CN112820525A - Three-phase high-frequency inductor of multiplexing magnetic circuit - Google Patents
Three-phase high-frequency inductor of multiplexing magnetic circuit Download PDFInfo
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- CN112820525A CN112820525A CN202110155017.4A CN202110155017A CN112820525A CN 112820525 A CN112820525 A CN 112820525A CN 202110155017 A CN202110155017 A CN 202110155017A CN 112820525 A CN112820525 A CN 112820525A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/38—Instruments transformers for polyphase ac
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
Abstract
The invention discloses a three-phase high-frequency inductor with a multiplexing magnetic circuit, which comprises an A, B, C-phase inductance winding magnetic core which adopts a -shaped frame structure, and a magnetic core which adopts a -shaped frame structure, wherein a left window (10), a middle window (11) and a right window (12) are enclosed by an upper magnetic core beam (1), a lower magnetic core beam (2), a first magnetic core upright post (3), a second magnetic core upright post (4), a third magnetic core upright post (5) and a fourth magnetic core upright post (6); the A-phase magnetic flux phi a and the B-phase magnetic flux phi B in the second magnetic core column are in the same phase, and the B-phase magnetic flux phi B and the C-phase magnetic flux phi C in the third magnetic core column are in the same phase; the invention multiplexes the magnetic circuit, which is equivalent to the magnetic circuit multiplexing the A phase and the C phase in the B phase, the volume and the weight of the magnetic element are reduced, the cost is reduced, the heat loss is reduced, and the heat dissipation of the magnetic element is optimized.
Description
Technical Field
The invention relates to an inductance element, in particular to a three-phase high-frequency inductor with a multiplexed magnetic circuit.
Background
Common three-phase PFC topologies are three-phase hexaswitch, Vienna topology, and their variants, and the topologies are shown in fig. 1 and 2. The three input inductors La, Lb and Lc are symmetrical, and the inductance are the same and the material is the same in design. The three inductors work in the same state, the input current is the same, and the phase difference is 120 degrees. Therefore, in a similar application scenario, in order to reduce the volume of the magnetic core in the design of the inductor, a three-phase common magnetic core is often selected to reduce the volume of the magnetic element. However, in the common magnetic core in the existing three-phase integrated inductor, some magnetic fluxes are mutually offset, so that the volume of the element cannot be further reduced, and the magnetic loss is high.
Therefore, how to design a three-phase high-frequency inductor with small volume, small magnetic loss and good heat dissipation is an urgent technical problem to be solved in the industry.
Disclosure of Invention
In order to solve the above-mentioned defects in the prior art, the present invention provides a three-phase high-frequency inductor with multiplexed magnetic circuits.
The technical scheme adopted by the invention is to design a three-phase high-frequency inductor with a multiplexing magnetic circuit, which comprises an A-phase inductance winding, a B-phase inductance winding, a C-phase inductance winding and a magnetic core, wherein the magnetic core adopts an -shaped frame structure and is enclosed into a left window, a middle window and a right window by an upper magnetic core cross beam, a lower magnetic core cross beam, a first magnetic core upright post, a second magnetic core upright post, a third magnetic core upright post and a fourth magnetic core upright post; the A-phase inductance winding is wound on the side wall around the left window to generate an A-phase magnetic flux phi a; the B-phase inductance winding is wound on the side wall around the middle window to generate B-phase magnetic flux phi B; the C-phase inductance winding is wound on the side wall around the right window to generate C-phase magnetic flux phi C; the A-phase magnetic flux phi a and the B-phase magnetic flux phi B in the second magnetic core column are in the same phase, and the B-phase magnetic flux phi B and the C-phase magnetic flux phi C in the third magnetic core column are in the same phase.
The A-phase inductance winding is divided into two sections and is respectively wound on the upper magnetic core cross beam and the lower magnetic core cross beam at the position of the left window; the B-phase inductance winding is divided into two sections and is respectively wound on the upper magnetic core cross beam and the lower magnetic core cross beam at the position of the middle window; the C-phase inductance winding is divided into two sections and is respectively wound on the upper magnetic core cross beam and the lower magnetic core cross beam at the position of the right window.
In one design scheme, the phase A inductance winding, the phase B inductance winding and the phase C inductance winding all adopt a left spiral winding structure; the current in the A-phase and C-phase inductive windings flows from the head end to the tail end of the windings, and the current in the B-phase inductive winding flows from the tail end to the head end of the windings; or the current in the A-phase and C-phase inductive windings flows from the tail end to the head end of the windings, and the current in the B-phase inductive winding flows from the head end to the tail end of the windings.
In another design scheme, the phase A inductance winding, the phase B inductance winding and the phase C inductance winding all adopt a right spiral winding structure, wherein the current in the phase A inductance winding and the phase C inductance winding flows from the head end to the tail end of the winding, and the current in the phase B inductance winding flows from the tail end to the head end of the winding; or the current in the A-phase and C-phase inductive windings flows from the tail end to the head end of the windings, and the current in the B-phase inductive winding flows from the head end to the tail end of the windings.
In another design scheme, the phase A inductance winding and the phase C inductance winding both adopt a left spiral winding structure, and the phase B inductance winding adopts a right spiral winding structure; the current in the A-phase, B-phase and C-phase inductive windings flows from the head end to the tail end of the windings; or the current in the A-phase, B-phase and C-phase inductive windings flows from the tail end to the head end of the windings.
In another design scheme, the phase A inductance winding and the phase C inductance winding both adopt a right spiral winding structure, and the phase B inductance winding adopts a left spiral winding structure; the current in the A-phase, B-phase and C-phase inductive windings flows from the head end to the tail end of the windings; or the current in the A-phase, B-phase and C-phase inductive windings flows from the tail end to the head end of the windings.
Each phase of inductance winding is divided into two sections, the turns of the two sections of windings are equal, and the two sections of windings are wound on the upper magnetic core beam and the lower magnetic core beam respectively.
The technical scheme provided by the invention has the beneficial effects that: firstly, a magnetic circuit is multiplexed, and a magnetic circuit is originally required for each phase, but the design is equivalent to that the magnetic circuit with the A phase and the C phase is multiplexed by the B phase; the size and the weight of the magnetic element are reduced, and compared with three independent magnetic elements, the magnetic element is convenient to install, and the installation difficulty is greatly reduced; thirdly, the cost is reduced, the size is reduced, and the cost can be reduced; and fourthly, heat loss is reduced, the loss of the magnetic element is in direct proportion to the volume of the magnetic element, the volume is reduced, the loss is also reduced, the heat release quantity is greatly reduced after the magnetic flux of the multiplexing part is reduced, and the heat dissipation of the magnetic element can be optimized.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
fig. 1 is a schematic diagram of a three-phase PFC topology;
fig. 2 is a schematic diagram of a three-phase Vienna PFC topology;
FIG. 3 is a schematic structural diagram of a conventional three-phase high-frequency inductor;
FIG. 4 is a schematic diagram of the windings of the present invention changing the flow of phase B current to equalize the flux;
FIG. 5 is a schematic diagram of the windings of the present invention with the windings altered to have the same magnetic flux;
FIG. 6 is a schematic diagram of a temperature distribution of a conventional three-phase high-frequency inductor;
FIG. 7 is a schematic diagram of the temperature distribution of the three-phase high-frequency inductor of the present invention;
fig. 8 is a comparison of prior art and inventive inductive flux curves.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The three-phase high-frequency inductor provided by the invention reuses a magnetic circuit by utilizing a magnetic flux offset method in a three-phase power system, so that the effective cross-sectional area is reduced, the volume and the weight of the magnetic element can be reduced, the cost is further reduced, the loss of the whole magnetic element can be reduced by reducing the volume, and the heat dissipation is optimized.
See alsoFig. 3 shows a schematic structural diagram of a conventional three-phase high-frequency inductor, where the phase difference between each phase voltage of a three-phase power grid is 120 °, assuming that:
，
；
(ii) a Can obtain magnetic fluxes of respectively
；
；
(ii) a If the number of turns of the wire is equal, the magnetic flux generated by the three-phase alternating current is also the same in magnitude and is 120 ° out of phase. According to the winding method shown in fig. 3, the magnetic fluxes at the intersection of the a phase and the B phase are opposite, and then the magnetic fluxes at the shared core are the same according to the rule of vector subtraction
The flux in this case would be reduced by 0.27 in volume compared to a completely independent, unshared core solution, but the cross-sectional area of the shared portion would be separate
Doubling; but if the flux of the common part is in phase, then the rule of vector addition is followed
The magnetic flux has no change in amplitude compared with the original magnetic flux and only has changed phase, so that the effective cross-sectional area of the magnetic core of the shared part is not increased under the design, and the volume of the magnetic element is reduced.
The invention discloses a three-phase high-frequency inductor with a multiplexing magnetic circuit, and referring to fig. 4, the three-phase high-frequency inductor comprises an A-phase inductor winding 7, a B-phase inductor winding 8, a C-phase inductor winding 9 and a magnetic core, wherein the magnetic core adopts an -shaped frame structure and is enclosed into a left window 10, a middle window 11 and a right window 12 by an upper magnetic core beam 1, a lower magnetic core beam 2, a first magnetic core upright post 3, a second magnetic core upright post 4, a third magnetic core upright post 5 and a fourth magnetic core upright post 6; the A-phase inductance winding is wound on the side wall around the left window to generate an A-phase magnetic flux phi a; the B-phase inductance winding is wound on the side wall around the middle window to generate B-phase magnetic flux phi B; the C-phase inductance winding is wound on the side wall around the right window to generate C-phase magnetic flux phi C; the A-phase magnetic flux phi a and the B-phase magnetic flux phi B in the second magnetic core column are in the same phase, and the B-phase magnetic flux phi B and the C-phase magnetic flux phi C in the third magnetic core column are in the same phase.
It should be noted that for convenience, a number of directional and numerical terms are used herein, such as: the terms upper, lower, left, middle, right, head, end, first, second, third and fourth are used for describing the position relationship of each element, so that the terms are convenient to be compared with the drawings, and the invention is convenient for people to understand, but is not limited to the invention.
In the preferred embodiment, the a-phase inductive winding 7 is divided into two sections, and respectively wound on the upper core beam 1 and the lower core beam 2 at the position of the left window 10; the B-phase inductance winding 8 is divided into two sections and respectively wound on the upper magnetic core beam 1 and the lower magnetic core beam 2 at the position of the middle window 11; the C-phase inductance winding 9 is divided into two sections, and respectively wound on the upper magnetic core beam 1 and the lower magnetic core beam 2 at the position of the right window 12.
Referring to FIG. 4, one embodiment is shown: the phase A inductance winding 7, the phase B inductance winding 8 and the phase C inductance winding 9 all adopt a left spiral winding structure; the current in the A-phase and C-phase inductive windings flows from the head end to the tail end of the windings, and the current in the B-phase inductive winding flows from the tail end to the head end of the windings; or the current in the A-phase and C-phase inductive windings flows from the tail end to the head end of the windings, and the current in the B-phase inductive winding flows from the head end to the tail end of the windings.
The present invention is to maintain a common part by changing a winding or a current flow direction in a magnetic element having a three-phase common coreThe divided magnetic fluxes are in the same direction, and the characteristic that the phase difference of a three-phase power grid is 120 degrees is utilized, so that the amplitude of the magnetic flux of the shared part is unchanged, and the volume of the magnetic core can be effectively reduced. Taking the second magnetic core column 4 in fig. 4 as an example, the rule of vector addition is adopted
The magnetic flux has no change in amplitude compared with the original magnetic flux and only has changed phase, so that the effective cross-sectional area of the magnetic core of the shared part is not increased under the design, and the volume of the magnetic element is reduced. Fig. 8 shows a comparison of the inductance flux curves of the prior art and the present invention, which is a simulation diagram, the curve of the a-phase flux generated by the a-phase inductance winding is shown as "Φ a", and if the fluxes are subtracted in the shared second core leg 4, the resultant curve is shown as "Φ a- Φ b", which is increased by 1.73 times compared to Φ a. If the magnetic fluxes are added in the common second core leg 4, the resultant curve is as shown by "Φ a + Φ b", and the magnitude of the magnetic fluxes is the same as that of a single phase. After the invention is adopted, the magnetic flux in the shared magnetic core upright post is not increased, thereby reducing the volume of the inductor and reducing the loss.
In the case of a scheme in which the winding direction is not to be changed, the magnetic flux of the portion sharing the core on both sides can be changed by exchanging the flowing direction of the B-phase current, and in the case of the magnetic element, the flowing directions of the a-phase and C-phase currents can be changed while keeping the B-phase constant. As shown in fig. 4. In another embodiment, the phase a inductance winding 7, the phase B inductance winding 8 and the phase C inductance winding 9 all adopt a right spiral winding structure, wherein the current in the phase a and the phase C inductance windings flows from the winding head end to the winding tail end, and the current in the phase B inductance winding flows from the winding tail end to the winding head end; or the current in the A-phase and C-phase inductive windings flows from the tail end to the head end of the windings, and the current in the B-phase inductive winding flows from the head end to the tail end of the windings.
For the scheme that the current direction is not convenient to change, the magnetic flux direction can be changed by changing a winding method. The winding direction of the phase B and the winding direction of the phase A and the phase C can be independently opposite to obtain the same effect. As shown in fig. 5.
In another embodiment, the phase a inductive winding 7 and the phase C inductive winding 9 both adopt a left-handed spiral winding structure, and the phase B inductive winding 8 adopts a right-handed spiral winding structure; the current in the A-phase, B-phase and C-phase inductive windings flows from the head end to the tail end of the windings; or the current in the A-phase, B-phase and C-phase inductive windings flows from the tail end to the head end of the windings.
In another embodiment, the phase a inductive winding 7 and the phase C inductive winding 9 both adopt a right-handed spiral winding structure, and the phase B inductive winding 8 adopts a left-handed spiral winding structure; the current in the A-phase, B-phase and C-phase inductive windings flows from the head end to the tail end of the windings; or the current in the A-phase, B-phase and C-phase inductive windings flows from the tail end to the head end of the windings.
And simulating the same inductor according to the idea. According to the same heat dissipation condition and the same current input size, only the flow direction of the input B-phase current is changed, and the final loss and heat dissipation are obviously different. The temperature distribution of fig. 6 is a temperature distribution in the current flow direction of fig. 3. The temperature distribution of fig. 7 is a temperature distribution in the current flow direction of fig. 4. Comparing the temperatures under these two conditions, it is seen that the temperature of the middle core decreased by 18 ℃ after the current direction was changed, with some decrease in the temperature of the entire inductor.
The magnetic element system sharing three-phase power in the three-phase power grid can be designed by the idea, the magnetic flux can be counteracted as much as possible by changing the direction of the magnetic flux at the part sharing the magnetic core, and the realization method can simply realize the magnetic flux counteraction by leading the current flow directions of the B phases to be different or leading the windings of the B phases to be different.
Each phase of inductance winding is divided into two sections, the turns of the two sections of windings are equal, and the two sections of windings are wound on the upper magnetic core beam 1 and the lower magnetic core beam 2 respectively.
The foregoing examples are illustrative only and are not intended to be limiting. Any equivalent modifications or variations without departing from the spirit and scope of the present application should be included in the claims of the present application.
Claims (7)
1. The utility model provides a three-phase high frequency inductance of multiplexing magnetic circuit, includes A looks inductance winding (7), B looks inductance winding (8), C looks inductance winding (9) to and the magnetic core, its characterized in that: the magnetic core adopts an -shaped frame structure, and is enclosed into a left window (10), a middle window (11) and a right window (12) by an upper magnetic core cross beam (1), a lower magnetic core cross beam (2), a first magnetic core upright post (3), a second magnetic core upright post (4), a third magnetic core upright post (5) and a fourth magnetic core upright post (6); the A-phase inductance winding is wound on the side wall around the left window to generate an A-phase magnetic flux phi a; the B-phase inductance winding is wound on the side wall around the middle window to generate B-phase magnetic flux phi B; the C-phase inductance winding is wound on the side wall around the right window to generate C-phase magnetic flux phi C;
the A-phase magnetic flux phi a and the B-phase magnetic flux phi B in the second magnetic core column are in the same phase, and the B-phase magnetic flux phi B and the C-phase magnetic flux phi C in the third magnetic core column are in the same phase.
2. The three-phase high-frequency inductor of multiplexed magnetic circuit according to claim 1, wherein: the A-phase inductance winding (7) is divided into two sections and respectively wound on the upper magnetic core beam (1) and the lower magnetic core beam (2) at the position of the left window (10); the B-phase inductance winding (8) is divided into two sections and respectively wound on the upper magnetic core beam (1) and the lower magnetic core beam (2) at the position of the middle window (11); the C-phase inductance winding (9) is divided into two sections and respectively wound on the upper magnetic core beam (1) and the lower magnetic core beam (2) at the position of the right window (12).
3. The three-phase high-frequency inductor of multiplexed magnetic circuit according to claim 2, wherein: the phase A inductance winding (7), the phase B inductance winding (8) and the phase C inductance winding (9) all adopt a left spiral winding structure;
the current in the A-phase and C-phase inductive windings flows from the head end to the tail end of the windings, and the current in the B-phase inductive winding flows from the tail end to the head end of the windings; or the current in the A-phase and C-phase inductive windings flows from the tail end to the head end of the windings, and the current in the B-phase inductive winding flows from the head end to the tail end of the windings.
4. The three-phase high-frequency inductor of multiplexed magnetic circuit according to claim 2, wherein: the phase A inductance winding (7), the phase B inductance winding (8) and the phase C inductance winding (9) all adopt a right spiral winding structure,
the current in the A-phase and C-phase inductive windings flows from the head end to the tail end of the windings, and the current in the B-phase inductive winding flows from the tail end to the head end of the windings; or the current in the A-phase and C-phase inductive windings flows from the tail end to the head end of the windings, and the current in the B-phase inductive winding flows from the head end to the tail end of the windings.
5. The three-phase high-frequency inductor of multiplexed magnetic circuit according to claim 2, wherein: the A-phase inductance winding (7) and the C-phase inductance winding (9) both adopt a left spiral winding structure, and the B-phase inductance winding (8) adopts a right spiral winding structure;
the current in the A-phase, B-phase and C-phase inductive windings flows from the head end to the tail end of the windings; or the current in the A-phase, B-phase and C-phase inductive windings flows from the tail end to the head end of the windings.
6. The three-phase high-frequency inductor of multiplexed magnetic circuit according to claim 2, wherein: the A-phase inductance winding (7) and the C-phase inductance winding (9) both adopt a right spiral winding structure, and the B-phase inductance winding (8) adopts a left spiral winding structure;
the current in the A-phase, B-phase and C-phase inductive windings flows from the head end to the tail end of the windings; or the current in the A-phase, B-phase and C-phase inductive windings flows from the tail end to the head end of the windings.
7. The three-phase high-frequency inductor with multiplexed magnetic circuits according to any of claims 2 to 6, wherein: each phase of inductance winding is divided into two sections, the turns of the two sections of windings are equal, and the two sections of windings are wound on the upper magnetic core beam (1) and the lower magnetic core beam (2) respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110155017.4A CN112820525A (en) | 2021-02-04 | 2021-02-04 | Three-phase high-frequency inductor of multiplexing magnetic circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110155017.4A CN112820525A (en) | 2021-02-04 | 2021-02-04 | Three-phase high-frequency inductor of multiplexing magnetic circuit |
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| CN112820525A true CN112820525A (en) | 2021-05-18 |
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| CN202110155017.4A Pending CN112820525A (en) | 2021-02-04 | 2021-02-04 | Three-phase high-frequency inductor of multiplexing magnetic circuit |
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