A tlvr coupled inductor and power module

Abstract

The utility model discloses a TLVR coupling inductor and power module belong to electronic component technical field. TLVR coupling inductor includes magnetic core, primary coil and secondary coil, and the magnetic core is wrapped part primary coil and part secondary coil, and the first terminal PIN pin of first pin end portion of primary coil and the second terminal PIN pin of second pin end portion of secondary coil are all exposed from the first side of magnetic core along the first direction, primary coil still includes first body, two first pins are all connected with first body, and first body is exposed from the second side of magnetic core along the first direction, and the heat dissipation effect of TLVR coupling type inductor is good, and the performance and reliability are guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of electronic components technology, and in particular to a TLVR coupled inductor and power module. Background Technology

[0002] TLVR (Trans-Inductor Voltage Regulator) is a novel voltage regulation structure. A TLVR-coupled inductor is a voltage regulator that uses the primary terminal of a transformer as its output inductance, maintaining voltage stability under transient load changes. Compared to traditional inductors, TLVR-coupled inductors offer advantages such as low losses, a wide operating temperature range, fast transient response, and small size, making them particularly suitable for low-voltage, high-current environments. However, when a large DC current flows through the TLVR-coupled inductor, significant heat is generated inside, reducing its efficiency and potentially affecting the performance of surrounding electronic components.

[0003] When TLVR coupled inductors are used in power modules (such as CPU / GPU power supplies), the electronic components are arranged in a compact manner. For example, multi-phase parallel TLVR coupled inductors are usually densely packed, resulting in limited heat dissipation space and poor heat dissipation performance of TLVR coupled inductors, which directly affects the performance and reliability of TLVR coupled inductors. Utility Model Content

[0004] The purpose of this invention is to provide a TLVR coupled inductor and a power module. The TLVR coupled inductor has good heat dissipation, ensuring its performance and reliability.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A TLVR coupled inductor includes a magnetic core, a primary coil, and a secondary coil. The magnetic core encloses a portion of the primary coil and a portion of the secondary coil. A first terminal pin at the end of a first pin of the primary coil and a second terminal pin at the end of a second pin of the secondary coil are both exposed from a first side of the magnetic core along a first direction. The primary coil also includes a first body, to which both first pins are connected. The first body is exposed from a second side of the magnetic core along the first direction. The first side and the second side are opposite sides of the magnetic core along the first direction.

[0007] In some possible implementations, the area of ​​the first body exposed on the magnetic core is greater than or equal to 1 square millimeter.

[0008] In some possible implementations, the side of the first body exposed on the magnetic core is called the first side, and the side of the magnetic core used to expose the second side of the first body is called the second side, and the coplanarity of the first side and the second side is less than or equal to 0.1 mm.

[0009] In some possible implementations, the two first pins are connected to both ends of the first body along a second direction. The first body includes an extension disposed along a third direction, such that the width of the first body along the third direction is greater than the width of the first pins along the third direction. The first direction, the second direction, and the third direction are disposed at an angle to each other.

[0010] In some possible implementations, the width of the extension is greater than or equal to 0.2 mm.

[0011] In some possible implementations, the surface of the first body is provided with a first insulating layer, the end of the first body opposite to the first pin is a first side surface, the first side surface is not provided with the first insulating layer and is exposed to the magnetic core.

[0012] In some possible implementations, the first side is provided with an electroplated layer.

[0013] In some possible implementations, the surface of the first pin is provided with a second insulating layer, the end of the first pin away from the first body is the first terminal pin, the first terminal pin is not provided with the second insulating layer and is exposed to the magnetic core.

[0014] In some possible implementations, the side of the first body exposed on the magnetic core is called the first side, and the side of the magnetic core used to expose the second side of the first body is called the second side, and the area of ​​the first side accounts for 15%-40% of the area of ​​the second side.

[0015] In some possible implementations, the magnetic core, the primary coil, and the secondary coil are integrally formed.

[0016] A power module comprising a TLVR coupled inductor as described in any of the preceding claims.

[0017] The beneficial effects of this utility model are:

[0018] This utility model provides a TLVR coupled inductor and a power module. Both the first terminal pin and the second terminal pin are used for conductive connection, thereby connecting the TLVR coupled inductor to the circuit. After the circuit board is powered on, the energy generated by the TLVR coupled inductor during operation is dissipated through the first body exposed to the magnetic core. When the TLVR coupled inductor is operating, it does not affect the heat dissipation of the first body on the second side in the first direction, i.e., the side away from the circuit board. This achieves good heat dissipation of the TLVR coupled inductor, ensuring its performance and reliability, and consequently ensuring the performance and reliability of the power module using the TLVR coupled inductor. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the primary coil provided in a specific embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the assembly of the primary coil and the secondary coil provided in a specific embodiment of this utility model;

[0021] Figure 3 This is a schematic diagram of a TLVR coupled inductor from one perspective, provided by a specific embodiment of this utility model;

[0022] Figure 4 This is a schematic diagram of a TLVR coupled inductor from another perspective, provided by a specific embodiment of this utility model.

[0023] In the picture:

[0024] 100, Magnetic core; 110, Second side surface; 120, Third side surface; 200, Primary coil; 210, First pin; 211, First terminal pin; 212, First bend; 220, First body; 221, First side surface; 230, Extension; 300, Secondary coil; 310, Second pin; 311, Second terminal pin; 312, Second bend; 320, Second body. Detailed Implementation

[0025] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] like Figures 1-4 As shown, this embodiment provides a power module including a TLVR coupled inductor. This embodiment also provides a TLVR coupled inductor including a magnetic core 100, a primary coil 200, and a secondary coil 300. The magnetic core 100 encloses a portion of the primary coil 200 and a portion of the secondary coil 300. The first terminal pin 211 at the end of the first pin 210 of the primary coil 200 and the second terminal pin 311 at the end of the second pin 310 of the secondary coil 300 are both exposed from a first side of the magnetic core 100 along a first direction. The primary coil 200 also includes a first body 220, with both first pins 210 connected to the first body 220. The first body 220 is exposed from a second side of the magnetic core 100 along a first direction. The first side and the second side are opposite sides of the magnetic core 100 along the first direction.

[0029] Both the first terminal pin 211 and the second terminal pin 311 are used to make conductive connections with structures such as circuit boards of power modules, thereby connecting the TLVR coupled inductor to the circuit. After the circuit board is powered on, the energy generated by the TLVR coupled inductor during operation is dissipated through the first body 220 exposed to the magnetic core 100. When multiple TLVR coupled inductors connected in parallel are densely arranged on the circuit board, it does not affect the heat dissipation of the first body 220 on the second side in the first direction, that is, the side away from the circuit board, thereby achieving good heat dissipation of the TLVR coupled inductor, ensuring its performance and reliability, and thus ensuring the performance and reliability of the power module using the TLVR coupled inductor.

[0030] The side of the first body 220 exposed to the magnetic core 100 is designated as the first side surface 221, and the side of the magnetic core 100 used to expose the first body 220 is designated as the second side surface 110. The coplanarity of the first side surface 221 and the second side surface 110 is less than or equal to 0.1 mm, meaning the deviation between the first side surface 221 and the second side surface 110 does not exceed 0.1 mm. Since the overall size of the primary coil 200 is constant, if the deviation between the first side surface 221 and the second side surface 110 is too large, it means that the size deviation of the first pin 210 exposed to the magnetic core 100 is too large, thus affecting the conductive connection of the first pin 210, impacting electrical connection performance, and leading to problems such as unstable electrical connection. By constraining the flatness of the first side surface 221 and the second side surface 110, the deviation between the first pin 210 and the magnetic core 100 is indirectly limited, ensuring electrical connection performance.

[0031] The area of ​​the first body 220 exposed to the magnetic core 100, i.e., the area of ​​the first side surface 221, is greater than or equal to 1 square millimeter. Exemplarily, the area of ​​the first body 220 exposed to the magnetic core 100 can be 1 square millimeter, 2 square millimeters, 3 square millimeters, 4 square millimeters, or 5 square millimeters, etc., without limitation. Increasing the area of ​​the first body 220 exposed to the magnetic core 100, i.e., the area of ​​the first side surface 221, improves heat dissipation. However, if the area of ​​the first side surface 221 is too large, it will affect the inductance of the component. In some embodiments, one side of the first body 220 is completely exposed to the magnetic core 100, i.e., the first side surface 221 is the entire side of the first body 220 facing away from the first pin 210. In other embodiments, one side of the first body 220 can be partially exposed to the magnetic core 100, i.e., the first side surface 221 is a portion of the side of the first body 220 facing away from the first pin 210, as long as the exposed area is greater than or equal to 1 square millimeter.

[0032] The area of ​​the first side 221 accounts for 15%-40% of the area of ​​the second side 110. The large exposed area allows for better heat dissipation, but if the exposed area is too large, it will affect the inductance of the components.

[0033] The first body 220 includes an extension 230 disposed along a third direction, such that the width of the first body 220 along the third direction is greater than the width of the first pin 210 along the third direction. By providing the extension 230, the DC resistance (DCR) of the winding is reduced, and the Joule heat generated by the DC resistance of the winding is reduced when a large current passes through. Furthermore, when the side of the first body 220 is completely exposed, that is, by increasing the area of ​​the end face of the first body 220, the exposed area is increased, thereby improving the heat dissipation effect.

[0034] Optionally, the extension 230 can be located on one or both sides of the first body 220, and its shape can be any regular shape such as circular, rectangular, or elliptical, or it can be any irregular shape, without limitation. For example, the extension 230 is rectangular, located on one side of the first body 220, and its length along the second direction is the same as the length of the first body 220. Optionally, the width of the extension 230 is H, where H is greater than or equal to 0.2 mm. For example, the width H of the extension 230 is 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm, etc., set according to requirements, to avoid the extension 230 being too narrow to achieve heat dissipation, and also to avoid the width being too large to cause the entire TLVR coupled inductor to be too large.

[0035] In three-dimensional space, the first direction, the second direction, and the third direction are set at angles to each other. An example is given by taking the first direction, the second direction, and the third direction as being perpendicular to each other.

[0036] In some possible implementations, the magnetic core 100 is cuboid in shape, with a second side 110 (the second side of the magnetic core 100) and a third side 120 (the first side of the magnetic core 100) on both sides along the first direction. The first pin 210 and the second pin 310 are both exposed on the third side 120, that is, the first side of the magnetic core 100 is the third side 120. In the primary coil 200, two first pins 210 are connected to the two ends of the first body 220 along the second direction. The first pins 210 also include a first bend 212. The two first pins 210 and the first body 220 form a gate shape. The first bends 212 of the two first pins 210 are bent in opposite directions to each other, forming a U-shape. The secondary coil 300 also includes a second body 320, with two second pins 310 connected to both ends of the second body 320 along a second direction. The second body 320 and the two second pins 310 form a gate shape. Each second pin 310 also includes a second bend 312, which is bent toward each other. Optionally, both the primary coil 200 and the secondary coil 300 are integrally formed.

[0037] The first terminal pin 211 is disposed at the end of the first bent portion 212, and the second terminal pin 311 is disposed at the end of the second bent portion 312. By providing the first bent portion 212 and the second bent portion 312, the surface area of ​​the first terminal pin 211 and the second terminal pin 311 is increased, thereby increasing the surface area for conductive connection and increasing the flux density. Both the first terminal pin 211 and the second terminal pin 311 are coplanar with the third side surface 120. The entire end face of the first body 220 is the first side surface 221, which is completely exposed to the magnetic core 100, resulting in a simple structure and ease of manufacturing.

[0038] In some embodiments, the surface of the first body 220 is provided with a first insulating layer, and the surface of the first pin 210 is provided with a second insulating layer. By providing an insulating layer on the surface of the primary coil 200, sufficient isolation from the secondary coil 300 is achieved. The end of the first body 220 opposite to the first pin 210 is a first side surface 221, which is not provided with the first insulating layer and is exposed to the magnetic core 100. The end of the first pin 210 opposite to the first body 220 is a first terminal pin 211, which is not provided with the second insulating layer and is exposed to the magnetic core 100.

[0039] In some possible implementations, the first terminal pin 211, obtained by laser stripping the paint from the end of the first pin 210 away from the first body 220, is exposed on the magnetic core 100, that is, the first terminal pin 211 is exposed on the third side 120. By performing laser stripping on the end of the first body 220, the first terminal pin 211 can be used for conductive connection.

[0040] The first side surface 221 of the first body 220, which is opposite to the first pin 210, is exposed to the magnetic core 100 after laser stripping. That is, the first side surface 221 is exposed to the second side surface 110, and the second side of the magnetic core 100 is the second side surface 110. Laser stripping of the first pin 210 improves heat dissipation. In some embodiments, the first side surface 221 is provided with an electroplated layer, thereby protecting the exposed first side surface 221.

[0041] The secondary coil 300 is embedded within the primary coil 200. The first body 220 and the second body 320 are parallel, as are the first pin 210 and the second pin 310. Both the first bent portion 212 and the second bent portion 312 face towards the third side 120 in the first direction. The magnetic core 100, the primary coil 200, and the secondary coil 300 are formed into an integral structure through a hot-pressing process, exposing the first pin 210, the second pin 310, and the first body 220 to the magnetic core 100. Furthermore, the first side 221 is coplanar with the second side 110, and both the first terminal pin 211 and the second terminal pin 311 are coplanar with the third side 120. During the hot-pressing process, the first pin 210 and the second pin 310 can be directly exposed, simplifying the processing steps and facilitating molding.

[0042] In some embodiments, the method for fabricating a TLVR coupled inductor includes the following steps:

[0043] Step 1: Form a uniform insulating layer on the surface of the primary coil 200, comprising a first insulating layer and a second insulating layer. Optionally, the first and second insulating layers are polyimide film layers or other polymer resin material layers. Optionally, both the first and second insulating layers are formed by an encapsulation process.

[0044] Step 2: The secondary coil 300 and the primary coil 200 are nested, with the secondary coil 300 nested inside the primary coil 200, such that the first body 220 and the second body 320 are parallel, the first pin 210 and the second pin 310 are parallel, and a hot pressing process is performed.

[0045] Step 3: The first terminal pin 211, obtained by laser stripping the paint from the end of the first pin 210 away from the first body 220, is exposed on the magnetic core 100, that is, the first terminal pin 211 is exposed on the third side 120. The first side 221, obtained by laser stripping the paint from the end of the first body 220 away from the first pin 210, is exposed on the magnetic core 100, that is, the first side 221 is exposed on the second side 110. The second terminal pin 311, obtained by laser stripping the paint from the end of the second pin 310 away from the second body 320, is also exposed on the third side 120 of the magnetic core 100.

[0046] Step 4: Electroplating is performed on the first side 221, the first terminal PIN 211 and the second terminal PIN 311 to form an electroplated layer, or a thin film coating is formed by PVD (Physical Vapor Deposition) process.

[0047] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A TLVR coupled inductor, characterized in that, The device includes a magnetic core (100), a primary coil (200), and a secondary coil (300). The magnetic core (100) encloses a portion of the primary coil (200) and a portion of the secondary coil (300). The first terminal pin (211) at the end of the first pin (210) of the primary coil (200) and the second terminal pin (311) at the end of the second pin (310) of the secondary coil (300) are both exposed from a first side of the magnetic core (100) along a first direction. The primary coil (200) also includes a first body (220). Both of the first pins (210) are connected to the first body (220). The first body (220) is exposed from a second side of the magnetic core (100) along the first direction. The first side and the second side are two opposite sides of the magnetic core (100) along the first direction.

2. The TLVR coupled inductor according to claim 1, characterized in that, The area of ​​the first body (220) exposed on the magnetic core (100) is greater than or equal to 1 square millimeter.

3. The TLVR coupled inductor according to claim 1, characterized in that, The side of the first body (220) exposed on the magnetic core (100) is called the first side surface (221), and the side of the magnetic core (100) used to expose the second side of the first body (220) is called the second side surface (110). The coplanarity of the first side surface (221) and the second side surface (110) is less than or equal to 0.1 mm.

4. The TLVR coupled inductor according to claim 1, characterized in that, Two first pins (210) are connected to both ends of the first body (220) along the second direction. The first body (220) includes an extension (230) arranged along the third direction, such that the width of the first body (220) along the third direction is greater than the width of the first pin (210) along the third direction. The first direction, the second direction and the third direction are arranged at an angle to each other.

5. The TLVR coupled inductor according to claim 4, characterized in that, The width of the extension (230) is greater than or equal to 0.2 mm.

6. The TLVR coupled inductor according to claim 1, characterized in that, The surface of the first body (220) is provided with a first insulating layer. The end of the first body (220) away from the first pin (210) is a first side surface (221). The first side surface (221) is not provided with the first insulating layer and is exposed to the magnetic core (100).

7. The TLVR coupled inductor according to claim 6, characterized in that, The first side (221) is provided with an electroplated layer.

8. The TLVR coupled inductor according to claim 1, characterized in that, The surface of the first pin (210) is provided with a second insulating layer. The end of the first pin (210) away from the first body (220) is the first terminal PIN (211). The first terminal PIN (211) is not provided with the second insulating layer and is exposed to the magnetic core (100).

9. The TLVR coupled inductor according to claim 1, characterized in that, The side of the first body (220) exposed on the side of the magnetic core (100) is called the first side (221), and the side of the magnetic core (100) used to expose the second side of the first body (220) is called the second side (110). The area of ​​the first side (221) accounts for 15%-40% of the area of ​​the second side (110).

10. The TLVR coupled inductor according to any one of claims 1-9, characterized in that, The magnetic core (100), the primary coil (200), and the secondary coil (300) are integrally formed.

11. A power supply module, characterized in that, Includes the TLVR coupled inductor as described in any one of claims 1-10.

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