SU1115199A1 - Control device for thyristor static converter - Google Patents

Abstract

DEVICE .For control of a thyristor static inverter with a stepped output voltage, including a high-frequency inverter with a matching transformer and a demodulator containing a current sensor, a ring scaling circuit connected by the main conjuncer, the serial generator connected to the trigger and triggered tamper circuitry, triggered pattern templates, triggered voltages to the control circuits of the high-frequency inverter, main conjunctors, and through a frequency divider with a ring scaling circuit, .ignificant conjunctors connected to the first output of the current sensor, main conjunctors, the master oscillator and the corresponding. cells of the ring scaling circuit, and auxiliary conjunctors, connected to the outputs of the main conjunctors, characterized in that, in order to increase efficiency and reliability, it is equipped with a pulse counter, an inverter, two four-input and four three-input. conjunctors, with the outputs of the pulse counter connected to the master oscillator and frequency divider, and the output with the inverter and four three-input conjunctors, the inputs of the four-input conjunctors with the master oscillator, 9 inverter H with the corresponding main conjunctors and cells of the ring scaling circuit, the outputs are combined with the outputs conjunctors, free three-input inputs from input conjunctors are connected to the first current sensor output and ring scaling circuit, the outputs are combined with the corresponding w cl conductive vyxoda additional conjunctors, moreover, the inverter output is connected to the inputs of additional conjunctors, IcO current sensor and the second output - with. auxiliary conjunctors.

Description

The invention relates to a converter technique, in the private network. to static, DC / DC converters with AC-. Intermediate link of the increased frequency. A device is known; a control for a static converter comprising a master oscillator and a trigger, a frequency divider and a ring scaling circuit, main, additional and auxiliary conjunctors and a current sensor. The control device provides a static converter for load with any power factor 13. However, this device has low efficiency and reliability of the converter when operating on a load with a low power factor. This is due to the fact that when the inverter operates in the inverter mode (when the polarities of the current and voltage do not coincide), the main control pulses arrive at the thyristor control circuits, and this leads to short-circuiting of the secondary windings of the transformer for the duration of additional control pulses. The closest in technical essence to the invention is a device for controlling a statically converter, comprising a current sensor, interconnected ring scaling circuit and main conjunctors, connected in series by an oscillator and a trigger, the outputs of which are connected by terminals for connection to control circuits. high-frequency inverter, main conjunctors and through a divider. frequencies with ring scaling circuit, additional conjunctors connected to the first output by the current sensor, the main drivers, the master oscillator and the corresponding cells of the ring scaling circuit

and auxiliary conjunctors associated with principal conjunctors. The control unit provides a static converter for any C 2 load.

However, the known device has low efficiency and reliability of the converter when operating on a load with a low power factor. This is explained by the fact that when the converter operates in the inverter mode after the additional control pulses are supplied, necessary to ensure

individual circuit elements.

The control unit contains a high-frequency (power) inverter 1, a matching transformer 2. with secondary windings 3 and 4 and a demodulator on thyristors 5-16, a current sensor 17 connected to each other by an annular counting circuit on cells 18-29 and the main components 30-41, a serially connected master oscillator 42 and a trigger 43, the outputs of which are connected to the terminals for connecting to the control circuits of the high-frequency 9 or energy exchange between the load and the primary power source, the secondary windings of the matching trap close asformator through demodulator thyristors. The duration of the closing of the secondary windings is determined by the duration of the additional control pulses, i.e. necessary time to restore the demodulator thyristors. The purpose of the invention is to increase efficiency and reliability by eliminating the possibility of shorting the secondary windings of the matching inverter transformer through the demodulator thyristors. To achieve the objective device is provided with a counter pulse inverter, two chetyrehvhodOvymi and four trehvhodovymi conjunctors, wherein the pulse counter inputs are connected to the master oscillator and frequency divider, and an output - to the inverter and four trehvhodovymi conjunctors inputs chetyrehvhodovyh conjunctors - a master oscillator, an inverter, and corresponding main conjunctors and cells of the ring scaling circuit, the outputs are combined with the outputs of additional conjunctors, the free inputs of three voltages running conjunctors are connected to the first current sensor input and ring scaling circuit, the outputs are combined with the corresponding outputs of additional conjunctors, in addition, the inverter output is connected to the inputs of additional conjunctors, and the second current sensor output is connected to auxiliary conjunctors. FIG. 1 shows a device for controlling a thyristor static converter (together with a power inverter, a matching transformer and a demodulator); in fig. 2 shows voltage diagrams on an inverter, main conjuncturers through a frequency divider 44 with a ring scaling circuit, additional conjunctors 45-56, connected to the first current sensor output 57, the main conjunctors of the master oscillator and the corresponding cells of the ring scaling circuit, and auxiliary conjunctors 58- 69, associated with the main conjunctors, the pulse counter 70, the inverter (element NO) 71, the four-input 72 and 73 and the three-input 74-77 conjunct, the current sensor has a second output 78. In FIG. 1, reference points 79-90 are marked, from where signals are sent to additional and four-quota conjunctions. A load 91 is turned on at the output of the demodulator. In FIG. 2 shows the voltage 92 of the high-frequency inverter, control pulses 93-104, respectively, arriving at the thyristors to the demodulator, and the idealized voltage 105 at the output of the demodulator. The inputs of pulse counter 70 are connected to a master oscillator 42 and a frequency divider 44, and the output is connected to an inverter 71 and three-input conjunctors 74-77, the inputs to four-input conjunctors 72 and 73 with a master oscillator 42, inverter 71 and the corresponding main conjunctors 30-41 and cells 18 -29 ring scaling circuit 1, and the output combined with the outputs of additional conjunctors 45-56, the free inputs of three-input conjunctors 74-77 are additionally connected to the first output 57 of the current sensor 17 and the rings of the scaling circuit, and the outputs are combined with additional outputs 45-56, in addition, the output of the inverter 78 is connected to certain inputs of additional conjunctors 45, 46, 52 ii, 53, and the second output 78 of the sensor; 17 current - with. adjunctive conjunctors 58-69 The device works in the following way. . The master oscillator 42 generates unipolar pulses with a duration of additional control pulses (the required recovery time of the demodulator thyristors) with a frequency of 2 ikfeirtii. The cutoff pulse of the master oscillator is synchronized with a trigger 43, which forms a rectangular voltage with frequency ikfjqy, which is applied to control the key elements of the inverter 1, the main conjunctors 3U-41 and the frequency divider 44. The output of the frequency divider 44 is generally formed by a rectangular voltage, frequency i fgy, supplied to an annular counting circuit, the output of which generally produces square signals of duration to-C (at the output of cell 18), (Ha output of cell 19 ), (at the output of cell 20), t;, 2 (at the output of cell 21), etc. At the outputs of the main conjunctors 30-41, to the inputs of which the output signals of the cells 18-29 of the ring scaling circuit are received, a series of basic pulses for controlling the voltage of the high-frequency inverter is formed. So, the first input of the conjunctor 18 is received 1 in the time intervals to-t, and so on (with a positive voltage value 92) from the trigger 43, and to the second input - from the combined outputs of the cells 19 and 22. The main control pulses at the output of the circuits 30 (for thyristor 11) appears in the intervals of time, tg-t, t -t, tjig (for the period of the output voltage 105). In addition, it is required to obtain the main thyristor control pulses 11 in the intervals, tj-t / ,, t -tz2. and t23-t24, for which one input of conjunctor 32 enters Q flip-flop 43 .1 at intervals of negative voltage value 92, and at the second input comes from the combined outputs of cells 18 and 23 (at intervals of tg-t and t-tji) Similarly, the main control pulses are generated at the outputs of the remaining conjunctors (31-41) (so far without considering the converter operation mode), i.e. the main control pulses 93-104 are formed at the outputs 87, 81, 82, 89, 86, 79, 80 , 85, 88, 84, 83 and 90. Next, the received signals go to auxiliary conjunctors 58-69, to which additionally, the signal from the second output of the current sensor 17 is set. At the second output of current sensor 1, it is formed in the time intervals when the converter is operating in the rectifying mode at the time intervals, (T) t, o. Thus it is provided. supply to the demodulator valves of the main pulse-control only when the converter is operating in the inverter mode (blackened in Fig. 2). For the formation of additional control pulses, additional conjunctors 45-56 and conjunctors 72-77 are used. Thus, to obtain, for example, an additional series of pulses 96 at the output of conjunctor A, it is necessary to send a signal from its master oscillator 42- to its input, from the combined outputs of cells 18 and 20 of the ring scaling circuit and from the combined outputs of the main conjunctors, 31, 33 and 34. For receiving additional control pulses only when the converter is operating in the inverter mode, the input signal from the first output of the sensor 17, the output of which 1 exists only in the to-fi, /, T / 2- (T / 2 + +% /) time intervals formed, for example, to additional control pulses 101 at the output of conjunctor 48. Additional pulses 104 (for thyristor 5) are formed by two conjunctors 49 and 75. Conjunctor 49 provides additional control signals in the time interval tn-t / d at negative values of voltage 92 and additional a control pulse at the end of the first clock interval (before the time point z) is generated by the conjunctor 75. At its input, signals from the first output of the current sensor 17, the first cell 18 of the ring scaler and from the output of the counter 70 imp pulses, which generates pulses similar to the master oscillator 42, but c is ato K times lower, i.e. at the end of each clock voltage interval 105. Pulse counter 70 operates in the frequency divider mode, and in order for the pulses at its output to fall at the end of each clock interval, the counter drop circuits are connected to the output of frequency divider 44. Extra pulses 93, for thyristor 16, are carried out by 96 three conjunctors 50., 74 and 72. Conjunctor 50 provides additional impulses of control in the time interval and with negative values of voltage 92, the conjunctor of the additional impulse at the end of the second clock interval (before time tg), and CONNECTOR 72 - pulse in the middle of the first clock interval. To obtain the last pulse, the inputs of the conjunctor 72 receive pulses from the master oscillator 42, from the combined outputs of the main conjunctors 31 and 33, the cells 18 of the ring scaler and the inverter 71, the output of which always has 1 except for the ends of the clock intervals when the pulse appears at the output of the counter 70 pulses. Additional control pulses 97 at the output of conjunctor 46 are obtained by applying signals from the generator 42, integrated cells 18 and 19, a ring scaling circuit, the first output of the current sensor 17 and inverter 71 to it. The signal from the inverter 71 is introduced. instant tg. Similarly, additional pulses 100 are received at the output of conjunctor 47 fed to the thyristor 9 and additional control pulses generated and fed to the demodulator thyristors in the second half-period of voltage 105. Thus, the device for controlling the thyristor static converter ensures the normal operation of the power section to the load with any power factor, it allows to get voltage at the output, whose form does not depend on the load parameters, provides higher K D converter and reliability as a whole by eliminating the possibility of short .zamykani secondary windings of the matching transformer via the thyristors demodulator when operating the converter in the inverter mode.

, ryiv, r. .

rrrv

JT fWJIW

I-1-1 i. i,.

re

n n p

  i (yp

P

"

N nf

t6

/ f / j

UL

Jul

/ tf tl9

I I n / r

nmn (i i - n n y .- i n; y tifs

 Ji7 n m f

. ./j laiLJLMJLJL.

I..JLJLJJL

. .. "..

«« JJIJL

J "-. n:

n P

tJ9

i i n

# "/

/ J /

cm

J

jt

t

t

eleven /"

f "5

“R

jpOjxixP--

Claims (1)

DEVICE FOR CONTROL OF A THYRISTOR STATIC CONVERTER with a step-like form of output voltage, including a high-frequency inverter with a matching transformer and a demodulator, containing a current sensor, a ring conversion circuit connected to the main conjunctor, serially connected to the master oscillator and triggers connected to the terminals to the outputs of which control of the high-frequency inverter, the main conjunctors and through the frequency divider with a ring recalculation circuit, additional conjunctors connected to the first output of the current sensor, the main conjunctors, the master oscillator and the corresponding cells of the ring recalculation circuit, and auxiliary conjunctors connected to the outputs of the main conjunctors, characterized in that, in order to increase efficiency and reliability, it is equipped with a pulse counter, an inverter, two four-input and four three-input, conjunctors, and the outputs of the pulse counter are connected to a master oscillator and a frequency divider, and the output to an inverter and four three-inputs inputs, inputs of the four-input connectors - with a master oscillator, an inverter and the corresponding main conjunctors and cells of the ring conversion circuit, the outputs are combined with the outputs of the additional connectors, the free inputs of the three-input connectors are connected to the first output of the current sensor and the ring conversion circuit, the outputs are combined with the outputs of the combined conversion circuit, the outputs are combined conjunctors, in addition, the inverter output is connected to the inputs of additional conjunctors, and the second output of the current sensor is connected to auxiliary efficient conjunctors. SU ... 1115199 I 1 1115199 2