SU881893A1

SU881893A1 - Contact-free timer

Info

Publication number: SU881893A1
Application number: SU792742025A
Authority: SU
Inventors: Алексей Сергеевич Алмашин; Борис Мойше-Давидович Пионтак; Николай Маркелович Туганов; Рудольф Геннадьевич Трофимов
Original assignee: Предприятие П/Я А-3771
Priority date: 1979-03-27
Filing date: 1979-03-27
Publication date: 1981-11-15

Description

Изобретение относится к автоматике.The invention relates to automation.

Известно реле времени, содержащее мостовую схему, в одну диагональ которой включен нуль-орган на эквива- _ ленте двухбазового диода, а другая ³диагональ его подсоединена к полюсам источника питания [1].A time relay is known that contains a bridge circuit, one diagonal of which includes a zero-organ on the equivalent of a double-base diode, and the other ³ diagonal of it is connected to the poles of the power source [1].

Однако это реле времени обладает малой помехоустойчивостью, вследствие большой чувствительности нуль-органа ^ик сетевым помехам, а также малой нагрузочной способностью, температурной и временной нестабильностями и недостаточной надежностью.However, this time relay has low noise immunity, due to the high sensitivity of the zero-organ ^and network interference, as well as low load capacity, temperature and time instabilities and insufficient reliability.

Известно бесконтактное реле време- 15 ни, содержащее мостовую схему, в одну диагональ которой включен нуль-орган на'взаимодополнительных р - η - р и η - р - n-транэисторах с разделительным диодом, тиристор, блок ком- 20 мутации тиристора с управляющей цепью, первый и второй диоды, последовательную цепочку из ризистора и стабилитрона, подсоединенную между общей точкой делителя напряжения и *5 управляющей цепью блока коммутации, другую диагональ моста с RC - цепью и делителем напряжения, подсоединенную к полюсам источника питания, и дополнительный диод, подключенный 30 анодом к управляющему электроду тиристора и катодом к точке соединения конденсатора и анода первого диода, включенного в цепь эмиттера η—р—η транзистора нуль-органа [2].A contactless time relay is known, containing a bridge circuit, one diagonal of which includes a zero-organ on the complementary p - η - p and η - p - n-transistors with an isolation diode, a thyristor, a thyristor switching unit with a control circuit, the first and second diodes, a series circuit of a resistor and a zener diode, connected between the common point of the voltage divider and * 5 the control circuit of the switching unit, another diagonal of the bridge with an RC - circuit and voltage divider connected to the poles of the power supply, and an additional d od, an anode 30 connected to the control electrode of the thyristor and the cathode-to-point connections of the capacitor and the anode of the first diode included in the emitter circuit η-p-η-body transistor zero [2].

Недостатком данного устройства является относительная сложность.The disadvantage of this device is the relative complexity.

Цель изобретения - упрощение устройства.The purpose of the invention is to simplify the device.

Поставленная цель достигается тем, что в бесконтактном реле времени, содержащем мостовую времязадающую схему, в одну диагональ которой включен нуль-орган на эквиваленте двухбазового диода, триггер на тиристорах с коммутирующим конденсатором между катодами тиристоров.и резисторами, включенными в катодные цепи тиристоров, два диода, другая диагональ моста через первый диод подключена к катодам тиристоров триггера, при этом коммутирующий конденсатор и один из резисторов триггера образуют фильтр напряжения, приложенного к этой диагонали моста.This goal is achieved by the fact that in a non-contact time relay containing a bridge timing circuit, one diagonal of which includes a zero-organ on the equivalent of a two-base diode, a thyristor trigger with a switching capacitor between the thyristor cathodes, and resistors included in the thyristor cathode circuits, two diodes , the other diagonal of the bridge through the first diode is connected to the cathodes of the trigger thyristors, while the switching capacitor and one of the trigger resistors form a voltage filter applied to this diagonal the bridge.

. На чертеже представлена электрическая схема бесконтактного реле времени·. The drawing shows an electrical diagram of a contactless timer ·

Устройство содержит мостовую времязадающую схему, состоящую из время-.The device contains a bridge timing circuit consisting of time-.

задающей RC-цепи на резисторе 1 и конденсаторе 2, и делителя напряжения на резисторах 3 и 4, образующих одну диагональ моста, в которую включен нуль-орган на транзисторах 5 и 6, триггер на тиристорах 7 и 8 с комму- <· тирующим конденсатором 9 и резисторами 10 и 11, включенными в катодные цепи тиристоров, другая диагональ моста через диод 12 подключена к катодам тиристоров триггера, при ’этом коммутирующий конденсатор 9 и резистор 11 триггера образуют фильтр напряжения, приложенного к этой диагонали моста, диод 13 подключен анодом к управляющему электроду тиристора 7, а катодом к катоду тиристо- 15 ра 8 триггера.the master RC circuit on resistor 1 and capacitor 2, and the voltage divider on resistors 3 and 4, forming one diagonal of the bridge, which includes a zero-organ on transistors 5 and 6, a trigger on thyristors 7 and 8 with a switching capacitor 9 and resistors 10 and 11 included in the cathode circuits of the thyristors, the other diagonal of the bridge through the diode 12 is connected to the cathodes of the trigger thyristors, while the switching capacitor 9 and the trigger resistor 11 form a voltage filter applied to this diagonal of the bridge, the diode 13 is connected by an anode to control electrode thyristor 7 and the cathode to the cathode of thyristors 15 pa 8 of the trigger.

Бесконтактное реле времени работает следующим образом. В исходном состоянии реле выключено, так как тиристоры 7 и 8 заперты. При подаче кратко-20 временного входного импульса положительной полярности на управляющий электрод включается тиристор 7, подключая нагрузку-резистор 10 к сети, и одновременно начинается заряд коммутирующего конденсатора 9 и конденсатора 2 времязадающей RC-цепи. Заряд конденсатора 9 до напряжения сети осуществляется через открытый тиристор 7 и резистор 11, а заряд конденсатора 2 - через открытый тиристор 7, разделительный диод 12, времязадающий резистор 1 и резистор 11. Таким образом, питание моста осуществляется через открытый тиристор 7, RC-фильтр, образованный фильтрующим конденсатором 9 и резистором 11, и разделительный диод 12. Конечный уровень заряда конденсатора 2 определяется потенциалом общей точки делителя напряжения на резисторах 3 и 4, по достижении которого потенциал эмиттера р т- η - ] транзистора 5 становится положительным- относительно его базы, при этом нуль-орган открывается и конденсатор полностью разряжается через открытый нуль-орган, управляющую цепь тиристора' 8 триггера. Тиристор 8 открывается, подключая коммутирующий конденсатор 9 параллельно тиристору 7, в результате чего к тиристору 7 при- jq кладывается обратное напряжение, ко- ‘ торое его запирает, прерывая токContactless time relay operates as follows. In the initial state, the relay is off, since the thyristors 7 and 8 are locked. When a short-20 temporary input pulse of positive polarity is applied to the control electrode, the thyristor 7 is turned on, connecting the load resistor 10 to the network, and at the same time the charging of the switching capacitor 9 and the capacitor 2 of the timing RC circuit starts. The capacitor 9 is charged to the mains voltage through an open thyristor 7 and resistor 11, and the capacitor 2 is charged through an open thyristor 7, a diode 12, a timing resistor 1 and a resistor 11. Thus, the bridge is powered through an open thyristor 7, an RC filter formed by a filtering capacitor 9 and a resistor 11, and a diode 12. The final charge level of the capacitor 2 is determined by the potential of the common point of the voltage divider on the resistors 3 and 4, upon reaching which the emitter potential r p- η -] transistor and 5 becomes positive relative to its base, while the null-organ opens and the capacitor is completely discharged through an open null-organ controlling the thyristor '8 trigger. The thyristor 8 opens by connecting a switching capacitor 9 parallel to the thyristor 7, as a result of which a reverse voltage is applied to the thyristor 7, jq, which locks it, interrupting the current

Р2 нагрузки 10 и питание моста. Диод 12. исключает в этом случае питание моста напряжением противоположной полярности. Тиристор 8 также запирается из-за прохождения через него тока, меньшего тока удержания. Реле возвращается в исходное состояние. Для обеспечения независимости работы реле времени от длительности запускающего импульса служит диод 13, который на время действия импульса выравнивает потен циалы между катодами тиристоров 7 и 8 триггера, исключая ^ем самым заряд коммутирующего конденсатора 9 и конденсатора 2 RC-цепи до.прихохода заднего фронта импульса. Задний фронт импульса снимает приложенный на период действия запускающего импульса положительный потенциал с обкладок конденсаторов 9 и 2, подключая диагональ моста к сети через разделительный диод 12, RCфильтр на фильтрующем конденсаторе 9 и резисторе 11 и открытый тиристор' 7 Использование предлагаемого бес контактного реле временисхемах автоматики позволяет упростить извес ные устройства.P2 load 10 and power to the bridge. Diode 12. in this case excludes the power supply of the bridge with voltage of opposite polarity. Thyristor 8 is also locked due to the passage of current through it, less than the holding current. The relay is reset. To ensure the independence of the time relay operation from the duration of the triggering pulse, a diode 13 is used, which equalizes the potentials between the cathodes of the thyristors 7 and 8 of the trigger for the duration of the pulse, thereby eliminating the charge of the switching capacitor 9 and the capacitor 2 of the RC circuit before the arrival of the trailing edge of the pulse . The trailing edge of the pulse removes the positive potential applied to the period of the triggering pulse from the plates of the capacitors 9 and 2, connecting the diagonal of the bridge to the network through an isolation diode 12, an RC filter on the filtering capacitor 9 and resistor 11, and an open thyristor '7 Using the proposed contactless timer automation schemes can simplify known devices.

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Claims

The invention relates to automatics. A time relay is known, comprising a bridge circuit, in one diagonal of which a zero-organ is connected to the equivalent of a two-base diode, and its other diagonal is connected to the poles of the power source 1. However, this time relay has a low noise immunity, due to the high sensitivity of the zero body to network interference, as well as low load capacity, temperature and temporal instability and insufficient reliability. A contactless time relay is known, containing a bridge circuit, in one diagonal of which is included a null-organ on mutually complementary p - n and p - p - n transistors with a separation diode, a thyristor, a switching unit of the thyristor with a control circuit, the first and second diodes, a series of a resistor and a zener diode, connected between the common point of the voltage divider and the control circuit of the switching unit, another bridge diagonal with an RC circuit and a voltage divider connected to the poles of the power source, and an additional diode, Connecting the anode to the control electrode of the thyristor and the cathode of the capacitor to a point of the compound and the anode of the first diode included in the emitter circuit n-p-n transistor null body

2. The disadvantage of this device is relative complexity. The purpose of the invention is to simplify the device. The goal is achieved by the fact that in a contactless time relay containing a bridge time setting circuit, in one diagonal of which is included a null organ on the equivalent of a two-base diode, a trigger on the thyristors with a switching capacitor between the cathodes of the thyristors and resistors included in the cathode circuits of the thyristors, two diode, another bridge diagonal through the first diode is connected to the cathodes of the trigger thyristors, while the switching capacitor and one of the trigger resistors form a voltage filter applied to this diagon and the bridge. . The drawing shows an electrical circuit of a contactless time relay. The device contains a bridge time driver circuit consisting of an RC driver circuit on resistor 1 and capacitor 2, and a voltage divider on resistors 3 and 4, which form one diagonal of the bridge, in which a zero-body on transistors 5 and 6 is connected on thyristors 7 and 8 with switching capacitor 9 and resistors 10 and 11 included in the cathode circuits of the thyristors, another bridge diagonal through diode 12 is connected to the cathodes of the trigger thyristors, and the switching capacitor 9 and the trigger resistor 11 form a voltage filter applied to at The second diagonal of the bridge, the diode 13 is connected by an anode to the control electrode of the thyristor 7, and the cathode to the cathode of the thyristor 8 of the trigger. Contactless time relay operation em as follows. In the initial state, the relays are turned off, as the mirrors 7 and 8 are locked. When a short-time positive impulse input pulse is applied to the control electrode, the thyristor-7 is turned on, the load-resistor 10 is connected to the network, and the charge of the switching capacitor 9 and the capacitor 2 simultaneously starts charging the RC circuit. The capacitor 9 is charged up to the grid voltage through the open thyristor 7 and the resistor 11, and the capacitor 2 is charged through the open thyristor 7, the separation diode 12, the time setting resistor 1 and the resistor 11. Thus, the bridge is powered through open thyristor 7, RC filter formed by filtering capacitor 9 and resistor 11, and separator diode 12. The final charge level of capacitor 2 is determined by the potential of the common point of the voltage divider on resistors 3 and 4, after reaching which the potential of the emitter p –r n transistor 5 becomes positive with respect to its base, with the null organ being opened and the capacitor completely discharged through the open null organ controlling the thyristor 8 of the trigger. The thyristor 8 opens with the connecting capacitor 9 connected in parallel with the thyristor 7, as a result of which a reverse voltage is applied to the thyristor 7, which blocks it, interrupting the load current 10 and the power supply of the bridge. Diode 12. in this case eliminates the supply of the bridge with the voltage of the opposite polarity. The thyristor 8 is also locked due to the passage through it of a current that is less than the holding current. The relay returns to its original state. To ensure the independence of the time relay operation from the duration of the triggering pulse, a diode is used; 13, which, for the duration of the pulse, equalizes the potentials between the cathodes of the thyristors 7 and 8 of the trigger, excluding the very charge of the switching capacitor 9 and the capacitor 2 of the KS circuit before the back of the pulse. The rear edge of the pulse removes the positive potential applied by the plates of capacitors 9 and 2 for the period of the triggering pulse, connecting the bridge diagonal to the network via a separating diode 12, RC filter on the filtering capacitor 9 and resistor 11 and open thyristor 7 There is no need to simplify the known (dry devices. Claim of the invention. A non-contact time relay containing a bridge time setting circuit, in one diagonal of which a zero-organ per eq is included Dalenchase diode diode, a thyristor trigger with a switching capacitor between the thyristor cathodes and the resistors included in the cathode circuits of the thyristors trigger cathodes of the thyristors, while the switching capacitor and one of the trigger resistors form a voltage filter applied to this bridge diagonal.Sources of information taken into account during the examination 1. USSR author's certificate No. 480130., cl. H 01 H 47/18, 1975. 2 / USSR Copyright Certificate 628547, cl. H 01 H 47/18, 1978.