Air conditioner

Abstract

The air conditioner (1) comprises a first unit (10) and a second unit (20). The first unit (10) and the second unit (20) are connected via a connecting power line (62) and a connecting ground line (72), the connecting power line supplies power from the first unit (10) to the second unit (20), the connecting ground line (72) connects the ground (E) of the first unit (10) and the second unit (20), the first unit (10) comprises a capacitor (14a), the capacitor is connected between the connecting power line (62) and the ground (E) of the first unit (10), and the connecting power line (62) and the connecting ground line (72) pass through the hole of the magnetic body (40). The magnetic body (40) is constructed in the following manner: when current flows from one of the first unit (10) and the second unit (20) to the other in the connecting power line (62) and the connecting ground line (72), the direction of the magnetic flux generated in the magnetic body (40) due to the current flowing in the connecting power line (62) is the same as the direction of the magnetic flux generated in the magnetic body (40) due to the current flowing in the connecting ground line (72).

Description

Technical Field

[0001] The present disclosure relates to an air conditioner. Background Art

[0002] In an air conditioner that connects an outdoor unit to one or more indoor units, the inverter circuit of each unit constitutes a source of noise current. The noise current in the low frequency band is mainly propagated in the power line and the ground line as conducted noise, and the noise current in the high frequency band is mainly propagated in the space as radiated noise, using the power line and the ground line as antennas. As an existing noise measure, a noise filter for reducing conducted noise and a ferrite core for reducing radiated noise are provided in each unit. Therefore, in an air conditioner that connects an outdoor unit to one or more indoor units, multiple noise filters and ferrite cores are required. As a noise measure, Patent Document 1 discloses a structure in which multiple ferrite cores are provided in an electric unit.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2008-125248 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] exist Figure 6In the air conditioner 100 shown, which includes an outdoor unit 110 connected to an external power source 150 and an indoor unit 120 powered by the outdoor unit 110, a noise current is generated due to the switch of the inverter circuit 127 of the control substrate 123 provided in the indoor unit 120. The noise current is propagated as a conducted noise to the device 130 connected to the connection terminal 118 via the connection power line 162 and the connection ground line 172. Normally, in order to reduce the conducted noise generated from the indoor unit 120, a noise filter 124 is provided in the indoor unit 120. In addition, in order to reduce the conducted noise generated from the outdoor unit 110, a noise filter 114 is provided in the outdoor unit 110. However, the inventors of the present disclosure have found that the noise filter 114 of the outdoor unit 110 can also be used as a noise filter for reducing the conducted noise generated from the indoor unit 120. By causing the noise current generated from the indoor unit 120 to flow back in the noise path N1, the noise propagated to the device 130 connected to the connection terminal 118 is reduced. The noise path N1 includes the motor 122, the housing 121 of the indoor unit 120, the connection ground line 172, the housing 111 of the outdoor unit 110, the noise filter 114, the first connection power line 163, the connection power line 162, and the second connection power line 164. By reducing the conducted noise generated from the indoor unit 120 by using the noise filter 114 of the outdoor unit 110, the noise filter 124 of the indoor unit 120 can be simplified or removed.

[0008] Figure 7 Published in Figure 6 The air conditioner 100 shown in the figure is provided with a magnetic body 140 to implement a measure for the radiation noise generated from the outdoor unit 110. A noise current is generated due to the switch of the inverter circuit 117 provided on the control substrate 113 of the outdoor unit 110. Since the noise current flows in the noise path E1, radiation noise using the connection power line 162 as an antenna is generated. The noise path E1 includes the motor 112, the housing 111 of the outdoor unit 110, the ground E, the connection power line 162, and the first connection power line 163. By providing the magnetic body 140 on the first connection power line 163 in the noise path E1, the noise current is reduced, and the radiation noise is reduced.

[0009] However, in Figure 7 In the air conditioner 100 shown in FIG. 1 , the inventors of the present disclosure have found that, among the noise currents generated by the switching of the inverter circuit 127, the current of the noise path N1 (see FIG. Figure 6) is reduced, while the current of the noise path N2 is increased. The noise path N2 includes the motor 122, the housing 121, the connection ground wire 172, the connection terminal 118, the connection ground wire 132, the device 130, the connection power line 131, the connection power line 162, and the second connection power line 164. It was found that the main factor for the reduction of the current of the noise path N1 and the increase of the current of the noise path N2 is that since the magnetic body 140 is provided on the first connection power line 163, the resistance of the path of the magnetic body 140 part is increased, the noise current flowing in the noise filter 114 of the outdoor unit 110 is reduced, and the backflow is hindered.

[0010] Based on the above findings, an object of the present disclosure is to provide an air conditioner capable of reducing the influence of noise with a simple structure.

[0011] Technical solutions adopted to solve technical problems

[0012] An air conditioner according to a first aspect is an air conditioner comprising a first unit and a second unit, wherein the first unit and the second unit are connected via a connecting power line and a connecting ground line, the connecting power line supplies power from the first unit to the second unit, the connecting ground line connects the grounds of the first unit and the second unit, the first unit comprises a capacitor, the capacitor is connected between the connecting power line and the ground of the first unit, the connecting power line and the connecting ground line pass through a hole of a magnetic body, and the magnetic body is constructed in the following manner: when current flows from one of the first unit and the second unit to the other in the connecting power line and the connecting ground line, the direction of the magnetic flux generated in the magnetic body due to the current flowing in the connecting power line is the same as the direction of the magnetic flux generated in the magnetic body due to the current flowing in the connecting ground line.

[0013] According to this structure, the radiation noise originating from the first unit using the connection power line as an antenna is reduced by the magnetic body. In addition, the radiation noise originating from the first unit using the connection ground line as an antenna is reduced. On the other hand, since the noise current originating from the second unit that flows in the connection power line and the connection ground line and refluxes between the first unit and the second unit flows in the connection power line and the connection ground line in the opposite direction, the direction of the magnetic flux generated in the magnetic body due to the current flowing in the connection power line is opposite to the direction of the magnetic flux generated in the magnetic body due to the current flowing in the connection ground line, and the magnetic fluxes cancel each other, so the reflux is not hindered. Thus, the influence of noise can be reduced with a simple structure.

[0014] The air conditioner according to the second aspect further includes a third unit powered by the first unit, the first unit further includes a connection terminal connecting the second unit and the third unit to the first unit, and the magnetic body is provided between the connection terminal and the capacitor.

[0015] According to this configuration, it is possible to suppress the conduction noise from the second unit from flowing to the third unit with a simple configuration.

[0016] According to the air conditioner of the third aspect, the connection ground wire is a refrigerant pipe through which the refrigerant circulates between the first unit and the second unit.

[0017] According to this configuration, since the refrigerant pipe is used as the ground connection wire, the influence of noise can be reduced with a simple structure.

[0018] An air conditioner according to a fourth aspect is an air conditioner comprising a first unit and a second unit, wherein the first unit comprises a capacitor connected between a connecting power line and a ground, a shell connected to the ground and having conductivity, and a protrusion protruding from the shell and having conductivity, the first unit and the second unit are connected via a connecting power line and a connecting ground line, the connecting power line supplies power from the first unit to the second unit, the connecting ground line connects the grounds of the first unit and the second unit, the protrusion is connected to the connecting ground line, the connecting power line and the protrusion pass through a hole in a magnetic body, and the magnetic body is constructed in the following manner: when current flows from one of the first unit and the second unit to the other in the connecting power line and the connecting ground line, the direction of the magnetic flux generated in the magnetic body due to the current flowing in the connecting power line is the same as the direction of the magnetic flux generated in the magnetic body due to the current flowing in the protrusion.

[0019] According to this structure, the radiation noise originating from the first unit using the connection power line as an antenna is reduced by the magnetic body. In addition, the radiation noise originating from the first unit using the connection ground line as an antenna is reduced. On the other hand, since the noise current originating from the second unit that flows in the connection power line and the connection ground line and refluxes between the first unit and the second unit flows in the connection power line and the protrusion in the opposite direction, the direction of the magnetic flux generated in the magnetic body due to the current flowing in the connection power line is opposite to the direction of the magnetic flux generated in the magnetic body due to the current flowing in the protrusion, and the magnetic fluxes cancel each other out, so the reflux is not hindered. Thus, the influence of noise can be reduced with a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a circuit diagram showing a schematic configuration of an air conditioner according to the first embodiment.

[0021] Figure 2 is with Figure 1 A circuit diagram showing a schematic configuration of the air conditioner including a third unit related to the air conditioner described above.

[0022] Figure 3 This is a circuit diagram showing a schematic configuration of an air conditioner according to a second embodiment.

[0023] Figure 4 This is a circuit diagram showing a schematic configuration of an air conditioner according to a third embodiment.

[0024] Figure 5 This is a circuit diagram showing a schematic configuration of an air conditioner according to a modified example.

[0025] Figure 6 This is a circuit diagram showing an example of the arrangement of a noise filter in an air conditioner.

[0026] Figure 7 is with Figure 6 A circuit diagram showing an example of a magnetic body arrangement related to an air conditioner. DETAILED DESCRIPTION

[0027] (First Embodiment)

[0028] Below, refer to Figure 1 as well as Figure 2 , an air conditioner 1 according to a first embodiment will be described. The present disclosure is not limited to the examples described below, but is indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

[0029] The air conditioner 1 includes a first unit 10 and a second unit 20, wherein the first unit 10 is connected to an external power source 50, and power is supplied from the first unit 10 to the second unit 20. In one example, the first unit 10 is an outdoor unit installed outdoors, and the second unit 20 is an indoor unit installed on the back side of the ceiling or a wall surface indoors. Hereinafter, the first unit 10 is described as an outdoor unit and the second unit 20 is described as an indoor unit. The external power source 50 is an AC power source. The first unit 10 and the external power source 50 are connected through a power line 60 and a ground line 70. The ground line 70 is connected to the ground E. The first unit 10 and the second unit 20 are connected through a connecting power line 62, a connecting ground line 72, and a refrigerant pipe 80. The connecting power line 62 supplies power from the external power source 50 to the second unit 20. The connecting ground line 72 connects the ground E of the first unit 10 and the second unit 20. The refrigerant pipe 80 is filled with a refrigerant, and the refrigerant circulates between the first unit 10 and the second unit 20. The refrigerant pipe 80 is formed of a conductive material, an example of which is copper.

[0030] The first unit 10 includes a housing 11. The housing 11 is made of a conductive material, an example of which is sheet metal. A motor 12 and a control substrate 13 for supplying power to the motor 12 are provided in the housing 11. In one example, the motor 12 drives at least one of a compressor or a blower. The control substrate 13 includes a noise filter 14 for reducing conducted noise, a rectifier circuit 15 for converting AC power from an external power supply 50 into DC power, a smoothing circuit 16 for removing AC power, and an inverter circuit 17 for converting DC power into AC power. The noise filter 14 reduces current of a specific frequency. The noise filter 14 includes a capacitor 14a and a coil 14b. The housing 11 and the control substrate 13 are connected via a first ground wire 71a. The capacitor 14a is provided on a connection wire that connects the connecting power line 62 to the ground E.

[0031] The first unit 10 includes a connection terminal 18 for connecting a power line and a ground line inside and outside the housing 11. An example of the connection terminal 18 is a terminal block. The connection terminal 18 includes a first connection terminal 18a and a second connection terminal 18b. The first connection terminal 18a is provided between the external power supply 50 and the control substrate 13 of the first unit 10, and is connected to the power line 60 in the housing 11. The second connection terminal 18b is provided between the second unit 20 and the control substrate 13 of the first unit 10, and is connected to the connection power line 62 and the connection ground line 72 in the housing 11. The first power line 61 extending from the first connection terminal 18a into the housing 11 is connected to the control substrate 13 and the motor 12. The first connection power line 63 extending from the second connection terminal 18b into the housing 11 is connected to the first power line 61 on the control substrate 13. The first ground line 71b extending from the second connection terminal 18b into the housing 11 is connected to the housing 11.

[0032] The first unit 10 has a magnetic body 40 in the housing 11. The magnetic body 40 has a hole through which the first connecting power line 63 and the first ground line 71b pass. The magnetic body 40 is configured in the following manner: when the current flows from one of the first unit 10 and the second unit 20 to the other in the first connecting power line 63 and the first ground line 71b, the direction of the magnetic flux generated in the magnetic body 40 due to the current flowing in the first connecting power line 63 is the same as the direction of the magnetic flux generated in the magnetic body 40 due to the current flowing in the first ground line 71b. In one example, the magnetic body 40 is a ferrite core. The ferrite core is formed by a collection of one or more ferrite cores. The first connecting power line 63 and the first ground line 71b may simply pass through the hole of the magnetic body 40, or may be wound around the magnetic body 40 once or several times.

[0033] The first unit 10 also includes a first refrigerant device, a blower, and a control device for forming a refrigerant circuit not shown. The first refrigerant device is connected to the refrigerant piping 80. The first refrigerant device includes a compressor, a four-way reversing valve, a heat exchanger, and a stop valve. The compressor sucks in the refrigerant and discharges it after compressing it. In one example, the compressor is a volumetric compressor of a scroll type or a screw type. The four-way reversing valve, the heat exchanger, and the stop valve are arranged in the refrigerant piping in the first unit 10 not shown. The blower generates an air flow that flows out of the first unit 10. The control device controls the switch of the inverter circuit 17, for example. The control device includes a processing device and a storage unit that executes a predetermined control program. The processing device includes, for example, a CPU (central processing unit) or an MPU (micro processing unit). Information for various control programs and various control processes is stored in the storage unit. The storage unit includes, for example, a non-volatile memory and a volatile memory.

[0034] The second unit 20 includes a housing 21. The housing 21 is made of a conductive material, an example of which is sheet metal. A motor 22 and a control substrate 23 for supplying power to the motor 22 are provided in the housing 21. In one example, the motor 22 drives the blower. The control substrate 23 includes a noise filter 24 for reducing conducted noise, a rectifier circuit 25 for converting AC power from the first unit 10 into DC power, a smoothing circuit 26 for removing AC power, and an inverter circuit 27 for converting DC power into AC power. The noise filter 24 reduces current of a specific frequency. The noise filter 24 includes a capacitor 24a and a coil 24b. The housing 21 and the control substrate 23 are connected via a second ground wire 73.

[0035] The second unit 20 includes a connection terminal 28 for connecting the power line inside and outside the housing 21 to the ground line. An example of the connection terminal 28 is a terminal block. The connection terminal 28 is provided between the first unit 10 and the control substrate 23 of the second unit 20, and is connected to the connection power line 62 in the housing 21. The second connection power line 64 extending from the connection terminal 28 into the housing 21 is connected to the control substrate 23 and the motor 22.

[0036] The second unit 20 further includes a second refrigerant device, a blower, and a control device for forming a refrigerant circuit (not shown). The second refrigerant device is connected to the refrigerant pipe 80. The second refrigerant device includes a heat exchanger. The blower generates an air flow that blows cold air or hot air out of the second unit 20. The control device controls, for example, the switch of the inverter circuit 27. The control device includes a processing device and a storage unit that execute a predetermined control program.

[0037] The air conditioner 1 is formed with a plurality of parasitic capacitors C1, C2, C3, C4, C5, and C6. The parasitic capacitor C1 is a parasitic capacitor between the motor 12 and the housing 11 of the first unit 10. The parasitic capacitor C2 is a parasitic capacitor between the housing 11 of the first unit 10 and the ground E. The parasitic capacitor C3 is a parasitic capacitor between the ground E and the connecting ground line 72. The parasitic capacitor C4 is a parasitic capacitor between the ground E and the connecting power line 62. The parasitic capacitor C5 is a parasitic capacitor between the housing 21 of the second unit 20 and the ground E. The parasitic capacitor C6 is a parasitic capacitor between the motor 22 and the housing 21 of the second unit 20.

[0038] Figure 2 The air conditioner 1 shown in the figure shows a case where a third unit 30 is further included, wherein power is supplied from the first unit 10 to the third unit 30. The third unit 30 includes the same structure as the second unit 20. The third unit 30 can be connected to the first unit 10 through the second connection terminal 18b, and can also be connected to the first unit 10 through a third connection terminal (not shown) that is different from the first connection terminal 18a and the second connection terminal 18b. In the case where the third unit 30 is connected to the first unit 10 through the third connection terminal, the third connection terminal is connected to the second connection terminal 18b through a connection power line and a connection ground line (not shown). In the example shown in the figure, the third unit is connected to the second connection terminal 18b through a connection power line 31 and a connection ground line 32.

[0039] The operation of the air conditioner 1 according to the first embodiment will be described.

[0040] When the operation of the air conditioner 1 starts, the noise current flows to the housing 21 through the parasitic capacitance C6 of the motor 22 as the inverter circuit 27 of the control substrate 23 is switched. A part of the noise current flowing to the housing 21 flows to the first unit 10 through the connection ground line 72. The noise current flowing to the first unit 10 returns to the inverter circuit 27 of the control substrate 23 through the first ground line 71b, the housing 11, the first ground line 71a, the noise filter 14, the first connection power line 63, and the connection power line 62. A part of the noise current generated by the switching of the inverter circuit 27 of the control substrate 23 flows through the first ground line 71b, the housing 11, the first ground line 71a, the noise filter 14, the first connection power line 63, and the connection power line 62. Figure 6 The noise path N1 shown is reversed, so the conducted noise is reduced through the noise filter 14 of the first unit 10. The reduced conducted noise is the noise terminal voltage in the second connection terminal 18b.

[0041] When the operation of the air conditioner 1 starts, the noise current flows to the housing 11 through the parasitic capacitance C1 of the motor 12 as the inverter circuit 17 of the control substrate 13 is switched. A part of the noise current flowing to the housing 11 flows to the ground E through the parasitic capacitance C2, and flows from the ground E to the connection power line 62 through the parasitic capacitance C4. The noise current flowing to the connection power line 62 returns to the inverter circuit 17 of the control substrate 13 through the second connection terminal 18b and the first connection power line 63. A part of the noise current generated by the switching of the inverter circuit 17 of the control substrate 13 flows through the second connection terminal 18b and the first connection power line 63. Figure 7 The noise path E1 shown. In addition, a part of the noise current flowing to the housing 11 flows to the ground E through the parasitic capacitor C2, and flows from the ground E to the connection ground 72 through the parasitic capacitor C3. The noise current flowing to the connection ground 72 returns to the inverter circuit 17 of the control substrate 13 through the second connection terminal 18b and the first ground 71b, the housing 11, and the first ground 71a. A part of the noise current generated by the switching of the inverter circuit 17 of the control substrate 13 passes through the noise path E2. The noise path E2 includes the motor 12, the housing 11 of the first unit 10, the ground E, the connection ground 72, the first ground 71b, the housing 11 of the first unit 10, and the first ground 71a. The noise current flowing in the noise path E1 and the noise path E2 is reduced because the magnetic field component of the noise current flowing through the magnetic body 40 provided in the first connection power line 63 and the first ground 71b is converted into heat due to the magnetic loss of the magnetic body 40.

[0042] Effects of the air conditioner 1 according to the first embodiment will be described.

[0043] Since the noise filter 14 of the first unit 10 can reduce the conducted noise generated by the operation of the second unit 20, the noise filter 24 of the second unit 20 can be simplified or eliminated. In addition, the radiation noise generated by the operation of the first unit 10 using the connection power line 62 as an antenna and the radiation noise using the connection ground line 72 as an antenna can be reduced by the magnetic body 40. Therefore, noise measures can be implemented with a simple structure.

[0044] The first connection power line 63 and the first ground line 71b pass through the hole of the magnetic body 40. The noise current from the second unit 20 that flows back between the first unit 10 and the second unit 20 flows in the first connection power line 63 and the first ground line 71b in the opposite direction. The direction of the magnetic flux generated in the magnetic body 40 due to the current flowing in the first connection power line 63 is opposite to the direction of the magnetic flux generated in the magnetic body 40 due to the current flowing in the first ground line 71b, and the magnetic fluxes cancel each other out, so the magnetic body 40 does not hinder the return flow. Therefore, the conduction noise generated by the operation of the second unit 20 can be reduced.

[0045] (Second Embodiment)

[0046] Reference Figure 3 , an air conditioner 1 of a second embodiment is described. Compared with the air conditioner 1 of the first embodiment, the air conditioner 1 of this embodiment is different in that, instead of the ground wire 72, the refrigerant pipe 80 passes through the hole of the magnetic body 40. In the following description, for convenience, the same symbols are marked on the components that have the same functions as the components of the air conditioner 1 of the first embodiment, and the description of their functions is omitted.

[0047] The noise current generated by the switching of the inverter circuit 27 of the control substrate 23 flows to the first unit 10 through the refrigerant pipe 80. The refrigerant pipe 80 passes through the hole of the magnetic body 40. The refrigerant pipe 80 after passing through is connected to the housing 11 by a conductive bonding member not shown. The noise current returns to the inverter circuit 27 of the control substrate 23 through the housing 11, the first ground line 71a, the noise filter 14, the first connection power line 63, the connection power line 62, and the second connection power line 64. The conducted noise generated from the inverter circuit 27 is reduced by the noise filter 14 of the first unit 10.

[0048] According to the air conditioner 1 of the second embodiment, the following effects can be further obtained.

[0049] The refrigerant pipe 80 functions as a connection ground wire that connects the first unit 10 and the ground E of the second unit 20. Therefore, the structure of the connection ground wire 72 can be omitted, and noise measures can be implemented with a simpler structure.

[0050] (Third Embodiment)

[0051] Reference Figure 4 , an air conditioner 1 of a third embodiment is described. Compared with the air conditioner 1 of the first embodiment or the second embodiment, the air conditioner 1 of this embodiment is different in that a protrusion 90 for connecting to the connection ground wire 72 is provided on the first unit 10. In the following description, for convenience, the same symbols are marked on the components that have the same functions as the components of the air conditioner 1 of the first embodiment or the second embodiment, and the description of their functions is omitted.

[0052] The first unit 10 includes a protrusion 90 protruding from the housing 11. The protrusion 90 includes a main body 91 and a connection terminal 92. The main body 91 is formed of a conductive material. In one example, the main body 91 is made of the same sheet metal as the housing 11. The connection terminal 92 connects the connection ground line 72 to the main body 91. The first connection power line 63 and the main body 91 pass through the hole of the magnetic body 40.

[0053] The noise current generated by the switching of the inverter circuit 27 of the control substrate 23 flows to the main body 91 through the connection ground line 72. The noise current flowing to the main body 91 returns to the inverter circuit 27 of the control substrate 23 through the housing 11, the first ground line 71a, the noise filter 14, the first connection power line 63, the connection power line 62, and the second connection power line 64. The conducted noise generated from the inverter circuit 27 is reduced by the noise filter 14 of the first unit 10.

[0054] (Variant 1)

[0055] The above-mentioned embodiments are examples of the forms that the air conditioner related to the present disclosure can adopt, and are not intended to limit the forms. The air conditioner related to the present disclosure can adopt forms different from the forms illustrated in the above-mentioned embodiments. This example is a form in which a part of the structure of the above-mentioned embodiments is replaced, changed or omitted, or a form in which a new structure is added to the above-mentioned embodiments. In the following modified examples, for the parts that are common to the forms of the above-mentioned embodiments, the same symbols as those of the above-mentioned embodiments are marked and their descriptions are omitted.

[0056] At least one of the first connection terminal 18 a and the second connection terminal 18 b may be provided at a location away from the housing 11 of the first unit 10 . Figure 5 The second connection terminal 18b is provided between the housing 11 of the first unit 10 and the housing 21 of the second unit 20. The magnetic body 40 is provided on the connection power line 62 and the connection ground line 72 or the first connection power line 63 and the first ground line 71b on the housing 11 side relative to the second connection terminal 18b.

[0057] ·exist Figure 5 In the air conditioner 1 of the described modification, the second connection terminal 18 b may be omitted.

[0058] In the first to third embodiments, the first unit 10 may be an indoor unit and the second unit 20 may be an outdoor unit.

[0059] A structure in which the connecting power line 62 , the connecting ground line 72 , and the refrigerant pipe 80 pass through the hole of the magnetic body 40 may also be adopted.

[0060] The housing 11 and the housing 21 may be partially formed of a conductive material. An example is sheet metal. The conductive portion is connected to the ground E.

[0061] As mentioned above, although embodiment of this disclosure is described, it should be understood that various changes in form and details can be made without departing from the spirit and scope of this disclosure described in the claims.

Claims

1. An air conditioner (1), the air conditioner (1) include: External power supply (50); A first unit (10), the first unit (10) being connected to the external power source (50); as well as The second unit (20), to which electric power is supplied from the first unit (10), is characterized in that: Each of the first unit (10) and the second unit (20) comprises: A shell (11, 21), wherein the shell (11, 21) is connected to the ground (E) and is made of a conductive material; a motor (12, 22), wherein the motor (12, 22) is accommodated in the housing (11, 21); and a control substrate (13, 23), wherein the control substrate (13, 23) is used to supply electric power to the motor (12, 22), The first unit (10) comprises a connection terminal (18), and the connection terminal (18) is used to connect the power lines inside and outside the housing (11) to the ground line. The control substrate (13) of the first unit (10) and the control substrate (23) of the second unit (20) are connected via a connecting power line (62) and a connecting ground line (72), wherein the connecting power line (62) supplies power from the first unit (10) to the second unit (20), and the connecting ground line (72) connects the ground (E) of the first unit (10) and the second unit (20), The connection terminal (18) includes a connection terminal (18b) for connecting the connection power line (62) and the connection ground line (72) to the housing (11). The first unit (10) comprises a capacitor (14a) connected between the connecting power line (62) and the ground (E) of the first unit (10), The connecting power line (62) and the connecting ground line (72) pass through the hole of the magnetic body (40). The magnetic body (40) is configured in such a manner that when a current flows from one of the first unit (10) and the second unit (20) to the other in the connecting power line (62) and the connecting ground line (72), the direction of the magnetic flux generated in the magnetic body (40) due to the current flowing in the connecting power line (62) is the same as the direction of the magnetic flux generated in the magnetic body (40) due to the current flowing in the connecting ground line (72), The first unit (10) and the second unit (20) respectively include a rectifier circuit (15, 25) and an inverter circuit (17, 27), The air conditioner is formed with a plurality of parasitic capacitors (C1, C2, C3, C4, C5, C6), and the plurality of parasitic capacitors (C1, C2, C3, C4, C5, C6) include: a parasitic capacitor (C1) between a housing (11) of the first unit (10) and a motor (12) of the first unit (10); a parasitic capacitance (C2) between the housing (11) of the first unit (10) and the ground (E); a parasitic capacitance (C3) between the ground (E) and the connecting ground line (72); and A parasitic capacitor (C4) is located between the ground (E) and the connecting power line (62).

2. The air conditioner according to claim 1, It is characterized in that It also includes a third unit (30) powered by the first unit (10), The first unit (10) further comprises a connection terminal (18) for connecting the second unit (20) and the third unit (30) to the first unit (10). The magnetic body (40) is disposed between the connection terminal (18) and the capacitor (14a).

3. The air conditioner according to claim 1 or 2, It is characterized in that The connection ground line (72) is a refrigerant pipe (80) for circulating the refrigerant between the first unit (10) and the second unit (20).

4. An air conditioner (1), the air conditioner (1) include: External power supply (50); A first unit (10), the first unit (10) being connected to the external power source (50); as well as The second unit (20), to which electric power is supplied from the first unit (10), is characterized in that: Each of the first unit (10) and the second unit (20) comprises: A shell (11, 21), wherein the shell (11, 21) is connected to the ground (E) and is made of a conductive material; a motor (12, 22), wherein the motor (12, 22) is accommodated in the housing (11, 21); and a control substrate (13, 23), wherein the control substrate (13, 23) is used to supply electric power to the motor (12, 22), The first unit (10) comprises: A connecting terminal (18), the connecting terminal (18) being used to connect the power lines inside and outside the housing (11) to a ground line; and a protrusion (90), the protrusion (90) protruding from the housing (11) and having conductivity, The control substrate (13) of the first unit (10) includes a capacitor (14a) connected between the connecting power line (62) and the ground (E), The control substrate (13) of the first unit (10) and the control substrate (23) of the second unit (20) are connected via a connecting power line (62) and a connecting ground line (72), wherein the connecting power line (62) supplies power from the first unit (10) to the second unit (20), and the connecting ground line (72) connects the ground (E) of the first unit (10) and the second unit (20), The connection terminal (18) includes a connection terminal (18b) for connecting the connection power line (62) to the housing (11). The protrusion (90) is connected to the connecting ground line (72), The connecting power line (62) and the protrusion (90) pass through the hole of the magnetic body (40). The magnetic body (40) is configured in such a manner that when a current flows from one of the first unit (10) and the second unit (20) to the other in the connecting power line (62) and the connecting ground line (72), the direction of the magnetic flux generated in the magnetic body (40) due to the current flowing in the connecting power line (62) is the same as the direction of the magnetic flux generated in the magnetic body (40) due to the current flowing in the connecting ground line (72), The first unit (10) and the second unit (20) respectively include a rectifier circuit (15, 25) and an inverter circuit (17, 27), The air conditioner is formed with a plurality of parasitic capacitors (C1, C2, C3, C4, C5, C6), and the plurality of parasitic capacitors (C1, C2, C3, C4, C5, C6) include: a parasitic capacitor (C1) between a housing (11) of the first unit (10) and a motor (12) of the first unit (10); a parasitic capacitance (C2) between the housing (11) of the first unit (10) and the ground (E); a parasitic capacitance (C3) between the ground (E) and the connecting ground line (72); and A parasitic capacitor (C4) is located between the ground (E) and the connecting power line (62).

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