Common-mode noise reduction structure of power transformer
By using symmetrical transformer cores and coils in small-volume and high-power power products, and using composite polyester rubber non-woven tape between the columns in the core, the problems of magnetic field resonance interference and EMI electromagnetic radiation are solved, and more efficient electromagnetic compatibility and smaller product sizes are achieved.
Patent Information
- Application Number
- CN202421851474.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-01
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-08-01
AI Technical Summary
In small-volume and high-power power products, the magnetic field resonance interference of magnetic components has a great impact, resulting in high requirements for product structure size, space and working efficiency, and it is difficult to effectively reduce EMI electromagnetic radiation interference.
Two symmetrically arranged transformer cores and transformer coils are used, and composite polyester rubber non-woven tape is set between the columns in the core, and the transformer coil is connected to the AC input power supply shielded by copper foil to absorb vibration and reduce noise.
Effectively buffer and absorb vibrations generated by current from the columns in the transformer core, reduce EMI electromagnetic radiation interference, reduce PCB size and reduce product development costs.
Smart Images
Figure CN222952918U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a power transformer, in particular to a common-mode noise reduction structure of a power transformer. Background Art
[0002] As the technology of current consumer electronic products changes with each passing day, the idea of green environmental protection and energy saving has gradually taken root in people's hearts. Energy efficiency has become the focus of attention in product design. The market demand for small-volume, high-power power supplies and low-energy consumption products is very large. At present, small-volume, high-power power supplies have very high requirements on product structure size, space and work efficiency, so the layout of product components is very compact, which leads to a relatively large impact of magnetic field resonance interference of similar magnetic components. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide a common-mode noise reduction structure of a power transformer to solve the problems existing in the background technology.
[0004] The common-mode noise reduction structure of the power transformer of the utility model is realized by the following technical scheme, including two symmetrically arranged transformer cores and transformer coils;
[0005] The two symmetrically arranged transformer cores are spliced with each other, and the transformer coil is placed on the core center column of the transformer core;
[0006] A composite polyester rubber type non-woven fabric tape is arranged between the core middle columns of two symmetrically arranged transformer cores.
[0007] As a preferred technical solution, positioning grooves are provided above and below the transformer core, and positioning blocks corresponding to the positioning grooves are provided on the transformer coil. The transformer coil is positioned on the transformer core through the positioning blocks and the positioning grooves to prevent it from rotating.
[0008] As a preferred technical solution, an air gap is provided between the core center columns of two symmetrically arranged transformer cores, and the composite polyester rubber type non-woven fabric tape is placed in the air gap.
[0009] As a preferred technical solution, the transformer coil is connected to an AC input power supply through a copper foil shield.
[0010] The beneficial effects of the utility model are:
[0011] The utility model uses a composite polyester rubber non-woven tape at the air gap position of the middle column of the power transformer core, which can buffer and absorb the vibration and reduce noise caused by the current passing through the middle column of the transformer core, so that the magnetic device in the power cavity can be free from interference from adjacent components, correspondingly reducing the size occupied by the PCB and reducing the product development cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0013] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;
[0014] Figure 2 It is a schematic diagram of the explosion structure of the utility model;
[0015] Figure 3 This is a schematic diagram of the air gap position of the transformer core of the utility model.
[0016] Description of reference numerals:
[0017] 1. Transformer core; 2. Transformer coil; 3. Core center column; 4. Composite polyester rubber non-woven tape; 5. Air gap; 6. Positioning groove; 7. Positioning block. DETAILED DESCRIPTION
[0018] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.
[0019] like Figure 1 and Figure 2 As shown, a common-mode noise reduction structure of a power transformer of the utility model comprises two symmetrically arranged transformer cores 1 and a transformer coil 2;
[0020] The two symmetrically arranged transformer cores 1 are spliced with each other, and the transformer coil 2 is placed on the core center column 3 of the transformer core 1;
[0021] A composite polyester rubber type non-woven fabric tape 4 is arranged between the core middle columns 3 of two symmetrically arranged transformer cores 1 .
[0022] Among them, positioning grooves 6 are provided above and below the transformer core 1, and positioning blocks 7 corresponding to the positioning grooves 6 are provided on the transformer coil 2. The transformer coil 2 is positioned on the transformer core 1 through the positioning blocks 7 and the positioning grooves 6 to prevent it from rotating.
[0023] like Figure 3 As shown, an air gap 5 is provided between the core middle columns 3 of two symmetrically arranged transformer cores 1 , and a composite polyester rubber type non-woven fabric tape 4 is placed at the air gap 5 .
[0024] Furthermore, the transformer coil 2 is connected to an AC input power source through a copper foil shield.
[0025] The utility model is suitable for small-volume and high-power power supply products. A composite polyester rubber non-woven tape is attached to the air gap position of the transformer core center column, so that the resonance generated by the current when the transformer is powered on can effectively absorb the vibration wave, so that the primary coil of the AC input power transformer after copper foil shielding can generate common mode current to the transformer coil to affect EMI electromagnetic radiation interference.
[0026] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope defined in the claims.
Claims
1. A common mode noise reduction structure for a power transformer, characterized in that: It comprises two symmetrically arranged transformer magnetic cores (1) and a transformer coil (2); The two symmetrically arranged transformer cores (1) are spliced together, and the transformer coil (2) is placed on the core center column (3) of the transformer core (1); A composite polyester rubber type non-woven fabric tape (4) is arranged between the magnetic core center columns (3) of two symmetrically arranged transformer magnetic cores (1).
2. The power transformer common mode noise reduction structure according to claim 1, characterized in that: Positioning grooves (6) are provided above and below the transformer core (1); a positioning block (7) corresponding to the positioning groove (6) is provided on the transformer coil (2); the transformer coil (2) is positioned on the transformer core (1) by means of the positioning block (7) and the positioning groove (6) to prevent the transformer coil (2) from rotating.
3. The power transformer common mode noise reduction structure according to claim 1, characterized in that: An air gap (5) is provided between the magnetic core center columns (3) of two symmetrically arranged transformer magnetic cores (1), and a composite polyester rubber type non-woven fabric tape (4) is placed at the air gap (5).
4. The power transformer common mode noise reduction structure according to claim 1, characterized in that: The transformer coil (2) is connected to an AC input power source through a copper foil shield.