SU1665416A1 - Transformer - Google Patents

Abstract

The invention relates to electrical engineering and can be used as a power transformer in automation equipment, communications and computer equipment. The purpose of the invention is to reduce radio interference propagating between the windings and emitted into external space. The transformer consists of a double rod magnetic circuit 6 made of a material with increased losses at frequencies exceeding the frequency of the useful signal. The primary 1 and secondary 2 windings are spaced along the magnetic circuit 6. Between them is placed a third winding 3, loaded on capacitor 7. All windings are divided into two equal half windings located on different rods of the magnetic circuit 6, and recessed in its grooves. Outside, windings 1 and 2 are shielded with open bands 4 and 5. The inner ribbon 5 is made of a material with high magnetic permeability, and the outer 4 is made of a material with high electrical conductivity. Winding 3 and shields 4 and 5 are grounded. As a result, radio interference is not only not transmitted between the primary and secondary windings, but is also not radiated into the outer space. In addition, transformer dimensions are reduced. 2 Il.

Description

The invention relates to electrical engineering and can be used as a transformer for powering communications equipment, automation and computer technology.

The purpose of the invention is to reduce the level of radio interference.

Figure 1 shows the layout of the transformer windings on the magnetic conductor; in fig. 2 given their design.

The transformer contains the primary winding 1, divided into two equal half windings. The secondary winding 2 is also divided into two equal half windings. Between the windings 1 and 2 there is an additional winding 3, the half windings of which are located between the half windings 1 and 2. Primary 1 and secondary 2 the half windings are equipped on the outside with screens, each of which consists of two open closed tapes together. and inner tape 5 is made of a material with high magnetic permeability. The semi-windings of each winding are located on adjacent rods of the closed magnetic circuit 6 and its grooves. All windings 1, 2 and 3 are separated from each other along the rods of the magnetic circuit 6. The magnetic core 6 is made of a material with increased losses at frequencies

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exceeding the frequency of the voltage being converted. The tape screens 4 and 5 and the additional winding 3 are grounded. Additional winding 3 is loaded on the capacitor 7.

The transformer works as follows. A primary voltage is supplied to the primary winding 1 along with radio interference. The supply voltage through the magnetic circuit 6 is transformed into the secondary winding 2. Radio interference has a high frequency and is weakened in the magnetic circuit. To attenuate low-frequency radio interference, radio interference sent through the air next to the magnetic core 6, and electromagnetic fields, all other measures are used — the introduction of an additional winding 3, separation of the windings into half windings, placing them on different rods of the magnetic circuit, drowning windings into magnetic grooves and their shielding.

The additional winding 3 suppresses radio interference in two ways; firstly, as a grounded electrostatic separation screen, and, secondly, together with a capacitor, as a high-pass filter.

Separating the windings 1, 2, and 3 into the half windings makes it possible to place them on adjacent rods of the magnetic circuit 6 and thereby compensate for the surrounding electromagnetic field.

Drowning the windings into the grooves of the magnetic circuit 6 protects their ends from electromagnetic fields.

The outer parts of the windings are protected from the influence of electromagnetic fields by externally open tape grounded shields. The inner screen 5, made of a material with high magnetic permeability, incorporates magnetic fluxes, and the outer screen 4, made of a material with high electrical conductivity, does not pass the field through the thickness of the material.

All these measures also prevent the radio-frequency interference of the electromagnetic field outside the transformer, i.e. their radiation into outer space. The joint use of all interference suppressing measures allowed, in addition to achieving the traditional goal of suppressing radio interference between the primary and secondary windings, to achieve an additional positive effect — reducing radio interference into the surrounding space. In addition, transformer dimensions are reduced.

Formula of the Transformer A transformer containing a closed magnetic conductor and primary and secondary windings spaced along it, characterized in that, in order to reduce the level of radio interference, it contains a capacitor, open screens, a third winding placed between the first two and loaded on the capacitor, unclosed screens, located outside the primary and secondary windings consisting of two tapes put together, internally made of a material with high magnetic permeability, and externally made of a material with high electrical tion conductivity, each of the three windings is divided into two identical poluobmotki located on adjacent magnetic rods, each poluobmotka recessed groove in the magnetic circuit, whose material has a higher losses at frequencies higher than the frequency of the converted voltage, a third winding and grounded shields.

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Claims (1)

Claim A transformer containing a closed magnetic circuit and primary and secondary windings spaced along it, characterized in that, in order to reduce the level of radio interference, it contains a capacitor, open screens, a third winding located between the first two and loaded on the capacitor, open screens, are located outside the primary and secondary windings consisting of two ribbons folded together, the inner one is made of a material with high magnetic permeability, and the outer one is made of a material with high electrical conductivity, each I of three windings is divided into two identical half-windings located on adjacent terminals of the magnetic circuit, each half-winding is recessed into the groove of the magnetic circuit, whose material has increased losses at frequencies higher than the frequency of the converted voltage, the third winding and the screens are grounded. Figure 1 Compiled by M. Zicherman Editor L. Lashkova Tehred M. Morgenthal Corrector M. Demchik Order 2395 Circulation 359 Subscription VNIIIPI of the State Committee for Inventions and Discoveries under the State Committee for Science and Technology of the USSR 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Combine Patent, Uzhgorod, 101 Gagarin St. G