CN216648029U - Pulse transformer - Google Patents

Abstract

The utility model discloses a pulse transformer, and a winding magnetic core body comprises: a column portion magnetic core; a first magnetic circuit core and a second magnetic circuit core connected to both ends of the columnar portion core, respectively; a plurality of winding coils wound around the magnetic core of the columnar portion and connected to the electrodes; the electrode ends of the first and second magnetic circuit magnetic cores are provided with electrodes the number of which is matched with the number of the winding coils, and the two ends of each winding coil are respectively connected with the electrodes on the first and second magnetic circuit magnetic cores; one sides of the first magnetic circuit magnetic core and the second magnetic circuit magnetic core facing the columnar part magnetic core are set to be inclined planes, and two ends of the winding coil climb to the electrode end along the inclined planes; the electrode is provided with an arc-shaped arc groove, the arc groove extends from the end face of the electrode to the side face of the electrode, and the cross section of the arc groove is arc-shaped; one set of opposite faces of the columnar portion magnetic core is set to a smooth arc face. The utility model can effectively reduce the occurrence of failure caused by the damage of the winding coil.

Description

Pulse transformer

Technical Field

The utility model belongs to the technical field of communication equipment, and particularly relates to a pulse transformer.

Background

The patch pulse transformer is mainly used in communication equipment, for example: the network switch, the router, the server, the mainboard, the network set-top box, the intelligent television, the network camera and the like mainly play roles in signal coupling, impedance matching, high-voltage isolation and the like.

At present, some manufacturers have realized the automatic production of the micro pulse transformer, but in the actual production process, because of the limitation of the device geometric characteristics and the automatic production equipment, the reliability of the winding coil and the electrical performance of the final product cannot be effectively guaranteed, so that the qualification rate of the product is low, the reliability is poor, and finally the production cost is further improved.

For the aspect to which the utility model applies: when the coil was at the column part coiling of wire winding magnetic core body, the coil often can be through comparatively sharp edges and corners, because the size of coil itself is less, the line footpath is thinner, so the insulating paint layer of parcel is thinner on the enameled wire, and is easy to damage very much, and coil itself also is easy to be destroyed by edges and corners, leads to the coil to lose original function, and the easy short circuit between the winding and withstand voltage between primary coil and the secondary coil are relatively poor, finally leads to pulse transformer's electrical function to become invalid. In addition, the winding window of the traditional pulse transformer is mostly of a rectangular structure, and the stress of the winding is mainly concentrated on four endpoints of the rectangle in the automatic winding process, so that the winding at the endpoints is subjected to large stress, and the pulse transformer is easy to damage or break down, so that the pulse transformer fails.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model provides the pulse transformer which can effectively reduce the occurrence of failure caused by the damage of a winding coil.

The technical scheme adopted by the utility model is as follows:

a pulse transformer comprises a wound magnetic core body and a magnetic core top cover;

the wire-wound magnetic core body includes: a column portion magnetic core; a first magnetic circuit core and a second magnetic circuit core connected to both ends of the columnar portion core, respectively; a plurality of winding coils wound around the magnetic core of the columnar portion and connected to the electrodes;

the electrode ends of the first magnetic circuit magnetic core and the second magnetic circuit magnetic core are provided with electrodes the number of which is matched with the number of the winding coils, and the two ends of each winding coil are respectively connected with the electrodes on the first magnetic circuit magnetic core and the second magnetic circuit magnetic core; one sides of the first magnetic circuit magnetic core and the second magnetic circuit magnetic core facing the columnar part magnetic core are set to be inclined planes, and two ends of the winding coil climb to the electrode end along the inclined planes; the electrode is provided with an arc-shaped arc groove, the arc groove extends from the end face of the electrode to the side face of the electrode, and the cross section of the arc groove is arc-shaped;

a group of opposite surfaces of the columnar part magnetic core are provided with smooth cambered surfaces;

the magnetic core top cap is connected with first magnetic circuit magnetic core and second magnetic circuit magnetic core.

Preferably, the cambered surface on the magnetic core of the columnar part is an elliptical cambered surface.

Preferably, the other pair of paired surfaces of the magnetic core of the columnar part is set as a plane, and the junction of the elliptic arc surface and the plane adopts an arc surface for transition.

Preferably, the semimajor axis of the ellipse corresponding to the elliptical arc surface ranges from 0.8 mm to 1.5mm, and the semiminor axis ranges from 0.2 mm to 0.6 mm.

Preferably, the electrode comprises a convex pad structure, an electrode layer is arranged on the surface of the pad structure, and two ends of the winding coil are welded with the electrode layer.

Preferably, the lower edge of the inclined surface is a circular arc surface.

Preferably, the winding coils include a first winding coil, a second winding coil, a third winding coil and a fourth winding coil;

the first winding coil and the second winding coil are wound on the cylindrical part magnetic core, and the first winding coil and the second winding coil are wound in the same winding direction and alternately;

the third winding coil and the fourth winding coil are wound on the outer layers of the first winding coil and the second winding coil, and the third winding coil and the fourth winding coil are wound in the same winding direction and alternately;

the winding directions of the first winding coil and the second winding coil are opposite to the winding directions of the third winding coil and the fourth winding coil.

Preferably, the electrodes include a first electrode, a second electrode, a third electrode, a fourth electrode, a fifth electrode, a sixth electrode and a seventh electrode, the first electrode, the second electrode, the third electrode and the fourth electrode are disposed at an electrode end of the first magnetic core, the fifth electrode, the sixth electrode and the seventh electrode are disposed at the second magnetic core, one end of the first winding coil, one end of the second winding coil, one end of the third winding coil and one end of the fourth winding coil are connected to the second electrode, the fourth electrode, the third electrode and the first electrode, the other end of the second winding coil and the other end of the third winding coil are connected to the seventh electrode and the sixth electrode, and the other end of the first winding coil and the other end of the fourth winding coil are connected to the fifth electrode.

Preferably, the first electrode and the second electrode are arranged at one end of the first magnetic circuit core, and the third electrode and the fourth electrode are arranged at the other end of the first magnetic circuit core; the first electrode and the fourth electrode are arranged on one side close to the magnetic core of the columnar part, the second electrode and the third electrode are arranged on one side far away from the magnetic core of the columnar part, a groove for prolonging the creepage distance of the safety regulation is arranged between the first electrode and the second electrode, a groove for prolonging the creepage distance of the safety regulation is arranged between the third electrode and the fourth electrode, and a groove for prolonging the creepage distance of the safety regulation is arranged between the second electrode and the third electrode;

the sixth electrode and the seventh electrode are arranged at one end of the second magnetic circuit magnetic core, the sixth electrode is arranged at one side close to the magnetic core of the columnar part, the seventh electrode is arranged at one side far away from the magnetic core of the columnar part, the fifth electrode is arranged at the other end of the second magnetic circuit magnetic core, a groove used for prolonging the creepage distance of the safety gauge is arranged between the sixth electrode and the seventh electrode, and grooves used for prolonging the creepage distance of the safety gauge are arranged between the fifth electrode and the seventh electrode and between the fifth electrode and the sixth electrode.

From the above scheme, the utility model has the following advantages:

the pulse transformer has the advantages of simple structure, low difficulty in automatic production, no possibility of the coil passing through sharp edges and corners in the winding process and in the leading-out process, no suspension state of a lead, small deformation space of the coil, uniform stress of a winding and great improvement on the reliability of a finished device.

Drawings

In order to more clearly present the technical solution of the present invention, the structure related to the description will be illustrated in the drawings, and the subsequent drawings are only part of the presented solutions.

FIG. 1 is a top perspective view of one embodiment of the present invention;

FIG. 2 is a top cover design of a magnetic core in a pulse transformer structure according to the present invention;

FIG. 3 illustrates a magnetic core body portion of a pulse transformer configuration according to the present invention;

FIG. 4 is a cross-section of a cylindrical magnetic core in a pulse transformer configuration according to the present invention;

FIG. 5 is the overall structure diagram of the pulse transformer after the coil winding is completed;

FIG. 6 is a connection diagram of four groups of windings and each electrode terminal after the pulse transformer finishes winding the coil;

FIG. 7 is a cross-sectional view of a wound coil of the present invention;

FIG. 8 is an electrical connection diagram of the finished pulse transformer of the present invention;

fig. 9 is a perspective view of the pulse transformer of the present invention.

In the figure, 1-magnetic core top cover, 2-first magnetic circuit magnetic core, 3-column part magnetic core, 4-second magnetic circuit magnetic core, P1-first electrode, P2-second electrode, P3-third electrode, P4-fourth electrode, P5-fifth electrode, P6-sixth electrode, P7-seventh electrode, w 1-first winding coil, w 2-second winding coil, w 3-third winding coil, w 4-fourth winding coil, 5-groove, 6-arc groove and 7-inclined plane.

Detailed Description

In order to make the utility model more concise, it will be further described with reference to the accompanying drawings, in which some embodiments are described below. All other structures that can be obtained by a person skilled in the art without any inventive step based on the design idea in this patent are within the scope of protection of this patent.

In order to make the relevant designers better understand the design scheme of the present invention, the present invention is further described in detail below with reference to the structure of the pulse transformer, the drawings and the specific design scheme.

Referring to fig. 1 to 9, the pulse transformer of the present invention mainly includes: a winding magnetic core body and a magnetic core top cover 1; the winding magnetic core body mainly comprises a columnar part magnetic core 3 for winding a coil, a first magnetic circuit magnetic core (2) and a second magnetic circuit magnetic core (4) which are connected with the columnar part magnetic core and provided with electrode ends, and four winding coils which are wound on the columnar part magnetic core 3 and connected with the electrodes; magnetic core top cap 1 in this pulse transformer structure is a cuboid magnetic core, and the material is ferrite material, and mainly used seals the magnetic circuit, improves the electrical property of finished product device to and act as a function of some protection coil. The winding magnetic core body in the pulse transformer structure is integrally an I-shaped magnetic core, the material of the winding magnetic core body is consistent with that of the magnetic core top cover 1, the winding magnetic core body and the magnetic core top cover 1 are bonded together through a magnetic core adhesive, and the thickness of the adhesive in the finished product is preferably 50-80 microns. The pulse transformer winding magnetic core body mainly comprises two parts: a cylindrical part magnetic core 3 having an elliptic arc surface, and first and second magnetic circuit magnetic cores 2 and 4 having electrode parts. The columnar part magnetic core 3 is of a cuboid structure in the existing design, the section of a winding is rectangular, and a chamfer is additionally arranged on the structure in part of the design to reduce the abrasion of the coil in the winding process so as to improve the qualification rate of finished products and the reliability of devices. However, in the present invention, the rectangular parallelepiped structure is optimized to be a columnar structure with elliptical arc surfaces on the upper and lower surfaces, the cross section of the winding window is shown in fig. 4, the semi-major axis of the rectangular parallelepiped structure is 0.8 to 1.5mm, and the semi-minor axis of the elliptical arc surface is 0.2 to 0.6 mm. And the edges of the upper elliptic cambered surface, the lower elliptic cambered surface and the rectangular winding surfaces at the two sides are provided with circular arc transitions, so that the adhesion degree of the winding and the winding surface and the reliability of the winding are greatly improved. The coil winding process is guaranteed not to be well attached to the magnetic core body through sharp edges and corners, and winding stress is uniform in the winding process, so that reliability of the coil in the winding process is guaranteed, and reliability of a final product is improved.

At the electrode end of the first and second magnetic circuit cores (2, 4), most of the existing device designs simply design the positions of a plurality of electrodes or add circular arcs or inclined planes on the electrodes to guide the coils to be wound smoothly, for example: patent (CN 201520193604). However, due to the limitations of device size and automation technology, the difficulty achieved in the actual production process is often large. Therefore, in the utility model, the arc and the electrode are directly connected through the inclined plane, the processing difficulty is reduced, meanwhile, the situation that the enameled wire is suspended in the process of leading to the electrode can be ensured, the deformable space of the enameled wire is reduced, and the situation that the lead is broken due to the fact that the enameled wire is subjected to larger deformation caused by larger external force in the actual processing process is avoided. Bosses are arranged at the electrode ends of the first magnetic circuit magnetic core (2) and the second magnetic circuit magnetic core (4), the bosses are used as pad structures, and the bosses are provided with electrodes the number of which is matched with the number of the windings. An electrode layer (100-.

Two inclined planes are arranged between the electrode end of the winding magnetic core body and the winding oval arc surface, so that the winding wire climbs to the electrode end along the inclined planes, and the reliability of the pulse transformer is improved. Add the round chamfer at the 7 edges on the inclined plane of column part magnetic core and electrode part magnetic core, make the wire winding climb to the electrode tip along the inclined plane through the arc surface, avoid the coil to draw the in-process through sharp edges and corners, increase the reliability of winding to reach the purpose the same with above-mentioned oval cambered surface.

Referring to fig. 7, when the coil is wound on the columnar part of the winding magnetic core body, the four winding coils are wound in an upper layer and a lower layer, and the directions of the upper layer and the lower layer of winding coils are opposite, so that the condition that the four winding coils are wound in the same direction can not occur when the winding starts and ends, and the purpose is to reduce the production difficulty in automatic production. The head and tail parts of the wound coil are respectively arranged on the two electrode parts so as to ensure that the function of the finished device can be normal.

All there is fluted design between the adjacent electrode tip, and this design can prevent to weld between the two adjacent electrode tips and switch on even, still can strengthen the ann rule creepage distance between the adjacent pad in addition.

Arc grooves are formed in the end face and the side face of part of the electrode of the magnetic circuit magnetic core, and the tail end of the winding rises to the end face of the electrode along the arc grooves, so that the winding is prevented from being damaged in the wiring process.

Examples

As shown in fig. 1, fig. 2, fig. 5, fig. 6 and fig. 9, the pulse transformer structure of the present embodiment includes: a wound core body (a combination of the first magnetic path core 2, the columnar portion core 3, and the second magnetic path core 4) and a core top cover 1; the winding magnetic core body mainly comprises a columnar part magnetic core 3 for winding a coil, a first magnetic circuit magnetic core 2 connected with the columnar part magnetic core and provided with an electrode end, and a second magnetic circuit magnetic core 4.

As shown in fig. 3, seven electrodes (a first electrode P1, a second electrode P2, a third electrode P3, a fourth electrode P4, a fifth electrode P5, a sixth electrode P6 and a seventh electrode P7 are disposed on a winding core body of a pulse transformer core structure, wherein 4 electrodes (a first electrode P1, a second electrode P2, a third electrode P3 and a fourth electrode P4 are disposed on a first magnetic core 2, 3 electrodes (a fifth electrode P5, a sixth electrode P6 and a seventh electrode P7) are disposed on a second magnetic core 4, a groove 5 is disposed between the first electrode P1 and the second electrode P2, between the third electrode P3 and the fourth electrode P4, and between the sixth electrode P6 and the seventh electrode P7, and this design can prevent the connection pad between two adjacent electrode ends and further enhance the safety creepage distance between adjacent electrodes.

From fig. 3, set up two inclined planes 7 on first magnetic circuit magnetic core 2 and second magnetic circuit magnetic core 4, inclined plane 7 effect is the great unsettled state of degree can not appear in the assurance winding when leading to the electrode to reduce the deformation scope of lead wire when receiving external force, guarantee the stability of electrode connection coil when receiving external force, can guarantee the reliability of final device when receiving external force and act on.

If this inclined plane is not designed, accomplish the coiling at the coil from the column part magnetic core 3 and lead to second electrode P2, third electrode P3, fifth electrode P5, when sixth electrode P6, according to design size's restriction, the difference in height about 0.25 millimeter can appear, and the diameter of the enameled wire that coil itself selected is only tens of microns, if receive when external force effect takes place great deformation, this unsettled space is enough to make the lead wire break, consequently need set up corresponding slope lug connection electrode and transition fillet, guarantee that the coil does not have great deformation space with this, the prevention breaks after taking place great deformation when receiving external force.

As can be seen from fig. 3 and 9, two arc surfaces are disposed on the magnetic core 3 of the column portion, respectively disposed on the electrode side and the top cover side of the magnetic core; meanwhile, an arc edge is arranged at the joint of the inclined plane and the arc surface; the coil winding device has the function of ensuring that the original insulating paint is not abraded or the coil is broken because the coil passes through sharp edges and corners in the coil winding process, so that the reliability of the electrical performance of the device is ensured.

In particular, if the magnetic core of the column part is a straight quadrangular prism or a straight octagonal prism, the coil needs to pass through four edges of 90 degrees or 8 edges of 135 degrees in the winding process, and the thickness of the enamel layer can be only about a few microns due to the size limitation of the coil, so that the enamel layer is likely to be abraded to a greater extent at the edges; the enameled wire of the pulse transformer has the diameter of only dozens of micrometers, and can be directly broken when the enameled layer is not protected or a large external force is applied during automatic production.

As shown in fig. 3, 6, 7 and 9, four winding coils, namely a first winding coil w1, a second winding coil w2, a third winding coil w3 and a fourth winding coil w4 are wound on the columnar part magnetic core of the pulse transformer; two electrodes (a first electrode P2 and a fifth electrode P5) are connected to the first winding coil w1, two electrodes (a fourth electrode P4 and a seventh electrode P7) are connected to the second winding coil w2, two electrodes (a third electrode P3 and a sixth electrode P6) are connected to the third winding coil w3, and two electrodes (a first electrode P1 and a fifth electrode P5) are connected to the fourth winding coil w 4. The first electrode P1 and the second electrode P2 are disposed at one end of the first magnetic-circuit core 2, and the third electrode P3 and the fourth electrode P4 are disposed at the other end of the first magnetic-circuit core 2; the first electrode P1 and the fourth electrode P4 are arranged on one side close to the columnar part magnetic core 3, the second electrode P2 and the third electrode P3 are arranged on one side far away from the columnar part magnetic core 3, a groove 5 for prolonging the safety-regulation creepage distance is arranged between the first electrode P1 and the second electrode P2, a groove 5 for prolonging the safety-regulation creepage distance is arranged between the third electrode P3 and the fourth electrode P4, and a groove 5 for prolonging the safety-regulation creepage distance is arranged between the second electrode P2 and the third electrode P3; the sixth electrode P6 and the seventh electrode P7 are disposed at one end of the second magnetic circuit core 4, the sixth electrode P6 is disposed at a side close to the column-shaped portion core 3, the seventh electrode P7 is disposed at a side far from the column-shaped portion core 3, the fifth electrode P5 is disposed at the other end of the second magnetic circuit core 4, a groove 5 for extending the ampere-gauge creepage distance is provided between the sixth electrode P6 and the seventh electrode P7, and grooves 5 for extending the ampere-gauge creepage distance are provided between the fifth electrode P5 and the seventh electrode P7 and between the fifth electrode P6.

When the coil is wound, as shown in fig. 7, the coil may be wound in such a manner that the first winding coil w1 and the second winding coil w2 are wound side by side, the third winding coil w3 and the fourth winding coil w4 are wound side by side, and the final arrangement is completed in two layers, correspondingly, if the coil is wound in multiple layers, the number of winding turns of the first layer coil and the second layer coil may be inconsistent, and the number of turns of the bottom layer coil is always one to two more than the number of turns of the outer layer coil. The coil may be wound in four layers, with the first winding w1 in the first layer, the second winding w2 in the second layer, the third winding w3 in the third layer, and the fourth winding w4 in the fourth layer. Since the winding is very similar to the double layer winding, it will not be described in further detail here.

For the design scheme, firstly, the first winding coil w1 and the second winding coil w2 are wound on the columnar part magnetic core 3 counterclockwise and are connected to the second electrode P2, the fifth electrode P5, the fourth electrode P4 and the seventh electrode P7, and then, the third winding coil w3 and the fourth winding coil w4 are wound on the columnar part magnetic core clockwise (if the winding directions of the first winding coil w1 and the second winding coil w2 are clockwise, the winding directions of the third winding coil w3 and the fourth winding coil w4 are counterclockwise). The double-layer coil is reversely wound, so that the upper-layer coil is prevented from being continuously wound according to the gap after the lower-layer coil is wound in order to fix the position of the coil in the winding process, parasitic parameters caused by winding the coil can be reduced, and the final performance of the device is optimized. Of course, when winding the coil, the third winding coil w3 and the fourth winding coil w4 may be wound at the lowest layer at first, or the connection mode between the wound coil and the electrode is changed, and these similar design schemes are not described herein again.

It should be noted that, due to the arrangement of the electrode shape and the slope, when winding the coil, the coil is preferably divided into two groups according to the difference of the winding directions, and each group of two coils, and the difference of the winding directions can ensure that when the coil is led out from the magnetic core of the columnar part, four coils are not led out side by side, which can increase parasitic parameters to cause the final performance reduction of the device. The optimized design scheme is that the coils of the first electrode P1, the fourth electrode P4, the fifth electrode P5 and the seventh electrode P7 are directly led out from the columnar part magnetic core, and the winding part is directly led out from the inner side of the joint electrode part magnetic core. Because the coil is difficult to be directly fixed on the inner wall of the magnetic core at the leading-out position of the coil, the arc groove is added at the corresponding position of the electrode, so that the corresponding coil is easier to be fixed on the magnetic core, the difficulty of subsequent automatic production is reduced, and the production efficiency is improved.

Correspondingly, the corresponding coils of the second electrode P2, the third electrode P3 and the sixth electrode P6 should be led out through the round chamfer and the inclined plane after the winding is completed on the magnetic core of the columnar part, and then connected with the electrodes. And the round chamfers and the slopes mentioned in the utility model are fully utilized, so that the reliability of the coil in operation is ensured.

The utility model mainly aims at the elliptical arc surface, the round angle, the inclined surface and the electrode end in the design, the elliptical arc surface, the electrode end and the round angle are different from the design scheme of other people, and the design of the winding and the inclined surface can be mutually referred to the parts similar to other people.

The detailed description of the disclosed designs will enable one skilled in the art to make or use the same. The generic principles defined herein may be applied to other design concepts without departing from the scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. A pulse transformer is characterized by comprising a wound magnetic core body and a magnetic core top cover (1);

the wire-wound magnetic core body includes: a column portion magnetic core (3); a first magnetic circuit core (2) and a second magnetic circuit core (4) connected to both ends of the columnar portion core (3), respectively; a plurality of winding coils wound around the magnetic core (3) of the columnar portion and connected to the electrodes;

the electrode ends of the first magnetic circuit magnetic core (2) and the second magnetic circuit magnetic core (4) are provided with electrodes the number of which is matched with the number of the winding coils, and the two ends of each winding coil are respectively connected with the electrodes on the first magnetic circuit magnetic core (2) and the second magnetic circuit magnetic core (4); one sides of the first magnetic circuit magnetic core (2) and the second magnetic circuit magnetic core (4) facing the columnar part magnetic core (3) are set to be inclined planes (7), and two ends of the winding coil climb to electrode ends along the inclined planes (7); the electrode is provided with an arc-shaped arc groove (6), the arc groove (6) extends from the end face of the electrode to the side face of the electrode, and the cross section of the arc groove (6) is arc-shaped;

a group of opposite surfaces of the columnar part magnetic core (3) are set to be smooth cambered surfaces;

the magnetic core top cover (1) is connected with the first magnetic circuit magnetic core (2) and the second magnetic circuit magnetic core (4).

2. A pulse transformer according to claim 1, characterized in that the arc on the core (3) of the column part is an elliptical arc.

3. A pulse transformer according to claim 2, characterized in that the other pair of surfaces of the magnetic core (3) of the column part is a plane, and the junction between the elliptic arc surface and the plane is a circular arc surface.

4. A pulse transformer according to claim 2 or 3, characterized in that the semimajor axis of the ellipse corresponding to the arc of the ellipse is in the range of 0.8-1.5 mm and the semiminor axis thereof is in the range of 0.2-0.6 mm.

5. The pulse transformer according to claim 1, wherein the electrode comprises a convex pad structure, an electrode layer is provided on a surface of the pad structure, and both ends of the winding coil are welded to the electrode layer.

6. A pulse transformer according to claim 1, characterized in that the lower edge of the bevel (7) is provided as a circular arc.

7. A pulse transformer according to claim 1, characterized in that said winding coils comprise a first winding coil (w1), a second winding coil (w2), a third winding coil (w3) and a fourth winding coil (w 4);

the first winding coil (w1) and the second winding coil (w2) are wound on the columnar part magnetic core (3), and the first winding coil (w1) and the second winding coil (w2) are wound in the same winding direction and are wound at intervals;

the third winding coil (w3) and the fourth winding coil (w4) are wound on the outer layers of the first winding coil (w1) and the second winding coil (w2), and the third winding coil (w3) and the fourth winding coil (w4) are wound in the same winding direction and are wound at intervals;

the winding directions of the first winding coil (w1) and the second winding coil (w2) are opposite to the winding directions of the third winding coil (w3) and the fourth winding coil (w 4).

8. A pulse transformer according to claim 7, characterized in that said electrodes comprise a first electrode (P1), a second electrode (P2), a third electrode (P3), a fourth electrode (P4), a fifth electrode (P5), a sixth electrode (P6) and a seventh electrode (P7), the first electrode (P1), the second electrode (P2), the third electrode (P3) and the fourth electrode (P4) are arranged at the electrode end of the first magnetic core (2), the fifth electrode (P5), the sixth electrode (P6) and the seventh electrode (P7) are arranged at the second magnetic core (4), one end of the first winding coil (w1), the second winding coil (w2), the third winding coil (w3) and the fourth winding coil (w4) are connected to the second electrode (P2), the fourth electrode (P4), the third electrode (P3) and the first electrode (P468), the third electrode (P6478) and the seventh winding coil (P6865) are connected to the other end of the second electrode (P4972) and the seventh winding coil (P6855), respectively (P6), and the other ends of the first winding coil (w1) and the fourth winding coil (w4) are connected to the fifth electrode (P5).

9. A pulse transformer according to claim 8, characterized in that the first electrode (P1) and the second electrode (P2) are arranged at one end of the first magnetic core (2), and the third electrode (P3) and the fourth electrode (P4) are arranged at the other end of the first magnetic core (2); the first electrode (P1) and the fourth electrode (P4) are arranged on one side close to the columnar part magnetic core (3), the second electrode (P2) and the third electrode (P3) are arranged on one side far away from the columnar part magnetic core (3), a groove for prolonging the safety-gauge creepage distance is arranged between the first electrode (P1) and the second electrode (P2), a groove for prolonging the safety-gauge creepage distance is arranged between the third electrode (P3) and the fourth electrode (P4), and a groove for prolonging the safety-gauge creepage distance is arranged between the second electrode (P2) and the third electrode (P3);

the sixth electrode (P6) and the seventh electrode (P7) are arranged at one end of the second magnetic circuit magnetic core (4), the sixth electrode (P6) is arranged at one side close to the columnar part magnetic core (3), the seventh electrode (P7) is arranged at one side far away from the columnar part magnetic core (3), the fifth electrode (P5) is arranged at the other end of the second magnetic circuit magnetic core (4), a groove for prolonging the safety-regulation creepage distance is arranged between the sixth electrode (P6) and the seventh electrode (P7), and grooves for prolonging the safety-regulation creepage distance are arranged between the fifth electrode (P5) and the seventh electrode (P7) and between the fifth electrode (P3526) and the sixth electrode (P6).

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