Framework of transformer and transformer

Abstract

The framework of the transformer comprises a first base, a winding frame and a second base which are connected in the first direction, a boss is arranged at the end, away from the second base, of the first base, a first metal pin is arranged on the boss, and a second metal pin is arranged at the end, away from the first base, of the second base. The first base is provided with a groove extending in the second direction, the groove is located between the first metal pin and the second metal pin, and the first direction is perpendicular to the second direction. The utility model provides a framework of a transformer, which not only does not need to greatly increase the volume of the framework of the transformer, but also is beneficial to saving the production and material cost of the transformer, and can meet the design requirement of a safety distance between a primary circuit and a secondary circuit of a power supply. And the electric gap and the creepage distance between the primary side circuit and the secondary side circuit can be increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer technical field especially is related to a skeleton of transformer and transformer. BACKGROUND

[0002] In today's switching power supply products, for the switching power supply of opening plate type small size, in order to meet the design requirement of the safety distance between the primary circuit and the secondary circuit of the power supply, the electrical clearance and the creepage distance between the primary circuit and the secondary circuit and between the secondary circuit and the secondary circuit need to be increased, and the traditional method is to directly increase the interval distance between the conductive parts of the primary circuit and the secondary circuit and between the secondary circuit and the secondary circuit, which directly increases the overall size of the transformer skeleton.

[0003] In the existing switching power supply products, the small transformer used in the micro-power power module needs to increase the electrical clearance and the creepage distance between the primary circuit and the secondary circuit to meet the design requirement of the safety distance between the primary circuit and the secondary circuit, and the transformer skeleton can be changed to meet the safety distance requirement of the transformer. In the prior art, to increase the electrical clearance and the creepage distance between the primary circuit and the secondary circuit, the base of the transformer skeleton is usually widened or the transformer core is wrapped with adhesive paper, which greatly increases the volume of the transformer and the production and material costs. Therefore, a transformer skeleton is needed to meet the design requirement of the safety distance between the primary circuit and the secondary circuit and to help increase the electrical clearance and the creepage distance between the primary circuit and the secondary circuit. SUMMARY

[0004] Therefore, it is necessary to provide a transformer skeleton to meet the design requirement of the safety distance between the primary circuit and the secondary circuit and to help increase the electrical clearance and the creepage distance between the primary circuit and the secondary circuit.

[0005] The application provides a transformer skeleton, which comprises a first base, a bobbin and a second base connected along a first direction, wherein one end of the first base away from the second base is provided with a boss, the boss is provided with a first metal pin, one end of the second base away from the first base is provided with a second metal pin, the first base is provided with a groove extending along a second direction, the groove is located between the first metal pin and the second metal pin, and the first direction is perpendicular to the second direction.

[0006] The transformer frame provided by the application is characterized in that a boss is arranged at the end of the first base away from the second base, and a groove extending in the second direction is arranged on the first base, the groove being arranged between the first metal pin and the second metal pin. This design does not need to greatly increase the volume of the transformer frame, and is beneficial to saving the cost of transformer production and materials, and can meet the design requirements of the safety distance between the primary circuit and the secondary circuit of the power supply, and is helpful to increasing the electrical clearance and creepage distance between the primary circuit and the secondary circuit.

[0007] In one embodiment, a receiving cavity extending through the opposite sides of the first direction is formed in the bobbin, and the receiving cavity is used for accommodating a magnetic core.

[0008] In one embodiment, a concave wall is arranged on the first base, the concave wall being arranged on the side of the first base where the groove is arranged, and the concave wall being arranged between the boss and the groove, and the concave wall extending in the second direction.

[0009] In one embodiment, a notch is formed at the end edge of the concave wall away from the first base, and the notch faces the receiving cavity in the first direction; and a side wall is arranged on the first base, the side wall being connected with the concave wall and extending in the direction close to the second base.

[0010] In one embodiment, a first winding groove is arranged on the side of the first base away from the groove, and the first winding groove extends from the first metal pin to the bobbin in the first direction; and a second winding groove is arranged on the side of the second base away from the groove, and the second winding groove extends from the second metal pin to the bobbin in the opposite direction of the first direction.

[0011] In one embodiment, a first baffle and a second baffle are arranged on the bobbin in the first direction, and a winding space is formed between the first baffle and the second baffle.

[0012] In one embodiment, the first baffle and the second baffle are arranged on the side of the bobbin away from the first winding groove and the second winding groove.

[0013] In one embodiment, the edges of the first baffle and the second baffle away from the first base and the second base are smooth edges.

[0014] In one embodiment, the distance between the first baffle and the first metal pin is greater than the distance between the second baffle and the second metal pin.

[0015] A transformer comprises a magnetic core, a first wire, a second wire and the winding frame of the transformer, the magnetic core is arranged in the winding frame, the first wire is connected with the first metal pin and wound around the winding frame, and the second wire is connected with the second metal pin and wound around the winding frame. BRIEF DESCRIPTION OF DRAWINGS

[0016] The utility model will be further described below in combination with the drawings and embodiments, in which:

[0017] Figure 1 The structure schematic view of the winding frame of the transformer is provided for an embodiment of the utility model;

[0018] Figure 2 The structure schematic view of the winding frame of the transformer is provided for an embodiment of the utility model;

[0019] Figure 3 The structure schematic view of the winding frame of the transformer is provided for an embodiment of the utility model.

[0020] Fig. 1 is a structure schematic view of the winding frame of the transformer according to the utility model; DETAILED DESCRIPTION

[0021] In order to make the above object, features and advantages of the utility model more apparent, specific embodiments of the utility model will be described in detail below in combination with the drawings. In the following description, a lot of specific details are set forth in order to fully understand the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the following disclosed specific embodiments.

[0022] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0023] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood to indicate or imply relative importance or imply the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0024] In the utility model, unless otherwise specifically defined and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the communication or interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0025] In today's switching power supply products, for the switching power supply of open board type small size, in order to meet the design requirements of the safety distance between the primary circuit and the secondary circuit of the power supply, it is necessary to increase the electrical clearance and creepage distance between the primary circuit and the secondary circuit, and the electrical clearance and creepage distance between the secondary circuit and the secondary circuit. The traditional method is to directly increase the interval distance between the primary circuit and the secondary circuit conductive parts, and the interval distance between the secondary circuit and the secondary circuit, which directly increases the overall size of the transformer skeleton. In order to increase the electrical clearance and creepage distance of the conductive parts between the primary circuit and the secondary circuit, and the electrical clearance and creepage distance between the secondary circuit and the secondary circuit, the general method is to greatly increase the size of the first base or the second base, or to use the flying wire mode (using a longer three-layer insulating wire through the metal pin and the wire slot to be directly used as the wire of the secondary circuit), or to use the insulating tape to wrap the magnetic core, the winding and the skeleton assembly. Due to the great increase of the size of the first base and the second base, the structure of the circuit board cooperating with it needs to be changed, the use of flying wire insulating tape will bring certain cost, and additional processes are needed, such as welding wire, winding insulating tape, etc., which has a certain influence on the reliability of the product, and increases the production cost of the transformer; Even due to the uncontrollability of part of the process precision, it brings a certain production failure rate, which seriously affects the production benefit. At the same time, in order to prevent the primary and secondary wires from contacting each other, it is usually necessary to increase the retaining wall, sleeve, reverse folding paper, etc. at the wire collecting place, which needs manual operation, affects the automatic production of the transformer, and increases the additional process and cost.

[0026] In the existing switch power supply products, in order to meet the design requirements of the safety distance between the primary circuit and the secondary circuit of the power module, the electrical gap and the creepage distance between the primary circuit and the secondary circuit need to be increased, and the transformer skeleton can be changed to meet the safety distance requirements of the transformer. In the prior art, in order to increase the electrical gap and the creepage distance between the primary circuit and the secondary circuit, the base of the transformer skeleton is widened or the transformer core is wrapped with adhesive paper, which greatly increases the volume of the transformer and the production and material costs. Therefore, a transformer skeleton is needed, which can meet the design requirements of the safety distance between the primary circuit and the secondary circuit, and help to increase the electrical gap and the creepage distance between the primary circuit and the secondary circuit.

[0027] Reference Figures 1-3 To solve the above problems, the embodiment of the present application provides a transformer skeleton 10, which comprises a first base 20, a bobbin 30 and a second base 40 connected along a first direction P1, the end of the first base 20 away from the second base 40 is provided with a boss 21, the boss 21 is provided with a first metal pin 211, the end of the second base 40 away from the first base 20 is provided with a second metal pin 41, the first base 20 is provided with a groove 22 extending along a second direction P2, the groove 22 is located between the first metal pin 211 and the second metal pin 41, and the first direction P1 is perpendicular to the second direction P2.

[0028] Reference Figures 1-3 In the transformer skeleton 10, Figure 1 , Figure 2 and Figure 3A structural schematic diagram of a transformer skeleton 10 is provided for an embodiment of the present application. The transformer skeleton 10 includes a first base 20, a bobbin 30 and a second base 40 connected along a first direction P1, the first base 20 and the second base 40 can play a supporting role, the bobbin 30 is connected with the first base 20 and the second base 40, the transformer skeleton 10 is the main structural component of the transformer, also known as the transformer bobbin. It provides a winding space for copper wires in the transformer, fixes the magnetic core in the transformer, and provides a path for wire passing and conduction. The transformer skeleton 10 can provide a winding space for copper wires, the winding groove on the skeleton is used for winding copper wires, ensuring the stability and neatness of the coil, the bobbin 30 is the part of the transformer skeleton for fixing and guiding the winding of copper wires, the bobbin 30 provides a winding space for copper wires in the transformer, ensuring that the copper wires can be stably wound on the transformer skeleton 10. The through accommodating cavity 31 opposite to the two sides of the first direction P1 is formed in the bobbin 30, the accommodating cavity 31 is used for accommodating the magnetic core of the transformer, the skeleton fixes the magnetic core through the accommodating cavity 31, ensuring the stability of its position in the transformer, the shape of the accommodating cavity 31 can be determined according to the matching magnetic core, such as round hole, square hole, special-shaped hole. In some embodiments, the end of the first base 20 away from the second base 40 is provided with a boss 21, the boss 21 is provided with a first metal pin 211, the end of the second base 40 away from the first base 20 is provided with a second metal pin 41, the first metal pin 211 and the second metal pin 41 are some protrusions on the transformer skeleton, mainly used for connecting the coil and the external circuit, the first metal pin 211 and the second metal pin 41 play a crucial role in the manufacturing process of the transformer, which can ensure the reliability and performance of the transformer. For example, the first metal pin 211 and the second metal pin 41 are connected with the PCB (printed circuit board) by welding, playing a conductive role, ensuring that the current inside the transformer can be smoothly transmitted to the external circuit. Common types of pins include vertical and horizontal pins, straight and curved pins. Vertical and horizontal pins are mainly used for soldering circuit boards, straight pins are suitable for straight insertion electronic components, and curved pins are suitable for insertion electronic components. According to actual needs, metal pins of different materials can be used, such as pure copper pins with good conductivity, high strength and good corrosion resistance, but the price is relatively high, silver-plated pins have good conductivity and corrosion resistance, the price is relatively cheap, but the strength is slightly lower, gold-plated pins not only have good conductivity and corrosion resistance, but also have good ornamental properties, but the price is relatively high and easy to oxidize and fall off.In some embodiments, the first base 20 is provided with a groove 22 extending along a second direction P2, the groove 22 being located between the first metal pin 211 and the second metal pin 41, the first direction P1 being perpendicular to the second direction P2, the design of the groove 22 and the boss 21 not only does not need to greatly increase the volume of the transformer skeleton, but also is beneficial to save the production and material costs of the transformer, and at the same time can meet the design requirements of the safety distance between the primary side circuit and the secondary side circuit of the power supply, and is helpful to increase the electrical clearance and the creepage distance between the primary side circuit and the secondary side circuit.

[0029] Reference Figures 1-3The first base 20 is provided with a concave wall 23 located on one side of the first base 20 where the groove 22 is formed, and the concave wall 23 is located between the boss 21 and the groove 22. The concave wall 23 extends along the second direction P2. The combination of the concave wall 23 and the groove 22 can increase the electrical clearance and creepage distance between the primary side circuit and the secondary side circuit. In some embodiments, the first base 20 is provided with a side wall 25 connected to the concave wall 23 and extending in the direction close to the second base 40. For example, the left side of the first base 20 is provided with a side wall 25. By providing the connected concave wall 23 and side wall 25, a two-sided surrounding valley structure is formed, so that the primary side magnetic core can be separated from the first metal pin 211 embedding surface of the first base 20 and the conductive parts of the secondary side circuit by a certain creepage distance in the height direction of the two sides. The concave wall 23 and the side wall 25 have a certain thickness, which is arranged at the edge of the first base 20 and flush with the outer edge of the first base 20. The concave wall 23 is parallel to the first baffle 32, and the side wall 25 is perpendicular to the first baffle 32. In some embodiments, in order to facilitate automatic assembly of the magnetic core, the height of the concave wall 23 is 1.25 mm. In some embodiments, the end edge of the concave wall 23 away from the first base 20 forms a notch 231, and the notch 231 faces the accommodating cavity 31 along the first direction P1. The notch 231 can be rectangular, or can be a quadrilateral with smooth edges. The concave wall 23 provided with the notch 231 can effectively meet the safety design requirements and serve as a primary and secondary side foolproof mark. In order to cope with the situation where the conductive parts of the secondary side circuit exist on the lower side of the transformer, and to ensure that the electrical clearance and creepage distance between the conductive parts of the secondary side circuit and the conductive parts of the primary side circuit of the transformer are sufficient to meet the safety requirements, the height of the side wall 25 is equal to the height of the first baffle 32, and the side wall 25 also serves as a support for the lower side of the transformer. In some embodiments, the right side of the first base 20 is provided with a second groove penetrating the upper and lower surfaces of the first base 20. By providing the second groove, the electrical clearance and creepage distance between the conductive parts of the primary side circuit or the secondary side circuit of the transformer, and between the conductive parts of the primary side circuit or the secondary side circuit of the transformer and the conductive parts of the isolation circuit can be effectively increased. For the case of simultaneously increasing the electrical clearance and creepage distance between the conductive parts of the primary side circuit and the conductive parts of the secondary side circuit of the transformer, the second groove, the side wall 25 and the concave wall 23 can be provided on the upper surfaces of the first base 20 and the second base 40 at the same time. The number and position of the second groove, the side wall 25 and the concave wall 23 can also be changed according to actual application conditions.

[0030] Referring to Figure 1 and Figure 3The first base 20 has a first winding groove 24 on the side opposite to the groove 22. The first winding groove 24 extends from the first metal pin 211 along the first direction P1 to the winding frame 30. The first winding groove 24 can wind copper wire, providing space for winding copper wire in the transformer. Similarly, the second base 40 has a second winding groove 42 on the side opposite to the groove 22. The second winding groove 42 extends from the second metal pin 41 in the opposite direction of the first direction P1 to the winding frame 30. The second winding groove 42 can wind copper wire, providing space for winding copper wire in the transformer. To ensure the normal operation of the first winding groove 24 and the second winding groove 42, during the design and manufacturing process, the width of the first winding groove 24 and the second winding groove 42 can be as close to the upper limit as possible within the tolerance range. This can avoid the situation where the customer cannot wind the wire. At the same time, it is easier to change the size of the insert in this part from large to small in the mold, while the opposite is extremely poor. To prevent scratching the copper wire during customer winding, the edges of the first winding slot 24 and the second winding slot 42 should be rounded to increase strength and prevent the frame from breaking. To ensure the strength and durability of the transformer frame 10, the first winding slot 24 or the second winding slot 42 can be made on an insert. Specifically, the first base 20 can have multiple adjacent and parallel first winding slots 24, and the second base 40 can have multiple adjacent and parallel second winding slots 42. The slot walls of the first winding slots 24 and the second winding slots 42 can be set as plates with slopes. At the same time, the adjacent slot walls can be set with different thicknesses as needed to meet the safety requirements between outputs, reduce material and labor costs, improve reliability and consistency, and increase production efficiency. After the transformer is wound, the lead-out of the three-layer insulated wire is directly wound onto multiple spaced and parallel first metal pins 211 and second metal pins 41 and welded together. This eliminates the need for three-layer insulated wire lead-out flying wire processing, reducing process difficulty and enhancing welding reliability.

[0031] See Figure 1 and Figure 2The winding frame 30 is provided with a first baffle 32 and a second baffle 33 at a distance of P1 in the first direction, forming a winding space between the first baffle 32 and the second baffle 33. The two ends of the winding frame 30 extend outward to form the first baffle 32 and the second baffle 33. The distance between the first baffle 32 and the first metal pin 211 is greater than the distance between the second baffle 33 and the second metal pin 41. The edges of the first baffle 32 and the second baffle 33 on the side opposite to the first base 20 and the second base 40 are smooth edges. Grinding the tops of the first baffle 32 and the second baffle 33 flat can reduce the error prevention effect and prevent the magnetic core from getting stuck when installed, without the need for an outwardly extended platform, which can effectively improve the transformer production time cost and production efficiency. The main materials of the transformer frame include bakelite, nylon, and liquid crystal polymer. These materials possess excellent mechanical strength, insulation, heat resistance, and corrosion resistance, meeting the requirements of transformers in various operating environments. The first baffle 32 and the second baffle 33 can be made of bakelite, a commonly used material in transformer frames, possessing high mechanical strength, good insulation, heat resistance, and corrosion resistance. Bakelite is generally black, with a smooth surface, and is particularly resistant to high temperatures. Alternatively, the first baffle 32 and the second baffle 33 can also be made of nylon, a thermoplastic resin with high toughness, good ductility, and resistance to breakage. Nylon frames are typically white and transparent, with some water absorption and strong oil resistance, but they melt easily when heated and are prone to deformation during winding. Nylon frames can be used to manufacture low-frequency transformers with less stringent winding requirements or ordinary coil inductors. The first baffle 32 and the second baffle 33 can also be made of liquid crystal polymers, which possess excellent electrical and mechanical properties.

[0032] The transformer of the second aspect of this utility model includes a magnetic core, a first conductor, a second conductor, and a frame 10 of the transformer of the first aspect embodiment. The magnetic core is disposed in a winding frame 30. The first conductor is connected to a first metal pin 211 and wound around the winding frame 30. The second conductor is connected to a second metal pin 41 and wound around the winding frame 30. Since this embodiment adopts all the technical features of the frame 10 of the transformer of the first aspect embodiment, this embodiment has all the beneficial effects brought by the first aspect embodiment, which will not be repeated here.

[0033] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0034] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A transformer core, characterized by The transformer comprises a first base, a bobbin and a second base connected along a first direction, a boss is arranged at an end of the first base away from the second base, a first metal pin is arranged on the boss, a second metal pin is arranged at an end of the second base away from the first base, a groove is arranged on the first base along a second direction, and the groove is located between the first metal pin and the second metal pin, and the first direction is perpendicular to the second direction.

2. The transformer bobbin of claim 1, wherein, A receiving cavity is formed in the bobbin and penetrates two sides opposite to each other along the first direction, and the receiving cavity is used for accommodating a magnetic core.

3. The transformer bobbin of claim 2, wherein, A concave wall is arranged on the first base, the concave wall is located on a side of the first base where the groove is arranged, and the concave wall is located between the boss and the groove and extends along the second direction.

4. The transformer bobbin of claim 3, wherein, An edge of the concave wall away from the first base is formed with a notch, and the notch faces the receiving cavity along the first direction; and a side wall is arranged on the first base, the side wall is connected with the concave wall and extends in a direction close to the second base.

5. The transformer bobbin of claim 2, wherein, A first winding groove is arranged on a side of the first base away from the groove, and the first winding groove extends from the first metal pin to the bobbin along the first direction; and a second winding groove is arranged on a side of the second base away from the groove, and the second winding groove extends from the second metal pin to the bobbin along a reverse direction of the first direction.

6. The transformer bobbin of claim 5, wherein, First and second baffles are arranged on the bobbin along the first direction, and a winding space is formed between the first and second baffles.

7. The transformer bobbin of claim 6, wherein, The first and second baffles are located on a side of the bobbin away from the first and second winding grooves.

8. The transformer bobbin of claim 6, wherein, Edges of the first and second baffles away from the first and second bases are smooth edges.

9. The transformer bobbin of claim 6, wherein, A distance between the first baffle and the first metal pin is greater than a distance between the second baffle and the second metal pin.

10. A transformer, characterized by The transformer comprises a magnetic core, a first wire, a second wire and a skeleton as claimed in any one of claims 1 to 9, the magnetic core is arranged in the bobbin, the first wire is connected with the first metal pin and wound around the bobbin, and the second wire is connected with the second metal pin and wound around the bobbin.

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