Three-phase DC inductor for parallel interleaved circuit

Abstract

The invention relates to the technical field of inductors, in particular to a three-phase DC inductor for a parallel interleaved circuit, which comprises an iron core assembly and a mounting assembly, the iron core assembly is arranged on the mounting assembly; the iron core assembly comprises an upper transverse yoke, a lower transverse yoke, a first main core column, a second main core column, a third main core column, a first auxiliary core column and a second auxiliary core column. The first main core column, the first auxiliary core column, the second main core column, the second auxiliary core column and the third main core column are sequentially arranged between the upper transverse yoke and the lower transverse yoke in the length direction. A first coil is wound outside the first main core column; a second coil is wound outside the second main core column; and a third coil is wound outside the third main core column. The three coils which are originally independent are respectively wound on the first main core column, the second main core column and the third main core column, so that three-phase inductance integration and a corresponding structure of the three coils and the three main core columns are realized, three channels of an interleaved parallel circuit can be directly adapted, and an additional independent inductor is not needed.

Description

Technical Field

[0001] This invention relates to the field of inductor technology, and more specifically to a three-phase DC inductor for parallel interleaved circuits. Background Technology

[0002] Energy storage systems and battery testing equipment often use AC-DC-DC circuit topology. In the DC-DC stage, when a single Buck converter outputs a large current, the increased stress on the device will cause many problems such as efficiency and heat. At the same time, in order to improve dynamic response, decoupling capacitors and a large number of output filter circuits are required, which will further increase the cost and size of the system. Therefore, when designing for low voltage and high current applications, an interleaved parallel structure is generally adopted. Its advantages are: (1) Under the same output efficiency, the interleaved parallel structure does not require a large inductor; (2) Under the condition that the switching frequency of each phase is constant, the frequency of the output voltage ripple increases with the increase of the number of phases, the total harmonic current of input and output decreases, and the total inductor current is the sum of the inductor currents of each phase; (3) The multi-phase parallel topology reduces the current stress borne by each phase, thereby increasing the freedom of selection, and is also conducive to heat management and packaging flexibility. Energy storage systems and battery testing equipment often employ multiple interleaved parallel structures and then connect them in parallel to increase the overall capacity. Each interleaved parallel structure typically consists of n channels, usually n is 2-4. The turn-on angle of the power transistors between each channel differs by 360° / n. Each channel is connected in series with a filter DC reactor at its rear end.

[0003] For example, such as Figure 1 As shown, when the topology is a 3-way interleaved parallel connection, there will be 3 DC inductors (inductor L1, inductor L2 and inductor L3) at the back end. Since the turn-on angles of the 3 power transistors (power transistor Q1, power transistor Q2 and power transistor Q3) differ by 120 degrees, the harmonic phases also differ by 120 degrees. When the 3 channels are output in parallel through the back end of the 3 DC inductors respectively, the harmonic currents cancel each other out due to the phase relationship, and the total harmonic current of the circuit will be significantly reduced.

[0004] However, currently, each output DC inductor in the interleaved parallel structure is independent and occupies a separate unit space, resulting in a relatively large size and high cost. Furthermore, there are currently no two-phase DC reactors available for use within the current technological scope. Therefore, the existing technology needs to be improved. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned shortcomings in the prior art by providing a three-phase DC inductor for parallel interleaved circuits.

[0006] The objective of this invention is achieved through the following technical solution: a three-phase DC inductor for parallel interleaved circuits, comprising a core assembly and a mounting assembly; the core assembly is disposed on the mounting assembly; The core assembly includes an upper transverse yoke, a lower transverse yoke, a first main core post, a second main core post, a third main core post, a first auxiliary core post, and a second auxiliary core post; the first main core post, the second main core post, the third main core post, the first auxiliary core post, and the second auxiliary core post are arranged in parallel; the first main core post, the first auxiliary core post, the second main core post, the second auxiliary core post, and the third main core post are arranged sequentially along the length direction between the upper transverse yoke and the lower transverse yoke; The first main core column is wound with a first coil; the second main core column is wound with a second coil; and the third main core column is wound with a third coil.

[0007] The present invention is further configured such that the upper transverse yoke and the lower transverse yoke are arranged in parallel; the upper transverse yoke is arranged perpendicular to the first main core column; One end of the upper transverse yoke is located at the top of the first main core column; the other end of the upper transverse yoke is located at the top of the third main core column; one end of the lower transverse yoke is located at the bottom of the first main core column; the other end of the lower transverse yoke is located at the bottom of the third main core column. The top of the first main core column, the top of the first auxiliary core column, the top of the second main core column, the top of the second auxiliary core column, and the top of the third main core column abut against the upper transverse yoke, respectively; the bottom of the first main core column, the bottom of the first auxiliary core column, the bottom of the second main core column, the bottom of the second auxiliary core column, and the bottom of the third main core column abut against the lower transverse yoke, respectively.

[0008] The present invention is further configured such that the first main core column is provided with a plurality of first air gap blocks along the height direction; the second main core column is provided with a plurality of second air gap blocks along the height direction; and the third main core column is provided with a plurality of third air gap blocks along the height direction.

[0009] The present invention is further configured such that both the upper and lower transverse yokes are formed by stacking multiple silicon steel sheets along the length direction; The first main core, the first secondary core, the second main core, the second secondary core, and the third main core are all made of multiple silicon steel sheets stacked along the height direction.

[0010] The present invention is further configured such that the first air gap block is disposed between two adjacent silicon steel sheets of the first main core column; the second air gap block is disposed between two adjacent silicon steel sheets of the second main core column; and the third air gap block is disposed between two adjacent silicon steel sheets of the third main core column.

[0011] The present invention is further configured such that the winding direction of the first coil is opposite to that of the second coil; and the winding direction of the first coil is the same as that of the third coil.

[0012] The present invention is further configured such that the three-phase DC inductor for the parallel interleaved circuit further includes a first input bus, a second input bus, a third input bus, a first output bus, a second output bus, a third output bus, and a connecting bus; the first input bus is connected to one end of the first coil; the other end of the first coil is connected to the first output bus; the second input bus is connected to one end of the second coil; the other end of the second coil is connected to the second output bus; the third input bus is connected to one end of the third coil; the other end of the third coil is connected to the third output bus; the first output bus, the second output bus, and the third output bus are respectively connected to the connecting bus; the connecting bus is provided with a wiring hole.

[0013] The present invention is further configured such that multiple first heat dissipation air channels are provided in the width direction in the first coil, the second coil and the third coil; the first heat dissipation air channels are provided in the length direction. Multiple second heat dissipation air ducts are provided between the first coil and the first main core, between the second coil and the second main core, and between the third coil and the third main core. Insulating plates are provided on both sides of the first main core column along the width direction, both sides of the second main core column along the width direction, and both sides of the third main core column along the width direction. Right-angled insulating air duct support strips are provided at the four corners of the first main core column, the four corners of the second main core column, and the four corners of the third main core column; first I-shaped insulating air duct support strips are provided at both ends of the first main core column along the length direction, both ends of the second main core column along the length direction, and both ends of the third main core column along the length direction; second I-shaped insulating air duct support strips are provided at the first heat dissipation air duct of the first coil, the second coil, and the third coil.

[0014] The present invention is further configured such that the mounting assembly includes an upper clamp, a lower clamp, a U-shaped top pressing member, a base, a longitudinal locking bolt, a transverse locking bolt, a tensioning block, and a shock-absorbing pad; The upper clamping member is clamped on both sides of the upper transverse yoke along the width direction, both sides of the first main core column along the width direction, both sides of the second main core column along the width direction, both sides of the third main core column along the width direction, both sides of the first auxiliary core column along the width direction, and both sides of the second auxiliary core column along the width direction; the lower clamping member is clamped on both sides of the lower transverse yoke along the width direction, both sides of the first main core column along the width direction, both sides of the second main core column along the width direction, both sides of the third main core column along the width direction, both sides of the first auxiliary core column along the width direction, and both sides of the second auxiliary core column along the width direction. The U-shaped top pressing member is located at the top of the upper transverse yoke; the tensioning block is located on the lower clamping member; the base is located at the bottom of the lower transverse yoke; the U-shaped top pressing member and the tensioning block are connected by longitudinal locking bolts; the upper transverse yoke and the lower transverse yoke are respectively fixedly connected to the upper clamping member and the lower clamping member by transverse locking bolts. The upper clamp is provided with product lifting holes; the shock-absorbing pad is installed at the bottom of the base.

[0015] The present invention is further configured such that the cross-sectional area of ​​the first main core column is the same as the cross-sectional area of ​​the third main core column; the number of turns of the first coil, the number of turns of the second coil, and the number of turns of the third coil are the same; and the cross-sectional area of ​​the second main core column is the sum of the cross-sectional areas of the first main core column and the third main core column.

[0016] The beneficial effects of this invention are as follows: By arranging the first main core, second main core, third main core, first auxiliary core, and second auxiliary core in parallel, with the first auxiliary core positioned between the first and second main cores and the second auxiliary core positioned between the second and third main cores, the magnetic circuits of the first, second, and third main cores can form a supplementary closed loop through the first and second auxiliary cores, reducing magnetic leakage. Simultaneously, the three originally independent coils are wound onto the first, second, and third main cores respectively, achieving three-way mutual inductance integration. The corresponding structure of the three coils and the three main cores can directly adapt to the three channels of an interleaved parallel circuit without the need for additional independent inductors. Furthermore, the main magnetic flux generated by the main core in the auxiliary core can partially or completely cancel each other out, thereby effectively reducing the cross-sectional area of ​​the auxiliary core, effectively saving costs and reducing volume. Attached Figure Description

[0017] The invention will be further illustrated with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the invention. For those skilled in the art, other drawings can be obtained based on the following drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of an AC-DC-DC circuit topology. Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the structure of the upper transverse yoke, lower transverse yoke, first main core column, second main core column, third main core column, first auxiliary core column, and second auxiliary core column in accordance with Embodiment 1 of the present invention. Figure 4 This is a top view of the first coil and the first main core post in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the magnetic flux flow direction in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the magnetic flux flow direction in Embodiment 2 of the present invention; Wherein: 11. Upper transverse yoke; 12. Lower transverse yoke; 13. First auxiliary core post; 14. Second auxiliary core post; 2. First main core post; 21. First coil; 22. First air gap block; 3. Second main core post; 31. Second coil; 32. Second air gap block; 4. Third main core post; 41. Third coil; 42. Third air gap block; 51. First inlet row; 52. Second inlet row; 53. Third inlet row; 54. First outlet row; 55. Second outlet row 56. Third outlet bar; 57. Connecting bar; 58. Wiring hole; 61. First heat dissipation duct; 62. Second heat dissipation duct; 63. Insulating clamp; 64. First I-shaped insulating duct support bar; 65. Second I-shaped insulating duct support bar; 66. Right-angle insulating duct support bar; 71. Upper clamp; 72. Lower clamp; 73. U-shaped top pressure piece; 74. Base; 75. Longitudinal locking bolt; 76. Horizontal locking bolt; 77. Tensioning block; 78. Shock-absorbing pad. Detailed Implementation

[0019] The present invention will be further described in conjunction with the following embodiments.

[0020] Example 1, by Figures 2 to 5 As can be seen, the three-phase DC inductor for parallel interleaved circuits described in this embodiment includes a core assembly and a mounting assembly; the core assembly is disposed on the mounting assembly; The core assembly includes an upper transverse yoke 11, a lower transverse yoke 12, a first main core post 2, a second main core post 3, a third main core post 4, a first auxiliary core post 13, and a second auxiliary core post 14; the first main core post 2, the second main core post 3, the third main core post 4, the first auxiliary core post 13, and the second auxiliary core post 14 are arranged in parallel; the first main core post 2, the first auxiliary core post 13, the second main core post 3, the second auxiliary core post 14, and the third main core post 4 are arranged sequentially along the length direction between the upper transverse yoke 11 and the lower transverse yoke 12; The first main core 2 is wound with a first coil 21; the second main core 3 is wound with a second coil 31; and the third main core 4 is wound with a third coil 41.

[0021] Specifically, the parallel interleaved circuit using a three-phase DC inductor in this embodiment is achieved by arranging the first main core 2, the second main core 3, the third main core 4, the first auxiliary core 13, and the second auxiliary core 14 in parallel, with the first auxiliary core 13 located between the first main core 2 and the second main core 3, and the second auxiliary core 14 located between the second main core 3 and the third main core 4. This allows the magnetic circuits of the first main core 2, the second main core 3, and the third main core 4 to form a supplementary closed loop through the first auxiliary core 13 and the second auxiliary core 14, reducing magnetic leakage. At the same time, the three originally independent coils are wound onto the first main core 2, the second main core 3, and the third main core 4 respectively, achieving three-phase mutual inductance integration. The corresponding structure of the three coils and the three main cores can directly adapt to the three channels of the interleaved parallel circuit without the need for additional independent inductors. This embodiment can replace the traditional three independent DC inductors, significantly reducing the space occupied by the whole machine and simplifying the internal layout of the equipment; in addition, the magnetic circuit is closed by the supplementary closure of the first auxiliary core column 13 and the second auxiliary core column 14, which reduces leakage magnetic loss, ensures the basic performance of the inductor, and at the same time reduces the number of independent components, reducing assembly complexity and cost.

[0022] In this embodiment, a three-phase DC inductor for a parallel interleaved circuit is described, wherein the upper yoke 11 and the lower yoke 12 are arranged in parallel; the upper yoke 11 is arranged perpendicular to the first main core column 2. One end of the upper transverse yoke 11 is located at the top of the first main core column 2; the other end of the upper transverse yoke 11 is located at the top of the third main core column 4; one end of the lower transverse yoke 12 is located at the bottom of the first main core column 2; the other end of the lower transverse yoke 12 is located at the bottom of the third main core column 4. The top of the first main core 2, the top of the first auxiliary core 13, the top of the second main core 3, the top of the second auxiliary core 14, and the top of the third main core 4 abut against the upper transverse yoke 11 respectively; the bottom of the first main core 2, the bottom of the first auxiliary core 13, the bottom of the second main core 3, the bottom of the second auxiliary core 14, and the bottom of the third main core 4 abut against the lower transverse yoke 12 respectively.

[0023] Specifically, the parallel interleaved circuit described in this embodiment uses a three-phase DC inductor, with the upper yoke 11 and lower yoke 12 arranged in parallel, and the upper yoke 11 arranged perpendicular to the first main core column 2, making the magnetic circuit path more regular; in addition, the upper yoke 11, lower yoke 12, first main core column 2 and third main core column 4 form a symmetrical square-shaped basic magnetic circuit to avoid uneven magnetic flux distribution.

[0024] The three-phase DC inductor for parallel interleaved circuits described in this embodiment has a first main core 2 with a plurality of first air gap blocks 22 along the height direction; a second main core 3 with a plurality of second air gap blocks 32 along the height direction; and a third main core 4 with a plurality of third air gap blocks 42 along the height direction.

[0025] Specifically, this embodiment enhances the overall heat dissipation effect by setting a first air gap block 22, a second air gap block 32, and a third air gap block 42.

[0026] In this embodiment, a three-phase DC inductor for a parallel interleaved circuit is described, wherein the upper yoke 11 and the lower yoke 12 are both formed by stacking multiple silicon steel sheets along the length direction. The first main core post 2, the first auxiliary core post 13, the second main core post 3, the second auxiliary core post 14, and the third main core post 4 are all made of multiple silicon steel sheets stacked along the height direction.

[0027] Specifically, the upper transverse yoke 11 and the lower transverse yoke 12 are stacked along the length direction, and the first main core column 2, the first secondary core column 13, the second main core column 3, the second secondary core column 14 and the third main core column 4 are stacked along the height direction, so that the magnetic flux flow direction is consistent with the grain orientation of the silicon steel sheet, further reducing hysteresis loss and eddy current loss.

[0028] In this embodiment, a three-phase DC inductor for a parallel interleaved circuit is provided, wherein the first air gap block 22 is disposed between two adjacent silicon steel sheets of the first main core column 2; the second air gap block 32 is disposed between two adjacent silicon steel sheets of the second main core column 3; and the third air gap block 42 is disposed between two adjacent silicon steel sheets of the third main core column 4.

[0029] This embodiment describes a three-phase DC inductor for a parallel interleaved circuit. The three-phase DC inductor further includes a first input bus 51, a second input bus 52, a third input bus 53, a first output bus 54, a second output bus 55, a third output bus 56, and a connecting bus 57. The first input bus 51 is connected to one end of a first coil 21; the other end of the first coil 21 is connected to the first output bus 54. The second input bus 52 is connected to one end of a second coil 31; the other end of the second coil 31 is connected to the second output bus 55. The third input bus 53 is connected to one end of a third coil 41; the other end of the third coil 41 is connected to the third output bus 56. The first output bus 54, the second output bus 55, and the third output bus 56 are respectively connected to the connecting bus 57; the connecting bus 57 is provided with a wiring hole 58. Specifically, the first input line 51, the second input line 52, and the third input line 53 are respectively connected to the three power transistors of the interleaved parallel circuit, adapting to the 120° turn-on phase difference of the two power transistors to ensure that the three currents are independently input to the coil; the first output line 54, the second output line 55, and the third output line are combined through the connecting line 57, so that the three currents are superimposed at the confluence point; the wiring hole 58 of the connecting line 57 facilitates connection to loads such as the positive terminal of the battery.

[0030] In this embodiment, a three-phase DC inductor for a parallel interleaved circuit is provided with multiple first heat dissipation ducts 61 along the width direction in the first coil 21, the second coil 31, and the third coil 41; the first heat dissipation ducts 61 extend along the length direction. Multiple second heat dissipation air ducts 62 are provided between the first coil 21 and the first main core 2, between the second coil 31 and the second main core 3, and between the third coil 41 and the third main core 4. Insulating plates 63 are provided on both sides of the first main core column 2 along the width direction, both sides of the second main core column 3 along the width direction, and both sides of the third main core column 4 along the width direction. Right-angled insulating air duct support strips 66 are provided at the four corners of the first main core column 2, the four corners of the second main core column 3, and the four corners of the third main core column 4; first I-shaped insulating air duct support strips 64 are provided at both ends of the first main core column 2 along the length direction, both ends of the second main core column 3 along the length direction, and both ends of the third main core column 4 along the length direction; second I-shaped insulating air duct support strips 65 are provided at the first heat dissipation air duct 61 for the first coil 21, the second coil 31, and the third coil 41.

[0031] Specifically, the first heat dissipation duct 61 can accelerate the dissipation of heat generated during coil operation, and the second heat dissipation duct 62 can isolate the heat transfer between the coil and the main core column to prevent heat from accumulating. The right-angled insulating duct support strip 66 and the I-shaped insulating duct support strip can fix the shape of the duct, ensure unobstructed airflow, and prevent the duct from being blocked due to component deformation. The insulating clamp 63 can achieve electrical isolation between the main core column and the coil to avoid the risk of leakage, and at the same time assist in fixing the main core column structure.

[0032] The three-phase DC inductor for parallel interleaved circuit described in this embodiment includes an upper clamp 71, a lower clamp 72, a U-shaped top pressing member 73, a base 74, a longitudinal locking bolt 75, a transverse locking bolt 76, a tensioning block 77, and a shock-absorbing pad 78. The upper clamp 71 is clamped on both sides of the upper transverse yoke 11 along the width direction, both sides of the first main core column 2 along the width direction, both sides of the second main core column 3 along the width direction, both sides of the third main core column 4 along the width direction, both sides of the first auxiliary core column 13 along the width direction, and both sides of the second auxiliary core column 14 along the width direction; the lower clamp 72 is clamped on both sides of the lower transverse yoke 12 along the width direction, both sides of the first main core column 2 along the width direction, both sides of the second main core column 3 along the width direction, both sides of the third main core column 4 along the width direction, both sides of the first auxiliary core column 13 along the width direction, and both sides of the second auxiliary core column 14 along the width direction. The U-shaped top pressing member 73 is located at the top of the upper transverse yoke 11; the tensioning block 77 is located on the lower clamping member 72; the base 74 is located at the bottom of the lower transverse yoke 12; the U-shaped top pressing member 73 and the tensioning block 77 are connected by longitudinal locking bolts 75; the upper transverse yoke 11 and the lower transverse yoke 12 are respectively fixedly connected to the upper clamping member 71 and the lower clamping member 72 by transverse locking bolts 76. The upper clamp 71 is provided with product lifting holes; the shock-absorbing pad 78 is installed at the bottom of the base 74.

[0033] Specifically, the upper clamp 71 and the lower clamp 72 clamp the upper transverse yoke 11, the lower transverse yoke 12, the first main core column 2, the second main core column 3, the third main core column 4, the first auxiliary core column 13, and the second auxiliary core column 14 in the width direction, ensuring that each core component is tightly against the ground and avoiding additional gaps in the magnetic circuit; the U-shaped top pressing component 73 cooperates with the longitudinal locking bolt 75 and the tensioning block 77 to apply pressure to each core component in the longitudinal direction, further ensuring the fit of the components; the base 74 bears the overall weight, and the shock-absorbing pad 78 can absorb the vibration during the operation of the equipment, preventing the components from loosening due to vibration; the lifting hole of the upper clamp 71 facilitates the transportation and installation of the inductor.

[0034] In this embodiment, a three-phase DC inductor for a parallel interleaved circuit is described. The winding direction of the first coil 21 is opposite to that of the second coil 31; the winding direction of the first coil 21 is the same as that of the third coil 41. In this embodiment, the cross-sectional areas of the first main core 2, the second main core 3, and the third main core 4 are the same; the number of turns of the first coil 21, the second coil 31, and the third coil 41 are the same.

[0035] Specifically, in this embodiment, the cross-sectional areas of the first main core column 2, the second main core column 3, and the third main core column 4 are the same; the number of turns of the first coil 21, the second coil 31, and the third coil 41 are the same, which ensures that the three-phase magnetic circuit impedances are completely consistent, adapting to the requirement of balanced current distribution in each phase of the three-way interleaved parallel circuit, avoiding the bias current phenomenon caused by excessive magnetic circuit impedance of a certain phase, and preventing damage to a single main core column or coil due to overload and overheating. In addition, with the design that the winding direction of the first coil 21 is opposite to that of the second coil 31, and the winding direction of the first coil 21 is the same as that of the third coil 41, the main magnetic flux Φ1 generated by the first main core column 2, the main magnetic flux Φ3 generated by the third main core column 4, and the main magnetic flux Φ2 generated by the second main core column 3 can form precise reverse superposition in the first auxiliary core column 13 and the second auxiliary core column 14: in the first auxiliary core column 13, Φ1 and Φ2 cancel each other out; in the second auxiliary core column 14, Φ3 and Φ2 cancel each other out. Based on the principle of "equal magnetic flux density in all parts of the iron core", the first sub-core 13 and the second sub-core 14 do not need to bear high magnetic flux density, and their cross-sectional area can be greatly reduced, ultimately achieving the integration effect of three independent DC inductors.

[0036] Example 2, as Figure 6 As shown in this embodiment, a three-phase DC inductor for a parallel interleaved circuit has the same cross-sectional area as the first main core 2 and the third main core 4; the number of turns of the first coil 21, the second coil 31, and the third coil 41 are the same; and the cross-sectional area of ​​the second main core 3 is the sum of the cross-sectional areas of the first main core 2 and the third main core 4.

[0037] Specifically, in this embodiment, the cross-sectional area of ​​the second main core column 3 is the sum of the cross-sectional areas of the first main core column 2 and the third main core column 4; so that the main magnetic flux Φ2 of the second main core column 3 is equal to the sum of the magnetic flux Φ1 of the first main core column 2 and the magnetic flux Φ3 of the third main core column 4. The magnetic flux Φ2 generated by the second main core 3 can be evenly distributed to the first auxiliary core 13 and the second auxiliary core 14 through a symmetrical structure. 0.5Φ2 flows through both the first auxiliary core 13 and the second auxiliary core 14. In addition, with the design that the winding direction of the first coil 21 is opposite to that of the second coil 31, and the winding direction of the first coil 21 is the same as that of the third coil 41, 0.5Φ2 in the first auxiliary core 13 cancels out Φ1 in the opposite direction, and 0.5Φ2 in the second auxiliary core 14 cancels out Φ3 in the opposite direction. Since the cross-sectional area of ​​the first main core 2 is the same as that of the third main core 4, and the number of turns of the first coil 21 is the same as that of the third coil 41, Φ1=Φ3. Ultimately, the effective magnetic flux of the first auxiliary core 13 and the second auxiliary core 14 is close to zero, and their cross-sectional area can be minimized based on the manufacturing process. This maintains the advantages of integrated volume reduction while avoiding local heating or magnetic saturation caused by excessively high magnetic flux density in the intermediate phase.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A three-phase DC inductor for a parallel interleaved circuit, characterized in that: It includes a core assembly and a mounting assembly; the core assembly is disposed on the mounting assembly; The core assembly includes an upper transverse yoke (11), a lower transverse yoke (12), a first main core post (2), a second main core post (3), a third main core post (4), a first auxiliary core post (13), and a second auxiliary core post (14); the first main core post (2), the second main core post (3), the third main core post (4), the first auxiliary core post (13), and the second auxiliary core post (14) are arranged in parallel; the first main core post (2), the first auxiliary core post (13), the second main core post (3), the second auxiliary core post (14), and the third main core post (4) are arranged sequentially along the length direction between the upper transverse yoke (11) and the lower transverse yoke (12); The first main core (2) is wound with a first coil (21); the second main core (3) is wound with a second coil (31); and the third main core (4) is wound with a third coil (41).

2. A three-phase DC inductor for a parallel interleaved circuit according to claim 1, characterized in that: The upper transverse yoke (11) and the lower transverse yoke (12) are arranged in parallel; the upper transverse yoke (11) is arranged perpendicular to the first main core column (2); One end of the upper transverse yoke (11) is located at the top of the first main core column (2); the other end of the upper transverse yoke (11) is located at the top of the third main core column (4); one end of the lower transverse yoke (12) is located at the bottom of the first main core column (2); the other end of the lower transverse yoke (12) is located at the bottom of the third main core column (4). The top of the first main core column (2), the top of the first auxiliary core column (13), the top of the second main core column (3), the top of the second auxiliary core column (14), and the top of the third main core column (4) abut against the upper transverse yoke (11); the bottom of the first main core column (2), the bottom of the first auxiliary core column (13), the bottom of the second main core column (3), the bottom of the second auxiliary core column (14), and the bottom of the third main core column (4) abut against the lower transverse yoke (12).

3. A three-phase DC inductor for a parallel interleaved circuit according to claim 1, characterized in that: The first main core column (2) is provided with a plurality of first air gap blocks (22) along the height direction; the second main core column (3) is provided with a plurality of second air gap blocks (32) along the height direction; and the third main core column (4) is provided with a plurality of third air gap blocks (42) along the height direction.

4. A three-phase DC inductor for a parallel interleaved circuit according to claim 3, characterized in that: The upper transverse yoke (11) and the lower transverse yoke (12) are both made of multiple silicon steel sheets stacked along the length direction; The first main core (2), the first auxiliary core (13), the second main core (3), the second auxiliary core (14) and the third main core (4) are all made of multiple silicon steel sheets stacked along the height direction.

5. A three-phase DC inductor for a parallel interleaved circuit according to claim 4, characterized in that: The first air gap block (22) is located between two adjacent silicon steel sheets of the first main core column (2); the second air gap block (32) is located between two adjacent silicon steel sheets of the second main core column (3); and the third air gap block (42) is located between two adjacent silicon steel sheets of the third main core column (4).

6. A three-phase DC inductor for a parallel interleaved circuit according to claim 1, characterized in that: The winding direction of the first coil (21) is opposite to that of the second coil (31); the winding direction of the first coil (21) is the same as that of the third coil (41).

7. A three-phase DC inductor for a parallel interleaved circuit according to claim 1, characterized in that: The parallel interleaved circuit three-phase DC inductor further includes a first input bus (51), a second input bus (52), a third input bus (53), a first output bus (54), a second output bus (55), a third output bus (56), and a connecting bus (57); the first input bus (51) is connected to one end of the first coil (21); the other end of the first coil (21) is connected to the first output bus (54); the second input bus (52) is connected to one end of the second coil (31); the other end of the second coil (31) is connected to the second output bus (55); the third input bus (53) is connected to one end of the third coil (41); the other end of the third coil (41) is connected to the third output bus (56); the first output bus (54), the second output bus (55), and the third output bus (56) are respectively connected to the connecting bus (57); the connecting bus (57) is provided with a wiring hole (58).

8. A three-phase DC inductor for a parallel interleaved circuit according to claim 1, characterized in that: Multiple first heat dissipation air ducts (61) are provided in the width direction of the first coil (21), the second coil (31) and the third coil (41); the first heat dissipation air ducts (61) are provided in the length direction. Multiple second heat dissipation air ducts (62) are provided between the first coil (21) and the first main core column (2), between the second coil (31) and the second main core column (3), and between the third coil (41) and the third main core column (4); Insulating clamps (63) are provided on both sides of the first main core column (2) along the width direction, on both sides of the second main core column (3) along the width direction, and on both sides of the third main core column (4) along the width direction. Right-angle insulating air duct support strips (66) are provided at the four corners of the first main core column (2), the four corners of the second main core column (3), and the four corners of the third main core column (4); first I-shaped insulating air duct support strips (64) are provided at both ends of the first main core column (2) along the length direction, both ends of the second main core column (3) along the length direction, and both ends of the third main core column (4) along the length direction; second I-shaped insulating air duct support strips (65) are provided at the first heat dissipation air duct (61) of the first coil (21), the second coil (31), and the third coil (41).

9. A three-phase DC inductor for a parallel interleaved circuit according to claim 1, characterized in that: The mounting assembly includes an upper clamp (71), a lower clamp (72), a U-shaped top pressure member (73), a base (74), a longitudinal locking bolt (75), a transverse locking bolt (76), a tensioning block (77), and a shock-absorbing pad (78); The upper clamp (71) is clamped on both sides of the upper transverse yoke (11) along the width direction, both sides of the first main core column (2) along the width direction, both sides of the second main core column (3) along the width direction, both sides of the third main core column (4) along the width direction, both sides of the first auxiliary core column (13) along the width direction, and both sides of the second auxiliary core column (14) along the width direction; the lower clamp (72) is clamped on both sides of the lower transverse yoke (12) along the width direction, both sides of the first main core column (2) along the width direction, both sides of the second main core column (3) along the width direction, both sides of the third main core column (4) along the width direction, both sides of the first auxiliary core column (13) along the width direction, and both sides of the second auxiliary core column (14) along the width direction; The U-shaped top pressing member (73) is located at the top of the upper transverse yoke (11); the tensioning block (77) is located on the lower clamping member (72); the base (74) is located at the bottom of the lower transverse yoke (12); the U-shaped top pressing member (73) and the tensioning block (77) are connected by longitudinal locking bolts (75); the upper transverse yoke (11) and the lower transverse yoke (12) are respectively fixedly connected to the upper clamping member (71) and the lower clamping member (72) by transverse locking bolts (76); The upper clamp (71) is provided with product lifting holes; the shock-absorbing pad (78) is installed at the bottom of the base (74).

10. A three-phase DC inductor for a parallel interleaved circuit according to claim 1, characterized in that: The cross-sectional area of ​​the first main core (2) is the same as that of the third main core (4); the number of turns of the first coil (21), the number of turns of the second coil (31) and the number of turns of the third coil (41) are the same; the cross-sectional area of ​​the second main core (3) is the sum of the cross-sectional areas of the first main core (2) and the third main core (4).

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