WO2023140208A1 - Active filter device and electric compressor provided with same - Google Patents

Active filter device and electric compressor provided with same Download PDF

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Publication number
WO2023140208A1
WO2023140208A1 PCT/JP2023/000935 JP2023000935W WO2023140208A1 WO 2023140208 A1 WO2023140208 A1 WO 2023140208A1 JP 2023000935 W JP2023000935 W JP 2023000935W WO 2023140208 A1 WO2023140208 A1 WO 2023140208A1
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Prior art keywords
common mode
capacitors
inverting amplifier
circuit
active filter
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PCT/JP2023/000935
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French (fr)
Japanese (ja)
Inventor
浩 吉田
孝次 小林
辰樹 柏原
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サンデン株式会社
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Publication of WO2023140208A1 publication Critical patent/WO2023140208A1/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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/04—Frequency selective two-port networks

Definitions

  • the present invention relates to an active filter device for suppressing common mode noise and an electric compressor equipped with the active filter device.
  • a passive common mode noise filter (passive filter) aimed at reducing common mode noise consisted of a Y capacitor connected between a pair of power supply lines and ground potential, and a common mode choke coil inserted into the pair of power supply lines (see, for example, Patent Document 1).
  • JP 2008-78844 A Japanese Patent No. 3044650 Japanese Patent No. 2863833 Japanese Patent No. 5528543
  • a common mode transformer is required to detect and compensate for common mode noise, which entails an increase in the size of the active filter device, so improvements have been desired.
  • it is possible to reduce the common mode noise impedance by increasing the capacitance value of the Y capacitor there is also the problem that the resonance frequency with the parasitic inductance decreases as the capacitance value of the Y capacitor increases, resulting in a decrease in noise reduction performance in the high frequency region.
  • the present invention has been made to solve such conventional technical problems, and aims to provide an active filter device that can improve the attenuation characteristics of a common mode noise filter in a high frequency range without using a common mode transformer and without increasing the volume or weight of a passive common mode noise filter, and an electric compressor equipped with the same.
  • the active filter device of the present invention comprises a plurality of sets of Y capacitors each having one end connected to a pair of power supply lines, a common mode choke coil inserted in the pair of power supply lines, a detection unit for detecting a common mode voltage, and a plurality of inversion amplifier circuits provided corresponding to each set of the Y capacitors for inverting and amplifying the common mode voltage detected by the detection unit.
  • the output voltage of the inverting amplifier circuit is applied to each pair of Y capacitors as a compensation voltage.
  • the active filter device of the invention of claim 2 is characterized in that the common mode voltage detected by a single detection unit composed of a pair of common mode voltage detection capacitors in the above invention is input to each inverting amplifier circuit.
  • the active filter device of the invention of claim 3 is characterized in that a detection unit is provided for each inverting amplifier circuit.
  • the active filter device of the invention of claim 4 is characterized in that the ground path of the detection section and the ground path of the inverting amplifier circuit are separately connected to the circuit ground.
  • the electric compressor of the invention of claim 5 is characterized in that the active filter device and the inverter device of each of the above inventions are provided integrally with a housing.
  • the electric compressor of the invention of claim 6 is characterized in that, in the above invention, the housing is set to ground potential, the circuit ground is connected to the housing, the ground path of the detection unit is connected to the housing, and the ground path of the inverting amplifier circuit is connected to the circuit ground.
  • a plurality of sets of Y capacitors each having one end connected to a pair of power supply lines, a common mode choke coil inserted into the pair of power supply lines, a detection unit for detecting a common mode voltage, and a plurality of inverting amplifier circuits provided corresponding to each set of the Y capacitors for inverting and amplifying the common mode voltage detected by the detection unit.
  • the output voltage of each inverting amplifier circuit is applied to each set of Y capacitors as a compensation voltage, the apparent capacitance value of each set of Y capacitors increases according to the gain of each inverting amplifier circuit.
  • a plurality of sets of Y capacitors and a plurality of inverting amplifier circuits corresponding thereto are provided, the capacitance value of each Y capacitor is set to a different value for each set, the output of each inverting amplifier circuit is connected to the other end of each set of Y capacitors, and the output voltage of each inverting amplifier circuit is applied to each set of Y capacitors as a compensation voltage. Further, by individually selecting the gain value of each inverting amplifier circuit according to the purpose of use, the frequency characteristics of common mode impedance can be adjusted in accordance with the characteristics of EMI noise.
  • the common mode voltage detected by a single detection section composed of a pair of common mode voltage detection capacitors is configured to be input to each inverting amplifier circuit, thereby simplifying the circuit configuration of the detection section.
  • the active filter device of each of the above inventions is extremely suitable when it is integrally provided with the housing of the electric compressor together with the inverter device as in the fifth aspect of the invention.
  • FIG. 1 is an electric circuit diagram of an electric compressor of one embodiment to which an active filter device of the present invention is applied and a feed path to the electric compressor;
  • FIG. FIG. 2 is an electric circuit diagram of the electric compressor of FIG. 1 (Example 1).
  • 3 is an equivalent circuit diagram of the active filter device of FIG. 2;
  • FIG. FIG. 5 is a diagram showing impedance characteristics of a Y capacitor for explaining the common mode noise reduction effect of the active filter device of the present invention;
  • FIG. 10 is a diagram showing another embodiment of the electric circuit of the electric compressor of FIG. 1 and a power supply path to the electric compressor (Embodiment 2);
  • 3 is a diagram showing another example of the electric circuit of the electric compressor of FIG. 2 (Example 3);
  • FIG. 1 shows an electric circuit diagram of an electric compressor 2 and a power feeding path to the electric compressor 2 of one embodiment to which the active filter device 1 of the present invention is applied
  • FIG. 2 shows an electric circuit diagram of the electric compressor 2.
  • the electric compressor 2 of the embodiment constitutes a part of the refrigerant circuit of a vehicle air conditioner that is mounted in a vehicle such as an electric vehicle or a hybrid vehicle and air-conditions the interior of the vehicle. That is, the electric compressor 2 of the embodiment is an inverter-integrated electric compressor.
  • the inverter device 3 converts a DC voltage from a high-voltage battery 7 (HV, for example, 350 V DC) mounted on the vehicle as a DC power source into an AC voltage of an arbitrary frequency and supplies it to the motor 8 of the electric compressor 2 for operation.
  • the active filter device 1 of the embodiment of the present invention is provided to reduce common mode noise generated in the inverter device 3.
  • the inverter device 3 is composed of a plurality of switching elements (IGBT) 15 connected to a positive power supply line 11 of the high voltage battery 7 and a negative power supply line 12.
  • IGBT switching elements
  • Reference numeral 20 in FIG. 1 denotes a control circuit, and each switching element 15 of the inverter device 3 is switching-controlled (PWM-controlled) by this control circuit 20 .
  • a smoothing capacitor 13 is connected between the pair of power supply lines 11 and 12 .
  • 14 is an ECU of the vehicle
  • 16 is a low voltage battery (DC 12V)
  • the control circuit 20 controls the switching of each switching element 15 of the inverter device 3 using the low voltage battery 16 as a power source based on a command from the ECU 14.
  • Reference numeral 18 denotes a housing (made of aluminum die-casting) of the electric compressor 2 .
  • the electric compressor 2 is connected to the high voltage battery 7 by a shielded HV harness 25 (constituting a pair of power supply lines 11 and 12), and the housing 18 of the electric compressor 2 is directly fixed to the vehicle body. As a result, the housing 18 becomes the ground potential.
  • the active filter device 1 of the embodiment includes a first set of Y capacitors (C Y1 ) 21, 22 (first Y capacitors) and a second set of Y capacitors (C Y2 ) 41, 42 (second Y capacitors), an active filter compensation circuit 23 connected between the two sets of Y capacitors 21, 22, 41, 42 and the housing 18 (ground potential), and a pair of common mode voltage detection capacitors 26, 27 (C sense : constituting the detection unit 29 in the present invention), the Y capacitors 21, 22, 41, 42, the active filter compensation circuit 23, and the common mode choke coil (CMCC) 28 inserted in the pair of power supply lines 11, 12 on the high voltage battery 7 side when viewed from the common mode voltage detection capacitors 26, 27.
  • C sense constituting the detection unit 29 in the present invention
  • FIG. 2 extracts and shows only the electric circuit of the electric compressor 2 .
  • the same reference numerals as in FIG. 1 denote the same components. Insulating paper, coolant, and oil are interposed between the windings 8C of the motor 8 and the housing 18, and the stray capacitance between the windings 8C of the motor 8 and the housing 18 is indicated by 31 in FIG. A noise current flows through this stray capacitance 31 to generate common mode noise.
  • FIG. 2 shows details of the active filter compensating circuit 23 of the active filter device 1. As shown in FIG. ⁇ 23 ⁇ 32 ⁇ 52 ⁇ 32 ⁇ 52 ⁇ (-) ⁇ (R f _ com1 )33 ⁇ (R f _ com2 )53 ⁇ 32 ⁇ 52 ⁇ (V CC ⁇ V EE )34 ⁇ 26 ⁇ 27 ⁇ 26 ⁇ 27 ⁇ 29 ⁇ (R sense1 )36 ⁇ (R sense2 )56 ⁇
  • the amplifier 32, the negative feedback resistor 33, and the common mode voltage detection resistor 36 constitute a first inverting amplifier circuit 37 (first inverting amplifier circuit: gain G 1 ) in the present invention.
  • the amplifier 52, the negative feedback resistor 53, and the common mode voltage detection resistor 56 constitute a second inverting amplifier circuit 57 (second inverting amplifier circuit: gain G 2 ) of the present invention.
  • One ends of the common mode voltage detection capacitors 26 and 27 are connected to the pair of power supply lines 11 and 12, respectively, and the common other ends of the common mode voltage detection capacitors 26 and 27 are connected to one ends of common mode voltage detection resistors 36 and 56, respectively.
  • the other end of the common mode voltage detection resistor 36 is connected to the inverting input terminal (-) of the amplifier 32, and the other end of the common mode voltage detection resistor 56 is connected to the inverting input terminal (-) of the amplifier 52.
  • the non-inverting input terminals (+) of amplifiers 32 and 52 are also connected to circuit ground 30 in this embodiment by ground paths 38 and 58, respectively.
  • the ground paths 38 and 58 serve as ground paths for the detection section 29 .
  • the circuit ground 30 is connected to the housing 18, which is at ground potential.
  • one ends of the Y capacitors 21 and 22 described above are connected to the pair of power supply lines 11 and 12, respectively, and one ends of the Y capacitors 41 and 42 are also connected to the pair of power supply lines 11 and 12, respectively.
  • the other ends of the Y capacitors 21 and 22 are both connected to the output terminal of the amplifier 32 (the first output of the active filter compensation circuit 23), and the other ends of the Y capacitors 41 and 42 are both connected to the output terminal of the amplifier 52 (the second output of the active filter compensation circuit 23).
  • the ground path 39 of the power supply circuit 34 of the amplifiers 32, 52 is connected to the circuit ground 30 separately from the ground paths 38, 58 in this embodiment.
  • This ground path 39 is the ground path of the inverting amplifier circuits 37 and 57 .
  • the Y capacitors 21, 22 are connected between the pair of power supply lines 11, 12 and the housing 18 (ground potential) through the amplifier 32 of the active filter compensation circuit 23
  • the Y capacitors 41, 42 are connected between the pair of power supply lines 11, 12 and the housing 18 (ground potential) through the amplifier 52 of the active filter compensation circuit 23
  • the output voltage of the inverting amplifier circuit 37 is applied to the Y capacitors 21, 22 as a compensation voltage.
  • the output voltage of the inverting amplifier circuit 57 (amplifier 52) is applied to the Y capacitors 41 and 42 as a compensation voltage.
  • FIG. 3 shows an equivalent circuit of the active filter device 1.
  • elements related to the inverting amplifier circuit 37 are denoted by reference numerals, but the same applies to the other inverting amplifier circuit 57 as well.
  • the Y capacitors 21 and 22 are replaced with the Y capacitors 41 and 42
  • the amplifier 37 is replaced with the amplifier 57
  • the negative feedback resistor 33 is replaced with the negative feedback resistor 53
  • the common mode voltage detection resistor 36 is replaced with the common mode resistance detection resistor 56.
  • the parasitic inductance 51 As for the parasitic inductance 51 described below, it is assumed that the parasitic inductances of different inductance values are placed in the same positions in FIG. That is, in an actual circuit, the Y capacitors 21 and 22 have a parasitic inductance 51 (L stray — Cy ) (the Y capacitors 21 and 22 actually have an inductance value L stray — Cy1 which will be described later).
  • the common mode voltage (HV common mode voltage) appearing on the power supply lines 11 and 12 is represented by v HV_com
  • the compensation voltage of the inverting amplifier circuit 37 is represented by v comp _ com .
  • R sense is the resistance value of the common mode voltage detection resistor, and in the case of the common mode voltage detection resistor 36, R sense1 is substituted (same below).
  • C sense is the capacitance value of the common mode voltage detection capacitors 26 and 27, and C sense ( ⁇ 2) means their combined capacitance value.
  • This R f — com is the resistance value of the negative feedback resistor, and in the case of the negative feedback resistor 33, R f — com1 is substituted.
  • L stray — Cy is the inductance value of the parasitic inductance 51
  • L stray — Cy ( ⁇ 1/2) means their combined inductance value
  • C Y means the capacitance value of the Y capacitor
  • C Y ( ⁇ 2) means the combined capacitance value thereof.
  • I CY is the current flowing through the Y capacitor
  • the current flowing through Y capacitors 21 and 22 is I CY1 .
  • the impedance Z Cy is given by the following formula (III).
  • the impedance Z Cy is represented by the combined capacitance value C sense ( ⁇ 2) of the common mode voltage detection capacitors 26 and 27, the resistance value R sense of the common mode voltage detection resistor, the combined capacitance value C Y ( ⁇ 2) of the Y capacitor, and the inductance value L stray — Cy of the parasitic inductance 51, resulting in the following formula (IV).
  • the capacitance value C sense of the common mode voltage detection capacitors 26 and 27 and the resistance value R sense of the common mode voltage detection resistor are selected such that the impedance of the common mode voltage detection capacitors 26 and 27 can be ignored with respect to the impedance of the common mode voltage detection resistor.
  • the capacitance value C Y1 of the Y capacitors 21 and 22 is set to a value different from the capacitance value C Y2 of the Y capacitors 41 and 42 .
  • the capacitance value C Y2 of the Y capacitors 41 and 42 is selected to be 1/10 of the capacitance value C Y1 of the Y capacitors 21 and 22 .
  • the impedance Z Cy1 of the Y capacitors 21 and 22 is given by the following formula (VI) from the formula (V), and the impedance Z Cy2 of the Y capacitors 41 and 42 is given by the following formula (VII).
  • the inductance value of the parasitic inductance of the Y capacitors 21 and 22 is indicated by L stray_Cy1
  • the gain of the inverting amplifier circuit 37 is indicated by G1
  • the inductance value of the parasitic inductance of the Y capacitors 41 and 42 is indicated by L stray_Cy2
  • the gain of the inverting amplifier circuit 57 is indicated by G2 .
  • the above formula (VI) means that it is equivalent to (1+G 1 ) times the Y capacitor being connected, and the above formula (VII) means that it is equivalent to (1+G 2 ) times the Y capacitor being connected. That is, the compensation by the active filter compensation circuit 23 apparently increases the capacitance values of the Y capacitors 21 and 22 by (1+G 1 ) times, and apparently increases the capacitance values of the Y capacitors 41 and 42 by (1+G 2 ) times.
  • the inductance value of the parasitic inductance 51 is equivalently reduced (1/(1+G 1 ), 1/(1+G 2 )).
  • the inverting amplifier circuits 37 and 57 for inverting and amplifying the common mode voltage v HV_com detected by the detection unit 29 are provided, and the output voltages of the inverting amplifier circuits 37 and 57 are applied as compensation voltages v comp _ com1 and v comp _ com2 to the Y capacitors 21 and 22 and the Y capacitors 41 and 42 , respectively. (1+G 1 ) times), and the apparent capacitance values of the Y capacitors 41 and 42 increase ((1+G 2 ) times ) according to the gain G 2 of the inverting amplifier circuit 57 .
  • the coarse dashed line in FIG. 4 indicates the impedance characteristic of the Y capacitor (capacitance value C Y1 ) of the ordinary passive noise filter, the finest broken line indicates the impedance characteristic of only the Y capacitors 21 and 22 (capacitance value C Y1 ) of the active filter device 1, and the middle broken line indicates the impedance characteristic of only the Y capacitors 41 and 42 (capacitance value C Y2 ) of the active filter device 1.
  • a solid line indicates impedance characteristics of parallel connection of the Y capacitors 21 and 22 (capacitance value C Y1 ) and the Y capacitors 41 and 42 (capacitance value C Y2 ) in the active filter device 1 of the present invention.
  • Z Cy is the impedance of the Y capacitor.
  • the capacitance values of the Y capacitors 21 and 22 apparently increase, and the impedance Z Cy decreases in accordance with the value of the gain G 1 as compared to a normal passive noise filter (the finest broken line in FIG. 4).
  • the inductance component becomes dominant at frequencies higher than the resonance frequency due to resonance with the parasitic inductance of the Y capacitors 21 and 22, so the impedance Z Cy rises in the high frequency region as indicated by the finest broken line in the figure.
  • the present invention it is possible to suppress an increase in common mode noise impedance in a high frequency region caused by the resonance frequency of the Y capacitor, and to more effectively improve the attenuation characteristics of common mode noise.
  • the gain values (G 1 , G 2 ) of the inverting amplifier circuits 37, 57 are individually selected according to the purpose of use. As a result, according to the present invention, the frequency characteristics of common mode impedance can be adjusted in accordance with the characteristics of EMI noise.
  • the active filter compensation circuit 23 can be added to a normal passive type noise filter consisting of a common mode choke coil and a Y capacitor to improve the attenuation characteristics of common mode noise, so it is highly versatile.
  • the common mode voltage v HV_com detected by the single detection section 29 composed of the pair of common mode voltage detection capacitors 26 and 27 is input to the inverting amplifier circuits 37 and 57, so that the circuit configuration of the detection section 29 can be simplified.
  • the active filter device 1 of the present invention is extremely suitable when it is provided integrally with the housing 18 of the electric compressor 2 together with the inverter device 3 as in the embodiment.
  • the ground paths 38 and 58 of the detection section 29 and the ground path 39 of the inverting amplifier circuits 37 and 57 are separately connected to the circuit ground 30, so that it is possible to reduce the adverse effect of the voltage fluctuation on the circuit ground 30 caused by the operating currents of the inverting amplifier circuits 37 and 57 on the detection of the common mode voltage by the detection section 29.
  • FIG. 5 shows an electric circuit diagram of an electric compressor 2 and a feed path to the electric compressor 2 of another embodiment of the present invention.
  • the same reference numerals as in FIG. 1 have the same or similar functions.
  • the inverting amplifier circuit 37 and the inverting amplifier circuit 57 of the active filter compensating circuit 23 are provided with detectors (denoted by reference numerals 29A and 29B), respectively.
  • the detection section 29A for the inverting amplifier circuit 37 is composed of the first common mode voltage detection capacitors 26A and 27A (C sense1 ) whose one ends are connected to the power supply lines 11 and 12, respectively, and the common mode voltage detection resistor 36 (FIG. 2) connected to the other ends thereof. (C sense2 ) and the common mode voltage sensing resistors 56 (FIG. 2) respectively connected to their other ends.
  • the detection units 29A and 29B are provided for the inverting amplifier circuit 37 and the inverting amplifier circuit 57, respectively, there is an advantage that common mode noise voltage detection characteristics corresponding to the frequency characteristics of the respective inverting amplifier circuits 37 and 57 can be obtained.
  • FIG. 6 shows an electric circuit of another embodiment of the electric compressor 2 of the present invention. 1 and 2 are denoted by the same reference numerals as in FIG. 1 and FIG.
  • the ground paths 38, 58 of the detector 29 are directly connected to the housing 18 (ground potential), and the ground paths 39 of the power supply circuits 34 of the amplifiers 32, 52 (ground paths of the inverting amplifier circuits 37, 57) are connected to the circuit ground 30 in the same manner as described above.
  • two sets of Y capacitors (21, 22, 41, 42) are connected, and an inverting amplifier circuit (37, 57) is provided for each set of Y capacitors.
  • an inverting amplifier circuit (37, 57) is provided for each set of Y capacitors.
  • more sets of Y capacitors may be connected, the capacitance value of the Y capacitors may be different for each set, and more inverting amplifier circuits may be provided for each set of Y capacitors.
  • the active filter device 1 of the present invention is applied to the electric compressor 2 that constitutes the refrigerant circuit of the vehicle air conditioner, but the invention of claims 1 to 4 is not limited to this, and the present invention is effective for various household/commercial equipment that requires reduction of common mode noise.
  • Active Filter Device 2 Electric Compressor 3 Inverter Device 4 Inverter Housing 7 High Voltage Battery (DC Power Supply) 8 motor 11, 12 power supply line 15 switching element 18 housing 20 control circuit 21, 22, 41, 42 Y capacitor 23 active filter compensation circuit 26, 27, 26A, 27A, 26B, 27B common mode voltage detection capacitor 28 common mode choke coil 29, 29A, 29B detector 30 circuit ground 32, 52 amplifier (operational amplifier unit, Or an operational amplifier with a current amplifier at the output) 36, 56 common mode voltage detection resistor 37, 57 inverting amplifier circuit 38, 39, 58 ground path

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Abstract

[Problem] To provide an active filter device capable of improving attenuation characteristics of a common mode noise filter in a high frequency region without using a common mode transformer and without largely increasing volume and weight of a passive-type common mode noise filter. [Solution] An active filer device 1 includes: a common mode choke coil 28 inserted into a pair of power source lines 11 and 12; a detection unit 29 that detects a common mode voltage; inverting amplifiers 37 and 57 that invert and amplify the common mode voltage detected by the detection unit 29; and two pairs of Y capacitors 21, 22, 41, and 42 having different capacitance values and respectively connected between outputs of the inverting amplifiers and the pair of power source lines 11 and 12, and output voltages of the inverting amplifiers 37 and 57 are respectively applied to the Y capacitors 21, 22, 41, and 42 as compensation voltages.

Description

アクティブフィルタ装置及びそれを備えた電動圧縮機ACTIVE FILTER DEVICE AND ELECTRIC COMPRESSOR HAVING THE SAME
　本発明は、コモンモードノイズを抑制するためのアクティブフィルタ装置、及び、当該アクティブフィルタ装置を備えた電動圧縮機に関するものである。 The present invention relates to an active filter device for suppressing common mode noise and an electric compressor equipped with the active filter device.
　コモンモードノイズの低減を目的としたパッシブ方式のコモンモードノイズフィルタ（パッシブフィルタ）は、一対の電源ラインとグランド電位間にそれぞれ接続されたＹコンデンサと、一対の電源ラインに挿入されたコモンモードチョークコイルから構成されていた（例えば、特許文献１参照）。 A passive common mode noise filter (passive filter) aimed at reducing common mode noise consisted of a Y capacitor connected between a pair of power supply lines and ground potential, and a common mode choke coil inserted into the pair of power supply lines (see, for example, Patent Document 1).
　しかしながら、例えば電動圧縮機のモータを駆動するインバータ装置の場合、パッシブ方式でコモンモードノイズフィルタの減衰特性を向上させるために、構成要素であるＹコンデンサで対応しようとすると、漏れ電流増加による安全面からの容量値の制約や、現実的でない容量値のものを採用する必要が生じる。また、コモンモードチョークコイルで対応しようとしても、実装可能なコイルに寸法的な制約が生じる課題があった。 However, in the case of an inverter device that drives the motor of an electric compressor, for example, in order to improve the attenuation characteristics of a common mode noise filter in a passive manner, if the Y capacitor, which is a component, is used, it will be necessary to restrict the capacitance value from a safety standpoint due to an increase in leakage current, or to adopt an unrealistic capacitance value. In addition, even if an attempt was made to use a common mode choke coil, there was a problem of dimensional restrictions on mountable coils.
　そこで、コモンモードノイズフィルタにアクティブ方式を採用したものも種々開発されている（例えば、特許文献２～特許文献４参照）。 Therefore, various types of common mode noise filters that employ an active method have been developed (see Patent Documents 2 to 4, for example).
特開２００８－７８８４４号公報JP 2008-78844 A 特許第３０４４６５０号公報Japanese Patent No. 3044650 特許第２８６３８３３号公報Japanese Patent No. 2863833 特許第５５２８５４３号公報Japanese Patent No. 5528543
　しかしながら、上記何れの文献においてもコモンモードノイズの検出や補償にコモンモードトランスを必要とし、アクティブフィルタ装置の大型化を伴うため、改善が望まれていた。また、Ｙコンデンサの容量値を大きくすることで、コモンモードノイズインピーダンスを低減することが可能だが、Ｙコンデンサの容量値の増加に伴い、寄生インダクタンスとの共振周波数が低下することで、高周波領域のノイズ低減性能が低下してしまうという課題もあった。 However, in any of the above documents, a common mode transformer is required to detect and compensate for common mode noise, which entails an increase in the size of the active filter device, so improvements have been desired. In addition, although it is possible to reduce the common mode noise impedance by increasing the capacitance value of the Y capacitor, there is also the problem that the resonance frequency with the parasitic inductance decreases as the capacitance value of the Y capacitor increases, resulting in a decrease in noise reduction performance in the high frequency region.
　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、コモンモードトランスを用いること無く、また、パッシブ方式のコモンモードノイズフィルタに対して、大きな体積や重量の増加を伴わずに、高周波領域でのコモンモードノイズフィルタの減衰特性を向上させることができるアクティブフィルタ装置、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 to solve such conventional technical problems, and aims to provide an active filter device that can improve the attenuation characteristics of a common mode noise filter in a high frequency range without using a common mode transformer and without increasing the volume or weight of a passive common mode noise filter, and an electric compressor equipped with the same.
　本発明のアクティブフィルタ装置は、一対の電源ラインに一端がそれぞれ接続された複数組のＹコンデンサと、一対の電源ラインに挿入されたコモンモードチョークコイルと、コモンモード電圧を検出する検出部と、Ｙコンデンサの各組に対応して設けられ、検出部で検出されたコモンモード電圧を反転増幅する複数の反転増幅回路を備え、Ｙコンデンサの容量値を、各組毎に異なる値とすると共に、各反転増幅回路の出力を、各組のＹコンデンサの他端にそれぞれ接続し、各反転増幅回路の出力電圧を、補償電圧として各組のＹコンデンサにそれぞれ印加することを特徴とする。 The active filter device of the present invention comprises a plurality of sets of Y capacitors each having one end connected to a pair of power supply lines, a common mode choke coil inserted in the pair of power supply lines, a detection unit for detecting a common mode voltage, and a plurality of inversion amplifier circuits provided corresponding to each set of the Y capacitors for inverting and amplifying the common mode voltage detected by the detection unit. The output voltage of the inverting amplifier circuit is applied to each pair of Y capacitors as a compensation voltage.
　請求項２の発明のアクティブフィルタ装置は、上記発明において一対のコモンモード電圧検出コンデンサから構成された単一の検出部が検出したコモンモード電圧が、各反転増幅回路に入力される構成としたことを特徴とする。 The active filter device of the invention of claim 2 is characterized in that the common mode voltage detected by a single detection unit composed of a pair of common mode voltage detection capacitors in the above invention is input to each inverting amplifier circuit.
　請求項３の発明のアクティブフィルタ装置は、検出部が各反転増幅回路に対してそれぞれ設けられていることを特徴とする。 The active filter device of the invention of claim 3 is characterized in that a detection unit is provided for each inverting amplifier circuit.
　請求項４の発明のアクティブフィルタ装置は、検出部のグランド経路と、反転増幅回路のグランド経路を、別々に回路グランドに接続したことを特徴とする。 The active filter device of the invention of claim 4 is characterized in that the ground path of the detection section and the ground path of the inverting amplifier circuit are separately connected to the circuit ground.
　請求項５の発明の電動圧縮機は、上記各発明のアクティブフィルタ装置と、インバータ装置が、筐体と一体に設けられていることを特徴とする。 The electric compressor of the invention of claim 5 is characterized in that the active filter device and the inverter device of each of the above inventions are provided integrally with a housing.
　請求項６の発明の電動圧縮機は、上記発明において筐体をグランド電位とし、回路グランドを筐体に接続すると共に、検出部のグランド経路を筐体に接続し、反転増幅回路のグランド経路を回路グランドに接続したことを特徴とする。 The electric compressor of the invention of claim 6 is characterized in that, in the above invention, the housing is set to ground potential, the circuit ground is connected to the housing, the ground path of the detection unit is connected to the housing, and the ground path of the inverting amplifier circuit is connected to the circuit ground.
　本発明のアクティブフィルタ装置によれば、一対の電源ラインに一端がそれぞれ接続された複数組のＹコンデンサと、一対の電源ラインに挿入されたコモンモードチョークコイルと、コモンモード電圧を検出する検出部と、Ｙコンデンサの各組に対応して設けられ、検出部で検出されたコモンモード電圧を反転増幅する複数の反転増幅回路を備えており、Ｙコンデンサの容量値を、各組毎に異なる値とすると共に、各反転増幅回路の出力を、各組のＹコンデンサの他端にそれぞれ接続し、各反転増幅回路の出力電圧を、補償電圧として各組のＹコンデンサにそれぞれ印加するようにしたので、各反転増幅回路のゲインに応じて各組のＹコンデンサの見かけ上の容量値が増加することになる。 According to the active filter device of the present invention, there are provided a plurality of sets of Y capacitors each having one end connected to a pair of power supply lines, a common mode choke coil inserted into the pair of power supply lines, a detection unit for detecting a common mode voltage, and a plurality of inverting amplifier circuits provided corresponding to each set of the Y capacitors for inverting and amplifying the common mode voltage detected by the detection unit. However, since the output voltage of each inverting amplifier circuit is applied to each set of Y capacitors as a compensation voltage, the apparent capacitance value of each set of Y capacitors increases according to the gain of each inverting amplifier circuit.
　このようなＹコンデンサの見かけ上の容量値の増加により、大容量のＹコンデンサや大型のコモンモードチョークコイルを用いること無く、ノイズ電流の還流を増やし、電源側へ漏れ出るコモンモード電流を低減させることができるようになる。また、コモンモードチョークコイルとＹコンデンサから成る通常のパッシブ方式のノイズフィルタに適用して、コモンモードノイズの減衰特性を改善することができるので、汎用性に富んだものとなる。 With this increase in the apparent capacitance value of the Y capacitor, it is possible to increase the return of noise current and reduce the common mode current leaking to the power supply side without using a large-capacity Y capacitor or a large common mode choke coil. In addition, since it can be applied to a normal passive noise filter comprising a common mode choke coil and a Y capacitor to improve the attenuation characteristics of common mode noise, it is highly versatile.
　特に本発明では、複数組のＹコンデンサとそれらにそれぞれ対応する複数の反転増幅回路を設け、Ｙコンデンサの容量値を、各組毎に異なる値とし、各反転増幅回路の出力を、各組のＹコンデンサの他端にそれぞれ接続して各反転増幅回路の出力電圧を、補償電圧として各組のＹコンデンサにそれぞれ印加するので、Ｙコンデンサの共振周波数に起因する高周波領域でのコモンモードノイズインピーダンスの上昇を抑制し、コモンモードノイズの減衰特性をより効果的に改善することが可能となる。また、各反転増幅回路のゲイン値も、使用目的に応じて個々に選定することで、ＥＭＩノイズの特性に合わせて、コモンモードインピーダンスの周波数特性を調整することができる。 In particular, in the present invention, a plurality of sets of Y capacitors and a plurality of inverting amplifier circuits corresponding thereto are provided, the capacitance value of each Y capacitor is set to a different value for each set, the output of each inverting amplifier circuit is connected to the other end of each set of Y capacitors, and the output voltage of each inverting amplifier circuit is applied to each set of Y capacitors as a compensation voltage. Further, by individually selecting the gain value of each inverting amplifier circuit according to the purpose of use, the frequency characteristics of common mode impedance can be adjusted in accordance with the characteristics of EMI noise.
　この場合、請求項２の発明の如く、一対のコモンモード電圧検出コンデンサから構成された単一の検出部が検出したコモンモード電圧を、各反転増幅回路に入力する構成とすることで、検出部の回路構成を簡略化することができるようになる。 In this case, as in the invention of claim 2, the common mode voltage detected by a single detection section composed of a pair of common mode voltage detection capacitors is configured to be input to each inverting amplifier circuit, thereby simplifying the circuit configuration of the detection section.
　一方、請求項３の発明の如く、検出部を各反転増幅回路に対してそれぞれ設けるようにすれば、各反転増幅回路の周波数特性に応じたコモンモードノイズ電圧の検出特性を得ることができる利点がある。 On the other hand, if a detection unit is provided for each inverting amplifier circuit as in the invention of claim 3, there is an advantage that common mode noise voltage detection characteristics corresponding to the frequency characteristics of each inverting amplifier circuit can be obtained.
　また、請求項４の発明の如く、検出部のグランド経路と、反転増幅回路のグランド経路を、別々に回路グランドに接続するようにすれば、反転増幅回路の動作電流に起因する回路グランドに対する電圧変動が、検出部によるコモンモード電圧の検出に及ぼす悪影響を低減することができるようになる。 In addition, if the ground path of the detection section and the ground path of the inverting amplifier circuit are separately connected to the circuit ground as in the invention of claim 4, it is possible to reduce the adverse effect of voltage fluctuations on the circuit ground due to the operating current of the inverting amplifier circuit on the detection of the common mode voltage by the detection section.
　そして、上記各発明のアクティブフィルタ装置は、請求項５の発明の如くインバータ装置と共に電動圧縮機の筐体に一体に設けられる場合に極めて好適なものとなる。 Then, the active filter device of each of the above inventions is extremely suitable when it is integrally provided with the housing of the electric compressor together with the inverter device as in the fifth aspect of the invention.
　また、請求項６の発明の如く筐体をグランド電位とし、回路グランドを筐体に接続すると共に、検出部のグランド経路を筐体に接続し、反転増幅回路のグランド経路を回路グランドに接続することで、反転増幅回路の動作電流に起因する回路グランドの電位変動による検出部の検出誤差を低減することが可能となる。 In addition, by setting the housing to the ground potential and connecting the circuit ground to the housing as in the invention of claim 6, connecting the ground path of the detection unit to the housing, and connecting the ground path of the inverting amplifier circuit to the circuit ground, it is possible to reduce the detection error of the detection unit due to the potential fluctuation of the circuit ground caused by the operating current of the inverting amplifier circuit.
本発明のアクティブフィルタ装置を適用した一実施例の電動圧縮機及び当該電動圧縮機への給電経路の電気回路図である。1 is an electric circuit diagram of an electric compressor of one embodiment to which an active filter device of the present invention is applied and a feed path to the electric compressor; FIG. 図１の電動圧縮機の電気回路図である（実施例１）。FIG. 2 is an electric circuit diagram of the electric compressor of FIG. 1 (Example 1). 図２のアクティブフィルタ装置の等価回路図である。3 is an equivalent circuit diagram of the active filter device of FIG. 2; FIG. 本発明のアクティブフィルタ装置によるコモンモードノイズ低減作用を説明するためのＹコンデンサのインピーダンス特性を示す図である。FIG. 5 is a diagram showing impedance characteristics of a Y capacitor for explaining the common mode noise reduction effect of the active filter device of the present invention; 図１の電動圧縮機及び当該電動圧縮機への給電経路の電気回路の他の実施例を示す図である（実施例２）。FIG. 10 is a diagram showing another embodiment of the electric circuit of the electric compressor of FIG. 1 and a power supply path to the electric compressor (Embodiment 2); 図２の電動圧縮機の電気回路の他の実施例を示す図である（実施例３）。3 is a diagram showing another example of the electric circuit of the electric compressor of FIG. 2 (Example 3); FIG.
　以下、本発明の実施の形態について、図面に基づき詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
　図１は本発明のアクティブフィルタ装置１を適用した一実施例の電動圧縮機２及び当該電動圧縮機２への給電経路の電気回路図、図２は電動圧縮機２の電気回路図をそれぞれ示している。 FIG. 1 shows an electric circuit diagram of an electric compressor 2 and a power feeding path to the electric compressor 2 of one embodiment to which the active filter device 1 of the present invention is applied, and FIG. 2 shows an electric circuit diagram of the electric compressor 2.
　実施例の電動圧縮機２は、例えば電気自動車やハイブリッド自動車等の車両に搭載されて車室内を空調す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り、インバータ装置（ＰＷＭインバータ）３及び本発明のアクティブフィルタ装置１は、この電動圧縮機２の後述する筐体１８に一体に設けられる。即ち、実施例の電動圧縮機２はインバータ一体型電動圧縮機である。 The electric compressor 2 of the embodiment constitutes a part of the refrigerant circuit of a vehicle air conditioner that is mounted in a vehicle such as an electric vehicle or a hybrid vehicle and air-conditions the interior of the vehicle. That is, the electric compressor 2 of the embodiment is an inverter-integrated electric compressor.
　インバータ装置３は、直流電源として車両に搭載された高電圧バッテリ７（ＨＶ。例えばＤＣ３５０Ｖ）からの直流電圧を任意の周波数の交流電圧に変換して電動圧縮機２のモータ８に供給し、運転するものであり、本発明の実施例のアクティブフィルタ装置１は、係るインバータ装置３にて発生するコモンモードノイズを低減するために設けられるものである。 The inverter device 3 converts a DC voltage from a high-voltage battery 7 (HV, for example, 350 V DC) mounted on the vehicle as a DC power source into an AC voltage of an arbitrary frequency and supplies it to the motor 8 of the electric compressor 2 for operation. The active filter device 1 of the embodiment of the present invention is provided to reduce common mode noise generated in the inverter device 3.
　（１）電動圧縮機２の給電経路
　図１において、インバータ装置３は、高電圧バッテリ７の正側の電源ライン１１と、負側の電源ライン１２に接続された複数のスイッチング素子（ＩＧＢＴ）１５から構成されている。図１中の２０は制御回路であり、インバータ装置３の各スイッチング素子１５は、この制御回路２０によりスイッチング制御（ＰＷＭ制御）される。また、１３は一対の前記電源ライン１１、１２間に接続された平滑コンデンサである。 (1) Power Supply Path of Electric Compressor 2 In FIG. 1, the inverter device 3 is composed of a plurality of switching elements (IGBT) 15 connected to a positive power supply line 11 of the high voltage battery 7 and a negative power supply line 12. Reference numeral 20 in FIG. 1 denotes a control circuit, and each switching element 15 of the inverter device 3 is switching-controlled (PWM-controlled) by this control circuit 20 . A smoothing capacitor 13 is connected between the pair of power supply lines 11 and 12 .
　尚、１４は車両のＥＣＵ、１６は低電圧バッテリ（ＤＣ１２Ｖ）であり、制御回路２０はＥＣＵ１４からの指令に基づき、低電圧バッテリ１６を電源としてインバータ装置３の各スイッチング素子１５をスイッチング制御する。また、１８は電動圧縮機２の筐体（アルミダイカスト製）である。更に、電動圧縮機２は、シールドされたＨＶハーネス２５（一対の電源ライン１１、１２を構成する）で高電圧バッテリ７に接続され、電動圧縮機２の筐体１８は、車両の車体に直接固定される。これにより、筐体１８がグランド電位となる。 　In addition, 14 is an ECU of the vehicle, 16 is a low voltage battery (DC 12V), and the control circuit 20 controls the switching of each switching element 15 of the inverter device 3 using the low voltage battery 16 as a power source based on a command from the ECU 14. Reference numeral 18 denotes a housing (made of aluminum die-casting) of the electric compressor 2 . Furthermore, the electric compressor 2 is connected to the high voltage battery 7 by a shielded HV harness 25 (constituting a pair of power supply lines 11 and 12), and the housing 18 of the electric compressor 2 is directly fixed to the vehicle body. As a result, the housing 18 becomes the ground potential.
　実施例のアクティブフィルタ装置１は、一対の電源ライン１１、１２と下記アクティブフィルタ補償回路２３の第１の出力間にそれぞれ接続された一組目のＹコンデンサ（ＣY1）２１、２２（第１のＹコンデンサ）と、同じく一対の電源ライン１１、１２と下記アクティブフィルタ補償回路２３の第２の出力間にそれぞれ接続された二組目のＹコンデンサ（ＣY2）４１、４２（第２のＹコンデンサ）と、これら二組のＹコンデンサ２１、２２、４１、４２と筐体１８（グランド電位）間に接続されたかたちとなるアクティブフィルタ補償回路２３と、一対の電源ライン１１、１２とアクティブフィルタ補償回路２３間にそれぞれ接続された一対のコモンモード電圧検出コンデンサ２６、２７（Ｃsense：本発明における検出部２９を構成する）と、これらＹコンデンサ２１、２２、４１、４２やアクティブフィルタ補償回路２３、コモンモード電圧検出コンデンサ２６、２７から見て高電圧バッテリ７側における一対の電源ライン１１、１２に挿入されたコモンモードチョークコイル（ＣＭＣＣ）２８から構成されている。 The active filter device 1 of the embodiment includes a first set of Y capacitors (CY1) 21, 22 (first Y capacitors) and a second set of Y capacitors (CY2) 41, 42 (second Y capacitors), an active filter compensation circuit 23 connected between the two sets of Y capacitors 21, 22, 41, 42 and the housing 18 (ground potential), and a pair of common mode voltage detection capacitors 26, 27 (Csense: constituting the detection unit 29 in the present invention), the Y capacitors 21, 22, 41, 42, the active filter compensation circuit 23, and the common mode choke coil (CMCC) 28 inserted in the pair of power supply lines 11, 12 on the high voltage battery 7 side when viewed from the common mode voltage detection capacitors 26, 27.
　（２）電動圧縮機２の電気回路
　次に、図２は電動圧縮機２の電気回路のみを抽出して示している。この図において、図１と同一符号で示すものは同一のものである。モータ８の巻線８Ｃと筐体１８間には、絶縁紙や冷媒、オイルが介在するが、このモータ８の巻線８Ｃと筐体１８間の浮遊容量を図２中に３１で示す。この浮遊容量３１を介してノイズ電流が流れ、コモンモードノイズが発生することになる。 (2) Electric Circuit of Electric Compressor 2 Next, FIG. 2 extracts and shows only the electric circuit of the electric compressor 2 . In this figure, the same reference numerals as in FIG. 1 denote the same components. Insulating paper, coolant, and oil are interposed between the windings 8C of the motor 8 and the housing 18, and the stray capacitance between the windings 8C of the motor 8 and the housing 18 is indicated by 31 in FIG. A noise current flows through this stray capacitance 31 to generate common mode noise.
　また、図２中にはアクティブフィルタ装置１のアクティブフィルタ補償回路２３の詳細を示している。実施例のアクティブフィルタ補償回路２３は、増幅器３２、５２と、これら増幅器３２、５２の反転入力端子（－）と出力端子間にそれぞれ接続された負帰還抵抗（Ｒf＿com1）３３、負帰還抵抗（Ｒf＿com2）５３と、増幅器３２、５２の正電源端子と負電源端子に接続された電源回路（ＶCC、ＶEE）３４と、前述したコモンモード電圧検出コンデンサ２６、２７と、これらコモンモード電圧検出コンデンサ２６、２７と共に検出部２９を構成するコモンモード電圧検出抵抗（Ｒsense1）３６及びコモンモード電圧検出抵抗（Ｒsense2）５６とから構成されている。 2 shows details of the active filter compensating circuit 23 of the active filter device 1. As shown in FIG.実施例のアクティブフィルタ補償回路２３は、増幅器３２、５２と、これら増幅器３２、５２の反転入力端子（－）と出力端子間にそれぞれ接続された負帰還抵抗（Ｒ f ＿ com1 ）３３、負帰還抵抗（Ｒ f ＿ com2 ）５３と、増幅器３２、５２の正電源端子と負電源端子に接続された電源回路（Ｖ CC 、Ｖ EE ）３４と、前述したコモンモード電圧検出コンデンサ２６、２７と、これらコモンモード電圧検出コンデンサ２６、２７と共に検出部２９を構成するコモンモード電圧検出抵抗（Ｒ sense1 ）３６及びコモンモード電圧検出抵抗（Ｒ sense2 ）５６とから構成されている。
　増幅器３２と負帰還抵抗３３、及び、コモンモード電圧検出抵抗３６により本発明における一つ目の反転増幅回路３７（第１の反転増幅回路：ゲインＧ1）が構成される。また、増幅器５２と負帰還抵抗５３、及び、コモンモード電圧検出抵抗５６により本発明における二つ目の反転増幅回路５７（第２の反転増幅回路：ゲインＧ2）が構成される。また、コモンモード電圧検出コンデンサ２６、２７の一端は、一対の電源ライン１１、１２にそれぞれ接続され、コモンモード電圧検出コンデンサ２６、２７の共通とされた他端には、コモンモード電圧検出抵抗３６、５６の一端がそれぞれ接続されている。 The amplifier 32, the negative feedback resistor 33, and the common mode voltage detection resistor 36 constitute a first inverting amplifier circuit 37 (first inverting amplifier circuit: gain G 1 ) in the present invention. The amplifier 52, the negative feedback resistor 53, and the common mode voltage detection resistor 56 constitute a second inverting amplifier circuit 57 (second inverting amplifier circuit: gain G 2 ) of the present invention. One ends of the common mode voltage detection capacitors 26 and 27 are connected to the pair of power supply lines 11 and 12, respectively, and the common other ends of the common mode voltage detection capacitors 26 and 27 are connected to one ends of common mode voltage detection resistors 36 and 56, respectively.
　そして、このコモンモード電圧検出抵抗３６の他端は増幅器３２の反転入力端子（－）に接続され、コモンモード電圧検出抵抗５６の他端は増幅器５２の反転入力端子（－）に接続されている。また、増幅器３２、５２の非反転入力端子（＋）は、それぞれグランド経路３８、５８にてこの実施例では回路グランド３０に接続されている。このグランド経路３８、５８が検出部２９のグランド経路となる。尚、回路グランド３０はグランド電位である筐体１８に接続されている。 The other end of the common mode voltage detection resistor 36 is connected to the inverting input terminal (-) of the amplifier 32, and the other end of the common mode voltage detection resistor 56 is connected to the inverting input terminal (-) of the amplifier 52. The non-inverting input terminals (+) of amplifiers 32 and 52 are also connected to circuit ground 30 in this embodiment by ground paths 38 and 58, respectively. The ground paths 38 and 58 serve as ground paths for the detection section 29 . The circuit ground 30 is connected to the housing 18, which is at ground potential.
　一方、前述したＹコンデンサ２１、２２の一端は、一対の電源ライン１１、１２にそれぞれ接続され、Ｙコンデンサ４１、４２の一端も、一対の電源ライン１１、１２にそれぞれ接続されている。そして、Ｙコンデンサ２１、２２の他端は、共に増幅器３２の出力端子（アクティブフィルタ補償回路２３の第１の出力）に接続され、Ｙコンデンサ４１、４２の他端は、共に増幅器５２の出力端子（アクティブフィルタ補償回路２３の第２の出力）に接続されている。 On the other hand, one ends of the Y capacitors 21 and 22 described above are connected to the pair of power supply lines 11 and 12, respectively, and one ends of the Y capacitors 41 and 42 are also connected to the pair of power supply lines 11 and 12, respectively. The other ends of the Y capacitors 21 and 22 are both connected to the output terminal of the amplifier 32 (the first output of the active filter compensation circuit 23), and the other ends of the Y capacitors 41 and 42 are both connected to the output terminal of the amplifier 52 (the second output of the active filter compensation circuit 23).
　増幅器３２、５２の電源回路３４のグランド経路３９は、この実施例ではグランド経路３８、５８とは別に回路グランド３０に接続されている。このグランド経路３９が反転増幅回路３７、５７のグランド経路である。 The ground path 39 of the power supply circuit 34 of the amplifiers 32, 52 is connected to the circuit ground 30 separately from the ground paths 38, 58 in this embodiment. This ground path 39 is the ground path of the inverting amplifier circuits 37 and 57 .
　これにより、Ｙコンデンサ２１、２２は、アクティブフィルタ補償回路２３の増幅器３２を介して、一対の電源ライン１１、１２と筐体１８（グランド電位）間に接続され、Ｙコンデンサ４１、４２は、アクティブフィルタ補償回路２３の増幅器５２を介して、一対の電源ライン１１、１２と筐体１８（グランド電位）間に接続されたかたちとなり、反転増幅回路３７（増幅器３２）の出力電圧が補償電圧としてＹコンデンサ２１、２２に印加され、反転増幅回路５７（増幅器５２）の出力電圧が補償電圧としてＹコンデンサ４１、４２に印加されることになる。 As a result, the Y capacitors 21, 22 are connected between the pair of power supply lines 11, 12 and the housing 18 (ground potential) through the amplifier 32 of the active filter compensation circuit 23, the Y capacitors 41, 42 are connected between the pair of power supply lines 11, 12 and the housing 18 (ground potential) through the amplifier 52 of the active filter compensation circuit 23, and the output voltage of the inverting amplifier circuit 37 (amplifier 32) is applied to the Y capacitors 21, 22 as a compensation voltage. , and the output voltage of the inverting amplifier circuit 57 (amplifier 52) is applied to the Y capacitors 41 and 42 as a compensation voltage.
　（３）アクティブフィルタ装置１の作用（動作）
　以上の構成で、次に図２～図４を参照しながら、この実施例のアクティブフィルタ装置１の作用（動作）について説明する。尚、図３、図４において図１、図２と同一符号で示すものは同一のものとする。図３はアクティブフィルタ装置１の等価回路を示している。尚、図３では反転増幅回路３７に関する素子の符号を付しているが、もう一つの反転増幅回路５７に関しても同様である。即ち、反転増幅回路５７の場合の図３は、Ｙコンデンサ２１、２２がＹコンデンサ４１、４２に置き換わり、増幅器３７が増幅器５７、負帰還抵抗３３が負帰還抵抗５３、コモンモード電圧検出抵抗３６がコモンモード抵抗検出抵抗５６に置き換わるものとする。 (3) Action (operation) of the active filter device 1
Next, with the above configuration, the action (operation) of the active filter device 1 of this embodiment will be described with reference to FIGS. 2 to 4. FIG. In FIGS. 3 and 4, the same reference numerals as in FIGS. 1 and 2 denote the same components. FIG. 3 shows an equivalent circuit of the active filter device 1. As shown in FIG. In FIG. 3, elements related to the inverting amplifier circuit 37 are denoted by reference numerals, but the same applies to the other inverting amplifier circuit 57 as well. 3 for the inverting amplifier circuit 57, the Y capacitors 21 and 22 are replaced with the Y capacitors 41 and 42, the amplifier 37 is replaced with the amplifier 57, the negative feedback resistor 33 is replaced with the negative feedback resistor 53, and the common mode voltage detection resistor 36 is replaced with the common mode resistance detection resistor 56.
　また、下記寄生インダクタンス５１については、Ｙコンデンサ４１、４２の場合も異なるインダクタンス値の寄生インダクタンスが図３の同様の位置に入るものとする。即ち、実際の回路においては、Ｙコンデンサ２１、２２は寄生インダクタンス５１（Ｌstray＿Cy）を有する（Ｙコンデンサ２１、２２については、実際は後述するインダクタンス値Ｌstray＿Cy1）。図３において、電源ライン１１、１２にあらわれるコモンモード電圧（ＨＶコモンモード電圧）をｖHV＿com、反転増幅回路３７の補償電圧をｖcomp＿comで表すと、コモンモード電圧検出抵抗３６が接続される反転増幅回路３７の入力端子は仮想接地となるため、コモンモード電圧（ＨＶコモンモード電圧）ｖHV＿comは、下記数式（Ｉ）で表すことができる。 As for the parasitic inductance 51 described below, it is assumed that the parasitic inductances of different inductance values are placed in the same positions in FIG. That is, in an actual circuit, the Y capacitors 21 and 22 have a parasitic inductance 51 (L stray — Cy ) (the Y capacitors 21 and 22 actually have an inductance value L stray — Cy1 which will be described later). In FIG. 3, the common mode voltage (HV common mode voltage) appearing on the power supply lines 11 and 12 is represented by v HV_com , and the compensation voltage of the inverting amplifier circuit 37 is represented by v comp _ com .
　尚、Ｒsenseはコモンモード電圧検出抵抗の抵抗値であり、コモンモード電圧検出抵抗３６の場合はＲsense1が代入される（以下、同じ）。また、Ｃsenseはコモンモード電圧検出コンデンサ２６、２７の容量値であり、Ｃsense（×２）はそれらの合成容量値を意味している。更に、Ｇ1は反転増幅回路３７のゲインであり、Ｇ1＝Ｒf＿com／Ｒsenseとなる。このＲf＿comは負帰還抵抗の抵抗値であり、負帰還抵抗３３の場合には、Ｒf＿com1が代入される。 Incidentally, R sense is the resistance value of the common mode voltage detection resistor, and in the case of the common mode voltage detection resistor 36, R sense1 is substituted (same below). Also, C sense is the capacitance value of the common mode voltage detection capacitors 26 and 27, and C sense (×2) means their combined capacitance value. Furthermore, G 1 is the gain of the inverting amplifier circuit 37, and G 1 =R f — com /R sense . This R f — com is the resistance value of the negative feedback resistor, and in the case of the negative feedback resistor 33, R f — com1 is substituted.
　また、Ｌstray＿Cyは寄生インダクタンス５１のインダクタンス値であり、Ｌstray＿Cy（×１／２）はそれらの合成インダクタンス値を意味している。ＣYはＹコンデンサの容量値、ＣY（×２）はそれらの合成容量値を意味しており、Ｙコンデンサ２１、２２の場合には、ＣY1、ＣY1（×２）がそれぞれ代入される（以下、同じ）。更に、ＩCYはＹコンデンサを流れる電流であり、Ｙコンデンサ２１、２２を流れる電流は、ＩCY1となる。 Also, L stray — Cy is the inductance value of the parasitic inductance 51, and L stray — Cy (×1/2) means their combined inductance value. C Y means the capacitance value of the Y capacitor, and C Y ( × 2) means the combined capacitance value thereof. Furthermore, I CY is the current flowing through the Y capacitor, and the current flowing through Y capacitors 21 and 22 is I CY1 .
Figure JPOXMLDOC01-appb-M000001
Figure JPOXMLDOC01-appb-M000001
　数式（Ｉ）より、下記数式（ＩＩ）が成り立つ。 The following formula (II) holds from formula (I).
Figure JPOXMLDOC01-appb-M000002
Figure JPOXMLDOC01-appb-M000002
　アクティブフィルタ補償回路２３の補償によるＹコンデンサのインピーダンスをＺCyとすると、インピーダンスＺCyは下記数式（ＩＩＩ）となる。 Assuming that the impedance of the Y capacitor resulting from compensation by the active filter compensation circuit 23 is Z Cy , the impedance Z Cy is given by the following formula (III).
Figure JPOXMLDOC01-appb-M000003
Figure JPOXMLDOC01-appb-M000003
　数式（Ｉ）～数式（ＩＩＩ）を用いてインピーダンスＺCyをコモンモード電圧検出コンデンサ２６、２７の合成容量値Ｃsense（×２）、コモンモード電圧検出抵抗の抵抗値Ｒsense、Ｙコンデンサの合成容量値ＣY（×２）、寄生インダクタンス５１のインダクタンス値Ｌstray＿Cyで表すと、下記数式（ＩＶ）となる。 Using the formulas (I) to (III), the impedance Z Cy is represented by the combined capacitance value C sense (×2) of the common mode voltage detection capacitors 26 and 27, the resistance value R sense of the common mode voltage detection resistor, the combined capacitance value C Y (×2) of the Y capacitor, and the inductance value L stray — Cy of the parasitic inductance 51, resulting in the following formula (IV).
Figure JPOXMLDOC01-appb-M000004
Figure JPOXMLDOC01-appb-M000004
　ここで、高周波領域においては、コモンモード電圧検出コンデンサ２６、２７のインピーダンスがコモンモード電圧検出抵抗のインピーダンスに対して無視できるようにコモンモード電圧検出コンデンサ２６、２７の容量値Ｃsenseとコモンモード電圧検出抵抗の抵抗値Ｒsenseを選定することで、数式（ＩＶ）は下記数式（Ｖ）と見なすことができる。 Here, in the high-frequency region, the capacitance value C sense of the common mode voltage detection capacitors 26 and 27 and the resistance value R sense of the common mode voltage detection resistor are selected such that the impedance of the common mode voltage detection capacitors 26 and 27 can be ignored with respect to the impedance of the common mode voltage detection resistor.
Figure JPOXMLDOC01-appb-M000005
Figure JPOXMLDOC01-appb-M000005
　ここで、本発明ではＹコンデンサ２１、２２の容量値ＣY1を、Ｙコンデンサ４１、４２の容量値ＣY2とは異なる値とする。実施例ではＹコンデンサ４１、４２の容量値ＣY2が、Ｙコンデンサ２１、２２の容量値ＣY1に対して１／１０の値となるものを選定している。 Here, in the present invention, the capacitance value C Y1 of the Y capacitors 21 and 22 is set to a value different from the capacitance value C Y2 of the Y capacitors 41 and 42 . In the embodiment, the capacitance value C Y2 of the Y capacitors 41 and 42 is selected to be 1/10 of the capacitance value C Y1 of the Y capacitors 21 and 22 .
　そして、Ｙコンデンサ２１、２２のインピーダンスＺCy1は、数式（Ｖ）より下記数式（ＶＩ）となり、Ｙコンデンサ４１、４２のインピーダンスＺCy2は、下記数式（ＶＩＩ）となる。尚、数式（ＶＩ）、（ＶＩＩ）においては、Ｙコンデンサ２１、２２の寄生インダクタンスのインダクタンス値をＬstray＿Cy1、反転増幅回路３７のゲインをＧ1で示し、Ｙコンデンサ４１、４２の前述した寄生インダクタンスのインダクタンス値をＬstray＿Cy2、反転増幅回路５７のゲインをＧ2で示している。 Then, the impedance Z Cy1 of the Y capacitors 21 and 22 is given by the following formula (VI) from the formula (V), and the impedance Z Cy2 of the Y capacitors 41 and 42 is given by the following formula (VII). In the formulas (VI) and (VII), the inductance value of the parasitic inductance of the Y capacitors 21 and 22 is indicated by L stray_Cy1, the gain of the inverting amplifier circuit 37 is indicated by G1, the inductance value of the parasitic inductance of the Y capacitors 41 and 42 is indicated by L stray_Cy2 , and the gain of the inverting amplifier circuit 57 is indicated by G2 .
Figure JPOXMLDOC01-appb-M000006
Figure JPOXMLDOC01-appb-M000006
Figure JPOXMLDOC01-appb-M000007
Figure JPOXMLDOC01-appb-M000007
　上記数式（ＶＩ）は、（１＋Ｇ1）倍のＹコンデンサが接続されているのと等価であることを意味しており、上記数式（ＶＩＩ）は、（１＋Ｇ2）倍のＹコンデンサが接続されているのと等価であることを意味している。即ち、アクティブフィルタ補償回路２３の補償により、Ｙコンデンサ２１、２２の容量値が見かけ上、（１＋Ｇ1）倍に増加し、Ｙコンデンサ４１、４２の容量値が見かけ上、（１＋Ｇ2）倍に増加したことになる。尚、寄生インダクタンス５１のインダクタンス値は等価的に低減（１／（１＋Ｇ1）、１／（１＋Ｇ2））される。 The above formula (VI) means that it is equivalent to (1+G 1 ) times the Y capacitor being connected, and the above formula (VII) means that it is equivalent to (1+G 2 ) times the Y capacitor being connected. That is, the compensation by the active filter compensation circuit 23 apparently increases the capacitance values of the Y capacitors 21 and 22 by (1+G 1 ) times, and apparently increases the capacitance values of the Y capacitors 41 and 42 by (1+G 2 ) times. The inductance value of the parasitic inductance 51 is equivalently reduced (1/(1+G 1 ), 1/(1+G 2 )).
　以上のように検出部２９で検出されたコモンモード電圧ｖHV＿comを反転増幅する反転増幅回路３７及び５７を設け、この反転増幅回路３７、５７の出力電圧を補償電圧ｖcomp＿com1、ｖcomp＿com2としてＹコンデンサ２１、２２、及び、Ｙコンデンサ４１、４２にそれぞれ印加するようにしたので、反転増幅回路３７のゲインＧ1に応じてＹコンデンサ２１、２２の見かけ上の容量値が増加（（１＋Ｇ1）倍）し、反転増幅回路５７のゲインＧ2に応じてＹコンデンサ４１、４２の見かけ上の容量値が増加（（１＋Ｇ2）倍）することになる。 As described above, the inverting amplifier circuits 37 and 57 for inverting and amplifying the common mode voltage v HV_com detected by the detection unit 29 are provided, and the output voltages of the inverting amplifier circuits 37 and 57 are applied as compensation voltages v comp _ com1 and v comp _ com2 to the Y capacitors 21 and 22 and the Y capacitors 41 and 42 , respectively. (1+G 1 ) times), and the apparent capacitance values of the Y capacitors 41 and 42 increase ((1+G 2 ) times ) according to the gain G 2 of the inverting amplifier circuit 57 .
　図４の粗い破線は通常のパッシブ方式のノイズフィルタのＹコンデンサ（容量値ＣY1）のインピーダンス特性を示し、最も細かい破線はアクティブフィルタ装置１のＹコンデンサ２１、２２（容量値ＣY1）のみのインピーダンス特性を示し、中間の破線はアクティブフィルタ装置１のＹコンデンサ４１、４２（容量値ＣY2）のみのインピーダンス特性をそれぞれ示している。また、実線は本発明のアクティブフィルタ装置１によるＹコンデンサ２１、２２（容量値ＣY1）、及び、Ｙコンデンサ４１、４２（容量値ＣY2）の並列接続のインピーダンス特性を示している。 The coarse dashed line in FIG. 4 indicates the impedance characteristic of the Y capacitor (capacitance value C Y1 ) of the ordinary passive noise filter, the finest broken line indicates the impedance characteristic of only the Y capacitors 21 and 22 (capacitance value C Y1 ) of the active filter device 1, and the middle broken line indicates the impedance characteristic of only the Y capacitors 41 and 42 (capacitance value C Y2 ) of the active filter device 1. A solid line indicates impedance characteristics of parallel connection of the Y capacitors 21 and 22 (capacitance value C Y1 ) and the Y capacitors 41 and 42 (capacitance value C Y2 ) in the active filter device 1 of the present invention.
　尚、ＺCyはＹコンデンサのインピーダンスである。この図からも明らかな如く本発明のアクティブフィルタ装置１によれば、各Ｙコンデンサ２１、２２の容量値が見かけ上増加して、インピーダンスＺCyが通常のパッシブ方式のノイズフィルタよりもゲインＧ1の値に応じて減少している（図４の最も細かい破線）。 Note that Z Cy is the impedance of the Y capacitor. As is clear from this figure, according to the active filter device 1 of the present invention, the capacitance values of the Y capacitors 21 and 22 apparently increase, and the impedance Z Cy decreases in accordance with the value of the gain G 1 as compared to a normal passive noise filter (the finest broken line in FIG. 4).
　係るＹコンデンサ２１、２２の見かけ上の容量値の増加により、大容量のＹコンデンサや大型のコモンモードチョークコイルを用いること無く、図２中に破線矢印で示すノイズ電流の還流を増やし、電源側へ漏れ出るコモンモード電流を低減し、コモンモードノイズを低下させることができるようになる。 Due to the increase in the apparent capacitance value of the Y capacitors 21 and 22, it is possible to increase the return of the noise current indicated by the broken line arrow in FIG.
　一方、Ｙコンデンサ２１、２２と反転増幅回路３７のみの場合、Ｙコンデンサ２１、２２の寄生インダクタンスとの共振により、共振周波数より高い周波数においてはインダクタンス成分が支配的となるため、図の最も細かい破線で示すように、高周波領域においてインピーダンスＺCyが上昇している。他方本発明の如く、Ｙコンデンサ２１、２２の１／１０（実施例）の容量値のＹコンデンサ４１、４２を接続し、更に、ゲインＧ2の反転増幅回路５７（ゲインＧ1とゲインＧ2は個々に設定できる）を用いることで、図４に実線で示すように、共振周波数より高い周波数領域におけるインピーダンスＺCyの上昇が抑えられる。 On the other hand, in the case of only the Y capacitors 21 and 22 and the inverting amplifier circuit 37, the inductance component becomes dominant at frequencies higher than the resonance frequency due to resonance with the parasitic inductance of the Y capacitors 21 and 22, so the impedance Z Cy rises in the high frequency region as indicated by the finest broken line in the figure. On the other hand, as in the present invention, by connecting the Y capacitors 41 and 42 having a capacitance value 1/10 (embodiment) of the Y capacitors 21 and 22 and using the inverting amplifier circuit 57 with a gain of G2 (gain G1 and gain G2 can be set individually), as shown by the solid line in FIG.
　即ち、本は発明ではＹコンデンサの共振周波数に起因する高周波領域でのコモンモードノイズインピーダンスの上昇を抑制し、コモンモードノイズの減衰特性をより効果的に改善することが可能となる。また、各反転増幅回路３７、５７のゲイン値（Ｇ1、Ｇ2）も、使用目的に応じて個々に選定する。それにより、本発明によればＥＭＩノイズの特性に合わせて、コモンモードインピーダンスの周波数特性を調整することができるようになる。 That is, according to the present invention, it is possible to suppress an increase in common mode noise impedance in a high frequency region caused by the resonance frequency of the Y capacitor, and to more effectively improve the attenuation characteristics of common mode noise. Also, the gain values (G 1 , G 2 ) of the inverting amplifier circuits 37, 57 are individually selected according to the purpose of use. As a result, according to the present invention, the frequency characteristics of common mode impedance can be adjusted in accordance with the characteristics of EMI noise.
　また、本発明によれば、コモンモードチョークコイルとＹコンデンサから成る通常のパッシブ方式のノイズフィルタにアクティブフィルタ補償回路２３を追加して、コモンモードノイズの減衰特性を改善することができるので、汎用性に富んだものとなる。 In addition, according to the present invention, the active filter compensation circuit 23 can be added to a normal passive type noise filter consisting of a common mode choke coil and a Y capacitor to improve the attenuation characteristics of common mode noise, so it is highly versatile.
　また、実施例では一対のコモンモード電圧検出コンデンサ２６、２７から構成された単一の検出部２９が検出したコモンモード電圧ｖHV＿comを、各反転増幅回路３７、５７に入力する構成としているので、検出部２９の回路構成を簡略化することができるようになる。 Further, in the embodiment, the common mode voltage v HV_com detected by the single detection section 29 composed of the pair of common mode voltage detection capacitors 26 and 27 is input to the inverting amplifier circuits 37 and 57, so that the circuit configuration of the detection section 29 can be simplified.
　そして、本発明のアクティブフィルタ装置１は、実施例の如くインバータ装置３と共に電動圧縮機２の筐体１８に一体に設けられる場合に極めて好適なものとなる。 The active filter device 1 of the present invention is extremely suitable when it is provided integrally with the housing 18 of the electric compressor 2 together with the inverter device 3 as in the embodiment.
　また、実施例では検出部２９のグランド経路３８、５８と、反転増幅回路３７、５７のグランド経路３９を、別々に回路グランド３０に接続しているので、反転増幅回路３７、５７の動作電流に起因する回路グランド３０に対する電圧変動が、検出部２９によるコモンモード電圧の検出に及ぼす悪影響を低減することができるようになる。 In addition, in the embodiment, the ground paths 38 and 58 of the detection section 29 and the ground path 39 of the inverting amplifier circuits 37 and 57 are separately connected to the circuit ground 30, so that it is possible to reduce the adverse effect of the voltage fluctuation on the circuit ground 30 caused by the operating currents of the inverting amplifier circuits 37 and 57 on the detection of the common mode voltage by the detection section 29.
　次に、図５は本発明の他の実施例の電動圧縮機２及び当該電動圧縮機２への給電経路の電気回路図を示している。尚、この図において図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。この実施例の場合、アクティブフィルタ補償回路２３の反転増幅回路３７と反転増幅回路５７に対して、検出部（符号２９Ａ、２９Ｂで示す）をそれぞれ設けている。 Next, FIG. 5 shows an electric circuit diagram of an electric compressor 2 and a feed path to the electric compressor 2 of another embodiment of the present invention. In this figure, the same reference numerals as in FIG. 1 have the same or similar functions. In this embodiment, the inverting amplifier circuit 37 and the inverting amplifier circuit 57 of the active filter compensating circuit 23 are provided with detectors (denoted by reference numerals 29A and 29B), respectively.
　この場合、反転増幅回路３７用の検出部２９Ａは、電源ライン１１、１２に一端がそれぞれ接続された第１のコモンモード電圧検出コンデンサ２６Ａ、２７Ａ（Ｃsense1）と、それらの他端に接続された前記コモンモード電圧検出抵抗３６（図２）で構成され、反転増幅回路５７用の検出部２９Ｂは、電源ライン１１、１２に一端がそれぞれ接続された第２のコモンモード電圧検出コンデンサ２６Ｂ、２７Ｂ（Ｃsense2）と、それらの他端にそれぞれ接続された前記コモンモード電圧検出抵抗５６（図２）で構成されることになる。 In this case, the detection section 29A for the inverting amplifier circuit 37 is composed of the first common mode voltage detection capacitors 26A and 27A (C sense1 ) whose one ends are connected to the power supply lines 11 and 12, respectively, and the common mode voltage detection resistor 36 (FIG. 2) connected to the other ends thereof. (C sense2 ) and the common mode voltage sensing resistors 56 (FIG. 2) respectively connected to their other ends.
　このように、検出部２９Ａ、２９Ｂを、反転増幅回路３７と反転増幅回路５７に対してそれぞれ設けるようにすれば、各反転増幅回路３７、５７の周波数特性に応じたコモンモードノイズ電圧の検出特性を得ることができる利点がある。 In this way, if the detection units 29A and 29B are provided for the inverting amplifier circuit 37 and the inverting amplifier circuit 57, respectively, there is an advantage that common mode noise voltage detection characteristics corresponding to the frequency characteristics of the respective inverting amplifier circuits 37 and 57 can be obtained.
　次に、図６は本発明の電動圧縮機２の他の実施例の電気回路を示している。尚、この図において図１や図２と同一符号で示すものは同一のものとする。この実施例の場合、検出部２９のグランド経路３８、５８は、直接筐体１８（グランド電位）に接続され、増幅器３２、５２の電源回路３４のグランド経路３９（反転増幅回路３７、５７のグランド経路）は前述同様に回路グランド３０に接続されている。 Next, FIG. 6 shows an electric circuit of another embodiment of the electric compressor 2 of the present invention. 1 and 2 are denoted by the same reference numerals as in FIG. 1 and FIG. In this embodiment, the ground paths 38, 58 of the detector 29 are directly connected to the housing 18 (ground potential), and the ground paths 39 of the power supply circuits 34 of the amplifiers 32, 52 (ground paths of the inverting amplifier circuits 37, 57) are connected to the circuit ground 30 in the same manner as described above.
　この実施例のように、筐体１８をグランド電位とし、回路グランド３０を筐体１８に接続すると共に、検出部２９のグランド経路３８、５８を筐体１８に接続し、反転増幅回路３７、５７のグランド経路３９を回路グランド３０に接続するようにすれば、反転増幅回路３７、５７の動作電流に起因する回路グランド３０の電位変動による検出部２９の検出誤差を低減することが可能となる。 As in this embodiment, by setting the housing 18 to the ground potential, connecting the circuit ground 30 to the housing 18, connecting the ground paths 38 and 58 of the detecting section 29 to the housing 18, and connecting the ground path 39 of the inverting amplifier circuits 37 and 57 to the circuit ground 30, it is possible to reduce the detection error of the detecting section 29 due to the potential fluctuation of the circuit ground 30 caused by the operating current of the inverting amplifier circuits 37 and 57.
　尚、実施例ではＹコンデンサ（２１、２２、４１、４２）を二組接続し、各組のＹコンデンサに対して反転増幅回路（３７、５７）をそれぞれ設けるようにしたが、更に多くの組のＹコンデンサを接続して、各組毎にＹコンデンサの容量値を異なる値とし、各組のＹコンデンサに対して更に多くの反転増幅回路をそれぞれ設けるようにしてもよい。 In the embodiment, two sets of Y capacitors (21, 22, 41, 42) are connected, and an inverting amplifier circuit (37, 57) is provided for each set of Y capacitors. However, more sets of Y capacitors may be connected, the capacitance value of the Y capacitors may be different for each set, and more inverting amplifier circuits may be provided for each set of Y capacitors.
　また、実施例では車両用空気調和装置の冷媒回路を構成する電動圧縮機２に本発明のアクティブフィルタ装置１を適用したが、請求項１乃至請求項４の発明ではそれに限らず、コモンモードノイズの低減要求のある各種家庭用／業務用機器に本発明は有効である。 In addition, in the embodiment, the active filter device 1 of the present invention is applied to the electric compressor 2 that constitutes the refrigerant circuit of the vehicle air conditioner, but the invention of claims 1 to 4 is not limited to this, and the present invention is effective for various household/commercial equipment that requires reduction of common mode noise.
　１　アクティブフィルタ装置
　２　電動圧縮機
　３　インバータ装置
　４　インバータ収容部
　７　高電圧バッテリ（直流電源）
　８　モータ
　１１、１２　電源ライン
　１５　スイッチング素子
　１８　筐体
　２０　制御回路
　２１、２２、４１、４２　Ｙコンデンサ
　２３　アクティブフィルタ補償回路
　２６、２７、２６Ａ、２７Ａ、２６Ｂ、２７Ｂ　コモンモード電圧検出コンデンサ
　２８　コモンモードチョークコイル
　２９、２９Ａ、２９Ｂ　検出部
　３０　回路グランド
　３２、５２　増幅器（オペアンプ単体、若しくは、出力に電流増幅器を備えたオペアンプ）
　３６、５６　コモンモード電圧検出抵抗
　３７、５７　反転増幅回路
　３８、３９、５８　グランド経路 1 Active Filter Device 2 Electric Compressor 3 Inverter Device 4 Inverter Housing 7 High Voltage Battery (DC Power Supply)
8 motor 11, 12 power supply line 15 switching element 18 housing 20 control circuit 21, 22, 41, 42 Y capacitor 23 active filter compensation circuit 26, 27, 26A, 27A, 26B, 27B common mode voltage detection capacitor 28 common mode choke coil 29, 29A, 29B detector 30 circuit ground 32, 52 amplifier (operational amplifier unit, Or an operational amplifier with a current amplifier at the output)
36, 56 common mode voltage detection resistor 37, 57 inverting amplifier circuit 38, 39, 58 ground path

Claims (6)

  1. 　一対の電源ラインに一端がそれぞれ接続された複数組のＹコンデンサと、
    　前記一対の電源ラインに挿入されたコモンモードチョークコイルと、
    　コモンモード電圧を検出する検出部と、
    　前記Ｙコンデンサの各組に対応して設けられ、前記検出部で検出されたコモンモード電圧を反転増幅する複数の反転増幅回路を備え、
    　前記Ｙコンデンサの容量値を、各組毎に異なる値とすると共に、
    　前記各反転増幅回路の出力を、前記各組のＹコンデンサの他端にそれぞれ接続し、前記各反転増幅回路の出力電圧を、補償電圧として前記各組のＹコンデンサにそれぞれ印加することを特徴とするアクティブフィルタ装置。     a plurality of sets of Y capacitors each having one end connected to a pair of power supply lines;
    a common mode choke coil inserted in the pair of power supply lines;
    a detection unit that detects a common mode voltage;
    a plurality of inverting amplifier circuits provided corresponding to each set of the Y capacitors for inverting and amplifying the common mode voltage detected by the detecting unit;
    The capacitance value of the Y capacitor is set to a different value for each set,
    An active filter device, wherein the output of each inverting amplifier circuit is connected to the other end of each Y capacitor of each set, and the output voltage of each inverting amplifier circuit is applied to each set of Y capacitors as a compensation voltage.
  2. 　一対のコモンモード電圧検出コンデンサから構成された単一の前記検出部が検出したコモンモード電圧が、前記各反転増幅回路に入力される構成としたことを特徴とする請求項１に記載のアクティブフィルタ装置。 2. The active filter device according to claim 1, wherein the common mode voltage detected by the single detection section composed of a pair of common mode voltage detection capacitors is input to each of the inverting amplifier circuits.
  3. 　前記検出部は、前記各反転増幅回路に対してそれぞれ設けられていることを特徴とする請求項１に記載のアクティブフィルタ装置。 2. The active filter device according to claim 1, wherein the detector is provided for each of the inverting amplifier circuits.
  4. 　前記検出部のグランド経路と、前記反転増幅回路のグランド経路を、別々に回路グランドに接続したことを特徴とする請求項１乃至請求項３のうちの何れかに記載のアクティブフィルタ装置。 4. The active filter device according to any one of claims 1 to 3, wherein a ground path of said detection section and a ground path of said inverting amplifier circuit are separately connected to a circuit ground.
  5. 　請求項１乃至請求項４のうちの何れかに記載のアクティブフィルタ装置と、インバータ装置を、筐体と一体に設けたことを特徴とする電動圧縮機。 An electric compressor, wherein the active filter device according to any one of claims 1 to 4 and an inverter device are provided integrally with a housing.
  6. 　前記筐体をグランド電位とし、回路グランドを前記筐体に接続すると共に、
    　前記検出部のグランド経路を前記筐体に接続し、前記反転増幅回路のグランド経路を前記回路グランドに接続したことを特徴とする請求項５に記載の電動圧縮機。     setting the housing to a ground potential and connecting a circuit ground to the housing;
    6. The electric compressor according to claim 5, wherein a ground path of said detector is connected to said housing, and a ground path of said inverting amplifier circuit is connected to said circuit ground.
PCT/JP2023/000935 2022-01-19 2023-01-16 Active filter device and electric compressor provided with same WO2023140208A1 (en)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
US20150078051A1 (en) * 2013-09-16 2015-03-19 Valeo Systemes De Controle Moteur Method for reducing the common mode current
JP2017038500A (en) * 2015-08-12 2017-02-16 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． Conductive noise suppression circuit and inverter device
JP2021108514A (en) * 2019-12-27 2021-07-29 オムロン株式会社 Noise filter device and power system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150078051A1 (en) * 2013-09-16 2015-03-19 Valeo Systemes De Controle Moteur Method for reducing the common mode current
JP2017038500A (en) * 2015-08-12 2017-02-16 三星電子株式会社Ｓａｍｓｕｎｇ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏ．，Ｌｔｄ． Conductive noise suppression circuit and inverter device
JP2021108514A (en) * 2019-12-27 2021-07-29 オムロン株式会社 Noise filter device and power system

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