SU997207A1

SU997207A1 - Three-phase inverter

Info

Publication number: SU997207A1
Application number: SU802997193A
Authority: SU
Inventors: Анатолий Евгеньевич Сурминский; Владимир Самойлович Моин
Original assignee: Предприятие П/Я М-5374
Priority date: 1980-10-28
Filing date: 1980-10-28
Publication date: 1983-02-15

Description

Изобретение относитс к электротехнике в частности к силовым преобразовател м энергии, и может найти применение в статических преобразовател х посто нного напр жени в пере- . менное трехфазное приближенно синусоидальной , причем выход инвертора разв зан с источником питани .IThe invention relates to electrical engineering, in particular, to power converters of energy, and may find application in static DC / DC converters. The three-phase voltage is approximately sinusoidal, the output of the inverter being developed with the power source .I

Известен трехфазный инвертор содержащий две трехфазные преобразовательные чейки, выполненные на управл емых ключах, силовые трансформаторы , первичные обмотки которых включены по схеме звезда, а вторичные обмотки каждого трансформатора одной чейки включены последовательно с вторичными обмотками двух трансформаторов другой чейки С ЗНедостатками известного устройства вл ютс переразмеривание габаритной мощности указанных трансформаторов и, в результате, их увеличенные габариты и потери энергда в них. A three-phase inverter is known that contains two three-phase converter cells made on controlled keys, power transformers, the primary windings of which are connected in a star circuit, and the secondary windings of each transformer of one cell are connected in series with the secondary windings of two transformers of the other cell. The residual devices of the known device are re-dimensioned power of these transformers and, as a result, their increased dimensions and energy losses in them.

Наиболее близким к изобретению вл етс трехфазный инвертор, содержащий три однофазные 11реобразовательные чейки, выполненные на управл емых ключах по схеме моста.Closest to the invention is a three-phase inverter containing three single-phase 11-transformation cells, made on controlled keys according to the bridge scheme.

входные вывода которых подключены к входным выводам инвертора, а выходные выводы - к первичным обмоткам основных трансформаторов, вторичные обмотки которых, включенные в звезду , соедшнены последовательно с соответствукицими вторичными обмотками дополнительных трансформаторов, первичные о& 1отки которых св заны The input pins of which are connected to the input pins of the inverter, and the output pins to the primary windings of the main transformers, the secondary windings of which, connected to a star, are connected in series with the corresponding secondary windings of additional transformers, the primary o & 1 currents of which are connected

to с выводами обмоток основных трансфО1 4аторов .to with the findings of the windings of the main transformers.

Недостатками этого инвертора вл ютс болыш1е габариты указанных выходных и дополнительных,транс15 форматс юв и потери энергии в них.The disadvantages of this inverter are the larger dimensions of these output and additional, trans-format and loss of energy in them.

. Цель изобретени - улучшение массогабаритных показателей устройства .. The purpose of the invention is to improve the weight and dimensions of the device.

Поставленнс1Я цель достигаетс The goal is achieved

20 тем, что в трехфазном инверторе первична обмотка каждого из допо ннтельных трансформаторов включена соответственно м&хру разноименными выходными выводами двух смежных в 20 by the fact that in the three-phase inverter the primary winding of each of the auxiliary transformers is connected, respectively, to m & xy by different output terminals of two adjacent

25 пор дке чередовани фаз чеек, а его вторична обмотка соединена встречно с вторичной обмоткой основного трансформатора третьей чейки.25 in order of the phase alternation of the cells, and its secondary winding is connected opposite to the secondary winding of the main transformer of the third cell.

На фиг. )едставлена принципиаль FIG. ) is basic

Claims

30 on the electrical circuit diagram of FIG. 2 - diagrams explaining his work. The device contains controllable keys 1-12, the power circuits of which are shunted by return diodes 13-24, the primary windings of the output transformers 25-27 are connected to the diagonal of the AC variable transformer cells of each of the converter cells, the secondary windings of which are connected in series with the windings of the additional transformers 28 - 30. FIG. 2 shows switching diagrams of keys 1–12 of the respective voltages of the output transformers 25–27, voltages U g – UgoHa of additional transformers 28–30, phase output voltages Id, Ugjo, and Uc; converter, linear output voltage U. The secondary winding of the output transformer 25 of the first cell is connected in series with the secondary winding of the additional transformer 28, the primary winding of which is connected between the output terminal 26 of the second cell, the output voltage of which, according to the diagrams of FIG. is the lagging in phase and opposite output terminal of the third cell, the voltage across which is shifted in phase n & 240, i.e., is leading in relation to output. the voltage of the first converter cell. Similarly, the secondary winding of the output transformer 26 is connected in series with the secondary winding of the auxiliary transformer 29, the primary winding of which is connected between the output terminal of the third converter cell and the opposite output terminal of the first converter cell, and the secondary winding of the output transformer 27 is connected in series with the secondary winding of the additional transformer 30 the primary of which is connected between the output terminal of the first converter cell and the same name m output pin of the SECOND converter cell. The voltage on the windings of transformers 25-30 has the shape of rectangular pulses, the relative duration of which is 30 elgr for the main and 90th for additional transformers. Output phase voltages U to Ujjo Uco have a two-stage form with a relative duration of steps of 30 el. hail. and pause 90 e. hail. When the ratio of the magnitude of the steps, i.e., the transformation ratios of transformers 25-27 n 28-30, respectively VbH AND, the phase output voltages of the inverter exclude 5 and 7 harmonic components, and the linear output voltages have a three-step form with the highest up to the 11th harmonic components, the same as in the prototype. In this technical solution, the relative total capacity of the main and additional transformers is 9% less than in device 2. An additional advantage of this solution is the absence of taps from the primary windings of the main transformers. Claims of the Invention A three-phase inverter comprising three single-phase converter cells made on the controls; eml keys under the bridge scheme, input pins. The holes are connected to the input terminals of the inverter, and the output terminals to the primary windings of the main transformers, the secondary windings of which, connected to the star, are connected in series with the corresponding secondary windings of additional transformers, the primary windings of which are connected to the terminals of the windings of the main transformers, which that, in order to improve the mass and size parameters, the primary winding of each of the additional transformers is connected respectively between opposite output terminals The wires of the two adjacent B phases are interleaved, and its secondary winding is connected opposite to the secondary winding of the main transformer of the third cell. Sources of information taken into account in the examination 1.N.Lovushkin. Transistor voltage converters. M., energy, 1967, p. 59 - 60.

2. Author's certificate of SSS number 560309, cl. H 02 M 7/537, 1975