CN213716694U

CN213716694U - High-frequency interference signal suppression transformer

Info

Publication number: CN213716694U
Application number: CN202023191766.2U
Authority: CN
Inventors: 黄子田
Original assignee: Fuhua Electronic Co ltd
Current assignee: Fuhua Electronic Co ltd
Priority date: 2020-12-27
Filing date: 2020-12-27
Publication date: 2021-07-16
Anticipated expiration: 2030-12-27

Abstract

The utility model discloses a high frequency interference signal restraines transformer, include: the planar magnetic core is arranged at the bottom, a framework is embedded in the central magnetic column, an output winding N1 is wound on the innermost side of the framework, and the starting end of the output winding N1 is wound from the lower part of the framework; compared with the prior art, the utility model discloses an at the innermost coiling output winding N1 of transformer skeleton and at the outermost coiling second output winding N4 of skeleton, and with two output winding uses in parallel, coiling primary winding N2 between two-layer output winding, the control winding of coiling one end ground connection between primary winding N2 and output winding N1, wrap up the grounded shielding copper foil of one deck in primary winding N2 outside, thereby effectively promote power product EMI performance, satisfy various test requirements. Adopt the utility model discloses a manufacturing switching power supply can reduce product cost.

Description

High-frequency interference signal suppression transformer

Technical Field

The utility model relates to an electrical parts among the network power supply, especially high frequency interference signal suppression transformer among the switching power supply.

Background

In order to improve the EMI reliability of power supply products, a high-power supply in a network power supply, a sound power supply, medical equipment and the like in the prior art adopts two-stage common mode input for primary alternating current of a circuit, an X capacitor is additionally arranged, a primary common mode inductor is arranged on a secondary part, and a transformer adopts a primary sandwich winding process.

The power supply EMI structure is very complex, the requirement of a circuit framework on devices is very high, the debugging difficulty is high, the product cost is high, the consistency of the EMC during the product production is poor, and great troubles are brought to the design and the production.

In recent years, the EMC requirements of various countries in the world on products are more and more strict, the random inspection frequency of the products is also improved, the EMC problems of the products appearing on the market are more and more, the EMC performance of power supply equipment directly influences the stability of terminal products, and especially, the EMC requirements of some terminal medical products are higher, so the EMC of power supply products are more and more important, and the higher requirements are put forward on the design of the products.

In a switching power supply, a transformer is an important device influencing EMC indexes, and how to improve the electromagnetic interference of the transformer designed by the traditional process exceeds the standard is a research subject.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome prior art's power EMI structure is very complicated, and the circuit framework is very high to the requirement of device, and the debugging degree of difficulty is big, and product cost is high, and EMC's uniformity is poor during product production, has all brought the problem of considerable trouble for design and volume production, provides a high frequency interference signal and restraines transformer.

In order to achieve the above object, the utility model provides a following technical scheme:

designing and manufacturing a high-frequency interference signal suppressing transformer, the transformer comprising:

the planar magnetic core is arranged at the bottom, a framework is embedded in the central magnetic column, an output winding N1 is wound on the innermost side of the framework, and the starting end of the output winding N1 is wound from the lower part of the framework;

winding a control winding N3 outside the output winding N1, wherein the control winding N3 is in three-strand flat winding, and the starting end of the output winding N1 starts to be wound from the lower part of the framework;

winding a primary winding N2 outside the control winding N3, wherein the primary winding N2 has 78 turns, a first layer of 27 turns, a second layer of 26 turns and a third layer of 25 turns, and the starting end of the control winding N3 starts to be wound from the lower part of the framework;

outside the control winding N3, a shielding layer E1 is wound, the shielding layer E1 is a layer, and after head and tail welding, a lead is connected with the tail end of the control winding N3;

and a second output winding N4 is wound outside the shielding layer E1, and the starting end of the second output winding N4 starts to be wound from the lower part of the framework.

And the second layer of wire of the primary winding N2 falls into the concave seam between the two wires of the first layer for winding, and the third layer of wire falls into the concave seam between the two wires of the second layer for winding.

The output winding N1 is connected with the head and tail of the second output winding N4 in parallel.

Preparing a transformer leading-out pin at one side of the bottom of the framework, wherein the pin (i) is connected with the tail end of a primary winding N2; the pin II is connected with the initial end of the primary winding N2; the pin III is connected with the tail end of the control winding N3 and the shielding layer E1; and the pin (r) is connected with the starting end of the control winding (N3).

The other side of the bottom of the framework is also provided with a transformer leading-out pin, wherein the pin is connected with the starting end of a second output winding N4; pin II is connected with the starting end of the output winding N1; the pin part is connected with the tail end of the second output winding N4; a pin (b) is connected to the tail end of the output winding (N1).

Compared with the prior art, the utility model discloses an at the innermost coiling output winding N1 of transformer skeleton and at the outermost coiling second output winding N4 of skeleton, and with two output winding uses in parallel, coiling primary winding N2 between two-layer output winding, the control winding of coiling one end ground connection between primary winding N2 and output winding N1, wrap up the grounded shielding copper foil of one deck in primary winding N2 outside, thereby effectively promote power product EMI performance, satisfy various test requirements. Adopt the utility model discloses a manufacturing switching power supply can reduce product cost.

Drawings

Fig. 1 is a schematic structural diagram of a winding manner of a high-frequency interference signal suppression transformer according to a first embodiment of the present invention;

fig. 2 is a schematic front view of the high-frequency interference signal suppressing transformer of the present invention;

fig. 3 is an electrical schematic diagram of the high-frequency interference signal suppressing transformer of the present invention;

fig. 4 is a circuit diagram of an embodiment of the high-frequency interference signal suppressing transformer of the present invention applied to a switching power supply.

Detailed Description

EMC refers to the ability of a device or system to operate satisfactorily in its electromagnetic environment and not to generate intolerable electromagnetic interference to any device in its environment.

As shown in fig. 1 to 4, an embodiment of the present invention includes:

the magnetic core 11 is arranged at the bottom, the central magnetic column is embedded with a framework 2, and the framework 2 is provided with a framework top 21 and a framework bottom 22;

as shown in fig. 1, an output winding N1 is wound on the innermost side of the framework, and the starting end of the output winding N1 starts to be wound from the lower part of the framework;

as shown in fig. 2, a shielding layer E1 is wound outside the control winding N3, and the shielding layer E1 is a layer, and is connected to the tail end of the control winding N3 by a lead wire after head-to-tail welding;

as shown in fig. 1, a second output winding N4 is wound outside the shielding layer E1, and the start end of the second output winding N4 starts to be wound from the lower part of the bobbin.

As shown in fig. 1, the second layer of wire of the primary winding N2 falls into the recessed gap between the two wires of the first layer and the third layer of wire falls into the recessed gap between the two wires of the second layer.

As shown in fig. 3, the output winding N1 is connected end to end with the second output winding N4.

As shown in fig. 1, a transformer leading-out pin is prepared on one side of the framework bottom 22 of the framework 2, wherein the pin (r) is connected with the tail end of a primary winding N2; the pin II is connected with the initial end of the primary winding N2; the pin III is connected with the tail end of the control winding N3 and the shielding layer E1; and the pin (r) is connected with the starting end of the control winding (N3).

As shown in fig. 3, a transformer leading-out pin is also prepared on the other side of the bobbin bottom 22, wherein the pin is connected with the starting end of the second output winding N4; pin II is connected with the starting end of the output winding N1; the pin part is connected with the tail end of the second output winding N4; a pin (b) is connected to the tail end of the output winding (N1).

As shown in fig. 4, the embodiment of the present invention provides a circuit diagram, and the high-frequency interference signal suppressing transformer is applied to a switching power supply.

Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the scope of the present invention, for example, the number of turns of the output winding N1 and the second output winding N4 is changed, the number of turns of the primary winding N2 and the control winding N3 is changed, and all belong to the scope of the present invention.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A high frequency interference signal rejection transformer, said transformer comprising: the planar magnetic core (11) is arranged at the bottom, the central magnetic column is embedded with a framework (2), an output winding N1 is wound on the innermost side of the framework, and the starting end of the output winding N1 is wound from the lower part of the framework;

2. The high-frequency interference signal suppressing transformer according to claim 1, characterized in that: and the second layer of wire of the primary winding N2 falls into the concave seam between the two wires of the first layer for winding, and the third layer of wire falls into the concave seam between the two wires of the second layer for winding.

3. The high-frequency interference signal suppressing transformer according to claim 1, characterized in that: the output winding N1 is connected with the head and tail of the second output winding N4 in parallel.

4. The high-frequency interference signal suppressing transformer according to claim 1, characterized in that: preparing a transformer leading-out pin at one side of the framework bottom (22) of the framework (2), wherein the pin (i) is connected with the tail end of a primary winding N2; the pin II is connected with the initial end of the primary winding N2; the pin III is connected with the tail end of the control winding N3 and the shielding layer E1; and the pin (r) is connected with the starting end of the control winding (N3).

5. The high-frequency interference signal suppressing transformer according to claim 4, wherein: the other side of the framework bottom (22) is also provided with a transformer leading-out pin, wherein the pin is connected with the starting end of the second output winding N4; pin II is connected with the starting end of the output winding N1; the pin part is connected with the tail end of the second output winding N4; a pin (b) is connected to the tail end of the output winding (N1).