SU1437842A1 - A.c. to a.c. voltage converter - Google Patents

Abstract

The invention relates to secondary power sources. The purpose of the invention is to reduce the installed power of the autotransformer. The goal is achieved by introducing an additional adjustment winding 26 and a single-phase bridge on alternating current switches 27, 28, 29 and 30. An additional adjustment winding 26 and a single-phase bridge are connected to the first adjustment winding 5, divided into K sections with (K + 1) thyristor groups 6, 7 and 8, 9, IR of the second adjustment winding, divided into (2p-1) sections with three groups of 2n series-connected thyristors 13-16, 17-20. and 21-24. With a given depth of regulation, this provides a reduction in the power of the adjusting windings while maintaining protection against short-circuited circuits due to one current-limiting link 25. 1 sludge. $

Description

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The invention relates to secondary sources of electron power; in particular, to a converter technology, and can be used in regulated sources of electrical and radio engineering devices for various purposes.

The purpose of the invention is to reduce the installed power of the autotransformer,

In the drawing, an alternating voltage converter in peMeHHoej is shown implemented according to the invention.

The converter contains the autotransformer 1 with the main winding 2, podtyuyuchennoy one pin to the first input. 3 and the first output 4 outputs of the converter, and two adjustment windings о First adjustment winding 5 is divided into K adjustment sections and contains (K + +1) thyristor groups 6 and 7 and 8 and 9, two series-connected thyristors in each group, k the common points of the thyristors are connected to one extreme and intermediate terminals of the first adjustment winding 5, the second adjustment winding is divided into (2p-1) sections 10 11 and 12 with average outputs and contains three groups of thyristors: 13-16, 17-20 and 21 -24, 2n in series, connect. There are no thyristors in each group, the common connection points of the thyristors are connected to the corresponding edges and medium of the second section windings 10, 11 and 12 of the second adjustment winding. The cathode 6 8 and anode 9, 7 terminals of the thyristors of the first adjusting field x 5 are combined with the code Ii 13, 17, and 21 and the anode 16, 20, and 24 terminals of the thyristors of the second adjusting winding, respectively, and the but 25, Additional adjustment winding 26 and an additional single-phase bridge on alternating current switches 27-30 and included in such a way that one of its outputs is connected to the second output terminal of the converter 31, and the other output is connected to the second input output of the former 32 and the second output of the main winding 2 of the autotransformer 1, one bridge input is connected to the common point of the thyristor serial connection

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Noah from the extreme thyristor groups of the first adjusting winding 5, and the other input through an additional adjusting winding 26 is connected to one of the extreme leads of the nth section 11 of the second adjusting winding.

The numbers of turns in the first adjustment winding 5, in 10, 11 and 12 of the second adjustment winding and in the additional adjustment winding 26 are chosen in such a way that their EMFs are related to each other as 9: 2: 4: 2: 2.5. In addition, sections 10, 11 and 12 are divided into equal parts by the middle terminals, where sections 10 are divided into parts, the EMF of the windings of which is 1: 1. In section 11, the average output divides the winding according to 2: 2. In section 12, the average output divides the windings in a 1: 1 ratio.

The variable voltage converter B variable works as follows.

AC voltage is applied to the input pins 3 and 32 of the converter. respectively, the outputs of the main winding 2 of the autotransformer 1. The secures of the first 5 and sections 10, 11 and 12 of the second adjusting windings and the auxiliary winding 26 are applied to the voltage of the corresponding values. Reversing the voltage at the output of converter 4, 31 is performed by connecting sections of the first adjustment winding 5, sections (or parts thereof) 10, 11 and 12 of the second adjustment winding and additional adjustment winding 26 counter or according to the main winding 2 of the autotransformer 1, when certain thyristors 6–9, 13–24 and keys 27–30 of alternating current (syistores) of an additional single-phase bridge.

In order to obtain the minimum output AC voltage, thyristors 8, 9, 14, 15, 21 and 24 and alternating current switches 27 and 30 must be included in the positive half-period of the voltage opposite to the main winding 2 in the first adjustment winding 5, sections 10 and 11 of the second adjustment winding and the additional adjustment winding 26, and in the negative half-period the voltage is opposite to winding 2

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winding 5, section 26.

The next step of the output voltage is implemented by turning on the thyristors 8, 9, 14, 15, 17 and 20 of the keys 27 and 30 of the alternating current, where in the positive half-period of the voltage opposite to the main winding 2 winding 5 is turned on, half of section 10, section 11 and winding 26, and in the negative half period - winding 5, section 11, half of section 12 and winding 26, etc.

The algorithm for turning on thyristors 13-24 for the first nine stages is as follows: the first stage includes thyristors 14, 15, 21 and 24, on the second 15, 14, 17 and 20, on the third - 13, 14, 15 and 16, on the fourth 18 , 19, 21 and 24, on the para - 17, 18, 19 and 20, on the sixth - 13, 16, 18 and 19, on the seventh 21, 22, 23 and 24, on the eighth - 17, 20, 22 and 23 , on virgins - 13, 16, 22 and 23. Thyristors 8 and 9 and keys 27 and 30 are permanently on.

Repeating the algorithm for turning on thyristors 13-24, given above, when turning on the next pair of thyristors .6 and 7 of the first adjusting winding 5 (thyristors 8 and 9 are turned off), the converter allows to realize 18 uniform steps of the output AC voltage with a given quantization step, the output voltage upward. When repeating the turn on algorithms of thyristors 13-24 and thyristors 6 and 7 and 8, 9 but in reverse order, when switching on keys 28 and 29, another 18 uniform steps of the output variable voltage with the same quantization step are realized. The total number of output voltage transducers and converters sold is equal to 36, with a total number of semiconductor devices equal to 20.

All thyristors and alternating current switches of the converter are operated without the use of artificial switching nodes, i.e. in a natural way. In addition, possible short circuits when switching thyristors 6-9 and 13-24, a. also, keys 27-30 AC are limited to one current-limiting link 25.

A variable to variable voltage converter has

U37842

significant advantage and connection with less (1.87 times) the installed capacity of the autotransformer.

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Claims (1)

Invention Formula AC to AC converter containing an autotransformer with a main winding connected by one output to the first input and first output terminals of the converter, and two control windings, the first of which is divided into K serially connected sections and contains K + t groups of thyristors, two in series connected thyristors in each group, the corresponding extreme and intermediate terminals of the sections of the first adjustment winding are connected to the common points of the thyristors, and the second The secondary winding is divided into 2n-1 sections with middle leads and contains three groups of thyristors, .2n of series-connected thyristors in each, common points of connection of thyristors are connected to the corresponding extreme and middle sections of the second adjustment winding, while the cathode and anode outputs of all groups the thyristors of the first adjusting winding are combined respectively with the cathode and anodic outputs of the three groups of thyristors of the second adjusting winding, and between the combined cathodic and anode outputs include However, in order to reduce the installed power of the autotransformer, it is equipped with an additional adjustment winding and an additional single-phase bridge on the AC switches, one output of the bridge is connected to the second output terminal of the converter, the other to the second input output. water converter and the second output of the main winding of the autotransformer, with one bridge input connected to the common point of series-connected thyristors of one of the extreme groups of the first thyristors regulator winding, and the other input of the bridge through an additional adjustment winding is connected to one of the extreme terminals of the n-th section of the second adjustment winding. 0 five 0 five 0