SU811485A1 - Multichannel device for control of power-diode converter - Google Patents

Description

one

The invention relates to a converter technique and can be used to control stand-alone voltage inverters.

A multichannel device for controlling valve converters is known, consisting of identical channels, each of which contains a synchronizing pulse shaper, a sweep voltage shaper, which has a sinusoidal, sawtooth or triangular shape, and a comparator, where the control voltage is compared with the sweep and control pulse is generated 1.

This device has a significant drawback, namely, the asymmetry of the steering angle, which is 3-6 el. hail, and due to technological variation of control channels.

The closest to the invention is a device that consists of identical channels, each of which contains a clock generator, a pulse counter, a coincidence unit, the inputs of which are connected to the discharge bits of the counter, and common to all channels of the adjustable oscillator 2.

However, this device has several disadvantages. First, the adjustment angle may exceed 180 PLN. hail, which is equivalent to the transmission of a control pulse and leads to a converter failure.

Secondly, the device is not applicable to transistor converters that require wide control pulses, the duration of which is equal to the duration of the conducting state of the transistors, while narrow pulses are formed at the output of the specified device.

The aim of the invention is to increase the reliability and enhance the functionality of the device. The goal is achieved by the fact that

A multichannel device for controlling a valve converter is provided with a 2-2I-2ILR1 element and a universal / - / (- trigger, the forward and inverse outputs of the clock generator and the universal / - C-trigger being connected to the first and second inputs of the 2-2I element -2ILI, respectively, the direct and inverse outputs of the synchronization pulse generator are connected respectively to the inputs I K of the universal / - / (- trigger, the output of the element 2-2 and 2, OR connected to the installation input of the pulse counter, the counting input which is connected to the output of the adjustable oscillator, and the clock input of the universal / -X-flip-flop is connected to the output of the coincidence unit.

FIG. 1 shows a diagram of a multichannel device; in fig. 2 - diagrams explaining his work; in fig. 3 - the logic circuit of the universal / -Crigger, which can work both in synchronous and asynchronous mode; in fig. 4 - timing charts of the trigger.

The multichannel device consists of identical channels, each of which contains a shaper of 1 clock pulses, 2-2I-2ILI 2 elements, a 3-pulse counter, a 4-match block, a universal / -K-flip-flop 5, and a common variable for all channels of the adjustable oscillator 6 . The signals on the direct and inverse outputs of the elements are denoted by or without the element number of the inversion sign, respectively.

The asynchronous mode of the unersical / - / (- trigger is observed if the "1" signal is constantly applied to the clock input C of the trigger, and the signals at the inputs / and K. are out of phase and change. The signal at the output Q of the trigger is repeat. The signal "K, and the output signal Q repeats the signal" / (times to - i). In synchronous (times i = 2), the trigger switches when the signal at the clock input changes from "1 to" O, thus that the signal at the output of the Q flip-flop becomes the same as at the input /, and at the output Q - the same as at the input works as follows: Let the signal at the forward output of driver 1 is equal to “1, and the signal at the direct output of trigger 5 is equal to“ O. Then the signal at the output of element 2-2И-2ИЛИ 2, functioning in accordance with the equation

 + Qi-Qs

will be equal to "O", and counter 3 performs counting of pulses from generator 6. When the counter is filled, the signal at the output of the matching block becomes equal to "O and the trigger" 5 goes to state "1. At the same time, at the output of element 2-2I-2ILI, a signal is formed corresponding to the logic level "1, and the counter is reset, the signal" 1 is set at the output of the matching block, and the channel is ready to receive the next clock pulse. At the same time, the / - / C-trigger though goes into asynchronous mode, but will not return to its original state when the signals at the inputs I and K, coming from the outputs of the clock generator, change, because these signals affect the trigger, to set him in the state that he has already received under the effect of a clock signal.

If, over the half-period of the synchronizing voltage, the meter did not have time to fill,

then at the output of the match block, the signal is constantly equal to "1, and the universal / - / (trigger 5 will switch in antiphase with the synchronizing voltage (asynchronous mode). Thus, the angle

control is automatically limited to 180 el. hail.

If the device is intended to be controlled by an inverter, then as clock drivers

Triggers or magneto-transistor multivibrators of a ring scale can be used. If the device is intended to control the rectifier, then as a driver

synchronizing pulses, zero-organs can be used, made, for example, on operational amplifiers and connected to a mains voltage. In any case, the output of the formers

receive direct and inverse signals with a duty cycle of 2.

This multichannel device as compared with the known ones is more reliable due to the exclusion of emergency modes, so

as the angle of adjustment at any values of the frequency of the generator can not exceed 180 e. hail. In addition, it is simpler and has advanced functionality, since it is applicable to

generating antiphase control pulses suitable for controlling both thyristor and transistor converters.

Claims (2)

1. USSR author's certificate number 559353, cl. H 02 P 13/16, 1976. 2. USSR author's certificate number 550755, cl. H 02 P 13/16, 1976. uz.i