Inductor and circuit board

Abstract

The utility model discloses an inductor and a circuit board, the inductor comprises a base, a magnetic core arranged on the base and a coil wound on the magnetic core, a hollow part is arranged at the position, corresponding to the coil, of the base, at least part of the coil is located in the hollow part, and the coil is arranged in the hollow part. The bottom of the coil is flush with the bottom of the base or exceeds the bottom of the base. According to the inductor, the magnetic core wound with the coil is placed in the hollow part of the base, and the bottom of the coil is flush with or exceeds the bottom of the base, so that when the inductor is mounted on a radiator, the coil can be in contact with the radiator before the base or the coil and the base are in contact with the radiator at the same time; therefore, the coil of the inductor can be in direct contact with the radiator, and the radiator directly radiates heat of the coil of the inductor, so that the heat radiation performance of the inductor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic power, in particular to an inductor and a circuit board. Background Art

[0002] A high-current inductor is an electronic component that can withstand the passage of large currents and has a high inductance value. It is usually used in DC circuits and can be used in circuits such as voltage stabilization, noise reduction, and filtering.

[0003] In the process of implementing the utility model, the inventors found that there are at least the following problems in the prior art:

[0004] Currently, inductors are installed on circuit boards after the coil is assembled through a base. This method causes the base to first contact the heat sink at the bottom of the inductor, rather than the copper wire of the coil, thus affecting the heat dissipation performance. Utility Model Content

[0005] The utility model provides an inductor and a circuit board, which can improve the heat dissipation performance of the inductor.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] In a first aspect, an embodiment of the utility model provides an inductor, comprising a base, a magnetic core arranged on the base, and a coil wound on the magnetic core, wherein a hollow portion is provided at a position on the base corresponding to the coil, at least a portion of the coil is located in the hollow portion, and the bottom of the coil is flush with the bottom of the base or exceeds the bottom of the base.

[0008] Optionally, the base includes two mounting parts located at both ends and an isolation part connected between the two mounting parts; the mounting parts are respectively provided with storage positions, and the opposite ends of the coil are respectively provided with pins, and the pins are accommodated in the storage positions, and the storage positions are provided with through pin holes for the corresponding pins to pass through and protrude from the bottom of the base.

[0009] Optionally, the storage position includes a first bottom plate and a folded edge extending from an edge of the first bottom plate, the first bottom plate and the folded edge together define the storage position, the pins are correspondingly accommodated in the storage position, and the pin holes are provided on the first bottom plate.

[0010] Optionally, the pin includes a first section located in the storage position and a second section connected to the first section at a certain angle, and the second section is inserted into the pin hole.

[0011] Optionally, the mounting portion further includes bearing positions for mounting the two ends of the magnetic core, the bearing positions including a second bottom plate and a side plate arranged on the second bottom plate, and the second bottom plate and the side plate jointly define a storage space for accommodating the ends of the magnetic core.

[0012] Optionally, the isolation portion includes a partition connected to the second bottom plates, the coil includes two, and the partition is located between the two coils.

[0013] Optionally, the mounting portion is further provided with a false foot hole for placing a false foot, and the false foot is used to connect the inductor to a circuit board.

[0014] In a second aspect, an embodiment of the utility model further provides a circuit board, comprising the inductor described in the first aspect, wherein the circuit board is provided with a through hole through which the hollow portion of the inductor passes.

[0015] Optionally, the circuit board also includes a heat sink, which includes a heat sink base and a plurality of heat sinks formed on the heat sink base. The inductor is arranged on a side of the heat sink base away from the heat sink, and the bottom surface of the portion of the coil located in the hollow portion is attached to the heat sink base.

[0016] Optionally, the heat dissipation base plate includes a silicone pad disposed on a side close to the inductor, and the bottom of the coil is in contact with the silicone pad.

[0017] Compared with the prior art, the technical solution provided by the utility model has at least the following beneficial effects: a magnetic core wound with a coil is placed in the hollow portion of the base, so that the bottom of the coil is flush with or exceeds the bottom of the base, so that when the inductor is installed on the radiator, the coil can contact the radiator before the base, or the coil and the base can contact the radiator at the same time, thereby ensuring that the coil of the inductor can directly contact the radiator, and the radiator directly dissipates heat from the coil of the inductor, thereby improving the heat dissipation performance of the inductor.

[0018] In the above embodiments, the circuit board and the corresponding inductor embodiments belong to the same concept, and thus have the same technical effects as the corresponding inductor embodiments, which will not be described in detail herein.

[0019] In addition to the above-described purposes, features and advantages, the embodiments of the present utility model have other purposes, features and advantages. The embodiments of the present utility model will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the embodiments of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0021] Figure 1 is a structural schematic diagram of an inductor according to an embodiment of the utility model from one perspective;

[0022] Figure 2 is a structural schematic diagram of an inductor according to an embodiment of the utility model from another perspective;

[0023] Figure 3 is an exploded diagram of an inductor according to an embodiment of the utility model;

[0024] Figure 4 It is a partial structural schematic diagram of a circuit board according to an embodiment of the utility model.

[0025] The symbols in the figure represent:

[0026] 1. Magnetic core; 2. Coil; 21. Pin; 211. First section; 212. Second section; 3. Base; 31. Hollow portion; 32. Mounting portion; 321. Storage position; 3211. Pin hole; 3212. First bottom plate; 3213. Folding edge; 322. Load-bearing position; 3221. Second bottom plate; 3222. Side plate; 323. False foot hole; 33. Isolation portion; 4. False foot; 5. Circuit board; 51. Through hole; 6. Radiator; 61. Heat dissipation bottom plate; 62. Heat sink; 63. Silicone pad. DETAILED DESCRIPTION

[0027] The following is a further detailed description of the technical solution of the utility model embodiment in conjunction with the accompanying drawings and specific embodiments of the specification. In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application should be the usual meanings understood by the general technicians in the field to which this application belongs. The words "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inside", "outside" and other words indicating orientation used in the description of this application are only used to indicate the relative direction or positional relationship, and do not imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, so it cannot be understood as a limitation to this application. The "first", "second", "third" and similar terms used in the description of this application are only used for descriptive purposes to distinguish different components, and cannot be understood as indicating or implying relative importance. The similar words "one", "one" or "the" used in the description of this application should not be understood as an absolute limitation on quantity, but should be understood as the existence of at least one. The words “include” or “comprising” and the like used in the description of this application mean that the elements or objects preceding the words include the elements or objects listed after the words and their equivalents, but do not exclude other elements or objects.

[0028] It should also be noted that, unless otherwise clearly specified and limited, the words "installed", "connected", "connected" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0029] like Figures 1 to 3 As shown, the inductor of this embodiment includes a base 3, a magnetic core 1 arranged on the base 3, and a coil 2 wound on the magnetic core 1. A hollow portion 31 is provided at a position on the base 3 corresponding to the coil 2. At least a part of the coil 2 is located in the hollow portion 31, and the bottom of the coil 2 is flush with the bottom of the base 3 or exceeds the bottom of the base 3.

[0030] In this embodiment, the magnetic core 1 wound with the coil 2 is placed on the base 3, and the coil 2 is located in the hollow portion 31 of the base 3, so that the bottom of the coil 2 is flush with the bottom of the base 3 or exceeds the bottom of the base 3, and the bottom of the coil 2 and the bottom of the base 3 refer to the surfaces released from the heat sink 6, so that when the inductor is installed on the heat sink 6, it is ensured that the coil 2 of the inductor directly contacts the heat sink 6, thereby improving the heat dissipation performance of the inductor.

[0031] Optionally, the inductor is a common-mode inductor, including two coils 2 of the same size and the same number of turns symmetrically wound on the same magnetic core 1 to form a four-terminal device. The common-mode inductor in the circuit board 5 is mainly used to eliminate common-mode interference in the circuit. When the normal current in the circuit flows through the common-mode inductor, the current generates reverse magnetic fields in the coils 2 wound in the same phase and cancel each other out. At this time, the normal signal current is mainly affected by the resistance of the coil 2 (and a small amount of damping caused by leakage inductance); when a common-mode current flows through the coil 2, due to the isotropic nature of the common-mode current, a magnetic field in the same direction will be generated in the coil 2, increasing the inductive reactance of the coil 2, making the coil 2 appear as a high impedance and producing a strong damping effect, thereby attenuating the common-mode current and achieving the purpose of filtering.

[0032] Optionally, the base 3 includes two mounting portions 32 located at both ends and an isolation portion 33 connected between the two mounting portions; the mounting portions 32 are respectively provided with storage positions 321, and the opposite ends of the coil 2 are respectively provided with pins 21, and the pins 21 are accommodated in the storage positions 321. The storage positions 321 are provided with penetrating pin holes 3211 for the corresponding pins 21 to pass through and protrude from the bottom of the base 3.

[0033] Specifically, when the magnetic core 1 wound with the coil 2 is placed on the base 3, the two pins 21 of the coil 2 are arranged in the storage position 321, and the pins 21 protrude from the bottom of the base 3 through the pin holes 3211 to facilitate the connection between the pins 21 and the circuits on the circuit board 5.

[0034] Optionally, the storage position 321 includes a first bottom plate 3212 and a folded edge 3213 extending from the edge of the first bottom plate 3212. The first bottom plate 3212 and the folded edge 3213 together define the storage position 321. The pin 21 is correspondingly accommodated in the storage position 321. The pin hole 3211 is provided on the first bottom plate 3212. The storage position 321 is used to guide and limit the pin 21, thereby facilitating the installation of the coil 2 and preventing the coil 2 from shifting.

[0035] Optionally, the pin 21 includes a first section 211 located in the storage position 321 and a second section 212 connected to the first section 211 at a certain angle, and the second section 212 is inserted into the pin 0 hole 3211 .

[0036] When the coil 2 and the magnetic core 1 are installed on the base 3, the coil 2 is dropped into the hollow portion 31, and then the pin 21 is placed into the storage position 321. The storage position 321 guides the pin 21 to enter and limits the radial displacement of the pin 21. The first section 211 of the pin 21 is placed on the first bottom plate 3212 of the storage position 321, and the second section 212 of the pin 21 is inserted into the pin hole 3211. By connecting the first section 211 of the pin 21 to different heights of the coil 2, the sinking height of the coil 2 can be limited.

[0037] In the present embodiment, two flat wire pins 21 are welded to the coil 2, and the two flat wire pins 21 are respectively arranged at the two ends of the coil 2. In other embodiments, the pins 21 can also be formed by extending the two ends of the wire of the coil 2 to the outside of the magnetic core 1. The pins 21 are used for connecting and conducting the coil 2 with the circuit board 5. Therefore, the head and tail pins of the coil 2 are directly straightened and bent down to form the flat wire pins 21, which is convenient for processing and does not require additional materials.

[0038] Optionally, the mounting portion 32 further includes bearing positions 322 respectively provided at both ends of the magnetic core 1, the bearing positions 322 include a second bottom plate 3221 and a side plate 3222 provided on the second bottom plate 3221, and the second bottom plate 3221 and the side plate 3222 jointly define a storage space for accommodating the ends of the magnetic core 1.

[0039] Specifically, the second bottom plate 3221 and the side plates 3222 are perpendicular to each other. The two second bottom plates 3221 are the bottom of the base 3 and are used to support the magnetic core 1. A hollow portion 31 bottom is formed between the two second bottom plates 3221 for the bottom of the coil 2 to pass through. The two side plates 3222 are used to limit the displacement of the magnetic core 1.

[0040] Optionally, the isolation portion 33 includes a partition connected between the second bottom plates 3221 , and the partition is located between the two coils 2 .

[0041] The magnetic core 1 consists of a group of longitudinal magnetic cores and a group of transverse magnetic cores. The two coils 2 are symmetrically wound on the two longitudinal magnetic cores. The two ends of the two longitudinal magnetic cores are connected by two transverse magnetic cores. The two transverse magnetic cores are arranged on the second bottom plate 3221 of the bearing position 322. The partition is perpendicular to the second bottom plate 3221 of the bearing position 322. The partition passes through the middle of the two longitudinal magnetic cores. The partition is used to limit the displacement of the magnetic core 1.

[0042] In some embodiments, the mounting portion 32 is further provided with a false foot hole 323 for placing a false foot 4 , and the false foot 4 is used to connect the inductor to the circuit board 5 .

[0043] Specifically, when the inductor is connected to the circuit board 5 , the false foot 4 is inserted into the false foot hole 323 , and the false foot 4 passes through the mounting portion 32 and is connected to the circuit board 5 , so that the inductor is firmly connected to the circuit board 5 .

[0044] The inductor provided in the above embodiments of the present application has at least the following characteristics:

[0045] 1. Place the magnetic core 1 wound with the coil 2 on the base 3, and use the side plates 3222 of the bearing position 322 and the partitions of the isolation portion 33 to jointly limit the radial displacement of the magnetic core 1, thereby ensuring the stability of the magnetic core 1.

[0046] 2. The pins 21 at both ends of the coil 2 are inserted into the pin holes 3211 of the receiving position 321. The receiving position 321 can guide the installation of the coil 2 and limit the radial displacement of the coil 2, further improving the stability of the inductor.

[0047] 3. When the magnetic core 1 wound with the coil 2 is stably mounted on the base 3, the bottom of the coil 2 is flush with the bottom of the base 3 or exceeds the bottom of the base 3. When the inductor is mounted on the circuit board 5, the bottom of the coil 2 can directly contact the surface of the radiator, thereby improving the heat dissipation performance of the inductor.

[0048] like Figure 4 As shown, on the other hand, the embodiment of the present application further provides a circuit board, including the inductor of the embodiment of the present application, and the circuit board 5 is provided with a through hole 51 for the hollow portion 31 of the inductor to pass through.

[0049] When the inductor is installed on the circuit board 5, the hollow part 31 of the inductor, the through hole 51 through which the magnetic core 1 and the coil 2 pass, and the mounting part 32 of the base 3 of the inductor will be placed on the circuit board 5, the pin 21 of the coil 2 will pass through the pin hole 3211 and be connected to the line on the circuit board 5, the false foot 4 will be inserted into the false foot hole 323, and the false foot 4 will pass through the mounting part 32 and be connected to the circuit board 5, so that the inductor is firmly connected to the circuit board 5.

[0050] In some embodiments, the circuit board also includes a heat sink 6, which includes a heat sink base plate 61 and a plurality of heat sinks 62 formed on the heat sink base plate 61. The inductor is arranged on a side of the heat sink base plate 61 away from the heat sink 62, and the bottom surface of the portion of the coil 2 located in the hollow portion 31 is attached to the heat sink base plate 61.

[0051] Optionally, the heat dissipation base plate 61 includes a silicone pad 63 disposed on a side close to the inductor, and the bottom of the coil 2 is in contact with the silicone pad 63 .

[0052] The silicone pad 63 better protects the radiator and the inductor without affecting the heat dissipation of the inductor. In this embodiment, the bottom of the coil 2 of the inductor is flush with the bottom of the base 3, and the bottom of the coil 2 and the bottom of the base 3 are both arranged on the silicone pad 63. In other embodiments, only the bottom of the coil 2 can be arranged on the silicone pad 63, and the base 3 can be arranged on the radiator 6 along the silicone pad 63.

[0053] The circuit board of this embodiment can effectively ensure that the inductor has good heat dissipation performance while meeting the basic electrical performance requirements.

[0054] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An inductor, characterized in that: The invention comprises a base (3), a magnetic core (1) arranged on the base (3), and a coil (2) wound on the magnetic core (1); a hollow portion (31) is provided at a position on the base (3) corresponding to the coil (2); at least a portion of the coil (2) is located in the hollow portion (31); and the bottom of the coil (2) is flush with the bottom of the base (3) or exceeds the bottom of the base (3).

2. The inductor according to claim 1, characterized in that The base (3) comprises two mounting portions (32) located at two ends and an isolation portion (33) connected between the two mounting portions; The mounting portion (32) is provided with a storage position (321), and the opposite ends of the coil (2) are provided with pins (21), the pins (21) are received in the storage position (321), and the storage position (321) is provided with a through pin hole (3211) for the corresponding pin (21) to pass through and protrude from the bottom of the base (3).

3. The inductor according to claim 2, characterized in that The storage position (321) includes a first bottom plate (3212) and a folded edge (3213) extending from an edge of the first bottom plate (3212); the first bottom plate (3212) and the folded edge (3213) together define the storage position (321); the pin (21) is correspondingly received in the storage position (321); and the pin hole (3211) is provided on the first bottom plate (3212).

4. The inductor according to claim 3, characterized in that The pin (21) comprises a first section (211) located in the storage position (321) and a second section (212) connected to the first section (211) at a certain angle, and the second section (212) is inserted into the pin hole (3211).

5. The inductor according to claim 2, characterized in that The mounting portion (32) further comprises bearing positions (322) for mounting at both ends of the magnetic core (1), the bearing positions (322) comprising a second bottom plate (3221) and a side plate (3222) provided on the second bottom plate (3221), the second bottom plate (3221) and the side plate (3222) jointly defining a storage space for accommodating the end portions of the magnetic core (1).

6. The inductor according to claim 5, characterized in that The isolation portion (33) comprises a partition connected to the second bottom plate (3221), the coil (2) comprises two, and the partition is located between the two coils (2).

7. The inductor according to claim 2, characterized in that The mounting portion (32) is also provided with a false foot hole (323) for placing a false foot (4), and the false foot (4) is used to connect the inductor to the circuit board (5).

8. A circuit board, characterized in that: The inductor comprises the inductor according to any one of claims 1 to 7, wherein the circuit board (5) is provided with a through hole (51) through which the hollow portion (31) of the inductor passes.

9. The circuit board according to claim 8, characterized in that: The invention also comprises a heat sink (6), the heat sink (6) comprising a heat sink base plate (61) and a plurality of heat sinks (62) formed on the heat sink base plate (61), the inductor being arranged on a side of the heat sink base plate (61) away from the heat sinks (62), and the bottom surface of the portion of the coil (2) located in the hollow portion (31) being in contact with the heat sink base plate (61).

10. The circuit board according to claim 9, characterized in that: The heat dissipation base plate (61) comprises a silicone pad (63) arranged on a side close to the inductor, and the bottom of the coil (2) is in contact with the silicone pad (63).

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