Choking device

Abstract

The choke device comprises a circuit board, an inductor structure and a capacitor structure, the inductance structure is provided with a magnetic core and four coils. The first coil and the third coil are respectively wound on the magnetic core, and starting ends and ending ends of the first coil and the third coil respectively extend out of the top surface and the bottom surface of the magnetic core. The second coil and the fourth coil are respectively wound on the magnetic core, and starting ends and ending ends of the second coil and the fourth coil respectively extend out of the bottom surface and the top surface of the magnetic core. The capacitor structure is provided with six capacitors. The first to third capacitors are connected together, and the fourth to sixth capacitors are connected together. The starting ends of the first and third coils are respectively connected with the first and fourth capacitors. The ending ends of the second and fourth coils are respectively connected with the third and sixth capacitors. The ending end of the first coil and the starting end of the second coil are connected with the second capacitor. The ending end of the third coil and the starting end of the fourth coil are connected with a fifth capacitor.

Description

Technical Field

[0001] The utility model relates to an inductor, in particular to a choke device. Background Art

[0002] Today, electronic devices are booming, and electronic devices generally require an external power supply to operate. However, the power transmission between electronic devices and power supplies often generates electromagnetic interference (such as noise). Therefore, in order to filter out electromagnetic interference, an electronic filter (such as a line filter or a choke) is generally installed between the electronic device and the power supply. In a choke, the components used to filter out electromagnetic interference are mainly common-mode inductors and differential-mode inductors, while the main components used to provide other functions (such as current limiting or reducing attenuation frequency response, etc.) may be non-inductive resistors. In order to improve the choke's ability to eliminate electromagnetic interference, other passive components besides the inductor may be configured in the choke, and the configuration relationship between other passive components and the inductor will also affect the choke's ability to eliminate electromagnetic interference. Therefore, how to improve the configuration relationship between other passive components and the inductor to improve the choke's ability to eliminate electromagnetic interference is an extremely important issue. Utility Model Content

[0003] In view of the above, the present invention provides a choke device. The choke device includes a circuit board, an inductor structure, and a capacitor structure. The inductor structure is located on the circuit board. The capacitor structure is located on the circuit board. The inductor structure includes a magnetic core, a first coil winding, and a second coil winding. The first coil winding includes a first coil and a second coil. The first coil is wound around the magnetic core so that a first starting end extends from the top surface of the magnetic core and a first ending end extends from the bottom surface of the magnetic core. The second coil is wound around the magnetic core so that a second starting end extends from the bottom surface of the magnetic core and a second ending end extends from the top surface of the magnetic core. The second coil winding includes a third coil and a fourth coil. The third coil is wound around the magnetic core so that a third starting end extends from the top surface of the magnetic core and a third ending end extends from the bottom surface of the magnetic core. The fourth coil is wound around the magnetic core so that a fourth starting end extends from the bottom surface of the magnetic core and a fourth ending end extends from the top surface of the magnetic core. The capacitor structure includes a first capacitor group and a second capacitor group. The first capacitor group includes a first capacitor, a second capacitor, and a third capacitor. One end of the first capacitor, the second capacitor, and the third capacitor are connected in common. The other end of the first capacitor is connected to the first starting end. The other end of the second capacitor, the first ending end, and the second starting end are connected in common. The other end of the third capacitor is connected to the second ending end. The second capacitor group includes a fourth capacitor, a fifth capacitor, and a sixth capacitor. One end of the fourth capacitor, the fifth capacitor, and the sixth capacitor are connected in common. The other end of the fourth capacitor is connected to the third starting end. The other end of the fifth capacitor, the third ending end, and the fourth starting end are connected in common. The other end of the sixth capacitor is connected to the fourth ending end.

[0004] In one embodiment of the present invention, the magnetic core has a plurality of coil areas, and the first coil, the second coil, the third coil, and the fourth coil are respectively wound around the plurality of coil areas.

[0005] In one embodiment of the present invention, the magnetic core has a plurality of coil areas, the first coil and the second coil are wound around one of the coil areas, and the third coil and the fourth coil are wound around another of the coil areas.

[0006] In one embodiment of the present invention, the coil turns of the first coil and the second coil are arranged at intervals, and the coil turns of the third coil and the fourth coil are arranged at intervals.

[0007] In an embodiment of the present invention, the first starting end and the third starting end form a first input and output end of the choke device, and the second ending end and the fourth ending end form a second input and output end of the choke device.

[0008] In one embodiment of the present invention, when a current is received via the first input / output terminal or the second input / output terminal, the first coil and the second coil form a non-inductive resistor, and the third coil and the fourth coil form a non-inductive resistor.

[0009] In one embodiment of the present invention, when the current is a common-mode current, the first coil and the third coil form a common-mode inductor, and the second coil and the fourth coil form a common-mode inductor.

[0010] In one embodiment of the present invention, when the current is a differential mode current, the first coil and the fourth coil form a differential mode inductor, and the second coil and the third coil form a differential mode inductor.

[0011] In an embodiment of the present invention, the one end of the first capacitor, the second capacitor, and the third capacitor, and the one end of the fourth capacitor, the fifth capacitor, and the sixth capacitor are connected to a ground terminal.

[0012] In one embodiment of the present invention, the first coil, the second coil, the third coil, and the fourth coil have the same number of turns.

[0013] In an embodiment of the present invention, the inductor structure and the capacitor structure are located on the same surface of the circuit board, and the capacitor structure is located between the inductor structure and the circuit board.

[0014] In an embodiment of the present invention, the circuit board includes a top surface and a bottom surface opposite to each other. The inductor structure is located on the top surface, and the capacitor structure is located on the bottom surface.

[0015] In summary, according to some embodiments, the present invention can enhance the ability of the choke device to eliminate electromagnetic interference (i.e., enhance the filtering ability). In some embodiments, the present invention can enhance the frequency response of the choke device (i.e., enhance the high-frequency filtering ability) through the first capacitor structure. In some embodiments, when current is generated, the present invention forms a common-mode inductor, a differential-mode inductor, or a non-inductive resistor according to different combinations of the first coil, the second coil, the third coil, and the fourth coil, thereby miniaturizing the choke device and satisfying the user's product requirements for miniaturized choke devices. In some embodiments, the present invention isolates the inductor structure from the capacitor structure through a circuit board to further enhance the filtering ability of the choke device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of a choke device according to a first embodiment of the present utility model;

[0017] Figure 2 is a rear view schematic diagram of a choke device according to a first embodiment of the present utility model;

[0018] Figure 3 is a front view schematic diagram of a choke device according to a first embodiment of the present utility model;

[0019] Figure 4 is a schematic diagram of the inductor structure of the choke device of the first embodiment of the present utility model;

[0020] Figure 5 Schematic diagram of the circuit board and capacitor structure of the choke device of the first embodiment of the present invention;

[0021] Figure 6 is a schematic diagram of an equivalent circuit of a choke device according to some embodiments of the present invention;

[0022] Figure 7 is a schematic diagram of an inductor structure according to a second embodiment of the present invention;

[0023] Figure 8 is a perspective schematic diagram of a choke device according to a third embodiment of the present invention;

[0024] Figure 9 is a schematic diagram of a circuit board and an inductor structure of a choke device according to a third embodiment of the present invention;

[0025] Figure 10 is a schematic diagram of a circuit board and capacitor structure of a choke device according to a third embodiment of the present invention;

[0026] Figure 11 This is a non-inductive resistor application circuit of a choke device according to some embodiments of the present invention;

[0027] Figure 12 This is a common-mode noise suppression application circuit of a choke device according to some embodiments of the present invention;

[0028] Figure 13 This is a differential mode noise suppression application circuit of a choke device according to some embodiments of the present invention;

[0029] Figures 14 to 19 This is a schematic diagram of experimental data of insertion loss of the choke device under different environments according to some embodiments of the present invention.

[0030]

Explanation of symbols

[0031] 10: Choke device

[0032] 20: Circuit Board

[0033] 21: Top surface

[0034] 23: Bottom surface

[0035] 25: Ground connection terminal

[0036] P1~P6: Contact

[0037] 30: Inductor structure

[0038] 31: Magnetic core

[0039] 311A: First coil area

[0040] 311B: Second coil area

[0041] 311C: Third coil area

[0042] 311D: Fourth coil area

[0043] 311E: Fifth coil area

[0044] 311F: Sixth coil area

[0045] 313:Central axis

[0046] 315A: Upper area

[0047] 315B: Lower area

[0048] 33: First coil winding

[0049] 331: First coil

[0050] ST1: First starting point

[0051] ET1: First End Point

[0052] CT1: first coil turn

[0053] 333: Second coil

[0054] ST2: Second starting point

[0055] ET2: Second terminal

[0056] CT2: Second coil turn

[0057] 35: Second coil winding

[0058] 351: The third coil

[0059] ST3: The third starting point

[0060] ET3: Third End

[0061] CT3: The third coil turn

[0062] 353: Fourth coil

[0063] ST4: The fourth starting point

[0064] ET4: The fourth terminal

[0065] CT4: fourth coil turn

[0066] 40: Capacitor structure

[0067] 41: first capacitor group

[0068] 411: first capacitor

[0069] 413: Second capacitor

[0070] 415: The third capacitor

[0071] 43: Second capacitor group

[0072] 431: Fourth capacitor

[0073] 433: Fifth capacitor

[0074] 435: Sixth capacitor

[0075] 50: Isolation board

[0076] 200: Power supply unit

[0077] 201: first power supply terminal

[0078] 203: Second power supply terminal

[0079] 300: External circuit

[0080] 301: first input terminal

[0081] 303: Second input terminal

[0082] GND: Ground terminal

[0083] SC: Stray capacitance

[0084] A1: Current direction

[0085] A2: Current direction

[0086] A3: Current direction

[0087] A4: Current direction

[0088] L1~L6: Curve DETAILED DESCRIPTION

[0089] Reference Figures 1 to 5 . Figure 1 It is a three-dimensional schematic diagram of the choke device 10 according to the first embodiment of the present invention. Figure 2 It is a rear view schematic diagram of the choke device 10 according to the first embodiment of the present invention. Figure 3 It is a front view schematic diagram of the choke device 10 of the first embodiment of the present invention. Figure 4 FIG. 1 is a schematic diagram of the inductor structure 30 of the choke device 10 according to the first embodiment of the present invention. Figure 5 Figure 2 is a schematic diagram of a circuit board 20 and a capacitor structure 40 of a choke device 10 according to a first embodiment of the present invention. The choke device 10 includes a circuit board 20, an inductor structure 30, and a capacitor structure 40. The circuit board 20 is, for example, a printed circuit board. The inductor structure 30 and the capacitor structure 40 are both located on the circuit board 20.

[0090] like Figure 4 As shown, the inductor structure 30 includes a magnetic core 31, a first coil winding 33, and a second coil winding 35. The magnetic core 31 may be a sintered magnetic metal oxide composed of an iron oxide mixture, such as a sintered magnetic manganese-zinc iron oxide or nickel-zinc iron oxide. The first coil winding 33 includes a first coil 331 and a second coil 333. The second coil winding 35 includes a third coil 351 and a fourth coil 353. The first coil 331, the second coil 333, the third coil 351, and the fourth coil 353 may be formed by winding metal wire around the magnetic core 31. The metal wire may be, for example, a single-core copper wire or a multi-core copper stranded wire. In some embodiments, the first coil 331, the second coil 333, the third coil 351, and the fourth coil 353 have the same number of turns.

[0091] like Figure 4As shown, a first coil 331 is wound around the magnetic core 31 so as to extend a first starting end ST1 from the top surface of the magnetic core 31 and a first ending end ET1 from the bottom surface of the magnetic core 31. A second coil 333 is wound around the magnetic core 31 so as to extend a second starting end ST2 from the bottom surface of the magnetic core 31 and a second ending end ET2 from the top surface of the magnetic core 31. A third coil 351 is wound around the magnetic core 31 so as to extend a third starting end ST3 from the top surface of the magnetic core 31 and a third ending end ET3 from the bottom surface of the magnetic core 31. A fourth coil 353 is wound around the magnetic core 31 so as to extend a fourth starting end ST4 from the bottom surface of the magnetic core 31 and a fourth ending end ET4 from the top surface of the magnetic core 31.

[0092] Reference Figures 1 to 6 . Figure 6 : This is a schematic diagram of an equivalent circuit of the choke device 10 according to some embodiments of the present invention. The capacitor structure 40 includes a first capacitor group 41 and a second capacitor group 43. The first capacitor group 41 includes a first capacitor 411, a second capacitor 413, and a third capacitor 415. The second capacitor group 43 includes a fourth capacitor 431, a fifth capacitor 433, and a sixth capacitor 435. The first capacitor 411, the second capacitor 413, the third capacitor 415, the fourth capacitor 431, the fifth capacitor 433, and the sixth capacitor 435 each include two ends (hereinafter referred to as the first end and the second end). The first ends of the first capacitor 411, the second capacitor 413, and the third capacitor 415 are connected to the external ground terminal GND via the traces in the circuit board 20. The second end of the first capacitor 411 is connected to the first starting end ST1 of the first coil 331. For example, the first starting end ST1 of the first coil 331 is connected to the contact P1 of the circuit board 20, and the contact P1 is connected to the second end of the first capacitor 411 via the traces in the circuit board 20. The second end of the second capacitor 413, the first end end ET1 of the first coil 331, and the second start end ST2 of the second coil 333 are connected together. For example, the first end end ET1 of the first coil 331 and the second start end ST2 of the second coil 333 are connected to contact point P2 of the circuit board 20, and contact point P2 is connected to the second end of the second capacitor 413 via a trace on the circuit board 20. The second end of the third capacitor 415 is connected to the second end end ET2. For example, the second end end ET2 of the second coil 333 is connected to contact point P3 of the circuit board 20, and contact point P3 is connected to the second end of the third capacitor 415 via a trace on the circuit board 20.

[0093] The first ends of the fourth capacitor 431, the fifth capacitor 433, and the sixth capacitor 435 are connected in common via a trace on the circuit board 20 and to an external ground terminal GND. The second end of the fourth capacitor 431 is connected to the third starting end ST3 of the third coil 351. For example, the third starting end ST3 of the third coil 351 is connected to contact P4 on the circuit board 20, and contact P4 is connected to the second end of the fourth capacitor 431 via a trace on the circuit board 20. The second end of the fifth capacitor 433, the third ending end ET3 of the third coil 351, and the fourth starting end ST4 of the fourth coil 353 are connected in common. For example, the third ending end ET3 of the third coil 351 and the fourth starting end ST4 of the fourth coil 353 are connected to contact P5 on the circuit board 20, and contact P5 is connected to the second end of the fifth capacitor 433 via a trace on the circuit board 20. The second end of the sixth capacitor 435 is connected to the fourth ending end ET4 of the fourth coil 353. For example, the fourth end terminal ET4 of the fourth coil 353 is connected to the contact point P6 of the circuit board 20, and the contact point P6 is connected to the second end of the sixth capacitor 435 via a trace on the circuit board 20. In this way, the first capacitor group 41 and the second capacitor group 43 can form a resonant circuit with the first coil winding 33 and the second coil winding 35, respectively, to improve the frequency response of the choke device 10 (i.e., enhance the high-frequency filtering capability).

[0094] like Figure 4 As shown, in some embodiments, the first coil winding 33 and the second coil winding 35 are separated from each other by a gap. As a result, there is a low stray capacitance between the first coil winding 33 and the second coil winding 35, so that the choke device 10 can have both good high-frequency filtering capabilities and low-frequency filtering capabilities.

[0095] like Figure 4 As shown, in some embodiments, the magnetic core 31 has multiple coil regions, and these coil regions are defined at different locations on the magnetic core 31 and do not overlap. In some embodiments, the first coil 331, the second coil 333, the third coil 351, and the fourth coil 353 are respectively wound around the multiple coil regions. The following description assumes that the magnetic core 31 has four coil regions (e.g., the first coil region 311A ​​to the fourth coil region 311D).

[0096] For example, the first coil 331 is wound around the first coil section 311A. The first coil 331 winds clockwise from the top left end of the magnetic core 31 through a first starting end ST1, first from the top surface of the magnetic core 31 to the bottom surface of the magnetic core 31, then from the bottom surface of the magnetic core 31 to the top surface of the magnetic core 31. The winding reaches the center of the top side of the magnetic core 31 (i.e., from left to right), with a first end end ET1 extending from the bottom surface of the magnetic core 31. The second coil 333 is wound around the second coil section 311B. The second coil 333 winds clockwise from the center of the top side of the magnetic core 31 through a second starting end ST2, first from the bottom surface of the magnetic core 31 to the top surface of the magnetic core 31, then from the top surface of the magnetic core 31 to the bottom surface of the magnetic core 31. The winding reaches the right end of the top side of the magnetic core 31 (i.e., from left to right), with a second end end ET2 extending from the top surface of the magnetic core 31. The third coil 351 is wound around the third coil section 311C. The third coil 351 winds clockwise from the left end of the lower side of the magnetic core 31 through the third starting end ST3, first from the top surface of the magnetic core 31 to the bottom surface of the magnetic core 31, then from the bottom surface of the magnetic core 31 to the top surface of the magnetic core 31. It winds clockwise to the center of the lower side of the magnetic core 31 (i.e., from left to right), with a third ending end ET3 extending from the bottom surface of the magnetic core 31. The fourth coil 353 is wound around the fourth coil section 311D. The fourth coil 353 winds clockwise from the center of the lower side of the magnetic core 31 through the fourth starting end ST4, first from the bottom surface of the magnetic core 31 to the top surface of the magnetic core 31, then from the top surface of the magnetic core 31 to the bottom surface of the magnetic core 31. It winds clockwise to the right end of the lower side of the magnetic core 31 (i.e., from left to right), with a fourth ending end ET4 extending from the top surface of the magnetic core 31.

[0097] Thus, the first end end ET1 of the first coil 331 is adjacent to the second start end ST2 of the second coil 333, and the first start end ST1 of the first coil 331 is away from the second end end ET2 of the second coil 333. The third end end ET3 of the third coil 351 is adjacent to the fourth start end ST4 of the fourth coil 353, and the third start end ST3 of the third coil 351 is away from the fourth end end ET4 of the fourth coil 353. The first start end ST1 of the first coil 331 is adjacent to the third start end ST3 of the third coil 351, and the second end end ET2 of the second coil 333 is adjacent to the fourth end end ET4 of the fourth coil 353.

[0098] like Figure 4As shown, in some embodiments, the first coil section 311A ​​and the fourth coil section 311D are both located between the second coil section 311B and the third coil section 311C. The second coil section 311B and the third coil section 311C are both located between the first coil section 311A ​​and the fourth coil section 311D. The first coil section 311A ​​and the fourth coil section 311D are not adjacent to each other, and the second coil section 311B and the third coil section 311C are not adjacent to each other. Thus, the first coil 331 and the fourth coil 353 are both located between the second coil 333 and the third coil 351, and the second coil 333 and the third coil 351 are both located between the first coil 331 and the fourth coil 353. Furthermore, the first coil 331 and the fourth coil 353 are not adjacent to each other, and the second coil 333 and the third coil 351 are not adjacent to each other.

[0099] like Figure 4 As shown, in some embodiments, adjacent coil areas (e.g., the first coil area 311A ​​and the second coil area 311B) are separated from each other by a gap, so that the coils wound therein (e.g., the first coil 331 and the second coil 333) are also separated from each other due to the gap and have a lower stray capacitance value, so that the choke device 10 can have good high-frequency filtering capabilities and low-frequency filtering capabilities at the same time.

[0100] like Figure 4As shown, in some embodiments, the first coil winding 33 and the second coil winding 35 are symmetrical to each other. For example, the magnetic core 31 is divided into an upper region 315A and a lower region 315B along its central axis 313. The first coil winding 33 is located in the upper region 315A of the magnetic core 31, and the second coil winding 35 is located in the lower region 315B of the magnetic core 31. The first coil 331 of the first coil winding 33 is symmetrical to the third coil 351 of the second coil winding 35 about the central axis 313 of the magnetic core 31. The second coil 333 of the first coil winding 33 is symmetrical to the fourth coil 353 of the second coil winding 35 about the central axis 313 of the magnetic core 31. Specifically, the first coil 331 and the third coil 351 are offset to the same side (e.g., the left side) of the upper region 315A and the lower region 315B of the magnetic core 31, respectively. The first starting end ST1 of the first coil 331 and the third starting end ST3 of the third coil 351 are both located at the same end (e.g., the left end) of the first coil 331 and the third coil 351, respectively, and both extend from the top surface of the magnetic core 31. The first ending end ET1 of the first coil 331 and the third ending end ET3 of the third coil 351 are both located at the same end (e.g., the right end) of the first coil 331 and the third coil 351, respectively, and both extend from the bottom surface of the magnetic core 31. Thus, the first coil 331 is symmetrical with the third coil 351. The second coil 333 and the fourth coil 353 are offset to the same side (e.g., the right side) of the upper region 315A and the lower region 315B of the magnetic core 31, respectively. The second starting end ST2 of the second coil 333 and the fourth starting end ST4 of the fourth coil 353 are both located at the same end (e.g., the left end) of the second coil 333 and the fourth coil 353, respectively, and both extend from the bottom surface of the magnetic core 31. The second ending end ET2 of the second coil 333 and the fourth ending end ET4 of the fourth coil 353 are both located at the same end (e.g., the right end) of the second coil 333 and the fourth coil 353, respectively, and both extend from the top surface of the magnetic core 31. Thus, the second coil 333 is symmetrical with the fourth coil 353.

[0101] Reference Figure 7 , is a schematic diagram of an inductor structure 30 according to a second embodiment of the present invention. In some embodiments, the first coil 331 and the second coil 333 are wound around one of the multiple coil regions, while the third coil 351 and the fourth coil 353 are wound around another of the multiple coil regions. The following description assumes that the magnetic core 31 has two coil regions (e.g., the fifth coil region 311E and the sixth coil region 311F).

[0102] For example, the first coil 331 and the second coil 333 are both wound around the fifth coil section 311E. The first coil 331 is wound clockwise from the top left end of the magnetic core 31 through a first starting end ST1, first from the top surface of the magnetic core 31 to the bottom surface of the magnetic core 31, and then from the bottom surface of the magnetic core 31 to the top surface of the magnetic core 31. The winding reaches the top right end of the magnetic core 31 (i.e., from left to right), with a first end end ET1 extending from the bottom surface of the magnetic core 31. The second coil 333 is wound clockwise from the top right end of the magnetic core 31 through a second starting end ST2, first from the bottom surface of the magnetic core 31 to the top surface of the magnetic core 31, and then from the top surface of the magnetic core 31 to the bottom surface of the magnetic core 31. The winding reaches the top left end of the magnetic core 31 (i.e., from right to left), with a second end end ET2 extending from the top surface of the magnetic core 31. The third coil 351 and the fourth coil 353 are both wound around the sixth coil section 311F. The third coil 351 winds from the right end of the lower side of the magnetic core 31 through the third starting end ST3, first from the top surface of the magnetic core 31 to the bottom surface of the magnetic core 31, then from the bottom surface of the magnetic core 31 to the top surface of the magnetic core 31. It winds to the left at the lower left end of the magnetic core 31 (i.e., from right to left), with a third ending end ET3 extending from the bottom surface of the magnetic core 31. The fourth coil 353 winds from the left end of the lower side of the magnetic core 31 through the fourth starting end ST4, first from the bottom surface of the magnetic core 31 to the top surface of the magnetic core 31, then from the top surface of the magnetic core 31 to the bottom surface of the magnetic core 31. It winds to the right at the right end of the lower side of the magnetic core 31 (i.e., from left to right), with a fourth ending end ET4 extending from the top surface of the magnetic core 31.

[0103] Thus, the first end end ET1 of the first coil 331 is adjacent to the second start end ST2 of the second coil 333, and the first start end ST1 of the first coil 331 is adjacent to the second end end ET2 of the second coil 333. The third end end ET3 of the third coil 351 is adjacent to the fourth start end ST4 of the fourth coil 353, and the third start end ST3 of the third coil 351 is adjacent to the fourth end end ET4 of the fourth coil 353. The first start end ST1 of the first coil 331 and the second end end ET2 of the second coil 333 are adjacent to the third end end ET3 of the third coil 351 and the fourth start end ST4 of the fourth coil 353, and the first end end ET1 of the first coil 331 and the second start end ST2 of the second coil 333 are adjacent to the third start end ST3 of the third coil 351 and the fourth end end ET4 of the fourth coil 353.

[0104] like Figure 7As shown, in some embodiments, the first coil 331 and the second coil 333 wound in the same coil zone have opposite winding directions, and the third coil 351 and the fourth coil 353 wound in the same coil zone have opposite winding directions. For example, the first coil 331 is wound from left to right, and the second coil 333 is wound from right to left. The third coil 351 is wound from right to left, and the fourth coil 353 is wound from left to right.

[0105] like Figure 7 As shown, in some embodiments, the coil turns of the first coil 331 and the second coil 333 wound in the same coil zone are arranged alternately, and the coil turns of the third coil 351 and the fourth coil 353 wound in the same coil zone are arranged alternately. For example, from the left end to the right end of the fifth coil zone 311E (i.e., from left to right), the coil turns of the first coil 331 (hereinafter referred to as the first coil turn CT1) and the coil turns of the second coil 333 (hereinafter referred to as the second coil turn CT2) are arranged in the order of "first coil turn CT1, second coil turn CT2, first coil turn CT1, second coil turn CT2, first coil turn CT1, second coil turn CT2, first coil turn CT1, second coil turn CT2, first coil turn CT1, second coil turn CT2, etc." From the right end to the left end of the sixth coil section 311F (i.e., from right to left), the coil turns of the third coil 351 (hereinafter referred to as the third coil turn CT3) and the coil turns of the fourth coil 353 (hereinafter referred to as the fourth coil turn CT4) are arranged in the order of “third coil turn CT3, fourth coil turn CT4, third coil turn CT3, fourth coil turn CT4, third coil turn CT3, fourth coil turn CT4, third coil turn CT3, fourth coil turn CT4, third coil turn CT3, fourth coil turn CT4…etc.”

[0106] In some embodiments, the magnetic core 31 can be implemented by a closed magnetic core or a non-closed magnetic core. In some embodiments, when the magnetic core 31 is implemented by a closed magnetic core, the closed magnetic core can be a circular magnetic core (such as Figure 7 As shown), elliptical core, rectangular core (as Figure 4 As shown), EE type core or other shapes of closed core.

[0107] Reference Figure 6 and Figures 8 to 10 . Figure 8 It is a three-dimensional schematic diagram of a choke device 10 according to the third embodiment of the present invention. Figure 9 FIG. 1 is a schematic diagram of a circuit board 20 and an inductor structure 30 of a choke device 10 according to a third embodiment of the present invention. Figure 10FIG2 is a schematic diagram of the circuit board 20 and capacitor structure 40 of the choke device 10 according to the third embodiment of the present invention. In some embodiments, the first end terminal ET1 of the first coil 331 and the second start terminal ST2 of the second coil 333 can be integrated (e.g., twisted) into a single terminal and connected to the second end of the second capacitor 413 via the contact P2 and a trace on the circuit board 20. The third end terminal ET3 of the third coil 351 and the fourth start terminal ST4 of the fourth coil 353 can be integrated (e.g., twisted) into a single terminal and connected to the second end of the fifth capacitor 433 via the contact P5 and a trace on the circuit board 20.

[0108] like Figures 1 to 3 As shown, in some embodiments, the inductor structure 30 and the capacitor structure 40 are located on the same surface of the circuit board 20, and the capacitor structure 40 is located between the inductor structure 30 and the circuit board 20. However, the present invention is not limited thereto. Figures 8 to 10 As shown, in some embodiments, the circuit board 20 includes opposing top and bottom surfaces 21 and 23. The inductor structure 30 is located on the top surface 21 of the circuit board 20, and the capacitor structure 40 is located on the bottom surface 23 of the circuit board 20. In other words, the circuit board 20 is located between the inductor structure 30 and the capacitor structure 40. In this way, the circuit board 20 isolates the inductor structure 30 from the capacitor structure 40 to prevent mutual interference between the inductor structure 30 and the capacitor structure 40, thereby improving the electromagnetic interference elimination capability (i.e., improving the filtering capability) of the choke device 10.

[0109] like Figures 1 to 3 As shown, in some embodiments, the choke device 10 further includes an isolation plate 50. The isolation plate 50 is, for example, an insulating plate. The isolation plate 50 is located at the bottom of the inductor structure 30 to isolate the inductor structure 30 from the capacitor structure 40, thereby preventing mutual interference between the inductor structure 30 and the capacitor structure 40 and improving the choke device 10's ability to eliminate electromagnetic interference.

[0110] In some embodiments, the circuit board 20, the inductor structure 30, and the capacitor structure 40 can be encapsulated in a housing to form an electronic module, and the first starting end ST1, the second ending end ET2, the third starting end ST3, and the fourth ending end ET4 are used as external connection terminals of the electronic module. In some embodiments, the external connection terminals of the electronic module also include a ground connection terminal 25 (such as Figure 9 and Figure 10As shown), the first terminals of the first capacitor 411, the second capacitor 413, the third capacitor 415, the fourth capacitor 431, the fifth capacitor 433, and the sixth capacitor 435 are connected to the external ground terminal GND. In some embodiments, the first starting terminal ST1 of the first coil 331 and the third starting terminal ST3 of the third coil 351 form the first input and output terminals of the choke device 10 (i.e., the first input and output terminal group of the external connection terminals of the electronic module) to connect to the corresponding circuit elements. The second ending terminal ET2 of the second coil 333 and the fourth ending terminal ET4 of the fourth coil 353 form the second input and output terminals of the choke device 10 (i.e., the second input and output terminal group of the external connection terminals of the electronic module) to connect to the corresponding circuit elements. In this way, the choke device 10 can eliminate electromagnetic interference.

[0111] Reference Figure 6 and Figure 11 . Figure 11 This is a non-inductive resistor application circuit for the choke device 10 according to some embodiments of the present invention. The following describes a non-inductive resistor application circuit, a common-mode noise suppression application circuit, and a differential-mode noise suppression application circuit, with the first input / output terminal of the choke device 10 connected to the power supply device 200 and the second input / output terminal of the choke device 10 connected to an external filtering circuit (hereinafter referred to as the external circuit 300). The first starting end ST1 of the first coil 331 is connected to the first power supply terminal 201 of the power supply device 200, and the third starting end ST3 of the third coil 351 is connected to the second power supply terminal 203 of the power supply device 200. The second ending end ET2 of the second coil 333 is connected to the first input terminal 301 of the external circuit 300. The fourth ending end ET4 of the fourth coil 353 is connected to the second input terminal 303 of the external circuit 300.

[0112] like Figure 6 and Figure 11As shown, in some embodiments, when the choke device 10 receives current through the first input / output terminal or the second input / output terminal, the first coil 331 and the second coil 333 form a non-inductive resistor, and the third coil 351 and the fourth coil 353 form a non-inductive resistor. For example, the current generated by the power supply device 200 (hereinafter referred to as the power current) flows from the first power supply terminal 201 through the first coil 331 and the second coil 333 to the first input terminal 301 of the external circuit 300. It then flows from the second input terminal 303 of the external circuit 300 through the fourth coil 353 and the third coil 351 to the second power supply terminal 203 of the power supply device 200. Because the first coil 331 and the second coil 333 generate magnetic fields in opposite directions, they cancel each other out and no inductive reactance is generated. In other words, the first coil 331 and the second coil 333 are resistors without inductive reactance (e.g., having only the resistance of the coils) or with only a small inductance due to leakage inductance. This means that the first coil 331 and the second coil 333 form essentially non-inductive resistors. Similarly, the third coil 351 and the fourth coil 353 also form essentially non-inductive resistors due to the magnetic fields they generate in opposite directions. This allows non-inductive resistors to be used for functions required by the external circuit 300 (e.g., current limiting, frequency response reduction, etc.).

[0113] Reference Figure 6 and Figure 12 . Figure 12 This is a common-mode noise suppression application circuit of the choke device 10 according to some embodiments of the present invention. In some embodiments, when the choke device 10 receives a common-mode current through the first input-output terminal or the second input-output terminal, the first coil 331 and the third coil 351 form a common-mode inductor, and the second coil 333 and the fourth coil 353 form a common-mode inductor. For example, when the external circuit 300 is connected to the ground terminal GND (for example, the shell of the external circuit 300 is grounded), since there is a stray capacitance SC between the external circuit 300 and the ground terminal GND, stray signals (such as common-mode noise, also called common-mode current) are generated between the first power supply terminal 201 of the power supply device 200 and the ground terminal GND and between the second power supply terminal 203 and the ground terminal GND. The common-mode current includes a first stray current generated by the first power supply terminal 201 of the power supply device 200 through the stray capacitance SC and a second stray current generated by the second power supply terminal 203 of the power supply device 200 through the stray capacitance SC. The current direction A1 of the first stray current (at Figure 12 The direction of the second stray current A2 is the same as that of the second stray current (indicated by a dotted chain line). Figure 12(Indicated by a two-dot chain line in FIG. 1 ). A first stray current flows from the first power supply terminal 201 of the power supply device 200 through the first coil 331 and the second coil 333, then to the first input terminal 301 of the external circuit 300, and then returns to the power supply device 200 via the ground terminal GND. A second stray current flows from the second power supply terminal 203 of the power supply device 200 through the third coil 351 and the fourth coil 353, then to the second input terminal 303 of the external circuit 300, and then returns to the power supply device 200 via the ground terminal GND. At this time, the first coil 331 and the third coil 351 generate magnetic fields in the same direction, which increases the inductance of the first coil 331 and the third coil 351, thereby increasing the inductive reactance that suppresses common-mode current (in other words, the first coil 331 and the third coil 351 now form a common-mode inductor). Similarly, the second coil 333 and the fourth coil 353 also generate magnetic fields in the same direction, which increases the inductive reactance that suppresses common-mode current. In this way, the effect of filtering out common mode noise can be achieved.

[0114] Reference Figure 6 and Figure 13 . Figure 13 This is a differential mode noise suppression application circuit of the choke device 10 according to some embodiments of the present invention. In some embodiments, when the choke device 10 receives a differential mode current via the first input / output terminal or the second input / output terminal, the first coil 331 and the fourth coil 353 form a differential mode inductor, and the second coil 333 and the third coil 351 form a differential mode inductor. For example, noise (i.e., differential mode noise, also called differential mode current) may be generated between the first power supply terminal 201 and the second power supply terminal 203 of the power supply device 200. The current direction A3 of the differential mode current (at Figure 13 The current direction A4 (indicated by a dotted chain line in FIG) is the same as the power current of the power supply device 200 Figure 13 (Indicated by a two-dot chain line in the figure). The differential-mode current flows from the first power supply terminal 201 through the first coil 331 and the second coil 333 to the first input terminal 301 of the external circuit 300. It then flows from the second input terminal 303 of the external circuit 300 through the fourth coil 353 and the third coil 351 to the second power supply terminal 203 of the power supply device 200. At this point, the first coil 331 and the fourth coil 353 generate magnetic fields in the same direction, increasing their inductance and, therefore, the inductive reactance that suppresses the differential-mode current (in other words, the first coil 331 and the fourth coil 353 now form a differential-mode inductor). Similarly, the second coil 333 and the third coil 351 also generate magnetic fields in the same direction, increasing the inductive reactance that suppresses the differential-mode current. This effectively filters out differential-mode noise.

[0115] As can be seen from the above, the inductor structure 30 of the choke device 10 has a simple coil winding structure, and can therefore be automatically wound by a winding machine, thereby improving product production efficiency and reducing mutual interference between coil windings.

[0116] Reference Figures 14 to 19 , is a diagram of experimental data of the insertion loss of the choke device 10 in different environments according to some embodiments of the present invention. Curve L1 is the insertion loss of the choke device 10 suitable for large current (such as 10 amperes). Curve L2 is the insertion loss of the choke device 10 suitable for medium current (such as 8 amperes). Curves L3 to L6 are the insertion losses of the choke device 10 suitable for small current (such as 3 amperes) in different environments. Figures 14 to 19 It can be seen that the choke device 10 suitable for different current sizes has good insertion loss performance under different environments.

[0117] In summary, according to some embodiments, the present invention can enhance the ability of the choke device to eliminate electromagnetic interference (i.e., enhance the filtering ability). In some embodiments, the present invention can enhance the frequency response of the choke device (i.e., enhance the high-frequency filtering ability) through the first capacitor structure. In some embodiments, when current is generated, the present invention forms a common-mode inductor, a differential-mode inductor, or a non-inductive resistor according to different combinations of the first coil, the second coil, the third coil, and the fourth coil, thereby miniaturizing the choke device and satisfying the user's product requirements for miniaturized choke devices. In some embodiments, the present invention isolates the inductor structure from the capacitor structure through a circuit board to further enhance the filtering ability of the choke device.

Claims

1. A choke device, characterized in that: Include: a circuit board; An inductor structure is located on the circuit board, and the inductor structure includes: a magnetic core; a first coil winding, comprising a first coil and a second coil, the first coil being wound around the magnetic core so as to extend a first starting end from the top surface of the magnetic core and a first ending end from the bottom surface of the magnetic core, the second coil being wound around the magnetic core so as to extend a second starting end from the bottom surface of the magnetic core and a second ending end from the top surface of the magnetic core; and a second coil winding, comprising a third coil and a fourth coil, the third coil being wound around the magnetic core so as to extend a third starting end from the top surface of the magnetic core and a third ending end from the bottom surface of the magnetic core, and the fourth coil being wound around the magnetic core so as to extend a fourth starting end from the bottom surface of the magnetic core and a fourth ending end from the top surface of the magnetic core; and A capacitor structure is located on the circuit board, and the capacitor structure includes: a first capacitor group, comprising a first capacitor, a second capacitor, and a third capacitor, wherein one end of the first capacitor, the second capacitor, and the third capacitor are connected in common, the other end of the first capacitor is connected to the first starting end, the other end of the second capacitor, the first ending end, and the second starting end are connected in common, and the other end of the third capacitor is connected to the second ending end; and A second capacitor group includes a fourth capacitor, a fifth capacitor, and a sixth capacitor. One end of the fourth capacitor, the fifth capacitor, and the sixth capacitor are connected in common. The other end of the fourth capacitor is connected to the third starting end. The other end of the fifth capacitor, the third ending end, and the fourth starting end are connected in common. The other end of the sixth capacitor is connected to the fourth ending end.

2. The choke device according to claim 1, characterized in that The magnetic core is provided with a plurality of coil areas, and the first coil, the second coil, the third coil and the fourth coil are respectively wound around the plurality of coil areas.

3. The choke device according to claim 1, wherein The magnetic core is provided with a plurality of coil areas. The first coil and the second coil are wound around one of the plurality of coil areas, and the third coil and the fourth coil are wound around another one of the plurality of coil areas.

4. The choke device according to claim 3, characterized in that The coil turns of the first coil and the second coil are arranged at intervals, and the coil turns of the third coil and the fourth coil are arranged at intervals.

5. The choke device according to claim 1, wherein The first starting end and the third starting end form a first input and output end of the choke device, and the second ending end and the fourth ending end form a second input and output end of the choke device.

6. The choke device according to claim 5, characterized in that When a current is received via the first input / output terminal or the second input / output terminal, the first coil and the second coil form a non-inductive resistor, and the third coil and the fourth coil form a non-inductive resistor.

7. The choke device according to claim 6, characterized in that When the current is a common mode current, the first coil and the third coil form a common mode inductor, and the second coil and the fourth coil form a common mode inductor.

8. The choke device according to claim 6, characterized in that When the current is a differential mode current, the first coil and the fourth coil form a differential mode inductor, and the second coil and the third coil form a differential mode inductor.

9. The choke device according to claim 1, wherein The one end of the first capacitor, the second capacitor, and the third capacitor, and the one end of the fourth capacitor, the fifth capacitor, and the sixth capacitor are connected to a ground terminal.

10. The choke device according to claim 1, wherein The first coil, the second coil, the third coil and the fourth coil have the same number of turns.

11. The choke device according to claim 1, wherein The inductor structure and the capacitor structure are located on the same surface of the circuit board, and the capacitor structure is located between the inductor structure and the circuit board.

12. The choke device according to claim 1, wherein The circuit board comprises a top surface and a bottom surface opposite to each other. The inductor structure is located on the top surface, and the capacitor structure is located on the bottom surface.

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