CN117012503A - Electromagnetic interference filtering system - Google Patents
Electromagnetic interference filtering system Download PDFInfo
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- CN117012503A CN117012503A CN202211558341.1A CN202211558341A CN117012503A CN 117012503 A CN117012503 A CN 117012503A CN 202211558341 A CN202211558341 A CN 202211558341A CN 117012503 A CN117012503 A CN 117012503A
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- electromagnetic interference
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- 238000001914 filtration Methods 0.000 title claims abstract description 44
- 238000004804 winding Methods 0.000 claims abstract description 100
- 239000003990 capacitor Substances 0.000 claims abstract description 82
- 238000010586 diagram Methods 0.000 description 9
- 230000001965 increasing effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
- H01F17/06—Fixed inductances of the signal type with magnetic core with core substantially closed in itself, e.g. toroid
- H01F17/062—Toroidal core with turns of coil around it
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2895—Windings disposed upon ring cores
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Filters And Equalizers (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
The invention provides an electromagnetic interference filtering system. The electromagnetic interference filtering system comprises a circuit board and a choke. The circuit board is provided with at least more than three capacitors. The choke is arranged on the circuit board and comprises a non-circular magnetic core and at least more than three winding groups, wherein a plurality of winding groups are wound on the non-circular magnetic core. The at least three capacitors are adjacently arranged on the choke, and the first wire outlet ends of the plurality of winding groups are respectively and correspondingly connected with the at least three capacitors.
Description
Technical Field
The present invention relates to an electromagnetic interference filtering system, and more particularly, to an electromagnetic interference filtering system suitable for use in a three-phase system and including a choke having a non-circular magnetic core.
Background
With the progress and development of technology, various types of electrical appliances are very popular and frequently used, and the electrical appliances can be operated normally without using a power supply by using the electrical appliances. However, when an electrical apparatus needs to use an ac power source to operate, noise current is entrained in the current supplied by the ac power source due to power supply, parasitic capacitance of a high frequency transformer or other devices, or operation of stray capacitance, which is an electromagnetic interference (EMI) phenomenon.
Generally, noise generated by using an ac power supply includes differential mode noise (differential) and common mode noise (common mode), and an electromagnetic interference filter can be used as a first line of protection of the power supply against electromagnetic radiation, wherein the electromagnetic interference filter mainly comprises a choke (choke) and a capacitor (capacitor), and the choke is an inductive element for suppressing noise generation and is generally composed of at least one winding, a magnetic core set and a winding frame around which the winding is wound.
Fig. 1A and 1B are schematic diagrams of conventional electromagnetic interference choke coils with different angles, respectively. As shown in fig. 1A and 1B, the known choke 1 generally includes a circular core 11 having a hollow portion and a plurality of coils 12, and the plurality of coils 12 are wound around the hollow circular core 11.
In general, in order to increase the inductance of the known choke 1, it is generally necessary to increase the number of turns of the coil 12. However, as can be seen from fig. 1B, the inner diameter of the circular core 11 is fixed, that is, the space of the hollow portion of the circular core 11 is limited, so that only 3 sets of coils 121, 122, 123 can be wound thereon in the prior art. In other words, even if the number of coils 12 is increased or the number of turns is increased to increase the inductance, the number of coils 12 is limited by the inner diameter of the circular core 11, and it is difficult to further increase.
In addition, since the inner diameter center of the circular magnetic core 11 is smaller (i.e. the space of the hollow portion of the circular magnetic core 11 is smaller), when a larger current flows through the coils 12, the choke 1 may suffer from a problem of a safe distance between the coils 12, which may cause difficulty in routing on the circuit board 3 (as shown in fig. 1C), thereby affecting the layout thereof. For example, as shown in fig. 1A, since the pins 121A and 122a of the coils 121 and 122 wound around the circular magnetic core 11 are too close to each other, when they are disposed on the circuit board 3 as shown in fig. 1C, the problem of the safe distance between the pins 121A and 122a results in difficult routing. In fig. 1C, since the 3 sets of coils 12 are disposed diagonally to each other, the positions of the outgoing lines of the pins 121a, 122a, etc. disposed on the circuit board 3 may be irregularly inclined (i.e. not horizontal or vertical), which further affects the positions and the number of other electronic components 30 or capacitors 31 disposed on the circuit board 3, resulting in difficulty in designing the circuit board 3.
In other conventional technologies, in order to solve the problems of inductance and safety distance of the conventional choke 1, a larger-sized circular magnetic core 11 is required to increase the inductance and meet the safety distance, so that the conventional choke 1 has a larger size, and the electronic device cannot be miniaturized.
Therefore, it is an important issue to develop an electromagnetic interference filtering system that can improve the problems encountered in the prior art.
Disclosure of Invention
An objective of the present invention is to provide an electromagnetic interference filtering system, and more particularly, to an electromagnetic interference filtering system suitable for a three-phase system and including a choke having a non-circular magnetic core, wherein the inner diameter of the non-circular magnetic core is larger to enable the winding positions of the winding groups to be pulled apart by a certain distance, so as to solve the problem of wire walking of the circuit board in the prior art.
The invention further provides an electromagnetic interference filtering system comprising a choke with a non-circular magnetic core, wherein the number and the positions of the capacitors on the circuit board are flexibly adjusted by the form of the non-circular magnetic core and the winding positions of at least three groups of winding groups and the series-parallel connection mode, so that the space utilization rate of the circuit board is effectively increased, and the effects of reducing the volume of the whole device, increasing the inductance, or being capable of current diversion and reducing the loss are achieved.
According to the present invention, an electromagnetic interference filtering system is provided, which includes a circuit board and a choke. The circuit board is provided with at least more than three capacitors. The choke is arranged on the circuit board and comprises: the winding device comprises a non-circular magnetic core and at least more than three winding groups, wherein a plurality of winding groups are wound on the non-circular magnetic core. The choke is provided with at least three capacitors, and the first wire outlet ends of the winding groups are respectively and correspondingly connected with the at least three capacitors.
The present invention contemplates that the non-circular magnetic core has a hollow portion, and when at least three or more winding groups are wound on the non-circular magnetic core, a part of the plurality of winding groups passes through the hollow portion of the non-circular magnetic core.
The idea according to the invention is that the non-circular core is an elliptical ring core.
The non-circular magnetic core comprises an elliptical ring body and a U-shaped extension part.
The invention contemplates that at least three capacitors are disposed adjacent to one side of the choke when the choke is disposed on the circuit board.
The invention contemplates that when the choke is disposed on the circuit board, at least three or more capacitors are disposed adjacent to two opposite sides of the choke.
The present invention contemplates that at least three or more winding sets are arranged in series, or in parallel, or in series-parallel.
The electromagnetic interference filtering system further comprises an additional circuit board, wherein the additional circuit board is provided with at least one capacitor and is correspondingly connected with the second wire outlet ends of at least more than three groups of winding groups.
According to the present invention, there is provided an electromagnetic interference filtering system comprising: circuit board, additional circuit board and choke. The circuit board is provided with at least more than three capacitors. The additional circuit board is provided with at least one capacitor. The choke is clamped between the circuit board and the additional circuit board and comprises: the winding device comprises a non-circular magnetic core and at least more than three winding groups, wherein a plurality of winding groups are wound on the non-circular magnetic core. The at least three capacitors on the circuit board and the at least one capacitor on the additional circuit board are adjacent to the choke, the first wire outlet ends of the at least three wire winding groups are correspondingly connected with the at least three capacitors on the circuit board, and the second wire outlet ends of the at least three wire winding groups are correspondingly connected with the at least one capacitor on the additional circuit board.
According to the invention, the bottom side of the choke is correspondingly arranged on the circuit board, and the top side of the choke is correspondingly arranged on the additional circuit board.
The invention has the beneficial effects that the invention provides an electromagnetic interference filtering system which comprises a circuit board and a choke, wherein the choke comprises a non-circular magnetic core and at least more than three groups of winding groups, and the at least more than three groups of winding groups are wound on the non-circular magnetic core, are connected with and are adjacent to a capacitor arranged on the circuit board. Because the inner diameter of the non-circular magnetic core is larger, the winding positions of at least three groups of winding groups can be pulled apart by a certain distance, so that the problem of wire walking of the circuit board in the prior art is solved.
Drawings
Fig. 1A and 1B are schematic diagrams of conventional electromagnetic interference choke coils with different angles, respectively.
Fig. 1C is a schematic diagram of the conventional electromagnetic interference choke coil shown in fig. 1A disposed on a circuit board.
Fig. 2 is a schematic diagram of an electromagnetic interference filtering system according to a preferred embodiment of the present invention.
Fig. 3 is a schematic view of the choke shown in fig. 2.
Fig. 4A is a schematic diagram of a choke coil of an electromagnetic interference filtering system according to a second preferred embodiment of the present invention.
Fig. 4B is a schematic diagram of a choke coil of an electromagnetic interference filtering system according to a third preferred embodiment of the present invention.
Fig. 5A is a schematic side view of an emi filter system according to a fourth preferred embodiment of the invention.
Fig. 5B is a schematic top view of fig. 5A.
Fig. 6 is a schematic top view of an emi filter system according to a fifth preferred embodiment of the invention.
Fig. 7A is a schematic side view of an electromagnetic interference filtering system according to a sixth preferred embodiment of the present invention.
Fig. 7B is a schematic top view of fig. 7A.
Fig. 8 is a schematic perspective view of an electromagnetic interference filtering system according to a seventh preferred embodiment of the present invention.
The reference numerals are as follows:
1: known choke
11: round magnetic core
12. 121, 122, 123: coil
121a, 122a: pin
2: choke device
21: non-circular magnetic core
210: hollow part
211: a first magnetic part
212: second magnetic part
213: third magnetic part
214: fourth magnetic part
215: elliptical ring body
216: u-shaped extension part
22: winding group
22a: first wire outlet end
22b: second outlet end
3: circuit board
30: electronic component
31. 61: capacitance device
31a: y capacitor
31b: x capacitor
4. 5, 7: electromagnetic interference filtering system
6: additional circuit board
Detailed Description
Some exemplary embodiments embodying features and advantages of the present invention will be described in detail in the following description. It will be understood that the invention is capable of modification in various other forms without departing from the scope of the invention, and that the description and illustrations herein are intended to be by way of illustration only and not to be construed as limiting the invention.
Please refer to fig. 2 and 3. Fig. 2 is a schematic diagram of an electromagnetic interference filtering system according to a preferred embodiment of the present invention. Fig. 3 is a schematic view of the choke shown in fig. 2. In the present embodiment, the electromagnetic interference filtering system 4 is suitable for a three-phase system, and includes a circuit board 3 and a choke 2. The choke 2 may be, but is not limited to, a noise filter or an inductor for use in a circuit board assembly of an electronic device such as a switching power supply or the like for suppressing electromagnetic noise. The circuit board 3 is provided with a plurality of electronic components 30, and includes at least three or more capacitors 31 therein. The choke 2 is disposed on the circuit board 3 and includes a non-circular magnetic core 21 and at least three or more winding groups 22. The non-circular core 21 has a hollow portion 210 inside, and at least three or more winding groups 22 are correspondingly wound on the non-circular core 21. The non-circular core 21 may have any shape other than a circular shape, and in this embodiment, the non-circular core 21 is an elliptical ring core with a shape similar to a square shape, but is not limited thereto. And when the choke 2 is disposed on the circuit board 3, at least three or more capacitors 31 are disposed adjacent to one side of the choke 2, and the first wire outlets 22a of the at least three groups of wire winding groups 22 are respectively connected to the at least three or more capacitors 31.
As shown in fig. 3, in the present embodiment, the non-circular magnetic core 21 of the choke 2 is an elliptical ring magnetic core and includes a first magnetic portion 211, a second magnetic portion 212, a third magnetic portion 213 and a fourth magnetic portion 214, wherein the first magnetic portion 211 and the second magnetic portion 212 are disposed in parallel with each other and are corresponding to each other, the third magnetic portion 213 and the fourth magnetic portion 214 are disposed in parallel with each other and are respectively disposed between the first magnetic portion 211 and the second magnetic portion 212, and the lengths of the first magnetic portion 211 and the second magnetic portion 212 are greater than those of the third magnetic portion 213 and the fourth magnetic portion 214. In the present embodiment, the connection points of the first magnetic portion 211, the second magnetic portion 212, the third magnetic portion 213 and the fourth magnetic portion 214 are rounded structures, but not limited thereto. For example, the winding sets 22 may be, but not limited to, copper foil coils, and the number of the winding sets is 6, but the shape of the non-circular magnetic core 21 and the number and the material of the winding sets 22 are not limited thereto, and may be changed according to the practical implementation situation. In the present embodiment, 6 sets of winding groups 22 are wound around the non-circular magnetic core 21 and spaced apart from each other, and a portion of each winding group 22 passes through the hollow portion 210 of the non-circular magnetic core 21. In some embodiments, 2 groups of 6 groups of winding groups 22 are wound around the first magnetic portion 211, 3 groups of winding groups are wound around the second magnetic portion 212, and 1 group of winding groups are wound around the third magnetic portion 213, and the wire-outgoing positions thereof are arranged in a substantially regular manner, i.e. in a horizontal direction or a vertical direction. However, the winding position of the winding set 22 is not limited thereto, and may be changed according to the actual implementation.
Please refer to fig. 1C and fig. 2 at the same time. In the present embodiment, since the non-circular magnetic core 21 is an elliptical ring magnetic core, the space of the hollow portion 210 inside the non-circular magnetic core is larger, so that the winding distance between the winding groups 22 can be adjusted according to the actual wiring requirement, compared with the prior art shown in fig. 1C, the winding distance of the winding groups 22 of the present embodiment is larger, so as to solve the problem of difficult wiring in the prior art. In addition, in the present embodiment, 6 sets of winding groups 22 are wound on the elliptical ring magnetic core, and when the 6 sets of winding groups 22 are arranged in series, the number of turns of the winding groups 22 is significantly larger than that of each coil 12 in the prior art, in other words, the winding groups 22 of the present embodiment can increase the inductance by connecting the sets of winding groups 22 in series. In other embodiments, if the current is to be dispersed when the current is too large to reduce the loss, the 6 sets of windings 22 may be arranged in parallel, but the current may be split to reduce the loss. Furthermore, if comparing the electromagnetic interference filtering system 4 of the present embodiment with the prior art, as shown in fig. 2, since the non-circular magnetic core 21 of the present embodiment is an elliptical magnetic core, the wire-outgoing positions of the 6 groups of wire-wound sets 22 are arranged substantially regularly, i.e. horizontally or vertically, when the non-circular magnetic core is arranged on the circuit board 3, the wire-outgoing positions have sufficient space around to be arranged with the electronic components, and 14 electronic components can be arranged on the circuit board 3 of the present invention, and the circuit board 3 has less free space. In contrast, in fig. 1C, since the choke coil 1 in the prior art is a circular magnetic core 11, and 3 sets of coils 12 are wound on the circular magnetic core 11 in a manner of being diagonally opposite to each other, the wire outlet position is inclined in an oblique manner, so that the arrangement of electronic components is limited by the shape of the circular magnetic core 11 and the inclined wire outlet position, and the periphery thereof is difficult to arrange, only 11 electronic components can be arranged on the circuit board 3 in the prior art, and the circuit board 3 has more space which is difficult to use, so that the space utilization rate is obviously poor. Therefore, in this embodiment, the oval ring-shaped magnetic core is adopted as the non-circular magnetic core 21, and at least three winding groups 22 are arranged around the non-circular magnetic core 21 in a substantially horizontal or vertical manner, so that the space utilization of the circuit board 3 can be effectively improved, and the number of electronic components on the circuit board 3 can be increased, thereby being beneficial to the layout and planning design of the circuit board 3. Of course, the number of electronic components on the circuit board 3 of the present embodiment is not limited to the above number, and may be changed according to the actual implementation situation.
Please refer to fig. 4A and fig. 4B. Fig. 4A is a schematic diagram of a choke coil of an electromagnetic interference filtering system according to a second preferred embodiment of the present invention. Fig. 4B is a schematic diagram of a choke coil of an electromagnetic interference filtering system according to a third preferred embodiment of the present invention. As can be seen from fig. 4A and 4B, the non-circular core 21 of the choke 2 of the present embodiment is not limited to an elliptical ring core, but may be irregular. In some embodiments, the non-circular core 21 of the choke 2 is a wavy toroidal core, and the inner side of the non-circular core is also provided with a hollow portion, as shown in fig. 4A, the at least three winding groups 22 are wound on the non-circular core 21 of the wavy toroidal core separately from each other, and a portion of each winding group 22 passes through the hollow portion 210 of the non-circular core 21. In other embodiments, the non-circular core 21 of the choke 2 is a star-shaped toroidal core as shown in fig. 4B, wherein the at least three or more winding groups 22 are also wound on the non-circular core 21 of the star-shaped toroidal core and are separated from each other, and a portion of each winding group 22 passes through the hollow portion 210 of the non-circular core 21. It can be seen that the non-circular core 21 of the choke 2 according to the present invention can be any shape other than circular, and can have various shapes, and can be changed according to the actual implementation, and is not limited to the above-mentioned methods.
Please refer to fig. 5A and fig. 5B. Fig. 5A is a schematic side view of an emi filter system according to a fourth preferred embodiment of the invention. Fig. 5B is a schematic top view of fig. 5A. In the present embodiment, the electromagnetic interference filtering system 4 also includes a circuit board 3 and a choke 2. The choke 2 is disposed on the circuit board 3, and includes a non-circular magnetic core 21 and at least three or more winding groups 22, wherein the at least three or more winding groups 22 are wound on the non-circular magnetic core 21 and are separated from each other, and a portion of each winding group 22 passes through a hollow portion 210 of the non-circular magnetic core 21. In this embodiment, the number of turns of any two winding groups 2 is the same, so that they can be arranged in series or parallel according to different situations as in the previous embodiment to increase the inductance or shunt the current. Of course, in other embodiments, the serial-parallel arrangement may be adopted, which may be changed according to the actual implementation situation, and is not limited thereto. And, the circuit board 3 has at least more than three capacitors 31, for example, the number of the at least more than three capacitors 31 is 3, the 3 capacitors 31 are adjacently disposed on one side of the choke 2, and the first wire outlets 22a of the at least more than three groups of winding groups 22 are respectively and correspondingly connected to the 3 capacitors 31, so that the second wire outlets 22b of the at least more than three groups of winding groups 22 may be connected to another far-end circuit board (not shown) through wires so as to be correspondingly connected to the capacitors (not shown) on the far-end circuit board. In other words, taking the present embodiment as an example, it is mainly shown that one side of the choke 2 can be directly electrically connected to at least three capacitors 31 on the circuit board 3, and the other side is electrically connected to a remote circuit board (not shown) through a wire. However, in other embodiments, the circuit board 3 may have 4, 5 or 6 capacitors 31, which may be disposed on two opposite sides of the winding set 2, or on any two sides. The number and the arrangement positions of the capacitors 31 are mainly controlled according to the type of the non-circular magnetic core 21 of the choke 2 and the wire outlet position of the winding set 2, but not limited thereto. In addition, in some embodiments, the capacitor 31 may include a Y capacitor 31a and an X capacitor 31b, and the first wire outlets 22a of the at least three groups of the wire winding groups 22 are correspondingly connected to the Y capacitor 31a and the X capacitor 31b at the same time, but not limited thereto. In other embodiments, the choke 2 may be a differential-mode inductor or a common-mode inductor, and may be optionally matched with the required Y-capacitor 31a and X-capacitor 31b, and the number and arrangement thereof are not limited thereto.
Please refer to fig. 6. Fig. 6 is a schematic top view of an emi filter system according to a fifth preferred embodiment of the invention. In this embodiment, the structure and arrangement of the circuit board 3 and the choke 2 of the electromagnetic interference filtering system 4 are substantially the same as those of the previous embodiment. However, in the present embodiment, the non-circular core 21 of the choke 2 is formed by combining an elliptical ring core and a U-shaped core. In other words, the non-circular magnetic core 21 has an elliptical ring body 215, and a portion of the elliptical ring body 215 protrudes outwards to form a U-shaped extension 216, i.e. two ends of the elliptical ring body 215 are correspondingly connected with two ends of the U-shaped extension 216. In the present embodiment, at least three or more winding sets 22 are separately wound on the elliptical ring body 215, but not on the U-shaped extension 216. However, in other embodiments, the winding 22 may also be wound on the U-shaped extension 216 to match the wiring configuration of the circuit board 3 and the position of the capacitor 31 thereon. Therefore, the shape of the non-circular magnetic core 21 and the winding positions of at least three or more winding groups 22 can be changed according to the configuration of the circuit board 3.
Please refer to fig. 7A and 7B. Fig. 7A is a schematic side view of an electromagnetic interference filtering system according to a sixth preferred embodiment of the present invention. Fig. 7B is a schematic top view of fig. 7A. As shown in fig. 7A and 7B, the electromagnetic interference filtering system 5 of the present embodiment includes not only the circuit board 3 and the choke 2, but also another additional circuit board 6. As can be seen from fig. 7A, the choke 2 of the present embodiment is sandwiched between the circuit board 3 and the additional circuit board 6 to form a sandwich-type electromagnetic interference filtering system 5. In the present embodiment, the top side of the choke 2 is correspondingly connected to the additional circuit board 6, and the bottom side is correspondingly arranged on the circuit board 3, so that the choke 2 is sandwiched between the circuit board 3 and the additional circuit board 6. As shown in fig. 7B, the choke 2 also includes a non-circular magnetic core 21 and at least three or more winding groups 22, wherein the number of the at least three or more winding groups 22 is 6 in the present embodiment, that is, the 6 winding groups 22 of the present embodiment are wound on the non-circular magnetic core 21 and are separated from each other, and a portion of each winding group 22 passes through the hollow portion 210 of the non-circular magnetic core 21. Similar to the foregoing embodiment, the circuit board 3 has at least three capacitors 31, for example, the circuit board 3 has 3 capacitors, and the 3 capacitors 31 are adjacent to one side of the choke 2 and are correspondingly connected to the first wire outlet ends 22a of the 6 groups of winding groups 22. Similarly, at least three or more capacitors 61 are also disposed on the additional circuit board 6, and in this embodiment, the number of the at least three or more capacitors 61 is 3, and as can be seen in fig. 7A, the 3 capacitors 61 are correspondingly disposed on two opposite sides of the choke 2, i.e. 2 capacitors 61 are disposed on one side of the choke 2, and 1 capacitor 61 is disposed on the other side of the choke 2, so as to sandwich the choke 2 between the 3 capacitors 61. And the 3 capacitors 61 are correspondingly connected with the second wire outlet ends 22b of the 6 groups of winding groups 22. In the present embodiment, since the capacitor 31 on the circuit board 3 and the capacitor 61 on the additional circuit board 6 are adjacent to the choke 2, electromagnetic interference can be effectively suppressed. In some embodiments, the capacitor 31 and the capacitor 61 may be correspondingly adjacent to the choke 2 by a locking manner, but not limited thereto. In addition, by the sandwich arrangement mode of the embodiment, the arrangement positions and the number of the components of the circuit board 3 and the additional circuit board 6 can be more flexibly controlled. For example, when the space of the circuit board 3 is insufficient to arrange 6 capacitors 31, for example, only 3 capacitors or 4 capacitors can be arranged, by arranging the additional circuit board 6, 3 capacitors or 2 capacitors which cannot be arranged can be arranged on the additional circuit board 6 in an auxiliary manner, so as to regulate or increase the capacitors 61 on the branch circuit. In this way, by the arrangement mode of the three-dimensional interlayer, the horizontal wire outlet direction of the winding group 22 can be changed into the vertical wire outlet direction, so that the whole volume of the electromagnetic interference filtering system 5 can be reduced, and the space utilization rate of the circuit board 3 and the additional circuit board 6 can be improved.
Please refer to fig. 8. Fig. 8 is a schematic perspective view of an electromagnetic interference filtering system according to a seventh preferred embodiment of the present invention. In this embodiment, the structure of the circuit board 3 and the choke 2 of the electromagnetic interference filtering system 7 is substantially the same as that of the previous embodiment, i.e. the circuit board 3 includes at least three or more capacitors 31, the choke 2 is disposed on the circuit board 3 and includes a non-circular magnetic core 21 and at least three or more winding groups 22, and at least three or more winding groups 22 are wound on the non-circular magnetic core 21 and are disposed separately from each other, and a portion of each winding group 22 passes through the hollow portion 210 of the non-circular magnetic core 21. However, in the present embodiment, the number of at least three or more capacitors 31 of the circuit board 3 is 3, and 1 of the capacitors 31 is disposed on one side of the choke 2, and the other 2 capacitors 31 are correspondingly disposed on the other side of the choke 2. In other words, the 3 capacitors 31 are respectively disposed on two opposite sides of the choke 2, and sandwich the at least three or more winding groups 22 therebetween, and are correspondingly connected to the first wire outlet ends 22a (not shown) of the at least three or more winding groups 22. Therefore, the number and the arrangement position of the capacitors 31 of the circuit board 3 can be changed according to the size and the practical situation of the circuit board 3, but not limited to this, the change needs to make at least three capacitors 31 arranged adjacent to the choke 2, so as to achieve the effect of suppressing electromagnetic interference.
In summary, the present invention provides an electromagnetic interference filtering system, which includes a circuit board and a choke, wherein the choke includes a non-circular magnetic core and at least three or more winding groups, and the at least three or more winding groups are wound on the non-circular magnetic core and are connected to and adjacent to a capacitor on the circuit board. Because the inner diameter of the non-circular magnetic core is larger, the winding positions of at least three groups of winding groups can be pulled apart by a certain distance, so that the problem of wire walking of the circuit board in the prior art is solved. Furthermore, by arranging at least three or more winding groups in series, the inductance can be greatly increased, or at least three or more winding groups are arranged in parallel, so that the current can be split, and the loss can be reduced. Therefore, the non-circular magnetic core of the choke and the winding positions of at least three groups of winding groups and the series-parallel connection mode can flexibly allocate the number and the positions of the capacitors on the circuit board, so that the space utilization rate of the circuit board is effectively increased, and the effects of inhibiting electromagnetic interference, reducing the volume of the whole device, increasing the inductance, or carrying out current diversion and reducing loss are achieved.
The present invention is modified in a manner that would be apparent to one skilled in the art without departing from the scope of the invention as set forth in the appended claims.
Claims (10)
1. An electromagnetic interference filtering system comprising:
a circuit board provided with at least three capacitors; and
a choke, which is arranged on the circuit board and comprises:
a non-circular core; and
at least more than three winding groups, wherein a plurality of the winding groups are wound on the non-circular magnetic core;
the at least three capacitors are adjacently arranged on the choke, and a first wire outlet end of the plurality of winding groups is correspondingly connected with the at least three capacitors respectively.
2. The electromagnetic interference filtering system of claim 1, wherein the non-circular magnetic core has a hollow portion, and a portion of the plurality of winding groups passes through the hollow portion of the non-circular magnetic core when the at least three winding groups are wound around the non-circular magnetic core.
3. The electromagnetic interference filtering system of claim 1, wherein the non-circular core is an elliptical toroidal core.
4. The electromagnetic interference filtering system of claim 1, wherein the non-circular core comprises an elliptical ring body and a U-shaped extension.
5. The electromagnetic interference filtering system of claim 1, wherein the at least three capacitors are disposed adjacent to one side of the choke when the choke is disposed on the circuit board.
6. The electromagnetic interference filtering system of claim 1, wherein the at least three capacitors are disposed on opposite sides of the choke when the choke is disposed on the circuit board.
7. The electromagnetic interference filtering system of claim 1, wherein the at least three or more winding sets are arranged in series, in parallel, or in both series and parallel.
8. The electromagnetic interference filtering system of claim 1, further comprising an additional circuit board having at least one capacitor thereon for corresponding connection with a second outlet of the at least three winding sets.
9. An electromagnetic interference filtering system comprising:
a circuit board provided with at least three capacitors;
an additional circuit board provided with at least one capacitor; and
a choke sandwiched between the circuit board and the additional circuit board and comprising:
a non-circular core; and
at least more than three winding groups, wherein a plurality of the winding groups are wound on the non-circular magnetic core;
the at least three capacitors on the circuit board and the at least one capacitor on the additional circuit board are adjacent to the choke, a first wire outlet end of the at least three wire winding groups is correspondingly connected with the at least three capacitors on the circuit board, and a second wire outlet end of the at least three wire winding groups is correspondingly connected with the at least one capacitor on the additional circuit board.
10. The electromagnetic interference filtering system of claim 9, wherein a bottom side of the choke is correspondingly disposed on the circuit board and a top side of the choke is correspondingly disposed on the additional circuit board.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18/110,748 US20230360848A1 (en) | 2022-05-04 | 2023-02-16 | Emi filter system |
| JP2023023865A JP2023165608A (en) | 2022-05-04 | 2023-02-17 | Noise filter |
| EP23167296.5A EP4273895A1 (en) | 2022-05-04 | 2023-04-11 | Emi filter system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US202263338279P | 2022-05-04 | 2022-05-04 | |
| US63/338,279 | 2022-05-04 |
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| Publication Number | Publication Date |
|---|---|
| CN117012503A true CN117012503A (en) | 2023-11-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211558341.1A Pending CN117012503A (en) | 2022-05-04 | 2022-12-06 | Electromagnetic interference filtering system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN117012503A (en) |
| TW (1) | TWI834415B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM517432U (en) * | 2015-08-20 | 2016-02-11 | 鴻騰精密科技股份有限公司 | Network signal filtering circuit and network connector using the same |
| JP7467329B2 (en) * | 2018-03-02 | 2024-04-15 | Tdk株式会社 | Magnetic core, its manufacturing method, and coil component |
| JP2020178122A (en) * | 2019-04-16 | 2020-10-29 | 株式会社エス・エッチ・ティ | Choke coil and manufacturing method thereof |
| CN212322767U (en) * | 2020-04-28 | 2021-01-08 | 烟台艾迪精密机械股份有限公司 | Novel topological three-phase inverter EMI filter |
| CN111554472B (en) * | 2020-05-26 | 2022-03-25 | 台达电子企业管理（上海）有限公司 | Filter inductance and vehicle-mounted charger |
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2022
- 2022-12-06 TW TW111146726A patent/TWI834415B/en active
- 2022-12-06 CN CN202211558341.1A patent/CN117012503A/en active Pending
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| Publication number | Publication date |
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| TWI834415B (en) | 2024-03-01 |
| TW202345500A (en) | 2023-11-16 |
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