CN105743338A - Electromagnetic loss based common-mode interference suppressor of switching power supply - Google Patents

Electromagnetic loss based common-mode interference suppressor of switching power supply Download PDF

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Publication number
CN105743338A
CN105743338A CN201610179852.0A CN201610179852A CN105743338A CN 105743338 A CN105743338 A CN 105743338A CN 201610179852 A CN201610179852 A CN 201610179852A CN 105743338 A CN105743338 A CN 105743338A
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CN
China
Prior art keywords
power supply
suppressor
common mode
switching power
common
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610179852.0A
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Chinese (zh)
Inventor
陈将伟
杨晓霞
宦杰
陶志阔
谢国治
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Nanjing Post and Telecommunication University
Nanjing University of Posts and Telecommunications
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Nanjing Post and Telecommunication University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Nanjing Post and Telecommunication University filed Critical Nanjing Post and Telecommunication University
Priority to CN201610179852.0A priority Critical patent/CN105743338A/en
Publication of CN105743338A publication Critical patent/CN105743338A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • H02M1/123—Suppression of common mode voltage or current

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

The invention discloses an electromagnetic loss based common-mode interference suppressor of a switching power supply. A suppressor circuit adopts a ladder-type network form of a lumped element, and a unit structure is a low-pass circuit formed by connecting an inductor coil in series and a capacitor in parallel; with regard to cable-ground conducted common-mode current in a 5-500MHz frequency range and with consideration of the length Pu of the unit structure far smaller than the wavelength of the common-mode current and the convenience of circuit fabrication, the Pu is about equal to 1 centimeter, the inductor coil is filled with a composite magnetic material of which the magnetic conductivities of a real part and a virtual part are over 10 orders of magnitude and which takes ferrite as a main constituent, and the capacitor is filled with a composite dielectric material of which the dielectric constants of a real part and a virtual part are over 10 orders of magnitude; and the common-mode interference suppressor is connected in series to a cable of the switching power supply, the suppressor has relatively large attenuation coefficient, thus, the common-mode current is rapidly attenuated in an index form, and the common-mode current in a subsequent circuit is strongly suppressed. The electromagnetic loss based common-mode interference suppressor is simple in structure, and can be conveniently used for fabricating the switching power supply with low electromagnetic interference and improving the electromagnetic compatibility of the existing power supply.

Description

Switching Power Supply common mode disturbances suppressor based on electromagnetic consumable
Technical field
The present invention relates to field of electromagnetic compatibility, be specifically related to a kind of Switching Power Supply common mode disturbances suppressor based on electromagnetic consumable.
Background technology
Switching Power Supply has the advantages such as volume is little, efficiency is high, output stability is good, has been widely used.But switch Power supply is easily generated common mode current, causes serious Conduction Interference and radiation interference.Solve common mode disturbances, it has also become switch electricity The key issue that source designer faces.
The switching device of Switching Power Supply, nonlinear passive element etc. can become common mode disturbances source, past between each device (first) part Toward there is also influencing each other of complexity.Generally, the methods such as uptake pathway, series inductance, ground connection and shielding are comprehensively taked Suppression common mode disturbances.Along with Switching Power Supply power density and the raising of switching frequency, designer has to make great efforts to improve and complete The kind method pressing down common mode current common mode disturbances, makes the design of Switching Power Supply and preparation become to become increasingly complex.Seek efficiently Easy common mode disturbances suppressing method seems and becomes more and more important.
It is known that output cable-the earth is the passage of conduction common mode current, it also it is the main place producing common mode radiation. Magnetic bead, common mode choke etc. is generally used to suppress the common mode current in cable, but often can only be to the common mode of component frequency Electric current effectively suppresses, and inhibition is relevant with the position that magnetic bead, common mode choke are placed.
Electromagnetic consumable material (absorbing material) has become one of jamproof common used material of radioprotective.Utilize electromagnetic consumable material Material absorbs the interference electromagnetic wave that electronic and electrical equipment produces, and does not has the roundtrip of electromagnetic wave in making shielding cavity, builds nothing The space of reflection of electromagnetic wave, can thoroughly prevent the radiation of electromagnetic wave, eliminates electromagnetic pollution, improves the anti-electromagnetism of equipment simultaneously Interference performance.On the other hand, conventional electromagnetic consumable material, such as Ni-Zn based ferrite, can be 105～8The frequency model of Hz There is higher loss in enclosing, can effectively suppress the electromagnetic interference of wider frequency range.
The present invention is directed to the common mode current in switched power output cable, electricity, magnetic loss material be attached in circuit, The common mode current of the wider frequency that effectively decays segment limit, with the suppression common mode disturbances of Switching Power Supply.
Summary of the invention
It is an object of the invention to overcome the deficiency of existing correlation technique, for preparing the Switching Power Supply of low EMI, improvement The Electro Magnetic Compatibility of existing power supply is provided that simple effective way.
Switching Power Supply common mode disturbances suppressor based on electromagnetic consumable include twoport current input terminal, twoport current output terminal, Fill the inductance coil L of magnetic loss material, fill the capacitor C of electrically lossy material.Series inductance L and shunt capacitance The low pass circuit that device C is constituted is to build the cellular construction of lamped element ladder network, as shown in Figure 1.For Switching Power Supply Middle along cable-the earth conduction, the common mode current of 5-500MHz frequency range, it is contemplated that cellular construction length PuIt is much smaller than Common mode current wavelength and the situation of preparation, take Pu≈ 1cm, fills pcrmeability real part, imaginary part all in 10 magnitudes in inductance coil The composite with ferrite as main component, in capacitor fill real part of permittivity, imaginary part all answering in 10 magnitudes Close dielectric material.8-10 cellular construction series connection, form common mode disturbances suppressor.By twoport current input terminal and defeated Go out end, common mode disturbances suppressor is connected in series on the cable of Switching Power Supply, utilize bigger the declining that stream suppressor circuit has Subtract coefficient, make common mode current decay rapidly with exponential form, reach to suppress the purpose of common mode current in subsequent conditioning circuit.
In inductance coil, the pcrmeability real part of magnetic composite of filling, imaginary part are all in 10 magnitudes.
In capacitor, the dielectric composite material real part of permittivity of filling, imaginary part are all in 10 magnitudes.
Cellular construction length Pu≈1cm。
The length of the ladder network of the lamped element formed by cellular construction series connection can be adjusted according to actual needs.
Beneficial effect
Present configuration is simple, can be advantageously used in the preparation of the Switching Power Supply of low EMI, improve the electromagnetism of existing power supply Compatible performance.
Accompanying drawing explanation
Fig. 1 (a) is the cellular construction schematic diagram of the present invention.
Fig. 1 (b) is the common mode disturbances suppressor sample prepared with lamped element ladder network form of the present invention.
It is serially connected on laptop output cable during Fig. 1 (c) application.
Fig. 2 (a) current probe (CP8030H) measures the common mode current of power output end and common mode noise killer sample room.
Fig. 2 (b) and 2 (c) current probe are in the two times result of position measurement shown in Fig. 2 (a).
Fig. 3 (a) current probe (CP8030H) measures the common mode current in the common mode disturbances follow-up cable of suppressor sample.
Fig. 3 (b) and 3 (c) current probe are in the two times result of position measurement shown in Fig. 3 (a).
Fig. 4 (a) is 125MHz common mode current numerical simulation result of 1.2 meters of long cable distribution along Switching Power Supply.
Fig. 4 (b) is that after power output end concatenates 8 centimeter length common mode disturbances suppressor, 125MHz common mode current is along 1.2 meters of long electricity The numerical simulation result of cable distribution.
Detailed description of the invention
As it is shown in figure 1, Fig. 1 (a) is the cellular construction schematic diagram of the present invention.L is inductance coil, and C is capacitor, shadow Magnetic loss material and electrically lossy material it is filled with respectively in representing two devices.Fig. 1 (b) is the trapezoidal with lamped element of the present invention Common mode disturbances suppressor sample prepared by latticed form.Inductance overall length 8cm, the inside is wrapped with ferrite bar as magnetic loss material. Draw wire every 1 centimetre from inductance to be connected with capacitor.Capacitor plates area is 1 square centimeter, inside fills out hydroxyl Ferrum is as electrically lossy material.During Fig. 1 (c) application, sample is serially connected on laptop output cable.
Case study on implementation 1:
Respectively current probe is placed in position shown in Fig. 2 (a) and Fig. 3 (a), measures common mode current.In view of measuring knot The random character of fruit, we embody inhibition by repetitive measurement, typical consequence such as Fig. 2 (b), 2 (c), 3 (b) With 3 (c) Suo Shi.Visible, rms voltage that common mode current between power output end with common mode noise killer is corresponding (see Fig. 2 (b) and 2 (c) lower left side) root-mean-square that common mode current in generally follow-up than common mode disturbances suppressor cable is corresponding Voltage (see Fig. 3 (b) and 3 (c) lower left side) is big, shows that sample serves suppression and makees common mode current in follow-up cable With.Due to limited conditions, we fail to select suitable electromagnetic consumable material on request, have impact on inhibition.
Embodiment 2:
For embodying good inhibition, it will be assumed that the pcrmeability real part of the magnetic composite filled in inductance coil, Imaginary part is all in 10 magnitudes, and the dielectric composite material real part of permittivity of capacitor filling, imaginary part are all in 10 magnitudes.Suppression Numerical simulation result front and back is as shown in Figure 4.Fig. 4 (a) 125MHz common mode current 1.2 meters of long cables along Switching Power Supply Distribution situation；Fig. 4 (b) after power output end concatenates 8 centimeter length common mode disturbances suppressor, 125MHz common mode current Current intensity along the distribution situation of 1.2 meters of long cables.Visible, if selected for suitable electromagnetic consumable material, common mode Electric current will be significantly suppressed.

Claims (5)

1. a Switching Power Supply common mode disturbances suppressor based on electromagnetic consumable, it is characterised in that:
Including twoport current input terminal, twoport current output terminal, fill the inductance coil (L) of magnetic loss material, filling electricity The cellular construction of the low pass circuit that the capacitor (C) of loss material is constituted, 8-10 cellular construction series connection, is formed altogether Mould noise killer；By twoport current input terminal and twoport current output terminal, common mode disturbances suppressor is connected in series to switch electricity On the cable in source.
Switching Power Supply common mode disturbances suppressor the most according to claim 1, it is characterised in that in inductance coil (L) The pcrmeability real part of the composite with ferrite as main component of filling, imaginary part are all in 10 magnitudes.
Switching Power Supply common mode disturbances suppressor the most according to claim 2, it is characterised in that capacitor (C) is filled Dielectric composite material real part of permittivity, imaginary part is all in 10 magnitudes.
Switching Power Supply common mode disturbances suppressor the most according to claim 3, it is characterised in that cellular construction length Pu≈1cm。
Switching Power Supply common mode disturbances suppressor the most according to claim 4, it is characterised in that connected by cellular construction The length of the ladder network of the lamped element formed can be adjusted according to actual needs.
CN201610179852.0A 2016-03-25 2016-03-25 Electromagnetic loss based common-mode interference suppressor of switching power supply Pending CN105743338A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610179852.0A CN105743338A (en) 2016-03-25 2016-03-25 Electromagnetic loss based common-mode interference suppressor of switching power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610179852.0A CN105743338A (en) 2016-03-25 2016-03-25 Electromagnetic loss based common-mode interference suppressor of switching power supply

Publications (1)

Publication Number Publication Date
CN105743338A true CN105743338A (en) 2016-07-06

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5969583A (en) * 1996-12-23 1999-10-19 Acuson Corporation Common-mode EMI filter with a separately wound ground winding
CN1764066A (en) * 2005-09-21 2006-04-26 东南大学 Electromagnetic interference eliminator for power system automation apparatus
CN202077249U (en) * 2011-03-18 2011-12-14 杭州电子科技大学 Electromagnetic interference preventing and protecting device
CN104319751A (en) * 2014-10-09 2015-01-28 南京邮电大学 Electromagnetic loss-based electric vehicle common mode current suppressor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5969583A (en) * 1996-12-23 1999-10-19 Acuson Corporation Common-mode EMI filter with a separately wound ground winding
CN1764066A (en) * 2005-09-21 2006-04-26 东南大学 Electromagnetic interference eliminator for power system automation apparatus
CN202077249U (en) * 2011-03-18 2011-12-14 杭州电子科技大学 Electromagnetic interference preventing and protecting device
CN104319751A (en) * 2014-10-09 2015-01-28 南京邮电大学 Electromagnetic loss-based electric vehicle common mode current suppressor

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Application publication date: 20160706