SU1711309A1 - Self-excited inverter - Google Patents

Abstract

The invention relates to a converter technique and can be used as a power source for electrothermal and ultrasonic installations. The aim of the invention is to expand the range of regulation. The device contains two consecutive circuits consisting of droplets 1, 2 filters, commuting droplets 3, 4 and cells of the connected anti-parallel thyristor 5, 6 and diode 7,8. The switching capacitors 9, 10 are connected to the connection points of chokes 1.3 and 2.4. The thyristor cathodes 5,6 are connected through a load to each other, through additional filter chokes 12,13 with a negative input terminal. Filter inductors 1,2, 12, 13 are magnetically coupled. 2 Il.

Description

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The invention relates to a converter technique and can be used as a power source for electrothermal and ultrasonic installations.

The purpose of the invention is to expand the range of adjustment of the output electrical parameters.

Figure 1 is a circuit diagram of an autonomous inverter; , FIG. 2 shows timing diagrams explaining his work.

A stand-alone inverter (FIG. 1) contains, connected to a positive input terminal, two successive circuits., Consisting, each, of the throttles of the filter 1 (2), the commutating throttle 3 (4) and the cells of the connected anti-parallel thyristor 5 (b) and diode 7 (8), switching capacitors 9 and 10 connected to the connection points of filter chokes and switching chokes of the respective circuits and to the cathodes of opposite thyristors, the cathodes of the thyristors of the circuits are connected through output terminals 11 to one another and through additional Rosseli filters 12 and 13 to the negative input terminal.

Autonomous inverter works as follows.

The total cycle (period) is determined by the operation of the thyristors of both successive circuits. When the thyristor 5 is unlocked, the switching capacitor 9 oscillates across the circuit: 9-3-5-11-9. At the same time, a current of the same direction flows through the circuit: 10-11-8-4-10. The currents of the circuits are added to the load 11. After recharging the capacitor 10, the diode 8 turns off. When the current of the circuit is 9-3-511-9 to zero, the thyristor 5 is turned off and the reverse recharging of the switching capacitor 9 goes along the circuit: 9-11-7-3-9. At the same time, the thyristor 6 is turned on and the capacitor 10 is recharged along the circuit: 10-4-6-11-10. The currents of the circuits also add up to the load 11. From the moment of unlocking the thyristor 6, the current through the load 11 flows in the opposite direction compared to the current flowing during the operation of the thyristor 5.

Next, the diode 7 is turned off, and then the thyristor 6. When the thyristor 6 is turned off, the operation cycle ends. The next beat starts from the moment

switching on the thyristor 6 and diode 8. The electromagnetic processes in the inverter are repeated. Figure 2 shows the diagrams (first and second diagrams) of the control current (1y) thyristor pulses and the load current (1c) in the unregulated mode. The phase shift ъ between the moments of the supply of control pulses to thyristors 5 and 6 is 180 el. hail. (l) The moment of switching off the diodes in this mode 7 and 8 are indicated by ta. tf, ts.

When adjusting the output parameter, the phase shift between the switching points of the thyristors 5 and 6 changes in

in the range from joint conductance of thyristors 5 and b, the difference in discharge currents of switching capacitors 9 and 10 flows through the load 11. As a result, the current through the load

11 decreases. 2, a third (iy) and a fourth (in) diagrams are an illustration of the mode.

The implementation of filter chokes 1, 2, 12 and 13 of the magnetically coupled one allows to reduce the exchange circulation currents in the circuit, to ensure a high level of output power in the nominal mode, and to reduce the weight and size parameters of the adjustable inverter.

Claims (1)

Invention Formula A self-contained inverter containing two successive circuits connected to a positive input terminal, each consisting of filter throttles, a switching throttle and cells from a thyristor and a diode connected in opposite directions, two switching capacitors connected by first leads to the connection points of the filter chokes and switching chokes of the corresponding circuits, in order to expand the range of regulation, the cathodes of the thyristors of the cells are connected via output terminals, and through the additional The filter chokes are connected to the negative input terminal, the second output of the switching capacitor connected to the first circuit is connected to the thyristor cathode of the second circuit, and the second output of the switching capacitor connected to the second circuit is connected to the thyristor cathode of the first circuit, and all filter chokes are made tied Fi.2