SU1287253A1 - Generator of homopolar current pulses for supplying power to n-loads - Google Patents

Abstract

The invention relates to the field of pulsed technology. It can be used in EDM installations for piercing a large number of holes. The aim of the invention is to simplify the device by reducing the number of elements used, including thyristors and diodes. To achieve this goal, new functional connections are formed in the device. 2 Il.

Description

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The invention relates to a pulse technique and can be used in electrical erosion machining installations of metafields for piercing a large number of holes.

The aim of the invention is to simplify the device by reducing the number of elements used, including thyristors and diodes.

Fig. 1 is a circuit diagram of a generator for supplying, for example, three loads; 2 shows time diagrams of currents (voltages).

The generator (Fig. 1) contains thyristors 1-8 of the first bridge with switching capacitor 9, the first inductors 10–12, connected in series with loads (inter-electronic software between intervals) 13–15, respectively, the first diodes 16–18, connected in opposite directions successive circuits: choke 12 - load 15, choke 11 - load 14 and choke 10 load 13, respectively.

The thyristors 2i355i6, 7i8 of the cathode group of the first bridge form pairs with combined cathodes that are connected to throttles 12, 11, and 10, respectively. The second diodes 19 and 20 are connected in the opposite direction between the point of connection of loads 13 - I5 and the common anode terminals of thyristors 2, 5, 7 and 3, 6, 8, respectively. The third diode 21 is connected to the zag circuit of the storage capacitor 22, which is connected to the loads 15-13 through the second thyristor bridges 23-25, respectively. A second choke 27 is connected in series with the source 26 of constant voltage.

In steady state, the generator operates as follows.

At time tj (Fig. 2), the thyristors 1 and 3 are turned on and at the same time the corresponding thyristors of the bridge 23j, while the capacitors 9 and 22 are charged with the polarity shown in Fig. 1c. As a result, the igniting part of the output pulse is formed due to the discharge of the capacitor 22 and, in addition, the oscillating current of the recharge of the capacitor 9 flows through the load 15 and closes in the circuit: thyristor 3, choke 12, load 15, diode 19, capacitor 9. After the diode I9 closes, the capacitor 9 continues to recharge to reverse 5

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the polarity of the current flowing from source 26 through choke 27 and thyristors 1 and 3. At time t, thyristors 2 and 4 turn on and after switching the current from thyristors 1 and 3 to thyristors 2 and 4, the oscillating current flows through the circuit: thyristor 2, choke 12, the load 15, the diode 20, the capacitor 9. This completes the formation of the pulse on the load 15. If it is not necessary to obtain more pulses, the thyristors 1, 3 and 2, 4 are turned on the required number of times.

Further, at time t, the thyristors of the bridge 24 and the thyristors 1 and 6 are turned on and the formation of a pulse begins at the load 14. In this case, the process is similar to that described. At time t, a pulse shaping begins at load 13, and the thyristors of the bridge 25 and the thyristors 1 and 8 are switched on.

At the end of the output pulses, the energy accumulated in the throttle x 10-.12 dissipates in loads 13-15, respectively. At the same time, the current falls off smoothly and closes through diodes 18, 17, and 16, which excludes switching overvoltages on thyristors 1-8.

Claims (1)

Invention Formula Unipolar current pulse generator for power supply, n loads, containing a first thyristor bridge, n-second thyristor bridges, switching capacitors in diagonal x thyristor bridges, n-first diodes, two second diodes, a storage capacitor, a third diode in the circuit charge storage capacitor, n-first chokes and a second choke connected in series to a DC voltage source, characterized in that, for the purpose of simplification, each n-load through a series connected corresponding first The creep bridge, the first thyristor bridge and the second choke are connected to a constant voltage source, each first diode is connected counter-parallel to the corresponding series circuit from the load and the first cable, the cathode group of the first thyristor bridge is made in the form of n thyristor pairs, the common cathode points of which are connected the corresponding first chokes, the second diodes are included in J v v A5 A b A / 7 2