CN201708001U - Low Leakage Flux High Frequency Transformer - Google Patents

Abstract

The utility model discloses a high-frequency transformer with low magnetic leakage, which comprises a magnetic core and a winding group arranged on the magnetic core, wherein the winding group comprises an annular winding seat and a coil wound on the winding seat, the magnetic core comprises an upper cover, a lower cover and a fixing part which can enable the upper cover and the lower cover to be mutually buckled, and the bottom of an inner cavity of the lower cover is provided with a convex cylinder which is matched with an inner ring of the annular winding seat and can be inserted into the inner ring; the utility model has the advantages of reasonable design, it is inseparable, the magnetic core comprises upper cover and lower cover, the coil is the complete cladding in it, can reduce because of the magnetic leakage, the radiation noise that the leakage inductance produced, the reliability of product has been improved, make magnetic field energy obtain abundant utilization, the conversion efficiency and the output of power have been improved, energy saving, and can be effectively with the magnetic leakage of transformer, the leakage inductance, the skin, trend and neighbouring effect reduce to minimum, reduce the injury to the human body, small in addition, loading and unloading are convenient, be particularly useful for less type power supply or adapter.

Description

Low Leakage Flux High Frequency Transformer

technical field

The utility model relates to a transformer, in particular to a high-frequency transformer with low magnetic leakage.

Background technique

According to Faraday's law of electromagnetic induction, in an alternating circuit, the magnetic lines of force change with time, so the voltage level and the current level will also change accordingly. People have manufactured various forms of transformers according to this principle. In recent years, switching power supply technology is developing towards high efficiency, energy saving, safety, environmental protection, and small size. In switching power supplies without industrial frequency transformers, high-frequency transformers are one of the core components. The design of high-frequency transformers is the key technology of switching power supplies. Whether the design of high-frequency transformers is reasonable will affect the cost, volume, and Stability, electromagnetic interference, radiated noise, EMI filtering, output power, conversion efficiency, etc.

The magnetic core structure of the traditional transformer is generally in the form of "E", "C" or "O" structure. Because of the structure of "circuit surrounded by magnetic circuit" between these magnetic cores and coils, the coils on both sides Part of the magnetic field cannot be fully utilized. Therefore, the amount of magnetic leakage is large, resulting in low efficiency, large volume, and high cost of the transformer. When the power is supplied, the magnetic field interference is very large, and the temperature is too high, which will cause other parts to be easily damaged. . Moreover, its structural design is not tight enough, and it is prone to problems such as magnetic flux leakage, leakage inductance, iron loss, large excitation current, poor heat dissipation conditions, low efficiency and high noise, and with the increase of frequency, there are even more serious skin problems. Problems such as , trending and proximity effects will cause adverse harm to the human body. In addition, assembly and installation are troublesome enough, which is not conducive to maintenance.

Utility model content

The purpose of this utility model is to provide a high-frequency transformer with compact structure, small volume, high stability, convenient assembly and disassembly, small magnetic flux leakage and less harm to human body.

In order to achieve the above object, the technical solution provided by the utility model is:

A low-leakage magnetic flux high-frequency transformer, which includes a magnetic core and a winding group arranged on the magnetic core, the winding group includes an annular winding base and a coil wound on the winding base, the The magnetic core includes an upper cover, a lower cover, and a fixing piece that enables the upper cover and the lower cover to be fastened to each other. At the bottom of the inner cavity of the lower cover, there is an inner ring that is compatible with the annular winding seat A convex cylinder that can be inserted into it.

The outer edge of the bottom of the winding seat is provided with a plurality of fixing parts for fixing the wire ends of the coil.

There are four fixing parts, which are symmetrically arranged on the bottom of the winding seat respectively.

Corresponding to the position of the fixing part, an opening for exposing the fixing part is provided on the magnetic core.

The fixing part is an elastic sheet body, the two ends of the sheet body are bent to the same side, wherein one end forms an upper buckle, and the other end forms a lower buckle, corresponding to the top of the upper cover An upper buckle matching the upper buckle is provided, and a lower buckle matching the lower buckle is provided at the bottom of the lower cover, which is convenient for disassembly and assembly.

The middle part of the lower buckle part is bent downwards and extended to form a vertical part, which is convenient for installation, fixing and disassembly.

The beneficial effects of the utility model are: the utility model has a reasonable and compact structural design, the magnetic core is composed of an upper cover and a lower cover, and the coil is completely covered in it, which can reduce radiation noise caused by magnetic flux leakage and leakage inductance, and improve Improve the reliability of the product, therefore, also improve the conversion efficiency and output power of the power supply, save energy, make full use of the magnetic field, greatly reduce the damage to other parts, and will provide more stable efficiency for the overall components , and can effectively reduce the magnetic flux leakage, leakage inductance, skin, surface and proximity effects of the transformer to the minimum, and reduce the harm to the human body; , and form an integrated structure of the magnetic core, small size, strong fit, and easy assembly and disassembly, while reducing costs and improving productivity, it is also easy to maintain; especially suitable for smaller power supplies or adapters.

Below in conjunction with accompanying drawing and embodiment, the utility model is further described.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the present utility model;

Fig. 2 is the bottom view structural representation of Fig. 1;

FIG. 3 is a schematic diagram of an exploded structure of FIG. 1 .

Detailed ways

Embodiment, referring to Fig. 1, Fig. 2 and Fig. 3, a low-leakage magnetic flux high-frequency transformer provided in this embodiment includes a magnetic core 1 and a winding group 2 arranged on the magnetic core 1, and the winding The wire group 2 includes an annular winding seat 21 and a coil (not marked) wound on the winding seat 21, the magnetic core 1 includes an upper cover 11, a lower cover 12 and the upper cover 11 can be The fixing part 13 interlocked with the lower cover 12, the magnetic core 1 is composed of the upper cover 11 and the lower cover 12, and the coil is completely covered in it, which can reduce the radiation noise caused by magnetic flux leakage and leakage inductance, and improve the product quality. Therefore, it also improves the conversion efficiency and output power of the power supply, saves energy, makes full use of the magnetic field, greatly reduces the damage to other parts, and will allow the overall components to provide more stable efficiency, and It can effectively reduce the flux leakage, leakage inductance, skin, surface and proximity effects of the transformer to the minimum, and reduce the harm to the human body; at the bottom of the inner cavity of the lower cover 12, there is a ring-shaped winding seat The inner ring 211 of 21 is suitable for the convex cylinder 121 that can be inserted therein. The outer edge of the bottom of the winding base 21 is provided with a plurality of fixing portions 212 for fixing the wire ends of the coils. There are four fixing parts 212 , which are symmetrically arranged on the bottom of the winding base 21 respectively. Corresponding to the position of the fixing portion 212 , an opening 14 for exposing the fixing portion 212 is provided on the magnetic core 1 . The fixing part 13 is an elastic sheet body, the two ends of the sheet body are bent to the same side, wherein one end forms an upper buckle 131, and the other end forms a lower buckle 132, and corresponds to the The top of the upper cover 11 is provided with an upper buckle position 15 compatible with the upper buckle portion 131, and the lower cover 12 is provided with a lower buckle position 16 compatible with the lower buckle portion 132. The fixing member 13 adopts The fastening structure cleverly fastens the upper cover 11 and the lower cover 12 together to form an integrated structure of the magnetic core 1, which is small in size, firm in fit, and easy to assemble and disassemble. While reducing costs and improving productivity, It is also convenient for maintenance; the middle part of the lower button part 132 is bent downwards and extended to form a vertical part 133, which is convenient for installation, fixing and disassembly.

As described in the above embodiments of the utility model, transformers with other structures obtained by adopting the same or similar structure are within the scope of protection of the utility model.

Claims (6)

1. A low-leakage magnetic flux high-frequency transformer, which includes a magnetic core and a winding set arranged on the magnetic core, characterized in that, the winding set includes an annular winding base and a coil wound on the winding The coil on the seat, the magnetic core includes an upper cover, a lower cover and a fixing piece that can make the upper cover and the lower cover interlock, and a ring-shaped winding seat is provided at the bottom of the inner cavity of the lower cover. A convex cylinder that fits inside the inner ring and can be inserted into it. 2 . The high frequency transformer with low flux leakage according to claim 1 , wherein a plurality of fixing portions for fixing the wire ends of the coils are provided on the outer edge of the bottom of the winding base. 3 . 3. The high-frequency transformer with low flux leakage according to claim 2, characterized in that there are four fixing parts, which are arranged symmetrically on the bottom of the winding base respectively. 4 . The low-leakage flux-leakage high-frequency transformer according to claim 1 or 2, characterized in that: corresponding to the position of the fixing part, an opening for exposing the fixing part is provided on the magnetic core. 5. The low-leakage magnetic flux high-frequency transformer according to claim 1, characterized in that: the fixing member is an elastic sheet-shaped body, the two ends of the sheet-shaped body are bent toward the same side, and one end forms a The upper buckle, the other end forms the lower buckle, and corresponding to the top of the upper cover, there is an upper buckle that matches the upper buckle, and the bottom of the lower cover is provided with a button corresponding to the lower buckle. Fitted bottom button. 6. The high-frequency transformer with low flux leakage according to claim 5, characterized in that: the middle part of the lower buckle part is bent downwards and extended to form a vertical part.

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