TWI715920B - Electromagnetic shielding structure for transformer - Google Patents

Abstract

The invention relates to an electromagnetic shielding structure for a transformer. Primarily, a coil set of a transformer is provided with pins extended therefrom and connected with the coils. An outer edge of an iron core is wound with an insulating tape and then with an electromagnetic wave shielding copper foil. The transformer is received in an accommodation space of an insulating housing, and a metal gasket is provided at a bottom of the accommodation space corresponding to and electrically conducted with the electromagnetic wave shielding copper foil. Furthermore, each pin of the transformer is contacted and electrically conducted with a corresponding contact point of a circuit substrate, and the metal gasket is contacted and electrically conducted with a welding surface of ground connecting wires of the circuit substrate. Accordingly, not only can the whole assembly be more rapid, but also the stability of the whole assembly can be improved, and the service life of the product is further enhanced. Thereby the electromagnetic interference generated by the transformer can be shielded certainly to prevent the damage to the overall circuit operation, so as to increase the practicality and efficiency for the whole implementation.

Description

Electromagnetic shielding structure of transformer

The present invention relates to an electromagnetic shielding structure of a transformer, and in particular refers to an electromagnetic shielding structure that not only can be assembled more quickly in the overall assembly, but also can improve the stability of the overall assembly, and enhance the service life of the product, so as to achieve the The electromagnetic interference generated by the transformer is shielded to prevent the situation that affects the operation of the overall circuit, and it is more practical and effective in its overall implementation.

According to, many electronic products can be seen to be equipped with various transformers, which can be used for voltage conversion, circuit isolation and other actions. In the process of voltage conversion, the transformer is very easy to produce electromagnetic interference [Electromagnetic　Interference, EMI] , Especially under high-frequency use, the electromagnetic interference situation is more serious, causing electromagnetic radiation to affect the layout and electronic components around the circuit; therefore, in the transformer installation, the grounding is generally performed to introduce the interference signal to the ground Terminal to reduce electromagnetic interference.

Among them, please refer to the announcement No. M570565 "Flyback Power Conversion System" on November 21, 2018, which includes an electrically isolated transformer and a power conversion circuit arranged on the circuit board. The primary winding and secondary winding of the transformer 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 windings are located between the first and second shielding layers. The layer increases leakage inductance, thereby reducing electromagnetic interference during system operation. The increased leakage inductance provided by the shielding layer can still be installed in a package of specifications by increasing the size of the transformer, thereby increasing the size of the core And winding wire diameter to reduce copper loss, iron loss and temperature, so it can improve energy conversion efficiency. Wherein, an insulating tape is wound on the outer surface of the iron core group, and a copper foil layer is wound on 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 grounding wire to achieve the expected effect of reducing electromagnetic interference, it is also found in the actual assembly process because the iron core assembly needs to be wound on the outer surface. Insulating tape, and a copper foil layer is wound on the outer surface of the insulating tape, and then the ground wire end provided on one side of the copper foil layer is connected to the ground terminal of the circuit board, which is extremely labor-intensive not only in the connection and setting of the ground wire At times, and inadvertent force applied during the ground wire connection construction process can easily lead to breakage, which is even 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 upholds many years of rich experience in design, development and actual production in the related industry, and studies and improves the existing measurement methods and deficiencies to provide an electromagnetic shielding structure for transformers in order to achieve better practical value The purpose of sex.

The main purpose of the present invention is to provide an electromagnetic shielding structure for transformers, which not only can be faster in the overall assembly and installation, but also can improve the stability of the overall assembly, and enhance 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 overall circuit, and it is more practical and effective 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; among them:

In the transformer, a coil group is arranged in an iron core, and pins that are electrically connected to the coil extend outward from the coil group, and an insulating tape is wound around the outer edge of the iron core, and then the insulation Electromagnetic wave shielding copper foil is wound around the tape;

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

The circuit substrate is provided with a contact corresponding to each pin of the transformer, so that each pin of the transformer is connected to each corresponding contact point, and the circuit substrate corresponds to the insulating shell The metal gasket is provided with a ground wire welding surface, so that the lower end of the metal gasket and the ground wire welding surface are in contact and electrically conductive.

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

It mainly includes transformers, insulating casings and circuit substrates; among them:

In the transformer, a coil group is arranged in an iron core, and pins that are electrically connected to the coil extend outward from the coil group, and an insulating tape is wound around the outer edge of the iron core, and then the insulation Electromagnetic wave shielding copper foil is wound around the tape;

The insulating housing is made of insulating material, and an accommodating space corresponding to the transformer is formed in the insulating housing so that the transformer can be accommodated in the accommodating space, and the accommodating space corresponds to the electromagnetic wave of the transformer The shielding copper foil is provided with a metal gasket, the metal gasket is in contact with the electromagnetic wave shielding copper foil and electrically conductive, and a metal pin extends outward from the insulating shell, and the metal pin is electrically connected to the metal gasket. Sexual connection

The circuit substrate is formed with a hollow portion for the corresponding assembly of the insulating casing, and a contact is provided on the circuit substrate corresponding to each pin of the transformer, so that each pin of the transformer corresponds to each pin The contacts are connected and conducted, and the metal pins corresponding to the insulating shell on the circuit substrate are provided with ground connection solder points, so that the metal pins and the ground connection solder points are connected and conducted.

In a preferred embodiment of the electromagnetic shielding structure of the transformer of the present invention, the coil group of the transformer is composed of several coils, and an electromagnetic wave shielding copper wire is 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.

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

First of all, please refer to the first figure of the three-dimensional exploded structure diagram of the present invention, the second figure the partial three-dimensional exploded structure diagram of the present invention and the third figure the combined cross-sectional structure diagram of the present invention. The present invention mainly includes a transformer (1 ), insulating housing (2) and circuit board (3); among them:

The transformer (1) is provided with a coil group (12) in an iron core (11). The coil group (12) is composed of several coils (121), and is connected to two coils (121). An electromagnetic wave shielding copper wire (122) is wound therebetween, and an insulating tape (123) can be arranged on the outer edge of the coil assembly (12) and between the coil (121) and the electromagnetic wave shielding copper wire (122), In addition, a pin (13) electrically connected to the coil (121) extends 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 insulation An electromagnetic wave shielding copper foil (15) is wound around the tape (14).

The insulating housing (2) is made of insulating material, and an accommodating space (21) is formed in the insulating housing (2) corresponding to the transformer (1) so that the transformer (1) can be accommodated in the container In the housing space (21), a metal gasket (22) is provided at the bottom end of the housing 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 It can be contacted and electrically conducted with the electromagnetic wave shielding copper foil (15), and the lower end of the metal gasket (22) is exposed at the bottom of the insulating shell (2).

The circuit board (3) has a contact (31) corresponding to each pin (13) of the transformer (1), so that each pin (13) of the transformer (1) is The contact (31) is connected and conductive, and the metal pad (22) corresponding to the insulating shell (2) on the circuit board (3) is provided with a ground wire welding surface (32) to make the metal pad The lower end of the sheet (22) can be in contact with the ground wire welding surface (32) for electrical conduction.

In this way, the present invention is used in operation, which makes the transformer (1) in the process of voltage conversion action, if there is electromagnetic interference, the generated electromagnetic interference can be generated by the core (11) The electromagnetic wave shielding copper foil (15) is conducted to the metal gasket (22) of the insulating housing (2), and then the metal gasket (22) passes through the ground wire welding surface (32) of the circuit board (3) Conductive grounding can achieve shielding of electromagnetic interference generated by the transformer (1) to prevent electromagnetic interference from affecting circuit operation.

In addition, please refer to Figure 4, a schematic diagram of a three-dimensional exploded structure of another embodiment of the present invention, Figure 5, a schematic diagram of a partial three-dimensional exploded structure of another embodiment of the present invention, and Figure 6 a combined cross-sectional view of another embodiment of the present invention As shown in the structural schematic diagram, the present invention can also be provided with metal pins (23) protruding outward from the insulating shell (2), and the metal pins (23) and the accommodating space (2) of the insulating shell (2) The metal gasket (22) provided in 21) is electrically connected, and the circuit substrate (3) is formed with a hollow portion (33) corresponding to the insulating shell (2), and is correspondingly insulated on the circuit substrate (3) The metal pin (23) of the housing (2) is provided with a ground wire welding point (34); when it is assembled, the transformer (1) is also accommodated in the housing of the insulating housing (2) In the space (21), the electromagnetic wave shielding copper foil (15) of the transformer (1) is in contact with the metal gasket (22) and is electrically connected, so that the insulating housing (2) corresponds to the circuit board (3) The hollow part (33) is provided to connect each pin (13) of the transformer (1) with each contact point (31) corresponding to the circuit board (3), and make the insulating shell (2) The metal pin (23) is connected to the ground wire soldering point (34) on the circuit board (3), and the transformer (1) can also be generated during the voltage conversion action. The electromagnetic interference is conducted by the electromagnetic wave shielding copper foil (15) of the iron core (11) to the metal gasket (22) of the insulating housing (2), and then is electrically connected to the metal gasket (22) The metal pin (23) is conducted to the ground connection point (34) of the circuit board (3) for grounding, so as to shield the electromagnetic interference generated by the transformer (1) to prevent electromagnetic interference. The occurrence of interference that affects the operation of the circuit.

Based on the above, the description of the implementation of the present invention shows that, compared with the prior art, the present invention mainly has the following advantages:

1. The transformer of the present invention has electromagnetic wave shielding copper wire wound between the two coils of the coil group, so that it can avoid the copper foil sticking with conventional technical means, and the operation will be caused by the miniaturization of the object during construction. Time-consuming and labor-intensive situations occur.

2. The present invention is not only faster in the overall assembly and installation, but also more convenient and convenient, so as to actually shield the electromagnetic interference generated by the transformer and prevent the situation that affects the operation of the overall circuit. It is more practical and functional in its overall implementation.

However, the foregoing embodiments or drawings do not limit the product structure or usage mode of the present invention. Any appropriate changes or modifications by those with ordinary knowledge in the relevant technical field should be regarded as not departing from the patent scope of the present invention.

In summary, the embodiments of the present invention can indeed achieve the expected use effect, and the specific structure disclosed by it has not been seen in similar products, nor has it been disclosed before the application. It is in full compliance with the provisions of the patent law. In accordance with the requirements, Yan filed an application for a patent for invention in accordance with the law, asking for favors for examination, and granting a patent for approval, it would be so virtuous.

(1): Transformer

(11): Iron core

(12): Coil group

(121): Coil

(122): Electromagnetic wave shielded copper wire

(123): Insulating tape

(13): Pin

(14): Insulating tape

(15): Electromagnetic wave shielding copper foil

(2): Insulating shell

(21): Housing space

(22): Metal gasket

(23): Metal pin

(3): Circuit board

(31): Contact

(32): Connect the ground wire welding surface

(33): Hollowed part

(34): Connect the ground wire welding point

Figure 1: A schematic diagram of the three-dimensional exploded structure of the present invention

Figure 2: A schematic diagram of a partial three-dimensional exploded structure of the present invention

Figure 3: A schematic diagram of the combined sectional structure of the present invention

Figure 4: A schematic diagram of a three-dimensional exploded structure of another embodiment of the present invention

Figure 5: A partial three-dimensional exploded structure diagram of another embodiment of the present invention

Figure 6: A schematic cross-sectional structure view of another embodiment of the present invention

(1): Transformer

(11): Iron core

(12): Coil group

(13): Pin

(14): Insulating tape

(15): Electromagnetic wave shielding copper foil

(2): Insulating shell

(21): Housing space

(22): Metal gasket

(3): Circuit board

(31): Contact

(32): Connect the ground wire welding surface

Claims (4)

An electromagnetic shielding structure for a transformer, which mainly includes a transformer, an insulating casing and a circuit substrate; among them: In the transformer, a coil group is arranged in an iron core, and pins that are electrically connected to the coil extend outward from the coil group, and an insulating tape is wound around the outer edge of the iron core, and then the insulation Electromagnetic wave shielding copper foil is wound around the tape; The insulating housing is made of insulating material, and an accommodating space is formed in the insulating housing corresponding to the transformer so that the transformer can be accommodated in the accommodating space, and the bottom of the accommodating space corresponds to the transformer The electromagnetic wave shielding copper foil is provided with a metal gasket, the upper end of the metal gasket is for electrical conduction in contact with the electromagnetic wave shielding copper foil, and the lower end of the metal gasket is exposed at the bottom of the insulating shell; The circuit substrate is provided with a contact corresponding to each pin of the transformer, so that each pin of the transformer is connected to each corresponding contact point, and the circuit substrate corresponds to the insulating shell The metal gasket is provided with a ground wire welding surface, so that the lower end of the metal gasket and the ground wire welding surface are in contact and electrically conductive. An electromagnetic shielding structure for a transformer, which mainly includes a transformer, an insulating casing and a circuit substrate; among them: In the transformer, a coil group is arranged in an iron core, and pins that are electrically connected to the coil extend outward from the coil group, and an insulating tape is wound around the outer edge of the iron core, and then the insulation Electromagnetic wave shielding copper foil is wound around the tape; The insulating housing is made of insulating material, and an accommodating space corresponding to the transformer is formed in the insulating housing so that the transformer can be accommodated in the accommodating space, and the accommodating space corresponds to the electromagnetic wave of the transformer The shielding copper foil is provided with a metal gasket, the metal gasket is in contact with the electromagnetic wave shielding copper foil and electrically conductive, and a metal pin extends outward from the insulating shell, and the metal pin is electrically connected to the metal gasket. Sexual connection The circuit substrate is formed with a hollow portion for the corresponding assembly of the insulating casing, and a contact is provided on the circuit substrate corresponding to each pin of the transformer, so that each pin of the transformer corresponds to each pin The contacts are connected and conducted, and the metal pins corresponding to the insulating shell on the circuit substrate are provided with ground connection solder points, so that the metal pins and the ground connection solder points are connected and conducted. For example, the electromagnetic shielding structure of the transformer described in item 1 or 2 of the scope of patent application, wherein the coil group of the transformer is composed of several coils, and an electromagnetic wave shielding copper wire is wound between the two coils. For example, the electromagnetic shielding structure of the transformer described in item 3 of the scope of patent application, wherein the coil assembly of the transformer is provided with an insulating tape on the outer edge and between the coil and the electromagnetic wave shielding copper wire.

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