SU534836A1

SU534836A1 - Thyristor control device

Info

Publication number: SU534836A1
Application number: SU2073019A
Authority: SU
Inventors: Геннадий Викторович Могилевский; Виктор Иванович Гребенник; Сергей Владимирович Дикань; Василий Васильевич Колосов
Original assignee: Предприятие П/Я А-7147
Priority date: 1974-11-04
Filing date: 1974-11-04
Publication date: 1976-11-05

Description

1one

Изобретение относитс к области зпектротехники , в частности к устройствам управлени тиристорами, предназначенным дл использовани в бесконтактном аппаратостроении .The invention relates to the field of optical engineering, in particular to thyristor control devices intended for use in non-contact engineering.

Известно устройство управлени тиристорами , используемое в силовой бесконтактной аппаратуре, содержащее генератор импульсов выход которого через импульснь1й трансформатор подключен ко входу тиристора ( I). A thyristor control device used in power contactless equipment is known, which contains a pulse generator whose output is connected via a pulse transformer to the input of the thyristor (I).

Однако в таких устройствах на тиристор подаютс сигналы управлени в течение вс$го времени существовани тока через тиристор .However, in such devices, control signals are supplied to the thyristor during the entire time that the current through the thyristor exists.

Устройство дл управлени двум управл емыми вентил ми предназначено дл управлени двум попеременно открываемыми вентил ми. Это устройство содержит узел формировани управл ющего напр жени , вы.ход которого соединен со входом генератора импульсов, выход которого через импульсный трансформатор подключен к управ ютдим электродам управл емых вентилей(11A device for controlling two controllable gates is intended for controlling two alternately opened gates. This device contains a control voltage generating unit, the output of which is connected to the input of the pulse generator, the output of which through a pulse transformer is connected to control electrodes of controlled gates (11

Недостатком этого устройства вл етс то, что управл ющие импульсы на тиристор The disadvantage of this device is that the thyristor control pulses

подаютс в течение всего времени существовани тока через тиристор и, следовательно , при угле фазового регулировани , равног О , в течение полупериода колебани напр жени сети.served during the entire time of the existence of the current through the thyristor and, therefore, at a phase control angle equal to 0, during the half-period of the mains voltage.

Наиболее известно устройство дл управлени тиристорами, которое содержит трансформатор тока, вторична обмотка которого через выпр митель подключена ко входу реле уровн , с выхода последнего сигнал через схему И, на второй вход которой подаетс сигнал с генератора импульсов, поступает на усилитель-формирователь управл ющих сигналов (in). Устройство обеспечивает формирование сигнала управлени в течение времени, когда ток силовой цепи меныще тока удержани тиристоров.The most well-known device for controlling thyristors, which contains a current transformer, the secondary winding of which is connected via a rectifier to the input of a level relay, the output of the latter through an AND circuit, to the second input of which a signal from the pulse generator is fed to the control signal shaper (in). The device provides the formation of a control signal during the time when the main circuit current is less than the thyristor holding current.

Claims

The disadvantage of this device is the low reliability of operation at low currents (up to 10 A) due to the relatively large angular divergence between the primary and secondary current of the current transformer, as a result of which the control signal can be removed at a current circuit current less than the thyristor holding current. The chain of the invention is to improve the reliability of the device, in order to eliminate the low error and reduce power yjirjaBneHiiH at low currents of the power circuit. This goal is achieved by the fact that the proposed device containing a transformer, the secondary winding of which is connected via a rectifier to the input of the level relay, the output of the last-through circuit And, the second input of which is connected to the output of the pulse generator 5 it is equipped with a current zero sensor and OR and NOT circuits, and the zero current output of the iod-keys sensor to the circuit input, the output of which is not connected to the circuit input I / H via cxeiviy. FIG. 1 is a block diagram of a thyristor control device; Fig 2 - temporary diagrams of his work. The control unit contains the current transformer 1, current 2, switch 3, level switch 1 .. 4, pulse generator 5, cxejv.n / OR 6, the circuit NOT, AND; -, siaCa / b-formheErBatel 9 Fig. 2 shows the time dia: the time of operation of the thyristor control device at current si: 7th tsegl: less green; h; 11b an VA / TH where: 1 torus; the safety factor, which depends on the angular norpeiunity of the current transformer and was chosen so that, with a maximum angular error ci.is.me, the control signal does not occur before the current in the power network reaches 1 unit. In FIG. 2, the potential potential of managing the functional units is given, while the CA1Gnalu logical corresponds to a high potential; and the logical O signal is a low (zero) potential; the thyristor control device works as soon as possible; A rectangular trigger pulse of negative polarity with a duration (Te is the repetition period of the mains voltage) cut circuit OR 6, is fed to the input of the NOT 7. circuit. from the output of the level 4 relay, if the current in the power circuit is less than the fi value. The third input of the AND circuit is supplied with impulses from the pulse generator 5. From the output of the AND 8 circuit, a rectangular pulse of duration T. It is not the Nyu Zmoul band of the high frequency that is supplied to the input of the amplifier of the imager 9, which forms a powerful thyristor control signal. When power lazy current passes through a zero value, the current sensor O generates a square kmnus of negative polarity (logical O) with a duration of -v (as shown in Fig. 2), which through the OR and KE circuits enters the first input of the AND circuit, ensuring the formation control signal at the time of zero value of the current of the power circuit and with a value equal to when the current of the power circuit is less than the value of dp. When the current of the power circuit exceeds the value, the duration of the control signal decreases under the influence of the feedback current through ranformator 1, rectifier 2, level switch 4. Level 4 relay output generates a logic O signal at a power circuit current exceeding the value of n ,, - uur. Thus, the proposed device for controlling thyristors provides high reliability of thyristor-iro device operation in a wide range operating currents, while the thyristor control power je exceeds the allowable voltage. Claims An apparatus for controlling thyristors containing a current transformer, the secondary winding of which is connected via a rectifier to the input of a level turnip l and h and y u e e tem; that, in order to increase the hope of operation, it is equipped with a current zero sensor and cholesterol: OR or NOT and the current zero output sensor is connected to the input of the OR circuit, the output of which is NOT connected to the third input of the I circuit through the circuit. attention in the examination: 1. Thyristors. Technical reference book ed. Labunceva V. A. and others. Energie. 1971, p. 179.

2. The patent of Germany No. 1563311, cl. 2.1 from 12/04, 1972

3. USSR Author's Certificate No. 2971О7, И О2 Р 13/16, 1969