WO2022210950A1 - 電力変換装置、空気調和機及び冷凍装置 - Google Patents
電力変換装置、空気調和機及び冷凍装置 Download PDFInfo
- Publication number
- WO2022210950A1 WO2022210950A1 PCT/JP2022/016216 JP2022016216W WO2022210950A1 WO 2022210950 A1 WO2022210950 A1 WO 2022210950A1 JP 2022016216 W JP2022016216 W JP 2022016216W WO 2022210950 A1 WO2022210950 A1 WO 2022210950A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- filter
- reactor
- power
- capacitor
- wiring pair
- Prior art date
Links
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 27
- 238000005057 refrigeration Methods 0.000 title claims description 6
- 239000003990 capacitor Substances 0.000 claims abstract description 58
- 239000000758 substrate Substances 0.000 claims description 10
- 239000004065 semiconductor Substances 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 19
- 230000003321 amplification Effects 0.000 description 16
- 238000003199 nucleic acid amplification method Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 13
- 238000004088 simulation Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 238000004458 analytical method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 4
- 229910002601 GaN Inorganic materials 0.000 description 2
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 229910005191 Ga 2 O 3 Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 description 1
- 229910001195 gallium oxide Inorganic materials 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output 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
- 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
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
-
- 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
-
- 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
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/4815—Resonant converters
Definitions
- the present disclosure relates to power converters, air conditioners, and refrigerators.
- Patent Document 1 a power conversion device in which the resonance frequency of the LC filter is set to a frequency band greater than 40 times the power supply frequency for which no power supply harmonic standard exists (for example, Patent Document 1).
- the resonance frequency of the LC filter is set to be greater than 40 times the power supply frequency, if harmonic components near the resonance frequency appear in the reactor or capacitor, the signal may be excessively amplified according to the frequency characteristics of the LC filter.
- the present disclosure provides a power conversion device capable of suppressing amplification of harmonic components by an LC filter, and an air conditioner provided with the power conversion device.
- a power converter a converter that converts alternating current input from an alternating current power supply via a first wiring pair into direct current; an inverter that converts the DC power output from the converter to the second wiring pair into AC power; a capacitor connected between the first wiring pair or between the second wiring pair;
- the inductance of the inductance component from the point where the power conversion device is connected to the AC power supply to the capacitor is L, and the maximum value of the output frequency of the inverter is MAX(f 0 )
- the static electricity of the capacitor C which is the capacity
- a gain at the carrier frequency fc of the LC filter formed by the inductance component and the capacitor may be 0.1 or less.
- the gain of the LC filter at the carrier frequency fc becomes ⁇ 20 dB (0.1 times) or less, so that the LC filter can suppress harmonic components in the carrier frequency band.
- a gain at 6 ⁇ MAX(f 0 ) of the LC filter by the inductance component and the capacitor may be 5 or less.
- the inductance component includes a reactor inserted in series into one or both of the first wiring pair or one or both of the second wiring pair;
- the capacitor may be connected between the first wiring pair or the second wiring pair between the reactor and the inverter.
- This disclosure is a converter that converts alternating current input from an alternating current power supply via a first wiring pair into direct current; an inverter that converts the DC power output from the converter to the second wiring pair into AC power; a reactor inserted in series into one or both wirings of the first wiring pair or one or both wirings of the second wiring pair; A capacitor connected between the first wiring pair or between the second wiring pair between the reactor and the inverter,
- the carrier frequency for driving the inverter is f c
- the resonance frequency of the LC filter formed by the reactor and the capacitor is f LC
- the maximum value of the output frequency of the inverter is MAX(f 0 )
- MAX (f 0 ) is
- the gain of the LC filter at the carrier frequency f c may be less than or equal to 0.1.
- the gain of the LC filter at the carrier frequency fc becomes ⁇ 20 dB (0.1 times) or less, so that the LC filter can suppress harmonic components in the carrier frequency band.
- the gain of the LC filter at 6x the MAX(f 0 ) may be 5 or less.
- the reactor may be a component mounted on a substrate.
- the carrier frequency f c is set to a relatively large value. Since the inductance of the reactor can be decreased as the carrier frequency fc increases, the size of the reactor can be reduced. By downsizing the reactor, it becomes easier to mount the reactor on a substrate. Therefore, even if the reactor tends to generate heat by reducing the inductance, the temperature rise of the reactor can be suppressed by radiating heat to the substrate.
- the capacitor may be connected between the second wiring pair.
- the LC filter including the capacitor connected between the second wiring pair.
- the capacitor connected between the second wiring pair can absorb a surge voltage caused by switching of the inverter.
- the MAX(f 0 ) may be 600 Hz.
- 600 Hz is the upper limit of the output frequency of the list regulation, so the list regulation can be satisfied.
- the switching element configured in the inverter may be a wide bandgap semiconductor device.
- the loss reduction effect of the switching element is enhanced.
- the present disclosure provides an air conditioner that includes the power conversion device described above.
- the present disclosure provides a refrigeration system including the above power converter.
- FIG. 4 is a diagram showing an example of a setting range of resonance frequencies of an LC filter
- FIG. 2 is a cross-sectional view partially showing a configuration example of an electrical unit including a power conversion device
- FIG. 4 is a diagram showing simulated waveforms of respective parts according to an embodiment
- FIG. 10 is a diagram showing simulation waveforms of respective parts according to a comparative example
- FIG. 4 is a diagram showing frequency analysis results of simulation waveforms of respective parts according to an embodiment; It is a figure which shows the frequency-analysis result of the simulation waveform of each part by one comparative example.
- FIG. 4 is a diagram showing simulated waveforms of respective parts according to an embodiment;
- FIG. 10 is a diagram showing simulation waveforms of respective parts according to a comparative example;
- FIG. 4 is a diagram showing frequency analysis results of simulation waveforms of respective parts according to an embodiment; It is a figure which shows the frequency-analysis result of the simulation waveform of each part by one comparative example.
- FIG. 10 is a diagram showing conditions during simulation of FIGS. 6 to 9;
- FIG. FIG. 14 is a diagram showing conditions during the simulation of FIGS. 10 to 13;
- FIG. 1 is a diagram showing a first configuration example of a power converter to which the technology of the present disclosure is applied.
- a power converter 1A shown in FIG. is converted into output AC power and supplied to the motor 7.
- a power conversion device 1A is provided, for example, in an air conditioner 101 that conditions the air in a target space.
- the equipment on which the power conversion device 1A is mounted is not limited to an air conditioner, and may be other equipment that requires a power conversion function.
- the air conditioner 101 is an example of a refrigeration system (refrigeration cycle system) including a compressor driven by the motor 7 .
- Motor 7 is, for example, a three-phase AC motor.
- a specific example of the motor 7 is an electric motor that drives a compressor provided in the refrigerant circuit of the air conditioner 101 .
- the motor 7 is, for example, a concentrated winding motor such as a 4-pole 6-slot or 6-pole 9-slot motor.
- the harmonic components of the induced voltage tend to include many 5th and 7th order components of the fundamental wave.
- High-order (for example, sixth-order) harmonic components caused by this motor voltage distortion (fifth and seventh-order harmonic components of the fundamental wave) appear in the input power of the motor 7 and the input side of the inverter circuit 4.
- the high-order harmonic components are the power supply current i in of the AC power supply 6, the DC link voltage v dc in the DC link section 3, the reactor voltage v L across the reactor 8, the reactor current i L flowing through the reactor 8, or the DC It may appear in the direct current i dc flowing through the link portion 3 .
- the converter circuit 2 is an example of a converter that converts three-phase alternating current input from the alternating current power supply 6 via a plurality of wirings 61, 62, and 63 into direct current.
- the three-phase alternating current supplied from the alternating current power supply 6 includes three wirings 61, 62, 63 (three sets including wiring pairs 61, 62, wiring pairs 62, 63, and wiring pairs 61, 63). are input to the input portion of the converter circuit 2 via a pair of wirings).
- At least one of the three pairs of wires including the pair of wires 61 and 62, the pair of wires 62 and 63, and the pair of wires 61 and 63 is the first pair of wires between the AC power supply 6 and the converter circuit 2. is an example.
- the converter circuit 2 is connected to the AC power supply 6 and converts the AC output by the AC power supply 6 into DC.
- the converter circuit 2 is, for example, a diode bridge circuit in which a plurality of (six in this example) diodes are connected in a bridge shape. These diodes full-wave rectify the AC voltage of the AC power supply 6 and convert it into a DC voltage.
- the converter circuit 2 may be a voltage conversion circuit of a circuit type other than a diode bridge as long as it is a circuit that supplies converted DC power to the inverter circuit 4 via the DC link section 3 .
- the DC link section 3 includes a capacitor 3 a connected between the converter circuit 2 and the inverter circuit 4 .
- the capacitor 3 a is connected in parallel to the output of the converter circuit 2 , and the DC voltage (DC link voltage v dc ) generated across the capacitor 3 a is input to the input node of the inverter circuit 4 .
- Capacitor 3 a is connected between wiring pair 31 and 32 . Of the wiring pair 31 and 32, one wiring 31 is a positive bus and the other wiring 32 is a negative bus.
- the wiring pair 31, 32 is an example of a second wiring pair.
- the DC link section 3 includes a reactor 8 connected between the converter circuit 2 and the inverter circuit 4 .
- Reactor 8 is inserted in series in a DC bus between the output of converter circuit 2 and the input of inverter circuit 4 .
- the reactor 8 is inserted in series in one wiring 31 of a wiring pair 31 and 32, which are a pair of DC buses.
- the reactor 8 may be inserted in series with the wiring 32 or may be inserted in series with both of the pair of wirings 31 and 32 .
- the reactor 8 may be inserted in series with all of the wirings 61 , 62 , 63 .
- wiring means a path through which current passes, and is not limited to a simple conducting wire.
- the wiring 32 may be a grounded conductive portion or a heat sink for heat dissipation of the inverter circuit 4 .
- the inverter circuit 4 is an example of an inverter that converts the DC power output from the converter circuit 2 to the wiring pair 31 and 32 into AC power.
- the inverter circuit 4 has an input node connected in parallel to the capacitor 3a of the DC link section 3, switches the output of the DC link section 3, converts it into a three-phase AC, and supplies the connected motor 7 with the three-phase AC.
- the inverter circuit 4 of this embodiment is configured by connecting a plurality of switching elements 4a in a bridge connection. Since the inverter circuit 4 outputs a three-phase alternating current to the motor 7, it has six switching elements.
- the inverter circuit 4 includes three switching legs connected in parallel with each other, and each switching leg has two switching elements connected in series with each other. In each switching leg, the midpoint between the upper arm switching element and the lower arm switching element is connected to each phase coil of the motor 7 .
- a free wheel diode is connected in anti-parallel to each switching element.
- the inverter circuit 4 switches the DC link voltage vdc input from the DC link unit 3 by turning on and off these switching elements, converts it into a three-phase AC voltage, and supplies it to the motor 7 .
- the control part 5 performs control of this ON/OFF operation.
- the switching element 4a is preferably a device containing a wide bandgap semiconductor such as SiC (silicon carbide), GaN (gallium nitride), Ga 2 O 3 (gallium oxide), diamond, or the like.
- a wide bandgap semiconductor such as SiC (silicon carbide), GaN (gallium nitride), Ga 2 O 3 (gallium oxide), diamond, or the like.
- the switching element may be an element containing a semiconductor such as Si (silicon).
- the diode may be an element containing a semiconductor such as Si (silicon).
- the switching elements may be unipolar transistors comprising wide bandgap semiconductors.
- the body diode of the unipolar transistor as a freewheeling diode, it is not necessary to provide a diode connected in anti-parallel.
- the control unit 5 controls switching (on/off operation) in the inverter circuit 4 .
- the control unit 5 is, for example, a control circuit including a processor such as a CPU (Central Processing Unit) and a memory.
- the functions of the control unit 5 may be implemented by the processor operating according to a program readable and stored in the memory.
- the functions of the control unit 5 may be realized by FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit).
- FIG. 2 is a diagram showing a second configuration example of the power converter to which the technology of the present disclosure is applied. A description of the configuration similar to that of the first configuration example is omitted by citing the above description.
- the power converter 1B shown in FIG. 2 includes a converter circuit 2, a DC link section 3, an inverter circuit 4, and a control section 5, and converts input AC power supplied from a single-phase AC power supply 6 into a predetermined voltage and a predetermined frequency. is converted into output AC power and supplied to the motor 7.
- the converter circuit 2 is an example of a converter that converts single-phase alternating current input from the alternating current power supply 6 via a plurality of wirings 64 and 65 into direct current.
- the single-phase alternating current supplied from the alternating current power supply 6 is input to the input section of the converter circuit 2 via two wirings 64, 65 (one wiring pair 64, 65).
- the converter circuit 2 is connected to the AC power supply 6 via the reactor 8, and rectifies (converts) the AC output by the AC power supply 6 to DC.
- the converter circuit 2 is, for example, a diode bridge circuit in which a plurality of (four in this example) diodes are connected in a bridge shape. These diodes full-wave rectify the AC voltage of the AC power supply 6 and convert it into a DC voltage.
- the converter circuit 2 may be a voltage conversion circuit of a circuit type other than a diode bridge as long as it is a circuit that supplies converted DC power to the inverter circuit 4 via the DC link section 3 .
- Reactor 8 is connected between AC power supply 6 and converter circuit 2, and more specifically, inserted in series between the AC output side of AC power supply 6 and the AC input side of converter circuit 2.
- the reactor 8 is inserted in series with one wiring 64 of the wiring pair 64 and 65 .
- the reactor 8 may be inserted in series with the wiring 65 or may be inserted in series with both of the wiring pair 64 and 65 .
- the reactor 8 may be inserted in series in one or both of the wiring pairs 31 and 32 .
- the capacitance value of the capacitor 3a can hardly smooth the output of the converter circuit 2, while the ripple voltage caused by the switching operation of the inverter circuit 4 (the voltage corresponding to the switching frequency fc It is set so that fluctuations) can be suppressed.
- the capacitor 3a has a capacitance value (for example, It is composed of a small-capacity capacitor (for example, a film capacitor) having a capacity of several tens to several hundred ⁇ F.
- DC link voltage v dc Since the capacitance value of the capacitor 3a is thus small, the output of the converter circuit 2 is hardly smoothed in the DC link section 3.
- the DC link voltage vdc has a pulsation component with a frequency six times the frequency of the power supply voltage vin, and in the case of the single-phase AC power supply 6 in FIG. , has a pulsating component with a frequency twice the frequency of the power supply voltage v in .
- the reactor 8 and the capacitor 3a constitute an LC filter.
- an LC filter is configured by a reactor 8 arranged in series with a wiring 31 and a capacitor 3a connected between a pair of wirings 31 and 32 between the reactor 8 and the inverter circuit 4. It is An LC filter may be configured by a reactor 8 arranged in series with a wiring 32 and a capacitor 3 a connected between a pair of wirings 31 and 32 between the reactor 8 and the inverter circuit 4 . An LC filter is configured by a reactor 8 arranged in series with each of the wiring pairs 31 and 32 and a capacitor 3a connected between the wiring pairs 31 and 32 between the reactors 8 and the inverter circuit 4.
- the capacitors that make up the LC filter may include three phase-to-phase capacitors, including a capacitor between wire pairs 61 and 62 , a capacitor between wire pairs 62 and 63 , and a capacitor between wire pairs 61 and 63 .
- a reactor that configures the LC filter may include a plurality of reactors arranged in series with each of the wirings 61 , 62 , 63 .
- the inductance used for calculating the resonance frequency of the LC filter when the reactor is arranged in series with each of the wirings 61, 62, 63 is the inductance of each reactor arranged in series with each of the wirings 61, 62, 63. is 2 ⁇ L.
- the LC filter is configured by the reactor 8 arranged in series with the wiring 64 and the capacitor 3a connected between the wiring pair 31 and 32 between the reactor 8 and the inverter circuit 4.
- An LC filter may be configured by the reactor 8 arranged in series with the wiring 65 and the capacitor 3 a connected between the pair of wirings 31 and 32 between the reactor 8 and the inverter circuit 4 .
- An LC filter is configured by a reactor 8 arranged in series with each of the wiring pairs 64 and 65 and a capacitor 3a connected between the wiring pairs 31 and 32 between the reactors 8 and the inverter circuit 4.
- the capacitors forming the LC filter may include a capacitor connected between a pair of wirings 64 and 65 between reactor 8 and converter circuit 2 .
- a reactor that configures the LC filter may include a reactor that is arranged in series with at least one of the wiring pair 31 and 32 .
- FIG. 3 is a diagram showing an example of transfer characteristics of an LC filter.
- An LC filter has a resonant frequency. If harmonic components near the resonance frequency of the LC filter appear in the reactor 8 or the capacitor 3a, the signal may be excessively amplified according to the frequency characteristics of the LC filter. Excessive amplification of the signal may cause, for example, abnormal heat generation in the reactor 8 or excessive DC link voltage vdc .
- harmonic components appearing in the DC link section 3 mainly a: n-fold component of the power supply frequency (n is an integer of 1 or more) b: 6-fold component of the output frequency c: carrier frequency ⁇ (3-fold component of the output frequency) etc.
- the harmonic component a is determined by the power supply frequency of the AC power supply 6 and appears in the frequency band of 2 kHz or less.
- the harmonic component b is determined by the output frequency of the inverter circuit 4 and also appears in a frequency band higher than the harmonic component a.
- the harmonic component c is determined by the carrier frequency and the output frequency of the inverter circuit 4, and appears in a frequency band higher than the harmonic components a and b.
- harmonic components a, b, and c appear near the resonance frequency of the LC filter, the signal is amplified according to the frequency characteristics of the LC filter.
- the harmonic component b is determined by the output frequency of the inverter circuit 4
- the harmonic component c is determined by the carrier frequency and the output frequency of the inverter circuit 4.
- FIG. Therefore, when the carrier frequency is increased to make the LC filter smaller and the resonance frequency of the LC filter is increased, there appears a region where the harmonic components a, b, and c and the resonance of the LC filter are less likely to interfere ( See Figure 4).
- FIG. 4 is a diagram showing an example of the setting range of the resonance frequency of the LC filter.
- the carrier frequency for driving the inverter circuit 4 is f c
- the resonance frequency of the LC filter by the reactor 8 and the capacitor 3a is f LC
- the maximum value of the output frequency of the inverter circuit 4 is MAX(f 0 ). do.
- MAX(f 0 ) is
- the characteristics of the LC filter can be set to frequency bands in which it is difficult to amplify the harmonic components a, b, and c.
- Equation 1 is solved for MAX(f 0 ).
- L be the inductance of the inductance component from the point where the power converter 1A or the like is connected to the AC power supply 6 to the capacitor 3a
- C be the capacitance of the capacitor 3a
- the place where the power conversion device is connected to the AC power supply 6 is, for example, the AC input terminal of the power conversion device 1A to which a plurality of wirings 61, 62, and 63 are connected in the case of FIG. 1, and in the case of FIG. It is an AC input terminal of the power converter 1B to which a plurality of wirings 64 and 65 are connected.
- the lower limit of C in Equation 9 is infinitely close to zero when the power supply impedance on the AC power supply 6 side is infinite when viewed from the power converter. Since the power supply impedance differs from country to country, the lower limit of C in Equation 9 can take any value.
- the characteristics of the LC filter can be set to frequency bands in which it is difficult to amplify the harmonic components a, b, and c.
- the resonance frequency f LC is higher than 6 ⁇ MAX(f 0 ), for example, amplification of harmonic components by the LC filter can be suppressed without adding an additional circuit or special control. Since the resonance frequency f LC is lower than f c ⁇ 3 ⁇ MAX(f 0 ), it is possible to suppress an increase in the size of the circuit due to the addition of a noise filter or the like due to an increase in the carrier frequency.
- MAX(f 0 ) is set to 600 Hz.
- 600 Hz is the upper limit of the output frequency of the list regulation, so the list regulation can be satisfied.
- the gain of the LC filter at carrier frequency fc is set to 0.1 or less.
- the gain of the LC filter at the carrier frequency fc becomes ⁇ 20 dB (0.1 times) or less, so that the LC filter can suppress harmonic components in the carrier frequency band.
- the gain of the LC filter at the carrier frequency fc is preferably 0.01 or less (-40 dB or less), and 0.001 or less (-60 dB or less). is more preferred.
- the gain of the LC filter at 6 ⁇ MAX(f 0 ) is set to 5 or less. This makes the gain of the LC filter at 6 ⁇ MAX(f 0 ) less than 14 dB (five times). As a result, the effect of suppressing the amplification of the harmonic components in the low-frequency region side by the LC filter with respect to the resonance frequency f LC of the LC filter is enhanced.
- FIG. 5 shows a vertical cross-sectional view of an electrical unit including a power conversion device.
- the electrical unit 10 shown in FIG. 5 includes a box-shaped housing 15 and a power converter 20 housed in the housing 15 .
- the power conversion device 20 is an example of the above power conversion device 1A and the like.
- the power converter 20 includes components such as the converter circuit 2, the reactor 8, the capacitor 3a, the inverter circuit 4, and the controller 5, as described above. These components in power converter 20 are mounted on board 60 . Thereby, the heat of these parts such as the reactor 8 can be radiated to the substrate 60 .
- the substrate 60 is fixed to the inner surface of the housing 15 .
- the substrate 60 is thermally connected to the radiator 47 via the thermally conductive connecting member 80 , so that the heat of the substrate 60 can be radiated from the radiator 47 .
- a through hole 15d is formed in the housing 15.
- the substrate 60 is thermally connected to a radiator 47 provided outside the housing 15 via a connecting member 80 passing through the through hole 15d.
- FIG. 1 shows the case where the resonance frequency of the LC filter is set to satisfy the above formula 1
- the technique of Patent Document 1 shows the case where the resonance frequency of the LC filter is set to be greater than 40 times the power supply frequency.
- 6 to 9 show the case where a harmonic component b (a component six times the output frequency) appears.
- 6 and 7 show waveforms of the power supply current i in of the AC power supply 6, the reactor current i L flowing through the reactor 8, the DC link voltage v dc in the DC link section 3, and the motor current im flowing through the motor 7.
- FIG. FIG. 6 shows an embodiment to which the technique of the present disclosure is applied
- FIG. 7 shows a comparative form to which the technique of Patent Literature 1 is applied.
- 8 and 9 show the waveforms of the power supply current i in of the AC power supply 6, the reactor current i L flowing through the reactor 8, the DC link voltage v dc at the DC link section 3, and the motor current im flowing through the motor 7 by fast Fourier analysis. The result of frequency analysis by conversion is shown.
- FIG. 8 shows an embodiment to which the technique of the present disclosure is applied
- FIG. 9 shows a comparative form to which the technique of Patent Literature 1 is applied.
- the harmonic component b (six times the output frequency) and the resonance frequency of the LC filter are close to each other, the harmonic component b (six times the output frequency) causes The resonance of the LC filter is excited, and harmonic components near the resonance frequency appear significantly.
- the harmonic component b (6-fold component of the output frequency) is set sufficiently smaller than the resonance frequency of the LC filter. Amplification of b (six times the output frequency) is suppressed. As a result, as shown in FIGS.
- FIGS. 10 to 13 show the case where a harmonic component c (carrier frequency ⁇ (triple component of the output frequency)) appears.
- 10 and 11 show waveforms of the power supply current i in of the AC power supply 6, the reactor current i L flowing through the reactor 8, the DC link voltage v dc at the DC link section 3, and the motor current im flowing through the motor 7.
- FIG. FIG. 10 shows an embodiment to which the technique of the present disclosure is applied
- FIG. 11 shows a comparative form to which the technique of Patent Literature 1 is applied.
- FIG. 12 and 13 show the waveforms of the power supply current i in of the AC power supply 6, the reactor current i L flowing through the reactor 8, the DC link voltage v dc at the DC link section 3, and the motor current im flowing through the motor 7 using a fast Fourier technique. The result of frequency analysis by conversion is shown.
- FIG. 12 shows an embodiment to which the technique of the present disclosure is applied
- FIG. 13 shows a comparative form to which the technique of Patent Literature 1 is applied.
- the harmonic component c (carrier frequency-(three-fold component of the output frequency)) appears in the vicinity of the resonance frequency of the LC filter.
- the harmonic component c (carrier frequency-(triple component of the output frequency)) appears apart from the resonance frequency of the LC filter.
- the technique of the present disclosure suppresses the peak of the harmonic component c (carrier frequency - (three times the output frequency)) on the low frequency side compared to the technique of Patent Document 1. It is As a result, as shown in FIGS.
- an LC filter is arranged in the DC link section 3 .
- the same LC filter function can be realized, even if the LC filter is arranged between the AC power supply 6 and the converter circuit 2, only the reactor constituting the LC filter is connected between the AC power supply 6 and the converter circuit 2.
- the DC link section 3 is provided with a capacitor 3a that constitutes an LC filter.
- the LC filter can be configured between the AC power supply 6 and the converter circuit 2 even if the capacitor that constitutes the LC filter is connected between the AC power supply 6 and the converter circuit 2. I don't mind. That is, the LC filter may be placed anywhere as long as the capacitor is connected between the reactor and the inverter circuit (inverter) that constitute the LC filter.
- the LC filter may be configured without a reactor.
- an LC filter may be configured by an inductance component of wiring and a capacitor.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
Description
電力変換装置であって、
交流電源から第1配線対を介して入力される交流を直流に変換する変換器と、
前記変換器から第2配線対に出力される直流電力を交流電力に変換する逆変換器と、
前記第1配線対の間又は前記第2配線対の間に接続されたコンデンサと、を備え、
前記電力変換装置が前記交流電源と接続される箇所から前記コンデンサまでのインダクタンス成分のインダクタンスをL、前記逆変換器の出力周波数の最大値をMAX(f0)とするとき、前記コンデンサの静電容量であるCは、
前記逆変換器の駆動のキャリア周波数をfcとするとき、
前記インダクタンス成分と前記コンデンサとによるLCフィルタの前記キャリア周波数fcでのゲインは、0.1以下でもよい。
前記インダクタンス成分と前記コンデンサとによるLCフィルタの6×前記MAX(f0)でのゲインは、5以下でもよい。
前記インダクタンス成分は、前記第1配線対のうちの一方もしくは両方の配線に又は前記第2配線対のうちの一方もしくは両方の配線に直列に挿入されたリアクトルを含み、
前記コンデンサは、前記リアクトルと前記逆変換器との間において、前記第1配線対の間又は前記第2配線対の間に接続されてもよい。
交流電源から第1配線対を介して入力される交流を直流に変換する変換器と、
前記変換器から第2配線対に出力される直流電力を交流電力に変換する逆変換器と、
前記第1配線対のうちの一方もしくは両方の配線又は前記第2配線対のうちの一方もしくは両方の配線に直列に挿入されたリアクトルと、
前記リアクトルと前記逆変換器との間において、前記第1配線対の間又は前記第2配線対の間に接続されたコンデンサと、を備え、
前記逆変換器の駆動のキャリア周波数をfc、前記リアクトルと前記コンデンサとによるLCフィルタの共振周波数をfLC、前記逆変換器の出力周波数の最大値をMAX(f0)とするとき、MAX(f0)は、
前記キャリア周波数fcでの前記LCフィルタのゲインは、0.1以下でもよい。
6×前記MAX(f0)での前記LCフィルタのゲインは、5以下でもよい。
前記リアクトルは、基板に実装された部品でもよい。
前記コンデンサは、前記第2配線対の間に接続されてもよい。
前記MAX(f0)は、600Hzでもよい。
前記逆変換器に構成されるスイッチング素子は、ワイドバンドギャップ半導体のデバイスでもよい。
a:電源周波数のn倍成分(nは、1以上の整数)
b:出力周波数の6倍成分
c:キャリア周波数±(出力周波数の3倍成分)
などが挙げられる。
2 コンバータ回路
3 直流リンク部
4 インバータ回路
4a スイッチング素子
5 制御部
6 交流電源
7 モータ
8 リアクトル
10 電装ユニット
15 筐体
15d 貫通孔
20 電力変換装置
31,32 配線
47 放熱器
60 基板
61,62,63,64,65,66 配線
80 接続部材
101 空気調和機
Claims (13)
- 前記逆変換器の駆動のキャリア周波数をfcとするとき、
前記インダクタンス成分と前記コンデンサとによるLCフィルタの前記キャリア周波数fcでのゲインは、0.1以下である、請求項1に記載の電力変換装置。 - 前記インダクタンス成分と前記コンデンサとによるLCフィルタの6×前記MAX(f0)でのゲインは、5以下である、請求項1又は2に記載の電力変換装置。
- 前記インダクタンス成分は、前記第1配線対のうちの一方もしくは両方の配線に又は前記第2配線対のうちの一方もしくは両方の配線に直列に挿入されたリアクトルを含み、
前記コンデンサは、前記リアクトルと前記逆変換器との間において、前記第1配線対の間又は前記第2配線対の間に接続された、請求項1から3のいずれか一項に記載の電力変換装置。 - 交流電源から第1配線対を介して入力される交流を直流に変換する変換器と、
前記変換器から第2配線対に出力される直流電力を交流電力に変換する逆変換器と、
前記第1配線対のうちの一方もしくは両方の配線に又は前記第2配線対のうちの一方もしくは両方の配線に直列に挿入されたリアクトルと、
前記リアクトルと前記逆変換器との間において、前記第1配線対の間又は前記第2配線対の間に接続されたコンデンサと、を備え、
前記逆変換器の駆動のキャリア周波数をfc、前記リアクトルと前記コンデンサとによるLCフィルタの共振周波数をfLC、前記逆変換器の出力周波数の最大値をMAX(f0)とするとき、MAX(f0)は、
- 前記キャリア周波数fcでの前記LCフィルタのゲインは、0.1以下である、請求項5に記載の電力変換装置。
- 6×前記MAX(f0)での前記LCフィルタのゲインは、5以下である、請求項5又は6に記載の電力変換装置。
- 前記リアクトルは、基板に実装された部品である、請求項4又は5に記載の電力変換装置。
- 前記コンデンサは、前記第2配線対の間に接続された、請求項1から8のいずれか一項に記載の電力変換装置。
- 前記MAX(f0)は、600Hzである、請求項1から9のいずれか一項に記載の電力変換装置。
- 前記逆変換器に構成されるスイッチング素子は、ワイドバンドギャップ半導体のデバイスである、請求項1から10のいずれか一項に記載の電力変換装置。
- 請求項1から11のいずれか一項に記載の電力変換装置を備える、空気調和機。
- 請求項1から11のいずれか一項に記載の電力変換装置を備える、冷凍装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202280014729.7A CN116868497A (zh) | 2021-03-31 | 2022-03-30 | 电力变换装置、空调机以及冷冻装置 |
EP22781160.1A EP4318921A1 (en) | 2021-03-31 | 2022-03-30 | Power conversion device, air conditioner, and refrigeration device |
US18/547,940 US20240235424A9 (en) | 2021-03-31 | 2022-03-30 | Power conversion apparatus, air conditioner and refrigeration apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021061704 | 2021-03-31 | ||
JP2021-061704 | 2021-03-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022210950A1 true WO2022210950A1 (ja) | 2022-10-06 |
Family
ID=82610409
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2022/016216 WO2022210950A1 (ja) | 2021-03-31 | 2022-03-30 | 電力変換装置、空気調和機及び冷凍装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20240235424A9 (ja) |
EP (1) | EP4318921A1 (ja) |
JP (1) | JP7108224B1 (ja) |
CN (1) | CN116868497A (ja) |
WO (1) | WO2022210950A1 (ja) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5329531A (en) * | 1976-08-31 | 1978-03-18 | Toshiba Corp | Filter circuit |
JPS57126276A (en) * | 1981-01-27 | 1982-08-05 | Toshiba Corp | Starting method for power converter |
JP2005020837A (ja) * | 2003-06-24 | 2005-01-20 | Takahashi Yuko | 多相電流供給回路 |
JP2005253282A (ja) | 2004-02-06 | 2005-09-15 | Matsushita Electric Ind Co Ltd | 電力変換装置及びモータ駆動用インバータ制御装置及び空気調和機 |
JP2008029151A (ja) * | 2006-07-24 | 2008-02-07 | Daikin Ind Ltd | インバータ装置 |
JP2021061704A (ja) | 2019-10-08 | 2021-04-15 | 株式会社Nttファシリティーズ | 充放電計画作成装置及び充放電計画作成方法 |
-
2022
- 2022-03-28 JP JP2022051552A patent/JP7108224B1/ja active Active
- 2022-03-30 EP EP22781160.1A patent/EP4318921A1/en active Pending
- 2022-03-30 US US18/547,940 patent/US20240235424A9/en active Pending
- 2022-03-30 WO PCT/JP2022/016216 patent/WO2022210950A1/ja active Application Filing
- 2022-03-30 CN CN202280014729.7A patent/CN116868497A/zh active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5329531A (en) * | 1976-08-31 | 1978-03-18 | Toshiba Corp | Filter circuit |
JPS57126276A (en) * | 1981-01-27 | 1982-08-05 | Toshiba Corp | Starting method for power converter |
JP2005020837A (ja) * | 2003-06-24 | 2005-01-20 | Takahashi Yuko | 多相電流供給回路 |
JP2005253282A (ja) | 2004-02-06 | 2005-09-15 | Matsushita Electric Ind Co Ltd | 電力変換装置及びモータ駆動用インバータ制御装置及び空気調和機 |
JP2008029151A (ja) * | 2006-07-24 | 2008-02-07 | Daikin Ind Ltd | インバータ装置 |
JP2021061704A (ja) | 2019-10-08 | 2021-04-15 | 株式会社Nttファシリティーズ | 充放電計画作成装置及び充放電計画作成方法 |
Also Published As
Publication number | Publication date |
---|---|
EP4318921A1 (en) | 2024-02-07 |
CN116868497A (zh) | 2023-10-10 |
US20240136949A1 (en) | 2024-04-25 |
US20240235424A9 (en) | 2024-07-11 |
JP7108224B1 (ja) | 2022-07-28 |
JP2022159095A (ja) | 2022-10-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6041862B2 (ja) | 電力変換装置 | |
JP5813781B2 (ja) | 半導体装置および電子機器 | |
WO2012070117A1 (ja) | モータ駆動回路 | |
US10600716B2 (en) | Power converter | |
CN111064321A (zh) | 电控组件及电器设备 | |
WO2022210950A1 (ja) | 電力変換装置、空気調和機及び冷凍装置 | |
JP6178178B2 (ja) | ノイズフィルタ | |
JP6289577B2 (ja) | 電力変換装置 | |
JP6821266B2 (ja) | 電力変換装置 | |
JP7571417B2 (ja) | 電力変換装置 | |
US11462997B2 (en) | DC to DC converter for a vehicle alternator | |
JPH11356047A (ja) | スイッチングレギュレータ電源装置 | |
EP3591829A1 (en) | Power conversion device | |
CN114208007A (zh) | 电路体和制冷循环装置 | |
JP7168884B2 (ja) | 空気調和機 | |
WO2023090263A1 (ja) | 電力変換装置及びその製造方法 | |
JP7275397B1 (ja) | バスバーモジュール及び電力変換システム | |
JP2018182880A (ja) | 電力変換装置 | |
JP7209898B2 (ja) | 電力変換装置、モータ駆動制御装置、送風機、圧縮機および空気調和機 | |
WO2024070456A1 (ja) | 電気回路 | |
JP2012010500A (ja) | 冷凍装置 | |
WO2013024686A1 (ja) | 電力変換回路および空気調和機 | |
JP2024106477A (ja) | プリント回路板、およびそれを有する空気調和装置 | |
JP2018129982A (ja) | 電力変換装置、電力変換システムならびに空気調和システム | |
JP2023128422A (ja) | 電力変換装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22781160 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202280014729.7 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 18547940 Country of ref document: US |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2301006126 Country of ref document: TH |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202317064922 Country of ref document: IN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2022781160 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2022781160 Country of ref document: EP Effective date: 20231031 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |