SU936303A1

SU936303A1 - Single-phase inverter

Info

Publication number: SU936303A1
Application number: SU802973630A
Authority: SU
Inventors: Муса Магеррам Оглы Атаев; Сергей Вазгенович Мкртычев; Рафаэль Каренович Пахлавуни
Original assignee: Азербайджанский Научно-Исследовательский Электротехнический Институт
Priority date: 1980-08-15
Filing date: 1980-08-15
Publication date: 1982-06-15

Description

Изобретение относится к преобразовательной технике и может быть использовано в качестве стабилизированного источника питания.The invention relates to a conversion technique and can be used as a stabilized power source.

Известен мостовой инвертор, выполненный на полупроводниковых ключах с обратными диодами и содержащий выходной трансформатор, первичная обмотка которого снабжена средним выводом, с которым связан упоавляемый ₁ключ р].Known bridge inverter made on semiconductor switches with reverse diodes and containing an output transformer, the primary winding of which is equipped with a middle terminal, which is connected to the specified ₁ key p].

Однако такой инвертоо имеет ограниченный предел регулирования выходного напряжения.However, such an inverto has a limited output voltage control limit.

Наиболее близким по технической сущности к изобретению является однофазный инвертор, содержащий мост из переключающих элементов - тиристоров , в диагональ_: переменного тока которого включена первичная обмотка трансформатора, имеющая отпайку от середины, а также коммутирующий транзистор, базовая цепь которого свя2 зана с блоком управления, а переход коллектор - эмиттер подключен к отпайке трансформатора и одному из выходов постоянного тока моста [2].The closest in technical essence to the invention is a single-phase inverter containing a bridge of switching elements - thyristors, in the diagonal _: AC of which the primary winding of the transformer is included, having a soldering from the middle, and also a switching transistor, the base circuit of which is connected to the control unit, and the collector – emitter junction is connected to the tap of the transformer and one of the bridge DC outputs [2].

Недостатком этого инвертора является ограниченный диапазон регулирования выходного напряжения, обусловленный подключением коммутирующего транзистора к средней отпайке первичной обмотки трансформатора.The disadvantage of this inverter is the limited range of regulation of the output voltage due to the connection of the switching transistor to the average tap of the primary winding of the transformer.

Цель изобретения - расширение диапазона регулирования напряжения.The purpose of the invention is the expansion of the range of voltage regulation.

Поставленная цель достигается тем, что однофазный инвертор, содержащий преобразовательный мост на -пиристорах, диагональ’постоянного тока которого подключена к входным выводам, и выходной трансформатор, крайние выводы первичной обмотки которогб подключены к диагонали переменного тока моста, а промежуточный вывод Через коммутирующий транзистор к одному входному выводу, введен допол нительный коммутирующий транзистор, включенный между промежуточным выводом первичной обмотки трансформатора и другим входным выводом.This goal is achieved by the fact that a single-phase inverter containing a converter bridge on-pyristors, a constant current diagonal of which is connected to the input terminals, and an output transformer, the extreme ends of the primary winding of which are connected to the alternating current diagonal of the bridge, and the intermediate output through a switching transistor to one input terminal, an additional switching transistor is introduced, connected between the intermediate terminal of the transformer primary winding and another input terminal.

Промежуточный вывод может быть 5 выполнен смещенным относительно середины обмотки.The intermediate terminal may be 5 offset relative to the middle of the winding.

На фиг. 1 приведена схема однофазного инвертора, на фиг. 2 - временные диаграммы его работы. ίο ' Однофазный инвертор содержит тиристоры 1-4, соединенные с концами 5 и 6 первичной обмотки 7 трансформатора 8, а также коммутирующие транзисторы 9 и 10, выводы которых подключе-15 ны к смещенной от середины отпайки 11 первичной обмотки 7 трансформатора 8 и к разнополярным входным выводам.In FIG. 1 is a diagram of a single-phase inverter, FIG. 2 - time diagrams of his work. ίο 'A single-phase inverter contains thyristors 1-4 connected to the ends 5 and 6 of the primary winding 7 of the transformer 8, as well as switching transistors 9 and 10, the conclusions of which are connected to the primary winding 7 of the transformer 8, which is offset from the middle of the tap, and to the multipolar input pins.

Однофазный инвертор работает'следующим образом. 20A single-phase inverter operates as follows. 20

При включении тиристоров 1 и 4 к первичной обмотке 7 трансформатора 8 прикладывается напряжение источника питания (фиг. 2). Затем подается сигнал от блока управления на вклю- 25 чение транзистора 10. Транзистор 10 включается и напряжение источника прикладывается к меньшей части первичной обмотки 7 трансформатора 8. В результате этого к тиристору 4 зд прикладывается обратное напряжение, и он выключается. При работе тиристоров 2 и 3 выключение тиристора 3 происходит в момент подачи управляющего сигнала на базу коммутирующего ₃₅транзистора 9.When thyristors 1 and 4 are turned on, the voltage of the power supply is applied to the primary winding 7 of the transformer 8 (Fig. 2). Then, a signal is supplied from the control unit to turn on transistor 10. Transistor 10 is turned on and the voltage of the source is applied to a smaller part of the primary winding 7 of transformer 8. As a result, reverse voltage is applied to thyristor 4 rear and it turns off. When the thyristors 2 and 3 are turned off, the thyristor 3 is turned off when the control signal is applied to the base of the switching transistor ₃₅ .

Такое выполнение инвертора созда ет возможность регулирования в широ ких пределах и обеспечивает поддер жание в цепи нагрузки его стабильности.Such an inverter design makes it possible to control over a wide range and ensures its stability in the load circuit.

Среднее значение выходного напряжения регулируется изменением момента включения транзисторов 9 и 10, а также положением отпайки первичной обмотки 7 трансформатора 8.The average value of the output voltage is regulated by changing the moment of switching on transistors 9 and 10, as well as the soldering position of the primary winding 7 of the transformer 8.

Claims

The invention relates to a conversion technique and can be used as a stabilized power source. A bridge inverter is known, which is made on semiconductor switches with reverse diodes and contains an output transformer, the primary of which is equipped with an average output, with which the controlled key 1 is connected. However, such an inverter has a limited output voltage control limit. The closest in technical essence to the invention is a single-phase inverter containing a bridge of switching elements - thyristors f to the diagonal: the current of which is connected, the primary winding of the transformer, having a tap from the middle, as well as a switching transistor, the basic circuit of which is connected to the control unit and the collector-emitter junction is connected to the tap of the transformer and one of the direct current outputs of the bridge f2j. The disadvantage of this inverter is the limited range of output voltage regulation, due to the connection of the switching transistor to the middle tap of the primary winding of the transformer. The purpose of the invention is to expand the range of voltage regulation. The goal is achieved by the fact that a single-phase inverter containing a converter bridge on α-pyristors, whose DC diagonal is connected to the input terminals, and an output transformer, the extreme terminals of the primary winding of which are connected to the diagonal of the bridge AC, and the intermediate output through the switching transistor to one input terminal, introduced an additional switching transistor, connected between the intermediate terminal of the transformer primary winding and another input terminal. The intermediate lead may be made offset from the winding core. FIG. 1 is a diagram of a single-phase inverter; FIG. 2 - time diagrams of his work. The single-phase inverter contains thyristors 1-C connected to ends 5 and 6 of the primary winding 7 of transformer 8, as well as switching transistors 9 and 10, the terminals of which are connected to the primary winding 7 of the transformer 8 displaced from the middle of the tap of the primary winding 7 and 10 . Single-phase inverts p works as follows. When the thyristors 1 are turned on and the primary winding 7 of the transformer 8, a supply voltage is applied (Fig. 2). A signal is then supplied from the control unit to turn on the transistor 10. Transistor 10 is turned on and the source voltage is applied to a smaller part of the primary winding 7 of the transformer 8. As a result, a reverse voltage is applied to the thyristor / and it turns off. When thyristors 2 and 3 are in operation, the thyristor 3 is turned off at the moment when the control signal is applied to the base of the switching transistor 9. Such an embodiment of the inverter creates the possibility of regulating within wide limits and provides support in the load circuit for its stability. The average value of the output voltage is regulated by changing the switching on moment of the transistors 9 and 10, as well as the tap position of the primary winding 7 of the transformer 8. The invention 1. The single-phase inverter containing a converter bridge on the thyristors, the DC diagonal of which is connected to the input terminals, and the output transformer whose extreme terminals of the primary winding of which are connected to the diagonal of the alternating current of the bridge, and the intermediate terminal through the switching transistor to the same input terminal, which differs That, in order to expand the range of regulation of the output voltage, an additional switching transistor is inserted in it, which is connected between the intermediate terminal of the transformer primary winding and another input terminal. 2. The inverter according to claim 1, in accordance with the fact that the intermediate terminal is made offset from the middle of the winding. Sources of information taken into account in the examination 1. USSR author's certificate number, cl. H 02 M 7/537, 1977.

2. USSR author's certificate number 637933, cl. H 02 M 7/515, 1975.

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