CN110415957A - Flyback sourse interlocks the shielding construction design method of winding transformer - Google Patents

Flyback sourse interlocks the shielding construction design method of winding transformer Download PDF

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Publication number
CN110415957A
CN110415957A CN201910542974.5A CN201910542974A CN110415957A CN 110415957 A CN110415957 A CN 110415957A CN 201910542974 A CN201910542974 A CN 201910542974A CN 110415957 A CN110415957 A CN 110415957A
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layer
side winding
transformer
primary side
shielding
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陈恒林
刘冠辰
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Zhejiang University ZJU
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Zhejiang University ZJU
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Regulation Of General Use Transformers (AREA)

Abstract

Interlock the shielding construction design method of winding transformer the invention discloses a kind of flyback sourse, this method not will increase the burden of filter design, and entire design process is using emulation and calculates, and not will increase additional Material Cost.In addition, The present invention reduces the weight and volumes of staggeredly winding transformer device；Shielded layer itself is relatively light, and thinner thickness, not will increase the weight or volume of transformer or entire power supply device；Common-mode noise is inhibited to a certain extent by double copper foil shielding layers suitable in Design of Transformer, is alleviated the design burden of common-mode filter, can suitably be reduced the weight and volume of filter, to reduce the weight and volume of whole device.Meanwhile the present invention is very significant for the inhibitory effect of common-mode noise；The double copper foil shielding layers of staggeredly winding transformer designed using the method for the present invention inhibit the common-mode noise of circuit of reversed excitation load-side, considerably lower compared with using the common mode noise rejection effect of conventional screening layers.

Description

Flyback sourse interlocks the shielding construction design method of winding transformer
Technical field
The invention belongs to switching mode power supply transformer shield design techniques fields, and in particular to a kind of flyback sourse interlocks winding The shielding construction design method of transformer.
Background technique
Inverse-excitation type switch power-supply is due to being widely used in communication, service system and small-power electronic and setting with isolation features In standby, these equipment require to meet relevant electromagnetic compatibility (EMC) standard, therefore often have one in Switching Power Supply product design Fixed electromagnetic interference (EMI) filtering measures.And the switching characteristic become better and better along with switching device, high dv/dt and di/dt Serious EMI problem is brought, on the one hand these serious EMI problems can make power supply product be difficult to reach related EMC standard, another Even if aspect reaches related EMC standard, also common-mode noise can be formed in more sensitive load-side sometimes, electronic load is caused sternly It interferes again.
Staggeredly winding refer to for primary side being divided into two parts and secondary coil is clipped in the middle (or vice versa) transformer around Mode processed；If taking former-secondary-former staggeredly winding compared with traditional winding, staggeredly winding increases effective coupling on former secondary side Area is closed, transformer leakage inductance can be substantially reduced, reduce the spike of switching tube；But due to thering are two to connect between former secondary side Contacting surface, structure capacitive can increase accordingly between winding, and EMI level will increase compared to traditional winding.
Common mode interference is inhibited using filter to reduce EMI level, but increases the volume of power supply device And weight；As shown in Figure 1, the common mode interference source with the staggeredly inverse-excitation type switch power-supply of winding transformer includes: primary side The dv/dt and di/dt that MOSFET and secondary side diode are generated in switch motion.It is suitable in staggeredly winding transformer interior design Double layer screen layer can effectively reduce the common mode current in transformer, thus in the feelings for not increasing filter volume and weight The level of common-mode noise is reduced under condition.
Shielded layer physical parameter in transformer mainly includes the width w of the double-deck copper foil shielding layersh1、wsh2, such as Fig. 2 institute Show, when shielded layer is placed in magnetic core of transformer window between two parties, the design method of the double-deck copper foil shielding layer is primarily referred to as to this copper foil The design of shielding width reaches the method for the inhibitory effect best to EMI.
Theoretically if fixing the length of shielded layer, thickness and position, appropriate adjustment width can make in transformer Common mode current it is minimum, thus by the common mode noise rejection of load-side to floor level, but how quantitative design this index It is difficult to quickly and effectively realize.
Summary of the invention
In view of above-mentioned, interlock the shielding construction design method of winding transformer the present invention provides a kind of flyback sourse, it should Method not will increase the burden of filter design, and entire design process is using emulation and calculates, not will increase additional material at This.
A kind of flyback sourse interlocks the shielding construction design method of winding transformer, includes the following steps:
(1) structural parameters and electric parameter of transformer, and initializing set Transformer shielding layer are obtained by measurement Position is at magnetic core window center；
(2) the inside transformer original vice-side winding under each shielding construction design scheme is simulated using finite element analysis software Structure capacitive data between shielded layer；
(3) the structure capacitive data obtained according to above-mentioned emulation calculate the transformer under each shielding construction design scheme Common mode assess equivalent capacity；
(4) the corresponding common mode assessment the smallest one group of shielding construction design scheme of equivalent capacity is taken, and according to this to transformer screen A layer structure is covered to be designed.
Further, before to the design of Transformer shielding layer, the length of shielded layer is set as its circumference, shielded layer Thickness is then depending on the material thickness selected by its reality, therefore the two parameters are chosen to be constant in advance.
Further, the transformer from magnetic core it is radial successively by first layer primary side winding, first screen layer, secondary side around Group, secondary shielding layer, second layer primary side winding are interlocked coiling.
Further, every group of shielding construction design scheme contains first screen layer and the respective width of secondary shielding layer Degree.
Further, the structure capacitive data between the inside transformer original vice-side winding and shielded layer include: first The structure capacitive between structure capacitive, first layer primary side winding and vice-side winding between layer primary side winding and first screen layer, Structure capacitive, second layer primary side winding between second layer primary side winding and secondary shielding layer and the electricity of the structure between vice-side winding Hold, the structure capacitive between the structure capacitive between vice-side winding and first screen layer, vice-side winding and secondary shielding layer.
Further, the design is calculated by the following formula for any shielding construction design scheme in the step (3) The common mode of transformer assesses equivalent capacity under scheme；
Wherein: CkEquivalent capacity is assessed for the common mode of transformer, w is magnetic core window width, wsh1For the width of first screen layer Degree, wsh2For the width of secondary shielding layer, h1For first screen layer bottom margin to the distance of bottom magnetic core framework, h2For the second screen Cover distance of layer bottom margin to bottom magnetic core framework, NPFor the total number of turns of first layer primary side winding and second layer primary side winding, NS For the number of turns of vice-side winding, NxFor the number of turns of first layer primary side winding, CpsBetween first layer primary side winding and vice-side winding Structure capacitive, CqsStructure capacitive between second layer primary side winding and vice-side winding, CpshFor first layer primary side winding and the first screen Cover the structure capacitive between layer, CqshFor the structure capacitive between second layer primary side winding and secondary shielding layer, CspFor vice-side winding With the structure capacitive between first layer primary side winding, CsqFor the structure capacitive between vice-side winding and second layer primary side winding, NQ0 And ND0It is constant.
The constant NQ0And ND0It is calculated and is determined by following relationship:
Wherein: UQ0For the potential of primary side winding Same Name of Ends, UD0For the potential of vice-side winding Same Name of Ends, vPFor primary side winding two Hold the instantaneous value of voltage, vSFor the instantaneous value of vice-side winding both end voltage, t is the time.
Further, the first screen layer and secondary shielding layer are all made of gum copper foil, and copper foil width regards magnetic core window Depending on width.
Compared with prior art, the present invention has following advantageous effects:
The winding transformer device simple possible 1. the present invention is interlocked, it is at low cost.Polymeric barrier layer materials are 0.05mm copper foil, cost It is low, and be easy to buy, the transformer after designing only increases shielding copper foil layer in structure, and device is compared to filter It designs simpler.Compared with traditional winding transformer shielded layer, the method for the present invention, which relies solely on, changes first layer, second layer copper foil The width of shielded layer is achieved that the inhibition to common-mode noise, will not additionally increase product cost.
2. The present invention reduces the weight and volumes of staggeredly winding transformer device.Shielded layer itself is relatively light, and thickness compared with It is thin, it not will increase the weight or volume of transformer or entire power supply device；Pass through double copper foils for shielding suitable in Design of Transformer Layer inhibits common-mode noise to a certain extent, alleviates the design burden of common-mode filter, can suitably reduce filter Weight and volume, to reduce the weight and volume of whole device.
3. the present invention is very significant for the inhibitory effect of common-mode noise.Using the method for the present invention design staggeredly around The double copper foil shielding layers of method transformer inhibit the common-mode noise of circuit of reversed excitation load-side, with the common mode using conventional screening layers Noise suppression effect is compared to considerably lower.
Detailed description of the invention
Fig. 1 is the common mode current propagation path schematic diagram of the inverse-excitation type switch power-supply with staggeredly winding transformer.
Fig. 2 is the schematic diagram of internal structure of staggeredly winding transformer.
Fig. 3 is the structure capacitive distribution schematic diagram between former vice-side winding and double copper foil shielding layers.
Fig. 4 (a) is to assess equivalent capacity C about common modekIt is 10mm wide corresponding to shielded layer N5, shielded layer N3 is by 8mm wide Increase to the indicatrix schematic diagram in 13mm wide situation.
Fig. 4 (b) is to assess equivalent capacity C about common modekIt is 11mm wide corresponding to shielded layer N5, shielded layer N3 is by 8mm wide Increase to the indicatrix schematic diagram in 13mm wide situation.
Fig. 4 (c) is to assess equivalent capacity C about common modekIt is 12mm wide corresponding to shielded layer N5, shielded layer N3 is by 8mm wide Increase to the indicatrix schematic diagram in 13mm wide situation.
Fig. 4 (d) is to assess equivalent capacity C about common modekIt is 13mm wide corresponding to shielded layer N5, shielded layer N3 is by 8mm wide Increase to the indicatrix schematic diagram in 13mm wide situation.
Fig. 5 (a) is the common-mode noise actual measurement of the staggeredly flyback converter of winding transformer in the case of unshielded layers Result schematic diagram.
Fig. 5 (b) is that shielded layer N3 is 13mm, the inverse-excitation converting with the winding transformer that interlocks in the case of shielded layer N5 is 13mm The common-mode noise actual measured results schematic diagram of device.
Fig. 5 (c) is that shielded layer N3 is 12mm, the inverse-excitation converting with the winding transformer that interlocks in the case of shielded layer N5 is 12mm The common-mode noise actual measured results schematic diagram of device.
Fig. 5 (d) is that shielded layer N3 is 11mm, the inverse-excitation converting with the winding transformer that interlocks in the case of shielded layer N5 is 11mm The common-mode noise actual measured results schematic diagram of device.
Fig. 5 (e) is that shielded layer N3 is 10mm, the inverse-excitation converting with the winding transformer that interlocks in the case of shielded layer N5 is 10mm The common-mode noise actual measured results of device.
Fig. 5 (f) is that shielded layer N3 is 10mm, the inverse-excitation converting with the winding transformer that interlocks in the case of shielded layer N5 is 13mm The common-mode noise actual measured results of device.
Specific embodiment
In order to more specifically describe the present invention, with reference to the accompanying drawing and specific embodiment is to technical solution of the present invention It is described in detail.
Flyback sourse of the present invention interlocks the design method of winding transformer shielding construction, is emulated by finite element analysis software Out between the structure capacitive under the different in width of double copper foil shielding layers between original-pair-primary winding and former vice-side winding and shielded layer Structure capacitive, recycle common mode current assessment formula shielded layer width when calculating common mode current minimum, specifically include as follows Step:
(1) Estimation and Measurement interlocks the structures rulers such as coil diameter, double copper foil shielding layer thickness, the winding spacing of winding transformer It is very little.
Structure capacitive between interlaced transformer winding winding and shielded layer is related with winding construction and shielding layer structure, because This needs the fixed each structural parameters of winding transformer that interlock；According to the magnetic core of the good transformer of the Demand Design of power supply device, air gap, After winding method, umber of turn and line footpath, winding is estimated according to the thickness of winding wire diameter, insulating tape thickness, shielded layer Spacing between width and winding.For convenient for control winding width and position consistency, transformer winding is carried out close coiling, Coiling starting point be equal away from the vertical distance of transformer window bottom end (or directly by winding since transformer window bottom end around System).
(2) shielding thickness is 0.05mm, and shielded layer is arranged at magnetic core window central location, soft using finite element analysis Part simulates in the case where different shielded layer width, staggeredly the structure capacitive between winding transformer original vice-side winding and former pair Structure capacitive between side winding and shielding copper foil layer, as shown in Figure 3.
Between transformer winding and winding and shielding interlayer structure capacitive it is related with winding construction and shielding layer structure, it may be assumed that
Wherein: icmIt is the common mode current staggeredly flowed through in winding transformer.Therefore the base of staggeredly winding transformer is set After this parameter, structure capacitive only with the width w of shielded layersh1、wsh2It is related, double copper foil screens are simulated by finite element analysis software The structure capacitive under layer different in width is covered, can be used to the inhibition situation for assessing the common mode current under different copper foil shielding layer width.
(3) it calculates the common mode under different double copper foil shielding layer width in transformer and assesses equivalent capacity Ck, and draw out altogether Mould assesses equivalent capacity CkIndicatrix about double copper foil shielding layer change widths.
Bring corresponding simulation architecture capacitor under operable double copper foil shielding layer width all in step (2) into above-mentioned meter Calculate formula, available all common mode assessment equivalent capacitys for operating transformer under double copper foil shielding layer width.
(4) shielded layer width when common mode assessment equivalent capacity minimum is acquired according to the indicatrix drawn out, and is as pressed down The best shielded layer width of transformer common mode current processed.
Example is designed below in conjunction with the Transformer shielding layer of inverse-excitation type switch power-supply, the specific embodiment of the invention is done It is described in further detail.
The transformer device structure used in present embodiment is as shown in Fig. 2, primary side winding promising N2 and N6, vice-side winding are N4, wherein primary side is divided into N21 and two layers of N22 again, and N3 and N5 are respectively the double-deck copper foil shielding layer, and N7 is auxiliary winding；It is each former secondary The physical parameter of side winding and each shielded layer physical parameter are as shown in table 1:
Table 1
Parameter Value Parameter Value
N21,N22 12 circles N4 9 circles
N6 10 circles N7 5 circles
w 13mm wsh1,wsh2 4~13mm
The structure capacitive of inside transformer original-pair-primary winding and the double-deck copper foils for shielding can pass through finite element analysis software Emulation obtains, and all schemes are substituted into C by the structure capacitive that simulation calculation obtainskCalculation formula, can be obtained respective Common mode assesses equivalent capacity Ck, then the assessment of the common mode by comparing all schemes equivalent capacity Ck, double copper foil shielding layers can be obtained The staggeredly optimization design scheme of winding transformer, as shown in Fig. 4 (a)~Fig. 4 (d).
In emulation, wsh1And wsh2Value when being chosen to be 10mm and 13mm respectively, common mode assesses equivalent capacity CkFor minimum value, Common mode assesses equivalent capacity CkCalculated result such as Fig. 4 (a)~Fig. 4 (d) shown in, from figure it is not difficult to find out that, wsh1And wsh2Value When being chosen to be 10mm and 13mm respectively, it is about 8.2pF or so that common mode, which assesses equivalent capacity, then optimal double copper foil shielding layer width is set It is calculated as 10mm and 13mm.Shown in common-mode noise such as Fig. 5 (a)~Fig. 5 (f) surveyed under each shielded layer width, by comparing flyback The test result of Switching Power Supply load-side common-mode noise can be verified, and the double copper foil shielding layers obtained using present embodiment are matched It is best to the inhibitory effect of common-mode noise to set method.
This hair can be understood and applied the above description of the embodiments is intended to facilitate those skilled in the art It is bright.Person skilled in the art obviously easily can make various modifications to above-described embodiment, and described herein General Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, Those skilled in the art's announcement according to the present invention, the improvement made for the present invention and modification all should be in protections of the invention Within the scope of.

Claims (8)

1. a kind of flyback sourse interlocks, the shielding construction design method of winding transformer, includes the following steps:
(1) structural parameters and electric parameter of transformer, and the position of initializing set Transformer shielding layer are obtained by measurement At magnetic core window center；
(2) inside transformer original vice-side winding and screen under each shielding construction design scheme are simulated using finite element analysis software Cover the structure capacitive data between layer；
(3) the structure capacitive data obtained according to above-mentioned emulation calculate being total under each shielding construction design scheme transformer Mould assesses equivalent capacity；
(4) the corresponding common mode assessment the smallest one group of shielding construction design scheme of equivalent capacity is taken, and according to this to Transformer shielding layer Structure is designed.
2. shielding construction design method according to claim 1, it is characterised in that: designing it to Transformer shielding layer Before, setting the length of shielded layer as its circumference, the thickness of shielded layer is then depending on the material thickness selected by its reality, therefore The two parameters are chosen to be constant in advance.
3. shielding construction design method according to claim 1, it is characterised in that: the transformer is radial successively from magnetic core Interlocked coiling by first layer primary side winding, first screen layer, vice-side winding, secondary shielding layer, second layer primary side winding.
4. shielding construction design method according to claim 3, it is characterised in that: every group of shielding construction design scheme wraps First screen layer and the respective width of secondary shielding layer are contained.
5. shielding construction design method according to claim 3, it is characterised in that: the inside transformer original vice-side winding Structure capacitive data between shielded layer include: structure capacitive between first layer primary side winding and first screen layer, first The structure capacitive between structure capacitive, second layer primary side winding and secondary shielding layer between layer primary side winding and vice-side winding, Structure capacitive, vice-side winding between second layer primary side winding and vice-side winding and the structure capacitive between first screen layer, pair Structure capacitive between side winding and secondary shielding layer.
6. shielding construction design method according to claim 3, it is characterised in that: for any screen in the step (3) Shield structure design scheme is calculated by the following formula the common mode assessment equivalent capacity of transformer under the design scheme；
Wherein: CkEquivalent capacity is assessed for the common mode of transformer, w is magnetic core window width, wsh1For the width of first screen layer, wsh2For the width of secondary shielding layer, h1For first screen layer bottom margin to the distance of bottom magnetic core framework, h2For secondary shielding Distance of the layer bottom margin to bottom magnetic core framework, NPFor the total number of turns of first layer primary side winding and second layer primary side winding, NSFor The number of turns of vice-side winding, NxFor the number of turns of first layer primary side winding, CpsFor the knot between first layer primary side winding and vice-side winding Structure capacitor, CqsStructure capacitive between second layer primary side winding and vice-side winding, CpshFor first layer primary side winding and the first shielding Structure capacitive between layer, CqshFor the structure capacitive between second layer primary side winding and secondary shielding layer, CspFor vice-side winding with Structure capacitive between first layer primary side winding, CsqFor the structure capacitive between vice-side winding and second layer primary side winding, NQ0With ND0It is constant.
7. shielding construction design method according to claim 6, it is characterised in that: the constant NQ0And ND0By with ShiShimonoseki It is that formula calculates determination:
Wherein: UQ0For the potential of primary side winding Same Name of Ends, UD0For the potential of vice-side winding Same Name of Ends, vPFor primary side winding both ends electricity The instantaneous value of pressure, vSFor the instantaneous value of vice-side winding both end voltage, t is the time.
8. shielding construction design method according to claim 3, it is characterised in that: the first screen layer and secondary shielding Layer is all made of gum copper foil, and copper foil width is depending on magnetic core window width.
CN201910542974.5A 2019-06-21 2019-06-21 Flyback sourse interlocks the shielding construction design method of winding transformer Pending CN110415957A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111312489A (en) * 2020-02-20 2020-06-19 连云港杰瑞电子有限公司 Transformer winding arrangement method and displacement current numerical analysis method thereof
CN112002536A (en) * 2020-08-24 2020-11-27 黑龙江大学 Low-distribution capacitance layout method for primary winding of high-frequency integrated transformer
CN112582160A (en) * 2020-12-31 2021-03-30 福州大学 Double-layer shielding structure for transformer and application thereof
CN113035550A (en) * 2021-03-04 2021-06-25 浙江大学 Design method for transformer shielding layer of isolated resonant converter

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Publication number Priority date Publication date Assignee Title
CN107610929A (en) * 2017-09-22 2018-01-19 浙江大学 The design method of inverse-excitation type switch power-supply Transformer shielding winding

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CN107610929A (en) * 2017-09-22 2018-01-19 浙江大学 The design method of inverse-excitation type switch power-supply Transformer shielding winding

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111312489A (en) * 2020-02-20 2020-06-19 连云港杰瑞电子有限公司 Transformer winding arrangement method and displacement current numerical analysis method thereof
CN111312489B (en) * 2020-02-20 2021-08-17 连云港杰瑞电子有限公司 Transformer winding arrangement method and displacement current numerical analysis method thereof
CN112002536A (en) * 2020-08-24 2020-11-27 黑龙江大学 Low-distribution capacitance layout method for primary winding of high-frequency integrated transformer
CN112002536B (en) * 2020-08-24 2024-02-27 黑龙江大学 Low-distributed capacitance layout method for primary winding of high-frequency integrated transformer
CN112582160A (en) * 2020-12-31 2021-03-30 福州大学 Double-layer shielding structure for transformer and application thereof
CN113035550A (en) * 2021-03-04 2021-06-25 浙江大学 Design method for transformer shielding layer of isolated resonant converter

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Application publication date: 20191105