Inversion inductor and inverter

Abstract

The utility model relates to the field of non-linear inductors, discloses an inverter inductor and an inverter, and aims to solve the problems that in the prior art, harmonic waves under light loads cannot be improved due to the fact that the inductance value under light loads is difficult to independently pull up under the condition that the inductance value under heavy loads is difficult to keep unchanged after materials of the inverter inductor are determined. According to the technical scheme, the secondary magnet yoke of which the magnetic flux density is smaller than that of the primary magnet yoke is added to be connected with the primary magnet yoke in parallel in the magnetic flux direction, so that the magnetic flux mainly passes through the secondary magnet yoke under the condition that the coil is connected with a light load, and as the magnetic resistance of the secondary magnet yoke is small, the coupling coefficient between the two windings formed by the coil and the middle column is large; therefore, the inductance value of the inversion inductor under the light load is greatly improved. Along with the increase of the load, when the secondary magnet yoke is saturated, the magnetic flux starts to pass through the primary magnet yoke, so that the inductance value of the inversion inductor can keep the nonlinear characteristic of the primary magnet yoke. According to the technical scheme, the sensing value during light load is increased under the condition that the sensing value during heavy load is not changed, and the THDI problem under the light load is effectively solved.

Description

Technical Field

[0001] The utility model relates to the field of nonlinear inductance, in particular to an inverter inductor and an inverter. Background Art

[0002] Photovoltaic inverters are inverters that can convert the variable DC voltage generated by photovoltaic solar panels into AC power at the mains frequency. They can feed the electric energy back to the commercial power transmission system or supply it to off-grid power grids. Photovoltaic inverters are one of the important system balances in photovoltaic array systems and can be used with general AC-powered equipment. Due to the requirements for power quality, the total harmonic distortion rate (THDI) of the current after inversion is generally limited. Inverter inductors are one of the most critical components in photovoltaic inverters. They mainly have the functions of energy storage, boosting, filtering, etc. The filtering function of inverter inductors can effectively improve THDI.

[0003] Inverter inductors in current technology usually adopt a two-column structure. At the same time, in order to cope with DC bias under high power, metal powder core materials with a magnetic permeability of less than 150 are usually selected. The metal powder core material has a high inductance under light load and a lower inductance with heavier load, which can better meet the requirements of THDI under light and heavy loads. However, after the material is determined, it is difficult to increase the inductance under light load while keeping the inductance under heavy load unchanged, and thus it is difficult to improve the THDI under light load.

[0004] It can be seen that how to improve the inductance under light load while ensuring that the inductance under heavy load remains unchanged to achieve better harmonic suppression is a problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] The utility model aims to provide an inverter inductor and an inverter, so as to solve the problem in the current technology that after the material of the inverter inductor is determined, it is difficult to keep the inductance value under heavy load unchanged, and the inductance value under light load is increased alone, resulting in failure to improve the harmonics under light load.

[0006] In order to solve the above technical problems, the utility model provides an inverter inductor, comprising:

[0007] A primary magnetic yoke, a secondary magnetic yoke, a center column, and a coil wound around the center column;

[0008] The center column includes a first center column and a second center column, the primary magnetic yoke includes an upper magnetic yoke and a lower magnetic yoke, the upper magnetic yoke is arranged at the upper ends of the first center column and the second center column, and the lower magnetic yoke is arranged at the lower ends of the first center column and the second center column;

[0009] The secondary magnetic yoke is connected in parallel with at least one of the primary magnetic yokes along the magnetic flux direction;

[0010] The magnetic flux density of the secondary magnetic yoke is smaller than the magnetic flux density of the primary magnetic yoke.

[0011] Preferably, there are multiple secondary magnetic yokes.

[0012] Preferably, the surfaces of the upper magnetic yoke and the lower magnetic yoke are both provided with the secondary magnetic yoke.

[0013] Preferably, all of the secondary yokes are disposed on the surface of the upper yoke or the lower yoke.

[0014] Preferably, the secondary magnetic yoke comprises a first magnetic yoke and a second magnetic yoke;

[0015] The first magnetic yoke is connected in parallel with the upper magnetic yoke along the magnetic flux direction;

[0016] The second magnetic yoke is connected in parallel with the lower magnetic yoke along a magnetic flux direction.

[0017] Preferably, the first magnetic yoke is located on the upper surface of the upper magnetic yoke; and the second magnetic yoke is located on the lower surface of the lower magnetic yoke.

[0018] Preferably, the secondary magnetic yoke includes four magnetic yokes, two of which are arranged on the front and rear surfaces of the upper magnetic yoke, and the other two are arranged on the front and rear surfaces of the lower magnetic yoke.

[0019] Preferably, the secondary magnetic yoke is adhered to the surface of the primary magnetic yoke by glue.

[0020] Preferably, the length of the secondary magnetic yoke along the magnetic flux direction is less than or equal to the length of the primary magnetic yoke.

[0021] In order to solve the above technical problem, the utility model also provides an inverter, including the above inverter inductor.

[0022] The inverter inductor provided by the utility model comprises a primary yoke, a secondary yoke, a middle column and a coil wound on the middle column; the middle column comprises a first middle column and a second middle column, the primary yoke comprises an upper yoke and a lower yoke, the upper yoke is arranged at the upper end of the first middle column and the second middle column, and the lower yoke is arranged at the lower end of the first middle column and the second middle column; the secondary yoke is connected in parallel with at least one yoke of the primary yoke along the magnetic flux direction; the magnetic flux density of the secondary yoke is less than the magnetic flux density of the primary yoke. Compared with the current technology in which the inverter inductor is difficult to maintain the heavy load inductance unchanged after the material is determined, and the inductance under light load is increased alone, resulting in the inability to improve the harmonic under light load, the technical scheme is adopted, the primary yoke is used to connect the middle column, and the secondary yoke with a magnetic flux density less than the magnetic flux density of the primary yoke is connected in parallel with the primary yoke along the magnetic flux direction, so that the magnetic flux of the coil mainly goes through the secondary yoke when the light load is connected, and because the magnetic resistance of the secondary yoke is small, the coupling coefficient between the two windings formed by the coil and the middle column is large, thereby greatly improving the inductance of the inverter inductor under light load. As the load increases, when the secondary yoke is saturated, the magnetic flux begins to flow through the primary yoke, so the inductance of the inverter inductor can maintain the nonlinear characteristics of the primary yoke. Therefore, this technical solution improves the inductance under light load while ensuring that the inductance under heavy load remains unchanged, effectively improving the THDI problem under light load.

[0023] In addition, the inverter provided by the utility model includes the above-mentioned inverter inductor, and the effect is the same as above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A structural diagram of an inverter inductor provided in an embodiment of the utility model;

[0026] Figure 2 A structural diagram of a conventional inverter inductor provided in an embodiment of the utility model;

[0027] Figure 3 A schematic diagram of the position of a secondary magnetic yoke provided in an embodiment of the utility model;

[0028] Figure 4 A schematic diagram of the inductance-current value curve of the embodiment and the comparative example provided by the embodiment of the utility model;

[0029] The reference numerals are as follows: 101 is a first center column, 102 is a second center column, 103 is an upper magnetic yoke, 104 is a lower magnetic yoke, 105 is a first coil, 106 is a second coil, 107 is a first magnetic yoke, and 108 is a second magnetic yoke. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0031] The core of the utility model is to provide an inverter inductor and an inverter, which are used to improve the inductance value under light load while ensuring that the inductance value under heavy load remains unchanged, thereby improving the THDI problem under light load.

[0032] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Figure 1 A structural diagram of an inverter inductor provided in an embodiment of the utility model, such as Figure 1 As shown, the inverter inductor includes:

[0034] A primary magnetic yoke, a secondary magnetic yoke, a center column, and a coil wound around the center column;

[0035] The middle column includes a first middle column 101 and a second middle column 102. Correspondingly, the coil includes a first coil 105 wound on the first middle column 101 and a second coil 106 wound on the second middle column 102. The primary magnetic yoke includes an upper magnetic yoke 103 and a lower magnetic yoke 104. The upper magnetic yoke 103 is arranged at the upper ends of the first middle column 101 and the second middle column 102, and the lower magnetic yoke 104 is arranged at the lower ends of the first middle column 101 and the second middle column 102.

[0036] The secondary magnetic yoke is connected in parallel with at least one of the primary magnetic yokes along the magnetic flux direction;

[0037] The magnetic flux density of the secondary magnetic yoke is smaller than the magnetic flux density of the primary magnetic yoke.

[0038] Photovoltaic inverter is the core device in photovoltaic power generation. It can convert the direct current generated by solar photovoltaic panels into alternating current. However, due to the requirements for power quality during use, the size of THDI after inversion is generally limited. THDI is defined as the ratio of the effective value of the total harmonic current to the effective value of the fundamental current. Inverter inductor is one of the most critical components in photovoltaic inverters. It mainly has the functions of energy storage, boosting, filtering, etc. The filtering function of inverter inductor can effectively improve THDI. In the current technical solution, the inverter inductor usually adopts a two-column inductor structure. At the same time, in order to cope with the DC bias magnetism under high power, the metal magnetic powder core material is selected as the material. The nonlinear characteristics of the metal magnetic powder core material can better take into account the requirements of THDI under light and heavy loads. The inductance superposition curve of the existing inverter inductor is generally determined by the characteristics of the material. The inductance-current curve of the inverter inductor generally depends on the magnetic induction intensity-magnetic field intensity curve of the powder core material. Therefore, after determining the material, it is difficult to ensure that the inductance of the inverter inductor connected to the heavy load remains unchanged and the inductance under light load is improved. For this purpose, the utility model adds a secondary magnetic yoke to increase the inductance of the inverter when connected to a light load.

[0039] Since most inverter inductors in current technology are usually of two-column structure, the inverter inductor provided by the utility model is an improvement on the existing two-column inductor. In this embodiment, the first coil 105 and the second coil 106 are respectively wound on the first middle column 101 and the second middle column 102 to form a winding. In a specific implementation, the winding method of the coil winding can adopt forward coupling winding, and the material of the coil can be copper wire material or aluminum wire material. The primary yoke in this embodiment includes an upper yoke 103 and a lower yoke 104. The upper ends of the first middle column 101 and the second middle column 102 are connected by the upper yoke 103, and the lower ends are connected by the lower yoke 104. The material of the middle column and the primary yoke is usually a metal magnetic powder core with low magnetic permeability (one of FeSi, FeNi, FeSiAl or a mixed material in any proportion). In order to improve the inductance of the inverter when connected to a light load, so that the magnetic flux under light load will preferentially flow through the secondary yoke, when the middle column and the primary yoke are made of FeSi6.5-60u magnetic powder core material, the secondary yoke can be made of PC95 material.

[0040] It is understandable that the idea of ​​the present invention to solve the problem in the current technology is to provide an additional channel so that the inverter inductor takes different channels when connected to light load and heavy load, ensuring the THDI requirement under heavy load while improving the inductance under light load. Therefore, a secondary yoke is added to the present invention, and in order to become an additional channel, the secondary yoke needs to be connected in parallel with the primary yoke along the magnetic flux direction. In a specific application, the number of the secondary yokes may be one or more, so the secondary yoke should be connected in parallel with at least one of the primary yokes along the magnetic flux direction. Since there are two primary yokes, the secondary yoke may be set on the upper yoke 103 or the lower yoke 104, or it may be set on both the upper yoke 103 and the lower yoke 104. It should be noted that the parallel structure referred to in this embodiment requires the secondary yoke to have surface contact with the primary yoke. The parallel connection method refers to the connection relationship between the secondary yoke and the primary yoke in parallel along the magnetic flux direction, rather than the relationship of being connected in sequence along the magnetic flux direction.

[0041] The above-mentioned embodiment introduces that the primary magnetic yoke in the utility model includes an upper magnetic yoke 103 and a lower magnetic yoke 104, and when there are multiple secondary magnetic yokes, they can be connected in parallel only on the upper magnetic yoke 103 or the lower magnetic yoke 104, or they can be connected in parallel on the upper magnetic yoke 103 and the lower magnetic yoke 104 respectively. When arranged on different magnetic yokes, the number of secondary magnetic yokes on the upper magnetic yoke 103 and the lower magnetic yoke 104 can be the same or different.

[0042] In the specific setting, when there are at least two secondary yokes, if both of the secondary yokes are set on the upper yoke 103 or the lower yoke 104, the setting position of the secondary yoke can be set on different surfaces of the same yoke according to the space size, for example, one is set on the upper surface of the upper yoke 103, and the other is on the front / rear surface of the upper yoke 103. If the secondary yokes are respectively set on the upper yoke 103 and the lower yoke 104, the secondary yokes can be symmetrically distributed on the upper yoke 103 and the lower yoke 104, for example, one secondary yoke is set on the upper surface of the upper yoke 103, and the other secondary yoke is set on the lower surface of the lower yoke 104. Of course, it can also be asymmetrical, for example, one secondary yoke is set on the upper surface of the upper yoke 103, and the other secondary yoke is set on the front / rear surface of the lower yoke 104.

[0043] In order to ensure the THDI requirement under heavy load and achieve current harmonic suppression under light load, the magnetic flux needs to take the secondary yoke channel first when the inverter inductor is connected to the light load, so the magnetic flux density of the secondary yoke should be less than the magnetic flux density of the primary yoke. In order to achieve this effect, when setting the cross-sectional area of ​​the secondary yoke, the following requirements should be met: the magnetic flux density of the lower yoke 104 includes Bac (AC magnetic flux) and Bdc (DC magnetic flux), Bac (AC magnetic flux) = UL (inductor terminal voltage) * D (duty cycle) / f (switching frequency) * N (number of turns) * Ae (cross-sectional area); Bdc (DC magnetic flux) is consistent with the Bdc of the powder core, and the calculation method of the Bdc of the powder core is H (magnetic field strength) = N (number of turns) * I (current) / Le (powder core magnetic path length), and Bdc is obtained by querying the magnetic induction intensity-magnetic field intensity curve, Bac + Bdc < Bs (saturation magnetic flux density of the secondary yoke). Among them, I is the current value corresponding to the light load that is expected to be improved, and Ae refers to the area of ​​the cross section perpendicular to the direction of magnetic flux flow.

[0044] In this embodiment, under light load, since the magnetic flux mainly passes through the parallel secondary yoke, the magnetic resistance is small and the coupling coefficient between the two phases is large, the inductance of the magnetic core is large under light load. As the load increases, the secondary yoke becomes saturated. After the secondary yoke is saturated, the magnetic resistance becomes larger, and the magnetic flux will pass through the primary yoke to follow the magnetic path of low magnetic permeability. Therefore, this embodiment can make the inverter inductance significantly high under light load, and after the secondary yoke is saturated, the nonlinear attenuation characteristics of the primary yoke can be maintained. Such characteristics are reflected in the inductance-current characteristic curve of the inductance, that is, before the secondary yoke is saturated, the inductance is very large, and as the load increases, the inductance decays rapidly; and after the secondary yoke is saturated, the inductance maintains the characteristics of the primary yoke, and the inductance decays slowly; such inductance-current characteristics can better suppress harmonics under light load and can better suppress THDI.

[0045] The inverter inductor provided by the embodiment of the utility model comprises a primary yoke, a secondary yoke, a middle column and a coil wound on the middle column; the middle column comprises a first middle column and a second middle column, the primary yoke comprises an upper yoke and a lower yoke, the upper yoke is arranged at the upper end of the first middle column and the second middle column, and the lower yoke is arranged at the lower end of the first middle column and the second middle column; the secondary yoke is connected in parallel with at least one yoke of the primary yoke along the magnetic flux direction; the magnetic flux density of the secondary yoke is less than the magnetic flux density of the primary yoke. Compared with the current technology in which it is difficult to keep the inductance value of heavy load unchanged after the material of the inverter inductor is determined, the inductance value under light load is increased alone, resulting in the inability to improve the harmonic under light load, the technical solution is adopted, the primary yoke is used to connect the middle column, and the secondary yoke with a magnetic flux density less than the magnetic flux density of the primary yoke is connected in parallel with the primary yoke along the magnetic flux direction, so that the magnetic flux of the coil mainly goes through the secondary yoke when the light load is connected, and the coupling coefficient between the two windings formed by the coil and the middle column is large due to the small magnetic resistance of the secondary yoke, thereby greatly improving the inductance value of the inverter inductor under light load. As the load increases, when the secondary yoke is saturated, the magnetic flux begins to flow through the primary yoke, so the inductance of the inverter inductor can maintain the nonlinear characteristics of the primary yoke. Therefore, this technical solution improves the inductance under light load while ensuring that the inductance under heavy load remains unchanged, effectively improving the THDI problem under light load.

[0046] The above embodiment introduces that the number of the secondary yokes can be single or multiple. When there are multiple secondary yokes, they may all be arranged on one yoke of the primary yoke, or they may be arranged on both yokes. There are also multiple parallel structures of the secondary yoke and the primary yoke. In this embodiment, a specific parallel structure is provided. In this embodiment, the secondary yoke includes a first yoke 107 and a second yoke 108. The first yoke 107 is connected in parallel with the upper yoke 103 along the magnetic flux direction; the second yoke 108 is connected in parallel with the lower yoke 104 along the magnetic flux direction. Specifically, the first yoke 107 is located on the upper surface of the upper yoke 103, and the second yoke 108 is located on the lower surface of the lower yoke 104. In other embodiments, the first yoke 107 may also be arranged on the front or back of the upper yoke 103, and the second yoke 108 may also be arranged on the front surface or back surface of the lower yoke 104. When set, the surfaces where the first magnetic yoke 107 and the second magnetic yoke 108 are located can be the same, for example, the first magnetic yoke 107 is on the front surface of the upper magnetic yoke 103, and the second magnetic yoke 108 is on the front surface of the lower magnetic yoke 104, or they can be different, for example, the first magnetic yoke 107 is on the upper surface of the upper magnetic yoke 103, and the second magnetic yoke 108 is on the front surface of the lower magnetic yoke 104.

[0047] As another embodiment, the secondary magnetic yoke includes four magnetic yokes, two of which are disposed on the front and rear surfaces of the upper magnetic yoke 103 , and the other two are disposed on the front and rear surfaces of the lower magnetic yoke 104 .

[0048] This embodiment also provides another specific parallel structure. In this embodiment, the secondary yokes are all arranged on a primary yoke. In other embodiments, the secondary yoke can be a single one. In this embodiment, it is set to two. The first yoke 107 can be set on the upper surface of the upper yoke 103, and the second yoke 108 is set on the front and rear surfaces of the upper yoke 103. Of course, the first yoke 107 and the second yoke 108 can also be set on the front and rear surfaces of the upper yoke 103 in a symmetrical arrangement.

[0049] In a specific implementation, in order to achieve parallel fixation of the secondary yoke and the primary yoke, ensure the stability of the harmonic suppression effect, and avoid the secondary yoke from falling off, in a specific implementation, the secondary yoke can be glued to the upper yoke 103 by glue, or in other embodiments, the secondary yoke can also be fixed to the surface of the primary yoke by snapping.

[0050] It is understandable that the primary yoke is used to connect the two winding poles, and the secondary yoke is in parallel with the primary yoke, providing a low magnetic resistance channel under light load, and the secondary yoke is saturated under heavy load. Therefore, the length of the secondary yoke along the magnetic flux direction should be less than or equal to the length of the primary yoke. If it is too long, it will waste costs. And this structure can also adapt to the installation space of the current inverter inductor, avoiding the need for additional storage space for the inverter inductor due to the excessively long secondary yoke.

[0051] In order to verify the implementation effect of the utility model, different embodiments and comparative examples are set for verification. Figure 2 A structural diagram of a conventional inverter inductor provided in an embodiment of the utility model, such as Figure 2 As shown, as a common inverter inductor in the current technology, it includes a first middle column 101, a second middle column 102, an upper magnetic yoke 103, a lower magnetic yoke 104, a first coil 105, and a second coil 106. As a specific comparative example, Figure 2 The center column and the upper and lower magnetic yokes are all made of FeSi6.5-60u magnetic powder core material, and the number of coil turns is 14.5 turns for the first winding on the left and 14 turns for the second winding on the right.

[0052] In order to verify the THDI improvement effect of an inverter inductor provided by the utility model, the specific embodiments provided in the utility model should be improved on the basis of the comparative examples, wherein a specific embodiment 1 is as follows Figure 1 As shown, the newly added secondary magnetic yokes are respectively arranged on the upper and lower surfaces of the primary magnetic yoke.

[0053] As another specific embodiment 2: Figure 3 A schematic diagram of the position of a secondary magnetic yoke provided in an embodiment of the utility model, wherein four secondary magnetic yokes are respectively bonded to the front and rear surfaces of the primary magnetic yoke.

[0054] The suppression effects of the embodiments and the comparative examples on the current harmonics in the inverter were tested respectively. The corresponding THDI current is the current waveform after passing through the inverter inductor. The results are shown in Table 1:

[0055] Table 1

[0056]

[0057] Figure 4 The schematic diagram of the inductance-current value curve of the embodiment and the comparative example provided for the embodiment of the utility model. From the experimental results, it can be seen that the inductance of the inverter inductor under light load is significantly increased by adding the secondary magnetic yoke, thereby effectively improving the harmonics under light load, while the inductance under heavy load is basically the same as that of the control group, and the THDI under heavy load is also basically the same. Therefore, the utility model can effectively improve the THDI under light load without sacrificing the THDI under heavy load.

[0058] Finally, this embodiment also provides an inverter, including the above-mentioned inverter inductor.

[0059] The inverter provided in this embodiment includes an inverter inductor, which includes a primary magnetic yoke, a secondary magnetic yoke, a middle column and a coil wound on the middle column; the middle column includes a first middle column and a second middle column, the primary magnetic yoke includes an upper magnetic yoke and a lower magnetic yoke, the upper magnetic yoke is arranged at the upper ends of the first middle column and the second middle column, and the lower magnetic yoke is arranged at the lower ends of the first middle column and the second middle column; the secondary magnetic yoke is connected in parallel with at least one magnetic yoke in the primary magnetic yoke along the magnetic flux direction; the magnetic flux density of the secondary magnetic yoke is less than the magnetic flux density of the primary magnetic yoke. Compared with the current technology, in which it is difficult to keep the inductance value of the inverter under heavy load unchanged after the material is determined, and the inductance value under light load is increased alone, resulting in the inability to improve the harmonics under light load, the present technical solution adopts a primary yoke to connect the middle column, and a secondary yoke with a magnetic flux density less than that of the primary yoke is added in parallel with the primary yoke along the magnetic flux direction, so that when the coil is connected to a light load, the magnetic flux mainly flows through the secondary yoke. Since the magnetic resistance of the secondary yoke is small, the coupling coefficient between the two windings formed by the coil and the middle column is large, thereby greatly improving the inductance value of the inverter inductor under light load. As the load increases, when the secondary yoke is saturated, the magnetic flux begins to flow through the primary yoke, so the inductance value of the inverter inductor can maintain the nonlinear characteristics of the primary yoke. Therefore, the present technical solution achieves the improvement of the inductance value under light load while ensuring that the inductance value under heavy load remains unchanged, effectively improving the problem of THDI under light load.

[0060] The inverter inductor and inverter provided by the utility model are introduced in detail above. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0061] It should also be noted that, in this specification, relational terms such as upper and lower are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. An inverter inductor, characterized in that: include: A primary magnetic yoke, a secondary magnetic yoke, a center column, and a coil wound around the center column; The center column comprises a first center column (101) and a second center column (102); the primary magnetic yoke comprises an upper magnetic yoke (103) and a lower magnetic yoke (104); the upper magnetic yoke (103) is arranged at the upper ends of the first center column (101) and the second center column (102); and the lower magnetic yoke (104) is arranged at the lower ends of the first center column (101) and the second center column (102); The secondary magnetic yoke is connected in parallel with at least one of the primary magnetic yokes along the magnetic flux direction; The magnetic flux density of the secondary magnetic yoke is smaller than the magnetic flux density of the primary magnetic yoke.

2. The inverter inductor according to claim 1, characterized in that: The number of the secondary magnetic yokes is multiple.

3. The inverter inductor according to claim 2, characterized in that: The surfaces of the upper magnetic yoke (103) and the lower magnetic yoke (104) are both provided with the secondary magnetic yoke.

4. The inverter inductor according to claim 2, characterized in that: The entire secondary yoke is disposed on the surface of the upper yoke (103) or the lower yoke (104).

5. The inverter inductor according to claim 3, characterized in that: The secondary magnetic yoke comprises a first magnetic yoke (107) and a second magnetic yoke (108); The first magnetic yoke (107) and the upper magnetic yoke (103) are connected in parallel along the magnetic flux direction; The second magnetic yoke (108) is connected in parallel with the lower magnetic yoke (104) along a magnetic flux direction.

6. The inverter inductor according to claim 5, characterized in that: The first magnetic yoke (107) is located on the upper surface of the upper magnetic yoke (103); and the second magnetic yoke (108) is located on the lower surface of the lower magnetic yoke (104).

7. The inverter inductor according to claim 3, characterized in that: The secondary magnetic yoke comprises four magnetic yokes, two of which are arranged on the front and rear surfaces of the upper magnetic yoke (103), and the other two are arranged on the front and rear surfaces of the lower magnetic yoke (104).

8. The inverter inductor according to any one of claims 1 to 7, characterized in that: The secondary magnetic yoke is adhered to the surface of the primary magnetic yoke by glue.

9. The inverter inductor according to claim 8, characterized in that: The length of the secondary magnetic yoke along the magnetic flux direction is less than or equal to the length of the primary magnetic yoke.

10. An inverter, characterized in that: The inverter inductor comprises the inverter inductor as described in any one of claims 1 to 9.

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