Eight-in-one coupling inductor and converter

Abstract

The invention relates to an eight-in-one coupling inductor and a converter, and the eight-in-one coupling inductor comprises two cover plate magnetic cores which are oppositely arranged, and nine cross beam magnetic cores which are located between the two cover plate magnetic cores and are arranged at equal intervals in the length direction of the cover plate magnetic cores. And the eight groups of windings are respectively wound on the two cover plate magnetic cores in a forward winding and reverse winding alternating manner to form a phase inductor, a phase inductor, a phase inductor, a phase inductor, a phase inductor, a phase inductor, a phase inductor and a phase inductor. According to the eight-in-one coupling inductor and the converter, the size of a cross beam magnetic core shared by inductors of different phases can be reduced, and the power density of a system is effectively improved; and magnetic fields with opposite directions are formed through currents of branch inductors in the same phase, so that external magnetic fluxes are mutually counteracted, the external magnetic fluxes of the magnetic core are reduced, and the EMI performance of a system is remarkably improved.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to an eight-in-one coupled inductor and converter. Background Technology

[0002] Three-phase voltage source converters (VSCs) are core components of medium / high power power electronic systems, with applications covering renewable energy grid connection (such as photovoltaic power plants and wind power converters), high-voltage direct current (HVDC) transmission, industrial motor drives (such as rolling mills and mining equipment), and rail transit traction power supply. To meet power demands of megawatt level and above, multiple VSC modules often work collaboratively in parallel architecture. For example, a certain offshore wind power flexible DC project requires the integration of 60 300kV VSC modules, with a total capacity of 1.8GW. Such systems face multiple technical constraints in practical engineering applications. The core challenge lies in the trade-off optimization between power device characteristics, filtering requirements, and system economy. Simultaneously, three-phase voltage source converters require large filtering components to meet power quality requirements. However, large filtering components occupy a significant amount of space, increasing the overall system cost and reducing power density, necessitating improvements. Summary of the Invention

[0003] Therefore, it is necessary to provide an eight-in-one coupled inductor and converter that can improve power density and EMI performance.

[0004] This application provides an eight-in-one coupled inductor, comprising: two cover plate magnetic cores arranged opposite each other; nine beam magnetic cores located between the two cover plate magnetic cores and equally spaced along the length direction of the cover plate magnetic cores; and eight sets of windings wound alternately in forward and reverse directions on the two cover plate magnetic cores to form... Phase inductance, Phase inductance, Phase inductance, Phase inductance, Phase inductance, Phase inductance, Phase inductance and Phase inductance; among which, Harmony for The two branch units below, Harmony for The two branch units below, Harmony for The two branch units below, Harmony for The two branch units below; Mutually, Mutually, Harmony The phases are different phases. Phase inductance and The phase inductance is the same phase inductance. Phase inductance and The phase inductance is the same phase inductance. Phase inductance and The phase inductance is the same phase inductance. Phase inductance and The phase inductance is the same phase inductance.

[0005] Preferably, the width of the crossbeam core shared between different phase inductors is reduced by half.

[0006] Preferably, each beam core has a butterfly-shaped structure, and the bottom of each beam core and the bottom of each winding are on the same horizontal line.

[0007] Preferably, the input terminals of the eight windings are all located on one side of the eight-in-one coupled inductor, and the output terminals of the eight windings are all located on the other side of the eight-in-one coupled inductor.

[0008] Preferably, each set of windings is wound on two cover plate magnetic cores in a manner where the windings are evenly distributed.

[0009] Preferably, the coupling method of the in-phase inductors is reverse coupling.

[0010] Preferably, the currents in the inductors of the same phase form magnetic fields in opposite directions, thereby canceling out the external magnetic fluxes of the eight-in-one coupled inductor.

[0011] Preferably, inductor The expression for inductance is: in, The first from left to right in the magnetoresistive model A side road, The number of turns in the winding. The magnetic reluctance of the cover plate core.

[0012] Preferably, the equivalent magnetic reluctance The expression is: in, The magnetic reluctance of the beam core. for or .

[0013] Preferably, the inductor matrix for: in, The magnitude of the inductance, This represents the magnitude of mutual inductance, and the value is positive. , , and The sign coefficient is ±1.

[0014] Preferably, when When the value is -1, the inductors in the same phase are reverse-coupled, and within one power frequency cycle... and The value can be:

[0015] Where θ is the phase angle.

[0016] This application also provides a converter including the eight-in-one coupled inductor as described above.

[0017] The eight-in-one coupled inductor and converter provided in this application can reduce the volume of the crossbeam core shared between inductors of different phases, effectively improving the power density of the system; it also forms magnetic fields in opposite directions through the current of the branch inductors of the same phase, so that the external magnetic flux cancels each other out, thereby reducing the external magnetic flux of the core and significantly improving the EMI performance of the system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a circuit topology diagram of a three-phase four-bridge-arm parallel voltage source inverter.

[0020] Figure 2 This is a schematic diagram of the structure of an eight-in-one coupled inductor according to an embodiment of this application.

[0021] Figure 3 for Figure 2 A schematic diagram of the explosion structure.

[0022] Figure 4 for Figure 2 A schematic diagram of the magnetic core structure.

[0023] Figure 5 for Figure 2 A schematic diagram of magnetic flux distribution.

[0024] Figure 6 for Figure 2 A schematic diagram of the magnetoresistive model. Detailed Implementation

[0025] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0026] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0027] Converters encompass devices that perform various forms of power conversion, including devices that convert DC to DC, DC to AC, AC to DC, and AC to AC. Inverters, which convert DC to AC, are a type of converter. As an example, a three-phase four-arm parallel voltage source inverter is a type of three-phase voltage source converter. The following detailed description uses the application of an eight-in-one coupled inductor in a three-phase four-arm parallel voltage source inverter as an example.

[0028] like Figure 1 As shown, the three-phase four-arm parallel voltage source inverter includes: a DC side, inverter module 1, and an AC side 2. The DC side is connected to the DC voltage source. Connected. The core of inverter module 1 is a four-arm inverter topology, where the first three arms correspond to the three phases (i.e., Mutually, Mutually, Phase), the fourth bridge arm is the neutral line bridge arm (i.e. (Phase 1); Each bridge arm achieves power conversion and control through the switching combinations of power switching devices. The output terminal of each phase bridge arm on the AC side 2 is connected to the corresponding phase inductor. , , , , , and the inductance of the neutral branch , ;inductance , After parallel connection, the three-phase four-bridge arm parallel voltage source inverter grid-side voltage is connected. ,inductance , After parallel connection, the three-phase four-bridge arm parallel voltage source inverter grid-side voltage is connected. ,inductance , After parallel connection, the three-phase four-bridge arm parallel voltage source inverter grid-side voltage is connected. ,inductance , After being connected in parallel, they are all connected to a three-phase AC system.

[0029] The three-phase four-arm parallel voltage source inverter uses control strategies such as pulse width modulation (PWM) of the power switches to complete the DC-to-AC power conversion and parallel connection. The specific working process is as follows: DC power input: DC voltage source Inputting DC power into the inverter forms an energy input port, providing the energy basis for subsequent power conversion.

[0030] Inverting process: The DC power is modulated using PWM technology by the ordered switching of power switching devices in the four-arm inverter topology. The first three arms generate three-phase AC voltage, and the fourth arm generates a neutral voltage component, thus realizing the conversion of DC power to three-phase AC power (including the neutral component) to meet the voltage and frequency requirements of the three-phase AC system.

[0031] AC Power Output and Parallel Connection: The three-phase AC power generated by the inverter passes through the filter inductors of each phase branch and is then connected in parallel to the three-phase AC system. The filter inductors filter the output current, reducing harmonic content and ensuring that the output current meets the power quality requirements of the AC system. Simultaneously, this enables the inverter to operate in parallel with the AC system, completing the transfer and distribution of electrical energy. Therefore, the filter inductors are used to suppress current harmonics, achieve smooth control of the output current, and enhance the system's stability and anti-interference capability.

[0032] like Figure 2 and combined Figure 3 As shown, this embodiment provides an eight-in-one coupled inductor, including: two cover plate magnetic cores 3 arranged opposite to each other, nine beam magnetic cores 4 located between the two cover plate magnetic cores 3 and evenly spaced along the length direction of the cover plate magnetic cores 3, and eight sets of windings 5 ​​wound on the two cover plate magnetic cores 3 in an alternating forward and reverse winding manner, forming... Phase inductance, Phase inductance, Phase inductance, Phase inductance, Phase inductance, Phase inductance, Phase inductance and Phase inductance.

[0033] in, Harmony for The two branch units below, Harmony for The two branch units below, Harmony for The two branch units below, Harmony for The two branch units below; Mutually, Mutually, Harmony The phases are different phases. Phase inductance and The phase inductance is the same phase inductance. Phase inductance and The phase inductance is the same phase inductance. Phase inductance and The phase inductance is the same phase inductance. Phase inductance and The phase inductance is the same phase inductance.

[0034] Here, all nine crossbeam cores 4 are in contact with the two cover plate cores 3, forming a complete core structure.

[0035] Preferably, each beam core has a butterfly-shaped structure. Specifically, the side view of each beam core is butterfly-shaped, and the bottom of each beam core (the bottom side is convex on both sides and concave in the middle) and the bottom of each winding group are on the same horizontal line. This increases the heat dissipation area of ​​the eight-in-one coupled inductor and improves efficiency. The beam core forms a leakage magnetic circuit, which reduces the coupling coefficient between two inductors in phase.

[0036] In this embodiment, the height of the beam core (i.e., the distance between the two cover cores for each beam core) and the length of the cover core are set according to the number of turns, width, and distance between each winding.

[0037] Nine crossbeam magnetic cores 4 are equally spaced along the length of the cover plate magnetic cores, and are named as follows: first crossbeam magnetic core 41, second crossbeam magnetic core 42, third crossbeam magnetic core 43, fourth crossbeam magnetic core 44, fifth crossbeam magnetic core 45, sixth crossbeam magnetic core 46, seventh crossbeam magnetic core 47, eighth crossbeam magnetic core 48, and ninth crossbeam magnetic core 49; wherein, the first crossbeam magnetic core 41 is located at one end of the two cover plate magnetic cores 3, and the ninth crossbeam magnetic core 49 is located at the other end of the two cover plate magnetic cores 3.

[0038] The two cover plate magnetic cores 3 are designated as: upper cover plate magnetic core 30 and lower cover plate magnetic core 31. The upper cover plate magnetic core 30 is designated sequentially along its length as: first upper cover plate magnetic core, second upper cover plate magnetic core, third upper cover plate magnetic core, fourth upper cover plate magnetic core, fifth upper cover plate magnetic core, sixth upper cover plate magnetic core, seventh upper cover plate magnetic core, and eighth upper cover plate magnetic core; the lower cover plate magnetic core 31 is designated sequentially along its length as: first lower cover plate magnetic core, second lower cover plate magnetic core, third lower cover plate magnetic core, fourth lower cover plate magnetic core, fifth lower cover plate magnetic core, sixth lower cover plate magnetic core, seventh lower cover plate magnetic core, and eighth lower cover plate magnetic core. Both the first upper cover plate magnetic core and the first lower cover plate magnetic core are located between the first crossbeam magnetic core 41 and the second crossbeam magnetic core 42.

[0039] The eight windings 5 ​​are respectively designated as: first winding, second winding, third winding, fourth winding, fifth winding, sixth winding, seventh winding, and eighth winding. All eight windings 5 ​​have the same number of turns and the same winding spacing. Each winding 5 is wound evenly on two cover plate magnetic cores 3. Specifically, the connection method can be either that the input terminal 50 of each winding 5 is first wound on the lower cover plate magnetic core 31 and then on the upper cover plate magnetic core 30 to form the output terminal 51, or that the input terminal 50 of each winding 5 is first wound on the upper cover plate magnetic core 30 and then on the lower cover plate magnetic core 31 to form the output terminal 51.

[0040] Figure 4 The diagram illustrates a wiring configuration where the input terminal 50 of each winding 5 is first wound with the lower cover plate magnetic core 31, then with the upper cover plate magnetic core 30, to form the output terminal 51. Specifically, the first winding first winds the first lower cover plate magnetic core, then the first upper cover plate magnetic core, thus forming... Phase inductance The second winding is first wound with the second lower cover plate core and then with the second upper cover plate core, thus forming... Phase inductance The third winding is first wound with the third lower cover plate core and then with the third upper cover plate core, thus forming... Phase inductance The fourth winding is first wound with the fourth lower cover plate core and then with the fourth upper cover plate core, thus forming... Phase inductance The fifth winding is first wound with the fifth lower cover plate core and then with the fifth upper cover plate core, thus forming... Phase inductance The sixth winding is first wound with the sixth lower cover plate core and then with the sixth upper cover plate core, thus forming... Phase inductance The seventh winding is formed by first winding the seventh lower cover plate core and then winding the seventh upper cover plate core. Phase inductance The eighth winding is formed by first winding the eighth lower cover plate core and then winding the eighth upper cover plate core. Phase inductance .

[0041] like Figure 4 As shown, the windings of the eight-in-one coupled inductor in this embodiment employ alternating forward and reverse windings, specifically: Phase inductance Using forward winding, Phase inductance Reverse winding Phase inductance Using forward winding, Phase inductance Reverse winding Phase inductance Using forward winding, Phase inductance Reverse winding Phase inductance Using forward winding, Phase inductance Reverse winding is adopted. As can be seen, the input terminals of all eight windings are located on one side of the eight-in-one coupled inductor in this embodiment, and the output terminals of all eight windings are located on the other side of the eight-in-one coupled inductor in this embodiment. This ensures that the coupling mode between the two windings in the same phase is reverse coupling, that is, the coupling mode of the inductors in the same phase is reverse coupling, which can reduce the inductor current ripple on the inverter side and effectively improve the efficiency of the inverter. Figure 4 The dashed arrows in the diagram represent the direction of magnetic flux. Blue represents the magnetic flux of phase a inductor, purple represents the magnetic flux of phase b inductor, orange represents the magnetic flux of phase c inductor, and green represents the magnetic flux of phase n inductor.

[0042] The eight-in-one coupled inductor structure in this embodiment can be regarded as being composed of four two-in-one inductors spliced ​​together.

[0043] by Harmony Taking one phase as an example, let's analyze the magnetic flux of the common core (i.e., the common beam core of adjacent inductors from different phases) of the eight-in-one coupled inductor in this embodiment. For the magnetic flux of the side post of the two-in-one inductor... and They are respectively: , (1)

[0044] in, The number of turns in the winding. For flowing through The inductance current of the phase inductor, For flowing through The inductance current of the phase inductor; Specifically, inductors or The inductance value, specifically, is calculated by determining the flux of the side column of the two-in-one inductor. hour, For inductance Inductance value; Calculate the flux of the side column of the two-in-one inductor hour, For inductance The inductance value.

[0045] After adopting the eight-in-one coupled inductor of this embodiment, Harmony magnetic flux of the common core for: (2)

[0046] Inductor current on the inverter side , , , , , , and The expression is: (3)

[0047] in, The amplitude of the current in each branch is given. The fundamental angular frequency, It is a time variable.

[0048] Inverter-side inductor current and The expression after superposition is: (4)

[0049] Therefore, the magnetic flux of the common core of the eight-in-one coupled inductor Amplitude and flux of the two-in-one inductor side column , The amplitudes are all the same, thus it can be seen that using the eight-in-one coupled inductor of this embodiment can reduce the volume of the common magnetic core by half, that is, the width of the beam magnetic core shared by different phase inductors is reduced. Reducing the size by half not only lowers the cost but also increases the power density of the system.

[0050] Understandable. Harmony The magnetic flux of the common core of the phase as well as Harmony The magnetic flux of the common core of the phase All can refer to the above. Harmony Phase common core flux The analytical methods used are therefore not elaborated upon here.

[0051] like Figure 5 As shown, in this embodiment, the currents in the in-phase branch inductors (i.e., the in-phase windings) of the eight-in-one coupled inductor form magnetic fields (magnetic flux) in opposite directions. and opposite directions, magnetic flux and opposite directions, magnetic flux and opposite directions, magnetic flux and (The directions are opposite), and their magnetic flux lines cancel each other out outside the inductor. Therefore, the external magnetic flux of the eight-in-one coupled inductor in this embodiment cancels each other out, thereby reducing the external magnetic flux density of the core, reducing the interference of the inductor's high-frequency operation on other electronic devices, and significantly improving the EMI performance of the system.

[0052] The inverter-side inductance matrix L is represented as: (5)

[0053] in, For inductance and Mutual intuition between them For inductance and The mutual attraction between them, ... For inductance and Mutual attraction between them.

[0054] like Figure 6 As shown in the magnetoresistive model, the definition is... The first from left to right in the magnetoresistive model There are 8 branch roads in total. Specifically, It is the first branch from left to right in the magnetoresistive model. It is the second branch from left to right in the magnetoresistive model. It is the third branch from left to right in the magnetoresistive model. It is the fourth branch from left to right in the magnetoresistive model. It is the 5th branch from left to right in the magnetoresistive model. It is the 6th branch from left to right in the magnetoresistive model. It is the 7th branch from left to right in the magnetoresistive model. It is the 8th branch from left to right in the reluctance model. The inductance is equal to the square of the number of turns in the winding divided by the corresponding reluctance. The expression for inductance is: (6)

[0055] Specifically, calculating inductance inductance Given a value of 1, calculate the inductance. inductance Given a value of 2, calculate the inductance. inductance Given a value of 3, calculate the inductance. inductance Given a value of 4, calculate the inductance. inductance Given a value of 5, calculate the inductance. inductance Given a value of 6, calculate the inductance. inductance Given a value of 7, calculate the inductance. inductance It is 8. Among them, The number of turns in the winding. The magnetic reluctance of the cover plate core; The magnetic reluctance of the beam core, equivalent magnetic reluctance ( for or , The expression for the value (1, 2, 3, 4, 5, 6, 7) is: (7)

[0056] Here, equation (7) is a recursive formula, in order to obtain the formula in equation (6) and ,in The following is a supplement. and The expression: , (8)

[0057] Similarly, it can be deduced that to The expression can be simplified to obtain the above formula (7).

[0058] definition The first from left to right in the magnetoresistive model Branch roads ( The value can be 1, 2, 3, 4, 5, 6, or 7. The first from left to right in the magnetoresistive model Branch roads ( The value of is 2, 3, 4, 5, 6, 7, 8), and Less than , specifically, and The correspondence is as follows: It is the first branch from left to right in the magnetoresistive model. It is the second branch from left to right in the magnetoresistive model. It is the third branch from left to right in the magnetoresistive model. It is the fourth branch from left to right in the magnetoresistive model. It is the 5th branch from left to right in the magnetoresistive model. It is the 6th branch from left to right in the magnetoresistive model. It is the 7th branch from left to right in the magnetoresistive model; and The correspondence is as follows: It is the second branch from left to right in the magnetoresistive model. It is the third branch from left to right in the magnetoresistive model. It is the fourth branch from left to right in the magnetoresistive model. It is the 5th branch from left to right in the magnetoresistive model. It is the 6th branch from left to right in the magnetoresistive model. It is the 7th branch from left to right in the magnetoresistive model. It is the 8th branch from left to right in the reluctance model. Mutual inductance. and The expression is: (9) (10)

[0059] Specifically, calculation and When p is 1 and q is 2, calculate the inductance. and When the inductance is p = 1 and q = 3, calculate the inductance. and When the inductance is p = 1 and q = 4, calculate the inductance. and When p is 1 and q is 5, calculate the inductance. and When the inductance is p = 1 and q = 6, calculate the inductance. and When the inductance is p = 1 and q = 7, calculate the inductance. and When the inductance is p = 1 and q = 8.

[0060] calculate and When the inductance is p = 2 and q = 3, calculate... and When the inductance is p = 2 and q = 4, calculate the inductance. and When p is 2 and q is 5, calculate the inductance. and When the inductance is p = 2 and q = 6, calculate the inductance. and When p is 2 and q is 7, calculate the inductance. and When the inductance is p = 2 and q = 8.

[0061] calculate and When the inductance is p = 3 and q = 4, calculate the inductance. and When the inductance is p = 3 and q = 5, calculate the inductance. and When the inductance is p = 3 and q = 6, calculate the inductance. and When p is 3 and q is 7, calculate the inductance. and When the inductance is p = 3 and q = 8.

[0062] calculate and When the inductance is p = 4 and q = 5, calculate the inductance. and When the inductance is p = 4 and q = 6, calculate the inductance. and When the inductance is p = 4 and q = 7, calculate the inductance. and When the inductance is p = 4 and q = 8.

[0063] calculate and When the inductance is p = 5 and q = 6, calculate the inductance. and When the inductance is p = 5 and q = 7, calculate the inductance. and When the inductance is p = 5 and q = 8.

[0064] calculate and When the inductance is p = 6 and q = 7, calculate the inductance. and When the inductance is p = 6 and q = 8.

[0065] calculate and When the inductance is p = 7 and q = 8.

[0066] in, It is the coupling coefficient, expressed as: (11)

[0067] Here, the count variable from Start retrieving values, until Finish.

[0068] For equations (6) to (10), when the number of turns in the winding reaches a certain value (e.g., 20 turns), the self-inductance of each branch is equal, and the mutual inductance of adjacent phases is also equal, that is... (12) (13)

[0069] At the same time, the coupling coefficient between inductors in non-adjacent branches is significantly smaller than that between inductors in adjacent branches, which means that the mutual inductance between non-adjacent branches can be ignored.

[0070] Therefore, the inductance matrix of equation (5) It can be simplified to: (14)

[0071] in, The magnitude of the inductance, This represents the magnitude of mutual inductance, and the value is positive. , , and The sign coefficient, with a value of ±1, is used to represent the coupling method between inductors. , , and A value of 1 indicates forward coupling. , , and Setting it to -1 indicates reverse coupling.

[0072] Preferably, , , and The value of is based on (the value of equations (15) to (18) is based on equation (3)): (15) (16) (17) (18)

[0073] like Figure 2The winding method shown is as follows: =-1, meaning that inductors in the same phase are coupled in opposite directions. The coupling mode between inductors in different phases changes with the direction of the inductor current. Figure 2 The wiring method shown in Table 1 provides the wiring data for one power frequency cycle. and The value of .

[0074] Table 1: and Values

[0075] in, It's the phase angle.

[0076] here, The value depends on the actual situation. and If the current directions are the same, then take -1; if and If the current direction is opposite, then take 1.

[0077] This embodiment also provides a converter, including the eight-in-one coupled inductor as described above.

[0078] The eight-in-one coupled inductor and converter provided in this embodiment can reduce the volume of the crossbeam core shared between inductors of different phases, effectively improving the power density of the system; it also forms magnetic fields in opposite directions through the current of the branch inductors of the same phase, so that the external magnetic flux cancels each other out, thereby reducing the external magnetic flux of the core and significantly improving the EMI performance of the system.

[0079] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An eight-in-one coupled inductor, characterized in that, include: Two cover plate magnetic cores are positioned opposite each other, and nine crossbeam magnetic cores are located between the two cover plate magnetic cores and are equally spaced along the length of the cover plate magnetic cores. Eight sets of windings are wound on the two cover plate magnetic cores in an alternating forward and reverse winding manner, forming... Phase inductance, Phase inductance, Phase inductance, Phase inductance, Phase inductance, Phase inductance, Phase inductance and Phase inductance; in, Harmony for The two branch units below, Harmony for The two branch units below, Harmony for The two branch units below, Harmony for The two branch units below; Mutually, Mutually, Harmony The phases are different phases. Phase inductance and The phase inductance is the same phase inductance. Phase inductance and The phase inductance is the same phase inductance. Phase inductance and The phase inductance is the same phase inductance. Phase inductance and The phase inductance is the same phase inductance.

2. The eight-in-one coupled inductor according to claim 1, characterized in that, The width of the crossbeam core shared between different phase inductors is reduced by half.

3. The eight-in-one coupled inductor according to claim 1, characterized in that, Each beam core has a butterfly-shaped structure, and the bottom of each beam core and the bottom of each winding are on the same horizontal line.

4. The eight-in-one coupled inductor according to claim 1, characterized in that, The input terminals of all eight windings are located on one side of the eight-in-one coupled inductor, and the output terminals of all eight windings are located on the other side of the eight-in-one coupled inductor.

5. The eight-in-one coupled inductor according to claim 1, characterized in that, The currents in the inductors of the same phase form magnetic fields in opposite directions, thereby canceling out the external magnetic flux of the eight-in-one coupled inductor.

6. The eight-in-one coupled inductor according to claim 1, characterized in that, inductance The expression for inductance is: in, The first from left to right in the magnetoresistive model A side road, The number of turns in the winding. The magnetic reluctance of the cover plate core; Equivalent magnetic reluctance The expression is: in, The magnetic reluctance of the beam core. for or .

7. The eight-in-one coupled inductor according to claim 1, characterized in that, Inductor matrix for: in, The magnitude of the inductance, This represents the magnitude of mutual inductance, and the value is positive. , , and The sign coefficient is ±1.

8. The eight-in-one coupled inductor according to claim 7, characterized in that, when When the value is -1, the inductors in the same phase are reverse-coupled, and within one power frequency cycle... and The value can be: in, It is the phase angle.

9. The eight-in-one coupled inductor according to claim 1, characterized in that, Each winding is wound on two cover plate cores in a way that the windings are evenly distributed, and the coupling method of the in-phase inductors is reverse coupling.

10. A converter, characterized in that, Includes the eight-in-one coupled inductor as described in any one of claims 1 to 9.

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