CN104578068A - Low-differential mode noise filter for router alternating-current power supply - Google Patents
Low-differential mode noise filter for router alternating-current power supply Download PDFInfo
- Publication number
- CN104578068A CN104578068A CN201310505595.1A CN201310505595A CN104578068A CN 104578068 A CN104578068 A CN 104578068A CN 201310505595 A CN201310505595 A CN 201310505595A CN 104578068 A CN104578068 A CN 104578068A
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- Prior art keywords
- coil
- electric capacity
- filter
- differential mode
- router
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- 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
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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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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Filters And Equalizers (AREA)
Abstract
The invention discloses a low-differential mode noise filter for a router alternating-current power supply. A common mode choke comprises a first coil and a second coil, and a differential mode choke comprises a third coil and a fourth coil. The first end of a first capacitor is connected with the first end of the first coil and used as the phase line input end of the filter, and the second end of the first capacitor is connected with the first end of the second coil and used as the null line input end of the filter. The second end of the first coil is connected with the third coil in series, then connected with each of the first end of a second capacitor, the first end of a resistor and the first end of a third capacitor and used as the phase line output end of the filter. The second end of the second coil is connected with the fourth coil in series, then connected with each of the second end of the second capacitor, the second end of the resistor and the first end of a fourth capacitor and used as the null line output end of the filter. The second end of the third capacitor and the second end of the fourth capacitor are connected with a ground wire. The low-differential mode noise filter can significantly reduce the common mode and differential mode noises of the router alternating-current power supply.
Description
Technical field
The present invention relates to a kind of filter for router, particularly relate to a kind of low differential mode noise filter for router AC power.
Background technology
Along with development and the application of microelectric technique, electromagnetic compatibility has become the important topic of research microelectronic device safety, stable operation.The technology suppressing electromagnetic interference to adopt mainly comprises filtering technique, layout and wiring technique, shield technology, grounding technology, Sealing Technology etc., wherein adopts filtering technique to carry out filtering to AC power and plays an important role to the interference of minimizing circuit noise.
In existing route device, also filtering process has been carried out to AC power, but be mainly main by capacitor filtering, its filter effect is not good enough, because line impedance is uneven in side circuit, make common-mode signal interference can be converted into the crosstalk interference not easily eliminated, and there is more serious differential mode noise, form differential mode interference.
Summary of the invention
Object of the present invention is just the low differential mode noise filter providing a kind of effective minimizing router AC power common mode disturbances and differential mode interference in order to solve the problem.
The present invention is achieved through the following technical solutions above-mentioned purpose:
Low differential mode noise filter for router AC power of the present invention comprises the first electric capacity ~ the 4th electric capacity, common mode choke, differential mode choke coil and resistance, described common mode choke comprises the first coil and the second coil, described differential mode choke coil comprises tertiary coil and the 4th coil, the first end of described first electric capacity is connected with the first end of described first coil and as the phase line input of described filter, second end of described first electric capacity is connected with the first end of described second coil and as the zero line input of described filter, second end of described first coil is connected with the first end of described tertiary coil, second end of described tertiary coil respectively with the first end of described second electric capacity, the first end of described resistance is connected with the first end of described 3rd electric capacity and as the phase line output terminal of described filter, second end of described second coil is connected with the first end of described 4th coil, second end of described 4th coil respectively with the second end of described second electric capacity, second end of described resistance is connected with the first end of described 4th electric capacity and as the zero line output of described filter, second end of described 3rd electric capacity, second end and the ground wire of described 4th electric capacity are interconnected.
Beneficial effect of the present invention is:
This filter by connecting common mode choke and differential mode choke coil in AC power, and forms filter circuit jointly in conjunction with electric capacity, resistance, effectively can reduce common mode disturbances and the differential mode interference of router power supply, reduces current noise.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the low differential mode noise filter for router AC power of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1, low differential mode noise filter for router AC power of the present invention comprises the first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, 4th electric capacity C4, common mode choke, differential mode choke coil and resistance R, described common mode choke comprises the first coil L1 and the second coil L2, described differential mode choke coil comprises tertiary coil L3 and the 4th coil L4, the first end of the first electric capacity C1 is connected with the first end of the first coil L1 and the phase line end of input Ui as described filter, second end of the first electric capacity C1 is connected with the first end of the second coil L2 and the zero line side of input Ui as described filter, second end of the first coil L1 is connected with the first end of tertiary coil L3, second end of tertiary coil L3 respectively with the first end of the second electric capacity C2, the first end of resistance R is connected with the first end of the 3rd electric capacity C3 and the phase line end of output Uo as described filter, second end of the second coil L2 is connected with the first end of the 4th coil L4, second end of the 4th coil L4 respectively with second end of the second electric capacity C2, second end of resistance R is connected with the first end of the 4th electric capacity C4 and the zero line side of output Uo as described filter, second end of the 3rd electric capacity C3, second end and the ground wire of the 4th electric capacity C4 are interconnected.The output Uo external load of described filter.
After the AC power of router inputs the input Ui of this filter, when its electric current flows through the first coil L1 and the second coil L2, the magnetic field produced can cancel each other, be equivalent to there is no inductive effect, therefore, it uses the magnetic core that magnetic permeability is high, and the common mode choke that the first coil L1 and the second coil L2 forms can suppress common mode conducted noise effectively; When electric current flows through the first coil L3 and the second coil L4, differential mode choke coil makes the charging current of the second electric capacity C2 reduce, and reaches the object suppressing differential mode noise.Electric capacity C1 ~ C4 also can play inhibitory action to current noise.Resistance R is then discharge resistance.
Claims (1)
1. the low differential mode noise filter for router AC power, it is characterized in that: comprise the first electric capacity ~ the 4th electric capacity, common mode choke, differential mode choke coil and resistance, described common mode choke comprises the first coil and the second coil, described differential mode choke coil comprises tertiary coil and the 4th coil, the first end of described first electric capacity is connected with the first end of described first coil and as the phase line input of described filter, second end of described first electric capacity is connected with the first end of described second coil and as the zero line input of described filter, second end of described first coil is connected with the first end of described tertiary coil, second end of described tertiary coil respectively with the first end of described second electric capacity, the first end of described resistance is connected with the first end of described 3rd electric capacity and as the phase line output terminal of described filter, second end of described second coil is connected with the first end of described 4th coil, second end of described 4th coil respectively with the second end of described second electric capacity, second end of described resistance is connected with the first end of described 4th electric capacity and as the zero line output of described filter, second end of described 3rd electric capacity, second end and the ground wire of described 4th electric capacity are interconnected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310505595.1A CN104578068A (en) | 2013-10-24 | 2013-10-24 | Low-differential mode noise filter for router alternating-current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310505595.1A CN104578068A (en) | 2013-10-24 | 2013-10-24 | Low-differential mode noise filter for router alternating-current power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104578068A true CN104578068A (en) | 2015-04-29 |
Family
ID=53093540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310505595.1A Pending CN104578068A (en) | 2013-10-24 | 2013-10-24 | Low-differential mode noise filter for router alternating-current power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104578068A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113280459A (en) * | 2021-05-06 | 2021-08-20 | 宁波奥克斯电气股份有限公司 | Air conditioner EMC optimizing circuit, air conditioner controller and air conditioner |
-
2013
- 2013-10-24 CN CN201310505595.1A patent/CN104578068A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113280459A (en) * | 2021-05-06 | 2021-08-20 | 宁波奥克斯电气股份有限公司 | Air conditioner EMC optimizing circuit, air conditioner controller and air conditioner |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150429 |