CN214955330U - Electromagnetic interference device compatible with low-voltage meter reading system - Google Patents
Electromagnetic interference device compatible with low-voltage meter reading system Download PDFInfo
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- CN214955330U CN214955330U CN202121343529.5U CN202121343529U CN214955330U CN 214955330 U CN214955330 U CN 214955330U CN 202121343529 U CN202121343529 U CN 202121343529U CN 214955330 U CN214955330 U CN 214955330U
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Abstract
The utility model discloses a compatible low pressure system electromagnetic interference device of checking meter is provided with choke coil on the live wire of the power output end of ammeter and alternating current power supply load. The choke coil consists of a wire and a magnetic core, the wire is connected in series with a live wire of the power output end of the electric meter and an alternating current power supply load, and the wire is uniformly wound on the magnetic core. The ferrite material absorbs electromagnetic waves by utilizing a magnetic loss mechanism generated by unique complex permeability of the ferrite material, and the cost is low. The MnZn ferrite is more suitable for resisting electromagnetic interference with frequency of more than 10KHz, and the shape of the magnetic core is in a general circuit for resisting EMI. The utility model discloses a setting up the parameter and can having obvious decay to the electromagnetic interference frequency noise signal below 300KHz, and this the utility model discloses can play the help to improving carrier signal transmission distance and transmission quality, convenient to use has the value of popularization and application.
Description
Technical Field
The utility model relates to an anti-electromagnetic interference device especially relates to a compatible low pressure system electromagnetic interference device of checking meter.
Background
Electromagnetic interference sources on power lines are generally of two types: one is from the thunder and lightning in the air, the thunder and lightning produces the strong electromagnetic field in the time of coming, the electromagnetic field induces very high electromagnetic interference on the low-voltage power line; another is from jamming, for example: household appliances, switching power supplies, and the like, which radiate electromagnetic interference in the form of electromagnetic energy onto power lines when they are operated.
For an automatic meter reading system, a large number of electric devices on a power line release continuously variable interference signals at the same time, and the interference signals are transmitted to the system through the power line; electromagnetic interference, in the form of voltage or current, is coupled into the circuit by wires or coupling elements such as capacitors, inductors, transformers, etc. to interfere with the reception of data. Therefore, when designing a low-voltage meter reading communication scheme, the electromagnetic compatibility (EMC) of the system must be considered, so that the system can bear certain external electromagnetic interference in a complex electromagnetic environment to keep normal operation, and cannot generate unacceptable electromagnetic interference on other electric equipment.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a compatible low pressure system electromagnetic interference device of checking meter in order to solve above-mentioned problem just. Aiming at an automatic meter reading system for transmitting data on a low-voltage power line, a filter is adopted to inhibit the interference from a power line, so that the sensitivity of an internal circuit to the interference is reduced, a choke coil is connected in series between the low-voltage meter reading and a user side, the choke coil has the function of preventing an electromagnetic interference signal generated by the user side from being coupled into an electric meter through a lead, and meanwhile, the choke coil can also prevent the electromagnetic interference generated by the electric meter system from entering the user side to interfere the work of other electric equipment.
The utility model discloses a following technical scheme realizes above-mentioned purpose:
the utility model discloses a power line network and ammeter, the power input end of ammeter inserts the power line network, be provided with choke coil on the power output end of ammeter and the live wire of alternating current power supply load.
Furthermore, the choke coil is composed of a conducting wire and a magnetic core, the conducting wire is connected in series with a live wire of the power output end of the electric meter and an alternating current power supply load, and the conducting wire is uniformly wound on the magnetic core.
Specifically, the magnetic core is made of ferrite material. Preferably, the ferrite material is MnZn ferrite.
Preferably, the number of turns of the coil wound by the lead is 25, the thickness of the coil is 7mm, the outer diameter of the coil is 30mm, and the inner diameter of the coil is 20 mm.
The beneficial effects of the utility model reside in that:
the utility model relates to a compatible low pressure system electromagnetic interference device of checking meter, compared with the prior art, the utility model discloses a set up the parameter and can have obvious decay to the noise signal of electromagnetic interference frequency below 300 KHz. Through spectrum analysis, the attenuation of the coil device to noise can reach more than 20 dB. Experiments verify that the coil can allow power frequency signals to pass through, and can play a certain inhibiting role in interference signals, in a word, the device can play a helping role in improving the transmission distance and the transmission quality of carrier signals, is convenient to use, and has popularization and application values.
Drawings
FIG. 1 is a diagram of the access of the utility model to a meter reading system;
fig. 2 is a schematic structural diagram of the present invention;
fig. 3 is a schematic diagram of the magnetic core geometry of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in fig. 1: the utility model discloses a power line network and ammeter, the power input end of ammeter inserts the power line network, be provided with choke coil on the power output end of ammeter and the live wire of alternating current power supply load.
As shown in fig. 2: the choke coil is composed of a wire 1 and a magnetic core 2, the wire is connected in series with a live wire of the power output end of the electric meter and an alternating current power supply load, and the wire is uniformly wound on the magnetic core. The lead is wound on a ferrite magnetic core ring, and the electromagnetic wave is absorbed by utilizing a magnetic loss mechanism generated by the unique complex permeability of the ferrite material, so that the cost is low. MnZn ferrite is more suitable for resisting electromagnetic interference with frequency above 10KHz, so the MnZn ferrite is selected to attenuate EMI, and as for the shape of the magnetic core, a general circuit for resisting EMI is selected. The working carrier frequency of low-voltage meter reading is about 300KHz generally, and is easy to be received fromThe frequency of the user side of the power grid is about 300KHz electromagnetic interference, and a useful signal is often submerged in the noise of the electromagnetic interference, so that the signal is difficult to extract at the receiving end, so that the filtering frequency range of the choke coil device is below 300KHz, as shown in fig. 3: the filter frequency range of the choke coil device is below 300KHz, and the inductance value is about 0.8mH, so that the requirement can be met. The number of turns of the coil is 25 turns, the thickness h is 7mm, the outer diameter D is 30mm, and the inner diameter D is 20 mm. In fig. 3: n represents the number of turns of the coil, S represents the cross-sectional area of the core, μ represents the relative permeability of the core, lmRepresenting the effective magnetic path length. H thickness, D outer diameter, D inner diameter, core sectional area S ═ h (D-D)/2, effective magnetic path length lmPi (D-D)/lg (D-D). Compared with the prior art, the utility model discloses a set up the parameter and can have obvious decay to the noise signal of electromagnetic interference frequency below 300 KHz.
The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a compatible low pressure meter reading system electromagnetic interference device, includes power line network and ammeter, the power input of ammeter inserts the power line network, its characterized in that: and choke coils are arranged on the power output end of the electric meter and a live wire of the alternating current power supply load.
2. The electromagnetic interference device compatible with the low-voltage meter reading system according to claim 1, wherein: the choke coil is composed of a conducting wire and a magnetic core, the conducting wire is connected in series with a live wire of the power output end of the electric meter and an alternating current power supply load, and the conducting wire is uniformly wound on the magnetic core.
3. The electromagnetic interference device compatible with the low-voltage meter reading system according to claim 2, wherein: the magnetic core is made of ferrite materials.
4. The electromagnetic interference device compatible with the low-voltage meter reading system according to claim 3, wherein: the ferrite material is MnZn ferrite.
5. The electromagnetic interference device compatible with the low-voltage meter reading system according to claim 2, wherein: the number of turns of the coil wound by the lead is 25 turns, the thickness of the coil is 7mm, the outer diameter of the coil is 30mm, and the inner diameter of the coil is 20 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121343529.5U CN214955330U (en) | 2021-06-17 | 2021-06-17 | Electromagnetic interference device compatible with low-voltage meter reading system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121343529.5U CN214955330U (en) | 2021-06-17 | 2021-06-17 | Electromagnetic interference device compatible with low-voltage meter reading system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214955330U true CN214955330U (en) | 2021-11-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121343529.5U Active CN214955330U (en) | 2021-06-17 | 2021-06-17 | Electromagnetic interference device compatible with low-voltage meter reading system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214955330U (en) |
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2021
- 2021-06-17 CN CN202121343529.5U patent/CN214955330U/en active Active
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