SU660252A1

SU660252A1 - Dc switch

Info

Publication number: SU660252A1
Application number: SU772441512A
Authority: SU
Inventors: Виктор Альфонсович Биккард; Андрей Евдокимович Берсенев; Иван Нестерович Ушко; Евсей Зиновьевич Дивинский
Original assignee: Предприятие П/Я М-5842
Priority date: 1977-01-10
Filing date: 1977-01-10
Publication date: 1979-04-30

Description

1one

Устройство относитс к импульсной технике, в частности к устройствам коммутации цепей посто нного тока при помощи управл емых бесконтактных элементов, например тиристоров по схеме статического ключа с наличием гас щего конденсатора, и может быть использовано в технике св зи, автоматике, телемеханике и вычислительной технике.The device relates to a pulse technique, in particular, to devices for switching DC circuits using controlled contactless elements, for example thyristors according to a static switch with a damping capacitor, and can be used in communication technology, automation, telemechanics and computer engineering.

Известны устройства коммутации цепей посто нного тока при помощи управл емых бесконтактных элементов , содержащие управл емые бесконтактные элементы коммутации, цепи управлени 1.Switching devices of direct current circuits are known by means of controlled contactless elements, comprising controlled contactless switching elements, control circuits 1.

Недостатком их вл етс невозможность автоматического выключени при включении устройства кратковременными импульсами помех.Their disadvantage is the impossibility of automatic switching off when switching on the device by short impulses of interference.

Известен также включатель постоного тока, содержащий тиристор, в катодную цепь которого включена нагрузка, первый управл емый ключевой элемент, который подключен между анодом и управл гадим электрдом тиристора, конденсатор, первый вывод которого через второй управл емый ключевой элемент соединен с положительной шиной питани и череAlso known is a post-current switch containing a thyristor, the cathode circuit of which includes a load, the first controlled key element that is connected between the anode and the control of the thyristor electrodes, the capacitor, the first terminal of which is connected to the positive power bus and through the second controlled element

резистор с отрицательной шиной питани 2 .negative busbar resistor 2.

Недостаток этого устройства состоит в невозможности автоматическогоThe disadvantage of this device is the impossibility of automatic

выключени при включении устройства кратковременными импульсами помех.turn off when turning on the device short-term pulses of interference.

Цель изобретени - автоматическое выключение при включении устройства кратковременными импульсами помех.The purpose of the invention is to automatically turn off when the device is turned on with short-term pulses of interference.

Дл этого во включатель посто нного тока, содержащий тиристор, в катодную цепь которого включена нагрузка , первый управл емый ключевой элемент, который подключен междуTo do this, the DC switch containing the thyristor, in the cathode circuit of which a load is included, is the first controlled key element that is connected between

анодом и управл ющим электродом тиристора , конденсатор, первый вывод которого через второй управл емый ключевой элемент соединен с положительной шиной питани и через резистор с отрицательной шиной питани , дополнительно введены транзистор, между базой и эмиттером которого включен диод, третий управл емый ключевой элемент, который подключенthe anode and control electrode of the thyristor, the capacitor, the first output of which is connected via a second controlled key element to the positive power line and through a resistor to the negative power line, is additionally inserted a transistor, between the base and the emitter of which a diode is turned on, the third controlled key element that connected

между базой транзистора и отрицательной шиной питани , и диод, включенный между коллектором транзистора и управл ющим входом второго управл емого ключевого элемента. При этомbetween the base of the transistor and the negative power line, and a diode connected between the collector of the transistor and the control input of the second controlled key element. Wherein

Claims

the emitter of the transistor is connected to the cathode of the thyristor, and the base With the second output of the capacitor. FIG. Figures 1 and 2 show DC switch configurations. It contains a controlled contactless element - a thyristor 1 with a key element 2 in the control circuit, a load 3 connected in series with the controlled element and the power source 4, a chain of successively connected limiting resistor 5 and an extinguishing capacitor 6 connected from the side the resistor to the connection point of the load and the power source, a key element 7 connected between the connection point of the quenching capacitor b and the limiting resistor 5 and the source 4 of the power supply, blocking the transistor 8 and connected to the circuit e additional key element 9. The transition emitter-base of the blocking transistor 8 is bounded by a diode 10 and connected between the connection point of the controlled element - thyristor 1 with load 3 and RC chains from the resistor 5 and capacitor 6 on the side of the capacitor 6, and its collector Another diode AND is connected to the base circuit of the key element 7. The circuit in FIG. .2 differs from the circuit shown in FIG. 1, those, h contact key including elements 2 and 9 are replaced by transistor key elements. In addition, in order to reduce the voltage applied to the transistors of the key elements 2, 7 and 9, decoupling diodes 12, 13 and 14 are introduced into the collector circuits of the transistors of the key elements 7, 2, 9, and the opposite ends These circuits are connected to the midpoint of the power source. In addition, a circuit consisting of a series-connected Zener diode 15 and a diode 16 is introduced in series. It connects the junction point of the quenching capacitor 6 and the limiting resistor 5 to the junction point of the thyristor anode 1 and the power source 4. The DC switch operates as follows. When the control signal is applied to the input of the device, the key elements 2 and 9 are closed at (ig. 1 and the transistor of the key elements 2 and 9 goes into saturation mode in FIG. Thyristor 1, which turns on the load current, and then the transistor 8 Through the cathode-anode thyristor 1 transitions and the emitter-base of transistor 8, a positive potential is applied to the base of the transistor of the key element 7. The last is closed. The damping capacitor b is charged through the resistor 5. This state is maintained until device is given a control signal When the control signal is removed from the device input, the contacts of the key elements 2 and 9 in Fig. 1 are opened and the transistors of the key elements 2 and 9 in Fig. 1 are closed.

2. The blocking transistor 8 closes and removes the positive potential from the base of the transistor of the key element 7. The charged capacitor opens and connects through its emitter-collector junction and diode 10 parallel to the anode-cathode thyristor 1. The thyristor 1 turns off, receiving a pulse from the capacitor 6 reverse voltage. In the case of spontaneous switching of the thyristor 1 in the absence of a control signal at the input of the device for the time of charging the capacitor 6, the blocking transistor 8 opens, receiving power through the anode-cathode transition of the thyristor 1. Transistor 8, supplying positive potential to the base circuit of the transistor of key element 7 blocks it until the capacitor 6 is charged. After its charging, the blocking transistor-8, when closed, removes the positive potential from the base of the transistor of the key element 7. Element 7 opens and connects the charged to the capacitor to the transition of the cathode-anode of the thyristor 1, the latter is turned off. Thus, a full charge of the extinguishing capacitor is ensured in case of accidental switching on. a thyristor with an impulse of any long-lasting, and reliable shutdown by its reverse voltage capacitor. The holding time of the thyristor in the on state is equal to the duration of the interference pulses, but not less than the charging time of the capacitor. The invention includes a direct current switch containing a thyristor, the cathode circuit of which includes a load, the first controlled key element that is connected between the anode and the control electrode of the thyristor, a capacitor, the first input of which is connected to the positive power bus and through the second controlled key element through a resistor with a negative power bus, characterized in that, in order to automatically turn off when the device is turned on, short-term impulses of interference are additionally introduced a transistor, between the base and the emitter of which a diode is turned on, the third controlled key element that is connected between the base of the transistor and