Transformer without Y capacitor
The Y-capacitor-free transformer solves the problem of Y-cell capacitors being prone to aging and breakdown by connecting the shielding layer winding to the grounding terminal and winding them in the same layer. It achieves common-mode interference suppression and insulation strength improvement, making it suitable for the compact design of modern electronic equipment.
Patent Information
- Application Number
- CN202423249168.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-27
AI Technical Summary
In traditional transformers, the Y-current is prone to aging and breakdown, and it is difficult to meet the size and weight requirements of modern electronic equipment.
The design employs a Y-capacitor-free approach. By winding a shielding layer in the transformer and connecting it to the ground terminal, and by making the auxiliary winding wider than the shielding layer winding, an electrostatic shielding system is formed, reducing the common-mode current between the primary and secondary windings. Furthermore, the capacitive coupling is reduced through same-layer winding and insulation.
It effectively suppresses common-mode interference, avoids capacitor aging and breakdown risks, improves transformer space utilization and insulation strength, and meets the compact requirements of modern electronic equipment.
Smart Images
Figure CN223665293U_ABST
Abstract
Description
[Technical Field]
[0001] This utility model relates to the field of transformer structure technology, and in particular to a transformer without a Y capacitor. [Background Technology]
[0002] Most of the common-mode interference signals in switching power supplies originate from the transformer. High-frequency noise in the primary winding of the transformer is coupled to the secondary winding through parasitic capacitance (i.e., interlayer capacitance between transformer windings), and then coupled to the radio frequency receiver or to the conducting receiver through the input and output lines via the parasitic capacitance between the secondary winding and the ground.
[0003] In traditional transformer design, Y-capacitors (also known as Y-type capacitors or line-to-line capacitors) are often used to suppress common-mode interference and ensure the stability and safety of power transmission. However, the introduction of Y-capacitors not only increases the manufacturing cost of transformers but may also cause safety hazards due to capacitor aging and breakdown. Furthermore, with the trend of miniaturization and integration of electronic products, traditional transformers with Y-capacitors are unable to meet the extreme space utilization requirements of modern electronic devices in terms of size and weight. [Utility Model Content]
[0004] To address the technical problems of current transformers using Y capacitors, which are prone to aging and breakdown, and whose size and weight are insufficient to meet the requirements of modern electronic devices, this invention proposes a transformer without Y capacitors.
[0005] This utility model is achieved by the following technical solution:
[0006] A transformer without a Y capacitor includes a frame and a magnetic core fixed on the frame. A primary winding, an auxiliary winding, and a secondary winding are wound sequentially on the magnetic core. Before the auxiliary winding is wound, a shielding layer winding for connection to the ground terminal of the transformer is wound. The winding width of the auxiliary winding is wider than the winding width of the shielding layer winding to reduce the common-mode current between the primary winding and the secondary winding.
[0007] As described above, in a transformer without a Y capacitor, the shielding layer winding and the auxiliary winding are wound in the same layer. The shielding layer winding starts at the same end of the shielding layer winding and ends at the feedback end of the auxiliary winding. The auxiliary winding starts at the same end of the auxiliary winding and ends at the same end of the shielding layer winding.
[0008] As described above, in a transformer without a Y capacitor, both the shielding winding and the auxiliary winding are made of two wires wound in parallel with multiple turns.
[0009] As described above, in a transformer without a Y capacitor, the primary winding starts at the same-name end of the primary winding and ends at the opposite-name end of the primary winding.
[0010] As described above, in a transformer without a Y capacitor, the primary winding has multiple layers, and each layer of the primary winding is made by winding a single wire multiple times.
[0011] As described above, in a transformer without a Y capacitor, the secondary winding starts at the same-name end of the secondary winding and ends at the opposite-name end of the secondary winding, and the secondary winding is made by winding a single wire multiple times.
[0012] As described above, in a transformer without a Y capacitor, after the secondary winding is wound, both its same-named and opposite-named ends are provided with Teflon bushings for providing insulation protection.
[0013] As described above, in a transformer without a Y capacitor, an insulating layer is provided between the primary winding and the auxiliary winding, and between the auxiliary winding and the secondary winding.
[0014] As described above, in a transformer without a Y capacitor, the insulating layer is made of two layers of insulating paper.
[0015] As described above, a transformer without a Y capacitor has a core made of high-quality silicon steel sheets.
[0016] Compared with the prior art, the transformer without Y capacitor proposed in this utility model has the following beneficial effects:
[0017] 1. The shielding layer winding proposed in this utility model is connected to the grounding terminal of the transformer to form a continuous electrostatic shielding system. The winding width of the auxiliary winding is wider than that of the shielding layer winding, which reduces the coupling effect between the primary winding and the secondary winding, thereby reducing the common-mode current between the primary winding and the secondary winding. This plays the role of suppressing common-mode interference as traditional Y capacitors, avoiding the safety hazards of capacitor aging and easy breakdown caused by Y capacitors. Secondly, the absence of Y capacitors also makes the transformer space more compact, which is more suitable for the needs of modern electronic equipment.
[0018] 2. The shielding layer winding and the auxiliary winding proposed in this utility model are wound in the same layer. Since the shielding layer winding is directly adjacent to the auxiliary winding, it can more directly absorb and reduce the capacitive coupling between the primary winding and the secondary winding, thereby reducing common-mode noise.
[0019] 3. The Teflon bushing proposed in this utility model is installed on the secondary winding. Its excellent electrical insulation properties help to improve the insulation strength of the transformer and prevent electrical faults. Secondly, the Teflon bushing is resistant to high temperatures, which helps the transformer to effectively absorb and dissipate heat during operation and improve the thermal stability of the transformer. [Attached Image Description]
[0020] 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.
[0021] Figure 1 This is a schematic diagram of the winding structure of this utility model;
[0022] Figure 2 This is the electrical schematic diagram of this utility model;
[0023] Figure 3 This is a schematic diagram of the transformer structure of this utility model. Figure 1 ;
[0024] Figure 4 This is a schematic diagram of the transformer structure of this utility model. Figure 2 .
Detailed Implementation Methods
[0025] 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.
[0026] Specific embodiments, combined with Figures 1 to 4 As shown, the technical solution of this utility model is further explained. A transformer without a Y capacitor includes a frame 10 and a magnetic core 20 fixed on the frame 10. A primary winding N1, an auxiliary winding N3 and a secondary winding N4 are wound sequentially on the magnetic core 20. Before the auxiliary winding N3 is wound, a shielding layer winding N2 for connecting to the ground terminal of the transformer is wound. The winding width of the auxiliary winding N3 is wider than the winding width of the shielding layer winding N2 to reduce the common mode current between the primary winding N1 and the secondary winding N4. The shielding winding N2 of this transformer is connected to the transformer's grounding terminal, forming a continuous electrostatic shielding system. The winding width of the auxiliary winding N3 is wider than that of the shielding winding N2, which reduces the coupling effect between the primary winding N1 and the secondary winding N4. This reduces the common-mode current between the primary winding N1 and the secondary winding N4, playing the role of suppressing common-mode interference as a traditional Y capacitor. It avoids the safety hazards of capacitor aging and easy breakdown caused by Y capacitors. Secondly, the absence of Y capacitors also makes the transformer space more compact, which is more suitable for the needs of modern electronic equipment.
[0027] Furthermore, as a preferred embodiment of this solution and not a limitation, the primary winding N1 starts at the same-name end of the primary winding N1 (i.e., the third pin in this embodiment) and ends at the opposite-name end of the primary winding N1 (i.e., the first pin in this embodiment). The primary winding N1 is wound in multiple layers, and each layer of the primary winding N1 is made by winding a single wire multiple times.
[0028] In this embodiment, the primary winding N1 is wound in three layers. Each layer of the primary winding N1 is made by winding a single wire 83 times. The diameter of the wire used to wind the primary winding N1 is 0.29 mm. In specific implementation, the number of winding layers, the wire gauge, and the number of turns of the primary winding N1 can be adjusted according to actual needs.
[0029] Furthermore, as a preferred embodiment of this solution and not a limitation, the shielding layer winding and the auxiliary winding are wound in the same layer. The shielding layer winding N2 starts at the same end as the shielding layer winding N2 (i.e., pin 2 in this embodiment) and ends at the feedback end of the auxiliary winding N3 (i.e., pin 4 in this embodiment). The auxiliary winding N3 starts at the same end as the auxiliary winding N3 (i.e., pin 5 in this embodiment) and ends at the same end as the shielding layer winding N2 (i.e., pin 2 in this embodiment).
[0030] In this embodiment, the shielding layer winding N2 and the auxiliary winding N3, which are wound in the same layer, can more effectively shield the electromagnetic interference between the primary winding N1 and the secondary winding N4. Since the shielding layer winding N2 is directly adjacent to the auxiliary winding N3, it can more directly absorb and reduce the capacitive coupling between the primary winding N1 and the secondary winding N4, thereby reducing common-mode noise.
[0031] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, both the shielding layer winding N2 and the auxiliary winding N3 are made by winding multiple turns of two wires in parallel.
[0032] In this embodiment, the shielding layer winding N2 is made by winding three turns of double wire in parallel, and the auxiliary winding N3 is made by winding nine turns of double wire in parallel. The diameter of the wires used to wind the shielding layer winding N2 and the auxiliary winding N3 is 0.15mm. In specific implementation, the wire gauge and the number of turns used to wind the shielding layer winding N2 and the auxiliary winding N3 can be adjusted according to actual needs.
[0033] Furthermore, as a preferred embodiment of this solution and not a limitation, the secondary winding N4 starts at the same-name end of the secondary winding N4 (i.e., pin 6 in this embodiment) and ends at the opposite-name end of the secondary winding N4 (i.e., pin 7 in this embodiment), and the secondary winding N4 is made by winding a single wire multiple times.
[0034] In this embodiment, the secondary winding N4 is made by winding a single wire 8 times. The diameter of the wire used to wind the secondary winding N4 is 0.65 mm. In actual implementation, the wire gauge and the number of turns of the wire used to wind the secondary winding N4 can be adjusted according to actual needs.
[0035] Furthermore, as a preferred embodiment of this solution and not a limitation, after the secondary winding N4 is wound, both its same-named and different-named ends are provided with Teflon sleeves 30 for providing insulation protection.
[0036] In this embodiment, since the secondary winding is the part of the transformer that is directly connected to the load, it is particularly important to protect it with insulation. Teflon bushings have excellent electrical insulation properties, and their placement on the secondary winding helps to improve the insulation strength of the transformer and prevent electrical faults. Secondly, Teflon bushings are resistant to high temperatures, which helps the transformer to effectively absorb and dissipate heat during operation, thereby improving the thermal stability of the transformer.
[0037] Furthermore, as a preferred embodiment of this solution and not a limitation, an insulating layer 40 is provided between the primary winding N1 and the auxiliary winding N3, and between the auxiliary winding N3 and the secondary winding. The insulating layer 40 is made of two layers of insulating adhesive paper.
[0038] In this embodiment, the insulation layer can reduce electromagnetic interference between windings, improve the electromagnetic compatibility of the transformer, reduce heat conduction between thermal resistances, 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.
[0039] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the windings of the primary winding N1, the shielding layer winding N2, the auxiliary winding N3, and the secondary winding N4 must be kept flat and precise.
[0040] In this embodiment, ensuring that the windings of each winding are flat and precise can reduce electromagnetic interference between windings, improve the electromagnetic compatibility of the transformer, and also help to distribute and dissipate heat evenly, thereby improving the thermal stability of the transformer.
[0041] Furthermore, as a preferred embodiment of this solution and not a limitation, the conductors used for winding the primary winding N1, the shielding layer winding N2, the auxiliary winding N3, and the secondary winding N4 are all enameled copper wires. In specific implementations, other wires may also be used.
[0042] Furthermore, as a preferred embodiment of this solution and not a limitation, the magnetic core 20 is made of high-quality silicon steel sheet.
[0043] The working principle of this embodiment is as follows:
[0044] This utility model proposes a transformer without a Y capacitor. By winding a shielding layer winding N2 connected to the transformer's grounding terminal before winding the auxiliary winding N3, and by ensuring the winding width of the auxiliary winding N3 is wider than that of the shielding layer winding N2, the transformer replaces the function of a traditional Y capacitor. The specific principle is as follows:
[0045] When winding the shielding layer winding N2, the starting point is at the same-name end of the shielding layer winding N2, and the ending point is at the feedback end of the auxiliary winding N3. After the shielding layer winding N2 is completed, the auxiliary winding N3 is wound. The starting point of the auxiliary winding N3 is at the same-name end of the auxiliary winding N3, and the ending point is at the same-name end of the shielding layer winding N2. The auxiliary winding N3 and the shielding layer winding N2 are wound in the same layer, so that the shielding layer winding N2 is directly adjacent to the auxiliary winding N3. This can more directly absorb and reduce the capacitive coupling between the primary winding N1 and the secondary winding N4, thereby reducing common-mode noise.
[0046] In addition, the number of turns of the shielding layer winding N2 is less than the number of turns of the auxiliary winding N3, so that the winding width of the auxiliary winding N3 is wider than the winding width of the shielding layer winding. This can reduce the coupling effect between the primary winding N1 and the secondary winding N4, thereby reducing the common-mode current between the primary winding N1 and the secondary winding N4.
[0047] 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 transformer without a Y capacitor, characterized in that, It includes a frame (10) and a magnetic core (20) fixed on the frame (10). A primary winding, an auxiliary winding and a secondary winding are wound sequentially on the magnetic core (20). Before the auxiliary winding is wound, a shielding layer winding for connection with the grounding terminal of the transformer is wound. The winding width of the auxiliary winding is wider than the winding width of the shielding layer winding to reduce the common mode current between the primary winding and the secondary winding.
2. A transformer without a Y capacitor according to claim 1, characterized in that, The shielding layer winding and the auxiliary winding are wound in the same layer. The shielding layer winding starts at the same end of the shielding layer winding and ends at the feedback end of the auxiliary winding. The auxiliary winding starts at the same end of the auxiliary winding and ends at the same end of the shielding layer winding.
3. A transformer without a Y capacitor according to claim 1, characterized in that, Both the shielding layer winding and the auxiliary winding are made by winding multiple turns of two wires in parallel.
4. A transformer without a Y capacitor according to claim 1, characterized in that, The primary winding starts at the same-name end of the primary winding and ends at the opposite-name end of the primary winding.
5. A transformer without a Y capacitor according to claim 4, characterized in that, The primary winding has multiple layers, and each layer of the primary winding is made by winding a single wire multiple times.
6. A transformer without a Y capacitor according to claim 1, characterized in that, The secondary winding starts at the same-name end of the secondary winding and ends at the opposite-name end of the secondary winding. The secondary winding is made by winding a single wire multiple times.
7. A transformer without a Y capacitor according to claim 6, characterized in that, After the secondary winding is wound, both its same-named and different-named ends are provided with Teflon sleeves (30) for providing insulation protection.
8. A transformer without a Y capacitor according to claim 1, characterized in that, An insulating layer (40) is provided between the primary winding and the auxiliary winding, and between the auxiliary winding and the secondary winding.
9. A transformer without a Y capacitor according to claim 8, characterized in that, The insulating layer (40) is made of two layers of insulating adhesive paper.
10. A transformer without a Y capacitor according to claim 1, characterized in that, The magnetic core (20) is made of high-quality silicon steel sheet.