KR102620723B1 - Transformer with reduced electromagnetic wave radiation - Google Patents

Abstract

The present invention relates to a transformer configured to convert the value of alternating voltage or current using electromagnetic induction. According to the present invention, in order to minimize the generation and emission of electromagnetic waves generated during power conversion, an expensive switching element is used. In order to solve the problems of prior art transformers, which had problems of complicating the overall structure and increasing manufacturing costs due to the use of or additional shielding means to block electromagnetic waves, a printed circuit board (PCB) was used. It is designed to minimize the emission of electromagnetic waves due to switching noise by minimizing the radiation loop of electromagnetic waves by mounting active and passive elements such as switching elements on the lower part of the transformer installed in the transformer, thereby minimizing the emission of electromagnetic waves. Since there is no need to use parts or provide additional shielding means, the overall configuration can be simplified and the size and volume of parts can be reduced, thereby reducing manufacturing costs and improving productivity. A transformer is provided.

Description

Transformer with reduced electromagnetic wave radiation}

The present invention relates to a transformer configured to convert the value of alternating voltage or current using electromagnetic induction. More specifically, in order to minimize the generation and emission of electromagnetic waves generated during power conversion, an expensive switching element is required. In order to solve the problems of the prior art transformers, which had problems of complicating the overall structure and increasing manufacturing costs due to the use of additional shielding means to block electromagnetic waves, the structural improvement of the transformer was used to reduce switching noise. This relates to an electromagnetic emission reduction transformer configured to minimize the emission of electromagnetic waves.

In addition, the present invention solves the problems of prior art transformers, which had problems of complicating the overall structure and increasing manufacturing costs due to the use of expensive switching elements or the requirement of additional shielding means to minimize electromagnetic waves, as described above. To do this, active and passive elements such as switching elements are mounted on the bottom of the transformer installed on the printed circuit board (PCB) to minimize the radiation loop of electromagnetic waves, thereby minimizing the emission of electromagnetic waves due to switching noise. By being configured to minimize electromagnetic wave emissions, there is no need to use expensive parts or provide additional shielding means, thereby simplifying the overall configuration and reducing the size and volume of parts, thereby reducing manufacturing costs. It relates to an electromagnetic wave emission reduction transformer that is configured to improve productivity.

In general, a transformer wraps two or more coils around an iron core and converts the value of the input alternating voltage or current into a higher or lower value using the electromagnetic induction action between the primary and secondary coils. It is configured to output.

In addition, as mentioned above, the conventional transformer has a structure in which a primary coil and a secondary coil are each wound around an iron core and voltage is transformed by induced electromotive force, so the overall size is relatively large compared to other electronic components, and the shape and shape are different. There is a problem in that processing is not easy due to the difficulty in changing the shape.

In addition, conventional transformers have the disadvantage of high production costs because materials with good electrical conductivity, such as copper or copper, must be used. Accordingly, the disadvantages of existing transformers as described above have been improved and the structure and performance of the transformer have been improved. Research is being actively conducted to do so.

Here, examples of prior art for solving the disadvantages of the existing transformer as described above include, for example, a “transformer, including the transformer,” as presented in Korean Patent Publication No. 10-2020-0040588. There is a “power conversion device and a solar module equipped with the power conversion device.”

More specifically, the above-described Korean Patent Publication No. 10-2020-0040588 includes a core including a base and a plurality of protruding members that protrude on the base and are disposed within the outer wall; A plurality of bobbins each surrounding a plurality of protruding members and spaced apart from each other; A transformer and a power conversion device including the same, which are configured to include windings wound around a plurality of bobbins, so that the shape can be easily changed due to easy processing, thereby allowing the leakage inductance to be easily adjusted according to design specifications. and a solar module equipped with such a power conversion device.

Additionally, another example of the prior art for the above-mentioned transformer is, for example, a “transformer with a single core structure” as presented in Korean Patent Publication No. 10-1062389.

More specifically, the above-mentioned Korean Patent Publication No. 10-1062389 is a single Ginsim; Input winding wound on a single core; A first output winding wound on the upper part of a single core and wound in a staggered manner with the input winding; It includes a second output winding wound on the lower part of the single core and wound in a manner that is alternate with the input winding, wherein input power is applied to one end and the other end of the input winding, and one end of the first output winding and the other end of the second output winding. is connected to the positive terminal on the output side, and the other end of the first output winding and one end of the second output winding are combed together to form a combed wire, and the combed wire is connected to the negative terminal on the output side, thereby simplifying the structure and reducing the volume. It relates to a transformer with a single core structure that is configured to minimize.

As mentioned above, various devices and methods have been proposed to solve the shortcomings of existing transformers, but the contents of the prior art as described above have the following limitations.

That is, as described above, transformers are mainly used in power conversion circuits, and in the field of power conversion circuits, conventionally, transformers typically having the circuit structures of a flyback converter and a forward converter are widely used.

More specifically, conventionally, a transformer is generally treated as a single component consisting of a coil, core, bobbin, and lead. For example, in the case of a flyback converter, a switching element for varying the voltage of the primary coil It is configured to include a switching element for smoothing power on the secondary coil side, and power conversion is achieved by changing the voltage or current using this switching element.

Here, as described above, when power is converted by a switching element, switching noise is generated by each switching element of the primary circuit network and the secondary circuit network, and the switching noise generated in this way is radiation formed according to the component arrangement structure of the circuit board. It is radiated to the outside through a loop.

That is, in the conventional forward converter circuit structure, the remaining elements other than the transformer are generally disposed outside the transformer placed on the printed circuit board (PCB), and due to this arrangement structure, the radiation loop of electromagnetic wave noise is outside the transformer. It is formed towards the side, and electromagnetic waves are emitted to the outside as is.

Here, the influence of these electromagnetic waves may cause malfunctions or errors in other components or the overall system, so in order to prevent this, it is necessary to prevent the generation of electromagnetic waves in advance or block their emission to the outside.

Accordingly, conventional transformers are constructed by using expensive switching elements to minimize the generation and emission of electromagnetic waves, or by additionally arranging separate shielding means to block electromagnetic waves. Therefore, if expensive components or additional shielding methods are applied, the overall structure becomes more complicated and the volume increases, which increases the space occupied by the transformer in the total board area, which further increases manufacturing costs and reduces productivity. .

Therefore, as mentioned above, in order to solve the limitations of the prior art transformers, which had problems of complicating the overall structure and increasing manufacturing costs due to the need for expensive components or additional shielding means to minimize electromagnetic wave emissions, the structure of the transformer It would be desirable to propose a new electromagnetic emission reduction type transformer that can minimize electromagnetic emission with a simpler configuration and lower cost without the need to use expensive parts or additional shielding materials through practical improvement. However, such a transformer has not yet been implemented. Currently, no device or method that satisfies all requirements has been proposed.

Korean Patent Publication No. 10-2020-0040588 (2020.04.20.) Korean Patent Publication No. 10-1062389 (2011.08.30.)

The present invention seeks to solve the problems of the prior art as described above. Therefore, the purpose of the present invention is to minimize the generation and emission of electromagnetic waves generated during power conversion by using expensive switching devices or by blocking electromagnetic waves. In order to solve the problems of the prior art transformers, which had problems of complicating the overall structure and increasing manufacturing costs due to the need for additional shielding means, the emission of electromagnetic waves due to switching noise can be minimized through structural improvement of the transformer. The purpose is to present a transformer that reduces electromagnetic wave emissions.

In addition, another object of the present invention is to transform transformers of the prior art, which had problems of complicating the overall structure and increasing manufacturing costs due to the use of expensive switching elements or the need for additional shielding means to minimize electromagnetic waves, as described above. In order to solve the problem, active and passive elements such as switching elements are mounted on the lower part of the transformer installed on the PCB board to minimize the radiation loop of electromagnetic waves, thereby minimizing the emission of electromagnetic waves due to switching noise. Since there is no need to use expensive parts or provide additional shielding means to minimize electromagnetic wave emissions, the overall configuration can be simplified and the size and volume of parts can be reduced, thereby reducing manufacturing costs and improving productivity. The purpose is to present a transformer that reduces electromagnetic wave emission.

In order to achieve the above-described object, according to the present invention, there is provided an electromagnetic wave emission reduction transformer configured to minimize the emission of electromagnetic waves, comprising: a base substrate; Transformer modules each disposed on the base substrate; and an active element and a passive element respectively disposed on the base substrate for operation of the transformer module, wherein each of the active element and the passive element is arranged in a lower space inside the transformer module, An electromagnetic wave, characterized in that it is configured to minimize the formation of a radiation loop by forming a radiation loop due to the arrangement structure of each of the active elements and the passive element inside the transformer, thereby minimizing electromagnetic waves emitted to the outside. A reduced emission transformer is provided.

Here, the base board is made of a printed circuit board (PCB) that electrically connects each element, and further includes a board lead that serves as a terminal for mounting on a separate PCB board. It is characterized by

Additionally, the transformer module may include a core disposed on the base substrate; a coil wound around the core; a bobbin supporting the core on which the coil is wound; and a lead for electrical connection to the base substrate.

In addition, the active element includes: a first switching element consisting of a switching transistor (S) for controlling the operation of the primary coil side of the transformer module; And a second switching element made of a diode (D) for controlling the operation of the secondary coil side of the transformer module.

Moreover, the passive element is characterized by including a capacitor (C) for controlling the operation of the secondary coil side of the transformer module.

In addition, according to the present invention, a power conversion device is provided, characterized in that it includes the electromagnetic wave emission reduction type transformer described above.

In addition, according to the present invention, an electronic device is provided, characterized in that it includes the electromagnetic wave emission reduction type transformer described above.

As described above, according to the present invention, the emission of electromagnetic waves due to switching noise can be minimized by minimizing the radiation loop of electromagnetic waves by mounting active and passive elements such as switching elements on the lower part of the transformer installed on the PCB board. By providing an electromagnetic wave emission reduction transformer configured to minimize electromagnetic wave emission, there is no need to use expensive parts or provide additional shielding means, thereby simplifying the overall configuration and reducing the size and volume of parts. Thereby, manufacturing costs can be reduced and productivity can be improved.

In addition, according to the present invention, an electromagnetic wave emission reduction type transformer is provided that is configured to minimize the emission of electromagnetic waves due to switching noise through structural improvement of the transformer as described above, thereby generating and emitting electromagnetic waves generated during power conversion. In order to minimize the problem of using expensive switching elements or requiring additional shielding means to block electromagnetic waves, the problems of the prior art transformers, which had problems of complicating the overall structure and increasing manufacturing costs, can be solved.

Figure 1 is a diagram schematically showing the circuit structure of a flyback converter as an example of a transformer of the prior art.
FIG. 2 is a side view schematically showing the flyback converter circuit shown in FIG. 1 mounted on a PCB board.
FIG. 3 is a plan view schematically showing the flyback converter circuit shown in FIG. 1 mounted on a PCB board.
FIG. 4 is a diagram showing an electromagnetic wave radiation loop of the circuit of the flyback converter shown in FIG. 1.
FIG. 5 is a diagram showing an electromagnetic wave radiation loop of the flyback converter circuit shown in FIG. 3.
Figure 6 is a diagram schematically showing the overall configuration of an electromagnetic wave emission reduction type transformer according to an embodiment of the present invention.
Figure 7 is a plan view schematically showing a state in which the electromagnetic wave emission reduction type transformer according to the embodiment of the present invention shown in Figure 6 is mounted on a PCB board.
FIG. 8 is a plan view schematically showing the state in which active elements and passive elements are arranged under the transformer and mounted on a PCB board in the plan view shown in FIG. 7.
Figure 9 is a circuit diagram schematically showing the circuit structure of the electromagnetic wave emission reduction type transformer according to the embodiment of the present invention shown in Figure 6.

Hereinafter, with reference to the attached drawings, specific embodiments of the electromagnetic wave emission reduction type transformer according to the present invention will be described.

Here, it should be noted that the content described below is only one embodiment for carrying out the present invention, and the present invention is not limited to the content of the embodiment described below.

In addition, in the description of the embodiments of the present invention below, parts that are the same or similar to the contents of the prior art or that are judged to be easily understood and implemented at the level of those skilled in the art will be described in detail to simplify the explanation. It should be noted that was omitted.

That is, as will be described later, the present invention requires the use of expensive switching elements or additional shielding means to block electromagnetic waves in order to minimize the generation and emission of electromagnetic waves generated during power conversion, making the overall structure complicated and manufacturing complicated. In order to solve the problems of the prior art transformers, which had the problem of increasing cost, the present invention relates to an electromagnetic wave emission reduction type transformer that is configured to minimize the emission of electromagnetic waves due to switching noise through structural improvement of the transformer.

In addition, as will be described later, the present invention solves the problems of prior art transformers, which had problems of complicating the overall structure and increasing manufacturing costs due to the use of expensive switching elements or the need for additional shielding means to minimize electromagnetic waves. In order to solve this problem, active and passive elements such as switching elements are mounted on the lower part of the transformer installed on the PCB board to minimize the radiation loop of electromagnetic waves, thereby minimizing the emission of electromagnetic waves due to switching noise. Since there is no need to use expensive parts or provide additional shielding means to minimize emissions, the overall configuration can be simplified and the size and volume of parts can be reduced, thereby reducing manufacturing costs and improving productivity. It relates to an electromagnetic wave emission reduction transformer.

Continuing, with reference to the drawings, specific details of the electromagnetic wave emission reduction type transformer according to the present invention will be described.

First, referring to FIG. 1, FIG. 1 is a diagram schematically showing the circuit structure of a flyback converter as an example of a conventional transformer.

As shown in Figure 1, the circuit of the flyback converter of the prior art is roughly divided into a transformer including a primary coil (N1), a secondary coil (N2), and an inductor (L _M ), and a primary coil ( It is composed of a switching element (S) installed on the N1) side, a diode (D), a capacitor (C), and a resistor (Ro) installed on the secondary coil (N2) side.

More specifically, referring to FIGS. 2 and 3, FIGS. 2 and 3 are diagrams schematically showing the overall configuration of a prior art transformer, respectively. FIG. 2 shows the flyback converter circuit shown in FIG. 1 on a PCB board. It is a side view schematically showing the mounted state, and Figure 3 is a plan view thereof.

As shown in Figures 2 and 3, the transformer is generally treated as a single component consisting of a coil, core, bobbin, and lead, and, for example, in the case of a flyback converter, is used to vary the voltage of the primary coil. A switching element (S) for power generation, a switching element (D) for smoothing power on the secondary coil side, and a passive element (C) are arranged on both sides of the transformer on the PCB board.

Through this configuration, the existing transformer converts power by changing the voltage or current using each switching element, and at this time, the primary circuit network including the switching element (S) and the switching element (D) Electrical switching noise is generated by each switching element of the secondary network including.

Here, as shown in Figure 2, a radiation loop is formed on both sides of the transformer due to the arrangement structure in which the switching elements (S, D) are respectively disposed on both sides of the transformer, and through this radiation loop, electromagnetic waves generated from the transformer are transmitted to the outside. is emitted as

That is, referring to FIGS. 4 and 5, FIG. 4 is a diagram showing the electromagnetic wave radiation loop of the flyback converter circuit shown in FIG. 1, and FIG. 5 is a diagram showing the electromagnetic wave radiation loop of the flyback converter circuit shown in FIG. 3, respectively. It is a drawing.

As shown in Figures 4 and 5, the existing transformer structure is a structure in which each element (S, D, C) is arranged outside the transformer on the PCB board, so it has a radiating loop structure formed outside the transformer, As a result, there was a disadvantage that a separate shielding means was required to prevent the leakage of electromagnetic waves.

Accordingly, in the present invention, as will be described later, each element (S, D, C) is placed inside the transformer on the PCB board to form a relatively small radiation loop below the transformer, resulting in a significant improvement in electromagnetic wave radiation. proposed a new transformer structure with .

More specifically, referring to FIG. 6, FIG. 6 is a block diagram schematically showing the overall configuration of the electromagnetic wave emission reduction transformer 10 according to an embodiment of the present invention.

As shown in FIG. 6, the electromagnetic wave emission reduction transformer 10 according to an embodiment of the present invention includes a coil 12, a bobbin 13, a core 14, and a lead 15 on a base substrate 11. It is similar to the transformer of the prior art in that it has an arranged structure.

However, as shown in FIG. 6, the electromagnetic wave emission reduction transformer 10 according to an embodiment of the present invention includes each of the switching elements (S, D) (16, 17) and the passive element (C) (18). The difference is that the parts are installed in the lower space inside the transformer.

That is, referring to FIGS. 7 and 8, FIG. 7 is a plan view schematically showing the state in which the electromagnetic wave emission reduction type transformer according to the embodiment of the present invention shown in FIG. 6 is mounted on a PCB board, and FIG. This is a plan view schematically showing the state in which active and passive elements are placed under the transformer and mounted on the PCB board.

In addition, referring to FIG. 9, FIG. 9 is a circuit diagram schematically showing the circuit structure of the electromagnetic wave emission reduction type transformer 10 according to an embodiment of the present invention shown in FIG. 6.

In Figure 9, the inner square (blue) mark represents the transformer portion, and the outer square (red) mark represents the area of the electromagnetic wave emission reduction type transformer 10 according to the embodiment of the present invention.

Therefore, as shown in FIGS. 6 to 9, the radiation loop can be minimized as shown in FIG. 6 by arranging each element below the transformer, and thereby, various elements are arranged on both sides of the transformer to provide radiation to both sides of the transformer. Unlike the structure of existing transformers in which a relatively large radiation loop is formed, electromagnetic waves emitted outside the transformer can be minimized.

Here, the base board is a PCB board that electrically connects each element, and as shown in FIG. 6, it can be configured to have board leads 19 that serve as terminals so that they can be mounted on the PCB board.

From the above-mentioned configuration, according to the present invention, additional shielding means or expensive switching elements are provided to prevent electromagnetic wave emission by minimizing the radiation loop by arranging each element (S, D, C) inside the transformer. Since there is no need to use a PCB and the used PCB area can be reduced, the overall manufacturing cost of the transformer can be reduced. In addition, it can be connected to another board or other board through the plurality of board leads 19 formed on the side of the base board 11. It has the advantage of being able to connect to devices or devices more easily.

Here, in the embodiment of the present invention described above, more detailed information on the specific configuration and operation of a transformer such as a flyback converter is apparent to those skilled in the art by referring to the information on the transformer of the prior art. It should be noted that in the invention, in order to simplify the explanation, detailed description of content that can be easily understood and implemented by a person skilled in the art with reference to prior art literature, etc., has been omitted as described above.

Therefore, as described above, it is possible to implement an electromagnetic wave emission reduction type transformer according to an embodiment of the present invention, and thereby, according to the present invention, active and passive elements such as switching elements are installed at the bottom of the transformer installed on the PCB board, respectively. An electromagnetic wave emission reduction transformer is provided that is designed to minimize the emission of electromagnetic waves due to switching noise by minimizing the radiation loop of electromagnetic waves by mounting it. In order to minimize electromagnetic wave emission, the use of expensive parts or additional shielding means is provided. Since there is no need to provide it, the overall configuration can be simplified and the size and volume of parts can be reduced, thereby reducing manufacturing costs and improving productivity.

In addition, according to the present invention, an electromagnetic wave emission reduction type transformer is provided that is configured to minimize the emission of electromagnetic waves due to switching noise through structural improvement of the transformer as described above, thereby generating and emitting electromagnetic waves generated during power conversion. In order to minimize the problem of using expensive switching elements or requiring additional shielding means to block electromagnetic waves, the problems of the prior art transformers, which had problems of complicating the overall structure and increasing manufacturing costs, can be solved.

Above, the details of the electromagnetic wave emission reduction type transformer according to the present invention have been described through the embodiments of the present invention as described above, but the present invention is not limited to the contents described in the above embodiments, and therefore the present invention It is natural that various modifications, changes, combinations, and substitutions can be made by those skilled in the art to which the present invention pertains, depending on design needs and various other factors.

10. Electromagnetic wave emission reduction transformer
11. Base board 12. Coil
13. Bobbin 14. Core
15. Lead 16. Switching element (S)
17. Switching element (D) 18. Passive element (C)
19. Board lead

Claims (7)

In the electromagnetic wave emission reduction transformer configured to minimize the emission of electromagnetic waves due to switching noise,
A printed circuit board (PCB) that electrically connects each element, and a plurality of board leads formed at predetermined positions on the side of the PCB board as terminals for mounting on a separate PCB board other than the PCB board. A base substrate comprising:
A core disposed on the base substrate, a coil wound around the core, a bobbin supporting the core around which the coil is wound, and a lead for electrical connection to the base substrate, each disposed on the base substrate. Transformer module;
A first switching element consisting of a switching transistor (S) for controlling the operation of the primary coil side of the transformer module, and a second switching element consisting of a diode (D) for controlling the operation of the secondary coil side of the transformer module. Active elements each disposed on the base substrate, including; and
It is configured to include a passive element including a capacitor (C) for controlling the operation of the secondary coil side of the transformer module,
As each of the active elements and the passive elements are disposed in the lower space inside the transformer module, a radiation loop is formed inside the transformer by the arrangement structure of each of the active elements and the passive elements, thereby forming a radiation loop. By minimizing the formation, electromagnetic waves emitted to the outside can be minimized without the need for additional shielding means.
An electromagnetic wave emission reduction type transformer, characterized in that it can be easily connected to other boards, devices, or devices through each of the board leads.
delete delete delete delete A power conversion device comprising the electromagnetic wave emission reduction transformer according to claim 1.
An electronic device comprising the electromagnetic wave emission reduction transformer according to claim 1.