EP3680566B1 - Klimaanlage - Google Patents

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Publication number
EP3680566B1
EP3680566B1 EP17924638.4A EP17924638A EP3680566B1 EP 3680566 B1 EP3680566 B1 EP 3680566B1 EP 17924638 A EP17924638 A EP 17924638A EP 3680566 B1 EP3680566 B1 EP 3680566B1
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EP
European Patent Office
Prior art keywords
unit
outdoor
indoor
terminal
relay
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17924638.4A
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English (en)
French (fr)
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EP3680566A4 (de
EP3680566A1 (de
Inventor
Kazushige Sawada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Publication date
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Publication of EP3680566A1 publication Critical patent/EP3680566A1/de
Publication of EP3680566A4 publication Critical patent/EP3680566A4/de
Application granted granted Critical
Publication of EP3680566B1 publication Critical patent/EP3680566B1/de
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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
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/38—Failure diagnosis
    • 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • 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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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

Definitions

  • the present invention relates to an air conditioner that includes an indoor unit and an outdoor unit.
  • an indoor unit and an outdoor unit are generally configured to be connected together via three wires, i.e., a power line, a signal line, and a power/signal common line.
  • Patent Literature 1 described below discloses an air conditioner having such a configuration.
  • Patent Literature 1 In conventional air conditioners exemplified in Patent Literature 1 below, when the air conditioner is turned on or the air conditioner in the operation standby state is resumed, commercial power is applied from the indoor unit to the outdoor unit to activate the outdoor unit while an inrush-current prevention relay of the outdoor unit is operated.
  • the outdoor unit activated initiates and establishes communication with the indoor unit.
  • the air conditioner performs again the control of applying commercial power from the indoor unit to the outdoor unit to attempt to establish communication.
  • Patent Literature 1 Japanese Patent Application Laid-open No. 2010-243051
  • document JP 2014-202459A relates to an air conditioner having an indoor unit and an outdoor unit communicating with each other.
  • the present invention has been achieved in view of the above and an object of the present invention is to provide an air conditioner that can prevent a failure of an outdoor-unit circuit that may occur due to re-application of commercial power.
  • an air conditioner defined by claim 1 includes, inter alia, an indoor unit and an outdoor unit.
  • the indoor unit activates the outdoor unit.
  • the indoor unit determines whether communication is capable of being established between the indoor unit and the outdoor unit.
  • the indoor unit performs self-reception of receiving a first signal generated by the indoor unit.
  • the indoor unit determines whether to reactivate the outdoor unit on a basis of a result of the self-reception.
  • the air conditioner according to the present invention provides an advantage in that a failure of an outdoor-unit circuit that may occur due to re-application of commercial power can be prevented.
  • connection An air conditioner according to embodiments of the present invention will be explained below in detail with reference to the accompanying drawings.
  • the present invention is not limited to the following embodiments.
  • “physical connection” and “electrical connection” are not distinguished from each other and are simply referred to as “connection”.
  • FIG. 1 is a block diagram illustrating an electrical system of an air conditioner according to an embodiment.
  • an air conditioner 100 in the embodiment includes an outdoor unit 1 and an indoor unit 2 that activates the outdoor unit 1.
  • FIG. 1 particularly illustrates a connection state before the outdoor unit 1 is activated.
  • the outdoor unit 1 and the indoor unit 2 are connected together via three lines, i.e., a power line 24, a power/signal common line 25, and a signal line 26.
  • the outdoor unit 1 is connected to a three-phase alternating-current (AC) power supply 3.
  • a three-phase AC voltage is applied to the outdoor unit 1 via power lines 65.
  • a single-phase AC voltage is applied from two of the power lines 65 to the indoor unit 2 via the power line 24 and the power/signal common line 25.
  • the air conditioner 100 according to the embodiment is configured such that the outdoor unit 1 is supplied with three-phase AC power and the indoor unit 2 is supplied with single-phase AC power.
  • the indoor unit 2 includes an indoor control unit 4 and an outdoor activation relay 8.
  • the outdoor activation relay 8 opens and closes a connection between the power line 24 and the signal line 26.
  • the wording "open and close a connection" indicates switching between the unconnected state and the connected state.
  • the indoor control unit 4 controls the outdoor activation relay 8 such that single-phase AC power is supplied between the signal line 26 and the power/signal common line 25.
  • the outdoor unit 1 includes an outdoor rectifier unit 9, a first inrush-current prevention relay 10, a power supply relay 12, a second inrush-current prevention relay 13, a smoothing capacitor 14, an inverter circuit unit 15, and an outdoor control unit 16.
  • the outdoor unit 1 further includes a communication-circuit power supply unit 18, an outdoor communication circuit unit 19, a power supply switch relay 20, an inrush-current-prevention-relay drive unit 21, and a compressor 80.
  • the compressor 80 is driven by the inverter circuit unit 15.
  • the outdoor rectifier unit 9 is connected to the power supply relay 12.
  • the power supply relay 12 opens and closes a connection between the three-phase AC power supply 3 and the outdoor rectifier unit 9.
  • the outdoor rectifier unit 9 rectifies the output of the three-phase AC power supply 3.
  • the smoothing capacitor 14 smooths the output of the outdoor rectifier unit 9.
  • the outdoor communication circuit unit 19 communicates with the indoor unit 2 via the power/signal common line 25 and the signal line 26.
  • the power supply switch relay 20 is connected between the power/signal common line 25 and the communication-circuit power supply unit 18.
  • the inrush-current-prevention-relay drive unit 21 When a single-phase AC voltage applied between the power/signal common line 25 and the signal line 26 is supplied to the inrush-current-prevention-relay drive unit 21 via the outdoor activation relay 8 of the indoor unit 2 and the power supply switch relay 20, the inrush-current-prevention-relay drive unit 21 operates.
  • the first inrush-current prevention relay 10 is connected in parallel to the power supply relay 12 and is controlled by the inrush-current-prevention-relay drive unit 21.
  • the second inrush-current prevention relay 13 is connected in parallel to the first inrush-current prevention relay 10 and is controlled by the outdoor control unit 16.
  • the outdoor unit 1 includes an outdoor terminal block 23.
  • the outdoor terminal block 23 includes an R terminal 27, an S terminal 28, a T terminal 29, an outdoor S1 terminal 30, an outdoor S2 terminal 31, and an outdoor S3 terminal 32.
  • the R terminal 27, the S terminal 28, and the T terminal 29 are connected to the three-phase AC power supply 3.
  • the power from the three-phase AC power supply 3 is supplied to the outdoor unit 1 via the R terminal 27, the S terminal 28, and the T terminal 29.
  • the outdoor S1 terminal 30 is connected to the R terminal 27 and the outdoor S2 terminal 31 is connected to the S terminal 28. With these connections, single-phase AC power is supplied to the communication-circuit power supply unit 18 via the outdoor S1 terminal 30 and the outdoor S2 terminal 31.
  • the power supplied to the outdoor S1 terminal 30 and the outdoor S2 terminal 31 is not limited to single-phase power between the R terminal 27 and the S terminal 28 and can be single-phase power between any two of the three phases of the three-phase AC power supply 3.
  • the indoor unit 2 includes an indoor terminal block 22.
  • the indoor terminal block 22 includes an indoor S1 terminal 33, an indoor S2 terminal 34, and an indoor S3 terminal 35.
  • the indoor S1 terminal 33 is connected to the outdoor S1 terminal 30 via the power line 24.
  • the indoor S2 terminal 34 is connected to the outdoor S2 terminal 31 via the power/signal common line 25.
  • the indoor S3 terminal 35 is connected to the outdoor S3 terminal 32 via the signal line 26.
  • the indoor unit 2 includes an indoor rectifier unit 5, an indoor communication circuit unit 6, an indoor operation switching unit 7, and a remote control receiving unit 36.
  • the outdoor activation relay 8 includes a terminal a, a terminal b, and a terminal c.
  • the terminal a is connected to the indoor S1 terminal 33.
  • the terminal b is connected to the indoor communication circuit unit 6.
  • the terminal c is a base of the outdoor activation relay 8 and is connected to the indoor S3 terminal 35.
  • the contact of the outdoor activation relay 8 is connected to either the terminal a or the terminal b. In other words, the outdoor activation relay 8 switches whether to connect the indoor S3 terminal 35 to the indoor S1 terminal 33 or to the indoor communication circuit unit 6.
  • the outdoor activation relay 8 When the outdoor activation relay 8 is OFF, the contact of the outdoor activation relay 8 is connected to the terminal b and thus the indoor S3 terminal 35 is connected to the indoor communication circuit unit 6 via the outdoor activation relay 8. With this connection, a communication line is established between the outdoor unit 1 and the indoor unit 2 via the power/signal common line 25 and the signal line 26; therefore, the outdoor unit 1 and the indoor unit 2 exchange various operation signals.
  • the indoor S1 terminal 33 is connected to the indoor rectifier unit 5.
  • the indoor S2 terminal 34 is connected to the indoor rectifier unit 5 and the indoor communication circuit unit 6.
  • a single-phase AC voltage applied between the power line 24 and the power/signal common line 25 is converted into a direct-current (DC) voltage by the indoor rectifier unit 5 and the power is supplied to the indoor control unit 4.
  • DC direct-current
  • the indoor operation switching unit 7 connected to the indoor control unit 4 determines whether to reduce the standby power that is the power consumed by the outdoor unit 1 during operation standby.
  • the example in FIG. 1 is a case where whether to reduce the standby power is determined depending on the connection state of jumper wires.
  • the indoor operation switching unit 7 when a jumper wire is connected between a terminal c1 and a terminal c2, the standby power is reduced, and when a jumper wire is connected between the terminal c2 and a terminal c3, the standby power is not reduced. Whether to reduce the standby power can be switched by a switch instead of using jumper wires.
  • the remote control receiving unit 36 is connected to a remote controller 37 and the indoor control unit 4.
  • the remote control receiving unit 36 receives an operation command from the remote controller 37 and transmits the received command to the indoor control unit 4.
  • the outdoor unit 1 further includes an inrush-current prevention resistor 11 and an outdoor operation switching unit 17.
  • the R terminal 27 in the outdoor unit 1 is connected to one end of each of the first inrush-current prevention relay 10 and the second inrush-current prevention relay 13 and to the terminal a that is one of the terminals on one side of the power supply relay 12.
  • the other end of each of the first inrush-current prevention relay 10 and the second inrush-current prevention relay 13 is connected to one end of the inrush-current prevention resistor 11.
  • the other end of the inrush-current prevention resistor 11 is connected to the outdoor rectifier unit 9 and to the terminal b that is one of the terminals on the other side of the power supply relay 12. Both ends of each of the first inrush-current prevention relay 10 and the second inrush-current prevention relay 13 are connected to the outdoor operation switching unit 17.
  • the S terminal 28 is connected to the terminal c that is another of the terminals on one side of the power supply relay 12.
  • a terminal d that is another of the terminals on the other side of the power supply relay 12 is connected to the outdoor rectifier unit 9.
  • the T terminal 29 is connected to the outdoor rectifier unit 9 without passing through the power supply relay 12.
  • the terminal a and the terminal c that are terminals on one side of the power supply relay 12 are respectively connected to the R terminal 27 and the S terminal 28; however, there is no limitation thereto. It is sufficient if any two of the R terminal 27, the S terminal 28, and the T terminal 29 are connected to the terminal a and the terminal c of the power supply relay 12.
  • a circuit unit is configured from a parallel circuit of the first inrush-current prevention relay 10 and the second inrush-current prevention relay 13 and the inrush-current prevention resistor 11 connected in series with the parallel circuit.
  • the circuit unit is connected at one end to the terminal a and connected at the other end to the terminal b in FIG. 1 ; however, there is no limitation thereto.
  • the circuit unit may be connected at one end to the terminal c and connected at the other end to the terminal d. In other words, it is sufficient if one end and the other end of the circuit unit are connected to the input and output of any one of the contacts in the power supply relay 12.
  • the power supply relay 12 is illustrated as a two-contact relay; however, the power supply relay 12 may be configured from two single-contact relays.
  • the outdoor rectifier unit 9 rectifiers the AC voltage from the three-phase AC power supply 3 to convert it into a given DC voltage.
  • the power supply relay 12 and the second inrush-current prevention relay 13 are operated under the control of the outdoor control unit 16. When the power supply relay 12 and the second inrush-current prevention relay 13 are not in operation, their contacts are open as illustrated in FIG. 1 .
  • the outdoor operation switching unit 17 is connected to both ends of the first inrush-current prevention relay 10 and is also connected to the outdoor control unit 16.
  • the outdoor operation switching unit 17 determines whether to reduce the standby power during operation standby.
  • the example in FIG. 1 is a case where whether to reduce the standby power is determined depending on the connection state of jumper wires.
  • the outdoor operation switching unit 17 when a jumper wire is connected between a terminal a1 and a terminal a2, the standby power during operation standby is reduced.
  • these terminals b1 and b2 form a current path bypassing the first inrush-current prevention relay 10.
  • Information indicating whether to reduce the standby power during operation standby is transmitted from the outdoor operation switching unit 17 to the outdoor control unit 16.
  • Both ends of the smoothing capacitor 14 are connected to the outdoor rectifier unit 9.
  • the DC voltage smoothed by the smoothing capacitor 14 is applied to the inverter circuit unit 15 and the outdoor control unit 16.
  • the power supply switch relay 20 includes a terminal a, a terminal b, and a terminal c.
  • the terminal a is connected to the communication-circuit power supply unit 18.
  • the terminal b is connected to the inrush-current-prevention-relay drive unit 21.
  • the terminal c is connected to the outdoor S2 terminal 31.
  • the terminal c is a base of the power supply switch relay 20 and is connected to the outdoor S2 terminal 31.
  • the contact of the power supply switch relay 20 is connected to either the terminal a or the terminal b. In other words, the power supply switch relay 20 switches whether to connect the outdoor S2 terminal 31 to the inrush-current-prevention-relay drive unit 21 or to the communication-circuit power supply unit 18.
  • the outdoor control unit 16 controls the power supply switch relay 20.
  • the power supply switch relay 20 When the power supply switch relay 20 is OFF, the contact of the power supply switch relay 20 is connected to the terminal b and thus the outdoor S2 terminal 31 is connected to the inrush-current-prevention-relay drive unit 21 via the power supply switch relay 20.
  • the inrush-current-prevention-relay drive unit 21 is energized. Energization of the inrush-current-prevention-relay drive unit 21 causes the contact of the first inrush-current prevention relay 10 to close.
  • the contact of the power supply switch relay 20 is connected to the terminal a.
  • the outdoor S2 terminal 31 is connected to the communication-circuit power supply unit 18 via the power supply switch relay 20.
  • the communication-circuit power supply unit 18 generates a DC voltage from a single-phase AC voltage applied between the power line 24 and the power/signal common line 25 and applies this DC voltage to the outdoor communication circuit unit 19.
  • the DC voltage can be generated by a half-wave rectifier circuit or a full-wave rectifier circuit; however, any circuit can be used to generate the DC voltage.
  • the inverter circuit unit 15, controlled by the outdoor control unit 16, converts the applied DC voltage into a given AC voltage at a given frequency.
  • the inverter circuit unit 15 applies the AC voltage obtained by the conversion to the compressor 80 to drive the compressor 80.
  • the inrush-current-prevention-relay drive unit 21 is connected to the power/signal common line 25 via the outdoor S2 terminal 31, the other end of the inrush-current-prevention-relay drive unit 21 is connected to the signal line 26 via the outdoor S3 terminal 32. Thus, power is not supplied to the inrush-current-prevention-relay drive unit 21.
  • the operation before the air conditioner 100 starts its operation will be described.
  • the power is supplied from the three-phase AC power supply 3 to the indoor unit 2 via the power line 24 and the power/signal common line 25, the power is supplied to the indoor control unit 4 and thus the indoor unit 2 is activated.
  • the settings of the indoor operation switching unit 7 are identified. In the example in FIG. 1 , a jumper wire is connected between the terminal c1 and the terminal c2; therefore, it is determined that the air conditioner reduces the standby power during operation standby.
  • the indoor control unit 4 transitions to the state waiting for an input of an operation command from the remote controller 37 via the remote control receiving unit 36.
  • the indoor control unit 4 Upon receiving an operation command signal from the remote controller 37, the indoor control unit 4 turns on the outdoor activation relay 8 to activate the outdoor unit 1. At this point in time, switching is made such that the indoor S3 terminal 35 is disconnected from the indoor communication circuit unit 6 but is connected to the indoor S1 terminal 33. With this control, a single-phase AC voltage is applied between the outdoor S2 terminal 31 and the outdoor S3 terminal 32.
  • the power supplied between the outdoor S2 terminal 31 and the outdoor S3 terminal 32 energizes the inrush-current-prevention-relay drive unit 21 via the power supply switch relay 20 and also causes the contact of the first inrush-current prevention relay 10 to close.
  • the contact of the first inrush-current prevention relay 10 is closed, the AC voltage from the three-phase AC power supply 3 is converted into a DC voltage by the outdoor rectifier unit 9.
  • the DC voltage obtained by the conversion is applied to the smoothing capacitor 14 and the inverter circuit unit 15.
  • the inrush-current prevention resistor 11 is inserted in the power supply path through the first inrush-current prevention relay 10; therefore, inrush current can be prevented.
  • the outdoor control unit 16 is activated by the application of the DC voltage.
  • the outdoor control unit 16 activated closes the contact of the second inrush-current prevention relay 13.
  • the outdoor control unit 16 monitors the voltage to which the smoothing capacitor 14 is charged. After the outdoor control unit 16 determines that the monitoring voltage becomes stable at a set voltage, the outdoor control unit 16 closes the contact of the power supply relay 12. Then, the outdoor control unit 16 opens the contact of the second inrush-current prevention relay 13.
  • the second inrush-current prevention relay 13 is a relay used for increasing the likelihood of self-reset when an instantaneous power failure occurs and for improving user convenience. An instantaneous power failure is a phenomenon that external power supply is temporarily interrupted. The operation of the second inrush-current prevention relay 13 in the case of an instantaneous power failure will be described later.
  • the indoor control unit 4 turns off the outdoor activation relay 8. At this point in time, switching is made such that the indoor S3 terminal 35 is disconnected from the indoor S1 terminal 33 but is connected to the indoor communication circuit unit 6. With this control, a single-phase AC voltage applied between the outdoor S2 terminal 31 and the outdoor S3 terminal 32 is interrupted and thus the inrush-current-prevention-relay drive unit 21 is de-energized. Consequently, the contact of the first inrush-current prevention relay 10 is opened. With this operation, inrush current during an outdoor-unit activation operation can be prevented.
  • the outdoor control unit 16 turns on the power supply switch relay 20 to switch the connection state of the outdoor S2 terminal 31 such that the outdoor S2 terminal 31 is disconnected from the inrush-current-prevention-relay drive unit 21 but is connected to the communication-circuit power supply unit 18.
  • a single-phase AC voltage applied between the outdoor S1 terminal 30 and the outdoor S2 terminal 31 is applied to the communication-circuit power supply unit 18.
  • the communication-circuit power supply unit 18 converts the single-phase AC voltage into a given DC voltage and applies the DC voltage to the outdoor communication circuit unit 19.
  • the first inrush-current prevention relay 10 is turned off after the outdoor activation relay 8 is turned off by the indoor control unit 4; however, this order may be reversed and the power supply switch relay 20 may be first turned on.
  • the power supply switch relay 20 is turned on, the inrush-current-prevention-relay drive unit 21 is de-energized and thus the first inrush-current prevention relay 10 is turned off.
  • the outdoor unit 1 can still be activated.
  • FIG. 2 is a flowchart illustrating an operation of the main parts of the air conditioner 100 according to the embodiment.
  • FIG. 3 is a block diagram illustrating an example configuration of the indoor communication circuit unit 6 in the air conditioner 100 according to the embodiment.
  • FIG. 4 is a block diagram illustrating an example configuration of the outdoor communication circuit unit 19 in the air conditioner 100 according to the embodiment.
  • the indoor communication circuit unit 6 includes a transmitting unit 38, a receiving unit 39, a transmission control unit 50, and a reception control unit 51.
  • the transmitting unit 38 and the receiving unit 39 connected in series are interposed between the power/signal common line 25 and the signal line 26.
  • the outdoor communication circuit unit 19 includes a transmitting unit 40, a receiving unit 41, a transmission control unit 60, and a reception control unit 61.
  • the transmitting unit 40 and the receiving unit 41 connected in series are interposed between the power/signal common line 25 and the signal line 26.
  • the indoor unit 2 is activated. As described above, the indoor unit 2 is activated by supplying power from the three-phase AC power supply 3 to the indoor unit 2.
  • the outdoor activation relay 8 is controlled to be in an on state.
  • the indoor S3 terminal 35 is connected to the indoor S1 terminal 33 and a single-phase AC voltage is applied between the outdoor S2 terminal 31 and the outdoor S3 terminal 32.
  • a single-phase AC voltage is applied between the outdoor S2 terminal 31 and the outdoor S3 terminal 32, the outdoor unit 1 is activated.
  • the outdoor activation relay 8 that has been controlled to be in an on state is returned to an off state. Consequently, switching is made such that the indoor S3 terminal 35 is disconnected from the indoor S1 terminal 33 but is connected to the indoor communication circuit unit 6.
  • step S3 the power supply switch relay 20 is controlled to be in an on state. With this control, switching is made such that the outdoor S2 terminal 31 is disconnected from the inrush-current-prevention-relay drive unit 21 but is connected to the communication-circuit power supply unit 18. Consequently, a single-phase AC voltage is applied to the communication-circuit power supply unit 18.
  • step S4 power is supplied to the communication-circuit power supply unit 18.
  • the communication-circuit power supply unit 18 supplied with power converts the single-phase AC voltage into a given DC voltage and applies the DC voltage obtained by the conversion to the outdoor communication circuit unit 19.
  • step S5 communication is initiated between the outdoor unit 1 and the indoor unit 2.
  • the outdoor unit 1 takes the initiative to the communication at step S5.
  • the outdoor unit 1 serves as a master and the indoor unit 2 serves as a slave. Details of the communication operation performed between the outdoor unit 1 and the indoor unit 2 will be described later.
  • step S6 it is determined whether communication can be established between the outdoor unit 1 and the indoor unit 2.
  • communication can be established (Yes at step S6), the process proceeds to step S7.
  • step S7 steady communication is performed between the outdoor unit 1 and the indoor unit 2. In the steady communication, various pieces of information necessary for the control of the air conditioner 100 are exchanged.
  • the outdoor control unit 16 in the outdoor unit 1 receives an operation start command from the indoor unit 2 and starts a heating operation or a cooling operation.
  • step S9 a process of checking the communication path is performed, which includes processes at steps S10 to S16. As described above, if commercial power is re-applied to the outdoor unit 1 in such a connection state that the outdoor unit 1 can perform communication, unintended overcurrent may flow in the communication path and thus the outdoor-unit circuit may fail. To counter this, the process at step S9 is added.
  • a test signal is transmitted and it is determined whether self-reception is possible.
  • the self-reception indicates a process of receiving a signal generated by the transmitting unit 38 of the indoor unit 2 by the receiving unit 39 of the aforementioned indoor unit 2.
  • the reception process involved in the self-reception can be performed independently of, or asynchronously to, the process at step S5. Details of the reception process involved in the self-reception will be described later.
  • a test signal can be in any form of a communication signal as long as it can check the function of the self-reception.
  • the signal generated by the transmitting unit 38 i.e., a test signal, is in some cases referred to as a "first signal" for the sake of convenience.
  • step S10 When the self-reception of a test signal is successful (Yes at step S10), the process proceeds to step S11.
  • Successful self-reception of a test signal means that the communication path is connected correctly between the indoor unit 2 and the outdoor unit 1 and that the respective functions of the transmitting unit 38 and the receiving unit 39 of the indoor unit 2 are normal. In other words, when the self-reception is successful, it is determined that a communication operation in the indoor unit 2 is normal.
  • the indoor unit 2 waits for receipt of a signal through outdoor transmission.
  • the outdoor transmission indicates an operation of transmitting a signal from the outdoor unit 1 to the indoor unit 2.
  • the indoor unit 2 is in a standby state to determine whether the receiving unit 39 of the indoor unit 2 can receive a signal generated by the transmitting unit 40 of the outdoor unit 1.
  • the signal generated when the outdoor transmission is performed is in some cases referred to as a "second signal" for the sake of convenience.
  • step S12 it is determined again whether communication can be established between the outdoor unit 1 and the indoor unit 2. The determination of whether communication can be established is performed based on the result indicating whether the receiving unit 39 of the indoor unit 2 can receive the signal transmitted from the transmitting unit 40 of the outdoor unit 1.
  • step S12 When communication can be established (Yes at step S12), the process proceeds to step S7.
  • the operations at step S7 and subsequent steps are performed as described above and thus a description thereof is omitted.
  • step S12 when communication cannot be established (No at step S12), the process proceeds to step S13.
  • step S13 it is determined that a communication error has occurred and the process in the flowchart in FIG. 2 ends.
  • step S10 When the self-reception of a test signal in the indoor unit 2 is not successful (No at step S10), the process proceeds to step S14.
  • the self-reception of a test signal is not successful, there is a possibility that the functions of the transmitting unit 40 and the receiving unit 41 of the outdoor unit 1 may not be normal in addition to the possibility that the communication path may not be connected correctly between the outdoor unit 1 and the indoor unit 2 and the functions of the transmitting unit 38 and the receiving unit 39 of the indoor unit 2 are not normal.
  • the outdoor unit 1 is reactivated.
  • the outdoor unit 1 is reactivated by turning on the outdoor activation relay 8.
  • step S15 it is determined whether the number of times the outdoor unit 1 is reactivated is within a predetermined number of times. When the number of times the outdoor unit 1 is reactivated is within the predetermined number of times (Yes at step S15), the process returns to step S2 and the processes at step S2 and subsequent steps are repeated.
  • step S15 when the number of times the outdoor unit 1 is reactivated exceeds the predetermined number of times (No at step S15), the process proceeds to step S16. At step S16, it is determined that a communication error has occurred and the process in the flowchart in FIG. 2 ends.
  • step S10 the process at step S10 is added.
  • this process in a connection state where the outdoor unit 1 can perform communication, commercial power can be prevented from being re-applied to the outdoor unit 1. Consequently, in a state where a communication circuit is formed, an unintended failure of an outdoor-unit circuit can be prevented.
  • step S15 the process at step S15 is added. This process can eliminate the situation where the outdoor unit 1 cannot be reactivated due to an accidental factor; therefore, it is possible to increase the accuracy in determination of an occurrence of a communication error.
  • a communication current supplied from the communication-circuit power supply unit 18 flows between the power/signal common line 25 and the signal line 26.
  • a communication current is current used for communication between the outdoor unit 1 and the indoor unit 2.
  • the outdoor unit 1 and the indoor unit 2 perform communication by detecting a current flowing state and a no-current flowing state.
  • the transmitting unit 38 includes an element for switching a state of a path through which a communication current flows during indoor-outdoor communication to either a communication current flowing state or a no-communication-current flowing state.
  • One example of the element is a photocoupler.
  • a path through which a communication current flows during indoor-outdoor communication is referred to as a "current loop".
  • the current loop is formed by inserting the transmitting unit 38 and the receiving unit 39 of the indoor unit 2 and the transmitting unit 40 and the receiving unit 41 of the outdoor unit 1 in series between the power/signal common line 25 and the signal line 26.
  • a state where a communication current flows in the current loop is referred to as an "ON state” or simply “ON” and a state where a communication current does not flow in the current loop is referred to as an "OFF state” or simply “OFF”.
  • the transmitting unit 38 controls ON/OFF of the current loop in accordance with the control by the transmission control unit 50.
  • the transmitting unit 38 transmits data to the outdoor unit 1 in accordance with ON/OFF control of the current loop.
  • the receiving unit 39 includes an element for receiving data transmitted from the outdoor unit 1.
  • the receiving unit 39 detects whether the value of a communication current flowing in the current loop is larger than or smaller than a current threshold to receive data.
  • One example of the element is a photocoupler.
  • the receiving unit 39 outputs the reception result to the reception control unit 51.
  • the transmission control unit 50 controls ON/OFF of the transmitting unit 38 in accordance with whether the transmission data indicates "0" or "1". When the transmission data indicates "0", the transmitting unit 38 may be controlled to be ON or may be controlled to be OFF. When the transmission data indicates "1", the transmitting unit 38 may be controlled to be ON or may be controlled to be OFF.
  • the reception control unit 51 determines that the reception data indicates “0" or "1" in accordance with the output of the receiving unit 39.
  • the transmitting unit 40 includes an element for switching a state of the current loop between a communication current flowing state and a no-communication-current flowing state.
  • the element is a photocoupler.
  • the transmitting unit 40 controls ON/OFF of the current loop in accordance with the control by the transmission control unit 60.
  • the transmitting unit 40 transmits data to the indoor unit 2 in accordance with ON/OFF control of the current loop.
  • the receiving unit 41 includes an element for receiving data transmitted from the indoor unit 2.
  • the receiving unit 41 detects whether the value of a communication current flowing in the current loop is larger than or smaller than a communication current threshold to receive data.
  • One example of the element is a photocoupler.
  • the receiving unit 41 outputs the output result to the reception control unit 61.
  • the transmission control unit 60 controls ON/OFF of the transmitting unit 40 in accordance with whether the transmission data indicates "0" or "1". When the transmission data indicates "0", the transmitting unit 40 may be controlled to be ON or may be controlled to be OFF. When the transmission data indicates "1", the transmitting unit 40 may be controlled to be ON or may be controlled to be OFF.
  • the reception control unit 61 determines that the reception data indicates "0" or "1" in accordance with the output of the receiving unit 41.
  • the operation flow when data is transmitted from the outdoor unit 1 to the indoor unit 2 will be described below.
  • the transmission control unit 50 of the indoor unit 2 controls the transmitting unit 38 of the indoor unit 2 such that it is ON.
  • Step 1 The transmission control unit 60 of the outdoor unit 1 controls ON/OFF of the transmitting unit 40 of the outdoor unit 1 in accordance with whether the transmission data indicates "0" or "1".
  • Step 2 The receiving unit 39 of the indoor unit 2 outputs the reception result to the reception control unit 51 of the indoor unit 2.
  • Step 3 The reception control unit 51 of the indoor unit 2 determines whether the reception data indicates “0" or "1" in accordance with the input result.
  • the transmission control unit 60 of the outdoor unit 1 controls the transmitting unit 40 of the outdoor unit 1 such that it is ON.
  • Step 1 The transmission control unit 50 of the indoor unit 2 controls ON/OFF of the transmitting unit 38 of the indoor unit 2 in accordance with whether the transmission data indicates "0" or "1".
  • Step 2 The receiving unit 41 of the outdoor unit 1 outputs the reception result to the reception control unit 61 of the outdoor unit 1.
  • Step 3 The reception control unit 61 of the outdoor unit 1 determines whether the reception data indicates "0" or "1" in accordance with the input result.
  • the operation flow when the indoor unit 2 performs the self-reception of a test signal will be described below.
  • the indoor unit 2 performs the self-reception of a test signal at the time when the transmission control unit 60 of the outdoor unit 1 controls the transmitting unit 40 of the outdoor unit 1 such that it is ON.
  • Step 1 The transmission control unit 50 of the indoor unit 2 controls ON/OFF of the transmitting unit 38 of the indoor unit 2 in accordance with whether the transmission data indicates "0" or "1".
  • Step 2 The receiving unit 39 of the indoor unit 2 outputs the reception result to the reception control unit 51 of the indoor unit 2.
  • Step 3 The reception control unit 51 of the indoor unit 2 determines whether the reception data indicates “0" or "1" in accordance with the input result.
  • FIG. 5 is a diagram for explaining an operation in the case of an instantaneous power failure.
  • the second inrush-current prevention relay 13 is a relay used for increasing the likelihood of self-reset when an instantaneous power failure occurs and for improving user convenience.
  • FIG. 5 illustrates, in association with the bus voltage, a sequence operation of the power supply relay 12 on the left side and a sequence operation of the second inrush-current prevention relay 13 on the right side.
  • the "bus voltage” here indicates a voltage of a DC bus that connects the outdoor rectifier unit 9 and the inverter circuit unit 15, and it matches the voltage of the smoothing capacitor 14 in the example in FIG. 1 .
  • the "voltage of the smoothing capacitor 14" is referred to as the "bus voltage”.
  • the bus voltage is monitored by the outdoor control unit 16.
  • the bus voltage drops because some load is connected to the circuit.
  • the contact of the power supply relay 12 is closed while the outdoor unit 1 is energized; therefore, if power supply is immediately restored, the bus voltage instantaneously rises and returns to the voltage obtained by smoothing the power-supply voltage. However, if power supply is not restored, the bus voltage continues to drop.
  • the contact of the power supply relay 12 is opened and then the contact of the second inrush-current prevention relay 13 is closed. Because these operations are performed in sequence, the bus voltage at the time when the contact of the second inrush-current prevention relay 13 is closed may be a voltage Vth1', which is lower than the first voltage threshold Vth1.
  • the outdoor control unit 16 keeps the contact of the second inrush-current prevention relay 13 closed as long as the bus voltage can still cause the outdoor control unit 16 to operate.
  • the voltage of the smoothing capacitor 14 can be restored by using the path through the second inrush-current prevention relay 13 and the inrush-current prevention resistor 11. Because the inrush-current prevention resistor 11 is present in the path, an inrush current value can be limited and thus a failure of a circuit in the subsequent stage, e.g., the outdoor rectifier unit 9, due to excessive inrush current can be prevented.
  • the outdoor control unit 16 determines that the power-supply voltage becomes stable at the stable voltage V DD . Thereafter, the outdoor control unit 16 closes the contact of the power supply relay 12 and then opens the contact of the second inrush-current prevention relay 13. As long as the three-phase AC power supply 3 keeps supplying power, the current for charging the smoothing capacitor 14 is supplied to the smoothing capacitor 14 via the power supply relay 12 without passing through the second inrush-current prevention relay 13. The above control operations can reduce unnecessary power used in the air conditioner 100.
  • FIG. 6 is a block diagram illustrating an example of a hardware configuration in the indoor control unit according to the embodiment.
  • FIG. 7 is a block diagram illustrating another example of a hardware configuration in the indoor control unit according to the embodiment.
  • the indoor control unit 4 can be configured to include a processor 200 for executing computations, a memory 202 storing programs read by the processor 200, and an interface 204 for inputting and outputting signals.
  • the processor 200 may be a computing unit such as an arithmetic unit, a microprocessor, a microcomputer, a central processing unit (CPU), or a digital signal processor (DSP).
  • Examples of the memory 202 include a nonvolatile or volatile semiconductor memory such as a random access memory (RAM), a read only memory (ROM), a flash memory, an erasable programmable read only memory (EPROM), or an electrically erasable programmable read only memory (EEPROM), a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, and a digital versatile disk (DVD).
  • RAM random access memory
  • ROM read only memory
  • EPROM erasable programmable read only memory
  • EEPROM electrically erasable programmable read only memory
  • DVD digital versatile disk
  • the memory 202 stores programs for implementing a function of the indoor control unit 4 and a table referred to by the processor 200.
  • the processor 200 can perform the computation processes described above by exchanging necessary information via the interface 204, executing the programs stored in the memory 202, and referring to the table stored in the memory 202.
  • the computation results by the processor 200 can be stored in the memory 202.
  • the processor 200 and the memory 202 illustrated in FIG. 6 may be replaced by a processing circuit 203 as illustrated in FIG. 7 .
  • the processing circuit 203 is, for example, a single circuit, a combined circuit, an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a combination of them.
  • ASIC application specific integrated circuit
  • FPGA field-programmable gate array

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Air Conditioning Control Device (AREA)

Claims (5)

  1. Klimaanlage (100), die eine Inneneinheit (2) und eine Außeneinheit (1) umfasst und bei der die Inneneinheit (2) eingerichtet ist, die Außeneinheit (1) zu aktivieren, wobei
    die Inneneinheit (2) eingerichtet ist, bei Aktivierung der Außeneinheit (1) zu bestimmen, ob eine Kommunikation zwischen der Inneneinheit (2) und der Außeneinheit (1) hergestellt werden kann, und, wenn die Kommunikation nicht hergestellt werden kann, die Inneneinheit (2) eingerichtet ist, ohne die Außeneinheit (1) zu reaktivieren, einen Selbstempfang des Empfangens eines von der Inneneinheit (2) erzeugten ersten Signals durchzuführen und auf Grundlage eines Ergebnisses des Selbstempfangs zu bestimmen, ob die Außeneinheit (1) reaktiviert werden soll,
    die Inneneinheit (2) und die Außeneinheit (1) miteinander über drei Leitungen, einschließlich einer Energieleitung (24), einer gemeinsamen Energie-/Signalleitung (25) und einer Signalleitung (26), verbunden sind,
    die Inneneinheit (2) und die Außeneinheit (1) jeweils eine Übertragungseinheit (38, 40) und eine Empfangseinheit (39, 41) aufweisen,
    die Übertragungseinheit (38) und die Empfangseinheit (39) der Inneneinheit (2) und die Übertragungseinheit (40) und die Empfangseinheit (41) der Außeneinheit (1) in Reihe zwischen die gemeinsame Energie-/Signalleitung (25) und die Signalleitung (26) geschaltet sind, um eine Stromschleife zu bilden, und
    die Inneneinheit (2) und die Außeneinheit (1) eingerichtet sind, miteinander zu kommunizieren, indem sie einen Kommunikationsstrom erfassen, der in der Stromschleife fließt.
  2. Klimaanlage (100) nach Anspruch 1, wobei, wenn die Inneneinheit (2) in der Lage ist, das erste Signal beim Selbstempfang zu empfangen, die Inneneinheit (2) eingerichtet ist, zu bestimmen, dass ein Kommunikationsbetrieb in der Inneneinheit (2) normal ist.
  3. Klimaanlage (100) nach Anspruch 1, wobei, wenn die Inneneinheit (2) in der Lage ist, das erste Signal beim Selbstempfang zu empfangen, die Inneneinheit (2) eingerichtet ist, auf die Eingabe eines zweiten, von der Außeneinheit (1) erzeugten Signals zu warten, und, wenn die Inneneinheit (2) nicht in der Lage ist, das zweite Signal zu empfangen, die Inneneinheit (2) eingerichtet ist, zu bestimmen, dass ein Kommunikationsfehler auftritt, ohne die Außeneinheit (1) zu reaktivieren.
  4. Klimaanlage (100) nach Anspruch 1, wobei, wenn die Inneneinheit (2) in der Lage ist, das erste Signal beim Selbstempfang zu empfangen, die Inneneinheit (2) eingerichtet ist, auf die Eingabe eines zweiten, von der Außeneinheit (1) erzeugten Signals zu warten, und, wenn die Inneneinheit (2) in der Lage ist, das zweite Signal zu empfangen, die Inneneinheit (2) eingerichtet ist, eine stabile Kommunikation zwischen der Inneneinheit (2) und der Außeneinheit (1) durchzuführen.
  5. Klimaanlage (100) nach Anspruch 1, wobei, wenn die Inneneinheit (2) nicht in der Lage ist, das erste Signal beim Selbstempfang zu empfangen, die Inneneinheit (2) eingerichtet ist, die Außeneinheit (1) zu reaktivieren.
EP17924638.4A 2017-09-08 2017-09-08 Klimaanlage Active EP3680566B1 (de)

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PCT/JP2017/032562 WO2019049330A1 (ja) 2017-09-08 2017-09-08 空気調和機

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CN110030709A (zh) * 2019-04-29 2019-07-19 广东美的制冷设备有限公司 驱动控制电路、空调器、控制方法和计算机可读存储介质
JP6881503B2 (ja) * 2019-05-31 2021-06-02 ダイキン工業株式会社 空調システム
CN112303707B (zh) * 2020-10-15 2023-12-12 青岛海信日立空调系统有限公司 一种空调器和电压控制方法
CN112985869A (zh) * 2021-03-29 2021-06-18 Tcl空调器(中山)有限公司 双设备共用工装测试方法、装置及存储介质
CN114963477A (zh) * 2022-06-07 2022-08-30 海信空调有限公司 室外机及其通信控制方法和空调器

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JP2003056891A (ja) * 2001-08-17 2003-02-26 Chofu Seisakusho Co Ltd 室内機通信装置
JP2006170559A (ja) * 2004-12-17 2006-06-29 Matsushita Electric Ind Co Ltd 通信配線接続機器の通信制御方法、空気調和装置の通信制御方法、及び空気調和装置
JP2007187406A (ja) * 2006-01-16 2007-07-26 Matsushita Electric Ind Co Ltd 空気調和システム
JP5241585B2 (ja) 2009-04-06 2013-07-17 三菱電機株式会社 空気調和機
JP2012117704A (ja) * 2010-11-29 2012-06-21 Mitsubishi Electric Corp 空気調和機
JP5984732B2 (ja) * 2013-04-09 2016-09-06 三菱電機株式会社 空気調和機
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JP6425798B2 (ja) * 2015-04-01 2018-11-21 三菱電機株式会社 通信システムおよび通信装置
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EP3680566A1 (de) 2020-07-15
WO2019049330A1 (ja) 2019-03-14
SG11201912971TA (en) 2020-03-30
JPWO2019049330A1 (ja) 2019-12-19
JP6797311B2 (ja) 2020-12-09
AU2017431039A1 (en) 2020-02-06
AU2017431039B2 (en) 2021-02-04

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