SU936302A1

SU936302A1 - Single-phase inverter

Info

Publication number: SU936302A1
Application number: SU802973462A
Authority: SU
Inventors: Виталий Анатольевич Алфимов; Юрий Васильевич Никитенко
Original assignee: Научно-Производственное Объединение "Энергия" Всесоюзного Производственного Объединения "Союзатомэнерго"
Priority date: 1980-08-11
Filing date: 1980-08-11
Publication date: 1982-06-15

Description

(54) ИНВЕРТОР ТОКА(54) CURRENT INVERTER

1one

Изобретение относитс к преобразовательной технике, а именно к преобра зовател м посто нного напр жени в переменное, выполненным на базе автономного инвертора тока.The invention relates to a converter technique, namely, a DC / DC converter, made on the basis of an autonomous current inverter.

Известны инверторы тока, содержащие сглаживающий дроссель и тиристорный мост. При срыве инвертировани восстановление работы инвертора возможно лишь при отключении питани LUCurrent inverters are known to contain a smoothing choke and a thyristor bridge. In the event of a breakdown of the inversion, the inverter operation can be restored only when the LU power is turned off.

Известен также инвертор тока, в котором дл улучшени условий запуска использован пусковой блок L Наиболее близким по технической сущности к изобретению вл етс инвертор тока, содержащий сглаживающий дроссель, тиристорный мост и пусковой блок, состо щий из коммутирующих тиристора и конденсатора, а также .разр дного резистора, шунтирующего конденсатор З.A current inverter is also known, in which a starting block L is used to improve the starting conditions. The closest to the technical essence of the invention is a current inverter containing a smoothing choke, a thyristor bridge and a starting block consisting of a switching thyristor and a capacitor, as well as resistor, shunt capacitor

Пусковой блок позвол ет осуществить запуск инвертора при включении его в работу. Однако при повторномThe starting block allows the inverter to start up when it is put into operation. However, when repeated

запуске инвертора после срыва инвер- тировани такой пусковой блок практически не может быть применен, так как наличие значительной электромагнитной энергии, запасенной в сглаживающем дросселе, приводит к по влению перенапр жений на коммутирующем конденсаторе . Дл снижени перенапр жений требуетс либо существенное увеличение емкости коммутирующего конto денсатора, либо отключение инвертора перед повторным запуском. В последнем случае врем повторного запуска существенно возрастает, что увеличивает длительность интервала перерыва пита15 ни нагрузки и|1ве ртора.starting the inverter after the breakdown of the inversion, such a starting block practically cannot be used, since the presence of significant electromagnetic energy stored in the smoothing choke leads to the appearance of overvoltages on the switching capacitor. To reduce overvoltages, either a significant increase in the capacity of the switching capacitor or the disconnection of the inverter before restarting is required. In the latter case, the restart time increases significantly, which increases the duration of the break interval of the load and the load.

Целью изобретени вл етс уменьшение интервала перерыва питани нагрузки инвертора путем уменьшени времени повторного запуска.The aim of the invention is to reduce the power supply interruption interval of the inverter by reducing the restart time.

2020

Claims

The goal is achieved by the fact that a current inverter containing a smoothing choke, a thyristor bridge and a starting block consisting of a switching thyristor and a capacitor and a discharge resistor, the switching thyristor and a capacitor are not connected in series and included in the diagonal-constant to-thyristor bridge, and the discharge the resistor is connected in parallel with the switching capacitor. a discharge diode is inserted, a charging resistor is connected to the source of charging voltage, and the discharge resistor is connected to a switching capacitor. The motor is connected via a discharge diode connected in accordance with the switching thyristor, and the source of the charging voltage is connected to the switching capacitor via a charging resistor. As a source of charging voltage, an inverter smoothing choke can be used, connected through an additional charging diode and charging resistor with a switching capacitor. FIG. 1 shows a current inverter circuit using a separate capacitor charge voltage source; in fig. 2 - the same, using the smoothing throttle as a voltage source. The inverter of FIG. 1 is powered from the main power source 1 to which the choke 2 is connected, connected to the thyristor bridge 3. A load C is connected to the output of the bridge, a starting block consisting of the thyristor 5, diode 6, resistor 7, capacitor 8 is connected parallel to the bridge input. A voltage source of 10 is connected to the latter through the charging resistor 9. The control signals are supplied to the thyristors from the control unit 11. In the inverter of FIG. 2, a smoothing drosse / H 2 is used as the source of charge voltage 10, connected to the capacitor 8 through the charging diode 12 and resistor 9. During normal operation of the inverter, the current flows from the power source 1 through the inductor 2, thyristor bridge 3 load 4 The thyristor 5 is then locked, and the capacitor 8 is charged from the voltage source 10. When both thyristors, for example phase A, are simultaneously unlocked, the voltage at the input of the thyristor bridge drops to zero. On this signal, the control unit 11 delivers a trigger pulse to the thyristor 5. The throttle current 2 now flows through the thyristor 5 and the capacitor 8 and the thyristors of the bridge 3 are locked. After the voltage on the capacitor 8 changes sign, the current of the thyristor 5 of the prote ag gpg3 diode 6 and the resistor 7 are sufficiently long to lock the thyristors of bridge 3, the control unit 11 sends starting pulses to the thyristors of bridge 3 and the load 4 is restored. In this case, a reverse voltage is applied to the thyristor 5 and it is locked. When using droplets 2 as a voltage source for charging the capacitor 8 (fig. Z), the charging current flows through the charging resistor 9 and diode 12. The capacitor 8 is charged to the amplitude of the voltage applied to the choke 2. Application of the proposed inverter current reduces the duration of the power interruption during the most common inverter failure to several milliseconds, and also excludes the switching device between the power source and the current inverter from the power supply circuit. Claim 1. Current inverter containing a burned; living choke, thyristor bridge and a starting block consisting of a switching thyristor and a capacitor and a discharge resistor, the switching thyristor and a capacitor connected in series and included in the diagonal of the direct current of the thyristor bridge, and A single resistor is connected in parallel with a switching capacitor, characterized in that, in order to reduce the power supply interruption interval of the inverter load by reducing the restart time, p An illumination diode, a charging resistor and a source of charging voltage, the discharge resistor being connected to a switching capacitor via a discharge diode connected in accordance with the switching voltage and a voltage source connected to the switching capacitor through a charging resistor . 2. The inverter according to claim 1, “about t l and h y and so that, in order to simplify, an additional

A charging diode, and a smoothing choke was used as a source of charging voltage, with one lead of the throttle winding connected to a switching capacitor, and the other through a charging diode to a charging resistor.

Sources of information taken into account in the examination 1. Yu. G. Tolstov. Autonomous current inverters. M., Energie, 1978, p. 57, fig. 2-1 a.

2. In the same place IS pic. 5-7.

3. In the same place 185, fig. 5-3.