WO2018142738A1 - Climatiseur - Google Patents

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Publication number
WO2018142738A1
WO2018142738A1 PCT/JP2017/042719 JP2017042719W WO2018142738A1 WO 2018142738 A1 WO2018142738 A1 WO 2018142738A1 JP 2017042719 W JP2017042719 W JP 2017042719W WO 2018142738 A1 WO2018142738 A1 WO 2018142738A1
Authority
WO
WIPO (PCT)
Prior art keywords
inverter
compressor
fan
power
air conditioner
Prior art date
Application number
PCT/JP2017/042719
Other languages
English (en)
Japanese (ja)
Inventor
将志 大田
直哉 花野
孝 大石
Original Assignee
日立ジョンソンコントロールズ空調株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日立ジョンソンコントロールズ空調株式会社 filed Critical 日立ジョンソンコントロールズ空調株式会社
Publication of WO2018142738A1 publication Critical patent/WO2018142738A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/20—Electric components for separate outdoor units
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
    • F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans

Definitions

  • the present invention relates to an air conditioner.
  • the outdoor unit of the air conditioner is equipped with an inverter control circuit that supplies AC power supplied from an AC power source to the compressor motor and controls the motor.
  • Patent Document 1 discloses an inverter control circuit in which a power transistor module, a noise filter circuit, a diode stack, and a capacitor are mounted on a single substrate, thereby reducing the number of connected wires and reducing material costs and assembly costs. Is disclosed.
  • Patent Document 2 the electric parts constituting the inverter are arranged in a multi-layer structure, and the downsizing of the inverter, the number of wirings, etc. are reduced, thereby downsizing the outdoor unit that stores the inverter.
  • An outdoor unit of an air conditioner that achieves cost reduction is disclosed.
  • Patent Document 3 a control element for an air conditioner that incorporates a storage element storing unique data relating to characteristics and functions unique to each model into a control circuit, and reduces costs by using a common substrate. Is disclosed.
  • a compressor inverter that drives and controls a compressor motor and a fan inverter that drives and controls a fan motor are usually mounted on separate boards, and each board is electrically connected by a harness or the like. Connected to.
  • the fan inverter has a smaller rated current than the compressor inverter, and thus is easily affected by noise superimposed on the harness. For this reason, when the compressor inverter and the fan inverter are mounted on different boards, there is a problem in that a problem occurs in driving the fan motor and the performance of the air conditioner is degraded.
  • an object of the present invention is to prevent the performance of the air conditioner from being lowered or to improve the performance.
  • the present invention provides a converter that converts AC power supplied from an AC power source into DC power, a smoothing unit that smoothes the DC power, and the smoothed DC power into AC power.
  • a compressor inverter that converts and supplies the compressor motor to the compressor motor, converts the smoothed DC power into AC power, and supplies the fan motor with a fan inverter having a smaller rated current than the compressor inverter;
  • the converter, the smoothing unit, the compressor inverter, and the fan inverter are mounted on the same substrate.
  • the present invention it is possible to prevent the performance of the air conditioner from being lowered or to improve the performance.
  • the air conditioner 1 includes an indoor unit 100 and an outdoor unit 200.
  • the indoor unit 100 includes an indoor heat exchanger 11, an indoor expansion valve 12, and the like.
  • the outdoor unit 200 includes a compressor 21, a four-way valve 22, an outdoor heat exchanger 23, an accumulator 24, an outdoor expansion valve 25, and the like.
  • an indoor fan 13 for promoting heat exchange is provided, and the fan motor 13a drives the indoor fan 13.
  • An outdoor fan 26 for promoting heat exchange is provided in the vicinity of the outdoor heat exchanger 23, and the fan motor 26 a drives the outdoor fan 26. Further, the compressor motor 21a drives the compressor 21.
  • a plurality of outdoor fans may be provided in the vicinity of the outdoor heat exchanger 23.
  • the air conditioner 1 is a device that performs air conditioning (cooling operation, heating operation, etc.) by circulating a refrigerant in a heat pump cycle.
  • a compressor 21, a four-way valve 22, an outdoor heat exchanger 23, an outdoor expansion valve 25, an indoor expansion valve 12, an indoor heat exchanger 11, and an accumulator 24 are sequentially connected in an annular manner.
  • the refrigerant circuit Q thus formed the refrigerant is circulated by a known heat pump cycle.
  • the solid line arrow X indicates the refrigerant circulation direction when the air conditioner 1 performs the cooling operation
  • the broken line arrow Y indicates the refrigerant circulation direction when the air conditioner 1 performs the heating operation.
  • the air conditioner 1 when the air conditioner 1 performs a cooling operation, the high-temperature and high-pressure refrigerant compressed by the compressor 21 passes through the four-way valve 22 and flows into the outdoor heat exchanger 23, and by heat exchange with air, After being condensed and liquefied, the pressure is reduced by the indoor expansion valve 12 and flows into the indoor heat exchanger 11.
  • the refrigerant that has flowed into the indoor heat exchanger 11 evaporates due to heat absorption from the air, and then returns to the compressor 21 via the accumulator 24.
  • the refrigerant returned to the compressor 21 is compressed again to a high temperature and a high pressure, and circulates through the four-way valve 22, the outdoor heat exchanger 23, the outdoor expansion valve 25, the indoor expansion valve 12, the indoor heat exchanger 11, and the accumulator 24.
  • a heat pump cycle is configured by repeating this circulation.
  • the control board 2 includes a converter 201, a smoothing unit 202, a compressor inverter 203, a fan inverter 204, a control unit 205, a voltage detection circuit 206, a current detection circuit 207, a power supply circuit 208, and a driver.
  • a circuit 209, a current sensor 210, a discharge pressure sensor 211, and a discharge pressure detection circuit 212 are provided.
  • the current sensor 210, the discharge pressure sensor 211, and the discharge pressure detection circuit 212 are mounted on the same substrate.
  • the reference voltage VF in the DC unit I 0 is common to the compressor inverter 203 and the fan inverter 204.
  • a thick line indicates a power line, and a thin line indicates a signal line.
  • FIG. 2 the case where two fan inverters 204 are mounted on the control board 2 will be described as an example.
  • the number of fan inverters 204 mounted on the control board 2 is particularly limited. is not. It is possible to increase the number of fan inverters 204 mounted on the control board 2 by additionally connecting the fan inverters 204 to the DC unit I 0 shown in FIG.
  • the converter 201 includes a plurality of rectifying elements 251 and is a circuit in which the elements are bridge-connected.
  • the converter 201 converts the AC power supplied from the three-phase AC power source 220 into DC power via the noise filter 230 and supplies the converted DC power to the smoothing unit 202.
  • the smoothing unit 202 smoothes the DC voltage converted by the converter 201 and supplies the smoothed DC power to the compressor inverter 203 and the two fan inverters 204.
  • the smoothing unit 202 includes a smoothing capacitor 221, a power factor improving reactor 222, an electromagnetic contactor 223, and an inrush current limiting resistor 224.
  • the smoothing capacitor 221, the power factor improving reactor 222, the magnetic contactor 223, and the inrush current limiting resistor 224 are provided between the converter 201 and the compressor inverter 203 or the two fan inverters 204.
  • the power factor improving reactor 222 has one terminal connected to the smoothing capacitor 221 and the other terminal connected to the electromagnetic contactor 223 and the inrush current limiting resistor 224.
  • the electromagnetic contactor 223 and the inrush current limiting resistor 224 are provided in parallel so that the electromagnetic contactor 223 that is closed when the power is turned on does not weld due to an excessive inrush current flowing through the smoothing capacitor 221.
  • the compressor inverter 203 is connected to the converter 201 and the compressor motor 21a.
  • the compressor inverter 203 converts the DC power smoothed by the smoothing unit 202 into U-phase, V-phase, and W-phase three-phase AC power, and supplies it to the compressor motor 21a.
  • the compressor inverter 203 controls the drive of the compressor motor 21a by changing the rotation speed (operation frequency) of the compressor motor 21a based on the drive signal input from the driver circuit 209.
  • the compressor inverter 203 includes a plurality of switching elements 231 and a plurality of flywheel elements 232, and the switching elements 231 are three-phase bridge-connected circuits.
  • a flywheel element 232 is provided along with each switching element 231.
  • the flywheel element 232 regenerates counter electromotive force generated by the switching operation of the switching element 231.
  • the compressor inverter 203 controls the switching operation of each switching element 231 based on the drive signal input from the driver circuit 209, so that AC power is generated in the compressor inverter 203.
  • the rated current of the compressor inverter 203 is 20 [A] or more.
  • the rated current is the minimum value of the direct current that can be driven by the compressor inverter.
  • the fan inverter 204 is connected to the converter 201 and the fan motor 26a.
  • the fan inverter 204 converts the DC power smoothed by the smoothing unit 202 into U-phase, V-phase, and W-phase three-phase AC power and supplies it to the fan motor 26a. Further, the fan inverter 204 controls the drive of the fan motor 26a by changing the rotational speed (operation frequency) of the fan motor 26a based on the drive signal input from the control unit 205.
  • the fan inverter 204 includes a plurality of switching elements 241 and a plurality of flywheel elements 242, and the plurality of switching elements 241 are three-phase bridge-connected circuits.
  • a flywheel element 242 is provided along with each switching element 241.
  • the flywheel element 242 regenerates back electromotive force generated by the switching operation of the switching element 241. Further, the fan inverter 204 controls the switching operation of each switching element 241 based on the drive signal input from the control unit 205, whereby AC power is generated in the fan inverter 204.
  • the rated current of the fan inverter 204 is 1 ⁇ 4 or less of the rated current of the compressor inverter 203.
  • the rated current is the minimum value of the direct current that can be driven by the fan inverter.
  • the fan inverter has a smaller rated current than the compressor inverter.
  • the fan inverter electrically connects each board compared to the compressor inverter. It becomes easy to receive the influence of the noise superimposed on the harness required for the.
  • the compressor inverter, the fan inverter, the control unit, and the like are all mounted on the same control board 2, a harness for electrically connecting the boards is unnecessary, and the influence of noise Can be minimized.
  • the control unit 205 outputs a control signal to the driver circuit 209, and controls the compressor inverter 203 via the driver circuit 209.
  • the control unit 205 outputs a drive signal to the two fan inverters 204 to control the two fan inverters 204.
  • control unit 205 controls the opening degree of the indoor expansion valve 12 or the outdoor expansion valve 25, the rotational speeds of the indoor fan 13 and the outdoor fan 26, the four-way valve 22 for switching the cooling / heating operation mode, and the like.
  • the control unit 205 has a sensorless type vector control function. Therefore, the control unit 205 can estimate the rotation speed and phase (magnetic pole position) of the compressor motor 21a and the fan motor 26a.
  • the control unit 205 based on the current detected by the current detection circuit 207 (the current flowing through the DC portion I 0), it is possible to reproduce the driving current of the compressor motor 21a and a fan motor 26a. Thereby, since it is not necessary to mount a speed sensor, a magnetic pole position sensor, a current sensor for detecting an alternating current, and the like on the control board 2, the control board 2 can have a simple configuration.
  • the voltage detection circuit 206 detects the DC voltage output from the converter 201, confirms whether or not the detected DC voltage is an insufficient voltage, and outputs the detection result to the control unit 205.
  • the current detection circuit 207 detects the current flowing through the DC unit I 0 using the current sensor 210 and outputs the detection result to the control unit 205.
  • the power supply circuit 208 adjusts the DC voltage (high voltage) converted by the converter 201 and further smoothed by the smoothing unit 202 to, for example, a control voltage (low voltage) of about 5 [V] or 15 [V].
  • a control voltage low voltage
  • the driver circuit 209 is provided between the control unit 205 and the compressor inverter 203.
  • the driver circuit 209 amplifies a weak signal (for example, a PWM signal) input from the control unit 205 to a level at which the switching element 231 included in the compressor inverter 203 can be driven, and the drive signal is amplified by the compressor inverter 203.
  • a weak signal for example, a PWM signal
  • the switching element 231 provided in the compressor inverter 203 performs a switching operation, and the compressor inverter 203 is driven.
  • the switching element 231 provided in the compressor inverter 203 stops the switching operation, and the compressor inverter 203 stops.
  • the current sensor 210 is connected to the converter 201 and detects a current flowing through the DC unit I 0, that is, a DC current input to the compressor inverter 203 and the two fan inverters 204. Output to the detection circuit 207.
  • the control board 2 may be provided with a protection function against overcurrent and a protection function against a decrease in control voltage. When each protection function is activated, each circuit can output an abnormal signal to the control unit 205 to stop the compressor inverter 203 and the two fan inverters 204.
  • the discharge pressure sensor 211 is connected to the discharge pressure detection circuit 212, detects the discharge pressure of the compressor 21, and outputs the detected pressure to the discharge pressure detection circuit 212.
  • the discharge pressure sensor 211 performs a switching operation based on whether or not the discharge pressure is greater than or equal to a predetermined threshold value.
  • the discharge pressure detection circuit 212 detects the discharge pressure using the discharge pressure sensor 211 and outputs the detection result to the control unit 205.
  • the control board 2 is mounted with an inverter for compressor, two inverters for fan, a smoothing unit, a control unit, and the like. That is, the harness for electrically connecting the respective boards, which is required when the compressor inverter, the two fan inverters, the smoothing unit, the control unit, and the like are mounted on different substrates, is not necessary.
  • the fan inverter having a smaller rated current than the compressor inverter can be driven normally without being affected by noise superimposed on the harness. Therefore, it is possible to avoid the problems that have occurred in the conventional air conditioner, such as the fan inverter being stopped, heat exchange in the outdoor unit not being performed smoothly, and improving the performance of the air conditioner 1. it can.
  • the control board 2 with low cost and high reliability can be provided by controlling the inverter for compressor and the inverter for two fans by the same control unit, the performance of the air conditioner 1 is reduced. In addition to preventing, it can improve performance.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Inverter Devices (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

La présente invention comprend : un convertisseur qui convertit une puissance en courant alternatif fournie par une alimentation électrique en courant alternatif en une puissance en courant continu ; une unité de lissage qui lisse la puissance en courant continu ; un onduleur de compresseur qui convertit la puissance en courant continu lissée en une puissance en courant alternatif et fournit la puissance en courant alternatif à un moteur de compresseur ; et un onduleur de ventilateur qui convertit la puissance en courant continu lissée en une puissance en courant alternatif et fournit la puissance en courant alternatif à un moteur de ventilateur et qui a un courant nominal inférieur à celui de l'onduleur de compresseur. La présente invention est caractérisée en ce que le convertisseur, l'unité de lissage, l'onduleur de compresseur et l'onduleur de ventilateur sont tous montés sur un seul substrat.
PCT/JP2017/042719 2017-02-02 2017-11-29 Climatiseur WO2018142738A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-017486 2017-02-02
JP2017017486A JP2018125997A (ja) 2017-02-02 2017-02-02 空気調和機

Publications (1)

Publication Number Publication Date
WO2018142738A1 true WO2018142738A1 (fr) 2018-08-09

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PCT/JP2017/042719 WO2018142738A1 (fr) 2017-02-02 2017-11-29 Climatiseur

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WO (1) WO2018142738A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024053006A1 (fr) * 2022-09-07 2024-03-14 三菱電機株式会社 Unité extérieure pour climatiseur

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0835713A (ja) * 1994-07-26 1996-02-06 Fujitsu General Ltd 空気調和機の制御方法およびその装置
JPH11211194A (ja) * 1998-01-30 1999-08-06 Daikin Ind Ltd 室外機の制御装置
JP2003106605A (ja) * 2001-09-28 2003-04-09 Matsushita Electric Ind Co Ltd 空気調和機の制御装置
WO2016006106A1 (fr) * 2014-07-11 2016-01-14 日立アプライアンス株式会社 Unité extérieure de climatiseur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0835713A (ja) * 1994-07-26 1996-02-06 Fujitsu General Ltd 空気調和機の制御方法およびその装置
JPH11211194A (ja) * 1998-01-30 1999-08-06 Daikin Ind Ltd 室外機の制御装置
JP2003106605A (ja) * 2001-09-28 2003-04-09 Matsushita Electric Ind Co Ltd 空気調和機の制御装置
WO2016006106A1 (fr) * 2014-07-11 2016-01-14 日立アプライアンス株式会社 Unité extérieure de climatiseur

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JP2018125997A (ja) 2018-08-09

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