CN102163492B - Transformer without Y capacitor and preparation method thereof - Google Patents

Transformer without Y capacitor and preparation method thereof Download PDF

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Publication number
CN102163492B
CN102163492B CN 201010623530 CN201010623530A CN102163492B CN 102163492 B CN102163492 B CN 102163492B CN 201010623530 CN201010623530 CN 201010623530 CN 201010623530 A CN201010623530 A CN 201010623530A CN 102163492 B CN102163492 B CN 102163492B
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China
Prior art keywords
winding
transformer
coiling
capacitance
primary
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CN 201010623530
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CN102163492A (en
Inventor
刘佩阳
喻德茂
范继光
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Hunan tech-power Technology Co., Ltd.
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SONGSHUN ELECTRONIC (SHENZHEN) CO Ltd
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Priority to CN 201010623530 priority Critical patent/CN102163492B/en
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Abstract

The invention discloses a transformer without Y capacitor, comprising a magnetic core, a primary main winding, a secondary winding and an auxiliary winding, wherein the primary main winding, the secondary winding and the auxiliary winding are successively winded on the magnetic core. The transformer further comprises a primary shielded winding connected with the primary main winding and a secondary shielded winding connected with the secondary winding, wherein the primary shielded winding and the secondary shielded winding have the same number of loops and the same phase. The invention solves two main problems of electromagnetic radiation and electric leakage in a switch power supply at the same time, realizes that the switch power supply can pass an electromagnetic radiation test without Y capacitor, so the transformer is suitable for products fairly sensitive to leakage current, such as mobile phone chargers.

Description

Transformer of a kind of no Y capacitance and preparation method thereof
Technical field
The present invention relates to a kind of transformer device structure, relate 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 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 large from the cost that suppresses to start with merely, it is not obvious to produce effects, and need to 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 (such as the C3 among Fig. 5), be coupled to conduction reception instrument or be radiated the 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 mobile phone with metal shell, leakage current is to the stimulation of human body during for fear of cell-phone charging, and no Y capacitance has become the generally requirement 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 again the electromagnetic radiation relevant criterion be a larger challenge for designing technique level and the manufacturing ability of manufacturer.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of transformer of no Y capacitance, 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 invention, 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 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 present invention also provides a kind of preparation method of transformer of no Y capacitance, and it may further comprise the steps:
A, on magnetic core the elementary main winding of coiling;
B, at the auxiliary winding of described elementary main winding upside coiling;
C, at described auxiliary winding upside coiling primary shield winding, the one end is connected with an end of described elementary main winding;
D, coiling secondary shielding winding; Described primary shield winding has the identical number of turns and same-phase with the secondary shielding winding;
E, coiling secondary winding, the one end is connected with an end of secondary shielding winding;
Further, between steps A and B, also comprise step: the second primary shield winding that is connected with described elementary main winding in the coiling of described elementary main winding downside; The one end links to each other with the negative or positive electrode of described elementary main winding.
The present invention is not owing to adopting Y electric capacity to reduce the electromagnetic radiation of transformer, so leaky can not occur; The present invention 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; So that the effective capacitance of transformer reduces greatly, thereby so that be coupled to secondary common mode disturbances electric current and greatly reduce from elementary, thereby the problem of electromagnetic radiation solved.
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 present invention;
Fig. 3 is the transformer coiling schematic diagram in one embodiment of a kind of no Y capacitance of the present invention;
Fig. 4 is the transformer schematic diagram in one embodiment of a kind of no Y capacitance of the present invention;
Fig. 5 is the circuit diagram after simplifying for electromagnetic radiation.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
At first, begin to set forth realization principle of the present invention 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 the electric current by electric capacity, thereby solve the problem of common mode disturbances noise.
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, the 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 invention, 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 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 no Y capacitance of the present invention, primary shield winding 21 and secondary shielding winding 22 same-phases among the figure, calculating in theory effective capacitance is zero, in fact be coupled to secondary common mode disturbances noise electric current and greatly reduce from elementary, thereby solve the problem of electromagnetic radiation.
The present invention 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 a kind of no Y capacitance of the present invention 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 complete N1, and ending closes at 3 pin;
C, the elementary main winding N2:4 of coiling pin hanging wire are once around complete N2, and ending closes at 5 pin, but parallel winding of multiple coils evenly is booked whole skeleton width spaces;
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 are once around complete N3, and ending closes at the FLY2 pin, but parallel winding of multiple coils evenly is booked whole skeleton width spaces.
In order to guarantee good EMI effect, Same Name of Ends should be placed on transformer the same side.In addition, very large flexibility is arranged in the transformation manufacturing process, more than only for reference, as limiting protection scope of the present invention.
Fig. 2 is concrete application circuit of the invention process, and Fig. 5 is the circuit after simplifying for electromagnetic radiation.
The present invention is not owing to adopting Y electric capacity to reduce the electromagnetic radiation of transformer, so leaky can not occur; The present invention 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; So that the effective capacitance of transformer reduces greatly, thereby so that be coupled to secondary common mode disturbances electric current and greatly reduce from elementary, thereby the problem of electromagnetic radiation solved.
Above disclosed is a kind of preferred embodiment of the present invention only, certainly can not limit with this interest field of the present invention, and the equivalent variations of therefore doing according to claim of the present invention still belongs to the scope that the present invention is contained.

Claims (2)

1. the preparation method of the transformer of a no Y capacitance is characterized in that may further comprise the steps:
A, on magnetic core the elementary main winding of coiling;
B, at the auxiliary winding of described elementary main winding upside coiling;
C, at described auxiliary winding upside coiling primary shield winding, the one end is connected with an end of described elementary main winding;
D, coiling secondary shielding winding; Described primary shield winding has the identical number of turns and same-phase with the secondary shielding winding;
E, coiling secondary winding, the one end is connected with an end of secondary shielding winding.
2. the preparation method of the transformer of no Y capacitance as claimed in claim 1 is characterized in that, also comprises step between steps A and B: the second primary shield winding that is connected with described elementary main winding in the coiling of described elementary main winding downside; The one end links to each other with the negative or positive electrode of described elementary main winding.
CN 201010623530 2010-12-31 2010-12-31 Transformer without Y capacitor and preparation method thereof Expired - Fee Related CN102163492B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN102163492B true CN102163492B (en) 2013-05-29

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103093936B (en) * 2011-11-02 2016-06-08 施耐德电器工业公司 Transformer and winding method thereof
CN103165277B (en) * 2011-12-09 2016-11-09 比亚迪股份有限公司 Transformator and manufacture method thereof
CN103474210A (en) * 2013-08-27 2013-12-25 崧顺电子(深圳)有限公司 Transformer resistant to common code interference
CN108022730B (en) * 2016-11-01 2020-06-16 华为机器有限公司 Transformer and assembling method thereof
WO2018176301A1 (en) * 2017-03-30 2018-10-04 深圳创维数字技术有限公司 Transformer and power adapter
CN109639128B (en) * 2018-12-10 2021-08-31 广东工业大学 Method for reducing conducted common-mode interference of flyback switching power supply by optimizing transformer structure
CN111181404B (en) * 2019-07-01 2020-09-18 苏州纳芯微电子股份有限公司 Isolated power supply chip

Citations (3)

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CN1787130A (en) * 2005-12-02 2006-06-14 吴孟齐 Low interference transformer
CN101236827A (en) * 2007-03-30 2008-08-06 广州市中奕通讯设备有限公司 Method and product for solving the electromagnetic compatibility of no Y capacitance switch power transformer
CN202013796U (en) * 2010-12-31 2011-10-19 崧顺电子(深圳)有限公司 Transformer without Y capacitance

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JPH0917657A (en) * 1995-06-29 1997-01-17 Canon Inc Transformer and switching power supply device
US6995990B2 (en) * 2001-03-08 2006-02-07 Power Integrations, Inc. Method and apparatus for substantially reducing electrical earth displacement current flow generated by wound components
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Publication number Priority date Publication date Assignee Title
CN1787130A (en) * 2005-12-02 2006-06-14 吴孟齐 Low interference transformer
CN101236827A (en) * 2007-03-30 2008-08-06 广州市中奕通讯设备有限公司 Method and product for solving the electromagnetic compatibility of no Y capacitance switch power transformer
CN202013796U (en) * 2010-12-31 2011-10-19 崧顺电子(深圳)有限公司 Transformer without Y capacitance

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Effective date of registration: 20160902

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.

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Granted publication date: 20130529

Termination date: 20171231

CF01 Termination of patent right due to non-payment of annual fee