Miniature transformer

Abstract

A miniature transformer comprises a first magnetic iron core, a second magnetic iron core and a plurality of flexible circuit boards, the first magnetic iron core and the second magnetic iron core are oppositely arranged, the flexible circuit boards are provided with coils, an installation groove is formed in the middle of the first magnetic iron core and / or the second magnetic iron core in a concave mode, and an installation cavity is formed between the first magnetic iron core and the second magnetic iron core. The first magnetic iron core and the second magnetic iron core are located on at least one end surface of the periphery of the mounting cavity and abut against each other to form a first abutting surface; the first magnetic iron core and / or the second magnetic iron core are / is provided with a bulge in the middle of the mounting cavity, so that the first magnetic iron core and the second magnetic iron core are second contact surfaces; the flexible circuit board is stacked in the mounting cavity, and the coil is annularly arranged between the first abutting surface and the second abutting surface. According to the transformer, the flexible circuit boards are installed in a stacked mode, so that the size of the transformer is reduced, the requirement of electronic products for element miniaturization can be met, the transformer can be adapted to various electronic devices, and the applicability of the transformer is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of transformers, and more specifically, particularly relates to a micro-transformer. Background Art

[0002] Transformers are mainly used for voltage conversion, capable of raising or lowering the input AC voltage to the required value, thus effectively ensuring that these devices can operate normally, stably and safely, and enabling them to perform their due functions. With the continuous progress of integrated circuits and the increasing miniaturization of electronic devices, the requirements for power conversion and voltage regulation have become more stringent. However, traditional transformers usually have a large structural form, with a relatively large volume, occupying a large space, and a relatively heavy weight, resulting in the inability to meet the requirements of electronic products and being unable to be adapted to electronic products that are sensitive to space and weight, reducing the applicability of the transformer. Summary of the Utility Model

[0003] In order to solve the above technical problems, the utility model provides a micro-transformer to solve the technical problems in the prior art that traditional transformers are large in volume and weight, unable to meet the requirements of electronic products, and unable to be adapted to electronic devices, reducing the applicability of the transformer.

[0004] The purpose and efficacy of a micro-transformer of the utility model are achieved by the following specific technical means:

[0005] A micro-transformer includes a first magnetic core and a second magnetic core arranged opposite to each other, and multiple flexible circuit boards provided with coils. An installation groove is recessed in the middle of the first magnetic core and / or the second magnetic core, so as to form an installation cavity between the first magnetic core and the second magnetic core;

[0006] At least one end face of the first magnetic core and the second magnetic core located on the periphery of the installation cavity abuts against each other, forming a first abutting surface between the first magnetic core and the second magnetic core; a protrusion is provided in the middle of the first magnetic core and / or the second magnetic core located in the installation cavity, forming a second abutting surface between the first magnetic core and the second magnetic core;

[0007] The flexible circuit boards are stacked in the installation cavity, and the coils are arranged in a ring between the first abutting surface and the second abutting surface.

[0008] The arrangement in a ring between the first abutting surface and the second abutting surface means that the coils are gradually spirally arranged outward around the second abutting surface, and the second abutting surface is arranged on the periphery of the coils, so that at least part of the coils is clamped between the first abutting surface and the second abutting surface.

[0009] According to a preferred embodiment, the outer edge of the mounting groove of the first magnetic core and / or the second magnetic core is a first contact surface, and a protrusion provided in the middle of the mounting cavity of the first magnetic core or the second magnetic core is a second contact surface. The coil is arranged around the second contact surface and enclosed within the first contact surface.

[0010] The term "enclosed" means that the center of the coil spirals gradually outward around the second contact surface, and the second contact surface surrounds the periphery of the coil, forming an enclosure for the coil.

[0011] For the case where both the first magnetic core and the second magnetic core are provided with concave mounting grooves: the outer edges of their mounting grooves are adapted to form a first contact surface.

[0012] For the case where one of the first magnetic core and the second magnetic core is provided with a concave mounting groove: the outer edge of the magnetic core with the mounting groove protrudes towards the other magnetic core and abuts against the other magnetic core to form a first contact surface.

[0013] According to a preferred embodiment, a notch is provided at the outer edge of the mounting groove of the first magnetic core or the second magnetic core.

[0014] According to a preferred embodiment, there are two or more notches.

[0015] According to a preferred embodiment, a part of the flexible circuit board extends outside the notch, and the wiring holes of the flexible circuit board are located in the area where it extends outside the notch.

[0016] According to a preferred embodiment, two of the notches are arranged facing each other, and both ends of the flexible circuit board extend outside the two facing notches, and wiring holes or pads are provided in the area where it extends outside the notches.

[0017] Compared with the prior art, the present utility model has the following beneficial effects:

[0018] 1. The first magnetic core is connected to the second magnetic core to form an installation cavity. Multiple groups of circuit boards are arranged in the installation cavity, and coils are arranged on the circuit boards, effectively reducing the volume and weight of the transformer significantly, meeting the strict requirements of electronic products for component miniaturization, and being easily adapted to various electronic devices. Notches are provided at the outer edge of the installation groove of the first magnetic core or the second magnetic core, facilitating the wiring of the transformer. Through these notches, the wiring operation can be carried out more smoothly and efficiently, reducing the obstacles and inconveniences during the wiring process. At the same time, the number of notches is more than two, and the multiple notches cooperate with the installation cavity to form a heat dissipation channel. When the transformer generates heat during operation, the heat can be quickly dissipated through these heat dissipation channels, effectively reducing the temperature inside the transformer, avoiding problems such as performance degradation, faults, and even damage caused by overheating, and improving the working stability and service life of the transformer. The flexible circuit board is provided with wiring holes in the area where the installation cavity extends beyond the notches. Through the wiring holes, the combined connection operation with the coil is facilitated. At the same time, the wiring holes also provide a convenient channel for its connection with the power supply module, ensuring stable and efficient power transmission, and effectively improving the performance and reliability of the entire circuit system.

[0019] 2. The connection structure of the first magnetic core and the second magnetic core is compact and small in volume, with a high current density, enabling efficient energy transmission in a limited space. The efficiency is as high as 98%-99%, greatly reducing energy loss. At the same time, the low leakage inductance characteristic makes its performance more stable and reliable, only about 0.2% of the primary inductance. The good heat conduction performance ensures a short distance of the heat channel and a low temperature rise, with a wide working temperature range, and can operate stably in an environment of -40°C to 130°C. The low EMI radiation reduces the interference to surrounding electronic components. Moreover, its working frequency range is wide, and it can work normally from 50 kHz to 2 MHz, with good parameter repeatability. The through groove formed by winding the coil is sleeved on the positioning block, which is easy to pre-process, ensuring the stable and consistent performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the structural schematic diagram of the assembled utility model.

[0021] Figure 2 is the structural schematic diagram of the disassembled utility model.

[0022] Figure 3 is the front view of the utility model;

[0023] Figure 4 is the partial structural schematic diagram of the utility model.

[0024] In the figure, the corresponding relationship between the component names and the drawing reference numerals is as follows:

[0025] 11. First magnetic core; 21. Second magnetic core; 22. Notch; 31. Mounting groove; 41. Flexible circuit board; 42. Coil ring; 43. Wiring hole. Detailed implementation mode

[0026] The following further describes in detail the implementation mode of the present utility model in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the technical solutions of the present utility model, but cannot be used to limit the protection scope of the present utility model.

[0027] Embodiment:

[0028] As Figures 1 to 4 shown, a micro-transformer includes a first magnetic core 11 and a second magnetic core 21 arranged facing each other, and multiple flexible circuit boards 41 equipped with coils. A mounting groove 31 is recessed in the middle of the first magnetic core 11 and / or the second magnetic core 21, so as to form a mounting cavity between the first magnetic core 11 and the second magnetic core 21. The mounting cavity provides space for the subsequent component installation and operation.

[0029] The first magnetic core 11 and the second magnetic core 21 are located on the periphery of the mounting cavity, and at least one end face abuts against each other, thereby forming a first abutting surface between the first magnetic core 11 and the second magnetic core 21. The existence of this abutting surface ensures that the two magnetic cores can be combined at the contact part, reduces the possibility of magnetic leakage, and improves the magnetic energy transmission efficiency.

[0030] At the same time, a protruding part is provided in the middle of the first magnetic core 11 and / or the second magnetic core 21 located in the mounting cavity, thereby forming a second abutting surface between the first magnetic core 11 and the second magnetic core 21. This protrusion and the corresponding formed abutting surface further enhance the connection stability and structural strength between the two magnetic cores, so that during the operation of the transformer, it can withstand various external factors and maintain stable performance. The flexible circuit boards 41 are orderly arranged in the mounting cavity in a stacked manner, making full use of the internal space of the mounting cavity and improving the space utilization rate. The coil ring 42 is arranged between the first abutting surface and the second abutting surface. This enables the coil to play the best role in the magnetic field and realize the efficient conversion and transmission of electrical energy.

[0031] The outer edge of the installation groove 31 of the first magnetic core 11 and / or the second magnetic core 21 constitutes the first contact surface, which is the part where the two magnetic cores come into contact and are connected, and also plays an indispensable role in the transmission and enclosure of magnetic energy. Through the tight combination of this contact surface, the leakage of magnetic energy during transmission is effectively reduced, ensuring the efficient transmission and utilization of energy. A protrusion is provided in the middle of the installation cavity of the first magnetic core 11 or the second magnetic core 21, thereby forming the second contact surface, further enhancing the connection stability and integrity between the two magnetic cores. When the transformer is operating, various forces and vibrations will be generated inside, and the second contact surface can effectively resist these influences, keeping the magnetic core in a stable position and good contact state, thus ensuring the normal operation of the transformer and the stable performance of its functions.

[0032] The coil ring 42 is arranged around the second contact surface and is enclosed within the first contact surface. The coil ring 42 enclosed within the first contact surface can be better protected, reducing the interference and influence of external factors on it. Secondly, this enclosed environment helps to optimize the magnetic field distribution, improve the interaction efficiency between the coil and the magnetic field, and thereby enhance the conversion effect of electrical energy and the overall performance of the transformer.

[0033] The outer edge of the installation groove 31 of the first magnetic core 11 or the second magnetic core 21 is also provided with notches 22. There are more than two notches 22, and the multiple notches 22 cooperate with the installation cavity to form a heat dissipation channel. When the transformer generates heat during operation, the heat can be quickly dissipated through these heat dissipation channels, effectively reducing the temperature inside the transformer, avoiding problems such as performance degradation, faults, and even damage caused by overheating, and improving the working stability and service life of the transformer.

[0034] The flexible circuit board 41 partially extends outside the notch 22 for better realization of circuit connection and function expansion. The wiring holes 43 of the flexible circuit board 41 are located in the area where it extends outside the notch 22, facilitating the wiring operation and making the circuit connection more convenient and reliable.

[0035] Two of the notches 22 are arranged facing each other, providing a direction and space for the extension of the flexible circuit board 41. The two ends of the flexible circuit board 41 respectively extend outside these two notches 22 arranged facing each other, and wiring holes 43 are provided in the area where it extends outside the notch 22. This makes the wiring neater and more orderly, reducing the chaos and crossing of the lines, and improving the stability and reliability of the circuit; while the solder pads are like stable connection points, ensuring the reliability and stability of the line connection.

[0036] The above shows and describes the basic principles, main features, and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments.

Claims

1. A micro-transformer, comprising a first magnetic core (11) and a second magnetic core (21) arranged opposite to each other, and a plurality of flexible circuit boards (41) provided with coils, wherein: The second magnetic core (21) is located above the first magnetic core (11). An installation groove (31) is recessed in the middle of the first magnetic core (11) and / or the second magnetic core (21), so as to form an installation cavity between the first magnetic core (11) and the second magnetic core (21); At least one end face of the first magnetic core (11) and the second magnetic core (21) located at the periphery of the installation cavity abuts against each other, forming a first abutting surface between the first magnetic core (11) and the second magnetic core (21); A protrusion is provided in the middle of the installation cavity of the first magnetic core (11) or the second magnetic core (21), forming a second abutting surface between the first magnetic core (11) and the second magnetic core (21); The flexible circuit board (41) is stacked in the installation cavity, and the coil ring (42) is arranged between the first abutting surface and the second abutting surface.

2. The micro-transformer according to claim 1, wherein: The outer edge of the installation groove (31) of the first magnetic core (11) or the second magnetic core (21) is the first abutting surface, and a protrusion is provided in the middle of the installation cavity of the first magnetic core (11) or the second magnetic core (21) as the second abutting surface. The coil ring (42) is arranged around the second abutting surface and is enclosed within the first abutting surface.

3. A micro-transformer according to claim 1, characterized in that: A notch (22) is provided on the outer edge of the installation groove (31) of the first magnetic core (11) or the second magnetic core (21).

4. The micro-transformer according to claim 3, wherein: There are two or more of the notches (22).

5. A micro-transformer according to claim 3, characterized in that: A part of the flexible circuit board (41) extends outside the notch (22), and the wiring holes (43) of the flexible circuit board (41) are located in the area where it extends outside the notch (22).

6. A micro-transformer according to claim 4, characterized in that: Two of the notches (22) are arranged facing each other. Both ends of the flexible circuit board (41) extend outside the two notches (22) arranged facing each other, and wiring holes (43) or pads are provided in the area where it extends outside the notch (22).

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