SU1654954A1 - Self-contained series invertor - Google Patents

Abstract

The invention relates to a converter technique. The purpose of the invention is to improve the energy characteristics while providing the possibility of controlling the frequency in a wide range. The device contains a bridge on thyristors 2 - 5 with switching capacitor 6 and a load 7. A series of two recharge thyristors 8 and 9 is included in the diagonal of the direct current of the thyristor bridge. The midpoint of this chain is connected to the junction point of the switching capacitor 6 and the load 7. Turning on the corresponding thyristors 8 or 9 provides an accelerated recharge of the capacitor 6. 2 Il. (L 3d Ј71 CO SP Ј

Description

FIG. 7

ten

15

20

The invention relates to a converter technique and can be applied in adjustable frequency settings.

The aim of the invention is to improve the energy performance while allowing frequency control in a wide range.

Fig. 6.1 shows a diagram of the power part of the inverter}: on "i. 2 - diagrams of currents i and voltages U, explaining the operation of the inverter.

The power part of the inverter (Fig. 1) contains a choke 1 in the power supply circuit, a thyristor bridge 2-5, in the alternating current diagonal of which a series of switching capacitor 6 is connected and the load 7, between the anode and cathode groups of the bridge, a chain of two overcharges is respectively connected There are 8–9 thyristors, and the middle point of this chain is connected to the junction point of the switching capacitor 6 and the load 7.

In steady state, the inverter operates as follows.

At the beginning of the next cycle of operation of the inverter at the moment of time t (Fig. 2) control pulses r are applied to the thyristors 3 and 4 and the recharge current and the commutation capacitor 6 flows through the circuit 1-4-7-6-3. At the same time, the current through the load 7 flows from right to left, and the time of the switching circuit is constant. It is chosen N times more than 35 compared to the current period of current pulses in the load (N is the adjustment frequency).

At time t opens

25

6 is quickly recharged to 1-8-6-3, and the inverter has set the initial state for the next cycle.

At the beginning of the next cycle of time t $, Tiris 5 opens, the recharge current commutes of the capacitor 6 flows at the end of 2-6-7-5, and the current flows to the load from left to right. I

At time t4, the thyristor 9 is opened, commuting to 6 is quickly recharged to 1-2-6-9 and the status for the next cycle is set.

Time intervals tj - tjj. It is possible to regulate the frequency of the traces of current pulses in the load.

Claims (1)

Invention Formula A sequential autonomous device containing connected | Nym terminals through the throttle generator main thyristors, in the diagonal current of which is included a connected capacitor and a load circuit, which is characterized by the improvement of energy risks while providing frequency control in a wide range, connected by rechargers, connected to a bridge and connected by a common m junction point. thyristor 8, commuting; s capacitor 40 capacitor with a load circuit. 0 five 0 0 5 five 6 is quickly recharged around circuit 1-8-6-3 and the inverter is reset to the next cycle. At the beginning of the next cycle, at time t $, the thyristors 2 and 5 open, the restart current of the switching capacitor 6 flows through the circuit 1-2-6-7-5, and the current in the load 7 flows from left to right. I At time t4, the thyristor 9 opens, the switching capacitor 6 is quickly recharged around the circuit 1-2-6-9 and the initial state is established for the next cycle. Meng time intervals C - t and tj - tjj. It is possible to smoothly control the frequency of the current pulses in the load. The formula is invented and „ A sequential autonomous inverter containing a main thyristor bridge connected to the input- | Nm terminals through a choke, the AC diagonal of which includes a series-connected switching capacitor and a load circuit, characterized in that in order to improve energy performance while allowing frequency control over a wide range , it is equipped with two series-connected recharge thyristors connected in parallel with the bridge and connected by a common point with a connecting point Neni switching con tt it is Puit j h f