CN108023475A - A kind of electromagnetic compatibility adjustment circuit of flat surface transformer - Google Patents
A kind of electromagnetic compatibility adjustment circuit of flat surface transformer Download PDFInfo
- Publication number
- CN108023475A CN108023475A CN201810021986.9A CN201810021986A CN108023475A CN 108023475 A CN108023475 A CN 108023475A CN 201810021986 A CN201810021986 A CN 201810021986A CN 108023475 A CN108023475 A CN 108023475A
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- China
- Prior art keywords
- electromagnetic compatibility
- flat surface
- surface transformer
- adjustment
- coil
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
A kind of electromagnetic compatibility adjustment circuit of flat surface transformer, applied to Switching Power Supply, split coil is adjusted including being arranged on the electromagnetic compatibility inside flat surface transformer, in it or outboard connection i.e. the first pin is connected to Switching Power Supply mainboard by lead, adjustment capacitance outside the first or second electromagnetic compatibility is further included, adjustment capacitance connection forms compensation loop in split coil or between outboard connection i.e. first or the ground terminal of the ancillary coil of second pin and flat surface transformer outside the first or second electromagnetic compatibility；Accordingly be connected the capacity of adjustment capacitance outside the first or second electromagnetic compatibility on circuit by adjusting first or second pin of split coil and adjustment with split coil, changes the polarity of split coil, make common mode current vector addition and equal to zero.The present invention is not changing inside flat surface transformer in the case of printed wiring board, can effectively optimize the Electro Magnetic Compatibility of Switching Power Supply, shortens EMC Design optimization time at least one moon of flat surface transformer.
Description
Technical field
The present invention relates to flat surface transformer, more particularly to a kind of electromagnetic compatibility adjustment circuit of flat surface transformer.
Background technology
Existing small-power switching power-supply is by adjusting the Electro Magnetic Compatibility of transformer coiling loop construction optimization power supply, plane
Transformer replaces the coiling of traditional transformer using printed wiring board, has the advantage that uniformity is good, processing cost is low, is switching
In power supply, fast-changing voltage can produce generation common mode current, and the electric current for flowing through ground wire is the sum of common mode current.It is in design
When setting common-mode voltage as some value, make to flow through ground wire common mode current minimum, the suppression common mode electromagnetic interference of generation is minimum.But
Its electromagnetic compatibility characteristic (common mode current) is fixed, it is impossible to adjusts, by varying cabling arrangement adjusting and optimizing inside printed wiring board
The design cycle of the Electro Magnetic Compatibility of power supply lengthens, and the general time for playing a sample is 1 month.
The content of the invention
A technical problem to be solved by this invention is the defects of making up the above-mentioned prior art, there is provided a kind of plane transformation
Device electromagnetic compatibility adjustment circuit.
Another technical problem to be solved by this invention is the defects of making up the above-mentioned prior art, there is provided another plane
Transformer electromagnetic compatibility adjustment circuit.
A kind of flat surface transformer electromagnetic compatibility adjustment circuit technical problem of the present invention is solved by the following technical programs
Certainly.
The electromagnetic compatibility adjustment circuit of this flat surface transformer, applied to Switching Power Supply, the Switching Power Supply includes primary
The flat surface transformer of main loop of power circuit, switching tube and control integrated circuit, the flat surface transformer include primary coil, secondary wire
Circle and ancillary coil.
The characteristics of electromagnetic compatibility adjustment circuit of this flat surface transformer is：
Split coil is adjusted including being arranged on the electromagnetic compatibility inside the flat surface transformer, the electromagnetic compatibility adjustment is opened
The inboard tie point of ring coil i.e. the first pin is connected to Switching Power Supply mainboard by lead, for producing and switch tube voltage pole
Property identical or opposite electromagnetic compatibility adjustment voltage；
Adjustment capacitance outside the first electromagnetic compatibility is further included, adjustment capacitance connection is in electromagnetism outside first electromagnetic compatibility
Group between the inboard tie point i.e. ground terminal of the ancillary coil of the first pin and flat surface transformer of compatibility adjustment split coil
Into compensation loop, for adjusting and the opposite polarity electromagnetic compatibility offset voltage of switch tube voltage；
Accordingly it is connected by adjusting inboard tie point i.e. the first pin and adjustment of split coil with split coil circuit
On the first electromagnetic compatibility outside adjustment capacitance capacity, change the polarity of split coil, make to include compensation loop, switching tube master
Circuit, the secondary coil of flat surface transformer export, and the common mode current vector addition including the electric current of ancillary coil output
With equal to zero, you can effectively optimization common-mode voltage Electro Magnetic Compatibility.
A kind of flat surface transformer electromagnetic compatibility adjustment circuit technical problem of the present invention passes through technical side further below
Case is solved.
Adjustment capacitance is the capacitance that capacity is 2.2pf~2.0nf outside first electromagnetic compatibility.
Another flat surface transformer electromagnetic compatibility adjustment circuit technical problem of the present invention gives by the following technical programs
Solve.
The electromagnetic compatibility adjustment circuit of this flat surface transformer, applied to Switching Power Supply, the Switching Power Supply includes primary
The flat surface transformer of main loop of power circuit, switching tube and control integrated circuit, the flat surface transformer include primary coil, secondary wire
Circle and ancillary coil.
The characteristics of electromagnetic compatibility adjustment circuit of this flat surface transformer is：
Split coil is adjusted including being arranged on the electromagnetic compatibility inside the flat surface transformer, the electromagnetic compatibility adjustment is opened
Outboard connection, that is, second pin of ring coil is connected to Switching Power Supply mainboard by lead, for producing and switch tube voltage pole
Property identical or opposite electromagnetic compatibility adjustment voltage；
Adjustment capacitance outside the second electromagnetic compatibility is further included, adjustment capacitance connection is in electromagnetism outside second electromagnetic compatibility
Group between the ground terminal of outboard connection, that is, second pin of compatibility adjustment split coil and the ancillary coil of flat surface transformer
Into compensation loop, for adjusting the electromagnetic compatibility offset voltage identical with switching tube polarity；
Accordingly it is connected by adjusting the outboard connection, that is, second pin and adjustment of split coil with split coil circuit
On the second electromagnetic compatibility outside adjustment capacitance capacity, change the polarity of split coil, make to include compensation loop, switching tube master
Circuit, the secondary coil of flat surface transformer export, and the common mode current vector addition including the electric current of ancillary coil output
With equal to zero, you can effectively optimization common-mode voltage Electro Magnetic Compatibility.
Another flat surface transformer electromagnetic compatibility adjustment circuit technical problem of the present invention passes through technical side further below
Case is solved
Adjustment capacitance is the capacitance that capacity is 2.2pf~2.0nf outside second electromagnetic compatibility.
Compared with the prior art, the invention has the advantages that：
The present invention is not changing inside flat surface transformer in the case of printed wiring board, can effectively optimize Switching Power Supply
Electro Magnetic Compatibility, shortens EMC Design optimization time at least one moon of flat surface transformer.
Brief description of the drawings
Fig. 1 is the switching power circuit figure using the specific embodiment of the invention one；
Fig. 2 is the switching power circuit figure using the specific embodiment of the invention two；
Fig. 3 is the electromagnetic compatibility adjustment split coil schematic diagram of the specific embodiment of the invention.
Embodiment
With reference to embodiment and compare attached drawing the present invention will be described.
Embodiment one
The electromagnetic compatibility adjustment circuit of a kind of flat surface transformer as shown in Figure 1,3, applied to Switching Power Supply, Switching Power Supply
Flat surface transformer M1, switch transistor T 2 and control Integrated circuit IC 1, flat surface transformer M1 including primary main loop of power circuit include end
The ancillary coil of sub 1,2 primary coil, the secondary coil of terminal 5,6 and terminal 3,4.
Present embodiment one includes being arranged on the electromagnetic compatibility adjustment split coil J1- inside flat surface transformer M1
J2, inboard tie point i.e. the first pin J1 of electromagnetic compatibility adjustment split coil J1-J2 are connected to Switching Power Supply master by lead
Plate, voltage is adjusted for producing the electromagnetic compatibility identical or opposite with 2 polarity of voltage of switch transistor T；
Further include and capacitance C1 is adjusted outside the first electromagnetic compatibility that capacity is 2.2pf~2.0nf, outside the first electromagnetic compatibility
Adjustment capacitance C1 is connected to inboard tie point i.e. the first pin J1 and the flat surface transformer of electromagnetic compatibility adjustment split coil J1-J2
Ancillary coil ground terminal 4 between form compensation loop, it is simultaneous for adjusting opposite with 2 polarity of voltage of switch transistor T electromagnetism
Hold offset voltage；
By adjusting split coil J1-J2 inboard tie point i.e. the first pin J1 and adjustment accordingly with split coil phase
The capacity for the first electromagnetic compatibility outside adjustment capacitance C1 being linked back on road, changes the polarity of split coil J1-J2, makes to include compensation
The secondary coil output of loop, switching tube major loop, flat surface transformer, and the common mode electricity including the electric current of ancillary coil output
Flow vector be added and equal to zero, you can effectively optimization common-mode voltage Electro Magnetic Compatibility.
Using the flat surface transformer of present embodiment one, the adjustable range of its Switching Power Supply common-mode voltage for-
1068mV~+408mV, the electromagnetic compatibility characteristic variations of respective switch power supply are more than 5dB (μ V).Do not use embodiment
One, it is necessary to design a variety of flat surface transformers, and the design cycle lengthens.
Embodiment two
The electromagnetic compatibility adjustment circuit of a kind of flat surface transformer as shown in Figure 1,3, applied to Switching Power Supply, Switching Power Supply
Flat surface transformer M1, switch transistor T 2 and control Integrated circuit IC 1, flat surface transformer M1 including primary main loop of power circuit include end
The ancillary coil of sub 1,2 primary coil, the secondary coil of terminal 5,6 and terminal 3,4.
Present embodiment two includes being arranged on the electromagnetic compatibility adjustment split coil J1- inside flat surface transformer M1
J2, outboard connection, that is, second pin J2 of electromagnetic compatibility adjustment split coil J1-J2 are connected to Switching Power Supply master by lead
Plate, voltage is adjusted for producing the electromagnetic compatibility identical or opposite with 2 polarity of voltage of switch transistor T；
Further include and capacitance C2 is adjusted outside the second electromagnetic compatibility that capacity is 2.2pf~2.0nf, outside the second electromagnetic compatibility
Adjustment capacitance C2 is connected to outboard connection i.e. second pin J2 and the flat surface transformer of electromagnetic compatibility adjustment split coil J1-J2
Ancillary coil ground terminal 4 between form compensation loop, it is simultaneous for adjusting opposite with 2 polarity of voltage of switch transistor T electromagnetism
Hold offset voltage；
By adjusting split coil J1-J2 outboard connection, that is, second pin J2 and adjustment accordingly with split coil phase
The capacity for the second electromagnetic compatibility outside adjustment capacitance C2 being linked back on road, changes the polarity of split coil J1-J2, makes to include compensation
The secondary coil output of loop, switching tube major loop, flat surface transformer, and the common mode electricity including the electric current of ancillary coil output
Flow vector be added and equal to zero, you can effectively optimization common-mode voltage Electro Magnetic Compatibility.
Using the flat surface transformer of present embodiment two, the adjustable range of its Switching Power Supply common-mode voltage for+
710mV~+1100mV, the electromagnetic compatibility characteristic variations of respective switch power supply are more than 5dB (μ V).Do not use embodiment
Two, it is necessary to design a variety of flat surface transformers, and the design cycle lengthens.
Above content is that a further detailed description of the present invention in conjunction with specific preferred embodiments, it is impossible to is assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
Some equivalent substitutes or obvious modification are made on the premise of not departing from present inventive concept, and performance or purposes are identical, all should
It is considered as belonging to the scope of patent protection that the present invention is determined by the claims submitted.
Claims (4)
1. a kind of electromagnetic compatibility adjustment circuit of flat surface transformer, applied to Switching Power Supply, the Switching Power Supply includes primary main
The flat surface transformer of loop of power circuit, switching tube and control integrated circuit, the flat surface transformer include primary coil, secondary coil
And ancillary coil, it is characterised in that：
Split coil is adjusted including being arranged on the electromagnetic compatibility inside the flat surface transformer, the electromagnetic compatibility adjusts open loop line
The inboard tie point of circle i.e. the first pin is connected to Switching Power Supply mainboard by lead, for producing and switch tube voltage polarity phase
Same or opposite electromagnetic compatibility adjustment voltage；
Adjustment capacitance outside the first electromagnetic compatibility is further included, adjustment capacitance connection is in electromagnetic compatibility outside first electromagnetic compatibility
Composition is mended between adjusting the inboard tie point i.e. ground terminal of the ancillary coil of the first pin and flat surface transformer of split coil
Loop is repaid, for adjusting and the opposite polarity electromagnetic compatibility offset voltage of switch tube voltage；
Accordingly it is connected by adjusting inboard tie point i.e. the first pin and adjustment of split coil with split coil on circuit
The capacity of adjustment capacitance outside first electromagnetic compatibility, changes the polarity of split coil, makes to include compensation loop, switching tube master time
Road, the secondary coil output of flat surface transformer, and the sum of the common mode current vector addition including the electric current of ancillary coil output
Equal to zero, you can the effectively Electro Magnetic Compatibility of optimization common-mode voltage.
2. the electromagnetic compatibility adjustment circuit of flat surface transformer as claimed in claim 1, it is characterised in that：
Adjustment capacitance is the capacitance that capacity is 2.2pf~2.0nf outside first electromagnetic compatibility.
3. a kind of electromagnetic compatibility adjustment circuit of flat surface transformer, applied to Switching Power Supply, the Switching Power Supply includes primary main
The flat surface transformer of loop of power circuit, switching tube and control integrated circuit, the flat surface transformer include primary coil, secondary coil
And ancillary coil, it is characterised in that：
Split coil is adjusted including being arranged on the electromagnetic compatibility inside the flat surface transformer, the electromagnetic compatibility adjusts open loop line
Outboard connection, that is, second pin of circle is connected to Switching Power Supply mainboard by lead, for producing and switch tube voltage polarity phase
Same or opposite electromagnetic compatibility adjustment voltage；
Adjustment capacitance outside the second electromagnetic compatibility is further included, adjustment capacitance connection is in electromagnetic compatibility outside second electromagnetic compatibility
Composition is mended between adjusting the ground terminal of outboard connection, that is, second pin of split coil and the ancillary coil of flat surface transformer
Loop is repaid, for adjusting the electromagnetic compatibility offset voltage identical with switching tube polarity；
Accordingly it is connected by adjusting the outboard connection, that is, second pin and adjustment of split coil with split coil on circuit
The capacity of adjustment capacitance outside second electromagnetic compatibility, changes the polarity of split coil, makes to include compensation loop, switching tube master time
Road, the secondary coil output of flat surface transformer, and the sum of the common mode current vector addition including the electric current of ancillary coil output
Equal to zero, you can the effectively Electro Magnetic Compatibility of optimization common-mode voltage.
4. the electromagnetic compatibility adjustment circuit of flat surface transformer as claimed in claim 3, it is characterised in that：
Adjustment capacitance is the capacitance that capacity is 2.2pf~2.0nf outside second electromagnetic compatibility.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810021986.9A CN108023475A (en) | 2018-01-10 | 2018-01-10 | A kind of electromagnetic compatibility adjustment circuit of flat surface transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810021986.9A CN108023475A (en) | 2018-01-10 | 2018-01-10 | A kind of electromagnetic compatibility adjustment circuit of flat surface transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108023475A true CN108023475A (en) | 2018-05-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810021986.9A Pending CN108023475A (en) | 2018-01-10 | 2018-01-10 | A kind of electromagnetic compatibility adjustment circuit of flat surface transformer |
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| Country | Link |
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| CN (1) | CN108023475A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6005355A (en) * | 1996-12-27 | 1999-12-21 | Susan Siao | Electronic ballast system for fluorescent lamps |
| US20100202160A1 (en) * | 2009-02-12 | 2010-08-12 | Samsung Electro-Mechanics Co., Ltd. | Power converter transformer for suppressing conduction emi and power supply having its transformer |
| KR20130005103A (en) * | 2011-07-05 | 2013-01-15 | 박찬웅 | Method and apparatus for reducing radiated emi of switching power supply |
| CN103065773A (en) * | 2011-10-24 | 2013-04-24 | 中国科学院微电子研究所 | Low-noise switching mode power supply transformer and low-noise switching power supply |
| CN103117655A (en) * | 2011-11-16 | 2013-05-22 | 艾沃特有限公司 | Emi frequency spreading method for switching power converter |
| US20170005525A1 (en) * | 2014-01-22 | 2017-01-05 | Powerbyproxi Limited | Coupled-coil power control for inductive power transfer systems |
| 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 |
| CN107482918A (en) * | 2016-12-23 | 2017-12-15 | 中南大学 | A kind of electric power electric transformer based on plate condenser |
| KR20180002363A (en) * | 2016-06-29 | 2018-01-08 | 이주열 | Snubber Circuit Integrated Planar Transformer |
| CN207884489U (en) * | 2018-01-10 | 2018-09-18 | 赛尔康技术（深圳）有限公司 | A kind of electromagnetic compatibility adjustment circuit of flat surface transformer |
-
2018
- 2018-01-10 CN CN201810021986.9A patent/CN108023475A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6005355A (en) * | 1996-12-27 | 1999-12-21 | Susan Siao | Electronic ballast system for fluorescent lamps |
| US20100202160A1 (en) * | 2009-02-12 | 2010-08-12 | Samsung Electro-Mechanics Co., Ltd. | Power converter transformer for suppressing conduction emi and power supply having its transformer |
| KR20130005103A (en) * | 2011-07-05 | 2013-01-15 | 박찬웅 | Method and apparatus for reducing radiated emi of switching power supply |
| CN103065773A (en) * | 2011-10-24 | 2013-04-24 | 中国科学院微电子研究所 | Low-noise switching mode power supply transformer and low-noise switching power supply |
| CN103117655A (en) * | 2011-11-16 | 2013-05-22 | 艾沃特有限公司 | Emi frequency spreading method for switching power converter |
| US20170005525A1 (en) * | 2014-01-22 | 2017-01-05 | Powerbyproxi Limited | Coupled-coil power control for inductive power transfer systems |
| KR20180002363A (en) * | 2016-06-29 | 2018-01-08 | 이주열 | Snubber Circuit Integrated Planar Transformer |
| 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 |
| CN107482918A (en) * | 2016-12-23 | 2017-12-15 | 中南大学 | A kind of electric power electric transformer based on plate condenser |
| CN207884489U (en) * | 2018-01-10 | 2018-09-18 | 赛尔康技术（深圳）有限公司 | A kind of electromagnetic compatibility adjustment circuit of flat surface transformer |
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