CN202736667U - Switching power supply transformer - Google Patents
Switching power supply transformer Download PDFInfo
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- CN202736667U CN202736667U CN 201220429754 CN201220429754U CN202736667U CN 202736667 U CN202736667 U CN 202736667U CN 201220429754 CN201220429754 CN 201220429754 CN 201220429754 U CN201220429754 U CN 201220429754U CN 202736667 U CN202736667 U CN 202736667U
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- winding
- power supply
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- secondary winding
- primary winding
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Abstract
The utility model discloses a switching power supply transformer which can effectively suppress electromagnetic interference generated by distributed capacitance between a primary winding and a secondary winding and improve electromagnetic compatibility of a switching power supply. The switching power supply transformer comprises a body, the primary winding and the secondary winding; the primary winding consists of an inner primary winding and an outer primary winding which are connected end to end and have the same number of turns, the inner primary winding is wound on the body, the secondary winding is wound on the inner primary winding, and the outer primary winding is wound on the secondary winding. Owning to arrangement of the primary winding and the secondary winding, most noise current can be offset mutually, strength of noise current coupled to the secondary winding finally is reduced greatly, and then transmission strength of electromagnetic interference (EMI) is decreased and the electromagnetic compatibility of the whole switching power supply is improved.
Description
Technical field
The utility model relates to transformer, refers more particularly to a kind of switching mode power supply transformer.
Background technology
Along with the develop rapidly of semiconductor technology, Switching Power Supply is used widely in the modern life, but along with the improving constantly of switching frequency, the Electro Magnetic Compatibility of Switching Power Supply (EMC) problem causes people's concern and attention day by day.The EMC design has become requisite important step in the Switching Power Supply development and Design.
The inhibition of Conducted Electromagnetic Interference (EMI) noise must just take at the product development initial stage.Generally, install filter additional at power input and can effectively suppress conduction (EMI) noise, but can increase cost; And filter can take larger space, so that the volume of Switching Power Supply also increases much.
Noise source is to produce one of main path of Conducted Electromagnetic Interference by the distributed capacitance between the primary and secondary winding of transformer (perhaps being parasitic capacitance) coupling, directly has influence on the Electro Magnetic Compatibility of Switching Power Supply.
The method for designing of traditional transformer EMC, be by between the primary and secondary winding (perhaps being primary and secondary coil) of transformer separator being set, the method that metallic spacer directly connects ground wire reduces the electromagnetic interference that the distributed capacitance between the primary and secondary winding of transformer produces.But such design can increase common mode noise current, so that the EMC degradation of Switching Power Supply.
The utility model content
Technical problem to be solved in the utility model is: the electromagnetic interference that a kind of distributed capacitance that can effectively suppress between its primary and secondary winding produces, the switching mode power supply transformer that improves the Electro Magnetic Compatibility of Switching Power Supply are provided.
For solving above-mentioned technical problem, the technical scheme that the utility model adopts is: switching mode power supply transformer, comprise: device body, armature winding and secondary winding, armature winding is made of the elementary inboard winding and the elementary outside winding that join end to end, the number of turns is suitable, elementary inboard winding winding is with it device, the secondary winding winding is on elementary inboard winding, and the winding winding of the elementary outside is on secondary winding.
Be arranged with interior auxiliary winding between described elementary inboard winding and the secondary winding, be arranged with outer auxiliary winding between secondary winding and the elementary outside winding.
The number of turns of described inside and outside auxiliary winding is suitable.
Described inside and outside auxiliary winding is serially connected and consists of auxiliary winding.
Described device body comprises: FERRITE CORE and the skeleton that is arranged on the FERRITE CORE.
The beneficial effects of the utility model are: the arrangement of primary and secondary winding of the present utility model, can so that most of noise current cancel out each other, can greatly reduce the noise current intensity that finally is coupled to secondary winding, especially common mode noise current intensity, thereby reduced the intensity of Conducted Electromagnetic Interference (EMI), improved Electro Magnetic Compatibility; Such installing filter or less filter is installed not, thus cost can have been reduced, reduce the volume of Switching Power Supply.In addition, also can place respectively interior auxiliary winding between elementary inboard winding and the secondary winding, outer auxiliary winding places secondary winding and elementary outside winding between, generally, inside and outside auxiliary winding is serially connected provides energy as an auxiliary winding for circuit, and need not be separately auxiliary winding complete set body and armature winding, thereby can reduce manufacturing cost.
Description of drawings
Fig. 1 is the broken section structural representation of transformer described in the utility model.
Among the figure: 1, skeleton, 2, the PC40 FERRITE CORE, 3, elementary inboard winding, 4, elementary outside winding, 5, interior auxiliary winding, 6, outer auxiliary winding, 7, secondary winding.
Fig. 2 is the noise pattern before and after transformer improves.
Wherein: (a) for the noise pattern of the transformer before improving, (b) be the noise pattern of the transformer after improving; (a) and (b): two parallel lines are respectively quasi-peak value detection limit value and the average value detection limit value that the B level requires in the CISPR22 standard, and curve is the conducted noise frequency spectrum of Switching Power Supply.
Embodiment
Below in conjunction with accompanying drawing, describe specific embodiments of the present utility model in detail.
As shown in Figure 1, switching mode power supply transformer described in the utility model, comprise: by PC40 FERRITE CORE 2 be arranged on device body that the skeleton 1 on the PC40 FERRITE CORE 2 consists of, the number of turns and quite (equate or differ from a circle, preferably equate) elementary inboard winding 3 and elementary outside winding 4 and secondary winding 7, the tail end of elementary inboard winding 3 links to each other with the head end of elementary outside winding 4 and forms armature winding, elementary inboard winding 3 windings are on skeleton 1, secondary winding 7 windings are on elementary inboard winding 3, and winding 4 windings of the elementary outside are on secondary winding 7.In the present embodiment, can also coiling be used for the auxiliary winding (perhaps being ancillary coil) to the control circuit IC power supply of Switching Power Supply, its concrete set-up mode is: half that will assist winding as interior auxiliary winding 5 windings between elementary inboard winding 3 and secondary winding 7, with second half of auxiliary winding as outer auxiliary winding 6 windings between secondary winding 7 and elementary outside winding 4.
In order to make things convenient for drawing of coil the end of a thread, during actual coiling, primary and secondary winding and auxiliary winding, all from Same Name of Ends around to the other end, and the coiling direction is identical.
After having installed auxiliary winding additional, on the one hand, because the existence of auxiliary winding provides extra approach to the propagation of noise current, but then, the interior auxiliary winding 5 of the auxiliary winding of formation and outer auxiliary winding 6 have increased the distance between elementary inboard winding 3 and secondary winding 7 and secondary winding 7 and the elementary outside winding 4, thereby just reduced the interlayer parasitic capacitance between elementary inboard winding 3 and elementary outside winding 4 and the secondary winding 7, so that noise current is reduced.Therefore, the increase of auxiliary winding is very little for the noise current intensity effect that finally is coupled to secondary winding 7.
Can find out from experimental result shown in Figure 2, compare with traditional transformer, transformer described in the utility model has more effectively common mode noise rejection ability, especially in the frequency range of intermediate frequency 1-5MHz.Than low-frequency range, conducted interference mainly is to be caused by differential mode interference; And in middle and high frequency range, common mode disturbances plays a leading role; Frequency range more than 10MHz mainly determines the EMC performance by other parasitic parameters in the circuit, and is little with the transformer relation.
Claims (5)
1. switching mode power supply transformer, comprise: device body, armature winding and secondary winding, it is characterized in that: described armature winding is made of the elementary inboard winding and the elementary outside winding that join end to end, the number of turns is suitable, elementary inboard winding winding is with it device, the secondary winding winding is on elementary inboard winding, and the winding winding of the elementary outside is on secondary winding.
2. switching mode power supply transformer as claimed in claim 1 is characterized in that: be arranged with interior auxiliary winding between described elementary inboard winding and the secondary winding, be arranged with outer auxiliary winding between secondary winding and the elementary outside winding.
3. switching mode power supply transformer as claimed in claim 2, it is characterized in that: the number of turns of described inside and outside auxiliary winding is suitable.
4. switching mode power supply transformer as claimed in claim 2 is characterized in that: described inside and outside auxiliary winding is serially connected and consists of auxiliary winding.
5. such as each described switching mode power supply transformer in the claim 1 to 4, it is characterized in that: described device body comprises: FERRITE CORE and the skeleton that is arranged on the FERRITE CORE.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220429754 CN202736667U (en) | 2012-08-28 | 2012-08-28 | Switching power supply transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220429754 CN202736667U (en) | 2012-08-28 | 2012-08-28 | Switching power supply transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202736667U true CN202736667U (en) | 2013-02-13 |
Family
ID=47662342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220429754 Expired - Fee Related CN202736667U (en) | 2012-08-28 | 2012-08-28 | Switching power supply transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202736667U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102789878A (en) * | 2012-08-28 | 2012-11-21 | 江苏索尔光电科技有限公司 | Transformer for switching mode power supply |
| CN104103408A (en) * | 2013-04-02 | 2014-10-15 | 宝辉科技（龙南）有限公司 | Transformer |
| CN109639128A (en) * | 2018-12-10 | 2019-04-16 | 广东工业大学 | Method of the optimization transformer device structure to reduce inverse-excitation type switch power-supply conduction common mode interference |
-
2012
- 2012-08-28 CN CN 201220429754 patent/CN202736667U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102789878A (en) * | 2012-08-28 | 2012-11-21 | 江苏索尔光电科技有限公司 | Transformer for switching mode power supply |
| CN104103408A (en) * | 2013-04-02 | 2014-10-15 | 宝辉科技（龙南）有限公司 | Transformer |
| CN109639128A (en) * | 2018-12-10 | 2019-04-16 | 广东工业大学 | Method of the optimization transformer device structure to reduce inverse-excitation type switch power-supply conduction common mode interference |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130213 Termination date: 20150828 |
|
| EXPY | Termination of patent right or utility model |