CN2742622Y - Three phase plug power line - Google Patents
Three phase plug power line Download PDFInfo
- Publication number
- CN2742622Y CN2742622Y CN 200420098883 CN200420098883U CN2742622Y CN 2742622 Y CN2742622 Y CN 2742622Y CN 200420098883 CN200420098883 CN 200420098883 CN 200420098883 U CN200420098883 U CN 200420098883U CN 2742622 Y CN2742622 Y CN 2742622Y
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- live wire
- electromagnetic interference
- power line
- phase plug
- plug
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Abstract
The utility model discloses a power line of a three-phase plug, which comprises a plug and a power line, wherein a fire line and a zero line in the plug are connected with an electromagnetic interference filter which can use three structures which are in an n shape, a T shape and an L shape. The problem of the conducted interference of the power end in the electromagnetic compatibility is effectively solved by adding a filter circuit in the three-phase plug. The utility model performs the function of cutting off the conducted interference of the external power and improves the complete operating performance of electric equipment on the precondition that the machine core circuit design and the internal structure design are not changed.
Description
Technical field
The utility model relates to a kind of improvement of used as television power line, specifically, relates to a kind of improvement that suppresses the 3-phase plug power line of power end conducted interference.
Background technology
As everyone knows, the measurement of Electro Magnetic Compatibility EMC is divided into interference (harassing and wrecking) and anti-interference two parts.Electromagnetic interference (Electromagnetic Interference) is called for short EMI, and measurement parameter generally has two, i.e. radiated interference (Radiated Interference) and conducted interference (Conducted Interference).So-called radiated interference is meant the interference by spatial transmission; So-called conducted interference is meant the interference that produces by power end.The conducted interference of nearly all equipment all comprises common mode disturbances and differential mode interference two parts, and wherein, common mode disturbances is because the potential difference between current and the earth produces, and is characterized in that two noise voltages on the line are in the same way idiostatic; Differential mode interference then is because the potential difference between the current produces, and is characterized in that two noise voltages on the line are idiostatic reverse.Usually, these two kinds of components of interference voltage are simultaneous on the circuit, since the imbalance of line impedance, two kinds of components meeting phase co-conversion in transmission, and situation is very complicated.At present, adopt in the electric equipment of 3-phase plug power line power supply at all, because three pin plug directly links to each other with power circuit in the electric equipment, therefore, conducted interference is easy to be delivered in the internal circuit of equipment by power end, cause the change of electric equipment performance bad, influence the stability of equipment work.
Summary of the invention
The utility model is in order to solve the problem of power end conducted interference in the electromagnetic compatibility, a kind of 3-phase plug power line of incorporating filter is provided, it is by setting up filter circuit in 3-phase plug, under the prerequisite of not changing movement circuit design and internal structure design, played the effect of cutting off the external power source conducted interference.
For solving the problems of the technologies described above, the utility model is achieved by the following technical programs:
A kind of 3-phase plug power line comprises plug and power line, wherein, is connected with an Electromagnetic interference filter between the live wire of described plug inside and zero line.
As a preferred embodiment of the present utility model, described Electromagnetic interference filter adopts the π shape structure of band common mode choke coil, and wherein, common mode choke coil is connected on the live wire and zero line of power supply, at the two ends of described coil, be parallel with an electric capacity between live wire and the zero line respectively.
As another preferred embodiment of the present utility model, described Electromagnetic interference filter adopts T shape structure, and wherein, two inductance are connected on the live wire of power supply, are parallel with an electric capacity between the junction of described two inductance live wire and zero line.
As another preferred embodiment of the present utility model, described Electromagnetic interference filter adopts L shaped structure, wherein, is in series with an inductance on live wire, is parallel with an electric capacity between live wire and the zero line.
Compared with prior art, advantage of the present utility model with good effect is: the utility model is by being connected Electromagnetic interference filter on the live wire of three phase mains plug inside and zero line, effectively filtering the conducted interference that produces of power end.This circuit structure is simple, under the prerequisite of not changing movement circuit design and internal structure design, has played the effect of cutting off the external power source conducted interference.
Description of drawings
Fig. 1 is the circuit diagram of π shape Electromagnetic interference filter in the utility model;
Fig. 2 is the circuit diagram that adopts T shape Electromagnetic interference filter;
Fig. 3 is the circuit diagram that adopts L shaped Electromagnetic interference filter;
Fig. 4 does not add the preceding electromagnetic interference waveform figure of filter circuit;
Fig. 5 is the electromagnetic interference waveform figure behind the adding filter circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Make Electromagnetic interference filter best fade performance be arranged to electromagnetic interference EMI signal, then the impedance of filter should with the source impedance mismatch, mismatch is severe more, the decay of realization is unreasonable to be thought, the insertion loss characteristic that obtains is just good more.That is to say that if the noise source internal resistance is low-impedance, then the input impedance of the Electromagnetic interference filter of butt joint should be high impedance with it, for example, selects the very big series inductance of inductance value for use; If the noise source internal resistance is a high impedance, then the input impedance of Electromagnetic interference filter should be low-impedance, for example, selects the very big shunt capacitance of capacity for use.
Electromagnetic interference filter of the present utility model adopts the π shape structure of band common mode choke coil, and its physical circuit connection layout is referring to shown in Figure 1.Wherein, on the live wire L of 3-phase plug and zero line N, be connected with a common mode choking-winding L1, described common mode choke coil L1 forms live wire L and zero line N around same magnetic core, two coil turns are identical, around on the contrary, the magnetic flux of two interior electric current generations of coil is cancelled out each other in magnet ring, can not make magnet ring reach the magnetic saturation state, thereby the inductance value of two coils is remained unchanged.In addition, at the two ends of described coil L1, be parallel with capacitor C 1, C2 respectively between live wire L and the zero line N, constitute low pass filter on L and the N line with this, be used for the common mode electromagnetic interference EMI signal that suppresses to exist on the power line, make it to be decayed, it is controlled on the very low level.
Fig. 4 is the oscillogram that does not insert the preceding power supply electromagnetic interference of filter, and Fig. 5 is the electromagnetic interference waveform figure behind the described pi filter of adding.Can be clearly seen that from figure described filter has played the good restraining effect to the electromagnetic interference of Switching Power Supply.In addition, Electromagnetic interference filter of the present utility model can adopt T shape and L shaped two kinds of structures too, and its physical circuit annexation is referring to Fig. 2 and shown in Figure 3.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (4)
1. a 3-phase plug power line comprises plug and power line, it is characterized in that: be connected with an Electromagnetic interference filter between the live wire of described plug inside and zero line.
2. 3-phase plug power line according to claim 1, it is characterized in that: described Electromagnetic interference filter adopts the π shape structure of band common mode choke coil, wherein, common mode choke coil is connected on the live wire and zero line of power supply, at the two ends of described coil, be parallel with an electric capacity between live wire and the zero line respectively.
3. 3-phase plug power line according to claim 1, it is characterized in that: described Electromagnetic interference filter adopts T shape structure, wherein, two inductance are connected on the live wire of power supply, are parallel with an electric capacity between the junction of described two inductance live wire and zero line.
4. 3-phase plug power line according to claim 1 is characterized in that: described Electromagnetic interference filter adopts L shaped structure, wherein, is in series with an inductance on live wire, is parallel with an electric capacity between live wire and the zero line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420098883 CN2742622Y (en) | 2004-11-12 | 2004-11-12 | Three phase plug power line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420098883 CN2742622Y (en) | 2004-11-12 | 2004-11-12 | Three phase plug power line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2742622Y true CN2742622Y (en) | 2005-11-23 |
Family
ID=35478087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420098883 Expired - Fee Related CN2742622Y (en) | 2004-11-12 | 2004-11-12 | Three phase plug power line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2742622Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102918402A (en) * | 2009-11-14 | 2013-02-06 | 博通欧洲有限公司 | Current measuring apparatus |
-
2004
- 2004-11-12 CN CN 200420098883 patent/CN2742622Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102918402A (en) * | 2009-11-14 | 2013-02-06 | 博通欧洲有限公司 | Current measuring apparatus |
| US9116171B2 (en) | 2009-11-14 | 2015-08-25 | Broadcom Europe Limited | Current measuring apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |