SU807392A1 - Broad-band transformer - Google Patents

Description

(54) BROADBAND TRANSFORMER

one

The invention relates to radio engineering, in particular to the design and manufacture of high-frequency wideband differential transformers.

Known differential transformers containing two magnetic pipelines, each of which contains multi-turn windings. The magnetic cores have two pairs of inputs serving to connect loads and generators, depending on the designation of the device 1.

A disadvantage of the known transformers is the limited operating frequency band caused by the inductances of the scattering windings, their own and mutual capacitances, as well as the increase in power loss f due to the presence of two magnetic cores, i.e. the sum of the power losses in both.

The closest to the proposed one is a broadband transformer containing a conductor made of 2N (N is any integer) of series-connected sections combined into two multi-wire lines, the first of which

there are odd sections of the conductor, and in the second section there are even sections of the conductor, and another conductor located in the first multi-wire line, the beginning of which is connected to the end of the first conductor and common cable 2. The transformer has a wide operating frequency band, but cannot be used independently as a differential transformer.

In order to obtain a ycTpoifcTBO, which plays the role of a differential broadband transformer, an additional flatband transformer must be connected to a known transformer, and this leads to a decrease in the efficiency of the device due to the summation of the power losses in both transformers.

The purpose of the invention is to expand the functionality of a wideband transformer while maintaining an extended operating frequency band.

The goal is achieved by the fact that in a broadband transformer containing a conductor made from 2N in series

connected plots (N is any integer), combined into two multi-wire lines, the first of which contains odd sections of the conductor, and the second one contains its even sections, and another conductor located in the first multi-wire line, the beginning of which is connected to the cond of the first conductor and a common bus bar; two additional conductors are inserted into each of the multi-wire lines, with the end of the first additional conductor of the first multi-wire line connected to the start of the first additional conductor of the second multi-wire hydrochloric line, and the second end of the first additional conductor multiconductor line connected to the beginning of the second additional conductor second multiconductor line.

FIG. 1 shows the electrical circuit of the transformer; in fig. 2 shows an embodiment of a transformer (N 2) using coaxial lines.

The transformer contains conductor 1, made from 2N unbreakable sections 1-1, 1-2 1-3, 1, ..., 1- (2N-1), I-2N (the second digit indicates the sequence number of the conductor section 1), connected to two multi-wire lines 2 and 3. In the first multi-wire line 2, there are areas with odd order numbers 1-1, 1-3, ..., 1 - (2N-1), and in the second - areas with even pores Such numbers are 1-2, 1-4, ..., 1-2N. In the first multi-wire line 2 there is a conductor 4, the beginning of which (the beginnings are indicated by dots) is connected to the end of the conductor (its section 1-2N) 1 and the common bus 5. Two additional conductors 6 and 7 are entered into multi-wire line 2, and 3 - two additional conductors 8 and 9. The end of the conductor 6 is connected to the beginning of the conductor 8, and the end of the conductor 7 is connected to the beginning of the conductor 9. The first pair of inputs 10 and 11, symmetrical with respect to the common bus 5, form: the beginning of the conductor 6 and the end of the conductor 9 - input 10, start of conductor 7 and the end of conductor 8 is input I. Another pair of inputs 12 and 13 of the proposed differential transformer, and input 12 is symmetrical with respect to common bus 5, and input 13 is not symmetrical with respect to common bus 5, form: beginning of conductor 8 and beginning of conductor 9 - input 12, beginning of conductor 1 - input 13.

The wires 6 and 7 are formed by internal conductors of coaxial lines, the external conductors of which are combined along the entire length, constitute conductor 4. The conductors 8 and are made of internal conductors of coaxial lines, the external conductors of which, combined along the entire length, are section 1-4 of the conductor 1 .

924

The device works as follows. Let the oscillation, which is asymmetric with respect to the common bus 5, enter the input 13. The conductors 1-1, 1-2, 1-3 and 1-4 form an autotransformer 1: 2, i.e. between the beginning of the conductor 1-3 and the common bus 5 there is a voltage less than that between the clamps 13 and 5, and having the same polarity. With conductor 4, this voltage is converted to

symmetrical with respect to the common busbar 5 between the end of the conductor 4 and the beginning of the section 1-4 with the polarity noted in FIG. Further, this voltage is divided equally between coaxial lines with internal

guides 6-9. All these lines are assumed to be equal to the wave resistance, and therefore the clips 12 are equipotential and can be considered short-circuited. As a result, equal (half amplitude) voltages flow in lines with internal conductors 6 and 7, 8 and 9, and in the first two lines the voltages between the internal and external conductors are opposite in phase to the voltages between

internal and external conductors in the other two lines. Pass along the lines, the voltage on their output: are summed in pairs and stand out in the loads connected to the pairs of clamps 10 and I, with the marked there

sexuality.

If the wave impedances of all coaxial lines are equal, and the values of the loads at terminals 10 and I are twice their value, then all the lines are matched.

If the signal source is connected to balanced terminals 12, then the voltage at terminals 13 and 5 becomes zero, and the voltage at terminals 10 and 11 varies in phase by 180 ° relative to each other.

Thus, in general, we obtain a matched differential transformer with an unbalanced input and symmetrical transformed outputs. The conductors 1-1 and 1-2 form transforming it

part, and conductors 4-9 - differential winding with symmetrical inputs 10 and 11. The operation of this device is not fundamentally different from that considered. .

As a result, we get a matched balanced differential transformer with an arbitrary integer transformation ratio.

Claims (2)

55 Formula of Invention A broadband transformer containing a conductor made of 2N series-connected sections, combined into two multi-wire lines, the first of which contains odd sections of the conductor, and the second contains its even sections, and another conductor located in the first multi-wire line, the beginning of which is connected to the end the first conductor and the common bus, which is characterized by the fact that, in order to expand the functionality while maintaining the extended working frequency band, each of the multi-wire lines is two additional conductors each, with the end of the first additional conductor first the multi-wire line is connected to the start of the first additional conductor of the second multi-wire line, and the end of the second additional conductor of the first multi-wire line is connected to the beginning of the second additional conductor of the second multi-wire line. Sources of information received in BHKMairae during examination 1, Trans Parts, Mater and Packing, 1968, No. 3, p. 59-66, FIG. 96, 2. USSR author's certificate in application N 2693925, cl. H 01 F 19/04, 1978.