RU202413U1 - AC INTERFERENCE FILTER IN MODULAR VERSION - Google Patents

Abstract

The utility model relates to the field of electrical and radio engineering. The technical result consists in expanding the suppression band of electromagnetic interference and spurious electromagnetic radiation and interference, increasing the value of the introduced attenuation in the suppression band of the filter. An electromagnetic interference suppression filter in modular AC design in a double shielding case, consisting of at least three inductive elements of the filtering elements, including interference suppression inductively coupled common-mode filter chokes with a two-wire structure, capacitors, common-mode filter chokes are made on toroidal cores, a filter suppression of electromagnetic interference in a modular design of alternating current in a double shielded case, in-mode filters and inductors with coiled copper insulated wire windings are poured with a solidifying compound containing nanocrystalline and amorphous crushed fractions and ferromagnetic powders. 1 ill.

Description

The technical solution relates to the field of electrical engineering and radio engineering and can be used as noise suppression filters of electromagnetic interference installed in the AC power supply circuit to reduce spurious electromagnetic radiation and interference (PEMIN) and improve electromagnetic compatibility (EMC) of power supplies and power converters of the type AC / DC.

A systematic approach to reduce electromagnetic interference, PEMIN and improve electromagnetic compatibility includes a list of technical measures such as shielding, grounding, correct wiring and filtering.

In modern power supplies for electronic equipment, power supplies and AC / DC converters are increasingly used, which, as a rule, can be sources of electromagnetic interference in a wide frequency range. Therefore, the problem arose of expanding the frequency spectrum of suppression of electromagnetic interference and their harmonics.

An effective method of EMI suppression is to use AC EMI suppression filters. Filtration as a means of reducing the vulnerability of telecommunication equipment with interference suppression filters is devoted to many publications (for example, Kechiev L.N., Stepanov P.A. "EMC and information security in telecommunication systems" M .: Publishing House "Technologies", 2005).

Known noise suppression filters for AC circuits from MORNSUN, EMC Filter FC-L01D. (www.mornsun-power.com).

Known noise suppression filters in modular design, filter modules of the "MR" series, produced by the company "AEDON" Voronezh, designed to improve electromagnetic compatibility in AC power supply circuits with a voltage of 115, 220 V, with a maximum operating current of up to 7.5 A at input voltage 115 V, as well as for suppression of radio interference in a given (0.15-30 MHz) frequency range with suppression of radio interference from 30 to 60 dB. (www.aedon.ru).

The above noise suppression filters to reduce the levels of radio interference in AC power circuits have:

from MORNSUN with an efficiency of interference suppression up to 30 dB, in the frequency range from 0.15 to 100 MHz, input voltage from 85 to 306 V, maximum operating current up to 1.0 A

LLC "AEDON" filter modules of the "MR" series with the efficiency of radio interference suppression from 30 to 60 dB, in the frequency range from 0.15 to 30 MHz, input voltage 115 and 220 V, maximum operating current up to 7.5 A at input voltage 115 V

Electromagnetic shields are structures designed to attenuate electromagnetic fields created by sources of electromagnetic interference in space. The theoretical description of the operation of electromagnetic shields is based on the fact that their action is to reflect and direct the flow of energy created by the field sources, preventing it from entering the protected area of space. The mechanism of the reflective and directing action of the screens on the flows of electromagnetic energy is inextricably linked with the appearance on the surface and in the thickness of the structures of the screens of charges, currents and polarizations. In the general case, the screen not only weakens, but also distorts the source field in the protected area; therefore, the screening efficiency turns out to be different for the electric and magnetic components of the electromagnetic field. An electromagnetic shield is a structure designed to attenuate electromagnetic fields generated by sources in a certain area of space that do not contain these sources. In most cases, electromagnetic shields are made of metals.

A set of issues related to the development of effective shields and shielding systems for technical equipment operating in a wide frequency range, shielding materials and coatings, shielding of low-frequency magnetic fields, the design of shielding cases and their elements are detailed in the literature (for example, Kechiev L.N. , Akbashev BB, Stepanov PV "Shielding of technical means and shielding systems" M .: 2010).

The problem to be solved by the claimed technical solution is to expand the suppression band of electromagnetic interference and PEMIN, increase the value of the insertion loss in the suppression band of the filter.

This task is achieved due to the fact that the noise suppression filter of electromagnetic interference for AC circuits, consisting of at least three inductive elements of the filtering elements, including noise suppression inductively coupled common mode chokes of filters, inductors, capacitors, chokes of common mode filters are made on toroidal cores. The interference suppression filter of electromagnetic interference is made in a double shielding case, the common mode chokes of filters and inductors with coiled copper insulated wire windings are poured with a solidifying compound containing nanocrystalline and amorphous crushed fractions and ferromagnetic powders.

Modular versions of electromagnetic interference suppression filters allow their installation in 115 and 220 V AC power supply circuits, with rated currents up to 40 A.

Filters for suppression of electromagnetic interference of alternating current with a frequency of 50 and 400 Hz can be used in versions with different values of the rated currents (1, 3, 5, 10, 16, 25, 40, A) and, accordingly, the value of the voltage insertion loss up to 70 dB in the suppression band from 100 kHz to 500 MHz, for installation in the 115 and 220 V power supply circuit.

The technical result provided by the above set of features is the expansion of the suppression band of electromagnetic interference and PEMIN, an increase in the value of the introduced attenuation in the suppression band of the filter.

The presence of a causal relationship between the set of essential features of the claimed object and the achieved technical result is shown in Table 1.

The technical solution is illustrated by a drawing (Fig. 1) an electromagnetic interference suppression filter for alternating current circuits, where it is indicated:

1. Metal body

2. Metal inner shield

3. Capacitor

4. Choke winding

5. Common-mode filter choke

6. Inductance

The technical feasibility of the utility model follows from the description of the filter for suppression of electromagnetic interference in statics and dynamics with the practical achievement of the specified technical result.

Claims (1)

An AC interference suppression filter in a modular design, consisting of at least three inductive filter elements, including interference suppression inductively coupled common mode chokes of filters with a two-wire structure, inductors, capacitors, characterized in that the filter is an interference suppression filter for AC circuits in a modular execution is made in a double shielding case, common-mode filter chokes are made on toroidal cores, in-mode filter and inductance chokes with windings wound with copper insulated wire are poured with a solidifying compound containing nanocrystalline and amorphous crushed fractions and ferromagnetic powders.

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