CS245981B1 - Connection of thyristor switching pulse generator - Google Patents

Abstract

The purpose of the solution is to simplify the connection, reduce the size and reduce the power consumption of the switching pulse generator of thyristors in cases where the phase control range of the input pulses 120 0 el. This purpose is achieved by engaging a thyristor tension pulse generator comprising filtering and shaping circuits, a synchronization logic circuit, a saw signal generator, a comparing pulse generating circuit. Three synchronization voltages and a 360 ° el. and the relative displacement of 120 ° el. a pulse synchronization signal with a period of 120 ° el. which then synchronizes a single saw signal circuit. Said saw signal is then compared with the control signal level in a single comparator circuit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention

The previously used thyristor starting pulse generators for three-phase three-phase inverters are always arranged to cover the phase control range of the starting pulse required for general load control, ie 180 ° el. To do this, they use three circuits generating a periodic saw signal with 180 ° el.

These signals are individually synchronized according to the respective phases. the mains supplying the inverter have a mutual offset of 120 ° el. By comparing the level of the control signal and the mentioned saw signals in three comparison circuits, the respective moment of generating the trigger pulse is determined for each inverter thyristors ·

In some cases, for example, battery chargers working with a counter voltage, a phase control range of 120 ° el. Pulse is sufficient to control the inverter at a given load. Then the length of the saw signal of the above-mentioned thyristor starting pulse generator is redundant and its concept is unnecessarily complex. The actual thyristor starting pulse generator is also larger and consumes more electricity.

These disadvantages are eliminated by the connection of the thyristor starting pulse generator according to the invention, consisting of filtering and shaping circuits, a synchronization logic circuit, a saw generator

245,981 of the signal, the comparator circuit, and the trigger pulse generation circuit. The first input terminal of the thyristor pulse generator is coupled to the input of the first filtering and shaping circuit. His high-

second circuit filtration and shaping. Its output is connected to the second input of the synchronization logic circuit. The third input terminal of the thyristor pulse generator is connected to the input of the third filtering and shaping circuit. Its output is connected to the third input of the synchronization logic circuit. The first output of the synchronization logic circuit is coupled to the first input of the make-up pulse circuit. Its first output is connected by the first output terminal of the thyristor pulse generator. The second output of the synchronization logic circuit is coupled to the second input of the make-up pulse circuit. Its second output is connected to the second output terminal of the thyristor pulse generator. The third output of the synchronization logic circuit is coupled to the third input of the make-up pulse circuit. Its third output is connected to the third output terminal of the thyristor pulse generator. the fourth output of the synchronization logic circuit is coupled to the input of the saw signal generator. Its output is connected to the first input of the comparator circuit, the second input of which is connected, to the fourth output terminal of the thyristor pulse generator. The output of the comparator circuit is coupled to the fourth input of the make-up pulse circuit.

The wiring of the thyristor trigger pulse generator according to the invention is 120 ° el for the range of phase control of the trigger pulse. easier. The dimensions of the inverter's own pulse generator are smaller and its power consumption is lower.

The attached drawing shows the connection of the thyristor starting pulse generator in a block diagram.

Specific embodiments

The circuitry of the thyristor ON pulse generator 1 is comprised of three filtering and shaping circuits 2, 5, a synchronization logic circuit 6, a saw signal generator 2, a comparator circuit 8 and a start pulse generating circuit.

The first input terminal 11 of the thyristor pulse generator 1 is connected to the input 31 of the first filtering and shaping circuit 2,

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Its output 32 is connected β by the first input 61 of the synchronization logic circuit 6. The second input terminal 12 of the thyristor pulse generator 6. its output 62 is connected to the second input 62 of the synchronization logic circuit 6. The third input terminal 13 of the thyristor pulse generator 6 is connected to the input 51 of the third filtering and shaping circuit 5. output 52 is coupled to the third input 63 of the sync logic circuit 6. The first output 64 of the sync logic circuit 6 is coupled to the first input 91 of the start pulse generation circuit 91. Its first output 94 is connected to the first output terminal 101 of the thyristor start pulse generator. * The second output 65 of the synchronization logic circuit 6 is coupled to the second input 92 of the pulse generating circuit 6. Its second output 95 is coupled to the second output terminal 102 of the thyristor pulse generator 1. 93 of the triggering circuit *, its third output 96 is connected to the third output terminal 103 of the thyristor pulse generator 1; the fourth output 81 of the synchronization logic circuit 6 is connected to the input 81 of the saw signal generator. Its output 72 is connected to the first input 81 of the comparator 8; connected to the fourth input terminal 2 of the thyristor pulse generator 1 * The output 83 of the comparator circuit 8 is coupled to the fourth input 97 of the pulse formation circuit 97. The individual voltages of the AC three-phase synchronization signal system are applied to inputs 31. 41. , 2 filtering and shaping * On their outputs 32. 42. 52 are pulse logic signals with a period of 360 ° el. and an active level length of 180 ° el *, whose mutual displacement is 120 ° el. These signals are individually applied to first input 61, second input 62, and third input 63 of circuit & sync logic * Pulse logic signals with period length and offset relative to the respective input inputs are generated at its first output 64, second output 65 and third output 66. signals and active level length 120 ° el. A pulse logic signal with a 120 ° el period is taken from the fourth output 67 of the synchronization logic circuit 6. for starting the χ saw signal generator, generating a saw signal with a period of 120 ° el as well * This signal is applied via the first input 81 to the comparator circuit 8 * Its second input 82 receives the control signal from the fourth input 2 of the thyristor pulse generator 1 * When value decreases

- 4 245 981 saw signal below the control signal, the logic signal at output 83 of the comparator circuit 8 goes to the active level * This at the fourth input 97 of the voltage pulse generation circuit for command 2 generates the pulse generation command its first output 94 · second output 95 and third output 96 ·

Depending on which of the inputs, whether the active level signal is at the first input 91, the second input 92 or the third input 93 of the pulse generating circuit 8, the corresponding first output 94 or the second output 95 is selected for the pulse generating. third output 96 of the pulse generating circuit 2;

Claims (1)

Connection of thyristor starting pulse generator, consisting of filtering and shaping circuits, synchronization logic circuit, saw signal generator, comparator circuit and starting pulse generating circuit, characterized in that the first input terminal (11) of the thyristor starting pulse generator (11) is connected by ee input (31) of the first filtering and shaping circuit whose output (32) is connected to the first input (61) of the synchronization logic circuit (6), the second input terminal (12) of the thyristor starting pulse generator (1) is connected to the filtering and shaping input (41) of the second circuit (4), the output of which (42) is connected to the second input (62) of the synchronization logic circuit (6) and the third input terminal (13) of the thyristor pulse generator (51) of a third filtering and shaping circuit whose output (52) is connected to a third input (63) of the synchronization logic circuit (6), wherein the first output (64) of the The first output (94) is connected to the first output terminal (101) of the thyristor start pulses (101), the second output (65) of the synchronization logic. the circuit (6) of the synchronization logic is connected to a second input (92) of the circuit for generating an on / off pulse whose second output (95) is connected to a second output terminal (102) of the thyristor on / off generator the circuitry (6) of the synchronization logic is connected to a third input (93) of the circuitry 9, the third output (96) of which is connected by the third output terminal (103) of the thyristor starter generator (1), the fourth output (67) the circuit (6) of the synchronization logic is connected to the input (71) of the saw signal generator (7) whose output (72) is connected to the first input (81) of the comparator (8), the second input (82) of which is connected. the fourth vatupoia of st The thyristor switching pulse generator (2) and the output (83) of the comparator circuit (8) are coupled to the fourth input (97) of the circuit (9) to form a trigger pulse.