SU631908A1

SU631908A1 - Dc voltage stabilizer with overload protection

Info

Publication number: SU631908A1
Application number: SU772478410A
Authority: SU
Inventors: Виктор Иванович Красиков; Михаил Израилевич Каплунов
Original assignee: Предприятие П/Я А-7162
Priority date: 1977-04-21
Filing date: 1977-04-21
Publication date: 1978-11-05

Description

Изобретение относитс к области электротехники , а именно к источникам пнтанн и может быть использовано в системах питани устройств автоматики и вычислительной техники.The invention relates to the field of electrical engineering, namely, to sources of power and can be used in the power supply systems of automation devices and computer technology.

Известны стабилизаторы посто нного напр жени , в которых устройства защиты от перенапр жений выполнены на элементах, отключающих нагрузку от стабилизатора напр жени 1.DC voltage stabilizers are known in which overvoltage protection devices are made on elements that disconnect the load from voltage stabilizer 1.

. Наиболее близким техническим рещением к данному изобретению вл етс стабилизатор посто нного напр жени с защитой от перенапр жени , содержащий включенные последовательно в выходную шину стабилизатора блок со стабилитроном в качестве опорного источника и стабилизирующий узел 2.. The closest technical solution to this invention is a DC stabilizer with overvoltage protection, comprising a block connected in series on the output stabilizer bar with a zener diode as a reference source and a stabilizing unit 2.

Недостатком известного стабилизатора вл етс полное без автоматического возврата отключение нагрузки и стабилизирующего устройства от входного источника питани прн возникновении перенапр жений.A disadvantage of the known stabilizer is a complete, without automatic return, load disconnection and a stabilizing device from the input power source when overvoltages occur.

Целью изобретени вл етс бесперебойна работа стабилизатор а при возникновении перенапр жений.The aim of the invention is to ensure the smooth operation of the stabilizer when overvoltages occur.

Поставленна цель достигаетс тем, что в стабилизаторе посто нного напр жени с защитой от перенапр жени , содержащем включенные последовательно в выходную щину стабилизатора устройство защиты, стабилизирующее устройство, новым вл етс то, что блок защиты выполнен на включенном между входным выводом источника питани и входом стабилизирующего узла первом транзисторе, база которого подключена к коллекторам второго транзистора и через резистор к входному выводу стабилизатора, эмиттер второго транзистора подключен к .выходному выводу стабилизатора, база второго транзистора подсоединена к средней точке переменного резистора, подключенного параллельно стабилитрону, который через резистор подключен параллель-но входным выводам стабилизатора.The goal is achieved by the fact that in a constant voltage stabilizer with overvoltage protection, containing a protection device, a stabilizing device connected in series to the stabilizer output, a new one is that the protection unit is connected between the input terminal of the power source and the stabilizing device. the node of the first transistor, the base of which is connected to the collectors of the second transistor and through the resistor to the input terminal of the stabilizer, the emitter of the second transistor is connected to the output terminal ode of the stabilizer, the base of the second transistor is connected to the midpoint of the variable resistor connected in parallel to the zener diode, which is connected via a resistor in parallel to the stabilizer input terminals.

Claims

The drawing shows a circuit diagram of a constant voltage stabilizer. The DC voltage stabilizer contains a protection unit 1 connected in series and a stabilizing node 2. The protection unit 1 is made on the first transistor 3, the base of which is connected to the collector of the second transistor 4 and through the resistor 5 to the input terminal of the stabilizer, the base of the second transistor 4 is connected to the midpoint a resistor 6 connected in parallel to the zener diode 7, which through a resistor 8 is connected to the input pins of the stabilizer. The constant voltage stabilizer operates as follows. At the rated voltage at the terminals for connecting the load, the first 3 and second 4 transistors are open, since the voltage taken from the variable resistor 6 exceeds the voltage on the load. When the rated voltage of the load is exceeded, the base of the second transistor 4 receives an opening potential with respect to the emitter, which causes the transistor 4 to close, reducing its base and collector currents and the voltage drop across the resistor 5. At the same time, the first transistor 3 closes. internal resistance and take on all excess voltage, as a result of which the magnitude of the voltage on the load remains constant. When overvoltage is eliminated, transistors 3, 4 open to reset. Claims A constant voltage stabilizer with overvoltage protection, containing a protection unit connected in series to the output bus with a zener diode as a reference source and a stabilizing unit, characterized in that, in order to ensure the smooth operation of the stabilizer when overvoltages occur, the protection unit is designed on the first transistor connected between the input terminal and the input of the stabilizing unit, the base of which is connected to the collector of the second transistor and through a resistor to the input transistor water, the emitter of the input transistor is connected to the output terminal, the base of the second transistor is connected to the midpoint of the variable resistor connected in parallel to the zener diode, which is connected through the resistor in parallel to the input terminals. Sources of information taken into account in the examination: 1. Journal of Electronics, No. 9, 1974, p. 67.

2. USSR author's certificate number 428371, cl. G 05 F 1/58, 1972.