Transformer and circuit board structure

Abstract

The present disclosure relates to a transformer and a circuit board structure. The transformer comprises: a magnetic core and a conductive member, wherein the magnetic core comprises a base, a first surface of the base is provided with a first protruding member, and the outer side of the first protruding member is provided with a groove; and the conductive member is at least partially located in the groove and is electrically connected to the first protruding member. When eddy currents are generated on a magnetic core of a transformer due to a change in magnetic flux, the eddy currents can be led out from a conductive member, so as to eliminate an extra current on the magnetic core, thereby avoiding vibration of the magnetic core, and thus eliminating noise.

Description

Transformer and circuit board structure

[0001] Related applications

[0002] This disclosure claims priority to Chinese patent application No. 2024208852530, filed on April 26, 2024, entitled "Transformer and Circuit Board Structure", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of power electronics technology, and in particular to transformer and circuit board structures. Background Technology

[0004] A transformer is an electrical device used to change alternating current (AC) voltage. It achieves voltage transformation between input and output through the principle of electromagnetic induction. A transformer typically consists of two or more windings mounted on a magnetic core. Depending on the transformer's turns ratio (the ratio of the number of turns in the primary winding to the number of turns in the secondary winding), the input voltage can be increased or decreased to the desired output voltage level.

[0005] When a transformer is in operation, it generates high-frequency electromagnetic noise on the magnetic core, making the transformer a noise signal source that radiates electromagnetic waves outward, causing adverse effects. Summary of the Invention

[0006] Therefore, it is necessary to provide a transformer and circuit board structure to address the issue of transformer radiating noise.

[0007] In a first aspect, this disclosure provides a transformer, the transformer comprising: a magnetic core and conductive components;

[0008] The magnetic core includes a base, and a first protrusion is provided on the first surface of the base, and a groove is provided on the outer side of the first protrusion;

[0009] The conductive element is at least partially located within the groove and is electrically connected to the first protrusion.

[0010] In one embodiment, the conductive element is at least partially fixed within the groove by a conductive connector.

[0011] In one embodiment, the conductive element has a bent portion, and the position of the conductive connector corresponds to the bent portion of the conductive element.

[0012] In one embodiment, the conductive connector is located at the end of the groove.

[0013] In one embodiment, the conductive connector is a metal sheet, and the conductive element is fixed in the groove by the metal sheet.

[0014] In one embodiment, the groove is cylindrical or square.

[0015] In one embodiment, the ratio of the depth of the groove to the thickness of the first protrusion is less than a preset ratio threshold in the thickness direction of the first protrusion.

[0016] In one embodiment, the length of the groove along the protrusion direction of the first protrusion is less than that of the first protrusion.

[0017] In one embodiment, the first protrusion has a first opening, and the groove is located at a predetermined distance from the first opening.

[0018] In one embodiment, the transformer further includes:

[0019] A fastener is disposed at the first opening, with a first portion of the fastener located inside the first protrusion and a second portion of the fastener located outside the first protrusion.

[0020] In one embodiment, the second part of the fastener has a second opening, and one end of the conductive element passes through the second opening.

[0021] Secondly, this disclosure also provides a transformer, including a first magnetic core, a second magnetic core and a conductive element, wherein a through groove is formed on the outer side of a first protrusion of the first magnetic core, and the conductive element is at least partially located in the groove and abuts against a second protrusion of the second magnetic core.

[0022] In one embodiment, the conductive element is at least partially fixed within the groove by a conductive connector that spans the first magnetic core and the second magnetic core.

[0023] Thirdly, this disclosure also provides a circuit board structure, the circuit board structure comprising:

[0024] A circuit board is provided with a first circuit and a second circuit, wherein the first circuit and / or the second circuit includes a switching device;

[0025] The transformer is disposed on the circuit board. The first protrusion has a first receiving space and a second receiving space. The first receiving space has a first winding, and the second receiving 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 element is electrically connected to the stable potential of the circuit board.

[0026] In one embodiment, the stable potential is the ground potential on the circuit board.

[0027] In one embodiment, the stable potential is any of the following:

[0028] The positive or negative terminal of the power supply in the first circuit;

[0029] The neutral or live wire in the second circuit;

[0030] The intermediate potential formed by the interconnection of filter capacitors in the first or second circuit.

[0031] In the above-mentioned transformer and circuit board structure, the transformer includes a magnetic core and a conductive component; a groove is formed on the magnetic core, and the conductive component is at least partially located in the groove and electrically connected to the magnetic core. When the conductive component 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 devices, and eliminating noise. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments or conventional technologies of this disclosure, the accompanying drawings used in the description of the embodiments or conventional technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the disclosed drawings without creative effort.

[0033] Figure 1 is a schematic diagram of the structure of a transformer in conventional technology;

[0034] Figure 2 is a schematic diagram of the transformer in one embodiment;

[0035] Figure 3 is a schematic diagram of the structure of a transformer that houses windings in one embodiment;

[0036] Figure 4 is a schematic diagram of the conductive connector fixing the conductive component in one embodiment;

[0037] Figure 5 is a schematic diagram of the structure of the bent portion of the conductive element in one embodiment;

[0038] Figure 6 is a schematic diagram showing the proportional relationship between the groove depth and the thickness of the first protrusion in one embodiment;

[0039] Figure 7 is a magnified view of region A in Figure 6;

[0040] Figure 8 is a schematic diagram of the positional relationship between the fixing member and the magnetic core in one embodiment;

[0041] Figure 9 is a schematic diagram of the transformer in another embodiment;

[0042] Figure 10 is a schematic diagram of a structure in which a conductive component is fixed by a conductive connector in one embodiment;

[0043] Figure 11 is a block diagram of a circuit board structure in one embodiment.

[0044] Explanation of reference numerals in the attached 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 post; 14, second magnetic post; 20, conductive component; 21, bent portion; 30, conductive connector; 40, fixing component; 41, first spool; 42, second spool; 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 Implementation

[0045] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this disclosure.

[0046] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0049] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0051] Referring to Figure 1, which shows a schematic diagram of a conventional transformer structure, it includes a magnetic core 10 and windings. Exemplarily, the magnetic core 10 can be an iron core made of a magnetic material, such as ferrite or iron powder core material, where the iron powder core material can be iron-silicon-aluminum, iron-silicon, etc. The magnetic core 10 has a first accommodating space W1 and a second accommodating space W2. In use, the primary winding and the secondary winding are wound into the first accommodating space W1 and the second accommodating space W2 respectively, for example, the primary winding is placed in the first accommodating space W1 and the secondary winding is placed in the second accommodating space W2. When an input current passes through the primary winding, it generates a magnetic field at the center. According to the principle of electromagnetic induction, this magnetic field passes through the transformer's magnetic circuit, thereby generating an induced electromotive force in the secondary winding, achieving voltage transformation according to the number of turns in the winding.

[0052] However, during the operation of the transformer, the magnetic core 10 will be affected by the alternating magnetic field, which will cause 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, which in turn will generate a magnetic field. This magnetic field will make the magnetic core a signal source and radiate energy into the surrounding space. If there are other electronic devices nearby, these devices may be affected by the magnetic field and suffer electromagnetic interference.

[0053] Based on this, the present disclosure provides a transformer that can connect the magnetic core 10 to the circuit to form a loop, so that the current generated by electromagnetic induction flows in the circuit loop and eliminates noise caused by eddy currents.

[0054] Referring to Figure 2, which shows a schematic diagram of the structure of a transformer in one embodiment of the present disclosure, the transformer provided in one embodiment of the present disclosure includes a magnetic core 10 and a conductive element 20.

[0055] Figure 3 shows a schematic diagram of the structure of a transformer with windings in one embodiment. As shown in Figure 3, 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 geometry and relative position of the windings, and improve the magnetic flux conduction efficiency between the first winding P1 and the second winding P2.

[0056] The conductive element 20 is electrically connected to the magnetic core 10. When the conductive element 20 is connected to the 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 and thus eliminating the electromagnetic radiation of the magnetic core 10, reducing electromagnetic interference to other electronic equipment.

[0057] As shown in Figure 2, the magnetic core 10 includes a base 11. The first surface S1 of the base 11 is provided with a first protrusion 12. A groove Q1 is formed on the outer side of the first protrusion 12. The conductive element 20 is located at least partially in the groove Q1 and is electrically connected to the first protrusion 12.

[0058] In this embodiment, the conductive element 20 is electrically connected to the first protrusion 12, providing a way to connect the magnetic core 10 to the circuit. When the magnetic core 10 generates eddy currents based on electromagnetic induction, the current can be introduced into the circuit loop through the conductive element 20, thereby reducing noise.

[0059] The transformer provided in this embodiment has a groove Q1 formed on the first protrusion 12, and a conductive element 20 is disposed in the groove Q1 and electrically connected to the first protrusion 12. The conductive element 20 can extend a certain distance in the groove Q1, so that the groove Q1 protects the conductive element 20 and prevents accidental collisions from separating the conductive element 20 from the first protrusion 12.

[0060] Specifically, the first end of the conductive element 20 is connected to the first protrusion 12, and the second end of the conductive element 20 is connected to the target current extraction location. For example, the second end can be grounded or electrically connected to other stable potentials to extract the current. Optionally, the conductive element 20 can be a needle-like structure or a strip-like structure. A needle-like structure refers to a structure with a pointed, elongated shape, while a strip-like structure refers to a structure with a long, thin shape. Optionally, the conductive element can be a conductive needle, a conductive pin, or a conductive wire, etc. Needle-like and strip-like structures facilitate extension and electrical connection to a stable potential.

[0061] Referring to Figures 2 and 3, an embodiment is described below where 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 post 13 and a second magnetic post 14 are provided within the first protrusion 12, with the first magnetic post 13 located within the first protrusion 12 and the second magnetic post 14 located within the first magnetic post 13. Optionally, the first magnetic post 13 may be annular. The first accommodating space W1 is formed between the first magnetic post 13 and the first protrusion 12 to accommodate the first winding P1, and the first winding P1 is wound around the first accommodating space W1. The second accommodating space W2 is formed between the second magnetic post 14 and the first magnetic post 13 to accommodate the second winding P2, and the second winding P2 is wound around 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 post 13 is lower than the height of the first protrusion 12, and the height difference between the two is a preset distance, thereby forming an air gap on the side of the first magnetic post 13 away from the base 11, which can control the leakage inductance.

[0062] Optionally, the material of the first magnetic post 13 may be different from that of the first protrusion 12 and the second magnetic post 14, so that the magnetic permeability of the first magnetic post 13 and the first protrusion 12 and the second magnetic post 14 is different, thereby making the magnetic field density more uniform.

[0063] Optionally, the first protrusion 12, the first magnetic post 13, the second magnetic post 14 and the base 11 are made of the same material, and the same mold can be used during manufacturing to improve manufacturing efficiency.

[0064] As shown in Figure 4, Figure 4 illustrates a schematic diagram of the conductive connector 30 fixing the conductive member 20 in one embodiment. In an exemplary embodiment, the conductive member 20 is at least partially fixed within the groove Q1 by the conductive connector 30.

[0065] Optionally, the conductive connector 30 is located at the end of the groove Q1, fixing the contact area between the conductive component 20 and the first protrusion 12 to the end of the groove Q1, facilitating contact with other devices.

[0066] The conductive connector 30 serves both to conduct electricity and to connect. By fixing the conductive component 20 with the conductive connector 30, the connection strength between the conductive component 20 and the first protrusion 12 can be improved, preventing the conductive component 20 from accidentally falling off during transformer operation. On the other hand, the conductive connector 30 can increase the conductive area between the conductive component 20 and the first protrusion 12, thereby improving the ability to guide eddy currents.

[0067] Optionally, the conductive connector 30 can be a conductive adhesive, which is obtained by adding a conductive material to a colloidal matrix. Optionally, the colloidal matrix can be silicone, polymer adhesive, or epoxy resin, etc., and the conductive material can be metal powder (such as silver powder, copper powder), carbon black, or conductive polymer, etc.

[0068] As shown in Figure 4, when the conductive adhesive fixes the conductive component 20 to the groove in a wrapping manner, a wrapping structure can be formed in the contact area of ​​the first protrusion 12. Optionally, the wrapping structure can be spherical, square, or cylindrical, or other irregular shapes, as long as it can fix the conductive component 20. This embodiment does not limit this.

[0069] Optionally, the conductive connector 30 can also be a metal sheet, which fixes the conductive element 20 in the groove Q1 (as shown in the shaded area in Figure 10). The metal sheet crosses the groove Q1 and is bonded to the first protrusions 12 on both sides of the groove Q1, thus fixing the conductive element 20 at the position of the groove Q1.

[0070] In one implementation, the metal sheet can be bonded to the first protrusion 12 using conductive adhesive, and the conductive element can also be fixed using conductive adhesive. In another implementation, the metal sheet is fixed to the conductive element by pressing. Optionally, the metal sheet can be a metal or alloy such as copper, aluminum, silver, or iron. For example, the metal sheet can be copper foil, as copper has good conductivity and can improve the conductivity between the conductive element 20 and the first protrusion 12.

[0071] Referring to Figure 5, Figure 5 shows a schematic diagram of the structure of the bent portion 21 of the conductive member 20 in one embodiment. 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 protrusion 12, increase the conductive area, and improve the current extraction effect on the first protrusion 12.

[0072] The bend 21 also prevents the conductive element 20 from falling off. For example, with a needle-like structure, when the adhesiveness of the conductive adhesive decreases, gaps easily form between the needle-like structure and the conductive adhesive, causing it to separate and fall off, forming pinholes in the conductive adhesive. However, with the bend 21, the contact area between the conductive adhesive and the conductive element 20 is increased, preventing it from falling off. Furthermore, even if gaps occur, the conductive adhesive around the handle of the conductive element 20 will support the bend 21, preventing it from falling off.

[0073] In one exemplary embodiment, the groove Q1 is cylindrical or square, facilitating the fixing of the conductive element 20. The cylindrical shape includes those with a circular or elliptical cross-sectional area, while the square shape includes those with a square, rectangle, or other polygonal cross-sectional area. This arrangement facilitates the accommodating of the conductive element 20.

[0074] As shown in Figures 6 and 7, Figure 6 illustrates the proportional relationship between the depth of the groove Q1 and the thickness of the first protrusion 12, and Figure 7 shows a partially enlarged view of region A in Figure 6. In an exemplary embodiment, in the thickness direction of the first protrusion 12, the ratio of the depth L of the groove Q1 to the thickness D of the first protrusion 12 is less than a preset proportional threshold. Optionally, the thickness direction of the first protrusion 12 is parallel to the base 11. The ratio φ = L / D. Optionally, the preset proportional threshold can be 0.1-0.5, in which case the depth L of the groove Q1 is less than half the thickness D of the first protrusion 12. Optionally, the preset proportional threshold can also be 0.3.

[0075] Setting a preset ratio threshold can limit the maximum depth of the groove Q1. If the groove Q1 is too deep, the first protrusion 12 will be too thin at the groove Q1 position, resulting in reduced strength and easy breakage. When the ratio of the depth L of the groove Q1 to the thickness D of the first protrusion 12 is less than the preset ratio threshold, the conductive component 20 can be effectively accommodated while ensuring the mechanical strength of the first protrusion 12.

[0076] Referring again to Figure 3, in an exemplary embodiment, the length of the groove Q1 along the protrusion direction of the first protrusion 12 is less than that of the first protrusion 12. Optionally, the protrusion direction of the first protrusion 12 refers to the protrusion direction X of the first protrusion 12 relative to the base 11, such as a direction perpendicular to the first surface S1. The shorter length of the groove Q1 ensures that the groove Q1 does not penetrate the first protrusion 12, allowing the top of the conductive element 20 to further contact the first protrusion 12 when it is located within the groove Q1, thereby increasing the conductive area.

[0077] In an exemplary embodiment, referring to FIG7, the first protrusion 12 has a first opening Q2, and the groove Q1 is formed at a preset distance N from the first opening Q2. Optionally, the preset distance N can be 1mm-3mm.

[0078] When the magnetic core 10 contains the first winding P1 and the second winding P2, the leads of the first winding P1 and the second winding P2 need to be led out from the magnetic core 10 to connect with the external circuit. At this time, the leads 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 protrusion 12 are both open and connected to form the first opening Q2.

[0079] The thickness of the first protrusion 12 at the groove Q1 position should be less than the thickness at other positions. To ensure that the area between the groove Q1 and the first opening Q2 does not bend along the groove Q1, the groove Q1 needs to maintain a certain distance from the first opening Q2, thus ensuring the strength of the first protrusion 12. At the same time, to facilitate the connection of the conductive component 20 to an external circuit, the distance between the groove Q1 and the first opening Q2 should not be too large, so that a fixing component 40 (see Figure 8) can be installed at the first opening Q2 to fix the conductive component 20.

[0080] Referring to Figure 8, Figure 8 shows a schematic diagram of the positional relationship between the fixing member 40 and the magnetic core 10 in one embodiment. In an exemplary embodiment, the transformer further includes a fixing member 40, which is disposed in the first opening Q2, such as by a snap-fit, or by setting the size of the fixing member 40 to match the first opening Q2 for a fitting connection. A first portion of the fixing member 40 is located inside the first protrusion 12, and a second portion of the fixing member 40 is located outside the first protrusion 12. Optionally, the first portion of the fixing member 40 located inside the first protrusion 12 can be used to fix the first winding P1 and the second winding P2, maintaining the geometry and relative position of the first winding P1 and the second winding P2, while preventing the first winding P1 and the second winding P2 from being displaced or deformed by the magnetic field generated by the current. In a feasible implementation, the fixing member 40 includes a first spool 41 and a second spool 42, where the first spool 41 is used to fix the first winding P1, and the second spool 42 is used to fix the second winding P2.

[0081] In one feasible implementation, the second part of the fixing member 40 has a second opening Q3, and one end of the conductive member 20 passes through the second opening Q3. Optionally, the second opening Q3 can be a through hole penetrating the fixing member 40. In this case, the first end of the conductive member 20 is electrically connected to the first protrusion 12, and the second end is fixed to the second opening Q3. Optionally, the second opening Q3 can penetrate the fixing member 40. With this configuration, one end of the conductive member 20 protrudes from the fixing member 40 after being fixed by the second opening Q3, facilitating its electrical connection to a stable potential.

[0082] Referring to Figure 9, which shows a schematic diagram of a transformer in another embodiment, this disclosure also provides a transformer including a first magnetic core 10-1, a second magnetic core 10-2, and a conductive element 20. The first magnetic core 10-1 has a through groove Q1 on its outer side of a first protrusion 12. The conductive element 20 is at least partially located within the groove Q1 and abuts against the second protrusion 12-1 of the second magnetic core 10-2. Optionally, the bent portion of the conductive element 20 is located within the groove Q1 and abuts against the second protrusion 12-1. The through groove Q1 facilitates processing, improves processing efficiency, and reduces processing costs.

[0083] Optionally, the first magnetic core 10-1 and the second magnetic core 10-2 are arranged opposite to each other and bonded together. The first protrusion 12 of the first magnetic core 10-1 and the second protrusion 12-1 of the second magnetic core 10-2 are arranged opposite to each other to form a receiving space for 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. This arrangement allows only one mold to be used during processing, improving manufacturing efficiency and reducing mold opening costs.

[0084] Referring to Figure 10, Figure 10 shows a schematic diagram of a structure in which a conductive element 20 is fixed by a conductive connector 30 in one embodiment. In an exemplary embodiment, the conductive element 20 is at least partially fixed in the groove Q1 by the conductive connector 30, which spans the first magnetic core 10-1 and the second magnetic core 10-2.

[0085] Optionally, the conductive connector 30 can also be a metal sheet, as shown in the shaded area of ​​Figure 10. The metal sheet fixes the conductive element 20 in the groove Q1. The metal sheet simultaneously connects the first magnetic core 10-1 and the second magnetic core 10-2, enabling the first magnetic core 10-1 and the second magnetic core 10-2 to be electrically connected, and fixing the conductive element 20 at the position of the groove Q1.

[0086] Optionally, the conductive connector 30 can also be a conductive adhesive, which simultaneously bonds the conductive component, the first magnetic core 10-1, and the second magnetic core 10-2, thereby achieving an electrical connection between the first magnetic core 10-1 and the second magnetic core 10-2.

[0087] The conductive connector 30 enables the first magnetic core 10-1 and the second magnetic core 10-2 to be electrically connected, so that when a current is generated on 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 connector 20.

[0088] Referring to Figure 11, Figure 11 shows a block diagram of a circuit board structure 50 in one embodiment. This disclosure also provides a circuit board structure 50, which includes a circuit board and a transformer. The circuit board has a first circuit 51 and a second circuit 52, and the first circuit 51 and / or the second circuit 52 include switching devices. The transformer is disposed on the circuit board and connected to the circuit board via a second surface. A first protrusion 12 has a first receiving space W1 and a second receiving space W2. The first receiving space W1 has a first winding P1, and the second receiving space W2 has a second winding P2. The first winding P1 is electrically connected to the first circuit 51, and the second winding P2 is electrically connected to the second circuit 52. A conductive element 20 is electrically connected to the stable potential of the circuit board.

[0089] Optionally, the switching device can be a PWM (Pulse Width Modulation) controlled switching transistor, such as a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). Multiple switching devices form a rectifier module, filter module, or inverter module. When a PWM-controlled MOSFET is used, the rapid switching of the PWM signal generates a rapid change in current, which in turn generates a magnetic field. When the circuit structure contains switching devices, eddy currents will be generated in the transformer core 10 based on the principle of electromagnetic induction, thus generating noise. Therefore, the core needs to be grounded to reduce impedance.

[0090] In this embodiment, by electrically connecting the conductive element 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. The voltage and current signals generated after coupling electromagnetic waves can be diverted through the low-impedance loop, thereby reducing noise.

[0091] In one feasible implementation, the stable potential is the ground potential on the circuit board. Optionally, the ground potential can be the potential connected to the ground wire, or it can be a virtual ground potential formed by the circuit board. A virtual ground potential refers to a grounding point simulated in the circuit, which is not actually directly connected to the ground, but is regarded as the ground potential in circuit design and analysis.

[0092] In another feasible implementation, as shown in Figure 11(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.

[0093] The stable potential can be any one of the following (1)-(5): (1) the positive terminal of the power supply in the first circuit 51 (DC+ in Figure 11); (2) the negative terminal of the power supply in the first circuit 51 (DC- in Figure 11); (3) the neutral line in the second circuit 52 (N in Figure 11); (4) the live line in the second circuit 52 (L in Figure 11); (5) the intermediate potential formed by the interconnection of filter capacitors in the first circuit 51 or the second circuit 52.

[0094] Optionally, as shown in Figure 11(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. Noise loop B1 is formed in the first circuit, between the second capacitor C2 and the transformer, and noise loop B2 is formed in the second circuit, between the fourth capacitor C4 and the transformer. As shown in Figure 11(c), noise loops B3 and B4 can also be formed. Noise loop B3 is formed in the first circuit, between the third capacitor C3 and the transformer, and noise loop B4 is formed in the second circuit, between the sixth capacitor C6 and the transformer.

[0095] Furthermore, according to the definition of common-mode noise: Common-mode noise = (V1 + V2) / 2, the common-mode noise is balanced. Connecting the conductive component to the intermediate potential shown in Figure 11, using the intermediate potential as the balance point, can effectively balance the common-mode noise.

[0096] The circuit board structure 50 provided in this embodiment includes a switching device. The rapid change of the switching device generates a rapid change in current, thereby generating a magnetic field. When the circuit structure has a switching device, eddy currents are generated on the transformer core 10 based on the principle of electromagnetic induction. The magnetic core 10 is connected to a stable potential through a conductive element 20, which can act as a conductor to form a loop between the magnetic core 10 and the stable potential. The current generated on the transformer core 10 based on electromagnetic induction is introduced into the circuit loop, rather than 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.

[0097] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0098] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent disclosure. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent disclosure should be determined by the appended claims.

Claims

1. A transformer, wherein, The transformer includes: a magnetic core and conductive components; The magnetic core includes a base, and a first protrusion is provided on the first surface of the base, and a groove is provided on the outer side of the first protrusion; The conductive element is at least partially located within the groove and is electrically connected to the first protrusion.

2. The transformer according to claim 1, wherein, The conductive element is at least partially fixed within the groove by a conductive connector.

3. The transformer according to claim 2, wherein, The conductive element has a bent portion, and the position of the conductive connector corresponds to the bent portion of the conductive element.

4. The transformer according to claim 2, wherein, The conductive connector is located at the end of the groove.

5. The transformer according to claim 2, wherein, The conductive connector is a metal sheet, and the conductive component is fixed in the groove by the metal sheet.

6. The transformer according to any one of claims 1-4, wherein, The groove is cylindrical or square.

7. The transformer according to any one of claims 1-4, wherein, In the thickness direction of the first protrusion, the ratio of the depth of the groove to the thickness of the first protrusion is less than a preset ratio threshold.

8. The transformer according to any one of claims 1-4, wherein, The length of the groove along the protruding direction of the first protrusion is less than that of the first protrusion.

9. The transformer according to any one of claims 1-4, wherein, The first protrusion has a first opening, and the groove is located at a predetermined distance from the first opening.

10. The transformer according to claim 9, wherein, The transformer also includes: A fastener is disposed at the first opening, with a first portion of the fastener located inside the first protrusion and a second portion of the fastener located outside the first protrusion.

11. The transformer according to claim 10, wherein, The second part of the fixing member has a second opening, and one end of the conductive member passes through the second opening.

12. A transformer, wherein, Includes a first magnetic core, a second magnetic core, and conductive components. The first protrusion of the first magnetic core has a through groove on its outer side, and the conductive element is at least partially located in the groove and abuts against the second protrusion of the second magnetic core.

13. The transformer as claimed in claim 12, wherein, The conductive element is at least partially fixed within the groove by a conductive connector, which spans the first magnetic core and the second magnetic core.

14. A circuit board structure, wherein, The circuit board structure includes: A circuit board is provided with a first circuit and a second circuit, wherein the first circuit and / or the second circuit includes a switching device; The transformer according to any one of claims 1-11 is disposed on the circuit board, wherein the first protrusion has a first receiving space and a second receiving space, the first receiving space has a first winding, the second receiving 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 element is electrically connected to the stable potential of the circuit board.

15. The circuit board structure according to claim 14, wherein, The stable potential is the ground potential on the circuit board.

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

Images