SU1697218A1 - Thyristor constant-to-pulse voltage converter for power supply of metal dispersing installations - Google Patents

Abstract

The invention relates to the field of electrical engineering and can be used for the electrophysical treatment of metals. The purpose of the invention is to expand the range of adjustment of the output voltage and increase the stability of the pulsed power consumption. The device contains two capacitive energy storages in the form of capacitors 7, 8, the serial connection of which to the load 14 during one discharge cycle provides the specified value of the pulse energy. Since the device does not contain active energy consumers, except for the load, it provides a wide range of output voltage variation and high efficiency. 2 sludge.

Description

The invention relates to electrical engineering and can be used for electrophysical treatment, for example for electroerosive dispersion of metals.

The aim of the invention is to expand the range of output voltage regulation and increase the stability of the pulsed power consumption.

FIG. Figure 1 shows an electrical circuit diagram of a voltage-to-voltage converter for supplying technological installations for dispersing metals; Fig. 2 is a functional block diagram of control of bit thyristors.

The converter (Fig. 1) contains a series-connected constant-voltage source 1 and a charging choke 2, charging thyristors 3 and 4 and diodes 5 and b, the first 7 and second 8 capacitors, the thyristors 9–12, the choke 13, a load 14 and a control unit 15, wherein the positive bus of source 1 is connected to the first terminal of the charged throttle 2, the second terminal of which is connected to the anodes of the thyristors 3 and 4, the cathodes of which are connected respectively to the common points of connection of the first plate of the first capacitor 7 first weekend off ohm to connect the load 14, the anode of the thyristor 11 and the cathode of the thyristor 12 and the first plate of the second capacitor 8 with the anode of the thyristor 9, the cathode of the thyristor 10 and the first output of the choke 13, the second output of which is connected to the second output terminal for connecting the load 14. Negative source bus 1 is connected to the cathodes of diodes 5 and b, the anodes of which are connected respectively to common points of connection of the second plate of the first capacitor 7 with the cathode of the thyristor 9 v, the anode of the thyristor 10 and the second plate of the second capacitor 8 with the cathode thyristor 11 and the anode of the thyristor 12. The output buses of the control unit 15 are connected to the control transitions of the respective charge and discharge thyristors.

The Converter operates as follows.

When the control unit 15 is turned on, the latter generates control pulses for the thyristors in the following cycle sequence: thyristor 3, thyristor 9, thyristor 12, thyristor 4, thyristor 11, thyristor 10. In the event that different polarity pulses with a given energy enter the load i.e. there is a stable pulsed energy flow

five

0

five

0

five

0

The thyristor control pulses 12 and 10 are not formed and the thyristors are included in the following order: thyristor 3, thyristor 9, thyristor 4, thyristor 11. Consider the operation of the converter in the mode of stabilizing the charging voltage of the capacitors, at which the pulsed power consumption is stabilized. Such stabilization is ensured by the inclusion of thyristors 12 and 10 when the first 7 and second 8 capacitors are discharged respectively. The moment of switching on these thyristors is determined depending on the magnitude of the equivalent active resistance R3 of the dispersion unit, so that the residual voltage Uo on the capacitor connected during the discharge is equal to the specified one. Then, in a steady state e load, the load is dissipated during the half-wave of the output voltage (C) of the voltage, U / U (U iU2o), where C is the capacitance of the capacitors,

The control unit (Fig. 2) in the most general case in de contains a pulse-on generator of charge 3, 4 and bit 9, 11 thyristors, built according to a rigid circuit, a module for dynamic determination of the magnitude

-§- (itf-u (t)) ± 4S (t)

R3 (t) -

/ iS (t) dt tp

where Uc (t) is the discharge voltage of the capacitor 7 or 8;

H (t) is the load current;

L - inductance of droplets 13;

tp is the moment of switching on the thyristor 9 or 11,

the thyristor turn-on pulse shaping module 12 or 10, respectively.

The impulse generator of charge and discharge thyristors includes a generator of 16 pulses (G), the output of which is connected to the input of the shift register (PC) 17 and the first inputs of the block 18 of the four logic elements And, the second inputs of which are connected to the corresponding outputs of the PC 17. Outputs The block 18 is connected to the inputs of the block 19 of the four formers (f) of the turn-on pulses of thyristors 3, 9, 4 and 11, respectively. The dynamic definition module R3 (t) contains two voltage switches 20 and 21 (KN) on the first Uci (t) and second Uc2 (t) capacitors working in antiphase under the control of the output signal of the logic element OR 22. The output of the KH 20 is connected to the input sampling-storage device (VHF) 23, the control input of which is connected to the output of the logic element OR 24. The output of the VHD 23 is connected to the inputs of the multiplication unit 25 (BOOM), which performs the squaring operation. A similar operation is performed by the PCB 26 and 27, the inputs of which are connected respectively to the outputs of the CL 20 and the load current measuring transducer iH (t).

The outputs of all BOOM are connected to the corresponding inputs of the adder (CM) 28, the output of which is connected to the first input of the dividing unit 29 (DB), to the second input of which the output of the BUM 27 integrated by the integrator (INT) 30 arrives. BD 29 RD (t) output signal is fed to the input of the first analog-to-digital converter (ADC) 31, the output of which is connected to the address inputs of the converter 32 codes (PC), the input of the second ADC 33 is connected to the output of KH 21, and the output also to the address inputs of PC 32. The output code of the PC on the first input of a digital device Neither is (CI) 34, to the second input of which the code of the specified residual voltage U0 arrives, and the output of the AC 34 is connected to the input of the waiting one-shot (LAD) 35, the generated impulse of which goes to the first RODS elements 36 and 37, the second inputs of which are connected to the outputs of the elements OR 38 and 22, respectively. The output pulses of the elements 35 and 37 are fed to the inputs of the drivers (F) 39 and 40, respectively, the outputs of which are connected to the control junctions of the thyristors 12 and 10, respectively. The control unit also contains an RS flip-flop (T) 41 which changes its content Standing at time tp with the arrival of a pulse at its S-input from the output of the logic element OR 24. At the same time, the real-life generator 42 (GDV) generates pulses that go to the counter input (MF) 43, the output code of which goes to the address inputs PC.

The delay line 44 (LZ) is intended to set the trigger 41 to the initial state upon completion of the process of discharging the capacitors. The digital converter of the PCs determines the value of the predicted residual voltage on the capacitor connected during the discharge of the capacitor at times tp of the output of the GDV 42 pulses. However, the turn-on pulse of the corresponding thyristor

for connection to the load of this capacitor is formed at the moment of equality of the codes Uonp and Uo. As a result of the discharge cycle, the residual voltage on the connected capacitor is Uo, and the charging voltage of this capacitor is Ui Е + (E-Uo). where E is the voltage of the source, Qo is the Q-factor of the charging circuits, does not change from pulse to pulse with changes in load resistance, thereby stabilizing the pulse energy consumption, thermal conditions and high quality of dispersion. -,

FORUMAWLAH AND ISLANDS

Thyristor DC to pulsed voltage converter for powering process units for dispersing metals, containing a source

constant voltage, to the positive pole of which the first output of the charge choke is connected, to the second output of which the anodes of the first and second charge thyristors, the cathodes of which are connected respectively, are connected to the connection points of the anodes of the first and second discharge thyristors with the first leads, respectively, of the first and the second capacitors, the second terminals of which are connected coherently to the anodes of the first and second diodes, the cathodes of which are connected to the negative pole of the constant voltage source, as well as ASP projectile loader throttle, output terminals for connecting

loads and a control unit whose output buses are connected to control transitions of the corresponding thyristor, characterized in that, with a wide extension of the output voltage control range and n, increasing the stability of the pulse energy consumption, the third and fourth discharge torsmors are connected in opposite directions -in parallel to

the first and second discharge thyristors, the anodes of which are connected, respectively, to the first output pin and the first pin of the discharge droplet, and the cathodes to the second pin, respectively, of the second and

the first capacitor, while the second output of the discharge throttle is connected to the second output terminal, and the control transitions of the inserted thyristors are connected to the corresponding additional output buses of the control unit.

To thyristor 3 To thyristor 9 To thyristor C

To thyristor 11

To thyristor P To thyristor 10

Shaa.2

Claims (1)

Claim A thyristor DC-to-pulse converter for supplying metal dispersion technological plants, containing a constant voltage source, to the positive pole of which is connected the first output of the charging inductor, to the second output of which are connected the anodes of the first and second charging thyristors, the cathodes of which are connected respectively to the connection points of the anodes of the first and the second discharge thyristors with the first conclusions, respectively, of the first and second capacitors, the second conclusions of which are connected respectively, to the anodes of the first and second diodes, the cathodes of which are connected to the negative pole of the DC voltage source, as well as a discharge choke, output terminals for connecting the load and a control unit, the output buses of which are connected to the control transitions of the corresponding thyristors, characterized in that, in order to expanding the range of regulation of the output voltage and increasing the stability of pulsed power consumption, additionally introduced the third and fourth discharge thyristors connected finite-parallel, respectively, to the first and second discharge thyristors, the anodes of which are connected, respectively, to the first output terminal and the first terminal of the discharge choke, and the cathodes are connected to the second terminals of the second and first capacitors, respectively, while the second terminal of the discharge choke is connected to the second output output, and the control transitions of the introduced thyristors are connected to the corresponding additionally entered output buses of the control unit. To thyristor 10 .... ........ ”G f To thyristor 3 To thyristor 9 To thyristor Oh To thyristor 11 Um Wonp _Mr. J 36 y "·· 1 and ·. Ί39 - 35 37 W To thyristor 12