WO2021148949A1 - Carte électrique et appareil de refroidissement dans lequel ladite carte électrique a été installée - Google Patents

Carte électrique et appareil de refroidissement dans lequel ladite carte électrique a été installée Download PDF

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Publication number
WO2021148949A1
WO2021148949A1 PCT/IB2021/050401 IB2021050401W WO2021148949A1 WO 2021148949 A1 WO2021148949 A1 WO 2021148949A1 IB 2021050401 W IB2021050401 W IB 2021050401W WO 2021148949 A1 WO2021148949 A1 WO 2021148949A1
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Prior art keywords
power supply
relay
power
circuit
electric
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PCT/IB2021/050401
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English (en)
Japanese (ja)
Inventor
中下裕子
Original Assignee
ダイキン インダストリーズ （タイランド） リミテッド
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Priority to AU2021209426A priority Critical patent/AU2021209426A1/en
Publication of WO2021148949A1 publication Critical patent/WO2021148949A1/fr

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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
    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices

Definitions

  • the indoor unit whose power supply is cut off controls the opening degree of the electric expansion valve to a predetermined opening degree by the electric power supplied from the outdoor unit via the transmission line.
  • the communication line connected to the outdoor unit is used as an emergency power supply line only for a certain period of time to shut off the power supply.
  • the opening degree of the electric expansion valve of the indoor unit is controlled to a predetermined opening degree.
  • a signal indicating that the power cutoff has occurred is transmitted to the outdoor unit side controller between the time when the power supply cutoff of the indoor unit occurs and the inoperable voltage of the indoor unit side controller is reached.
  • the outdoor unit side controller needs to transmit a signal to the other indoor units during normal operation to suspend communication only for the above-mentioned fixed time.
  • the indoor unit disclosed in Patent Document 1 when a power cutoff occurs in one indoor unit, the indoor unit in which the power supply cutoff does not occur is also affected. Therefore, even if the power to the indoor unit is cut off, there is a problem that it is not necessary to suspend the communication with the indoor unit during normal operation for a certain period of time.
  • the electric board according to the first aspect is an electric board electrically connected to a control board of an indoor unit of a refrigerating apparatus connected to a first power source via a communication line.
  • the electrical board is further connected to the second power source.
  • the electrical board comprises a relay. The relay switches to power supply from the second power supply when power is not supplied from the first power supply to the control board. With this electric board, electric power can be appropriately supplied to the control board of the indoor unit.
  • “The electric board is further connected to the second power source” also includes that the second power source is mounted on the electric board.
  • the electric board according to the second aspect is an electric board according to the first aspect.
  • the refrigerating device includes an indoor unit and an outdoor unit that is electrically connected to the indoor unit.
  • the electric power of the second power source is the electric power supplied from the outdoor unit.
  • the electric board according to the third aspect is the electric board according to the first aspect or the second aspect, and further includes a switching circuit. The switching circuit is switched between a first state that is electrically connected to the second power source and a second state that is not electrically connected. When power is not supplied from the first power supply to the control board, the switching circuit is switched to the first state by the relay.
  • the electric board according to the fourth aspect is the electric board according to the third aspect, and further includes a switch. When the power is not supplied from the first power supply to the control board, the switch turns on or off the energization of the relay to switch the switching circuit to the first state.
  • the electric board according to the fifth aspect is the electric board according to the fourth aspect.
  • the switch is turned on while power is being supplied from the first power source to energize the relay. Further, the switch is turned off when power is not supplied from the first power source to cut off the energization of the relay.
  • a circuit that is simple and has a small number of parts can be realized by a configuration in which a switch is turned on to energize a relay when power is supplied from the first power supply.
  • the electric board according to the sixth viewpoint is an electric board according to any one of the third to fifth viewpoints.
  • the relay has a relay coil and a relay switch.
  • the relay switch switches the switching circuit to the first state when the relay coil is energized on or off. Since this electric board does not require a logic circuit and a general-purpose mechanical relay including a coil and a switch can be used, it is possible to suppress an increase in cost.
  • the electric board according to the seventh aspect is an electric board according to any one of the first to sixth aspects.
  • the electrical board is separated from the control board. In this electric board, since the electric board is separated and independent from the control board, the electric board can be retrofitted. Therefore, it can be mounted on an indoor unit on which the electric board is not mounted.
  • the refrigerating apparatus according to the eighth aspect is a refrigerating apparatus equipped with an electric substrate according to any one of the first to seventh aspects.
  • the refrigerating apparatus is a refrigerating apparatus equipped with an electric substrate according to the eighth aspect.
  • the refrigerating device includes an outdoor unit and a plurality of indoor units connected to the outdoor unit. When the power from the first power supply is not supplied to the control board of any one of the plurality of indoor units, the power supply from the second power supply is switched by the relay.
  • the block diagram of the air conditioner which is the refrigerating apparatus on which the electric board which concerns on one Embodiment of this disclosure is mounted.
  • Circuit diagram of the switching circuit. which shows the transmission path of a positive electrode signal and a negative electrode signal by an arrow when a positive electrode signal is input to a 1st input line and a negative electrode signal is input to a 2nd input line.
  • the polarity correction circuit diagram which shows the transmission path of a positive electrode signal and a negative electrode signal by an arrow when the positive electrode signal is input to the 2nd input line, and the negative electrode signal is input to the 1st input line.
  • the explanatory view which shows the state of the switching circuit when the power supply from a 1st power source is not cut off.
  • the explanatory view which shows the state of the switching circuit when the power supply from a 1st power source is cut off.
  • FIG. 1 is a configuration diagram of an air conditioner 100 which is a refrigerating device on which an electric substrate according to an embodiment of the present disclosure is mounted. Further, FIG. 2 is a block diagram of an electric circuit of the air conditioner 100.
  • the air conditioner 100 is composed of an indoor unit 1 which is a user side unit and an outdoor unit 2 which is a heat source side unit.
  • the indoor unit 1 is installed in each room of the tenant, for example, and each indoor unit 1 is connected to the outdoor unit 2 by a refrigerant connecting pipe.
  • a compressor 15, a four-way switching valve 16, an outdoor heat exchanger 17, an outdoor expansion valve 18 as a pressure reducing mechanism, an indoor expansion valve 20, and an indoor heat exchanger 13 are cyclically connected by a refrigerant pipe. It has a refrigerant circuit 10.
  • the indoor unit 1 includes an indoor control power supply 25, an indoor communication circuit 35, a polarity correction circuit 37, an indoor microprocessor 45, a switching circuit 75, and a second power supply 102.
  • Both the indoor control power supply 25 and the indoor communication circuit 35 are connected to the indoor microcomputer 45.
  • the indoor control power supply 25 receives power from the first power supply 101, which is an AC power supply, via the power supply lines 801, 802, generates a control voltage from the first power supply 101, and supplies the control voltage to the indoor microcomputer 45. There is.
  • the first power supply 101 is a commercial power supply of AC220V.
  • the indoor communication circuit 35 is used when the indoor unit 1 communicates with the outdoor unit 2. In the polarity correction circuit 37, even if the positive electrode signal line and the negative electrode signal line that transmit the signal from the outdoor unit 2 are connected with the wrong polarity, the positive electrode signal is output to the positive electrode output line and the negative electrode signal is output to the negative electrode output line. Can be switched as follows.
  • the indoor microcomputer 45 controls the opening degree of the indoor expansion valve 20, the operating frequency of the indoor fan 14, and the like.
  • a breaker 71 is interposed between the indoor control power supply 25 and the first power supply 101. For example, when the indoor unit 1 of the air conditioner 100 is installed in each of the plurality of tenants, the breaker 71 cuts off the power supply from the first power supply 101 to the indoor unit 1 when the arbitrary tenant is not used. Further, when the power from the first power supply 101 is cut off, the indoor unit 1 detects that the power supply from the first power supply 101 is cut off, and is a power supply different from the first power supply 101.
  • a switching circuit 75 for switching to power supply from the second power supply 102 is mounted.
  • the indoor unit 1 has a first control board 81 and a first electric board 91 different from the first control board 81.
  • the indoor control power supply 25, the indoor communication circuit 35, and the indoor microcomputer 45 are mounted on the first control board 81. Further, the polarity correction circuit 37, the switching circuit 75, and the second power supply 102 are mounted on the first electric board 91.
  • the outdoor unit 2 is equipped with an outdoor control power supply 26, an outdoor communication circuit 36, a polarity correction circuit 38, an outdoor microcomputer 46, and a DC power supply circuit 72. Both the outdoor control power supply 26 and the outdoor communication circuit 36 are connected to the outdoor microcomputer 46.
  • the outdoor control power supply 26 receives power from the three-phase AC power supply 111 via the power supply lines 811, 812, and 813, generates a control voltage from the power supply, and supplies the control voltage to the outdoor microcomputer 46. ..
  • the AC power supply 111 is a commercial power supply of AC380V. Line 814 is a ground wire.
  • the outdoor communication circuit 36 is used when the outdoor unit 2 communicates with the indoor unit 1.
  • the polarity correction circuit 38 outputs the positive electrode signal to the positive electrode output line and the negative electrode signal to the negative electrode output line even if the positive electrode signal line and the negative electrode signal line that transmit the signal from the outdoor communication circuit 36 are connected with the wrong polarity. Can be switched so that
  • the outdoor microcomputer 46 controls the operating frequency of the compressor 15, the switching operation of the four-way switching valve 16, the opening degree of the outdoor expansion valve 18, the operating frequency of the outdoor fan 19, and the like.
  • the outdoor unit 2 has a second control board 82 and a second electric board 92 different from the second control board 82.
  • the outdoor control power supply 26, the outdoor communication circuit 36, and the outdoor microcomputer 46 are mounted on the second control board 82.
  • FIG. 3 is a circuit diagram of the polarity correction circuit 37.
  • the first terminal N1a of the first connector CN1 is connected to the first input line 11.
  • the second terminal N1b of the first connector CN1 is connected to the second input line 12.
  • the communication line of the positive electrode signal F1 is connected to the first terminal N1a, and the communication line of the negative electrode signal F2 is connected to the second terminal N2b.
  • the polarity correction circuit 37 includes a switching relay 30, a first circuit 41, a second circuit 42, a first voltage dividing circuit 51, a second voltage dividing circuit 52, a relay drive circuit 53, and a comparator 55.
  • the function of the polarity correction circuit 37 is to use a switching relay 30 to connect the first input line 11 and the first output line 21 when the first input line 11 is a positive electrode, and to connect the second input line 12 and the second output line.
  • the switching relay 30 has a relay coil 31 and a contact switching mechanism 32.
  • the contact switching mechanism 32 can close the first contact C1a and the second contact C2a while the relay coil 31 is energized, and at the same time open the third contact C1b and the fourth contact C2b.
  • the contact switching mechanism 32 can open the first contact C1a and the second contact C2a while the relay coil 31 is not energized, and at the same time close the third contact C1b and the fourth contact C2b.
  • the first circuit 41 connects the first input line 11 and the first output line 21, and connects the second input line 12 and the second output line 22.
  • the first contact C1a of the switching relay 30 is provided in the middle of the wiring connecting the first input line 11 and the first output line 21.
  • the first input line 11 and the first output line 21 are connected when the first contact C1a is closed, and the connection between the first input line 11 and the first output line 21 is released when the first contact C1a is open. Will be done.
  • a second contact C2a of the switching relay 30 is provided in the middle of the wiring connecting the second input line 12 and the second output line 22.
  • the second input line 12 and the second output line 22 are connected when the second contact C2a is closed, and the connection between the second input line 12 and the second output line 22 is released when the second contact C2a is open. Will be done. (2-1-3) Second circuit 42
  • the second circuit 42 connects the first input line 11 and the second output line 22, and connects the second input line 12 and the first output line 21.
  • the second circuit 42 is provided with a third contact C1b of the switching relay 30 in the middle of the wiring connecting the first input line 11 and the second output line 22.
  • the first input line 11 and the second output line 22 are connected when the third contact C1b is closed, and the connection between the first input line 11 and the second output line 22 is released when the third contact C1b is open. Will be done.
  • a fourth contact C2b of the switching relay 30 is provided in the middle of the wiring connecting the second input line 12 and the first output line 21.
  • the second input line 12 and the first output line 21 are connected when the fourth contact C2b is closed, and the connection between the second input line 12 and the first output line 21 is released when the fourth contact C2b is open. Will be done.
  • (2-1-4) First voltage divider circuit 51
  • the first diode D11, the first resistor R11, and the second resistor R12 are connected in series from the connection point S11 with the first input line 11 to the connection point S12 with the second input line 12. It is connected. Since the anode of the first diode D11 is connected to the connection point S11 and the cathode is connected to one end of the first resistor R11, the direction from the connection point S11 to the connection point S12 is the forward direction of the first diode D11.
  • Second voltage divider circuit 52 In the second voltage dividing circuit 52, the second diode D21, the third resistor R21, and the fourth resistor R22 are connected in series from the connection point S21 with the second input line 12 to the connection point S22 with the first input line 11. It is connected.
  • the direction from the connection point S21 to the connection point S22 is the forward direction of the second diode D21. Therefore, when the second input line 12 is the positive electrode and the first input line 11 is the negative electrode, the third resistor R21 is placed at both ends of the third resistor R21 and the fourth resistor R22 from the connection point S21 toward the connection point S22. And a voltage drop occurs according to the resistance value ratio of the fourth resistor R22.
  • the connection point Q22 between the third resistor R21 and the fourth resistor R22 is connected to the non-inverting input terminal of the comparator 55, which will be described later.
  • the relay drive circuit 53 includes a transistor Tra. In the transistor Tra, while a predetermined positive voltage is applied to the base, the collector and the emitter conduct with each other, and the drive voltage E1 is applied to the relay coil 31. While the drive voltage E1 is applied to the relay coil 31, the relay coil 31 is energized, so that the first contact C1a and the second contact C2a provided in the first circuit 41 are closed, and at the same time, the second circuit 42 The third contact C1b and the fourth contact C2b provided in the above are open.
  • Comparator 55 compares the voltage input to the inverting input terminal (hereinafter referred to as the first voltage V1) with the voltage input to the non-inverting input terminal (hereinafter referred to as the second voltage V2) to obtain a second voltage.
  • the drive voltage E1 is applied to the relay coil 31.
  • the connection point Q12 between the first resistor R11 and the second resistor R12 is connected to the inverting input terminal of the comparator 55, and the inverting input terminal is connected to the ground GND via the fifth resistor R15.
  • the first voltage V1 is the potential difference between the connection point Q12 between the first resistor R11 and the second resistor R12 and the ground GND. Further, since the connection point Q22 between the third resistor R21 and the fourth resistor R22 is connected to the non-inverting input terminal of the comparator 55, the non-inverting input terminal is connected to the ground GND via the sixth resistor R26.
  • the second voltage V2 is the potential difference between the connection point Q22 between the third resistor R21 and the fourth resistor R22 and the ground GND.
  • the switching circuit 75 includes an on / off relay 76, a first switching circuit 77a, a second switching circuit 77b, a third switching circuit 77c, a photocoupler 78, and a relay drive circuit 79.
  • the function of the switching circuit 75 is to detect the presence or absence of power supply from the first power supply 101 using the photocoupler 78, and to use the on / off relay 76 when there is no power supply from the first power supply 101. It is to supply electric power to the first control board 81 from the second electric power source 102 which is another electric power source.
  • On / off relay 76 In this embodiment, the switching circuit 75 has two on / off relays 76. The number of on / off relays 76 can be set arbitrarily.
  • the on / off relay 76 has a relay coil 76a and a relay switch 76b.
  • the relay switch 76b can close the first contact S1a and the second contact S2a while the relay coil 76a is energized, and at the same time open the third contact S1b and the fourth contact S2b. Further, the relay switch 76b can open the first contact S1a and the second contact S2a and at the same time close the third contact S1b and the fourth contact S2b while the relay coil 76a is not energized.
  • (2-2-2) First switching circuit 77a The first switching circuit 77a conducts conduction between the first DC power supply Ea and the first terminal N3a of the third connector CN3 only when the third contact S1b of the on / off relay 76 is closed, and connects to the first control board 81. Power is supplied from the first DC power source Ea.
  • Second switching circuit 77b The second switching circuit 77b conducts the second DC power supply Eb and the second terminal N3b of the third connector CN3 only when the fourth contact S2b of the on / off relay 76 is closed, and connects to the first control board 81. The power of the second DC power source Eb is supplied.
  • the third switching circuit 77c conducts conduction between the third DC power supply Ec and the third terminal N3c of the third connector CN3 only when the third contact S1b of the on / off relay 76 is closed, and connects to the first control board 81.
  • the power of the third DC power source Ec is supplied.
  • Photocoupler 78 As shown in FIG. 4, the photocoupler 78 is an insulating switch including a photodiode 78a and a phototransistor 78b.
  • the first terminal N5a of the connector CN5 is connected to the anode of the photodiode 78a of the photocoupler 78.
  • the second terminal N5b of the connector CN5 is connected to the cathode of the photodiode 78a of the photocoupler 78.
  • the branch wire of the power supply line 801 is connected to the first terminal N5a, and the branch wire of the power supply line 802 is connected to the second terminal N5b.
  • a rectifier circuit 73 is connected in parallel to both ends of the photodiode 78a. The rectifier circuit 73 rectifies the AC voltage of the first power supply 101 with the diode Da and the smoothing capacitor Ca, and generates a DC voltage suitable for causing the photodiode 78a to emit light by the voltage dividing resistors Ra and Rb. (2-2-6) Relay drive circuit 79 As shown in FIG.
  • the relay drive circuit 79 includes a transistor Trb.
  • the transistor Trb While a predetermined positive voltage is applied to the base, the collector and the emitter conduct with each other, and the voltage of the drive power supply Ed is applied to the relay coil 76a. While the voltage of the drive power supply Ed is applied to the relay coil 76a, the relay coil 76a is energized, so that the third contact S1b provided in the first switching circuit 77a and the third switching circuit 77c and the second switching The fourth contact S2b provided in the circuit 77b is opened. Therefore, the power of the first DC power supply Ea, the second DC power supply Eb, and the third DC power supply Ec is not supplied to the first control board 81.
  • Second power supply 102 As shown in FIG. 2, the second power supply 102 introduces the DC voltage generated by the DC power supply circuit 72 of the outdoor unit 2 via the communication lines L1 and L2, and introduces the first DC power supply Ea of the first control board 81.
  • the voltage required for each of the second DC power supply Eb and the third DC power supply Ec is provided.
  • the second power supply 102 and the first control board 81 are cut off by the switching circuit 75 while the power is supplied to the first control board 81 from the first power supply 101, and the power is supplied from the first power supply 101.
  • the switching circuit 75 connects the two.
  • the advantage of this is that in the indoor unit 1, after the power supply from the first power supply 101 is cut off, the opening degree of the indoor expansion valve 20 which is an electric expansion valve is based on the operation mode before the power supply is cut off. To be adjusted. For example, in the case of cooling operation, the opening degree of the indoor expansion valve is closed, and in the case of heating operation, it is slightly opened.
  • Second electric board 92 As shown in FIG. 2, the polarity correction circuit 38 and the DC power supply circuit 72 are mounted on the second electric board 92.
  • the second electric board 92 of the outdoor unit 2 is a board separate from the second control board 82, but may be integrated into one board.
  • (3-1) Polarity correction circuit 38 The polarity correction circuit 38 outputs the positive electrode signal to the positive electrode output line and the negative electrode signal to the negative electrode output line even if the positive electrode signal line and the negative electrode signal line that transmit the signal from the outdoor communication circuit 36 are connected with the wrong polarity. It is a circuit that switches so as to be performed.
  • the DC power supply circuit 72 is a circuit that generates a DC voltage to be supplied to the second power supply 102 mounted on the first electric board 91 of the indoor unit 1.
  • the DC power supply circuit 72 introduces an AC voltage from one of the power supply lines 811, 812, and 813 of the three-phase AC power supply 111, and generates a DC voltage via the filter circuit 72a, the rectifying circuit 72b, and the smoothing capacitor 72c. As shown in FIG.
  • the DC voltage generated by the DC power supply circuit 72 is transmitted from the outdoor communication circuit 36 in a state of being superimposed on the positive electrode signal F1 and the negative electrode signal F2.
  • the positive electrode signal F1 is transmitted to the indoor unit 1 via the communication line L1
  • the negative electrode signal F2 is transmitted to the indoor unit 1 via the communication line L2.
  • FIG. 5 shows the polarities of the transmission paths of the positive electrode signal F1 and the negative electrode signal F2 when the positive electrode signal F1 is input to the first input line 11 and the negative electrode signal F2 is input to the second input line 12. It is a correction circuit diagram.
  • the first resistor R11 and the second resistor R12 are first located at both ends of the first resistor R11 and the second resistor R12 from the connection point S11 toward the connection point S12. A voltage drop occurs according to the resistance value ratio of the resistor R11 and the second resistor R12. Further, a positive voltage is also applied to the connection point S22 of the second voltage dividing circuit 52, but since the direction is opposite to the forward direction of the second diode D21, no voltage drop occurs in the third resistor R21 and the fourth resistor.
  • a voltage drop occurs at both ends of each of the R22 and the sixth resistor R26 according to the resistance value ratio of the fourth resistor R22 and the sixth resistor R26.
  • the potential difference (V2) between the connection point Q22 of the second voltage dividing circuit 52 and the ground GND becomes larger than the potential difference (V1) between the connection point Q12 of the first voltage dividing circuit 51 and the ground GND in advance.
  • the resistance values of the first resistor R11, the second resistor R12, the third resistor R21, the fourth resistor R22, and the sixth resistor R26 are set.
  • V2 (V2> V1) is input to the non-inverting input terminal of the comparator 55 and V1 is input to the inverting input terminal
  • a predetermined output voltage Vout E2 is output from the output terminal of the comparator 55.
  • This output voltage Vout is applied to the base of the transistor Tra of the relay drive circuit 53, and the collector and the emitter conduct with each other to energize the relay coil 31, so that the first contact C1a and the first contact C1a provided in the first circuit 41 are energized.
  • the two contacts C2a are closed, and at the same time, the third contact C1b and the fourth contact C2b provided in the second circuit 42 are opened.
  • FIG. 6 shows the polarities of the transmission paths of the positive electrode signal F1 and the negative electrode signal F2 when the positive electrode signal F1 is input to the second input line 12 and the negative electrode signal F2 is input to the first input line 11. It is a correction circuit diagram.
  • a third resistor R21 and a third resistor R22 are placed at both ends of the third resistor R21 and the fourth resistor R22 from the connection point S21 toward the connection point S22.
  • a voltage drop occurs according to the resistance value ratio of the resistor R21 and the fourth resistor R22.
  • a positive voltage is also applied to the connection point S12 of the first voltage dividing circuit 51, but since the direction is opposite to the forward direction of the first diode D11, no voltage drop occurs in the first resistor R11 and the second resistor.
  • a voltage drop occurs at both ends of each of the R12 and the fifth resistor R15 according to the resistance value ratio of the second resistor R12 and the fifth resistor R15.
  • the potential difference (V1) between the connection point Q12 of the first voltage dividing circuit 51 and the ground GND becomes larger than the potential difference (V2) between the connection point Q22 of the second voltage dividing circuit 52 and the ground GND in advance.
  • the first contact C1a and the second contact C2a provided in the first circuit 41 are opened, and at the same time, the third contact C1b and the fourth contact C2b provided in the second circuit 42 are closed.
  • the first input line 11 is the negative electrode
  • the first input line 11 and the second output line 22 are connected, and the second input line 12 and the first output line 21 are connected.
  • the polarity correction circuit 37 always outputs the positive electrode signal F1 from the first output line 21, and the negative electrode signal F2 is always output from the second output line 22.
  • FIG. 7 is an explanatory diagram showing a state of the switching circuit 75 when the power supply from the first power supply 101 is not cut off. .. In FIG.
  • the current flow is indicated by an arrow.
  • a DC voltage obtained by rectifying the AC voltage of the first power supply 101 is applied in the forward direction to both ends of the photodiode 78a of the photocoupler 78, and the photodiode 78a emits light when the current If flows.
  • the phototransistor 78b receives light from the photodiode 78a and conducts between the collector and the emitter, and a current Iout flows through the phototransistor 78b.
  • a potential difference between the emitter and the ground GND is generated by the resistor Rc between the emitter and the ground GND, which is applied as the base voltage of the transistor Trb of the relay drive circuit 79, and the base current Ib flows.
  • FIG. 8 is an explanatory diagram showing a state of the switching circuit 75 when the power supply from the first power supply 101 is cut off.
  • the current flow is indicated by an arrow.
  • the phototransistor 78b since no DC voltage is applied to both ends of the photodiode 78a of the photocoupler 78, no light is emitted. Therefore, since the phototransistor 78b does not receive the light emission of the photodiode 78a, the collector and the emitter do not conduct with each other. As a result, there is no potential difference between the emitter and the ground GND. Since the base voltage is not applied to the transistor Trb, the collector and the emitter do not conduct with each other, and the relay coil 76a is not energized.
  • the first electric board 91 is an electric board that is electrically connected to the first control board 81 via a communication line.
  • the first control board 81 is a control board of the indoor unit 1 of the air conditioner 100 connected to the first power supply 101.
  • the first electric board 91 is further connected to the second power supply 102.
  • the first electric board 91 includes an on / off relay 76.
  • the on / off relay 76 switches to power supply from the second power supply 102 when power is not supplied from the first power supply 101 to the first control board 81.
  • the first electric board 91 can appropriately supply electric power to the first control board 81 of the indoor unit 1.
  • the first electric board 91 is further connected to the second power supply 102” includes that the second power supply 102 is mounted on the first electric board 91.
  • the air conditioner 100 includes an indoor unit 1 and an outdoor unit 2 electrically connected to the indoor unit 1.
  • the electric power of the second power source 102 is the electric power supplied from the outdoor unit 2.
  • the first electric board 91 further includes a switching circuit 75.
  • the switching circuit 75 is switched to either a first state that is electrically connected to the second power supply 102 or a second state that is not electrically connected.
  • the on / off relay 76 switches the switching circuit 75 to the first state.
  • the first electric board 91 further includes a photocoupler 78 as a switch. When power is not supplied from the first power supply 101 to the first control board 81, the photocoupler 78 turns on or off the energization of the on / off relay 76 to switch the switching circuit 75 to the first state.
  • the photocoupler 78 Since the photocoupler 78 energizes and de-energizes the on / off relay 76 according to the presence or absence of power supply from the first power supply 101, the configuration can be simplified and the cost can be reduced. (6-5) The photocoupler 78 is turned on while power is being supplied from the first power supply 101 to energize the on / off relay 76. Further, the photocoupler 78 is turned off when power is not supplied from the first power supply 101 to cut off the energization of the on / off relay 76. A simple circuit with a small number of parts can be realized by a configuration in which the photocoupler 78 is turned on to energize the relay when power is supplied from the first power supply 101.
  • the on / off relay 76 has a relay coil 76a and a relay switch 76b.
  • the relay switch 76b switches the switching circuit 75 to the first state when the energization of the relay coil 76a is on or off. Since this electric board does not require a logic circuit and a general-purpose mechanical relay including a relay coil and a relay switch can be used, it is possible to suppress an increase in cost. (6-7)
  • the first electric board 91 since the first electric board 91 is separated from the first control board 81, the first electric board 91 can be retrofitted. Therefore, it can be mounted on the indoor unit 1 on which the first electric board 91 is not mounted.
  • the air conditioner 100 equipped with the first electric board 91 includes an outdoor unit 2 and a plurality of indoor units 1 connected to the outdoor unit 2.
  • the power supply is switched from the second power supply 102 by the on / off relay 76. Be done.

Abstract

La présente invention aborde le problème de l'élimination du besoin d'interrompre une communication à une unité intérieure fonctionnant normalement pendant une certaine durée, même si l'alimentation de l'unité intérieure est interrompue.　Une première carte électrique (91) est électriquement connectée à une première carte de commande (81) par l'intermédiaire d'une ligne de communication. La première carte de commande (81) est une carte de commande destinée à une unité intérieure (1) d'un climatiseur (100) connecté à une première source d'alimentation (101). La première carte électrique (91) est en outre connectée à une seconde source d'alimentation (102). La première carte électrique (91) comprend un relais marche-arrêt (76). Le relais marche-arrêt (76) bascule sur l'alimentation fournie par la seconde source d'alimentation (102) lorsque l'alimentation n'est pas fournie par la première source d'alimentation (101) à la première carte de commande (81). Par conséquent, la première carte électrique (91) peut alimenter correctement la première carte de commande (81) de l'unité intérieure (1).
PCT/IB2021/050401 2020-01-20 2021-01-20 Carte électrique et appareil de refroidissement dans lequel ladite carte électrique a été installée WO2021148949A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2021209426A AU2021209426A1 (en) 2020-01-20 2021-01-20 Electrical board and cooling apparatus in which said electrical board has been installed

Applications Claiming Priority (2)

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JP2020-006745 2020-01-20
JP2020006745A JP2021113643A (ja) 2020-01-20 2020-01-20 電気基板、およびその電気基板を搭載した冷凍装置

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WO2021148949A1 true WO2021148949A1 (fr) 2021-07-29

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JP (1) JP2021113643A (fr)
AU (1) AU2021209426A1 (fr)
WO (1) WO2021148949A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004286238A (ja) * 2003-03-19 2004-10-14 Daikin Ind Ltd 冷却装置の制御回路及び冷却装置の制御方法
JP2008057868A (ja) * 2006-08-31 2008-03-13 Daikin Ind Ltd 空気調和機
JP2014196885A (ja) * 2013-03-29 2014-10-16 パナソニック株式会社 空気調和システム
JP2016220398A (ja) * 2015-05-20 2016-12-22 シャープ株式会社 電気機器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004286238A (ja) * 2003-03-19 2004-10-14 Daikin Ind Ltd 冷却装置の制御回路及び冷却装置の制御方法
JP2008057868A (ja) * 2006-08-31 2008-03-13 Daikin Ind Ltd 空気調和機
JP2014196885A (ja) * 2013-03-29 2014-10-16 パナソニック株式会社 空気調和システム
JP2016220398A (ja) * 2015-05-20 2016-12-22 シャープ株式会社 電気機器

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