JP2010054065A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To positively reduce electric power consumption of an outdoor unit in a standby state of air conditioning operation, and to attain miniaturization and reduction of costs and weight of the outdoor unit. <P>SOLUTION: During transition to the standby state, an outdoor unit control part 9 controls an opening and closing means MR to cut off power supply to an inverter 18, and an indoor unit control part 8 controls a first switching relay 46 to supply driving electric power to a third switching relay 45. The third switching relay 45 is switched so as to cut off power supply to a switching power source 37, and the outdoor unit control part 9 is stopped. At the time release of the standby state, the indoor unit control part 8 controls the first switching relay 46 to cut off the driving electric power being supplied to the third switching relay 45. By this, the third switching relay 45 is switched so as to supply electric power to the switching power source 37, and the outdoor unit control part 9 is started. The outdoor unit control part 9 controls the opening and closing means MR to start power supply to the inverter 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an air conditioner, and more particularly to an air conditioner that reduces power consumption of an outdoor unit in a standby state.

  Conventionally, an air conditioner is connected to each other by a total of three communication wires: a pair of power connection wires that connect an indoor unit and an outdoor unit and one signal transmission connection wire that connects the indoor unit and the outdoor unit. In addition, for example, it is known that a commercial power supply wire is connected to an outdoor unit, and the power connection wiring and the power supply wire are connected in the outdoor unit (conventional example 1). In such an air conditioner, if it is intended to reduce the power consumption of the outdoor unit during standby operation in consideration of energy saving, an open / close relay is provided on the power line of the outdoor unit, and this open / close relay is opened during standby operation. It is necessary to.

  When the opening / closing control of the open / close relay is performed by the control unit provided in the outdoor unit, there is a problem that it cannot be restarted when the open / close relay is opened and the outdoor unit control unit stops. In addition, when performing opening / closing control of this open / close relay with the control unit provided in the indoor unit, it is necessary to additionally install dedicated communication wiring between the indoor unit and the outdoor unit. Since the terminal portion and the internal circuit are changed, there is a problem that the cost of the entire apparatus increases.

  Therefore, as shown in Patent Document 1, as an air conditioner for reducing energy consumption during standby operation by cutting off the power supply of the outdoor unit in order to save energy, as shown in Patent Document 1, The installed outdoor unit is connected to each other by a pair of power connection wiring and one signal transmission connection wiring. Also, the commercial power is connected to the outdoor unit, and the drive power from the indoor unit is connected to the power line on the outdoor unit side. A switch provided with an open / close relay that is supplied and closed has been proposed (conventional example 2).

  As shown in the circuit block diagram of FIG. 6, the air conditioner disclosed in Patent Document 1 includes an indoor unit terminal 103 of the indoor unit 101 and an outdoor unit terminal 104 of the outdoor unit 102, which are paired with a power supply communication line La1. , La2 and one signal transmission connection line Lcs are connected to each other by a connection line made up of three wires. On the outdoor unit 102 side, the main power supply unit 115 is connected to the power supply wire connection terminal 105 via the power supply wire Lac, and the power supply wire connection terminal 105 and the outdoor unit terminal 104 are connected inside the outdoor unit 102. .

  The indoor unit 101 is provided with an indoor unit control board 107 on which an indoor unit control unit 106 is mounted. The indoor unit control board 107 is connected to a blower fan motor 108 to which a blower fan is connected, and a wind direction plate stepping motor 109 for swinging up and down or left and right wind direction plates, and detects the room temperature. Various sensors 110 such as a room temperature sensor 110a and refrigerant temperature sensors 110b and 110c for detecting the refrigerant temperature flowing through the indoor heat exchanger are connected.

  The indoor unit control unit 106, the blower fan motor 108, the wind direction plate stepping motor 109, and various sensors 110 are connected to the indoor side power supply lines Li1 and Li2 whose one ends are connected to the power supply wirings La1 and La2, as necessary. It is connected via a constant voltage DC power supply. As a result, the operating power of each device is supplied via the indoor side power supply lines Li1 and Li2, and during the air conditioning operation, the indoor unit control unit 106 monitors the detection signals from the various sensors 110, and the blower fan motor 108 and the wind direction. The operation of the plate stepping motor 109 is controlled.

  The indoor unit control board 107 is further provided with an indoor signal transmission circuit 111 and an indoor signal reception circuit 112 that communicate with the outdoor unit 102, and are connected in series to the indoor power supply lines Li1 and Li2. It is connected to the. Further, a connection point between the indoor signal transmission circuit 111 and the indoor signal reception circuit 112 is connected to the signal transmission connection line Lcs via the indoor transmission line Lis.

  Further, the indoor unit control board 107 is provided with a remote control receiving unit 113, which receives a setting signal when the user performs various setting operations such as start / stop of air conditioning operation by the remote control 114. Is sent to the indoor unit control unit 106 to perform control according to the new setting.

  On the other hand, the outdoor unit 102 is provided with an outdoor unit control board 117 on which the outdoor unit control unit 116 is mounted. The compressor 118, the four-way valve 119, the electric expansion valve 120, the electromagnetic valve 121, and the outdoor fan are connected to the outdoor power supply lines Lo1 and Lo2 whose one ends are connected to the power supply wiring lines La1 and La2 via the outdoor unit terminal 104. The connected outdoor fan motors 122 are connected to each other via the outdoor unit control board 117. Various sensors such as an outside air temperature sensor that detects an outside air temperature (not shown) and a refrigerant temperature sensor that detects the temperature of the refrigerant flowing through the outdoor heat exchanger are also connected via the outdoor unit control board 117.

  The outdoor unit control unit 116, the four-way valve 119, the electric expansion valve 120, the electromagnetic valve 121, and the outdoor fan motor 122 are connected to the outdoor power supply lines Lo1 and Lo2 through a constant voltage DC power supply or the like as necessary. Yes. The compressor 118 is connected to the outdoor power supply lines Lo1 and Lo2 via the rectifier 123 and the inverter 124. During the air conditioning operation, the outdoor unit control unit 116 monitors detection signals from various sensors and controls the operations of the four-way valve 119, the electric expansion valve 120, the electromagnetic valve 121, the outdoor fan motor 122, and the compressor 118.

  The outdoor unit control board 117 is further provided with an outdoor signal transmission circuit 125 and an outdoor signal reception circuit 126 that communicate with the indoor unit 101, and are connected in series to the outdoor power supply lines Lo1 and Lo2. It is connected to the. The connection point between the outdoor signal transmission circuit 125 and the outdoor signal reception circuit 126 is connected to the signal transmission connection line Lcs via the outdoor transmission line Los.

  FIG. 7 is a principal circuit block diagram showing connections between the indoor signal transmission circuit 111 and the indoor signal reception circuit 112 described above, and the outdoor signal transmission circuit 125 and the outdoor signal reception circuit 126 described above. The indoor signal transmission circuit 111 and the outdoor signal transmission circuit 125 are each configured by a series circuit of a phototriac Ta and a resistor R1, and the indoor signal reception circuit 112 and the outdoor signal reception circuit 126 are connected in antiparallel to each other. A pair of light emitting diodes Do, Do and a resistor R2 connected in series to the light emitting diodes Do, Do.

  In the following description, the indoor side power supply line Li1 and the outdoor side power supply line Lo1 and the power connection wiring La1 that connects them to each other are collectively referred to as a reference side power supply line L1, and similarly, the indoor side power supply line Li2 and the outdoor side power supply line The line Lo2 and the power communication line La2 that connects them to each other together, the voltage side power supply line L2, the indoor side transmission line Lis, the outdoor transmission line Los, and the signal transmission connection line Lcs that connects them together to communicate with each other. This will be described as Ls.

  Communication between the indoor unit 101 and the outdoor unit 102 is performed as follows. For example, in the signal transmission from the indoor unit control unit 106 to the outdoor unit control unit 116, a light emitting element (not shown) arranged facing the phototriac Ta on the indoor unit 101 side emits light according to the energization control of the indoor unit control unit 106. Each time, the phototriac Ta is turned on, and a current flows through the diode Do. At this time, the voltage between the communication line Ls and the reference-side power supply line L1 rises. As a result, a current also flows through the light emitting diode Do on the outdoor unit 102 side to emit light. This light emission state is detected by a light receiving element (not shown), and the detection signal is taken into the outdoor unit control unit 116, and transmission is completed. Signal transmission from the outdoor unit control unit 116 to the indoor unit control unit 106 is similarly performed.

  The outdoor power supply lines Lo1 and Lo2 in the outdoor unit 102 are equipment power lines Leq to which various sensors, a four-way valve 119, an electric expansion valve 120, etc. (hereinafter referred to as outdoor unit load 127) are connected. The outdoor unit control unit power supply line 128 is connected to the outdoor unit control unit power line Lmc. The first power supply line Leq is branched into the first relay MR1 and the outdoor unit control unit power supply line Lmc is connected to the outdoor unit control unit power supply line Lmc. A second relay MR2 is interposed.

When the AC power is input through the outdoor unit control unit power line Lmc, the outdoor unit control unit power supply 128 converts the AC power into a predetermined DC power and supplies it to the outdoor unit control unit 116. Opening and closing of the first relay MR1 is controlled by the outdoor unit control unit 116. Further, when the second relay MR2 is closed, the outdoor unit control unit 116 performs control for opening the second relay MR2 by stopping energization to the drive coil MR2C of the second relay.
The drive coil MR2C of the second relay is closed by electric power supplied from a relay driving power source 129 connected to the outdoor power supply line Lo1 and the outdoor transmission line Los.

  In the configuration described above, switching from the operating state of the air conditioner air conditioning operation to the standby state is as follows. When the user operates the remote controller 114 to stop the operation, the indoor unit control unit 106 transmits a stop signal to the outdoor unit control unit 116 through the communication line Ls. At this time, the indoor unit control unit 106 also stops supplying power to the various sensors 110, the blower fan motor 108, etc., and shifts to a standby state in which only the indoor unit control unit 106 and the remote control receiving unit 113 are maintained. .

  Receiving the stop signal from the indoor unit control unit 106, the outdoor unit control unit 116 first opens the first relay MR1 and stops the power supply to the outdoor unit load 127. Thereafter, the outdoor unit control unit 116 stops energizing the drive coil MR2C of the second relay MR2, and the second relay MR2 is opened. As a result, the power input to the outdoor unit control unit power supply 128 is cut off, and the outdoor unit 102 enters a standby state in which the power supply to all devices is stopped.

  On the other hand, switching from the standby state of the air conditioning operation to the operation state is as follows. When the user operates the remote controller 114 to start operation, the indoor unit control unit 106 transmits an activation signal to the outdoor unit control unit 116 through the communication line Ls. This activation signal is transmitted by turning on the phototriac Ta of the indoor signal transmission circuit 111 for a predetermined time. As a result, the voltage of the communication line Ls with respect to the reference-side power supply line L1 rises, and accordingly, an AC voltage is output from the relay drive power supply 129, thereby energizing the drive coil MR2C.

  As a result, the second relay MR2 that was open in the standby state is closed, and the power supply voltage is input to the outdoor unit control unit power supply 128 through the outdoor unit control unit power line Lmc, so that the outdoor unit control unit power supply 128 is supplied. Is supplied to the outdoor unit control unit 116. First, the outdoor unit control unit 116 activated thereby performs control for maintaining the energized state of the drive coil MR2C in order to maintain the closed state of the second relay MR2. Thereby, even after the activation signal from the indoor unit control unit 106 stops, the operation state of the outdoor unit control unit 116 is continued.

  Thereafter, a signal necessary for the air conditioning operation is received by communicating with the indoor unit control unit 106, the first relay MR1 is closed, power is supplied to the outdoor unit load 127, and the air conditioning operation is performed. At the same time, the indoor unit control unit 106 also synchronizes with the activation of the outdoor unit load 127 of the outdoor unit 102 according to the communication content with the outdoor unit control unit 116, and various sensors 110 of the indoor unit 101, the blower fan motor 108, etc. Start drive control.

  As described above, in the embodiment disclosed in Patent Document 1, the second relay MR2 is opened by the outdoor unit controller 116 at the time of transition to the standby state, and the operating power is supplied to the outdoor unit controller 116. Is cut off. When the standby state is released, the communication line Ls is used to supply the exciting power of the drive coil MR2C from the indoor unit 101 to the outdoor unit 102 through this, and the second relay MR2 is closed to activate the outdoor unit control unit 116. . Therefore, in the standby state, the power supply to the outdoor unit 102 is cut off, so that power consumption can be reduced.

  However, in the above-described method, since the outdoor unit control unit 116 opens the second relay MR2 during the transition to the standby state and shuts off the supply of operating power to the outdoor unit control unit 116, for example, outdoor noise due to noise or the like When the outdoor control unit 116 is in an uncontrollable state (runaway state), the control for opening the second relay MR2 cannot be performed, and the outdoor unit control unit 116 cannot be stopped when the standby state shifts. It was.

In addition, a control line for the outdoor unit control unit 116 to control opening and closing of the second relay MR2 is connected from the outdoor unit control unit 116 to the second relay MR2 (drive coil MR2C). Therefore, it is necessary to perform wiring so as to connect from the rear stage (secondary side) to the front stage (primary side) of the constant voltage DC power source that converts the power source voltage into operating power corresponding to each device. Since the voltage on the primary side is different from that on the secondary side, when the pattern from the secondary side is wired to the primary side, the primary side pattern and the secondary side pattern must satisfy the standards such as IEC603335-1 and UL840. It is necessary to take a large distance. For this reason, there has been a problem that the area of the substrate is increased, which hinders downsizing and weight reduction of the outdoor unit 102 and increases the cost.
Japanese Patent No. 3019844 (pages 4-6, FIGS. 1 and 3)

  The present invention solves the above-described problems, and reliably shuts down the outdoor unit control unit in the air-conditioning operation standby state to reduce power consumption, and achieves downsizing, weight reduction, and cost reduction of the outdoor unit. Objective.

In order to solve the above-described problems, the present invention relates to an indoor unit, an outdoor unit, a pair of power supply lines connecting the indoor unit and the outdoor unit, and connecting the indoor unit and the outdoor unit. One communication line, and a main power supply unit that is provided in the indoor unit or the outdoor unit, and that inputs a commercial power supply and supplies power to the indoor unit and the outdoor unit via the power line. An air conditioner,
The indoor unit includes an indoor unit control unit that controls main loads provided in the indoor unit, an indoor unit communication unit that communicates with the outdoor unit, and a switch that is supplied with power from the main power supply unit. Means driving power supply, and an indoor unit side communication line switching means for switching the output voltage of the switching means driving power supply and a signal from the indoor unit communication unit according to an instruction of the indoor unit control unit and connecting to the communication line. ,
The outdoor unit includes an outdoor unit control unit that controls main loads provided in the outdoor unit, an outdoor unit communication unit that communicates with the indoor unit, and a power source of the main power supply unit. A sub power supply for supplying power to the machine control unit,
According to an instruction from the outdoor unit control unit, an open / close means for opening and closing a power line for supplying power to a main load in the outdoor unit, and a main line for opening and closing a power line for supplying power to the main load and the sub power source Electric power switching means, and an outdoor unit side communication line switching means for switching and connecting the voltage of the communication line to the outdoor unit communication unit and the drive unit of the main power switching means,
When the outdoor unit control unit receives an instruction for a standby state from the indoor unit, the outdoor unit control unit opens the switching unit, and connects the communication line to the driving unit of the main power switching unit by the outdoor unit side communication line switching unit. The indoor unit control unit connects the voltage of the switching unit driving power source to the communication line by the indoor unit side communication line switching unit, and thereby opens and closes the main power via the outdoor unit side communication line switching unit. The driving unit of the means is driven to cut off the power to the outdoor unit, and the outdoor unit is shifted to a standby state.

  In the invention related to claim 2, when the indoor unit control unit shifts the outdoor unit from the standby state to the operation state, the indoor unit side communication line switching means sends a signal from the indoor unit communication unit to the indoor unit control unit. By connecting to the communication line and stopping the voltage application to the drive unit of the main power switching means, power is supplied to the outdoor unit via the main power switching means to start the outdoor unit control unit, The outdoor unit control unit connects the communication line to the outdoor unit communication unit by the outdoor unit side communication line switching unit, and shifts to the operation state according to an instruction received from the indoor unit via the communication line. It is a feature.

  In the invention according to claim 1, when the air-conditioning operation of the air conditioner shifts to the standby state, the outdoor unit control unit controls the opening / closing means to cut off the power supply to the main load. Thereafter, the indoor unit control unit controls the indoor unit side communication line switching unit, the outdoor unit control unit controls the outdoor unit side communication line switching unit, and disconnects the connection between the indoor unit communication unit and the outdoor unit communication unit, The main power switching means is connected to supply driving power from the switching means driving power source. The main power switching means that has received the driving power is switched to cut off the power supply from the commercial power source to the sub power source that supplies power to the outdoor unit control unit, and the outdoor unit control unit is shut off and stopped. Thereby, the power consumption in the outdoor unit in the standby state (hereinafter referred to as standby power) is set to zero.

  In the invention according to claim 2, when the standby state of the air conditioning operation is released, the indoor unit control unit controls the indoor unit side communication line switching unit to connect the main power switching unit and the switching unit drive power source. Shut off. As a result, the supply of drive power from the switching means drive power supply is cut off, so that the main power switching means is switched so that power can be supplied from the commercial power supply to the sub power supply that supplies power to the outdoor unit controller. The control unit is activated upon receiving power supply. The activated outdoor unit control unit controls the outdoor unit communication line switching unit to connect the indoor unit communication unit and the outdoor unit communication unit, and then controls the switching unit to start supplying power to the main load. .

  As described above, the power supply to the outdoor unit control unit and the interruption are controlled by the main power switching unit, and the main power switching unit is switched by the indoor unit side communication line switching unit controlled by the indoor unit control unit. Since the supply and shut-off are controlled, even when the outdoor unit control unit goes into a runaway state during the transition to the standby state of the air conditioning operation, the drive power is supplied to the main power switching unit by controlling the indoor unit side communication line switching unit. As a result, the power supply to the outdoor unit control unit can be cut off and the outdoor unit control unit can be stopped.

  In Conventional Example 2, since the control line from the outdoor unit controller 116 is connected to the second relay MR2, the pattern on the board needs to be wired so as to connect from the secondary side to the primary side. Although it was necessary to take the pattern distance between the primary side and the secondary side, in the present invention, the main power switching means is controlled by switching from the indoor unit (by the indoor unit control unit and the indoor unit side communication line switching unit). Yes, since wiring in the outdoor unit, that is, wiring from the signal line to the third switching unit via the outdoor unit side communication line switching unit is only required on the primary side, there is no need to increase the distance between patterns, and the area of the substrate is reduced. As a result, the size and weight of the outdoor unit can be reduced and the cost can be reduced.

  Further, in the second conventional example, when the self-test of the outdoor unit 102 is performed, the outdoor unit 102 is turned on when the power to the indoor unit 101 is turned on or no separate power is supplied from outside, that is, the outdoor unit 102 is turned on. Although the control unit 116 cannot be activated, in the present plan, the outdoor unit can be turned on by connecting the main power supply unit to a commercial power source, that is, the outdoor unit control unit can be activated. If the self-test switch is operated so that it can be activated in the self-test mode, the self-test can be easily performed.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. As an example, an air conditioner including a pair of indoor units, an outdoor unit, and a remote controller for operating the indoor unit will be described as an example.

  FIG. 1 is a configuration block diagram of an air conditioner according to the present invention. The indoor unit 1 is provided with an indoor unit control board 3 on which an indoor unit control unit 8 is mounted. Connected to the indoor unit control board 3 are a blower fan motor 19 connected to a blower fan (not shown) and a stepping motor 20 for wind direction plates for swinging up and down or left and right wind direction plates (not shown). A room temperature sensor 16 for detecting the temperature of the room and a refrigerant temperature sensor 14 for detecting the temperature of the refrigerant flowing through an indoor heat exchanger (not shown) are connected.

  The indoor unit control board 3 further includes a remote control receiving unit 12 that receives an infrared signal transmitted from a remote controller (not shown), a room temperature sensor input unit 15 that inputs a detection signal from the room temperature sensor 16, and a refrigerant temperature sensor 14. A refrigerant temperature sensor input unit 13 for inputting a detection signal and an indoor unit communication unit 10 for transmitting / receiving data to / from the outdoor unit 2 are provided.

  The indoor unit control unit 8 monitors the detection signals from the room temperature sensor 16 and the refrigerant temperature sensor 14 during the air conditioning operation, and controls the operation of the blower fan motor 19 and the wind direction plate stepping motor 20. Controls various functions.

  Moreover, the indoor unit 1 includes an indoor unit power supply unit 5 that converts AC power supplied from the outside into predetermined DC power corresponding to each device provided in the indoor unit 1 and supplies the converted DC power to each device. .

  On the other hand, the outdoor unit 2 is provided with an outdoor unit control board 4 on which an outdoor unit control unit 9 and an outdoor unit communication unit 11 that transmits and receives signals to and from the indoor unit 1 are mounted. A compressor 17 is connected to the outdoor unit control board 4 via an inverter 18 that controls the rotation of the compressor 17. In addition, an electromagnetic valve 21, an electric expansion valve 22, a four-way valve 23 for switching a refrigerant circuit for cooling operation and heating operation, and an outdoor fan motor 24 to which an outdoor fan (not shown) is connected are connected. Further, although not shown, sensors such as an outside air temperature sensor that detects the outside air temperature and a refrigerant temperature sensor that detects the refrigerant temperature flowing through the outdoor heat exchanger are connected to the outdoor unit control board 4.

  The outdoor unit control unit 9 monitors detection signals from the outside air temperature sensor and the refrigerant temperature sensor during the air conditioning operation, and communicates and receives signals necessary for the air conditioning operation with the indoor unit control unit 8, based on these signals. The outdoor fan motor 24, the compressor 17, the electromagnetic valve 21, the electric expansion valve 22, and the four-way valve 23 are controlled. Furthermore, the outdoor unit control unit 9 is provided with a watch dog timer.

  A main power supply unit 7 is connected to the outdoor unit 2, and AC power supplied from the main power supply unit 7 is supplied to the indoor unit power supply unit 5 provided in the indoor unit 1, and the outdoor unit 2 is connected to the outdoor unit 2. An outdoor unit power supply unit 6 is provided which converts into a predetermined DC power supply corresponding to each installed device and supplies the converted DC power to each device.

  FIG. 2 is a main part circuit block diagram of the air conditioner according to the present invention, in which (A) shows a case where the air-conditioning operation is changed from an operating state to a standby state (hereinafter referred to as a transition to the standby state), (B). Indicates a case where the operation state is changed from the standby state (hereinafter referred to as “when the standby state is released”). The indoor unit 1 includes a switching power supply 31 in addition to the indoor unit control unit 8, the indoor unit communication unit 10, and loads such as the blower fan motor 19 and the room temperature sensor 16 (hereinafter referred to as an indoor unit load 30). , A rectifier 39, a noise filter 32 for removing power supply noise, a first switching relay 46 that is an indoor unit side communication line switching means, a third switching relay drive power supply 48 that is a switching means drive power supply, and an indoor unit terminal unit 33. The indoor unit power supply unit 5 in FIG. 1 includes the switching power supply 31, the rectifier 39, and the noise filter 32 described above.

  The first switching relay 46 is controlled to be switched by the indoor unit control unit 8. In the first switching relay 46, the contact A is connected to the third switching relay drive power supply 48, the contact B is connected to the indoor unit communication unit 10, and the common terminal C is connected to the terminal 33 c of the indoor unit terminal unit 33.

  The third switching relay drive power supply 48 is supplied with power from the main power supply unit 7 and supplies drive power to a third switch relay drive unit 49 that switches a third switch relay 45 that is a main power switching means described later.

  The outdoor unit 2 includes the outdoor unit control unit 9, the outdoor unit communication unit 11, loads such as the electromagnetic expansion valve 22 and the four-way valve 23 (hereinafter referred to as the outdoor unit load 38), and the inverter 18. Switching power supply 37, rectifier 40, noise filter 36 for removing power supply noise, rectifier 41, switching means MR, third switching relay 45, third switching relay driver 49, and outdoor unit side communication line switching A second switching relay 47 as means, a smoothing capacitor 49 having both ends connected in parallel to the rectifier 41, an outdoor unit terminal unit 34, and a main power terminal unit 35 are provided. The opening / closing means MR includes a resistor 42, a first relay 43, and a second relay 44. The outdoor unit power supply unit 6 in FIG. 1 includes the switching power supply 37, the rectifier 40, the rectifier 41, and the noise filter 36 described above.

  The third switching relay 45 is connected between the noise filter 36 and the rectifier 40, and the contact A of the second switching relay 47 is connected to one end of the third switching relay drive unit 49. And the other end of the 3rd switching relay drive part 49 is connected to the power supply line L2 side. The contact B of the third switching relay 45 is connected to the rectifier 40, the common terminal C is connected to the noise filter 36, and the contact A is an empty terminal. Further, the contact B of the second switching relay 47 is connected to the outdoor unit communication unit 11, and the common terminal C is connected to the terminal 34 c of the outdoor unit terminal unit 34. The third switching relay 45 is controlled to be switched by the third switching relay driving unit 49 that receives power supply from the third switching relay driving power supply 48. When power supply is present, the third switching relay 45 is switched to the contact A and maintained in that state. When there is no power supply, it is switched to the contact B. The second switching relay 47 is controlled to be switched by the outdoor unit controller 9.

  The indoor unit 1 is provided with an indoor unit terminal part 33, and the outdoor unit 2 is provided with an outdoor unit terminal part 34. The terminals 33a and 34a are connected to the power line L1, and the terminals 33b and 34b are connected to the power line L2. The terminal 33c and the terminal 34c are connected to each other via the signal line Ls. The main power supply unit 7 is connected to the outdoor unit 2 via the main power terminal unit 35. The main power terminal unit 35 and the outdoor unit terminal unit 34 include a terminal 34a and a terminal 35a, and a terminal 34b and a terminal. 35b are connected to each other via the main power line Lac. Thereby, AC power is supplied to the indoor unit 1 and the outdoor unit 2 from the main power supply unit 7 respectively.

  In the indoor unit 1, AC power supplied from the main power supply unit 7 is input from the indoor unit terminal unit 33 to the rectifier 39 via the noise filter 32 and converted to DC power. The converted DC power is converted into a power supply voltage (for example, 12V) corresponding to each device such as the indoor unit control unit 8 and the indoor unit load 30 by the switching power supply 31 and supplied to each device. The AC power supplied from the main power supply unit 7 is also input to the third switching relay drive power supply 48 and converted into a predetermined voltage for driving the third switching relay 45.

  In the outdoor unit 2, the AC power supplied from the main power supply unit 7 passes through the noise filter 36, is input to the rectifier 40 via the switching power supply line Lsw and the third switching relay 45, and is converted to DC power. The converted DC power is converted into a power supply voltage (for example, 12 V) corresponding to each device such as the outdoor unit control unit 9 and the outdoor unit load 38 by the switching power source 37 and supplied to each device.

  The AC power supplied from the main power supply unit 7 is also input to the rectifier 41 via the noise filter 36, via the switching power supply line Lsw, the third switching relay 45, the inverter line Liv, and the switching means MR. It is converted into a DC power supply and supplied to the inverter 18. The opening / closing means MR is configured by connecting in parallel the first relay 43 and both ends of the circuit of the second relay 44 to which the resistor 42 is connected in series.

  The indoor unit communication unit 10 has one end connected to the indoor unit control unit 8 and the other end connected to the terminal 33c of the indoor unit terminal unit 33 via the first switching relay 46, and inputs from the indoor unit control unit 8 A serial signal is transmitted from the first switching relay 46 to the outdoor unit 2 via the terminal 33c, the signal line Ls, and the terminal 34c. The indoor unit communication unit 10 outputs a serial signal received from the outdoor unit 2 from the terminal 34c via the signal line Ls, the terminal 33c, and the first switching relay 46 to the indoor unit control unit 8.

  Similarly, the outdoor unit communication unit 11 has one end connected to the outdoor unit control unit 9 and the other end connected to the terminal 34c of the outdoor unit terminal unit 34 via the second switching relay 47. The serial signal input from the second switching relay 47 is transmitted to the indoor unit 1 via the terminal 34c, the signal line Ls, and the terminal 33c. The outdoor unit communication unit 11 outputs a serial signal received from the indoor unit 1 from the terminal 33c via the signal line Ls, the terminal 34c, and the second switching relay 47 to the outdoor unit control unit 9.

  FIG. 3 shows a circuit diagram of the third switching relay drive power supply 48. This circuit includes a diode 61, a capacitor 62, and a resistor A 63 and a resistor B 64 connected in series, and an AC power supply 60 is supplied from the main power supply unit 7. The signal line Ls is connected to the connection point P between the resistors A63 and B64, and the power supply line L2 is connected to the other connection point G of the resistor B64 (on the opposite side of the connection point P). The input AC power supply 60 is converted into a DC power supply by a diode 61 and a capacitor 62, and is divided into a predetermined voltage (for example, 12V) by a resistor A63 and a resistor B64, and is supplied via a signal line Ls and a power supply line L2. It is output as 3 relay drive power.

  In the circuit described here, the driving power of the third switching relay 45 is always output and the power is continuously consumed by the third switching relay driving power supply 48. For example, between the resistor A63 and the connection point P of the signal line Ls. When a switching element that performs on / off control in the indoor unit control unit 8 such as a photocoupler is provided so that the connection / disconnection to the connection point P of the resistor A63 can be performed, the switching element is turned on at a predetermined timing. Since the driving power is supplied to the third switching relay 45 only, the power consumption at the third switching relay driving power supply 48 can be reduced.

  In the configuration described above, the indoor unit control unit 8 transmits an operation stop signal to the outdoor unit control unit 9 via the signal line Ls during the transition to the standby state. The outdoor unit controller 9 that has received the operation stop signal first controls the switching means MR to cut off the power supply to the inverter 18, and then switches the second switching relay 47 from the switching outdoor unit communication unit 11 to the third switching relay. Switch to one end of the drive unit 49. The indoor unit control unit 8 controls the first switching relay 46 to switch from the indoor unit communication unit 10 to the third switching relay drive power supply 48 and supplies driving power to the third switching relay drive unit 49. The third switching relay driving unit 49 supplied with the driving power switches the third switching relay 45 to cut off the power supply to the switching power source 37, and the outdoor unit control unit 9 and the outdoor unit load 38 are stopped. Thereby, the power consumption of the outdoor unit 2 in the standby state can be made zero.

  When the standby state is released, the indoor unit control unit 8 controls the first switching relay 46 to switch from the third switching relay drive power supply 48 to the indoor unit communication unit 10, and the third switching relay via the signal line Ls. The drive power supplied to the drive unit 49 is cut off. Thereby, the 3rd switching relay drive part 49 switches the 3rd switching relay 45 to supply electric power to the switching power supply 37, and the outdoor unit control part 9 and the outdoor unit load 38 start. The activated outdoor unit control unit 9 controls the second switching relay 47 to switch from one end of the third switching relay drive unit 49 to the outdoor unit communication unit 11. Thereby, the indoor unit communication part 10 and the outdoor unit communication part 11 are connected, and communication with the indoor unit 1 can be performed. Further, the outdoor unit control unit 9 starts the power supply to the inverter 18 by controlling the opening / closing means MR. Then, the indoor unit 1 and the outdoor unit 2 communicate with each other to receive signals necessary for the air conditioning operation, and perform respective controls based on the signals to start the air conditioning operation.

  Next, the principle of power consumption reduction in the outdoor unit 2 at the time of transition to the standby state of the air conditioning operation or when the standby state is canceled and at the standby state will be described with reference to FIGS. 4A and 4B are diagrams illustrating operation timings of main parts of the indoor unit 1 and the outdoor unit 2 during the air-conditioning operation. FIG. 4A is a timing chart when the standby state is shifted, and FIG. 4B is a timing chart when the standby state is released. Respectively. In the following description, the operation of the switching relay is omitted and described, for example, when the common terminal C is switched from the contact A to the contact B.

  First, the standby state transition will be described. In FIG. 4A, (1) is an operation stop for stopping the outdoor unit 2 transmitted from the indoor unit control unit 8 when the user operates the remote controller (not shown) to stop the air conditioning operation. The signal is shown. Here, the waveforms of the signals input to and output from the indoor unit control unit 8 and the outdoor unit control unit 9 are shown, and a 5 V rectangular wave having a predetermined width is used. It may be a wave width or a voltage value. In (2) and (3) of FIG. 4 (A), the outdoor unit controller 9 that received the operation stop signal stopped the inverter 18 and opened the first relay 43 to cut off the operating power of the inverter 18. Is shown. The second relay 44 is always open during the air conditioning operation.

  Next, the outdoor unit control unit 9 transmits a signal indicating that the inverter 18 has been stopped to the indoor unit control unit 8, and then, as shown in (4) of FIG. 2 The switching relay 47 is controlled to switch from the contact B to the contact A. As a result, the signal line Ls is connected to one end of the third switching relay drive unit 49. The indoor unit control unit 8 that has received the signal to stop the inverter 18 from the outdoor unit control unit 9 controls the first switching relay 46 to switch from the contact B to the contact A as shown in (5) of FIG. .

  As a result, the driving power is supplied from the third switching relay driving power supply 48 to the third switching relay driving unit 49, and the third switching relay 45 is driven by the third switching relay driving as shown in (6) of FIG. The part 49 is switched from the contact B to the contact A, and this state is maintained. As a result, the switching power supply line Lsw is interrupted by the third switching relay 45, and the power supply from the main power supply unit 7 to the switching power supply 37 is stopped. Therefore, as shown in FIG. 4 (A) (7), the outdoor unit The control unit 9 and the outdoor unit load 38 are stopped.

  Next, a description will be given of when the standby state is released. When the user operates a remote controller (not shown) to start the air conditioning operation, the indoor unit control unit 8 first controls the first switching relay 46 and contacts A as shown in (6) of FIG. To contact B. As a result, the driving power supplied from the third switching relay driving power supply 48 to the third switching relay driving unit 49 is cut off, so that the third switching relay 45 is contacted as shown in (7) of FIG. Switch from A to contact B.

  When the third switching relay 45 is connected to the contact point B, the switching power supply line Lsw is connected by the third switching relay 45 and power is supplied from the main power supply unit 7 to the switching power supply 37, so that FIG. As shown in (8), the outdoor unit controller 9 and the outdoor unit load 38 are activated. The started outdoor unit control unit 9 controls the second switching relay 47 to switch from the contact A to the contact B as shown in (5) of FIG. Thereby, since the indoor unit communication part 10 and the outdoor unit communication part 11 are connected via the signal line Ls, communication between the indoor unit control part 8 and the outdoor unit control part 9 becomes possible. Then, a signal indicating that the indoor unit communication unit 10 and the outdoor unit communication unit 11 are connected and can communicate with each other is transmitted from the outdoor unit control unit 9 to the indoor unit control unit 8.

  Next, the outdoor unit control unit 9 closes the second relay 44 as shown in (2) of FIG. Next, the outdoor unit control unit 9 opens the second relay 44 after a predetermined time after the charging of the smoothing capacitor 49 is completed. Further, as shown in (3) of FIG. 4B, the outdoor unit control unit 9 performs control to close the first relay 43 when the charging of the smoothing capacitor 49 is completed and to maintain this state. As a result, operating power continues to be supplied to the inverter 18 even after the second relay 44 described above is opened.

  On the other hand, the indoor unit control unit 8 transmits an operation start signal as shown in (1) of FIG. 4B to the outdoor unit control unit 9. Here, as in FIG. 4A, the waveforms of signals input to and output from the indoor unit control unit 8 and the outdoor unit control unit 9 are shown. The waveform is a 5 V rectangular wave having a predetermined width, but this is not limited thereto. It may be any rectangular wave width or voltage value. The outdoor unit control unit 9 that has received the operation start signal activates the inverter 18 to start the air conditioning operation.

  As described above, the outdoor unit control unit 9 controls the opening / closing means MR to shut off the power supply to the inverter 18 when shifting to the standby state. Thereafter, the indoor unit control unit 8 supplies driving power from the third switching relay driving power supply 48 to the third switching relay driving unit 49 and controls the third switching relay 45 to cut off the power supply to the switching power supply 37. . Thereby, the outdoor unit control unit 9 and the outdoor unit load 38 are stopped, and the power consumption in the outdoor unit 2 in the standby state becomes zero.

  When the standby state is canceled, the indoor unit control unit 8 controls the third switching relay 45 by cutting off the operating power supplied from the third switching relay driving power source 48 to the third switching relay driving unit 49, and the switching power source. Power is supplied to 37 and the outdoor unit control unit 9 is activated. The activated outdoor unit control unit 9 controls the opening / closing means MR to start supplying power to the inverter 18 and activates the inverter 18 in accordance with an operation start signal from the indoor unit control unit 8.

  In the above description, when the microcomputer provided in the outdoor unit control unit 9, generally, the outdoor unit control unit 9 is in a runaway state due to noise or the like during the transition to the standby state, the microcomputer is interrupted by the watchdog timer. . The microcomputer that has received the interrupt first performs control to switch the second switching relay 47 from the contact B to the contact A. On the other hand, the indoor unit control unit 8 controls the first switching relay 46 to switch from the contact point B to the contact point A when no signal is received from the outdoor unit control unit 9 for a certain period of time. In this way, the driving power is supplied from the third switching relay driving power supply 48 to the third switching relay driving section 49, and the third switching relay 45 is switched from the contact B to the contact A. Therefore, the main power supply section 7 switches to the switching power supply 37. The power supply to is stopped, and the outdoor unit control unit 9 and the outdoor unit load 38 are stopped.

  Next, specific operations of the indoor unit 1 and the outdoor unit 2 when shifting to the standby state and when canceling the standby state will be described with reference to FIGS. 1, 2, and 4. First, an operation at the time of transition to the standby state illustrated in FIG. The first switching relay 46, the second switching relay 47, and the third switching relay 45 during the air conditioning operation are all switched to the contact point B.

  The user operates the remote controller (not shown) to stop the air conditioning operation. The remote controller converts the operation stop code into an infrared signal and transmits it to the indoor unit 1. The transmitted infrared signal is output to the indoor unit control unit 8 via the remote control receiving unit 12. Receiving this, the indoor unit control unit 8 outputs an operation stop signal as shown in (1) of FIG. 4A to the indoor unit communication unit 10 in order to stop the outdoor unit 2. At this time, the indoor unit control unit 8 also stops supplying power to the indoor unit load 30 at the same time, and shifts to a standby state in which only the indoor unit control unit 8 and the remote control receiving unit 12 are maintained.

  The indoor unit communication unit 10 transmits the received operation stop signal. The transmitted signal is transmitted from the contact B of the first switching relay 46 to the common terminal C, the terminal 33c of the indoor unit terminal unit 33, the signal line Ls, the terminal 34c of the outdoor unit terminal unit 34, and the common terminal C of the second switching relay 47. To the outdoor unit communication unit 11 via the contact B. The outdoor unit communication unit 11 outputs the received signal to the outdoor unit control unit 9.

  Receiving the operation stop signal, the outdoor unit control unit 9 starts preparations for shifting to the stop state. The outdoor unit controller 9 first stops the inverter 18 as shown in (3) of FIG. Thereafter, the outdoor unit controller 9 opens the first relay 43 as shown in (2) of FIG. Since the second relay 44 is opened during the air conditioning operation, the supply of operating power to the inverter 18 is cut off. The outdoor unit control unit 9 transmits to the indoor unit control unit 8 that the inverter 18 has been stopped, and controls the second switching relay 47 to switch from the contact B to the contact A as shown in (4) of FIG. Accordingly, the signal line Ls is connected to one end of the third switching relay drive unit 49 via the terminal 34 c of the outdoor unit terminal unit 34.

  The indoor unit control unit 8 that has received the inverter stop signal from the outdoor unit control unit 9 controls the first switching relay 46 to switch from the contact B to the contact A as shown in (5) of FIG. As a result, the third switching relay drive power supply 48 is connected from the contact A of the first switching relay 46 to the common terminal C, the terminal 33c of the indoor unit terminal unit 33, the signal line Ls, the terminal 34c of the outdoor unit terminal unit 34, and the second switching relay. 47 common terminals C are connected to the third switching relay drive unit 49 via the contact A.

  Thus, driving power is supplied from the third switching relay driving power supply 48 to the third switching relay driving unit 49, and as shown in (6) of FIG. 45 is switched from the contact B to the contact A, and this state is maintained. As a result, the AC power supplied from the main power supply unit 7 is interrupted by the third switching relay 45 on the switching power supply line Lsw, so that the power supply to the switching power source 37 is interrupted and the outdoor unit control unit 9 and the outdoor unit The load 38 stops.

  Next, an operation at the time of canceling the standby state illustrated in FIG. The first switching relay 46, the second switching relay 47, and the third switching relay 45 in the standby state are all switched to the contact A. The user operates a remote controller (not shown) to start the air conditioning operation. The remote control converts the operation start code into an infrared signal and transmits it to the indoor unit 1. The transmitted infrared signal is output to the indoor unit control unit 8 via the remote control receiving unit 12. Receiving this, the indoor unit controller 8 first controls the first switching relay 46 to switch from the contact A to the contact B as shown in (6) of FIG. At this time, the indoor unit control unit 8 starts to supply power to the indoor unit load 30 at the same time, and prepares to shift to the operating state.

  When the first switching relay 46 is switched from the contact A to the contact B, the indoor unit communication unit 10 is connected to the signal line Ls via the terminal 33 c of the indoor unit terminal unit 33. On the other hand, the connection of the third switching relay driving power supply 48 is cut off, the supply of driving power to the third switching relay driving unit 49 is stopped, and the third switching relay 45 as shown in (7) of FIG. Switches from contact A to contact B. Since the interruption of the switching power supply line Lsw by the third switching relay 45 is released, power is supplied from the main power supply unit 7 to the switching power supply 37, and the outdoor unit as shown in (8) of FIG. 4B. The control unit 9 and the outdoor unit load 38 are activated.

  The started outdoor unit control unit 9 controls the second switching relay 47 to switch from the contact A to the contact B as shown in (5) of FIG. Thereby, the indoor unit communication unit 10 and the outdoor unit communication unit 11 are connected from the contact B of the first switching relay 46 to the common terminal C, the terminal 33c of the indoor unit terminal unit 33, the signal line Ls, and the terminal 34c of the outdoor unit terminal unit 34. The second switching relay 47 is connected from the common terminal C via the contact B, and communication between the indoor unit 1 and the outdoor unit 2 becomes possible.

  Next, the outdoor unit controller 9 first closes the second relay 44 as shown in (2) of FIG. 4B (the state in which the switch is indicated by a broken line in the second relay 44 of FIG. 2B). ). A resistor 42 is connected in series to the second relay 44, and an inrush current to the smoothing capacitor 49 can be reduced and damage to the smoothing capacitor 49 can be prevented. When the second relay 44 is closed, the smoothing capacitor 49 is charged. When the charging is completed, the outdoor unit controller 9 closes the first relay 43 as shown in (3) of FIG. To do.

  The first relay 43 is kept closed by the outdoor unit controller 9. In this way, supply of operating power to the inverter 18 is started, and when the outdoor unit control unit 9 receives an operation start signal transmitted from the indoor unit control unit 8 shown in (1) of FIG. The machine control unit 9 activates the inverter 18 and air conditioning operation is started. When the air conditioning operation is started, the indoor unit control unit 8 monitors the detection signals from the room temperature sensor 16 and the refrigerant temperature sensor 14, and controls the operation of the blower fan motor 19 and the wind direction plate stepping motor 20, etc. Controls various functions of the air conditioner.

  The outdoor unit control unit 9 monitors detection signals from the outside air temperature sensor and the refrigerant temperature sensor, and communicates and receives signals necessary for the air conditioning operation with the indoor unit control unit 8, and based on these signals, the outdoor unit The fan motor 24, the compressor 17, the electromagnetic valve 21, the electric expansion valve 22, and the four-way valve 23 are controlled. The second relay 44 is opened after a predetermined time after the first relay 43 is closed as shown in FIG. 4B (2) (the second relay 44 in FIG. 2B). The switch is indicated by a solid line).

  Next, using the flowcharts representing the processing in the indoor unit control unit 8 provided in the indoor unit 1 and the outdoor unit control unit 9 provided in the outdoor unit 2 shown in FIG. 1 and FIG. A flow in the case of state transition will be described. The flowchart of FIG. 5 shows the processing at the time of cancellation of the standby state and the transition to the standby state in each of the indoor unit control unit 8 and the outdoor unit control unit 9, and (A) is the processing in the indoor unit control unit 8. ) Shows processing in the outdoor unit control unit 9 respectively. ST represents a step, and the numbers following this represent a step number.

  First, processing in the indoor unit control unit 8 will be described with reference to FIG. When AC power is supplied from the main power supply unit 7, operating power is also supplied to the indoor unit control unit 8, and the indoor unit control unit 8 is turned on. The indoor unit control unit 8 determines whether or not the user has received a remote control signal transmitted by operating the remote control (ST1). If the remote control signal is not received (ST1-No), the indoor unit control unit 8 maintains the state if the indoor unit 1 is in the standby state, and based on the setting instructed by the user if the indoor unit 1 is in the operating state. The normal control such as the control is performed (ST5), and the process jumps to ST1.

  If the indoor unit control unit 8 has received a remote control signal (ST1-Yes), it is next determined whether or not the signal is an operation start signal (ST2). If it is a driving | operation start signal (ST2-Yes), the indoor unit control part 8 will switch the 1st switching relay 46 from the contact A to the contact B (ST6). Then, the operation of the indoor unit load 30 such as the position adjustment of the wind direction plate is started (ST7), and the process jumps to ST1.

  If the signal received by the indoor unit control unit 8 is not an operation start signal (ST2-No), it is next determined whether or not the signal is an operation stop signal (ST3). If it is a driving | operation stop signal (ST3-Yes), the indoor unit control part 8 will switch the 1st switching relay 46 from the contact B to the contact A (ST8). Then, the operation of the indoor unit load 30 is stopped (ST9), and the process jumps to ST1.

  If the signal received by the indoor unit control unit 8 is not an operation stop signal (ST3-No), it is then determined whether the signal is another setting signal such as temperature or air volume (ST4). If it is another setting signal (ST4-Yes), the indoor unit control unit 8 performs air-conditioning control corresponding to the setting signal (ST10), and jumps to ST1. If the received signal is not the other setting signal (ST4-No), the process jumps to ST1.

    Next, processing in the outdoor unit control unit 9 will be described with reference to FIG. When the third switching relay 45 is connected to the contact point B and AC power is supplied from the main power supply unit 7, the operating power is also supplied to the outdoor unit control unit 9, and the outdoor unit control unit 9 is turned on. The outdoor unit control unit 9 first switches the second switching relay 47 from the contact A to the contact B so as to be able to communicate with the indoor unit control unit 8 (ST21).

  Next, the outdoor unit control unit 9 determines whether a signal is received from the indoor unit control unit 8 (ST22). If the signal is not received (ST22-No), the outdoor unit control unit 9 maintains the state if the outdoor unit 2 is in the standby state, and based on the setting instructed by the indoor unit 1 if the outdoor unit 2 is in the operating state. The normal control such as the control is performed (ST25), and the process jumps to ST22.

  If the outdoor unit control unit 9 receives a signal from the indoor unit control unit 8 (ST22-Yes), it next determines whether or not the signal is an operation start signal (ST23). If it is an operation start signal (ST23-Yes), the outdoor unit controller 9 closes the second relay 44 (ST26), and then closes the first relay 43 (ST27) to supply power to the inverter 18 and operate. Start (ST28). Then, the second relay 44 is opened again (ST29), the operation of the outdoor unit load 38 is started (ST30), and the process jumps to ST22.

  If the signal received by the outdoor unit controller 9 is not an operation start signal (ST23-No), it is next determined whether or not the signal is an operation stop signal (ST24). If it is a driving | operation stop signal (ST24-Yes), the outdoor unit control part 9 will stop the inverter 18 (ST31), and will open the 1st relay 43 (ST32). Then, the second switching relay 47 is switched from the contact B to the contact A (ST33), and the operation of the outdoor unit load 38 is stopped (ST34). Thereafter, when the third switching relay 45 is switched from the contact B to the contact A and the AC power from the main power supply unit 7 is shut off, the outdoor unit control unit 9 is turned off. If the received signal is not an operation stop signal (ST24-No), the process jumps to ST22.

  As described above, according to the present invention, when the air conditioning operation of the air conditioner shifts to the standby state, the outdoor unit control unit controls the opening / closing means to cut off the power supply to the main load. Thereafter, the indoor unit control unit controls the indoor unit side communication line switching unit, the outdoor unit control unit controls the outdoor unit side communication line switching unit, and disconnects the connection between the indoor unit communication unit and the outdoor unit communication unit, The main power switching means is connected to supply driving power from the switching means driving power source. The main power switching means that has received the driving power is switched to cut off the power supply from the commercial power source to the sub power source that supplies the power to the outdoor unit control unit, and the outdoor unit control unit is shut off and stopped. Thereby, the standby power in the outdoor unit in the standby state is set to zero.

  Further, when the standby state of the air conditioning operation is released, the indoor unit control unit controls the indoor unit side communication line switching unit to cut off the connection between the main power switching unit and the switching unit driving power source. As a result, the supply of drive power from the switching means drive power supply is cut off, so that the main power switching means is switched so that power can be supplied from the commercial power supply to the sub power supply that supplies power to the outdoor unit controller. The control unit is activated upon receiving power supply. The activated outdoor unit control unit controls the outdoor unit communication line switching unit to connect the indoor unit communication unit and the outdoor unit communication unit, and then controls the switching unit to start supplying power to the main load. .

  As described above, the power supply to the outdoor unit control unit and the interruption are controlled by the main power switching unit, and the main power switching unit is switched by the indoor unit side communication line switching unit controlled by the indoor unit control unit. Since the supply and shut-off are controlled, even when the outdoor unit control unit goes into a runaway state during the transition to the standby state of the air conditioning operation, the drive power is supplied to the main power switching unit by controlling the indoor unit side communication line switching unit. As a result, the power supply to the outdoor unit control unit can be cut off and the outdoor unit control unit can be stopped.

  In Conventional Example 2, since the control line from the outdoor unit controller 116 is connected to the second relay MR2, the pattern on the board needs to be wired so as to connect from the secondary side to the primary side. Although it was necessary to take the pattern distance between the primary side and the secondary side, in the present invention, the main power switching means is controlled by switching from the indoor unit (by the indoor unit control unit and the indoor unit side communication line switching unit). Yes, since wiring in the outdoor unit, that is, wiring from the signal line to the third switching unit via the outdoor unit side communication line switching unit is only required on the primary side, there is no need to increase the distance between patterns, and the area of the substrate is reduced. As a result, the size and weight of the outdoor unit can be reduced and the cost can be reduced.

Further, in the second conventional example, when the self-test of the outdoor unit 102 is performed, the outdoor unit 102 is turned on when the power to the indoor unit 101 is turned on or no separate power is supplied from outside, that is, the outdoor unit 102 is turned on. Although the control unit 116 cannot be activated, in the present plan, the outdoor unit can be turned on by connecting the main power supply unit to a commercial power source, that is, the outdoor unit control unit can be activated. If the self-test switch is operated so that it can be activated in the self-test mode, the self-test can be easily performed.

It is a block diagram of the configuration of an embodiment of an air conditioner according to the present invention. It is a principal part circuit block diagram in the Example of the air conditioner by this invention, (A) is the circuit block diagram at the time of standby state transfer, (B) has shown the circuit block diagram at the time of standby state cancellation | release. It is a circuit diagram which shows a 3rd switching relay drive power supply. It is explanatory drawing explaining the operation | movement timing of the principal part at the time of standby state transfer / release, (A) is a timing chart at the time of standby state transfer, (B) is a timing chart at the time of standby state cancellation | release. It is a flowchart which shows the process at the time of standby state transfer / release, (A) shows the process in an indoor unit control part, (B) has shown the process in an outdoor unit control part. It is a circuit block diagram which shows the conventional air conditioner. It is a principal part circuit block diagram which shows the conventional air conditioner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Indoor unit 2 Outdoor unit 5 Indoor unit power supply part 6 Outdoor unit power supply part 7 Main power supply part 8 Indoor unit control part 9 Outdoor unit control part 10 Indoor unit communication part 11 Outdoor unit communication part 12 Remote control receiving part 17 Compressor 18 Inverter DESCRIPTION OF SYMBOLS 30 Indoor unit load 31 Switching power supply 37 Switching power supply 38 Outdoor unit load 39 Rectifier 40 Rectifier 41 Rectifier 42 Resistance 43 1st relay 44 2nd relay 45 3rd switching relay 46 1st switching relay 47 2nd switching relay 48 3rd switching relay Drive power supply 49 Third switching relay drive section L1 power supply line L2 power supply line Ls signal line Lac main power line Lsw switching power supply line Liv inverter line MR switching means

Claims (2)

An indoor unit, an outdoor unit, a pair of power lines connecting the indoor unit and the outdoor unit, a single communication line connecting the indoor unit and the outdoor unit, and the indoor unit or the outdoor unit, An air conditioner including a main power supply unit that inputs commercial power and supplies power to the indoor unit and the outdoor unit via the power line,
The indoor unit includes an indoor unit control unit that controls main loads provided in the indoor unit, an indoor unit communication unit that communicates with the outdoor unit, and a switch that is supplied with power from the main power supply unit. Means driving power supply, and an indoor unit side communication line switching means for switching the output voltage of the switching means driving power supply and a signal from the indoor unit communication unit according to an instruction of the indoor unit control unit and connecting to the communication line. ,
The outdoor unit includes an outdoor unit control unit that controls main loads provided in the outdoor unit, an outdoor unit communication unit that communicates with the indoor unit, and a power source of the main power supply unit. A sub power supply for supplying power to the machine control unit,
According to an instruction from the outdoor unit control unit, an open / close means for opening and closing a power line for supplying power to a main load in the outdoor unit, and a main line for opening and closing a power line for supplying power to the main load and the sub power source Electric power switching means, and an outdoor unit side communication line switching means for switching and connecting the voltage of the communication line to the outdoor unit communication unit and the drive unit of the main power switching means,
When the outdoor unit control unit receives an instruction for a standby state from the indoor unit, the outdoor unit control unit opens the switching unit, and connects the communication line to the driving unit of the main power switching unit by the outdoor unit side communication line switching unit. The indoor unit control unit connects the voltage of the switching unit driving power source to the communication line by the indoor unit side communication line switching unit, and thereby opens and closes the main power via the outdoor unit side communication line switching unit. An air conditioner characterized in that the driving unit of the means is driven to cut off the power to the outdoor unit and to shift the outdoor unit to a standby state.   The indoor unit control unit connects the signal from the indoor unit communication unit to the communication line by the indoor unit side communication line switching means when the outdoor unit shifts from the standby state to the operation state, and the main power By stopping the application of voltage to the drive unit of the switching means, power is supplied to the outdoor unit via the main power switching unit to start the outdoor unit control unit, and the outdoor unit control unit is connected to the outdoor unit. 2. The air according to claim 1, wherein the communication line is connected to the outdoor unit communication unit by a side communication line switching unit, and transitions to the operation state according to an instruction received from the indoor unit via the communication line. Harmony machine.