CN213185875U

CN213185875U - Power factor correction circuit, circuit board and air conditioner

Info

Publication number: CN213185875U
Application number: CN202022338149.4U
Authority: CN
Inventors: 黄招彬; 徐锦清; 岑长岸; 谢鸣静; 杨土权; 赵鸣
Original assignee: GD Midea Air Conditioning Equipment Co Ltd; Chongqing Midea Refrigeration Equipment Co Ltd
Current assignee: GD Midea Air Conditioning Equipment Co Ltd; Chongqing Midea Refrigeration Equipment Co Ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2021-05-11
Anticipated expiration: 2030-10-16

Abstract

The utility model provides a power factor correction circuit, circuit board and air conditioner, include: an alternating current input end; a common mode inductor comprising a first winding; the boost rectifying module comprises a power inductor and an energy storage device, wherein the power inductor comprises a second winding; the first winding and the second winding are wound on the same magnetic core, the magnetic core comprises a closed first core body and a semi-open second core body, the opening of the second core body faces the first core body, the first winding is wound on the first core body, and the second winding is wound on the second core body. The utility model discloses with the coiling of first winding on first core, simultaneously with the coiling of second winding on the second core to the opening of second core makes second core and first core can form complete closed magnetic circuit towards first core, because first core and second core can constitute and form a magnetic core, consequently the utility model discloses can reduce the volume of magnetic core to reduce the area occupied of power factor correction circuit on the circuit board.

Description

Power factor correction circuit, circuit board and air conditioner

Technical Field

The utility model relates to a magnetism integrated technology field especially relates to a power factor correction circuit, circuit board and air conditioner.

Background

At present, various filters, transformers and inductors are widely applied in the application fields of power electronic power conversion, variable frequency air conditioning systems and the like. The common-mode inductor mainly plays roles in compensating stray capacitive current, filtering harmful subharmonics in a power system and the like; the power inductor is an important magnetic device for realizing direct current voltage conversion filtering. However, in the conventional power factor correction circuit, the power inductor and the common mode inductor are two independent magnetic devices, and the total volume of the magnetic devices is large, so that the occupied area of the magnetic devices on the circuit board is large, and the miniaturization of the product is not facilitated.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a power factor correction circuit, circuit board and air conditioner can reduce the area occupied of power factor correction circuit on the circuit board.

According to the utility model discloses a power factor correction circuit of first aspect embodiment includes:

an alternating current input terminal for inputting an alternating current signal;

the common-mode inductor is used for filtering common-mode noise and harmonic interference of the alternating current signal, is connected to the alternating current input end and comprises a first winding;

the boost rectifying module is connected to the common-mode inductor and comprises a power inductor and an energy storage device, the power inductor is used for charging the energy storage device, and the power inductor comprises a second winding;

the first winding and the second winding are wound on the same magnetic core, the magnetic core comprises a first core body in a closed shape and a second core body in a half-open shape, an opening of the second core body faces the first core body, the first winding is wound on the first core body, and the second winding is wound on the second core body.

According to the utility model discloses power factor correction circuit has following beneficial effect at least: in power factor correction circuit, the embodiment of the utility model provides a can be with the first winding coiling of common mode inductance on being the first core of closed shape, can be simultaneously with the second winding coiling of the power inductance in the rectifier module that steps up on being the second core of half open-ended shape to the opening of second core makes second core and first core can form complete closed magnetic circuit towards first core, because first core and second core can constitute and form a magnetic core, consequently, the embodiment of the utility model provides a can reduce the volume of magnetic core to reduce the area occupied of power factor correction circuit on the circuit board.

According to some embodiments of the present invention, the first core includes four side columns, four the side columns are connected in sequence and surround the first core, the first winding is wound on at least one of the side columns.

According to the utility model discloses a some embodiments, first core includes first center pillar and four side posts, four the side post connects gradually and encloses into first core, first winding coiling is in on the first center pillar or the coiling is in first center pillar both sides on the side post or the coiling is in first center pillar is with one side on the side post.

According to some embodiments of the invention, the first core is provided with a plurality of sections of air gaps.

According to some embodiments of the invention, the second winding is wound in the middle of the second core and/or at least one end of the second core.

According to the utility model discloses a some embodiments, the second core is provided with the second center pillar, the power inductance includes single power inductance, double-circuit power inductance or three routes power inductance.

According to some embodiments of the invention, the second core is provided with a plurality of sections of air gaps.

According to some embodiments of the invention, the second center pillar is provided with a plurality of sections of air gaps.

According to some embodiments of the invention, the first cross-sectional area of the second core is equal, and the second cross-sectional area of the second center pillar is greater than or equal to the first cross-sectional area and less than or equal to twice the first cross-sectional area.

According to some embodiments of the present invention, the transformer further comprises a coupling inductor, the coupling inductor comprises a third winding, and the third winding is wound on the second core.

According to the circuit board of the second aspect embodiment of the present invention, the power factor correction circuit comprises the power factor correction circuit as described in the above first aspect.

According to the utility model discloses circuit board has following beneficial effect at least: in power factor correction circuit, the embodiment of the utility model provides a can be with the first winding coiling of common mode inductance on being the first core of closed shape, can be simultaneously with the second winding coiling of the power inductance in the rectifier module that steps up on being the second core of half open-ended shape to the opening of second core makes second core and first core can form complete closed magnetic circuit towards first core, because first core and second core can constitute and form a magnetic core, consequently, the embodiment of the utility model provides a can reduce the volume of magnetic core to reduce the area occupied of power factor correction circuit on the circuit board.

An air conditioner according to an embodiment of the third aspect of the present invention includes the power factor correction circuit as described in the above first aspect or the circuit board as described in the above second aspect.

According to the utility model discloses air conditioner has following beneficial effect at least: in power factor correction circuit, the embodiment of the utility model provides a can be with the first winding coiling of common mode inductance on being the first core of closed shape, can be simultaneously with the second winding coiling of the power inductance in the rectifier module that steps up on being the second core of half open-ended shape to the opening of second core makes second core and first core can form complete closed magnetic circuit towards first core, because first core and second core can constitute and form a magnetic core, consequently, the embodiment of the utility model provides a can reduce the volume of magnetic core to reduce the area occupied of power factor correction circuit on the circuit board.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic diagram of a power factor correction circuit according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a power factor correction circuit according to another embodiment of the present invention;

fig. 3 is a schematic diagram of a power factor correction circuit according to another embodiment of the present invention;

fig. 4 is a schematic diagram of a power factor correction circuit according to another embodiment of the present invention;

fig. 5 is a schematic diagram of a power factor correction circuit according to another embodiment of the present invention;

fig. 6 is a schematic diagram of a power factor correction circuit according to another embodiment of the present invention;

fig. 7 is a schematic diagram of a power factor correction circuit according to another embodiment of the present invention;

fig. 8 is a schematic diagram of a power factor correction circuit according to another embodiment of the present invention;

fig. 9 is a schematic diagram of a power factor correction circuit according to another embodiment of the present invention;

fig. 10 is a schematic diagram of a power factor correction circuit according to another embodiment of the present invention;

fig. 11 is a schematic diagram of a power factor correction circuit according to another embodiment of the present invention;

fig. 12 is a schematic structural diagram of a first core according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of a first core according to another embodiment of the present invention;

fig. 14 is a schematic structural diagram of a first core according to another embodiment of the present invention;

fig. 15 is a schematic structural diagram of a second core according to an embodiment of the present invention;

fig. 16 is a schematic structural diagram of a second core according to another embodiment of the present invention;

fig. 17 is a schematic structural diagram of a second core according to another embodiment of the present invention;

fig. 18 is a schematic structural diagram of a second core according to another embodiment of the present invention;

fig. 19 is a schematic structural diagram of a second core according to another embodiment of the present invention;

fig. 20 is a schematic structural diagram of a second core according to another embodiment of the present invention;

fig. 21 is a schematic structural diagram of a second core according to another embodiment of the present invention;

fig. 22 is a schematic structural diagram of a second core according to another embodiment of the present invention;

fig. 23 is a schematic structural diagram of a second core according to another embodiment of the present invention;

fig. 24 is a schematic structural view of a second core according to another embodiment of the present invention;

fig. 25 is a schematic structural diagram of a second core according to another embodiment of the present invention;

fig. 26 is a schematic structural diagram of a magnetic core according to an embodiment of the present invention;

fig. 27 is a schematic structural diagram of a magnetic core according to another embodiment of the present invention;

fig. 28 is a schematic structural diagram of a magnetic core according to another embodiment of the present invention;

fig. 29 is a schematic structural diagram of a magnetic core according to another embodiment of the present invention;

fig. 30 is a schematic structural diagram of a magnetic core according to another embodiment of the present invention;

fig. 31 is a schematic structural diagram of a magnetic core according to another embodiment of the present invention;

fig. 32 is a schematic structural diagram of a magnetic core according to another embodiment of the present invention;

fig. 33 is a schematic structural diagram of a magnetic core according to another embodiment of the present invention;

fig. 34 is a schematic structural diagram of a magnetic core according to another embodiment of the present invention;

fig. 35 is a schematic structural diagram of a magnetic core according to another embodiment of the present invention;

fig. 36 is a schematic structural diagram of a magnetic core according to another embodiment of the present invention;

fig. 37 is a schematic structural diagram of a magnetic core according to another embodiment of the present invention;

fig. 38 is a schematic control timing diagram of a switching device according to an embodiment of the present invention;

fig. 39 is a schematic control timing diagram of a switching device according to another embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.

The embodiment of the utility model provides a power factor correction circuit, circuit board and air conditioner, wherein, power factor correction circuit includes alternating current input end, common mode inductance and boost rectifier module, wherein, alternating current input end is used for inputing the alternating current signal; the common-mode inductor is used for filtering common-mode noise and harmonic interference of the alternating current signal, connected to the alternating current input end and comprises a first winding; the boost rectifying module is connected to the common-mode inductor and comprises a power inductor and an energy storage device, the power inductor is used for charging the energy storage device, and the power inductor comprises a second winding; in addition, the first winding and the second winding are wound on the same magnetic core, the magnetic core comprises a closed first core body and a semi-open second core body, the opening of the second core body faces the first core body, the first winding is wound on the first core body, and the second winding is wound on the second core body. According to the utility model discloses technical scheme, in power factor correction circuit, the embodiment of the utility model provides a can be with the first winding coiling of common mode inductance on being the first core of closed shape, can be simultaneously with the second winding coiling of the power inductance in the rectifier module that steps up on being the second core of half open-ended shape to the opening of second core makes second core and first core can form complete closed magnetic circuit towards first core, because first core and second core can constitute and form a magnetic core, consequently, the embodiment of the utility model provides a can reduce the volume of magnetic core to reduce the area occupied of power factor correction circuit on the circuit board.

The embodiments of the present invention will be further explained with reference to the drawings.

As shown in fig. 1 to 11, fig. 1 to 11 are schematic structural diagrams of power factor correction circuits according to some embodiments of the present invention. The power factor correction circuit includes, but is not limited to, an ac input terminal, a common mode inductor, and a boost rectifier module.

Specifically, the ac input terminal is used for inputting an ac signal; the common-mode inductor is used for filtering common-mode noise and harmonic interference of the alternating current signal, connected to the alternating current input end and comprises a first winding; the boost rectifying module is connected to the common mode inductor, and the boost rectifying module comprises a power inductor and an energy storage device, wherein the power inductor is used for charging the energy storage device, and the power inductor comprises a second winding.

In addition, as shown in fig. 26 to 37, fig. 26 to 37 are schematic structural diagrams of the magnetic core according to some embodiments of the present invention. The first winding 200 and the second winding 400 may be wound around the same magnetic core, wherein the magnetic core includes a first core 100 in a closed shape and a second core 300 in a half-open shape, the first core 100 is provided with a first side pillar 110, an opening of the second core 300 faces the first side pillar 110, the first winding 200 is wound around the first core 100, and the second winding 400 is wound around the second core 300.

In an embodiment, to the power factor correction circuit, the embodiment of the present invention can wind the first winding 200 of the common mode inductor on the first core 100 in the closed shape, and simultaneously can wind the second winding 400 of the power inductor in the boost rectifier module on the second core 300 in the half-open shape, and the opening of the second core 300 makes the second core 300 and the first core 100 form a complete closed magnetic circuit towards the first core 100, because the first core 100 and the second core 300 can form a magnetic core, therefore, the embodiment of the present invention can reduce the volume of the magnetic core, thereby reducing the occupied area of the power factor correction circuit on the circuit board.

It should be noted that, as for the ac input terminal in the above-mentioned pfc circuit, it may be a single-phase ac input terminal, as shown in fig. 7 to 9; three-phase ac inputs are also possible, as shown in fig. 1 to 6, 10 and 11.

When the ac input terminal is a single-phase ac input terminal, the power factor correction circuit is correspondingly provided with a phase line and a neutral line, correspondingly, the common mode inductor can refer to LF in fig. 7 to 9, the first winding 200 of the common mode inductor includes two coils, and the two coils are respectively provided on the phase line and the neutral line.

When the ac input terminal is a three-phase ac input terminal, the power factor correction circuit may set a neutral line, as shown in fig. 1, 3 and 5; the centerline may also be eliminated as shown in fig. 2, 4, 6, 10 and 11. In the case that the power factor correction circuit is provided with a neutral line, the power factor correction circuit is correspondingly provided with three phase lines and one neutral line, correspondingly, the common mode inductor can refer to LF in fig. 1, 3 and 5, the first winding 200 of the common mode inductor includes four coils, and the four coils are respectively arranged on the three phase lines and the one neutral line. In the case that the power factor correction circuit is not provided with a neutral line, the power factor correction circuit is correspondingly provided with three phase lines, correspondingly, the common mode inductor can refer to LF in fig. 2, 4, 6, 10 and 11, the first winding 200 of the common mode inductor includes three coils, and the three coils are respectively arranged on the three phase lines.

It can be understood that the common mode inductor is an effective component against electromagnetic interference, and is widely applied to various filters, switching power supplies and other products, wherein the common mode inductor is used for suppressing the common mode interference, and has a suppression effect on a large inductance presented by a common mode signal, and hardly works on a small leakage inductance presented by a differential mode signal. The principle is that when a common mode current flows, magnetic fluxes in the magnetic rings are mutually superposed, so that the magnetic fluxes have a considerable inductance value, the common mode current is restrained, and when a differential mode current flows, the magnetic fluxes in the magnetic rings are mutually offset, so that almost no inductance value exists, and the differential mode current can pass through without attenuation. Therefore, the common-mode inductor can effectively restrain common-mode interference signals in a balanced line, and differential-mode signals normally transmitted by the line are not affected.

In addition, as for the Boost rectifying module in the power factor correction circuit, a rectifying module and a one-way Boost circuit may be included, as shown in fig. 1, fig. 2 and fig. 7; the power supply can also comprise a rectifying module and two Boost voltage-boosting circuits, as shown in fig. 3, 4 and 8; the three-way Boost circuit can also comprise a rectifying module and a three-way Boost circuit, as shown in fig. 5, 6 and 9; it may also be a two-level circuit, as shown in FIG. 10; it may also be a T-type three-level wiener circuit, as shown in fig. 11.

It can be understood that, regarding the power inductor in the boost rectifier module, the power inductor is mainly used for charging the energy storage device of the later stage; wherein, the power inductor may refer to L1 in fig. 1, 2 and 7, or L1 and L2 in fig. 3, 4 and 8, or L1, L2 and L3 in fig. 5, 6 and 9 to 11; in addition, the energy storage device may be a capacitor, and may refer to C2 and C3 in fig. 1 to 2, or C2, C3, C5, and C6 in fig. 3 to 4, or C2, C3, C5, C6, C8, and C9 in fig. 5 to 6, or C2 in fig. 7, or C2 and C4 in fig. 8, or C2, C4, and C6 in fig. 9, or C1 and C2 in fig. 10 to 11.

As shown in fig. 12 to 14 and 26 to 37, the first core 100 includes four side legs, which are sequentially connected and surround the first core 100, and the first winding 200 is wound on at least one side leg.

In one embodiment, the first core 100 having the closed shape includes, but is not limited to, a first side column 110, a second side column 120, a third side column 130, and a fourth side column 140, and the first side column 110, the second side column 120, the third side column 130, and the fourth side column 140 are sequentially arranged to surround the first core 100.

Referring to fig. 13, 14, and 32 to 37, the first core 100 further includes a first center leg 150, wherein the first center leg 150 is located at a middle position of the first core 100, one end of the first center leg 150 is directed to the first side leg 110, and the other end is directed to the third side leg 130. Specifically, in the case that the first core 100 is provided with the first center leg 150, the first winding 200 is wound around the first core 100 in three winding manners including, but not limited to, the following three winding manners:

the first winding mode is as follows: the first winding 200 is wound on the first center leg 150. In the case where the first winding 200 is wound around the first center leg 150, the widths of the second side leg 120 and the fourth side leg 140 of the first core 100 can be reduced on the premise that the same magnetic flux is satisfied, so that the volume of the circuit can be further reduced.

The second winding mode is as follows: the first winding 200 is wound around the side legs at both sides of the first center leg 150. Illustratively, in the case where the first winding 200 includes two coils, one of the coils may be wound around the first side leg 110 between the first center leg 150 and the second side leg 120, may be wound around the second side leg 120, and may be wound around the third side leg 130 between the first center leg 150 and the second side leg 120; and the other coil may be wound around the first side post 110 between the first center post 150 and the fourth side post 140, or the third side post 130 between the first center post 150 and the fourth side post 140. With this winding method, since the common mode inductor is wound around the side legs and the first center leg 150 can provide a magnetic circuit, a part of the magnetic signal is not cancelled without going through the side legs, thereby generating a differential mode component in the first center leg 150; due to the generation of the differential mode component, the capacitance value of the filter capacitor in the EMI filter loop, which may be Cx and Cy in fig. 1 to 6, 10 and 11, may be reduced.

The third winding mode is as follows: the first winding 200 is wound around the side legs on the same side of the first center leg 150. For example, in the case that the first winding 200 includes two coils, the two coils may be wound on the first side leg 110 between the first center leg 150 and the second side leg 120, may be wound on the second side leg 120, and may be wound on the third side leg 130 between the first center leg 150 and the second side leg 120; alternatively, the two coils may be wound around the first side post 110 between the first center post 150 and the fourth side post 140, or the third side post 130 between the first center post 150 and the fourth side post 140.

In addition, the first core 100 is provided with several segments of air gaps 500. The air gap 500 may be provided on the first side pillar 110, the second side pillar 120, the third side pillar 130, the fourth side pillar 140, or the first center pillar 150. The embodiment of the utility model provides a set up a plurality of sections air gaps 500 on first core 100 and can reduce the holistic magnetic permeability of first core 100, make line Wei characteristic rely on magnetic core material's initial permeability less. The air gap 500 can avoid magnetic saturation under large ac signals or dc bias to better control inductance. Specifically, the number of air gaps 500 may be single or multiple segments.

When it is required to provide the single-stage air gap 500, the single-stage air gap 500 may be provided on the first side pillar 110, the second side pillar 120, the third side pillar 130, the fourth side pillar 140, or the first center pillar 150. The single-segment air gap 500 is disposed on the first side pillar 110, the second side pillar 120, the third side pillar 130, or the fourth side pillar 140, which is more convenient to manufacture than the single-segment air gap 500 is disposed on the first center pillar 150.

When the air gap 500 having a single-stage width L is divided into a plurality of air gaps 500 having a smaller width and respectively disposed on two opposite side pillars, the volume of the first core 100 can be reduced as compared to the air gap 500 having a single-stage width L disposed on a single side pillar. Illustratively, in the first case, the second leg 120 is provided with the air gap 500 having a single-step width L, in the second case, the second leg 120 is provided with the air gap 500 having a single-step width L/2, and the fourth leg 140 is provided with the air gap 500 having a single-step width L/2, although the total width of the air gap 500 is the same in both cases, the height of the first core 100 in the first case is higher than the height of the first core 100 in the second case by L/2.

When the air gap 500 with a plurality of sections of smaller widths is arranged, leakage inductance can be reduced, eddy current loss can be reduced, and magnetic interference on the periphery of the magnetic core can be reduced. For example, the whole magnetic circuit formed by a segment of the air gap 500 can be regarded as a sphere, wherein the magnetic circuit leaking into the air outside the air gap 500 without passing through the air gap 500 is leakage flux. Therefore, if the single-section air gap 500 with the width L is divided into multiple sections of air gaps 500 with smaller widths, the volume of the sphere corresponding to the single-section air gap 500 with the width L is larger than the total volume of the multiple spheres corresponding to the multiple sections of air gaps 500 with smaller widths, and therefore, the multiple sections of air gaps 500 can achieve the effects of reducing magnetic leakage, eddy current loss and magnetic interference on the periphery of the magnetic core.

In addition, in the case where the air gap 500 is not provided in the first core 100, the material of the first core 100 may be a ferrite core.

Referring to fig. 15 to 37, for the second winding 400 on the second core 300, the second winding 400 may be wound at any position on the second core 300, and the second winding 400 is wound in the middle of the second core 300 and/or at least one end of the second core 300.

In one embodiment, the second core 300 having a half-opened shape includes, but is not limited to, a fifth side column 310, a sixth side column 320, and a seventh side column 330, wherein the fifth side column 310 and the seventh side column 330 are respectively disposed at both ends of the sixth side column 320. The second winding 400 may be wound on at least one of the fifth side leg 310, the sixth side leg 320, and the seventh side leg 330.

As shown in fig. 19 to 25 and 29 to 34, the second core 300 is provided with a second center leg 340, and the power inductor includes a one-way power inductor, a two-way power inductor, or a three-way power inductor. The winding manner of the second winding 400 wound on the second core 300 may include, but is not limited to, the following:

the first winding mode is as follows: when the boost rectifier module includes a single-circuit power inductor, the second winding 400 includes a coil, and the coil is wound on the second center pillar 340. When the coil is wound around the second center leg 340, the widths of the fifth side leg 310 and the seventh side leg 330 of the second core 300 can be reduced on the premise that the same magnetic flux is satisfied, so that the volume of the circuit can be further reduced. Of course, in the case where the second center leg 340 is provided, the coil may still be wound on the fifth side leg 310, the sixth side leg 320, or the seventh side leg 330, instead of the second center leg 340.

The second winding mode is as follows: when the boost rectifier module includes a dual-path power inductor, correspondingly, the second winding 400 includes two coils, and the two coils are wound on the second center pillar 340 or wound at two ends of the second core 300 respectively. In the case where both coils are wound around the second center leg 340, the widths of the fifth side leg 310 and the seventh side leg 330 in the second core 300 can be reduced on the premise that the same magnetic flux is satisfied, so that the volume of the circuit can be further reduced. Of course, in the case where the second center leg 340 is provided, two coils may be wound not on the second center leg 340 but on at least one of the fifth, sixth, and

seventh side legs

310, 320, 330. When the two coils are not wound on the second center leg 340 but are wound on the fifth side leg 310 and the seventh side leg 330, respectively, the winding is more convenient.

The third winding mode is as follows: when the boost rectifier module includes three power inductors, correspondingly, the second winding 400 includes three coils, and the three coils are wound on the second center pillar 340 or wound on two ends of the second core 300 and the second center pillar 340 respectively. In the case where three coils are wound around the second center leg 340, the widths of the fifth side leg 310 and the seventh side leg 330 in the second core 300 can be reduced on the premise that the same magnetic flux is satisfied, so that the volume of the circuit can be further reduced. Of course, three coils may be wound on the fifth, second and

seventh side legs

310, 340 and 330, respectively.

In one embodiment, the second core 300 is provided with segments of air gaps 500. Specifically, the air gap 500 may be provided on the fifth side pillar 310, the sixth side pillar 320, or the seventh side pillar 330.

It is understood that, in the case where the second core 300 is provided with the second center leg 340, the second center leg 340 may be provided with several stages of air gaps 500.

The embodiment of the utility model provides a set up a plurality of sections air gaps 500 on second core 300 and can reduce the holistic magnetic permeability of second core 300, make line Wei characteristic rely on magnetic core material's initial permeability less. The air gap 500 can avoid magnetic saturation under large ac signals or dc bias to better control inductance. Specifically, the number of air gaps 500 may be single or multiple segments.

When it is required to provide the single-stage air gap 500, the single-stage air gap 500 may be provided on the fifth side column 310, the sixth side column 320, the seventh side column 330, or the second center column 340. Providing the single-piece air gap 500 on the fifth side leg 310, the sixth side leg 320, or the seventh side leg 330 may facilitate manufacturing as compared to providing the single-piece air gap 500 on the second center leg 340.

When the air gap 500 having a single-stage width L is divided into a plurality of air gaps 500 having a smaller width and disposed at the fifth side pillar 310 and the seventh side pillar 330, respectively, the volume of the second core 300 can be reduced as compared to the air gap 500 having a single-stage width L disposed at the fifth side pillar 310, the second center pillar 340, or the seventh side pillar 330. Illustratively, in the first case, the fifth side column 310 is provided with the air gap 500 having a single-step width L, in the second case, the fifth side column 310 is provided with the air gap 500 having a single-step width L/2 and the seventh side column 330 is provided with the air gap 500 having a single-step width L/2, although the total width of the air gap 500 is the same in both cases, the height of the second core 300 in the first case is higher than the height of the second core 300 in the second case by L/2.

When the air gap 500 with a plurality of sections of smaller widths is arranged, leakage inductance can be reduced, eddy current loss can be reduced, and magnetic interference on the periphery of the magnetic core can be reduced. For example, the whole magnetic circuit formed by a segment of the air gap 500 can be regarded as a sphere, wherein the magnetic circuit leaking into the air without passing through the air gap 500 is leakage flux. Therefore, if the single-section air gap 500 with the width L is divided into multiple sections of air gaps 500 with smaller widths, the volume of the sphere corresponding to the single-section air gap 500 with the width L is larger than the total volume of the multiple spheres corresponding to the multiple sections of air gaps 500 with smaller widths, and therefore, the multiple sections of air gaps 500 can achieve the effects of reducing magnetic leakage, eddy current loss and magnetic interference on the periphery of the magnetic core.

It should be noted that the first cross-sectional areas of both ends of the second core 300 are equal, and the second cross-sectional area of the second center leg 340 is greater than or equal to the first cross-sectional area and less than or equal to twice the first cross-sectional area.

In addition, the utility model discloses power factor correction circuit still includes the coupling inductance, and the coupling inductance includes the third winding, and the third winding coiling is on second core 300.

In an embodiment, a current signal of a direct current output end of the boost rectifier module can be acquired through the coupling inductor, the acquired current signal is sent to the controller, and then the controller can control the switching device in the boost rectifier module to be switched on or switched off according to the acquired current signal.

It should be noted that, for the first core 100 described above, the embodiment of the present invention only illustrates a partial schematic diagram of the first winding 200 wound on the first core 100 when the ac input terminal is a three-phase ac input terminal and the power factor correction circuit is provided with a neutral line, as shown in fig. 12 to 14. It is understood that the first winding 200 may be selectively wound on the first side leg 110 or the third side leg 130, and thus, will not be described herein. In addition, for the case that the ac input terminal is a single-phase ac input terminal, or for the case that the ac input terminal is a three-phase ac input terminal and the power factor correction circuit is not provided with a neutral line, the manner in which the first winding 200 is wound around the first core 100 can be referred to above, and will not be described herein again.

Next, for the second core 300, the embodiment of the present invention only illustrates a partial schematic view that the second winding 400 is wound on the second core 300 in the case of the single-path power inductor, as shown in fig. 15 to 25. It is understood that the second winding 400 may be wound on the fifth side leg 310 or the seventh side leg 330 without the second center leg 340. Alternatively, in the case where the second center leg 340 is provided, the second winding 400 may be wound around the fifth side leg 310, the sixth side leg 320, or the seventh side leg 330. In addition, for the case of two-way power inductor or three-way power inductor, the manner of winding the second winding 400 around the second core 300 may refer to the above description, and is not described herein again.

In addition, for the above-mentioned magnetic core, the embodiment of the present invention only lists the schematic diagrams of the magnetic core in the case that the ac input terminal is a three-phase ac input terminal, the power factor correction circuit is provided with a neutral line, and only the single-path power inductor is provided, as shown in fig. 26 to fig. 37. For the case that the ac input terminal is a single-phase ac input terminal or the ac input terminal is a three-phase ac input terminal, and the power factor correction circuit is not provided with a neutral line and two or three power inductors, the manner in which the first winding 200 and the second winding 400 are wound around the magnetic core may be referred to as shown above, and details thereof are not repeated herein.

It should be noted that, the switching timings of the switching tubes in the pfc circuit, such as Q1 to Q6, can be shown in fig. 38 and fig. 39, the switching period is T, and the switching timings of the switching tubes Q1 to Q6 are different by [0, T/N ], where N denotes a multiple interleaved Boost circuit, and exemplarily, when the two-way interleaved Boost circuit is used, N is 2; when the three-way interleaved Boost circuit is used, N is 3.

Fig. 38 is a two-way interleaved PFC switching timing diagram, the difference between the switching timing of Q1 and the switching timing of Q2 is T/2, and the on duty ratio has three states; fig. 39 is a timing diagram of three-way interleaved PFC switching, where the switching timing phase difference between Q1 and Q2 and Q3 is T/3, and the on duty cycle has three states; other paths are analogized in sequence, the switching time sequence difference of Q1 … QN is T/N, the larger N is, the closer T/N is to 0, and the switching time sequence difference is [0, T/N ].

Based on above-mentioned power factor correction circuit, provide respectively below the utility model discloses a circuit board and each embodiment of air conditioner.

In addition, an embodiment of the present invention further provides a circuit board, including but not limited to the power factor correction circuit of any of the above embodiments.

Because the utility model discloses the circuit board includes the power factor correction circuit as above-mentioned any embodiment, consequently, the utility model discloses the circuit board possesses the technological effect that the power factor correction circuit brought as above-mentioned any embodiment, so, the utility model discloses a concrete technological effect of circuit board can refer to the technological effect of the power factor correction circuit of above-mentioned any embodiment.

In addition, an embodiment of the present invention further provides an air conditioner, including but not limited to the power factor correction circuit of any of the above embodiments or the circuit board of the above embodiments.

Because the utility model discloses the air conditioner includes the power factor correction circuit or the circuit board of above-mentioned embodiment as above-mentioned any one embodiment, consequently, the utility model discloses an air conditioner is equipped with the power factor correction circuit as above-mentioned any one embodiment or the technical effect that the circuit board brought as above-mentioned embodiment, so, the specific technical effect of the air conditioner of the utility model, can refer to the technical effect of the power factor correction circuit of above-mentioned any one embodiment or the circuit board of above-mentioned embodiment.

While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.

Claims

1. A power factor correction circuit, comprising:

2. The power factor correction circuit of claim 1, wherein: the first core comprises four side columns which are sequentially connected and surround the first core, and the first winding is wound on at least one side column.

3. The power factor correction circuit of claim 1, wherein: the first core comprises a first middle column and four side columns, the four side columns are sequentially connected and wound into the first core, the first winding is wound on the first middle column or wound on the side columns on two sides of the first middle column or wound on the side columns on the same side of the first middle column.

4. The power factor correction circuit according to any one of claims 1 to 3, wherein: the first core is provided with a plurality of sections of air gaps.

5. The PFC circuit of claim 1, wherein the second winding is wound around a middle portion of the second core and/or around at least one end of the second core.

6. The power factor correction circuit of claim 1, wherein the second core is provided with a second center leg, and the power inductor comprises a single-way power inductor, a two-way power inductor, or a three-way power inductor.

7. The power factor correction circuit of claim 1, wherein: the second core is provided with a plurality of sections of air gaps.

8. The power factor correction circuit of claim 6, wherein: the second center pillar is provided with a plurality of sections of air gaps.

9. The power factor correction circuit of claim 6 or 8, wherein: first cross-sectional areas of both ends of the second core are equal, and a second cross-sectional area of the second center leg is greater than or equal to the first cross-sectional area and less than or equal to twice the first cross-sectional area.

10. The power factor correction circuit of claim 1, wherein: the coupling inductor comprises a third winding, and the third winding is wound on the second core body.

11. A circuit board, characterized by: comprising a power factor correction circuit according to any of claims 1 to 10.

12. An air conditioner, characterized in that: comprising a power factor correction circuit according to any of claims 1 to 10 or a circuit board according to claim 11.