TW202032312A - Package structure of power module - Google Patents

Abstract

A package structure of power module is provided. The package structure includes a body having a sidewall, a first protruding structure protruding outward from an end of the sidewall of the body, a second protruding structure protruding outward from another end of the sidewall of the body and opposite to the first protruding structure, and a spring having two ends respectively embedded in the first and second protruding structures. The stress is transferred to the first and second protruding structures via the spring. The equivalent stiffness of the spring is different from that of the body such that the package structure as a whole suffers the stress homogeneously.

Description

Power module package structure

The present invention relates to a packaging structure, in particular to a power module packaging structure that has a good stress transmission effect during locking.

Excessive heat generated during the operation of the current Integrated Power Module (IPM) needs to be secured to the heat sink to assist in heat dissipation, and a thermal paste is filled between the module and the heat sink to improve heat dissipation efficiency.

When the elastic modulus of the body material is too large, or when there is a small tolerance in the manufacturing process, excessive stress is likely to be generated due to the amplification effect, which may cause damage to the module itself or built-in parts. On the contrary, when the elastic modulus of the main body material is too small, the main body is easily deformed, and the heat dissipation paste cannot contact the large deformed area, resulting in poor heat dissipation, and reliability problems under conditions of environmental vibration and external force impact.

Therefore, it is expected to develop a power module package structure that has a good stress transmission effect during locking.

According to an embodiment of the present invention, a power module packaging structure is provided. The power module packaging structure includes: a body with a side wall; a first protruding structure protruding outward from one end of the side wall of the body; a second protruding structure from the other end of the side wall of the body Protruding outwards and arranged opposite to the first protruding structure; and an elastic piece, both ends of which are respectively embedded in the first protruding structure and the second protruding structure, and transferring stress to the first protruding structure and the first protruding structure through the elastic piece Two protruding structures, wherein the equivalent rigidity of the elastic sheet is different from the equivalent rigidity of the main body, so that the overall force of the packaging structure is uniform.

In some embodiments, the body, the first protruding structure, and the second protruding structure are made of plastic. In some embodiments, the thickness of the side wall of the body is between 2 mm and 5 mm. In some embodiments, it further includes a substrate disposed at the bottom of the main body. In some embodiments, the shrapnel is made of metal. In some embodiments, the thickness of the elastic sheet is between 0.3 mm and 0.8 mm. In some embodiments, the elastic sheet further includes a locking portion, which cooperates with an external locking member to fix the packaging structure. In some embodiments, the elastic sheet further includes at least one bent portion. In some embodiments, part of the material of the elastic sheet is bent toward the side wall of the body to form the bent portion. In some embodiments, the bent portion of the elastic sheet partially overlaps the locking portion. In some embodiments, the elastic sheet includes two openings, which are symmetrically arranged on both sides of the locking portion. In some embodiments, the elastic sheet further includes a plurality of openings. In some embodiments, there is a gap between the elastic sheet and the side wall of the body. In some embodiments, the side wall of the body further includes a hole formed inward.

The present invention uses plastic as the body material of the power module package structure, and increases the thickness of the body to increase its equivalent stiffness. In the locking area of the packaging structure, a metal spring sheet is used to replace the traditional plastic locking element, and the thickness of the metal spring sheet is reduced to reduce its equivalent rigidity (the equivalent rigidity of the traditional plastic structure is equivalent to the metal spring sheet of the present invention About 18 times the rigidity). The present invention uses different materials for different components (body and locking components) to form equivalent rigidity differences between different components, so that the overall force of the package structure is more uniform, deformation is reduced, and the assembly is effectively reduced. Components due to dimensional tolerances. In the present invention, openings of various shapes are added to the metal elastic sheet of the locking area, which can finely adjust the overall stress value and the force distribution between the main body and the heat sink. The present invention forms a three-dimensional structure by bending a part of the metal shrapnel, which can increase the overall rigidity and area moment of inertia of the shrapnel, which is quite conducive to stress transmission. In the present invention, the size of related components is adjusted to improve the stress transmission and the fixed support under vibration and impact. In addition, the present invention is provided with a slot between the locking area and the main body, so that the locking accessory located in the locking area as a fixed structure will not contact the main body, and the stress generated by the locking is transferred to the side of the main body to avoid The stress is directly transferred to the Direct Bonded Copper (DBC) substrate attached to the body, causing the stress to be too concentrated, and the direct copper substrate can be increased. This can increase the stress transfer area and make the stress more uniform.

Please refer to FIGS. 1 and 2, according to an embodiment of the present invention, a power module package structure 10 is provided. FIG. 1 is a top view of the power module package structure 10. FIG. 2 is a perspective view of the power module package structure 10.

As shown in Figures 1 and 2, the power module package structure 10 includes a body 12, a substrate 14, a first protruding structure 16, a second protruding structure 18, a third protruding structure 20, a fourth protruding structure 22, and a first elastic sheet 24 , And second shrapnel 26. The body 12 includes a first side wall 28a, a second side wall 28b, a third side wall 28c, and a fourth side wall 28d. The first side wall 28 a, the second side wall 28 b, the third side wall 28 c, and the fourth side wall 28 d surround the main body 12 and roughly define the outer range and inner space of the main body 12. The first side wall 28a is connected to the second side wall 28b and the fourth side wall 28d, respectively, the third side wall 28c is connected to the second side wall 28b and the fourth side wall 28d, and the first side wall 28a and the third side wall 28c are opposite to each other. The second side wall 28b is opposite to the fourth side wall 28d. The substrate 14 is disposed on the bottom 12' of the main body 12 and is adjacent to the aforementioned multiple side walls. The first protruding structure 16 protrudes outward from the first end 28a1 of the first side wall 28a of the body 12. The second protruding structure 18 protrudes outward from the second end 28 a 2 of the first side wall 28 a of the body 12 and is disposed opposite to the first protruding structure 16. The third protruding structure 20 protrudes outward from the first end 28c1 of the third side wall 28c of the main body 12. The fourth protruding structure 22 protrudes outward from the second end 28c2 of the third side wall 28c of the main body 12 and is disposed opposite to the third protruding structure 20. The first elastic piece 24 includes a locking portion 24a. The first elastic piece 24 is substantially a long structure, and two ends 24 b of the first elastic piece 24 are respectively embedded in the first protruding structure 16 and the second protruding structure 18. In the present invention, the locking portion 24a of the first elastic piece 24 is matched with an external locking member (not shown) provided to fix the packaging structure 10, and the stress is transferred to the first protruding structure 16 and the first protruding structure 16 through the first elastic piece 24 The second protrusion structure 18. It is worth noting that the design consideration of the present invention is to make the equivalent rigidity of the first elastic piece 24 different from the equivalent rigidity of the body 12. The second elastic piece 26 includes a locking portion 26a. The second elastic piece 26 is substantially a long structure, and two ends 26 b of the second elastic piece 26 are respectively embedded in the third protruding structure 20 and the fourth protruding structure 22. In the present invention, the locking portion 26 a of the second elastic piece 26 is matched with a locking member (not shown) to fix the packaging structure 10, and the stress is transferred to the third protrusion structure 20 and the fourth protrusion structure 22 through the second elastic piece 26. It should be noted that the design consideration of the present invention is to make the equivalent rigidity of the second elastic piece 26 different from the equivalent rigidity of the body 12. In some embodiments, the first elastic piece 24 and the second elastic piece 26 have the same equivalent rigidity.

In some embodiments, the body 12, the first protruding structure 16, the second protruding structure 18, the third protruding structure 20, and the fourth protruding structure 22 may be composed of various plastic materials, including but not limited to, for example, polystyrene Thermoplastic resins such as polyphenylene sulfide (PPS) or polyethylene terephthalate (PET), and other types of plastics are also suitable for the present invention. In some embodiments, the thickness T of the first side wall 28a, the second side wall 28b, the third side wall 28c, and the fourth side wall 28d of the body 12 is approximately 2 mm to 5 mm.

In some embodiments, the substrate 14 may include various types of circuit boards to carry or insert various electronic components, including but not limited to, for example, a printed circuit board (PCB). Other types of circuit boards are also applicable to the present invention.

In some embodiments, the first elastic piece 24 may be made of various metal materials, including but not limited to, for example, stainless steel or manganese steel. Other types of metal materials are also applicable to the present invention. In some embodiments, the Young's modulus of the first elastic piece 24 is approximately between 180Mpa and 220Mpa. In some embodiments, the thickness t of the first elastic piece 24 is approximately 0.3 to 0.8 mm. In some embodiments, the equivalent rigidity of the first elastic piece 24 is approximately 0.01 N/mm to 0.08 N/mm. In some embodiments, the first elastic piece 24 further includes a bent portion 24c. In some embodiments, the bent portion 24c of the first elastic piece 24 partially overlaps with the locking portion 24a. In some embodiments, part of the material of the first elastic piece 24 is bent inward (toward the first side wall 28a of the main body 12) to form the bent portion 24c. In some embodiments, depending on product requirements, the first elastic sheet 24 may include a single or multiple bending portions 24c, so that a double-layer structure or a multi-layer structure is formed around the bending portion 24c, which has a structural strengthening effect. In some embodiments, the first elastic piece 24 further includes a plurality of openings 30 formed and distributed therein. In some embodiments, it is taken as an example that the first elastic piece 24 includes two openings 30, wherein the two openings 30 have the same shape, are located on both sides of the locking portion 24a and are arranged symmetrically, and do not overlap the bending portion 24c. However, the present invention is not limited to this. In some embodiments, the opening 30 of the first elastic piece 24 may include various shapes, including but not limited to, for example, a rounded rectangle, a circle, an ellipse, or a polygon. Other shapes are also applicable to the present invention. Here, a rounded rectangular opening 30 is taken as an example for description. In some embodiments, the length L of the rounded rectangular opening 30 is approximately 6 mm to 8 mm. In some embodiments, the width W of the rounded rectangular opening 30 is approximately 1.2 to 1.6 mm. In some embodiments, the round corner radius R of the rounded rectangular opening 30 is approximately 0.5 to 0.7 mm.

In some embodiments, the locking portion 24 a of the first elastic piece 24 is matched with an external locking member (not shown in the figure) provided to pass through to lock and fix the locking hole 32 of the packaging structure 10. The lock hole 32 is located in the central area of the lock portion 24a and is opened on the edge of the lock portion 24a (that is, a part of the lock hole 32 is not surrounded by the lock portion 24a). In some embodiments, the locking element may include various types of locking elements, including but not limited to, for example, screws, rivets, or elastic parts with threads. Other types of locking elements are also applicable to the present invention. In some embodiments, the locking portion 24a further includes a metal sheet 34 inserted therein, as shown in FIG. 2. In some embodiments, the metal sheet 34 may be made of various metal materials, including but not limited to, for example, stainless steel or manganese steel. Other types of metal materials are also applicable to the present invention. In some embodiments, the metal sheet 34 and the first elastic sheet 24 are made of the same material. In some embodiments, the two ends 24b of the first elastic piece 24 are respectively embedded in the first protruding structure 16 and the second protruding structure 18 in a manner of extending upward bending, as shown in FIG. 2.

In some embodiments, the second elastic piece 26 may be made of various metal materials, including but not limited to, for example, stainless steel or manganese steel. Other types of metal materials may also be suitable for the present invention. In some embodiments, the Young's modulus of the second elastic piece 26 is approximately between 180Mpa and 220Mpa. In some embodiments, the thickness of the second elastic piece 26 is approximately 0.3 mm to 0.8 mm, which is approximately the same as the thickness t of the first elastic piece 24. In some embodiments, the equivalent rigidity of the second elastic piece 26 is approximately 0.01 N/mm to 0.08 N/mm. In some embodiments, the second elastic piece 26 further includes a bent portion 26c. In some embodiments, the bent portion 26c of the second elastic piece 26 partially overlaps with the locking portion 26a. In some embodiments, part of the material of the second elastic piece 26 is bent inward (toward the third side wall 28c of the main body 12) to form the bent portion 26c. In some embodiments, depending on product requirements, the second elastic sheet 26 may include a single or multiple bending portions 26c, so that a double-layer structure or a multi-layer structure is formed around the bending portion 26c, which has a structural strengthening effect. In some embodiments, the second elastic piece 26 further includes a plurality of openings 36 formed and distributed therein. In some embodiments, it is taken as an example that the second elastic piece 26 includes two openings 36, wherein the two openings 36 have the same shape, are located on both sides of the locking portion 26a and are arranged symmetrically, and do not overlap the bending portion 26c. However, the present invention is not limited to this. In some embodiments, the opening 36 of the second elastic piece 26 may include various shapes, including but not limited to, for example, a rounded rectangle, a circle, an ellipse, or a polygon. Other shapes are also applicable to the present invention. Here, the rounded rectangular opening 36 is taken as an example for description. In some embodiments, the length L'of the rounded rectangular opening 36 is approximately 6 mm to 8 mm. In some embodiments, the width W'of the rounded rectangular opening 36 is approximately 1.2 to 1.6 mm. In some embodiments, the round corner radius R'of the rounded rectangular opening 36 is approximately 0.5 mm to 0.7 mm.

In some embodiments, the locking portion 26 a of the second elastic piece 26 cooperates with an external locking member (not shown in the figure) provided to pass through to lock and fix the locking hole 38 of the packaging structure 10. The lock hole 38 is located in the central area of the lock portion 26a and is opened on the edge of the lock portion 26a (that is, a part of the lock hole 38 is not surrounded by the lock portion 26a). In some embodiments, the locking element may include various types of locking elements, including but not limited to, for example, screws, rivets, or elastic parts with threads. Other types of locking elements are also applicable to the present invention. In some embodiments, the locking portion 26a further includes a metal sheet (not shown in the figure) inserted into the metal sheet 34 as shown in FIG. 2. In some embodiments, the metal sheet can be made of various metal materials, including but not limited to, for example, stainless steel or manganese steel. Other types of metal materials are also suitable for the present invention. In some embodiments, the metal sheet and the second elastic sheet 26 are made of the same material. In some embodiments, the two ends 26b of the second elastic piece 26 are respectively bent and extended upwards (as shown in Figure 2, the two ends 24b of the first elastic piece 24 are respectively embedded in the first protruding structure 16 and the second protruding structure 18) is embedded in the third protruding structure 20 and the fourth protruding structure 22. In some embodiments, the opening 30 of the first elastic piece 24 and the opening 36 of the second elastic piece 26 can also have different shapes. For example, the opening 30 of the first elastic piece 24 is a rounded rectangle, and the opening of the second elastic piece 26 36 is circular, or the opening 30 of the first elastic piece 24 is circular, and the opening 36 of the second elastic piece 26 is a rectangle with rounded corners.

In some embodiments, the first side wall 28a of the body 12 further includes a hole 40 formed inwardly, so as to avoid the part passing through the locking portion 24a and the mating locking member (not shown), such as a screw head, from being too wide. Contact with the first side wall 28a of the main body 12 causes damage to the main body 1. In addition, the aforementioned recessed design of the hole 40 can reduce the overall assembly volume of the power module package structure 10. In some embodiments, there is a gap G1 between the first elastic piece 24 and the first side wall 28a of the body 12, which means that the first elastic piece 24 is only embedded in the first protruding structure 16 and the second protruding structure with its two ends 24b. 18, without contacting the first side wall 28a of the body 12. In some embodiments, there is a gap G2 between the second elastic piece 26 and the third side wall 28c of the body 12, which means that the second elastic piece 26 is only embedded in the third protruding structure 20 and the fourth protruding structure with its two ends 26b. 22, without contacting the third side wall 28c of the body 12.

Please refer to FIGS. 3 and 4, according to an embodiment of the present invention, a power module package structure 10 is provided. FIG. 3 is a top view of the power module package structure 10. FIG. 4 is a perspective view of the power module package structure 10.

As shown in Figures 3 and 4, the power module package structure 10 includes a body 12, a substrate 14, a first protruding structure 16, a second protruding structure 18, a third protruding structure 20, a fourth protruding structure 22, and a first elastic sheet 24 , And second shrapnel 26. The body 12 includes a first side wall 28a, a second side wall 28b, a third side wall 28c, and a fourth side wall 28d. The first side wall 28 a, the second side wall 28 b, the third side wall 28 c, and the fourth side wall 28 d surround the main body 12 and roughly define the outer range and inner space of the main body 12. The first side wall 28a is connected to the second side wall 28b and the fourth side wall 28d, respectively, the third side wall 28c is connected to the second side wall 28b and the fourth side wall 28d, and the first side wall 28a and the third side wall 28c are opposite to each other. The second side wall 28b is opposite to the fourth side wall 28d. The substrate 14 is disposed on the bottom 12' of the main body 12 and is adjacent to the aforementioned multiple side walls. The first protruding structure 16 protrudes outward from the first end 28a1 of the first side wall 28a of the body 12. The second protruding structure 18 protrudes outward from the second end 28 a 2 of the first side wall 28 a of the body 12 and is disposed opposite to the first protruding structure 16. The third protruding structure 20 protrudes outward from the first end 28c1 of the third side wall 28c of the main body 12. The fourth protruding structure 22 protrudes outward from the second end 28c2 of the third side wall 28c of the main body 12 and is disposed opposite to the third protruding structure 20.

The first elastic piece 24 includes a locking portion 24a. The first elastic piece 24 is substantially a long structure, and two ends 24 b of the first elastic piece 24 are respectively embedded in the first protruding structure 16 and the second protruding structure 18. In the present invention, the locking portion 24a of the first elastic piece 24 is matched with an external locking member (not shown) provided to fix the packaging structure 10, and the stress is transferred to the first protruding structure 16 and the first protruding structure 16 through the first elastic piece 24 The second protrusion structure 18. It is worth noting that the design consideration of the present invention is to make the equivalent rigidity of the first elastic piece 24 different from the equivalent rigidity of the body 12. The second elastic piece 26 includes a locking portion 26a. The second elastic piece 26 is substantially a long structure, and two ends 26 b of the second elastic piece 26 are respectively embedded in the third protruding structure 20 and the fourth protruding structure 22. In the present invention, the locking portion 26a of the second elastic piece 26 is matched with an external locking member (not shown) to fix the packaging structure 10, and the stress is transferred to the third protruding structure 20 and the third protruding structure 20 through the second elastic piece 26 The fourth protrusion structure 22. It should be noted that the design consideration of the present invention is to make the equivalent rigidity of the second elastic piece 26 different from the equivalent rigidity of the body 12. In some embodiments, the first elastic piece 24 and the second elastic piece 26 have the same equivalent rigidity.

In some embodiments, the body 12, the first protruding structure 16, the second protruding structure 18, the third protruding structure 20, and the fourth protruding structure 22 may be composed of various plastic materials, including but not limited to, for example, polystyrene Thermoplastic resins such as thioether or polyethylene terephthalate, and other types of plastics are also suitable for the present invention. In some embodiments, the thickness T of the first side wall 28a, the second side wall 28b, the third side wall 28c, and the fourth side wall 28d of the body 12 is approximately 2 mm to 5 mm.

In some embodiments, the substrate 14 may include various types of circuit boards to carry or insert various electronic components, including but not limited to, for example, a printed circuit board (PCB). Other types of circuit boards are also applicable to the present invention.

In some embodiments, the first elastic piece 24 may be made of various metal materials, including but not limited to, for example, stainless steel or manganese steel. Other types of metal materials are also applicable to the present invention. In some embodiments, the Young's modulus of the first elastic piece 24 is approximately between 180Mpa and 220Mpa. In some embodiments, the thickness t of the first elastic piece 24 is approximately 0.3 to 0.8 mm. In some embodiments, the equivalent rigidity of the first elastic piece 24 is approximately 0.01 N/mm to 0.08 N/mm. In some embodiments, the first elastic piece 24 further includes a bent portion 24c. In some embodiments, the bent portion 24c of the first elastic piece 24 partially overlaps with the locking portion 24a. In some embodiments, part of the material of the first elastic piece 24 is bent inward (toward the first side wall 28a of the main body 12) to form the bent portion 24c. In some embodiments, depending on product requirements, the first elastic sheet 24 may include a single or multiple bending portions 24c, so that a double-layer structure or a multi-layer structure is formed around the bending portion 24c, which has a structural strengthening effect.

In some embodiments, the first elastic piece 24 further includes a plurality of openings 30 formed and distributed therein. In some embodiments, the opening 30 of the first elastic piece 24 may include various shapes, including but not limited to, for example, a rounded rectangle, a circle, an ellipse, or a polygon. Other shapes are also applicable to the present invention. Here, the circular opening 30 is taken as an example for description. In some embodiments, the radius r of the circular opening 30 is approximately 1 mm to 1.5 mm. In some embodiments, the number of circular openings 30 is not limited, and is based on the principle of meeting product requirements. In some embodiments, the locking portion 24 a of the first elastic piece 24 is matched with an external locking member (not shown in the figure) provided to pass through to lock and fix the locking hole 32 of the packaging structure 10. The lock hole 32 is located in the central area of the lock portion 24a and is opened on the edge of the lock portion 24a (that is, a part of the lock hole 32 is not surrounded by the lock portion 24a).

In some embodiments, the locking element may include various types of locking elements, including but not limited to, for example, screws, rivets, or elastic parts with threads. Other types of locking elements are also applicable to the present invention. In some embodiments, the plurality of openings 30 located on both sides of the locking portion 24a in the first elastic piece 24 have the same shape with each other, and their position distribution is symmetrical. In some embodiments, the locking portion 24a further includes a metal sheet 34 inserted therein, as shown in FIG. 4. In some embodiments, the metal sheet 34 may be made of various metal materials, including but not limited to, for example, stainless steel or manganese steel. Other types of metal materials are also applicable to the present invention. In some embodiments, the metal sheet 34 and the first elastic sheet 24 are made of the same material. In some embodiments, the two ends 24b of the first elastic piece 24 are respectively embedded in the first protruding structure 16 and the second protruding structure 18 in a manner of bending upwards, as shown in FIG. 4.

In some embodiments, the second elastic piece 26 may be made of various metal materials, including but not limited to, for example, stainless steel or manganese steel. Other types of metal materials may also be suitable for the present invention. In some embodiments, the Young's modulus of the second elastic piece 26 is approximately between 180Mpa and 220Mpa. In some embodiments, the thickness of the second elastic piece 26 is approximately 0.3 mm to 0.8 mm, which is approximately the same as the thickness t of the first elastic piece 24. In some embodiments, the equivalent rigidity of the second elastic piece 26 is approximately 0.01 N/mm to 0.08 N/mm. In some embodiments, the second elastic piece 26 further includes a bent portion 26c. In some embodiments, the bent portion 26c of the second elastic piece 26 partially overlaps with the locking portion 26a. In some embodiments, part of the material of the second elastic piece 26 is bent inward (toward the third side wall 28c of the main body 12) to form the bent portion 26c. In some embodiments, depending on product requirements, the second elastic sheet 26 may include a single or multiple bending portions 26c, so that a double-layer structure or a multi-layer structure is formed around the bending portion 26c, which has a structural strengthening effect.

In some embodiments, the second elastic piece 26 further includes a plurality of openings 36 formed and distributed therein. In some embodiments, the opening 36 of the second elastic piece 26 may include various shapes, including but not limited to, for example, a rounded rectangle, a circle, an ellipse, or a polygon. Other shapes are also applicable to the present invention. Here, the circular opening 36 is taken as an example for description. In some embodiments, the radius r'of the circular opening 36 is approximately between 1 mm and 1.5 mm. In some embodiments, the number of circular openings 36 is not limited, and is based on the principle of meeting product requirements. In some embodiments, the locking portion 26 a of the second elastic piece 26 cooperates with an external locking member (not shown in the figure) provided to pass through to lock and fix the locking hole 38 of the packaging structure 10. The lock hole 38 is located in the central area of the lock portion 26a and is opened on the edge of the lock portion 26a (that is, a part of the lock hole 38 is not surrounded by the lock portion 26a).

In some embodiments, the locking element may include various types of locking elements, including but not limited to, for example, screws, rivets, or elastic parts with threads. Other types of locking elements are also applicable to the present invention. In some embodiments, the plurality of openings 36 located on both sides of the locking portion 26a in the second elastic piece 26 have the same shape with each other, and their position distribution is symmetrical. In some embodiments, the lock portion 26a further includes a metal piece (not shown) inserted into the metal piece 34 as shown in FIG. 4. In some embodiments, the metal sheet can be made of various metal materials, including but not limited to, for example, stainless steel or manganese steel. Other types of metal materials are also suitable for the present invention. In some embodiments, the metal sheet and the second elastic sheet 26 are made of the same material. In some embodiments, the two ends 26b of the second elastic piece 26 are respectively bent and extended upward (as shown in Figure 4, the two ends 24b of the first elastic piece 24 are respectively embedded in the first protruding structure 16 and the second protruding structure 18) is embedded in the third protruding structure 20 and the fourth protruding structure 22. In some embodiments, the opening 30 of the first elastic piece 24 and the opening 36 of the second elastic piece 26 may also have different shapes. For example, the opening 30 of the first elastic piece 24 is circular, and the opening 36 of the second elastic piece 26 is circular. It is a rounded rectangle, or the opening 30 of the first elastic piece 24 is a rounded rectangle, and the opening 36 of the second elastic piece 26 is circular.

In some embodiments, the first side wall 28a of the main body 12 further includes a hole 40 formed inwardly to avoid passing through the locking portion 24a and an external locking member (not shown) such as screws. The head is too wide and contacts the first side wall 28a of the main body 12 to damage the main body 12. In addition, the aforementioned recessed design of the hole 40 can reduce the overall assembly volume of the power module package structure 10. In some embodiments, there is a gap G1 between the first elastic piece 24 and the first side wall 28a of the body 12, which means that the first elastic piece 24 is only embedded in the first protruding structure 16 and the second protruding structure with its two ends 24b. 18, without contacting the first side wall 28a of the body 12. In some embodiments, there is a gap G2 between the second elastic piece 26 and the third side wall 28c of the body 12, which means that the second elastic piece 26 is only embedded in the third protruding structure 20 and the fourth protruding structure with its two ends 26b. 22, without contacting the third side wall 28c of the body 12.

Please refer to FIGS. 5 and 6, according to an embodiment of the present invention, an integrated power module (IPM) package structure 100 is provided. Figure 5 is an exploded view of the integrated power module (IPM) packaging structure 100. FIG. 6 is an assembly diagram of an integrated power module (IPM) package structure 100.

As shown in Figures 5 and 6, the integrated power module (IPM) packaging structure 100 includes a body 12 as shown in Figure 2, a first elastic piece 24 embedded in a first protruding structure 16 and a second protruding structure 18, and an embedded The second elastic pieces (not shown) of the third protruding structure 20 and the fourth protruding structure 22, the first substrate 120, the second substrate 140, the upper cover 160, and the heat sink 180. The first substrate 120 is disposed on the bottom 12' of the main body 12. The upper cover 160 is disposed on the upper part 12'' of the main body 12 and exposes some elements of the main body 12, such as the plug 42 and the post 44. The main body 12, the first substrate 120, and the upper cover 160 constitute the accommodating space 200. The second substrate 140 is disposed on the body 12 and located in the receiving space 200. The upper cover 160 includes a first coupling portion 162, a second coupling portion 164, a third coupling portion 166, and a fourth coupling portion 168, respectively corresponding to the first protruding structure 16, the second protruding structure 18, and the first protruding structure 18 protruding from the main body 12. The three protrusion structure 20 and the fourth protrusion structure 22. When the upper cover 160 is disposed on the upper part 12" of the body 12, the first coupling portion 162, the second coupling portion 164, the third coupling portion 166, and the fourth coupling portion 168 cover the two ends 24b and 24b of the first elastic piece 24, respectively. Both ends of the second shrapnel. An external locking member (not shown in the figure) is additionally provided to pass through the locking portion 24 a of the first elastic sheet 24 to fix the body 12 on the heat sink 180.

In some embodiments, the first substrate 120 and the second substrate 140 may include various types of circuit boards for carrying or inserting various electronic components, including but not limited to, for example, printed circuit boards (PCBs) and other types of circuit boards. It can also be applied to the present invention.

The invention uses plastic as the body material of the power module packaging structure, and increases the thickness of the body to increase its equivalent rigidity. In the locking area of the packaging structure, a metal spring sheet is used to replace the traditional plastic locking element, and the thickness of the metal spring sheet is reduced to reduce its equivalent rigidity (the equivalent rigidity of the traditional plastic structure is equivalent to the metal spring sheet of the present invention About 18 times the rigidity). The present invention uses different materials for different components (body and locking components) to form equivalent rigidity differences between different components, so that the overall force of the package structure is more uniform, deformation is reduced, and the assembly is effectively reduced. Components due to dimensional tolerances. In the present invention, openings of various shapes are added to the metal elastic sheet of the locking area, which can finely adjust the overall stress value and the force distribution between the main body and the heat sink. The present invention forms a three-dimensional structure by bending a part of the metal shrapnel, which can increase the overall rigidity and area moment of inertia of the shrapnel, which is quite conducive to stress transmission. In the present invention, the size of related components is adjusted to improve the stress transmission and the fixed support under vibration and impact. In addition, the present invention is provided with a slot between the locking area and the main body, so that the locking accessory located in the locking area as a fixed structure will not contact the main body, and the stress generated by the locking is transferred to the side of the main body to avoid The stress is directly transferred to the direct copper-clad substrate attached to the main body, causing the stress to be too concentrated and the direct copper-clad substrate can increase the stress transfer area and make the stress more uniform.

The features of the above-mentioned embodiments are beneficial to those skilled in the art to understand the present invention. Those skilled in the art should understand that the present invention can be used as a basis to design and change other processes and structures to achieve the same purpose and/or the same advantages of the above-mentioned embodiments. Those with ordinary knowledge in the art should also understand that these equivalent substitutions do not depart from the spirit and scope of the present invention, and can be changed, replaced, or changed without departing from the spirit and scope of the present invention.

10: Power module packaging structure 12: Body 12': Bottom of the body 12'': Upper part of the body 14: Substrate 16: First protrusion structure 18: Second protrusion structure 20: Third protrusion structure 22: Fourth protrusion structure 24: the first elastic piece 24a: the locking portion of the first elastic piece 24b: the two ends of the first elastic piece 24c: the bent portion of the first elastic piece 26: the second elastic piece 26a: the locking portion of the second elastic piece 26b: the second elastic piece Both ends 26c of the second elastic piece 28a: the first side wall of the main body 28a1: the first end point of the first side wall of the main body 28a2: the second end point of the first side wall of the main body 28b: the second side wall of the main body 28c: the third side wall of the main body 28c1: the first end of the third side wall of the main body 28c2: the second end of the third side wall of the main body 28d: the fourth side wall of the main body 30: the opening of the first elastic piece 32: the first The keyhole of the shrapnel 34: the metal plate 36: the opening of the second shrapnel 38: the keyhole of the second shrapnel 40: the slot 42: the pin 44: the column 100: the integrated power module packaging structure 120: the first substrate 140: the first Second substrate 160: upper cover 162: first coupling portion 164: second coupling portion 166: third coupling portion 168: fourth coupling portion 180: heat sink 200: receiving space G1: between the first elastic piece and the first side wall of the body G2: the gap between the second shrapnel and the third side wall of the body L: the length of the opening of the first shrapnel L': the length of the opening of the second shrapnel r: the radius of the opening of the first shrapnel r' : The radius of the opening of the second shrapnel R: the rounded radius of the opening of the first shrapnel R': the rounded radius of the opening of the second shrapnel t: the thickness of the first shrapnel T: the first side wall and the first side wall of the body The thickness of the second side wall, the third side wall and the fourth side wall W: the width of the opening of the first elastic piece W': the width of the opening of the second elastic piece

Figure 1 is a top view of a power module packaging structure according to an embodiment of the present invention; Figure 2 is a perspective view of a power module packaging structure according to an embodiment of the present invention; Figure 3 is a perspective view of a power module packaging structure according to an embodiment of the present invention Fig. 4 is a perspective view of a power module package structure according to an embodiment of the present invention; Fig. 5 is a perspective view of a power module package structure according to an embodiment of the present invention; An exploded view of the module packaging structure; FIG. 6 is a combined view of a power module packaging structure according to an embodiment of the present invention.

10: Power module packaging structure

12: body

12’: The bottom of the body

14: substrate

16: The first prominent structure

18: The second protruding structure

20: The third protruding structure

22: The fourth protruding structure

24: The first shrapnel

24a: The lock part of the first shrapnel

24b: Both ends of the first shrapnel

24c: The bent part of the first shrapnel

26: second shrapnel

26a: The lock part of the second shrapnel

26b: Both ends of the second shrapnel

26c: The bent part of the second shrapnel

28a: The first side wall of the body

28a1: the first end of the first side wall of the body

28a2: The second end of the first side wall of the body

28b: The second side wall of the body

28c: The third side wall of the body

28c1: the first end of the third side wall of the body

28c2: The second end of the third side wall of the body

28d: The fourth side wall of the body

30: The opening of the first shrapnel

32: The keyhole of the first shrapnel

36: The opening of the second shrapnel

38: The keyhole of the second shrapnel

40: Hole

G1: The gap between the first shrapnel and the first side wall of the body

G2: The gap between the second shrapnel and the third side wall of the body

L: The length of the opening of the first shrapnel

L’: The length of the opening of the second shrapnel

R: The fillet radius of the opening of the first shrapnel

R’: The rounded corner radius of the opening of the second shrapnel

W: The width of the opening of the first shrapnel

W’: The width of the opening of the second shrapnel

Claims (14)

A power module packaging structure includes: a body with a side wall; a first protruding structure protruding outward from one end of the side wall of the body; a second protruding structure from the other end of the side wall of the body The point protrudes outward and is arranged opposite to the first protruding structure; and an elastic piece, both ends of which are respectively embedded in the first protruding structure and the second protruding structure, and the stress is transferred to the first protruding structure and the second protruding structure through the elastic piece The second protruding structure, wherein the equivalent rigidity of the elastic sheet is different from the equivalent rigidity of the body, so that the overall force of the packaging structure is uniform. According to the power module packaging structure described in item 1 of the scope of patent application, the body, the first protruding structure and the second protruding structure are made of plastic. According to the power module packaging structure described in claim 1, wherein the thickness of the side wall of the body is between 2 mm and 5 mm. The power module packaging structure described in the first item of the scope of patent application further includes a substrate disposed at the bottom of the body. In the power module package structure described in item 1 of the scope of patent application, the elastic sheet is made of metal. According to the power module package structure described in item 5 of the scope of patent application, the thickness of the elastic sheet is between 0.3 mm and 0.8 mm. According to the power module packaging structure described in item 1 of the scope of patent application, the elastic sheet further includes a locking portion, which cooperates with an external locking member to fix the packaging structure. According to the power module packaging structure described in item 7 of the scope of patent application, the elastic sheet further includes at least one bending portion. According to the power module packaging structure described in claim 8, wherein part of the material of the elastic sheet is bent toward the side wall of the body to form the bent portion. According to the power module packaging structure described in item 8 of the scope of patent application, the bent portion of the elastic sheet partially overlaps the locking portion. For the power module packaging structure described in item 7 of the scope of patent application, the elastic sheet further includes two openings, which are respectively located on both sides of the lock portion and are symmetrically arranged. According to the power module packaging structure described in item 1 of the scope of patent application, the elastic sheet further includes a plurality of openings. According to the power module packaging structure described in claim 1, wherein there is a gap between the elastic sheet and the side wall of the body. According to the power module packaging structure described in claim 1, wherein the side wall of the body further includes a hole formed inward.

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