CN102226967A - Special electromagnetic compatibility method for Y capacitor removal - Google Patents
Special electromagnetic compatibility method for Y capacitor removal Download PDFInfo
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- CN102226967A CN102226967A CN201110091199XA CN201110091199A CN102226967A CN 102226967 A CN102226967 A CN 102226967A CN 201110091199X A CN201110091199X A CN 201110091199XA CN 201110091199 A CN201110091199 A CN 201110091199A CN 102226967 A CN102226967 A CN 102226967A
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Abstract
The invention discloses a special electromagnetic compatibility method for Y capacitor removal, which is applied to a switching power supply. The method uses a specially wound transformer as the transformer of a main power converting module. The specially wound transformer comprises a coil bracket, a primary winding, a secondary winding and a feedback winding, wherein the primary winding is divided into two-layer windings, the two-layer primary windings are respectively a first primary winding and a second primary winding; the first primary winding and the second primary winding are respectively wound on the coil bracket, the first primary winding is arranged on the innermost layer, and the second primary winding is arranged on the outermost layer; the secondary winding and the feedback winding are arranged between the first primary winding and the second primary winding, a shielding layer is wound between the secondary winding and the feedback winding and between the first primary winding and the second primary winding respectively. According to the invention, the method breaks the routine combination of the transformer structure in the main power converting module, so that the switching power supply circuit can be ensured to at least have above 6dB surplus capacity in an EMI (electro magnetic interference) test after removing the Y capacitor.
Description
Technical field
The present invention discloses a kind of method of electromagnetic compatibility of the Y of going electric capacity, particularly a kind of method that is applied in the special electromagnetic compatibility that removes Y electric capacity in the Switching Power Supply.
Background technology
In Switching Power Supply, need to adopt the high frequency turn-on and turn-off of power device to convert direct current to alternating current, because the operation of the high frequency conducting/shutoff of power device can cause the electric current that flows through and the quick variation of voltage, thereby producing higher voltage and current spike, is the main cause of the inner EMI of generation of Switching Power Supply.At present, remove or the EMI first-selection that reduces Switching Power Supply inside is to adopt to add the method that buffering attracts circuit, attract circuit to help reducing EMI, can produce too much power consumption, increase number of elements, PCB size and system cost etc. simultaneously though add buffering.Therefore generally, conventional way is to add stripper and Y electric capacity at system front end, still, produces leakage current because the existence of Y electric capacity can make between the input and output line.Metal-back adapter with Y electric capacity can allow the user that the danger of electric shock is arranged, and exists potential safety hazard, and therefore, each power supply manufacturer begins to release the design of various no Y capacitances.But, can bring very big difficulty to the design of EMI again behind the excision Y electric capacity.Frequently tremble the performance that also can improve EMI with warbled pulse width modulator though employing has, assurance adapter that can not be absolute must improve on circuit and transformer device structure by the test of EMI, just can make adapter satisfy the standard of EMI.
Summary of the invention
Shortcoming at above-mentioned switch power supply EMI of mentioning of the prior art and the dependence between the Y electric capacity, the invention provides a kind of method of the special electromagnetic compatibility that removes Y electric capacity newly, it adopts the transformer of the transformer of special coiling as main Power Conversion module, has solved the problems referred to above.
The present invention solves the technical scheme that its technical problem adopts: a kind of method of the special electromagnetic compatibility that removes Y electric capacity, this method is to adopt the transformer of special coiling as main Power Conversion module transformer, the transformer of described special coiling comprises coil brace, elementary winding, secondary winding and feedback winding, elementary winding is divided into two-layer coiling, two-layer elementary winding is respectively the first elementary winding and the second elementary winding, the first elementary winding and the second elementary winding are wound on the coil brace respectively, the first elementary winding is arranged on innermost layer, the second elementary winding is arranged on outermost layer, secondary winding and feedback winding are arranged between the first elementary winding and the second elementary winding, are wound with screen respectively between secondary winding and feedback winding and the first elementary winding and the second elementary winding.
The technical scheme that the present invention solves its technical problem employing further comprises:
The described first elementary winding is arranged on innermost layer, the first elementary winding outside is provided with first screen, first screen outside is provided with secondary winding, the secondary winding outside is provided with the feedback winding, the feedback winding outside is provided with the secondary shielding layer, the secondary shielding layer outside is provided with the secondary shielding layer, and the secondary shielding layer outside is provided with the second elementary winding.
Between the described first elementary winding and first screen, between first screen and the secondary winding, between secondary winding and the feedback winding, between feedback winding and the secondary shielding layer and be respectively equipped with insulating tape between the secondary shielding layer and the second elementary winding.
Between the described first elementary winding and first screen, between feedback winding and the secondary shielding layer and the insulating tape between the secondary shielding layer and the second elementary winding be provided with two-layer.
Between described first screen and the secondary winding and the insulating tape between secondary winding and the feedback winding be provided with three layers.
The described second elementary winding outside is provided with insulating tape.
The insulating tape in the described second elementary winding outside is provided with three layers.
The described first elementary winding is identical with the number of turns of the second elementary winding technique.
Described secondary winding and feedback winding adopt the evenly coiling side by side of many copper cash, not stackable coiling, and just around full one whole layer.
The described first elementary winding and the second elementary winding are wound with two-layer respectively, the first elementary winding and the second elementary winding centre position are respectively equipped with barricade, the first elementary winding adopts the relative coiling of two lines respectively with the second elementary winding, by in the lateral outside returning again to the middle barricade side transformer outlet pin place.
The invention has the beneficial effects as follows: the circuit structure that adopts Switching Power Supply of the present invention is based on common circuit of reversed excitation, the present invention is by the broken conventional combination to the transformer device structure in the main Power Conversion module, make the EMI of switching power circuit after removing Y electric capacity test the allowance that guarantees at least more than the 6dB, practical, and the conventional way of every function has had better lifting, and simplified designed lines, effectively reduce cost, broken through the dependence between EMI and the Y electric capacity, avoided the user to use the adapter that adds Y electric capacity to exist and produced the danger that leakage current gets an electric shock between the input and output line.
The present invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is an application circuit block diagram of the present invention.
Fig. 2 is a structural representation of the present invention.
Fig. 3 is an application circuit schematic diagram of the present invention.
Embodiment
Present embodiment is the preferred embodiment for the present invention, and other all its principles are identical with present embodiment or approximate with basic structure, all within protection range of the present invention.
A kind of transformer of special coiling that focuses on of the present invention is as main Power Conversion module transformer, the transformer of special coiling comprises coil brace, elementary winding, secondary winding and feedback winding, elementary winding is divided into two-layer coiling, two-layer elementary winding is respectively the first elementary winding and the second elementary winding, the first elementary winding and the second elementary winding are wound on the coil brace respectively, the first elementary winding is arranged on innermost layer, the second elementary winding is arranged on outermost layer, secondary winding and feedback winding are arranged between the first elementary winding and the second elementary winding, are wound with screen respectively between secondary winding and feedback winding and the first elementary winding and the second elementary winding.In the present embodiment, coil brace adopts " worker " font coil brace, the first elementary winding is arranged on innermost layer, promptly the first elementary winding directly is wound on the coil brace, the first elementary winding outside is provided with first screen, in the present embodiment, be provided with insulating tape between the first elementary winding and first screen, the insulating tape between the first elementary winding and first screen is provided with two-layer; First screen outside is provided with secondary winding, in the present embodiment, is provided with insulating tape between first screen and the secondary winding, and the insulating tape between first screen and the secondary winding is provided with three layers; The secondary winding outside is provided with the feedback winding, in the present embodiment, is provided with insulating tape between secondary winding and the feedback winding, and the insulating tape between secondary winding and the feedback winding is provided with three layers; The feedback winding outside is provided with the secondary shielding layer, in the present embodiment, is provided with insulating tape between feedback winding and the secondary shielding layer, and the insulating tape between feedback winding and the secondary shielding layer is provided with two-layer; The secondary shielding layer outside is provided with the second elementary winding, in the present embodiment, is provided with insulating tape between the secondary shielding layer and the second elementary winding, and the insulating tape between the secondary shielding layer and the second elementary winding is provided with two-layer; In the present embodiment, the second elementary winding outside is provided with insulating tape, and the insulating tape in the second elementary winding outside is provided with three layers.In the present embodiment, first screen and secondary shielding layer adopt Copper Foil respectively, and first screen and secondary shielding layer are received the dead point of feedback winding respectively by lead, the main earth loop at the negative level of the big electric capacity of promptly elementary high pressure place.
In the present embodiment, during coiling, the first elementary winding is identical with the number of turns of the second elementary winding technique, promptly comprise 1/2 primary winding coil respectively, in the present embodiment, the first elementary winding and the second elementary winding adopt series connection interlayer technique for coiling, be wound with two-layer respectively, the first elementary winding and the second elementary winding centre position are respectively equipped with barricade, in the present embodiment, the barricade width is 2mm, and the first elementary winding adopts the relative coiling of two lines respectively with the second elementary winding, by in the lateral outside returning again to the middle barricade side transformer outlet pin place.In the present embodiment, secondary winding and feedback winding adopt the evenly coiling side by side of many copper cash, not stackable coiling, and just around full one whole layer.
Transformer among the present invention comprises 10 pins, wherein PIN1 connects input voltage after the rectification, the positive level of the big electric capacity of promptly elementary high pressure loop, place, and PIN2 is rising around pin of elementary winding, connect the Q1 switching tube and leak level on circuit, PIN3 is the connecting pin of the first elementary winding and the second elementary windings in series; PIN4 rises around pin for the feedback winding, be the output pin of feedback voltage, PIN5 is the dead point of feedback winding, and the big electric capacity of promptly elementary high pressure (is the capacitor C 3 in the accompanying drawing 3, it is connected on the output of rectifier bridge, plays rectified action) the main earth loop at negative level place.PIN6, PIN8, PIN10 are empty pin; PIN7 is rising around pin of secondary winding, is the output pin of secondary voltage, and PIN9 is the dead point of secondary winding, links to each other with secondary earth-return.
Please referring to accompanying drawing 1 and accompanying drawing 3, the switching power circuit of the transformer application among the present invention is identical with conventional switching power circuit, transformer application among the present invention is used as the transformer of the main Power Conversion module in the Switching Power Supply of routine, to play the usefulness of removing the reduction EMI behind the Y electric capacity.
The circuit structure that adopts Switching Power Supply of the present invention is based on common circuit of reversed excitation, the present invention is by the broken conventional combination to the transformer device structure in the main Power Conversion module, make the EMI of switching power circuit after removing Y electric capacity test the allowance that guarantees at least more than the 6dB, practical, and the conventional way of every function has had better lifting, and simplified designed lines, effectively reduce cost, broken through the dependence between EMI and the Y electric capacity, avoided the user to use the adapter that adds Y electric capacity to exist and produced the danger that leakage current gets an electric shock between the input and output line.
Claims (10)
1. the method for a special electromagnetic compatibility that removes Y electric capacity, it is characterized in that: described method is to adopt the transformer of special coiling as main Power Conversion module transformer, the transformer of described special coiling comprises coil brace, elementary winding, secondary winding and feedback winding, elementary winding is divided into two-layer coiling, two-layer elementary winding is respectively the first elementary winding and the second elementary winding, the first elementary winding and the second elementary winding are wound on the coil brace respectively, the first elementary winding is arranged on innermost layer, the second elementary winding is arranged on outermost layer, secondary winding and feedback winding are arranged between the first elementary winding and the second elementary winding, are wound with screen respectively between secondary winding and feedback winding and the first elementary winding and the second elementary winding.
2. the method for the special electromagnetic compatibility that removes Y electric capacity according to claim 1, it is characterized in that: the described first elementary winding is arranged on innermost layer, the first elementary winding outside is provided with first screen, first screen outside is provided with secondary winding, the secondary winding outside is provided with the feedback winding, the feedback winding outside is provided with the secondary shielding layer, and the secondary shielding layer outside is provided with the secondary shielding layer, and the secondary shielding layer outside is provided with the second elementary winding.
3. the method for the special electromagnetic compatibility that removes Y electric capacity according to claim 2 is characterized in that: between the described first elementary winding and first screen, between first screen and the secondary winding, between secondary winding and the feedback winding, between feedback winding and the secondary shielding layer and be respectively equipped with insulating tape between the secondary shielding layer and the second elementary winding.
4. the method for the special electromagnetic compatibility that removes Y electric capacity according to claim 3 is characterized in that: between the described first elementary winding and first screen, between feedback winding and the secondary shielding layer and the insulating tape between the secondary shielding layer and the second elementary winding be provided with two-layer.
5. the method for the special electromagnetic compatibility that removes Y electric capacity according to claim 3 is characterized in that: between described first screen and the secondary winding and the insulating tape between secondary winding and the feedback winding be provided with three layers.
6. the method for the special electromagnetic compatibility that removes Y electric capacity according to claim 2 is characterized in that: the described second elementary winding outside is provided with insulating tape.
7. the method for the special electromagnetic compatibility that removes Y electric capacity according to claim 6 is characterized in that: the insulating tape in the described second elementary winding outside is provided with three layers.
8. according to the method for any described special electromagnetic compatibility that removes Y electric capacity in the claim 1 to 7, it is characterized in that: the described first elementary winding is identical with the number of turns of the second elementary winding technique.
9. according to the method for any described special electromagnetic compatibility that removes Y electric capacity in the claim 1 to 7, it is characterized in that: described secondary winding and feedback winding adopt the evenly coiling side by side of many copper cash, not stackable coiling, and just around full one whole layer.
10. according to the method for any described special electromagnetic compatibility that removes Y electric capacity in the claim 1 to 7, it is characterized in that: the described first elementary winding and the second elementary winding are wound with two-layer respectively, the first elementary winding and the second elementary winding centre position are respectively equipped with barricade, the first elementary winding adopts the relative coiling of two lines respectively with the second elementary winding, by in the lateral outside returning again to the middle barricade side transformer outlet pin place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110091199.XA CN102226967B (en) | 2011-04-13 | 2011-04-13 | A kind of method of the special electromagnetic compatibility going Y capacitance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110091199.XA CN102226967B (en) | 2011-04-13 | 2011-04-13 | A kind of method of the special electromagnetic compatibility going Y capacitance |
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| CN102226967A true CN102226967A (en) | 2011-10-26 |
| CN102226967B CN102226967B (en) | 2016-07-06 |
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| CN201110091199.XA Active CN102226967B (en) | 2011-04-13 | 2011-04-13 | A kind of method of the special electromagnetic compatibility going Y capacitance |
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Cited By (7)
| 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 |
| CN103474210A (en) * | 2013-08-27 | 2013-12-25 | 崧顺电子（深圳）有限公司 | Transformer resistant to common code interference |
| CN104616870A (en) * | 2013-11-05 | 2015-05-13 | 林万炯 | Transformer free of Y capacitor |
| CN104795217A (en) * | 2015-05-08 | 2015-07-22 | 上海工程技术大学 | Power source high-frequency transformer winding method for micrometric displacement test system |
| CN105099205A (en) * | 2015-08-12 | 2015-11-25 | 矽力杰半导体技术(杭州)有限公司 | Switching power supply, flyback converter and transformer |
| CN113012904A (en) * | 2021-03-15 | 2021-06-22 | 广东迅扬科技股份有限公司 | Semi-winding main transformer and winding method thereof |
| CN113436865A (en) * | 2021-06-24 | 2021-09-24 | 珠海格力电器股份有限公司 | Transformer and switching power supply circuit |
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| GB553596A (en) * | 1940-11-14 | 1943-05-27 | Standard Telephones Cables Ltd | Inductance devices |
| US4518941A (en) * | 1983-11-16 | 1985-05-21 | Nihon Kohden Corporation | Pulse transformer for switching power supplies |
| CN1866423A (en) * | 2005-04-28 | 2006-11-22 | 松下电工株式会社 | Transformer |
| CN1949414A (en) * | 2006-09-29 | 2007-04-18 | 青岛三元集团股份有限公司 | Three layer insulation wire type high frequency 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 |
| CN201584272U (en) * | 2010-01-06 | 2010-09-15 | 福建新大陆通信科技有限公司 | Transformer improvement structure on power panel in set top box of digital television |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB553596A (en) * | 1940-11-14 | 1943-05-27 | Standard Telephones Cables Ltd | Inductance devices |
| US4518941A (en) * | 1983-11-16 | 1985-05-21 | Nihon Kohden Corporation | Pulse transformer for switching power supplies |
| CN1866423A (en) * | 2005-04-28 | 2006-11-22 | 松下电工株式会社 | Transformer |
| CN1949414A (en) * | 2006-09-29 | 2007-04-18 | 青岛三元集团股份有限公司 | Three layer insulation wire type high frequency transformer |
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Cited By (8)
| 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 |
| CN103474210A (en) * | 2013-08-27 | 2013-12-25 | 崧顺电子（深圳）有限公司 | Transformer resistant to common code interference |
| CN104616870A (en) * | 2013-11-05 | 2015-05-13 | 林万炯 | Transformer free of Y capacitor |
| CN104795217A (en) * | 2015-05-08 | 2015-07-22 | 上海工程技术大学 | Power source high-frequency transformer winding method for micrometric displacement test system |
| CN105099205A (en) * | 2015-08-12 | 2015-11-25 | 矽力杰半导体技术(杭州)有限公司 | Switching power supply, flyback converter and transformer |
| CN105099205B (en) * | 2015-08-12 | 2017-12-26 | 矽力杰半导体技术(杭州)有限公司 | Switching Power Supply, inverse excitation type converter and transformer |
| CN113012904A (en) * | 2021-03-15 | 2021-06-22 | 广东迅扬科技股份有限公司 | Semi-winding main transformer and winding method thereof |
| CN113436865A (en) * | 2021-06-24 | 2021-09-24 | 珠海格力电器股份有限公司 | Transformer and switching power supply circuit |
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| CN102226967B (en) | 2016-07-06 |
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Effective date of registration: 20161031 Address after: 518108 Guangdong city of Shenzhen province Nanshan District West Lisong Bai Lu Bai mang Cun San Tai Industrial Park 1 building, 7 floor Patentee after: Shenzhen Moso Power Electronics Technology Co., Ltd. Patentee after: Huizhou Maoshuo Energy Technology Co.,Ltd. Address before: 518108 Guangdong city of Shenzhen province Nanshan District West Lisong Bai Lu Bai mang Cun San Tai Industrial Park 1 building, 7 floor Patentee before: Shenzhen Moso Power Electronics Technology Co., Ltd. |