Power conversion device, 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 Art

[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

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a common mode choke coil employed in a power conversion device with a relatively large current amount, for example, a wire with a relatively large cross-sectional area is used for winding, and the number of turns may be made relatively large in order to increase the impedance in the kHz (kilohertz) band. In this case, as the occupation ratio of the winding increases, the inter-wire capacitance for each winding part corresponding to one turn of the winding increases, and as a result, the impedance in the high-frequency band of the MHz (megahertz) band may decrease. Further, due to the increase in the inter-wire capacitance, the resonance frequency decreases, and a self-resonance frequency appears in the frequency band of 100 MHz or less, and there is a possibility that the impedance decreases due to resonance in the high-frequency band of the MHz band. Therefore, there is a possibility that common mode noise cannot be appropriately suppressed in the high-frequency band of 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 Problems

[0006] In a first aspect of the present disclosure, A noise filter including a choke coil is provided. The choke coil includes: 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 so as to form an overlapping layer with respect to the annular member; A first member having insulation and partitioning a space inside the inner circumference of the case portion into spaces for each phase of the windings; A second member having insulation and maintaining the distance between a first winding portion corresponding to the first turn from one end of the winding and a second winding portion corresponding to the first turn from the other end of the winding to be relatively large with respect to a predetermined standard in each of the spaces for each phase. A power conversion device is provided.

[0007] According to this aspect, for each of the multiple phases of the choke coil, it is possible to ensure a relatively large distance 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 inter-wire capacitance between the first winding portion and the second winding portion can be reduced. Thus, the power conversion device can more appropriately suppress common-mode noise by the noise filter including the choke coil.

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

[0009]

Equation

[0010] Further, in the third aspect of the present disclosure, on the premise of the above-described first or second aspect, In each of the spaces for the single 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] Further, in a fourth aspect of the present disclosure, on the premise of the above-described third aspect, In each of the spaces for the single phase, there is 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] Further, in a fifth aspect of the present disclosure, on the premise of any one of the above-described first to fourth aspects, The second member may be formed of the same material as the case part or the first member.

[0013] Further, in a sixth aspect of the present disclosure, on the premise of any one of the above-described first to fifth aspects, A switching device driven at a switching frequency of 20 kHz or more may be provided.

[0014] Further, in a seventh aspect of the present disclosure, on the premise of any one of the above-described first to sixth aspects, The cross-sectional area of the winding for each of the plurality of phases may be 1.75 mm 2 or more.

[0015] Further, in an eighth aspect of the present disclosure, an air conditioner including the power conversion device according to any one of the above-described first to seventh aspects is provided. An air conditioner is provided.

Advantages 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

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Mode for Carrying Out the Invention

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

[0019] [Outline of Air Conditioner] With reference to FIG. 1, the outline of the air conditioner 100 according to the present embodiment will be described.

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

[0021] As shown in FIG. 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 composed of the outdoor unit 110, the indoor unit 120, the refrigerant paths 130 and 140, etc., and adjusts the temperature, humidity, etc. of the room where the indoor unit 120 is installed.

[0022] The outdoor unit 110 is arranged outside the 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 and 140, sucks refrigerant from one of the refrigerant paths 130 and 140, and discharges the refrigerant to the other.

[0023] The indoor unit 120 is arranged inside the building whose temperature and the like are to be adjusted. The indoor unit 120 is connected to the other end of each of the refrigerant paths 130 and 140, sucks refrigerant from one of the refrigerant paths 130 and 140, and discharges the refrigerant to the other.

[0024] The refrigerant paths 130 and 140 are constituted by, for example, pipelines, and connect between 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 constituted as pipelines, for example.

[0027] The refrigerant path L1 connects between one end of the refrigerant path 130 outside the outdoor unit 110 and 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 between the four-way switching valve 111 and the outdoor heat exchanger 115.

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

[0034] The refrigerant path L6 connects between one end of the refrigerant path 140 outside the outdoor unit 110 and the outdoor expansion valve 116.

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

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

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

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

[0039] During the cooling operation of the air conditioner 100, the four-way switching valve 111 connects the path of the solid line in Fig. 1. Specifically, during the 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, in the case of the heating operation of the air conditioner 100, the four-way switching valve 111 connects the path of the dotted line in Fig. 1. Specifically, during the heating operation of the air conditioner 100, 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 the liquid refrigerant contained in the refrigerant sucked from the refrigerant path L21 and discharges the refrigerant from which part or all of the liquid refrigerant has been removed to the refrigerant path L22. The liquid refrigerant separated by the accumulator 112 contains oil. The accumulator 112 is provided with an oil discharge port connected to the oil path L8, and the oil containing the separated refrigerant flows out to the oil path L8 through the oil discharge port and returns to the compressor 113 through the oil path L8 and the refrigerant path L22.

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

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

[0044] On the other hand, during the heating operation of the air conditioner 100, the high-temperature and high-pressure refrigerant compressed by the compressor 113 flows out to the refrigerant path 130 outside the outdoor unit 110 through the refrigerant path L3 and the refrigerant path L1. Then, the high-temperature and 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 allows the refrigerant after a part or all of the oil has been separated and removed to flow out into the refrigerant path L32. The oil separator 114 is provided with an oil discharge port connected to the oil path L7, and the oil separated from the refrigerant flows out into the oil path L7 through the oil discharge port, and is returned to the compressor 113 through the oil path L7 and the refrigerant path L22.

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

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

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

[0049] The outdoor expansion valve 116 is closed to a predetermined opening during the 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 opened during the cooling operation of the air conditioner 100, and allows the refrigerant (liquid refrigerant) to pass 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] During the cooling operation of the air conditioner 100, the indoor expansion valve 121 is closed to a predetermined opening degree, and reduces the pressure of the subcooled liquid refrigerant flowing in from the refrigerant path 140 to a predetermined pressure. On the other hand, during the heating operation of the air conditioner 100, the indoor expansion valve 121 is fully opened, 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, an electromagnetic valve.

[0052] The indoor heat exchanger 122 performs heat exchange between the indoor air and the refrigerant passing through its interior. Specifically, due to the action of the fan 123 mounted on the indoor unit 120, indoor air passes around the indoor heat exchanger 122, and heat exchange is promoted between the indoor air and the refrigerant inside the indoor heat exchanger 122. Then, due to the action of the fan 123, the indoor air that has undergone heat exchange with the refrigerant inside the indoor heat exchanger 122 is sent out of the indoor unit 120, thereby realizing indoor cooling or heating.

[0053] During the cooling operation of the air conditioner 100, the indoor heat exchanger 122 absorbs heat from the indoor air by the low-temperature and low-pressure liquid refrigerant depressurized by the indoor expansion valve 121, and lowers the temperature of the indoor air.

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

[0055] [Configuration of Power Conversion Device] Next, with reference to FIG. 2, the configuration of the power conversion device 200 mounted on the air conditioner 100 according to the present embodiment will be described.

[0056] FIG. 2 is a diagram showing an example configuration of the power conversion device 200.

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

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

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

[0060] The terminal T_FG is provided on the housing 110H and is grounded outside the housing 110H. Thereby, the housing 110H is regarded as a reference potential part corresponding to the ground.

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

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

[0063] The power line L_S supplies the AC of the S phase of the commercial power supply PS to the inverter 230. The power line L_S includes power lines L_S1 to L_S5.

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

[0065] The power lines L_R1, L_S1, and L_T1 are each connected between the commercial power supply PS and the power terminal block 210. The power lines L_R2, L_S2, and L_T2 are each connected between 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 the substrate on which the noise filter is mounted. The power lines L_R5, L_S5, and L_T5 are each connected between the other end 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 or branches the three-phase alternating current supplied by the power lines L_R1, L_S1, and L_T1 to various devices.

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

[0068] The noise filter 220 suppresses the current noise 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 substrate.

[0069] The common mode choke coil 221 acts as an inductor with respect to the 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 to suppress the noise current.

[0070] The Y capacitor 222 has the function of returning the common mode current flowing out to the ground to the noise source (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 between the power line L_R4 and the housing 110H corresponding to the ground. The Y capacitor 222S is provided in a bypass path connecting between the power line L_S4 and the housing 110H corresponding to the ground. The Y capacitor 222T is provided in a bypass path connecting between the power line L_T4 and the housing 110H corresponding to the ground.

[0072] The inverter 230 uses three-phase alternating current supplied through the power lines L_R, L_S, and L_T to generate three-phase alternating current of a predetermined voltage and frequency and output it to the motor 113M. Thereby, the power conversion device 200 can drive the compressor 113. The inverter 230 may be mounted on a substrate different from the substrate on which the noise filter 220 is mounted, or may be mounted on different substrates. 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 alternating current of the power lines L_R5, L_S5, and L_T5 into direct current and outputs it to the power 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 rectifying diode made of a semiconductor.

[0074] The smoothing circuit 232 smooths the direct current of the power 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 between the power lines L_P1 and L_N1. The smoothing capacitor 232C appropriately 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.

[0076] The reactor 232L is provided on the power line L_P1. For example, the reactor 232L is provided on the power line L_P1 between the rectifier circuit 231 and the smoothing capacitor 232C. The reactor 232L appropriately 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 to prevent changes in current.

[0077] The inverter circuit 233 is connected to the other ends of the power lines L_P1 and 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 IGBT (Insulated Gate Bipolar Transistor), a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), a HEMT (High Electron Mobility Transistor), etc. The semiconductor switch is composed mainly of, for example, silicon (Si). Also, the semiconductor switch may be composed mainly of a wide bandgap semiconductor material. Also, in addition to the semiconductor switch, the power device 233PD may include 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 three-phase alternating current (i.e., alternating current of the U-phase, V-phase, and W-phase) having a predetermined frequency and a predetermined voltage by the switching operation of the power device 233PD, and outputs it to the motor 113M. The power device 233PD may have a relatively high switching speed. For example, the switching speed (i.e., the time required for switching) of the power device 233PD is 10 nanoseconds or less. The switching frequency of the power device 233PD is set to, for example, 20 kHz or more. Thereby, the frequency of the noise generated due to the switching operation of the power device 233PD can be made outside the audible range of humans.

[0079] The heat radiating part 240 radiates the heat of the power device 233PD to the outside of the power device 233PD.

[0080] For example, the heat radiating part 240 is a heat sink and is connected to the housing 110H. The power device 233PD and the heat radiating part 240 (heat sink) are thermally coupled so that heat conduction is possible.

[0081] The power device 233PD and the heat radiating part 240 (heat sink) are indirectly in contact with each other through a heat dissipation promoting member which is an insulator, for example, so that heat conduction is possible. The heat dissipation promoting member is, for example, a heat conduction sheet containing a heat conduction filler, heat conduction grease, or the like. Also, the power device 233PD and the heat radiating part 240 (heat sink) may be in direct contact with each other so that heat conduction is possible.

[0082] Also, the heat radiating part 240 may be a water jacket or the like through which a refrigerant flows inside.

[0083] [First Example of Common Mode Choke Coil] Next, with reference to FIGS. 3 to 6, a first example of the common mode choke coil 221 will be described.

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

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

[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 formed of a magnetic material (magnetic substance). The magnetic substance is, for example, ferrite or carbonyl iron. The magnetic core 10 is a so-called toroidal core, and when viewed along the axial direction (the direction perpendicular to the plane in which FIGS. 3 and 4 are drawn), it has an annular shape and is formed in a donut shape having a predetermined width in the axial direction.

[0088] The core case 20 houses the magnetic core 10 in its internal hollow portion. The core case 20, when viewed along the axial direction, has the same annular shape as the magnetic core 10 and is formed in a donut shape having a predetermined width in the axial direction, and the shape of the hollow portion is formed to be the same as or slightly larger than that of the magnetic core 10. The core case 20 is formed of an insulator (insulating material) to ensure the insulation between the magnetic core 10 and the winding 40. The insulator is, for example, synthetic resin (plastic).

[0089] The partition portion 30 is formed of an insulator and partitions the space on the inner peripheral side of the core case 20 into spaces for each of the three-phase (R-phase, S-phase, and T-phase) windings 40. Thereby, the partition portion 30 can ensure the insulation between the adjacent windings 40 in the circumferential direction of the core case 20. The partition portion 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 portion 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 peripheral surface of the core case 20, extend radially from the inner peripheral surface of the core case 20 toward the central axis of the core case 20, and are connected so as to converge at the central axis of the core case 20. Thereby, when viewed along the axial direction, the partition portion 30 can partition the space on the inner peripheral side of the core case 20 into three fan-shaped spaces with a central angle of 120 degrees. The partition portion 30 may be integrally formed with the core case 20 or may be formed separately and then connected by a known method.

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

[0091] In this example, the windings 40 of each phase may be formed of an electric wire having a relatively large cross-sectional area. This is because the required amount of current in the power conversion device 20 is relatively large. For example, the cross-sectional area of the electric wire of the winding 40 of each phase is 1.75 mm 2 or more.

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

[0093] When the cross-sectional area of the wire of the winding 40 is relatively large or the number of turns of the winding 40 is relatively large, the occupation ratio of the winding 40 in the space corresponding to each phase partitioned by the partition portion 30 on the inner peripheral side of the core case 20 may become relatively large. Therefore, for example, as shown in FIG. 4, the winding 40 of each phase is wound such that the wires overlap on the core case 20 and form a plurality of layers (three layers in this example) in the space corresponding to each phase on the inner peripheral side of the core case 20.

[0094] For example, as shown in FIG. 4, starting from a position approximately half the length of the wire corresponding to the winding 40, the wires on both the one end side and the other end side are wound in opposite directions in the circumferential direction of the core case 20. In this process, when the inner peripheral surface of the core case 20 is covered with the wire and there is no area on the surface of the core case 20 where the wire is wound, the wire is wound so as to overlap the wire already wound around the core case 20. Then, the winding of the wire ends at a location closer to the center of the space radially inside the inner circumference of the core case 20, and the lead wires 50 and 60 are drawn out from that location.

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

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

[0097] The protruding member 70 is formed of an insulator, and in the space on the inner peripheral side of the core case 20, for each space corresponding to the three-phase windings 40, it is provided so as to protrude radially outward from the connecting portion of the three partition plates 31 corresponding to the central axis of the core case 20. The protruding member 70 may be formed of the same type of insulator as the core case 20 or the partition portion 30, or may be formed of a different type of insulator. Also, the protruding member 70 may be integrally formed with the partition portion 30, or may be formed separately from the partition portion 30 and connected by a known method. The protruding member 70 is disposed between the winding portion 41 corresponding to one turn of one end of the winding 40 and the winding portion 42 corresponding to one turn of the other end of the winding 40 in each of the three spaces partitioned by the partition portion 30 on the inner peripheral side of the core case 20. Thereby, it is possible to ensure to some extent the intervals between the winding portions 41 and 42 and the intervals between the lead wires 50 and 60 connected to the winding portions 41 and 42 respectively. Therefore, the inter-winding capacitance (stray capacitance) between the winding portions 41 and 42 and the inter-winding capacitance (stray capacitance) between the lead wires 50 and 60 can be made relatively small. For example, as shown in FIGS. 3 and 4, the protruding member 70 is provided so as to protrude in the 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] <Frequency Characteristics of Impedance of Common-Mode Choke Coil> FIG. 5 is a diagram showing an equivalent circuit of the common-mode choke coil 221 expressed as a distributed constant circuit. FIG. 6 is a diagram showing the frequency characteristics of the impedance of the common-mode choke coil 221 according to the embodiment and the common-mode choke coil according to the comparative example.

[0099] Furthermore, the common mode choke coil according to the comparative example is different from the common mode choke coil 221 according to the embodiment (Figs. 3 and 4) in that the protruding member 70 is not provided, and is the same as the common mode choke coil 221 according to the embodiment in other respects.

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

[0101] Also, as shown in Fig. 5, there is a capacitive coupling between the turns of the winding 40, and the coupling state can be represented as a capacitance (stray capacitance). For example, the capacitive coupling state between the lead wires 50 and 60 is represented as a stray capacitance C0, and the capacitive coupling state between the winding portions 41 and 42 is represented as a stray capacitance C1.

[0102] For example, as shown in Figs. 3 and 4, in the space on the inner peripheral side of the core case 20, when the wires of the winding 40 overlap to form a plurality of layers and the winding portions 41 and 42 are arranged near the center in the radial direction, the distance between the winding portions 41 and 42 of the winding 40 may become very close.

[0103] In this case, in the common-mode choke coil according to the comparative example, since the protruding member 70 does not exist, the parasitic capacitance C0 between the lead wires 50 and 60 and the parasitic capacitance C1 between the winding portions 41 and 42 become relatively large. Therefore, in the common-mode choke coil according to the comparative example, the resonance 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, resonance appears in the frequency band of several tens of MHz, and thus the impedance may significantly decrease in the frequency band of 10 MHz or higher. 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 higher.

[0104] In particular, as described above, when the switching frequency of the inverter 230 is 20 kHz or higher, the noise level in the high-frequency band of 10 MHz or higher becomes relatively high. Therefore, in the common-mode choke coil according to the comparative example, there is a possibility that the common-mode noise with the inverter 230 having a switching frequency of 20 kHz or higher as the noise source cannot be sufficiently suppressed.

[0105] On the other hand, the common-mode choke coil 221 according to the embodiment (the first example) can separate the protruding member 70 between the winding portions 41 and 42 and ensure a certain distance between the winding portions 41 and 42. 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 the frequency band of 10 MHz or higher. Therefore, the common-mode choke coil 221 according to the embodiment can more appropriately suppress the common-mode noise in the high-frequency band of 10 MHz or higher with, for example, the inverter 230 having a switching frequency of 20 kHz or higher as the noise source.

[0106] <Condition of the distance between the winding portions at one end and the other end of the winding wire> As described above, the higher the resonance frequency of the common mode choke coil 221, the more the decrease in impedance in a high frequency band of 10 MHz or higher can be suppressed, and the more the common mode noise removal characteristics in a high frequency band of 10 MHz or higher can be improved. Therefore, it is desirable that the distance d between the winding portions 41 and 42 be maintained to be relatively large with respect to a predetermined reference. That the distance d is relatively large with respect to a predetermined reference may mean that the distance d is equal to or greater than the predetermined reference, or may mean that the distance d is greater than the predetermined reference. Hereinafter, the predetermined reference regarding the distance d will be examined.

[0107] For example, as shown in FIGS. 3 and 4, when the lead wires 50 and 60 are taken out on opposite sides with respect to the core case 20, the distance between the winding portions 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 appear as a series resonance of the path RT1. Thus, the conditions regarding the distance d between the winding portions 41 and 42 for preventing the resonance of the common mode choke coil 221 from occurring at a frequency equal to or lower than the target frequency f0 are expressed by the following formulas (1) and (2).

[0108]

Equation

[0109] Note that L represents the inductance of the series resonance path RT1 and corresponds to the combined inductance of the series of inductances Lx1, L_1, L_2, and Lx_2 in FIG. 5. Also, C represents the inter-wire capacitance (stray capacitance) of the series resonance path RT1 and corresponds to the stray capacitance C1 in FIG. 5. Also, ε0 represents the permittivity of free space. Also, φ represents the diameter of the wire of the winding 40. Also, h represents the height of the core case 20 and corresponds to the axial dimension of the core case 20. Also, in formula (2), the permittivity of free space ε0 is used in consideration of the fact that the relative permittivity of air is about 1. Also, in formula (2), the product of the height h of the core case 20 and the wire diameter φ corresponds to the area of the portion corresponding to the electrodes where the wires of both winding portions 41 and 42 face each other.

[0110] Here, the conditions of Expressions (1) and (2) can be arranged by the following Expression (3), and the right side thereof corresponds to a predetermined standard regarding the interval 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 are both 0.5 μH (microhenry) at 10 MHz to 100 MHz. In this case, the inductance L of the series resonance path RT1 becomes 1.0 μH. Then, in order to prevent resonance from occurring at 100 MHz (= f0) or lower, the condition is expressed by the following Expression (4) by substituting 100 MHz for the target frequency f0 in Expression (3) and substituting 1 μH for the inductance L, and the right side thereof corresponds to a predetermined standard regarding the interval d.

[0113] [Number]

[0114] Note that the units of the interval d between the winding portions 41 and 42, the wire diameter φ of the winding wire 40, and the height h of the core case 20 in Expression (4) are mm (millimeter).

[0115] Thus, in this example, the dimensions of the protruding member 70 and the arrangement of the protruding member 70 can be set so as to satisfy Expression (3) and Expression (4). Thereby, the common mode choke coil 221 can 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, with reference to FIGS. 7 and 8, a second example of the common mode choke coil 221 according to the present embodiment will be described.

[0117] Hereinafter, in this example, the same or corresponding components as those in the above-described first example are denoted by the same reference numerals, and the description will focus on the parts different from the above-described first example, and the description of the same or corresponding content as the above-described first example may be omitted.

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

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

[0120] The partition plate 72 is formed of an insulator and is provided so as to further partition the target space into two spaces for each space corresponding to the three-phase windings 40 in the space on the inner peripheral side of the core case 20. Specifically, the partition plate 72 is set such that one of the two spaces partitioned by the partition plate 72 includes the winding portion 41 and the other includes the winding portion 42. Thereby, it is possible to ensure to some extent the intervals between the winding portions 41 and 42 and the intervals between the lead wires 50 and 60 connected to the winding portion 41 and the winding portion 42, respectively. Therefore, the inter-winding capacitance (stray capacitance) between the winding portions 41 and 42 and the inter-winding 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 connecting 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 adjacent to the target space of the core case 20. For example, as shown in FIGS. 7 and 8, the partition plate 72 is provided so as to bisect 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 or the partition portion 30, or may be formed of a different type of insulator. Further, the partition plate 72 may be integrally formed with the partition portion 30 or the core case 20, or may be formed separately and connected by a known method.

[0122] Thus, in this example, the common-mode choke coil 221 can, by the action of the partition plate 72, separate between the winding portions 41 and 42 and ensure a certain distance between the winding portions 41 and 42, similar to the first example described above. 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 higher with an inverter 230 having a switching frequency of 20 kHz or higher as a noise source.

[0123] For example, similar to the case of 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 equations (3) and (4). As a result, the common-mode choke coil 221 can more appropriately suppress common-mode noise in a high-frequency band of 10 MHz to 100 MHz.

[0124] [Third Example of Common-Mode Choke Coil] Next, with reference to FIGS. 9 and 10, a third example of the common-mode choke coil 221 according to the present embodiment will be described.

[0125] Hereinafter, in this example, the same or corresponding components as those in the first and second examples described above are denoted by the same reference numerals, and the description will focus on the parts different from the first and second examples described above, and the description of the same or corresponding content as the first and second examples described above may be omitted.

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

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

[0128] The tube member 74 is formed 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 its hollow portion. The tube member 74 may be formed of the same type of insulator as the core case 20 or the partition portion 30, or may be formed of a different type of insulator. The insulator is, for example, a synthetic resin, a synthetic rubber, or the like. The same may apply to the insulator used as the material of the tube member 76 hereinafter. The tube member 74 is arranged, for example, so as to include a part or all of the electric wire in the space on the inner peripheral side of the core case 20 in the entire length of the electric wire of the winding portion 41 corresponding to one turn in the hollow portion. Further, the tube member 74 may be arranged so as to include a part or all of the lead wire 50 in the hollow portion in addition to the electric wire of the winding portion 41. Thereby, the tube member 74 can be present between the winding portions 41 and 42, and as a result, it is possible to secure to some extent the interval between the winding portions 41 and 42 and the intervals between the lead wires 50 and 60 connected to the winding portions 41 and 42, respectively. Therefore, the inter-wire capacitance (stray capacitance) between the winding portions 41 and 42 and the inter-wire capacitance (stray capacitance) between the lead wires 50 and 60 can be made relatively small.

[0129] The tube member 76 is formed of an insulator in the same manner as 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 its hollow portion. The tube member 76 is arranged, for example, so as to include a part or all of the electric wire in the space on the inner peripheral side of the core case 20 in the entire length of the electric wire of the winding portion 42 corresponding to one turn in the hollow portion. Further, the tube member 76 may be arranged so as to include a part or all of the lead wire 60 in the hollow portion in addition to the electric wire of the winding portion 42. Thereby, the tube member 76 can be present between the winding portions 41 and 42, and as a result, it is possible to secure to some extent the interval between the winding portions 41 and 42 and the intervals between the lead wires 50 and 60 connected to the winding portions 41 and 42, respectively. Therefore, the inter-wire capacitance (stray capacitance) between the winding portions 41 and 42 and the inter-wire capacitance (stray capacitance) between the lead wires 50 and 60 can be made relatively small.

[0130] Thus, in this example, the common mode choke coil 221 can, by the action of the pipe members 74 and 76, separate between the winding portions 41 and 42 and ensure a certain distance between the winding portions 41 and 42, similar to the first and second examples described above. 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 higher with an inverter 230 having a switching frequency of 20 kHz or higher as a noise source.

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

[0132] [Other Embodiments] Next, other embodiments will be described.

[0133] The above-described embodiments may be appropriately modified or changed.

[0134] For example, in the above-described embodiment (the first example of the common mode choke coil 221), the protruding member 70 may be provided so as 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 integrally formed with the core case 20, or may be formed 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] Further, in the above-described embodiment, instead of the protruding member 70, the partition plate 72, and the pipe members 74 and 76, it may be arranged such that between the winding portions 41 and 42, there is an electric wire of another winding portion corresponding to one turn of the winding wire 40 other than the winding portions 41 and 42. Thereby, due to the presence of the other winding portion, the interval between the winding portions 41 and 42 can be ensured to a certain extent. Therefore, the same operations and effects as those of the above-described embodiment are achieved.

[0137] Further, in the above-described embodiment and its modified and changed examples, depending on the cross-sectional area of the electric wire of the winding wire 40 and the number of turns of the winding wire 40, either one of the winding portions 41 and 42 may be wound so as to be adjacent to the core case 20. That is, between either one of the winding portions 41 and 42 and the core case 20, there may not be an electric wire of another winding portion corresponding to one turn of the winding wire 40.

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

[0139] Further, in the above-described embodiment and its modified and changed 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] Further, in the above-described embodiment and its modified and changed examples, the commercial power supply PS may supply single-phase alternating current instead of three-phase alternating current to the power conversion device 200. In this case, the power supply lines L_R, L_S, and L_T are replaced with two power supply lines. Also, 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 the housing 110H for each of the two power supply lines. Also, in this case, the single-phase common-mode choke coil is provided with windings for each of the two phases corresponding to the two power supply lines, and similar to the above-described common-mode choke coil 221, for each of the two phases, the winding portions corresponding to the first turns of the one end and the other end of the winding are configured to be separated from each other.

[0141] Also, in the above-described embodiments and examples of their modifications and changes, 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 the common-mode noise having the rectifier circuit 231 as a noise source.

[0142] The power conversion device 200 of the above-described embodiment may be mounted on a refrigerator different from the air conditioner 100. That is, the power conversion device 200 of the above-described embodiment may be mounted on any device having a refrigeration cycle.

[0143] Also, the power conversion device 200 of the above-described embodiment may be mounted on a device different from the refrigerator and 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 and drive an electric motor or the like of the vehicle.

[0144] [Operation] Next, the operation of the power conversion device and the air conditioner according to the present 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 above-described power conversion device 200. The noise filter is, for example, the above-described noise filter 220. The choke coil is, for example, the above-described common mode choke coil 221. Specifically, the choke coil includes an annular member, a case portion, windings of a plurality of phases, a first member, and a second member. The annular member is, for example, the above-described magnetic core 10. The case portion is, for example, the above-described core case 20. The winding is, for example, the above-described winding 40. The first member is, for example, the above-described partition portion 30. The second member is, for example, the above-described protrusion member 70, partition plate 72, or pipe member 74. More specifically, the annular member is formed in an annular shape of a magnetic material. Also, the case portion houses the annular member. Also, the windings of a plurality of phases are wound around the annular member from above the case portion so that the electric wires overlap to form a layer. Also, the partition portion 30 has insulating properties and partitions the space inside the inner circumference of the case portion into spaces for each phase of the winding. And the second member has insulating properties and 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 to be relatively large with respect to a predetermined standard in each of the spaces for one phase of the winding partitioned by the first member. The predetermined standard corresponds to, for example, the right sides of the above-described formulas (3) and (4).

[0146] Thereby, for each of the plurality of phases of the choke coil, it is possible to ensure a relatively large distance 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 inter-wire capacitance between the first winding portion and the second winding portion can be reduced. Thus, the power conversion device can more appropriately suppress common mode noise by the noise filter including the choke coil.

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

[0148] As a result, the power conversion device can make the inter-turn capacitance between the first winding part and the second winding part relatively small, and the common-mode noise can be more appropriately suppressed by the noise filter including the choke coil.

[0149] Further, in the present embodiment, in each of the spaces for each phase of the winding partitioned 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 also, between the second winding part and the case part, there may be another winding part different from the second winding part.

[0150] As a result, even in a structure where there are other winding parts 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 is likely to be relatively close, the inter-turn capacitance between the first winding part and the second winding part can be made relatively small.

[0151] Further, in the present embodiment, in each of the spaces for each phase of the winding partitioned by the first member, there is another winding part different from the first winding part between the first winding part and the case part, and also, between the second winding part and the case part, there may be another winding part different from the second winding part.

[0152] As a result, even in a structure where there are other winding parts 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 more likely to be closer, the inter-turn capacitance between the first winding part and the second winding part can be made relatively small.

[0153] Further, in the present embodiment, the second member may be formed of the same material as the case part or the first member.

[0154] As a result, for example, the second member can be realized as a part integrally formed with the case part or the first member.

[0155] It may be provided with a switching device driven at a switching frequency of 20 kHz or more. The switching device is, for example, the power device 233PD or the power device 231PD described above.

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

[0157] Also, in the present embodiment, the cross-sectional area of the winding for each of the plurality of phases may be 1.75 mm 2 or more.

[0158] Thereby, even in a structure where the cross-sectional area of the winding is relatively large and the distance between the first winding portion and the second winding portion is more likely to be closer, the inter-winding capacitance between the first winding portion and the second winding portion can be made relatively small.

[0159] Also, in the present embodiment, the air conditioner may be provided with the above-described power conversion device. The air conditioner is, for example, the air conditioner 100 described above.

[0160] Thereby, the power conversion device can suppress the radiated noise 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.

Description of Reference Numerals

[0162] 10 Magnetic core 20 Core case 30 Partition portion 31 Partition plate 40 Winding 41, 42 Winding portions 50, 60 Lead wires 70 Protrusion member 72 Partition plate 74,76 pipe member 100 air conditioner 110 outdoor unit 110H housing 113 compressor 113M 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 lines L_S power line L_S1~L_S5 power lines L_T power line L_T1~L_T5 power lines PS commercial power supply

Claims

1. A noise filter including a choke coil, wherein the choke coil includes: an annular member formed of a magnetic material; an annular case portion for housing the annular member; a plurality of-phase windings wound around the annular member from above the case portion so as to form an overlapping layer with respect to the annular member; a first member having insulation property and partitioning a first space inside the inner circumference of the case portion into second spaces for each phase of the windings; a second member having insulation property and maintaining a distance between a first winding portion corresponding to the first turn from one end of the winding and a second winding portion corresponding to the first turn from the other end of the winding to be relatively large with respect to a predetermined standard in each of the second spaces; and when a distance corresponding to the distance is d, a diameter of an electric wire of the winding is φ, and a height of the case portion is h, the distance satisfies the following formula: 【Number 1】 the first member includes a plurality of partition plates arranged at different circumferential positions in the first space and connecting a radially central portion and the inner circumference of the case portion along the radial direction; the second member partitions only a partial range starting from a central portion in the entire radial range in the second space in the circumferential direction by protruding radially outward from the radially central portion of the first member for each of the second spaces; a power conversion device.

2. In each of the second spaces, 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.

3. In each of the second spaces, 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 2.

4. The second member is formed of the same material as the case portion or the first member. The power conversion device according to any one of claims 1 to 3.

5. Comprising a switching device driven at a switching frequency of 20 kHz or more. The power conversion device according to any one of claims 1 to 3.

6. The cross-sectional area of the winding for each of the plurality of phases is 1.75 mm ２ or more. The power conversion device according to any one of claims 1 to 3.

7. An air conditioner comprising the power conversion device according to any one of claims 1 to 3 Air conditioner

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