CN115732195A - Transformer and electromagnetic device using same - Google Patents

Abstract

The invention discloses a transformer and an electromagnetic device applying the same, wherein the transformer comprises a circuit board, an annular magnetic core, a first signal coil and a second signal coil; the circuit board at least comprises a first layer and a second layer which are arranged in a stacked mode; the annular magnetic core is embedded in the circuit board; the first signal coil and the second signal coil are wound on the annular magnetic core; the input end and the output end of the first signal coil are defined as a first connecting line of the first leading-out terminal group and the central axis of the annular magnetic core, the input end and the output end of the second signal coil are defined as a second connecting line of the second leading-out terminal group and the central axis of the annular magnetic core, and the absolute value of the projection included angle of the first connecting line and the second connecting line on a plane perpendicular to the central axis of the annular magnetic core is greater than or equal to 157.5 degrees and less than or equal to 202.5 degrees. Through the mode, the interference between the first signal coil and the second signal coil can be reduced, return loss is restrained, and therefore the performance of the whole transformer is improved.

Description

Transformer and electromagnetic device using same

Technical Field

The invention relates to the technical field of integrated circuits, in particular to a transformer and an electromagnetic device using the same.

Background

With the development of network technology, networks become an indispensable important component of modern life. Transformers connected to network interfaces are gaining increasing attention due to their functions of electrical voltage isolation, differential mode signal transmission, impedance matching, waveform restoration, signal noise suppression, and the like.

The internal structure of the existing transformer comprises a magnetic ring, and an input coil and an output coil which are wound around the magnetic ring, wherein the input coil is provided with a signal input port, the output coil is provided with a signal output port, and the signal input port and the signal output port are arranged at positions which are relatively close to each other in the prior art.

Disclosure of Invention

The invention mainly provides a transformer and an electromagnetic device using the same. The problem of mutual interference caused by the fact that the signal input port and the signal output port are arranged at the close positions in the prior art is solved.

In order to solve the technical problems, the invention adopts a technical scheme that: provided is a transformer including: a circuit board including at least a first layer and a second layer which are stacked; the annular magnetic core is embedded in the circuit board; the first signal coil and the second signal coil are wound on the annular magnetic core; the first signal coil and the second signal coil comprise a first graph part formed on a first layer of the circuit board, a second graph part formed on a second layer of the circuit board and a conducting column connecting the first graph part and the second graph part, input ends and output ends of the first signal coil and the second signal coil are led out from the first graph part and/or the second graph part, a connecting line between the input end and the output end of the first signal coil and a central axis of the annular magnetic core is defined as a first connecting line, a connecting line between the input end and the output end of the second signal coil and the central axis of the annular magnetic core is defined as a second connecting line, and an absolute value of an included angle projected by the first connecting line and the second connecting line on a plane perpendicular to the central axis of the annular magnetic core is larger than or equal to 157.5 degrees and smaller than or equal to 202.5 degrees.

According to an embodiment of the present invention, an absolute value of an included angle formed by projecting the first connection line and the second connection line on a plane perpendicular to the central axis of the toroidal core is greater than or equal to 165 degrees and less than or equal to 195 degrees.

According to an embodiment of the present invention, an absolute value of an included angle between the first connection line and the second connection line projected on a plane perpendicular to the central axis of the annular magnetic core is greater than or equal to 175 degrees and less than or equal to 185 degrees.

According to an embodiment provided by the present invention, an absolute value of an included angle projected by a connection line between the input end of the first signal coil and the central axis of the annular magnetic core and a connection line between the input end of the second signal coil and the central axis of the annular magnetic core on a plane perpendicular to the central axis of the annular magnetic core is greater than or equal to 157.5 degrees and less than or equal to 202.5 degrees; and/or the absolute value of the projection included angle of the connecting line of the output end of the first signal coil and the central axis of the annular magnetic core and the connecting line of the output end of the second signal coil and the central axis of the annular magnetic core on a plane vertical to the central axis of the annular magnetic core is larger than or equal to 157.5 degrees and smaller than or equal to 202.5 degrees; and/or defining a central line of a connecting line of the input end and the output end of the first signal coil and the central axis of the annular magnetic core respectively as a third connecting line, defining a central line of a connecting line of the input end and the output end of the second signal coil and the central axis of the annular magnetic core respectively as a fourth connecting line, and defining an absolute value of an included angle projected by the third connecting line and the fourth connecting line on a plane perpendicular to the central axis of the annular magnetic core to be larger than or equal to 157.5 degrees and smaller than or equal to 202.5 degrees.

According to an embodiment of the present invention, the first pattern part, the second pattern part and the via are all conductors.

According to an embodiment of the present invention, the transformer further includes a first tap line and a second tap line, the first tap line is connected to the first signal coil and includes a first tap end led out from the first graphic part or the second graphic part, the second tap line is connected to the second signal coil and includes a second tap end led out from the first graphic part or the second graphic part, a connection line between the first tap end and the central axis of the toroidal core is defined as a fifth connection line, a connection line between the second tap end and the central axis of the toroidal core is defined as a sixth connection line, and an absolute value of an included angle projected by the fifth connection line and the sixth connection line on a plane perpendicular to the central axis of the toroidal core is greater than or equal to 157.5 degrees and less than or equal to 202.5 degrees.

According to an embodiment of the present invention, each of the first pattern part and the second pattern part includes a plurality of first conductive patterns and a plurality of second conductive patterns alternately arranged along a circumferential direction of the annular magnetic core; wherein the first signal coil comprises a first conductive pattern;

the second signal coil includes a second conductive pattern;

at least part of the second wire patterns are not equal to the distances between two adjacent first wire patterns in two opposite directions at the position which is away from the central axis of the annular magnetic core by a preset distance or a preset distance range.

According to an embodiment of the present invention, at a position away from the central axis of the toroidal core by a predetermined distance or a predetermined distance range, the first conductive line pattern has a first pitch with respect to one of two first conductive line patterns adjacent in two opposite directions, and a second pitch with respect to the other of the two first conductive line patterns adjacent in the two opposite directions; the difference between the first distance and the second distance is greater than or equal to 5um.

According to an embodiment of the present invention, between the inner ring and the outer ring of the annular magnetic core, a distance between the first conductive wire pattern and two adjacent second conductive wire patterns is kept equal in the radial direction or gradually increases in the radial direction in a direction from the inner ring to the outer ring of the annular magnetic core.

According to an embodiment provided by the present invention, the circuit board includes: a central portion provided with a plurality of inner via holes penetrating through the first layer and the second layer of the circuit board; the peripheral part is provided with a plurality of outer conducting holes penetrating through the first layer and the second layer of the circuit board; and the annular accommodating groove is arranged between the central part and the peripheral part.

According to an embodiment of the present invention, the annular magnetic core is disposed in the annular accommodating groove, and the conductive via is disposed in the inner conductive vias and the outer conductive vias.

In order to solve the technical problem, the invention adopts another technical scheme that: there is provided an electromagnetic device comprising a transformer as claimed in any one of the preceding claims.

The invention has the beneficial effects that: different from the prior art, the input end and the output end of the first signal coil are used as a first leading-out terminal group, the input end and the output end of the second signal coil are used as a second leading-out terminal group, a connecting line of the first leading-out terminal group and the central axis of the annular magnetic core is defined as a first connecting line, a connecting line of the second leading-out terminal group and the central axis of the annular magnetic core is defined as a second connecting line, and an absolute value of an included angle formed by projection of the first connecting line and the second connecting line on a plane perpendicular to the central axis of the annular magnetic core is greater than or equal to 157.5 degrees and less than or equal to 202.5 degrees.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic top view of a first embodiment of a transformer provided by the present invention;

FIG. 2 is a schematic diagram of a circuit board of the transformer shown in FIG. 1;

FIG. 3 is a schematic diagram of the transformer shown in FIG. 1 except for the circuit board;

FIG. 4 is a schematic top view of a first embodiment of a transformer provided by the present invention;

fig. 5 is an enlarged schematic view of a partial region a in the transformer shown in fig. 4.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, back, 8230; etc.) are involved in the embodiment of the present invention, the directional indications are only used for explaining the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the figure), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a transformer 10, wherein the transformer 10 at least includes a circuit board 100, a toroidal core 200, a first signal coil 300, and a second signal coil 400.

Referring to fig. 1 and fig. 2, the circuit board 100 may be a double-layer circuit board, a triple-layer circuit board, or other multi-layer circuit board, and at least includes a first layer 110 and a second layer 120 that are stacked. The ring core 200 is embedded in the circuit board 100, and the first signal coil 300 and the second signal coil 400 are wound around the ring core 200. The first layer 110 and the second layer 120 may be formed by pressing a fusible medium, and the annular magnetic core 200 is adhered to the inside of the circuit board 100 by an adhesive material, thereby forming the transformer 10 integrally as the circuit board 100. Specifically, the first signal coil 300 and the second signal coil 400 are mutually induced to form a transformer structure, in a specific embodiment, the whole first signal coil 300 can be used as an input end of the transformer structure, and the whole second signal coil 400 can be used as an output end of the transformer structure.

Referring to fig. 1 to 3, the first signal coil 300 and the second signal coil 400 include a first pattern portion 130 formed on the first layer 110 of the circuit board 100, a second pattern portion 140 formed on the second layer 120 of the circuit board 100, and a conductive via 150 connecting the first pattern portion 130 and the second pattern portion 140. Input and output terminals of the first signal coil 300 and the second signal coil 400 are led out from the first pattern part 130 and/or the second pattern part 140.

Alternatively, the first signal coil 300 and the second signal coil 400 are wound on the toroidal core 200 clockwise or counterclockwise along the circumferential direction of the toroidal core 200, and the first pattern part 130 is formed on the first layer 110, the second pattern part 140 is formed on the second layer 120, and the first pattern part 130 and the second pattern part 140 are connected by a conductive via 150 penetrating through the first layer 110 and the second layer 120. The input end 310 and the output end 320 of the first signal coil 300 are led out from the first pattern part 130 and/or the second pattern part 140. Alternatively, the input end 310 and the output end 320 of the first signal coil 300 may be both located on the same layer, such as both located on the first pattern part 130 or both located on the second pattern part 140. It is also possible that the input end 310 and the output end 320 of the first signal coil 300 are located on different layers, for example, the input end 310 is located on the first pattern part 130, and the output end 320 is located on the second pattern part 140, or the input end 310 is located on the second pattern part 140 and the output end 320 is located on the first pattern part 130, which is not limited in this embodiment. Similarly, the input end 410 and the output end 420 of the second signal coil 400 may be located on the same layer or different layers.

Alternatively, for the input and output ends of the same signal coil, the projections on the plane perpendicular to the central axis of the toroidal core 200 are coincident or close to each other.

The input and output ends of the first signal coil 300 and the second signal coil 400 are led out outwards, i.e. the input and output ends are arranged in the direction departing from the central axis of the annular magnetic core 200.

A first connection line is defined as a connection line between the input end 310 and the output end 320 of the first signal coil 300 as a first leading-out terminal set 330 and the central axis of the toroidal core 200.

A connection line between the input end 410 and the output end 420 of the second signal coil 400 as the second outgoing terminal group 430 and the central axis of the annular magnetic core 200 is defined as a second connection line, and an absolute value of an included angle formed by projection of the first connection line and the second connection line on a plane perpendicular to the central axis of the annular magnetic core 200 is greater than or equal to 157.5 degrees and less than or equal to 202.5 degrees. Specifically, the angle may be 157.5 degrees, 160 degrees, 170 degrees, 175 degrees, 180 degrees, 185 degrees, 190 degrees, or 202.5 degrees, which is not specifically limited herein.

In an alternative embodiment, the connection line between the input end 310 and the output end 320 of the first signal coil 300 as the first outgoing terminal set 330 and the midpoint of the annular magnetic core 200 may be defined as a first connection line, and the connection line between the input end 410 and the output end 420 of the second signal coil 400 as the second outgoing terminal set 430 and the midpoint of the annular magnetic core 200 may be defined as a second connection line.

As shown in fig. 1, when an angle formed by projecting the first connection line and the second connection line on a plane perpendicular to the central axis of the toroidal core 200 is α, an absolute value of α is greater than or equal to 157.5 degrees and less than or equal to 202.5 degrees.

In this way, the input end 310 and the output end 320 of the first signal coil 300 are used as the first outgoing terminal group 330, the input end 410 and the output end 420 of the second signal coil 400 are used as the second outgoing terminal group 430, a connection line of the first outgoing terminal group 330 and the central axis of the toroidal core 200 is defined as a first connection line, a connection line of the second outgoing terminal group 430 and the central axis of the toroidal core 200 is defined as a second connection line, and an absolute value of an included angle formed by projection of the first connection line and the second connection line on a plane perpendicular to the central axis of the toroidal core 200 is greater than or equal to 157.5 degrees and less than or equal to 202.5 degrees, so that a distance between the first outgoing terminal group 330 and the second outgoing terminal group 430 can be effectively increased, interference between the first outgoing terminal group 330 and the second outgoing terminal group 430 is reduced, return loss generated between the first outgoing terminal group 330 and the second outgoing terminal group 430 is suppressed, transmission quality of signals is improved, and performance of the transformer is improved.

Optionally, an absolute value of an included angle formed by projecting the first connecting line and the second connecting line on a plane perpendicular to the central axis of the toroidal core 200 is greater than or equal to 165 degrees and less than or equal to 195 degrees. Specifically, the angle may be 165 degrees, 170 degrees, 172 degrees, or 185 degrees, which is not particularly limited herein.

Optionally, an absolute value of an included angle formed by projecting the first connecting line and the second connecting line on a plane perpendicular to the central axis of the toroidal core 200 is greater than or equal to 175 degrees and less than or equal to 195 degrees. Specifically, 175 degrees, 176 degrees, 177 degrees, 178 degrees, 179 degrees, 180 degrees, 181 degrees, 182 degrees, 183 degrees, 184 degrees, or 185 degrees may be used.

In an alternative embodiment, an absolute value of an angle formed by a projection of a line connecting the input end 310 of the first signal coil 300 and the central axis of the annular magnetic core 200 and a projection of a line connecting the input end 410 of the second signal coil 400 and the central axis of the annular magnetic core 200 on a plane perpendicular to the central axis of the annular magnetic core 200 is greater than or equal to 157.5 degrees and less than or equal to 202.5 degrees. Specifically, the angle may be 157.5 degrees, 160 degrees, 170 degrees, 175 degrees, 180 degrees, 185 degrees, 190 degrees, or 202.5 degrees, which is not specifically limited herein.

In an alternative embodiment, an absolute value of an angle formed by a projection of a connection line between the output end 320 of the first signal coil 300 and the central axis of the annular magnetic core 200 and a projection of a connection line between the output end 420 of the second signal coil 400 and the central axis of the annular magnetic core 200 on a plane perpendicular to the central axis of the annular magnetic core 200 is greater than or equal to 157.5 degrees and less than or equal to 202.5 degrees. Specifically, the angle may be 157.5 degrees, 160 degrees, 170 degrees, 175 degrees, 180 degrees, 185 degrees, 190 degrees, or 202.5 degrees, which is not specifically limited herein.

In an alternative embodiment, a central line of a connecting line between the input end 310 and the output end 320 of the first signal coil 300 and the central axis of the annular magnetic core 200 is defined as a third connecting line, that is, the third connecting line is located between the connecting line between the input end 310 and the central axis of the annular magnetic core 200 and the connecting line between the output end 320 and the central axis of the annular magnetic core 200, and an included angle between the third connecting line and the third connecting line is the same as that between the third connecting line and the third connecting line, that is, the central line of a connecting line between the input end 410 and the central axis of the annular magnetic core 200 and between the output end 420 and the central axis of the annular magnetic core 200 is defined as a fourth connecting line, that is, an included angle between the fourth connecting line and the first connecting line is the same as that between the third connecting line and the fourth connecting line is greater than or equal to 157.5 degrees, and is less than or equal to 202.5 degrees. Specifically, the angle may be 157.5 degrees, 160 degrees, 170 degrees, 175 degrees, 180 degrees, 185 degrees, 190 degrees, or 202.5 degrees, which is not specifically limited herein.

In an embodiment, the first pattern part 130, the second pattern part 140 and the conductive via 150 are all conductors. Can be used for transmitting electric signals such as current.

As shown in fig. 3, the first signal coil 300 and the second signal coil 400 are interleaved on the toroidal core 200.

In one embodiment, the first signal coil 300 and the second signal coil 400 have the same current direction in the toroidal core 200. Specifically, the current direction is the overall winding direction of the currents of the first signal coil 300 and the second signal coil 400 around the toroidal core 200. Specifically, the directions may be both clockwise and counterclockwise.

And the included angle of the projection of the first connecting line and the second connecting line on the plane perpendicular to the central axis of the annular magnetic core 200 may be greater than or equal to 157.5 degrees and less than or equal to 202.5 degrees. Or the included angle of the projection of the first connecting line and the second connecting line on the plane perpendicular to the central axis of the toroidal core 200 may be greater than or equal to 337.5 degrees, less than or equal to 382.5 degrees, such as 340 degrees, 350 degrees, 360 degrees, and so on.

In another embodiment, the first signal coil 300 and the second signal coil 400 have opposite current directions in the toroidal core 200. Specifically, the current direction is the overall winding direction of the currents of the first signal coil 300 and the second signal coil 400 around the toroidal core 200. Alternatively, the current direction of the first signal coil 300 may be a clockwise direction, and the current direction of the second signal coil 400 may be a counterclockwise direction. Or the current direction of the first signal coil 300 may be a counterclockwise direction and the current direction of the second signal coil 400 may be a clockwise direction. And the included angle of the projection of the first connecting line and the second connecting line on the plane perpendicular to the central axis of the ring-shaped magnetic core 200 may be greater than or equal to-202.5 degrees, less than or equal to-157.5 degrees, such as-170 degrees, -180 degrees, -190 degrees, and so on. Or the included angle of the projection of the first connecting line and the second connecting line on the plane perpendicular to the central axis of the toroidal core 200 may be greater than or equal to-382.5 degrees, less than or equal to-337.5 degrees, such as-360 degrees, -350 degrees, or-340 degrees, etc.

As shown in fig. 1, the transformer 10 further includes a first tap line 500 and a second tap line 600, the first tap line 500 is connected to the first signal coil 300 and includes a first tap end 510 led out from the first graph portion 130 or the second graph portion 140, the second tap line 600 is connected to the second signal coil 400 and includes a second tap end 610 led out from the first graph portion 130 or the second graph portion 140, a connection line between the first tap end 510 and the central axis of the toroidal core 200 is defined as a fifth connection line, a connection line between the second tap end 610 and the central axis of the toroidal core 200 is defined as a sixth connection line, and an absolute value of an included angle projected by the fifth connection line and the sixth connection line on a plane perpendicular to the central axis of the toroidal core 200 is greater than or equal to 157.5 degrees and less than or equal to 202.5 degrees.

In the above embodiment, by defining a connection line between the first tap end 510 and the central axis of the ring-shaped magnetic core 200 as a fifth connection line, defining a connection line between the second tap end 610 and the central axis of the ring-shaped magnetic core 200 as a sixth connection line, and defining an absolute value of an included angle formed by projection of the fifth connection line and the sixth connection line on a plane perpendicular to the central axis of the ring-shaped magnetic core 200 to be greater than or equal to 157.5 degrees and less than or equal to 202.5 degrees, interference between the first tap end 510 and the second tap end 610 can be reduced.

Each of the first pattern part 130 and the second pattern part 140 includes a plurality of first conductive patterns 311 and a plurality of second conductive patterns 411 alternately arranged along a circumferential direction of the toroidal core 200. That is, the first pattern part 130 includes a plurality of first conductive patterns 311 and a plurality of second conductive patterns 411 alternately arranged along the circumferential direction of the toroidal core 200, and the second pattern part 140 also includes a plurality of first conductive patterns 311 and a plurality of second conductive patterns 411 alternately arranged along the circumferential direction of the toroidal core 200.

Optionally, the first signal coil 300 includes a first conductive pattern 311, and the second signal coil 400 includes a second conductive pattern 411, that is, the first signal coil 300 forms the first conductive pattern 311, and the second signal coil 400 forms the second conductive pattern 411.

At positions at a predetermined distance or range from the central axis of the toroidal core 200, at least a portion of the second conductive line patterns 411 are not equally spaced from two adjacent first conductive line patterns 311 in two opposite directions, respectively, that is, for two adjacent first conductive line patterns 311, the spacing between different first conductive line patterns 311 and the second conductive line pattern 411 in the middle of the two first conductive line patterns 311 is different.

Specifically, the pitches of all the second conductive line patterns 411 and two adjacent first conductive line patterns 311 in two opposite directions may not be equal, or the pitches of some second conductive line patterns 411 and two adjacent first conductive line patterns 311 in two opposite directions may not be equal.

In an alternative embodiment, the pitch between each first conductive line pattern 311 and the adjacent two second conductive line patterns 411 is the same, or may be different, and is not limited herein.

In a specific embodiment, since the plurality of first conductive line patterns 311 and the plurality of second conductive line patterns 411 are alternately arranged, two adjacent second conductive line patterns 411 are included for one first conductive line pattern 311 of two adjacent first conductive line patterns 311, and optionally, the pitch of one first conductive line pattern 311 and two adjacent second conductive line patterns 411 is the same at a position having a preset distance or range from the central axis of the toroidal core 200. Similarly, the pitch of the other first conductive line pattern 311 of the two adjacent first conductive line patterns 311 and the two adjacent second conductive line patterns 411 at a predetermined distance or range from the central axis of the toroidal core 200 is also the same, but the pitch of the one first conductive line pattern 311 and the adjacent second conductive line pattern 411 is different from the pitch of the other first conductive line pattern 311 and the adjacent second conductive line pattern 411.

As shown in fig. 4 and 5, the first conductive line pattern 411 has a first pitch D1 from one 311 of two first conductive line patterns 311 adjacent in two opposite directions, and the second conductive line pattern 411 has a second pitch D2 from the other 311 of the two first conductive line patterns 311 adjacent in two opposite directions. That is, a distance between one first conductive line pattern 311 and two adjacent second conductive line patterns 411 in two adjacent first conductive line patterns 311 is a first distance D1, and a distance between the other first conductive line pattern 311 and two adjacent second conductive line patterns 411 in two adjacent first conductive line patterns 311 is a second distance D2, the first distance D1 is not equal to the second distance D2.

In an embodiment, for the second conductive line pattern 411 located between two adjacent first conductive line patterns 311 and spaced apart from one first conductive line pattern 311 by a first distance D1 and spaced apart from the other first conductive line pattern 311 by a second distance D2, the magnitude and distance of the parasitic capacitance between the second conductive line pattern 411 and the first conductive line pattern 311 are related. The parasitic capacitance between the second conductive line pattern 411 and two adjacent first conductive line patterns 311 can be expressed as K/[ (D1 × D2)/(D1 + D2) ], where K represents other parameter values. When D1+ D2 is a fixed value, D1= D2 can minimize the value of the whole [ (D1 × D2)/(D1 + D2) ] and further maximize the whole parasitic capacitance, so that by setting D1 not equal to D2, the parasitic capacitance can be effectively reduced.

As shown in fig. 4, for another second conductive line pattern 411, the distance between the second conductive line pattern 411 and the adjacent first conductive line pattern 311 on one side is a first distance D3, the distance between the second conductive line pattern 411 and the adjacent first conductive line pattern 311 on the other side is a first distance D4, and the first distance D3 is not equal to the second distance D4. That is, for the other two adjacent first conductive line patterns 311, the distance between one first conductive line pattern 311 and the two adjacent second conductive line patterns 411 is the first distance D3, the distance between the other first conductive line pattern 311 and the two adjacent second conductive line patterns 411 is the second distance D4, and the first distance D3 is not equal to the second distance D4. Alternatively, the first distance D1 may be equal to the first distance D3, and the second distance D2 may be equal to the second distance D4. In another embodiment, the first distance D1, the second distance D2, the first distance D3 and the second distance D4 may be different from each other. Are not limited herein.

In the above embodiment, the distances between the second conductive line pattern 411 and the two adjacent first conductive line patterns 311 in two opposite directions are not equal, so that the overall parasitic capacitance between the first conductive line pattern 311 and the second conductive line pattern 411 in the whole transformer 10 can be effectively reduced, and the interference caused by the parasitic capacitance to the signals transmitted on the first signal coil 300 and the second signal coil 400 can be further reduced.

Optionally, at a position away from the central axis of the annular magnetic core 200 by a predetermined distance or a predetermined distance range, specifically, at a central position between the inner ring and the outer ring of the annular magnetic core 200, a difference between the first distance D1 and the second distance D2 is greater than or equal to 5um. Specifically, it may be 5um,6um or other values, and is not particularly limited herein.

Alternatively, the pitch between the first conductor pattern 311 and the adjacent two second conductor patterns 411 is kept equal in the radial direction between the inner ring and the outer ring of the toroidal core 200. That is, between the inner ring and the outer ring of the toroidal core 200, the pitches of the first conductive line pattern 311 and the adjacent two second conductive line patterns 411 are always equal in the radial direction for the same first conductive line pattern 311.

In another specific embodiment, the distance between the first conductive line pattern 311 and the two adjacent second conductive line patterns 411 gradually increases in the radial direction in the direction from the inner ring toward the outer ring of the toroidal core 200. That is, in the inner ring direction away from the ring-shaped magnetic core 200, for the same first conductive line pattern 311, the distance between the first conductive line pattern 311 and the two adjacent second conductive line patterns 411 is gradually increased in the radial direction.

In another specific embodiment, for the same first conductive line pattern 311, a plurality of continuous ranges may be provided in the direction of the inner ring of the ring-shaped magnetic core 200 toward the outer ring, and the spacing between the first conductive line pattern 311 and two adjacent second conductive line patterns 411 may be equal in the same range, but the spacing between the first conductive line pattern 311 and two adjacent second conductive line patterns 411 is increased in the direction of the inner ring of the ring-shaped magnetic core 200 toward the outer ring.

In an embodiment, the ring-shaped magnetic core 200 may be specifically a circular ring-shaped magnetic core, an elliptical ring-shaped magnetic core, a square ring-shaped magnetic core, or another polygonal ring-shaped magnetic core, which is not limited herein.

In an embodiment, the circuit board 100 specifically includes a central portion 160, an outer peripheral portion 170, and a ring-shaped receiving groove 180. The annular receiving groove 180 is specifically disposed between the central portion 160 and the outer peripheral portion 170. The center portion 160 is specifically provided with a plurality of inner via holes 161 penetrating through the first layer 110 and the second layer 120 of the circuit board 100; the periphery 170 defines a plurality of outer vias 171 that extend through the first layer 110 and the second layer 120 of the circuit board 100.

The annular magnetic core 200 is disposed in the annular receiving groove 180, and optionally, a central channel of the annular magnetic core 200 corresponds to the central portion 160 of the circuit board 100, and the conductive vias 150 are disposed in the inner through holes 161 and the outer through holes 171. Specifically, the via 150 may be formed by plating copper in the inner via 161 and the outer via 171.

The present invention also provides an electromagnetic device comprising a transformer 10 as described in any of the embodiments above.

In summary, the input end 310 and the output end 320 of the first signal coil 300 are used as the first lead-out terminal group 330, the input end 410 and the output end 420 of the second signal coil 400 are used as the second lead-out terminal group 430, a connection line between the first lead-out terminal group 330 and the central axis of the ring-shaped magnetic core 200 is defined as a first connection line, a connection line between the second lead-out terminal group 430 and the central axis of the ring-shaped magnetic core 200 is defined as a second connection line, and an absolute value of an included angle projected by the first connection line and the second connection line on a plane perpendicular to the central axis of the ring-shaped magnetic core 200 is greater than or equal to 157.5 degrees and less than or equal to 202.5 degrees, so that a distance between the first lead-out terminal group 330 and the second lead-out terminal group 430 can be effectively increased, interference between the first lead-out terminal group 330 and the second lead-out terminal group 430 is reduced, return loss is suppressed, transmission quality of signals is improved, and performance of the transformer is improved.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (12)

1. A transformer, comprising:

a circuit board including at least a first layer and a second layer which are stacked;

the annular magnetic core is embedded in the circuit board;

the first signal coil and the second signal coil are wound on the annular magnetic core;

the first signal coil and the second signal coil comprise a first graph part formed on a first layer of the circuit board, a second graph part formed on a second layer of the circuit board and a conducting column connecting the first graph part and the second graph part, input ends and output ends of the first signal coil and the second signal coil are led out from the first graph part and/or the second graph part, a connecting line between the input end and the output end of the first signal coil and a central axis of the annular magnetic core is defined as a first connecting line, a connecting line between the input end and the output end of the second signal coil and the central axis of the annular magnetic core is defined as a second connecting line, and an absolute value of an included angle projected by the first connecting line and the second connecting line on a plane perpendicular to the central axis of the annular magnetic core is larger than or equal to 157.5 degrees and smaller than or equal to 202.5 degrees.

2. The transformer of claim 1, wherein an absolute value of an included angle between projections of the first wire and the second wire on a plane perpendicular to the central axis of the toroidal core is 165 degrees or more and 195 degrees or less.

3. The transformer of claim 2, wherein an absolute value of an included angle of projections of the first wire and the second wire on a plane perpendicular to the central axis of the toroidal core is greater than or equal to 175 degrees and less than or equal to 185 degrees.

4. The transformer of claim 1,

the absolute value of the projection included angle of the connecting line of the input end of the first signal coil and the central axis of the annular magnetic core and the connecting line of the input end of the second signal coil and the central axis of the annular magnetic core on a plane perpendicular to the central axis of the annular magnetic core is larger than or equal to 157.5 degrees and smaller than or equal to 202.5 degrees; and/or

The absolute value of an included angle projected by a connecting line of the output end of the first signal coil and the central axis of the annular magnetic core and a connecting line of the output end of the second signal coil and the central axis of the annular magnetic core on a plane perpendicular to the central axis of the annular magnetic core is greater than or equal to 157.5 degrees and less than or equal to 202.5 degrees; and/or

The input end and the output end of the first signal coil are defined to be respectively connected with a central line of a connecting line of a central axis of the annular magnetic core to form a third connecting line, the input end and the output end of the second signal coil are defined to be respectively connected with a central line of a connecting line of a central axis of the annular magnetic core to form a fourth connecting line, and the absolute value of an included angle formed by projecting the third connecting line and the fourth connecting line on a plane perpendicular to the central axis of the annular magnetic core is greater than or equal to 157.5 degrees and smaller than or equal to 202.5 degrees.

5. The transformer of claim 1, wherein the first pattern, the second pattern, and the via are all conductors.

6. The transformer of claim 1, further comprising a first tap line and a second tap line, wherein the first tap line is connected to the first signal coil and includes a first tap end led out from the first pattern part or the second pattern part, the second tap line is connected to the second signal coil and includes a second tap end led out from the first pattern part or the second pattern part, a connection line between the first tap end and the central axis of the toroidal core is defined as a fifth connection line, a connection line between the second tap end and the central axis of the toroidal core is defined as a sixth connection line, and an absolute value of an included angle projected by the fifth connection line and the sixth connection line on a plane perpendicular to the central axis of the toroidal core is greater than or equal to 157.5 degrees and less than or equal to 202.5 degrees.

7. The transformer of claim 1, wherein the first pattern part and the second pattern part each include a plurality of first conductive patterns and a plurality of second conductive patterns alternately arranged in a circumferential direction of the toroidal core;

wherein the first signal coil comprises a first conductive pattern;

the second signal coil includes a second conductive pattern;

at least part of the second wire patterns are not equal to the distances between two adjacent first wire patterns in two opposite directions at the position which is away from the central axis of the annular magnetic core by a preset distance or a preset distance range.

8. The transformer of claim 7,

at a position which is away from the central axis of the annular magnetic core by a preset distance or a preset distance range, the first wire pattern has a first distance from one of two adjacent first wire patterns in two opposite directions, and has a second distance from the other of the two adjacent first wire patterns in two opposite directions;

the difference between the first spacing and the second spacing is greater than or equal to 5um.

9. The transformer of claim 7,

the distance between the first conducting wire pattern and the adjacent two second conducting wire patterns is kept equal along the radial direction between the inner ring and the outer ring of the annular magnetic core; or

In the direction of the inner ring of the annular magnetic core towards the outer ring, the distance between the first wire pattern and two adjacent second wire patterns is gradually increased along the radial direction.

10. The transformer of claim 1, wherein the circuit board comprises:

a central portion provided with a plurality of inner via holes penetrating through a first layer and a second layer of the circuit board;

the peripheral part is provided with a plurality of outer conducting holes penetrating through the first layer and the second layer of the circuit board;

and the annular accommodating groove is arranged between the central part and the peripheral part.

11. The transformer of claim 10, wherein the annular magnetic core is disposed in the annular receiving slot, and the conductive via is disposed in the inner and outer conductive vias.

12. An electromagnetic device, characterized in that it comprises a transformer according to any one of claims 1-11.

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