SU663045A1

SU663045A1 - Self-sustained series inverter

Info

Publication number: SU663045A1
Application number: SU762426326A
Authority: SU
Inventors: Виктор Васильевич Шипицын; Владислав Игоревич Лузгин; Алексей Алексеевич Новиков; Виктор Владимирович Рудный; Андрей Александрович Рухман; Леонид Григорьевич Гаев; Валентина Николаевна Антонова; Василий Андреевич Самородов
Original assignee: Уральский ордена Трудового Красного Знамени политехнический институт им. С.М.Кирова
Priority date: 1976-12-06
Filing date: 1976-12-06
Publication date: 1979-05-15

Description

1one

Изобретение относитс к преобразовательной технике и может быть использовано, например, в установках дл индукционного нагрева металлов.The invention relates to a converter technique and can be used, for example, in installations for the induction heating of metals.

Известны автономные последовательные инверторы, содержащие два вентильных моста , св занных с входными выводами по цепи посто нного тока через фильтровые дроссели 1 .Autonomous serial inverters are known, containing two valve bridges connected to input terminals along a direct current circuit through filter chokes 1.

Наиболее близким к изобретению по технической сущности вл етс автономный последовательный инвертор, содержащий два вентильных моста, а также фильтровые дроссели и конденсаторы 2. Недостатком такого инвертора вл етс зависимость напр жени от величины эквивалентного сопротивлени нагрузки.The closest to the invention to the technical nature is an autonomous serial inverter containing two valve bridges, as well as filter chokes and capacitors 2. The disadvantage of such an inverter is the dependence of the voltage on the equivalent load resistance.

Цель изобретени - ограничение выходного напр жени инвертора при резких колебани х нагрузки. Это достигаетс тем, что в предлагаемом автономном последовательном инверторе, содержащем первый и второй вентильные мосты, выводы посто нного тока каждого из которых св заны через фильтровые дроссели с соответствующими входными выводами, и два фильтровых конденсатора , первый из которых включен между положительным выводом первого моста и отрицательным выводом второго .моста, а второй - между положительным выводом второго моста и отрицательным выводом первого моста, параллельно первому фильтровому конденсатору подключен дополнительный контур, образованный соединенными последовательно дополнительными первым конденсатором , дросселем и вторым конденсатором , а точки соединени каждого из дополнительных конденсаторов с дополнительным дросселем св заны с соответствующими выводами второго фильтрового конденсатора через дополнительно введенные вентили.The purpose of the invention is to limit the inverter output voltage during sharp fluctuations in load. This is achieved by the fact that in the proposed autonomous serial inverter, containing the first and second valve bridges, the DC terminals of each of which are connected through filter chokes to the corresponding input terminals, and two filter capacitors, the first of which is connected between the positive terminal of the first bridge and the negative terminal of the second bridge, and the second between the positive terminal of the second bridge and the negative terminal of the first bridge, is connected in parallel with the first filter capacitor flax circuit formed connected in series with additional first capacitor, the inductor and the second capacitor and the connection point of each additional capacitor with an additional choke associated with the respective second terminals of the filter capacitor is further introduced through the valves.

На фиг. 1 и 2 дана принципиальна электрическа схема описываемого инвертора.FIG. 1 and 2 are given the electrical circuit of the described inverter.

Claims

The inverter contains forward 1-8 and reverse 9-16 bridge gates, filter chokes 17-20, switching capacitors 21 and 22, switching chokes 23 and 24, additional capacitors 25 and 26, additional choke 27, additional valves 28 and 29, filter capacitors 30 and 31 and load 32. The inverter operates as follows. The inverter valves are unlocked alternately. In the first cycle, valves 1 and 4 are unlocked and a current flows through the circuit: a capacitor. 30 - valve 1 - capacitor 21 - throttle 23 - valve 4 - load 32 - capacitor 30. Then the current flows into non-return valves 9 and 12 (circuit: capacitor 30 - valve 9 - capacitor 21 - choke 23 - valve 12 - load 32 - capacitor 30). In the second cycle, valves 5 and 8, 13 and 16 operate, in the third cycle valves 2 and 3, 10 and I, and in the fourth cycle valves 6 and 7, 14 and 15. In the future, the processes are repeated. When the voltage on the load 32 reaches the voltage supply source voltage, the additional valves 28 and 29 are opened. At the same time, the bridge current in the first cycle flows through the circuit: valve 1-capacitor 21 - choke 23 - valve 4 - valve 28 - capacitor 25 - valve 1, in the second cycle - in the loop: valve 5 - condenser 22 - throttle 24 - valve 8 - condenser 26 - valve 29. Further processes proceed similarly. Thus, at the time of unlocking the valves 28 and 29, the excess energy stored in the load oscillatory circuit is discharged into the filter The capacitor is charged to full voltage, the inverter bridge current is closed in addition to the load circuit. In this case, the voltage is limited at the load level equal to half of the supply voltage and higher (depending on the angle of the valves 28 and 29), due to the connection according to the load voltage of additional capacitors 26 and 25 charged to half of the supply voltage, which ensures the normal switching of the inverter bridge gates. When the frequency control of the inverter may require a more effective voltage limiting. FIG. Figure 2 shows an inverter circuit in which the output voltage is limited to a level equal to a quarter of the value of the supply voltage. Thus, the introduction of additional circuits and valves allows restriction. output voltage of the inverter with sharp fluctuations in load. Claims of the invention A stand-alone serial inverter comprising first and second valve bridges, each of the direct current terminals of which are connected through filter chokes to corresponding input terminals, and two filter capacitors, the first of which is connected between the positive terminal of the first bridge and the negative terminal of the second bridge, and the second between the positive output of the second bridge and the negative output of the first bridge, characterized in that, in order to limit the output voltage during sharp fluctuations Loading the parallel to the first capacitor of the filter is connected an additional circuit formed connected in series with additional first capacitor drsselem and the second capacitor, and the connection point of each additional capacitor with an additional choke associated with the respective second terminals of the filter capacitor is further introduced through the valves. Sources of information taken into account during the examination 1. USSR author's certificate No. 286043, cl. H 02 M 7/48, 11.29.69.

2. USSR author's certificate number 486439, cl. N. 02 M 7/537, 10.09.71.