A multi-winding transformer

Abstract

The application discloses a multi-winding transformer, which comprises a framework and a magnetic core body fixed on the framework, and a first primary winding N1, a first secondary winding N2, a second secondary winding N3, a second primary winding N4 and a shielding layer winding N5 are sequentially and layer by layer wound on the framework; when the second primary winding N4 is wound, the second primary winding N4 is wound on the take-up end of the first primary winding N1, and the start end and the take-up end of the first primary winding N1 and the start end of the second primary winding N4 are all sleeved with an insulating sleeve for providing insulation protection. The primary winding is wound in a layered manner, and the secondary winding is wrapped, so that the magnetic resistance between the primary winding and the secondary winding is reduced through the structure of being tightly wrapped, the coupling interference caused by the distributed capacitance and the leakage inductance is reduced, the coupling coefficient between the primary winding and the secondary winding is improved, and the electromagnetic compatibility of the transformer is improved.

Description

[Technical Field]

[0002] This utility model relates to the field of transformer technology, and in particular to a multi-winding transformer. [Background Technology]

[0004] In the field of electronics, transformers, as key electrical components, are widely used in various circuits to achieve functions such as voltage transformation, electrical isolation, and energy transmission. Multi-winding transformers typically consist of a primary winding and multiple secondary windings, each capable of providing a different voltage output. When current flows through the primary winding, a magnetic field is generated in the iron core. This magnetic field then induces an electromotive force in the secondary windings, thereby producing different output voltages.

[0005] In the existing multi-winding transformers, the primary and secondary windings are mostly wound in a single layer, independently wound on the frame. This winding method tends to form a large distributed capacitance between the primary and secondary windings, resulting in loose magnetic coupling between the primary and secondary windings. This reduces the transformer's coupling coefficient and electromagnetic compatibility, making it difficult to meet the requirements of modern electronic equipment for high-performance transformers. [Utility Model Content]

[0007] To address the technical problem that current multi-winding transformers often exhibit large distributed capacitance in their primary and secondary windings, leading to loose magnetic coupling between the primary and secondary windings, this invention provides a multi-winding transformer.

[0008] To achieve the above objectives, this utility model is implemented by the following technical solution:

[0009] A multi-winding transformer includes a frame and a magnetic core body fixed on the frame. A first primary winding N1, a first secondary winding N2, a second secondary winding N3, a second primary winding N4, and a shielding layer winding N5 are sequentially wound on the frame. When winding the second primary winding N4, the second primary winding N4 is wound at the winding end of the first primary winding N1. The starting and winding ends of the first primary winding N1 and the starting end of the second primary winding N4 are all fitted with insulating sleeves for providing insulation protection.

[0010] By adopting the above technical solution, the primary winding is wound in layers to wrap the secondary winding. The tightly wrapped structure reduces the magnetic resistance between the primary and secondary windings, which helps to reduce coupling interference caused by distributed capacitance and leakage inductance, and improves the coupling coefficient between the primary and secondary windings, thereby improving the electromagnetic compatibility of the transformer. Secondly, both the primary and secondary windings are wound in layers. Compared with the single-layer winding method, the layered structure makes the magnetic flux distribution more uniform, thereby effectively reducing leakage inductance and improving the coupling coefficient of the transformer.

[0011] As described above, in a multi-winding transformer, when winding the first primary winding N1, the same-name end of the first primary winding N1 is used as the starting end, and the same-name end of the second primary winding N4 is used as the ending end. The first primary winding N1 is wound in multiple layers, and each layer of the first primary winding N1 is made by two wires wound multiple turns.

[0012] As described above, in the winding of the first primary winding N2, the same-name end of the first primary winding N2 is used as the starting end, and the opposite-name end of the first primary winding N2 is used as the ending end. The first primary winding N2 is wound in multiple layers, and each layer of the first primary winding N2 is made by two wires wound multiple turns.

[0013] As described above, in the winding of the second-stage winding N3, the same-name end of the second-stage winding N3 is used as the starting end, and the opposite-name end of the second-stage winding N3 is used as the ending end. The second-stage winding N3 is wound in multiple layers, and each layer of the second-stage winding N3 is made by two wires wound multiple turns.

[0014] As described above, in a multi-winding transformer, when winding the second primary winding N4, the opposite-named end of the second primary winding N4 is used as the starting end, and the same-named end of the second primary winding N4 is used as the ending end. The second primary winding N4 is wound in multiple layers, and each layer of the second primary winding N4 is made by two wires wound multiple turns.

[0015] As described above, in the winding of the shielding layer winding N5, the same-name end of the shielding layer winding N5 is used as the starting end, and the opposite-name end of the shielding layer winding N5 is used as the ending end. The shielding layer winding N5 is made by winding a single conductor in the center with multiple turns.

[0016] An insulating layer is provided between the first primary winding N1 and the first primary winding N2, between the first primary winding N2 and the second primary winding N3, between the second primary winding N3 and the second primary winding N4, between the second primary winding N4 and the shielding layer winding N5, and on the outside of the shielding layer winding N5.

[0017] In the multi-winding transformer described above, the insulation layer between the primary winding N2 and the secondary winding N3, and between the secondary winding N3 and the second primary winding N4, is made of three layers of insulating tape.

[0018] As described above, in a multi-winding transformer, the insulating layer between the first primary winding N1 and the first primary winding N2, between the second primary winding N4 and the shielding layer winding N5, and on the outside of the shielding layer winding N5, is made of two layers of insulating tape.

[0019] In the multi-winding transformer described above, the insulating bushing is a Teflon bushing.

[0020] Compared with the prior art, the multi-winding transformer proposed in this utility model has the following beneficial effects:

[0021] 1. The multi-winding transformer proposed in this utility model uses a layered winding method for the primary winding to wrap the secondary winding. This tightly wrapped structure reduces the magnetic resistance between the primary and secondary windings, which helps to reduce coupling interference caused by distributed capacitance and leakage inductance, and improves the coupling coefficient between the primary and secondary windings, thereby improving the electromagnetic compatibility of the transformer. Secondly, both the primary and secondary windings are wound in layers. Compared with single-layer winding, the layered structure makes the magnetic flux distribution more uniform, thereby effectively reducing leakage inductance and improving the coupling coefficient of the transformer.

[0022] 2. The first and second primary windings proposed in this utility model have insulating sleeves at their starting and ending ends, which can effectively prevent the conductors at the beginning and end of the primary winding from contacting the frame or magnetic core body and causing short circuits. In addition, the insulating sleeves, together with the layered structure design of the primary winding, help to form an insulation barrier between the windings, reduce the possibility of arc discharge between the windings, and improve the insulation reliability of the transformer under high voltage environment. [Attached Image Description]

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0025] Figure 1 This is a schematic diagram of the winding structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the electrical polarity of this utility model;

[0027] Figure 3 This is a front view of the product structure of this utility model;

[0028] Figure 4 This is a side view of the product structure of this utility model;

[0029] Figure 5 This is a bottom view of the product structure of this utility model.

Detailed Implementation Methods

[0031] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0032] Specific embodiments, combined with Figures 1 to 5 As shown, the technical solution of this utility model is further explained. A multi-winding transformer includes a frame 10 and a magnetic core body 20 fixed on the frame 10. A first primary winding N1, a first secondary winding N2, a second secondary winding N3, a second primary winding N4, and a shielding layer winding N5 are sequentially wound on the frame 10. When winding the second primary winding N4, the second primary winding N4 is wound at the winding end of the first primary winding N1. The starting and winding ends of the first primary winding N1 and the starting end of the second primary winding N4 are all fitted with insulating sleeves 30 for providing insulation protection.

[0033] The insulating sleeve 30 may include, but is not limited to, a Teflon sleeve or an insulating fiber sleeve. Preferably, the insulating sleeve 30 is a Teflon sleeve.

[0034] In this embodiment, the primary winding is wound in layers to wrap the secondary winding. This tightly wrapped structure reduces the magnetic resistance between the primary and secondary windings, which helps to reduce coupling interference caused by distributed capacitance and leakage inductance, and improves the coupling coefficient between the primary and secondary windings, thereby improving the electromagnetic compatibility of the transformer. Secondly, both the primary and secondary windings are wound in layers. Compared with single-layer winding, the layered structure makes the magnetic flux distribution more uniform, thereby effectively reducing leakage inductance and improving the coupling coefficient of the transformer.

[0035] In addition, both the starting and ending ends of the primary winding are equipped with insulating sleeves, which can effectively prevent the conductors at the beginning and end of the primary winding from contacting the frame or core body and causing short circuits. Furthermore, the insulating sleeves, together with the layered structure design of the primary winding, help to form an insulation barrier between the windings, reduce the possibility of arc discharge between the windings, and improve the insulation reliability of the transformer under high voltage conditions.

[0036] Furthermore, as a preferred embodiment of this solution and not a limitation, when winding the first primary winding N1, the same-name end of the first primary winding N1 (i.e., the third pin in this embodiment) is used as the starting end, and the same-name end of the second primary winding N4 (i.e., the fourth pin in this embodiment) is used as the ending end. The first primary winding N1 is wound in multiple layers, and each layer of the first primary winding N1 is made by two wires wound in multiple turns.

[0037] In a preferred embodiment, the first primary winding N1 is wound in two layers. Each layer of the first primary winding N1 is made of two wires wound 15 turns. The wires used to wind the first primary winding N1 are enameled copper wires with a diameter of 0.55mm.

[0038] Furthermore, as a preferred embodiment of this solution and not a limitation, when winding the first primary winding N2, the same-name end of the first primary winding N2 (i.e., pin 8 in this embodiment) is used as the starting end, and the opposite-name end of the first primary winding N2 (i.e., pin 11 in this embodiment) is used as the ending end. The first primary winding N2 is wound in multiple layers, and each layer of the first primary winding N2 is made of two wires wound multiple times.

[0039] In a preferred embodiment, the primary winding N2 is wound in two layers. Each layer of the primary winding N2 is made of two wires wound 6 turns. The wires used to wind the primary winding N2 are stranded wires with diameters of 0.1*75 strands.

[0040] Furthermore, as a preferred embodiment of this solution and not a limitation, when winding the second-stage winding N3, the same-name end of the second-stage winding N3 (i.e., pin 9 in this embodiment) is used as the starting end, and the opposite-name end of the second-stage winding N3 (i.e., pin 10 in this embodiment) is used as the ending end. The second-stage winding N3 is wound in multiple layers, and each layer of the second-stage winding N3 is made by two wires wound multiple times.

[0041] In a preferred embodiment, the secondary winding N3 is wound in two layers. Each layer of the secondary winding N3 is made of two wires wound 6 turns. The wires used to wind the secondary winding N3 are stranded wires with a diameter of 0.1*75 strands.

[0042] In this embodiment, the primary winding and the secondary winding are two independent parts that can simultaneously supply power to multiple loads. Since the primary and secondary windings have the same winding method and number of turns, their electrical performance is consistent. In a multi-output circuit, this ensures a stable and consistent power supply to different loads, guaranteeing circuit balance and reliability. Furthermore, the primary and secondary windings, with their identical winding method and number of turns, generate symmetrically distributed magnetic fields in the core, which can superimpose and cancel each other out. This results in a more uniform magnetic field distribution in the core. Due to the symmetry of the magnetic field distribution, the electromagnetic interference generated by the two windings cancels each other out, thereby reducing electromagnetic interference from the transformer to external circuits or equipment, improving the transformer's anti-interference capability and the circuit's electromagnetic compatibility.

[0043] Furthermore, as a preferred embodiment of this solution and not a limitation, when winding the second primary winding N4, the opposite-named end of the second primary winding N4 (i.e., the 6th pin in this embodiment) is used as the starting end, and the same-named end of the second primary winding N4 (i.e., the 4th pin in this embodiment) is used as the ending end. The second primary winding N4 is wound in multiple layers, and each layer of the second primary winding N4 is made of two wires wound in multiple turns.

[0044] In a preferred embodiment, the second primary winding N4 is wound in two layers. Each layer of the second primary winding N4 is made of two wires wound 8 turns. The wires used to wind the second primary winding N4 are enameled copper wires with a diameter of 0.55mm.

[0045] In this embodiment, the first primary winding and the second primary winding have different numbers of turns, which can achieve different voltage transformation ratios. This allows for flexible design of the transformer's output voltage to meet different circuit requirements. In addition, the primary windings with different numbers of turns enable the transformer to adapt to different input and output requirements, thereby providing more diverse circuit configurations and enhancing the transformer's versatility and flexibility in various circuit applications.

[0046] Furthermore, as a preferred embodiment of this solution and not a limitation, when winding the shielding layer winding N5, the same-name end of the shielding layer winding N5 (i.e., the first pin in this embodiment) is used as the starting end, and the opposite-name end of the shielding layer winding N5 (i.e., the second pin in this embodiment) is used as the ending end. The shielding layer winding N5 is made by winding a single wire in the center with multiple turns.

[0047] In a preferred embodiment, the shielding layer winding N5 is made by winding a single wire tightly around the center twice, and the wire used to wind the shielding layer winding N5 is an insulated wire with a diameter of 0.25mm.

[0048] In this embodiment, the shielding layer winding, as the outermost layer, can prevent the electromagnetic field inside the transformer from radiating to the outside, reducing electromagnetic interference to surrounding electronic components and equipment. At the same time, it can also prevent external electromagnetic interference from interfering with the inside of the transformer, thereby improving the electromagnetic compatibility of the transformer. In addition, the shielding layer winding can reduce magnetic flux leakage and reduce leakage inductance, thereby helping to improve the coupling coefficient of the transformer and enhance the electromagnetic coupling between the primary winding and the secondary winding.

[0049] Furthermore, as a preferred embodiment of this solution and not a limitation, an insulating layer 40 is provided between the first primary winding N1 and the first primary winding N2, between the first primary winding N2 and the second primary winding N3, between the second primary winding N3 and the second primary winding N4, between the second primary winding N4 and the shielding layer winding N5, and on the outer side of the shielding layer winding N5.

[0050] The insulating layer 40 between the first primary winding N2 and the second primary winding N3, and between the second primary winding N3 and the second primary winding N4, is made of three layers of insulating tape; the insulating layer (40) between the first primary winding N1 and the first primary winding N2, between the second primary winding N4 and the shielding winding N5, and on the outside of the shielding winding N5, is made of two layers of insulating tape.

[0051] In this embodiment, the insulation layer can reduce electromagnetic interference between windings, improve the electromagnetic compatibility of the transformer, reduce heat conduction between windings, reduce the risk of local overheating, improve the thermal stability of the transformer and extend its service life. In addition, the insulation layer increases the spacing between windings, thereby reducing the coupling effect between windings and reducing the common-mode current between windings.

[0052] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the skeleton 10 is model EQ4020 and the magnetic core body 20 is model EQ4020 PC44.

[0053] The working principle of this utility model is as follows:

[0054] This invention proposes a multi-winding transformer that uses a layered winding method for the primary winding to reduce the magnetic resistance between the primary and secondary windings, thereby reducing coupling interference caused by distributed capacitance and leakage inductance and improving the electromagnetic compatibility of the transformer.

[0055] The specific winding sequence of the transformer is as follows: First, wind the first primary winding N1, starting with the same-name end of the first primary winding N1 and ending with the same-name end of the first primary winding N4. After winding, immediately wind the first secondary winding N2, starting with the same-name end of the first primary winding N2 and ending with the opposite-name end of the first primary winding N2. After winding, immediately wind the second secondary winding N3, starting with the same-name end of the first primary winding N2 and ending with the opposite-name end of the first primary winding N3. The same-name end of winding N3 is the starting end, and the opposite-name end of the second primary winding N3 is the ending end. After winding, the second primary winding N4 is wound immediately. During winding, the opposite-name end of the second primary winding N4 is the starting end, and the same-name end of the second primary winding N4 is the ending end. After winding, the shielding layer winding N5 is wound immediately. During winding, the same-name end of the shielding layer winding N5 is the starting end, and the opposite-name end of the shielding layer winding N5 is the ending end. Through this winding method, the secondary winding can be wrapped inside the primary winding, forming a tightly wrapped structure, thereby reducing the magnetic resistance between the primary and secondary windings, which helps to reduce coupling interference caused by distributed capacitance and leakage inductance, and improves the electromagnetic compatibility of the transformer.

[0056] Those skilled in the art should understand that the above description is one embodiment provided in conjunction with specific content, and does not imply that the specific implementation of this utility model is limited to these descriptions. Furthermore, due to differences in industry naming conventions, it is not limited to the above names or English names. Any methods or structures similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the scope of protection of this utility model.

Claims

1. A multi-winding transformer, comprising a frame (10) and a magnetic core body (20) fixed on the frame (10), characterized in that, The skeleton (10) is sequentially wound with a first primary winding N1, a first secondary winding N2, a second secondary winding N3, a second primary winding N4, and a shielding layer winding N5. When the second primary winding N4 is wound, the second primary winding N4 is wound at the winding end of the first primary winding N1. The starting and winding ends of the first primary winding N1 and the starting end of the second primary winding N4 are all fitted with insulating sleeves (30) for providing insulation protection.

2. A multi-winding transformer according to claim 1, characterized in that, When winding the first primary winding N1, the same-name end of the first primary winding N1 is used as the starting end, and the same-name end of the second primary winding N4 is used as the ending end. The first primary winding N1 is wound in multiple layers, and each layer of the first primary winding N1 is made by two wires wound multiple times.

3. A multi-winding transformer according to claim 1, characterized in that, When winding the first primary winding N2, the same-name end of the first primary winding N2 is the starting end, and the opposite-name end of the first primary winding N2 is the ending end. The first primary winding N2 is wound in multiple layers, and each layer of the first primary winding N2 is made by two wires wound multiple times.

4. A multi-winding transformer according to claim 1, characterized in that, When winding the second-stage winding N3, the same-name end of the second-stage winding N3 is the starting end, and the opposite-name end of the second-stage winding N3 is the ending end. The second-stage winding N3 is wound in multiple layers, and each layer of the second-stage winding N3 is made by two wires wound multiple times.

5. A multi-winding transformer according to claim 1, characterized in that, When winding the second primary winding N4, the opposite end of the second primary winding N4 is the starting end, and the same end of the second primary winding N4 is the ending end. The second primary winding N4 is wound in multiple layers, and each layer of the second primary winding N4 is made by two wires wound multiple times.

6. A multi-winding transformer according to claim 1, characterized in that, When winding the shielding layer winding N5, the same-name end of the shielding layer winding N5 is the starting end, and the opposite-name end of the shielding layer winding N5 is the ending end. The shielding layer winding N5 is made by winding a single wire in the center and making multiple turns.

7. A multi-winding transformer according to claim 1, characterized in that, An insulating layer (40) is provided between the first primary winding N1 and the first primary winding N2, between the first primary winding N2 and the second primary winding N3, between the second primary winding N3 and the second primary winding N4, between the second primary winding N4 and the shielding layer winding N5, and on the outside of the shielding layer winding N5.

8. A multi-winding transformer according to claim 7, characterized in that, The insulation layer (40) between the primary winding N2 and the secondary winding N3, and between the secondary winding N3 and the second primary winding N4, is made of three layers of insulating tape.

9. A multi-winding transformer according to claim 7, characterized in that, The insulating layer (40) provided between the first primary winding N1 and the first primary winding N2, between the second primary winding N4 and the shielding layer winding N5, and on the outside of the shielding layer winding N5 is made of two layers of insulating tape.

10. A multi-winding transformer according to claim 1, characterized in that, The insulating sleeve (30) is a Teflon sleeve.

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