CN111564301A - Electromagnetic shielding structure of transformer - Google Patents

Abstract

The invention relates to an electromagnetic shielding structure of a transformer, which is mainly characterized in that a coil group of the transformer extends outwards to form a pin electrically connected with a coil, an insulating tape is wound on the outer edge of an iron core, then an electromagnetic wave shielding copper foil is wound on the outer edge of the iron core, the transformer can be accommodated in an accommodating space of an insulating shell, a metal gasket which is in contact with and electrically conducted is arranged at the bottom end of the accommodating space corresponding to the electromagnetic wave shielding copper foil, each pin of the transformer is connected and conducted with each corresponding contact of a circuit substrate, and the metal gasket is in contact with and electrically conducted with a welding surface of a connecting ground wire of the; therefore, the overall assembly can be faster, the overall assembly stability can be improved, the service life of the product can be prolonged, the electromagnetic interference generated by the transformer can be shielded, the condition influencing the operation of the overall circuit can be prevented, and the practical efficiency characteristic can be improved in the overall implementation and use.

Description

The electromagnetic shielding structure of the transformer

technical field

The present invention relates to an electromagnetic shielding structure for a transformer, in particular to an electromagnetic shielding structure that is not only faster in overall assembly and arrangement, but also improves the stability of the overall assembly and enhances the service life of the product, so as to achieve The electromagnetic interference generated by the transformer is shielded to prevent the situation that affects the operation of the whole circuit, and the electromagnetic shielding structure of the transformer is more practical in its overall implementation and use.

Background technique

According to the press, it is common to see that various transformers are installed on many electronic products, which can be used for voltage conversion, circuit isolation and other actions, and the transformer is very easy to generate electromagnetic interference in the process of voltage conversion [Electromagnetic Interference, EMI] ], especially in high frequency use, the electromagnetic interference situation is more serious, causing electromagnetic radiation to affect the layout circuit and electronic components around the circuit; therefore, in the transformer setting, it is generally grounded to introduce the interference signal into Ground terminal to reduce electromagnetic interference.

Among them, please refer to Announcement No. M570565 "Flyback Power Conversion System" dated November 21, 2018, which includes an electrically isolated transformer and a power conversion circuit arranged on a circuit board. The primary side winding of the transformer is connected to the secondary side winding. A shielding group is arranged between the primary side windings, the shielding group includes a first shielding layer and a second shielding layer, the secondary side winding is located between the first and second shielding layers, and the first shielding layer and the second shielding layer The shielding layer increases the leakage inductance, thereby reducing the electromagnetic interference during system operation. The increased leakage inductance provided by the shielding layer can still be installed in the packaging shell of the specification size by increasing the size of the transformer, thereby increasing the size of the iron core. And the diameter of the winding wire to reduce the copper loss, iron loss and temperature, so it can improve the energy conversion efficiency. Wherein, an insulating tape is wound around the outer surface of the iron core group, and a copper foil layer is wound around the outer surface of the insulating tape, a ground wire is arranged on one side of the copper foil layer, and the end of the ground wire is connected to the ground terminal of the circuit board .

However, although the above-mentioned "flyback power conversion system" can use the setting of the ground wire to achieve the expected effect of reducing electromagnetic interference, it is also found in the actual assembly process that the core group needs to be wound before the outer surface. Insulating tape, and a copper foil layer is wound around the outer surface of the insulating tape, and then the end of the ground wire arranged on one side of the copper foil layer is connected to the ground terminal of the circuit board, which causes not only the connection and setting of the ground wire to be extremely time-consuming , and in the process of ground wire connection construction, if the force is applied carelessly, it is easy to cause fracture, which is more troublesome and inconvenient, so that there is still room for improvement in the overall structural design.

The reason is that, in view of this, the inventor, adhering to the rich experience in design and development and actual production in the related industry for many years, further researches and improves the existing measurement methods and shortcomings, and provides an electromagnetic shielding structure for a transformer, in order to achieve a better purpose of practical value.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide an electromagnetic shielding structure for a transformer, which is not only faster in the overall assembly and arrangement, but also improves the stability of the overall assembly and enhances the service life of the product, so as to achieve The electromagnetic interference generated by the transformer is shielded to prevent the occurrence of situations that affect the operation of the overall circuit, and the utility function is enhanced in its overall implementation and use.

The main purpose and effect of the electromagnetic shielding structure of the transformer of the present invention are achieved by the following specific technical means:

It mainly includes transformers, insulating casings and circuit substrates; of which:

In the transformer, a coil group is arranged in an iron core, and pins electrically connected to the coil are extended outward from the coil group, and an insulating tape is wound around the outer edge of the iron core, and then an insulating tape is arranged outside the insulating tape. There is electromagnetic wave shielding copper foil around it;

The insulating casing is made of insulating material, and an accommodating space is formed in the insulating casing corresponding to the transformer, so that the transformer can be accommodated in the accommodating space, and the bottom end of the accommodating space corresponds to the electromagnetic wave of the transformer The shielding copper foil is provided with a metal gasket, the upper end of the metal gasket is in contact with the electromagnetic wave shielding copper foil for electrical conduction, and the lower end of the metal gasket is exposed at the bottom of the insulating shell;

The circuit substrate is provided with contacts corresponding to the pins of the transformer, so that each of the pins of the transformer is connected with the corresponding contacts, and on the circuit substrate corresponding to the insulating shell The metal gasket is provided with a welding surface for connecting the ground wire, so that the lower end of the metal gasket is in contact with the welding surface for connecting the ground wire and is electrically connected.

Another purpose and effect of the electromagnetic shielding structure of the transformer of the present invention are achieved by the following specific technical means:

It mainly includes transformers, insulating casings and circuit substrates; of which:

In the transformer, a coil group is arranged in an iron core, and pins electrically connected to the coil are extended outward from the coil group, and an insulating tape is wound around the outer edge of the iron core, and then an insulating tape is arranged outside the insulating tape. There is electromagnetic wave shielding copper foil around it;

The insulating casing is made of insulating material, and an accommodating space is formed in the insulating casing corresponding to the transformer, so that the transformer can be accommodated in the accommodating space, and the electromagnetic wave shielding corresponding to the transformer in the accommodating space The copper foil is provided with a metal spacer, the metal spacer is in contact with the electromagnetic wave shielding copper foil and is electrically connected, and a metal pin is protruded outward from the insulating shell, and the metal pin is electrically connected to the metal spacer;

The circuit substrate is formed with a hollow portion for the insulating shell to be assembled correspondingly, and a contact is provided on the circuit substrate corresponding to each of the pins of the transformer, so that each of the pins of the transformer is connected to the corresponding contact. The phases are connected and conducted, and the metal pin corresponding to the insulating shell is provided with a connection ground wire welding point on the circuit substrate, so that the metal pin and the connection ground wire welding point are connected and conducted.

In a preferred embodiment of the electromagnetic shielding structure of the transformer of the present invention, the coil set of the transformer is composed of several coils wound, and electromagnetic wave shielding copper wires are wound between the two coils.

In a preferred embodiment of the electromagnetic shielding structure of the transformer of the present invention, an insulating tape is provided on the outer edge of the coil assembly of the transformer and between the coil and the electromagnetic wave shielding copper wire.

Description of drawings

Fig. 1 is the three-dimensional exploded structure schematic diagram of the present invention

Fig. 2 is the partial three-dimensional exploded structure schematic diagram of the present invention

Fig. 3 is the combined cross-sectional structure schematic diagram of the present invention

4 is a schematic diagram of a three-dimensional exploded structure of another embodiment of the present invention

5 is a schematic diagram of a partial three-dimensional exploded structure of another embodiment of the present invention

FIG. 6 is a schematic diagram of a combined cross-sectional structure of another embodiment of the present invention.

Reference number:

(1) Transformer

(11) Iron core

(12) Coil set

(121) Coil

(122) Electromagnetic wave shielding copper wire

(123)Insulating tape

(13) Pins

(14)Insulating tape

(15) Electromagnetic wave shielding copper foil

(2) Insulating shell

(21) accommodating space

(22) Metal gasket

(23) Metal pins

(3) Circuit board

(31) Contact

(32) Connect the ground wire welding surface

(33) Hollow part

(34) Connect the ground wire welding point

Detailed ways

In order to have a more complete and clear disclosure of the technical content, the purpose of the invention and the effect achieved by the present invention, the following detailed description is given, and please refer to the disclosed drawings and drawing numbers together:

First, please refer to the schematic diagram of the three-dimensional exploded structure of the present invention in FIG. 1 , the schematic diagram of the partial three-dimensional exploded structure of the present invention in FIG. 2 and the combined cross-sectional structure diagram of the present invention in FIG. 3 , the present invention mainly includes a transformer (1), an insulating shell (2) and circuit substrate (3); wherein:

The transformer (1) is provided with a coil set (12) in an iron core (11), the coil set (12) is formed by winding several coils (121), and between two coils (121) An electromagnetic wave shielding copper wire (122) is wound around, and an insulating tape (123) may be arranged on the outer edge of the coil set (12) and between the coil (121) and the electromagnetic wave shielding copper wire (122), and the Pins (13) electrically connected to the coil (121) extend outward from the coil assembly (12), and an insulating tape (14) is wound around the outer edge of the iron core (11), and then the insulating tape (14) is wound around the outer edge of the core (11). ) is provided with electromagnetic wave shielding copper foil (15) around it.

The insulating casing (2) is made of insulating material, and an accommodating space (21) is formed in the insulating casing (2) corresponding to the transformer (1), so that the transformer (1) can be accommodated in the accommodating space (21). In the space (21), a metal gasket (22) is provided at the bottom end of the accommodating space (21) corresponding to the electromagnetic wave shielding copper foil (15) of the transformer (1), and the upper end of the metal gasket (22) is just suitable for It is provided to be in contact with the electromagnetic wave shielding copper foil (15) for electrical conduction, and the lower end of the metal gasket (22) is exposed at the bottom of the insulating casing (2).

The circuit substrate (3) is provided with a contact (31) corresponding to each of the pins (13) of the transformer (1), so that each of the pins (13) of the transformer (1) and the corresponding The contacts (31) are connected to each other and conduct, and the metal pad (22) corresponding to the insulating casing (2) is provided with a ground wire welding surface (32) on the circuit substrate (3), so that the metal pad (22) is connected to the ground. (22) The lower end can just be in contact with the welding surface (32) of the connecting ground wire and conduct electricity.

In this way, the present invention can be used in operation, so that in the process of the voltage conversion action of the transformer (1), if electromagnetic interference is generated, the generated electromagnetic interference can be generated by the electromagnetic wave of the iron core (11). The shielding copper foil (15) is conducted to the metal pad (22) of the insulating housing (2), and then conducted by the metal pad (22) via the connection surface (32) of the ground wire of the circuit substrate (3) The grounding can achieve the shielding of the electromagnetic interference generated by the transformer (1), so as to prevent the occurrence of the electromagnetic interference affecting the operation of the circuit.

In addition, please refer to FIG. 4, a schematic diagram of a three-dimensional exploded structure of another embodiment of the present invention, FIG. 5, a schematic diagram of a partial three-dimensional exploded structure of another embodiment of the present invention, and FIG. 6, a schematic diagram of a combined cross-sectional structure of another embodiment of the present invention. As shown, in the present invention, a metal pin (23) can also be protruded outwardly from the insulating shell (2), and the metal pin (23) and the accommodating space (21) of the insulating shell (2) The provided metal gasket (22) is electrically connected, and the circuit substrate (3) is formed with a hollow portion (33) corresponding to the insulating casing (2), and the circuit substrate (3) corresponds to the insulating casing (2) The metal pin (23) is provided with a ground connection welding point (34); so that when it is assembled, the transformer (1) is also accommodated in the accommodating space (21) of the insulating casing (2). Inside, the electromagnetic wave shielding copper foil (15) of the transformer (1) is in contact with the metal gasket (22) in electrical conduction, so that the insulating shell (2) corresponds to the hollow portion (33) of the circuit substrate (3) It is arranged that each of the pins (13) of the transformer (1) is connected to each of the contacts (31) corresponding to the circuit substrate (3), and the metal pins of the insulating shell (2) are connected and conducted. (23) It is connected to the ground connection welding point (34) on the circuit substrate (3) and conducts, so that the electromagnetic interference generated during the voltage conversion action of the transformer (1) can also be caused, The electromagnetic wave shielding copper foil (15) of the iron core (11) is conducted to the metal pad (22) of the insulating housing (2), and then via the metal pin electrically connected to the metal pad (22) (23) Grounding the connection ground wire welding point (34) conducted to the circuit substrate (3), so as to shield the electromagnetic interference generated by the transformer (1), so as to prevent electromagnetic interference from affecting the operation of the circuit. situation happens.

By the above, the use implementation description of the present invention shows that compared with the prior art means, the present invention mainly has the following advantages:

1. In the transformer of the present invention, an electromagnetic wave shielding copper wire is wound between the two coils of the coil set, so that it can avoid the application of copper foil as a common technical means, and the operation is time-consuming due to the miniaturization of the object during implementation. A labor-intensive situation occurs.

2. The present invention is not only faster in the overall assembly and setting, but also more simple and convenient, so as to effectively shield the electromagnetic interference generated by the transformer and prevent the occurrence of situations that affect the operation of the overall circuit. Its overall implementation and use are more practical and functional.

Claims (4)

1. The electromagnetic shielding structure of a kind of potential transformer, characterized by, mainly include potential transformer, insulating casing and circuit base plate; wherein:

the transformer is provided with a coil group in an iron core, a pin electrically connected with the coil extends outwards from the coil group, an insulating tape is wound on the outer edge of the iron core, and an electromagnetic wave shielding copper foil is wound outside the insulating tape;

the insulating shell is made of insulating materials, an accommodating space is formed in the insulating shell corresponding to the transformer so that the transformer can be accommodated in the accommodating space, a metal gasket is arranged at the bottom end of the accommodating space corresponding to the electromagnetic wave shielding copper foil of the transformer, the upper end of the metal gasket is in contact with the electromagnetic wave shielding copper foil for electric conduction, and the lower end of the metal gasket is exposed out of the bottom of the insulating shell;

the circuit substrate is provided with a contact corresponding to each pin of the transformer so as to connect and conduct each pin of the transformer with each corresponding contact, and the metal gasket corresponding to the insulating shell on the circuit substrate is provided with a connecting ground wire welding surface so as to enable the lower end of the metal gasket to be in contact with the connecting ground wire welding surface for electric conduction.

2. The electromagnetic shielding structure of a kind of potential transformer, characterized by, mainly include potential transformer, insulating casing and circuit base plate; wherein:

the transformer is provided with a coil group in an iron core, a pin electrically connected with the coil extends outwards from the coil group, an insulating tape is wound on the outer edge of the iron core, and an electromagnetic wave shielding copper foil is wound outside the insulating tape;

the insulating shell is made of insulating materials, an accommodating space is formed in the insulating shell corresponding to the transformer so that the transformer can be accommodated in the accommodating space, a metal gasket is arranged in the accommodating space corresponding to the electromagnetic wave shielding copper foil of the transformer, the metal gasket is in contact with the electromagnetic wave shielding copper foil and is electrically conducted, a metal pin is convexly arranged on the insulating shell in an outward extending mode, and the metal pin is electrically connected with the metal gasket;

the circuit substrate is provided with a hollow part for the corresponding assembly of the insulating shell, contacts are arranged on the circuit substrate corresponding to the pins of the transformer so as to enable the pins of the transformer to be connected and conducted with the corresponding contacts, and a ground wire welding point is arranged on the circuit substrate corresponding to the metal pins of the insulating shell so as to enable the metal pins to be connected and conducted with the ground wire welding point.

3. The electromagnetic shielding structure of transformer according to claim 1 or 2, wherein the coil assembly of the transformer is formed by winding a plurality of coils, and an electromagnetic wave shielding copper wire is wound between two of the coils.

4. The transformer of claim 3, wherein the coil assembly of the transformer has an insulating tape disposed between the outer edge of the coil assembly and the electromagnetic wave shielding copper wires.

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