WO2022202829A1 - 空気調和機 - Google Patents
空気調和機 Download PDFInfo
- Publication number
- WO2022202829A1 WO2022202829A1 PCT/JP2022/013244 JP2022013244W WO2022202829A1 WO 2022202829 A1 WO2022202829 A1 WO 2022202829A1 JP 2022013244 W JP2022013244 W JP 2022013244W WO 2022202829 A1 WO2022202829 A1 WO 2022202829A1
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- WIPO (PCT)
- Prior art keywords
- indoor unit
- outdoor unit
- unit side
- input current
- current
- Prior art date
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- 239000003990 capacitor Substances 0.000 claims description 32
- 230000010349 pulsation Effects 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 claims description 8
- 230000002596 correlated effect Effects 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 description 19
- 230000000875 corresponding effect Effects 0.000 description 18
- 238000006243 chemical reaction Methods 0.000 description 12
- 238000005259 measurement Methods 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
-
- 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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M7/08—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode arranged for operation in parallel
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
Definitions
- the present disclosure relates to an air conditioner having an indoor unit and an outdoor unit.
- Patent Document 1 discloses a converter circuit that rectifies and outputs alternating current supplied from an alternating current power supply, an inverter circuit that converts the direct current output by the converter circuit into alternating current, and a circuit that is connected between input nodes of the inverter circuit.
- a power conversion device is disclosed having a capacitor with a .
- Patent Document 1 In general, electrical equipment equipped with a power converter such as that of Patent Document 1 is required to comply with harmonic standards such as IEC (International Electrotechnical Commission) 61000-3-2. Therefore, even when a power conversion device is provided in each of the indoor unit and the outdoor unit of an air conditioner, it is required to suppress harmonics generated by the air conditioner.
- harmonic standards such as IEC (International Electrotechnical Commission) 61000-3-2. Therefore, even when a power conversion device is provided in each of the indoor unit and the outdoor unit of an air conditioner, it is required to suppress harmonics generated by the air conditioner.
- the purpose of the present disclosure is to suppress harmonics generated by air conditioners.
- a first aspect of the present disclosure includes an indoor unit (10) and an outdoor unit (20), an indoor unit side power line (L2) and an outdoor unit side power line (L3), and the indoor unit side
- the power lines (L2, L3) on the outdoor unit side are branched from a common power line (L1) connected to the AC power supply (2), and the power line (L2) on the indoor unit side is connected to the indoor unit (10 ) and power is supplied to the outdoor unit (20) from a power line (L3) on the outdoor unit side, wherein the indoor unit (10) and the outdoor unit (20)
- Each device is a converter circuit (111, 211) that rectifies and outputs the alternating current sent from the AC power supply (2) to the power supply line (L2, L3) on the device side, and the converter circuit (111, 211) outputs an inverter circuit (112, 212) for converting a direct current into an alternating current;
- the sum of the effective values of the 2nd to 40th order integer order components contained in the indoor unit side input current (i in_ indoor unit ) and the outdoor unit side input current (i in_ outdoor unit ) is equal to the sum of the rms values of the 2nd to 40th integer components of the total current ( i_total ) , the sum of the 2nd to 40th integer order components of the total current ( i_total ), that is, the harmonics generated by the air conditioner (1) can be suppressed.
- a second aspect of the present disclosure is, in the first aspect, the sum of the effective values of the 15th to 40th integer order components of the indoor unit side input current (i in_indoor unit ), and the outdoor unit side of the 15th to 40th integer order components of the total current ( i_total ) than the sum of the sum of the effective values of the 15th to 40th integer order components of the input current (i in_ outdoor unit )
- the sum of effective values is small.
- the sum of the 15th to 40th integer order components of the total current ( i_total ), that is, the 15th to 40th harmonics generated by the air conditioner (1) can be suppressed.
- a third aspect of the present disclosure is, in the first or second aspect, the sum of the effective values of the 2nd to 40th order integer components of the input current (i in_indoor unit ) on the indoor unit side;
- the difference obtained by subtracting the sum of the effective values of is greater than 3/4 of the sum of the effective values of the 2nd to 40th integer order components of the input current on the indoor unit side (i in_ indoor unit ) .
- the third aspect compared to the case where the difference is 3/4 or less of the sum of the effective values of the second to 40th integer order components of the indoor unit side input current (i in_indoor unit ), the The sum of the 2nd to 40th integer order components of the total current ( i_total ), that is, the harmonics generated by the air conditioner (1) can be more effectively suppressed.
- a fourth aspect of the present disclosure is that, in any one of the first to third aspects, the total current ( i_total ) in at least one integer order among the 2nd to 40th orders is smaller than the effective value of the order component of the input current (i in_outdoor unit ) on the outdoor unit side.
- At least part of the component of the order included in the outdoor unit side input current (i in_ outdoor unit ) is the indoor unit side input current (i in_ Since it is canceled by the component of the order contained in the indoor unit ), the component of the order of the total current ( i_total ), that is, the harmonics of the order generated by the air conditioner (1) can be suppressed.
- a fifth aspect of the present disclosure is, in any one of the first to fourth aspects, the input current (i control means (217, 117c, 117d) for controlling at least one of the converter circuit (111, 211) and the inverter circuit (112, 212) of the other device based on the value correlated with the in_indoor unit , i in_outdoor unit ) .
- the other At least one of the converter circuit (111, 211) and the inverter circuit (112, 212) of the equipment is controlled.
- one of the indoor unit (10) and the outdoor unit (20) has a reactor (L),
- the alternating current is sent from the AC power supply (2) to the indoor unit side power line (L2) through the reactor (L), and the outdoor unit side power line (L3) is supplied with the AC power supply
- the alternating current is sent from (2) through the reactor (L).
- both the converter circuit (111) on the indoor unit (10) side and the converter circuit (211) on the outdoor unit (20) side are fed from the single-phase AC power supply (2) via the reactor (L). Since alternating current is supplied to the converter circuit (111) on the indoor unit (10) side, the indoor unit (10 ) side converter circuit (111) can suppress harmonic components superimposed on the input current. As a result, the sum of the input currents of the converter circuit (111) on the indoor unit (10) side and the converter circuit (211) on the outdoor unit (20) side, that is, the harmonics superimposed on the input current of the entire air conditioner (1) components can be suppressed.
- the inverter circuit (212) on the outdoor unit (20) side includes switching elements (212a to 212f).
- the direct current output by the converter circuit (211) on the outdoor unit (20) side is converted into alternating current by the switching operation of the switching elements (212a to 212f), and the converter circuit (211) on the outdoor unit (20) side has a large ripple such that its maximum value is more than twice its minimum value.
- the capacitance of the capacitor (213) on the outdoor unit (20) side should be made smaller than when the pulsation is completely absorbed. Must be set.
- the outdoor unit (20) side capacitor (213) completely absorbs the pulsation of the output voltage of the outdoor unit (20) side converter circuit (211)
- the outdoor unit (20) side The energization period during the half cycle of the input voltage of the converter circuit (211) can be lengthened.
- the energization period is lengthened, the harmonic components contained in the input current are reduced, so the inductance of the reactor (L) required to obtain a predetermined suppressing effect of the harmonic components can be reduced. Therefore, the size of the reactor (L) can be reduced.
- the indoor unit (10) has the reactor (L), the reactor (L), the A converter circuit (111) on the indoor unit (10) side, an inverter circuit (112) on the indoor unit (10) side, and a capacitor (113) on the indoor unit (10) side are mounted on a common substrate (100). It is
- the board for mounting the reactor (L) includes the converter circuit (111) on the indoor unit (10) side, the inverter circuit (112) on the indoor unit (10) side, and the indoor unit (10)
- the space required in the indoor unit (10) can be reduced compared to the case where it is provided in the indoor unit (10) separately from the board for mounting the side capacitor (113), so the indoor unit (10) can be made smaller. can.
- a ninth aspect of the present disclosure is any one aspect of the first aspect to the eighth aspect, wherein a plurality of the indoor units (10) are provided, and the power line (L2) on the side of the indoor unit is The indoor unit is provided for each unit (10) and branched from the common power line (L1) and flows through the plurality of indoor unit side power lines (L2) provided for each of the plurality of indoor units (10).
- FIG. 1 is a circuit diagram showing the configuration of an air conditioner according to Embodiment 1.
- FIG. FIG. 2 is a functional block diagram showing configurations of an indoor unit side controller and an outdoor unit side controller.
- FIG. 3 is a timing chart showing the input current and input voltage of the indoor unit side converter circuit.
- FIG. 4 is a timing chart illustrating command values of total current.
- FIG. 5 is a graph showing harmonic components superimposed on the input current on the indoor unit side.
- FIG. 6 is a graph showing the ratio of harmonic components superimposed on the input current of the indoor unit with respect to the limit value of harmonic components defined by IEC61000-3-2.
- FIG. 7 is a view corresponding to FIG. 2 of the second embodiment.
- FIG. 8 is a view corresponding to FIG. 7 of the third embodiment.
- FIG. 9 is a view corresponding to FIG. 2 of the fourth embodiment.
- FIG. 10 is a view corresponding to FIG. 1 of the fifth embodiment.
- FIG. 11 is a view corresponding to FIG. 2 of the fifth embodiment.
- 4 is a timing chart illustrating command values and measured values of input current on the outdoor unit side;
- FIG. 13 is a view corresponding to FIG. 1 of the sixth embodiment.
- 14 is a timing chart showing the input current and input voltage of the indoor unit side converter circuit in Comparative Example 1.
- FIG. FIG. 15 is a graph showing frequency components of each order superimposed on the input current of the indoor unit side converter circuit in the example and the first comparative example.
- FIG. 16 is a graph showing the limit values of harmonic components defined by IEC61000-3-2 and the frequency components of each order superimposed on the input current of the converter circuit on the outdoor unit side in Comparative Example 2.
- FIG. 17 is a graph showing the limit value of harmonic components defined by IEC61000-3-2 and the frequency components of each order superimposed on the input current of the converter circuit on the outdoor unit side in Comparative Example 3.
- FIG. 18 is a graph showing the limits of harmonic components defined by IEC61000-3-2 and the frequency components of each order superimposed on the input current of the air conditioner in Comparative Example 2.
- FIG. FIG. 19 is a view corresponding to FIG. 1 of the seventh embodiment.
- FIG. 1 shows an air conditioner (1) according to Embodiment 1 of the present disclosure.
- This air conditioner (1) includes an indoor unit (10), an outdoor unit (20), and first to third power lines (L1 to L3).
- the indoor unit (10) includes an indoor unit side power converter (11), a fan motor (12), and an indoor unit side housing (not shown).
- the indoor unit side power conversion device (11) and the fan motor (12) are accommodated in the indoor unit side housing.
- the outdoor unit (20) includes an outdoor unit side power conversion device (21), a compressor motor (22), and an outdoor unit side housing (not shown).
- the outdoor unit side power conversion device (21) and the compressor motor (22) are accommodated in the outdoor unit side housing.
- the first power line (L1) is connected to the single-phase AC power supply (2).
- the first power line (L1) is drawn into the indoor unit side housing of the indoor unit (10).
- the first power line (L1) branches into second and third power lines (L2, L3) within the indoor unit (10). Power is supplied from the second power line (L2) to the indoor unit side power conversion device (11) of the indoor unit (10).
- the third power line (L3) is drawn into the outdoor unit side housing of the outdoor unit (20). Electric power is supplied from the third power line (L3) to the outdoor unit side power converter (21) of the outdoor unit (20).
- the first power line (L1) constitutes a common power line
- the second power line (L2) constitutes the power line on the indoor unit side
- the third power line (L3) constitutes the power line on the outdoor unit side. compose lines.
- the indoor unit side power conversion device (11) converts the alternating current sent from the single-phase alternating current power supply (2) to the second power supply line (L2) into alternating current having a desired frequency and a desired voltage, and drives the fan motor ( 12).
- the indoor unit side power conversion device (11) includes an indoor unit side converter circuit (111), an indoor unit side inverter circuit (112), an indoor unit side capacitor (113), an indoor unit side input current It has a measurement section (114), an indoor unit side DC current measurement section (115), an indoor unit side DC voltage measurement section (116), and an indoor unit side control section (117).
- the indoor unit side converter circuit (111) rectifies the alternating current sent from the single-phase AC power supply (2) to the second power line (L2) and supplies it to the first and second indoor unit side DC power lines (118, 119). Output.
- the indoor unit side converter circuit (111) has first and second indoor unit side input terminals (ITE1, ITE2). Alternating current is input from the power line (L2).
- the indoor unit side converter circuit (111) has first to fourth indoor unit side rectifying diodes (111a to 111d) connected in a bridge configuration. These first to fourth indoor unit side rectifying diodes (111a to 111d) have their cathodes directed toward the first indoor unit side DC power line (118) and their anodes directed toward the second indoor unit side DC power line (118).
- the first and second indoor unit side rectifying diodes are connected between the first and second indoor unit side DC power lines (118, 119) in order from the first indoor unit side DC power line (118) side. They are connected in series and their contacts are connected to the first indoor unit side input terminal (ITE1).
- the third and fourth indoor unit side rectifying diodes are connected between the first and second indoor unit side DC power lines (118, 119) in order from the first indoor unit side DC power line (118) side. They are connected in series and their contacts are connected to the second indoor unit side input terminal (ITE2).
- the indoor-unit-side inverter circuit (112) converts the direct current output by the indoor-unit-side converter circuit (111) into alternating current through a switching operation and supplies the alternating current to the fan motor (12).
- the indoor unit side inverter circuit (112) has six indoor unit side switching elements (112a to 112f) and six indoor unit side reflux diodes (112g).
- Six indoor unit side switching elements (112a to 112f) are bridge-connected. More specifically, the indoor unit side inverter circuit (112) has three switching legs connected between the first and second indoor unit side DC power lines (118, 119). A switching leg is formed by connecting two indoor unit side switching elements (112a to 112f) in series.
- the midpoint between the upper arm indoor unit side switching elements (112a, 112c, 112e) and the lower arm indoor unit side switching elements (112b, 112d, 112f) is the fan motor (12). are connected to each phase coil (u-phase, v-phase, and w-phase coils).
- One indoor unit side free wheel diode (112g) is connected in anti-parallel to each indoor unit side switching element (112a to 112f).
- the indoor unit side capacitor (113) is connected between the input nodes (IN1, IN2) of the indoor unit side inverter circuit (112), that is, between the first and second indoor unit side DC power lines (118, 119).
- the indoor unit side capacitor (113) is connected in parallel to each of the indoor unit side converter circuit (111) and the indoor unit side inverter circuit (112).
- the indoor unit side capacitor (113) is a smoothing capacitor for smoothing the output voltage of the indoor unit side converter circuit (111).
- the indoor unit side input current measuring section (114) measures the indoor unit side input current (i in_indoor unit ) flowing through the second power line (L2).
- the indoor unit side input current measuring section (114) is provided on the second indoor unit side DC power line (119).
- the indoor unit side DC current measuring section (115) measures the indoor unit side DC current ( idc_indoor unit ) input to the indoor unit side inverter circuit (112).
- the indoor unit side DC voltage measuring section (116) measures the DC voltage (DC link voltage) (v dc_indoor unit ) of the indoor unit side capacitor (113).
- the indoor unit side control unit (117) is configured using a microcomputer and a memory device that stores software for controlling it. As shown in FIG. 2, the indoor unit side controller (117) includes an indoor unit side motor controller (117a) and a measured value transmitter (117b).
- the indoor unit side motor control section (117a) determines the rotation speed of the fan motor (12) based on the measured values of the indoor unit side DC current measuring section (115) and the indoor unit side DC voltage measuring section (116).
- Each switching element (112a to 112f) of the inverter circuit (112) on the indoor unit side is controlled by a control signal ( G_indoor unit ) so as to obtain the specified command value.
- the measured value transmitter (117b) transmits the indoor unit input current (i in_indoor unit ) measured by the indoor unit input current measurer (114) to the outdoor unit (20).
- the fan motor (12) is driven by the alternating current supplied by the indoor unit side power converter (11).
- the outdoor unit side power converter (21) includes a reactor (L), an outdoor unit side converter circuit (211), an outdoor unit side inverter circuit (212), and an outdoor unit side capacitor (213 ), an outdoor unit side input current measurement unit (214), an outdoor unit side DC current measurement unit (215), an outdoor unit side DC voltage measurement unit (216), and an outdoor unit side control unit (217 ) and
- the reactor (L) is provided on the third power line (L3). That is, one end of the reactor (L) is connected to the single-phase AC power supply (2) via the first power supply line (L1). On the other hand, the other end of the reactor (L) is connected to a later-described second outdoor unit side input terminal (OTE2) of the outdoor unit side converter circuit (211).
- OTE2 second outdoor unit side input terminal
- the outdoor unit side converter circuit (211) rectifies the alternating current sent from the single-phase AC power supply (2) to the third power line (L3) and supplies it to the first and second outdoor unit side DC power lines (218, 219). Output.
- the outdoor unit side converter circuit (211) has first and second outdoor unit side input terminals (OTE1, OTE2). Alternating current is input from the power line (L3).
- the outdoor unit side converter circuit (211) is a bridge circuit having first to fourth outdoor unit side rectifying diodes (211a to 211d) connected in a bridge configuration.
- first to fourth outdoor unit side rectifying diodes have their cathodes directed toward the first outdoor unit side DC power line (218) and their anodes directed toward the second outdoor unit side DC power line ( 219) facing to the side.
- the first and second outdoor unit side rectifying diodes (211a, 211b) are connected between the first and second outdoor unit side DC power lines (218, 219) in order from the first outdoor unit side DC power line (218) side. They are connected in series and their contacts are connected to the first outdoor unit side input terminal (OTE1).
- the third and fourth outdoor unit side rectifying diodes are connected between the first and second outdoor unit side DC power lines (218, 219) in order from the first outdoor unit side DC power line (218) side. They are connected in series, and their contacts are connected to the second outdoor unit side input terminal (OTE2).
- the outdoor unit side inverter circuit (212) converts the direct current output by the outdoor unit side converter circuit (211) into alternating current through a switching operation, and supplies the alternating current to the compressor motor (22).
- the outdoor unit side inverter circuit (212) has six outdoor unit side switching elements (212a to 212f) and six outdoor unit side free wheel diodes (212g).
- Six outdoor unit side switching elements (212a to 212f) are bridge-connected.
- the outdoor unit side inverter circuit (212) has three switching legs connected between the first and second outdoor unit side DC power lines (218, 219). A switching leg is formed by connecting two outdoor unit side switching elements (212a to 212f) in series.
- each of the three switching legs the midpoint between the upper arm outdoor unit side switching element (212a, 212c, 212e) and the lower arm outdoor unit side switching element (212b, 212d, 212f) is the compressor motor ( 22) is connected to each phase coil (u-phase, v-phase, and w-phase coils).
- Each outdoor unit side switching element (212a to 212f) is connected in anti-parallel with one outdoor unit side free wheel diode (212g).
- the outdoor unit side capacitor (213) is connected between the input nodes (ON1, ON2) of the outdoor unit side inverter circuit (212), that is, between the first and second outdoor unit side DC power lines (218, 219).
- the outdoor unit side capacitor (213) is connected in parallel to each of the outdoor unit side converter circuit (211) and the outdoor unit side inverter circuit (212).
- the voltage of the outdoor unit side capacitor (213) pulsates according to the frequency of the input AC supplied from the single-phase AC power supply (2).
- the capacity of the outdoor unit side capacitor (213) is due to the switching operation of the outdoor unit side inverter circuit (212), although the outdoor unit side capacitor (213) can hardly smooth the output voltage of the outdoor unit side converter circuit (211). It is set so as to suppress fluctuations in the input current of the outdoor unit side converter circuit (211).
- the capacitance value of the outdoor unit side capacitor (213) is about several tens of ⁇ F, and the output voltage of the outdoor unit side converter circuit (211) has a large pulsation such that the maximum value is more than twice the minimum value. have.
- the outdoor unit side input current measuring section (214) measures the outdoor unit side input current (i in_outdoor unit ) flowing through the third power line (L3).
- the outdoor unit side input current measuring section (214) is provided on the second outdoor unit side DC power line (219).
- the outdoor unit side DC current measuring section (215) measures the outdoor unit side DC current ( idc_outdoor unit ) input to the outdoor unit side inverter circuit (212).
- the outdoor unit side DC voltage measuring section (216) measures the DC voltage (DC link voltage) (v dc_outdoor unit ) of the outdoor unit side capacitor (213).
- the outdoor unit side control unit (217) is configured using a microcomputer and a memory device that stores software for controlling it. As shown in FIG. 2, the outdoor unit side control section (217) includes an input current command section (217a), a compensation amount calculation section (217b), a subtraction section (217c), a speed control section (217d), It comprises a current command calculator (217e), an adder (217f), a coordinate converter (217g), a dq-axis current controller (217h), and a PWM calculator (217i).
- the input current command unit (217a) receives the indoor unit side input current (i in_indoor unit ) transmitted by the measured value transmission unit (117b) of the indoor unit (10).
- a total current command value (i* _total ) (see FIG. 4) is set in advance in the input current command section (217a).
- the input current command section (217a) subtracts the indoor unit side input current (i in_indoor unit ) from the total current command value (i*_total), and converts it to the outdoor unit side input current. command value (i in * _ outdoor unit ).
- command value (i* _total ) of the total current can be obtained, for example, by using the phase of the fundamental wave of the time and the power supply voltage as arguments, and the phase of the fundamental wave of the time and the power supply voltage and the current value (command value). is set based on a table showing combinations of
- the compensation amount calculator (217b) calculates the outdoor unit side input current command value (i in * _outdoor unit ) and the outdoor unit side input current (i q-axis current command compensation amount (i comp *) is calculated and output so that the deviation from the measured value of in_outdoor unit ) becomes small.
- the compensation amount calculation unit (217b) is based on the deviation between the command value of the input current on the outdoor unit side (i in * _outdoor unit) and the measured value of the input current on the outdoor unit side (i in_outdoor unit ) , for example, by performing PI calculation (proportional integration), the q-axis current command compensation amount (i comp *) is obtained.
- the subtractor (217c) calculates the deviation between the rotation speed ( ⁇ ) of the compressor motor (22) and the rotation speed command value ( ⁇ *).
- the rotation speed ( ⁇ ) of the compressor motor (22) is the direct current (i dc_outdoor unit ) on the outdoor unit side measured by the outdoor unit side DC current measuring unit (215) and the direct current on the outdoor unit side. It can be calculated based on the voltage (v dc_outdoor unit ) and the output (G _outdoor unit) of the PWM calculation unit (217i) (described later).
- the DC current on the outdoor unit side (i dc_outdoor unit ), the DC voltage on the outdoor unit side (v dc_outdoor unit ), and the output of the PWM calculation unit (217i) (G _outdoor unit ) are compressed.
- the magnetic pole position of the compressor motor (22) can be estimated from these values and the motor constant.
- the differential value of the magnetic pole position of the compressor motor (22) is the electrical angular frequency of the compressor motor (22), and the rotational speed ( ⁇ ) of the compressor motor (22) is this electrical angular frequency. It is a value obtained by dividing by the number of pole pairs of the compressor motor (22).
- the speed control section (217d) performs, for example, PID calculations (proportionality, integration, differentiation) based on the deviation between the rotation speed ( ⁇ ) of the compressor motor (22) and the rotation speed command value ( ⁇ *). , to generate an average motor torque command value (hereinafter referred to as average torque command value (T m *)).
- the current command calculator (217e) derives the inverter power based on the input current command value (i in * _outdoor unit) of the outdoor unit calculated by the input current command unit (217a), and calculates the inverter power.
- the command value of the q-axis current (i q ) (hereinafter referred to as the q-axis current command value (i q *))
- the pulsation command value (i p *) that is the basis of Inverter power can be derived, for example, based on the method disclosed in Japanese Patent Application Laid-Open No. 2019-68731.
- the adder (217f) calculates the pulsation command value (i p *) generated by the current command calculator (217e) and the q-axis current command compensation amount (i comp *) obtained by the compensation amount calculator (217b). are added, and the addition result is output as the q-axis current command value (i q *).
- the coordinate transformation unit (217g) converts the u-phase current (i u ) and w-phase current (i w ) of the compressor motor (22) based on the electrical angle (motor phase) of the rotor (not shown). , so-called dq conversion is performed to derive the d-axis current (i d ) and the q-axis current (i q ) of the compressor motor (22).
- the u-phase current (i u ) and w-phase current (i w ) can be directly detected by, for example, providing a current sensor, and the direct current (i dc_outdoor unit ) on the outdoor unit side and the output ( G_outdoor unit) of the PWM calculation unit (217i).
- the dq-axis current control unit (217h) controls the d-axis current command value (i d *), the q-axis current command value (i q *), the d-axis current (i d ), and the q-axis current (i q ). to derive the d-axis voltage command value (v d *) and the q-axis voltage command value (v q *).
- the dq-axis current control section (217h) controls the deviation between the d-axis current command value (i d *) and the d-axis current (i d ), the q-axis current command value and the q-axis current (i q ), the d-axis voltage command value (v d *) and the q-axis voltage command value (v q *) are derived.
- the PWM calculation unit (217i) generates a control signal ( G_outdoor unit) for controlling on/off of the outdoor unit side switching elements (212a to 212f) of the outdoor unit side inverter circuit (212). Specifically, the PWM calculation unit (217i) calculates the motor phase, the DC voltage on the outdoor unit side (v dc_outdoor unit ), the d-axis voltage command value (v d *), the q-axis voltage command value (v q * ), and the magnetic pole position of the compressor motor (22), the duty ratio of the control signal ( G_outdoor unit) supplied to each of the switching elements (212a-212f) is set.
- each switching element (212a to 212f) When the control signal (G_outdoor unit ) is output, each switching element (212a to 212f) performs a switching operation (on/off operation) at a duty ratio set by the PWM calculation section (217i). This control signal ( G_outdoor unit ) is periodically updated to control the switching operation in the outdoor unit side inverter circuit (212).
- the compressor motor (22) is driven by the alternating current supplied by the outdoor unit side power converter (21).
- the measured value of the indoor unit side controller (117)
- the transmitter (117b) transmits the indoor unit input current (i in_indoor unit ) measured by the indoor unit input current measuring unit (114) to the outdoor unit (20).
- the input current command section (217a) of the outdoor unit side control section (217) subtracts the indoor unit side input current (i in_indoor unit ) from the preset total current command value (i* _total ). is calculated as the command value for the input current on the outdoor unit side (i in * _outdoor unit ).
- the compensation amount calculation unit (217b) determines that the deviation between the command value of the input current on the outdoor unit side (i in * _outdoor unit) and the measured value of the input current on the outdoor unit side (i in_outdoor unit ) is The q-axis current command compensation amount (i comp *) is calculated and output so as to be small.
- the adder (217f) adds the q-axis current command compensation amount (i comp *) and the pulsation command value (i p *) generated by the current command calculator (217e), and calculates the addition result as the q-axis current Output as a command value (i q *).
- the dq-axis current control section (217h) and the PWM calculation section (217i) cause the outdoor unit side switching element (212a) of the outdoor unit side inverter circuit (212) to 212f) is controlled on/off.
- the outdoor unit side control section (217) determines the indoor input current (i in_indoor unit ) and the outdoor unit side input current (i in_indoor unit)
- the outdoor unit side inverter circuit (212) is controlled so that the deviation between the sum of the input current (i in_outdoor unit ) and the preset total current command value (i* _total ) is reduced.
- the input current ( i in _ indoor unit ) and the input current on the outdoor unit side (i in_ outdoor unit ), the total current flowing through the first power supply line (L1) (i* _total ) 2nd to 40th integer order components becomes smaller.
- i in_indoor unit the k-th component contained in the input current on the indoor unit side (i in_indoor unit ) is replaced by the k-th component in the input current on the i k_ indoor unit side and the outdoor unit is i k_outdoor unit
- i k_total the k-th component included in the total current (i_total)
- FIG. 5 shows harmonic components superimposed on the input current (i in_indoor unit ) on the indoor unit side.
- the harmonic components superimposed on the input current of the indoor unit side converter circuit (111) are obtained by performing a fast Fourier transform (FFT) on the indoor unit side input current (i in_indoor unit ). be done.
- FFT fast Fourier transform
- FIG. 6 is a graph showing the ratio of harmonic components superimposed on the indoor unit side input current (i in_indoor unit ) with respect to the limit value of harmonic components defined by IEC61000-3-2.
- the ratio of harmonic components superimposed on the indoor unit side input current (i in_indoor unit ) with respect to the limit value of harmonic components stipulated by IEC61000-3-2 is the third to thirteenth
- the 15th to 39th odd-order components are higher than the following odd-order components.
- the sum of the effective values of the 15th to 40th integer order components of the input current on the indoor unit side (i in_indoor unit ) and the 15th to 15th of the outdoor unit side input current (i in_outdoor unit ) By controlling the sum of the effective values of the 15th to 40th order integer order components of the total current ( i_total ) to be smaller than the sum of the sum of the rms values of the 40th order integer order components, IEC61000 - It is easy to adapt the air conditioner (1) to 3-2. Therefore, control is performed so that the following formula (2) holds.
- the sum of the effective values of the 2nd to 40th integer order components of the input current on the indoor unit side (i in_ indoor unit ) and the 2nd to 40th of the input current on the outdoor unit side (i in_outdoor unit ) The difference obtained by subtracting the sum of the rms values of the 2nd to 40th order integer order components of the total current ( i_total ) from the sum of the sum of the rms values of the following integer order components is the input to the indoor unit. It is larger than 3/4 of the sum of the effective values of the 2nd to 40th integer order components of the current (i in_indoor unit ). That is, the following formula (3) holds.
- the total current ( i_total ), that is, the harmonics generated by the air conditioner (1) can be more effectively suppressed.
- the effective value of the component of the order of the total current (i_total) is the input current (i in_outdoor unit ) on the outdoor unit side is smaller than the effective value of the component of the corresponding order of In other words, if k is an integer of at least one of the 2nd to 40th orders, the following equation (4) holds.
- At least part of the component of the order included in the outdoor unit side input current (i in_ outdoor unit ) is the indoor unit side input current (i in_ indoor unit ), the component of the total current ( i_total ), that is, the harmonics of the order generated by the air conditioner (1) can be suppressed.
- the ratio of the harmonic components to the limit value is When the 21st-order component is remarkably large, at least the 21st-order component is controlled so that the corresponding order component of the total current ( i_total ) is reduced.
- the sum of the effective values of the 2nd to 40th order integer order components included in the indoor unit side input current (i in_indoor unit ) and the outdoor unit side input current (i sum of the sum of the rms values of the 2nd to 40th order integer components contained in the in_outdoor unit ) and the sum of the rms values of the 2nd to 40th order integer components of the total current ( i_total ) are equal to each other, the sum of the 2nd to 40th integer order components of the total current ( i_total ), that is, the harmonics generated by the air conditioner (1) can be suppressed.
- FIG. 7 is a view corresponding to FIG. 2 of the second embodiment.
- the indoor unit side controller (117) includes a fast Fourier transform section (117c) instead of the measured value transmitter (117b).
- the fast Fourier transform unit (117c) performs a fast Fourier transform on the measured value of the indoor unit input current (i in_indoor unit) to obtain the indoor unit input current (i in_indoor unit ).
- Amplitude (i m ) and phase information ( ⁇ s ) are calculated and transmitted to the outdoor unit (20).
- the phase information ( ⁇ s ) at this time is the phase based on the time when the phase of the fundamental wave of the power supply voltage is 0 degree.
- the outdoor unit side control section (217) further includes a restoration section (217j).
- the restorer (217j) restores the indoor unit side input current (i in_ indoor unit ) is restored and output to the input current command section (217a).
- the input current (i in_indoor unit) of the indoor unit is restored based on the amplitude (i m ) and the phase information ( ⁇ s ) with reference to the phase of the fundamental wave of the power supply voltage.
- the fast Fourier transform section (117c) and the outdoor unit side control section (217) constitute control means.
- FIG. 8 is a view corresponding to FIG. 7 of the third embodiment.
- the indoor unit side controller (117) further includes a current estimator (117d).
- the current estimator (117d) measures the measured values of the indoor unit side DC current measurement unit (115) and the indoor unit side DC voltage measurement unit (116), that is, the indoor unit side DC current (i dc_indoor unit ) and the indoor unit Based on the DC voltage (v dc_indoor unit ) on the side, the input current (i in_indoor unit ) on the indoor unit side is estimated and output to the fast Fourier transform unit (117c).
- the DC current on the indoor unit side (i dc_in_ indoor unit ) is i in_indoor unit
- the input current on the indoor unit side (i in_indoor unit ) can be estimated by the following equation (5).
- the fast Fourier transform section (117c), the current estimation section (117d), and the outdoor unit side control section (217) constitute control means.
- FIG. 9 is a view corresponding to FIG. 7 of the fourth embodiment.
- the indoor unit side controller (117) includes an air volume transmitter (117e) instead of the measured value transmitter (117b).
- the air volume transmitter (117e) transmits the measured value of the air volume (av) of the fan (not shown) driven by the fan motor (12) of the indoor unit (10) to the outdoor unit (20).
- the measured value of the air volume (av) is measured by an air volume measuring section (not shown) provided in the indoor unit (10).
- the outdoor unit side control section (217) further includes an input current output section (217k).
- This input current output unit (217k) stores a plurality of tables that associate a plurality of types of fundamental wave phases with input currents on the indoor unit side corresponding to the respective phases, in association with a plurality of types of air volumes. .
- the input current output section (217k) selects an appropriate table based on the air volume (av) transmitted by the air volume transmitter (117e), and the associated input current within the table based on the phase of the fundamental wave of the power supply voltage.
- the current is output to the input current command section (217a) as the input current (i in_indoor unit ) on the indoor unit side.
- FIG. 10 is a view corresponding to FIG. 1 of the fifth embodiment.
- the outdoor unit side converter circuit (211) further includes a boost converter (220).
- the boost converter (220) performs DC/DC conversion on the output of the bridge circuit having the first to fourth outdoor unit side rectifier diodes (211a to 211d).
- the boost converter (220) includes a converter reactor (221), a converter diode (222), a converter switching element (223), and a converter freewheeling diode (224).
- the converter reactor (221) and the converter diode (222) are connected between the cathodes of the first and third outdoor unit side rectifier diodes (211a, 211c) and the positive electrode of the outdoor unit side capacitor (213).
- the first and third outdoor unit side rectifier diodes (211a, 211c) are connected in series with each other in order.
- the converter diode (222) has its cathode directed toward the outdoor unit side capacitor (213).
- the converter switching element (223) is a bipolar transistor. A collector of the converter switching element (223) is connected to a contact point between the converter reactor (221) and the converter diode (222). The emitter of the converter switching element (223) is connected to the anodes of the second and fourth outdoor unit side rectifier diodes (211b, 211d) and the negative electrode of the outdoor unit side capacitor (213).
- the outdoor unit side control section (217) includes an input current command section (217a) and a converter control section (217m).
- the converter control section (217m) measures the measured value of the outdoor unit side input current measurement section (214), that is, the outdoor unit side input current (i in_outdoor unit ) and the outdoor unit side input current command value (i in * _outdoor unit ) and outputs an on/off signal (S) that turns on/off the converter switching element (223).
- the converter control section (217m) converts the measured value of the outdoor unit side input current measuring section (214), that is, the outdoor unit side input current (i in_outdoor unit ) into the outdoor unit side input current command value (i in * _ outdoor unit ) by a predetermined value larger than the first threshold, by turning off the converter switching element (223), the input current (i in_ outdoor unit ) on the outdoor unit side Decrease.
- the converter control section (217m) measures the value measured by the outdoor unit side input current measuring section (214), that is, the outdoor unit side input current (i in_outdoor unit ) to the outdoor unit side input current command value ( i in * _outdoor unit), by turning on the converter switching element (223), the input current on the outdoor unit side (i in_outdoor unit ).
- FIG. 12 shows the input current on the outdoor unit side (i in_outdoor unit ), the command value of the input current on the outdoor unit side (i in *_outdoor unit ), the first threshold, and the second threshold.
- the converter control section ( 217m ) of the outdoor unit side control section (217) provides a preset total current command value ( The command value of the input current on the outdoor unit side (i in_ outdoor unit ) and the input current on the outdoor unit side (i in_ The outdoor unit side converter circuit (211) is controlled so that the deviation of the outdoor unit is within a predetermined value.
- FIG. 13 is a view corresponding to FIG. 1 of the sixth embodiment.
- the reactor (L) is provided in the indoor unit (10) instead of the outdoor unit (20).
- a reactor (L) is housed in the indoor unit side housing.
- One end of the reactor (L) is connected to a single-phase AC power supply (2), while the other end of the reactor (L) is connected to an indoor unit side power converter (11) and an outdoor unit side power converter (to be described later). 21) and connected to. That is, alternating current is sent to the second and third power lines (L2, L3) from the alternating current power supply (2) via the reactor (L).
- the indoor unit side power conversion device (11) converts the input AC supplied from the single-phase AC power supply (2) through the reactor (L) into the output AC having the desired frequency and voltage, and the fan motor ( 12).
- the reactor (L), the indoor unit side converter circuit (111), the indoor unit side inverter circuit (112), and the indoor unit side capacitor (113) are mounted on a common substrate (100).
- the indoor unit side converter circuit (111) rectifies the input AC supplied from the single-phase AC power supply (2) through the reactor (L) and outputs it to the first and second indoor unit side DC power lines (118, 119). do.
- a reactor (L) is connected between the single-phase AC power supply (2) and the first indoor unit side input terminal (ITE1).
- the outdoor unit side converter circuit (211) rectifies the input AC supplied from the single-phase AC power supply (2) through the reactor (L) and outputs it to the first and second outdoor unit side DC power lines (218, 219). do.
- a reactor (L) is connected between the single-phase AC power supply (2) and the first outdoor unit side input terminal (OTE1).
- alternating current is supplied from the single-phase alternating current power supply (2) to both the indoor unit side converter circuit (111) and the outdoor unit side converter circuit (211) through the reactor (L). Therefore, compared to the case where the indoor unit converter circuit (111) is supplied with AC from the single-phase AC power supply (2) without passing through the reactor (L), the input current of the indoor unit converter circuit (111) is It is possible to suppress superimposed harmonic components. As a result, it is possible to suppress the sum of the input currents of the indoor unit side converter circuit (111) and the outdoor unit side converter circuit (211), that is, the harmonic component superimposed on the input current of the entire air conditioner (1).
- the input current of the indoor unit side converter circuit (111) is measured in the air conditioner (1) according to the sixth embodiment.
- FIG. 14 shows the input voltage and input current of the indoor unit side converter circuit (111) in Comparative Example 1.
- FIG. 14 shows the input voltage and input current of the indoor unit side converter circuit (111) in Comparative Example 1.
- FIG. 15 shows frequency components of each order superimposed on the input current of the indoor unit side converter circuit (111) in the embodiment and the first comparative example.
- the frequency component superimposed on the input current of the indoor unit converter circuit (111) is obtained by subjecting the input current of the indoor unit converter circuit (111) to fast Fourier transform (FFT).
- FFT fast Fourier transform
- the high-order harmonic components superimposed on the input current of the indoor unit side converter circuit (111) are smaller than in the first comparative example.
- the indoor unit side converter circuit (111) when the indoor unit side converter circuit (111) is supplied with alternating current from the single-phase AC power supply (2) via the reactor (L), the indoor unit side converter circuit ( 111), compared to the case where AC is supplied from the single-phase AC power supply (2) without passing through the reactor (L), the high-order harmonic components superimposed on the input current of the indoor unit side converter circuit (111) are reduced. It tells us that we can control it.
- the input AC is supplied from the single-phase AC power supply (2) to the indoor unit side converter circuit (111) without passing through the reactor (L), and the outdoor unit side converter circuit (211) is supplied with the single phase
- the input alternating current is supplied from the AC power supply (2) through the reactor (L) and the inductance of the reactor (L) is set to the first inductance value
- the input of the outdoor unit side converter circuit (211) Measure the current.
- FIG. 16 shows the limit values of harmonic components specified by IEC (International Electrotechnical Commission) 61000-3-2 and the frequency components of each order superimposed on the input current of the outdoor unit side converter circuit (211) in Comparative Example 2. indicates 16 to 18, line graphs show the limits of harmonic components defined by IEC61000-3-2, and bar graphs show the frequency components of each order superimposed on each input current.
- IEC International Electrotechnical Commission
- the input AC is supplied from the single-phase AC power supply (2) to the indoor unit side converter circuit (111) without passing through the reactor (L), and the outdoor unit side converter circuit (211) is supplied with the single phase
- the outdoor unit Measure the input current of the side converter circuit (211).
- FIG. 17 shows the limit values of harmonic components defined by IEC61000-3-2 and the frequency components of each order superimposed on the input current of the outdoor unit side converter circuit (211) in Comparative Example 3.
- the comparative examples 2 and 3 show that when the inductance of the reactor (L) is reduced, the high-order harmonic components superimposed on the input current of the outdoor unit side converter circuit (211) increase. be.
- the input AC is supplied from the single-phase AC power supply (2) to the indoor unit side converter circuit (111) without passing through the reactor (L), and the outdoor unit side converter circuit (211)
- the indoor unit side converter circuit (111) and the outdoor unit side converter circuit (211 ) that is, the input current of the air conditioner (1) cannot conform to the harmonic standard IEC61000-3-2.
- the AC is supplied to the indoor unit side converter circuit (111) from the single-phase AC power supply (2) via the reactor (L), so the AC is supplied without the reactor (L).
- the inductance of the reactor (L) required for conforming the input current of the air conditioner (1) to the harmonic standard can be reduced compared to the case of Therefore, the reactor (L) can be miniaturized.
- the reactor (L) due to the miniaturization of the reactor (L), it is possible to mount the reactor (L) on a common board with the indoor unit side converter circuit (111), the indoor unit side inverter circuit (112), and the indoor unit side capacitor (113). , and it becomes easy to secure a space for accommodating the reactor (L) in the indoor unit side housing of the indoor unit (10).
- the reactor (L), the indoor unit side converter circuit (111), the indoor unit side inverter circuit (112), and the indoor unit side capacitor (113) are mounted on the common substrate (100). Separate the board for mounting the reactor (L) from the board for mounting the indoor unit side converter circuit (111), the indoor unit side inverter circuit (112), and the indoor unit side capacitor (113). 10), the required space in the indoor unit (10) can be reduced compared to the case where it is installed in the indoor unit (10). Therefore, the size of the indoor unit (10) can be reduced.
- the capacity of the outdoor unit side capacitor (213) is set small to allow pulsation of the output voltage of the outdoor unit side converter circuit (211).
- the energization period during the half cycle of the input voltage of the outdoor unit side converter circuit (211) can be lengthened. If the energization period is lengthened, the harmonic components contained in the input current are reduced, so the inductance of the reactor (L) required to obtain the desired effect of suppressing the harmonic components can be reduced. can be made smaller.
- the common reactor (L) suppresses harmonics of the input currents of the indoor unit side converter circuit (111) and the outdoor unit side converter circuit (211). may not be provided corresponding to each of the indoor unit side converter circuit (111) and the outdoor unit side converter circuit (211). Therefore, the number of parts and cost can be reduced.
- FIG. 19 is a view corresponding to FIG. 1 of the seventh embodiment.
- the air conditioner (1) has two indoor units (10), and the second power line (L2), that is, the power line on the indoor unit side, is provided for each indoor unit (10). provided and branched from a common power line (L1). Then, power is supplied from each second power supply line (L2) to the indoor unit side power conversion device (11) of the corresponding indoor unit (10).
- the measured value transmission section (117b) of the indoor unit side control section (117) of each indoor unit (10) measures the indoor unit side input current measured by the indoor unit side input current measuring section (114).
- a current (i in_indoor unit 1 , i in_indoor unit 2 ) is transmitted to the outdoor unit (20).
- the input current command section (217a) of the outdoor unit side control section (217) determines the indoor unit side input current (i in_ indoor unit 1 , i in _
- the value obtained by subtracting the total of the indoor unit 2 ) is calculated as the command value (i in * _outdoor unit ) of the input current on the outdoor unit side.
- the k-th order component contained in the indoor unit side input current (i in_indoor unit 1 ) flowing through one second power line (L1) is expressed as i k_indoor unit 1 and the other second
- the indoor unit side input current (i in_indoor unit 1 ) flowing through the power line (L1) is set to i k_indoor unit 2
- the following equation (6) holds.
- the control of the outdoor unit side converter circuit (211) or the outdoor unit side inverter circuit (212) is controlled by the indoor unit side input current (i in_indoor unit , i in_indoor unit 1 , i in_ indoor unit 2 ), the direct current on the indoor unit side (i dc_ indoor unit ), the voltage of the indoor unit side capacitor (113) (v dc_ indoor unit ), and the power of the fan driven by the fan motor (12) It was based on the measured value of at least one of the air volumes, but other values correlated with the input current on the indoor unit side (i in_indoor unit , i in_indoor unit 1 , i in_indoor unit 2 ) You can do it based on For example, fan power, fan rotation speed, input current on the indoor unit side (i in_ indoor unit , i in_ indoor unit 1 , i in_ indoor unit 2 ) energization period, or air conditioner (1) It may be performed
- the air conditioner (1) based on the measured value correlated to the indoor unit side input current (i in_indoor unit , i in_indoor unit 1 , i in_indoor unit 2 ) A control means is provided for controlling the outdoor unit side converter circuit (211) or the outdoor unit side inverter circuit (212).
- the indoor unit side converter circuit (111) and the indoor unit side inverter circuit (112) Control means may be provided for controlling at least one of them.
- the present invention is applied to the air conditioner (1) using the single-phase AC power supply (2), but the present invention is applied to the air conditioner (1) using the three-phase AC power supply.
- the first power supply line (L1) may be supplied with electricity after being distributed by a switchboard that draws in electricity from the system power supply, or, for example, like a commercial air conditioner, an indoor unit ( 10) and the outdoor unit (20) are connected to different switchboards, respectively, the first power line (L1) is connected to the system power supply without passing through the switchboard, and the second line is connected to the system power supply side of the switchboard. and the third power supply line (L2, L3).
- the reactor (L) is provided only in the indoor unit (10), but may be provided only in the outdoor unit (20).
- the alternating current may be sent to the second and third power lines (L2, L3) from the alternating current power supply (2) via the reactor (L).
- the reactor (L) is provided on the first power line (L1) in one of the indoor units (10) instead of the outdoor unit (20), and on the second and third power lines (L2, L3), The alternating current may be sent from an alternating current power supply (2) via a reactor (L).
- Embodiment 7 two indoor units (10) are provided, but two or more indoor units (10) may be provided.
- the present invention may be applied to adapt the air conditioner (1) to standards other than IEC (International Electrotechnical Commission) 61000-3-2. It can also be applied to incompatible air conditioners (1).
- IEC International Electrotechnical Commission
- the present disclosure is useful as an air conditioner equipped with an indoor unit and an outdoor unit.
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Abstract
Description
図1は、本開示の実施形態1に係る空気調和機(1)を示す。この空気調和機(1)は、室内機(10)及び室外機(20)と、第1~第3の電源線(L1~L3)とを備える。
図7は、実施形態2の図2相当図である。本実施形態2では、室内機側制御部(117)が、測定値送信部(117b)に代えて、高速フーリエ変換部(117c)を備えている。
図8は、実施形態3の図7相当図である。本実施形態3では、室内機側制御部(117)が、電流推定部(117d)をさらに備えている。
図9は、実施形態4の図7相当図である。本実施形態4では、室内機側制御部(117)が、測定値送信部(117b)に代えて、風量送信部(117e)を備えている。
図10は、実施形態5の図1相当図である。本実施形態5では、室外機側コンバータ回路(211)が、ブーストコンバータ(220)をさらに備えている。
図13は、実施形態6の図1相当図である。本実施形態6では、リアクトル(L)が、室外機(20)ではなく室内機(10)に設けられている。リアクトル(L)は、前記室内機側筐体に収容されている。
図19は、実施形態7の図1相当図である。本実施形態7では、空気調和機(1)が、室内機(10)を2つ有し、第2の電源線(L2)、すなわち室内機側の電源線が、室内機(10)毎に設けられて共通の電源線(L1)から分岐している。そして、各第2の電源線(L2)から対応する室内機(10)の室内機側電力変換装置(11)へ電力が供給される。
上記実施形態1~7では、室外機側コンバータ回路(211)又は室外機側インバータ回路(212)の制御を、室内機側の入力電流(iin_室内機,iin_室内機1,iin_室内機2)、室内機側の直流電流(idc_室内機)、室内機側コンデンサ(113)の電圧(vdc_室内機)、及びファンモータ(12)によって駆動されるファンの風量のうちの少なくとも1つの測定値に基づいて行ったが、室内機側の入力電流(iin_室内機,iin_室内機1,iin_室内機2)に相関する他の値に基づいて行ってもよい。例えば、ファンの電力、ファンの回転数、室内機側の入力電流(iin_室内機,iin_室内機1,iin_室内機2)の通電期間、又は空気調和機(1)のリモコンにより設定される設定値に基づいて行ってもよい。例えば、実施形態4において、室外機側インバータ回路(212)の制御が、ファンの風量(av)の測定値に代えて、空気調和機(1)のリモコンにより設定される設定値を用いて行われるようにしてもよい。
2 単相交流電源
10 室内機
20 室外機
111 室内機側コンバータ回路
112 室内機側インバータ回路
113 室内機側コンデンサ
117c 高速フーリエ変換部(制御手段)
117d 電流推定部(制御手段)
211 室外機側コンバータ回路
212 室外機側インバータ回路
213 室外機側コンデンサ
217 室外機側制御部(制御手段)
L1 第1の電源線(共通の電源線)
L2 第2の電源線(室内機側の電源線)
L3 第3の電源線(室外機側の電源線)
IN1,IN2 入力ノード
ON1,ON2 入力ノード
iin_室内機,iin_室内機1,iin_室内機2 室内機側の入力電流
iin_室外機 室外機側の入力電流
i_合計 合計電流
Claims (9)
- 室内機(10)及び室外機(20)と、室内機側の電源線(L2)と室外機側の電源線(L3)とを有し、前記室内機側及び室外機側の電源線(L2,L3)は、交流電源(2)に接続される共通の電源線(L1)から分岐し、前記室内機側の電源線(L2)から前記室内機(10)へ電力が供給され、前記室外機側の電源線(L3)から前記室外機(20)に電力が供給される空気調和機であって、
前記室内機(10)及び前記室外機(20)の各機器は、
前記交流電源(2)から当該機器側の電源線(L2,L3)に送られた交流を整流して出力するコンバータ回路(111,211)と、
前記コンバータ回路(111,211)により出力された直流を交流に変換するインバータ回路(112,212)と、
前記インバータ回路(112,212)の入力ノード(IN1,IN2,ON1,ON2)間に接続されたコンデンサ(113,213)とを有し、
前記室内機側の電源線(L2)を流れる室内機側の入力電流(iin_室内機)に含まれる第2~40次の整数次成分の実効値の合計と、前記室外機側の電源線(L3)を流れる室外機側の入力電流(iin_室外機)に含まれる第2~40次の整数次成分の実効値の合計との和よりも、前記室内機側の入力電流(iin_室内機)と前記室外機側の入力電流(iin_室外機)とを合計した前記共通の電源線(L1)を流れる合計電流(i_合計)の第2~40次の整数次成分の実効値の合計が小さい空気調和機。 - 請求項1に記載の空気調和機において、
前記室内機側の入力電流(iin_室内機)の第15~40次の整数次成分の実効値の合計と、前記室外機側の入力電流(iin_室外機)の第15~40次の整数次成分の実効値の合計との和よりも、前記合計電流(i_合計)の第15~40次の整数次成分の実効値の合計が小さい空気調和機。 - 請求項1又は2に記載の空気調和機において、
前記室内機側の入力電流(iin_室内機)の第2~40次の整数次成分の実効値の合計と、前記室外機側の入力電流(iin_室外機)の第2~40次の整数次成分の実効値の合計との和から前記合計電流(i_合計)の第2~40次の整数次成分の実効値の合計を引くことで得られる差分は、前記室内機側の入力電流(iin_室内機)の第2~40次の整数次成分の実効値の合計の3/4よりも大きい空気調和機。 - 請求項1~3のいずれか1項に記載の空気調和機において、
第2~40次のうちの少なくとも1つの整数の次数において、前記合計電流(i_合計)の当該次数の成分の実効値が、前記室外機側の入力電流(iin_室外機)の当該次数の成分の実効値よりも小さい空気調和機。 - 請求項1~4のいずれか1項に記載の空気調和機において、
前記室内機(10)及び室外機(20)のいずれか一方の機器側の入力電流(iin_室内機,iin_室外機)に相関する値に基づいて、他方の機器のコンバータ回路(111,211)及びインバータ回路(112,212)の少なくとも一方を制御する制御手段(217,117c,117d)を備える空気調和機。 - 請求項1~5のいずれか1項に記載の空気調和機において、
前記室内機(10)及び室外機(20)の一方は、リアクトル(L)を有し、
前記室内機側の電源線(L2)には、前記交流電源(2)から前記リアクトル(L)を介して前記交流が送られ、
前記室外機側の電源線(L3)には、前記交流電源(2)から前記リアクトル(L)を介して前記交流が送られる空気調和機。 - 請求項1~6のいずれか1項に記載の空気調和機において、
前記室外機(20)側のインバータ回路(212)は、スイッチング素子(212a~212f)を備え、前記室外機(20)側のコンバータ回路(211)により出力された直流を前記スイッチング素子(212a~212f)のスイッチング動作により交流に変換し、
前記室外機(20)側のコンバータ回路(211)の出力電圧は、その最大値がその最小値の2倍以上となるような大きな脈動を有している空気調和機。 - 請求項1~7のいずれか1項に記載の空気調和機において、
前記室内機(10)が、前記リアクトル(L)を有し、
前記リアクトル(L)、前記室内機(10)側のコンバータ回路(111)、前記室内機(10)側のインバータ回路(112)、及び前記室内機(10)側のコンデンサ(113)は、共通の基板(100)に実装されている空気調和機。 - 請求項1~8のいずれか1項に記載の空気調和機において、
前記室内機(10)を複数有し、
前記室内機側の電源線(L2)は、室内機(10)毎に設けられて前記共通の電源線(L1)から分岐し、
前記複数の室内機(10)毎に設けられた複数の前記室内機側の電源線(L2)を流れる室内機側の入力電流(iin_室内機1,iin_室内機2)に含まれる第2~40次の整数次成分の実効値の合計と、前記室外機側の電源線(L3)を流れる室外機側の入力電流(iin_室外機)に含まれる第2~40次の整数次成分の実効値の合計との和よりも、前記複数の室内機(10)毎に設けられた複数の前記室内機側の電源線(L2)を流れる室内機側の入力電流(iin_室内機1,iin_室内機2)と前記室外機側の入力電流(iin_室外機)とを合計した前記共通の電源線(L1)を流れる合計電流(i_合計)の第2~40次の整数次成分の実効値の合計が小さい空気調和機。
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JP2004364491A (ja) * | 2003-05-09 | 2004-12-24 | Sanyo Electric Co Ltd | 電源システム及び空気調和装置 |
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