CN217606671U

CN217606671U - Inductor and converter

Info

Publication number: CN217606671U
Application number: CN202220177315.3U
Authority: CN
Inventors: 江竑旭; 范先焱; 梁金坤
Original assignee: Huawei Digital Power Technologies Co Ltd
Current assignee: Huawei Digital Power Technologies Co Ltd
Priority date: 2022-01-21
Filing date: 2022-01-21
Publication date: 2022-10-18
Anticipated expiration: 2032-01-21
Also published as: CN218568607U

Abstract

The application provides an inductor, which comprises a magnetic core and at least two windings; the magnetic cores comprise at least three strip-shaped magnetic cores and at least two magnetic column groups which are arranged at intervals, each magnetic column group comprises two middle column magnetic cores, one of the at least two magnetic column groups is arranged between every two adjacent strip-shaped magnetic cores, and two ends of each middle column magnetic core are respectively connected with one of the at least three strip-shaped magnetic cores; one of the at least two windings is wound on each magnetic column group, and each winding is used for receiving an input signal. The present application further provides a converter.

Description

Inductor and converter

Technical Field

The present disclosure relates to power conversion devices, and particularly to an inductor and a converter using the inductor.

Background

A multi-phase Direct current-Direct current (DC-DC) converter comprises a plurality of inductors for realizing energy conversion. In a conventional multiphase DC-DC converter, the individual inductors operate independently. When the number of phases of the multiphase DC-DC converter is large, the number of inductors is also large, resulting in a large overall size, high cost, and low power density of the multiphase DC-DC converter.

SUMMERY OF THE UTILITY MODEL

A first aspect of the application provides an inductor comprising a magnetic core and at least two windings;

the magnetic cores comprise at least three strip-shaped magnetic cores and at least two magnetic column groups which are arranged at intervals, each magnetic column group comprises two middle column magnetic cores, one of the at least two magnetic column groups is arranged between every two adjacent strip-shaped magnetic cores, and two ends of each middle column magnetic core are respectively connected with one of the at least three strip-shaped magnetic cores;

one of the at least two windings is wound on each magnetic column group, and each winding is used for receiving an input signal.

The inductor comprises a magnetic core and at least two windings. The magnetic cores comprise at least three strip-shaped magnetic cores and at least two magnetic column groups, and one of the at least two magnetic column groups is arranged between every two adjacent strip-shaped magnetic cores. And each winding in the inductor receives an input signal. The inductor thus corresponds to the integration of at least two inductor units that operate independently (two adjacent strip cores, the set of magnetic pillars between the two adjacent strip cores, and the winding wound around the set of magnetic pillars can be collectively referred to as an inductor unit). And according to the structure, the two inductance units also share the strip-shaped magnetic core. Therefore, when the inductor is integrated with a plurality of inductors, the size of the inductor is smaller than that of a plurality of independent inductors in the prior art.

When the inductor is applied to the converter, the overall size of the converter is reduced, the cost of the converter is reduced, and the power density of the converter is improved. When the inductor works, the magnetic fields generated by every two adjacent inductor units can be mutually superposed or offset by controlling the direction of the input signal of each winding, so that the functional diversity of the inductor is favorably improved.

In some embodiments, each of the windings includes two sets of coils, and the two sets of coils are respectively wound around two center pillar magnetic cores in the same magnetic pillar set.

So, all around being equipped with the coil on two center pillar magnetic cores, be favorable to increasing the coil number of turns of each winding to promoted the utilization efficiency of magnetic core, also be favorable to making electric induction be used for in the circuit of high power.

In some embodiments, the number of the windings is the same as the number of the magnetic pole groups, and the number of the strip-shaped magnetic cores is one more than the number of the windings.

So, can be so that every adjacent inductance unit all shares the bar magnetic core, and every two adjacent bar magnetic cores, the magnetic column group between these two adjacent bar magnetic cores and the winding of locating on this magnetic column group can regard as the inductance unit jointly for whole inductance has higher integrated level.

In some embodiments, two ends of each of the center pillar magnetic cores are respectively and fixedly connected to one of the at least three bar-shaped magnetic cores.

So, center pillar magnetic core and bar magnetic core are fixed mutually, are favorable to keeping the structural stability of magnetic core.

In some embodiments, the magnetic core is integrally formed.

So, be favorable to further promoting the structural stability of magnetic core, and be favorable to reducing the preparation step of magnetic core.

In some embodiments, the magnetic core further comprises a bottom plate, and the magnetic core is fixed on the bottom plate.

Thus, the structural stability of the magnetic core is further improved, and the inductor is integrally fixed to other external structures (such as a converter) in a follow-up mode.

A second aspect of the present application provides an inductor comprising a magnetic core and two windings;

the magnetic core comprises two curved first core units;

each first magnetic core unit is wound with one of the two windings, each winding is used for receiving an input signal, each winding generates a magnetic induction line when receiving the input signal, and the magnetic induction lines generated by the two windings respectively have closed magnetic circuits passing through different first magnetic core units.

The inductor comprises a magnetic core and at least two windings. The magnetic core includes two curved first core elements. Each winding in the inductor receives an input signal and is used for generating a magnetic induction line according to the input signal, and a closed magnetic circuit of the magnetic induction line generated by the two windings passes through different first inductor units. The inductor thus corresponds to the integration of two independently operating inductor units (each first core unit and the winding wound around the first core unit can be regarded as an inductor unit). Therefore, the inductor has a smaller volume than two independent inductors in the prior art.

When the inductor is applied to the converter, the overall size of the converter is reduced, the cost of the converter is reduced, and the power density of the converter is improved. And when the inductor works, the magnetic fields generated by the two inductor units can be mutually superposed or offset by controlling the direction of the input signal of each winding, so that the functional diversity of the inductor is favorably improved.

In some embodiments, each of the first core units is semi-circular;

the magnetic core still includes second magnetic core unit, second magnetic core unit is the bar, second magnetic core unit is located two between the first magnetic core unit.

In some embodiments, each of the first magnetic core units is ring-shaped, and two of the first magnetic core units are connected.

So, the part of magnetic core further reduces, is favorable to further promoting the structural stability of inductance.

In some embodiments, the magnetic core is integrally formed.

So, be favorable to promoting the structural stability of magnetic core, and be favorable to reducing the preparation step of magnetic core.

In some embodiments, the inductor further comprises a bottom plate, and the magnetic core is fixed on the bottom plate.

A third aspect of the present application provides a converter having an input and an output, the converter further comprising:

at least one inductor as claimed in any one of the above claims coupled to said output; and

and the control part is coupled to the input end and is respectively and electrically connected with each inductor and used for respectively providing the input signal for each winding.

In some embodiments, the magnetic core includes at least three bar-shaped magnetic cores and at least two magnetic pillar groups, and one of the at least two magnetic pillar groups is arranged between every two adjacent bar-shaped magnetic cores. And each winding in the inductor receives an input signal. The inductor thus corresponds to the integration of at least two inductor units that operate independently (two adjacent strip cores, the set of magnetic pillars between the two adjacent strip cores, and the winding wound around the set of magnetic pillars can be collectively referred to as an inductor unit). And according to the structure, the two inductance units also share the strip-shaped magnetic core. Therefore, when the inductor is integrated with a plurality of inductors, the size of the inductor is smaller than that of a plurality of independent inductors in the prior art.

In other embodiments, the magnetic core includes two curved first magnetic core elements. Each winding in the inductor receives an input signal, so that the windings generate magnetic fields according to the input signals, and closed magnetic circuits of magnetic induction lines in the magnetic fields generated by the two windings pass through different first magnetic core units. The inductor thus corresponds to the integration of two independently operating inductor units (each first core unit and the winding wound around it can be collectively considered as an inductor unit). Therefore, compared with two independent inductors in the prior art, the inductor has smaller volume.

Therefore, when the inductor is applied to the converter, the overall size of the converter is reduced, the cost of the converter is reduced, and the power density of the converter is improved. When the inductor works, the directions of the input signals of the inductor units are controlled, so that magnetic fields generated by every two adjacent inductor units can be mutually superposed or offset, and the improvement of the functional diversity of the inductor is facilitated. Therefore, the converter is beneficial to reducing the whole volume, reducing the cost, improving the power density and improving the functional diversity by applying the inductor.

Drawings

Fig. 1 is a schematic circuit diagram of a converter according to a first embodiment of the present application.

Fig. 2 is a structural diagram of the inductor in fig. 1.

Fig. 3 is a structural view of the magnetic core of fig. 2.

Fig. 4 is a schematic plane structure diagram of the inductor in fig. 2.

Fig. 5 is a structural diagram of a magnetic core in a modified embodiment of the first embodiment of the present application.

Fig. 6 is a structural diagram of an inductor according to a second embodiment of the present application.

Fig. 7 is a structural view of the magnetic core of fig. 6.

Fig. 8 is a structural diagram of an inductor according to a third embodiment of the present application.

Fig. 9 is a structural view of the magnetic core in fig. 8.

Description of the main elements

Detailed Description

The embodiments of the present application will be described below with reference to the drawings.

Example one

The converter can be applied to various lithium battery products, such as lithium (storage) batteries for communication base stations, energy storage batteries for data centers, energy storage batteries matched with photovoltaic inverters, household energy storage systems, power battery systems of electric vehicles, new energy power generation and energy storage lithium battery products and the like.

Referring to fig. 1, a converter 1 in the present embodiment includes an inductor 100 and a control unit 200 electrically connected to each other. Converter 1 has an input 300 and an output 800. The inductor 100 is coupled to the output terminal 800, and the control part 200 is coupled to the input terminal 300. The converter 1 may also include other necessary circuit configurations, and the present application is primarily described with respect to the inductor 100. In this embodiment, the converter 1 is a DC-DC converter, and the input end 300 and the output end 800 are respectively used for inputting and outputting a DC signal. In other embodiments, the converter 1 may also be an ac-ac converter. The control portion 200 is used for providing an input signal to the inductor 100. In this embodiment, the input signal of the inductor 100 is a ripple current signal (dc plus ac).

The inductor 100 is used to receive at least two input signals. In this embodiment, the inductor 100 is configured to receive two input signals: input signal V1 and input signal V2. The present application does not limit the magnitude and direction relationship of the two input signals V1 and V2.

Referring to fig. 2, the inductor 100 of the present embodiment includes a magnetic core 110 and two windings 120. Two windings 120 are wound around the core 110. Each winding 120 is configured to receive an input signal, i.e., one winding 120 receives the input signal V1 and the other winding receives the input signal V2.

The magnetic core 110 of the present embodiment includes three bar-shaped magnetic cores 111 and two magnetic pillar groups 112, and each magnetic pillar group 112 includes two center pillar magnetic cores 1121. The three strip cores 111 are arranged in parallel and spaced apart from each other. One of the two magnetic pillar groups 112 is arranged between every two adjacent strip-shaped magnetic cores 111. The two center pillar cores 1121 of the magnetic pillar group 112 are respectively columnar. The two center pillar cores 1121 in the magnetic pillar group 112 are spaced apart from each other. Both ends of each center pillar core 1121 are connected to two adjacent bar cores 111, respectively. In this embodiment, two ends of each center pillar core 1121 are respectively fixed to two adjacent bar cores 111, for example, by glue. Thus, it is advantageous to improve the structural stability of the magnetic core 110. In this embodiment, the material of the magnetic core 110 may be ferrite, metal powder core, nano amorphous, silicon steel, or the like.

In other embodiments, two ends of each center pillar magnetic core 1121 may respectively contact but not be fixed to two adjacent bar magnetic cores 111.

Referring to fig. 2 and 3, each winding 120 is wound around one of the two magnetic pole sets 112. That is, one of the two windings 120 is wound around each of the magnetic pole groups 112. In this embodiment, each winding 120 includes two sets of

coils

121 and 122. The coil 121 and the coil 122 are respectively wound around two center pillar cores 1121 of the same magnetic pillar group 112.

Referring to fig. 4, in the present embodiment, each winding 120 is formed by a conducting wire L having a first end 123 and a second end 124. That is, the two

coils

121 and 122 in the same winding 120 are formed by the same wire L, and the two

coils

121 and 122 have a first end 123 and a second end 124 in common. In this embodiment, the first end 123 of the winding 120 is on the coil 121 side and the second end 124 is on the coil 122 side. One of the first terminal 123 and the second terminal 124 serves as an input terminal of a signal and the other serves as an output terminal of the signal. For example, when the first terminal 123 is an input terminal, the second terminal 124 is an output terminal.

Referring to fig. 2 and fig. 3, in the present embodiment, the inductor 100 further includes a bottom plate 130, and the magnetic core 110 is fixed on the bottom plate 130. In this manner, further securing of the various structures in the core 110 is facilitated. And by means of the bottom plate 130 it is advantageous to fix the inductor 100 integrally in an external structure, for example the inductor 100 integrally in the converter 1. The base plate 130 is made of an insulating rigid material, for example, epoxy resin. In other embodiments, the bottom plate 130 may also have good heat dissipation.

In other embodiments, the magnetic core 110 is integrally formed. Therefore, the stability of the overall structure of the magnetic core 110 is improved, and a fixing process is not required after the strip-shaped magnetic core 111 and the middle pillar magnetic core 1121 are formed, which is beneficial to simplifying the manufacturing process of the magnetic core 110.

In this embodiment, the two windings 120 receive input signals V1 and V2, respectively. The two windings 120 generate magnetic fields when receiving an input signal. The inductor 100 of the present embodiment can be considered as integrating two inductor units that can work independently: an inductive element 140 and an inductive element 150. The bar-shaped magnetic core 111 (1), the bar-shaped magnetic core 111 (2), the magnetic column group 112 (1) and the winding 120 on the magnetic column group 112 (1) form an inductance unit 140, and the bar-shaped magnetic core 111 (2), the bar-shaped magnetic core 111 (3), the magnetic column group 112 (2) and the winding 120 on the magnetic column group 112 (2) form an inductance unit 150. The bar-shaped magnetic core 111 (1), the bar-shaped magnetic core 111 (2), and the magnetic pillar group 112 (1) constitute a magnetic core portion of the inductance unit 140, and the bar-shaped magnetic core 111 (2), the bar-shaped magnetic core 111 (3), and the magnetic pillar group 112 (2) constitute a magnetic core portion of the inductance unit 150. It can be seen that inductance element 140 and inductance element 150 share strip core 111 (2).

Fig. 3 shows a closed magnetic path of the magnetic induction lines generated by the inductance unit 140 and the inductance unit 150 when an input signal is present, where the magnetic induction line generated by the inductance unit 140 has a magnetic path L1, and the magnetic induction line generated by the inductance unit 150 has a magnetic path L2. Since the entire closed path of the magnetic circuit 2 and the magnetic circuit 3 is along the magnetic core 110, it is beneficial to improve the inductance of the inductor 100. And since the strip-shaped magnetic core 111 (2) is shared and both the magnetic circuit L1 and the magnetic circuit L2 have a portion along the strip-shaped magnetic core 111 (2), the magnetic fields formed by the inductance unit 140 and the inductance unit 150 may also affect each other, such as overlap each other or cancel each other. By controlling the directions of the input signals V1 and V2 in the two windings 120, the magnetic fields formed by the inductive element 140 and the inductive element 150 can be controlled to overlap or cancel each other, and the degree of overlap and cancellation. In this way, the function of the inductor 100 is more diversified.

Therefore, the inductor 100 of the present embodiment integrates two inductor units, and the magnetic core portions of the two inductor units are shared, so that the magnetic core of the inductor 100 has a smaller volume than that of two inductors alone. That is, the inductor 100 of the present embodiment is advantageous to reduce the volume of the magnetic core 110 based on the integration of two inductor units that can work independently.

When inductor 100 is applied to converter 1, it is beneficial to reduce the size of converter 1, reduce the cost of converter 1, and increase the power density of converter 1.

In other embodiments, the magnetic core 110 may further include other numbers of bar-shaped magnetic cores 111 and magnetic pillar groups 112 (center pillar magnetic cores 1121), and the inductor 100 may further include other numbers of windings 120. That is, in other embodiments, the inductor may further integrate a greater number of inductor units.

For example, referring to fig. 5, fig. 5 shows a structure of an inductor 400 in a modified embodiment of the present embodiment.

The inductor 400 includes four bar cores 411, three leg groups 412, and three windings 420, and each leg group 412 includes two center leg cores 4121. Inductor 400 can be viewed as integrating three inductor units that can operate independently of each other:

inductive elements

440, 450, 460. Compared to the inductor 100 shown in fig. 2, the inductor 400 integrates more inductor units, and two strip-shaped magnetic cores 411 are shared (the inductor unit 440 and the inductor unit 450 share the strip-shaped magnetic core 411, and the inductor unit 450 and the inductor unit 460 share the strip-shaped magnetic core 411). The core 410 of the inductor 400 integrated with three inductor units is smaller than three independent inductors. When inductor 400 is applied to converter 1, it is advantageous to further reduce the volume of converter 1.

In this modified embodiment, three windings 420 are used to receive input signals V1, V2, V3, respectively. That is, in this modified embodiment, the inductor 400 receives three input signals.

In other embodiments, the inductor may be integrated with a greater number of inductor units.

As can be seen from the inductor 100 shown in fig. 2 and the inductor 400 shown in fig. 5, the inductor of the present application may include at least three bar cores, at least two magnetic pole sets, and at least two windings. The number of the windings is the same as that of the magnetic pole groups, and the windings and the magnetic pole groups are in one-to-one correspondence (namely, one of the two windings is correspondingly wound on each magnetic pole group). The number of the strip-shaped magnetic cores is one more than that of the magnetic column groups, and is also one more than that of the windings. Therefore, each two adjacent strip-shaped magnetic cores, the magnetic column group between the adjacent strip-shaped magnetic cores and the winding wound on the magnetic column group can jointly form the inductance unit capable of working independently. Every two adjacent inductance units share the strip-shaped magnetic core. The compact structure enables the inductor 100 to integrate a plurality of inductor units, which is beneficial to improving the structural integration and reducing the volume of the inductor 100.

In the present embodiment, the inductor 100 integrates two inductor units, and the converter 1 includes a plurality of inductors 100. In other embodiments, the converter 1 may include a plurality of inductors 100, and the inductor 100 may also be integrated with more than three inductor units. In other embodiments, the converter 1 may include a plurality of inductors with different structures or partially the same structure. For example, converter 1 includes a plurality of inductors 100 as shown in fig. 2 and includes a plurality of inductors 400 as shown in fig. 6, with the plurality of inductors 100 being connected in parallel with the plurality of inductors 400.

Example two

The main difference between the inductor of this embodiment and the inductor 100 of the first embodiment is: the magnetic cores differ in structure. The following mainly describes the difference in detail, and the other parts can be referred to the description in the first embodiment.

Referring to fig. 6, the inductor 600 in the present embodiment includes a magnetic core 610, two windings 620, and a bottom plate 630, wherein the magnetic core 610 is fixed on the same surface of the bottom plate 630.

The magnetic core 610 includes two first magnetic core units 611 and a second magnetic core unit 612. The two first core units 611 have a curved shape. In this embodiment, the two first magnetic core units 611 are regular semi-circular ring-shaped, and the second magnetic core units 612 are strip-shaped. The second core unit 612 is located between the two first core units 611. Two ends of each first magnetic core unit 611 are respectively connected to the second magnetic core unit 612. Two windings 620 are respectively wound around the two first magnetic core units 611. That is, one of the two windings 620 is wound on each first magnetic core unit 611. In this embodiment, the two first core units 611 have the same shape. In other embodiments, first core unit 611 may have other irregular curved shapes. In other embodiments, the two first magnetic core units 611 may have different structures.

The inductor 600, winding 621 and winding 622 shown in fig. 6 receive input signals V1 and V2, respectively. The

windings

621 and 622 respectively generate magnetic fields when receiving an input signal, and magnetic induction lines of the magnetic fields have closed magnetic circuits. Referring to fig. 6 and 7, a magnetic path L3 of the magnetic field generated by the winding 621 passes through the first magnetic core unit 611 and the second magnetic core unit 612 wound around the magnetic path L3, and a magnetic path L4 of the magnetic field generated by the winding 622 also passes through the first magnetic core unit 611 and the second magnetic core unit 612 wound around the magnetic path L4. Inductor 600 is equivalent to integrating two inductor elements: an inductive element 640 and an inductive element 650. One of the first core unit 611 and the second core unit 612 may be regarded as a core constituting one of the inductance units, and the other of the first core unit 611 and the second core unit 612 may be regarded as a core constituting the other inductance unit. That is, the two

inductance units

640 and 650 share a part of the magnetic core: the second core unit 612 is shared.

Therefore, the inductor 600 in this embodiment integrates two inductor units that work independently from each other, and since the two inductor units share part of the magnetic core, it is beneficial to reduce the overall size of the inductor 600. When the inductor 600 is applied to the converter 1, the size of the converter 1 is also reduced, and the power density of the converter 1 is increased.

In addition, by controlling the directions of the input signals V1 and V2 in the two windings 620, the directions and the intensities of the magnetic fields of the two inductance units can be controlled to be mutually superimposed or offset, which is beneficial to improving the functional diversity of the inductor 600.

Further, compared to the first embodiment, when the inductor integrates two inductor units, the structure of the magnetic core 610 of the inductor 600 in the first embodiment is simpler, which is beneficial to further reducing the size of the inductor 600.

EXAMPLE III

The main difference between the inductor of this embodiment and the inductor 700 of the second embodiment is: the magnetic cores differ in structure.

Referring to fig. 8, the inductor 700 in the present embodiment includes a magnetic core 710, two windings 720, and a bottom plate 730, wherein the magnetic core 710 is fixed on the same surface of the bottom plate 730. The magnetic core 710 includes two first magnetic core units (first magnetic core units 711 and 712), but does not include the second inductance unit. The following mainly describes the difference in detail, and the rest can be referred to the description of the first embodiment.

In this embodiment, first core unit 711 and first core unit 712 have substantially complete annular shapes. In the present embodiment, the two

first core units

711 and 712 are integrally formed (i.e., the core 710 is integrally formed). In other embodiments, the two first core units 711 may be formed separately and then fixed. In another embodiment, the two first core units 711 are formed separately, contacting each other but not fixed. The

first core units

711 and 712 are fixed to the base plate 730, respectively, to keep the first core units 711 in contact.

Referring to fig. 8 and 9, the inductor 700, the winding 721 and the winding 722 receive the input signals V1 and V2 independently. The

windings

721 and 722 respectively generate magnetic fields when receiving an input signal, and magnetic induction lines of the magnetic fields have closed magnetic circuits. The first core unit 711 along which the magnetic path L5 of the magnetic field generated by the winding 721 is wound, the first core unit 712 along which the magnetic path L6 of the magnetic field generated by the winding 722 is wound, and the magnetic path L5 partially passes through the first core unit 712 and the magnetic path L6 partially passes through the first core unit 711. Then, the inductor 700 is equivalent to integrating two inductor units: an inductive element 740 and an inductive element 750. Inductor unit 740 includes first core unit 711, winding 721, and a portion of first core unit 712, and inductor unit 750 includes first core unit 712, winding 722, and a portion of first core unit 711. Inductor unit 740 and inductor unit 750 share a portion of the magnetic core.

Therefore, on the basis of integrating two inductance units which work independently, the inductance 700 in this embodiment is beneficial to reducing the overall size of the inductance 700 because the two inductance units share part of the magnetic core. When the inductor is applied to the converter 1, the size of the converter 1 is also reduced, and the power density of the converter 1 is increased.

Further, by controlling the direction of the input signal in the two windings 720, the direction and strength of the magnetic fields of the two inductance units can be controlled to be mutually superimposed or offset, which is beneficial to improving the functional diversity of the inductor 700.

Compared with the inductor 700 in the second embodiment, the inductor 700 in this embodiment is also beneficial to further simplifying the structure of the magnetic core 710 and reducing the overall volume of the inductor 700.

It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be taken as limiting the present invention, and that suitable modifications and variations of the above embodiments are within the scope of the invention as claimed.

Claims

1. An inductor, comprising a magnetic core and at least two windings;

2. The inductor according to claim 1, wherein each of the windings comprises two sets of coils, and the two sets of coils are respectively wound around two of the center pillar cores in the same magnetic pillar group.

3. An inductor according to claim 1 or 2, characterised in that the number of windings is the same as the number of groups of magnetic legs, and the number of strip cores is one more than the number of windings.

4. The inductor as claimed in claim 1 or 2, wherein two ends of each of said center pillar cores are respectively fixed and connected to one of said at least three bar cores.

5. An inductor according to claim 1 or 2, characterised in that the core is integrally formed.

6. An inductor according to claim 1 or 2, further comprising a base plate, said core being secured to said base plate.

7. A converter having an input and an output, the converter comprising:

at least one inductor according to any of claims 1-6 coupled to the output terminal; and