WO2023166544A1 - ノイズフィルタ - Google Patents

ノイズフィルタ Download PDF

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Publication number
WO2023166544A1
WO2023166544A1 PCT/JP2022/008506 JP2022008506W WO2023166544A1 WO 2023166544 A1 WO2023166544 A1 WO 2023166544A1 JP 2022008506 W JP2022008506 W JP 2022008506W WO 2023166544 A1 WO2023166544 A1 WO 2023166544A1
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WO
WIPO (PCT)
Prior art keywords
voltage
output
transformer
injection
noise filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/008506
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English (en)
French (fr)
Japanese (ja)
Inventor
雄己 藤田
泰章 古庄
忍 長澤
博行 一瀬
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Mitsubishi Electric Engineering Co Ltd
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Engineering Co Ltd
Mitsubishi Electric Corp
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Filing date
Publication date
Application filed by Mitsubishi Electric Engineering Co Ltd, Mitsubishi Electric Corp filed Critical Mitsubishi Electric Engineering Co Ltd
Priority to JP2024504032A priority Critical patent/JP7714112B2/ja
Priority to CN202280092632.8A priority patent/CN118975110A/zh
Priority to US18/840,956 priority patent/US20250175160A1/en
Priority to EP22929693.4A priority patent/EP4489276A4/en
Priority to PCT/JP2022/008506 priority patent/WO2023166544A1/ja
Publication of WO2023166544A1 publication Critical patent/WO2023166544A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC
    • H02M5/42—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters
    • H02M5/44—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC
    • H02M5/453—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from AC input or output
    • H02M1/123—Suppression of common mode voltage or current
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from DC input or output
    • H02M1/143—Arrangements for reducing ripples from DC input or output using compensating arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control

Definitions

  • This application relates to noise filters.
  • the conductive noise filter of Patent Document 1 is a common mode transformer in which a secondary winding, that is, a secondary side winding is provided on a three-phase cable that connects an inverter and an AC power supply, and a primary winding, that is, the primary side of the common mode transformer.
  • a push-pull type emitter follower circuit connected to the winding, three grounded capacitors that detect the common mode voltage, a voltage dividing capacitor that divides the detected common mode voltage, and a push-pull that amplifies the divided common mode voltage. Equipped with an operational amplifier that outputs to an emitter follower circuit in the form of a common mode transformer, the common mode transformer induces in the secondary winding a canceling voltage of the opposite polarity that is the same as the detected common mode voltage.
  • the conductive noise filter of Patent Document 1 divides the detected common mode voltage and induces an offset voltage in the secondary winding according to the turns ratio of the primary winding and the secondary winding of the common mode transformer. , the voltage output to the primary winding of the common mode transformer is lowered. As a result, the withstand voltage of active elements used in emitter follower circuits and operational amplifiers can be lowered.
  • the purpose of the technology disclosed in the specification of the present application is to provide a noise filter that is compact and lightweight and can enhance the noise reduction effect.
  • An example of the noise filter disclosed in the specification of the present application is a noise filter that reduces the voltage or current of electromagnetic noise generated by a power converter that performs power conversion by switching operation of a semiconductor device.
  • a noise detector that detects the voltage based on the electromagnetic noise generated by the power converter and outputs an adjusted voltage based on the electromagnetic noise, and a compensation voltage that is opposite in polarity to the voltage based on the electromagnetic noise,
  • a compensating signal applicator superimposed on the output or input of the power converter through the transformer and a first output voltage and inverse to the first output voltage producing an injection voltage between one end and the other end of the primary winding of the transformer.
  • the injection voltage generator generates a first output voltage and a second output voltage for generating an injection voltage such that the difference between the compensation voltage superimposed by the compensation signal applicator and the voltage based on the electromagnetic noise is equal to or less than an allowable value.
  • An example noise filter disclosed herein applies a first output voltage and a second output voltage opposite in polarity to the first output voltage across a primary winding of a transformer of a compensation signal applicator, respectively, Since the compensation voltage is superimposed on the output or input of the power converter based on the injection voltage that has the same polarity as the first output voltage and is larger than the first output voltage, the noise reduction effect can be enhanced with a small size and light weight.
  • FIG. 2 is a diagram showing configurations of a first noise filter and a motor drive system according to Embodiment 1; 2 is a diagram showing the configuration of the power converter of FIG. 1; FIG. 2 is a diagram showing a configuration of a signal conditioning circuit of FIG. 1; FIG. Fig. 2 shows a first example of the injection waveform generator of Fig. 1; Fig. 2 shows a second example of the injection waveform generator of Fig. 1; Fig. 3 shows a third example of the injection waveform generator of Fig. 1; 4 is a diagram showing configurations of a second noise filter and a motor drive system according to Embodiment 1; FIG.
  • FIG. 3 is a diagram showing configurations of a third noise filter and a motor drive system according to Embodiment 1;
  • FIG. 2 is a diagram showing the core of the noise filter according to Embodiment 1;
  • FIG. 4 is a diagram showing the configuration of a fourth noise filter and a motor drive system according to Embodiment 1;
  • FIG. 10 is a diagram showing the configuration of a fifth noise filter and a motor drive system according to Embodiment 1; 12 is a diagram showing the configuration of the signal conditioning circuit of FIG. 11;
  • FIG. FIG. 10 is a diagram showing the configuration of a first noise filter and a motor drive system according to Embodiment 2;
  • FIG. 10 is a diagram showing configurations of a second noise filter and a motor drive system according to Embodiment 2;
  • FIG. 9 is a diagram showing the configuration of a third noise filter and a motor drive system according to Embodiment 2;
  • FIG. 14 shows a first example of the injection waveform generator of FIG. 13;
  • FIG. 14 illustrates a second example of the injection waveform generator of FIG. 13;
  • FIG. 14 illustrates a third example of the injection waveform generator of FIG. 13;
  • FIG. 10 is a diagram showing the configuration of a first noise filter and a motor drive system according to Embodiment 3;
  • FIG. 10 is a diagram showing the configuration of a second noise filter and a motor drive system according to Embodiment 3;
  • FIG. 11 is a diagram showing the configuration of a third noise filter and a motor drive system according to Embodiment 3;
  • FIG. 11 is a diagram showing the configuration of a first noise filter and a motor drive system according to Embodiment 4;
  • FIG. 11 is a diagram showing the configuration of a second noise filter and a motor drive system according to Embodiment 4;
  • FIG. 13 is a diagram showing the configuration of a third noise filter and a motor drive system according to Embodiment 4;
  • FIG. 10 is a diagram showing the configuration of a first noise filter and a motor drive system according to Embodiment 5;
  • FIG. 12 is a diagram showing the configuration of a second noise filter and a motor drive system according to Embodiment 5;
  • FIG. 12 is a diagram showing the configuration of a third noise filter and a motor drive system according to Embodiment 5;
  • FIG. 12 is a diagram showing the configuration of a first noise filter and a motor drive system according to Embodiment 6;
  • FIG. 13 is a diagram showing the configuration of a second noise filter and a motor drive system according to Embodiment 6;
  • FIG. 12 is a diagram showing the configuration of a third noise filter and a motor drive system according to Embodiment 6;
  • FIG. 11 is a diagram showing the configuration of a first noise filter and a motor drive system according to Embodiment 7;
  • Figure 32 shows the injection waveform generator of Figure 31;
  • FIG. 12 is a diagram showing the configuration of a second noise filter according to Embodiment 7;
  • Figure 34 shows the injection waveform generator of Figure 33;
  • FIG. 13 is a diagram showing the configuration of a third noise filter according to Embodiment 7;
  • FIG. 12 is a diagram showing the configuration of a fourth noise filter according to Embodiment 7;
  • FIG. 12 is a diagram showing the configuration of a fifth noise filter according to Embodiment 7;
  • FIG. 13 is a diagram showing the configuration of a sixth noise filter according to Embodiment 7;
  • FIG. 12 is a diagram showing the configuration of a seventh noise filter according to Embodiment 7;
  • FIG. 1 is a diagram showing the configuration of a first noise filter and a motor drive system according to Embodiment 1
  • FIG. 2 is a diagram showing the configuration of the power converter of FIG. 3 is a diagram showing the configuration of a signal adjustment circuit included in the noise detector of FIG. 1.
  • FIG. 4 is a diagram showing a first example of the injection waveform generator in FIG. 1
  • FIG. 5 is a diagram showing a second example of the injection waveform generator in FIG. 1
  • FIG. 6 is a diagram showing the injection waveform generator in FIG. It is a figure which shows the 3rd example of.
  • FIG. 7 is a diagram showing the configuration of a second noise filter and a motor drive system according to the first embodiment, and FIG.
  • FIG. 8 is a diagram showing the configuration of a third noise filter and a motor drive system according to the first embodiment.
  • 9 is a diagram showing the core of the noise filter according to Embodiment 1.
  • FIG. FIG. 10 is a diagram showing the configuration of a fourth noise filter and motor drive system according to Embodiment 1
  • FIG. 11 is a diagram showing a fifth noise filter and motor drive system according to Embodiment 1.
  • 12 is a diagram showing the configuration of the signal conditioning circuit of FIG. 11.
  • FIG. The noise filter 50 of Embodiment 1 is applied to a motor drive system 60 which is a system for controlling an induction motor 3, which is an inductive load, by a power converter 2 such as a voltage-type PWM inverter in which a plurality of semiconductor elements perform switching operations. can.
  • a power converter 2 such as a voltage-type PWM inverter in which a plurality of semiconductor elements perform switching operations. can.
  • the motor drive system 60 includes an AC power supply 1 such as a power system or a self-sustaining voltage source, a power converter 2 that converts the AC power of the AC power supply 1 into DC power and converts the DC power into AC power, and the AC power supply 1 and the power converter 2 , a three-phase power line 5 connecting the power converter 2 and the induction motor 3 , and a noise filter 50 .
  • the induction motor 3 is grounded by a ground wire 6 .
  • the potential of the ground GND that is, the ground potential is the reference potential of the noise filter 50 .
  • the three-phase power line 4 includes a u-phase three-phase power line 4u, a v-phase three-phase power line 4v, and a w-phase three-phase power line 4w.
  • the three-phase power lines 5 include a u-phase three-phase power line 5u, a v-phase three-phase power line 5v, and a w-phase three-phase power line 5w.
  • the noise filter 50 reduces the voltage or current of electromagnetic noise generated by the power converter 2 that performs power conversion by switching operation of semiconductor elements.
  • the noise filter 50 detects the voltage of the electromagnetic noise generated by the power converter 2 and outputs an adjusted voltage Vd obtained by adjusting the voltage of the electromagnetic noise.
  • a compensating signal applicator 75 that superimposes a compensating voltage Vcom having a polarity opposite to the voltage of the electromagnetic noise on the output or input of the power converter 2 via the transformer 11 having the winding m1 and the secondary winding m2;
  • a first output voltage Vo1 for generating an injection voltage Vinj between one end and the other end of the primary winding m1 of 11 and a second output voltage Vo2 having a polarity opposite to the first output voltage Vo1 are generated based on the adjustment voltage Vd. and outputs a first output voltage Vo1 to one end of the primary winding m1 of the transformer 11, and outputs a second output voltage Vo2 to the other end of the primary winding m1 of the transformer 11.
  • the voltage of electromagnetic noise is, for example, common mode voltage Vci.
  • the electromagnetic noise current is, for example, a common mode current that flows due to application of the common mode voltage Vci to the common mode path.
  • the noise detector 7 detects a voltage of electromagnetic noise as a voltage based on electromagnetic noise.
  • the noise detector 7 detects, as the voltage based on the electromagnetic noise, the current of the electromagnetic noise, that is, the voltage proportional to the mon-mode current will be described in the fifth embodiment.
  • the injection voltage generator 30 comprises injection waveform generators 10a, 10b.
  • the compensation signal applicator 75 has a transformer 11 .
  • the first output voltage Vo1 and the second output voltage Vo2 are appropriately expressed as the first output voltage Vo1 and the second output voltage Vo2, respectively.
  • the power converter 2 includes a forward conversion circuit 21 composed of semiconductor elements, a capacitor 22 which is a storage element for storing DC power, and a semiconductor element, and includes an inverse conversion circuit 23 for converting DC power into AC power.
  • the forward conversion circuit 21 is, for example, a rectifier circuit and includes six diodes D1, D2, D3, D4, D5 and D6.
  • the inverse conversion circuit 23 has six semiconductor elements Q1, Q2, Q3, Q4, Q5 and Q6.
  • Three-phase power lines 4u, 4v, and 4w having one ends connected to the AC power supply 1 have the other ends connected to AC input terminals 41u, 41v, and 41w of the power converter 2, respectively.
  • Three-phase power lines 5u, 5v, and 5w having one ends connected to the induction motor 3 have the other ends connected to AC output terminals 42u, 42v, and 42w of the power converter 2, respectively.
  • the forward conversion circuit 21 includes a first series body of diodes D1 and D2 connected in series and diodes D3 and D4 connected in series between the high potential side wiring 44p and the low potential side wiring 44s.
  • a second series body and a third series body are arranged, which are diodes D5, D6 connected in series.
  • a connection point n1 between the diode D1 and the diode D2 is connected to the AC input terminal 41u.
  • a connection point n2 between the diodes D3 and D4 is connected to the AC input terminal 41v, and a connection point n3 between the diodes D5 and D6 is connected to the AC input terminal 41w.
  • the capacitor 22 is connected between the high potential side wiring 44p and the low potential side wiring 44s.
  • the inverse conversion circuit 23 is provided between the high-potential-side wiring 44p and the low-potential-side wiring 44s by a fourth series body consisting of semiconductor elements Q1 and Q2 connected in series and semiconductor elements Q3 and Q4 connected in series.
  • a certain fifth series body and a sixth series body, which are semiconductor devices Q5 and Q6 connected in series, are arranged.
  • a connection point n4 between the semiconductor element Q1 and the semiconductor element Q2 is connected to the AC output terminal 42u.
  • a connection point n5 between the semiconductor elements Q3 and Q4 is connected to an AC output terminal 42v, and a connection point n6 between the semiconductor elements Q5 and Q6 is connected to an AC output terminal 42w.
  • MOSFETs Metal-Oxide-Semiconductor Field-Effect Transistors
  • IGBTs Insulated Gate Bipolar Transistors
  • FIG. 2 shows an example of MOSFET.
  • Semiconductor elements Q1, Q2, Q3, Q4, Q5, and Q6 each include a MOS transistor M and a diode D.
  • the diode D may be an element different from the MOS transistor M, or may be a parasitic diode.
  • the drains d of the semiconductor elements Q1, Q3 and Q5 are connected to the high potential side wiring 44p, and the sources s of the semiconductor elements Q2, Q4 and Q6 are connected to the low potential side wiring 44s.
  • the source s of the semiconductor element Q1 and the drain d of the semiconductor element Q2 are connected, the source s of the semiconductor element Q3 and the drain d of the semiconductor element Q4 are connected, and the source s of the semiconductor element Q5 and the drain of the semiconductor element Q6 are connected.
  • d is connected.
  • a control signal is input from a control circuit (not shown) to gates g of semiconductor elements Q1, Q2, Q3, Q4, Q5 and Q6.
  • the inverter circuit 23 switches the semiconductor elements Q1, Q2, Q3, Q4, Q5 and Q6 based on the control signal from the control circuit to convert DC power into AC power.
  • a noise detector 7 that detects the common mode voltage Vci includes three capacitors 8 having equal capacitance and a signal conditioning circuit 9 .
  • One end of each capacitor 8 is connected to each phase of the three-phase power line 5 .
  • the other end of each capacitor 8 is connected to each other at a connection point n7.
  • the signal conditioning circuit 9 has an input terminal 94 connected to a connection point n7 to which the other end of the capacitor 8 is connected, and an output terminal 95 connected to the input terminals 51a and 51b of the injection waveform generators 10a and 10b.
  • the signal conditioning circuit 9 converts the common mode voltage Vci, which is the input voltage between the wiring 24, which is the ground wiring at the ground potential, and the input terminal 94, into a regulated voltage Vd obtained by dividing or band-limiting or both of them. is output as the output voltage.
  • a noise detector 7 detects a common mode voltage Vci and outputs an adjusted voltage Vd based on the common mode voltage Vci. More specifically, the noise detector 7 includes a capacitor 8 and a signal conditioning circuit 9 that are connected in series between the three-phase power line 5 on the output side of the power converter 2 and the wiring 24 that is the ground wiring.
  • the signal conditioning circuit outputs the adjusted voltage Vd based on the input voltage, ie, the common mode voltage Vci, which is input via the capacitor 8 .
  • the signal conditioning circuit 9 includes, for example, a capacitor 91, a differential amplifier 92 connected in parallel to the capacitor 91, a band limiter 93, and control power sources 15a and 15b.
  • the control power supply 15a supplies a positive side voltage
  • the control power supply 15b supplies a negative side voltage.
  • One end of the capacitor 91 and the inverting input terminal (negative input terminal) of the differential amplifier 92 are connected to the input terminal 94, and the other end of the capacitor 91 and the non-inverting input terminal (positive input terminal) of the differential amplifier 92 are connected. is connected to the wiring 24 which is at the ground potential.
  • the output of differential amplifier 92 is connected to band limiter 93, and the output of band limiter 93 is output from output terminal 95 as adjusted voltage Vd.
  • the band limiter 93 only needs to pass the target frequency band, and any one of a bandpass filter, a lowpass filter, and a highpass filter can be applied.
  • the adjustment voltage Vd is input to the input terminals 51a and 51b of the injection waveform generators 10a and 10b.
  • the injection voltage generator 30 includes a first injection waveform generator 10a that generates the first output voltage Vo1 based on the adjusted voltage Vd, and a second injection waveform generator 10a that generates the second output voltage Vo2 based on the adjusted voltage Vd. and a generator 10b.
  • the injection waveform generators 10a and 10b output from output terminals 52a and 52b band-limited and amplified voltages, that is, output voltages Vo1 and Vo2, based on the input adjustment voltage Vd.
  • the output voltage Vo1 output from the output terminal 52a of the injection waveform generator 10a is input to one end of the primary winding m1 of the transformer 11.
  • the output voltage Vo ⁇ b>2 output from the output terminal 52 b of the injection waveform generator 10 b is input to the other end of the transformer 11 .
  • the output voltage Vo1 and the output voltage Vo2 are voltages of the same magnitude and opposite phases. That is, the output voltage Vo1 and the output voltage Vo2 are voltages of the same magnitude and opposite polarities.
  • a difference between the output voltage Vo1 and the output voltage Vo2 that is, a voltage of twice the magnitude of Vo1 and having the same phase, ie, the same polarity, is applied.
  • the transformer 11 has a primary side winding m1 and a secondary side winding m2 on the primary side and the secondary side, respectively.
  • a secondary winding m2 of the transformer 11 is inserted in three-phase power lines 5u, 5v, and 5w, which are respective phases of the three-phase power line 5.
  • FIG. A voltage that is the difference between the output voltage Vo1 output from the injection waveform generator 10a and the output voltage Vo2 output from the injection waveform generator 10b, that is, the injection voltage Vinj is applied to the primary winding m1 of the transformer 11 and is applied to the common mode.
  • a compensating voltage Vcom which has a polarity opposite to that of the voltage Vci and is a voltage corresponding to the turns ratio between the primary winding m1 and the secondary winding m2, is generated in the secondary winding m2.
  • the compensation voltage Vcom is a superimposed voltage that is superimposed on the three-phase power line 5 .
  • the power converter 2 generates a common mode voltage Vci that changes stepwise each time the semiconductor elements Q1 to Q6 perform switching operations.
  • This common mode voltage Vci is detected by the noise detector 7 and adjusted to the adjustment voltage Vd.
  • the adjusted voltage Vd is band-limited by the injection waveform generators 10a and 10b and the voltage value is amplified.
  • the injection voltage Vinj which is the difference between the output voltage Vo1 and the output voltage Vo2, is the primary winding m1 of the transformer 11. is entered in The voltage generated in the secondary winding m2 of the transformer 11, ie, the compensation voltage Vcom, is set so as to reduce the common mode voltage Vci generated in the power converter 2.
  • the noise filter 50 of the first embodiment applies the injection voltage Vinj, which is the adjusted voltage having the polarity opposite to the common mode voltage Vci detected by the noise detector 7, to the transformer 11 based on the common mode voltage Vci detected by the noise detector 7. , and the compensation voltage Vcom is superimposed on each phase of the three-phase power line 5, so the common mode voltage Vci can be suppressed. It will be explained that the noise filter 50 of Embodiment 1 can enhance the noise reduction effect while being compact and lightweight.
  • the first to third examples of the injection waveform generator 10 shown in FIGS. 4 to 6 can be applied to the injection waveform generator 10a.
  • the injection waveform generator 10b employs an injection waveform generator 10 in which the output voltage Vo2 is opposite in phase to the output voltage Vo1 of the injection waveform generator 10a.
  • the output voltage becomes Vo1.
  • the injection waveform generator 10b that outputs the output voltage Vo2 will be referred to as the second injection waveform generator 10b.
  • the injection waveform generator 10 of the first example shown in FIG. 4 includes a band limiter 12, an amplifier 13, and control power sources 15a and 15b.
  • the control power supply 15a supplies a positive side voltage
  • the control power supply 15b supplies a negative side voltage. Since the band limiter 12 can apply only the reduced frequency band of the common mode voltage Vci to the transformer 11, the size of the transformer 11 can be reduced.
  • the band limiter 12 only needs to pass the target frequency band, and any one of a bandpass filter, a lowpass filter, and a highpass filter can be applied.
  • the amplifier 13 shown in FIG. 4 is an example of an inverting amplifier circuit.
  • the amplifier 13 has an operational amplifier 19 and resistors 16 , 17 and 18 . A ground potential is input to the positive input terminal of the operational amplifier 19 through the resistor 17 .
  • the negative input terminal of the operational amplifier 19 receives the output of the band limiter 12 through the resistor 16 and the output of the operational amplifier 19 through the resistor 18 .
  • the injection waveform generator 10 of the first example shows an example in which the amplifier 13 is an inverting amplifier circuit
  • the amplifier 13 may be a non-inverting amplifier circuit.
  • the injection waveform generator 10 of the second example shown in FIG. 5 is an example of a non-inverting amplifier circuit.
  • the output of the band limiter 12 is input to the positive input terminal of the operational amplifier 19 via the resistor 17 .
  • a ground potential is input through a resistor 16 to a negative input terminal of an operational amplifier 19 , and an output of the operational amplifier 19 is input through a resistor 18 .
  • the injection waveform generators 10a and 10b respectively output the output voltage Vo1 and the output voltage Vo2 of the same magnitude and in opposite phase
  • the injection waveform generator 10a is configured by a non-inverting amplifier circuit
  • the injection waveform generator 10b is replaced by the injection waveform generator 10b. This is satisfied by configuring with an inverting amplifier circuit.
  • the injection voltage Vinj is a signal having twice the amplitude of the output voltage Vo1 as expressed by Equation (6).
  • Vinj 2 ⁇ Vo1 (6)
  • the compensation voltage Vcom which is the voltage superimposed on the u-phase, v-phase, and w-phase of the three-phase power line 5 via the secondary winding m2 of the transformer 11, reduces the common mode voltage Vci, that is, the expression (7 ) is established, the gain Gi and the turns ratio Rr are set.
  • Vto is the allowable voltage difference. Equation (7) indicates that the absolute value of the difference between the common mode voltage Vci and the compensation voltage Vcom is equal to or less than the allowable value Vto.
  • the maximum voltage of the output voltage Vo of the injection waveform generator 10 is the voltage of the control power sources 15a and 15b.
  • the maximum voltage of the injection voltage Vinj is the voltage of the control power supplies 15a and 15b.
  • the noise filter 50 of Embodiment 1 the first injection waveform generator 10a and the second injection waveform generator 10b are provided, and the same magnitude Inverted phase output voltages Vo1 and Vo2 are input.
  • the noise filter 50 satisfies the equation (6) without increasing the output voltage Vo output by one injection waveform generator 10, that is, without increasing the output voltages Vo1 and Vo2 of the injection waveform generators 10a and 10b.
  • the injection voltage Vinj whose maximum voltage is twice that of the control power sources 15a and 15b is obtained.
  • the transformer 11 of the first embodiment has a smaller turns ratio Rr required to satisfy the expression (7).
  • the transformer 11 has one primary winding m1 and three secondary windings m2.
  • the core of the transformer 11 is, for example, a toroidal core 28 shown in FIG.
  • the core 28 has an inner diameter l, an outer diameter L, and a width (thickness) h. If the turns ratio Rr is reduced and the number of turns of the secondary winding m2 is reduced, the minimum inner diameter l of the core required for mounting the transformer is also reduced. The size and weight of the noise filter 50 can be reduced.
  • the compensation voltage Vcom which is the voltage output to the secondary winding m2
  • the second noise filter 50 shown in FIG. be able to.
  • the maximum voltage is set to twice that of the control power supplies 15a and 15b as shown in Equation (6). is obtained, the voltage of the control power supply required to obtain the same injection voltage Vinj is be halved. As a result, the control power supplies 15a and 15b of the injection waveform generator 10 can be made smaller, and the noise filter 50 can be made smaller and lighter.
  • the injection waveform generator 10 of the third example shown in FIG. 6 will be explained.
  • the injection waveform generator 10 of the third example differs from the injection waveform generator 10 of the first example in that a current buffer 14 is added between the output terminal of the amplifier 13 and the output terminal 52 .
  • the output terminal of the amplifier 13 is the connection point between the wiring for transmitting the output of the operational amplifier 19 and the resistor 18 .
  • the injection waveform generator 10 of the third example can have a larger current capacity indicating the amount of current supply than the injection waveform generator 10 of the first example.
  • the current buffer 14 comprises, for example, two transistors BT1, BT2 connected in series.
  • the collector c of the transistor BT1 is connected to the control power supply 15a, the emitter e of the transistor BT1 is connected to the emitter e of the transistor BT2, and the collector c of the transistor BT2 is connected to the control power supply 15b.
  • the output of the amplifier 13 is input to the bases b of the transistors BT1 and BT2, and the emitters e of the transistors BT1 and BT2 are connected to the output terminal 52.
  • FIG. A current buffer 14 may be added to the injection waveform generator 10 of the second example.
  • the noise detector 7 shown in FIG. 1 is connected to the three-phase power line 5
  • the noise detector 7 can also be connected to the three-phase power line 4 as shown in FIG. .
  • the common-mode voltage Vci detected from the three-phase power line 4 is equivalent to the common-mode voltage Vci detected from the three-phase power line 5, so the equation (7) should be satisfied.
  • FIG. 1 shows an example in which the transformer 11 is inserted into the three-phase power line 5
  • the positions of the transformer 11 and the noise detector 7 may be interchanged as shown in FIG.
  • the noise filter 50 of the first example shown in FIG. 1 has a feedforward configuration
  • the noise filter 50 of the second example shown in FIG. 7 has a feedback configuration.
  • the signal conditioning circuit 9 is not limited to this.
  • the signal adjustment circuit 9 can be configured with only the capacitor 91 and the differential amplifier 92, a configuration in which the capacitor 91 is replaced with a resistor, and a configuration in which the number of capacitors and resistors is increased.
  • the signal conditioning circuit 9 may include only the band limiter 93 when the common mode voltage Vci is not divided.
  • the output terminal 52a of the injection waveform generator 10a is connected to one end of the primary winding m1 of the transformer 11 and the input terminal 51b of the second injection waveform generator 10b, and the output terminal 52b of the second injection waveform generator 10b. may be connected to the other end of the primary winding m1 of the transformer 11.
  • the output voltage Vo1 which is the output of the first injection waveform generator 10a, is input to the second injection waveform generator 10b.
  • the fourth injection voltage generator 30 of the first embodiment includes a first injection waveform generator 10a that generates the first output voltage Vo1 based on the adjustment voltage Vd, and a second output voltage generator 10a that generates the first output voltage Vo1 based on the first output voltage Vo1. and a second injection waveform generator 10b for generating the voltage Vo2.
  • the output voltage Vo1 of the first injection waveform generator 10a and the output voltage Vo2 of the second injection waveform generator 10b are voltages of the same magnitude and opposite phases.
  • the second injection waveform generator 10b employs a circuit that rotates the phase of the input signal by 180° with the same gain. That is, the gain Gi of the operational amplifier 19 of the second injection waveform generator 10b is -1 when the gain Gi of the first injection waveform generator 10a is positive, and the gain Gi of the first injection waveform generator 10a is 1 if is negative.
  • the second injection waveform generator 10b needs only to rotate the phase of the input signal by 180° with the same gain of the input signal.
  • the band limiter 12 of the second injection waveform generator 10b can be removed if it exists in the generator 10a.
  • the regulated voltage Vd1 is inputted to the first injection waveform generator 10a
  • the regulated voltage Vd2 is inputted to the second injection waveform generator 10b.
  • the output voltage Vo1 of the first injection waveform generator 10a and the output voltage Vo2 of the second injection waveform generator 10b are voltages of the same magnitude and opposite phases.
  • the output terminal 95a is expressed as a first output terminal 95a
  • the output terminal 95b is expressed as a second output terminal 95b.
  • the adjusted voltage Vd1 will be referred to as the first adjusted voltage Vd1
  • the adjusted voltage Vd2 will be referred to as the second adjusted voltage Vd2.
  • the signal adjustment circuit 9 shown in FIG. 12 can be applied to the fifth noise filter 50 of the first embodiment.
  • the signal conditioning circuit 9 of FIG. 12 differs from the signal conditioning circuit 9 of FIG. 3 in that it includes two differential amplifiers 92a and 92b, two band limiters 93a and 93b, and two output terminals 95a and 95b.
  • a differential amplifier 92b is connected in parallel with the differential amplifier 92a.
  • a non-inverting input terminal of the differential amplifier 92a and an inverting input terminal of the differential amplifier 92b are connected.
  • 92b is connected to the non-inverting input terminal of 92b.
  • Outputs of differential amplifiers 92a and 92b are connected to band limiters 93a and 93b having the same configuration, respectively, and adjustment voltages Vd1 and Vd2 are output from output terminals 95a and 95b.
  • the injection waveform generators 10a and 10b can be configured with circuits having the same gain and the same phase characteristics. That is, a common circuit can be used, and characteristic errors between the injection waveform generators 10a and 10b can be reduced.
  • the adjustment voltages Vd1 and Vd2 output from the output terminals 95a and 95b may have different magnitudes and the same phase.
  • the injection waveform generators 10a and 10b to which they are input are set to output the output voltages Vo1 and Vo2 of the same magnitude and opposite phases, respectively.
  • the fifth noise filter 50 of Embodiment 1 like the first noise filter 50 of Embodiment 1, can achieve That is, an injection voltage Vinj whose maximum voltage is twice that of the control power supplies 15a and 15b can be obtained without increasing the output voltages Vo1 and Vo2 of the injection waveform generators 10a and 10b.
  • the size of the transformer 11 or the control power sources 15a and 15b can be reduced, and the noise filter 50 can be reduced in size and weight.
  • the noise detector 7 is connected in series between the three-phase power lines 5 and 4 on the output side or the input side of the power converter 2 and the wiring 24 as the ground wiring. It has a capacitor 8 and a signal conditioning circuit 9 .
  • the signal conditioning circuit 9 generates two regulated voltages, the first regulated voltage Vd1, based on the common-mode voltage Vci, which is the input voltage input via the capacitor 8.
  • the injection voltage generator 30 includes a first injection waveform generator 10a that generates a first output voltage Vo1 based on the first adjustment voltage Vd1, and a first injection waveform generator 10a that generates a first output voltage Vo1 based on the second adjustment voltage Vd2. and a second injection waveform generator 10b for generating a second output voltage Vo2. Therefore, in the fifth noise filter 50 of Embodiment 1, the size of the transformer 11 or the control power sources 15a and 15b can be reduced, and the noise filter 50 can be reduced in size and weight.
  • the output voltage Vo1 and the output voltage Vo2 have the same magnitude in the first embodiment, the output voltage Vo1 and the output voltage Vo2 may have different magnitudes. Even if the magnitudes are different, the difference between the output voltage Vo1 and the output voltage Vo2, that is, the injection voltage Vinj, which is the same-phase voltage that is larger than the output voltage Vo1, is applied to the primary winding m1 of the transformer 11 . As a result, in the noise filter 50 of Embodiment 1, the size of the transformer 11 or the control power sources 15a and 15b can be reduced, and the noise filter 50 can be made smaller and lighter.
  • the noise filter 50 of the first embodiment reduces the voltage or current (common mode voltage Vci) of electromagnetic noise generated by the power converter 2 that performs power conversion by switching operations of the semiconductor elements Q1 to Q6. It is a noise filter.
  • the noise filter 50 detects a voltage (common mode voltage Vci) based on the electromagnetic noise generated by the power converter 2, and outputs an adjusted voltage Vd obtained by adjusting the voltage (common mode voltage Vci) based on the electromagnetic noise.
  • a noise detector 7, a compensation signal applicator 75 that superimposes a voltage (common mode voltage Vci) based on electromagnetic noise and a compensation voltage Vcom having a polarity opposite to that of the voltage (common mode voltage Vci) on the output or input of the power converter 2 via the transformer 11;
  • a first output voltage Vo1 for generating an injection voltage Vinj between one end and the other end of the primary winding m1 of the transformer 11 and a second output voltage Vo2 having a polarity opposite to the first output voltage Vo1 are generated based on the adjustment voltage Vd.
  • an injection voltage generator 30 that outputs the first output voltage Vo1 to one end of the primary winding m1 of the transformer 11 and outputs the second output voltage Vo2 to the other end of the primary winding m1 of the transformer 11; It has The injection voltage generator 30 generates an injection voltage Vinj in which the difference between the compensation voltage Vcom superimposed by the compensation signal applicator 75 and the voltage (common mode voltage Vci) based on the electromagnetic noise is equal to or less than the allowable value Vto. A voltage Vo1 and a second output voltage Vo2 are generated.
  • the noise filter 50 of Embodiment 1 applies the first output voltage Vo1 and the second output voltage opposite in polarity to the first output voltage Vo1 to both ends of the primary winding m1 of the transformer 11 of the compensation signal applicator 75, respectively.
  • the compensating voltage Vcom is superimposed on the output or input of the power converter 2 based on the injection voltage Vinj having the same polarity as the first output voltage Vo1 and being larger than the first output voltage Vo1. can enhance the noise reduction effect.
  • injection voltage generator 30 includes two injection waveform generators 10a and 10b, and output voltages Vo1 and Vo2 having opposite phases (reverse polarities) are applied to compensation signal applicator 75.
  • a large injection voltage Vinj can be obtained without increasing the output of one injection waveform generator, that is, without increasing the voltages of the control power supplies 15a and 15b. Since the amplification due to the turns ratio Rr of the transformer 11 can be reduced, the number of turns of the transformer 11 can be reduced and the size of the transformer 11 can be reduced.
  • the noise filter 50 of Embodiment 1 can be miniaturized as a whole.
  • FIG. 13 is a diagram showing the configuration of a first noise filter and a motor drive system according to the second embodiment
  • FIG. 14 is a diagram showing the configuration of a second noise filter and a motor drive system according to the second embodiment.
  • FIG. 15 is a diagram showing the configuration of a third noise filter and motor drive system according to the second embodiment.
  • FIG. 16 is a diagram showing a first example of an injection waveform generator according to Embodiment 2
  • FIG. 17 is a diagram showing a second example of an injection waveform generator according to Embodiment 2
  • FIG. 2 shows a third example of an injection waveform generator of No. 2;
  • the noise filter 50 of the second embodiment is similar to that of the first embodiment. can be applied to
  • the noise detector 7 has a voltage dividing transformer 70 instead of the signal conditioning circuit 9, and the injection waveform generators 10a and 10b are based on the potential of the ground GND, that is, the ground potential. It is different from the noise filter 50 of the first embodiment in that it is changed to injection waveform generators 31a and 31b based on the reference potential Vss which is the separated potential. Differences from the noise filter 50 of Embodiment 1 will be mainly described. Similar to the transformer 11, the voltage dividing transformer 70 has a primary winding m3 and a secondary winding m4 on the primary and secondary sides, respectively. 95 is connected to one end of the secondary winding m4.
  • the noise detector 7 includes three capacitors 8 having equal capacitance and a voltage dividing transformer 70 , and one end of each capacitor 8 is connected to each phase of the three-phase power line 5 . The other end of each capacitor 8 is connected to each other at a connection point n7.
  • an input terminal 94 to which one end of the primary winding m3 is connected is connected to the connection point n7, and the other end of the primary winding m3 is connected to the wiring 24 at ground potential.
  • the voltage dividing transformer 70 has a wire 25 in which one end of the secondary winding m4 is connected to the output terminal 95 and the other end of the secondary winding m4 is the reference potential Vss of the injection voltage generator 30 and the like. It is connected to the.
  • the wiring 25 is a reference wiring that has a reference potential Vss.
  • the noise detector 7 of the second embodiment includes a capacitor 8 and a voltage divider transformer connected in series between the three-phase power lines 5 and 4 on the output side or the input side of the power converter 2 and the wiring 24 as the ground wiring. It has 70. One end of the primary winding m3 of the voltage dividing transformer 70 is connected to one end of the capacitor 8 opposite to the three-phase power lines 5 and 4, and the other end is connected to the wiring 24 which is the ground wiring. One end of the secondary winding m4 of the voltage dividing transformer 70 is connected to the wiring 25 which is a reference wiring having a reference potential Vss different from the ground potential of the wiring 24 which is the ground wiring, and the other end is connected to the adjustment voltage Vd. It is connected to an output terminal 95 for output. The noise detector 7 outputs an adjusted voltage Vd based on the input voltage to the voltage dividing transformer 70 through the capacitor 8, that is, the common mode voltage Vci.
  • FIG. 13 shows an example in which the noise detector 7 is connected to the three-phase power line 5 .
  • a voltage divided by the combined impedance of each capacitor 8 and the impedance of a voltage dividing transformer 70 connected in series, that is, the divided common mode voltage Vci is applied to the primary winding m3 of the voltage dividing transformer 70 and divided.
  • An adjusted voltage Vd corresponding to the turns ratio between the primary winding m3 and the secondary winding m4 of the voltage transformer 70 is input to the injection waveform generators 31a and 31b.
  • the common mode voltage Vci which is the input voltage between the wiring 24 at the ground potential and the input terminal 94, is divided by the impedance of the voltage dividing transformer 70. ing.
  • the output voltage Vo1 output by the injection waveform generator 31a and the output voltage Vo2 output by the injection waveform generator 31b are voltages of the same magnitude and opposite in phase. is applied to one end and the other end of the primary winding m1, the injection voltage Vinj, which is the difference, is applied.
  • the transformer 11 generates a compensating voltage Vcom across the secondary winding m2 according to the turns ratio Rr, and applies the compensating voltage Vcom to each phase of the three-phase power line 5 .
  • the noise filter 50 of the second embodiment does not increase the output voltage Vo output by one injection waveform generator 31, that is, the injection waveform generators 31a and 31b Without increasing the output voltages Vo1 and Vo2, the injection voltage Vinj whose maximum voltage is twice that of the control power sources 15a and 15b can be obtained.
  • the size of the transformer 11 or the control power sources 15a and 15b can be reduced, and the noise filter 50 can be reduced in size and weight. Therefore, the noise filter 50 of the second embodiment can suppress the common mode voltage Vci while being compact and lightweight, that is, it can enhance the noise reduction effect while being compact and lightweight.
  • the injection waveform generator 31a that outputs the output voltage Vo1 will be referred to as the first injection waveform generator 31a
  • the injection waveform generator 31b that outputs the output voltage Vo2 will be referred to as the second injection waveform generator 31b.
  • the first to third examples of the injection waveform generator 31 shown in FIGS. 16 to 18 can be applied to the injection waveform generator 31a.
  • the injection waveform generator 31b employs an injection waveform generator 31 in which the output voltage Vo2 is opposite in phase to the output voltage Vo1 of the injection waveform generator 31a.
  • the first example of the injection waveform generator 31 shown in FIG. 16 differs from the first example of the injection waveform generator 10 shown in FIG. 4 in reference potential. More specifically, the wiring 24 having the ground potential in FIG. 4 is replaced with the wiring 25 having the reference potential Vss in FIG.
  • the second example of the injection waveform generator 31 shown in FIG. 17 differs from the second example of the injection waveform generator 10 shown in FIG. 5 in reference potential.
  • the current buffer 14 may be added to the injection waveform generator 31 of the second example.
  • the input terminal 51, the output terminal 52 and the output voltage Vo of the injection waveform generator 31 are respectively 52a, the output voltage becomes Vo1.
  • the output voltage becomes Vo2.
  • the output terminal 52a of the injection waveform generator 31a is connected to one end of the primary winding m1 of the transformer 11 and the input terminal 51b of the second injection waveform generator 31b, and the output terminal 52b of the second injection waveform generator 31b. may be connected to the other end of the primary winding m1 of the transformer 11.
  • the output voltage Vo1 of the first injection waveform generator 31a and the output voltage Vo2 of the second injection waveform generator 31b are voltages of the same magnitude and opposite phases.
  • the second injection waveform generator 31b is the output of the first injection waveform generator 31a, Vo1 is entered.
  • the second injection waveform generator 31b employs a circuit that rotates the phase of the input signal by 180° with the same gain. That is, the gain Gi of the operational amplifier 19 of the second injection waveform generator 31b is -1 when the gain Gi of the first injection waveform generator 31a is positive, and the gain Gi of the first injection waveform generator 31a is 1 if is negative.
  • the second injection waveform generator 31b needs only to rotate the phase of the input signal by 180° with the same gain of the input signal.
  • the band limiter 12 of the second injection waveform generator 31b can be removed as long as it is in the generator 31a.
  • the voltage dividing transformer 70 included in the noise detector 7 has two secondary windings m4a and m4b. Output terminals 95a and 95b connected to the secondary windings m4a and m4b output adjusted voltages Vd1 and Vd2 of the same magnitude and opposite phase, and input the adjusted voltage Vd1 to the first injection waveform generator 31a. Then, the adjustment voltage Vd2 may be input to the second injection waveform generator 31b.
  • the voltage dividing transformer 70 shown in FIG. 15 will be described in detail.
  • the voltage dividing transformer 70 has a first secondary winding m4a and a second secondary winding m4b, the first secondary winding m4a having the same polarity as the primary winding m3.
  • the second secondary winding m4b is configured with a polarity opposite to that of the primary winding m3.
  • the first secondary winding m4a has one end connected to the output terminal 95a and the other end connected to the wiring 25 having the reference potential Vss.
  • the second secondary winding m4b has one end connected to the output terminal 95b and the other end connected to the wiring 25 having the reference potential Vss.
  • the output terminal 95a of the voltage dividing transformer 70 is connected to the input terminal 51a of the first injection waveform generator 31a, and the output terminal 95b of the voltage dividing transformer 70 is connected to the input terminal 51b of the second injection waveform generator 31b.
  • the injection waveform generators 31a and 31b can be configured with circuits having the same gain and the same phase characteristics. That is, a common circuit can be used, and characteristic errors between the injection waveform generators 31a and 31b can be reduced.
  • the polarity of the first secondary winding m4a and the second secondary winding m4b of the voltage dividing transformer 70 is the same as that of the primary winding m3. may be different, and the number of turns may be different. That is, the adjustment voltages Vd1 and Vd2 output from the output terminals 95a and 95b of the voltage dividing transformer 70 may differ in magnitude and may have the same phase. Depending on the adjustment voltages Vd1 and Vd2, the injection waveform generators 31a and 31b to which they are input are set so as to output the output voltages Vo1 and Vo2 of the same magnitude and opposite phases.
  • the third noise filter 50 of the second embodiment can achieve That is, the injection voltage Vinj whose maximum voltage is twice that of the control power supplies 15a and 15b can be obtained without increasing the output voltages Vo1 and Vo2 of the injection waveform generators 31a and 31b.
  • the size of the transformer 11 or the control power sources 15a and 15b can be reduced, and the noise filter 50 can be made smaller and lighter.
  • the noise detector 7 is connected in series between the three-phase power lines 5 and 4 on the output side or the input side of the power converter 2 and the wiring 24 as the ground wiring.
  • a capacitor 8 and a voltage dividing transformer 70 are provided.
  • the voltage dividing transformer 70 has two secondary windings m4a and m4b, and one end of the primary winding m3 is connected to the three-phase power lines 5 and 4 in the capacitor 8. , and the other end of the primary winding m3 is connected to a wiring 24, which is a ground wiring.
  • the first secondary winding m4a which is one of the secondary windings, has one end connected to the wiring 25 which is a reference wiring having a reference potential Vss different from the ground potential of the ground wiring. , and the other end is connected to a first output terminal 95a for outputting a first adjustment voltage Vd1, which is a first adjustment voltage.
  • a second secondary winding m4b which is the other secondary winding, has one end connected to the reference line and the other end connected to a second output terminal for outputting a second regulated voltage Vd2, which is a second regulated voltage. 95b.
  • the injection voltage generator 30 includes a first injection waveform generator 31a that generates the first output voltage Vo1 based on the first adjustment voltage Vd1, and a second injection waveform generator 31a that generates the first output voltage Vo1. and a second injection waveform generator 31b that generates a second output voltage Vo2 based on the adjusted voltage Vd2. Therefore, in the third noise filter 50 of Embodiment 2, the size of the transformer 11 or the control power sources 15a and 15b can be reduced, and the noise filter 50 can be made smaller and lighter.
  • the output voltage Vo1 and the output voltage Vo2 have the same magnitude in the second embodiment, the output voltage Vo1 and the output voltage Vo2 may have different magnitudes as in the first embodiment. Even if the magnitudes are different, the difference between the output voltage Vo1 and the output voltage Vo2, that is, the injection voltage Vinj, which is the same-phase voltage that is larger than the output voltage Vo1, is applied to the primary winding m1 of the transformer 11 .
  • the noise filter 50 of the second embodiment the size of the transformer 11 or the control power sources 15a and 15b can be reduced, and the noise filter 50 can be reduced in size and weight.
  • the noise filter 50 of the second embodiment shown in FIGS. 13 to 15 has a feedforward configuration, it can also have a feedback configuration by exchanging the positions of the transformer 11 and the noise detector 7. FIG.
  • FIG. 19 is a diagram showing the configuration of a first noise filter and a motor drive system according to the third embodiment
  • FIG. 20 is a diagram showing the configuration of a second noise filter and a motor drive system according to the third embodiment.
  • FIG. 21 is a diagram showing the configuration of a third noise filter and motor drive system according to the third embodiment.
  • the noise filter 50 of the third embodiment is a system for controlling the induction motor 3 by the power converter 2 such as a voltage-type PWM inverter in which a plurality of semiconductor elements perform switching operations, as in the first embodiment. can be applied to
  • the noise filter 50 of Embodiment 3 differs from the noise filter 50 of Embodiment 1 in that the compensation signal applicator 75 includes a signal adjustment transformer 71 and a signal applicator 72 instead of the transformer 11 .
  • the compensating signal applicator 75 of Embodiment 3 includes a signal adjusting transformer 71 which is a transformer having a primary side winding m5 and a secondary side winding m6 on the primary side and a secondary side, respectively, and a signal adjusting transformer 71 including a capacitor 73. and an applicator 72 .
  • One end of the secondary winding m6 of the signal adjustment transformer 71 is connected to the wiring 24 which is the ground wiring, and the other end is connected to the output side or the input side of the power converter 2 via the capacitor 73 of the signal applicator 72.
  • the signal applicator 72 one end of three capacitors 73 having the same capacity is connected to each phase of the three-phase power line 5, and the other ends of the three capacitors 73 are connected to each other at a connection point n8. .
  • the output terminals 52a and 52b of the injection waveform generator 10a and the injection waveform generator 10b are connected to both ends of the primary winding m5 of the signal conditioning transformer 71, and one end of the secondary winding m6 is grounded. , and the other end is connected to the connection point n8. Differences from the noise filter 50 of Embodiment 1 will be mainly described.
  • the output voltage Vo1 output from the output terminal 52a of the injection waveform generator 10a is input to one end of the primary winding m5 of the signal adjustment transformer 71.
  • the output voltage Vo2 output from the output terminal 52b of the injection waveform generator 10b is input to the other end of the signal adjustment transformer 71.
  • the output voltage Vo1 and the output voltage Vo2 are voltages of the same magnitude and opposite phases. That is, the output voltage Vo1 and the output voltage Vo2 are voltages of the same magnitude and opposite polarities.
  • the difference between the output voltage Vo1 and the output voltage Vo2, that is, the injection voltage Vinj, which is twice as large as Vo1 and has the same phase, that is, the same polarity, is applied to the primary winding m5 of the signal adjustment transformer 71 .
  • a compensation voltage Vcom is superimposed on each phase of the three-phase power line 5 through the capacitor 73 of the signal applicator 72 so as to suppress the common mode voltage Vci.
  • a current that suppresses the common mode voltage Vci flows through each phase of the three-phase power line 5 via the capacitor 73 of the signal applicator 72 .
  • the first noise filter 50 of the third embodiment since the injection waveform generator 10a and the injection waveform generator 10b output the output voltages Vo1 and Vo2 of the same magnitude and opposite in phase, the primary side winding of the signal adjustment transformer 71 is To the line m5, the difference between the output voltages Vo1 and Vo2, that is, the injection voltage Vinj having the same phase as the magnitude of Vo1 is applied. That is, the first noise filter 50 of the third embodiment does not increase the output voltage Vo output by one injection waveform generator 10, that is, the output voltages Vo1 and Vo2 of the injection waveform generators 10a and 10b are reduced to An injection voltage Vinj whose maximum voltage is twice that of the control power sources 15a and 15b can be obtained without increasing the voltage, as shown in Equation (6).
  • the first noise filter 50 of Embodiment 3 can suppress the common mode voltage Vci while being compact and lightweight, that is, it is possible to enhance the noise reduction effect while being compact and lightweight.
  • the output terminal 52a of the injection waveform generator 10a is connected to one end of the primary winding m5 of the signal conditioning transformer 71 and the input terminal 51b of the second injection waveform generator 10b.
  • the terminal 52b may be connected to the other end of the primary winding m5 of the signal conditioning transformer 71.
  • FIG. Even in this case, the output voltage Vo1 of the first injection waveform generator 10a and the output voltage Vo2 of the second injection waveform generator 10b are voltages of the same magnitude and opposite phases.
  • the second injection waveform generator 10b is the output of the first injection waveform generator 10a, Vo1 is entered.
  • the second injection waveform generator 10b employs a circuit that rotates the phase of the input signal by 180° with the same gain. That is, the gain Gi of the operational amplifier 19 of the second injection waveform generator 10b is -1 when the gain Gi of the first injection waveform generator 10a is positive, and the gain Gi of the first injection waveform generator 10a is 1 if is negative.
  • the second injection waveform generator 10b only needs to rotate the phase of the input signal by 180° with the same gain of the input signal.
  • the bandlimiter 12 of the second injection waveform generator 10b can be eliminated.
  • the signal conditioning circuit 9 included in the noise detector 7 has two output terminals 95a and 95b, each of which has the same size. , output the regulated voltages Vd1 and Vd2 in opposite phases, furthermore, the regulated voltage Vd1 is inputted to the first injection waveform generator 10a, and the regulated voltage Vd2 is inputted to the second injection waveform generator 10b. . Even in this case, the output voltage Vo1 of the first injection waveform generator 10a and the output voltage Vo2 of the second injection waveform generator 10b are voltages of the same magnitude and opposite phases.
  • the injection waveform generators 10a and 10b can be configured with circuits having the same gain and the same phase characteristics. That is, a common circuit can be used, and characteristic errors between the injection waveform generators 10a and 10b can be reduced.
  • the third noise filter 50 of the third embodiment similarly to the fifth noise filter 50 of the first embodiment, the magnitudes of the adjustment voltages Vd1 and Vd2 output from the output terminals 95a and 95b are different, and the phase may be the same.
  • the injection waveform generators 10a and 10b to which they are input are set to output the output voltages Vo1 and Vo2 of the same magnitude and opposite phases.
  • the third noise filter 50 according to the third embodiment does not increase the output voltage Vo output by one injection waveform generator 10, that is, the output voltages Vo1 and Vo2 of the injection waveform generators 10a and 10b.
  • the injection voltage Vinj whose maximum voltage is twice that of the control power sources 15a and 15b can be obtained without increasing .
  • the size of the signal adjustment transformer 71 or the control power sources 15a and 15b can be reduced, so that the noise filter 50 can be reduced in size and weight.
  • the output voltage Vo1 and the output voltage Vo2 have the same magnitude in the third embodiment, the output voltage Vo1 and the output voltage Vo2 may have different magnitudes as in the first embodiment. Even if the magnitudes are different, the difference between the output voltage Vo1 and the output voltage Vo2, that is, the injection voltage Vinj that is larger than Vo1 and in phase is applied to the primary winding m5 of the signal conditioning transformer 71 . As a result, in the noise filter 50 of Embodiment 3, the signal adjustment transformer 71 or the control power sources 15a and 15b can be made smaller, and the noise filter 50 can be made smaller and lighter.
  • the noise filter 50 of the third embodiment shown in FIGS. 19 to 21 has a feedforward configuration, the positions of the signal applicator 72 and the signal adjustment transformer 71, that is, the compensation signal applicator 75 and the noise detector 7 are exchanged. However, it can also be a feedback configuration.
  • FIG. 22 is a diagram showing the configuration of a first noise filter and a motor drive system according to the fourth embodiment
  • FIG. 23 is a diagram showing the configuration of a second noise filter and a motor drive system according to the fourth embodiment.
  • FIG. 24 is a diagram showing the configuration of a third noise filter and motor drive system according to the fourth embodiment.
  • the noise filter 50 of the fourth embodiment is similar to that of the first embodiment. can be applied to
  • the noise filter 50 of the fourth embodiment is the same as that of the embodiment in that the noise detector 7 includes a voltage dividing transformer 70 instead of the signal adjustment circuit 9 and a signal adjustment transformer 71 and a signal applicator 72 instead of the transformer 11 . 1 noise filter 50.
  • the noise filter 50 of the fourth embodiment differs from the noise filter 50 of the second embodiment in that it includes a signal adjustment transformer 71 and a signal applicator 72 instead of the transformer 11 .
  • FIG. 22 shows an example in which the noise detector 7 and the signal applicator 72 are connected to the three-phase power line 5 .
  • the output voltage Vo1 output from the output terminal 52a of the injection waveform generator 31a is input to one end of the primary winding m5 of the signal adjustment transformer 71.
  • the output voltage Vo2 output from the output terminal 52b of the injection waveform generator 31b is input to the other end of the primary winding m5 of the signal adjustment transformer 71.
  • the output voltage Vo1 and the output voltage Vo2 are voltages of the same magnitude and opposite phases. That is, the output voltage Vo1 and the output voltage Vo2 are voltages of the same magnitude and opposite polarities.
  • an injection voltage Vinj which is the difference between the output voltage Vo1 and the output voltage Vo2, that is, is twice as large as Vo1 and has the same phase, ie, the same polarity, is applied.
  • a compensation voltage Vcom is superimposed on each phase of the three-phase power line 5 through the capacitor 73 of the signal applicator 72 so as to suppress the common mode voltage Vci.
  • a current that suppresses the common mode voltage Vci flows through each phase of the three-phase power line 5 via the capacitor 73 of the signal applicator 72 .
  • the first noise filter 50 of the fourth embodiment since the injection waveform generator 31a and the injection waveform generator 31b output the output voltages Vo1 and Vo2 of the same magnitude and opposite in phase, the primary winding of the signal adjustment transformer 71 is To the line m5, the difference between the output voltages Vo1 and Vo2, that is, the injection voltage Vinj having the same phase as the magnitude of Vo1 is applied. That is, the first noise filter 50 of the fourth embodiment does not increase the output voltage Vo output by one injection waveform generator 31, that is, the output voltages Vo1 and Vo2 of the injection waveform generators 31a and 31b are reduced to An injection voltage Vinj whose maximum voltage is twice that of the control power sources 15a and 15b can be obtained without increasing the voltage, as shown in Equation (6).
  • the first noise filter 50 of Embodiment 4 can suppress the common mode voltage Vci while being compact and lightweight, that is, it can enhance the noise reduction effect while being compact and lightweight.
  • the output terminal 52a of the injection waveform generator 31a is connected to one end of the primary winding m5 of the signal conditioning transformer 71 and the input terminal 51b of the second injection waveform generator 31b.
  • the terminal 52b may be connected to the other end of the primary winding m5 of the signal conditioning transformer 71.
  • the output voltage Vo1 of the first injection waveform generator 31a and the output voltage Vo2 of the second injection waveform generator 31b are voltages of the same magnitude and opposite phases.
  • the second injection waveform generator 31b is the output of the first injection waveform generator 31a, Vo1 is entered.
  • the second injection waveform generator 31b employs a circuit that rotates the phase of the input signal by 180° with the same gain. That is, the gain Gi of the operational amplifier 19 of the second injection waveform generator 31b is -1 when the gain Gi of the first injection waveform generator 31a is positive, and the gain Gi of the first injection waveform generator 31a is 1 if is negative.
  • the band limiter 12 can generate the first injection waveform By connecting to the generator 31a, the band limiter 12 of the second injection waveform generator 31b can be removed.
  • the voltage dividing transformer 70 included in the noise detector 7 has two secondary windings m4a and m4b, each Output terminals 95a and 95b connected to the secondary windings m4a and m4b output adjusted voltages Vd1 and Vd2 of the same magnitude and opposite phase, and input the adjusted voltage Vd1 to the first injection waveform generator 31a. Then, the adjustment voltage Vd2 may be input to the second injection waveform generator 31b.
  • the voltage dividing transformer 70 and the injection waveform generators 31a and 31b in the third noise filter 50 of the fourth embodiment are the same as the voltage dividing transformer 70 and the injection waveform generators 31a and 31b in the third noise filter 50 of the second embodiment. is similar to The output voltage Vo1 of the first injection waveform generator 31a and the output voltage Vo2 of the second injection waveform generator 31b are voltages of the same magnitude and opposite phases.
  • the injection waveform generators 31a and 31b can be configured with circuits having the same gain and the same phase characteristics. That is, a common circuit can be used, and characteristic errors between the injection waveform generators 31a and 31b can be reduced.
  • the polarities of the first secondary winding m4a and the second secondary winding m4b of the voltage dividing transformer 70 are the same as the polarity of the primary winding m3.
  • the adjustment voltages Vd1 and Vd2 may have different magnitudes and the same phase.
  • the injection waveform generators 31a and 31b to which they are input are set so as to output the output voltages Vo1 and Vo2 of the same magnitude and opposite phases.
  • the third noise filter 50 of the fourth embodiment can achieve That is, the injection voltage Vinj whose maximum voltage is twice that of the control power supplies 15a and 15b can be obtained without increasing the output voltages Vo1 and Vo2 of the injection waveform generators 31a and 31b.
  • the size of the signal adjustment transformer 71 or the control power sources 15a and 15b can be reduced, and the noise filter 50 can be made smaller and lighter.
  • the output voltage Vo1 and the output voltage Vo2 have the same magnitude in the fourth embodiment, the output voltage Vo1 and the output voltage Vo2 may have different magnitudes as in the first embodiment. Even if the magnitudes are different, the difference between the output voltage Vo1 and the output voltage Vo2, that is, the injection voltage Vinj that is larger than Vo1 and in phase is applied to the primary winding m5 of the signal conditioning transformer 71 . As a result, in the noise filter 50 of Embodiment 4, the size of the signal adjustment transformer 71 or the control power sources 15a and 15b can be reduced, and the noise filter 50 can be reduced in size and weight.
  • the noise filter 50 of the fourth embodiment shown in FIGS. 22 to 24 has a feedforward configuration, the positions of the signal applicator 72 and the signal adjustment transformer 71, that is, the compensation signal applicator 75 and the noise detector 7 are exchanged. However, it can also be a feedback configuration.
  • FIG. 25 is a diagram showing the configuration of a first noise filter and motor drive system according to Embodiment 5
  • FIG. 26 is a diagram showing the configuration of a second noise filter and motor drive system according to Embodiment 5.
  • FIG. 27 is a diagram showing the configuration of a third noise filter and motor drive system according to the fifth embodiment.
  • the noise filter 50 of Embodiment 5 is a system for controlling an induction motor 3 by a power converter 2 such as a voltage-type PWM inverter in which a plurality of semiconductor elements perform switching operations, as in Embodiment 1. can be applied to
  • the noise detector 7 has a detection transformer 80, and the injection waveform generators are the injection waveform generators 31a and 31b of FIGS. This is different from the noise filter 50 of Embodiment 1 in that. Differences from the noise filter 50 of Embodiment 1 will be mainly described.
  • the noise detector 7 includes a detection transformer 80 having a primary winding m7 inserted in the three-phase power lines 5, 4 on the output side or input side of the power converter 2.
  • FIG. One end of the secondary winding m8 of the detection transformer 80 is connected to the wiring 25, which is the reference wiring having the reference potential Vss, and the other end is connected to the output terminal 95 for outputting the adjustment voltage Vd.
  • the detection transformer 80 includes a primary side winding m7 and a secondary side winding m8.
  • a voltage proportional to the current, that is, a detection voltage Vsn is detected.
  • FIG. 25 shows an example in which the primary winding m7 of the detection transformer 80 is inserted into the three-phase power lines 5u, 5v, and 5w, which are the phases of the three-phase power line 5.
  • FIG. One end of the secondary winding m8 is connected to the wiring 25 at the reference potential Vss, and the other end of the secondary winding m8 is connected to the output terminal 95.
  • the detection transformer 80 converts the detection voltage Vsn applied across the primary winding m7 to This voltage is output from the output terminal 95 to the injection waveform generators 31a and 31b as the adjusted voltage Vd, which is the output of the noise detector 7.
  • Common mode voltage Vci described in the first to fourth embodiments is the voltage of the common mode component of the electromagnetic noise in three-phase power lines 5 and 4 .
  • This common mode voltage Vci is the noise voltage itself that is theoretically generated in the path when power conversion is performed by the power converter 2 .
  • This common mode voltage Vci exists regardless of how the detection is performed.
  • Embodiments 1 to 4 show examples in which the ideal capacitor-type noise detector 7 detects the common mode voltage Vci. When a ground common mode voltage with the ground GND as a reference is detected by an ideal capacitor type noise detector, the detected voltage is the same as the common mode voltage Vci.
  • the detection circuit is devised for the convenience of the upper limit of the processing voltage, etc., a detection value different from the common mode voltage Vci can be obtained.
  • the detection circuit is devised to adjust the common mode voltage Vci to the adjustment voltage Vd.
  • the detection circuit is devised, for example, by intentionally cutting a large-amplitude low-frequency band by detecting with a high-pass filter configuration.
  • a coil-type noise detector detects a common-mode component of electromagnetic noise, unlike a capacitor-type noise detector, when a common-mode voltage Vci is applied to the common-mode path, the noise flowing through the common-mode path including the coil is detected.
  • a voltage drop occurs proportional to the value of the current (not shown).
  • a voltage drop across the primary winding m7 proportional to the value of this noise current is the detection voltage Vsn.
  • a voltage obtained by multiplying the turns ratio between the primary winding m7 and the secondary winding m8 is generated in the secondary winding m8 of the detection transformer 80, and this voltage is detected by the coil-type noise detector. It becomes the adjusted voltage Vd output by a certain noise detector 7 .
  • the voltage generated in the secondary winding m8 of the detection transformer 80 is a physical quantity different from the common mode voltage Vci, and is based on the detection voltage Vsn proportional to the value of the noise current.
  • the output voltage Vo1 output by the injection waveform generator 31a and the output voltage Vo2 output by the injection waveform generator 31b are voltages of the same magnitude and opposite in phase to each other.
  • An injection voltage Vinj which is the difference, is applied by applying to the end.
  • the transformer 11 generates a compensating voltage Vcom across the secondary winding m2 according to the turns ratio Rr, and applies the compensating voltage Vcom to each phase of the three-phase power line 5 .
  • the compensation voltage Vcom which is the voltage superimposed on the u-phase, v-phase, and w-phase of the three-phase power line 5 via the secondary winding m2 of the transformer 11, exceeds the detection voltage Vsn.
  • Equation (9) indicates that the absolute value of the difference between the detection voltage Vsn and the compensation voltage Vcom is equal to or less than the allowable value Vto.
  • the noise filter 50 of the fifth embodiment does not increase the output voltage Vo output by one injection waveform generator 31, that is, the injection waveform generators 31a and 31b Without increasing the output voltages Vo1 and Vo2, the injection voltage Vinj whose maximum voltage is twice that of the control power sources 15a and 15b can be obtained.
  • the noise filter 50 of Embodiment 5 the size of the transformer 11 or the control power sources 15a and 15b can be reduced, and the noise filter 50 can be made smaller and lighter. Therefore, the first noise filter 50 of Embodiment 5 can suppress the common mode current, which is the current of the electromagnetic noise, while being compact and lightweight.
  • the output terminal 52a of the injection waveform generator 31a is connected to one end of the primary winding m1 of the transformer 11 and the input terminal 51b of the second injection waveform generator 31b, and the output terminal 52b of the second injection waveform generator 31b. may be connected to the other end of the primary winding m1 of the transformer 11.
  • the output voltage Vo1 of the first injection waveform generator 31a and the output voltage Vo2 of the second injection waveform generator 31b are voltages of the same magnitude and opposite phases.
  • the second injection waveform generator 31b uses the output Vo1 of the first injection waveform generator 31a. is entered.
  • the second injection waveform generator 31b employs a circuit that rotates the phase of the input signal by 180° with the same gain. That is, the gain Gi of the operational amplifier 19 of the second injection waveform generator 31b is -1 when the gain Gi of the first injection waveform generator 31a is positive, and the gain Gi of the first injection waveform generator 31a is 1 if is negative.
  • the second injection waveform generator 31b only needs to rotate the phase of the input signal by 180° with the same gain of the input signal. By connecting to the generator 31a, the band limiter 12 of the second injection waveform generator 31b can be removed.
  • the detection transformer 80 included in the noise detector 7 has two secondary windings m8a and m8b.
  • Output terminals 95a and 95b connected to the secondary windings m8a and m8b output adjusted voltages Vd1 and Vd2 of the same magnitude and opposite phase, and the adjusted voltage Vd1 is input to the first injection waveform generator 31a.
  • the adjustment voltage Vd2 may be input to the second injection waveform generator 31b.
  • the output voltage Vo1 of the first injection waveform generator 31a and the output voltage Vo2 of the second injection waveform generator 31b are voltages of the same magnitude and opposite phases.
  • the injection waveform generators 31a and 31b can be configured with circuits having the same gain and the same phase characteristics. That is, a common circuit can be used, and characteristic errors between the injection waveform generators 31a and 31b can be reduced.
  • the noise detector 7 has a primary winding m7 inserted in the three-phase power lines 5, 4 on the output side or the input side of the power converter 2, and two secondary windings m7.
  • a detection transformer 80 having side windings m8a, m8b is provided.
  • the first secondary winding m8a which is one of the secondary windings, is connected to the wiring 25, which is the reference wiring having one end at the reference potential Vss, and the other end is connected to the first adjustment voltage at the first adjustment voltage. It is connected to the first output terminal 95a that outputs one adjustment voltage Vd1.
  • the second secondary winding m8b which is the other secondary winding, has one end connected to the wiring 25, which is the reference wiring, and the other end outputs the second regulated voltage Vd2, which is the second regulated voltage. It is connected to the second output terminal 95b.
  • the injection voltage generator 30 includes a first injection waveform generator 31a that generates the first output voltage Vo1 based on the first adjustment voltage Vd1, and a second adjustment voltage Vd1. and a second injection waveform generator 31b for generating a second output voltage Vo2 based on Vd2.
  • the polarity of the first secondary winding m8a and the second secondary winding m8b of the detection transformer 80 is the same as that of the primary winding m7. may be different, and the number of turns may be different. That is, the adjustment voltages Vd1 and Vd2 may have different magnitudes and the same phase.
  • the injection waveform generators 31a and 31b to which they are input are set so as to output the output voltages Vo1 and Vo2 of the same magnitude and opposite phases.
  • the third noise filter 50 of the fifth embodiment can achieve That is, the injection voltage Vinj whose maximum voltage is twice that of the control power supplies 15a and 15b can be obtained without increasing the output voltages Vo1 and Vo2 of the injection waveform generators 31a and 31b.
  • the size of the transformer 11 or the control power sources 15a and 15b can be reduced, so that the noise filter 50 can be reduced in size and weight.
  • the output voltage Vo1 and the output voltage Vo2 have the same magnitude, but as in the first embodiment, the output voltage Vo1 and the output voltage Vo2 may have different magnitudes. Even if the magnitudes are different, the difference between the output voltage Vo1 and the output voltage Vo2, that is, the injection voltage Vinj, which is the same-phase voltage that is larger than the output voltage Vo1, is applied to the primary winding m1 of the transformer 11 .
  • the noise filter 50 of Embodiment 5 the size of the transformer 11 or the control power sources 15a and 15b can be reduced, and the noise filter 50 can be made smaller and lighter.
  • the noise filter 50 of the fifth embodiment shown in FIGS. 25 to 27 has a feedforward configuration, it can also have a feedback configuration by exchanging the positions of the transformer 11 and the noise detector 7.
  • FIG. 25 to 27 has a feedforward configuration, it can also have a feedback configuration by exchanging the positions of the transformer 11 and the noise detector 7.
  • the noise filter 50 of Embodiment 5 is a noise filter that reduces the voltage or current of electromagnetic noise generated by the power converter 2 that converts power by switching operations of the semiconductor elements Q1 to Q6.
  • the noise filter 50 detects a voltage (detected voltage Vsn) based on the electromagnetic noise generated by the power converter 2, and outputs an adjusted voltage Vd obtained by adjusting the voltage (detected voltage Vsn) based on the electromagnetic noise.
  • a compensating signal applicator 75 that superimposes a compensating voltage Vcom having a polarity opposite to the voltage based on electromagnetic noise (detected voltage Vsn) on the output or input of the power converter 2 via the transformer 11; generating a first output voltage Vo1 for generating an injection voltage Vinj between one end and the other end of the primary winding m1 and a second output voltage Vo2 having a polarity opposite to the first output voltage Vo1 based on the adjustment voltage Vd; an injection voltage generator 30 that outputs the first output voltage Vo1 to one end of the primary winding m1 of the transformer 11 and outputs the second output voltage Vo2 to the other end of the primary winding m1 of the transformer 11; there is The injection voltage generator 30 generates an injection voltage Vinj in which the difference between the compensation voltage Vcom superimposed by the compensation signal applicator 75 and the voltage (detection voltage Vsn) based on the electromagnetic noise is equal to or less than the allowable value Vto.
  • the noise detector 7 includes a detection transformer 80 having a primary winding m7 inserted in the power line (three-phase power lines 5, 4) on the output side or the input side of the power converter 2.
  • the secondary winding of the detection transformer 80 is One end of the line m8 is connected to the reference line (line 25) having the reference potential Vss, and the other end is connected to the output terminal 95 that outputs the adjustment voltage Vd.
  • the noise filter 50 of Embodiment 5 applies the first output voltage Vo1 and the second output voltage opposite in polarity to the first output voltage Vo1 to both ends of the primary winding m1 of the transformer 11 of the compensation signal applicator 75, respectively.
  • the compensating voltage Vcom is superimposed on the output or input of the power converter 2 based on the injection voltage Vinj that has the same polarity as the first output voltage Vo1 and is larger than the first output voltage Vo1. can enhance the noise reduction effect.
  • FIG. 28 is a diagram showing the configuration of a first noise filter and a motor drive system according to the sixth embodiment
  • FIG. 29 is a diagram showing the configuration of a second noise filter and a motor drive system according to the sixth embodiment.
  • FIG. 30 is a diagram showing the configuration of a third noise filter and motor drive system according to the sixth embodiment.
  • the noise filter 50 of Embodiment 6 is a system for controlling an induction motor 3 by a power converter 2 such as a voltage-type PWM inverter in which a plurality of semiconductor elements perform switching operations, as in Embodiment 1. can be applied to
  • the noise detector 7 is provided with a detection transformer 80, and the injection waveform generators are the same injection waveform generators 31a and 31b of FIGS. , and is different from the noise filter 50 of the first embodiment in that a signal adjusting transformer 71 and a signal applicator 72 are provided instead of the transformer 11 .
  • the noise filter 50 of Embodiment 6 differs from the noise filter 50 of Embodiment 5 in that it includes a signal adjustment transformer 71 and a signal applicator 72 instead of the transformer 11 . Differences from the noise filter 50 of Embodiment 5 will be mainly described.
  • FIG. 28 shows an example in which the noise detector 7 and the signal applicator 72 are connected to the three-phase power line 5 .
  • the output voltage Vo1 output from the output terminal 52a of the injection waveform generator 31a is input to one end of the primary winding m5 of the signal adjustment transformer 71.
  • the output voltage Vo2 output from the output terminal 52b of the injection waveform generator 31b is input to the other end of the primary winding m5 of the signal adjustment transformer 71.
  • the output voltage Vo1 and the output voltage Vo2 are voltages of the same magnitude and opposite phases. That is, the output voltage Vo1 and the output voltage Vo2 are voltages of the same magnitude and opposite polarities.
  • an injection voltage Vinj which is the difference between the output voltage Vo1 and the output voltage Vo2, that is, is twice as large as Vo1 and has the same phase, ie, the same polarity
  • the compensation voltage Vcom is applied to each phase of the three-phase power line 5 via the capacitor 73 of the signal applicator 72 so that the common mode current, which is the current of electromagnetic noise, is suppressed, that is, the detection voltage Vsn, which is the voltage based on the electromagnetic noise. is superimposed so as to suppress A current that suppresses the detection voltage Vsn, which is a voltage based on electromagnetic noise, flows through each phase of the three-phase power line 5 via the capacitor 73 of the signal applicator 72 .
  • a first noise filter 50 according to the sixth embodiment includes an injection waveform generator 31a and an injection waveform generator 31b.
  • the difference between the output voltage Vo1 and the output voltage Vo2 that is, an injection voltage Vinj having the same phase as the difference between the output voltage Vo1 and the output voltage Vo2 is applied to the primary winding m5 of the signal adjustment transformer 71. be. That is, the first noise filter 50 of Embodiment 6 does not increase the output voltage Vo output by one injection waveform generator 31, that is, the output voltages Vo1 and Vo2 of the injection waveform generators 31a and 31b are reduced to An injection voltage Vinj whose maximum voltage is twice that of the control power sources 15a and 15b can be obtained without increasing the voltage, as shown in Equation (6).
  • the size of the signal conditioning transformer 71 or the control power sources 15a and 15b can be reduced. Mode current can be suppressed. Therefore, the first noise filter 50 of Embodiment 6 can suppress the common mode current, which is the current of electromagnetic noise, while being compact and lightweight.
  • the output terminal 52a of the injection waveform generator 31a is connected to one end of the primary winding m5 of the signal conditioning transformer 71 and the input terminal 51b of the second injection waveform generator 31b.
  • the terminal 52b may be connected to the other end of the primary winding m5 of the signal conditioning transformer 71.
  • the output voltage Vo1 of the first injection waveform generator 31a and the output voltage Vo2 of the second injection waveform generator 31b are voltages of the same magnitude and opposite phases.
  • the second injection waveform generator 31b is the output of the first injection waveform generator 31a, Vo1 is entered.
  • the second injection waveform generator 31b employs a circuit that rotates the phase of the input signal by 180° with the same gain. That is, the gain Gi of the operational amplifier 19 of the second injection waveform generator 31b is -1 when the gain Gi of the first injection waveform generator 31a is positive, and the gain Gi of the first injection waveform generator 10a is 1 if is negative.
  • the band limiter 12 can generate the first injection waveform By connecting to the generator 31a, the band limiter 12 of the second injection waveform generator 31b can be removed.
  • Output terminals 95a and 95b connected to the secondary windings m8a and m8b output adjusted voltages Vd1 and Vd2 of the same magnitude and opposite phase, and the adjusted voltage Vd1 is input to the first injection waveform generator 31a.
  • the adjustment voltage Vd2 may be input to the second injection waveform generator 31b.
  • the detection transformer 80 and the injection waveform generators 31a and 31b in the third noise filter 50 of the sixth embodiment are the same as the detection transformer 80 and the injection waveform generators 31a and 31b in the third noise filter 50 of the fifth embodiment. is.
  • the output voltage Vo1 of the first injection waveform generator 31a and the output voltage Vo2 of the second injection waveform generator 31b are voltages of the same magnitude and opposite phases.
  • the injection waveform generators 31a and 31b can be configured with circuits having the same gain and the same phase characteristics. That is, a common circuit can be used, and characteristic errors between the injection waveform generators 31a and 31b can be reduced.
  • the polarity of the first secondary winding m8a and the second secondary winding m8b of the detection transformer 80 is the same as that of the primary winding m7. may be different, and the number of turns may be different. That is, the adjustment voltages Vd1 and Vd2 may have different magnitudes and the same phase.
  • the injection waveform generators 31a and 31b to which they are input are set so as to output the output voltages Vo1 and Vo2 of the same magnitude and opposite phases.
  • the third noise filter 50 of the sixth embodiment can achieve That is, the injection voltage Vinj whose maximum voltage is twice that of the control power supplies 15a and 15b can be obtained without increasing the output voltages Vo1 and Vo2 of the injection waveform generators 31a and 31b.
  • the signal adjustment transformer 71 or the control power sources 15a and 15b can be made smaller, and the noise filter 50 can be made smaller and lighter.
  • the output voltage Vo1 and the output voltage Vo2 have the same magnitude, but as in the first embodiment, the output voltage Vo1 and the output voltage Vo2 may have different magnitudes. Even if the magnitudes are different, the difference between the output voltage Vo1 and the output voltage Vo2, that is, the injection voltage Vinj that is larger than Vo1 and in phase is applied to the primary winding m5 of the signal conditioning transformer 71 .
  • the noise filter 50 of Embodiment 6 the size of the signal adjustment transformer 71 or the control power sources 15a and 15b can be reduced, and the noise filter 50 can be reduced in size and weight.
  • the noise filter 50 of the sixth embodiment shown in FIGS. 28 to 30 has a feedforward configuration, the positions of the signal applicator 72 and the signal adjustment transformer 71, that is, the compensation signal applicator 75 and the noise detector 7 are exchanged. However, it can also be a feedback configuration.
  • FIG. 31 is a diagram showing the configuration of a first noise filter and motor drive system according to Embodiment 7, and FIG. 32 is a diagram showing the injection waveform generator of FIG.
  • FIG. 33 is a diagram showing the configuration of a second noise filter according to Embodiment 7, and
  • FIG. 34 is a diagram showing the injection waveform generator of FIG. 35 is a diagram showing the configuration of a third noise filter according to the seventh embodiment, and
  • FIG. 36 is a diagram showing the configuration of a fourth noise filter according to the seventh embodiment.
  • 37 is a diagram showing a configuration of a fifth noise filter according to Embodiment 7.
  • FIG. 38 is a diagram showing the configuration of a sixth noise filter according to the seventh embodiment, and FIG.
  • the noise filter 50 of Embodiment 7 is a system for controlling an induction motor 3 by a power converter 2 such as a voltage-type PWM inverter in which a plurality of semiconductor elements perform switching operations, as in Embodiment 1. can be applied to a power converter 2 such as a voltage-type PWM inverter in which a plurality of semiconductor elements perform switching operations, as in Embodiment 1. can be applied to a power converter 2 such as a voltage-type PWM inverter in which a plurality of semiconductor elements perform switching operations, as in Embodiment 1. can be applied to
  • Electromagnetic noise generated by the switching operation of semiconductor devices may contain differential mode components different from common mode components.
  • a differential mode component of electromagnetic noise is generated independently in each phase of the three-phase power line 5 , each phase of the three-phase power line 4 , and each wiring of the DC bus of the power converter 2 .
  • the DC bus of the power converter 2 is the high potential side wiring 44p and the low potential side wiring 44s. 31, 33, 35, and 36 show examples of suppressing electromagnetic noise for each phase of the three-phase power line 5.
  • FIG. 37 and 39 show an example of suppressing electromagnetic noise for each wiring of the DC bus of the power converter 2 .
  • FIG. 38 shows an example of suppressing electromagnetic noise for two single-phase power lines 45 .
  • Embodiment 7 describes an example of a noise filter 50 that detects differential mode component voltage or current in electromagnetic noise and suppresses them.
  • the first noise filter 50 of Embodiment 7 includes noise detectors 7u, 7v, and 7w for each phase of the three-phase power line 5, injection voltage generators 30u, 30v, and 30w, a compensation signal applicator 75u, It differs from the noise filter 50 of the first embodiment in that it includes 75v and 75w. Differences from the noise filter 50 of Embodiment 1 will be mainly described.
  • the configuration for suppressing the differential mode voltage Vdi3 of the phase, that is, the three-phase power line 5w is the same.
  • the injection voltage generator 30 shown in FIG. 32 can be applied to the injection voltage generators 30u, 30v, and 30w.
  • the injection voltage generator 30 includes the injection waveform generators 10a and 10b described in the first embodiment.
  • a configuration for suppressing the differential mode voltage Vdi1 of the u-phase of the three-phase power line 5, that is, the three-phase power line 5u will be described as a representative.
  • the noise detector 7u for detecting the differential mode voltage Vdi1 includes a capacitor 8u and a signal adjustment circuit 9u connected in series between the three-phase power line 5u on the output side of the power converter 2 and the wiring 24, which is the ground wiring. ing.
  • the signal adjustment circuit 9u outputs the adjusted voltage Vdo1 obtained by dividing the differential mode voltage Vdi1, which is the input voltage between the wiring 24 and the input terminal 94, which is at the ground potential, or band-limiting or both. Output.
  • Noise detector 7u detects differential mode voltage Vdi1 and outputs adjusted voltage Vdo1 based on differential mode voltage Vdi1.
  • the noise detector 7u includes a capacitor 8u and a signal adjustment circuit 9u connected in series between the three-phase power line 5u on the output side of the power converter 2 and the wiring 24, which is the ground wiring. Then, the signal adjustment circuit 9u outputs the adjusted voltage Vdo1 based on the input voltage, that is, the differential mode voltage Vdi1, which is input through the capacitor 8u.
  • the input terminals 51a and 51b of the injection voltage generator 30u are connected to the output terminal 95 of the signal adjustment circuit 9u by the input wiring 33u.
  • the output terminal 52a of the injection voltage generator 30u is connected to one end of the primary winding m1 of the transformer 11u of the compensation signal applicator 75u through the output wiring 34u, and the output terminal 52b of the injection voltage generator 30u is connected through the output wiring 35u. It is connected to the other end of the primary winding m1 of the transformer 11u of the compensation signal applicator 75u.
  • the adjustment voltage Vdo1 is input to the input terminals 51a and 51b of the injection voltage generator 30u, that is, the input terminals 51a and 51b of the injection waveform generators 10a and 10b.
  • the injection voltage generator 30 includes a first injection waveform generator 10a that generates the first output voltage Vo1 based on the regulated voltage Vdo1, and a second injection waveform generator 10a that generates the second output voltage Vo2 based on the regulated voltage Vdo1. and a generator 10b.
  • the injection waveform generators 10a and 10b Based on the input adjustment voltage Vdo1, the injection waveform generators 10a and 10b output band-limited and amplified voltages, that is, output voltages Vo1 and Vo2 from the output terminals 52a and 52b.
  • the output voltage Vo1 output from the output terminal 52a of the injection waveform generator 10a is input to one end of the primary winding m1 of the transformer 11u through the output wiring 34u.
  • the output voltage Vo2 output from the output terminal 52b of the injection waveform generator 10b is input to the other end of the primary winding m1 of the transformer 11u through the output wiring 35u.
  • the output voltage Vo1 and the output voltage Vo2 are voltages of the same magnitude and opposite phases.
  • the output voltage Vo1 and the output voltage Vo2 are voltages of the same magnitude and opposite polarities.
  • a difference between the output voltage Vo1 and the output voltage Vo2, that is, a voltage of twice the magnitude of Vo1 and having the same phase, that is, the same polarity, is applied to the primary winding m1 of the transformer 11u.
  • FIG. 32 shows the input wiring 33, the output wiring 34 connected to one end of the primary winding m1 of the transformer, and the output wiring 35 connected to the other end of the primary winding m1 of the transformer.
  • the input wiring 33 and the output wirings 34 and 35 of the injection voltage generator 30 are denoted by u and are denoted as the input wiring 33u and the output wirings 34u and 35u.
  • the input wiring 33 and the output wirings 34 and 35 of the injection voltage generator 30 are denoted by the symbol v and are denoted as the input wiring 33v and the output wirings 34v and 35v.
  • the input wiring 33 and the output wirings 34 and 35 of the injection voltage generator 30 are denoted by w, and are denoted as an input wiring 33w and output wirings 34w and 35w.
  • the transformer 11u has a primary side winding m1 and a secondary side winding m2 on the primary side and the secondary side, respectively.
  • a secondary winding m2 of the transformer 11u is inserted in the three-phase power line 5u.
  • the difference between the output voltage Vo1 output from the injection waveform generator 10a of the injection voltage generator 30u and the output voltage Vo2 output from the injection waveform generator 10b of the injection voltage generator 30u, that is, the injection voltage Vinj1 is the transformer 11u.
  • a compensation voltage Vdm1 which is applied to the primary winding m1, has a polarity opposite to that of the differential mode voltage Vdi1, and is a voltage corresponding to the turns ratio Rr between the primary winding m1 and the secondary winding m2, is applied to the secondary winding. occurs on line m2.
  • Compensation voltage Vdm1 is a superimposed voltage that is superimposed on three-phase power line 5u.
  • the output voltage Vo1 output by the injection waveform generator 10a and the output voltage Vo2 output by the injection waveform generator 10b are voltages of the same magnitude and opposite in phase to each other.
  • the transformer 11u generates a compensating voltage Vdm1 across the secondary winding m2 according to the turns ratio Rr, and applies the compensating voltage Vdm1 to the u-phase of the three-phase power line 5.
  • Equation (10) indicates that the absolute value of the difference between differential mode voltage Vdi1 and compensation voltage Vdm1 is less than or equal to allowable value Vto.
  • the configuration for suppressing the differential mode voltage Vdi2 of the v-phase of the three-phase power line 5, that is, the three-phase power line 5v, is the same as the configuration for suppressing the differential mode voltage Vdi1 of the three-phase power line 5u. Therefore, the symbols 7u, 8u, 9u, 30u, 33u, 34u, 35u, 75u, and 11u of the components are replaced with 7v, 8v, 9v, 30v, 33v, 34v, 35v, 75v, and 11v, respectively. Also, the symbols Vdi1, Vdo1, Vinj1, and Vdm1 of each voltage are replaced with Vdi2, Vdo2, Vinj2, and Vdm2, respectively.
  • the configuration for suppressing the differential mode voltage Vdi3 of the w-phase of the three-phase power line 5, that is, the three-phase power line 5w, is the same as the configuration for suppressing the differential mode voltage Vdi1 of the three-phase power line 5u. Therefore, the reference numerals 7u, 8u, 9u, 30u, 33u, 34u, 35u, 75u, and 11u of the components are replaced with 7w, 8w, 9w, 30w, 33w, 34w, 35w, 75w, and 11w, respectively. Also, the symbols Vdi1, Vdo1, Vinj1, and Vdm1 of the respective voltages are replaced with Vdi3, Vdo3, Vinj3, and Vdm3, respectively.
  • the output voltage Vo2 output by the injection waveform generator 10b of 30W is a voltage of the same magnitude but opposite in phase.
  • injection voltages Vinj1, Vinj2, and Vinj3, which are the differences, are applied.
  • the transformers 11u, 11v, and 11w generate compensation voltages Vdm1, Vdm2, and Vdm3 across the secondary winding m2 according to the turns ratio Rr, and apply the compensation voltages Vdm1, Vdm2, and Vdm3 to the respective phases of the three-phase power line 5. do.
  • the first noise filter 50 of the seventh embodiment does not increase the output voltage Vo output by one injection waveform generator 10, that is, each injection waveform generator Injection voltages Vinj1, Vinj2, and Vinj3 whose maximum voltage is twice that of the control power sources 15a and 15b can be obtained without increasing the output voltages Vo1 and Vo2 of 10a and 10b.
  • the transformers 11u, 11v, 11w or the control power supplies 15a, 15b can be made smaller, and the noise filter 50 can be made smaller and lighter. Therefore, the first noise filter 50 of Embodiment 7 can suppress the differential mode voltages Vdi1, Vdi2, and Vdi3 while being compact and lightweight, that is, can enhance the noise reduction effect while being compact and lightweight.
  • the second noise filter 50 of Embodiment 7 includes noise detectors 7u, 7v, and 7w for each phase of the three-phase power line 5, injection voltage generators 39u, 39v, and 39w, a compensation signal applicator 75u, It differs from the noise filter 50 of the second embodiment in that it has 75v and 75w. Note that the compensating signal applicators 75u, 75v, and 75w are omitted in FIG. Differences from the noise filter 50 of the second embodiment and the first noise filter 50 of the seventh embodiment are mainly described.
  • the configuration for suppressing the differential mode voltage Vdi3 of the phase, that is, the three-phase power line 5w is the same.
  • the injection voltage generator 39 shown in FIG. 34 can be applied to the injection voltage generators 39u, 39v, and 39w.
  • the injection voltage generator 39 includes the injection waveform generators 31a and 31b described in the second embodiment.
  • a configuration for suppressing the differential mode voltage Vdi1 of the u-phase of the three-phase power line 5, that is, the three-phase power line 5u will be described as a representative.
  • the noise detector 7u that detects the differential mode voltage Vdi1 includes a capacitor 8u and a voltage dividing transformer 70u that are connected in series between the three-phase power line 5u on the output side of the power converter 2 and the wiring 24 that is the ground wiring. ing. One end of the primary winding m3 of the voltage dividing transformer 70u is connected via an input terminal 94 to one end of the capacitor 8u opposite to the three-phase power line 5u, and the other end is connected to the wiring 24 which is the ground wiring. .
  • One end of the secondary winding m4 of the voltage dividing transformer 70u is connected to the wiring 25 which is a reference wiring having a reference potential Vss different from the ground potential of the wiring 24 which is the ground wiring, and the other end is connected to the adjustment voltage Vdo1. It is connected to an output terminal 95 for output.
  • the noise detector 7u outputs an adjusted voltage Vdo1 based on the input voltage, that is, the differential mode voltage Vdi1, which is input to the voltage dividing transformer 70u through the capacitor 8u.
  • the input terminals 51a and 51b of the injection voltage generator 39u are connected to the output terminal 95 of the signal adjustment circuit 9u by the input wiring 33u.
  • the output terminal 52a of the injection voltage generator 39u is connected to one end of the primary winding m1 of the transformer 11u of the compensation signal applicator 75u through the output wiring 34u, and the output terminal 52b of the injection voltage generator 39u is connected through the output wiring 35u. It is connected to the other end of the primary winding m1 of the transformer 11u of the compensation signal applicator 75u.
  • the adjustment voltage Vdo1 is input to the input terminals 51a and 51b of the injection voltage generator 39u, that is, the input terminals 51a and 51b of the injection waveform generators 31a and 31b.
  • the injection voltage generator 39 includes a first injection waveform generator 31a that generates the first output voltage Vo1 based on the regulated voltage Vdo1, and a second injection waveform generator 31a that generates the second output voltage Vo2 based on the regulated voltage Vdo1. and a generator 31b.
  • the injection waveform generators 31a and 31b Based on the input adjustment voltage Vdo1, the injection waveform generators 31a and 31b output band-limited and amplified voltages, that is, output voltages Vo1 and Vo2 from the output terminals 52a and 52b.
  • the output voltage Vo1 output from the output terminal 52a of the injection waveform generator 31a is input to one end of the primary winding m1 of the transformer 11u through the output wiring 34u.
  • the output voltage Vo2 output from the output terminal 52b of the injection waveform generator 31b is input to the other end of the primary winding m1 of the transformer 11u through the output wiring 35u.
  • the output voltage Vo1 and the output voltage Vo2 are voltages of the same magnitude and opposite phases.
  • the output voltage Vo1 and the output voltage Vo2 are voltages of the same magnitude and opposite polarities.
  • a difference between the output voltage Vo1 and the output voltage Vo2, that is, a voltage of twice the magnitude of Vo1 and having the same phase, that is, the same polarity, is applied to the primary winding m1 of the transformer 11u.
  • FIG. 34 shows an input wiring 33, an output wiring 34 connected to one end of the primary winding m1 of the transformer, and an output wiring 35 connected to the other end of the primary winding m1 of the transformer.
  • the input wiring 33 and the output wirings 34 and 35 of the injection voltage generator 39 are denoted by u and are denoted as the input wiring 33u and the output wirings 34u and 35u.
  • the input wiring 33 and the output wirings 34 and 35 of the injection voltage generator 39 are denoted by the symbol v and are denoted as the input wiring 33v and the output wirings 34v and 35v.
  • the input wiring 33 and the output wirings 34 and 35 of the injection voltage generator 39 are denoted by w, and are denoted as the input wiring 33w and the output wirings 34w and 35w.
  • a compensating voltage Vdm1 which is applied to the primary winding m1, has a polarity opposite to the differential mode voltage Vdi1, and is a voltage corresponding to the turns ratio between the primary winding m1 and the secondary winding m2, is applied to the secondary winding. occurs at m2.
  • Compensation voltage Vdm1 is a superimposed voltage that is superimposed on three-phase power line 5u.
  • the configuration for suppressing the differential mode voltage Vdi2 of the v-phase of the three-phase power line 5, that is, the three-phase power line 5v, is the same as the configuration for suppressing the differential mode voltage Vdi1 of the three-phase power line 5u. Therefore, the symbols 7u, 8u, 70u, 39u, 33u, 34u, 35u, 75u, and 11u of the respective components are read as 7v, 8v, 70v, 39v, 33v, 34v, 35v, 75v, and 11v, respectively. Also, the symbols Vdi1, Vdo1, Vinj1, and Vdm1 of each voltage are replaced with Vdi2, Vdo2, Vinj2, and Vdm2, respectively.
  • the configuration for suppressing the differential mode voltage Vdi3 of the w-phase of the three-phase power line 5, that is, the three-phase power line 5w, is the same as the configuration for suppressing the differential mode voltage Vdi1 of the three-phase power line 5u. Therefore, the reference numerals 7u, 8u, 70u, 39u, 33u, 34u, 35u, 75u, and 11u of the components are replaced with 7w, 8w, 70w, 39w, 33w, 34w, 35w, 75w, and 11w, respectively. Also, the symbols Vdi1, Vdo1, Vinj1, and Vdm1 of the respective voltages are replaced with Vdi3, Vdo3, Vinj3, and Vdm3, respectively.
  • the output voltage Vo2 output by the injection waveform generator 31b of 39w has the same magnitude and the opposite phase.
  • injection voltages Vinj1, Vinj2, and Vinj3, which are the differences, are applied.
  • the transformers 11u, 11v, and 11w generate compensation voltages Vdm1, Vdm2, and Vdm3 across the secondary winding m2 according to the turns ratio Rr, and apply the compensation voltages Vdm1, Vdm2, and Vdm3 to the respective phases of the three-phase power line 5. do.
  • the second noise filter 50 of the seventh embodiment does not increase the output voltage Vo output by one injection waveform generator 31, that is, each injection waveform generator Injection voltages Vinj1, Vinj2, and Vinj3 whose maximum voltage is twice that of the control power sources 15a and 15b can be obtained without increasing the output voltages Vo1 and Vo2 of 31a and 31b.
  • the size of the transformers 11u, 11v, 11w or the control power supplies 15a, 15b can be reduced, and the noise filter 50 can be made smaller and lighter. Therefore, the second noise filter 50 of Embodiment 7 can suppress the differential mode voltages Vdi1, Vdi2, and Vdi3 while being compact and lightweight, that is, can enhance the noise reduction effect while being compact and lightweight.
  • the noise detectors 7u, 7v and 7w may be provided with detection transformers 80u, 80v and 80w like the third noise filter 50 of the seventh embodiment shown in FIG. 35, for example.
  • the third noise filter 50 of Embodiment 7 includes noise detectors 7u, 7v, and 7w for each phase of the three-phase power line 5, injection voltage generators 39u, 39v, and 39w, a compensation signal applicator 75u, It differs from the noise filter 50 of the fifth embodiment in that it has 75v and 75w. Note that the compensating signal applicators 75u, 75v, and 75w are omitted in FIG. Differences from the noise filter 50 of the fifth embodiment and the second noise filter 50 of the seventh embodiment will be mainly described.
  • the configuration and the configuration for suppressing the differential mode current in the electromagnetic noise current in the w-phase of the three-phase power line 5, that is, in the three-phase power line 5w, are the same.
  • the injection voltage generator 39 shown in FIG. 34 can be applied to the injection voltage generators 39u, 39v, and 39w.
  • a configuration for suppressing the differential mode current in the current of electromagnetic noise in the u-phase of the three-phase power line 5, that is, in the three-phase power line 5u will be described as a representative.
  • the noise detector 7u detects the current of electromagnetic noise in the same way as the noise filter 50 of the fifth embodiment. Specifically, the noise detector 7u detects the current of the differential mode component in the electromagnetic noise.
  • the noise detector 7u includes a detection transformer 80u having a primary winding m7 inserted into the three-phase power line 5u on the output side of the power converter 2.
  • FIG. One end of the secondary winding m8 of the detection transformer 80u is connected to the wiring 25 which is the reference wiring having the reference potential Vss, and the other end is connected to the output terminal 95 for outputting the adjustment voltage Vdo1.
  • the detection transformer 80u includes a primary-side primary winding m7 and a secondary-side secondary winding m8.
  • FIG. 35 shows an example in which the primary winding m7 of the detection transformer 80u is inserted into the three-phase power line 5u.
  • the detection transformer 80u converts the detection voltage Vdsn1 applied across the primary winding m7 to This voltage is output from the output terminal 95 to the injection waveform generators 31a and 31b of the injection voltage generator 39u as the adjustment voltage Vdo1, which is the output of the noise detector 7u.
  • the output voltage Vo1 output by the injection waveform generator 31a and the output voltage Vo2 output by the injection waveform generator 31b are voltages of the same magnitude and opposite in phase to each other.
  • An injection voltage Vinj1 which is the difference, is applied by applying it to one end and the other end of the winding m1.
  • the transformer 11u generates a compensating voltage Vdm1 across the secondary winding m2 according to the turns ratio Rr, and applies the compensating voltage Vdm1 to the u-phase of the three-phase power line 5.
  • the third noise filter 50 of Embodiment 7 is configured such that the compensation voltage Vdm1, which is the voltage superimposed on the u-phase of the three-phase power line 5 via the secondary winding m2 of the transformer 11u, reduces the detected voltage Vdsn1. , that is, the gain Gi and the turns ratio Rr are set so that the equation (11) holds.
  • Vto is the allowable voltage difference. Equation (11) indicates that the absolute value of the difference between the detection voltage Vdsn1 and the compensation voltage Vdm1 is less than or equal to the allowable value Vto.
  • the configuration for suppressing the differential mode current in the electromagnetic noise current in the v phase of the three-phase power line 5, that is, the three-phase power line 5v, is the same as the configuration for suppressing the differential mode current in the electromagnetic noise current in the three-phase power line 5u. Therefore, the symbols 7u, 80u, 39u, 33u, 34u, 35u, 75u, and 11u of the components are replaced with 7v, 80v, 39v, 33v, 34v, 35v, 75v, and 11v, respectively. Also, the symbols Vdsn1, Vdo1, Vinj1, and Vdm1 of the voltages are replaced with Vdsn2, Vdo2, Vinj2, and Vdm2, respectively.
  • the configuration for suppressing the differential mode current in the electromagnetic noise current in the w phase of the three-phase power line 5, that is, the three-phase power line 5w is the same as the configuration for suppressing the differential mode current in the electromagnetic noise current in the three-phase power line 5u. . Therefore, the reference numerals 7u, 80u, 39u, 33u, 34u, 35u, 75u, and 11u of the components are replaced with 7w, 80w, 39w, 33w, 34w, 35w, 75w, and 11w, respectively. Also, the symbols Vdsn1, Vdo1, Vinj1, and Vdm1 of the voltages are replaced with Vdsn3, Vdo3, Vinj3, and Vdm3, respectively.
  • the third noise filter 50 of Embodiment 7 can suppress the differential current in the electromagnetic noise current while being compact and lightweight, that is, it can enhance the noise reduction effect while being compact and lightweight.
  • Capacitors 73u, 73v, 73w may be provided.
  • the fourth noise filter 50 of Embodiment 7 includes noise detectors 7u, 7v, 7w and injection voltage generators 30u, 30v, 30w or injection voltage generators 39u, 39v for each phase of the three-phase power line 5. , 39w, and compensation signal applicators 75u, 75v, 75w. Although noise detectors 7u, 7v, and 7w are omitted in FIG. can be done. 36, injection voltage generators 30u, 30v, and 30w to which noise detectors 7u, 7v, and 7w in first noise filter 50 of Embodiment 7 are applied are described.
  • the fourth noise filter 50 of Embodiment 7 includes injection voltage generators 30u, 30v, 30w Injection voltage generators 39u, 39v and 39w are provided instead. Differences from the noise filter 50 of the third or fourth embodiment and the first noise filter 50 of the seventh embodiment are mainly described.
  • a configuration for suppressing the differential mode voltage Vdi1 or the differential mode current of the u-phase of the three-phase power line 5, that is, the differential mode voltage Vdi1 of the three-phase power line 5u, and the differential mode voltage Vdi2 or the differential mode current of the v-phase, that is, the three-phase power line 5v of the three-phase power line 5 is suppressed.
  • the configuration and the configuration for suppressing the differential mode voltage Vdi3 or the differential mode current of the w-phase of the three-phase power line 5, that is, the three-phase power line 5w, are the same.
  • the configuration for suppressing the differential mode current is the case where the noise detectors 7u, 7v, and 7w in the third noise filter 50 of the seventh embodiment are applied.
  • a configuration for suppressing the differential mode voltage Vdi1 or the differential mode current of the u-phase of the three-phase power line 5, that is, the three-phase power line 5u will be described as a representative.
  • the compensation signal applicator 75u includes a signal adjustment transformer 71u having a primary winding m5 and a secondary winding m6 on the primary and secondary sides, respectively, and a capacitor 73u.
  • Capacitor 73u corresponds to signal applicator 72 in three-phase power line 5u described in the third embodiment.
  • One end of the secondary winding m6 of the signal adjustment transformer 71u is connected to the wiring 24 which is the ground wiring, and the other end is connected to the three-phase power line 5u on the output side of the power converter 2 via the capacitor 73u.
  • FIG. 36 shows an example in which the compensation signal applicator 75u is connected to the three-phase power line 5u.
  • the output terminals 52a and 52b of the injection voltage generator 30u are connected to both ends of the primary winding m5, respectively, and one end of the secondary winding m6 is connected to the wiring 24 having the ground potential. , the other end of which is connected to the side of the capacitor 73u opposite to the three-phase power line 5u.
  • the output voltage Vo1 output from the output terminal 52a of the injection waveform generator 10a of the injection voltage generator 30u is input to one end of the primary winding m5 of the signal adjustment transformer 71u.
  • the output voltage Vo2 output from the output terminal 52b of the injection waveform generator 10b of the injection voltage generator 30u is input to the other end of the primary winding m5 of the signal adjustment transformer 71u.
  • the output voltage Vo1 and the output voltage Vo2 are voltages of the same magnitude and opposite phases. That is, the output voltage Vo1 and the output voltage Vo2 are voltages of the same magnitude and opposite polarities.
  • An injection voltage Vinj1 which is the difference between the output voltage Vo1 and the output voltage Vo2, that is, twice the magnitude of Vo1 and having the same phase, that is, the same polarity, is applied to the primary winding m5 of the signal adjustment transformer 71u.
  • Compensation voltage Vdm1 is superimposed on three-phase power line 5u via capacitor 73u so as to suppress differential mode voltage Vdi1.
  • the compensation voltage Vdm1 is superimposed on the three-phase power line 5u through the capacitor 73u so as to suppress the detection voltage Vdsn1, which is proportional to the differential mode current.
  • a differential mode voltage Vdi1 or a current that suppresses the differential mode current flows through the three-phase power line 5u via the capacitor 73u.
  • the configuration for suppressing the differential mode voltage Vdi2 or the differential mode current of the v-phase of the three-phase power line 5, that is, the differential mode voltage Vdi2 of the three-phase power line 5v suppresses the differential mode voltage Vdi1 or the differential mode current of the u-phase of the three-phase power line 5, that is, the three-phase power line 5u. It is the same as the configuration for The configuration for suppressing the differential mode voltage Vdi2 of the three-phase power line 5v is the reference numerals 7u, 8u, 9u or 70u, 30u or 39u, 33u, and 34u of the components in the configuration for suppressing the differential mode voltage Vdi1 of the three-phase power line 5u.
  • 35u, 75u, 71u and 73u are read as 7v, 8v, 9v or 70v, 30v or 39v, 33v, 34v, 35v, 75v, 71v and 73v, respectively.
  • the configuration for suppressing the differential mode current of the three-phase power line 5v is represented by reference numerals 7u, 80u, 39u, 33u, 34u, 35u, 75u, 71u, and 73u of the components in the configuration for suppressing the differential mode current of the three-phase power line 5u. are read as 7v, 80v, 39v, 33v, 34v, 35v, 75v, 71v, and 73v, respectively.
  • the symbols Vdi1 or Vdsn1, Vdo1, Vinj1, and Vdm1 of each voltage are replaced with Vdi2, Vdsn2, Vdo2, Vinj2, and Vdm2, respectively.
  • 35u, 75u, 71u and 73u are read as 7w, 8w, 9w or 70w, 30w or 39w, 33w, 34w, 35w, 75w, 71w and 73w, respectively.
  • the configuration for suppressing the differential mode current of the three-phase power line 5w is represented by the reference numerals 7u, 80u, 39u, 33u, 34u, 35u, 75u, 71u, and 73u of the components in the configuration for suppressing the differential mode current of the three-phase power line 5u. are read as 7w, 80w, 39w, 33w, 34w, 35w, 75w, 71w, and 73w, respectively.
  • the symbols Vdi1 or Vdsn1, Vdo1, Vinj1, and Vdm1 of each voltage are read as Vdi3, Vdsn3, Vdo3, Vinj3, and Vdm3, respectively.
  • the fourth noise filter 50 of Embodiment 7 includes the injection waveform generator 10a, the injection waveform generator 10b, or the injection voltage generator 30u, 30v, and 30w corresponding to each phase of the three-phase power line 5.
  • the injection waveform generators 31a and 31b of 39u, 39v and 39w output output voltages Vo1 and Vo2 of the same magnitude and opposite phases. Therefore, the difference between the output voltage Vo1 and the output voltage Vo2, that is, injection voltages Vinj1, Vinj2, and Vinj3 which are twice as large as Vo1 and in-phase are applied to the primary windings m5 of the signal conditioning transformers 71u, 71v, and 71w. applied.
  • the fourth noise filter 50 of Embodiment 7 increases the output voltage Vo output by one injection waveform generator 10 or injection waveform generator 31, similarly to the noise filter 50 of Embodiment 3 or 4.
  • the injection voltage Vinj1 whose maximum voltage is twice that of the control power supplies 15a and 15b can be obtained. be done.
  • the fourth noise filter 50 of Embodiment 7 can suppress the differential mode voltages Vdi1, Vdi2, Vdi3 or the differential mode current while being compact and lightweight. can be done.
  • the fifth noise filter 50 of Embodiment 7 includes noise detectors 7p and 7s, injection voltage generators 39p and 39s, and compensation signal applicators 75p and 75s for each wiring of the DC bus of the power converter 2. and are different from the noise filter 50 of the first embodiment. Differences from the noise filter 50 of the first embodiment and the third noise filter 50 of the seventh embodiment are mainly described.
  • the fifth noise filter 50 of the seventh embodiment shown in FIG. 37 similarly to the third noise filter 50 of the seventh embodiment, there This is an example of suppressing differential mode current.
  • the configuration for suppressing the differential mode current in the electromagnetic noise current of the high potential side wiring 44p and the configuration for suppressing the differential mode current in the electromagnetic noise current of the low potential side wiring 44s are the same.
  • the injection voltage generators 39p and 39s can apply the injection voltage generator 39 shown in FIG. A configuration for suppressing the differential mode current in the electromagnetic noise current of the high potential side wiring 44p, which is the DC bus of the power converter 2, will be described as a representative.
  • the noise detector 7p detects the current of the differential mode component in the electromagnetic noise, like the third noise filter 50 of the seventh embodiment.
  • the noise detector 7p includes a detection transformer 80p in which a primary winding m7 is inserted in the high-potential wiring 44p of the power converter 2 .
  • One end of the secondary winding m8 of the detection transformer 80p is connected to the wiring 25, which is the reference wiring having the reference potential Vss, and the other end is connected to the output terminal 95 that outputs the adjustment voltage Vdo1.
  • the detection transformer 80p includes a primary-side primary winding m7 and a secondary-side secondary winding m8. A voltage proportional to the current, that is, a detection voltage Vdsn1 is detected.
  • the detection voltage Vdsn1 is a voltage based on electromagnetic noise. Therefore, the noise detector 7p detects the detection voltage Vdsn1, which is the voltage based on the electromagnetic noise of the high potential side wiring 44p of the power converter 2.
  • FIG. The detection transformer 80p converts the detection voltage Vdsn1 applied across the primary winding m7 to This voltage is output from the output terminal 95 to the injection waveform generators 31a and 31b of the injection voltage generator 39u as the adjusted voltage Vdo1, which is the output of the noise detector 7p.
  • the input terminals 51a and 51b of the injection voltage generator 39p are connected to the output terminal 95 of the detection transformer 80p by the input wiring 33p.
  • the output terminal 52a of the injection voltage generator 39p is connected to one end of the primary winding m1 of the transformer 11p of the compensation signal applicator 75p through the output wiring 34p, and the output terminal 52b of the injection voltage generator 39p is connected through the output wiring 35p. It is connected to the other end of the primary winding m1 of the transformer 11p of the compensation signal applicator 75p.
  • the adjustment voltage Vdo1 is input to the input terminals 51a and 51b of the injection voltage generator 39p, that is, the input terminals 51a and 51b of the injection waveform generators 31a and 31b.
  • the output voltage Vo1 output by the injection waveform generator 31a and the output voltage Vo2 output by the injection waveform generator 31b are voltages of the same magnitude and opposite in phase to each other. is applied to one end and the other end of the primary winding m1 of the transformer 11p, the injection voltage Vinj1, which is the difference, is applied.
  • the transformer 11p generates a compensation voltage Vdm1 across the secondary winding m2 according to the turns ratio Rr, and applies the compensation voltage Vdm1 to the high-potential wiring 44p.
  • the fifth noise filter 50 of Embodiment 7 is configured such that the compensation voltage Vdm1, which is the voltage superimposed on the high potential side wiring 44p via the secondary winding m2 of the transformer 11p, reduces the detected voltage Vdsn1. That is, the gain Gi and the turns ratio Rr are set so that the equation (11) holds.
  • the configuration for suppressing the differential mode current in the electromagnetic noise current of the low potential side wiring 44s, which is the DC bus of the power converter 2 is the differential mode current in the electromagnetic noise current of the high potential side wiring 44p, which is the DC bus of the power converter 2.
  • This is the same as the configuration for suppressing the mode current. Therefore, the symbols 7p, 80p, 39p, 33p, 34p, 35p, 75p, and 11p of each component are read as 7s, 80s, 39s, 33s, 34s, 35s, 75s, and 11s, respectively.
  • the symbols Vdsn1, Vdo1, Vinj1, and Vdm1 of the voltages are replaced with Vdsn2, Vdo2, Vinj2, and Vdm2, respectively.
  • the third noise filter 50 of the seventh embodiment without increasing the output voltage Vo output by one injection waveform generator 31, that is, the output voltages Vo1, Injection voltages Vinj1 and Vinj2 whose maximum voltage is twice that of the control power sources 15a and 15b can be obtained without increasing Vo2.
  • the size of the transformers 11p and 11s or the control power supplies 15a and 15b can be reduced, and the noise filter 50 can be made smaller and lighter. Therefore, the fifth noise filter 50 of Embodiment 7 can suppress the differential current in the electromagnetic noise current while being compact and lightweight, that is, it can enhance the noise reduction effect while being compact and lightweight.
  • the sixth noise filter 50 of Embodiment 7 includes one noise detector 7 having primary windings m7a and m7b connected to two wires of the single-phase power line 45, that is, the single-phase power lines 45a and 45b, respectively;
  • Embodiment 7 is different from Embodiment 7 in that it includes one injection voltage generator 39 and one compensation signal applicator 75 having secondary windings m2a and m2b connected to single-phase power lines 45a and 45b, respectively. It differs from the third noise filter 50 .
  • the single-phase power line 45 is an example of a single-phase power line on the output side of the power converter 2 . Differences from the third noise filter 50 of Embodiment 7 will be mainly described.
  • the noise detector 7 does not detect common mode components in two lines of the single-phase power line 45, ie, the single-phase power line 45a and the single-phase power line 45b. configured to be detected.
  • FIG. 38 shows a detection transformer 80 as an example of the noise detector 7 .
  • the primary winding m7a connected to the single-phase power line 45a and the primary winding m7b connected to the single-phase power line 45b are wound in opposite directions.
  • One end of the secondary winding m8 of the detection transformer 80 is connected to the wiring 25, which is the reference wiring having the reference potential Vss, and the other end is connected to the output terminal 95 for outputting the adjustment voltage Vdo.
  • the detection voltages Vdsn1 and Vdsn2 are voltages based on electromagnetic noise.
  • the secondary winding m8 of the detection transformer 80 generates a voltage obtained by adding the detection voltage Vdsn1 detected by the primary winding m7a and the detection voltage Vdsn2 detected by the primary winding m7b.
  • the noise detector 7 outputs an adjusted voltage Vdo based on the reference potential Vss from the output terminal 95 .
  • the adjusted voltage Vdo output by the noise detector 7 is the sum of the detected voltage Vdsn1 detected by the primary winding m7a and the detected voltage Vdsn2 detected by the primary winding m7b.
  • the compensation signal applicator 75 applies only the voltage based on the current of the differential mode component without applying the voltage based on the current of the common mode component in the two lines of the single-phase power line 45, that is, the single-phase power line 45a and the single-phase power line 45b. It is configured so that it can be applied.
  • FIG. 38 shows the transformer 11 as an example of the compensation signal applicator 75 .
  • the secondary winding m2a connected to the single-phase power line 45a and the secondary winding m2b connected to the single-phase power line 45b are wound in opposite directions.
  • An injection voltage Vinj is applied to the primary winding m1 of the transformer 11 .
  • compensation voltages Vdm1 and Vdm2 that are the same as the injection voltage Vinj are superimposed on the single-phase power lines 45a and 45b, respectively.
  • the voltage based on the current of the differential mode component superimposed on the two lines of single-phase power line 45, ie, single-phase power line 45a and single-phase power line 45b, is the sum of compensation voltage Vdm1 and compensation voltage Vdm2.
  • the sixth noise filter 50 of Embodiment 7 is compact and lightweight, yet has a differential current in the current of the electromagnetic noise generated in the two lines of the single-phase power line 45. can be suppressed, that is, the noise reduction effect can be enhanced while being compact and lightweight.
  • a seventh noise filter 50 according to the seventh embodiment includes one noise detector 7 having primary windings m7a and m7b connected to a high-potential wiring 44p and a low-potential wiring 44s, respectively.
  • This embodiment is characterized in that it includes one compensation signal applicator 75 having secondary windings m2a, m2b connected to the voltage generator 39, the high potential side wiring 44p, and the low potential side wiring 44s, respectively. 7 differs from the fifth noise filter 50 in FIG. Differences from the fifth noise filter 50 of Embodiment 7 will be mainly described.
  • the noise detector 7 is configured to detect only the differential mode component, ie, only the current of the differential mode component in the electromagnetic noise, without detecting the common mode component in the high potential side wiring 44p and the low potential side wiring 44s.
  • FIG. 39 shows a detection transformer 80 as an example of the noise detector 7 .
  • the primary side winding m7a connected to the high potential side wiring 44p and the primary side winding m7b connected to the low potential side wiring 44s are wound in opposite directions.
  • One end of the secondary winding m8 of the detection transformer 80 is connected to the wiring 25, which is the reference wiring having the reference potential Vss, and the other end is connected to the output terminal 95 for outputting the adjustment voltage Vdo.
  • the detection voltages Vdsn1 and Vdsn2 are voltages based on electromagnetic noise.
  • the secondary winding m8 of the detection transformer 80 generates a voltage obtained by adding the detection voltage Vdsn1 detected by the primary winding m7a and the detection voltage Vdsn2 detected by the primary winding m7b.
  • the noise detector 7 outputs an adjusted voltage Vdo based on the reference potential Vss from the output terminal 95 .
  • the adjusted voltage Vdo output by the noise detector 7 is the sum of the detected voltage Vdsn1 detected by the primary winding m7a and the detected voltage Vdsn2 detected by the primary winding m7b.
  • the compensating signal applicator 75 is configured to apply only the voltage based on the current of the differential mode component without applying the voltage based on the current of the common mode component to the high potential side wiring 44p and the low potential side wiring 44s.
  • FIG. 39 shows the transformer 11 as an example of the compensation signal applicator 75 .
  • the secondary winding m2a connected to the high potential wiring 44p and the secondary winding m2b connected to the low potential wiring 44s are wound in opposite directions.
  • An injection voltage Vinj is applied to the primary winding m1 of the transformer 11 .
  • compensation voltages Vdm1 and Vdm2 which are the same as the injected voltage Vinj, are superimposed on the high potential side wiring 44p and the low potential side wiring 44s, respectively, according to the injected voltage Vinj. be.
  • the voltage based on the current of the differential mode component superimposed on the two lines of the DC bus lines of the power converter 2, ie, the high potential side wiring 44p and the low potential side wiring 44s, is the sum of the compensation voltage Vdm1 and the compensation voltage Vdm2. It has become.
  • the seventh noise filter 50 of Embodiment 7 like the fifth noise filter 50 of Embodiment 7, is compact and lightweight, yet reduces the current of electromagnetic noise generated in the two lines of the DC bus of the power converter 2. In other words, the noise reduction effect can be enhanced while the size and weight are reduced.
  • the noise filter 50 of Embodiment 7 performs noise detection for each phase of the three-phase power line 5, each phase of the three-phase power line 4, each power line of the single-phase power line 45, and each wiring of the DC bus of the power converter 2.
  • the output voltage Vo1 and the output voltage Vo2 have the same magnitude.
  • the output voltage Vo1 and the output voltage Vo2 may have different magnitudes.
  • the primary windings m1 of the transformers 11u, 11v, and 11w in the compensation signal applicators 75, 75u, 75v, and 75w or the primary windings m5 of the signal conditioning transformers 71u, 71v, and 71w output Injection voltages Vinj1, Vinj2, Vinj3, and Vinj which are the difference between the voltage Vo1 and the output voltage Vo2, that is, the voltages larger than the output voltage Vo1 and having the same phase, are applied.
  • the size of the transformers 11, 11u, 11v and 11w, the signal conditioning transformers 71u, 71v and 71w or the control power sources 15a and 15b can be reduced.
  • the noise filter 50 can be made smaller and lighter.
  • the transformers 11, 11p in the compensation signal applicators 75, 75p, 75s , and 11s, the difference between the output voltage Vo1 and the output voltage Vo2, that is, the injection voltages Vinj1, Vinj2, and Vinj, which are larger than the output voltage Vo1 and have the same phase, are applied to the primary windings m1.
  • the size of the transformers 11, 11p, 11s or the control power supplies 15a, 15b can be reduced, and the noise filter 50 can be made smaller and lighter.
  • the noise filter 50 of the seventh embodiment shown in FIGS. 31, 33, 35 to 36, and 38 has a feed-forward configuration, but the compensation signal applicators 75, 75u, 75v, and 75w and the noise detector
  • the positions of 7, 7u, 7v, 7w can also be exchanged to form a feedback configuration.
  • the noise filter 50 of the seventh embodiment shown in FIGS. 37 and 39 has a feedforward configuration, but the positions of the compensation signal applicators 75, 75p, 75s and the noise detectors 7, 7p, 7s are exchanged. , can also be a feedback configuration.
  • the noise detectors 7u, 7v, 7w and the compensation signal applicators 75u, 75v, 75w may be connected to the three-phase power line 4 on the input side of the power converter 2 .
  • the noise detector 7 and compensation signal applicator 75 shown in FIG. You may
  • the noise filter 50 of Embodiments 1 to 7 includes a power converter 2 that converts three-phase AC power or single-phase AC power to three-phase AC power or single-phase AC power via DC power.
  • a power converter 2 that converts three-phase AC power or single-phase AC power to three-phase AC power or single-phase AC power via DC power.
  • power converter 2 may be an isolated DC-DC converter. In this case, the AC power supply 1 becomes a DC power supply, and the induction motor 3 becomes a DC motor.
  • Noise filter 70 70u, 70v, 70w Voltage dividing transformer 71, 71u, 71v, 71w Signal adjustment transformer 72 Signal applicator 73, 73u, 73v, 73w ... Capacitors 75, 75u, 75v, 75w, 75p, 75s ... Compensation signal applicator 80, 80u, 80v, 80w, 80p, 80s ... Detection transformer 95, 95a, 95b ... Output terminals m1 ... Primary winding , m2, m2a, m2b... secondary winding, m3... primary winding, m4, m4a, m4b... secondary winding, m5...

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PCT/JP2022/008506 2022-03-01 2022-03-01 ノイズフィルタ Ceased WO2023166544A1 (ja)

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CN202280092632.8A CN118975110A (zh) 2022-03-01 2022-03-01 噪声滤波器
US18/840,956 US20250175160A1 (en) 2022-03-01 2022-03-01 Noise filter
EP22929693.4A EP4489276A4 (en) 2022-03-01 2022-03-01 NOISE FILTER
PCT/JP2022/008506 WO2023166544A1 (ja) 2022-03-01 2022-03-01 ノイズフィルタ

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JPWO2023166544A1 (https=) 2023-09-07
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US20250175160A1 (en) 2025-05-29
JP7714112B2 (ja) 2025-07-28

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