CN215988401U - Switch power supply transformer - Google Patents
Switch power supply transformer Download PDFInfo
- Publication number
- CN215988401U CN215988401U CN202121572690.XU CN202121572690U CN215988401U CN 215988401 U CN215988401 U CN 215988401U CN 202121572690 U CN202121572690 U CN 202121572690U CN 215988401 U CN215988401 U CN 215988401U
- Authority
- CN
- China
- Prior art keywords
- winding
- auxiliary
- power supply
- shielding
- switching power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004804 winding Methods 0.000 claims abstract description 112
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000003068 static effect Effects 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 abstract description 7
- 239000002390 adhesive tape Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 101150045320 AZS22-16 gene Proteins 0.000 description 1
- 101100190527 Arabidopsis thaliana PIN5 gene Proteins 0.000 description 1
- 101100190529 Arabidopsis thaliana PIN7 gene Proteins 0.000 description 1
- 101100520142 Caenorhabditis elegans pin-2 gene Proteins 0.000 description 1
- 101150032536 FL1 gene Proteins 0.000 description 1
- 102000005591 NIMA-Interacting Peptidylprolyl Isomerase Human genes 0.000 description 1
- 108010059419 NIMA-Interacting Peptidylprolyl Isomerase Proteins 0.000 description 1
- 101100066750 Nicotiana tabacum FL2 gene Proteins 0.000 description 1
- 101150011456 PIN8 gene Proteins 0.000 description 1
- 102000007315 Telomeric Repeat Binding Protein 1 Human genes 0.000 description 1
- 108010033711 Telomeric Repeat Binding Protein 1 Proteins 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 101150037009 pin1 gene Proteins 0.000 description 1
Images
Landscapes
- Coils Of Transformers For General Uses (AREA)
Abstract
The utility model discloses a switching power supply transformer, which comprises a primary winding, a secondary winding and an auxiliary winding, wherein the primary winding and the secondary winding adopt a sequential winding method, the directions of the homonymous ends of the primary winding and the secondary winding are opposite, the homonymous ends of the primary winding and the auxiliary winding are adjacently arranged, and the heteronymous ends of the primary winding and the auxiliary winding are far away; the shielding winding is arranged between the secondary winding and the auxiliary winding in a three-wire parallel connection mode, the homonymous end of the shielding winding is connected with the heteronymous end of the auxiliary winding, and the shielding winding and the auxiliary winding are arranged on the same layer. The switching power supply transformer can simplify the overall structure of the switching power supply, avoid the use of a common-mode inductor and a Y capacitor and reduce the circuit cost.
Description
Technical Field
The utility model belongs to the technical field of transformers, and particularly relates to a switching power supply transformer circuit structure capable of solving electromagnetic compatibility.
Background
In the current small-power switching power supply, a main power device is basically adopted to work in a switching state. The transformer adopts an isolation design, and is required to be provided with an input winding (a primary winding), an output winding (a secondary winding) and an auxiliary winding, wherein all the windings work at 30-150 kHz. Each winding induces dv/dt which changes rapidly, and because of different voltages and distributed capacitance, high-frequency common-mode current exists between the windings, and the current passes through the distribution between the secondary ground and the ground to form common-mode interference, thereby generating electromagnetic compatibility.
In order to solve the problem of electromagnetic compatibility generated by a switching power supply transformer, a common-mode inductor is added at an input end of a switching power supply, and a Y capacitor is added at the input end and the output end of a power supply transformer to filter a common-mode current.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a switching power supply transformer which can simplify the overall structure of a switching power supply, avoid the use of a common-mode inductor and a Y capacitor and reduce the circuit cost.
In order to achieve the above purpose, the solution of the utility model is:
a switching power supply transformer comprises a primary winding, a secondary winding and an auxiliary winding, wherein the primary winding and the secondary winding are sequentially wound, the directions of homonymous ends of the primary winding and the secondary winding are opposite, the homonymous ends of the primary winding and the auxiliary winding are adjacently arranged, and the heteronymous ends of the primary winding and the auxiliary winding are far away; the shielding winding is arranged between the secondary winding and the auxiliary winding in a three-wire parallel connection mode, the homonymous end of the shielding winding is connected with the heteronymous end of the auxiliary winding, and the shielding winding and the auxiliary winding are arranged on the same layer.
The shielding winding and the auxiliary winding adopt a winding method of three wires and one more wire in parallel connection, and the winding hanging legs adopt a method of approaching static points.
The magnetic core of the transformer is grounded through a wire.
After the scheme is adopted, the shielding winding N3 is added to shield the secondary winding N2 and the auxiliary winding N4, so that the common-mode current of the transformer is effectively reduced, the design requirements of electromagnetic compatible parts are reduced, particularly the inductance value of the common-mode inductor and the capacitance value of the Y capacitor are reduced, and the cost and the volume of the common-mode inductor and the Y capacitor are reduced; meanwhile, the Y capacitor can be removed in an optimized state, the cost is further reduced, and the application range of the product is enhanced, for example, in application scenes requiring small leakage current, such as smart phones, network communication equipment, medical equipment and the like.
Drawings
FIG. 1 is a circuit diagram of an application of the present invention;
FIG. 2 is a schematic diagram of the present invention;
FIG. 3 is a layout of the present invention;
FIG. 4 is a graph of a conduction test waveform for a prior art transformer configuration without a shield winding;
fig. 5 is a conduction test waveform diagram of the present invention.
Detailed Description
The technical solution and the advantages of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 2, the present invention provides a switching power supply transformer, which includes a primary winding N1, a secondary winding N2, and an auxiliary winding N4, wherein the primary winding N1 and the secondary winding N2 both adopt sequential winding methods, and the directions of the same-name ends of the two are opposite, the same-name ends of the primary winding N1 and the auxiliary winding N4 are adjacently disposed, and the different-name ends of the primary winding N1 and the auxiliary winding N4 are far away.
The improvement points of the utility model are that: the shielding winding N3 is further arranged, the shielding winding N3 is arranged between the secondary winding N2 and the auxiliary winding N4 in a three-wire parallel connection mode, the homonymous end of the shielding winding N3 is connected with the heteronymous end of the auxiliary winding N4, and the shielding winding N3 and the auxiliary winding N4 are arranged on the same layer; in this embodiment, the shielding winding N3 and the auxiliary winding N4 are wound in parallel by three wires and one more wire, the winding pins are close to each other by static points, and the magnetic core of the transformer is grounded through a conducting wire.
As shown in fig. 3, the winding process of the switching power supply transformer provided by this embodiment is as follows:
(1) the primary winding N1, the starting leg is: the pin position 8 of the transformer framework, the termination pin are: the pin position 1, the line footpath is: 0.08 × 20 stranded wires, and winding 36 circles clockwise; wrapping three layers of adhesive tapes;
(2) the starting leg of the secondary winding N2 is: flying wire 1, the termination leg is: flying wire 2, the line footpath is: 0.1 × 80 multistrand three-layer insulated wires, and winding 5 circles anticlockwise; wrapping three layers of adhesive tapes;
(3) shielding winding N3, the starting pin is: transformer skeleton pin2, termination pin: suspended, the wire diameter is: 0.17 x 3, winding 10 circles clockwise;
(4) auxiliary winding N4, the starting pin is: transformer skeleton pin7, termination pin: a pin position: 2, winding 4 circles clockwise with the wire diameter of 0.17 x 1; wrapping three layers of adhesive tapes;
(5) the magnetic core shield is a tinned wire with one end connected with the magnetic core and the other end connected with the pin1 of the transformer.
In summary, the application of the switching power transformer provided by the present invention can refer to the circuit shown in fig. 1, and the voltage difference of the dynamic voltage between the primary winding N1 and the secondary winding N2 is small; the shielding winding N3 is combined with the auxiliary winding N4 together, so that the space is saved, the winding space of the transformer can be fully utilized, meanwhile, the equivalent dynamic pressure difference between the shielding winding N3 and the auxiliary winding N4 is reduced, the actual measurement electromagnetic compatibility performance can be reduced by 5-10 dB under the same condition, and the reference of the figure 4 and the figure 5 can be realized simultaneously.
Description of the transformer quiescent and active points:
the voltage of the transformer pin is constant and is a static point, usually an anode or a cathode connected with an electrolytic capacitor, and the voltage of the transformer pin is rapidly changed and is a moving point, usually connected with a rectifier diode or a field effect transistor.
In this example, PIN1, PIN2, and FL1 are all dead points, and PIN7, PIN8, and FL2 are all active points.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (3)
1. A switching power supply transformer comprises a primary winding, a secondary winding and an auxiliary winding, wherein the primary winding and the secondary winding are sequentially wound, the directions of homonymous ends of the primary winding and the secondary winding are opposite, the homonymous ends of the primary winding and the auxiliary winding are adjacently arranged, and the heteronymous ends of the primary winding and the auxiliary winding are far away; the method is characterized in that: the shielding winding is arranged between the secondary winding and the auxiliary winding in a three-wire parallel connection mode, the homonymous end of the shielding winding is connected with the heteronymous end of the auxiliary winding, and the shielding winding and the auxiliary winding are arranged on the same layer.
2. A switching power supply transformer according to claim 1, characterized in that: the shielding winding and the auxiliary winding adopt a winding method of three lines and one line in parallel, and the winding hanging legs adopt a method of approaching static points.
3. A switching power supply transformer according to claim 1, characterized in that: the magnetic core of the transformer is grounded through a wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121572690.XU CN215988401U (en) | 2021-07-12 | 2021-07-12 | Switch power supply transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121572690.XU CN215988401U (en) | 2021-07-12 | 2021-07-12 | Switch power supply transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215988401U true CN215988401U (en) | 2022-03-08 |
Family
ID=80577207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121572690.XU Active CN215988401U (en) | 2021-07-12 | 2021-07-12 | Switch power supply transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215988401U (en) |
-
2021
- 2021-07-12 CN CN202121572690.XU patent/CN215988401U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Shen et al. | An improved stray capacitance model for inductors | |
| CN102231318A (en) | Method and transformer for reducing common-mode interference in sandwich winding transformer | |
| CN103323700B (en) | A kind of high-temperature superconductive cable exchanges resistance test system and test method thereof | |
| CN101236827A (en) | Method and product for solving the electromagnetic compatibility of no Y capacitance switch power transformer | |
| CN110212784B (en) | Passive element integration device for single-phase three-level AC/DC resonant converter | |
| CN112233888A (en) | Transformer device, switching power supply and power adapter | |
| CN104240917A (en) | Transformer for switching power supply of visual intercom system, and manufacturing method of transformer | |
| CN215988401U (en) | Switch power supply transformer | |
| CN202906761U (en) | Power supply circuit for high-voltage TSC trigger unit | |
| CN106856373A (en) | A kind of harmonic wave generation device | |
| CN106373751B (en) | high frequency transformer | |
| CN115331930B (en) | Magnetic integration hybrid distribution transformer with simple structure | |
| CN217486380U (en) | Filtering device for eliminating electric fast transient pulse group interference | |
| CN101951140B (en) | EMI (Electro-Magnetic Interference) filter of electrodeless fluorescent lamp with ultracrystalline filter coil CL+CL structure | |
| WO2022121226A1 (en) | Transformer | |
| CN104851575B (en) | A kind of pulse transformer | |
| CN205920866U (en) | Voltage adjustable power transformer | |
| CN215912039U (en) | Switching power supply circuit and power adapter | |
| CN216902480U (en) | PQ type high frequency transformer | |
| WO2020164085A1 (en) | Wire for use in transformer winding and transformer | |
| CN217822341U (en) | Small flyback switching power supply transformer | |
| CN216119885U (en) | Industrial frequency transformer integrating filtering reactance and isolation | |
| CN203150368U (en) | Shielding and isolating layer of high-power high-frequency impulse high-voltage rectifier transformer | |
| CN204257355U (en) | Transformer and winding structure thereof | |
| CN201766497U (en) | Electrodeless fluorescent lamp EMI filter of ultracrystalline filtering coil CL+CL structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 361000 unit 201, 46 Siming Industrial Park, Meixi Road, Tong'an District, Xiamen City, Fujian Province Patentee after: Xiamen Kesite Electronics Co.,Ltd. Country or region after: China Address before: 361000 unit 201, 46 Siming Industrial Park, Meixi Road, Tong'an District, Xiamen City, Fujian Province Patentee before: XIAMEN CASTEC ELECTRONIC INDUSTRY Co.,Ltd. Country or region before: China |
|
| CP03 | Change of name, title or address |