CN202013796U - Transformer without Y capacitance - Google Patents
Transformer without Y capacitance Download PDFInfo
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- CN202013796U CN202013796U CN2010207002734U CN201020700273U CN202013796U CN 202013796 U CN202013796 U CN 202013796U CN 2010207002734 U CN2010207002734 U CN 2010207002734U CN 201020700273 U CN201020700273 U CN 201020700273U CN 202013796 U CN202013796 U CN 202013796U
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Abstract
The utility model discloses a transformer without a Y capacitance, the transformer comprises a magnetic core, a primary main winding, a secondary winding, and an auxiliary winding successively winded on the magnetic core, and also comprises a primary shielding winding connected with the main winding, and a secondary shielding winding connected with the secondary winding; the primary shielding winding and the secondary shielding winding are provided with the same loop number and the same phase. The transformer without a Y capacitance solves two main problems of electromagnetic radiation and electric leakage in a switch power supply, and realizes that the switch power supply can pass through an electromagnetic radiation test without a Y capacitance; and is suitable for products quite sensitive to leakage current such as a mobile phone charger, etc.
Description
Technical field
The utility model relates to a kind of transformer device structure, relates in particular to a kind of transformer that reduces the no Y capacitance of electromagnetic radiation.
Background technology
The electromagnetic interference source signal is divided into differential mode and two kinds of forms of common mode, selects for use suitable differential mode inductance to form the JI mode filter, perhaps increases the problem that X electric capacity can solve differential mode.Common mode problem is more thorny, and too big from the cost that suppresses to start with merely, it is not obvious to produce effects, and need begin to deal with problems from the source.The common mode disturbances noise overwhelming majority of Switching Power Supply derives from transformer, the inner elementary high frequency noise of transformer is coupled to secondary by parasitic capacitance (as the C3 among Fig. 5), be coupled to conduction reception instrument or be radiated radio frequency reception instrument by the input and output wire rod with parasitic capacitance the earth by secondary again.Primary and secondary cross-over connection Y electric capacity, the common mode disturbances noise can form the loop by Y electric capacity, and effectively reduce common mode disturbances noise amplitude and address this problem, but the side effect that can produce leakage current.
Popular along with the metal shell mobile phone, leakage current is to the stimulation of human body during for fear of cell-phone charging, and no Y capacitance has become the universal demand to charger for mobile phone.The leakage current of Switching Power Supply is understood interference tones equipment in addition, produces the noise of low frequency, and this occasion also requires Switching Power Supply to remove Y electric capacity.Removing Y electric capacity, to satisfy the electromagnetic radiation relevant criterion again be a bigger challenge for the designing technique level and the manufacturing ability of manufacturer.
The utility model content
In order to solve the problems of the technologies described above, the utility model provides a kind of transformer of no Y capacitance, and it has removed the Y electric capacity in the transformer, thereby can prevent the generation of leaky, can reduce electromagnetic radiation again simultaneously.
The transformer of a kind of no Y capacitance of the present utility model, it comprises: magnetic core, elementary main winding, secondary winding and the auxiliary winding on this magnetic core successively, it also comprises the primary shield winding that is connected with described elementary main winding, the secondary shielding winding that is connected with described secondary winding; Described primary shield winding has the identical number of turns and same-phase with the secondary shielding winding.
Particularly, an end of described primary shield winding links to each other with the negative or positive electrode of described elementary main winding.One end of described secondary shielding winding links to each other with the negative or positive electrode of described secondary winding.The material of above-mentioned primary shield winding and secondary shielding winding is a Copper Foil; Preferably, the number of turns of above-mentioned primary shield winding and secondary shielding winding can be a circle, and its two ends separately do not link to each other.
Further, the transformer of above-mentioned no Y capacitance also comprises the second primary shield winding that is connected with elementary main winding; The one end links to each other with the negative or positive electrode of elementary main winding.
The utility model is not owing to adopting Y electric capacity to reduce the electromagnetic radiation of transformer, so leaky can not take place; The utility model is connected with secondary winding with elementary main winding respectively by coiling same number of turns and synchronous primary shield winding and secondary shielding winding; Make the effective capacitance of transformer reduce greatly, thereby make and to be coupled to secondary common mode disturbances electric current and to reduce greatly, thereby solve the problem of electromagnetic radiation from elementary.
Description of drawings
Fig. 1 is the application circuit of existing a kind of regular tap power supply;
Fig. 2 is the transformer application circuit in one embodiment of a kind of no Y capacitance of the utility model;
Fig. 3 is the transformer coiling schematic diagram in one embodiment of a kind of no Y capacitance of the utility model;
Fig. 4 is the transformer schematic diagram in one embodiment of a kind of no Y capacitance of the utility model;
Fig. 5 is the circuit diagram after simplifying at electromagnetic radiation.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, the utility model is described in further detail below in conjunction with accompanying drawing.
At first, begin to set forth realization principle of the present utility model from the capacitive-based present principles:
I＝C×(dV/dt)
In the above formula: I represents the electric current by electric capacity; C represents the capacity by electric capacity; DV/dt represents the capacitor voltage at both ends variable gradient.
If there is way to reduce the parasitic capacitance of transformer, also just can reduces electric current, thereby solve the problem of common mode disturbances noise by electric capacity.
Primary and secondary between the direct capacitance computing formula as follows:
Cox＝0.0886*Sx*ε/tx(pF)
Wherein Sx represents the relative area (cm^2) of capacitor plate; Tx represents the distance (cm) between the electric capacity two-plate; ε represent the to insulate dielectric constant of material
If increasing apart from tx between the electric capacity two-plate will cause leakage inductance to increase, decrease in efficiency, other problems such as temperature rising, the measure method that reduces direct capacitance is very limited, but can reduce effective capacitance by the relative current potential that reduces the parasitic capacitance two ends.
Effective capacitance computing formula between transformer is first and secondary is as follows:
Cy＝(Cox/3)*(Va^2+Va*Vb+Vb^2)/V^2
Wherein: Cox represents direct capacitance (pF); Va represents to be calculated the potential difference (V) of one end between the electric capacity two-plate; Vb represents to be calculated the potential difference (V) of the other end between the electric capacity two-plate; V represents to be calculated the average potential differences in electric capacity the two poles of the earth (V).
With reference to figure 3, the transformer of a kind of no Y capacitance of the present utility model, it comprises: magnetic core, elementary main winding 11, secondary winding 13 and the auxiliary winding 12 on this magnetic core successively, it also comprises the primary shield winding 21 that is connected with described elementary main winding 11, the secondary shielding winding 22 that is connected with described secondary winding 13; Described primary shield winding 21 has the identical number of turns and same-phase with secondary shielding winding 22.
Particularly, an end of described primary shield winding 21 links to each other with the negative or positive electrode of described elementary main winding 11.One end of described secondary shielding winding 22 links to each other with the negative or positive electrode of described secondary winding 13.Above-mentioned primary shield winding 21 is a Copper Foil with the material of secondary shielding winding 22; Preferably, the number of turns of above-mentioned primary shield winding and secondary shielding winding can be a circle, and its two ends separately do not link to each other.
Further, the transformer of above-mentioned no Y capacitance also comprises the second primary shield winding 23 that is connected with elementary main winding 11; The one end links to each other with the negative or positive electrode of elementary main winding 11.
With reference to figure 3 and Fig. 4, the transformer device structure of the utility model no Y capacitance, primary shield winding 21 and secondary shielding winding 22 same-phases among the figure, calculating effective capacitance in theory is zero, in fact be coupled to secondary common mode disturbances noise electric current and reduce greatly from elementary, thereby solve the problem of electromagnetic radiation.
The utility model has solved the equilibrium problem of Switching Power Supply electromagnetic radiation and electric leakage by the transformer device structure of innovation, has realized that Switching Power Supply does not need Y electric capacity to test by electromagnetic radiation easily.Be applicable to charger for mobile phone, the product that fixed station power supply etc. are quite responsive to leakage current.
With reference to figure 3 and Fig. 4, the manufacture method of the transformer of no Y capacitance of the present utility model process step in one embodiment is as follows:
A, coiling screen E1: with the wide Copper Foil of skeleton on skeleton around a circle, head and the tail can not short circuit, the head end solder taul connects transformer 1 pin;
B, the elementary main winding N1:1 of coiling pin hanging wire are once around intact N1, and ending closes at 3 pin;
C, the elementary main winding N2:4 of coiling pin hanging wire be once around intact N2, and ending closes at 5 pin, can be multi-thread and around, the even full whole skeleton width spaces of row;
D, the elementary main winding E2 of coiling: with the wide Copper Foil of skeleton on skeleton around a circle, head and the tail can not short circuit, the head end solder taul connects transformer 1 pin;
E, the elementary main winding E3 of coiling: with the wide Copper Foil of skeleton on skeleton around a circle, head and the tail can not short circuit, the head end solder taul connects transformer FLY1 pin;
F, coiling secondary winding N3:FLY1 pin hanging wire be once around intact N3, and ending closes at the FLY2 pin, can be multi-thread and around, the even full whole skeleton width spaces of row.
In order to guarantee good EMI effect, end of the same name should be placed on transformer the same side.In addition, very big flexibility is arranged in the transformation manufacturing process, more than only for reference, as limiting protection range of the present utility model.
The concrete application circuit that Fig. 2 implements for the utility model, Fig. 5 are the circuit after simplifying at electromagnetic radiation.
The utility model is not owing to adopting Y electric capacity to reduce the electromagnetic radiation of transformer, so leaky can not take place; The utility model is connected with secondary winding with elementary main winding respectively by coiling same number of turns and synchronous primary shield winding and secondary shielding winding; Make the effective capacitance of transformer reduce greatly, thereby make and to be coupled to secondary common mode disturbances electric current and to reduce greatly, thereby solve the problem of electromagnetic radiation from elementary.
Above disclosed only is a kind of preferred embodiment of the utility model, can not limit the interest field of the utility model certainly with this, and therefore the equivalent variations of being done according to the utility model claim still belongs to the scope that the utility model is contained.
Claims (6)
1. the transformer of a no Y capacitance, it comprises: magnetic core, elementary main winding, secondary winding and the auxiliary winding on this magnetic core successively, it is characterized in that, also comprise the primary shield winding that is connected with described elementary main winding, the secondary shielding winding that is connected with described secondary winding; Described primary shield winding has the identical number of turns and same-phase with the secondary shielding winding.
2. the transformer of no Y capacitance as claimed in claim 1 is characterized in that, an end of described primary shield winding links to each other with the negative or positive electrode of described elementary main winding.
3. the transformer of no Y capacitance as claimed in claim 2 is characterized in that, an end of described secondary shielding winding links to each other with the negative or positive electrode of described secondary winding.
4. the transformer of no Y capacitance as claimed in claim 3 is characterized in that, also comprises the second primary shield winding that is connected with described elementary main winding; The one end links to each other with the negative or positive electrode of described elementary main winding.
5. the transformer of no Y capacitance as claimed in claim 3 is characterized in that, the material of described primary shield winding and secondary shielding winding is a Copper Foil.
6. the transformer of no Y capacitance as claimed in claim 5 is characterized in that, the described primary shield winding and the secondary shielding winding number of turns are a circle, and its two ends separately do not link to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010207002734U CN202013796U (en) | 2010-12-31 | 2010-12-31 | Transformer without Y capacitance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010207002734U CN202013796U (en) | 2010-12-31 | 2010-12-31 | Transformer without Y capacitance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202013796U true CN202013796U (en) | 2011-10-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010207002734U Expired - Fee Related CN202013796U (en) | 2010-12-31 | 2010-12-31 | Transformer without Y capacitance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202013796U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102163492A (en) * | 2010-12-31 | 2011-08-24 | 崧顺电子（深圳）有限公司 | Transformer without Y capacitor and preparation method thereof |
| CN104240917A (en) * | 2014-09-26 | 2014-12-24 | 珠海市竞争电子科技有限公司 | Transformer for switching power supply of visual intercom system, and manufacturing method of transformer |
| CN106783099A (en) * | 2017-03-30 | 2017-05-31 | 深圳创维数字技术有限公司 | A kind of transformer and power supply adaptor |
| US9722499B2 (en) * | 2015-12-08 | 2017-08-01 | Power Integrations, Inc. | Energy transfer element with capacitor compensated cancellation and balance shield windings |
| EP3216034A4 (en) * | 2014-11-03 | 2018-07-04 | Hubbell Incorporated | Intrinsically safe transformers |
| WO2020248672A1 (en) * | 2019-06-14 | 2020-12-17 | 华为技术有限公司 | Planar transformer, power conversion circuit, and adapter |
-
2010
- 2010-12-31 CN CN2010207002734U patent/CN202013796U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102163492A (en) * | 2010-12-31 | 2011-08-24 | 崧顺电子（深圳）有限公司 | Transformer without Y capacitor and preparation method thereof |
| CN102163492B (en) * | 2010-12-31 | 2013-05-29 | 崧顺电子（深圳）有限公司 | Transformer without Y capacitor and preparation method thereof |
| CN104240917A (en) * | 2014-09-26 | 2014-12-24 | 珠海市竞争电子科技有限公司 | Transformer for switching power supply of visual intercom system, and manufacturing method of transformer |
| EP3216034A4 (en) * | 2014-11-03 | 2018-07-04 | Hubbell Incorporated | Intrinsically safe transformers |
| US9722499B2 (en) * | 2015-12-08 | 2017-08-01 | Power Integrations, Inc. | Energy transfer element with capacitor compensated cancellation and balance shield windings |
| CN106783099A (en) * | 2017-03-30 | 2017-05-31 | 深圳创维数字技术有限公司 | A kind of transformer and power supply adaptor |
| WO2020248672A1 (en) * | 2019-06-14 | 2020-12-17 | 华为技术有限公司 | Planar transformer, power conversion circuit, and adapter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160831 Address after: 425000 Industrial Road, Hexi Industrial Zone, Lingling Industrial Zone, Lingling District, Yongzhou, Hunan Patentee after: Hunan tech-power Technology Co., Ltd. Address before: 518000 Guangdong city of Shenzhen province Baoan District Fuyong street community baishixia Longwangmiao Industrial Zone sixteenth, nineteenth Patentee before: Songshun Electronic (Shenzhen) Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111019 Termination date: 20171231 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |