SU584413A1

SU584413A1 - Two-phase autonomous inverter

Info

Publication number: SU584413A1
Application number: SU7402072480A
Authority: SU
Inventors: Борис Петрович Шорохов; Вадим Андреевич Кулешов
Original assignee: Чувашский государственный университет им.И.Н.Ульянова
Priority date: 1974-11-01
Filing date: 1974-11-01
Publication date: 1977-12-15

Description

(54) АВТОНОМНЫЙ ДВУХФАЗНЫЙ ИНВЕРТОР(54) AUTONOMOUS TWO-PHASE INVERTER

1one

Изобретение относитс к силовой преобразовательной технике и предназначено дл питани высокоскоростных двухфазных асинхронных микроэлектродвигателей током высокой частоты.The invention relates to power converter technology and is intended to supply high-speed two-phase asynchronous microelectric motors with high frequency current.

Известен автономный двухъ чейковый инвертор , содержащий два тиристорных моста с включенными в диагональ коммутирующими индуктивно-емкостными контурами, обмотки дросселей, концы каждого из которых нодключены между одноименными общими электродами мостов, а средн точка каждого из дросселей подключена к одному из входных зажимов. Такой инвертор может питать одну фазу двзхфазного асинхронного электродвигател , а дл другой фазы еще один такой инвертор. Известен также автономный двухфазный инвертор, содержащий два тиристорных моста с включенными в диагональ конденсаторами со средними выводами, катушки индуктивности со средними точками, концы из которых подключены между одноименными общими электродами мостов, а средн точки каждой из катущек индуктивности подключена к одному из входных выводов . Б случае использовани такого инвертора дл питани двухфазного асинхронного двигател можно питать только одну фазу этого электродвигател , а дл питани другойA self-contained two-cell inverter is known, containing two thyristor bridges with commutating inductance-capacitive circuits included in the diagonal, windings of chokes, the ends of each of which are connected between the same electrodes of the bridges, and the midpoint of each choke is connected to one of the input terminals. Such an inverter can power one phase of a two-phase asynchronous electric motor, and for another phase another such inverter. Also known is an autonomous two-phase inverter containing two thyristor bridges with capacitors included in the diagonal with average leads, inductors with middle points, the ends of which are connected between common electrodes of the same bridge, and the middle points of each of the inductors is connected to one of the input terminals. If such an inverter is used to power a two-phase asynchronous motor, it is possible to power only one phase of this electric motor, and to power the other

фазы электродвигател необходимо примен ть дополнительный блок.motor phase it is necessary to use an additional block.

Целью изобретени вл етс унрощение и уменьщение габаритов. В предложенном инверторе это достигаетс тем, что средние выводы каждого конденсатора подключены к отрицательному входному выводу.The aim of the invention is to improve and reduce overall dimensions. In the proposed inverter, this is achieved by the fact that the average terminals of each capacitor are connected to a negative input terminal.

На фиг. 1 приведена нринципиальна электрическа схема предлол енного инвертора; на фиг. 2 - временные диаграммы токов тиристоров мостов и соответствующих расщепленных обмоток дв)хфазного асинхронного электродвигател .FIG. 1 shows the principle electrical circuit of a pre-expanded inverter; in fig. 2 - time diagrams of currents of thyristors of bridges and corresponding split windings of the two-phase asynchronous electric motor.

Предлол енный инвертор содерлшт восемь тиристоров 1-8, образующих два тиристорных моста, в диагонали которых включены конденсаторы 9-12. одноимеиными общими электродами тиристорных мостов включены расщепленные обмотки 13 н 14 двухфазного асинхронного электродвигател . Половины фазных обмоток включены меладу собой согласно , а их средние точки подключены к выходным . Средние точкн конденсаторов подключены к отрицательному входному зажиму.The predlozhenny inverter contains eight thyristors 1-8, forming two thyristor bridges, in the diagonal of which are included capacitors 9-12. Shared windings 13 and 14 of a two-phase asynchronous electric motor are connected by the same-name common electrodes of the thyristor bridges. Half of the phase windings are switched on by themselves, and their middle points are connected to the output. The middle points of the capacitors are connected to the negative input terminal.

Claims

When the thyristor 1 is unlocked, the charge current flowing through the half of the winding 13, the thyristor 1 and the capacitor 9 forms in the first phase of the motor a field: an effective half-wave of the current. Through 180 el. the hail, the thyristor 3 is unlocked and the charge current of the capacitor 11 forms a negative half-wave of the phase current, since now, unlike the previous case, it is directed to the beginning of the winding. After alternately turning on thyristors 2 and 4, the half-wave current is formed in the same way as when turning on thyristors 1 and

2. Then the thyristor 1 is turned on, and the process is repeated. When forming the half-wave current of the second phase, the thyristor 5 is switched on through 270 el. hail after switching on the thyristor 1. When this happens, the capacitor 9 is recharged and a positive half-wave of current is formed in the winding 14. When the thyristor 7 is unlocked, a negative half-wave of current in the phase winding 14 is formed. and when the thyristors are turned on 5 and 7. In the following, the order of turning on the thyristors is repeated. The currents in the phase windings 13 and 14 of the electric motor are close in shape to a sine wave, since the first half-wave of the oscillatory process current is used, due to the selection of the sequential jRLC-circuit. The use of the proposed autonomous two-phase inverter makes it possible to obtain a relatively simple and compact power source for high-speed two-phase asynchronous microelectric motors. Claims of the Invention A self-contained two-phase inverter comprising two thyristor bridges with capacitors with average leads included in the diagonal, inductors with middle points, the ends of each of which are connected between the common electrodes of the bridges, and the middle point of each of the inductors connected to one of the input terminals characterized in that, in order to simplify and reduce overall dimensions, the average terminals of each of said capacitors are connected to a negative input terminal.