Small surface-mounted transformer

Abstract

The utility model provides a small surface-mounted transformer, and belongs to the technical field of transformers. The transformer comprises a square-barrel-shaped framework, a base, an iron chip set, an electric coil winding and square-barrel-shaped or U-shaped groove-shaped cooling fins. The base is arranged near the bottom of the inner side of the framework in a penetrating mode in the penetrating direction of the framework and attached to the bottom face of the inner side of the framework, and the front end and the rear end of the base are located outside the framework and provided with pins. The upper end of the iron chip group is connected with the top surface of the inner side of the framework; the electric coil winding is wound around the iron chip group and is connected with the pins; the cooling fins are located on the outer side of the framework, and at least the outer walls of the left side and the right side of the framework make contact with the side walls of the corresponding cooling fins. Due to the fact that the cooling fins are additionally arranged, the heat dissipation area is increased, heat can be dissipated more quickly, and the service life of the transformer is prolonged.

Description

Technical Field

[0001] The utility model relates to a transformer in a circuit, in particular to a small-sized mounted transformer. Background Art

[0002] Surface mount transformers (Surface Mount Transformers), also known as SMT transformers, are commonly used on circuit boards. Compared with traditional coil-wound transformers, surface mount transformers have smaller size and weight and can be easily integrated into the circuit board layout of compact power modules, communication equipment, computer equipment, audio equipment, and various electronic products.

[0003] However, due to the insufficient heat dissipation area of ​​the existing small-scale mounted transformers, the heat generated during the operation of the transformer cannot be quickly dissipated, which affects the working efficiency of the transformer and even causes the transformer to fail. Summary of the invention

[0004] In order to solve the problem that the heat generated by the existing small-sized mounted transformer cannot be quickly dissipated during operation due to insufficient heat dissipation area, which affects the working efficiency of the transformer and even causes the transformer to fail, a small-sized mounted transformer is provided. The utility model increases the heat dissipation area by adding a heat sink, so that the heat can be dissipated faster and the service life of the transformer can be extended.

[0005] The technical solution adopted by the utility model is:

[0006] A small-sized surface-mount transformer, comprising:

[0007] A square tube-shaped frame;

[0008] A base, which is arranged near the bottom of the inner side of the frame along the through direction of the frame and is in contact with the inner ground of the frame, and the front and rear ends of the base are located outside the frame and are provided with pins;

[0009] An iron core group, wherein the iron core group is arranged inside the frame, and an upper end of the iron core group is connected to the inner top surface of the frame;

[0010] An electric coil winding, the electric coil winding is wound around the iron core assembly and connected to the pins;

[0011] The heat sink is in a square tube or U-shaped groove shape, and the heat sink is located outside the frame, and at least the left and right outer walls of the frame are in contact with the corresponding side walls of the heat sink.

[0012] Furthermore, grooves are respectively provided on the left side, right side and bottom of the base; the widths of the grooves on the left side and right side of the base are respectively consistent with the widths of the left side and right side of the frame; the depth of the grooves at the bottom of the base is greater than the thickness of the bottom of the frame; the left and right sides and bottom of the frame can be respectively fitted into the grooves on the left side, right side and bottom of the base.

[0013] Furthermore, the inner side of the skeleton has two upper and lower cylindrical parts; the diameters of the upper and lower cylindrical parts of the skeleton are the same, and the axial centers coincide; a through hole is provided on the base for the lower cylindrical part on the inner side of the skeleton to pass through; the iron chip group is designed in a cap shape, with a cylindrical part and a circular ring plate part; the inner diameter of the cylindrical part of the iron chip group is larger than the diameter of the cylindrical part of the skeleton; the cylindrical part of the iron chip group is sleeved on the upper and lower cylindrical parts on the inner side of the skeleton; the electric coil winding is located outside the cylindrical part of the iron chip group.

[0014] Furthermore, the frame includes an upper frame and a lower frame.

[0015] Furthermore, the heat sink is in the shape of a U-shaped groove, comprising a first convex edge, a first side edge, an arc-shaped plate, a second side edge and a second convex edge connected in sequence; when the frame is inserted into the inner area of ​​the groove of the heat sink, the first side edge and the second side edge respectively abut against the left and right outer walls of the frame, the first convex edge and the second convex edge abut against the outer lower surface of the bottom of the frame, and the arc-shaped concave bottom of the arc-shaped plate abuts against the outer upper surface of the top of the frame.

[0016] Furthermore, the electric coil winding includes a primary coil and a secondary coil; the secondary coil is wound on the outer surface of the iron chip group; the primary coil is wound on the outer surface of the secondary coil; the primary coil and the secondary coil are respectively connected to the pins on the front and rear sides of the base.

[0017] Furthermore, a spacer is provided between the primary coil and the secondary coil.

[0018] Furthermore, resistors are connected in parallel at both ends of the primary coil.

[0019] Furthermore, silicone adhesive is coated between the contact surface between the base and the frame, the contact surface between the frame and the iron core assembly, and the contact surface between the frame and the heat sink.

[0020] The beneficial effects of the utility model are:

[0021] In order to solve the problem that the heat generated by the existing small-sized mounted transformer cannot be quickly dissipated during operation due to insufficient heat dissipation area, which affects the working efficiency of the transformer and even causes transformer failure, the utility model provides a small-sized mounted transformer, which is composed of a base, a frame, a heat sink, an iron chip group and an electric coil winding. Since the heat sink is added, the heat dissipation area is increased, so that the heat can be dissipated faster and the service life of the transformer is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0023] Fig. 2 is a schematic diagram of the utility model;

[0024] Fig. 3 is a bottom view of the utility model;

[0025] Fig. 4 is a cross-sectional view of the middle part of the utility model;

[0026] FIG5 is a structural diagram of the heat sink of the utility model.

[0027] Description of reference numerals:

[0028] 1. Pin; 2. Base; 3. Frame; 31. Upper frame; 32. Lower frame; 4. Heat sink; 41. Arc plate; 42. First side; 43. Second side; 44. First flange; 45. Second flange; 5. Chip assembly; 6. Coil assembly; 7. Resistor; 8. Primary coil; 9. Spacer; 10. Secondary coil. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0030] Those skilled in the art will appreciate that, unless expressly stated, the singular forms "one", "an" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present utility model refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be an intermediate element. In addition, the "connection" or "coupling" used here may include wireless connection or wireless coupling. The term "and / or" used here includes all or any unit and all combinations of one or more associated listed items.

[0031] Figures 1 to 5 show the overall structural schematic diagram of the utility model. As shown in Figure 1, a small-sized surface-mounted transformer includes a base 2, a skeleton 3 and an iron core group 5. Among them, the skeleton 3 is roughly in the shape of a square tube. The base 2 is arranged near the bottom of the inner side of the skeleton 3 along the through direction of the skeleton 3, and the front and rear ends are located outside the skeleton 3 and are provided with pins 1. The iron core group 5 is arranged on the inner side of the skeleton 3, and its upper end is connected to the inner top surface of the skeleton 3, specifically using silicone adhesive for bonding. The iron core group 5 is surrounded by an electric coil winding 6 composed of enameled wire and wound upward. The electric coil winding 6 is connected to the pin 1. In order to enable the transformer to dissipate heat faster when working, in this embodiment, a heat sink 4 is arranged on the outer surface of the skeleton 3. The heat sink 4 is roughly in the shape of a square tube or a U-shaped groove, and is made of a metal material with a high thermal conductivity (such as an aluminum alloy, copper, etc. known in the art). The skeleton 3 is located in the inner area of ​​the heat sink 4, and at least the left and right outer walls of the skeleton 3 are in contact with the corresponding side walls of the heat sink 4 to better transfer heat. Therefore, when the transformer inner coil winding 6 is working, the heat sink 4 increases the heat dissipation area, so that the heat can be dissipated faster.

[0032] In this embodiment, as shown in Figures 1 and 4, grooves are respectively provided on the left and right sides and the bottom of the base 2. The groove widths of the grooves on the left and right sides of the base 2 are respectively consistent with the widths of the left and right sides of the frame 3. The groove depth of the groove at the bottom of the base 2 is greater than the thickness of the bottom of the frame 3. Thus, the left and right sides and the bottom of the frame 3 can be respectively fitted into the grooves on the left and right sides and the bottom of the base 2 to prevent the base 2 and the frame 3 from moving, while making the overall structure of the transformer more compact.

[0033] In this embodiment, there are two upper and lower cylindrical parts on the inner side of the skeleton 3. The diameters of the upper and lower cylindrical parts of the skeleton 3 are roughly the same, the axial centers coincide, and there is a gap between the lower end of the upper cylindrical part and the upper end of the lower cylindrical part. At the same time, a through hole is provided on the base 2 for the lower cylindrical part on the inner side of the skeleton 3 to pass through. In addition, the iron chip group 5 is designed in a cap shape, that is, it has a cylindrical part and a circular ring plate part. The inner diameter of the cylindrical part of the iron chip group 5 is larger than the diameter of the cylindrical part of the skeleton 3, and its top end in the axial length direction is against the top surface of the inner side of the skeleton 3. The cylindrical part of the iron chip group 5 is sleeved on the upper and lower cylindrical parts on the inner side of the skeleton 3. The electric coil winding 6 is located outside the cylindrical part of the iron chip group 5. Due to the matching design of the upper and lower cylindrical parts on the inner side of the skeleton 3 and the iron chip group 5, the positioning of the iron chip group 5 and the electric coil winding 6 can be achieved to prevent position movement.

[0034] In this embodiment, in order to facilitate the installation of the iron core group 5 and the coil winding 6 inside the frame 2, the frame 3 is designed to be composed of an upper frame 31 and a lower frame 32, and the cross-sections of the upper frame 31 and the lower frame 32 are roughly in the shape of a "mountain". The openings of the upper frame 31 and the lower frame 32 are opposite. In this embodiment, the frame 3 is split into an upper frame 31 and a lower frame 32, which is conducive to the rapid assembly and disassembly of the transformer and improves the efficiency of later maintenance.

[0035] In this embodiment, the heat sink 4 is roughly in the shape of a U-shaped groove, with the opening facing upward. The heat sink 4 includes an arc-shaped plate 41, a first side 42, a second side 43, a first flange 44 and a second flange 45. The upper ends of the first side 42 and the second side 43 are respectively connected to the two ends of the arc-shaped plate 41. The first flange 44 and the second flange 45 are respectively connected to the lower ends of the first side 42 and the second side 43, and the first flange 44 and the second flange 45 face the inner area of ​​the groove of the heat sink 4. When the skeleton 3 is inserted into the inner area of ​​the groove of the heat sink 4, the left and right outer walls of the skeleton 3 are respectively against the first side 42 and the second side 43 of the corresponding heat sink 4, the first flange 44 and the second flange 45 are against the lower outer surface of the bottom of the skeleton 3, and the arc-shaped concave bottom of the arc-shaped plate 41 is against the upper outer surface of the top of the skeleton 3. In this embodiment, the heat sink 4 also acts as a clip-like role, so that the overall structure of the skeleton 3 is maintained.

[0036] In this embodiment, the electric coil winding 6 includes a primary coil 8 and a secondary coil 10, and Figure 4 shows a cross-sectional view of the middle part of the utility model. The secondary coil 10 is directly wound on the outer surface of the iron chip group 5, and a separator 9 is provided on the outer surface of the secondary coil 10, and the primary coil 8 is wound on the outer surface of the separator 9, that is, from the outside to the inside. The primary coil 8 and the secondary coil 10 are respectively connected to the pins 1 on the front and rear sides of the base 2. The separator 9 is made of insulating material and plays a role in preventing electromagnetic interference. Furthermore, resistors 7 are arranged in parallel at both ends of the primary coil 8, and the resistor 7 is used to limit the current to prevent excessive current from damaging the internal circuit and structure of the transformer.

[0037] In this embodiment, in order to improve the stability of the transformer structure and further improve the heat transfer effect, silicone glue is coated between the contact surface between the base 2 and the frame 3 and the contact surface between the frame 3 and the heat sink 4.

Claims

1. A small-sized surface-mount transformer, characterized in that: The transformer includes: a square cylindrical frame; a base, which is penetrated along the through direction of the frame near the inner bottom of the frame and fits with the inner bottom surface of the frame, and the front and rear ends are located on the outside of the frame and are provided with pins; an iron chip group, which is arranged on the inner side of the frame, and the upper end of which is connected to the inner top surface of the frame; an electric coil winding, which is wound on the iron chip group and connected to the pins; a square cylindrical or U-shaped groove-shaped heat sink, which is located on the outside of the frame, and at least the left and right outer walls of the frame are in contact with the corresponding side walls of the heat sink.

2. A small-sized surface-mount transformer according to claim 1, characterized in that: The left side, right side and bottom of the base are respectively provided with grooves; the width of the grooves on the left side and right side of the base is respectively consistent with the width of the left side and right side of the frame; the depth of the groove at the bottom of the base is greater than the thickness of the bottom of the frame; the left and right sides and the bottom of the frame can be respectively fitted into the grooves on the left side, right side and bottom of the base.

3. A small-sized surface-mount transformer according to any one of claims 1 or 2, characterized in that: The inner side of the skeleton has two upper and lower cylindrical parts; the diameters of the upper and lower cylindrical parts of the skeleton are the same, and the axial centers coincide with each other; a through hole is provided on the base for the lower cylindrical part on the inner side of the skeleton to pass through; the chip set is designed in a cap shape, with a cylindrical part and a circular ring plate part; the inner diameter of the cylindrical part of the chip set is larger than the diameter of the cylindrical part of the skeleton; the cylindrical part of the chip set is sleeved on the upper and lower cylindrical parts on the inner side of the skeleton; the electric coil winding is located outside the cylindrical part of the chip set.

4. A small-sized surface-mount transformer according to claim 3, characterized in that: The frame includes an upper frame and a lower frame.

5. A small-sized surface-mount transformer according to claim 1, characterized in that: The heat sink is in the shape of a U-shaped groove, and includes a first convex edge, a first side edge, an arc-shaped plate, a second side edge and a second convex edge connected in sequence; when the frame is inserted into the inner area of ​​the groove of the heat sink, the first side edge and the second side edge respectively abut against the left and right outer walls of the frame, the first convex edge and the second convex edge abut against the outer lower surface of the bottom of the frame, and the arc-shaped concave bottom of the arc-shaped plate abuts against the outer upper surface of the top of the frame.

6. A small-sized surface-mount transformer according to claim 1, characterized in that: The electric coil winding includes a primary coil and a secondary coil; the secondary coil is wound on the outer surface of the iron core group; the primary coil is wound on the outer surface of the secondary coil; the primary coil and the secondary coil are respectively connected to the pins on the front and rear sides of the base.

7. A small-sized surface-mount transformer according to claim 6, characterized in that: A spacer is arranged between the primary coil and the secondary coil.

8. A small-sized surface-mount transformer according to claim 6, characterized in that: Resistors are connected in parallel at both ends of the primary coil.

9. The small-sized surface-mount transformer according to claim 3, characterized in that: Silicone adhesive is coated between the contact surface between the base and the frame, the contact surface between the frame and the iron core assembly, and the contact surface between the frame and the heat sink.

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