CN202696153U - Potent power supply filter - Google Patents
Potent power supply filter Download PDFInfo
- Publication number
- CN202696153U CN202696153U CN2012203984691U CN201220398469U CN202696153U CN 202696153 U CN202696153 U CN 202696153U CN 2012203984691 U CN2012203984691 U CN 2012203984691U CN 201220398469 U CN201220398469 U CN 201220398469U CN 202696153 U CN202696153 U CN 202696153U
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- CN
- China
- Prior art keywords
- differential mode
- circuit
- mode
- differential
- capacitor
- 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.)
- Expired - Fee Related
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Classifications
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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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- Filters And Equalizers (AREA)
- Power Conversion In General (AREA)
Abstract
The utility model discloses a potent power supply filter, which comprises a power supply port, a load port, a common-mode circuit, a differential-mode circuit, and two RC filtering circuits. The common-mode circuit comprises a filtering chock coil LC and common-mode capacitors CY1 and CY2, and the differential-mode circuit comprises differential-mode capacitors CX1 and CX2 and a differential-mode chock coil LD. The potent power supply filter has the advantage that the differential-mode chock coil is added, thereby improving the effects of inhibiting differential-mode noises.
Description
Technical field
The utility model relates to the filter that the various EMI noises in the power supply are filtered, and particularly relates 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 are used more and more extensive, and their be in operation high density that produces, 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 in power supply, uses of article and basic principle thereof and correct application process.
The power supply of electronic equipment, such as 220V/50Hz AC network or 115V/400Hz alternating current generator, all there is EMI noise miscellaneous, artificial EMI interference source wherein, radio transmission signal such as equipment such as various radars, navigation, communications, can be on power line and the stube cable of electronic equipment induce electromagnetic interference signal, electric rotary machine and ignition system can produce transient process in perceptual load circuit and radiated noise disturbs; Also have the natural disturbance source, such as atmospherics noise in thunder discharge phenomenon and the universe, the former duration is short but energy is very large, and the latter's frequency range is very wide.Also can produce thermal noise etc. when electronic circuit components and parts itself are worked in addition.
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.Be to adopt pulse signal (square wave) to come the presentation logic relation such as digital circuit, its impulse waveform is carried out fourier analysis as can be known, its harmonic spectrum scope is very wide.Also have in addition the pulse train of multiple repetition rate in digital circuit, 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 also are a kind of electromagnetic interference sources.In linear stabilized power supply, the unidirectional pulsating current that forms because of rectification also can cause electromagnetic interference; It is little that Switching Power Supply has a volume, and the advantage that efficient is high is used more and more extensive in modern electronic equipment, but because it is on off state when power conversion, itself be exactly very strong EMI noise source, the existing very wide frequency range of the 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 the EMI noise effect, the signal to noise ratio of signal transmission is degenerated, when serious the signal that will transmit is flooded by the EMI noise, and can't process.When the EMI noise effect when the digital circuit, can cause that logical relation makes mistakes the result who leads to errors.
For power-supply device, its inside also has drive circuit, control circuit, protective circuit, output and input level testing circuit etc., the circuit very complex except power conversion circuit.These main circuits will be made of universal or special integrated circuit, when when being subjected to electromagnetic interference misoperation occuring, power supply are quit work, and cause electronic equipment to work.Adopt the electric network noise filter can prevent effectively that power supply from producing misoperation because of external electromagnetic noise interference.
In addition, from the EMI noise that power input enters, its part can appear at the output of power supply, and it can produce induced voltage in the load circuit of power supply, become the reason that circuit produces signal transmission in misoperation or the interfered circuit.These problems equally also available noise filter are prevented.
Existing power-supply filter, filter effect are not fine, are particularly suppressing to seem very undesirable on the differential mode noise.
The utility model content
The purpose of this utility model is to overcome the shortcoming and defect of above-mentioned prior art, and potent power-supply filter is provided, and solves the prior art shortcoming poor to the differential mode noise inhibition.
The purpose of this utility model 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, the 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
Y2Be connected to after the ground connection on the positive and negative terminal of load port, be connected in parallel on differential mode capacitor C after two RC filter circuit series connection
X2Two ends.
Described load port place also is 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 beneficial effects of the utility model are: increased differential mode choke coil and RC low pass filter, improved the effect that suppresses differential mode noise.
Description of drawings
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with embodiment, but structure of the present utility model is not limited only to following examples:
[embodiment]
Such as Fig. 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, the 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
Y2Be connected to after the ground connection on the positive and negative terminal of load port, be connected in parallel on differential mode capacitor C after two RC filter circuit series connection
X2Two ends.
Described load port place also is 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, circuit is advanced in parallel connection after these two filter circuit series 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, the 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
Y2Be connected to after the ground connection on the positive and negative terminal of load port, be connected in parallel on differential mode capacitor C after two RC filter circuit series connection
X2Two ends.
2. potent power-supply filter according to claim 1 is characterized in that, described load port place also is 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. arbitrary described potent power-supply filter is characterized in that according to claim 1～3, 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 |
|---|---|---|---|
| CN2012203984691U CN202696153U (en) | 2012-08-13 | 2012-08-13 | Potent power supply filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203984691U CN202696153U (en) | 2012-08-13 | 2012-08-13 | Potent power supply filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202696153U true CN202696153U (en) | 2013-01-23 |
Family
ID=47551714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012203984691U Expired - Fee Related CN202696153U (en) | 2012-08-13 | 2012-08-13 | Potent power supply filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202696153U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595047A (en) * | 2012-08-13 | 2014-02-19 | 成都思迈科技发展有限责任公司 | A potent power supply filter |
| CN106301275A (en) * | 2016-08-30 | 2017-01-04 | 国网安徽省电力公司岳西县供电公司 | A kind of noise muffler |
-
2012
- 2012-08-13 CN CN2012203984691U patent/CN202696153U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595047A (en) * | 2012-08-13 | 2014-02-19 | 成都思迈科技发展有限责任公司 | A potent power supply filter |
| CN106301275A (en) * | 2016-08-30 | 2017-01-04 | 国网安徽省电力公司岳西县供电公司 | A kind of noise muffler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20130813 |