SU767910A1

SU767910A1 - Device for phase control of thyristors

Info

Publication number: SU767910A1
Application number: SU752305027A
Authority: SU
Inventors: Владимир Алексеевич Минченко; Владимир Семенович Заика
Original assignee: Предприятие П/Я Р-6495
Priority date: 1975-12-25
Filing date: 1975-12-25
Publication date: 1980-09-30

Description

54) УСТРОЙСТВО ДЛЯ ФАЗОВОГО УПРАВЛЕНИЯ ТИРИСТОРАМИ54) DEVICE FOR PHASE THIRISTOR MANAGEMENT

1one

Изобретение относитс к электро- технике и может быть использовано в системах автоматического управлени , контрол и регулировани металлорежущих станков.5The invention relates to electrical engineering and can be used in the systems of automatic control, monitoring and regulation of metal-cutting machines.5

Известно устройство фазового управлени тиристорами, содержащее выпр митель , схему ограничени , генератор пилообразного напр жени , выполненный в виде транзисторного ключаtО с последовательно включенным с ним зар д ым резистором и параллельно включенным ему хронирующим конденсатором , выходной формирователь управ-л ющих импульсов, вход которого сое- 15 динен с выходом генератора пилообразного напр жгени / и источник смещени , подключенный к формирователю и генератору пилообразного напр жени Щ.A thyristor phase control device containing a rectifier, a limiting circuit, a sawtooth generator, made in the form of a transistor switch with a series-connected charging resistor and parallel to the timing capacitor connected to it, the output driver of control pulses, whose input is connected, is known. - 15 dinene with the output of the sawtooth generator / and the bias source connected to the former and the sawtooth generator

К недостаткам таких устройств от- 20 нос тс нелинейность фазовой характеристики , недостаточна помехоустойчивость и низка надежность включени тиристоров. .. The disadvantages of such devices include the non-linearity of the phase response, the lack of interference immunity and the low reliability of switching on the thyristors. ..

. Наиболее близким к изобретению 25 вл етс устройство дл фазового управлени тиристорами, содержащее ис .точник синхронизирующего напр жени к выходу которого подключен генератор пилообразного напр жени , св - 30. The closest to the invention 25 is a device for phase control of thyristors, containing a source of synchronization voltage to the output of which a sawtooth voltage generator is connected, St.

занный через компаратор с выходным формирователем, и источник опорного напр жени 23В этом устройстве длительность управл ющих импульсов может мен тьс в зависимости от величины фазового сдвига, что снижает надежность устройства , и кроме того оно имеет низкую помехоустойчивость.This device is controlled by the comparator with the output driver, and the source of the reference voltage. In this device, the duration of the control pulses may vary depending on the magnitude of the phase shift, which reduces the reliability of the device, and in addition it has low noise immunity.

Цель изобретени - повышение надежности . . ,The purpose of the invention is to increase reliability. . ,

Поставленна цель достигаетс тем/ что устройство снабжено ключом синхронизации, а компаратор выполнен в виде дифференциального усилител на двух транзисторах с, генератором тока в цепи эмиттеров, причем один из входов компа)атора подключен к генератору пилообразного напр жени ,второй - к источнику управл ющего напр жени , а третий через ключ синхроризации соединен с источником синфОнизйрующего напр жени .The goal is achieved by the fact that the device is equipped with a synchronization key, and the comparator is made in the form of a differential amplifier with two transistors with a current generator in the emitter circuit, one of the computer inputs connected to the sawtooth generator, the second to the control source the third, through the sync key, is connected to the source of the syncing voltage.

На фиг. i представлена принципиальна электрическа схема устройства дл управлени тиристорами; на фиг.2временные диаграммы, по сн ющие работу устройства.FIG. i is a circuit diagram of a device for controlling thyristors; Fig. 2 are time diagrams for the operation of the device.

Claims

The device contains a synchronizing voltage source 1, made in the form of a rectifier, a sawtooth voltage generator 2, which includes a current source 3, a discharge switch 4, a timing capacitor 5, a synchronization key b, a comparator 7 made in the form of a differential amplifier 8 s controlled by the Current Generator 9, the reference source 10 resistive. splitter 11, Shmi trigger 12, output driver 13, switch-on time, time master driver 14, and blocking generator 15. The device operates as follows. When a voltage source C rectifier 1 is applied to the input (Fig. 2), negative half-waves and a rectified sinusoidal 17 O voltage appear at the input of the discharge key 4 and the synchronization key 6. This leads to the formation of a linear sawtooth voltage at the output of the key 4, and the same frequency and synchronization pulses at the output of the synchronization key 6. , Voltage and is supplied to one of the inputs of comLarator 7, to another of its inputs a reference voltage is applied and through a resistive divider 11 from the source 10 of the reference voltage. Simultaneously to the third input of the comparator 7, a pulse U4 is supplied from the synchronization key 6, which opens the comparator 7 when forming the forward stroke of the saw voltage and locks it during the formation of the reverse stroke (discharge of the capacitor 5) of the saw voltage. When comparing the sawtooth voltage Oj, with a reference voltage, negative impulses u5, swelling, and a Schmitt trigger are generated at the output of comparator 7. With the release of the Schmitt treigge impulse UQ. input time is set to the driver 14, from the output of which the pulse Uy of the required duration is fed to the input of the waiting blocking generator 15, the output of which generates control pulses Ug of duration t of the series. the phase shift of the series of control pulses relative to the mains voltage is controlled by a potentiometer of the resistive divider 11, and the number of control pulses with frequency f 4 in the series is determined by the parameters of the standby blocking oscillator 15 and the driver time of the driver 14. Formula of the invention containing a source of synchronization voltage, to the output of which a voltage-driven voltage generator connected to a output driver is connected via a comparator, the source of the reference voltage characterized in that, in order to increase reliability, it is provided with a synchronization key, and the comparator is designed as a differential amplifier on two transistors With a current generator in the emitter circuit, one of the comparator inputs connected to a generator with a sawtooth voltage, the second to the control source voltage, and the third through a synchronization key is connected to a source of synchronization voltage. Sources of information taken into account in the examination 1.Patent of Switzerland No. 534976, cl. H 02 M 1/07, 1972.

2. USSR author's certificate for application no. 2158570/24-07 9 kl.N 02 M 1/08 1975.

lo