SU1289633A1 - High-voltage thyristorized generator for electro-erosion working - Google Patents

Abstract

The invention relates to the electrical discharge machining of metals and can be used in a pulsed technique to form powerful current pulses. The purpose of the invention is to increase the efficiency and stability of the output parameters by introducing two capacitors 5 and 6 and corresponding functional connections into the generator. The generator also contains power sources 1 and 2, an inverter on thyristors 3 and 4, storage capacitors 7, 11 and 13, inductance 8 and 9, diodes 10 and 12, output terminals 14 and 15. increase the quality of processing by 30%. 1 il. (L e - VCh1D th CD Oi OO CO; 4 7

Description

The invention relates to the electrical discharge machining of metals and can be used in a pulsed technique to form powerful current pulses.

The aim of the invention is to increase the efficiency and stability of the output parameters.

The drawing shows an electrical circuit of a high-voltage thyristor generator.

The generator consists of sources 1 and 2 of power, a series inverter on thyristors 3 and 4 with storage capacitors 5, 6, 7 and inductances 8 and 9. The cathode of thyristor 3 is connected to the anode of thyristor 4 through series-connected capacitors 5 and 6, the anode of thyristor 3 through inductance 8 is connected to the positive pole of source 1, the cathode of thyristor 4 through inductance 9 is connected to the negative pole of source 2. The positive pole of source 2 is connected to the negative pole of source 1 and the first plate of the capacitor 7, the second the plate is connected to the junction point of capacitors 5 and 6. The cathode of thyristor 3 is connected to the anode of diode 10, the cathode of diode 10 through capacitor 11 is connected to the negative pole of power supply 1. The anode 25 of the thyristor 4 is connected to the cathode of the diode 12, the anode of the diode 12 through the capacitor 13 is connected to the positive pole of the source 2. The output terminal is connected to the cathode of the diode 10

a small negative voltage is applied or the thyristors are not unlocked when the pulse is applied.

When a discharge occurs in the erosion gap, the capacitors 11 and 13 are times 5 times. In this case, the sum of the voltages on the capacitors 11 and 13 is applied to the erosion gap, which ensures the formation of a powerful current pulse. When capacitors 1 and 13 are discharged, storage capacitors 5 and 6 are also discharged by an erosion gap.

The circuit does not consume current at idle, its economic performance increases by 1.5-2 times, due to the absence of galvanic connection between the diodes 10 and 12

15 ensures the absence of a constant component voltage, the process of electroerosive processing proceeds stably, the quality of processing increases by 30%.

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Claims (1)

Invention Formula A high-voltage thyristor generator for EDM, containing two thyristors, two inductances, a first power source connected by a positive bus to a negative bus of a second power source and the first plates of three storage capacitors, the second plate of the first storage capacitor connected to the cathode of the first diode and the first output terminal. 14, and to the anode of the diode 12 output terminal 15. The device operates as follows, the second facing of the second cumulative one. In idle mode, the erosion capacitor is connected to the anode of the first gap connected to the output diode and to the second output terminal, terminals 14 and 15, is open. When replying that, in order to increase the injury of the thyristor 3, the capacitors 5 and 7 are stable and the output parameters are stable, the fourth and fifth capacitors 11 are simultaneously charged to the generator. Then the thyristor 4.35 is unlocked capacitors, capacitors 5 and 13 are charged by the first plates while capacitors 5 and 11 are recharged when thyristor 3 is turned on again, and capacitors 6 and 13 are recharged when thyristor 4 is switched on again. The process is repeated until the capacitors 5 and 6 are charged to a voltage equal to or greater than the voltage difference across the storage capacitor 7 and the power sources 1 and 2. In this case, thyristors 3 and 4 are not applied to 40 45 With the second plate of the third storage capacitor, the second plate of the fourth capacitor is connected to the anode of the first diode and the cathode of the first thyristor, the anode of which is connected via the first inductance to the positive bus of the first power supply, to the second plate of the fifth capacitor, to the second diode, whose cathode is connected via a second inductance to the negative bus of the second power source. 25 a small negative voltage is applied or the thyristors are not unlocked when the pulse is applied. When a discharge occurs in the erosion gap, the capacitors 11 and 13 are times 5 times. In this case, the sum of the voltages on the capacitors 11 and 13 is applied to the erosion gap, which ensures the formation of a powerful current pulse. When capacitors 1 and 13 are discharged, storage capacitors 5 and 6 are also discharged by an erosion gap. The circuit does not consume current at idle, its economic performance increases by 1.5-2 times, due to the absence of galvanic connection between the diodes 10 and 12 15 ensures the absence of a constant component voltage, the process of electroerosive processing proceeds stably, the quality of processing increases by 30%. Invention Formula A high-voltage thyristor generator for EDM, containing two thyristors, two inductances, a first power source connected by a positive bus to a negative bus of a second power source and the first plates of three storage capacitors, the second plate of the first storage capacitor connected to the cathode of the first diode and the first output terminal. The second plate of the second storage capacitor is connected to the anode of the first diode and to the second output terminal, which is different in that, in order to increase the efficiency and stability of the output parameters, the fourth and fifth capacitors are inserted into the generator, the first cover of the second storage capacitor is connected to the generator the anode of the first diode and the second output terminal, which is different in that, in order to increase the efficiency and stability of the output parameters, the fourth and fifth capacitors are inserted into the generator, E is connected With the second plate of the third storage capacitor, the second plate of the fourth capacitor is connected to the anode of the first diode and the cathode of the first thyristor, the anode of which is connected via the first inductance to the positive bus of the first power supply, to the second plate of the fifth capacitor, to the second diode, whose cathode is connected via a second inductance to the negative bus of the second power source.