KR102201782B1 - Line filter and EMI filter to which it is applied - Google Patents

Abstract

The present invention discloses a line filter and an EMI filter applied to thereof. The present invention constitutes a single line filter replacing a plurality of line filters and an EMI filter applied to thereof, wherein accordingly, the arrangement of capacitors can be freely set so that position adjustment according to the board (PCB) and circuit configuration can be easily made, and securing electrical characteristics (for example, inductance, impedance) for blocking noise (electromagnetic waves) through circuit design as needed. When designing an EMI filter, it is possible to achieve miniaturization, thinning, and high efficiency for various electronic devices having a power board while reducing the number of components mounted on the PCB.

Description

Line filter and EMI filter to which it is applied}

The present invention relates to a line filter used in a power board in various electronic devices and an EMI filter (Electro Magnetic Interference Filter) to which the same is applied.

In general, an EMI filter passes signals required for operation and removes noise.It is installed at the power input terminal of an electronic device and blocks, absorbs, or bypasses unnecessary electromagnetic waves emitted from the electronic device and exiting through the power line. bypass), which is used to satisfy the electromagnetic wave certification standard that various electronic devices must proceed.

The EMI filter 100 is configured by combining a plurality of line filters (LF1, LF2) and a capacitor (CAPACITOR; CX1, CX2, CY1, CY2), as shown in FIG. 1, which is a plurality of Capacitors CX1, CX2, CY1, and CY2 are positioned between the formed line filters LF1 and LF2.

At this time, the line filters LF1 and LF2 are not shown in the drawings, respectively, but a toroidal magnetic core, a first coil wound on the magnetic core, and symmetrically wound on the magnetic core with the first coil. A second coil, and a shielding portion disposed on the first coil and the second coil, and the shielding portion may include a magnetic material.

In addition, the magnetic core may include a separation wall disposed between the first coil and the second coil, and the separation wall is configured to block electrical contact between the first coil and the second coil.

However, the EMI filter 100 to which the plurality of line filters LF1 and LF2 are applied as described above is the line filter LF1 and LF2 formed of a plurality for the arrangement of the capacitors CX1, CX2, CY1, and CY2. A sufficient separation distance must be secured, and in this case, as the distance between the line filters (LF1, LF2) decreases, it inevitably occupies a lot of space. When the filter 100 is applied to various electronic devices, there is a problem that it is difficult to reduce the size, thin film, and high efficiency of the electronic device.

In addition, since the conventional EMI filter 100 as described above is limitedly disposed between the line filters L1 and L2 having a plurality of positions of the capacitors CX1, CX2, CY1, CY2 during circuit design, the substrate There are many difficulties in configuring the circuit according to the size of the (PCB), and as the EMI filter 100 is divided into several parts as needed, there is considerable difficulty in securing price competitiveness, as well as the existing EMI filter according to the noise (electromagnetic wave) test result It is difficult to change 100 or to newly design the EMI filter 100.

On the other hand, when applying a plurality of line filters (LF1, LF2) to the conventional EMI filter 100 as described above, the same components constituting each line filter (LF1, LF2) are inevitably included, so the EMI filter 100 Not only is the number of components for the component increased, but also the number of components mounted on the substrate (PCB) increases, and this can also act as a factor that makes it difficult to reduce the size, thin film, and high efficiency when configuring the EMI filter 100. There was only one.

Registered Patent Publication No. 10-1598259 (announcement date 2016.02.26.) Unexamined Patent Publication No. 10-2018-0071826 (Publication date 2018.06.28.) Unexamined Patent Publication No. 10-2018-0093635 (published on August 22, 2018) Unexamined Patent Publication No. 10-2019-0033717 (published on April 1, 2019) Unexamined Patent Publication No. 10-2019-0081399 (published on July 9, 2019)

An object to be solved by the present invention is to provide a line filter capable of reducing the number of components mounted on a substrate (PCB) by configuring one line filter that can replace a plurality of line filters.

Another problem to be solved by the present invention is to configure an EMI filter to which one line filter replacing a plurality of line filters is applied, so that the arrangement of the capacitors can be freely set and the position adjustment according to the substrate (PCB) and circuit configuration is possible. While making it easy to achieve, electrical characteristics (e.g., inductance, impedance) to block noise (electromagnetic waves) are secured through circuit design as needed, and through this, various electronic devices with power boards can be miniaturized, thinned, and highly efficient. It is intended to provide an EMI filter that enables it.

The line filter, which is a means of solving the problems of the present invention, includes a filter body having an annular or angular seating groove with an open one side; An annular or angular magnetic core to which a coil is wound by being seated in the seating groove; And an annular or angular cover body coupled to an open surface of the filter body, forming a stacked structure with the magnetic core, and winding the coil. And a first separating member protruding through the magnetic core and the cover member in the seating groove to separate the winding regions of the coil into at least a plurality of pieces, and the first separating member in the cover member A second separator is protruded to form at least a plurality of winding regions of the coil together with the separator.

In addition, in the filter body, a plurality of inlets and a plurality of outlets are formed for inlet and outlet of the coils that are separately wound in the winding region that is multiplely separated by at least a plurality of pieces by the first and second separators. It becomes.

In addition, the inlet includes first to fourth inlets, the outlet includes first to fourth outlets, and the winding region includes: a first winding region in which the first inlet and the first outlet are disposed; A second winding region in which the second inlet and the second outlet are disposed; A third winding region in which the third inlet and the third outlet are disposed; And a fourth winding region disposed between the fourth inlet and the fourth outlet. It includes.

In addition, the line filter is wound in the first winding region and in the second winding region so as to have the same or higher electrical characteristics as a plurality of line filters. 2 The lead end of the coil drawn into the inlet, the lead end of the coil wound around the third winding region and drawn out to the third outlet, and the lead end of the coil drawn into the fourth inlet so that it is wound around the fourth winding region. It is to short each.

In addition, at least a plurality of fixing protrusions for fixing and supporting the magnetic core and the cover body, which are seated while forming a stacked structure in the mounting groove, are formed on the inner circumferential surface of the filter body.

In addition, the first separator protrudes from a central portion of the seating groove to an opened surface of the filter body, and includes first to fourth partition walls forming a cross-shaped structure, and the first to fourth partition walls At the end, each coupling protrusion is protruding.

In addition, the second separator includes fifth to eighth separation walls each protruding inward from the upper surface of the cover body, and the coupling protrusions are respectively fitted to ends of the fifth to eighth separation walls. The coupling groove is formed.

In addition, the filter body is provided with a capacitor connection terminal having a connection portion to which at least a plurality of capacitors are respectively connected.

In addition, when configuring an EMI filter by mounting the line filter on a substrate, at least a plurality of capacitors are disposed at an arbitrary location around the line filter mounted on the substrate and then connected to the line filter.

As described above, the present invention constitutes one line filter replacing a plurality of line filters and an EMI filter using the same, and through this, the arrangement of the capacitors is freely set to adjust the position according to the substrate (PCB) and circuit configuration. While making this easy to achieve, electrical characteristics (e.g., inductance, impedance) to block noise (electromagnetic waves) are secured through circuit design as needed, and the number of parts mounted on the PCB when designing an EMI filter is reduced. It is possible to expect the effect of achieving miniaturization, thinning, and high efficiency of various electronic devices having power boards.

The effects of the present invention are not limited to the effects mentioned above, and other effects that are not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a schematic circuit diagram of an EMI filter to which a plurality of conventional line filters are applied.
2 is an exploded perspective view showing a single line filter structure designed to implement a plurality of line filter functions according to an embodiment of the present invention.
Figure 3 is a perspective view of the combination of Figure 2 as an embodiment of the present invention.
Figure 4 is a plan view of Figure 3 in an embodiment of the present invention.
Figure 5 is a bottom view of Figure 3 in an embodiment of the present invention.
6 is a schematic plan view showing the wiring state of the inlet side and the outlet side of a coil wound in a plurality of winding regions provided in one line filter according to an embodiment of the present invention.
7 is a schematic plan view showing a state in which a capacitor is connected to one line filter having multiple coil winding regions to configure an EMI filter according to an embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, in the embodiments of the technical idea of the present invention, it is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only this embodiment makes the disclosure of the present invention complete, and the technology to which the present invention pertains. It is provided to completely inform the scope of the invention to those of ordinary skill in the field, and is only defined by the scope of the claims in the embodiments of the inventive concept.

The terms used in the present specification are for describing exemplary embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless specifically stated in the phrase.

In the present specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance the possibility of being added.

In addition, embodiments described in the present specification will be described with reference to cross-sectional views and/or plan views, which are ideal exemplary views of the present invention. Accordingly, embodiments of the present invention are not limited to the specific form shown, but also include changes in necessary form. For example, the area shown at right angles may be rounded or may have a shape having a predetermined curvature. Accordingly, the regions illustrated in the drawings have schematic properties, and the shapes of the regions illustrated in the drawings are for illustrating a specific shape of the region of the device and are not intended to limit the scope of the invention.

The same reference numerals refer to the same elements throughout the specification. Accordingly, the same reference numerals or similar reference numerals may be described with reference to other drawings, even if they are not mentioned or described in the corresponding drawings. Further, even if a reference numeral is not indicated, it may be described with reference to other drawings.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is an exploded perspective view showing a single line filter structure designed to implement a plurality of line filter functions according to an embodiment of the present invention, and FIG. 3 is a combined perspective view of FIG. 2 as an embodiment of the present invention, and FIG. 3 is a plan view of FIG. 3 according to an exemplary embodiment of the present invention, FIG. 5 is a bottom view of FIG. 3 according to an exemplary embodiment of the present invention, and FIG. 6 is a multiple winding region provided in one line filter according to an exemplary embodiment of the present invention. It is a schematic plan view showing the wiring state of the lead-in side and the lead-out side of the coil wound on.

Referring to the accompanying Figures 2 to 6, the line filter (LF10) according to an embodiment of the present invention, the filter body 10, the magnetic core 20, the cover body 30, and the coils (L1, L2, It includes N1, N2).

The filter body 10 is an annular (eg, elliptical or circular) or rectangular (eg, square) mounting groove (eg, a square) with an open surface so that the magnetic core 20 and the cover body 30 can be stacked and seated. 10a) is formed, and when the coils L1, L2, N1, and N2 are wound in a winding region that is multiplely separated by at least a plurality of the first and second separators 40 and 50, the coil ( 1st to 4th inlets (a1, a2, a3, a4) and 1st to 4th outlets (b1, b2, b3, b4) are formed for multiple entry and multiple withdrawal of L1, L2, N1, N2) It can be.

Here, the winding region includes a first winding region S1 in which the first inlet a1 and the first outlet b1 are disposed, the second inlet a2 and the second outlet b2 The second winding region S2, the third winding region S3 in which the third inlet a3 and the third outlet b3 are arranged, and the fourth inlet a4 and the fourth outlet b4 ) May include a fourth winding region S4 disposed thereon.

At this time, a fixing protrusion 11 for fixing and supporting the magnetic core 20 and the cover body 30, which are mounted in a stacked structure in the mounting groove 10a, respectively, on the front and rear and left and right sides of the inner circumferential surface of the filter body 10. ) Has a connection part 12a so that at least a plurality of capacitors (CX1, CX2, CY1, CY2) can be connected to each other for the configuration of the EMI filter 200 as in FIGS. 5 and 7 A capacitor connection terminal 12 may be formed.

The magnetic core 20 is an annular (eg, elliptical or circular) or rectangular (eg, rectangular) structure that forms a stacked structure with the cover body 30 and is seated in the mounting groove 10a, and forms a stacked structure. Together with the cover body 30, the coils L1, L2, N1, and N2 may be separately wound.

The cover body 30 is coupled to the open surface of the filter body 10 and covers the opened surface, and forms a stacked structure with the magnetic core 20, and the coils L1, L2, N1, and N2 are It is an annular (eg, oval or circular) or rectangular (eg, square) structure that is wound.

The first separating body 40 is formed to protrude from the center of the mounting groove 10a so as to penetrate the magnetic core 20 and the cover body 30, and the coils L1, L2, N1, and N2 The first to fourth winding regions S1, S2, S3, and S4 are multiplely separated so as to be wound separately.

That is, the first separating body 40 protrudes from the central portion of the seating groove 10a to the opened surface of the filter body 10, which is the first to fourth separating walls 41 forming a cross-shaped structure. 42, 43, 44), and each of the first to fourth separation walls 41, 42, 43, 44 may have coupling protrusions 45 protruding from ends thereof.

Accordingly, when the magnetic core 20 and the cover body 30 form a stacked structure and are seated in the seating groove 10a, the coils L1, L2, N1, and N2 wound on the magnetic core 20 side Is capable of maintaining a separate winding structure in which mutual contact is prevented by the first to fourth separation walls 41, 42, 43, 44 each forming a cross-shaped structure.

The second separator 50 protrudes from the upper surface of the cover body 30 in an inward direction and is coupled to the first separator 40, which is combined with the first separator 40. The first to fourth winding regions S1, S2, S3, and S4 are multiplely separated so that the coils L1, L2, N1, and N2 are wound separately.

That is, the second separator 50 includes fifth to eighth separation walls 51, 52, 53, and 54 each protruding inwardly from the upper surface of the cover body 30, and the fifth to A coupling groove 55 into which the coupling protrusion 45 is fitted may be formed at the ends of the eighth separation walls 51, 52, 53, and 54, respectively.

Therefore, when the magnetic core 20 and the cover body 30 form a stacked structure and are seated in the seating groove 10a, the coils (L1, L2, N1, N2) wound on the cover body 30 side Is prevented from being mutually contacted by the fifth to eighth partition walls 51, 52, 53, 54 coupled to the first to fourth partition walls 41, 42, 43, 44, respectively forming a cross-shaped structure. It is possible to maintain a separate winding structure.

At this time, the first coil L1 is wound in the first winding area S1, the second coil L2 is wound in the second winding area S2, and the third winding area S3 is 3 The coil N1 is wound, and the fourth coil N2 is wound in the fourth winding area S4, and the first winding area S1 is wound as shown in FIG. Short the lead end of the first coil L1 drawn out through the first outlet b1 and the lead end of the second coil L2 drawn into the second inlet a2 so that it is wound around the second winding region S2. (short), the fourth inlet so that it is wound in the third winding region S3 and wound around the lead end of the third coil N1 and the fourth winding region S4, which is drawn through the third outlet b3. When the lead end of the fourth coil N2 drawn into (a4) is shorted, electrical characteristics equal to or higher than those of the line filters LF1 and LF2 made of a plurality as shown in FIG. 1 (e.g., reactance, impedance) One line filter (LF10) having a can be made.

As described above, the line filter LF10 according to an embodiment of the present invention has a cover body (eg, an oval or circular) or a rectangular (eg, a quadrangle) structure as shown in FIGS. 2 to 6. After stacking the magnetic core 20 on the bottom side of 30), the fifth to eighth separation walls 51, 52, 53, 54 of the second separation body 50 formed on the upper surface of the cover body 30 The first to fourth coils L1, L2, N1, and N2 are wound independently in the first to fourth winding regions S1, S2, S3, and S4 separated by) as a boundary.

That is, the first coil L1 is wound around the magnetic core 20 and the cover body 30 forming a stacked structure in the first winding region S1, and the stacked structure in the second winding region S2. The second coil (L2) is wound on the magnetic core 20 and the cover body 30, and the magnetic core 20 and the cover body 30 forming a stacked structure in the third winding region S3 The third coil N1 is wound, and the fourth coil N2 is wound around the magnetic core 20 and the cover body 30 forming a stacked structure in the fourth winding region S4.

Then, from the cover body 30 side, the first to fourth winding regions S1 and S2 by the fifth to eighth separation walls 51, 52, 53, 54 included in the second separator 50 , The first to fourth coils L1, L2, N1, and N2 wound on each of S3 and S4 maintain a separate winding structure that prevents mutual contact, and the first to fourth coils wound on the magnetic core 20 The first to fourth coils L1, L2, N1, and N2 do not maintain a separate winding structure in which mutual contact is prevented.

Accordingly, the magnetic core 20 and the cover body 30 forming a stacked structure in which the first to fourth coils L1, L2, N1, N2 are wound are inserted into the seating groove 10a of the filter body 10. Settles in.

Then, the coupling protrusion 45 formed at the ends of the first to fourth separation walls 41, 42, 43, 44 forming the first separation body 40 protruding from the central portion of the mounting groove 10a Is fitted into the coupling groove 55 formed at the ends of the fifth to eighth partition walls 51, 52, 53, 54 forming the second separator 50, and the first to fourth winding regions The first to fourth coils (L1, L2, N1, N2) wound on the magnetic core 20 side in (S1, S2, S3, S4) form a coupling structure with the second separator 50. It is possible to maintain a separate winding structure in which mutual contact is prevented by the first separating body 40 that is formed.

Next, the inlet end of the first coil L1 wound in the first winding region S1 is disposed in the first inlet a1 formed in the filter body 10 to connect the terminal, and the first coil The withdrawal end of (L1) is placed in the first outlet (b1) formed in the filter body (10).

In addition, the lead-in end of the second coil L2 wound in the second winding region S2 is disposed at the second inlet a2 formed in the filter body 10, and the second coil L2 The lead-out end is disposed in the second outlet (b2) formed in the filter body 10 and is connected to the terminal.

In addition, the inlet end of the third coil N1 wound in the third winding region S3 is disposed in a third inlet a3 formed in the filter body 10 to connect a terminal, and the third coil ( The withdrawal end of N1) is placed in the third outlet (b3) formed in the filter body 10.

In addition, the lead end of the fourth coil N2 wound in the fourth winding region S4 is disposed at a fourth inlet a4 formed in the filter body 10, and the fourth coil N2 The lead end is disposed in the fourth outlet (b4) formed in the filter body 10 and connected to the terminal.

Thereafter, the first coil (L1) is wound around the first winding region (S1) and is drawn out through the first outlet (b1) and the second winding region (S2) is wound around the second inlet (a2). While shorting the lead-in end of the second coil L2, the lead-out end of the third coil N1 and the fourth lead-out end of the third coil N1, which is wound in the third winding region S3 and drawn out through the third outlet b3, are When the lead end of the fourth coil N2, which is wound in the winding region S4 and disposed through the fourth inlet a4, is shorted, it is the same as the conventional line filters LF1 and LF2 composed of a plurality of lines as shown in FIG. Or, one line filter LF10 applicable to the EMI filter 200 to be described later as having high electrical characteristics (eg, reactance, impedance) may be completed.

That is, as shown in FIG. 7, the EMI filter 200 according to an embodiment of the present invention includes one line filter LF10 and a plurality of capacitors CX1, which are described in FIGS. 2 to 6. It can be configured by connecting CX2, CY1, CY2).

At this time, when configuring the EMI filter 200 by mounting the one line filter LF10 on a substrate (PCB, not shown), at least a plurality of at least a plurality of locations around the line filter LF10 mounted on the substrate The capacitors CX1, CX2, CY1, and CY2 are freely disposed and then connected to the line filter LF10.

That is, since at least a plurality of capacitor connection terminals 12 having a connection portion 12a are formed on the filter body 10 included in the line filter LF10, as shown in FIG. 5, the capacitor connection terminal ( The capacitors CX1, CX2, CY1 and CY2 are respectively connected to the connection part 12a of 12).

At this time, the capacitors CX1, CX2, CY1, CY2 may be freely disposed around the line filter LF10 in the substrate by applying one line filter LF10, and accordingly, the EMI filter 200 and , As it is possible to optimize the size of the substrate, as well as miniaturization and thinning, it is possible to secure a price aspect or quality competitiveness when the EMI filter 200 is applied to a power board of an electronic device.

In the above, the technical idea of the line filter of the present invention and the EMI filter to which it is applied has been described with the accompanying drawings, but this is an exemplary description of the most preferred embodiment of the present invention, but does not limit the present invention.

Therefore, the present invention is not limited to the specific preferred embodiments described above, and anyone with ordinary knowledge in the technical field to which the present invention pertains without departing from the gist of the present invention claimed in the claims can implement various modifications. Of course, such changes are possible and are within the scope of the description of the claims.

10; Filter body 10a; Seating groove
11; Fixed projection 12; Capacitor connection
12a; Connection part 20; Magnetic core
30; Cover body 40; First separator
41, 42, 43, 44; 1st, 2nd, 3rd, 4th partition wall
45; Coupling protrusion
50; Second separator 51, 52, 53, 64; 5th,6th,7th,8th dividing wall
55; Coupling groove 200; EMI filter
LF10; Line filters L1, L2, N1, N2; coil
S1, S2, S3, S4; Winding regions a1, a2, a3, a4; Entrance
b1, b2, b3, b4; Outlets CX1, CX2, CY1, CY2; Capacitor

Claims (9)

A filter body having an annular or angular seating groove and an open one side thereof; An annular or angular magnetic core to which a coil is wound to be seated in the seating groove; And an annular or angular cover body coupled to an open surface of the filter body, forming a stacked structure with the magnetic core, and winding the coil. Including,
In the seating groove, a first separating member protruding through the magnetic core and the cover member for multiple separation of at least a plurality of winding regions of the coil is formed, and the cover member together with the first separating member A second separator is protruded and formed to multiplely separate the winding regions of the coil into at least a plurality of,
In the filter body, first to fourth inlets and first to fourth outlets for inlet and outlet of the coils that are separately wound in the winding region separated by at least a plurality of pieces by the first and second separators. To form each,
The winding region includes a first winding region in which the first inlet and the first outlet are disposed; A second winding region in which the second inlet and the second outlet are disposed; A third winding region in which the third inlet and the third outlet are disposed; And a fourth winding region disposed with the fourth inlet and the fourth outlet. Including,
The line filter is wound around the first winding region and the second winding region is wound around the second winding region so that the line filter has the same or higher electrical characteristics as the plurality of line filters. Shorting the lead-in end of the lead-in coil, the lead-out end of the coil wound in the third winding region and lead out to the third outlet, and the lead-in end of the coil lead to the fourth inlet so that it is wound in the fourth winding region. A line filter, characterized in that. delete delete delete The method of claim 1,
A line filter, characterized in that at least a plurality of fixing protrusions for fixing and supporting the magnetic core and the cover body are protruding from the inner circumferential surface of the filter body while forming a stacked structure in the mounting groove. The method of claim 5,
The first separator protrudes from a central portion of the seating groove to an opened surface of the filter body, and includes first to fourth partition walls forming a cross-shaped structure, and ends of the first to fourth partition walls A line filter, characterized in that each protruding coupling protrusion. The method of claim 6,
The second separator includes fifth to eighth separation walls each protruding inward from the upper surface of the cover body, and the coupling grooves into which the coupling protrusions are respectively fitted at ends of the fifth to eighth partition walls. Line filter, characterized in that to form a. The method of claim 7,
A line filter, characterized in that a capacitor connection terminal having a connection portion to which at least a plurality of capacitors are connected to each other is formed on the filter body. A substrate on which one line filter configured in claim 8 is mounted; And at least a plurality of capacitors connected to the line filter while being mounted at an arbitrary position around the line filter mounted on the substrate. EMI filter comprising a.

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