CN103595047A - A potent power supply filter - Google Patents
A potent power supply filter Download PDFInfo
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- CN103595047A CN103595047A CN201210286149.1A CN201210286149A CN103595047A CN 103595047 A CN103595047 A CN 103595047A CN 201210286149 A CN201210286149 A CN 201210286149A CN 103595047 A CN103595047 A CN 103595047A
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- differential mode
- circuit
- capacitor
- mode
- power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a potent power supply filter comprising a power supply port, a load port, a common-mode circuit, a differential mode circuit and two RC filter circuits. The common-mode circuit comprises a filtering choke coil LC, a common-mode capacitor CY1 and a common-mode capacitor CY2. The differential mode circuit comprises a differential mode capacitor CX1, a differential mode capacitor CX2, and a differential mode choke coil LD. The beneficial effect of the potent power supply filter of the present invention is that: through the addition of the differential mode choke coil, the effect of suppressing differential mode noises is improved.
Description
Technical field
The present invention relates to the filter that the various EMI noises in power supply are filtered, particularly relate to a kind of potent power-supply filter.
Background technology
Along with the develop rapidly of modern science and technology, electronics, power electronics, electric equipment application are more and more extensive, and their be in operation high density producing, the electromagnetic signal of wide spectrum are full of whole space, form complicated electromagnetic environment.Complicated electromagnetic environment requirements electronic equipment and power supply have higher Electro Magnetic Compatibility.So suppressing the technology of electromagnetic interference also more and more comes into one's own.Ground connection, shielding and filtering are the three large measures that suppress electromagnetic interference, below the electromagnetic interface filter that uses in power supply of article and basic principle thereof and correct application process.
The power supply of electronic equipment, as 220V/50Hz AC network or 115V/400Hz alternating current generator, all there is EMI noise miscellaneous, artificial EMI interference source wherein, as the radio transmission signal of the equipment such as various radars, navigation, communication, can on power line and on the stube cable of electronic equipment, induce electromagnetic interference signal, electric rotary machine and ignition system can produce transient process and radiated noise and disturb in perceptual load circuit; Also have natural disturbance source, such as atmospherics noise in thunder discharge phenomenon and universe, the former duration is short but energy is very large, and the latter's frequency range is very wide.When electronic circuit components and parts itself are worked in addition, also can produce thermal noise etc.
These electromagnetic interference noises, the mode by radiation and conduction coupling, can affect the normal operation of the various electronic equipments that move in this environment.
On the other hand, electronic equipment also can produce various electromagnetic interference noises when work.Such as digital circuit is to adopt pulse signal (square wave) to carry out presentation logic relation, its impulse waveform is carried out to fourier analysis known, its harmonic spectrum scope is very wide.In digital circuit, also have in addition the pulse train of multiple repetition rate, the harmonic wave that these pulse trains comprise is abundanter, and frequency spectrum is wider, and the electromagnetic interference noise of generation is also more complicated.
All kinds of stabilized voltage power supplys itself are also a kind of electromagnetic interference sources.In linear stabilized power supply, the unidirectional pulsating current forming because of rectification also can cause electromagnetic interference; It is little that Switching Power Supply has volume, the advantage that efficiency is high, and in modern electronic equipment, application is more and more extensive, but because it when power conversion on off state, itself be exactly very strong EMI noise source, the existing very wide frequency range of EMI noise of its generation, has again very high intensity.These electromagnetic interference noises pollute electromagnetic environment by the mode of radiation and conduction too, thereby affect the normal operation of other electronic equipment.
Concerning electronic equipment, when analog circuit is arrived in EMI noise effect, can make the signal to noise ratio of signal transmission degenerate, when serious, can make the signal that will transmit be flooded by EMI noise, and cannot process.When EMI noise effect is when the digital circuit, can cause that logical relation makes mistakes, the result leading to errors.
For power-supply device, its inside, except power conversion circuit, also has drive circuit, control circuit, protective circuit, output and input level testing circuit etc., circuit very complex.These main circuits will consist of universal or special integrated circuit, while there is misoperation when being subject to electromagnetic interference, can make power supply quit work, and cause electronic equipment to work.Adopt electric network noise filter can effectively prevent that power supply from producing misoperation because of external electromagnetic noise interference.
In addition, the EMI noise entering from power input, its part can appear at the output of power supply, and it can produce induced voltage in the load circuit of power supply, becomes the reason that circuit produces signal transmission in misoperation or interfered circuit.These problems equally also available noise filter are prevented.
Existing power-supply filter, filter effect is not fine, is particularly suppressing, on differential mode noise, to seem very undesirable.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, potent power-supply filter is provided, solve the prior art shortcoming poor to differential mode noise inhibition.
Object of the present invention is achieved through the following technical solutions: potent power-supply filter, comprise power port, load port, common-mode circuit, differential mode circuit and two RC filter circuits, and described common-mode circuit comprises smoothing choke LC and common mode capacitance C
y1, C
y2, differential mode circuit comprises differential mode capacitor C
x1, C
x2with differential mode choke coil LD, the input of smoothing choke LC connects power port, and the input of differential mode choke coil LD is connected on the output of smoothing choke LC, differential mode capacitor C
x1and be connected in the input of smoothing choke LC, differential mode capacitor C
x2and be connected in the output of differential mode choke coil LD, described common mode capacitance C
y1, C
y2after ground connection, be connected on the positive and negative terminal of load port, after two RC filter circuit series connection, be connected in parallel on differential mode capacitor C
x2two ends.
Described load port place is also provided with the anti-voltage circuit of surging.
The described anti-voltage circuit of surging comprises electronic switch K
1with storage capacitor C
1.
Described differential mode capacitor C
x1or differential mode capacitor C
x2on be parallel with a discharge resistance R
1.
The invention has the beneficial effects as follows: increased differential mode choke coil and RC low pass filter, improved the effect that suppresses differential mode noise.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but structure of the present invention is not limited only to following examples:
[embodiment]
As shown in Figure 1, potent power-supply filter, comprises power port, load port, common-mode circuit, differential mode circuit and two RC filter circuits, and described common-mode circuit comprises smoothing choke LC and common mode capacitance C
y1, C
y2, differential mode circuit comprises differential mode capacitor C
x1, C
x2with differential mode choke coil LD, the input of smoothing choke LC connects power port, and the input of differential mode choke coil LD is connected on the output of smoothing choke LC, differential mode capacitor C
x1and be connected in the input of smoothing choke LC, differential mode capacitor C
x2and be connected in the output of differential mode choke coil LD, described common mode capacitance C
y1, C
y2after ground connection, be connected on the positive and negative terminal of load port, after two RC filter circuit series connection, be connected in parallel on differential mode capacitor C
x2two ends.
Described load port place is also provided with the anti-voltage circuit of surging.
The described anti-voltage circuit of surging comprises electronic switch K
1with storage capacitor C
1, electronic switch K
1be serially connected on the anode of load port storage capacitor C
1two ends connect respectively the positive and negative terminal of load port.Can avoid circuit be subject to the surging impact of voltage.
Described differential mode capacitor C
x1or differential mode capacitor C
x2on be parallel with a discharge resistance R
1.
Two RC filter circuits are respectively R in parallel
2, C
2and R in parallel
3, C
3, after these two filter circuit series connection, circuit is entered in parallel connection, plays the effect of low pass filter.
Claims (4)
1. potent power-supply filter, is characterized in that, comprises power port, load port, common-mode circuit, differential mode circuit and two RC filter circuits, and described common-mode circuit comprises smoothing choke LC and common mode capacitance C
y1, C
y2, differential mode circuit comprises differential mode capacitor C
x1, C
x2with differential mode choke coil LD, the input of smoothing choke LC connects power port, and the input of differential mode choke coil LD is connected on the output of smoothing choke LC, differential mode capacitor C
x1and be connected in the input of smoothing choke LC, differential mode capacitor C
x2and be connected in the output of differential mode choke coil LD, described common mode capacitance C
y1, C
y2after ground connection, be connected on the positive and negative terminal of load port, after two RC filter circuit series connection, be connected in parallel on differential mode capacitor C
x2two ends.
2. potent power-supply filter according to claim 1, is characterized in that, described load port place is also provided with the anti-voltage circuit of surging.
3. potent power-supply filter according to claim 2, is characterized in that, the described anti-voltage circuit of surging comprises electronic switch K
1with storage capacitor C
1.
4. according to arbitrary described potent power-supply filter in claim 1～3, it is characterized in that described differential mode capacitor C
x1or differential mode capacitor C
x2on be parallel with a discharge resistance R
1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210286149.1A CN103595047A (en) | 2012-08-13 | 2012-08-13 | A potent power supply filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210286149.1A CN103595047A (en) | 2012-08-13 | 2012-08-13 | A potent power supply filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103595047A true CN103595047A (en) | 2014-02-19 |
Family
ID=50085082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210286149.1A Pending CN103595047A (en) | 2012-08-13 | 2012-08-13 | A potent power supply filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103595047A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512435A (en) * | 2018-07-03 | 2018-09-07 | 合肥美菱股份有限公司 | A kind of frequency converter that refrigerator uses |
| CN109946559A (en) * | 2017-12-21 | 2019-06-28 | 成都长城开发科技有限公司 | Three-phase and four-line ammeter and its fall zero curve detection circuit |
| CN113655487A (en) * | 2021-09-16 | 2021-11-16 | 中国电子科技集团公司第四十四研究所 | Front-end device for continuous field-of-view laser short-range detection |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6040969A (en) * | 1998-08-04 | 2000-03-21 | Electronic Systems Protection, Inc. | Power filter circuit responsive to supply system fault conditions |
| CN2798396Y (en) * | 2005-03-11 | 2006-07-19 | 周熙文 | Antic interference emergency electric source |
| CN202696153U (en) * | 2012-08-13 | 2013-01-23 | 成都思迈科技发展有限责任公司 | Potent power supply filter |
-
2012
- 2012-08-13 CN CN201210286149.1A patent/CN103595047A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6040969A (en) * | 1998-08-04 | 2000-03-21 | Electronic Systems Protection, Inc. | Power filter circuit responsive to supply system fault conditions |
| CN2798396Y (en) * | 2005-03-11 | 2006-07-19 | 周熙文 | Antic interference emergency electric source |
| CN202696153U (en) * | 2012-08-13 | 2013-01-23 | 成都思迈科技发展有限责任公司 | Potent power supply filter |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946559A (en) * | 2017-12-21 | 2019-06-28 | 成都长城开发科技有限公司 | Three-phase and four-line ammeter and its fall zero curve detection circuit |
| CN108512435A (en) * | 2018-07-03 | 2018-09-07 | 合肥美菱股份有限公司 | A kind of frequency converter that refrigerator uses |
| CN113655487A (en) * | 2021-09-16 | 2021-11-16 | 中国电子科技集团公司第四十四研究所 | Front-end device for continuous field-of-view laser short-range detection |
| CN113655487B (en) * | 2021-09-16 | 2024-08-13 | 中国电子科技集团公司第四十四研究所 | Continuous field laser short-range detection front-end device |
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| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140219 |