Transformer and circuit board structure

Abstract

The utility model relates to a transformer and a circuit board structure. The transformer comprises a magnetic core and a conductive piece. The magnetic core comprises a base, a first protruding piece is arranged on the first surface of the base, and a groove is formed in the outer side of the first protruding piece. The conductive part is at least partially located in the groove and electrically connected with the first protruding part. When the transformer generates eddy current on the magnetic core due to change of magnetic flux, the eddy current can be led out from the conductive piece to eliminate extra current on the magnetic core, vibration of the magnetic core is avoided, and therefore noise is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a transformer and a circuit board structure. Background Art

[0002] A transformer is an electrical device used to change AC voltage. It uses the principle of electromagnetic induction to achieve voltage conversion between input and output. A transformer usually consists of two or more windings placed on a magnetic core. Depending on the turns ratio of the transformer (i.e. the ratio of the number of turns of the primary winding to the number of turns of the secondary winding), the input voltage can be increased or decreased to the desired output voltage level.

[0003] When the transformer is in operation, high-frequency electromagnetic wave noise will be generated on the magnetic core, making the transformer a noise signal source that radiates electromagnetic waves outward, causing adverse effects. Utility Model Content

[0004] Based on this, it is necessary to provide a transformer and circuit board structure to address the problem of noise radiation from the transformer.

[0005] In a first aspect, the present application provides a transformer, the transformer comprising: a magnetic core and a conductive member;

[0006] The magnetic core comprises a base, a first surface of the base is provided with a first protruding piece, and an outer side of the first protruding piece is provided with a groove;

[0007] The conductive element is at least partially located in the groove and is electrically connected to the first protruding element.

[0008] In one of the embodiments, the conductive member is at least partially fixed in the groove via a conductive connecting member.

[0009] In one embodiment, the conductive member has a bent portion, and the position of the conductive connecting member corresponds to the bent portion of the conductive member.

[0010] In one embodiment, the conductive connection member is located at an end of the groove.

[0011] In one embodiment, the conductive connecting member is a metal sheet, and the conductive member is fixed in the groove via the metal sheet.

[0012] In one embodiment, the groove is cylindrical or square.

[0013] In one of the embodiments, in the thickness direction of the first protruding member, the ratio of the depth of the groove to the thickness of the first protruding member is less than a preset ratio threshold.

[0014] In one embodiment, the length of the groove along the protruding direction of the first protruding member is smaller than that of the first protruding member.

[0015] In one embodiment, the first protruding member is provided with a first opening, and the groove is provided at a preset distance from the first opening.

[0016] In one embodiment, the transformer further comprises:

[0017] A fixing member is disposed at the first opening, wherein a first portion of the fixing member is located inside the first protruding member, and a second portion of the fixing member is located outside the first protruding member.

[0018] In one embodiment, the second portion of the fixing member is provided with a second opening, and one end of the conductive member is passed through the second opening.

[0019] In a second aspect, the present application further provides a transformer, comprising a first magnetic core, a second magnetic core and a conductive member.

[0020] A through groove is formed on the outer side of the first protruding piece of the first magnetic core. The conductive piece is at least partially located in the groove and abuts against the second protruding piece of the second magnetic core.

[0021] In one embodiment, the conductive member is at least partially fixed in the groove by a conductive connecting member, and the conductive connecting member is connected across the first magnetic core and the second magnetic core.

[0022] In a third aspect, the present application further provides a circuit board structure, the circuit board structure comprising:

[0023] A circuit board, provided with a first circuit and a second circuit, wherein the first circuit and / or the second circuit comprises a switch device;

[0024] The transformer is configured on the circuit board, and the first protrusion has a first accommodating space and a second accommodating space. The first accommodating space has a first winding, and the second accommodating space has a second winding. The first winding is electrically connected to the first circuit, and the second winding is electrically connected to the second circuit. The conductive member is electrically connected to the stable potential of the circuit board.

[0025] In one embodiment, the stable potential is a ground potential on the circuit board.

[0026] In one embodiment, the stable potential is any one of the following:

[0027] The positive or negative pole of the power supply in the first circuit;

[0028] The neutral or hot wire in the second circuit;

[0029] The intermediate potential formed by connecting the filter capacitors in the first circuit or the second circuit.

[0030] In the above transformer and circuit board structure, the transformer includes a magnetic core and a conductive part; a groove is opened on the magnetic core, and the conductive part is at least partially located in the groove and is electrically connected to the magnetic core. When the conductive part is connected to an external circuit to form a loop, the current generated on the transformer magnetic core is introduced into the circuit loop instead of existing in the form of eddy current, thereby eliminating the electromagnetic radiation of the magnetic core, reducing electromagnetic interference to other electronic equipment, and eliminating noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the transformer in the traditional technology;

[0032] Figure 2 is a schematic diagram of the structure of a transformer in one embodiment;

[0033] Figure 3 A schematic diagram of the structure of a transformer containing windings in one embodiment;

[0034] Figure 4 A schematic diagram of a conductive connecting member fixing a conductive member in an embodiment;

[0035] Figure 5 A schematic diagram of the structure of a bent portion of a conductive member in one embodiment;

[0036] Figure 6 A schematic diagram of the proportional relationship between the groove depth and the thickness of the first protruding member in one embodiment;

[0037] Figure 7 for Figure 6 A partial enlarged view of the middle A area;

[0038] Figure 8 A schematic diagram of the positional relationship between a fixing member and a magnetic core in one embodiment;

[0039] Fig. 9 is a schematic structural diagram of a transformer in another embodiment;

[0040] Fig.10 A schematic diagram of a structure in which a conductive member is fixed by a conductive connecting member in one embodiment;

[0041] Fig.11 A block diagram of a circuit board structure in one embodiment.

[0042] Explanation of the accompanying drawings: 10, magnetic core; 10-1, first magnetic core; 10-2, second magnetic core; 11, base; 12, first protrusion; 12-1, second protrusion; 13, first magnetic column; 14, second magnetic column; 20, conductive member; 21, bending portion; 30, conductive connecting member; 40, fixing member; 41, first bobbin; 42, second bobbin; 50, circuit board structure; 51, first circuit; 52, second circuit; 53-1, first switching device; 53-2, second switching device; S1, first surface; Q1, groove; Q2, first opening; Q3, second opening; W1, first accommodating space; W2, second accommodating space; P1, first winding; P2, second winding. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0048] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0049] See also Figure 1 , Figure 1 The schematic diagram of the structure of the transformer in the conventional technology is shown, which includes a magnetic core 10 and a winding. Exemplarily, the magnetic core 10 can be an iron core made of a magnetic material, such as a ferrite material, an iron powder core material, wherein the iron powder core material can be sendust aluminum, iron silicon, etc. The magnetic core 10 has a first accommodating space W1 and a second accommodating space W2 inside. When in use, the primary winding and the secondary winding are respectively wound in the first accommodating space W1 and the second accommodating space W2, such as arranging the primary winding in the first accommodating space W1 and arranging the secondary winding in the second accommodating space W2. When the input current passes through the primary winding, it will generate a magnetic field in the center. According to the principle of electromagnetic induction, this magnetic field will pass through the magnetic circuit of the transformer, and then generate an induced electromotive force in the secondary winding, and realize voltage conversion according to the different number of turns of the winding.

[0050] However, during the operation of the transformer, the magnetic core 10 will be affected by the alternating magnetic field, causing the magnetic flux inside the magnetic core 10 to change. This change in magnetic flux will cause eddy currents to be generated in the magnetic core 10, and then generate a magnetic field. This magnetic field will make the magnetic core a signal source, radiating energy to the surrounding space. If there are other electronic devices nearby, these devices may be affected by the magnetic field and suffer electromagnetic interference.

[0051] Based on this, an embodiment of the present application provides a transformer that can connect the magnetic core 10 to a circuit to form a loop, so that the current generated by electromagnetic induction flows in the circuit loop, eliminating the noise caused by eddy current.

[0052] See also Figure 2 , Figure 2 A schematic structural diagram of a transformer in one embodiment of the utility model is shown. The transformer provided by one embodiment of the utility model includes a magnetic core 10 and a conductive member 20 .

[0053] Figure 3 FIG. 1 shows a schematic diagram of a structure of a transformer containing windings in an embodiment. Figure 3 As shown, the magnetic core 10 can be used to accommodate the first winding P1 and the second winding P2, support the first winding P1 and the second winding P2, maintain the geometric shape and relative position of the windings, and improve the magnetic flux conduction efficiency between the first winding P1 and the second winding P2.

[0054] The conductive member 20 is electrically connected to the magnetic core 10. When the conductive member 20 is connected to an external circuit to form a loop, the current generated on the transformer magnetic core 10 is introduced into the circuit loop, reducing the loop impedance, thereby eliminating the electromagnetic radiation of the magnetic core 10 and reducing electromagnetic interference to other electronic devices.

[0055] Continue as Figure 2 As shown, the magnetic core 10 includes a base 11 , a first protrusion 12 is disposed on a first surface S1 of the base 11 , a groove Q1 is formed on the outer side of the first protrusion 12 , and the conductive member 20 is at least partially located in the groove Q1 and electrically connected to the first protrusion 12 .

[0056] In this embodiment, the conductive member 20 is electrically connected to the first protruding member 12, providing a method for connecting the magnetic core 10 to the circuit. When the magnetic core 10 generates eddy current based on electromagnetic induction, the current can be introduced into the circuit loop through the conductive member 20 to reduce noise.

[0057] The transformer provided in this embodiment has a groove Q1 formed on the first protruding member 12, and the conductive member 20 is disposed in the groove Q1 and electrically connected to the first protruding member 12. The conductive member 20 can extend a certain distance in the groove Q1, so that the groove Q1 protects the conductive member 20 and prevents the conductive member 20 from being separated from the first protruding member 12 due to accidental collision.

[0058] Specifically, the first end of the conductive member 20 is connected to the first protruding member 12, and the second end of the conductive member 20 is connected to the target lead-out position of the current. For example, the second end can be grounded or electrically connected to other stable potentials to lead out the current. Optionally, the conductive member 20 can be a needle-like structure or a strip-like structure. The needle-like structure refers to a structure with a pointed and slender shape, and the strip-like structure refers to a structure with a long strip shape. Optionally, the conductive member can be a conductive needle, a conductive pin, or a conductive wire. The needle-like structure and the strip-like structure facilitate extension and electrical connection with a stable potential.

[0059] See also Figure 2 and Figure 3 , the following describes an embodiment in which the first winding P1 is accommodated in the first accommodating space W1 and the second winding P2 is accommodated in the second accommodating space W2. In one embodiment, a first magnetic column 13 and a second magnetic column 14 are provided in the first protruding piece 12, the first magnetic column 13 is located in the first protruding piece 12, and the second magnetic column 14 is located in the first magnetic column 13. Optionally, the first magnetic column 13 may be annular. A first accommodating space W1 is formed between the first magnetic column 13 and the first protruding piece 12 for accommodating the first winding P1, and the first winding P1 is wound in the first accommodating space W1, and a second accommodating space W2 is formed between the second magnetic column 14 and the first magnetic column 13 for accommodating the second winding P2, and the second winding P2 is wound in the second accommodating space W2. Optionally, the first winding P1 may be a primary winding, and the second winding P2 may be a secondary winding. Optionally, with the base 11 as a reference, the height of the first magnetic column 13 is lower than the height of the first protrusion 12, and the height difference therebetween is a preset distance, thereby forming an air gap on the side of the first magnetic column 13 away from the base 11, and the leakage inductance can be controlled by the air gap.

[0060] Optionally, the material of the first magnetic column 13 may be different from the material of the first protruding piece 12 and the second magnetic column 14, so that the magnetic permeabilities of the first magnetic column 13 and the first protruding piece 12 and the second magnetic column 14 are different, thereby making the magnetic field density more uniform.

[0061] Optionally, the first protruding member 12, the first magnetic column 13, the second magnetic column 14 and the base 11 are made of the same material, and the same mold can be used during manufacturing to improve manufacturing efficiency.

[0062] like Figure 4 As shown, Figure 4 A schematic diagram of a conductive connecting member 30 fixing the conductive member 20 in an embodiment is shown. In an exemplary embodiment, the conductive member 20 is at least partially fixed in the groove Q1 by the conductive connecting member 30.

[0063] Optionally, the conductive connecting member 30 is located at the end of the groove Q1, and the contact area between the conductive member 20 and the first protruding member 12 is fixed at the end of the groove Q1 to facilitate contact with other devices.

[0064] The conductive connector 30 has both the functions of conducting and connecting. By fixing the conductive member 20 with the conductive connector 30, on the one hand, the connection strength between the conductive member 20 and the first protruding member 12 can be improved to prevent the conductive member 20 from accidentally falling off during operation of the transformer; on the other hand, the conductive connector 30 can increase the conductive area between the conductive member 20 and the first protruding member 12, thereby improving the ability to drain eddy currents.

[0065] Optionally, the conductive connector 30 may be a conductive adhesive obtained by adding a conductive material into a colloid matrix. Optionally, the colloid matrix may be silica gel, polymer glue or epoxy resin, etc., and the conductive material may be metal powder (such as silver powder, copper powder), carbon black or conductive polymer, etc.

[0066] like Figure 4 As shown, when the conductive adhesive fixes the conductive member 20 to the groove in a wrapped form, a wrapping structure can be formed in the contact area of ​​the first protruding member 12. Optionally, the wrapping structure can be spherical, square, cylindrical, etc., or other irregular shapes, as long as the conductive member 20 can be fixed, and this embodiment is not limited to this.

[0067] Optionally, the conductive connecting member 30 may also be a metal sheet, which fixes the conductive member 20 in the groove Q1 (eg, Fig.10 The metal sheet crosses the groove Q1 and is bonded to the first protruding members 12 on both sides of the groove Q1, and fixes the conductive member 20 at the position of the groove Q1.

[0068] In one implementation, the metal sheet can be bonded to the first protruding member 12 by conductive adhesive, and the conductive member is also fixed by the conductive adhesive. In another implementation, the metal sheet fixes the conductive member by pressing. Optionally, the metal sheet can be a metal or alloy such as copper, aluminum, silver, iron, etc. Exemplarily, the metal sheet can be copper foil, which has good electrical conductivity and can improve the electrical conductivity of the conductive member 20 and the first protruding member 12.

[0069] See also Figure 5 , Figure 5A schematic diagram of the structure of the bent portion 21 of the conductive member 20 in an embodiment is shown. In an exemplary embodiment, the conductive member 20 has a bent portion 21, and the conductive connector 30 fixes the bent portion 21 of the conductive member 20 in the groove Q1. The conductive connector 30 fixes the bent portion 21, thereby fixing the entire conductive member 20. The bent portion 21 can increase the contact area between the conductive member 20 and the first protruding member 12, increase the conductive area, and improve the current extraction effect on the first protruding member 12.

[0070] The curved portion 21 can also prevent the conductive member 20 from falling off. For example, for a needle-shaped structure, when the viscosity of the conductive adhesive decreases, a gap is easily formed between the needle-shaped structure and the conductive adhesive, and then the needle-shaped structure is separated from the conductive adhesive and falls off, forming a needle-shaped hole on the conductive adhesive. When the curved portion 21 is provided, the contact area between the conductive adhesive and the conductive member 20 is increased to prevent it from falling off. Even if a gap is formed, the conductive adhesive around the handle of the conductive member 20 will support the curved portion 21 to prevent it from falling off.

[0071] In an exemplary embodiment, the groove Q1 is cylindrical or square, which is convenient for fixing the conductive member 20. The cylindrical shape includes a perfect circle or an ellipse in cross-sectional area, and the square shape includes a square, a rectangle or other polygon in cross-sectional area. This arrangement is convenient for accommodating the conductive member 20.

[0072] like Figure 6 and Figure 7 As shown, Figure 6 A schematic diagram showing the proportional relationship between the depth of the groove Q1 and the thickness of the first protruding member 12 is shown. Figure 7 Shows Figure 6 A partial enlarged view of the A area in the middle. In an exemplary embodiment, in the thickness direction of the first protruding member 12, the ratio of the depth L of the groove Q1 to the thickness D of the first protruding member 12 is less than a preset ratio threshold. Optionally, the thickness direction of the first protruding member 12 is parallel to the direction of the base 11. The ratio φ=L / D, optionally, the preset ratio threshold can be 0.1-0.5, at which time the depth L of the groove Q1 is less than half of the thickness D of the first protruding member 12. Optionally, the preset ratio threshold can also be 0.3.

[0073] Setting a preset ratio threshold can limit the maximum depth of the groove Q1. When the depth of the groove Q1 is too large, the first protruding member 12 will be too thin at the position of the groove Q1, the strength will be reduced, and it will be easy to break and damage. When the ratio of the depth L of the groove Q1 to the thickness D of the first protruding member 12 is less than the preset ratio threshold, the conductive member 20 can be effectively accommodated under the condition of ensuring the mechanical strength of the first protruding member 12.

[0074] Continue to see Figure 3In an exemplary embodiment, the length of the groove Q1 along the protruding direction of the first protruding member 12 is shorter than that of the first protruding member 12. Optionally, the protruding direction of the first protruding member 12 refers to the protruding direction X of the first protruding member 12 relative to the base 11, such as a direction perpendicular to the first surface S1. The length of the groove Q1 is shorter than that of the first protruding member 12, so that the groove Q1 does not penetrate the first protruding member 12, and when the conductive member 20 is located in the groove Q1, its top can further contact with the first protruding member 12, thereby increasing the conductive area.

[0075] In an exemplary embodiment, see Figure 7 The first protruding member 12 is provided with a first opening Q2, and the groove Q1 is provided at a preset distance N from the first opening Q2. Optionally, the preset distance N may be 1 mm to 3 mm.

[0076] When the first winding P1 and the second winding P2 are contained in the magnetic core 10, the lead-out portions of the first winding P1 and the second winding P2 need to be led out of the magnetic core 10 to be connected to an external circuit, and at this time, the lead-out portions of the first winding P1 and the second winding P2 can be led out from the first opening Q2. Optionally, the base 11 and the first protruding piece 12 are both opened and connected to form the first opening Q2.

[0077] The thickness of the first protruding member 12 at the position of the groove Q1 is smaller than that at other positions. In order to ensure that the area between the groove Q1 and the first opening Q2 does not bend with the groove Q1 as a fold line, the groove Q1 needs to maintain a certain distance from the first opening Q2, so that the strength of the first protruding member 12 can be ensured. At the same time, in order to facilitate the connection of the conductive member 20 with the external circuit, the distance between the groove Q1 and the first opening Q2 should not be too large, so that it is convenient to set the fixing member 40 at the first opening Q2 (see Figure 8 ) to fix the conductive member 20.

[0078] See also Figure 8 , Figure 8A schematic diagram of the positional relationship between a fixing member 40 and a magnetic core 10 in an embodiment is shown. In an exemplary embodiment, the transformer further includes a fixing member 40, which is configured in the first opening Q2, such as by snapping, or the size of the fixing member 40 is set to be consistent with the first opening Q2 so as to be engaged and connected. The first part of the fixing member 40 is located inside the first protruding member 12, and the second part of the fixing member 40 is located outside the first protruding member 12. Optionally, the first part of the fixing member 40 located inside the first protruding member 12 can be used to fix the first winding P1 and the second winding P2, maintain the geometric shape and relative position of the first winding P1 and the second winding P2, and prevent the first winding P1 and the second winding P2 from being displaced or deformed due to the magnetic field generated by the current. In a feasible implementation, the fixing member 40 includes a first bobbin 41 and a second bobbin 42, the first bobbin 41 is used to fix the first winding P1, and the second bobbin 42 is used to fix the second winding P2.

[0079] In a feasible implementation, the second portion of the fixing member 40 is provided with a second opening Q3, and one end of the conductive member 20 is passed through the second opening Q3. Optionally, the second opening Q3 may be a through hole that passes through the fixing member 40. At this time, the first end of the conductive member 20 is electrically connected to the first protruding member 12, and the second end is fixed to the second opening Q3. Optionally, the second opening Q3 may pass through the fixing member 40, so that one end of the conductive member 20 is fixed by the second opening Q3 and then extends out of the fixing member 40, so that it is convenient for it to be electrically connected to the stable potential.

[0080] See also Fig. 9 , Fig. 9 A schematic diagram of the structure of a transformer in another embodiment is shown. The present application also provides a transformer, comprising a first magnetic core 10-1, a second magnetic core 10-2 and a conductive member 20. A through groove Q1 is provided on the outside of the first protruding member 12 of the first magnetic core 10-1, and the conductive member 20 is at least partially located in the groove Q1 and abuts against the second protruding member 12-1 of the second magnetic core 10-2. Optionally, the curved portion of the conductive member 20 is located in the groove Q1 and abuts against the second protruding member 12-1. The through groove Q1 facilitates processing, improves processing efficiency and reduces processing costs.

[0081] Optionally, the first magnetic core 10-1 and the second magnetic core 10-2 are arranged relative to each other and are connected in a close connection, and the first protruding piece 12 of the first magnetic core 10-1 and the second protruding piece 12-1 of the second magnetic core 10-2 are arranged relative to each other to form a space for accommodating the first winding P1 and the second winding P2 inside. In one embodiment, the first magnetic core 10-1 and the second magnetic core 10-2 are identical and symmetrically bonded together. With this arrangement, only one mold can be used during the processing, which improves the preparation efficiency and reduces the mold opening cost.

[0082] See also Fig.10 , Fig.10 A schematic diagram of a structure in which the conductive member 20 is fixed by the conductive connector 30 in one embodiment is shown. In an exemplary embodiment, the conductive member 20 is at least partially fixed in the groove Q1 by the conductive connector 30, and the conductive connector 30 is connected across the first magnetic core 10-1 and the second magnetic core 10-2.

[0083] Optionally, the conductive connecting member 30 may also be a metal sheet, such as Fig.10 As shown in the shaded area in FIG. 1 , the metal sheet fixes the conductive member 20 in the groove Q1. The metal sheet simultaneously connects the first magnetic core 10-1 and the second magnetic core 10-2, so that the first magnetic core 10-1 and the second magnetic core 10-2 are electrically connected, and fixes the conductive member 20 at the position of the groove Q1.

[0084] Optionally, the conductive connecting member 30 may also be a conductive adhesive, which simultaneously bonds the conductive member, the first magnetic core 10 - 1 and the second magnetic core 10 - 2 , so that the first magnetic core 10 - 1 and the second magnetic core 10 - 2 are electrically connected.

[0085] The conductive connecting member 30 can electrically connect the first magnetic core 10 - 1 and the second magnetic core 10 - 2 , so that when current is generated in the first magnetic core 10 - 1 and / or the second magnetic core 10 - 2 based on electromagnetic induction, the current can be drawn out from the conductive member 20 .

[0086] See also Fig.11 , Fig.11 A block diagram of a circuit board structure 50 in an embodiment is shown. The present application also provides a circuit board structure 50, which includes a circuit board and a transformer. The circuit board is provided with a first circuit 51 and a second circuit 52, and the first circuit 51 and / or the second circuit 52 include a switching device. The transformer is arranged on the circuit board and connected to the circuit board through the second surface. The first protruding member 12 has a first accommodating space W1 and a second accommodating space W2, the first accommodating space W1 has a first winding P1, the second accommodating space W2 has a second winding P2, the first winding P1 is electrically connected to the first circuit 51, the second winding P2 is electrically connected to the second circuit 52, and the conductive member 20 is electrically connected to the stable potential of the circuit board.

[0087] Optionally, the switching device can be a switching tube controlled by PWM (Pulse width modulation wave), such as MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). Multiple switching devices form a rectifier module, a filter module or an inverter module. When PWM controls the MOS tube, due to the rapid switching of the PWM signal, a rapid change in current will occur, thereby generating a magnetic field. When there is a switching device in the circuit structure, eddy currents will be generated on the magnetic core 10 of the transformer based on the principle of electromagnetic induction, thereby generating noise. Therefore, the magnetic core needs to be grounded to reduce impedance.

[0088] In this embodiment, by electrically connecting the conductive member 20 to the stable potential on the circuit board, similar to connecting the magnetic core 10 to the stable potential with a wire, a low impedance loop is formed, so that the magnetic core 10 is no longer a suspended conductor, and the voltage and current signals generated after coupling the electromagnetic wave can be led away through the low impedance loop, thereby reducing noise.

[0089] In a feasible implementation, the stable potential is the ground potential on the circuit board. Optionally, the ground potential can be a potential connected to a ground wire, or a virtual ground potential formed by the circuit board. Virtual ground potential refers to a ground point simulated in a circuit, which is not actually directly connected to the ground, but is regarded as a ground potential in circuit design and analysis.

[0090] In another possible implementation, Fig.11 As shown in (a), the first circuit includes a DC power supply, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first switching device 53-1 and a first inductor, and the second circuit includes a second inductor, a second switching device 53-2, a fourth capacitor C4, a fifth capacitor C5 and a sixth capacitor C6.

[0091] The stable potential can be any one of the following (1)-(5): (1) The positive electrode of the power supply in the first circuit 51 ( Fig.11 DC+ in the first circuit 51); (2) the negative electrode of the power supply in the first circuit 51 ( Fig.11 DC- in the second circuit 52); (3) the neutral line in the second circuit 52 ( Fig.11 N in the second circuit 52); (4) the live wire in the second circuit 52 ( Fig.11 (5) an intermediate potential formed by interconnecting filter capacitors in the first circuit 51 or the second circuit 52.

[0092] Alternatively, if Fig.11As shown in (b), noise loops B1 and B2 can be formed, wherein the intermediate potential is located between the second capacitor C2 and the third capacitor C3, the noise loop B1 is formed in the first circuit, formed between the second capacitor C2 and the transformer, and the noise loop B2 is formed in the second circuit, formed between the fourth capacitor C4 and the transformer. Fig.11 As shown in (c) in FIG. 1 , noise loops B3 and B4 can also be formed. The noise loop B3 is formed in the first circuit, between the third capacitor C3 and the transformer and , and the noise loop B4 is formed in the second circuit, between the sixth capacitor C6 and the transformer and .

[0093] In addition, according to the definition of common mode noise: common mode noise = (V1 + V2) / 2, the common mode noise is balanced. Connect the conductive parts to Fig.11 The middle potential shown, taking the middle potential as the balance point, can well balance the common mode noise.

[0094] The circuit board structure 50 provided in this embodiment includes a switching device. The rapid change of the switching device will generate a rapid change of the current, thereby generating a magnetic field. When the switching device is included in the circuit structure, eddy currents will be generated on the magnetic core 10 of the transformer based on the principle of electromagnetic induction. The magnetic core 10 is connected to the stable potential through the conductive member 20, which can be used as a conductor to form a loop between the magnetic core 10 and the stable potential. The current generated on the transformer magnetic core 10 based on electromagnetic induction is introduced into the circuit loop instead of existing in the form of eddy currents, thereby eliminating the electromagnetic radiation of the magnetic core 10, reducing electromagnetic interference to other electronic devices, and eliminating noise.

[0095] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0096] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A transformer, characterized in that: The transformer comprises: a magnetic core and a conductive member; The magnetic core comprises a base, a first surface of the base is provided with a first protruding piece, and an outer side of the first protruding piece is provided with a groove; The conductive element is at least partially located in the groove and is electrically connected to the first protruding element.

2. The transformer according to claim 1, characterized in that: The conductive member is at least partially fixed in the groove via a conductive connecting member.

3. The transformer according to claim 2, characterized in that: The conductive member has a bent portion, and the conductive connecting member is located corresponding to the bent portion of the conductive member.

4. The transformer according to claim 2, characterized in that: The conductive connection member is located at an end of the groove.

5. The transformer according to claim 2, characterized in that: The conductive connecting member is a metal sheet, and the conductive member is fixed in the groove through the metal sheet.

6. The transformer according to any one of claims 1 to 4, characterized in that: The groove is cylindrical or square.

7. The transformer according to any one of claims 1 to 4, characterized in that: In the thickness direction of the first protruding piece, a ratio of the depth of the groove to the thickness of the first protruding piece is less than a preset ratio threshold.

8. The transformer according to any one of claims 1 to 4, characterized in that: The length of the groove along the protruding direction of the first protruding piece is smaller than that of the first protruding piece.

9. The transformer according to any one of claims 1 to 4, characterized in that: The first protruding piece is provided with a first opening, and the groove is provided at a preset distance from the first opening.

10. The transformer according to claim 9, characterized in that: The transformer also includes: A fixing member is disposed at the first opening, wherein a first portion of the fixing member is located inside the first protruding member, and a second portion of the fixing member is located outside the first protruding member.

11. The transformer according to claim 10, characterized in that: The second portion of the fixing member is provided with a second opening, and one end of the conductive member is passed through the second opening.

12. A transformer, characterized in that: comprising a first magnetic core, a second magnetic core and a conductive member, A through groove is formed on the outer side of the first protruding piece of the first magnetic core. The conductive piece is at least partially located in the groove and abuts against the second protruding piece of the second magnetic core.

13. The transformer according to claim 12, characterized in that The conductive member is at least partially fixed in the groove by a conductive connecting member, and the conductive connecting member is connected across the first magnetic core and the second magnetic core.

14. A circuit board structure, characterized in that: The circuit board structure comprises: A circuit board, provided with a first circuit and a second circuit, wherein the first circuit and / or the second circuit comprises a switch device; The transformer described in any one of claims 1 to 11 is configured on the circuit board, and the first protrusion has a first accommodating space and a second accommodating space, the first accommodating space has a first winding, the second accommodating space has a second winding, the first winding is electrically connected to the first circuit, the second winding is electrically connected to the second circuit, and the conductive member is electrically connected to the stable potential of the circuit board.

15. The circuit board structure according to claim 14, characterized in that: The stable potential is a ground potential on the circuit board.

16. The circuit board structure according to claim 14, characterized in that: The stable potential is any one of the following: The positive or negative pole of the power supply in the first circuit; The neutral or hot wire in the second circuit; The intermediate potential formed by connecting the filter capacitors in the first circuit or the second circuit.

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