CN203522526U - Low-noise filter for AC power of router - Google Patents
Low-noise filter for AC power of router Download PDFInfo
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- CN203522526U CN203522526U CN201320661389.5U CN201320661389U CN203522526U CN 203522526 U CN203522526 U CN 203522526U CN 201320661389 U CN201320661389 U CN 201320661389U CN 203522526 U CN203522526 U CN 203522526U
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Abstract
The utility model discloses a low-noise filter for AC power of a router, wherein, a common-mode choke coil comprises a first coil and a second coil. The first end of a first capacitor is connected with the first end of the first coil and is used as a phase line input end of the filter. The second end of the first capacitor is connected with the first end of the second coil and is used as a zero line input end of the filter. The second end of the first coil is connected with the first end of a second capacitor, the first end of a second resistor and the first end of a fourth capacitor respectively and is used as a phase line output end of the filter. The second end of the second capacitor is connected with the first end of a third capacitor and the first end of the first resistor. The second end of the second coil is connected with the second end of the third capacitor, the second end of the first resistor, the second end of the second resistor and the first end of a fifth capacitor respectively and is used as a zero line output end of the filter. The second end of the fourth capacitor, the second end of the fifth capacitor and a ground line are interconnected. The filter provided by the utility model can effectively reduce common-mode interference for power of the router.
Description
Technical field
The utility model relates to a kind of filter for router, relates in particular to a kind of low 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 that suppresses electromagnetic interference employing 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 reducing circuit noise interference.
In existing route device, AC power has also been carried out to filtering processing, but be to be mainly main by capacitor filtering, its filter effect is not good enough, in side circuit, because line impedance is uneven, makes common-mode signal interference can be converted into the crosstalk interference that is difficult for elimination.
Utility model content
The purpose of this utility model is just to provide in order to address the above problem a kind of low noise filter of effective minimizing router AC power common mode disturbances.
The utility model is achieved through the following technical solutions above-mentioned purpose:
Low noise filter for router AC power described in the utility model comprises the first electric capacity～five electric capacity, common mode choke, the first resistance and the second resistance, described common mode choke comprises the first coil and the second coil, the first end of described the first electric capacity is connected with the first end of described the first coil and as the phase line input of described filter, the second end of described the first electric capacity is connected with the first end of described the second coil and as the zero line input of described filter, the second end of described the first coil respectively with the first end of described the second electric capacity, the first end of the first end of described the second resistance and described the 4th electric capacity is connected and as the phase line output terminal of described filter, the second end of described the second electric capacity is connected with the first end of described the first resistance with the first end of described the 3rd electric capacity respectively, the second end of described the second coil respectively with the second end of described the 3rd electric capacity, the second end of described the first resistance, the second end of described the second resistance is connected with the first end of described the 5th electric capacity and as the zero line output of described filter, the second end of described the 4th electric capacity, the second end and the ground wire of described the 5th electric capacity interconnect.
The beneficial effects of the utility model are:
This filter is by the common mode choke of connecting in AC power, and jointly forms filter circuit in conjunction with electric capacity, resistance, can effectively reduce the common mode disturbances of router power supply, reduces current noise.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the low noise filter for router AC power described in the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1, low noise filter for router AC power described in the utility model comprises the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, common mode choke, the first resistance R 1 and the second resistance R 2, described common mode choke comprises the first coil L1 and the second coil L2, the first end of the first capacitor C 1 is connected with the first end of the first coil L1 and as the phase line end of the input Ui of described filter, the second end of the first capacitor C 1 is connected with the first end of the second coil L2 and as the zero line side of the input Ui of described filter, the second end of the first coil L1 respectively with the first end of the second capacitor C 2, the first end of the first end of the second resistance R 2 and the 4th capacitor C 4 is connected and as the phase line end of the output Uo of described filter, the second end of the second capacitor C 2 is connected with the first end of the first resistance R 1 with the first end of the 3rd capacitor C 3 respectively, the second end of the second coil L2 respectively with the second end of the 3rd capacitor C 3, the second end of the first resistance R 1, the second end of the second resistance R 2 is connected with the first end of the 5th capacitor C 5 and as the zero line side of the output Uo of described filter, the second end of the 4th capacitor C 4, the second end and the ground wire of the 5th capacitor C 5 interconnect.The output Uo external load of described filter.
When the AC power of router, input after the input Ui of this filter, when its electric current flows through the first coil L1 and the second coil L2, can cancel each other in the magnetic field producing, and being equivalent to does not have inductive effect, and therefore, it uses the high magnetic core of magnetic permeability.The common mode choke that the first coil L1 and the second coil L2 form can suppress common mode conducted noise effectively.Capacitor C 1～C5 also can play inhibitory action to common-mode noise.Resistance R 1 and R2 are discharge resistance.
Claims (1)
1. the low noise filter for router AC power, it is characterized in that: comprise the first electric capacity～five electric capacity, common mode choke, the first resistance and the second resistance, described common mode choke comprises the first coil and the second coil, the first end of described the first electric capacity is connected with the first end of described the first coil and as the phase line input of described filter, the second end of described the first electric capacity is connected with the first end of described the second coil and as the zero line input of described filter, the second end of described the first coil respectively with the first end of described the second electric capacity, the first end of the first end of described the second resistance and described the 4th electric capacity is connected and as the phase line output terminal of described filter, the second end of described the second electric capacity is connected with the first end of described the first resistance with the first end of described the 3rd electric capacity respectively, the second end of described the second coil respectively with the second end of described the 3rd electric capacity, the second end of described the first resistance, the second end of described the second resistance is connected with the first end of described the 5th electric capacity and as the zero line output of described filter, the second end of described the 4th electric capacity, the second end and the ground wire of described the 5th electric capacity interconnect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320661389.5U CN203522526U (en) | 2013-10-25 | 2013-10-25 | Low-noise filter for AC power of router |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320661389.5U CN203522526U (en) | 2013-10-25 | 2013-10-25 | Low-noise filter for AC power of router |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203522526U true CN203522526U (en) | 2014-04-02 |
Family
ID=50381399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320661389.5U Expired - Fee Related CN203522526U (en) | 2013-10-25 | 2013-10-25 | Low-noise filter for AC power of router |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203522526U (en) |
-
2013
- 2013-10-25 CN CN201320661389.5U patent/CN203522526U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140402 Termination date: 20141025 |
|
| EXPY | Termination of patent right or utility model |