Transformer, circuit module and electronic equipment

Abstract

The transformer comprises a magnetic core, a first winding and a second winding, the two windings are wound on the outer side of a magnetic column of the magnetic core and are both sheet-shaped conductors, the first winding comprises a first winding body, a first pin and a second pin, and when the first winding is unfolded to be in a plane shape, the first winding body has a first direction and a second direction orthogonal to the first direction; the first pin and the second pin are connected to the two opposite ends of the first winding body in the first direction respectively, and at least part of the structures of the two pins are arranged in a staggered mode in the second direction. The second winding comprises a second winding body and a third pin, the second winding body has a first direction and a second direction orthogonal to the first direction when being unfolded into a plane shape, the second winding body has a third end and a fourth end which are opposite to each other along the first direction, and the third pin is connected to the third end; the second pin and the fourth end are configured to form a common connection end or respectively serve as power supply connection ends. The heat dissipation efficiency can be improved, and the current distribution is more uniform.

Description

Technical Field

[0001] This application belongs to the field of power electronics technology, and more specifically, this application relates to a transformer, a circuit module, and an electronic device. Background Technology

[0002] Power conversion devices are electrical equipment that realizes the conversion of electrical energy form and the control of energy transfer. With the continuous increase in the demand for high current output in their application fields, power conversion devices with good heat dissipation and high current have emerged.

[0003] Existing power conversion devices mostly use coil windings, which have significant drawbacks in high-current scenarios: the wires are densely arranged and the interlayer gaps are small, so heat is easily accumulated inside the winding when a large current passes through, resulting in an increase in winding temperature; uneven wire tension during the winding process can easily lead to deviations in the accuracy of the number of winding turns and uneven current distribution. Summary of the Invention

[0004] Embodiments of this application provide a transformer, a circuit module, and an electronic device. Both the first and second windings are sheet conductors, resulting in a larger heat dissipation area, reduced heat accumulation, and improved heat dissipation efficiency. The cross-sectional area of ​​the sheet conductors is substantially uniform, allowing current to be conducted continuously and uniformly along the winding body, ensuring a stable winding current path. The connection between the first and second pins is diagonally staggered on the winding body, resulting in more uniform current distribution and reduced magnetic flux imbalance in the core.

[0005] To achieve the aforementioned technical objectives, the first aspect of this application discloses a transformer, comprising: Magnetic core, including magnetic pillars; A first winding is wound around the outside of the magnetic post. The first winding is a sheet conductor. The first winding includes a first winding body, a first pin, and a second pin. When the first winding is unfolded into a planar shape, the first winding body has a first direction and a second direction orthogonal to the first direction. The first pin and the second pin are respectively connected to a first end and a second end of the first winding body along the first direction. The first pin and the second pin are at least partially structurally misaligned in the second direction. The second winding is wound around the outside of the magnetic post. The second winding is a sheet conductor. The second winding includes a second winding body and a third pin. When the second winding is unfolded into a planar shape, the second winding body has a first direction and a second direction orthogonal to the first direction. The second winding body has a third end and a fourth end opposite to each other along the first direction. The third pin is connected to the third end. The first winding body and the second winding body are insulated from each other. After the first winding and the second winding are wound around the outside of the magnetic post, the first pin and the third pin are located on the same side of the magnetic post, and the first pin and the third pin are spaced apart along the axial direction of the magnetic post, and the second direction is parallel to the axial direction of the magnetic post; After the first winding and the second winding are wound around the outside of the magnetic post, the second pin and the fourth end of the second winding body are configured to form a common connection terminal or serve as power connection terminals respectively.

[0006] To achieve the above-mentioned technical objectives, a second aspect of this application discloses a circuit module, including the transformer and circuit board described in the first aspect. The circuit board is provided with a first switch pad, a second switch pad, and a common connection pad group. The first pin is electrically connected to the first switch pad, the third pin is electrically connected to the second switch pad, and the second pin and the fourth end of the second winding body are directly or indirectly electrically connected to the common connection pad group.

[0007] To achieve the aforementioned technical objectives, a third aspect of this application discloses an electronic device, including the transformer described in the first aspect or the circuit module described in the second aspect.

[0008] The beneficial effects of this application are as follows: The transformer, circuit module, and electronic equipment of this application feature sheet-like conductors in both the first and second windings, resulting in a larger heat dissipation area, reduced heat accumulation, and improved heat dissipation efficiency. The cross-sectional area of ​​the sheet-like conductors is essentially uniform, allowing current to be conducted continuously and evenly along the winding body, ensuring a stable winding current path. The connection between the first and second pins is diagonally staggered on the winding body, resulting in more uniform current distribution and reduced magnetic flux imbalance in the core. Attached Figure Description

[0009] Figure 1 This is an exploded view of the transformer according to an embodiment of this application.

[0010] Figure 2 This is a schematic diagram of the first and second windings in an embodiment of this application, unfolded into a planar shape.

[0011] Figure 3 This is a schematic diagram of the structure of the first winding wound on the outside of the magnetic post according to an embodiment of this application.

[0012] Figure 4 This is an exploded view of a transformer according to another embodiment of this application.

[0013] Figure 5 This is a schematic diagram of the first and second windings unfolded into a planar shape, according to another embodiment of this application.

[0014] Figure 6 This is a schematic diagram of the first and second windings unfolded into a planar structure according to another embodiment of this application.

[0015] Figure 7 This is a schematic diagram of the first and second windings unfolded into a planar shape, according to another embodiment of this application.

[0016] Figure 8 This is an exploded view of the circuit module according to an embodiment of this application.

[0017] Figure 9 This is an exploded view of a circuit module according to another embodiment of this application.

[0018] Figure 10 This is an exploded view of a circuit module according to another embodiment of this application.

[0019] In the picture, 1. Magnetic core; 11. Magnetic column; 2. First winding; 21. First winding body; 22. First pin; 23. Second pin; 3. Second winding; 31. Second winding body; 32. Third pin; 33. Fourth pin; 4. Third winding; 5. Circuit board; 51. First switch pad; 52. Second switch pad; 53. Common connection pad group; 531. First connection pad; 532. Second connection pad. Detailed Implementation

[0020] The transformer, circuit module, and electronic equipment provided in this application will be explained and described in detail below with reference to the accompanying drawings.

[0021] This embodiment specifically discloses a transformer, such as... Figure 1 As shown, it includes a magnetic core 1, a first winding 2, and a second winding 3. The magnetic core 1 includes a magnetic post 11. The magnetic core 1 can be an E-type magnetic core (such as EFD, EPC, EER, EI, etc.), an ETD-type magnetic core, a UI-type magnetic core, a can-type magnetic core, an RM-type magnetic core, or other common magnetic core types, which are selected according to the actual application scenario and performance requirements.

[0022] The transformer in this embodiment can be a push-pull transformer. One of the first winding 2 and the second winding 3 can be used as the primary winding and the other as the secondary winding, or both the first winding 2 and the second winding 3 can be used as primary windings.

[0023] The first winding 2 is wound around the outside of the magnetic post 11. The first winding 2 is a sheet conductor and includes a first winding body 21, a first pin 22, and a second pin 23. Figure 2As shown, when the first winding 2 is unfolded into a planar shape, the first winding body 21 has a first direction located within the unfolded plane and a second direction orthogonal to the first direction. Both the first and second directions are perpendicular to the thickness direction of the first winding body 21. Figure 2 and Figure 3 As shown, the first pin 22 and the second pin 23 are respectively connected to the first end and the second end of the first winding body 21 along the first direction. The first pin 22 and the second pin 23 are at least partially structurally misaligned in the second direction. "At least partially structurally misaligned in the second direction" means that when comparing the first pin 22 and the second pin 23 in the unfolded plane along the second direction, at least a portion of the first pin 22 and the second pin 23 are positioned differently in the second direction. For example, this can manifest as: the center lines of the first pin 22 and the second pin 23 not coinciding in the second direction; or the projections of the first pin 22 and the second pin 23 not at least partially overlapping in the second direction; or the boundaries of the first pin 22 and the second pin 23 being offset in the second direction, thus causing the line connecting the first pin 22 and the second pin 23 to be arranged obliquely relative to the first direction. In other words, if the two pins are considered as two point masses, the angle between the line connecting the first pin 22 and the second pin 23 and the first direction is greater than 0° and less than 180°.

[0024] The first winding body 21 can be a regular shape such as a rectangle, parallelogram, rhombus, ellipse, or circle, or it can be an irregular shape. The first pin 22 can be a sheet or a needle. The second pin 23 can be a sheet or a needle.

[0025] When the first winding body 21 has a regular shape, the first direction is the length direction of the first winding body 21, and the second direction is the width direction of the first winding body 21.

[0026] When the first winding body 21 is irregularly shaped, the first direction is the unfolding direction of the first winding body 21 after it is removed from the magnetic post 11.

[0027] The first pin 22 can be welded to the first winding body 21 or formed as a single piece, and the second pin 23 can be welded to the first winding body 21 or formed as a single piece.

[0028] The first winding 2 adopts a sheet conductor structure. Its continuous planar cross-sectional area allows the current to be evenly distributed and conducted from the second pin 23 to the first pin 22 across the entire cross-section of the sheet conductor, which can reduce local current concentration and improve heat dissipation efficiency. At the same time, the first pin 22 and the second pin 23 are at least partially structurally misaligned in the second direction of the first winding body 21, so that the current is conducted obliquely along the winding body and distributed in a dispersed manner on the axis of the magnetic column 11. This can optimize the uniformity of current distribution in the axial direction of the magnetic column 11 and reduce magnetic flux imbalance in the core. If the first winding body 21 only suffers minor local damage (without disrupting the conductor continuity), the remaining intact area can continue to carry the current, further improving the reliability of conduction.

[0029] The second winding 3 is wound around the outside of the magnetic post 11. The second winding 3 is a sheet conductor and includes a second winding body 31 and a third pin 32, such as... Figure 2 As shown, when the second winding body 31 is unfolded into a planar shape, the second winding body 31 has a first direction and a second direction orthogonal to the first direction. The second winding body 31 has a third end and a fourth end opposite to each other along the first direction, and the third pin 32 is connected to the third end of the second winding body 31. The first winding body 21 and the second winding body 31 are insulated from each other.

[0030] The second winding body 31 can be a regular shape such as a rectangle, parallelogram, rhombus, ellipse, or circle, or it can be an irregular shape. The third pin 32 can be a sheet or a needle.

[0031] When the second winding body 31 has a regular shape, the first direction is the length direction of the second winding body 31, the second direction is the width direction of the second winding body 31, and the second direction is not the thickness direction.

[0032] When the second winding body 31 is irregularly shaped, the first direction is the unfolding direction of the second winding body 31 after it is removed from the magnetic post 11.

[0033] The third pin 32 can be welded to the second winding body 31 or formed as a single piece.

[0034] The second winding 3 adopts a sheet conductor structure. Its continuous planar cross-sectional area allows the current to be evenly distributed and conducted from the second end to the third pin 32 across the entire cross-section of the sheet conductor. If the second winding body 31 suffers only minor local damage (without disrupting the conductor continuity), the remaining intact area can continue to carry the current, further improving the reliability of conduction.

[0035] In this embodiment, the first winding body 21 and the second winding body 31 are stacked. Either the first winding body 21 or the second winding body 31 can be used as the inner winding, closer to the magnetic post 11. That is, the first winding body 21 can be wound around the outside of the second winding body 31, or the second winding body 31 can be wound around the outside of the first winding body 21. An insulating layer can be provided between the first winding body 21 and the second winding body 31. The insulating layer can be an insulating tape, an insulating film (such as polyester film), an insulating cloth tape, an insulating coating, or other insulating layers known in the art.

[0036] The structure of the first winding 2 and the second winding 3 makes the current conduction path in the sheet conductor winding more uniform, avoiding the current concentration phenomenon caused by uneven wire arrangement in traditional coil windings, and reducing the risk of local overheating of the winding.

[0037] The first pin 22 and the second pin 23, which are obliquely opposite each other, can offset the current distribution blind zone in the axial direction of the magnetic column 11, so that the current can be continuously conducted along the length direction of the first winding body 21, reducing the magnetic flux imbalance problem of the magnetic core 1 caused by uneven current distribution, thereby reducing hysteresis loss and improving the energy conversion efficiency of the transformer.

[0038] The planar structure of the sheet conductor makes the interlayer gap between the first winding body 21 and the second winding body 31 more uniform, and the thickness of the insulation layer between the first winding body 21 and the second winding body 31 is easy to control, which can improve the insulation reliability between windings and avoid the risk of breakdown in high voltage scenarios. At the same time, the heat dissipation area of ​​the planar winding is increased compared with the traditional round wire winding, which can quickly conduct the heat generated during the operation of the winding to the magnetic core 1 or the external environment, solving the problem of heat accumulation in the coil winding under high current scenarios.

[0039] After the first and second windings are wound on the outside of the magnetic column, the first pin and the third pin are located on the same side of the magnetic column, and the first pin and the third pin are spaced apart along the axial direction of the magnetic column, and the second direction is parallel to the axial direction of the magnetic column.

[0040] The axially spaced layout avoids the risk of short circuits between the first pin 22 and the third pin 32 during assembly, while providing sufficient operating space for the connection between the pins and the pads on the circuit board 5. Furthermore, the spaced arrangement of the first pin 22 and the third pin 32 reduces mutual interference of current at the pin connection points, lowers contact resistance, and prevents excessively high local current density caused by pin proximity, further optimizing the transformer's conductivity. The spacing between the first pin 22 and the third pin 32 is set according to actual layout requirements.

[0041] After the first and second windings are wound around the outside of the magnetic column, the second pin 23 and the fourth end of the second winding body 31 are configured to form a common connection terminal, or to serve as power connection terminals respectively. The second pin 23 and the fourth end of the second winding body 31 can be electrically connected first to form a common connection terminal, and then connected to a power source. Alternatively, the second pin 23 and the fourth end of the second winding body 31 can be independently and spaced apart, each serving as a power connection terminal, with the second pin 23 electrically connected to one power source and the fourth end of the second winding body 31 electrically connected to another. This embodiment improves the flexibility of transformer circuit connections. When the second pin 23 and the fourth end of the second winding body 31 form a common connection terminal, the connection nodes between the transformer and external circuits can be simplified, reducing wiring complexity and lowering the risk of circuit failures caused by assembly errors. When the second pin 23 and the fourth end of the second winding body 31 serve as power connection terminals respectively, multi-path power supply or multi-load output of the transformer can be realized, adapting to the power supply needs of different modules in electronic equipment and improving the functional expandability of the transformer.

[0042] In some optional embodiments, the second pin 23 and the fourth end of the second winding body 31 are contacted and electrically connected to form a common connection terminal. Direct contact electrical connection reduces the use of intermediate connectors, lowers contact resistance, and improves current conduction efficiency. It also simplifies winding structure design, reduces the number of parts, and lowers production costs. Furthermore, the contact connection shortens the current conduction path, reducing current loss during transmission, making it particularly suitable for low-voltage, high-current scenarios and avoiding voltage drop problems caused by excessive connection resistance.

[0043] In some alternative embodiments, such as Figure 4 and Figure 5 As shown, the second winding 3 includes a fourth pin 33, which is connected to the fourth end of the second winding body 31. The fourth pin 33 is electrically connected to the second pin 23 to form a common connection terminal. The fourth pin 33 can be plate-shaped or needle-shaped.

[0044] The fourth pin 33 can be soldered to the second winding body 31 or integrally formed.

[0045] The independent fourth pin 33 can optimize the stress structure of the pin, avoid stress concentration when the second winding body 31 is directly connected to the second pin 23, and extend the service life of the winding. At the same time, the fourth pin 33 can be designed with a specific shape (such as bending or extension) according to the welding requirements, improve the compatibility with the circuit board pads, ensure welding stability, and reduce the problems of cold solder joints and desoldering caused by pin shape mismatch.

[0046] In some alternative embodiments, such as Figure 4 and Figure 5As shown, the second winding 3 includes a fourth pin 33, which is connected to the fourth end of the second winding body 31. The second pin 23 and the fourth pin 33 are spaced apart along the axial direction of the magnetic post 11 after the first winding 2 and the second winding 3 are wound around the outside of the magnetic post 11, so as to serve as power connection terminals respectively.

[0047] The fourth pin 33 can be in the form of a plate or a needle.

[0048] The fourth pin 33 can be soldered to the second winding body 31 or integrally formed.

[0049] The axially spaced dual power supply connection design allows the second pin 23 of the first winding 2 and the fourth pin 33 of the second winding 3 to serve as independent power supply connections, enabling independent power supply to the two windings or dual-path parallel power supply. This adapts to the current shunting requirements in high-current scenarios, reduces the current carrying pressure of a single pin, and avoids overheating and burning of the pin due to overcurrent. At the same time, the spaced pins can be connected to different circuit modules, realizing the reuse of transformer functions and improving the flexibility of electronic equipment circuit layout.

[0050] In some embodiments, the pins may be arranged in one of the following ways: In one embodiment, when the first winding body is wound around the outside of the magnetic post, at least a portion of the structure of the first pin 22 and at least a portion of the structure of the second pin 23 are staggered along the axial direction of the magnetic post 11, and the second direction is parallel to the axial direction of the magnetic post. That is, after the first winding 2 is wound around the outside of the magnetic post 11, the vertical projections of the first pin 22 and the second pin 23 on the magnetic post 11 may or may not overlap.

[0051] The staggered arrangement maximizes the use of the axial space of the magnetic post 11, avoids mutual obstruction between pins, and facilitates subsequent insulation treatment and assembly operations. At the same time, the staggered structure can reduce parasitic capacitance between pins, reduce capacitive coupling interference in high-frequency scenarios, optimize the high-frequency characteristics of the transformer, and is especially suitable for the transmission requirements of high-frequency switching signals in push-pull boost circuits.

[0052] In yet another embodiment, such as Figure 6 and Figure 7 As shown, when the second winding 3 includes a fourth pin 33, the third and fourth pins can be arranged in a staggered manner along the axial direction of the magnetic post 11, with the first pin 22, the second pin 23, the third pin 32, and the fourth pin 33 arranged in a staggered manner along the axial direction of the magnetic post 11. The order of the vertical projections of the first pin 22, the second pin 23, the third pin 32, and the fourth pin 33 onto the magnetic post 11 is not particularly limited.

[0053] The axial staggered arrangement creates a clear spatial interval between the four pins along the axis of the magnetic post 11, eliminating the possibility of direct contact between the pins from a physical structure perspective. It is especially suitable for low-voltage, high-current scenarios. In low-voltage, high-current scenarios, the current density is high, and the risk of short circuit can directly lead to winding burnout and equipment downtime. The staggered layout can significantly reduce such safety hazards.

[0054] The axially staggered arrangement of the four pins reduces parasitic parameter interference and optimizes high-frequency performance. During transformer operation, the distance between pins directly affects parasitic capacitance (the smaller the pin spacing, the larger the parasitic capacitance) and mutual inductance. In high-frequency applications such as push-pull boost converters, excessive parasitic capacitance or mutual inductance can cause signal interference between adjacent pins, disrupting current conduction stability. Parasitic parameters can also cause voltage spikes when the switching transistor is turned on and off, increasing device losses. The axially staggered arrangement increases the spatial distance between pins, effectively reducing parasitic capacitance and mutual inductance, minimizing high-frequency signal interference, ensuring stable current conduction along a predetermined path, adapting to low-voltage, high-current scenarios, and improving the transformer's energy conversion efficiency.

[0055] In low-voltage, high-current scenarios, pins serve as channels for current to enter and exit the windings. If they are concentrated in one area, it can lead to excessively high current density in localized areas (current concentrated in a confined space), causing overheating at the connection between the pins and their circuit board pads. Long-term use may result in pad desoldering and pin oxidation failure. Axially staggered arrangement ensures that the four pins are evenly distributed axially. Current can be dispersed and conducted through pins at different positions, reducing the current carrying capacity of each pin and resulting in a more uniform current density. This reduces localized heating, extends the lifespan of the pins and circuit board pads, and prevents accelerated aging of the insulation layer due to overheating.

[0056] The pins are arranged in an axially staggered manner to precisely match the scattered pads on the circuit board, eliminating the need for additional wires or adapter structures. This simplifies the circuit board wiring design and provides ample installation space for other components (such as filter capacitors and protection resistors), improving the compactness and layout flexibility of the overall circuit module.

[0057] The axial staggered arrangement makes the conduction path on the winding body more uniform when the current enters the winding through different pins (avoiding the current concentration in a certain area). It can be further combined with the design that the connection between the first pin 22 and the second pin 23 is at an angle to ensure that the magnetic flux distribution of the magnetic core 1 is more balanced, reduce magnetic loss, and improve the overall energy efficiency of the transformer.

[0058] In some alternative embodiments, one of the first winding body 21 and the second winding body 31 is an inner winding body closer to the magnetic post 11, and the inner winding body surrounds the magnetic post 11 at least once.

[0059] The design of the inner winding body surrounding the magnetic post 11 ensures the continuity of the magnetic circuit, reduces magnetic flux leakage, and improves magnetic coupling efficiency. At the same time, the inner winding body has a higher fit with the magnetic post 11, which can quickly conduct the heat generated by the winding to the magnetic core 1. The heat dissipation through the magnetic core 1 further optimizes the overall heat dissipation effect of the transformer. In addition, the surrounding structure of the inner winding body provides stable support for the outer winding body, avoids the outer winding from shifting during winding, ensures uniform insulation gap between windings, and reduces the risk of insulation failure.

[0060] In some alternative embodiments, after the first winding body 21 is wound around the outside of the magnetic post 11, the first end and the second end of the first winding body 21 are close to each other.

[0061] The close proximity of the two ends of the winding body can shorten the connection distance between the pins and the external circuit, reduce the wire length, and reduce line loss. At the same time, the close proximity of the ends facilitates centralized insulation protection and fixation, improves the overall compactness of the transformer structure, and adapts to the miniaturization design requirements of electronic devices. In addition, the close proximity of the two ends of the winding body can reduce magnetic field interference caused by pin dispersion, reduce leakage magnetic loss around the pins, and optimize the electromagnetic compatibility of the transformer.

[0062] In some optional embodiments, after the first winding body 21 is wound around the outside of the magnetic post 11, the distance between the first end and the second end of the first winding body 21 is 0.1mm to 1mm. 0.1mm is the minimum safe distance to avoid short circuits caused by vibration and thermal expansion between the pins connected to the ends. If the distance exceeds 1mm, the parasitic capacitance and parasitic inductance between the first end and the second end will increase significantly (excessive parasitic parameters will cause high-frequency signal crosstalk and increase switching losses), and will occupy more axial space of the magnetic post 11. This distance setting allows the current of the first pin 22 and the second pin 23 to enter and exit the first winding body synchronously, avoiding uneven current distribution caused by excessive distance, and further reducing the problem of excessive local magnetic flux density in the magnetic core 1.

[0063] The first winding body 21 has a cross-section that is annular with a first opening in the direction perpendicular to the axial direction of the magnetic post 11. The first end and the second end of the first winding body 21 are located on opposite sides of the first opening. The annulus can be circular, elliptical, or square. The width of the first opening is the distance between the first end and the second end of the first winding body 21. The first end and the second end of the first winding body 21 are spaced apart, making the cross-section of the first winding body 21 an almost closed annulus to reduce leakage inductance.

[0064] In some alternative embodiments, after the second winding body 31 is wound around the outside of the magnetic post 11, the third end and the fourth end are close to each other.

[0065] The close proximity of the two ends of the winding body can shorten the connection distance between the pins and the external circuit, reduce the wire length, and reduce line loss. At the same time, the close proximity of the ends facilitates centralized insulation protection and fixation, improves the overall compactness of the transformer structure, and adapts to the miniaturization design requirements of electronic devices. In addition, the close proximity of the two ends of the winding body can reduce magnetic field interference caused by pin dispersion, reduce leakage magnetic loss around the pins, and optimize the electromagnetic compatibility of the transformer.

[0066] In some optional embodiments, after the second winding body 31 is wound around the outside of the magnetic post 11, the distance between the third and fourth ends is 0.1~1mm. 0.1mm is the minimum safe distance to avoid short circuits caused by vibration and thermal expansion between the pins connected to the ends. If the distance exceeds 1mm, the parasitic capacitance and parasitic inductance between the third and fourth ends will increase significantly (excessive parasitic parameters will cause high-frequency signal crosstalk and increase switching losses), and will occupy more axial space of the magnetic post 11. This distance setting allows the current of the third pin 32 and the fourth pin 33 to enter and exit the winding body synchronously, avoiding uneven current distribution caused by excessive distance, and further reducing the problem of excessive local magnetic flux density in the magnetic core 1.

[0067] The second winding body 31 has a cross-section in the direction perpendicular to the axial direction of the magnetic post 11 that is annular with a second opening. The third and fourth ends are located on either side of the second opening. The annulus can be circular, elliptical, or square. The width of the second opening is the distance between the third and fourth ends. The first and second openings face the same direction. The third and fourth ends of the second winding body are spaced apart, making the cross-section of the second winding body 31 an almost closed annulus to reduce leakage inductance.

[0068] The spacing between the first and second terminals, and between the third and fourth terminals, should be set as small as possible while ensuring circuit safety, in order to reduce leakage inductance.

[0069] In some optional embodiments, the first winding 2 is bent around the outside of the magnetic core 11, and the first pin 22 and the second pin 23 are welded to or integrally formed with the first winding body 21. The first winding 2 can be processed into a bent shape and then sleeved on the magnetic core 11, or the first winding 2 can be processed into a flat sheet shape and then wound on the magnetic core 11. The bent winding can make the first winding 2 fit the curved structure of the magnetic core 11 more closely, increase the direct or indirect contact area between the first winding 2 and the magnetic core 1, enhance the magnetic coupling effect, and at the same time reduce the air gap between the winding and the magnetic core 11, thereby reducing magnetic resistance.

[0070] In some alternative embodiments, the second winding 3 is bent around the outside of the magnetic core 11, and the third pin 32 and the fourth pin 33 are welded to or integrally formed with the second winding body 31. The second winding 3 can be processed into a bent shape and then sleeved on the magnetic core 11, or the second winding 3 can be processed into a flat sheet shape and then wound on the magnetic core 11. The bent winding allows the second winding 3 to fit more closely to the curved structure of the magnetic core 11, increasing the direct or indirect contact area between the second winding 3 and the magnetic core 1, enhancing the magnetic coupling effect, while reducing the air gap between the winding and the magnetic core 11 and reducing magnetic resistance.

[0071] In some optional embodiments, both the first winding 2 and the second winding 3 are bent and wrapped around the outside of the magnetic post 11, and both the first winding 2 and the second winding 3 are integrally formed. The first winding 2 can be processed into a bent shape and then sleeved on the magnetic post 11, or the first winding 2 can be processed into a flat sheet shape and then wound on the magnetic post 11. The second winding 3 can be processed into a bent shape and then sleeved on the magnetic post 11, or the second winding 3 can be processed into a flat sheet shape and then wound on the magnetic post 11.

[0072] The bent winding design allows the winding to better fit the curved surface structure of the magnetic post 11, increasing the contact area between the winding and the magnetic core 1, enhancing the magnetic coupling effect, and reducing the air gap between the winding and the magnetic post 11, thus reducing magnetic resistance. The integrally formed winding structure avoids the connection resistance during traditional winding splicing, improves the continuity of current conduction, reduces the risk of heat generation at the splicing point, simplifies the manufacturing process, improves the consistency and reliability of the winding, and reduces the performance differences of the winding caused by assembly errors.

[0073] The first winding 2 can be made of copper foil or other metal, and the second winding 3 can also be made of copper foil or other metal. The first winding 2 can be formed in one piece by cutting a metal sheet, with the two ends of the metal sheet extending to form the first pin 22 and the second pin 23. The second winding 3 can also be formed in one piece by cutting a metal sheet, with the two ends of the metal sheet extending to form the third pin 32 and the fourth pin 33. This simplifies the process, eliminating the need for manual soldering of leads compared to coil windings. The integrated metal sheet reduces the number of solder joints, provides high mechanical strength, and offers excellent conductivity.

[0074] In some optional embodiments, at least one of the first winding 2 and the second winding 3 is configured as a multi-layer winding; the winding body of the multi-layer winding includes multiple sub-winding bodies stacked along the thickness direction of the winding, the thickness direction being perpendicular to both the first direction and the second direction when the winding body is unfolded. An insulating layer is provided between adjacent sub-winding bodies to ensure electrical isolation. The winding directions of the multiple sub-winding bodies are consistent, and the corresponding ends of each sub-winding body (e.g., first end to first end, second end to second end) are connected in parallel to form a multi-layer parallel structure. This multi-layer parallel structure can significantly improve the current carrying capacity of the winding and is suitable for high-current applications.

[0075] The insulation layer between adjacent sub-winding bodies can be an insulating layer known in the art, such as insulating tape, insulating film (e.g., polyester film), insulating cloth tape, insulating coating, etc.

[0076] In one embodiment, the first winding 2 is a multi-layer winding, and the second winding 3 is a single-layer winding.

[0077] In another embodiment, the first winding 2 is a single-layer winding, and the second winding 3 is a multi-layer winding.

[0078] In another embodiment, the first winding 2 is a multi-layer winding, and the second winding 3 is a multi-layer winding.

[0079] Multi-layer winding design can increase the number of turns or cross-sectional area of ​​the winding within the limited space of the magnetic pillar 11, adapting to different needs of high voltage and high current: when high voltage output is required, the number of turns of the sub-winding body can be increased; when high current output is required, the cross-sectional area of ​​the sub-winding body can be increased. The insulation layer between adjacent sub-windings can ensure interlayer electrical isolation and avoid interlayer breakdown. At the same time, the insulation layer can be made of materials with excellent thermal conductivity (such as ceramic-based insulating sheets), which can assist in heat dissipation while achieving insulation. Combined with the high heat dissipation characteristics of the sheet conductor, it solves the problem of heat accumulation in multi-layer windings. The electrical connection of the same end of the multi-layer sub-windings can realize the parallel conduction of current, reduce the current carrying pressure of a single-layer winding, and improve the overcurrent capacity of the winding.

[0080] In one embodiment, the same end of multiple sub-winding bodies is in contact and electrically connected, and the connection end of the multiple sub-winding bodies is electrically connected to a pin, which has a single-layer structure.

[0081] In another embodiment, the pins of the multilayer winding include a plurality of sub-pins matching the number of sub-winding bodies, with each sub-pin extending to form an electrical connection with a sub-winding body.

[0082] The one-to-one sub-pin design ensures that the current in each sub-winding body is conducted independently, avoiding the failure of the entire winding due to a single pin failure, and improving the redundancy and reliability of the transformer. At the same time, multiple sub-pins can distribute the current load, reduce the current density of a single sub-pin, reduce pin heat generation, and extend pin life. In addition, the independent design of sub-pins facilitates the individual testing of the performance of each sub-winding, reduces the difficulty of fault diagnosis, and improves the efficiency of quality control in the production process.

[0083] In some alternative embodiments, such as Figure 4As shown, the transformer also includes a third winding 4, which is wound around the outside of the magnetic post 11. The first winding 2, the second winding 3, and the third winding 4 are insulated from each other. The third winding 4 can be a coil winding or a sheet conductor. When the third winding is a sheet conductor, its structural design can be the same as the first winding, and will not be described further here. When the third winding 4 is a coil winding, it is closer to the magnetic post 11 than the first winding 2 and the second winding 3. The addition of the third winding 4 is adapted to a push-pull circuit structure. Two of the first winding 2, the second winding 3, and the third winding 4 serve as primary windings, and the remaining one serves as a secondary winding.

[0084] The addition of the third winding 4 enables the transformer to have multi-winding output capabilities, adapting to the multi-voltage power supply requirements of different modules in electronic equipment without the need for an additional independent transformer, simplifying the circuit structure of electronic equipment and reducing overall size and cost. At the same time, the third winding 4 can serve as an auxiliary winding to realize functions such as voltage feedback and current detection, improving the control accuracy of the transformer. For example, by collecting the output voltage signal through the third winding 4, closed-loop control of the push-pull circuit can be achieved, optimizing the stability of the output voltage. The insulation between the windings ensures electrical isolation between each winding, preventing interference or breakdown between windings of different voltage levels, and improving the safety performance of the transformer.

[0085] This application also discloses a circuit module, such as... Figure 8 As shown, the circuit includes the transformer and circuit board 5 described in the above embodiment. The circuit board 5 is provided with a first switch pad 51, a second switch pad 52, and a common connection pad group 53. A first pin 22 is electrically connected to the first switch pad 51, a third pin 32 is electrically connected to the second switch pad 52, and a second pin 23 and the fourth end of the second winding body 31 are directly or indirectly electrically connected to the common connection pad group 53, respectively. The second pin 23 and the fourth end of the second winding body 31 can be independent of each other and then both directly electrically connected to the common connection pad group 53. Alternatively, the second pin 23 and the fourth end of the second winding body 31 can be electrically connected first (e.g., by welding or integral molding) to form a common terminal, and then the common terminal is electrically connected to the common connection pad group 53. The pins and pads can be electrically connected by insertion, bonding, or welding.

[0086] This connection method enables precise docking between the transformer and circuit board 5. The switch pad settings are adapted to the connection requirements of switching transistors (such as MOSFETs) in the circuit, reducing the wire length between the pins and the switching transistors, reducing parasitic inductance of the lines, avoiding voltage spikes during high-frequency switching, and protecting the switching transistor devices. The common connection pad group 53 can realize centralized connection of multiple pins, simplifying the wiring of circuit board 5, improving the regularity of the circuit layout, and facilitating subsequent maintenance and repair. The flexibility of direct or indirect electrical connection can adapt to different circuit design requirements. For example, in indirect connection, current filtering, voltage regulation and other functions can be achieved through components such as resistors and capacitors, further optimizing the performance of the circuit module.

[0087] In some alternative embodiments, such as Figure 9 As shown, the second winding 3 includes a fourth pin 33, which is connected to the fourth end of the second winding body 31. The fourth pin 33 and the second pin 23 are electrically connected to the common connection pad group 53. The second pin 23 and the fourth pin 33 can be electrically connected (e.g., soldered or integrally formed) to form a common terminal, and then the common terminal is electrically connected to the common connection pad group 53. The second pin 23 and the fourth pin 33 can be independent of each other and electrically connected to the common connection pad group 53 respectively.

[0088] The connection between the two pins and the common connection pad group 53 enables parallel input and output of current, improving the current carrying capacity of the pads and preventing burnout of a single pad due to overcurrent. At the same time, the two-pin connection reduces the contact resistance between the pins and the pads, improving current conduction efficiency, especially suitable for high-current scenarios. In addition, the redundant design of the two pins ensures that even if one pin fails, the other pin can still maintain circuit conduction, improving the reliability of the circuit module.

[0089] In some alternative embodiments, such as Figure 10 As shown, the second winding 3 includes a fourth pin 33, which is connected to the fourth end of the second winding body 31; the second pin 23 and the fourth pin 33 are spaced apart along the axial direction of the magnetic post 11; the common connection pad group 53 includes a first connection pad 531 and a second connection pad 532, the second pin 23 is electrically connected to the first connection pad 531, and the fourth pin 33 is electrically connected to the second connection pad 532.

[0090] The spaced pins, in conjunction with independent connection pads, enable dual-channel connection between the transformer and circuit board 5, adapting to multi-path circuit designs. For example, the first connection pad 531 connects to the main power supply circuit, and the second connection pad 532 connects to the backup power supply circuit, improving the power supply stability of the circuit module. At the same time, the independent pads can reduce signal interference between different pins, especially when the pins transmit signals of different frequencies or voltage levels, avoiding circuit failures caused by signal crosstalk and optimizing the electromagnetic compatibility of the circuit module.

[0091] In some optional embodiments, the first switch pad 51, the second switch pad 52, the first connection pad 531, and the second connection pad 532 are arranged in a rectangular shape. The first switch pad 51 and the first connection pad 531 are arranged diagonally, the second switch pad 52 and the second connection pad 532 are arranged diagonally, the first pin 22 and the second pin 23 are staggered along the axial direction of the magnetic post 11, and the third pin 32 and the fourth pin 33 are staggered along the axial direction of the magnetic post 11.

[0092] The combination of diagonal pads and staggered pins allows current to flow into the winding from the first connecting pad 531 (second pin 23) and out from the first switching pad 51 (first pin 22), and into the second connecting pad 532 (fourth pin 33) and out from the second switching pad 52 (third pin 32), forming two symmetrical and independent current paths, preventing the two paths from converging in the same area. The axially staggered pins further disperse the current entry and exit positions, making the current conduction along the winding body more uniform, reducing the problem of excessively high local current density in the winding. Combined with the diagonal distribution of the pads, it reduces the risk of current concentration at the pad soldering points, thereby reducing local heat generation and extending the life of the circuit module.

[0093] The diagonally arranged pads increase the distance between the first switch pad 51 and the second switch pad 52, and between the first connection pad 531 and the second connection pad 532 (the diagonal distance of the rectangle is greater than the distance between adjacent sides), which can significantly reduce the parasitic capacitance between switch pads and between connection pads, and avoid crosstalk of high-frequency switching signals between pads; the axially staggered pins increase the spatial distance between pins, further reducing the parasitic inductance between pins (according to the principle of electromagnetics, parasitic inductance is positively correlated with the conductor spacing), avoiding voltage spikes when the switching transistor is turned on and off, reducing switching losses, optimizing high-frequency performance, and improving energy conversion efficiency.

[0094] The symmetrical diagonal pads ensure a more symmetrical distribution of current across the wafer winding body as it flows through the first pin 22 and the third pin 32 into the winding. The axially staggered pins prevent excessive current concentration at the same end of the winding, ensuring a more uniform magnetic flux distribution around the core 1, reducing hysteresis losses, and further improving the overall efficiency of the transformer.

[0095] In some optional embodiments, the first switch pad 51, the first connection pad 531, the second switch pad 52, and the second connection pad 532 are staggered along the axial direction of the magnetic post 11, and the first pin 22, the third pin 32, the second pin 23, and the fourth pin 33 are staggered along the axial direction of the magnetic post 11.

[0096] The pads are axially staggered, creating a clear axial spacing between the first switch pad 51, the first connection pad 531, the second switch pad 52, and the second connection pad 532 on the circuit board 5, preventing solder bridging (where adjacent pads are connected by solder). The pins are also axially staggered, further increasing the spatial distance between them and significantly reducing the risk of direct pin contact. This double staggering provides safe pad-pin isolation, making it particularly suitable for low-voltage, high-current scenarios where a short circuit can instantly generate a large current that burns out windings or pads; the double staggered layout significantly reduces this risk of fatal failures.

[0097] The four pads are staggered axially so that when current flows in from the first switch pad 51 (connected to the first pin 22) and the second switch pad 52 (connected to the third pin 32), the connection points on the circuit board 5 do not overlap, thus avoiding current convergence in the same area. The four pins are staggered axially so that when current enters the sheet winding body from the pins, the conduction path is dispersed along the axis of the magnetic post 11 (rather than concentrated at the same end of the winding). Combined with the characteristics of the sheet conductor of "uniform cross-sectional area and continuous current conduction", this further ensures that the current is evenly distributed on the winding body. Ultimately, this achieves a balanced current density throughout the "pad-pin-winding" path, reduces local overheating, and extends the service life of the circuit module.

[0098] The axial misalignment of the pads increases the spatial distance between adjacent pads (such as the first switch pad 51 and the first connection pad 531, and the second switch pad 52 and the second connection pad 532), directly reducing the parasitic capacitance between the pads. The axial misalignment of the pins further increases the spacing between adjacent pins (such as the first pin 22 and the third pin 32, and the second pin 23 and the fourth pin 33), reducing the parasitic inductance between the pins. This double misalignment significantly reduces parasitic interference in high-frequency scenarios, ensuring stable operation of the switching transistors and improving the high-frequency energy conversion efficiency of the transformer.

[0099] The staggered pins prevent current from being excessively concentrated at the same end of the winding, ensuring a more uniform magnetic flux distribution around the magnetic core 1 (without areas of excessively high local magnetic flux density), and reducing hysteresis loss and leakage flux.

[0100] This application also discloses an electronic device, including the transformer or circuit module described in the above embodiments. After integrating this transformer, the electronic device can achieve stable operation under high current conditions through the high heat dissipation characteristics of the sheet conductor windings and the low leakage flux design of the magnetic core 1, avoiding performance degradation caused by overheating or magnetic flux imbalance in traditional coil winding transformers.

[0101] Electronic devices can include energy storage devices, mobile terminals (such as tablets, laptops, or mobile phones), smart home devices (such as power supply modules for smart robotic vacuum cleaners and home air purifiers), industrial power supply equipment, medical devices, and auxiliary equipment for communication base stations.

[0102] In the description of this application, 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", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0103] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "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 application according to the specific circumstances.

[0104] In the description of this specification, the references to terms such as "this embodiment," "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any at least one embodiment or example. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0105] 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 application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0106] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and simple improvements made to the substantive content of this application should be included within the protection scope of this application.

Claims

1. A transformer, characterized in that, include: Magnetic core, including magnetic pillars; A first winding is wound around the outside of the magnetic post. The first winding is a sheet conductor. The first winding includes a first winding body, a first pin, and a second pin. When the first winding is unfolded into a planar shape, the first winding body has a first direction and a second direction orthogonal to the first direction. The first pin and the second pin are respectively connected to a first end and a second end of the first winding body along the first direction. The first pin and the second pin are at least partially structurally misaligned in the second direction. The second winding is wound around the outside of the magnetic post. The second winding is a sheet conductor. The second winding includes a second winding body and a third pin. When the second winding is unfolded into a planar shape, the second winding body has a first direction and a second direction orthogonal to the first direction. The second winding body has a third end and a fourth end opposite to each other along the first direction. The third pin is connected to the third end. The first winding body and the second winding body are insulated from each other. After the first winding and the second winding are wound around the outside of the magnetic post, the first pin and the third pin are located on the same side of the magnetic post, and the first pin and the third pin are spaced apart along the axial direction of the magnetic post, and the second direction is parallel to the axial direction of the magnetic post; After the first winding and the second winding are wound around the outside of the magnetic post, the second pin and the fourth end of the second winding body are configured to form a common connection terminal or serve as power connection terminals respectively.

2. The transformer according to claim 1, characterized in that, The second pin and the fourth end of the second winding body make contact and are electrically connected to form the common connection terminal.

3. The transformer according to claim 1, characterized in that, The second winding includes a fourth pin, which is connected to the fourth end of the second winding body and electrically connected to the second pin to form the common connection terminal.

4. The transformer according to claim 1, characterized in that, The second winding includes a fourth pin, which is connected to the fourth end of the second winding body. The second pin and the fourth pin are spaced apart along the axial direction of the magnetic post after the first winding and the second winding are wound around the outside of the magnetic post, so as to serve as the power connection terminals respectively.

5. The transformer according to claim 1, characterized in that, When the first winding body is wound around the outside of the magnetic post, at least a portion of the structure of the first pin and at least a portion of the structure of the second pin are staggered along the axial direction of the magnetic post, and the second direction is parallel to the axial direction of the magnetic post.

6. The transformer according to claim 4, characterized in that, The first pin, the second pin, the third pin, and the fourth pin are staggered along the axial direction of the magnetic column.

7. The transformer according to any one of claims 1-6, characterized in that, One of the first winding body and the second winding body is an inner winding body closer to the magnetic post, and the inner winding body surrounds the magnetic post at least once.

8. The transformer according to any one of claims 1-6, characterized in that, After the first winding body is wound around the outside of the magnetic post, the first end and the second end are close to each other, and / or, after the second winding body is wound around the outside of the magnetic post, the third end and the fourth end are close to each other.

9. The transformer according to claim 8, characterized in that, After the first winding body is wound around the outside of the magnetic post, the distance between the first end and the second end is 0.1mm~1mm, and / or, After the second winding body is wound around the outside of the magnetic post, the distance between the third end and the fourth end is 0.1mm~1mm.

10. The transformer according to claim 1, characterized in that, The first winding and / or the second winding are bent around the outside of the magnetic post; and / or the first winding and / or the second winding are integrally formed.

11. The transformer according to claim 1, characterized in that, At least one of the first winding and the second winding is configured as a multi-layer winding. The winding body of the multi-layer winding includes a plurality of stacked sub-winding bodies. An insulating layer is provided between adjacent sub-winding bodies, and the same end of the plurality of sub-winding bodies is electrically connected.

12. The transformer according to claim 1, characterized in that, It also includes a third winding, which is wound around the outside of the magnetic post, and the first winding, the second winding and the third winding are insulated from each other.

13. A circuit module, characterized in that, The transformer and circuit board according to any one of claims 1-12 are provided on the circuit board, wherein a first switch pad, a second switch pad and a common connection pad group are provided, the first pin is electrically connected to the first switch pad, the third pin is electrically connected to the second switch pad, and the second pin and the fourth end of the second winding body are directly or indirectly electrically connected to the common connection pad group.

14. The circuit module according to claim 13, characterized in that, The second winding includes a fourth pin, which is connected to the fourth end of the second winding body, and the fourth pin and the second pin are electrically connected to the common connection pad group.

15. The circuit module according to claim 13, characterized in that, The second winding includes a fourth pin, which is connected to the fourth end of the second winding body. The second pin and the fourth pin are spaced apart along the axial direction of the magnetic column. The common connection pad group includes a first connection pad and a second connection pad, the second pin is electrically connected to the first connection pad, and the fourth pin is electrically connected to the second connection pad.

16. An electronic device, characterized in that, It includes the transformer as described in any one of claims 1-12 or the circuit module as described in any one of claims 13-15.

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