SU771825A1

SU771825A1 - Converter of dc voltage into multi-step phase ac voltage

Info

Publication number: SU771825A1
Application number: SU782691081A
Authority: SU
Inventors: Геннадий Феоктистович Андреев; Эразм Михайлович Гуревич; Валерий Алексеевич Иванов; Владимир Александрович Савин
Original assignee: Предприятие П/Я Г-4514
Priority date: 1978-12-05
Filing date: 1978-12-05
Publication date: 1980-10-15

Description

(54) ПРЕОБРАЗОВАТЕЛЬ ПОСТОЯННОГО НАПРЯЖЕНИЯ В ПЕРЕМЕННОЕ МНОГОСТУПЕНЧАТОЙ ФОРМЫ(54) CONSTANT VOLTAGE CONVERTER TO VARIABLE MULTI-STEP FORM

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Изобретение относитс к преобразовательной технике и может быть использовано при построении вторичных источников электропитани централизованного типа.The invention relates to converter technology and can be used in the construction of secondary power sources of a centralized type.

Известен однофазный преобразователь со ступенчатой формой выходного напр жени , содержащий три однофазных мостовых инвертора, выходные напр жени которых имеют различную длительность паузы на нуле , а суммирование этих напр жений происходит на вторичной стороне выходных трансформаторов 1. Наличие трансформаторов ограничивает применение схемы с понижением частоты выходного напр жени .A single-phase converter with a stepped output voltage is known, containing three single-phase bridge inverters, the output voltages of which have a different pause duration at zero, and the summation of these voltages occurs on the secondary side of the output transformers 1. The presence of transformers limits the application of the circuit with decreasing output voltage frequency wives

Известен однофазный преобразователь со ступенчатой формой выходного напр жени , в котором ступенчатое напр жение получают путем переключени отводов от обмоток трансформатора 2.A single-phase converter with a step form of output voltage is known, in which a step voltage is produced by switching leads from the windings of the transformer 2.

Применение этой схемы ограничено изза наличи трансформатора, частота переключени которого находитс в строгой зависимости от числа ступеней выходного напр жени .The use of this circuit is limited due to the presence of a transformer, the switching frequency of which is strictly dependent on the number of stages of the output voltage.

Наиболее близким к предложенному техническим решением вл етс преобразователь 3, содержащий инвертор, выходомThe closest to the proposed technical solution is a converter 3 containing an inverter, the output

подключенный к первичной обмотке трансформатора , вторична обмотка которого выполнена с промежуточными отводами, которые вместе с одним концом вторичной обмотки через управл емые ключи с двусто- ронней проводимостью соединены в общую точку, а также мост из четырех ключей с двусторонней проводимостью. Силовые входные выводы этого моста подключены к другому концу вторичной обмотки трансформатора и к упом нутой общей точке соединени ключей, а выходные выводы преобразовател образованы другой парой силовых выводов моста.connected to the primary winding of the transformer, the secondary winding of which is made with intermediate taps, which together with one end of the secondary winding are connected to a common point via controlled keys with two-sided conductivity, as well as a bridge of four keys with two-sided conductivity. The power input pins of this bridge are connected to the other end of the secondary winding of the transformer and to the common key connection point, and the output pins of the converter are formed by another pair of power pins of the bridge.

Недостатком данной схемы, вз той за прототип, вл етс относительно больщое количество полупроводниковых элементов, The disadvantage of this circuit, taken as a prototype, is a relatively large number of semiconductor elements,

15 включенных последовательно с нагрузкой, что уменьшает КПД устройства.15 connected in series with the load, which reduces the efficiency of the device.

Цель изобретени - упрощение схемы преобразовател и улучщение его энергетических показателей.The purpose of the invention is to simplify the converter circuit and improve its energy performance.

Поставленна цель достигаетс тем, что The goal is achieved by the fact that

Claims

20 in a DC to AC converter of multi-stage form containing an inverter, the output connected to the primary winding of the transformer. The secondary winding of which is made with intermediate taps connected to a common point through controlled keys with two-way conduction, as well as a bridge of four keys with two-way conductivity, one input terminal connected to one end of the secondary winding, and output terminals forming the output of the converter; according to the invention, the other end of the secondary winding of the transformer is connected to the second input terminal of the bridge, and said common point is connected to one of the output terminals of the converter. FIG. I shows a schematic diagram of the proposed converter; Fig. 2 are time diagrams for explanations of key switching algorithms and output voltage generation; in fig. 3 - key scheme with double-sided conductivity. The converter contains a source of direct voltage 1, controlled switches 2, 3 of direct current, power transformer 4 of an intermediate high-frequency inverter, fully controlled switches 5-10 with two-way conductivity (keys of alternating current), load 11, secondary windings 12-14 . FIG. 2 denotes: and, - the voltage of the first step of you, the travel voltage; 2- - voltage of the second step; ITj is the voltage of the third step; U is the voltage on the primary ctopOKe of the transformer 4 (Fig. 1); 1 / d step voltage on load UF 11 (Fig. 1); J- l / rt) control voltages supplied to fully controlled AC switches 5-10 and in () 1-C half-periods of intermediate high-frequency voltage. The positive level of control voltages and 6 and 10 (Fig. 2) corresponds to the open state of fully controlled AC switches 5-10 (Fig. 1). The fully controlled AC switch (Fig. 3) is made on transistors 15, 16 and diodes 17, 18. The amplitude values of the voltages U (and Us (Fig. 2) are equal to each other and, accordingly, the numbers in windings 12 n 14 (fig. 1). The voltage of the first step U i of the output voltage U 11 (fig. 2) is formed by connecting the load il (fig. 1): in half periods "1 and" 11 (fig. 2. - to the winding 12 through fully controlled alternating current keys 6, 10 (Fig. 1); in half periods "2" and "12 to the winding 14 through alternating current keys 5, 9. The voltage of the sum of two steps U Uj forms Route by connecting to ruks 11: -in half-periods "3 and" 9 - to according to the included windings 12 and 13 through keys 5. 10 AC; -in half-periods "4 and" 10 - to according to the included windings 13 and 14 through keys 6 , 9 AC. The voltage of the sum of the three stages U i, and 2 I is formed by connecting the load II: in half periods "5" and "7" to according to the included windings 12-14 through the keys 7, 10 AC; - in half-periods "6," 8 - to according to the included windings 12-14 through the keys 8, 9 of alternating current. Further shaping of the output voltage occurs in a similar way. Thus, the load current only flows around two fully controlled AC switches (and not three keys, as in the prototype). The proposed converter circuit is easier known and allows to increase the efficiency of the device by 4-6%. Claims of the Inverter DC to AC converter of a multistage form, comprising an inverter, output connected to the primary winding of the transformer, the secondary winding of the color is made with intermediate taps connected to a common point via controlled keys with two-sided conductivity, and also a four-key bridge with two-way conductivity, one input terminal connected to one end of the secondary winding, and the output terminals forming the output of the converter, characterized in that improving energy performance and simplification; the other end of the secondary winding of the transformer is connected to the second input terminal of the bridge, and said common point is connected to one of the output terminals of the transducer. HcToi HHKH information taken into account during the examination I. V. Moin., N. N. Laptev. Stabilized transistor converters. M., “Energie, 1972, p. 145.

2. Lokorgiye N. S. Controlled electric valves and their application. M., “Energy,. 1971, p. 399. 3. Development of transistor secondary power sources. Report on SRW 369/76. No. of State. Register. 77002944. Inv. № Б 616482. Managers: M. Stan N.

3., Mytsyk G.S.M., MEI, 1977, p. 117.

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