Power conversion device and air conditioner

Abstract

To provide a technology capable of more appropriately suppressing common mode noise.SOLUTION: A power conversion device 200 according to an embodiment of the present disclosure includes a noise filter 220 including a common mode choke coil 221. The common mode choke coil 221 includes an annular magnetic core 10 formed of a magnetic material, an annular core case 20 that houses the magnetic core 10, a multi-phase winding 40 in which electric wires are wound around the magnetic core 10 from above the core case 20 so as to form overlapping layers, a partition portion 30 that is insulating and divides the space inside the inner circumference of the core case 20 into spaces for each phase of the winding 40, and a protrusion member 70 that is insulating and separates a winding portion 41 corresponding to the first turn from one end of the winding 40 from a winding portion 42 corresponding to the first turn from the other end of the winding 40 in each of the spaces for one phase of the winding 40 divided by the partition portion 30.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a power conversion device and the like. [Background technology]

[0002] For example, a common mode choke coil for suppressing common mode noise is known (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-082758 Summary of the Invention [Problem to be solved by the invention]

[0004] In a common mode choke coil used in a power converter with a relatively large current, for example, a wire with a relatively large cross-sectional area is used for the winding, and the number of turns may be relatively large to increase the impedance in the kHz (kilohertz) band. In this case, the space factor of the winding increases, and the inter-line capacitance for each winding portion corresponding to one turn of the winding increases, which may result in a decrease in impedance in the MHz (megahertz) band. In addition, the increase in the inter-line capacitance may decrease the resonance frequency, and a self-resonant frequency may appear in the frequency band of 100 MHz or less, causing a decrease in impedance due to resonance in the MHz band. Therefore, it may not be possible to adequately suppress common mode noise in the MHz band.

[0005] An object of the present disclosure is to provide a technique capable of more appropriately suppressing common-mode noise. [Means for solving the problem]

[0006] In a first aspect of the present disclosure, A noise filter including a choke coil is provided. The choke coil is An annular member formed of a magnetic material; an annular case portion that houses the annular member; a plurality of phase windings wound around the annular member from above the case portion in overlapping layers; a first member having insulating properties and dividing a space inside an inner periphery of the case portion into spaces for each phase of the winding; and a second member having insulating properties, which maintains a distance between a first winding portion corresponding to a first turn from one end of the winding and a second winding portion corresponding to a first turn from the other end of the winding in each of the spaces for one phase so that the distance is relatively large with respect to a predetermined standard. A power converter is provided.

[0007] According to this aspect, for each of the multiple phases of the choke coil, a relatively large interval can be secured between the first winding portion of the first turn at one end of the winding and the second winding portion of the first turn at the other end of the winding. Therefore, the line capacitance between the first winding portion and the second winding portion can be reduced. Therefore, the power conversion device can more appropriately suppress common mode noise by the noise filter including the choke coil.

[0008] In addition, in a second aspect of the present disclosure, based on the first aspect described above, When a distance corresponding to the interval is d, a diameter of the electric wire of the winding is φ, and a height of the case portion is h, the interval may satisfy the following formula.

[0009]

number

[0010] In addition, in a third aspect of the present disclosure, on the premise of the first or second aspect described above, In each of the spaces for one phase, there may be another winding part different from the first winding part between the first winding part and the case part, or there may be another winding part different from the second winding part between the second winding part and the case part.

[0011] In addition, in a fourth aspect of the present disclosure, based on the above-mentioned third aspect, In each of the spaces for one phase, there may be another winding part different from the first winding part between the first winding part and the case part, and there may be another winding part different from the second winding part between the second winding part and the case part.

[0012] In addition, in a fifth aspect of the present disclosure, on the premise of any one of the first to fourth aspects described above, The second member may be formed from the same material as the case portion or the first member.

[0013] In addition, in a sixth aspect of the present disclosure, on the premise of any one of the first to fifth aspects described above, The switching device may be operated at a switching frequency of 20 kHz or more.

[0014] In addition, in a seventh aspect of the present disclosure, on the premise of any one of the first to sixth aspects described above, The cross-sectional area of ​​the winding for each of the multiple phases is 1.75 mm 2 It may be more than that.

[0015] In addition, in an eighth aspect of the present disclosure, a power conversion device according to any one of the first to seventh aspects is provided. An air conditioner is provided. Effect of the Invention

[0016] According to the above-described embodiment, common mode noise can be more appropriately suppressed. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a diagram illustrating an example of a refrigerant circuit of an air conditioner. [Diagram 2] FIG. 1 is a diagram illustrating a configuration of an example of a power conversion device. [Diagram 3] 1 is a diagram showing a configuration of a first example of a common mode choke coil. [Figure 4] 1 is a diagram showing a configuration of a first example of a common mode choke coil. [Diagram 5] 1 is a diagram showing an equivalent circuit of a common mode choke coil expressed as a distributed constant circuit. [Figure 6] 1 is a diagram showing frequency characteristics of impedance of a common mode choke coil according to an embodiment and a common mode choke coil according to a comparative example. FIG. [Figure 7] FIG. 13 is a diagram illustrating a configuration of a second example of a common mode choke coil. [Figure 8] FIG. 13 is a diagram illustrating a configuration of a second example of a common mode choke coil. [Figure 9] FIG. 13 is a diagram illustrating a configuration of a third example of a common mode choke coil. [Figure 10] FIG. 13 is a diagram illustrating a configuration of a third example of a common mode choke coil. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment will be described with reference to the drawings.

[0019] [Air conditioner overview] An overview of an air conditioner 100 according to this embodiment will be described with reference to FIG.

[0020] FIG. 1 is a diagram showing an example of a refrigerant circuit of an air conditioner 100. As shown in FIG.

[0021] 1, the air conditioner 100 includes an outdoor unit 110, an indoor unit 120, and refrigerant paths 130 and 140. The air conditioner 100 operates a refrigeration cycle made up of the outdoor unit 110, the indoor unit 120, and the refrigerant paths 130 and 140, and adjusts the temperature, humidity, and the like in a room in which the indoor unit 120 is installed.

[0022] The outdoor unit 110 is disposed outside a building whose temperature and the like are to be adjusted. The outdoor unit 110 is connected to one end of each of the refrigerant paths 130, 140, and draws in the refrigerant from one of the refrigerant paths 130, 140 and discharges the refrigerant to the other.

[0023] The indoor unit 120 is placed in a room of a building where the temperature, etc., is to be adjusted. The indoor unit 120 is connected to the other end of each of the refrigerant paths 130, 140, draws in refrigerant from one of the refrigerant paths 130, 140, and discharges the refrigerant to the other.

[0024] The refrigerant paths 130, 140 are, for example, configured by pipes, and connect the outdoor unit 110 and the indoor unit 120 so that the refrigerant can circulate between the outdoor unit 110 and the indoor unit 120.

[0025] The outdoor unit 110 includes refrigerant paths L1 to L6, oil paths L7 and L8, a four-way switching valve 111, an accumulator 112, a compressor 113, an oil separator 114, an outdoor heat exchanger 115, an outdoor expansion valve 116, and a fan 117.

[0026] The refrigerant paths L1 to L6 are configured as pipes, for example.

[0027] The refrigerant path L1 connects one end of the refrigerant path 130 outside the outdoor unit 110 to the four-way switching valve 111.

[0028] The refrigerant path L2 connects between the four-way switching valve 111 and the inlet of the compressor 113. The refrigerant path L2 includes refrigerant paths L21 and L22.

[0029] The refrigerant path L21 connects between the four-way switching valve 111 and the accumulator 112. The refrigerant path L22 connects between the accumulator 112 and the inlet of the compressor 113.

[0030] The refrigerant path L3 connects between the four-way switching valve 111 and the outlet of the compressor 113. The refrigerant path L3 includes refrigerant paths L31 and L32.

[0031] The refrigerant path L31 connects between the outlet of the compressor 113 and the oil separator 114. The refrigerant path L32 connects between the four-way switching valve 111 and the oil separator 114.

[0032] The refrigerant path L4 connects the four-way switching valve 111 and the outdoor heat exchanger 115.

[0033] The refrigerant path L5 connects the outdoor heat exchanger 115 and the outdoor expansion valve 116.

[0034] The refrigerant path L6 connects one end of the refrigerant path 140 outside the outdoor unit 110 and the outdoor expansion valve .

[0035] The oil path L7 is configured as, for example, a pipe, and is used to cause the oil separated by the oil separator 114 to flow into the refrigerant path L22 and return the oil to the compressor 113 through the refrigerant path L22.

[0036] In addition, for example, a liquid-phase refrigerant (hereinafter, "liquid refrigerant") may be dissolved in the oil passing through the oil path L7. That is, not only oil but also liquid refrigerant flows through the oil path L7.

[0037] The oil path L8 is configured as, for example, a pipe, and is used to allow the oil containing the liquid refrigerant separated by the accumulator 112 to flow into the refrigerant path L22 and to return the oil to the compressor 113 through the refrigerant path L22.

[0038] The four-way switching valve 111 reverses the flow of circulating refrigerant between when the air conditioner 100 is in cooling operation and when it is in heating operation.

[0039] During cooling operation of the air conditioner 100, the four-way switching valve 111 connects the paths indicated by solid lines in Fig. 1. Specifically, during cooling operation of the air conditioner 100, the four-way switching valve 111 connects between the refrigerant path L1 and the refrigerant path L2, and between the refrigerant path L3 and the refrigerant path L4.

[0040] On the other hand, when the air conditioner 100 is in heating operation, the four-way switching valve 111 connects the paths indicated by the dotted lines in Fig. 1. Specifically, when the air conditioner 100 is in heating operation, the four-way switching valve 111 connects between the refrigerant path L4 and the refrigerant path L2, and between the refrigerant path L1 and the refrigerant path L3.

[0041] The accumulator 112 separates liquid refrigerant contained in the refrigerant drawn from the refrigerant path L21, and discharges the refrigerant from which a part or all of the liquid refrigerant has been removed to the refrigerant path L22. The liquid refrigerant separated in the accumulator 112 contains oil. The accumulator 112 is provided with an oil discharge port connected to the oil path L8, and the separated oil containing the refrigerant flows out into the oil path L8 through the oil discharge port and is returned to the compressor 113 through the oil path L8 and the refrigerant path L22.

[0042] The compressor 113 draws in the refrigerant from the refrigerant path L22, compresses it to a high pressure, and discharges it to the refrigerant path L31.

[0043] During cooling operation of the air conditioner 100, high-temperature, high-pressure refrigerant compressed by the compressor 113 flows into the outdoor heat exchanger 115 through refrigerant paths L3 and L4.

[0044] On the other hand, during heating operation of the air conditioner 100, the high-temperature, high-pressure refrigerant compressed by the compressor 113 flows through the refrigerant path L3 and the refrigerant path L1 into the refrigerant path 130 outside the outdoor unit 110. Then, the high-temperature, high-pressure refrigerant flows into the indoor unit 120 through the refrigerant path 130.

[0045] The oil separator 114 separates oil from the refrigerant flowing in from the refrigerant path L31, and causes the refrigerant from which a part or all of the oil has been separated and removed to flow into the refrigerant path L32. The oil separator 114 is also provided with an oil outlet connected to the oil path L7, and the oil separated from the refrigerant flows into the oil path L7 through the oil outlet and is returned to the compressor 113 through the oil path L7 and the refrigerant path L22.

[0046] The outdoor heat exchanger 115 exchanges heat between the outside air and the refrigerant passing through the inside. Specifically, the outdoor heat exchanger 115 is provided with a fan 117, and the outdoor heat exchanger 115 exchanges heat between the outside air blown by the fan 117 and the refrigerant flowing through the inside.

[0047] When the air conditioner 100 is in cooling operation, the outdoor heat exchanger 115 causes the high-temperature, high-pressure refrigerant compressed by the compressor 113 and flowing in from the refrigerant path L4 to dissipate heat to the outside air, and causes the condensed and liquefied refrigerant (liquid refrigerant) to flow into the refrigerant path L5.

[0048] Furthermore, during heating operation of the air conditioner 100, the outdoor heat exchanger 115 causes the low-temperature, low-pressure liquid refrigerant flowing in from the refrigerant path L5 to absorb heat from the outside air, and causes the evaporated refrigerant to flow into the refrigerant path L4.

[0049] The outdoor expansion valve 116 is closed to a predetermined opening degree during heating operation of the air conditioner 100, and reduces the pressure of the refrigerant (liquid refrigerant) flowing in from the refrigerant path L6 to a predetermined pressure. On the other hand, the outdoor expansion valve 116 is fully open during cooling operation of the air conditioner 100, and passes the refrigerant (liquid refrigerant) from the refrigerant path L5 to the refrigerant path L6. The outdoor expansion valve 116 is, for example, a solenoid valve.

[0050] The indoor unit 120 includes an indoor expansion valve 121 , an indoor heat exchanger 122 , and a fan 123 .

[0051] The indoor expansion valve 121 is closed to a predetermined opening degree during cooling operation of the air conditioner 100, and reduces the pressure of the supercooled liquid refrigerant flowing in from the refrigerant path 140 to a predetermined pressure. On the other hand, during heating operation of the air conditioner 100, the indoor expansion valve 121 is fully open, and allows the refrigerant (liquid refrigerant) flowing out from the indoor heat exchanger 122 to pass toward the refrigerant path 140. The indoor expansion valve 121 is, for example, a solenoid valve.

[0052] The indoor heat exchanger 122 exchanges heat between the indoor air and the refrigerant passing through it. Specifically, the indoor air passes around the indoor heat exchanger 122 by the action of the fan 123 mounted in the indoor unit 120, promoting heat exchange with the refrigerant inside the indoor heat exchanger 122. Then, the indoor air that has exchanged heat with the refrigerant inside the indoor heat exchanger 122 is sent out of the indoor unit 120 by the action of the fan 123, thereby realizing cooling or heating of the room.

[0053] When the air conditioner 100 is in cooling operation, the indoor heat exchanger 122 causes the low-temperature, low-pressure liquid refrigerant decompressed by the indoor expansion valve 121 to absorb heat from the indoor air, thereby lowering the temperature of the indoor air.

[0054] On the other hand, during heating operation of the air conditioner 100, the indoor heat exchanger 122 causes the high-temperature, high-pressure refrigerant flowing in from the outdoor unit 110 through the refrigerant path 130 to radiate heat to the indoor air, thereby raising the temperature of the indoor air.

[0055] [Power conversion device configuration] Next, the configuration of the power conversion device 200 mounted on the air conditioner 100 according to this embodiment will be described with reference to FIG.

[0056] FIG. 2 is a diagram illustrating an example of a configuration of the power conversion device 200. As shown in FIG.

[0057] As shown in FIG. 2, the outdoor unit 110 has a housing 110H that houses its components, and includes a power converter 200 housed in the housing 110H.

[0058] The power conversion device 200 drives the electric motor 113M of the compressor 113 using three-phase AC power of a commercial power source PS, which is supplied from outside the outdoor unit 110.

[0059] The power conversion device 200 includes a terminal T_FG, a power supply line L_R, a power supply line L_S, a power supply line L_T, a power supply terminal block 210, a noise filter 220, an inverter 230, and a heat dissipation unit 240.

[0060] Terminal T_FG is provided in housing 110H and is grounded outside housing 110H, so that housing 110H is regarded as a reference potential part equivalent to ground.

[0061] The power supply lines L_R, L_S, and L_T supply three-phase AC from the commercial power supply PS to the inverter 230.

[0062] The power supply line L_R supplies R-phase AC from the commercial power supply PS to the inverter 230. The power supply line L_R includes power supply lines L_R1 to L_R5.

[0063] The power supply lines L_S supply S-phase AC current of the commercial power supply PS to the inverter 230. The power supply lines L_S include power supply lines L_S1 to L_S5.

[0064] The power supply line L_T supplies T-phase AC from the commercial power supply PS to the inverter 230. The power supply line L_T includes power supply lines L_T1 to L_T5.

[0065] The power lines L_R1, L_S1, and L_T1 respectively connect the commercial power source PS and the power terminal block 210. The power lines L_R2, L_S2, and L_T2 respectively connect the power terminal block 210 and one end of the power lines L_R3, L_S3, and L_T3 of the noise filter 220. The power lines L_R3, L_S3, and L_T3 and the power lines L_R4, L_S4, and L_T4 correspond to the power lines inside the noise filter 220. For example, the power lines L_R3, L_S3, and L_T3 and the power lines L_R4, L_S4, and L_T4 are implemented as wiring patterns on a board on which the noise filter is implemented. The power lines L_R5, L_S5, and L_T5 respectively connect the other ends of the power lines L_R4, L_S4, and L_T4 of the noise filter 220 and the inverter 230.

[0066] The power terminal block 210 relays and branches the three-phase AC supplied by the power lines L_R1, L_S1, and L_T1 to various devices.

[0067] One end of the power line L_R1 and one end of the power line L_R2 are connected to the power terminal block 210, electrically connecting the power lines L_R1 and L_R2. Similarly, one end of the power line L_S1 and one end of the power line L_S2 are connected to the power terminal block 210, electrically connecting the power lines L_S1 and L_S2. Similarly, one end of the power line L_T1 and one end of the power line L_T2 are connected to the power terminal block 210, electrically connecting the power lines L_T1 and L_T2.

[0068] The noise filter 220 suppresses noise in the current of the power conversion device 200. For example, as shown in Fig. 2, the noise filter 220 includes a common mode choke coil 221 and a Y capacitor 222, and these components are mounted on a predetermined board.

[0069] The common mode choke coil 221 acts as an inductor with respect to a common mode noise current (common mode current) flowing through the power lines L_R3, L_S3, and L_T3 and the power lines L_R4, L_S4, and L_T4, and suppresses the noise current.

[0070] The Y capacitor 222 has a function of returning the common mode current that has flowed out to the ground to the noise source (the inverter 230). The Y capacitor 222 includes Y capacitors 222R, 222S, and 222T.

[0071] The Y capacitor 222R is provided in a bypass path connecting the power line L_R4 and the housing 110H corresponding to the ground. The Y capacitor 222S is provided in a bypass path connecting the power line L_S4 and the housing 110H corresponding to the ground. The Y capacitor 222T is provided in a bypass path connecting the power line L_T4 and the housing 110H corresponding to the ground.

[0072] The inverter 230 generates a three-phase AC of a predetermined voltage and frequency using the three-phase AC supplied through the power lines L_R, L_S, and L_T, and outputs the three-phase AC to the motor 113M. This allows the power conversion device 200 to drive the compressor 113. The inverter 230 may be mounted on a board separate from the board on which the noise filter 220 is mounted, or may be mounted on a different board. The inverter 230 includes a rectifier circuit 231, a smoothing circuit 232, and an inverter circuit 233.

[0073] The rectifier circuit 231 converts the three-phase AC of the power supply lines L_R5, L_S5, and L_T5 into DC and outputs it to the power supply lines L_P1 and L_N1. For example, as shown in Fig. 2, the rectifier circuit 231 includes a power device 231PD. The power device 231PD is a rectifier diode made of a semiconductor.

[0074] The smoothing circuit 232 smoothes the direct current of the power supply lines L_P1 and L_N1. For example, the smoothing circuit 232 includes a smoothing capacitor 232C and a reactor 232L.

[0075] The smoothing capacitor 232C is provided in a path connecting the power supply lines L_P1 and L_N1. The smoothing capacitor 232C smoothes the direct current output from the rectifier circuit 231 and the direct current output (regenerated) from the inverter circuit 233 while repeatedly charging and discharging as appropriate.

[0076] The reactor 232L is provided on the power supply line L_P1. For example, the reactor 232L is provided on the power supply line L_P1 between the rectifier circuit 231 and the smoothing capacitor 232C. The reactor 232L smoothes the direct current output from the rectifier circuit 231 and the direct current output (regenerated) from the inverter circuit 233 while generating a voltage so as to appropriately prevent a change in current.

[0077] The inverter circuit 233 is connected to the other end of the power supply lines L_P1, L_N1. The inverter circuit 233 includes a power device 233PD. The power device 233PD is, for example, a semiconductor switch. The semiconductor switch is, for example, an insulated gate bipolar transistor (IGBT), a metal-oxide-semiconductor field-effect transistor (MOSFET), a high electron mobility transistor (HEMT), or the like. The semiconductor switch is, for example, mainly made of silicon (Si). The semiconductor switch may also be mainly made of a wide band gap semiconductor material. The power device 233PD may also include, in addition to the semiconductor switch, a freewheel diode made of a semiconductor connected in parallel with the semiconductor switch.

[0078] The inverter circuit 233 converts the direct current output from the smoothing circuit 232 into a three-phase alternating current (i.e., U-phase, V-phase, and W-phase alternating current) having a predetermined frequency and a predetermined voltage by the switching operation of the power device 233PD, and outputs the converted current to the electric motor 113M. The power device 233PD may have a relatively high switching speed. For example, the switching speed of the power device 233PD (i.e., the time required for switching) is 10 nanoseconds or less. The switching frequency of the power device 233PD is set to, for example, 20 kHz or more. This makes it possible to remove the frequency of noise caused by the switching operation of the power device 233PD from the human audible range.

[0079] The heat dissipation section 240 dissipates the heat of the power device 233PD to the outside of the power device 233PD.

[0080] For example, the heat dissipation unit 240 is a heat sink and is connected to the housing 110H. The power device 233PD and the heat dissipation unit 240 (heat sink) are thermally coupled to each other so as to enable thermal conduction.

[0081] The power device 233PD and the heat dissipation section 240 (heat sink) are in indirect contact with each other, for example, via a heat dissipation promotion member that is an insulator, so that heat conduction is possible. The heat dissipation promotion member is, for example, a heat conductive sheet containing a heat conductive filler, heat conductive grease, etc. Also, the power device 233PD and the heat dissipation section 240 (heat sink) may be in direct contact with each other, so that heat conduction is possible.

[0082] Moreover, the heat dissipation section 240 may be a water jacket or the like through which a refrigerant flows.

[0083] [Example 1 of a common mode choke coil] Next, a first example of the common mode choke coil 221 will be described with reference to FIGS.

[0084] <Configuration> 3 and 4 are diagrams showing the configuration of a first example of the common mode choke coil 221. In FIG.

[0085] The arrangement of the lead wires 50, 60 corresponding to the three-phase windings 40 is the same. Therefore, in FIG. 3, only the lead wires 50, 60 corresponding to a specific one-phase winding 40 among the three-phase windings 40 are drawn, and the lead wires 50, 60 corresponding to the other two-phase windings 40 are omitted. The winding structure of the electric wires of the three-phase windings 40 is the same. Therefore, in FIG. 4, the illustration of the two-phase windings 40 among the three-phase windings 40 drawn in FIG. 3 is omitted, and only the cross section of the remaining one-phase winding 40 in the space on the inner circumferential side of the core case 20 (i.e., the space radially inward from the core case 20) is drawn. In FIG. 4, the arrows shown together with the cross section of the winding 40 indicate an example of how to wind the winding 40. The same drawing format of the common mode choke coil 221 as in FIG. 3 and FIG. 4 is adopted for FIG. 7, FIG. 8, FIG. 9, and FIG. 10 described later.

[0086] As shown in FIGS. 3 and 4, the common mode choke coil 221 includes a magnetic core 10, a core case 20, a partition portion 30, a winding 40, lead wires 50 and 60, and a protruding member 70.

[0087] The magnetic core 10 is made of a magnetic body (magnetic material). The magnetic body is, for example, ferrite or carbonyl iron. The magnetic core 10 is a so-called toroidal core, and has a circular ring shape when viewed along the axial direction (the direction perpendicular to the plane on which Figs. 3 and 4 are drawn), and is formed in a doughnut shape having a predetermined width in the axial direction.

[0088] The core case 20 accommodates the magnetic core 10 in its internal hollow portion. When viewed along the axial direction, the core case 20 has a circular ring shape like the magnetic core 10, and is formed into a doughnut shape with a predetermined width in the axial direction, and is formed so that the shape of the hollow portion is the same as or slightly larger than that of the magnetic core 10. The core case 20 is formed from an insulator (insulating material) and ensures insulation between the magnetic core 10 and the winding 40. The insulator is, for example, a synthetic resin (plastic).

[0089] The partition section 30 is formed of an insulator and divides the space on the inner circumferential side of the core case 20 into spaces for the windings 40 of three phases (R phase, S phase, and T phase). As a result, the partition section 30 can ensure insulation between the windings 40 adjacent to each other in the circumferential direction of the core case 20. The partition section 30 may be formed of the same type of insulator as the core case 20, or may be formed of a different type of insulator. The partition section 30 includes three partition plates 31. The three partition plates 31 are arranged at intervals of 120 degrees in the circumferential direction of the inner circumferential surface of the core case 20, extend radially from the inner circumferential surface of the core case 20 toward the central axis of the core case 20, and are connected to gather at the central axis of the core case 20. As a result, the partition section 30 can divide the space on the inner circumferential side of the core case 20 into three fan-shaped spaces with a central angle of 120 degrees when viewed along the axial direction. The partition portion 30 may be molded integrally with the core case 20, or may be molded separately and then connected thereto by a known method.

[0090] The windings 40 are configured in such a manner that the electric wire is wound around the magnetic core 10 from above the core case 20. The electric wire used for the windings 40 is, for example, a copper wire such as an enameled wire. Specifically, the three-phase windings 40 are configured in such a manner that they are wound around a circumferential range of the core case 20 adjacent to a space corresponding to a target phase partitioned by the partition portion 30 on the inner circumferential side of the core case 20. As a result, the three-phase windings 40 are arranged at approximately equal intervals in three positions in the circumferential direction of the core case 20 such that the windings 40 adjacent in the circumferential direction are separated from each other at the angular positions where the three partition plates 31 are arranged. The specifications of the windings 40 of each phase are all approximately the same. The word "approximately" is intended to allow for manufacturing errors and the like.

[0091] In this example, the windings 40 of each phase may be formed of wires having a relatively large cross-sectional area. This is because the amount of current required in the power conversion device 200 is relatively large. For example, the cross-sectional area of ​​the wire of the windings 40 of each phase may be 1.75 mm 2 That's all.

[0092] In this example, the number of turns of the winding 40 for each phase may be relatively large. This can increase the impedance in the kHz band of the common mode choke coil 221. For example, as shown in FIG. 4, the number of turns of the winding 40 for each phase is 12.

[0093] When the cross-sectional area of ​​the electric wire of the winding 40 is relatively large or when the number of turns of the winding 40 is relatively large, the space factor of the winding 40 may become relatively large in the space corresponding to each phase partitioned by the partition portion 30 on the inner circumferential side of the core case 20. For this reason, for example, as shown in Fig. 4, the winding 40 of each phase is wound in the space corresponding to each phase on the inner circumferential side of the core case 20 such that the electric wire overlaps with another to form multiple layers (three layers in this example).

[0094] 4, for example, starting from a position approximately halfway along the length of the electric wire corresponding to winding 40, one end side and the other end side of the electric wire are wound in opposite directions in the circumferential direction of core case 20. During this process, if the inner circumferential surface of core case 20 is covered with the electric wire and there is no area on the surface of core case 20 where the electric wire is to be wound, the electric wire is wound so as to overlap the electric wire already wound around core case 20. Then, the winding of the electric wire ends at a point closer to the center of the space radially inward than the inner circumferential surface of core case 20, and lead wires 50, 60 are drawn out from that point.

[0095] The lead wire 50 is connected to one end of the electric wire of the winding 40 of each phase, and electrically connects the winding 40 to the commercial power supply PS. For example, the end of the lead wire 50 corresponding to the R-phase winding 40, as viewed from the winding 40, is connected to the power supply line L_R3. Similarly, the end of the lead wire 50 corresponding to the S-phase winding 40, as viewed from the winding 40, is connected to the power supply line L_S3. Similarly, the end of the lead wire 50 corresponding to the T-phase winding 40, as viewed from the winding 40, is connected to the power supply line L_T3.

[0096] The lead wire 60 is connected to the other end of the electric wire of the winding 40 of each phase, and electrically connects the winding 40 to the inverter 230. For example, the end of the lead wire 60 corresponding to the R-phase winding 40, as viewed from the winding 40, is connected to the power supply line L_R4. Similarly, the end of the lead wire 60 corresponding to the S-phase winding 40, as viewed from the winding 40, is connected to the power supply line L_S4. Similarly, the end of the lead wire 60 corresponding to the T-phase winding 40, as viewed from the winding 40, is connected to the power supply line L_T4.

[0097] The protruding members 70 are formed of an insulator, and are provided in the space on the inner circumferential side of the core case 20 so as to protrude radially outward from the connection portion of the three partition plates 31 corresponding to the central axis of the core case 20 for each space corresponding to the three-phase winding 40. The protruding members 70 may be formed of the same type of insulator as the core case 20 and the partition portion 30, or may be formed of a different type of insulator. The protruding members 70 may be molded integrally with the partition portion 30, or may be molded separately from the partition portion 30 and connected by a known method. The protruding members 70 are disposed between the winding portion 41 corresponding to one turn at one end of the winding 40 and the winding portion 42 corresponding to one turn at the other end of the winding 40 in each of the three spaces partitioned by the partition portion 30 on the inner circumferential side of the core case 20. This allows the spacing between the winding portions 41 and 42 and the spacing between the lead wires 50 and 60 connected to the winding portion 41 and the winding portion 42 to be secured to a certain degree. This makes it possible to make relatively small the line capacitance (stray capacitance) between the winding portions 41, 42 and the line capacitance (stray capacitance) between the lead wires 50, 60. For example, as shown in Figures 3 and 4, the protruding member 70 is provided so as to protrude in an angular direction that equally divides the central angle of 120 degrees defined by two adjacent partition plates 31 when viewed along the axial direction.

[0098] <Impedance frequency characteristics of common mode choke coil> Fig. 5 is a diagram showing an equivalent circuit of common mode choke coil 221 expressed as a distributed constant circuit. Fig. 6 is a diagram showing frequency characteristics of impedance of common mode choke coil 221 according to the example and a common mode choke coil according to the comparative example.

[0099] The common mode choke coil according to the comparative example differs from the common mode choke coil 221 according to the embodiment (FIGS. 3 and 4) in that it does not include a protruding member 70, but is otherwise the same as the common mode choke coil 221 according to the embodiment.

[0100] 5, one turn of the winding 40 of the common mode choke coil 221 and the lead wires 50, 60 can be represented as a series connection of a resistance and an inductance. For example, the lead wire 50 is represented as a series connection of a resistance Rx1 and an inductance Lx1, and the lead wire 60 is represented as a series connection of a resistance Rx2 and an inductance Lx2. Similarly, the winding portion 41 at one end of the winding 40 is represented as a series connection of a resistance R_1 and an inductance L_1, and the winding portion 42 at the other end of the winding 40 is represented as a series connection of a resistance R_2 and an inductance L_2.

[0101] 5, there is capacitive coupling between the turns of winding 40, and the state of the coupling can be expressed as capacitance (stray capacitance). For example, the capacitive coupling state between lead wires 50 and 60 is expressed as stray capacitance C0, and the capacitive coupling state between windings 41 and 42 is expressed as stray capacitance C1.

[0102] For example, as shown in Figures 3 and 4, in the space inner than core case 20, if the wires of winding 40 overlap to form multiple layers and winding portions 41, 42 are positioned near the radial center, there is a possibility that winding portions 41, 42 of winding 40 will become very close to each other.

[0103] In this case, in the common mode choke coil according to the comparative example, since the protruding member 70 is not present, the stray capacitance C0 between the lead wires 50 and 60 and the stray capacitance C1 between the winding parts 41 and 42 become relatively large. Therefore, in the common mode choke coil according to the comparative example, the resonant frequency of the series resonance of the path corresponding to the paths RT0 and RT1 in FIG. 5 becomes relatively low. As a result, as shown in FIG. 6, in the common mode choke coil according to the comparative example, the impedance may be significantly reduced in the frequency band of 10 MHz or more due to the resonance appearing in the frequency band of several tens of MHz. Therefore, the common mode choke coil according to the comparative example may not be able to sufficiently suppress the common mode noise in the high frequency band of 10 MHz or more.

[0104] In particular, as described above, when the switching frequency of the inverter 230 is 20 kHz or more, the noise level in the high frequency band of 10 MHz or more becomes relatively high. Therefore, the common mode choke coil according to the comparative example may not be able to sufficiently suppress the common mode noise caused by the inverter 230, which has a switching frequency of 20 kHz or more as a noise source.

[0105] In contrast, in the common mode choke coil 221 according to the embodiment (first example), the protruding member 70 separates the winding parts 41 and 42, and the distance between the winding parts 41 and 42 can be secured to a certain degree. Therefore, in the common mode choke coil 221 according to the embodiment, the resonance frequency of the series resonance of the paths RT0 and RT1 in FIG. 5 can be made relatively high. As a result, as shown in FIG. 6, the common mode choke coil 221 according to the embodiment can suppress the decrease in impedance in a frequency band of 10 MHz or more. Therefore, the common mode choke coil 221 according to the embodiment can more appropriately suppress the common mode noise in a high frequency band of 10 MHz or more caused by the inverter 230 having a switching frequency of 20 kHz or more as a noise source.

[0106] <Conditions for the distance between the windings at one end and the other end of the winding> As described above, the higher the resonant frequency of common mode choke coil 221, the more the impedance drop in the high frequency band of 10 MHz or more can be suppressed, and the more the common mode noise removal characteristics in the high frequency band of 10 MHz or more can be improved. Therefore, it is desirable to maintain the interval (distance) d between winding parts 41, 42 so as to be relatively large with respect to a predetermined standard. The interval d being relatively large with respect to the predetermined standard may mean that the interval d is equal to or larger than the predetermined standard, or may mean that the interval d is larger than the predetermined standard. The predetermined standard regarding the interval d will be considered below.

[0107] For example, as shown in Figures 3 and 4, when the lead wires 50 and 60 are taken out on opposite sides of the core case 20, the distance between the winding parts 41 and 42 is likely to be smaller than the distance between the lead wires 50 and 60. Therefore, the resonance of the common mode choke coil 221 is likely to occur due to the series resonance of the path RT1. Therefore, when the common mode choke coil 221 is 0 The condition regarding the interval (distance) d between winding portions 41 and 42 to prevent the occurrence of resonance is expressed by the following expressions (1) and (2).

[0108]

number

[0109] 5. C represents the line capacitance (stray capacitance) of the series resonance path RT1, and corresponds to the stray capacitance C1 in FIG. 5. ε0 represents the vacuum dielectric constant. φ represents the diameter of the electric wire of the winding 40. h represents the height of the core case 20, and corresponds to the axial dimension of the core case 20. In addition, in equation (2), taking into consideration that the relative dielectric constant of air is approximately 1, the vacuum dielectric constant ε 0In addition, in formula (2), the product of the height h of core case 20 and the diameter φ of the electric wire corresponds to the area of ​​the portions of winding portions 41, 42 that correspond to the electrodes where the electric wires face each other.

[0110] Here, the conditions of expressions (1) and (2) can be rearranged into the following expression (3), whose right-hand side corresponds to the predetermined standard regarding the distance d.

[0111]

number

[0112] For example, consider a case where the total inductance of the lead wire 50 and the winding portion 41 and the total inductance of the lead wire 60 and the winding portion 42 at 10 MHz to 100 MHz are both 0.5 μH (microhenries). In this case, the inductance L of the series resonance path RT1 is 1.0 μH. And, at 100 MHz (=f 0 The condition for preventing resonance from occurring below the target frequency f 0 By substituting 100 MHz for and 1 μH for inductance L, the following equation (4) is obtained, whose right-hand side corresponds to the predetermined standard for the distance d.

[0113]

number

[0114] In addition, in formula (4), the unit of the distance d between winding portions 41, 42, the wire diameter φ of winding 40, and the height h of core case 20 is mm (millimeters).

[0115] In this way, in this example, the dimensions of the protruding members 70 and the arrangement of the protruding members 70 can be set so as to satisfy formulas (3) and (4). This allows the common mode choke coil 221 to more appropriately suppress common mode noise in the high frequency band of 10 MHz to 100 MHz.

[0116] [Second example of common mode choke coil] Next, a second example of the common mode choke coil 221 according to this embodiment will be described with reference to FIGS.

[0117] Hereinafter, in this example, the same symbols are used for configurations that are the same as or correspond to those in the first example described above, and the explanation will focus on the parts that differ from the first example described above, and explanations of the same or corresponding content as in the first example described above may be omitted.

[0118] 7 and 8 are diagrams showing the configuration of a second example of the common mode choke coil 221. In FIG.

[0119] As shown in Figures 7 and 8, a common mode choke coil 221 according to this example differs from the first example described above in that it includes a partition plate 72 instead of the protrusion member 70, but may be the same as the first example described above in other respects.

[0120] The partition plate 72 is made of an insulator and is provided in the space on the inner circumferential side of the core case 20 so as to further divide the target space into two spaces for each space corresponding to the three-phase windings 40. Specifically, the partition plate 72 is set so that one of the two spaces divided by the partition plate 72 includes the winding portion 41 and the other includes the winding portion 42. This makes it possible to secure a certain degree of spacing between the winding portions 41 and 42 and spacing between the lead wires 50 and 60 connected to the winding portion 41 and the winding portion 42, respectively. Therefore, the line capacitance (stray capacitance) between the winding portions 41 and 42 and the line capacitance (stray capacitance) between the lead wires 50 and 60 can be made relatively small.

[0121] Specifically, the partition plate 72 may be provided so as to connect between the connection portion of the three partition plates 31 corresponding to the central axis of the core case 20 and the inner peripheral surface of the circumferential portion of the core case 20 adjacent to the target space. For example, as shown in Figs. 7 and 8, the partition plate 72 is provided so as to equally divide the central angle of 120 degrees defined by two adjacent partition plates 31 when viewed along the axial direction. The partition plate 72 may be formed of the same type of insulator as the core case 20 and the partition portion 30, or may be formed of a different type of insulator. In addition, the partition plate 72 may be molded integrally with the partition portion 30 and the core case 20, or may be molded separately and connected by a known method.

[0122] Thus, in this example, similarly to the first example described above, common mode choke coil 221 can separate winding parts 41, 42 by the action of partition plate 72, and can ensure a certain degree of distance between winding parts 41, 42. Therefore, in this example, common mode choke coil 221 can more appropriately suppress common mode noise in a high frequency band of 10 MHz or more, the noise source of which is inverter 230 with a switching frequency of 20 kHz or more.

[0123] For example, similarly to the first example described above, the dimensions of the partition plate 72 and the arrangement of the partition plate 72 can be set so as to satisfy the formulas (3) and (4). This enables the common mode choke coil 221 to more appropriately suppress common mode noise in the high frequency band of 10 MHz to 100 MHz.

[0124] [Third example of common mode choke coil] Next, a third example of the common mode choke coil 221 according to this embodiment will be described with reference to FIGS.

[0125] Hereinafter, in this example, the same symbols are used for configurations that are the same as or correspond to those in the first and second examples described above, and the explanation will focus on the parts that are different from the first and second examples described above, and explanations of the contents that are the same as or correspond to those in the first and second examples described above may be omitted.

[0126] 9 and 10 are diagrams showing the configuration of a third example of the common mode choke coil 221. In FIG.

[0127] As shown in Figures 9 and 10, the common mode choke coil 221 of this example differs from the first and second examples described above in that it includes pipe members 74, 76 instead of the protrusion member 70 and the partition plate 72, but in other respects may be the same as the first and second examples described above.

[0128] The tube member 74 is made of an insulator and is attached to the winding portion 41 in such a manner that the electric wire of the winding portion 41 is inserted into the hollow portion of the tube member 74. The tube member 74 may be made of the same type of insulator as the core case 20 and the partition portion 30, or may be made of a different type of insulator. The insulator is, for example, a synthetic resin or a synthetic rubber. The same may be true for the insulator used as the material of the tube member 76 below. The tube member 74 is arranged so that, for example, a part or all of the electric wire in the space on the inner periphery side of the core case 20 is included in the hollow portion out of the entire length of the electric wire of the winding portion 41 corresponding to one turn. The tube member 74 may also be arranged so that, in addition to the electric wire of the winding portion 41, a part or all of the lead wire 50 is included in the hollow portion. Thereby, the tube member 74 can be present between the winding portions 41 and 42, and as a result, the interval between the winding portions 41 and 42 and the interval between the lead wires 50 and 60 connected to the winding portion 41 and the winding portion 42, respectively, can be secured to a certain degree. Therefore, the line capacitance (stray capacitance) between winding portions 41 and 42 and the line capacitance (stray capacitance) between lead wires 50 and 60 can be made relatively small.

[0129] The tube member 76 is formed of an insulator like the tube member 74, and is attached to the winding portion 42 in such a manner that the electric wire of the winding portion 42 is inserted into the hollow portion of the tube member 76. The tube member 76 is arranged so that, for example, part or all of the electric wire in the space on the inner periphery side of the core case 20 is included in the hollow portion out of the total length of the electric wire of the winding portion 42 corresponding to one turn. The tube member 76 may be arranged so that part or all of the lead wire 60 is included in the hollow portion in addition to the electric wire of the winding portion 42. This allows the tube member 76 to be present between the winding portions 41 and 42, and as a result, the interval between the winding portions 41 and 42 and the interval between the lead wires 50 and 60 connected to the winding portion 41 and the winding portion 42, respectively, can be secured to a certain degree. Therefore, the line capacitance (stray capacitance) between the winding portions 41 and 42 and the line capacitance (stray capacitance) between the lead wires 50 and 60 can be made relatively small.

[0130] Thus, in this example, as in the first and second examples described above, the common mode choke coil 221 can separate the winding parts 41 and 42 by the action of the pipe members 74 and 76, and can ensure a certain degree of distance between the winding parts 41 and 42. Therefore, in this example, the common mode choke coil 221 can more appropriately suppress common mode noise in a high frequency band of 10 MHz or more, the noise source of which is the inverter 230 having a switching frequency of 20 kHz or more.

[0131] For example, similarly to the first example described above, the dimensions of the pipe member 74 and the arrangement of the pipe members 74, 76 can be set so as to satisfy the formulas (3) and (4). This enables the common mode choke coil 221 to more appropriately suppress common mode noise in the high frequency band of 10 MHz to 100 MHz.

[0132] [Other embodiments] Next, another embodiment will be described.

[0133] The above-described embodiment may be modified or altered as appropriate.

[0134] For example, in the above-described embodiment (first example of the common mode choke coil 221), the protruding member 70 may be provided to protrude from the core case 20 so as to be present between the winding portions 41 and 42. In this case, the protruding member 70 may be molded integrally with the core case 20, or may be molded separately from the core case 20 and connected by a known method.

[0135] For example, in the above-described embodiment (the third example of the common mode choke coil 221), only one of the pipe members 74 and 76 may be provided, and the other may be omitted.

[0136] Furthermore, in the above-described embodiment, instead of the protruding member 70, the partition plate 72, and the tube members 74, 76, another winding portion of the electric wire equivalent to one turn of the winding 40 other than the winding portions 41, 42 may be disposed between the winding portions 41, 42. In this way, the presence of the other winding portion can ensure a certain degree of spacing between the winding portions 41, 42. Therefore, the same actions and effects as those of the above-described embodiment can be achieved.

[0137] In the above-described embodiment and its modified examples, depending on the cross-sectional area of ​​the electric wire of winding 40 and the number of turns of winding 40, either one of winding parts 41, 42 may be wound so as to be adjacent to core case 20. In other words, there does not need to be an electric wire of another winding part corresponding to one turn of winding 40 between either one of winding parts 41, 42 and core case 20.

[0138] In the above-described embodiment and the modified and altered examples thereof, the power conversion device 200 may supply power to the motor of the fan 117 instead of or in addition to the motor 113M of the compressor 113 to drive it.

[0139] In the above-described embodiment and its modified and altered examples, at least one of the smoothing capacitor 232C and the reactor 232L may be omitted, or the smoothing circuit 232 itself may be omitted.

[0140] In the above-described embodiment and its modified examples, the commercial power source PS may supply single-phase AC to the power conversion device 200 instead of three-phase AC. In this case, the power lines L_R, L_S, and L_T are replaced with two power lines. In this case, the common mode choke coil 221 is replaced with a single-phase common mode choke coil, and the Y capacitor 222 is replaced with two Y capacitors that bypass each of the two power lines and the housing 110H. In this case, the single-phase common mode choke coil is provided with a winding for each of two phases corresponding to the two power lines, and is configured such that, similar to the above-described common mode choke coil 221, the winding parts corresponding to the first turns at one end and the other end of the winding are separated from each other for each of the two phases.

[0141] In the above-described embodiment and its modified and altered examples, the power device 231PD of the rectifier circuit 231 may be a semiconductor switch. In this case, the noise filter 220 including the common mode choke coil 221 can suppress common mode noise originating from the rectifier circuit 231 as a noise source.

[0142] The power conversion device 200 of the above-described embodiment may be mounted on a chiller other than the air conditioner 100. In other words, the power conversion device 200 of the above-described embodiment may be mounted on any device having a refrigeration cycle.

[0143] Furthermore, the power conversion device 200 of the above-described embodiment may be mounted on a device other than a refrigerator to drive an electric motor or the like mounted on the device. For example, the power conversion device 200 of the above-described embodiment may be mounted on a vehicle to drive an electric motor or the like of the vehicle.

[0144] [Effect] Next, the operation of the power conversion device and the air conditioner according to this embodiment will be described.

[0145] In this embodiment, the power conversion device includes a noise filter including a choke coil. The power conversion device is, for example, the power conversion device 200 described above. The noise filter is, for example, the noise filter 220 described above. The choke coil is, for example, the common mode choke coil 221 described above. Specifically, the choke coil includes an annular member, a case portion, a winding of multiple phases, a first member, and a second member. The annular member is, for example, the magnetic core 10 described above. The case portion is, for example, the core case 20 described above. The winding is, for example, the winding 40 described above. The first member is, for example, the partition portion 30 described above. The second member is, for example, the protruding member 70, the partition plate 72, or the tube member 74 described above. More specifically, the annular member is formed in an annular shape from a magnetic material. Moreover, the case portion accommodates the annular member. Moreover, the winding of multiple phases is wound around the annular member from above the case portion so that the electric wires form overlapping layers. The partition 30 has insulating properties and divides the space inside the inner circumference of the case into spaces for each phase of the winding. The second member has insulating properties and, in each space for one phase of the winding divided by the first member, maintains the distance between the first winding portion corresponding to the first turn from one end of the winding and the second winding portion corresponding to the first turn from the other end of the winding so that the distance is relatively large with respect to a predetermined standard. The predetermined standard corresponds to, for example, the right side of the above-mentioned formulas (3) and (4).

[0146] This allows a relatively large gap to be secured between the first winding portion of the first turn at one end of the winding and the second winding portion of the first turn at the other end of the winding for each of the multiple phases of the choke coil. This allows the line capacitance between the first winding portion and the second winding portion to be reduced. Thus, the power conversion device can more appropriately suppress common mode noise by using a noise filter including a choke coil.

[0147] In addition, in this embodiment, when the distance corresponding to the interval between the first winding portion and the second winding portion is d, the diameter of the winding wire is φ, and the height of the case portion is h, the interval between the first winding portion and the second winding portion may satisfy the above-mentioned formula (4).

[0148] This allows the power conversion device to have a relatively small inter-line capacitance between the first winding part and the second winding part, and allows the noise filter including the choke coil to more appropriately suppress common mode noise.

[0149] In addition, in this embodiment, in each space for one phase of the winding separated by the first member, there may be another winding part different from the first winding part between the first winding part and the case part, and there may be another winding part different from the second winding part between the second winding part and the case part.

[0150] This makes it possible to make the inter-line capacitance between the first winding part and the second winding part relatively small, even in a structure in which other winding parts are present between the first winding part or the second winding part and the case part, and the distance between the first winding part and the second winding part tends to be relatively close.

[0151] In addition, in this embodiment, in each space for one phase of the winding separated by the first member, there may be another winding part different from the first winding part between the first winding part and the case part, and there may be another winding part different from the second winding part between the second winding part and the case part.

[0152] This makes it possible to make the inter-line capacitance between the first winding part and the second winding part relatively small, even in a structure in which other winding parts are present between the first winding part and the second winding part and the case part, and the distance between the first winding part and the second winding part is likely to become even closer.

[0153] In the present embodiment, the second member may be made of the same material as the case portion or the first member.

[0154] This makes it possible to realize, for example, the second member as a part that is molded integrally with the case portion and the first member.

[0155] The power supply may include a switching device that is driven at a switching frequency of 20 kHz or more. The switching device may be, for example, the above-mentioned power device 233PD or power device 231PD.

[0156] As a result, even when a noise level at high frequencies of 10 MHz or more becomes relatively high due to switching operations at switching frequencies of 20 kHz or more, for example, the power conversion device can appropriately suppress common mode noise.

[0157] In this embodiment, the cross-sectional area of ​​the winding for each of the multiple phases is 1.75 mm 2 It may be more than that.

[0158] This makes it possible to make the inter-wire capacitance between the first winding portion and the second winding portion relatively small, even in a structure in which the cross-sectional area of ​​the winding is relatively large and the distance between the first winding portion and the second winding portion is likely to become closer.

[0159] In the present embodiment, the air conditioner may include the above-mentioned power conversion device. The air conditioner is, for example, the air conditioner 100 described above.

[0160] This enables the power conversion device to suppress noise radiated to the outside of the air conditioner.

[0161] Although the embodiments have been described above, it will be understood that various changes in form and details are possible without departing from the spirit and scope of the claims. [Explanation of symbols]

[0162] 10 Magnetic core 20 Core Case 30 Partition 31 Partition 40 Windings 41,42 Winding section 50,60 Lead Wire 70 Protruding member 72 Partition 74,76 Pipe members 100 Air conditioner 110 Outdoor unit 110H case 113 Compressor 113M electric motor 120 Indoor unit 130,140 Refrigerant path 200 Power conversion device 220 Noise Filter 221 Common mode choke coil 222 Y capacitor 230 Inverter 231 Rectifier circuit 232 Smoothing circuit 233 Inverter Circuit L_N1 Power line L_P1 Power line L_R power line L_R1~L_R5 Power line L_S power line L_S1~L_S5 Power line L_T Power line L_T1~L_T5 Power line PS commercial power supply

Claims

1. A noise filter including a choke coil is provided. The choke coil is An annular member formed of a magnetic material; an annular case portion that houses the annular member; a plurality of phase windings wound around the annular member from above the case portion in overlapping layers; a first member having insulating properties and dividing a space inside an inner periphery of the case portion into spaces for each phase of the winding; a second member having insulating properties and maintaining a distance between a first winding portion corresponding to a first turn from one end of the winding and a second winding portion corresponding to a first turn from the other end of the winding in each of the spaces for one phase so that the distance is relatively large with respect to a predetermined standard; Power conversion equipment.

2. When a distance corresponding to the interval is d, a diameter of the electric wire of the winding is φ, and a height of the case portion is h, the interval satisfies the following formula: The power conversion device according to claim 1 . [0010]

3. In each of the spaces for one phase, there is another winding portion different from the first winding portion between the first winding portion and the case portion, or there is another winding portion different from the second winding portion between the second winding portion and the case portion. The power conversion device according to claim 1 or 2.

4. In each of the spaces for one phase, there is another winding portion different from the first winding portion between the first winding portion and the case portion, and there is another winding portion different from the second winding portion between the second winding portion and the case portion. The power conversion device according to claim 3 .

5. The second member is formed of the same material as the case portion or the first member. The power conversion device according to claim 1 or 2.

6. A switching device driven at a switching frequency of 20 kHz or more. The power conversion device according to claim 1 or 2.

7. The cross-sectional area of ​​the winding for each of the multiple phases is 1.75 mm ２ That's all. The power conversion device according to claim 1 or 2.

8. A power conversion device comprising the power conversion device according to claim 1 or 2. Air conditioner.

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