UA73656C2 - Double balanced frequency converter - Google Patents

Abstract

The proposed double balanced frequency converter is distinctive by the large coefficient of frequency conversion and high noise immunity. The converter contains two balanced converting modules that are connected in parallel to each other. The inputs of the converting modules are connected to the secondary winding of the input transformer with a midpoint terminal. The output windings of the converting modules are inductively coupled with a resonance or another load that is selective to a signal frequency. The input signal source is connected to the converter via a matching transformer so that the midpoint terminal of the matching transformer is connected to the midpoint terminal of the input transformer of the converter, and the end terminals are accordingly connected to the midpoint terminals of the output windings of the converting modules.

Description

Description of the invention

The invention relates to radio engineering and can be used in various devices such as: mixers 2 superheterodyne receivers, AM modulators, demodulators, etc., as well as in telephones in multi-channel transmission systems.

The purpose of the invention is to obtain a frequency converter that has a high conversion factor (K pr) even at relatively high input voltages, with high immunity.

A constituent part of the invention is the well-known 710 balance converter from many literary and reference sources, for example:

N.V. Bobriv, G.V. Maksimov, V.I. Michurin, D.P. Mykolaiv "Calculation of radio receivers" M., Voenizdat, 1971 496 pages. on p. 254-259 paragraph Mo7.4. "Calculation of crystal frequency converters". etc. sources

The double balanced parallel frequency converter (BFC) consists of two specially connected balanced frequency converters (BFC) working on their load, strictly in antiphase. 12 The result of the operation of both BPFs is highlighted by the output oscillating circuit (see drawing.).

The combination of two RFCs in a similar way acquires qualitative differences: it significantly increases the K pr of the device, which is proven by the fact that the frequency conversion in the PBRFC occurs almost continuously, except for the moments of the period of oscillations of the source of the converting signal (DPS), when the voltage of the DPS passes through zero, more precisely from the closing point of the diodes of one BPF to the opening point of the diodes of the other BPF. Thus, in contrast to BPH in

In PBRP, the converted signal is added not with a half-wave of the DPS, but with a whole wave, which provides two-stroke frequency conversion. In addition, due to the fact that all the diodes of the converter are connected in the same way to the input transformer, i.e. either anodes or cathodes, the conversion in them takes place on the same section of the diode characteristic, which reduces losses during conversion to a minimum.

In the conducted tests, the PBRPCH compared to the ring converter showed a significant improvement in technical characteristics. So the PBRPCH works stably to relatively high voltages of the converted signal, more than Ge) of one volt, limited reduction of Kr and DPS voltage. It is also possible to note the high immunity due to the fact that the interference, like the input signal being converted, of a large amplitude does not lead to a disturbance in the operation of the PBRRPCH, and is also converted by frequency.

Description of the PBRPCH design: The converter consists of four diodes 1,2,3,4, two transformers 5,6. eh

Transformers 5, 6 are input, 5 is used to supply the input (transformed) signal. b is used to supply the DPS conversion signal to the diodes. 7 - output oscillating circuit (see drawing). eh

List of drawing figures: 1,2,3,4 - diodes 55,6 - input transformers; 7 - output oscillating circuit so 710 - capacity of the oscillating circuit; 11,13 - winding ends of transformer 5; 12 - the middle point of the transformer 39 5; 2022 - ends of transformer winding 6; 21 - the middle point of the transformer 6; 14,16 and 17,19 - ends in the winding (coil of communication) of the output oscillating circuit 7; 15,18 - middle points of the windings (coils of communication) of the output oscillating circuit 7; 23,24 - ends of the output winding of transformer 7; 8 - source of converted signal; 9 - the source of the converting signal (DPS). "

Requirements for elements: diodes 1, 2, C, 4 should preferably have close parameters. From 50 Transformer data: from 5: all three windings are wound symmetrically.

From" 6: windings 20-21 and 21-22 are wound symmetrically. The winding, which is connected to the DPS, is wound separately. 7: windings (communication coils) 14-15, 15-16 and 17-18, 18-19 are wound symmetrically, the output winding 23-24 is wound separately.

The number of turns of transformers and the inductance of transformer cores depends on the range of 7 operating frequencies of the converter. The rest of the requirements are similar to the requirements for creating similar devices.

The PBRPCH consists of two BPFs. The first BPF has a common transformer 5 with the second BPF. Diodes 1 and Z b of the first BPF are connected to the ends 11 and 13 of the winding of the transformer 5, the other ends of the diodes are connected to the ends of sl 20 14 and 16 of the first winding (communication coil) of the oscillating circuit 7. Diodes of the second BPF 2 and 4 are also connected to the ends 11 and 13 of the transformer 5, the other ends of the diodes are connected to the ends 17 and 19 of the second winding (communication coil) of the oscillating circuit 7. The oscillating circuit 7 is formed by the inductance of the winding with the ends 23 and 24 and the capacitance 10. The ends 20 and 22 of the winding of the transformer 6, which 22 is connected to the DPS, are connected to the middle point 15 of the winding (communication coil) 14-16 and to the middle point 18 of the winding (communication coil) 17-19 of the oscillating circuit 7. Midpoints 21 of transformer 6 and 12 of transformer 5 are connected. Everyone's direction

GF) of four diodes can be reversed.

Through the winding 11-13 of the transformer 5, the converted signal is constantly supplied. Diodes 1 and Z o are opened by DPS when the current flows in the winding 20-21 of transformer 6 in the direction from terminal 21 to terminal 20 (with generally accepted: the movement of electrons from "-" to "-7. From the input transformer 5 through the open diodes at 60 a signal that is converted passes through the winding (communication coil) 14-16 of the oscillating circuit 7. Diodes 2 and 4 at this time are closed by the voltage of the windings 21-22 of the transformer b because on terminal 22 ---, on terminal 21 -"-".

Passage of the converted signal through the closed diodes 2 and 4 does not occur. Diodes 1 and C close

DPS when on the terminals of winding 20-21 of transformer 6 the voltage on terminal 20 is -"-", on terminal 21 --"7. In this case, the passage of the converted signal through diodes 1 and Z from transformer 5 to the winding (the coil of connection) 14-16 of the oscillating circuit 7 does not occur. Diodes 2 and 4 at this time are open by the DPS current: in the winding

21-22 of transformer 6, the current flows from terminal 21 to terminal 22. Through the open diodes from the input transformer to the winding (coil of communication) 17-19 of the oscillating circuit 7, the converted signal passes. During operation, the DPS opens diodes 1,3, closes 2, 4, then on the contrary opens 2 4 closes 1,3. The results of operation 5 of both BPFs on the windings (communication coils) 14-16 and 17-19 are composed in the magnetic core and isolated by the output oscillating circuit 7.

Technical characteristics of PBRPCH

The input resistance is low...........hhennnnnnnnnnnnnnniii: tens of ohms

The output resistance is large...........khnnnnnyo and tens of thousands of Ω 70 The input voltage of the DPS at the ends of the winding 20-22 of the transformer 6..........2.. FROM 0.6 Volt doi1 ,3 Volts

Input voltage of the converted signal, limited by diode noise (1.2 decibels)..from - 0.0000001 Volt to 1.0 Volt

Coeur power conversion factor.......less than or equal to 0.8

The conversion factor when the value of the input converted signal (Ovx) is equal to 1 Volt in power ......... is less than or equal to 0.4

Tested upper frequency (due to lack of higher frequency transformer cores)... 190 million Hertz

The signal voltage with the frequency on which the oscillating circuit 7 is built, applied to the input of the PBRP, is absent at the output.

There is practically no DPS radiation everywhere at the entrance and exit of the PBRPCH.

The PBRPCH is comprehensively tested and works stably as a frequency converter in the all-wave receiver in the range of 0.15-20 million Hertz and in the VHF receiver in the range of 63-73 million Hertz and in the range of 88-110 million Hertz. 7 s; y" o 8 KI z" yen 4 z (Se) y, y oy zy s" y y ry so 6 y s y y y" Fig. -and

Claims (1)

The formula of the invention Ф Double balanced parallel frequency converter (PBRCF), consisting of two balanced frequency converters (BRCs), which is distinguished by the fact that the inputs to its composition of the RRCs are connected with inputs s 20 in parallel to the secondary winding of the input transformer, which has a middle point, and their outputs Ф windings, which also have middle points, inductively connected to output resonant or any other selective output loads, while the voltage of the source of the converting signal (DPS) is connected by the middle point of the matching transformer to the middle point of the secondary winding of the input transformer, and the ends - to the middle points of the output windings of each BPF. GF) Official Bulletin "Industrial Property". Book 1 "Inventions, useful models, topographies of integrated microcircuits", 2005, M 8, 15.08.2005. State Department of Intellectual Property of the Ministry of Education and Science of Ukraine. 60 b5