High frequency transformer and switching power supply

Abstract

The application discloses a high-frequency transformer and a switching power supply, and relates to the technical field of transformers. The high-frequency transformer comprises a framework main body, and a first main winding, a secondary winding, a combined winding, a second shielding winding and a second main winding are wound on the framework main body; the first main winding is located between the combined winding and the framework main body; the combined winding is located between the first main winding and the secondary winding; the secondary winding is located between the combined winding and the second shielding winding; the second shielding winding is located between the secondary winding and the second main winding; the combined winding is composed of a feedback winding and a first shielding winding; the wire diameter of the secondary winding is greater than that of the first main winding, the wire diameter of the first main winding is equal to that of the second main winding; and the number of wire turns of the secondary winding is less than that of the first main winding. The high-frequency transformer is compact in structure, the volume can be reduced, and thus the miniaturization design of the switching power supply is facilitated.

Description

Technical Field

[0001] This application relates to the field of high-frequency transformer technology, and in particular to a high-frequency transformer and a switching power supply. Background Technology

[0002] High-frequency transformers are power transformers that operate at frequencies exceeding 10kHz, utilizing the principle of electromagnetic induction to convert and transmit electrical energy. Their core value lies in their high-frequency operating characteristics, offering advantages over power-frequency transformers such as smaller size, higher efficiency, and higher power density, making them the core of energy conversion in modern power electronic equipment.

[0003] High-frequency transformers are commonly used in switching power supplies. However, with technological advancements, there is a growing trend towards miniaturized switching power supplies. In related technologies, high-frequency transformers typically have each functional winding forming a separate coil layer. This often results in a less compact structure and a larger size, hindering the miniaturization of switching power supplies. Utility Model Content

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a high-frequency transformer and a switching power supply. The high-frequency transformer has a compact structure, which can reduce its size, thereby facilitating the miniaturization design of the switching power supply.

[0005] A high-frequency transformer according to a first aspect embodiment of this application includes:

[0006] A frame body, on which a first main winding, a secondary winding, a combined winding, a second shielding winding, and a second main winding are wound; the first main winding is located between the combined winding and the frame body; the combined winding is located between the first main winding and the secondary winding; the secondary winding is located between the combined winding and the second shielding winding; the second shielding winding is located between the secondary winding and the second main winding; the combined winding consists of a feedback winding and a first shielding winding; the conductor diameter of the secondary winding is larger than the conductor diameter of the first main winding, the conductor diameter of the first main winding is equal to the conductor diameter of the second main winding; and the number of coils in the secondary winding is less than the number of coils in the first main winding.

[0007] The high-frequency transformer according to the embodiments of this application has at least the following beneficial effects: The high-frequency transformer of the embodiments of this application can be applied in a switching power supply. When applied in a switching power supply, the first main winding and the second main winding are used to receive the input voltage. For example, the first main winding and the second main winding can be respectively connected to the pulse current output by the two switching transistors of the switching power supply. The secondary winding can serve as the output terminal of the transformer, converting the energy transmitted from the first main winding and the second main winding into the required output voltage and current through electromagnetic induction to supply the load. The feedback winding in the combined winding is used to power the relevant chips of the switching power supply. The first shielding winding and the second shielding winding are used to suppress electromagnetic interference. In the high-frequency transformer of the embodiments of this application, the first shielding winding and the feedback winding are combined to form a combined winding, forming only one coil layer, which can reduce the number of coil layers, thereby reducing the size of the high-frequency transformer and benefiting the miniaturization design of the switching power supply. Furthermore, since the conductor diameter of the secondary winding is larger than that of the first primary winding, and the conductor diameter of the first primary winding is equal to that of the second primary winding, the number of coils in the secondary winding is less than that in the first primary winding. This reduces the interlayer capacitance between the secondary winding and the first primary winding, as well as between the secondary winding and the second primary winding, thereby suppressing common-mode noise.

[0008] According to some embodiments of the first aspect of this application, an insulating layer is provided between the first main winding and the secondary winding; an insulating layer is provided between the secondary winding and the merging winding; an insulating layer is provided between the merging winding and the shielding winding; and an insulating layer is provided between the second shielding winding and the second main winding.

[0009] According to some embodiments of the first aspect of this application, it further includes a first frame, a second frame, a third frame, and a fourth frame. The first frame and the second frame are respectively disposed on opposite sides of the end face of the frame body; the third frame and the fourth frame are respectively disposed on opposite sides of the bottom surface of the frame body; the first frame is provided with a first pin, a second pin, a third pin, and a fourth pin; the second frame is provided with a ninth pin, a tenth pin, and an eleventh pin; the third frame is provided with a fifth pin and a sixth pin; the third frame is further provided with an extension portion extending away from the frame body, the extension portion being provided with a seventh pin and an eighth pin.

[0010] According to some embodiments of the first aspect of this application, one end of the first frame is connected to the third frame via a first connecting plate; the other end of the first frame is connected to the third frame via a second connecting plate, and the first connecting plate and the second connecting plate form a first groove;

[0011] One end of the third frame is connected to the fourth frame via a third connecting plate; the other end of the third frame is connected to the fourth frame via a fourth connecting plate, and the third connecting plate and the fourth connecting plate form a second groove.

[0012] According to some embodiments of the first aspect of this application, a magnetic core is further included, the magnetic core comprising a first magnetic core and a second magnetic core; the first magnetic core is provided with a first recess that matches the first connecting plate, the first magnetic core is provided with a second recess that matches the second connecting plate, and the first magnetic core is provided with a first protrusion that matches the first slot; the first recess is engaged with the first connecting plate, the second recess is engaged with the second connecting plate, and the first protrusion is engaged with the first slot.

[0013] The second magnetic core has a third recess that matches the third connecting plate, a fourth recess that matches the fourth connecting plate, and a second protrusion that matches the second slot; the third recess is engaged with the third connecting plate, the fourth recess is engaged with the fourth connecting plate, and the second protrusion is engaged with the second slot.

[0014] According to some embodiments of the first aspect of this application, the starting point of the conductor of the first main winding is connected to the fifth pin, and the ending point of the conductor of the first main winding is connected to the eleventh pin; the starting point of the conductor of the feedback winding is connected to the second pin, and the ending point of the conductor of the feedback winding is connected to the first pin; the starting point of the conductor of the first shielding winding is connected to the first pin, and the ending point of the conductor of the first shielding winding is connected to the ninth pin; the starting point of the conductor of the secondary winding is connected to the seventh pin, and the ending point of the conductor of the secondary winding is connected to the eighth pin; the starting point of the conductor of the second shielding winding is connected to the first pin, and the ending point of the conductor of the second shielding winding is connected to the tenth pin; the starting point of the conductor of the second main winding is connected to the eleventh pin, and the ending point of the conductor of the second main winding is connected to the third pin.

[0015] According to some embodiments of the first aspect of this application, the first frame is provided with a plurality of first wire slots, and the first pin, the second pin, the third pin and the fourth pin respectively correspond to a first wire slot; the second frame is provided with a plurality of second wire slots, and the ninth pin, the tenth pin and the eleventh pin respectively correspond to a second wire slot.

[0016] According to some embodiments of the first aspect of this application, the number of coils in the first main winding is 22.5; the number of coils in the secondary winding is 4.

[0017] According to some embodiments of the first aspect of this application, the number of coils in the feedback winding is 9; the number of coils in the first shielding winding is 9; the number of coils in the second shielding winding is 13; and the number of coils in the second main winding is 20.

[0018] A second aspect of this application provides a switching power supply, including a high-frequency transformer as described in any one of the first aspects of the embodiment.

[0019] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0020] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a cross-sectional schematic diagram of each winding of the high-frequency transformer according to an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the high-frequency transformer according to an embodiment of this application, with each wire group omitted.

[0023] Figure 3 This is a schematic diagram of the structure of the high-frequency transformer according to an embodiment of this application;

[0024] Figure 4 This is a schematic diagram of the high-frequency transformer from another angle, representing an embodiment of this application.

[0025] Figure 5 This is a schematic diagram of the equivalent circuit of the high-frequency transformer in an embodiment of this application;

[0026] Figure 6 This is an exploded view of the high-frequency transformer according to an embodiment of this application;

[0027] Figure 7 This is an exploded view of the high-frequency transformer according to an embodiment of this application.

[0028] Figure label:

[0029] Magnetic core 100; First magnetic core 101; First recess 1011; Second recess 1012; First convex portion 1013; Second magnetic core 102; Third recess 1021; Fourth recess 1022; Second convex portion 1023; First pin 1; Second pin 2; Third pin 3; Fourth pin 4; Fifth pin 5; Sixth pin 6; Seventh pin 7; Eighth pin 8; Ninth pin 9; Tenth pin 10; Eleventh pin 11; First frame 110; First wire groove 111; Second frame 120; Second wire groove 121; Third frame 130; Fourth frame 140; Extension 141; Frame body 150; Insulating layer 160; First connecting plate 171; Second connecting plate 172; Third connecting plate 173; Fourth connecting plate 174. Detailed Implementation

[0030] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0031] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this application.

[0032] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0033] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0034] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "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 any suitable manner in one or more embodiments or examples.

[0035] Reference Figures 1 to 5 The first aspect of this application provides a high-frequency transformer, including a frame body 150. A first main winding, a secondary winding, a merging winding, a second shielding winding, and a second main winding are wound on the frame body 150. The first main winding is located between the merging winding and the frame body 150. The merging winding is located between the first main winding and the secondary winding. The secondary winding is located between the merging winding and the second shielding winding. The second shielding winding is located between the secondary winding and the second main winding. The merging winding consists of a feedback winding and a first shielding winding. The conductor diameter of the secondary winding is larger than the conductor diameter of the first main winding, and the conductor diameter of the first main winding is equal to the conductor diameter of the second main winding. Furthermore, the number of coils in the secondary winding is less than the number of coils in the first main winding.

[0036] The high-frequency transformer according to the embodiments of this application has at least the following beneficial effects: The high-frequency transformer of the embodiments of this application can be applied in a switching power supply. When applied in a switching power supply, the first main winding and the second main winding are used to receive the input voltage. For example, the first main winding and the second main winding can be respectively connected to the pulse current output by the two switching transistors of the switching power supply. The secondary winding can serve as the output terminal of the transformer, converting the energy transmitted from the first main winding and the second main winding into the required output voltage and current through electromagnetic induction to supply the load. The feedback winding in the combined winding is used to power the relevant chips of the switching power supply. The first shielding winding and the second shielding winding are used to suppress electromagnetic interference. In the high-frequency transformer of the embodiments of this application, the first shielding winding and the feedback winding are combined to form a combined winding, forming only one layer of coil, which can reduce the number of coil layers, thereby reducing the size of the high-frequency transformer and benefiting the miniaturization design of the switching power supply. Furthermore, since the conductor diameter of the secondary winding is larger than that of the first primary winding, and the conductor diameter of the first primary winding is equal to that of the second primary winding, the number of coils in the secondary winding is less than that in the first primary winding. This reduces the interlayer capacitance between the secondary winding and the first primary winding, as well as between the secondary winding and the second primary winding, thereby suppressing common-mode noise.

[0037] It should be noted that the first main winding, the secondary winding, the combined winding, the second shielding winding, and the second main winding each form a coil layer. Therefore, the high-frequency transformer in this embodiment of the application forms a total of 5 coil layers.

[0038] It is worth noting that the first main winding is formed by a wire with a diameter of 0.23 mm wrapped around the skeleton body 150; the second main winding is formed by a wire with a diameter of 0.23 mm wrapped around the outside of the second shielding winding.

[0039] In some embodiments, the number of coils in the first main winding is 22.5; the number of coils in the secondary winding is 4; the number of coils in the feedback winding is 9; the number of coils in the first shielding winding is 9; the number of coils in the second shielding winding is 13; and the number of coils in the second main winding is 20. This configuration allows for a smaller interlayer capacitance between the secondary winding and the first main winding in the high-frequency transformer of this embodiment, and also reduces the interlayer capacitance between the secondary winding and the second main winding, thereby suppressing common-mode noise. It should be noted that the number of coils refers to the number of turns of the wire. For example, the wire of the first main winding is wound 22 turns around the frame body and then another half turn, therefore the number of coils in the first main winding is 22.5.

[0040] In some embodiments, the secondary winding is formed by winding a 0.75 mm diameter wire around the outside of the combined winding. The 0.75 mm diameter wire of the secondary winding enables the secondary winding to withstand a 2 A current.

[0041] In some embodiments, the first shielding winding includes two wires; the second shielding winding includes two wires; and the feedback winding includes one wire. The two wires of the first shielding winding and the one wire of the feedback winding are wound in parallel to form a coil layer.

[0042] It is worth noting that the diameter of both wires in the first shielding winding is 0.17 mm, and the diameter of the wire in the feedback winding is also 0.17 mm. The diameter of both wires in the second shielding winding is 0.15 mm.

[0043] It should be noted that the winding directions of the conductors of the first main winding, secondary winding, merging winding, second shielding winding, and second main winding are the same.

[0044] It is worth noting that, referring to Figure 5 and Figure 1 , Figure 1 This is a cross-sectional schematic diagram of each winding of the high-frequency transformer according to an embodiment of this application; Figure 5 This is a schematic diagram of the equivalent circuit of the high-frequency transformer in an embodiment of this application. Figure 1 The cross-section shown is merely an equivalent cross-sectional diagram of a portion of the high-frequency transformer structure, and Figure 1The cross-section of the conductor in the diagram is partially solid (i.e., the black portion), indicating the starting end of the conductor. N1 represents the first main winding, N2 represents the feedback winding, N3 represents the first shielding winding, N4 represents the secondary winding, N5 represents the second shielding winding, and N6 represents the second main winding.

[0045] In some embodiments, an insulating layer 160 is provided between the first main winding and the secondary winding; an insulating layer 160 is provided between the secondary winding and the merging winding; an insulating layer 160 is provided between the merging winding and the shielding winding; and an insulating layer 160 is provided between the second shielding winding and the second main winding. An additional insulating layer 160 is provided on the outer side of the second main winding.

[0046] It is worth noting that the insulation layer 160 can be Mylar tape, which serves as insulation and helps to fix the wires of each winding, preventing them from becoming loose. It also forms a flat surface on the outer side of the winding, allowing for neater and tighter winding of the outermost windings. For example, the insulation layer 160 between the first main winding and the secondary winding forms a flat surface on the outer side of the first main winding, facilitating the winding of the secondary winding. The insulation layer 160 can be a single layer of Mylar tape or composed of multiple layers of Mylar tape.

[0047] In some embodiments, refer to Figures 2 to 4 It also includes a first frame 110, a second frame 120, a third frame 130 and a fourth frame 140. The first frame 110 and the second frame 120 are respectively located on opposite sides of the end face of the frame body 150; the third frame 130 and the fourth frame 140 are respectively located on opposite sides of the bottom surface of the frame body 150; the first frame 110 is provided with a first pin 1, a second pin 2, a third pin 3 and a fourth pin 4; the second frame 120 is provided with a ninth pin 9, a tenth pin 10 and an eleventh pin 11; the third frame 130 is provided with a fifth pin 5 and a sixth pin 6; the third frame 130 is also provided with an extension portion 141 extending in a direction away from the frame body 150, and the extension portion 141 is provided with a seventh pin 7 and an eighth pin 8.

[0048] In some embodiments, the first frame 110, the second frame 120, the third frame 130, the fourth frame 140, and the frame body 150 are integrally formed. The first frame 110, the second frame 120, the third frame 130, and the fourth frame 140 are also used to limit the wires of each winding and to protect the wires to prevent them from becoming loose.

[0049] It is worth noting that the first frame 110 has 4 pins, while the second frame 120 has 3 pins, thus forming an asymmetrical pin structure, which can shorten the high-frequency loop and reduce parasitic inductance by 30%.

[0050] In some embodiments, refer to Figure 6 and Figure 7 One end of the first frame 110 is connected to the third frame 130 through the first connecting plate 171; the other end of the first frame 110 is connected to the third frame 130 through the second connecting plate 172, and the first connecting plate 171 and the second connecting plate 172 form a first groove.

[0051] One end of the third frame 130 is connected to the fourth frame 140 through the third connecting plate 173; the other end of the third frame 130 is connected to the fourth frame 140 through the fourth connecting plate 174, and the third connecting plate 173 and the fourth connecting plate 174 form a second groove.

[0052] In some embodiments, refer to Figure 6 and Figure 7 It also includes a magnetic core 100, which includes a first magnetic core 101 and a second magnetic core 102. The first magnetic core 101 is provided with a first recess 1011 that matches the first connecting plate 171, a second recess 1012 that matches the second connecting plate 172, and a first protrusion 1013 that matches the first slot. The first recess 1011 is engaged with the first connecting plate 171, the second recess 1012 is engaged with the second connecting plate 172, and the first protrusion 1013 is engaged with the first slot.

[0053] The second magnetic core 102 is provided with a third recess 1021 that matches the third connecting plate 173, a fourth recess 1022 that matches the fourth connecting plate 174, and a second protrusion 1023 that matches the second slot. The third recess 1021 is engaged with the third connecting plate 173, the fourth recess 1022 is engaged with the fourth connecting plate 174, and the second protrusion 1023 is engaged with the second slot.

[0054] In some embodiments, the first magnetic core 101 and the second magnetic core 102 are symmetrical.

[0055] In some embodiments, the starting point of the first main winding is connected to pin 5, and the ending point of the first main winding is connected to pin 11; the starting point of the feedback winding is connected to pin 2, and the ending point of the feedback winding is connected to pin 1; the starting point of the first shielding winding is connected to pin 1, and the ending point of the first shielding winding is connected to pin 9; the starting point of the secondary winding is connected to pin 7, and the ending point of the secondary winding is connected to pin 8; the starting point of the second shielding winding is connected to pin 1, and the ending point of the second shielding winding is connected to pin 10; the starting point of the second main winding is connected to pin 11, and the ending point of the second main winding is connected to pin 3.

[0056] In some embodiments, the first frame 110 is provided with a plurality of first wire slots 111, and the first pin 1, the second pin 2, the third pin 3 and the fourth pin 4 each correspond to one first wire slot 111; the second frame 120 is provided with a plurality of second wire slots 121, and the ninth pin 9, the tenth pin 10 and the eleventh pin 11 each correspond to one second wire slot 121. The first wire slots 111 and the second wire slots 121 facilitate the connection between the wires and the pins.

[0057] It should be noted that the distance between the outer edge of the first skeleton 110 and the skeleton body 150 is 0.5 to 0.8 mm, for example, 0.5 mm, 0.6 mm, or 0.8 mm. The distance between the outer edge of the second skeleton 120 and the skeleton body 150 is 0.5 to 0.8 mm, for example, 0.5 mm, 0.6 mm, or 0.8 mm. The distance between the outer edge of the third skeleton 130 and the skeleton body 150 is 0.5 to 0.8 mm, for example, 0.5 mm, 0.6 mm, or 0.8 mm. The distance between the outer edge of the fourth skeleton 140 and the skeleton body 150 is 0.5 to 0.8 mm, for example, 0.5 mm, 0.6 mm, or 0.8 mm. The distance between the outer edge of the extension 141 and the skeleton body 150 is 0.5 to 0.8 mm, for example, 0.5 mm, 0.6 mm, or 0.8 mm.

[0058] In some embodiments, the dimensions of the high-frequency transformer in this application are 22.3*21.8*17.8mm, while the dimensions of a traditional high-frequency transformer are generally 25*25*12mm. Therefore, the space utilization rate of the high-frequency transformer in this application can be improved by 28%. The full-load temperature rise of a traditional high-frequency transformer is 68 degrees Celsius, while the full-load temperature rise of the high-frequency transformer in this application is less than or equal to 52 degrees Celsius. Therefore, the full-load temperature rise of the high-frequency transformer in this application is reduced by 23.5%. The conducted noise of a traditional high-frequency transformer at 500kHz is -6dB, while the conducted noise of the high-frequency transformer in this application is -10dB at 500kHz. The power density of a traditional high-frequency transformer is 5W / cm^3, while the power density of the high-frequency transformer in this application is 8.2W / cm^3. Therefore, the power density of the high-frequency transformer in this application is improved by 64%.

[0059] A second aspect of this application provides a switching power supply, which includes the high-frequency transformer of the first aspect of this application.

[0060] Since the switching power supply includes the high-frequency transformer of the first aspect embodiment, the corresponding content of the high-frequency transformer in the embodiment mentioned in the first aspect is also applicable to the switching power supply in the embodiment mentioned in the second aspect, and has the same implementation principle and technical effect. To avoid redundancy, it will not be described in detail here.

[0061] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A high-frequency transformer, characterized in that, include: The frame body is provided with a first main winding, a secondary winding, a combined winding, a second shielding winding, and a second main winding. The first main winding is located between the merging winding and the skeleton body; the merging winding is located between the first main winding and the secondary winding; the secondary winding is located between the merging winding and the second shielding winding; the second shielding winding is located between the secondary winding and the second main winding; the merging winding consists of a feedback winding and a first shielding winding; the conductor diameter of the secondary winding is larger than the conductor diameter of the first main winding, the conductor diameter of the first main winding is equal to the conductor diameter of the second main winding; and the number of coils in the secondary winding is smaller than the number of coils in the first main winding.

2. The high-frequency transformer according to claim 1, characterized in that, An insulating layer is provided between the first main winding and the secondary winding; an insulating layer is provided between the secondary winding and the merging winding; an insulating layer is provided between the merging winding and the shielding winding; and an insulating layer is provided between the second shielding winding and the second main winding.

3. The high-frequency transformer according to claim 1, characterized in that, It also includes a first frame, a second frame, a third frame, and a fourth frame. The first frame and the second frame are respectively located on opposite sides of the end face of the frame body; the third frame and the fourth frame are respectively located on opposite sides of the bottom face of the frame body; the first frame has a first pin, a second pin, a third pin, and a fourth pin; the second frame has a ninth pin, a tenth pin, and an eleventh pin; the third frame has a fifth pin and a sixth pin; the third frame also has an extension portion extending away from the frame body, and the extension portion has a seventh pin and an eighth pin.

4. The high-frequency transformer according to claim 3, characterized in that, One end of the first frame is connected to the third frame via a first connecting plate; the other end of the first frame is connected to the third frame via a second connecting plate, and the first connecting plate and the second connecting plate form a first groove. One end of the third frame is connected to the fourth frame via a third connecting plate; the other end of the third frame is connected to the fourth frame via a fourth connecting plate, and the third connecting plate and the fourth connecting plate form a second groove.

5. The high-frequency transformer according to claim 4, characterized in that, It also includes a magnetic core, which includes a first magnetic core and a second magnetic core; the first magnetic core has a first recess that matches the first connecting plate, the first magnetic core has a second recess that matches the second connecting plate, and the first magnetic core has a first protrusion that matches the first slot; the first recess is engaged with the first connecting plate, the second recess is engaged with the second connecting plate, and the first protrusion is engaged with the first slot. The second magnetic core has a third recess that matches the third connecting plate, a fourth recess that matches the fourth connecting plate, and a second protrusion that matches the second slot; the third recess is engaged with the third connecting plate, the fourth recess is engaged with the fourth connecting plate, and the second protrusion is engaged with the second slot.

6. The high-frequency transformer according to claim 4, characterized in that, The starting point of the first main winding is connected to the fifth pin, and the ending point of the first main winding is connected to the eleventh pin; the starting point of the feedback winding is connected to the second pin, and the ending point of the feedback winding is connected to the first pin; the starting point of the first shielding winding is connected to the first pin, and the ending point of the first shielding winding is connected to the ninth pin; the starting point of the secondary winding is connected to the seventh pin, and the ending point of the secondary winding is connected to the eighth pin; the starting point of the second shielding winding is connected to the first pin, and the ending point of the second shielding winding is connected to the tenth pin; the starting point of the second main winding is connected to the eleventh pin, and the ending point of the second main winding is connected to the third pin.

7. The high-frequency transformer according to claim 4, characterized in that, The first frame is provided with a plurality of first wire slots, and the first pin, the second pin, the third pin and the fourth pin are respectively corresponding to a first wire slot; the second frame is provided with a plurality of second wire slots, and the ninth pin, the tenth pin and the eleventh pin are respectively corresponding to a second wire slot.

8. The high-frequency transformer according to claim 1, characterized in that, The number of coils in the first main winding is 22.5; the number of coils in the secondary winding is 4.

9. The high-frequency transformer according to claim 1, characterized in that, The number of coils in the feedback winding is 9; the number of coils in the first shielding winding is 9; the number of coils in the second shielding winding is 13; and the number of coils in the second main winding is 20.

10. A switching power supply, characterized in that, Including the high-frequency transformer as described in any one of claims 1 to 9.

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