CN213635649U - Planar transformer for small power supply - Google Patents

Abstract

The utility model provides a planar transformer for small-size power. The planar transformer for the small power supply comprises a magnetic core, a coil holder, a winding and a shell; wherein the windings comprise an Np winding, an Ne winding, and an Ns winding; the magnetic cores are divided into a left magnetic core and a right magnetic core which are symmetrical; the left magnetic core and the right magnetic core are assembled to generate a magnetic circuit; the wire frame is attached to the magnetic core; the winding is wound on the wire frame; the Ns winding and the Np winding are arranged at the bottommost layer of the bobbin; the Ne winding is wound on the outermost layer of the bobbin; the shell comprises 6 pins for leading out the input and the output of the winding by adopting a lead. The transformer adopts the mode of layered winding and independent winding insulation, solves the contradiction between the volume and the insulation capacity of the transformer, and designs the transformer for the small power supply.

Description

Planar transformer for small power supply

Technical Field

The utility model relates to an electron electric field, in particular to a planar transformer for small-size power.

Background

With the continuous development of power electronic technology, the volume of electronic equipment is also becoming smaller, and especially the volume of small-sized electrical equipment is reduced from the original meter level to the centimeter level. However, for supplying power to some electrical devices with larger power, a transformer with enough capacity is generally required, but the volume of the conventional transformation does not change too much. The main reasons are that the existing transformer has poor coil insulation capability, and the winding mode and the installation mode of the transformer are unreasonable. Therefore, there is a need to design transformers for small power supplies to address the conflict between transformer size and insulating capability.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that need solve is that the coil insulating ability of current transformer is poor, and the wire winding mode and the mounting means of transformer are unreasonable.

In order to solve the above problem, the utility model provides a planar transformer for small-size power supply, the technical scheme of its adoption as follows: the planar transformer for the small power supply comprises a magnetic core, a coil holder, a winding and a shell; wherein the windings comprise an Np winding, an Ne winding, and an Ns winding; the magnetic cores are divided into a left magnetic core and a right magnetic core which are symmetrical; the left magnetic core and the right magnetic core are assembled to generate a magnetic circuit; the wire frame is attached to the magnetic core; the wire frames comprise a left wire frame and a right wire frame, and the left wire frame and the right wire frame respectively correspond to the left magnetic core and the right magnetic core of the magnetic core; the winding is wound on the wire frame; the Ns winding and the Np winding are arranged at the bottommost layer of the bobbin; the Ne winding is wound on the outermost layer of the bobbin; the shell comprises 6 pins for leading out the input and the output of the winding by adopting a lead.

Preferably, the winding is composed of copper sheets, and the surface of each copper sheet is insulated by a high-temperature electric insulation coating.

Preferably, the middle of a magnetic loop formed by the left magnetic core and the right magnetic core is a hollow square, and the planar transformer for the small power supply is mounted in a sleeve mode.

Preferably, the winding is wound using a multilayer printed circuit board.

Preferably, the Np winding is a primary winding, the Ne winding is a low-voltage secondary winding, and the Ns winding is a high-voltage secondary winding.

Preferably, the housing is cylindrical with a diameter of 16mm, and the length of the 6 pins on the housing is 15 mm.

Preferably, the 6 pins on the housing include a first pin, a second pin, a third pin, a fourth pin, a fifth pin, and a sixth pin; the first pin and the second pin are input and output of the Np winding respectively; the third pin and the fourth pin are input and output of the Ne winding, respectively; the fifth pin and the sixth pin are input and output of the Ns winding, respectively.

Preferably, the magnetic core is an E-shaped magnetic core and is made of high-frequency power ferrite materials.

Preferably, the Ne winding is insulated by three layers and is wound for 2 circles, and the three layers of insulation comprise paint spraying insulation, high-temperature electric insulation and rubber insulation.

Preferably, the Ns winding and the Np winding are wound for 6 turns and 3 turns, respectively; the Ns winding adopts a single-layer copper sheet with the cross section of 3mm and the thickness of 0.3 mm; the Np winding adopts a single-layer copper sheet with the cross section of 2.5mm and the thickness of 0.15 mm.

The utility model has the advantages that:

1. the winding adopts a high-temperature electric insulation coating, and the outermost layer adopts three layers of insulation, so that the winding can keep electric insulation performance at high temperature, can be tightly combined with a metal wire, and is not easy to generate a breakdown phenomenon.

2. A layered winding mode is adopted, three windings are wound in the same bobbin area, and the problem of overhigh temperature caused by overlarge magnetic field difference is solved.

Drawings

Fig. 1 is a structural diagram of a planar transformer for a small power supply according to an embodiment of the present invention.

Fig. 2 is an electrical schematic diagram of a planar transformer for a small power supply according to an embodiment of the present invention.

Fig. 3 is a winding stacking diagram of a planar transformer for a small power supply according to an embodiment of the present invention.

Fig. 4 is a diagram of the dimensions of a housing of a planar transformer for a small power supply according to an embodiment of the present invention.

Detailed Description

The present disclosure is described below based on embodiments, but the present disclosure is not limited to only these embodiments. In the following detailed description of the present disclosure, certain specific details are set forth in detail. A full understanding of the present disclosure may be gained to those skilled in the art without the benefit of this description. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present disclosure.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout this specification, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present disclosure, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present disclosure, "a plurality" means two or more unless otherwise specified.

As shown in fig. 1, fig. 1 is a structural diagram of a planar transformer for a small power supply according to an embodiment of the present invention. The planar transformer for the small power supply comprises a magnetic core 1, a coil holder 2, a winding 3 and a shell 4; wherein the windings 3 comprise an Np winding 5, an Ne winding 7, an Ns winding 6; the magnetic cores are divided into a left magnetic core and a right magnetic core which are symmetrical; the left magnetic core and the right magnetic core are assembled to generate a magnetic circuit; the wire frame 2 is attached to the magnetic core; the wire frame 2 comprises a left wire frame and a right wire frame, and the left wire frame and the right wire frame respectively correspond to the left magnetic core and the right magnetic core of the magnetic core; the winding 3 is wound on the bobbin 2; the Ns winding 6 and the Np winding 5 are arranged at the bottommost layer of the bobbin 2; the Ne winding 7 is wound on the outermost layer of the bobbin 2; the shell 4 comprises 6 pins for leading out the input and output of the winding 3 by adopting wires.

In one or more embodiments, the magnetic core and the bobbin 2 are provided with detachable structures, and during the integral winding process, the magnetic core and the bobbin can be divided into two parts to be independently wound and then integrally combined. Therefore, in this way, rapid winding can be achieved. Specifically, a certain space may be included in the middle of the magnetic core of the split structure for installing the transformer.

Specifically, the planar transformer means that the thickness of the whole transformer is very small, the magnetic core and the winding 3 of the whole transformer are of a planar structure, and the whole transformer can be mounted in a multilayer PCB mode. Among them, a Printed Circuit Board (PCB-Printed Circuit Board) may be referred to as a Printed wiring Board, and the Printed Circuit Board refers to: an assembly board for selectively processing mounting holes, connecting wires and pads for assembling and welding electronic components on the insulating substrate to realize electrical connection between the components; specifically, in one or more embodiments, the bobbin 2 is the insulating substrate.

By the mode, the layered winding mode of the winding 3 is integrally realized, and the winding is well installed and wound.

As shown in fig. 2, fig. 2 is an electrical schematic diagram of a planar transformer for a small power supply according to an embodiment of the present invention. The Np winding 5 is a primary winding, the Ne winding 7 is a low-voltage secondary winding, and the Ns winding 6 is a high-voltage secondary winding. The Ns winding 6 and the Np winding 5 are wound for 6 circles and 3 circles respectively; the Ns winding 6 adopts a single-layer copper sheet with the cross section of 3mm and the thickness of 0.3 mm; the Np winding 5 is a single-layer copper sheet with the cross section of 2.5mm and the thickness of 0.15 mm.

In one or more embodiments, the voltage ratio between the primary side, the low voltage and the high voltage of the whole transformer is 3:2:6, so that the transformer of the present invention can boost or reduce the voltage.

Fig. 3 is a winding stacking diagram of a planar transformer for a small power supply according to an embodiment of the present invention, as shown in fig. 3. The winding 3 is composed of copper sheets, and the surface of each section of copper sheet is insulated by adopting a high-temperature electric insulation coating.

The winding 3 is wound by adopting a multilayer printed circuit board.

The magnetic core is an E-shaped magnetic core and is made of high-frequency power ferrite materials.

Specifically, the high-frequency ferrite material generally adopts a NiZn material because of having both higher magnetic and dielectric properties and high resistivity. Since the ferrite of the NiZn material has a higher resistivity than others and a saturation magnetic flux density of 0.3T, it is very suitable for applications in a high frequency region.

In one or more embodiments, the magnetic core is an E-type magnetic core, which is suitable for miniaturization due to its advantages of low thermal resistance, low attenuation, high power, and wide operating frequency.

The Ne winding 7 adopts three layers of insulation and is wound for 2 circles, and the three layers of insulation comprise paint spraying insulation, high-temperature electric insulation and rubber insulation.

In one or more embodiments, since the heat dissipation of the inner coil is more difficult, and the heat generated at the high-voltage side is the largest, and the heat dissipation needs to be rapidly released, the Ns winding 6 is placed at the outer side, the Np winding 5 is placed at the middle layer of the Ns coil, and the Ne winding 7 is placed at the outermost side for the low-voltage winding, so that the overall rapid heat dissipation can be ensured; specifically, the inner layer of the bobbin 2 includes the Ns winding 6 in two parts, including the Np winding 5 in the middle, and the Ne winding 7 is at the outermost side, in order to ensure sufficient heat dissipation without damage due to heat generation.

In one or more embodiments, the high temperature electrically insulating coating may be classified into a number of categories depending on its chemical composition. Such as boron nitride or aluminum oxide, copper fluoride coating on the surface of graphite conductor, still has good electric insulation performance to 400 ℃. The enamel on the metal wire is up to 700 deg.C, the phosphate-based inorganic adhesive is coated up to 1000 deg.C, and the plasma sprayed alumina coating still has good electric insulation performance at 1300 deg.C.

By the mode, the winding 3 realizes integral heat insulation and insulation, the insulating capability of the planar transformer for the small power supply is improved, and the integral volume is not increased.

As shown in fig. 4, fig. 4 is a size diagram of a case of a planar transformer for a small power supply according to an embodiment of the present invention.

The middle of a magnetic loop formed by the left magnetic core and the right magnetic core is a hollow square, and the planar transformer for the small power supply is installed in a sleeve mode.

The shell 4 is cylindrical with a diameter of 16mm, and the length of 6 pins on the shell 4 is 15 mm.

The 6 pins on the shell 4 comprise a first pin, a second pin, a third pin, a fourth pin, a fifth pin and a sixth pin; the first pin and the second pin are input and output of the Np winding 5, respectively; the third pin and the fourth pin are input and output of the Ne winding 7, respectively; the fifth pin and the sixth pin are input and output of the Ns winding 6, respectively.

In one or more embodiments, the configuration of the enclosure 4 results from the presence of the enclosure 4, which ensures that the entire transformer is not subjected to external environmental influences. In particular, configuring each pin to be longer, respectively, may ensure easy connection to external wiring. In the above structure, the volume of the whole casing 4 of the planar transformer for small power supply is only 2cm, but the wiring is very convenient, and the wiring or other fixing points can directly pass through the center of the magnetic core 1 and the installation position. Thus, the external connection and installation are very quick.

In the embodiment, the transformer adopts a mode of layered winding and independent winding insulation, solves the contradiction between the transformer volume and the insulation capacity, and designs the transformer for the small power supply.

The above embodiments are only used for illustrating the present invention, and not for limiting the present invention, and those skilled in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention, so that all equivalent technical solutions also belong to the scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims (10)

1. A planar transformer for a small power supply is characterized by comprising a magnetic core, a coil holder, a winding and a shell; wherein the windings comprise an Np winding, an Ne winding, and an Ns winding; the magnetic cores are divided into a left magnetic core and a right magnetic core which are symmetrical; the left magnetic core and the right magnetic core are assembled to generate a magnetic circuit; the wire frame is attached to the magnetic core; the wire frames comprise a left wire frame and a right wire frame, and the left wire frame and the right wire frame respectively correspond to the left magnetic core and the right magnetic core of the magnetic core; the winding is wound on the wire frame; the Ns winding and the Np winding are arranged at the bottommost layer of the bobbin; the Ne winding is wound on the outermost layer of the bobbin; the shell comprises 6 pins for leading out the input and the output of the winding by adopting a lead.

2. A planar transformer for a compact power supply as claimed in claim 1, wherein said winding is comprised of copper sheets, each section of copper sheet being insulated on its surface by a high temperature electrically insulating coating.

3. The planar transformer for a small power supply as claimed in claim 1, wherein the magnetic circuit formed by said left magnetic core and said right magnetic core is a hollow square in the middle, and said planar transformer for a small power supply is mounted in a telescopic manner.

4. A planar transformer for a compact power supply as claimed in claim 1, wherein said windings are wound using a multilayer printed circuit board.

5. The planar transformer for a compact power supply of claim 1, wherein said Np winding is a primary winding, said Ne winding is a low voltage secondary winding, and said Ns winding is a high voltage secondary winding.

6. A planar transformer for a compact power supply as claimed in claim 1, wherein said housing is cylindrical with a diameter of 16mm and the length of the 6 pins on said housing is 15 mm.

7. The planar transformer for a compact power supply of claim 1, wherein the 6 pins on the housing comprise a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin; the first pin and the second pin are input and output of the Np winding respectively; the third pin and the fourth pin are input and output of the Ne winding, respectively; the fifth pin and the sixth pin are input and output of the Ns winding, respectively.

8. A planar transformer for a compact electric power supply as claimed in claim 1, wherein said core is an E-shaped core made of a high frequency power ferrite material.

9. The planar transformer for a compact electric power source of claim 1, wherein said Ne winding is wound for 2 turns using triple layer insulation comprising paint insulation, high temperature electrical insulation, rubber insulation.

10. A planar transformer for a small power supply as set forth in claim 1, wherein said Ns winding and said Np winding are wound for 6 turns and 3 turns, respectively; the Ns winding adopts a single-layer copper sheet with the cross section of 3mm and the thickness of 0.3 mm; the Np winding adopts a single-layer copper sheet with the cross section of 2.5mm and the thickness of 0.15 mm.

Images