WO2023228639A1 - Inverter device and electric compressor provided with same - Google Patents

Inverter device and electric compressor provided with same Download PDF

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Publication number
WO2023228639A1
WO2023228639A1 PCT/JP2023/015929 JP2023015929W WO2023228639A1 WO 2023228639 A1 WO2023228639 A1 WO 2023228639A1 JP 2023015929 W JP2023015929 W JP 2023015929W WO 2023228639 A1 WO2023228639 A1 WO 2023228639A1
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WIPO (PCT)
Prior art keywords
inverter
circuit
housing
inverter device
electric compressor
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Application number
PCT/JP2023/015929
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French (fr)
Japanese (ja)
Inventor
康平 ▲高▼田
辰樹 柏原
浩 吉田
孝次 小林
Original Assignee
サンデン株式会社
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Publication of WO2023228639A1 publication Critical patent/WO2023228639A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Definitions

  • the present invention relates to an inverter device that drives a motor, and an electric compressor equipped with the inverter device.
  • an electric compressor equipped with a motor is used instead of an engine-driven compressor.
  • the vehicle is equipped with a high-voltage power source consisting of a high-voltage battery of about 300 VDC, for example, and a low-voltage power source consisting of a normal battery of about 12 VDC, and the inverter circuit of the inverter device converts the DC voltage of the high-voltage power source into alternating current. This voltage is supplied to the motor of the electric compressor.
  • a control circuit that controls an inverter circuit of an inverter device is supplied with power by converting, for example, a DC voltage from a low-voltage power supply into a predetermined voltage (for example, DC 15V, etc.) using a switching power supply device. Therefore, a switching power supply device is provided with a switching transformer made of an isolation transformer, and a low voltage circuit on the primary side of the switching transformer is insulated from a high voltage circuit on the secondary side. That is, an inverter device including a high voltage circuit supplied with power from a high voltage power supply and a low voltage circuit supplied with power from a low voltage power supply is housed in an inverter accommodating portion configured in the housing of the electric compressor. It was considered to be a form.
  • FIG. 6 100 is a conventional electric compressor that constitutes a refrigerant circuit of a vehicle air conditioner mounted on an electric vehicle, and 2 indicates its housing.
  • a compression mechanism (not shown) and a motor 8 for driving the compression mechanism are housed in the housing 2
  • an inverter circuit 34 for driving the motor 8 and an inverter circuit 34 for controlling the inverter circuit 34 are housed in the inverter accommodating portion 6 of the housing 2.
  • An inverter device 103 including a control circuit 36, a high voltage circuit filter (EMI filter) 37, a low voltage circuit filter (EMI filter) 38, a switching power supply device 39, and the like is housed.
  • EMI filter high voltage circuit filter
  • EMI filter low voltage circuit filter
  • the vehicle has a high voltage power source (HV power source) 41 consisting of, for example, a high voltage battery of about 300 V DC, for supplying power to the motor 8 of the electric compressor 100 and a driving motor (not shown), and a high voltage power source (HV power source) 41 of about 12 V DC.
  • HV power source high voltage power source
  • LV power supply low voltage power supply
  • the inverter circuit 34 of the inverter device 103 is composed of six switching elements (not shown) including three-phase bridge-connected IGBTs, etc., and each switching element is driven by a gate drive signal generated by a gate driver included in the control circuit 36. controlled. Further, each switching element is arranged in a heat exchange relationship with the housing 2, and the heat generated by the switching element is released to the housing 2, so that the switching element is cooled. That is, the housing 2 serves as a heat sink for each switching element.
  • the control circuit 36 is composed of a microprocessor (CPU), and converts the DC voltage of the high voltage power supply 41 into an AC voltage of a predetermined frequency by switching each switching element of the inverter circuit 34 with a gate driver and performing PWM modulation. , is supplied to the motor 8.
  • CPU microprocessor
  • the high-voltage circuit filter 37 is connected between the high-voltage power supply 41 and the inverter circuit 34, and is composed of a common mode coil 43, Y capacitors 44 and 46, and a smoothing capacitor 47 in this example.
  • This high voltage circuit filter 37 functions to reduce EMI noise generated by switching of the inverter circuit 34.
  • the low voltage circuit filter 38 includes an X capacitor 48, a common mode coil 49, Y capacitors 51 and 52, and a smoothing capacitor 53.
  • the low voltage circuit filter 38 is connected between the low voltage power supply 42 and the switching power supply device 39, and functions to reduce EMI noise generated by switching in the switching power supply device 39.
  • the switching power supply device 39 is a DC-DC converter that switches the low voltage power supply 42 (DC 12V) to generate a predetermined DC voltage (HV15V, HV5V) and supplies power to the control circuit 36.
  • HV15V is a voltage supplied to a gate driver (which the control circuit 36 has) that generates a gate drive signal for the inverter circuit 34
  • HV5V is a voltage that serves as a power source for the control circuit 36.
  • the switching power supply device 39 includes a switching transformer 60 including an isolation transformer (coupling transformer) including a primary winding 56 and a secondary winding 57 insulated from the primary winding 56; It has a switching element 58 connected to. Then, according to the turns ratio of the switching transformer 60, the switching element 58 is controlled to output DC15V (HV15V) and DC5V (HV5V).
  • a switching transformer 60 including an isolation transformer (coupling transformer) including a primary winding 56 and a secondary winding 57 insulated from the primary winding 56; It has a switching element 58 connected to. Then, according to the turns ratio of the switching transformer 60, the switching element 58 is controlled to output DC15V (HV15V) and DC5V (HV5V).
  • 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 101 on the low voltage power supply 42 side, where the primary winding 56 is located, and the secondary winding by the switching transformer 60.
  • the wire 57 is insulated from the high voltage circuit 102 on the high voltage power supply 41 side.
  • the high voltage circuit 102 and low voltage circuit 101 of the inverter device 103 thus insulated are housed in the inverter accommodating portion 6 in close proximity to each other.
  • the noise of the high voltage circuit 102 can be reduced in the same way as in consumer equipment, but new resonance will occur, and as a result, the high voltage circuit 102 and the cup There was a problem in that the noise of the low voltage circuit 101 that was ringing was significantly worsened.
  • FIG. 8 shows the noise measurement results of the high voltage circuit 102, where the horizontal axis is the frequency and the vertical axis is the noise level.
  • L100 shows the case where the common mode coil is not inserted as shown in FIG. 6, and L101 shows the case where the common mode coil 104 is inserted as shown in FIG.
  • FIG. 8 shows the improvement difference: L100-L101.
  • FIG. 9 shows the noise measurement results of the low voltage circuit 101, where the horizontal axis is the frequency and the vertical axis is the noise level.
  • L103 shows the case where the common mode coil 104 is not inserted into the high voltage circuit 102 as shown in FIG. 6, and L104 shows the case where the common mode coil 104 is inserted into the high voltage circuit 102 as shown in FIG.
  • (b) in FIG. 9 shows the difference between them: L103-L104.
  • the impedance Due to the differential mode resonance between the leakage inductance of the common mode coil 104 and the inter-winding capacitance of the motor 8, the impedance has a minimum value near 6 MHz in FIG. 8, and an extremely large amount of common mode current in this band flows out. .
  • the noise flowing from the high voltage circuit 102 to the low voltage circuit 101 becomes extremely large, and as is clear from FIG. 9(b), the noise in the low voltage circuit 101 becomes significantly worse (FIG. 9(b)
  • a value smaller than 0 means that the noise is increasing).
  • the present invention has been made in order to solve the conventional technical problem, and effectively reduces noise caused by common mode current flowing from the motor and housing without worsening the noise of the low voltage circuit.
  • An object of the present invention is to provide an inverter device and an electric compressor equipped with the same.
  • the inverter device of the present invention includes a high-voltage circuit including a three-phase inverter circuit that is configured of switching elements and is supplied with power from a high-voltage power supply, and a low-voltage circuit that is supplied with power from a low-voltage power supply.
  • the motor is driven by a circuit, and is characterized by having a normal mode coil inserted into a three-phase output section of an inverter circuit.
  • the inverter device of the invention according to claim 2 is characterized in that, in the above invention, normal mode coils are inserted into any one phase, two phases, or all three phases of the three-phase output section of the inverter circuit.
  • the normal mode coil has a higher impedance at higher frequencies than at lower frequencies, and the three-phase output section of the inverter circuit further includes an impedance higher at higher frequencies than at lower frequencies. It is also characterized by the insertion of a common mode coil that provides high impedance at low frequencies.
  • a coil integrally provided with a common mode component corresponding to the common mode coil and a normal mode component corresponding to the normal mode coil is connected to a three-phase output section of the inverter circuit. It is characterized by what it did.
  • An electric compressor includes the inverter device of each of the above inventions, a housing in which the motor is housed, and an inverter accommodating portion configured in the housing, and the inverter device is housed in the inverter accommodating portion of the housing. It is characterized by being
  • the electric compressor of the invention according to claim 6 is characterized in that the housing in the above invention serves as a heat sink for the switching element.
  • the electric compressor of the invention of claim 7 is characterized in that it is mounted on a vehicle in the invention of claim 5.
  • the inverter circuit includes a high voltage circuit including a three-phase inverter circuit configured of switching elements and supplied with power from a high voltage power supply, and a low voltage circuit supplied with power from a low voltage power supply.
  • a high voltage circuit including a three-phase inverter circuit configured of switching elements and supplied with power from a high voltage power supply, and a low voltage circuit supplied with power from a low voltage power supply.
  • the inverter device is housed in the inverter accommodating portion of the housing, as in the invention of claim 6, the housing is used as a heat sink for the switching element, and as in the invention of claim 7, there is a demand for reduction in size and weight. This makes it extremely suitable for vehicle-mounted electric compressors.
  • the normal mode coil is effective when inserted into any one phase, two phases, or all three phases of the three-phase output section of the inverter circuit as in the second aspect of the invention.
  • the noise suppression effect described above can be obtained by simply inserting a normal mode coil into the three-phase output section of the inverter circuit, but if miniaturization is a priority, the normal mode coil can only reduce noise at high frequencies (several (MHz or higher) noise.
  • the inverter device can be improved. It becomes possible to effectively suppress noise over a wide band in both voltage circuits and low voltage circuits.
  • a coil integrally provided with a common mode component corresponding to a common mode coil and a normal mode component corresponding to a normal mode coil is connected to the three-phase output section of the inverter circuit. Therefore, it becomes possible to further reduce the size of the compressor, which is suitable for an electric compressor mounted on a vehicle as in the seventh aspect of the invention.
  • FIG. 1 is a block diagram of an electric circuit of an electric compressor according to an embodiment of the present invention (Embodiment 1); FIG. 1 is a schematic cross-sectional view of an electric compressor according to an embodiment of the present invention.
  • 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. 3 is a block diagram of an electric circuit of an electric compressor according to another embodiment to which the present invention is applied (Embodiment 2).
  • FIG. 2 is a block diagram of an electric circuit of a conventional electric compressor.
  • FIG. 7 is a block diagram of an electric circuit when a common mode coil is inserted into the output section of the inverter circuit of the electric compressor shown in FIG. 6.
  • FIG. 8 is a diagram illustrating noise in a high voltage circuit in the electric compressor of FIG. 7.
  • FIG. 8 is a diagram illustrating noise in a low voltage circuit in the electric compressor of FIG. 7.
  • the electric compressor 1 of the embodiment constitutes a part of a refrigerant circuit of a vehicle air conditioner installed in an electric vehicle such as a hybrid vehicle or an electric vehicle.
  • the inside of the metallic cylindrical housing 2 of the electric compressor 1 is divided into a compression mechanism housing part 4 and an inverter housing part by a partition wall 3 that intersects in the axial direction of the housing 2.
  • a scroll-type compression mechanism 7 and a motor 8 for driving the compression mechanism 7 are housed in the compression mechanism accommodating portion 4.
  • 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.
  • IPMSM Interior Permanent Magnet Synchronous Motor
  • 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 .
  • 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 .
  • the inverter device 16 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.
  • the control circuit 36 includes a control circuit 36, an HV connector, an LV connector, etc. (not shown).
  • 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.
  • IGBT insulated gate bipolar transistor
  • 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.
  • the substrate 17 is fixed to the partition wall 3 via the boss portion 24 that stands up from the partition wall 3.
  • 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.
  • 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.
  • inverter device 16 of the present invention includes an inverter circuit 34 for driving motor 8, a control circuit 36 for controlling this inverter circuit 34, and a high voltage circuit. It is composed of a filter (EMI filter) 37, a low voltage circuit filter (EMI filter) 38, a switching power supply device 39, etc., and these are wired on the board 17 mentioned above and housed in the inverter accommodating part 6 as mentioned above. Ru.
  • EMI filter filter
  • EMI filter low voltage circuit filter
  • the vehicle has a high voltage power source (HV power source) 41 consisting of, for example, a high voltage battery of approximately 300 V DC, for supplying power to the motor 8 of the electric compressor 1 and a driving motor (not shown), and a high voltage power source (HV power source) 41 of approximately 12 V DC.
  • HV power source high voltage power source
  • a low voltage power source (LV power source) 42 consisting of a battery is mounted, and the inverter device 16 is connected to the high voltage power source 41 through the aforementioned HV connector (not shown) and to the low voltage power source 42 through the LV connector.
  • the housing 2 is electrically connected to the vehicle body (ground).
  • 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.
  • CPU microprocessor
  • the high voltage circuit filter 37 is connected between the high voltage power supply 41 and the inverter circuit 34, and is composed of a common mode coil 43, Y capacitors 44 and 46, and a smoothing capacitor 47 in the embodiment.
  • This high voltage circuit filter 37 functions to reduce EMI noise generated by switching of the inverter circuit 34.
  • the low voltage circuit filter 38 includes an X capacitor 48, a common mode coil 49, Y capacitors 51 and 52, and a smoothing capacitor 53.
  • the low voltage circuit filter 38 is connected between the low voltage power supply 42 and the switching power supply device 39, and functions to reduce EMI noise generated by switching in the switching power supply device 39.
  • the switching power supply device 39 is a DC-DC converter that switches the low voltage power supply 42 (DC 12V) to generate a predetermined DC voltage (HV15V, HV5V) and supplies power to the control circuit 36.
  • HV15V is a voltage supplied to a gate driver (which the control circuit 36 has) that generates a gate drive signal for the inverter circuit 34
  • HV5V is a voltage that serves as a power source for the control circuit 36.
  • the switching power supply device 39 includes a switching transformer 60 including an isolation transformer (coupling transformer) including a primary winding 56 and a secondary winding 57 insulated from the primary winding 56; It has a switching element 58 connected to. Then, according to the turns ratio of the switching transformer 60, the switching element 58 is controlled to output DC15V (HV15V) and DC5V (HV5V).
  • a switching transformer 60 including an isolation transformer (coupling transformer) including a primary winding 56 and a secondary winding 57 insulated from the primary winding 56; It has a switching element 58 connected to. Then, according to the turns ratio of the switching transformer 60, the switching element 58 is controlled to output DC15V (HV15V) and DC5V (HV5V).
  • 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 56 is located, and the secondary winding by the switching transformer 60.
  • the wire 57 is insulated from the high voltage circuit 64 on the high voltage power supply 41 side.
  • 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.
  • 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, so 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.
  • a common mode current flows out (indicated by an arrow in FIG. 1).
  • noise common mode noise due to the common mode current flowing out through the stray capacitance 61 between the motor 8 and the housing 2 becomes dominant.
  • 62 in FIG. 7 is a stray capacitance between the inverter circuit 34 and the housing 2.
  • normal mode coils 66 are inserted into all three phases of the three-phase output section (three wires between the inverter circuit 34 and the motor 8) of the inverter circuit 34 (FIG. 1).
  • 66U is a normal mode coil inserted in the U phase line
  • 66V is a normal mode coil inserted in the V phase line
  • 66W is a normal mode coil inserted in the W phase line.
  • a mode coil 66 is configured.
  • the surge voltage (oscillating voltage) accompanying the switching of the switching elements 18 of each phase of the inverter circuit 34 is absorbed by the normal mode coil 66. This is converted into thermal energy as a loss, and its transmission to the motor 8 side is suppressed.
  • FIG. 3 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.
  • L100 indicates the case of FIG. 6 described above
  • L1 indicates the case where the normal mode coil 66 is inserted as shown in FIG.
  • (b) in FIG. 3 shows the improvement difference: L100-L1.
  • FIG. 3(b) by inserting the normal mode coil 66 into each phase between the three-phase output part of the inverter circuit 34 and the motor 8, the switching of the switching element 18 of each phase of the inverter circuit 34 is controlled.
  • the accompanying surge voltage (oscillating voltage) is converted into thermal energy as a loss by the normal mode coil 66, and its transmission to the motor 8 side is suppressed, causing a common mode current to flow out via the stray capacitance 61 between the motor 8 and the housing 2.
  • the noise (common mode noise) (indicated by black arrows in FIG. 1) is reduced.
  • FIG. 3(b) shows that the larger the value is than 0, the greater the noise reduction effect is, and it can be seen that the effect is particularly great in a frequency band higher than 6 MHz.
  • FIG. 4 shows the noise measurement results of the low voltage circuit 63 in FIG. 1, where the horizontal axis is the frequency and the vertical axis is the noise.
  • L103 indicates the case of FIG. 6 described above
  • L2 indicates the case where the normal mode coil 66 is inserted into the high voltage circuit 64 as shown in FIG.
  • (b) in FIG. 4 shows the difference between them: L103-L2.
  • the high voltage circuit 64 and the low voltage circuit 63 are housed in the inverter accommodating portion 6 of the housing 2, and a reduction in size and weight is required.
  • the noise suppression effect is extremely favorable.
  • an electric compressor 1 according to another embodiment of the present invention will be described with reference to FIG. 5.
  • components indicated by the same reference numerals as those in FIG. 1 have the same or similar functions.
  • the noise suppression effect can be obtained by simply inserting the normal mode coil 66 into the three-phase output section of the inverter circuit 34 of the inverter device 16, but if miniaturization of the electric compressor 1 is prioritized, the normal mode coil 66 can only reduce noise at a high frequency (6 MHz or higher) above a predetermined value (see FIG. 3).
  • the three-phase output section of the inverter circuit 34 has a small number of windings so that higher impedance can be obtained at lower frequencies than at higher frequencies.
  • a three-phase common mode coil 67 that is small and has low leakage inductance is inserted.
  • the common mode coil 67 which has a characteristic that the impedance is low at high frequencies and high at low frequencies, the low frequency ( It becomes possible to reduce noise at a frequency lower than a predetermined value (frequency band lower than 6 MHz), and it is possible to effectively suppress noise over a wide band in both the high voltage circuit 64 and the low voltage circuit 63. It becomes possible.
  • the compressor By connecting the compressor to the compressor, the compressor can be further miniaturized and is suitable for the electric compressor 1 mounted on a vehicle.
  • the normal mode coils 66 are inserted into all three phases of the three-phase output section of the inverter circuit 34, but the present invention is not limited to this.
  • a normal mode coil may be inserted, or it may be effective to insert it into two of these phases.
  • 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.
  • the present invention has been described using an inverter device that drives the motor of an electric compressor, but the inventions of claims 1 to 3 are not limited to this, and the invention is not limited to this, and the invention is not limited to this, and the motor is driven by providing a high voltage circuit and a low voltage circuit. It is applicable to various inverter devices. 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.

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  • Power Engineering (AREA)
  • Compressor (AREA)
  • Inverter Devices (AREA)

Abstract

[Problem] To provide an inverter device by which it is possible to effectively reduce noise resulting from a common mode current flowing from a motor and a housing, without worsening noise in a low voltage circuit. [Solution] An inverter device 16 comprises: a high voltage circuit 64 constituted of switching elements and including a three-phase inverter circuit 34 to which power is supplied from a high voltage source 41; and a low voltage circuit 63 to which power is supplied from a low voltage power source 42. The inverter device drives a motor 8 using the inverter circuit 34, and comprises normal mode coils 66 that are inserted into a three-phase output unit of the inverter circuit 34. The inverter device 16 is accommodated in an inverter accommodation unit 6 of a housing 2 of an electric compressor 1.

Description

インバータ装置及びそれを備えた電動圧縮機Inverter device and electric compressor equipped with it
　本発明は、モータを駆動するインバータ装置と、それを備えた電動圧縮機に関するものである。 The present invention relates to an inverter device that drives a motor, and an electric compressor equipped with the inverter device.
　ハイブリッド自動車や電気自動車等の電動車両の車室内を空調するための車両用空気調和装置では、エンジン駆動の圧縮機に代わってモータを備えた電動圧縮機が使用される。その場合、車両には例えばＤＣ３００Ｖ程の高電圧バッテリから成る高電圧電源と、ＤＣ１２Ｖ程の通常のバッテリから成る低電圧電源が搭載され、インバータ装置のインバータ回路により、高電圧電源の直流電圧を交流とした電圧が電動圧縮機のモータに供給される。 In a vehicle air conditioner for air conditioning the interior of an electric vehicle such as a hybrid vehicle or an electric vehicle, an electric compressor equipped with a motor is used instead of an engine-driven compressor. In that case, the vehicle is equipped with a high-voltage power source consisting of a high-voltage battery of about 300 VDC, for example, and a low-voltage power source consisting of a normal battery of about 12 VDC, and the inverter circuit of the inverter device converts the DC voltage of the high-voltage power source into alternating current. This voltage is supplied to the motor of the electric compressor.
　一方、インバータ装置のインバータ回路を制御する制御回路には、例えば低電圧電源の直流電圧をスイッチング電源装置により所定の電圧（例えばＤＣ１５Ｖ等）に変換して給電する。そのため、スイッチング電源装置には絶縁トランスから成るスイッチングトランスが設けられ、このスイッチングトランスの一次側の低電圧回路と、二次側の高電圧回路とを絶縁している。即ち、高電圧電源から電源が供給される高電圧回路と、低電圧電源から電源が供給される低電圧回路を備えたインバータ装置が、電動圧縮機のハウジングに構成されたインバータ収容部に収容されるかたちとされていた。 On the other hand, a control circuit that controls an inverter circuit of an inverter device is supplied with power by converting, for example, a DC voltage from a low-voltage power supply into a predetermined voltage (for example, DC 15V, etc.) using a switching power supply device. Therefore, a switching power supply device is provided with a switching transformer made of an isolation transformer, and a low voltage circuit on the primary side of the switching transformer is insulated from a high voltage circuit on the secondary side. That is, an inverter device including a high voltage circuit supplied with power from a high voltage power supply and a low voltage circuit supplied with power from a low voltage power supply is housed in an inverter accommodating portion configured in the housing of the electric compressor. It was considered to be a form.
　図６を用いて係る従来の電動圧縮機１００の電気回路を説明する。図６において１００は電動車両に搭載される車両用空気調和装置の冷媒回路を構成する従来の電動圧縮機であり、２はそのハウジングを示している。このハウジング２内に図示しない圧縮機構と、当該圧縮機構を駆動するモータ８が収容され、ハウジング２のインバータ収容部６にはモータ８を運転するためのインバータ回路３４、このインバータ回路３４を制御する制御回路３６、高電圧回路フィルタ（ＥＭＩフィルタ）３７、低電圧回路フィルタ（ＥＭＩフィルタ）３８、及び、スイッチング電源装置３９等を備えたインバータ装置１０３が収納される。 The electric circuit of the conventional electric compressor 100 will be explained using FIG. 6. In FIG. 6, 100 is a conventional electric compressor that constitutes a refrigerant circuit of a vehicle air conditioner mounted on an electric vehicle, and 2 indicates its housing. A compression mechanism (not shown) and a motor 8 for driving the compression mechanism are housed in the housing 2, and an inverter circuit 34 for driving the motor 8 and an inverter circuit 34 for controlling the inverter circuit 34 are housed in the inverter accommodating portion 6 of the housing 2. An inverter device 103 including a control circuit 36, a high voltage circuit filter (EMI filter) 37, a low voltage circuit filter (EMI filter) 38, a switching power supply device 39, and the like is housed.
　尚、車両には電動圧縮機１００のモータ８や、図示しない走行用のモータに給電して駆動するための例えばＤＣ３００Ｖ程の高電圧バッテリから成る高電圧電源（ＨＶ電源）４１と、ＤＣ１２Ｖ程のバッテリから成る低電圧電源（ＬＶ電源）４２が搭載されている。また、ハウジング２は車体（グランド）に導通されている。 The vehicle has a high voltage power source (HV power source) 41 consisting of, for example, a high voltage battery of about 300 V DC, for supplying power to the motor 8 of the electric compressor 100 and a driving motor (not shown), and a high voltage power source (HV power source) 41 of about 12 V DC. A low voltage power supply (LV power supply) 42 consisting of a battery is mounted. Furthermore, the housing 2 is electrically connected to the vehicle body (ground).
　インバータ装置１０３のインバータ回路３４は、三相ブリッジ接続されたＩＧＢＴ等から成る図示しない６個のスイッチング素子から構成されており、各スイッチング素子は制御回路３６が有するゲートドライバが生成するゲート駆動信号により制御される。また、各スイッチング素子はハウジング２と熱交換関係に配置され、スイッチング素子が発生する熱はハウジング２に放出され、スイッチング素子は冷却される構成とされている。即ち、ハウジング２が各スイッチング素子のヒートシンクとされている。 The inverter circuit 34 of the inverter device 103 is composed of six switching elements (not shown) including three-phase bridge-connected IGBTs, etc., and each switching element is driven by a gate drive signal generated by a gate driver included in the control circuit 36. controlled. Further, each switching element is arranged in a heat exchange relationship with the housing 2, and the heat generated by the switching element is released to the housing 2, so that the switching element is cooled. That is, the housing 2 serves as a heat sink for each switching element.
　制御回路３６はマイクロプロセッサ（ＣＰＵ）から構成されており、インバータ回路３４の各スイッチング素子をゲートドライバによりスイッチングしてＰＷＭ変調を行うことで、高電圧電源４１の直流電圧を所定周波数の交流電圧とし、モータ８に供給する。 The control circuit 36 is composed of a microprocessor (CPU), and converts the DC voltage of the high voltage power supply 41 into an AC voltage of a predetermined frequency by switching each switching element of the inverter circuit 34 with a gate driver and performing PWM modulation. , is supplied to the motor 8.
　高電圧回路フィルタ３７は高電圧電源４１とインバータ回路３４の間に接続されており、この例では、コモンモードコイル４３、Ｙコンデンサ４４、４６、平滑コンデンサ４７から構成される。この高電圧回路フィルタ３７は、インバータ回路３４のスイッチングにより発生するＥＭＩノイズを低減させる作用を奏する。低電圧回路フィルタ３８は、この例では、Ｘコンデンサ４８、コモンモードコイル４９、Ｙコンデンサ５１、５２、平滑コンデンサ５３から構成される。低電圧回路フィルタ３８は、低電圧電源４２とスイッチング電源装置３９の間に接続され、スイッチング電源装置３９でのスイッチングにより発生するＥＭＩノイズを低減させる作用を奏する。 The high-voltage circuit filter 37 is connected between the high-voltage power supply 41 and the inverter circuit 34, and is composed of a common mode coil 43, Y capacitors 44 and 46, and a smoothing capacitor 47 in this example. This high voltage circuit filter 37 functions to reduce EMI noise generated by switching of the inverter circuit 34. In this example, the low voltage circuit filter 38 includes an X capacitor 48, a common mode coil 49, Y capacitors 51 and 52, and a smoothing capacitor 53. The low voltage circuit filter 38 is connected between the low voltage power supply 42 and the switching power supply device 39, and functions to reduce EMI noise generated by switching in the switching power supply device 39.
　スイッチング電源装置３９は、低電圧電源４２（ＤＣ１２Ｖ）をスイッチングして所定の直流電圧（ＨＶ１５Ｖ、ＨＶ５Ｖ）を生成し、制御回路３６に給電するためのＤＣ－ＤＣコンバータである。尚、ＨＶ１５Ｖはインバータ回路３４のゲート駆動信号を生成するゲートドライバ（制御回路３６が有する）に供給される電圧であり、ＨＶ５Ｖは制御回路３６の電源となる電圧である。 The switching power supply device 39 is a DC-DC converter that switches the low voltage power supply 42 (DC 12V) to generate a predetermined DC voltage (HV15V, HV5V) and supplies power to the control circuit 36. Note that HV15V is a voltage supplied to a gate driver (which the control circuit 36 has) that generates a gate drive signal for the inverter circuit 34, and HV5V is a voltage that serves as a power source for the control circuit 36.
　スイッチング電源装置３９は、一次巻線５６と、この一次巻線５６とは絶縁された二次巻線５７から成る絶縁トランス（カップリングトランス）にて構成されたスイッチングトランス６０と、一次巻線５６に接続されたスイッチング素子５８を有している。そして、スイッチングトランス６０の巻数比に応じて、ＤＣ１５Ｖ（ＨＶ１５Ｖ）とＤＣ５Ｖ（ＨＶ５Ｖ）が出力されるようにスイッチング素子５８がスイッチング制御される。 The switching power supply device 39 includes a switching transformer 60 including an isolation transformer (coupling transformer) including a primary winding 56 and a secondary winding 57 insulated from the primary winding 56; It has a switching element 58 connected to. Then, according to the turns ratio of the switching transformer 60, the switching element 58 is controlled to output DC15V (HV15V) and DC5V (HV5V).
　スイッチング電源装置３９は低電圧電源４２をスイッチングして制御回路３６に電源を供給すると共に、スイッチングトランス６０により、一次巻線５６が位置する低電圧電源４２側の低電圧回路１０１と、二次巻線５７が位置する高電圧電源４１側の高電圧回路１０２とを絶縁する。そして、このように絶縁されたインバータ装置１０３の高電圧回路１０２と低電圧回路１０１が、インバータ収容部６内に近接して収容されることになる。 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 101 on the low voltage power supply 42 side, where the primary winding 56 is located, and the secondary winding by the switching transformer 60. The wire 57 is insulated from the high voltage circuit 102 on the high voltage power supply 41 side. The high voltage circuit 102 and low voltage circuit 101 of the inverter device 103 thus insulated are housed in the inverter accommodating portion 6 in close proximity to each other.
特開２００７－６８３１１号公報JP2007-68311A
　ここで、インバータ回路３４を構成するスイッチング素子のスイッチングに伴うサージ電圧（振動電圧）はモータ８側に伝達するため、電圧変動によりモータ８とハウジング２間の浮遊容量（図６に６１で示す）を介してコモンモード電流が流出する（図６中に矢印で示す）。特に、電動圧縮機１００では、モータ８とハウジング２間の浮遊容量６１を介して流出するコモンモード電流によるノイズ（コモンモードノイズ）が支配的となる。尚、図６中の６２はインバータ回路３４とハウジング２間の浮遊容量である。 Here, since the surge voltage (oscillating voltage) accompanying the switching of the switching elements constituting the inverter circuit 34 is transmitted to the motor 8 side, the stray capacitance between the motor 8 and the housing 2 (indicated by 61 in FIG. 6) due to voltage fluctuations. A common mode current flows out through (indicated by an arrow in FIG. 6). In particular, in the electric compressor 100, noise (common mode noise) due to a common mode current flowing out through the stray capacitance 61 between the motor 8 and the housing 2 becomes dominant. Note that 62 in FIG. 6 is a stray capacitance between the inverter circuit 34 and the housing 2.
　一方、従来より商用交流を電源とするエアコンや給湯器等の民生用機器においては、インバータ回路の出力部にコモンモードコイルやフェライトコアを挿入することにより、モータとハウジング間の浮遊容量を介して流出する経路のインピーダンスを高めてノイズの低減を図っていた（例えば、特許文献１参照）。 On the other hand, in consumer equipment such as air conditioners and water heaters that use commercial AC as a power source, by inserting a common mode coil or ferrite core into the output section of the inverter circuit, the power source is Noise has been reduced by increasing the impedance of the outflow path (for example, see Patent Document 1).
　しかしながら、図６のような電動車両に搭載される電動圧縮機１００のインバータ装置１０３では、小型軽量化（振動対策も含む）が必須事項であり、上述した民生用機器のようにインバータ回路３４の出力部にコモンモードコイルを入れる、或いは、フェライトコアを付ける等といった対策を施し難い実情がある。 However, in the inverter device 103 of the electric compressor 100 mounted on an electric vehicle as shown in FIG. In reality, it is difficult to take measures such as inserting a common mode coil into the output section or attaching a ferrite core.
　その上、前述した如くインバータ収容部６内で高電圧回路１０２と低電圧回路１０１が混在しているので、図７に示すように高電圧回路１０２にあるインバータ回路３４の出力部（インバータ回路３４とモータ８の間）に三相のコモンモードコイル１０４を挿入すると、民生用機器と同様に高電圧回路１０２のノイズ低減は図れるものの、新たな共振が発生し、結果として高電圧回路１０２とカップリングしている低電圧回路１０１のノイズが大幅に悪化してしまうと云う問題があった。 Furthermore, as described above, since the high voltage circuit 102 and the low voltage circuit 101 are mixed in the inverter accommodating section 6, as shown in FIG. If a three-phase common mode coil 104 is inserted between the high voltage circuit 102 and the motor 8), the noise of the high voltage circuit 102 can be reduced in the same way as in consumer equipment, but new resonance will occur, and as a result, the high voltage circuit 102 and the cup There was a problem in that the noise of the low voltage circuit 101 that was ringing was significantly worsened.
　即ち、図８中の（ａ）は高電圧回路１０２のノイズ測定結果を示し、横軸は周波数、縦軸はノイズレベルである。また、Ｌ１００は図６のようにコモンモードコイルを挿入していない場合、Ｌ１０１は図７のようにコモンモードコイル１０４を挿入した場合を示している。また、図８中の（ｂ）は、改善差違：Ｌ１００－Ｌ１０１を示している。 That is, (a) in FIG. 8 shows the noise measurement results of the high voltage circuit 102, where the horizontal axis is the frequency and the vertical axis is the noise level. Moreover, L100 shows the case where the common mode coil is not inserted as shown in FIG. 6, and L101 shows the case where the common mode coil 104 is inserted as shown in FIG. Further, (b) in FIG. 8 shows the improvement difference: L100-L101.
　図８（ｂ）から明らかな如く、インバータ回路３４の出力部とモータ８の間に三相のコモンモードコイル１０４を挿入したことにより、モータ８とハウジング２間の浮遊容量６１を介して流出するコモンモード電流（図７中に黒矢印で示す）によるノイズ（コモンモードノイズ）は低減される（図８（ｂ）は０より大きい程、ノイズ低減効果が大）。 As is clear from FIG. 8(b), by inserting the three-phase common mode coil 104 between the output part of the inverter circuit 34 and the motor 8, the outflow occurs via the stray capacitance 61 between the motor 8 and the housing 2. Noise (common mode noise) due to the common mode current (indicated by the black arrow in FIG. 7) is reduced (in FIG. 8(b), the larger the value is than 0, the greater the noise reduction effect).
　しかしながら、高電圧回路１０２にコモンモードコイル１０４を挿入したことにより、この経路のインピーダンスが高まり、ノイズを抑制して流出しないようにする作用が生じる。その結果、後述する共振よってコモンモード電流（ノイズエネルギー）が、図７中白抜き矢印や破線矢印で示すように低電圧回路１０１に流出し、低電圧回路１０１のノイズの悪化をもたらす。 However, by inserting the common mode coil 104 into the high-voltage circuit 102, the impedance of this path increases, producing the effect of suppressing noise and preventing it from leaking out. As a result, common mode current (noise energy) flows into the low voltage circuit 101 due to resonance, which will be described later, as shown by the white arrows and broken line arrows in FIG. 7, resulting in deterioration of noise in the low voltage circuit 101.
　図９中の（ａ）は低電圧回路１０１のノイズ測定結果を示し、横軸は周波数、縦軸はノイズレベルである。また、Ｌ１０３は図６のようにコモンモードコイルを高電圧回路１０２に挿入していない場合、Ｌ１０４は図７のようにコモンモードコイル１０４を高電圧回路１０２に挿入した場合を示している。また、図９中の（ｂ）は、それらの差違：Ｌ１０３－Ｌ１０４を示している。 (a) in FIG. 9 shows the noise measurement results of the low voltage circuit 101, where the horizontal axis is the frequency and the vertical axis is the noise level. Further, L103 shows the case where the common mode coil 104 is not inserted into the high voltage circuit 102 as shown in FIG. 6, and L104 shows the case where the common mode coil 104 is inserted into the high voltage circuit 102 as shown in FIG. Further, (b) in FIG. 9 shows the difference between them: L103-L104.
　コモンモードコイル１０４のリーケージインダクタンスとモータ８の巻線間容量とのディファレンシャルモード共振により、図８の６ＭＨｚ付近でインピーダンスは極小値を持ち、この帯域のコモンモード電流が極端に多く流出することになる。その結果、高電圧回路１０２から低電圧回路１０１に流出するノイズが極端に大きくなり、図９（ｂ）から明らかな如く、低電圧回路１０１のノイズが大幅に悪化する（図９（ｂ）は０より小さい程、ノイズが増大していることを意味する）。 Due to the differential mode resonance between the leakage inductance of the common mode coil 104 and the inter-winding capacitance of the motor 8, the impedance has a minimum value near 6 MHz in FIG. 8, and an extremely large amount of common mode current in this band flows out. . As a result, the noise flowing from the high voltage circuit 102 to the low voltage circuit 101 becomes extremely large, and as is clear from FIG. 9(b), the noise in the low voltage circuit 101 becomes significantly worse (FIG. 9(b) A value smaller than 0 means that the noise is increasing).
　本発明は、係る従来の技術的課題を解決するために成されたものであり、低電圧回路のノイズを悪化させること無く、モータ及びハウジングから流出するコモンモード電流によるノイズを効果的に低減することができるインバータ装置及びそれを備えた電動圧縮機を提供することを目的とする。 The present invention has been made in order to solve the conventional technical problem, and effectively reduces noise caused by common mode current flowing from the motor and housing without worsening the noise of the low voltage circuit. An object of the present invention is to provide an inverter device and an electric compressor equipped with the same.
　本発明のインバータ装置は、スイッチング素子より構成され、高電圧電源から電源が供給される三相のインバータ回路を含む高電圧回路と、低電圧電源から電源が供給される低電圧回路を備え、インバータ回路によりモータを駆動するものであって、インバータ回路の三相出力部に挿入されたノーマルモードコイルを備えたことを特徴とする。 The inverter device of the present invention includes a high-voltage circuit including a three-phase inverter circuit that is configured of switching elements and is supplied with power from a high-voltage power supply, and a low-voltage circuit that is supplied with power from a low-voltage power supply. The motor is driven by a circuit, and is characterized by having a normal mode coil inserted into a three-phase output section of an inverter circuit.
　請求項２の発明のインバータ装置は、上記発明においてインバータ回路の三相出力部の何れか一相、若しくは、二相、或いは、三相全てにノーマルモードコイルを挿入したことを特徴とする。 The inverter device of the invention according to claim 2 is characterized in that, in the above invention, normal mode coils are inserted into any one phase, two phases, or all three phases of the three-phase output section of the inverter circuit.
　請求項３の発明のインバータ装置は、請求項１の発明においてノーマルモードコイルは、低い周波数よりも高い周波数でインピーダンスが高くなるものであり、インバータ回路の三相出力部には更に、高い周波数よりも低い周波数で高いインピーダンスが得られるコモンモードコイルを挿入したことを特徴とする。 In the inverter device according to the invention of claim 3, in the invention of claim 1, the normal mode coil has a higher impedance at higher frequencies than at lower frequencies, and the three-phase output section of the inverter circuit further includes an impedance higher at higher frequencies than at lower frequencies. It is also characterized by the insertion of a common mode coil that provides high impedance at low frequencies.
　請求項４の発明のインバータ装置は、上記発明においてコモンモードコイルに相当するコモンモード成分と、ノーマルモードコイルに相当するノーマルモード成分を一体に備えたコイルを、インバータ回路の三相出力部に接続したことを特徴とする。 In the inverter device of the invention of claim 4, in the above invention, a coil integrally provided with a common mode component corresponding to the common mode coil and a normal mode component corresponding to the normal mode coil is connected to a three-phase output section of the inverter circuit. It is characterized by what it did.
　請求項５の発明の電動圧縮機は、上記各発明のインバータ装置と、モータが収容されるハウジングと、このハウジングに構成されたインバータ収容部を備え、インバータ装置が、ハウジングのインバータ収容部に収容されていることを特徴とする。 An electric compressor according to a fifth aspect of the present invention includes the inverter device of each of the above inventions, a housing in which the motor is housed, and an inverter accommodating portion configured in the housing, and the inverter device is housed in the inverter accommodating portion of the housing. It is characterized by being
　請求項６の発明の電動圧縮機は、上記発明においてハウジングが、スイッチング素子のヒートシンクとされていることを特徴とする。 The electric compressor of the invention according to claim 6 is characterized in that the housing in the above invention serves as a heat sink for the switching element.
　請求項７の発明の電動圧縮機は、請求項５の発明において車両に搭載されることを特徴とする。 The electric compressor of the invention of claim 7 is characterized in that it is mounted on a vehicle in the invention of claim 5.
　本発明によれば、スイッチング素子より構成され、高電圧電源から電源が供給される三相のインバータ回路を含む高電圧回路と、低電圧電源から電源が供給される低電圧回路を備え、インバータ回路によりモータを駆動するインバータ装置において、インバータ回路の三相出力部にノーマルモードコイルを挿入したので、インバータ回路の各相のスイッチング素子のスイッチングに伴うサージ電圧（振動電圧）は、ノーマルモードコイルにより損失として熱エネルギーに変換され、モータ側への伝達が抑制されることになる。 According to the present invention, the inverter circuit includes a high voltage circuit including a three-phase inverter circuit configured of switching elements and supplied with power from a high voltage power supply, and a low voltage circuit supplied with power from a low voltage power supply. In an inverter device that drives a motor with It is converted into thermal energy, and its transmission to the motor side is suppressed.
　これにより、ノーマルモードコイル以降の電圧変動率が低減され、モータとそれが収容されるハウジング間の浮遊容量を経由して流出するコモンモード電流を低減させ、高電圧回路におけるノイズ（コモンモードノイズ）を抑制することができるようになる。 This reduces the voltage fluctuation rate after the normal mode coil, reduces the common mode current flowing out via stray capacitance between the motor and the housing that houses it, and reduces noise in high voltage circuits (common mode noise). will be able to suppress.
　更に、ノーマルモードコイルにより電圧変動率が抑制されることで、低電圧回路に伝搬するノイズも抑制されると共に、コモンモードコイルを挿入する場合のような悪化もなく、結果として低電圧回路におけるノイズも効果的に抑制することができるようになる。これは請求項５の発明の如くインバータ装置がハウジングのインバータ収容部に収容されて、請求項６の発明の如くハウジングがスイッチング素子のヒートシンクとされ、請求項７の発明の如く小型軽量化が要求される車両搭載型の電動圧縮機において極めて好適なものとなる。 Furthermore, by suppressing the voltage fluctuation rate with the normal mode coil, noise propagating to the low voltage circuit is also suppressed, and there is no deterioration like when inserting a common mode coil, and as a result, noise in the low voltage circuit is suppressed. can also be effectively suppressed. This is because, as in the invention of claim 5, the inverter device is housed in the inverter accommodating portion of the housing, as in the invention of claim 6, the housing is used as a heat sink for the switching element, and as in the invention of claim 7, there is a demand for reduction in size and weight. This makes it extremely suitable for vehicle-mounted electric compressors.
　尚、ノーマルモードコイルは、請求項２の発明の如くインバータ回路の三相出力部の何れか一相、若しくは、二相、或いは、三相全てに挿入することで効果が出る。 Note that the normal mode coil is effective when inserted into any one phase, two phases, or all three phases of the three-phase output section of the inverter circuit as in the second aspect of the invention.
　ここで、インバータ回路の三相出力部にノーマルモードコイルを挿入するのみでも上記のようなノイズ抑制効果は得られるが、小型化を優先した場合、ノーマルモードコイルで低減できるのは高い周波数（数ＭＨｚ以上）のノイズに限られてしまう。 Here, the noise suppression effect described above can be obtained by simply inserting a normal mode coil into the three-phase output section of the inverter circuit, but if miniaturization is a priority, the normal mode coil can only reduce noise at high frequencies (several (MHz or higher) noise.
　そこで、請求項３の発明の如く、インバータ回路の三相出力部に更に、高い周波数よりも低い周波数で高いインピーダンスが得られる小型でリーケージインダクタンスが低いコモンモードコイルを挿入すれば、インバータ装置の高電圧回路と低電圧回路の双方において、広帯域に渡り、効果的にノイズの抑制を図ることが可能となる。 Therefore, as in the invention of claim 3, if a small common mode coil with low leakage inductance that can obtain higher impedance at lower frequencies than at higher frequencies is further inserted into the three-phase output section of the inverter circuit, the inverter device can be improved. It becomes possible to effectively suppress noise over a wide band in both voltage circuits and low voltage circuits.
　この場合、請求項４の発明の如くコモンモードコイルに相当するコモンモード成分と、ノーマルモードコイルに相当するノーマルモード成分を一体に備えたコイルをインバータ回路の三相出力部に接続するようにすれば、更なる小型化を図ることができるようになり、請求項７の発明の如き車両に搭載される電動圧縮機において好適なものとなる。 In this case, as in the invention of claim 4, a coil integrally provided with a common mode component corresponding to a common mode coil and a normal mode component corresponding to a normal mode coil is connected to the three-phase output section of the inverter circuit. Therefore, it becomes possible to further reduce the size of the compressor, which is suitable for an electric compressor mounted on a vehicle as in the seventh aspect of the invention.
本発明を適用した一実施例の電動圧縮機の電気回路のブロック図である（実施例１）。1 is a block diagram of an electric circuit of an electric compressor according to an embodiment of the present invention (Embodiment 1); FIG. 本発明の一実施例の電動圧縮機の概略断面図である。1 is a schematic cross-sectional view of an electric compressor according to an embodiment of the present invention. 図１の電動圧縮機における高電圧回路のノイズを説明する図である。2 is a diagram illustrating noise in a high voltage circuit in the electric compressor of FIG. 1. FIG. 図１の電動圧縮機における低電圧回路のノイズを説明する図である。2 is a diagram illustrating noise in a low voltage circuit in the electric compressor of FIG. 1. FIG. 本発明を適用した他の実施例の電動圧縮機の電気回路のブロック図である（実施例２）。FIG. 3 is a block diagram of an electric circuit of an electric compressor according to another embodiment to which the present invention is applied (Embodiment 2). 従来の電動圧縮機の電気回路のブロック図である。FIG. 2 is a block diagram of an electric circuit of a conventional electric compressor. 図６の電動圧縮機のインバータ回路の出力部にコモンモードコイルを挿入した場合の電気回路のブロック図である。FIG. 7 is a block diagram of an electric circuit when a common mode coil is inserted into the output section of the inverter circuit of the electric compressor shown in FIG. 6. FIG. 図７の電動圧縮機における高電圧回路のノイズを説明する図である。8 is a diagram illustrating noise in a high voltage circuit in the electric compressor of FIG. 7. FIG. 図７の電動圧縮機における低電圧回路のノイズを説明する図である。8 is a diagram illustrating noise in a low voltage circuit in the electric compressor of FIG. 7. FIG.
　以下、本発明の実施の形態について、図面に基づいて詳細に説明する。尚、下記の各図において、図６や図７と同一符号で示すものは同一若しくは同様の機能を奏するものとする。 Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In each of the figures below, the parts indicated by the same reference numerals as those in FIGS. 6 and 7 have the same or similar functions.
　先ず、図２を参照しながら本発明を適用した実施例の電動圧縮機（所謂インバータ一体型電動圧縮機）１について説明する。尚、実施例の電動圧縮機１は、ハイブリッド自動車や電気自動車等の電動車両に搭載される車両用空気調和装置の冷媒回路の一部を構成するものである。 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 installed in an electric vehicle such as a hybrid vehicle or an electric vehicle.
　（１）電動圧縮機１の構成
　図２において、電動圧縮機１の金属性の筒状ハウジング２内は、当該ハウジング２の軸方向に交差する仕切壁３により圧縮機構収容部４とインバータ収容部６とに区画されており、圧縮機構収容部４内に例えばスクロール型の圧縮機構７と、この圧縮機構７を駆動するモータ８が収容されている。 (1) Structure of the electric compressor 1 In FIG. 2, the inside of the metallic cylindrical housing 2 of the electric compressor 1 is divided into a compression mechanism housing part 4 and an inverter housing part by a partition wall 3 that intersects in the axial direction of the housing 2. For example, a scroll-type compression mechanism 7 and a motor 8 for driving the compression mechanism 7 are housed in the compression mechanism accommodating portion 4.
　この場合、実施例のモータ８はハウジング２に固定されたステータ９と、このステータ９の内側で回転するロータ１１から成るＩＰＭＳＭ（Ｉｎｔｅｒｉｏｒ　Ｐｅｒｍａｎｅｎｔ　Ｍａｇｎｅｔ　Ｓｙｎｃｈｒｏｎｏｕｓ　Ｍｏｔｏｒ）である。 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.
　仕切壁３の圧縮機構収容部４側の中心部には軸受部１２が形成されており、ロータ１１の駆動軸１３の一端はこの軸受部１２に支持され、駆動軸１３の他端は圧縮機構７に連結されている。ハウジング２の圧縮機構収容部４に対応する位置の仕切壁３近傍には吸入口１４が形成されており、モータ８のロータ１１（駆動軸１３）が回転して圧縮機構７が駆動されると、この吸入口１４からハウジング２の圧縮機構収容部４内に作動流体である低温の冷媒が流入し、圧縮機構７に吸引されて圧縮される。 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.
　そして、この圧縮機構７で圧縮され、高温・高圧となった冷媒は、図示しない吐出口よりハウジング２外の前記冷媒回路に吐出される構成とされている。また、吸入口１４から流入した低温の冷媒は、仕切壁３近傍を通ってモータ８の周囲を通過し、圧縮機構７に吸引されることから、仕切壁３も冷却されることになる。 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.
　そして、この仕切壁３で圧縮機構収容部４と区画されたインバータ収容部６内には、モータ８を駆動制御する本発明のインバータ装置１６が収容される。この場合、インバータ装置１６は、仕切壁３を貫通する密封端子やリード線を介してモータ８に給電する構成とされている。 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）インバータ装置１６の構造
　本発明の一実施例のインバータ装置１６は、基板１７と、この基板１７の一面側に配線された６個のスイッチング素子１８と、基板１７の他面側に配線された制御回路３６と、図示しないＨＶコネクタ、ＬＶコネクタ等から構成されている。各スイッチング素子１８は、実施例ではＭＯＳ構造をゲート部に組み込んだ絶縁ゲートバイポーラトランジスタ（ＩＧＢＴ）等から構成されている。 (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. The control circuit 36 includes a control circuit 36, 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) or the like in which a MOS structure is incorporated in the gate portion.
　この場合、各スイッチング素子１８が後述する三相のインバータ回路３４を構成するものであり、各スイッチング素子１８の端子部２２は、基板１７に接続されている。そして、このように組み立てられたインバータ装置１６は、各スイッチング素子１８がある一面側が仕切壁３側となった状態でインバータ収容部６内に収容されて仕切壁３に取り付けられ、カバー２３にて塞がれる。この場合、基板１７は仕切壁３から起立するボス部２４を介して仕切壁３に固定されることになる。 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 is fixed to the partition wall 3 via the boss portion 24 that stands up from the partition wall 3.
　このようにインバータ装置１６が仕切壁３に取り付けられた状態で、各スイッチング素子１８は仕切壁３に直接若しくは所定の絶縁熱伝導材を介して密着し、ハウジング２の仕切壁３と熱交換関係となる。そして、前述した如く仕切壁３は圧縮機構収容部４内に吸入される冷媒によって冷やされているので、各スイッチング素子１８Ａは仕切壁３を介して吸入冷媒と熱交換関係となり、仕切壁３の厚みを介して圧縮機構収容部４内に吸入された冷媒によって冷却され、各スイッチング素子１８自体は仕切壁３を介して冷媒に放熱するかたちとなる。即ち、ハウジング２（仕切壁３）が各スイッチング素子１８のヒートシンクとされている。 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）インバータ装置１６の回路構成
　次に、図１において本発明のインバータ装置１６は、モータ８を運転するためのインバータ回路３４と、このインバータ回路３４を制御する制御回路３６と、高電圧回路フィルタ（ＥＭＩフィルタ）３７と、低電圧回路フィルタ（ＥＭＩフィルタ）３８と、スイッチング電源装置３９等から構成され、これらが前述した基板１７上に配線され、前述した如くインバータ収容部６内に収納される。 (3) Circuit configuration of inverter device 16 Next, in FIG. 1, inverter device 16 of the present invention includes an inverter circuit 34 for driving motor 8, a control circuit 36 for controlling this inverter circuit 34, and a high voltage circuit. It is composed of a filter (EMI filter) 37, a low voltage circuit filter (EMI filter) 38, a switching power supply device 39, etc., and these are wired on the board 17 mentioned above and housed in the inverter accommodating part 6 as mentioned above. Ru.
　尚、車両には電動圧縮機１のモータ８や、図示しない走行用のモータに給電して駆動するための例えばＤＣ３００Ｖ程の高電圧バッテリから成る高電圧電源（ＨＶ電源）４１と、ＤＣ１２Ｖ程のバッテリから成る低電圧電源（ＬＶ電源）４２が搭載されており、インバータ装置１６は前述した図示しないＨＶコネクタにより高電圧電源４１に接続され、ＬＶコネクタにより低電圧電源４２に接続される。また、ハウジング２は車体（グランド）に導通されている。 The vehicle has a high voltage power source (HV power source) 41 consisting of, for example, a high voltage battery of approximately 300 V DC, for supplying power to the motor 8 of the electric compressor 1 and a driving motor (not shown), and a high voltage power source (HV power source) 41 of approximately 12 V DC. A low voltage power source (LV power source) 42 consisting of a battery is mounted, and the inverter device 16 is connected to the high voltage power source 41 through the aforementioned HV connector (not shown) and to the low voltage power source 42 through the LV connector. Furthermore, the housing 2 is electrically connected to the vehicle body (ground).
　インバータ回路３４は、三相ブリッジ接続の前述した６個のスイッチング素子１８から構成されており、各スイッチング素子１８は制御回路３６が有するゲートドライバが生成するゲート駆動信号により制御される。制御回路３６はマイクロプロセッサ（ＣＰＵ）から構成されており、インバータ回路３４の各スイッチング素子１８をゲートドライバによりスイッチングしてＰＷＭ変調を行うことで、高電圧電源４１の直流電圧を所定周波数の交流電圧とし、モータ８に供給する。 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.
　高電圧回路フィルタ３７は高電圧電源４１とインバータ回路３４の間に接続されており、実施例では、コモンモードコイル４３、Ｙコンデンサ４４、４６、平滑コンデンサ４７から構成される。この高電圧回路フィルタ３７は、インバータ回路３４のスイッチングにより発生するＥＭＩノイズを低減させる作用を奏する。低電圧回路フィルタ３８は、実施例では、Ｘコンデンサ４８、コモンモードコイル４９、Ｙコンデンサ５１、５２、平滑コンデンサ５３から構成される。低電圧回路フィルタ３８は、低電圧電源４２とスイッチング電源装置３９の間に接続され、スイッチング電源装置３９でのスイッチングにより発生するＥＭＩノイズを低減させる作用を奏する。 The high voltage circuit filter 37 is connected between the high voltage power supply 41 and the inverter circuit 34, and is composed of a common mode coil 43, Y capacitors 44 and 46, and a smoothing capacitor 47 in the embodiment. This high voltage circuit filter 37 functions to reduce EMI noise generated by switching of the inverter circuit 34. In the embodiment, the low voltage circuit filter 38 includes an X capacitor 48, a common mode coil 49, Y capacitors 51 and 52, and a smoothing capacitor 53. The low voltage circuit filter 38 is connected between the low voltage power supply 42 and the switching power supply device 39, and functions to reduce EMI noise generated by switching in the switching power supply device 39.
　スイッチング電源装置３９は、低電圧電源４２（ＤＣ１２Ｖ）をスイッチングして所定の直流電圧（ＨＶ１５Ｖ、ＨＶ５Ｖ）を生成し、制御回路３６に給電するためのＤＣ－ＤＣコンバータである。尚、ＨＶ１５Ｖはインバータ回路３４のゲート駆動信号を生成するゲートドライバ（制御回路３６が有する）に供給される電圧であり、ＨＶ５Ｖは制御回路３６の電源となる電圧である。 The switching power supply device 39 is a DC-DC converter that switches the low voltage power supply 42 (DC 12V) to generate a predetermined DC voltage (HV15V, HV5V) and supplies power to the control circuit 36. Note that HV15V is a voltage supplied to a gate driver (which the control circuit 36 has) that generates a gate drive signal for the inverter circuit 34, and HV5V is a voltage that serves as a power source for the control circuit 36.
　スイッチング電源装置３９は、一次巻線５６と、この一次巻線５６とは絶縁された二次巻線５７から成る絶縁トランス（カップリングトランス）にて構成されたスイッチングトランス６０と、一次巻線５６に接続されたスイッチング素子５８を有している。そして、スイッチングトランス６０の巻数比に応じて、ＤＣ１５Ｖ（ＨＶ１５Ｖ）とＤＣ５Ｖ（ＨＶ５Ｖ）が出力されるようにスイッチング素子５８がスイッチング制御される。 The switching power supply device 39 includes a switching transformer 60 including an isolation transformer (coupling transformer) including a primary winding 56 and a secondary winding 57 insulated from the primary winding 56; It has a switching element 58 connected to. Then, according to the turns ratio of the switching transformer 60, the switching element 58 is controlled to output DC15V (HV15V) and DC5V (HV5V).
　スイッチング電源装置３９は低電圧電源４２をスイッチングして制御回路３６に電源を供給すると共に、スイッチングトランス６０により、一次巻線５６が位置する低電圧電源４２側の低電圧回路６３と、二次巻線５７が位置する高電圧電源４１側の高電圧回路６４とを絶縁する。そして、インバータ装置１６は上記のように絶縁された高電圧回路６４と低電圧回路６３が基板１７上で近接した状態で構成され、インバータ収容部６内に収容されている。 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 56 is located, and the secondary winding by the switching transformer 60. The wire 57 is insulated from the high voltage circuit 64 on the high voltage power supply 41 side. 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.
　ここで、前述した如くインバータ回路３４を構成するスイッチング素子１８のスイッチングに伴うサージ電圧（振動電圧）はモータ８側に伝達するため、電圧変動によりモータ８とハウジング２間の浮遊容量６１を介してコモンモード電流が流出する（図１中に矢印で示す）。特に、実施例のような電動圧縮機１では、モータ８とハウジング２間の浮遊容量６１を介して流出するコモンモード電流によるノイズ（コモンモードノイズ）が支配的となる。尚、図７中の６２は同様にインバータ回路３４とハウジング２間の浮遊容量である。 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, so 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. A common mode current flows out (indicated by an arrow in FIG. 1). In particular, in the electric compressor 1 as in the embodiment, noise (common mode noise) due to the common mode current flowing out through the stray capacitance 61 between the motor 8 and the housing 2 becomes dominant. Note that 62 in FIG. 7 is a stray capacitance between the inverter circuit 34 and the housing 2.
　そこで、この実施例ではインバータ回路３４の三相出力部（インバータ回路３４とモータ８の間の三線）の三相全てにノーマルモードコイル６６をそれぞれ挿入している（図１）。尚、図１において、６６ＵはＵ相線に挿入されたノーマルモードコイル、６６ＶはＶ相線に挿入されたノーマルモードコイル、６６ＷはＷ相線に挿入されたノーマルモードコイルであり、これらでノーマルモードコイル６６が構成される。このように、インバータ回路３４の三相出力部にノーマルモードコイル６６を挿入したことにより、インバータ回路３４の各相のスイッチング素子１８のスイッチングに伴うサージ電圧（振動電圧）は、ノーマルモードコイル６６により損失として熱エネルギーに変換され、モータ８側への伝達が抑制されるようになる。 Therefore, in this embodiment, normal mode coils 66 are inserted into all three phases of the three-phase output section (three wires between the inverter circuit 34 and the motor 8) of the inverter circuit 34 (FIG. 1). In Fig. 1, 66U is a normal mode coil inserted in the U phase line, 66V is a normal mode coil inserted in the V phase line, and 66W is a normal mode coil inserted in the W phase line. A mode coil 66 is configured. As described above, by inserting the normal mode coil 66 into the three-phase output section of the inverter circuit 34, the surge voltage (oscillating voltage) accompanying the switching of the switching elements 18 of each phase of the inverter circuit 34 is absorbed by the normal mode coil 66. This is converted into thermal energy as a loss, and its transmission to the motor 8 side is suppressed.
　これにより、ノーマルモードコイル６６以降の電圧変動率が低減され、モータ８とハウジング２間の浮遊容量６１を経由して流出するコモンモード電流（図１に矢印で示す）を低減させ、高電圧回路６４におけるノイズ（コモンモードノイズ）を抑制することができるようになる。 As a result, the voltage fluctuation rate after the normal mode coil 66 is reduced, and the common mode current (indicated by the arrow in FIG. 1) flowing out via the stray capacitance 61 between the motor 8 and the housing 2 is reduced, and the high voltage circuit 64 (common mode noise) can be suppressed.
　更に、ノーマルモードコイル６６により電圧変動率が抑制されることで、低電圧回路６３に伝搬するノイズも抑制されると共に、図７の如くコモンモードコイルを挿入する場合のような悪化もなく、結果として低電圧回路６３におけるノイズも効果的に抑制することができるようになる。 Furthermore, since the voltage fluctuation rate is suppressed by the normal mode coil 66, noise propagating to the low voltage circuit 63 is also suppressed, and there is no deterioration as in the case of inserting a common mode coil as shown in FIG. As a result, noise in the low voltage circuit 63 can also be effectively suppressed.
　図３中の（ａ）は図１の高電圧回路６４のノイズ測定結果を示し、横軸は周波数、縦軸はノイズである。また、Ｌ１００は前述した図６の場合、Ｌ１は図１のようにノーマルモードコイル６６を挿入した場合を示している。また、図３中の（ｂ）は、改善差違：Ｌ１００－Ｌ１を示している。 (a) in FIG. 3 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. Further, L100 indicates the case of FIG. 6 described above, and L1 indicates the case where the normal mode coil 66 is inserted as shown in FIG. Further, (b) in FIG. 3 shows the improvement difference: L100-L1.
　図３（ｂ）から明らかな如く、インバータ回路３４の三相出力部とモータ８の間の各相にノーマルモードコイル６６を挿入したことにより、インバータ回路３４の各相のスイッチング素子１８のスイッチングに伴うサージ電圧（振動電圧）は、ノーマルモードコイル６６により損失として熱エネルギーに変換され、モータ８側への伝達が抑制され、モータ８とハウジング２間の浮遊容量６１を介して流出するコモンモード電流（図１中に黒矢印で示す）によるノイズ（コモンモードノイズ）は低減されている。図３（ｂ）は０より大きい程、ノイズ低減効果が大であることを示しており、特に、６ＭＨｚより高い周波数帯で効果が大であることが分かる。 As is clear from FIG. 3(b), by inserting the normal mode coil 66 into each phase between the three-phase output part of the inverter circuit 34 and the motor 8, the switching of the switching element 18 of each phase of the inverter circuit 34 is controlled. The accompanying surge voltage (oscillating voltage) is converted into thermal energy as a loss by the normal mode coil 66, and its transmission to the motor 8 side is suppressed, causing a common mode current to flow out via the stray capacitance 61 between the motor 8 and the housing 2. The noise (common mode noise) (indicated by black arrows in FIG. 1) is reduced. FIG. 3(b) shows that the larger the value is than 0, the greater the noise reduction effect is, and it can be seen that the effect is particularly great in a frequency band higher than 6 MHz.
　また、図４中の（ａ）は図１の低電圧回路６３のノイズ測定結果を示し、横軸は周波数、縦軸はノイズである。また、Ｌ１０３は前述した図６の場合、Ｌ２は図１のようにノーマルモードコイル６６を高電圧回路６４に挿入した場合を示している。また、図４中の（ｂ）は、それらの差違：Ｌ１０３－Ｌ２を示している。 Further, (a) in FIG. 4 shows the noise measurement results of the low voltage circuit 63 in FIG. 1, where the horizontal axis is the frequency and the vertical axis is the noise. Further, L103 indicates the case of FIG. 6 described above, and L2 indicates the case where the normal mode coil 66 is inserted into the high voltage circuit 64 as shown in FIG. Further, (b) in FIG. 4 shows the difference between them: L103-L2.
　図４中の（ｂ）から明らかな如く、ノーマルモードコイル６６により電圧変動率が抑制されることで、低電圧回路６３に伝搬するノイズも抑制されると共に、図７の如くコモンモードコイルを挿入する場合のような悪化もなく、結果として低電圧回路６３におけるノイズも効果的に抑制できている（図４中の（ｂ）は０より大きい程、ノイズ低減効果が大であることを示す）。 As is clear from (b) in FIG. 4, by suppressing the voltage fluctuation rate by the normal mode coil 66, the noise propagating to the low voltage circuit 63 is also suppressed, and the common mode coil is inserted as shown in FIG. As a result, the noise in the low voltage circuit 63 can be effectively suppressed ((b) in FIG. 4 indicates that the larger the value is than 0, the greater the noise reduction effect is). .
　特に、実施例のように車両搭載型の電動圧縮機１では、高電圧回路６４と低電圧回路６３がハウジング２のインバータ収容部６に収容され、小型軽量化が要求されるので、上記のようなノイズ抑制効果は極めて好適なものとなる。 In particular, in the vehicle-mounted electric compressor 1 as in the embodiment, the high voltage circuit 64 and the low voltage circuit 63 are housed in the inverter accommodating portion 6 of the housing 2, and a reduction in size and weight is required. The noise suppression effect is extremely favorable.
　次に、図５を参照しながら、本発明の他の実施例の電動圧縮機１について説明する。尚、図５において、図１と同一符号で示すものは同一若しくは同様の機能を奏するものとする。前述した如く、インバータ装置１６のインバータ回路３４の三相出力部に、ノーマルモードコイル６６を挿入するのみでもノイズ抑制効果は得られるが、電動圧縮機１の小型化を優先した場合、ノーマルモードコイル６６で低減できるのは所定値以上の高い周波数（６ＭＨｚ以上）のノイズに限られてしまう（図３参照）。 Next, an electric compressor 1 according to another embodiment of the present invention will be described with reference to FIG. 5. Note that in FIG. 5, components indicated by the same reference numerals as those in FIG. 1 have the same or similar functions. As mentioned above, the noise suppression effect can be obtained by simply inserting the normal mode coil 66 into the three-phase output section of the inverter circuit 34 of the inverter device 16, but if miniaturization of the electric compressor 1 is prioritized, the normal mode coil 66 can only reduce noise at a high frequency (6 MHz or higher) above a predetermined value (see FIG. 3).
　そこで、この実施例では図１の構成に加えて、図５に示す如くインバータ回路３４の三相出力部に更に、高い周波数よりも低い周波数で高いインピーダンスが得られるように、巻き回数が少なく、小型でリーケージインダクタンスが低い三相のコモンモードコイル６７を挿入している。このように、高い周波数ではインピーダンスが低く、低い周波数でインピーダンスが高くなる特性のコモンモードコイル６７を更に挿入することで、低電圧回路６３の悪化を回避しながら、高電圧回路６４における低い周波数（所定値より低い周波数：６ＭＨｚより低い周波数帯）でのノイズを低減することが可能となり、高電圧回路６４と低電圧回路６３の双方において、広帯域に渡り、効果的にノイズの抑制を図ることが可能となる。 Therefore, in this embodiment, in addition to the configuration of FIG. 1, as shown in FIG. 5, the three-phase output section of the inverter circuit 34 has a small number of windings so that higher impedance can be obtained at lower frequencies than at higher frequencies. A three-phase common mode coil 67 that is small and has low leakage inductance is inserted. In this way, by further inserting the common mode coil 67 which has a characteristic that the impedance is low at high frequencies and high at low frequencies, the low frequency ( It becomes possible to reduce noise at a frequency lower than a predetermined value (frequency band lower than 6 MHz), and it is possible to effectively suppress noise over a wide band in both the high voltage circuit 64 and the low voltage circuit 63. It becomes possible.
　この場合、図５に破線四角で示すようにコモンモードコイル６７に相当するコモンモード成分と、ノーマルモードコイル６６に相当するノーマルモード成分を一体に備えたコイル６８をインバータ回路３４の三相出力部に接続するようにすれば、更なる小型化を図ることができるようになり、車両に搭載される電動圧縮機１において好適なものとなる。 In this case, as shown by the broken line square in FIG. By connecting the compressor to the compressor, the compressor can be further miniaturized and is suitable for the electric compressor 1 mounted on a vehicle.
　尚、実施例ではインバータ回路３４の三相出力部の三相全てにノーマルモードコイル６６をそれぞれ挿入するようにしたが、それに限らず、三相出力部のＵＶＷ相のうちの何れか一相にノーマルモードコイルを挿入するようにしてもよく、それらのうちの二相に挿入するようにしても効果がある。 In the embodiment, the normal mode coils 66 are inserted into all three phases of the three-phase output section of the inverter circuit 34, but the present invention is not limited to this. A normal mode coil may be inserted, or it may be effective to insert it into two of these phases.
　また、実施例ではＤＣ３００Ｖ程の高電圧バッテリから成る高電圧電源４１と、ＤＣ１２Ｖ程のバッテリから成る低電圧電源４２を設け、この低電圧電源４２から高電圧回路６４側の直流電圧（ＨＶ１５Ｖ、ＨＶ５Ｖ）を生成する場合で説明したが、それに限らず、高電圧電源４１から直接高電圧回路６４側の直流電圧（ＨＶ１５Ｖ、ＨＶ５Ｖ）を生成するようにしてもよい。 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.
　また、実施例では電動圧縮機のモータを駆動するインバータ装置で本発明を説明したが、請求項１乃至請求項３の発明ではそれに限らず、高電圧回路と低電圧回路を備えてモータを駆動する種々のインバータ装置に適用可能である。更に、実施例で示した具体的な構成や数値はそれに限られるものでは無く、本発明の趣旨を逸脱しない範囲で種々変更可能である。 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 to 3 are not limited to this, and the invention is not limited to this, and the invention is not limited to this, and the motor is driven by providing a high voltage circuit and a low voltage circuit. It is applicable to various inverter devices. 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　電動圧縮機
　２　ハウジング
　３　仕切壁
　６　インバータ収容部
　８　モータ
　１６　インバータ装置
　１７　基板
　１８　スイッチング素子
　３４　インバータ回路
　３６　制御回路
　３７　高電圧回路フィルタ
　３８　低電圧回路フィルタ
　３９　スイッチング電源装置
　４１　高電圧電源
　４２　低電圧電源
　６３　低電圧回路
　６４　高電圧回路
　６６　ノーマルモードコイル
　６７　コモンモードコイル
　６８　コイル 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 37 High voltage circuit filter 38 Low voltage circuit filter 39 Switching power supply device 41 High voltage power supply 42 Low voltage Power supply 63 Low voltage circuit 64 High voltage circuit 66 Normal mode coil 67 Common mode coil 68 Coil

Claims (7)

  1. 　スイッチング素子より構成され、高電圧電源から電源が供給される三相のインバータ回路を含む高電圧回路と、低電圧電源から電源が供給される低電圧回路を備え、前記インバータ回路によりモータを駆動するインバータ装置において、
    　前記インバータ回路の三相出力部に挿入されたノーマルモードコイルを備えたことを特徴とするインバータ装置。     A high-voltage circuit including a three-phase inverter circuit that is composed of switching elements and is supplied with power from a high-voltage power supply, and a low-voltage circuit that is supplied with power from a low-voltage power supply, and the motor is driven by the inverter circuit. In the inverter device,
    An inverter device comprising a normal mode coil inserted into a three-phase output section of the inverter circuit.
  2. 　前記インバータ回路の三相出力部の何れか一相、若しくは、二相、或いは、三相全てにノーマルモードコイルを挿入したことを特徴とする請求項１に記載のインバータ装置。 The inverter device according to claim 1, wherein a normal mode coil is inserted into any one phase, two phases, or all three phases of the three-phase output section of the inverter circuit.
  3. 　前記ノーマルモードコイルは、低い周波数よりも高い周波数でインピーダンスが高くなるものであり、
    　前記インバータ回路の三相出力部には更に、高い周波数よりも低い周波数で高いインピーダンスが得られるコモンモードコイルを挿入したことを特徴とする請求項１に記載のインバータ装置。     The normal mode coil has higher impedance at higher frequencies than at lower frequencies,
    2. The inverter device according to claim 1, further comprising a common mode coil that provides higher impedance at lower frequencies than at higher frequencies.
  4. 　前記コモンモードコイルに相当するコモンモード成分と、前記ノーマルモードコイルに相当するノーマルモード成分を一体に備えたコイルを、前記インバータ回路の三相出力部に接続したことを特徴とする請求項３に記載のインバータ装置。 Claim 3, wherein a coil integrally provided with a common mode component corresponding to the common mode coil and a normal mode component corresponding to the normal mode coil is connected to a three-phase output section of the inverter circuit. The inverter device described.
  5. 　前記モータが収容されるハウジングと、該ハウジングに構成されたインバータ収容部を備え、
    　前記インバータ装置は、前記ハウジングのインバータ収容部に収容されていることを特徴とする請求項１乃至請求項４のうちの何れかに記載のインバータ装置を備えた電動圧縮機。     comprising a housing in which the motor is housed, and an inverter housing configured in the housing,
    The electric compressor equipped with an inverter device according to any one of claims 1 to 4, wherein the inverter device is housed in an inverter accommodating portion of the housing.
  6. 　前記ハウジングが、前記スイッチング素子のヒートシンクとされていることを特徴とする請求項５に記載の電動圧縮機。 The electric compressor according to claim 5, wherein the housing serves as a heat sink for the switching element.
  7. 　車両に搭載されることを特徴とする請求項５に記載の電動圧縮機。 The electric compressor according to claim 5, wherein the electric compressor is mounted on a vehicle.
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JP2009171841A (en) * 2009-03-16 2009-07-30 Hitachi Ltd Electric motor system
JP2017022961A (en) * 2015-07-07 2017-01-26 株式会社豊田自動織機 On-vehicle inverter device and on-vehicle air conditioner
JP2022051274A (en) * 2020-09-18 2022-03-31 サンデン・オートモーティブコンポーネント株式会社 Motor-driven compressor
JP2022061801A (en) * 2020-10-07 2022-04-19 株式会社アイシン Vehicle driving system

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