circuit has an impedance due to the integrated common mode coil.
According to claim 1, the two wires of the positive and negative poles of the input common mode coil and the three UVW phase wires of the output common mode coil are wound around the core in a pentafilar manner. The inverter device described.
The inverter device according to claim 1, wherein the input side common mode coil and the output side common mode coil have the same common mode inductance.
The inverter device according to claim 1, wherein the input side common mode coil and the output side common mode coil have different common mode inductances.
comprising a housing in which the motor is housed, and an inverter housing part configured in the housing,
The inverter device according to any one of claims 1 to 4, wherein the inverter device is accommodated in the inverter accommodating portion, and the housing serves as a heat sink for the switching element. Equipped with an electric compressor.
The electric compressor according to claim 5, wherein the electric compressor is mounted on a vehicle.