RU227554U1 - AC ELECTROMAGNETIC INTERFERENCE FILTER - Google Patents

Abstract

The utility model relates to the field of electrical engineering and can be used as a filter for suppressing alternating current electromagnetic interference. The AC electromagnetic interference suppression filter with a common-mode noise suppression choke is made on toroidal magnetic cores made of amorphous iron-based and nanocrystalline cobalt-based alloys in the form of thin strips. The twisted tape magnetic core is placed in a rigid protected container. The container has rounded edges, on top of which windings are wound with insulated copper wire. The container with windings is placed in a plastic cylindrical container, with winding leads on both sides, for example, for installation in cylindrical structures. The conductors of the windings of the common-mode noise suppression choke are routed through metallized holes of printed circuit boards, to which two to four ceramic chip capacitors are soldered. The main foil covering of the printed circuit boards is connected to the metal housing of the AC EMI suppression filter. The utility model makes it possible to suppress common-mode interference in a wide frequency range. 1 ill.

Description

The utility model relates to the field of electrical engineering and is used as a filter for suppressing electromagnetic interference of alternating current using common-mode noise suppression chokes made on toroidal magnetic cores made of thin nanocrystalline iron-based (AMAG 200C) and amorphous cobalt-based (AMAG 170) tapes intended for installation in noise suppression filters.

AC electromagnetic interference suppression filters with common-mode noise suppression chokes are installed in the power supply circuit of electricity consumers to reduce electromagnetic interference in power supply networks, as well as reduce spurious electromagnetic radiation and interference (PEMIN) and improve electromagnetic compatibility (EMC) of radio-electronic equipment.

A systematic approach to reducing electromagnetic interference, PEMIN and improving electromagnetic compatibility includes a list of technical measures such as shielding, grounding, proper wiring and filtering.

An effective way to suppress electromagnetic interference is to use electromagnetic interference suppression filters in power supply circuits. Many publications are devoted to filtering as a means of reducing the vulnerability of telecommuting equipment with noise suppression filters (for example, Kechiev L.N., Stepanov P.A. “EMC and information security in telecommunication systems” M.: Publishing House “Technology”, 2005.)

The application area of common mode filters covers a wide range of devices: telecommunication systems, switching power supplies, frequency converters, uninterruptible power supplies (UPS) and other products. Having a typical magnetic permeability value of 120,000 or more, common-mode filter chokes based on magnetic cores made of thin nanocrystalline and amorphous tapes require a smaller number of winding turns, which ensures low parasitic capacitance. They are smaller in size and provide higher insertion loss over a wide frequency range compared to traditional ferrite and permalloy based products.

Reducing the weight and reducing the overall dimensions of filters with common-mode noise suppression chokes is one of the main tasks, especially in aviation technology, in the development of aircraft, in rocket science and other fields of science and technology.

Common-mode noise suppression chokes are known, made on toroidal magnetic cores, mainly on ferrite cores from EPCOS, TE Connectivity, WURTH ELEKTRONIK, and others.

Common-mode noise-suppressing chokes on magnetic cores made of amorphous and nanocrystalline alloys of the Russian enterprise PJSC MSTATOR (www.mstator.ru) are known.

A device for suppressing electromagnetic interference is known, Patent RU 202587, class. H01F 37/00, H04 15/02, H01F 17/06, H01F 1/14, H01F 1/153, published: 02/25/2021, Bull. No. 6.

All of the listed devices have inductance windings of common-mode noise suppression chokes, but do not contain capacitors. The objective of the technical solution is to suppress common-mode interference over a wide frequency range.

The problem is solved due to the fact that the filter for suppressing electromagnetic interference of alternating current with a common-mode noise suppression choke is made on toroidal magnetic cores made of amorphous iron-based and nanocrystalline cobalt-based alloys in the form of thin tapes, the twisted tape magnetic core is placed in a rigid protected container, the container has rounded edges, on top of which the windings are wound, with copper insulated wire, the container with the windings is placed in a plastic cylindrical container and filled with a hardening compound, with winding leads on both sides, for example, for installation in cylindrical structures, characterized in that the conductors of the common mode suppression choke windings are brought out through metallized holes of printed circuit boards, isolated from the main foil coating, printed circuit boards have double-sided foil coatings and the same topology on both sides, the main parts of the foil coating of the board are interconnected by conductive holes, on the inside of the boards they are installed and soldered evenly distributed around the circumference, from two to four ceramic chip capacitors, the main foil coating of the circuit boards is connected to the metal housing of the AC EMI suppression filter.

AC electromagnetic interference suppression filters with common-mode noise suppression chokes can be used in versions with different rated load currents of 10, 16, 25, 40, 63 A and, accordingly, the required value of the magnetic circuit cross-section.

The essence of the technical solution is illustrated by a drawing, which shows:

In (Fig. 1) AC electromagnetic interference suppression filter, where it is indicated:

1. Printed circuit board,

2. Ceramic chip capacitor,

3. Toroidal magnetic circuit,

4. Choke winding,

5. Metal body,

6. Conductive holes,

H1, H2 - Conclusions of the beginning of windings 1, 2,

K1, K2 - Terminals of the end of windings 1, 2.

The technical result provided by the above set of features is the suppression of common-mode interference in a wide frequency range.

Practical testing of the claimed technical solution confirmed the suppression of common-mode interference in a wide frequency range.

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

Table 1.

Types of technical results and their dimensions. Indicators are actual or calculated. An explanation of why (a distinctive feature and/or their combination) made it possible to improve the performance of the proposed object in comparison with the prototype. prototype the declared object. 1. Common Mode Rejection (dB) thirty 40 Through the use of a common mode noise suppression choke.

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

Claims (1)

AC electromagnetic interference suppression filter with a common-mode noise suppression choke, made on toroidal magnetic cores made of amorphous iron-based and cobalt-based nanocrystalline alloys in the form of thin tapes, the twisted tape magnetic core is placed in a rigid protected container, the container has rounded edges, on top of which the windings, copper insulated wire, the container with the windings is placed in a plastic cylindrical container, with winding leads on two sides, for example, for installation in cylindrical structures, characterized in that the conductors of the windings of the common mode noise suppression choke are brought out through metallized holes of printed circuit boards, to which they are soldered two to four ceramic chip capacitors, the main foil coating of the circuit boards is connected to the metal housing of the AC EMI suppression filter.