CN101236827A - Method and product for solving the electromagnetic compatibility of no Y capacitance switch power transformer - Google Patents
Method and product for solving the electromagnetic compatibility of no Y capacitance switch power transformer Download PDFInfo
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- CN101236827A CN101236827A CNA2007100739456A CN200710073945A CN101236827A CN 101236827 A CN101236827 A CN 101236827A CN A2007100739456 A CNA2007100739456 A CN A2007100739456A CN 200710073945 A CN200710073945 A CN 200710073945A CN 101236827 A CN101236827 A CN 101236827A
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Abstract
The invention relates to a method and a device adopted by a transformer of a switch power with no Y capacitor for solving electromagnetic compatibility. The method comprises the following steps that: a magnetic core is first tightly enclosed with at least one layer of shield winding; Z type windings are adopted between various layers of primary winding, and the layers of primary winding have the same winding direction; a layer of shield winding formed by two enamel covered wires and a layer of open shield layer of copper sheets are winded on the outside of the primary winding; and auxiliary winding covers the open shield layer of copper sheets. With the method of the invention, because the Y capacitor does not exist, the switch power has the characteristics of small leakage current and safety and reliability and meets the requirement that the transmission, radiation, vertical checkout and horizontal checkout of the switch power are in accordance with standards.
Description
Technical field
The present invention relates to supply unit, particularly Switching Power Supply reduces (EMI) concrete grammar and the product of electromagnetic interference.
Background technology
In the Switching Power Supply, because main power device is operated on off state, its voltage and current waveform contains abundant high order harmonic.Di/dt and dv/dt can produce the electromagnetic field of alternation in circuit and magnetic element fast for these.Because transformer is non-ideal element, between the winding and winding of transformer, all can there be distributed capacitance between same winding the inside circle and the circle, just make the electromagnetic field of this alternation can be coupled to the secondary of Switching Power Supply.And power supply is secondary the earth is also existed distributed capacitance, therefore can form the loop of common mode disturbances.
In order to solve the problem of Electromagnetic Compatibility, generally all be to adopt the common mode filter that adds some electric capacity and inductance composition, the interference that decays and pass; Shield at the inner EMI of increasing of transformer simultaneously,, alleviated the generation that EMI disturbs from the source to reduce the coupling capacitance between different windings.Simultaneously, also need between primary and secondary, add Y electric capacity.By adding Y electric capacity (as shown in fig. 1), can strengthen the high-frequency coupling between the primary and secondary, change the frequency breakover point, obtain the effect of good restraining EMI electromagnetic interference.But, owing to introduced Y electric capacity, make to have had the AC coupled path between the primary and secondary, correspondingly can produce certain leakage current, make the power supply user that the potential risk of electric shock be arranged.Therefore be not suitable for being used in to the extremely strict occasion of leakage current requirement, as some medical power supplys, communication power supply etc.
When the harm that solution Y electric capacity is brought, the solution that some cancellation Y electric capacity are also arranged, for example: the solution disclosed in the Chinese patent application 200510111106.X " low interference transformer ", this scheme be at the beginning of, the screen that adds metal strip between the secondary coil, this scheme has only provided the imagination of some solutions, and how to be provided with for screen, do not provide concrete scheme, as everyone knows, the effect how screen is provided with transformer inhibition EMI electromagnetic interference is very important, because the coupling of the electromagnetic interference between the primary and secondary is mainly produced by the parasitic parameter of transformer inside, because the parasitic parameter of transformer is staggered complicated, and interacts, the factor of being disturbed is a lot, be easy to change, be not easy to obtain distributed capacitance numerical value accurately.Inappropriate setting not only can't solve the EMI electromagnetic interference problem, but also can play bad effect, and at the transformer of different capacity, the setting of screen and the setting of winding all are different, can not solve the problem of all models with a kind of method.In addition, also ignored an important techniques problem in the such scheme, be exactly only to have proposed in this scheme between primary and secondary coil, to add screen, and do not consider elementary winding current problems over the ground, so just make that the effect that solves the EMI electromagnetic interference is poor.
Summary of the invention
Switching mode power supply transformer solves the method and the product of Electro Magnetic Compatibility when the present invention is to provide a kind of no Y capacitance, the present invention adopts the mode that adds shielding winding and elementary winding employing " Z " font winding in elementary winding, reduce elementary winding to earth-current, the pressure reduction at elementary each layer of winding two ends is reduced, reduce the couple current of interlayer, solve the technical problem of Electro Magnetic Compatibility difference in the prior art.Employing increases the method for shielding winding in primary and secondary winding, further improve the jamproof effect of this Switching Power Supply.The present invention also is less than or equal to the concrete parameter proposition design of the following switching mode power supply transformer of 7W to power output, to solve the technical problem that does not have the specific design parameter in the prior art for the type Switching Power Supply.
The scheme that the present invention solves the problems of the technologies described above is: the method for switching mode power supply transformer solution Electro Magnetic Compatibility may further comprise the steps during this no Y capacitance:
A. select a magnetic core;
B. the elementary winding of coiling on magnetic core;
C. coiling secondary winding and additional winding;
D. transformer immersion oil; Described step B is divided into step by step following:
B
1. earlier close around one deck shielding winding at least on magnetic core, the one end is unsettled;
B
2. coat at least one layer insulating in this shielding winding outside;
B
3. the elementary winding in above-mentioned insulating barrier outside, this elementary winding is behind intact one deck, coat at least one layer insulating, and then then around following one deck, adopt " Z " type winding between each layer, and each layer around to identical, the high-pressure side of this elementary winding is connected with an other end of shielding winding, coats at least one layer insulating then outside elementary winding again;
Also be divided into step by step following among the described step C:
C
1. after step B finishes, shield winding with two enamelled wires around one deck, coat a layer insulating then in the outside of elementary winding;
C
2. at step C
1The basis on around the screen of one deck copper sheet, this screen is ringent, two limits of opening isolate with insulating tape, the outside coats a layer insulating again;
C
3. at step C
2Coiling secondary winding on the basis, this secondary winding adopts triple insulated wire, then outsourcing dielectric layers at least;
C
4. at step C
3The auxiliary winding of coiling on the basis, an end of auxiliary winding is by lead Connection Step A
2Described in the outer copper sheet screen that is coated of magnetic core, the outside of auxiliary winding coats a layer insulating again;
C
5. at step C
4After finishing, coat dielectric layers at least in the magnetic core outside that is wound with each winding; Coat the screen of copper sheet again, this screen is the opening shape, and two limits of opening isolate with insulating tape, and last outside coats dielectric layers at least again.
Adopt between elementary winding and the magnetic core method that increases the shielding winding, can reduce elementary winding to earth-current.Elementary winding adopts " Z " font winding, be exactly when one deck after intact, with the end of a thread recall to start originally beyond, then around following one deck, this winding, can make between layer and the layer to be consistent substantially, help reducing the couple current of interlayer, the generation of minimizing electromagnetic interference in the voltage difference of a certain end.Between the primary and secondary winding except that around the Copper Foil screen, also add a shielding winding, further strengthen shield effectiveness, between each winding layers and the layer, all carry out insulation processing between each winding, each other interference of minimizing.After all winding technique is finished, can also increase one deck Copper Foil screen outside, strengthen shield effectiveness.
The present invention is directed to small-power switching power-supply commonly used in the life, promptly power output has also proposed concrete design parameter in 7W and the Switching Power Supply below the 7W, described step B
1, B
3, C
1Or C
4In shielding winding, elementary winding or the triple insulated wire coiling of adopting Φ 0.1～0.2mm of auxiliary winding; Described step C
3Middle secondary winding adopts the enamelled wire coiling of Φ 0.4mm.The number of turn of described elementary winding is between 130～160 circles; The number of turn of elementary winding is between 8～10 circles; The number of turn of auxiliary winding is between 12～16 circles.
Product design scheme proposed by the invention is: the anti-interference switch power supply of this no Y capacitance, the shell, circuit arrangement and the transformer that comprise Switching Power Supply, described transformer includes magnetic core, elementary winding, secondary winding and the auxiliary winding on this magnetic core successively, also includes the screen group and the insulating barrier group of flake conductive material; Also be provided with shield coil set in this transformer, be wound with the shielding of first in shield coil set winding between described magnetic core and the elementary winding, one end of this first shielding winding is unsettled, the other end connects the high-pressure side of elementary winding, be that " Z " font winding is provided with and around to identical between each layer in the described elementary winding, first insulating barrier between each layer in being lined with the insulating barrier group; Every first screen that is lined with the screen group, this first screen connects arbitrary end of elementary winding by lead between described elementary winding and the secondary winding.
The inside of described elementary winding and secondary winding, first screen also is wound with the secondary shielding winding in the shield coil set, and this secondary shielding winding is by the parallel coiling of two enamelled wires, second insulating barrier in this winding outsourcing insulating layer coating group.Described auxiliary winding outside also is provided with the secondary shielding layer of the 3rd insulating barrier in the dielectric layers group at least, screen group and the 4th insulating barrier in the dielectric layers group at least.
The present invention adopts said method, owing to there is not Y electric capacity, it is minimum that this Switching Power Supply has leakage current, safe and reliable characteristics.Simultaneously, guarantee that also conduction, radiation, every index vertical and horizontal checkout of this power supply all can satisfy the requirement of standard.
Description of drawings
Fig. 1 is Switching Power Supply and transformer principle figure.
Fig. 2 is a no Y capacitance anti-interference switch power transformer sectional schematic diagram of the present invention.
Fig. 3 is the sectional schematic diagram that the primary winding adopts " Z " font winding.
Fig. 4 is the schematic diagram of sheet screen user mode.
Fig. 5 a-5d is a product of the present invention at the figure as a result of conduction, radiation, vertical and horizontal checkout.
Embodiment
In conjunction with above-mentioned description of drawings each embodiment of the present invention.
Switching mode power supply transformer solves the method for electromagnetic interference during a kind of no Y capacitance, and this method may further comprise the steps:
A. select a magnetic core;
B. the elementary winding of coiling on magnetic core;
C. coiling secondary winding and additional winding;
D. transformer immersion oil; Described step B is divided into step by step following:
B
1. earlier close around one deck shielding winding at least on magnetic core, the one end is unsettled;
B
2. coat at least one layer insulating in this shielding winding outside;
B
3. at the elementary winding of above-mentioned insulating barrier outside coiling 130～160 circles, this elementary winding is behind intact one deck, coat at least one layer insulating, and then then around following one deck, adopt " Z " type winding between each layer, and each layer around to identical, the high-pressure side of this elementary winding is connected with an other end of shielding winding, coats at least one layer insulating then outside elementary winding again;
Also be divided into step by step following among the described step C:
C
1. after step B finishes, shield winding with two enamelled wires around one deck, coat a layer insulating then in the outside of elementary winding;
C
2. at step C
1The basis on around the screen of one deck copper sheet, this screen is ringent, two limits of opening isolate with insulating tape, the outside coats a layer insulating again;
C
3. at step C
2Coiling secondary winding on the basis, this secondary winding adopt triple insulated wire around 8～10 circles, then outsourcing dielectric layers at least;
C
4. at step C
3The auxiliary winding of coiling on the basis, auxiliary winding is around 12～16 circles, and an end of auxiliary winding is by lead Connection Step A
2Described in the outer copper sheet screen that is coated of magnetic core, the outside of auxiliary winding coats a layer insulating again;
C
5. at step C
4After finishing, coat dielectric layers at least in the magnetic core outside that is wound with each winding; Coat the screen of copper sheet again, this screen is the opening shape, and two limits of opening isolate with insulating tape, and last outside coats dielectric layers at least again.
Adopt between elementary winding and the magnetic core method that increases the shielding winding, can reduce elementary winding to earth-current.Elementary winding adopts " Z " font winding, be exactly when one deck after intact, with the end of a thread recall to start originally beyond, then around following one deck, this winding, can make between layer and the layer to be consistent substantially, help reducing the couple current of interlayer, the generation of minimizing electromagnetic interference in the voltage difference of a certain end.Between the primary and secondary winding except that around the Copper Foil screen, also add a shielding winding, further strengthen shield effectiveness, between each winding layers and the layer, all carry out insulation processing between each winding, each other interference of minimizing.After all winding technique is finished, can also increase one deck Copper Foil screen outside, strengthen shield effectiveness.
At 7W and the Switching Power Supply below the 7W, described step B
1, B
3, C
1Or C
4In shielding winding, elementary winding or the triple insulated wire coiling of adopting Φ 0.1～0.2mm of auxiliary winding; Described step C
3Middle secondary winding adopts the enamelled wire coiling of Φ 0.4mm.The number of turn of described elementary winding is between 130～160 circles; The number of turn of elementary winding is between 8～10 circles; The number of turn of auxiliary winding is between 12～16 circles.
By finding out among Fig. 2 and Fig. 3, a kind of anti-interference switch power supply of no Y capacitance, the shell, circuit arrangement and the transformer 100 that comprise Switching Power Supply, described transformer 100 includes magnetic core 10, elementary winding 20, secondary winding 30 and the auxiliary winding 40 on this magnetic core 10 successively, also includes the screen group 50 and the insulating barrier group 60 of flake conductive material; Also be provided with shield coil set 70 in this transformer 100, be wound with the shielding of first in the shield coil set 70 winding 71 between described magnetic core 10 and the elementary winding 20, one end of this first shielding winding 71 is unsettled, the other end connects the high-pressure side of elementary winding 20, be that " Z " font winding is provided with and around to identical between each layer in the described elementary winding 20, first insulating barrier 61 between each layer in being lined with insulating barrier group 60; Every first screen 51 that is lined with screen group 50, this first screen 51 connects arbitrary end of elementary winding 20 by lead between described elementary winding 20 and the secondary winding 30.The present invention adds the first shielding winding 71, and the parasitic capacitance of 20 pairs of magnetic cores 10 of elementary winding is weakened, thus the reducing of its generation to earth-current is also corresponding.What adopt between each layer of elementary winding 20 is " Z " shape winding, and the voltage difference between elementary winding 20 each layers of two ends is tended to balance, and also helps reducing couple current.
By among Fig. 2 as can be known, in order further to strengthen the effect of shielding, the inside of described elementary winding 20 and secondary winding 30, first screen 51 also is wound with the secondary shielding winding 72 in the shield coil set 70, this secondary shielding winding 72 is by the parallel coiling of two enamelled wires, second insulating barrier 62 in this winding outsourcing insulating layer coating group 60.
By among Fig. 2 as can be known, described auxiliary winding 40 outsides also are provided with the secondary shielding layer 52 of the 3rd insulating barrier 63 in the dielectric layers group 60 at least, screen group 50 and the 4th insulating barrier 64 in the dielectric layers group 60 at least, and this design can improve the bulk shielding effect of this product.
The present invention is directed to the small-power switching power-supply transformer of power supply adaptor coupling commonly used in the daily life, also proposed following concrete canonical parameter scope, the enamelled wire diameter of the elementary winding 20 of described coiling, auxiliary winding 40 and shield coil set 70 is Φ 0.1～0.2mm; Described coiling secondary winding 30 enamelled wire diameters are Φ 0.4mm.The number of turn of described elementary winding 20 is between 130～160 circles, and the number of turn of auxiliary winding 40 is between 12～16 circles, and the number of turn of secondary winding 30 is between 8～10 circles.Above-mentioned specification and parameter can be according to actual needs and the specification requirement of product and changing.
The concrete parameter list of 5V1A switching mode power supply transformer:
By finding out among Fig. 5 a-Fig. 5 d, the switching mode power supply transformer of making according to above-mentioned technical conditions can reach every test index of conduction, radiation, level and vertical checkout fully.
By among Fig. 4 as can be known, each screen is the opening shape in the described screen group 50, and is isolated with insulating material between the both sides of opening.
Claims (9)
1. switching mode power supply transformer solves the method for Electro Magnetic Compatibility during a no Y capacitance, and this method may further comprise the steps:
A. select a magnetic core;
B. the elementary winding of coiling on magnetic core;
C. coiling secondary winding and additional winding;
D. transformer immersion oil;
It is characterized in that: described step B is divided into step by step following:
B
1. earlier close around one deck shielding winding at least on magnetic core, the one end is unsettled;
B
2. coat at least one layer insulating in this shielding winding outside;
B
3. at the elementary winding of above-mentioned insulating barrier outside coiling, this elementary winding is behind intact one deck, coat at least one layer insulating, and then then around following one deck, adopt " Z " type winding between each layer, and each layer around to identical, the high-pressure side of this elementary winding is connected with an other end of shielding winding, coats at least one layer insulating then outside elementary winding again;
Also be divided into step by step following among the described step C:
C
1. after step B finishes, shield winding with two enamelled wires around one deck, coat a layer insulating then in the outside of elementary winding;
C
2. at step C
1The basis on around the screen of one deck copper sheet, this screen is ringent, two limits of opening isolate with insulating tape, the outside coats a layer insulating again;
C
3. at step C
2Coiling secondary winding on the basis, this secondary winding adopts triple insulated wire, then outsourcing dielectric layers at least;
C
4. at step C
3The auxiliary winding of coiling on the basis, an end of auxiliary winding is by lead Connection Step A
2Described in the outer copper sheet screen that is coated of magnetic core, the outside of auxiliary winding coats a layer insulating again;
C
5. at step C
4After finishing, coat dielectric layers at least in the magnetic core outside that is wound with each winding; Coat the screen of copper sheet again, this screen is the opening shape, and two limits of opening isolate with insulating tape, and last outside coats dielectric layers at least again.
2. method according to claim 1 is characterized in that: described step B
1, B
3, C
1Or C
4In shielding winding, elementary winding or the enamelled wire coiling of adopting Φ 0.1～0.2mm of auxiliary winding; Described step C
3Middle secondary winding adopts the triple insulated wire coiling of Φ 0.4mm.
3. method according to claim 2 is characterized in that: wherein the number of turn of elementary winding is between 130～160 circles; The number of turn of secondary winding is between 8～10 circles; Auxiliary winding is between 12～16 circles.
4. the anti-interference switch power supply of a no Y capacitance, shell, circuit arrangement and the transformer (100) that comprise Switching Power Supply, described transformer (100) includes magnetic core (10), elementary winding (20), secondary winding (30) and the auxiliary winding (40) on this magnetic core (10) successively, also includes the screen group (50) and the insulating barrier group (60) of flake conductive material; It is characterized in that: also be provided with shield coil set (70) in this transformer (100), be wound with the shielding of first in the shield coil set (70) winding (71) between described magnetic core (10) and the elementary winding (20), one end of this first shielding winding (71) is unsettled, the other end connects the high-pressure side of elementary winding (20), be that " Z " font winding is provided with and around to identical between each layer in the described elementary winding (20), first insulating barrier (61) between each layer in being lined with insulating barrier group (60); Every first screen (51) that is lined with screen group (50), this first screen (51) connects arbitrary end of elementary winding (20) by lead between described elementary winding (20) and the secondary winding (30).
5. according to the anti-interference switch power supply of the described no Y capacitance of claim 4, it is characterized in that: the inside of described elementary winding (20) and secondary winding (30), first screen (51) also is wound with the secondary shielding winding (72) in the shield coil set (70), this secondary shielding winding (72) is by the parallel coiling of two enamelled wires, second insulating barrier (62) in this winding outsourcing insulating layer coating group (60).
6. according to the anti-interference switch power supply of claim 4 or 5 described no Y capacitances, it is characterized in that: described auxiliary winding (40) outside also is provided with the 3rd insulating barrier (63) in the dielectric layers group (60) at least, the secondary shielding layer (52) of screen group (50) and the 4th insulating barrier (64) in the dielectric layers group (60) at least.
7. according to the anti-interference switch power supply of the described no Y capacitance of claim 4, it is characterized in that: the enamelled wire diameter of the elementary winding of described coiling (20), auxiliary winding (40) and shield coil set (70) is Φ 0.1～0.2mm; Described coiling secondary winding (30) enamelled wire diameter is Φ 0.4mm.
8. according to the anti-interference switch power supply of the described no Y capacitance of claim 4, it is characterized in that:
The number of turn of described elementary winding (20) is between 130～160 circles, and the number of turn of auxiliary winding (40) is between 12～16 circles, and the number of turn of secondary winding (30) is between 8～10 circles.
9. according to the anti-interference switch power supply of the described no Y capacitance of claim 4, it is characterized in that: each screen is the opening shape in the described screen group (50), and is isolated with insulating material between the both sides of opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100739456A CN101236827A (en) | 2007-03-30 | 2007-03-30 | Method and product for solving the electromagnetic compatibility of no Y capacitance switch power transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100739456A CN101236827A (en) | 2007-03-30 | 2007-03-30 | Method and product for solving the electromagnetic compatibility of no Y capacitance switch power transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101236827A true CN101236827A (en) | 2008-08-06 |
Family
ID=39920365
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100739456A Pending CN101236827A (en) | 2007-03-30 | 2007-03-30 | Method and product for solving the electromagnetic compatibility of no Y capacitance switch power transformer |
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| 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 |
| CN102226967A (en) * | 2011-04-13 | 2011-10-26 | 深圳茂硕电子科技有限公司 | Special electromagnetic compatibility method for Y capacitor removal |
| CN102479603A (en) * | 2010-11-25 | 2012-05-30 | 深圳市英威腾电气股份有限公司 | Drive transformer |
| CN102790522A (en) * | 2012-08-02 | 2012-11-21 | 西安华伟自控设备有限公司 | Realization method for high interference immunity power supply |
| CN103259399A (en) * | 2013-05-15 | 2013-08-21 | 山东超越数控电子有限公司 | Method for achieving power adapter electromagnetic compatibility |
| CN103309361A (en) * | 2013-06-03 | 2013-09-18 | 梁方民 | Tracking and aiming control method and device for heliostat |
| CN103489585A (en) * | 2013-09-25 | 2014-01-01 | 苏州康开电气有限公司 | High-radiation environment-friendly transformer |
| CN104616870A (en) * | 2013-11-05 | 2015-05-13 | 林万炯 | Transformer free of Y capacitor |
| CN105405606A (en) * | 2015-11-11 | 2016-03-16 | 铜陵瑞博电子科技有限公司 | EMI-ameliorated transformer |
| CN105513769A (en) * | 2016-01-29 | 2016-04-20 | 青岛海信电器股份有限公司 | Transformer and display device |
| CN106385185A (en) * | 2016-09-27 | 2017-02-08 | 青岛海信电器股份有限公司 | Flyback switching power source and method for improving electromagnetic compatibility of flyback switching power source |
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| CN109861561A (en) * | 2018-12-29 | 2019-06-07 | 深圳日辉达电源股份有限公司 | A kind of Switching Power Supply |
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| 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 |
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| CN102226967B (en) * | 2011-04-13 | 2016-07-06 | 深圳茂硕电子科技有限公司 | A kind of method of the special electromagnetic compatibility going Y capacitance |
| CN102226967A (en) * | 2011-04-13 | 2011-10-26 | 深圳茂硕电子科技有限公司 | Special electromagnetic compatibility method for Y capacitor removal |
| CN102790522A (en) * | 2012-08-02 | 2012-11-21 | 西安华伟自控设备有限公司 | Realization method for high interference immunity power supply |
| CN103259399A (en) * | 2013-05-15 | 2013-08-21 | 山东超越数控电子有限公司 | Method for achieving power adapter electromagnetic compatibility |
| CN103309361A (en) * | 2013-06-03 | 2013-09-18 | 梁方民 | Tracking and aiming control method and device for heliostat |
| CN103489585A (en) * | 2013-09-25 | 2014-01-01 | 苏州康开电气有限公司 | High-radiation environment-friendly transformer |
| CN104616870A (en) * | 2013-11-05 | 2015-05-13 | 林万炯 | Transformer free of Y capacitor |
| CN105405606A (en) * | 2015-11-11 | 2016-03-16 | 铜陵瑞博电子科技有限公司 | EMI-ameliorated transformer |
| CN105513769A (en) * | 2016-01-29 | 2016-04-20 | 青岛海信电器股份有限公司 | Transformer and display device |
| CN106385185A (en) * | 2016-09-27 | 2017-02-08 | 青岛海信电器股份有限公司 | Flyback switching power source and method for improving electromagnetic compatibility of flyback switching power source |
| WO2018201484A1 (en) * | 2017-05-05 | 2018-11-08 | 华为技术有限公司 | Transformer, and switching power supply |
| CN110301019A (en) * | 2017-05-05 | 2019-10-01 | 华为技术有限公司 | A kind of transformer and Switching Power Supply |
| EP3614405A4 (en) * | 2017-05-05 | 2020-06-03 | Huawei Technologies Co., Ltd. | Transformer, and switching power supply |
| US12046409B2 (en) | 2017-05-05 | 2024-07-23 | Huawei Technologies Co., Ltd. | Transformer and switch-mode power supply |
| CN109861561A (en) * | 2018-12-29 | 2019-06-07 | 深圳日辉达电源股份有限公司 | A kind of Switching Power Supply |
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