SU702519A1 - Relay circuit - Google Patents

Description

(54) RELAY

one

The invention relates to a pulse technique, namely to devices, the state of which depends on the magnitude of the input signal voltage; It can be used, for example, in stabilizers with a stepped stabilization of a controlled voltage, as a regulator device that clearly changes its state depending on the level of the input signal, in temperature regulators, etc.

Relays with predetermined response and release thresholds are known, containing input and output stages, an input voltage divider, zener diodes, resistors 1.

In this device, the thresholds for triggering and releasing are set by selecting the threshold levels. The circuit contains two reference diodes included in the emitters of the input transistors; two reference chains consisting of reference diodes and resistors consuming two currents, bias.

The purpose of the invention is to simplify the circuit and expand the range of trigger and release thresholds.

To achieve this, the relay contains an input cascade on two transistors of the same conductivity type and an output cascade on an opposite conductivity type transistor with an executive relay coil in the collector circuit, the input voltage divider to which the base of the first transistor of the input cascade is connected connected via a resistor to the co.plector of the output stage transistor, a zener diode connected between the common power supply bus and the second transistor emitter through the resistor to the negative power supply bus, the collector of the second transistor is connected via resistors to the negative power supply bus and the base of the transistor of the output stage, the emitter of the first transistor is connected to the base of the second transistor, the collector of the first transistor is connected to the input source, the emitter of the transistor of the output stage connected to the negative power supply bus.

five

The drawing shows a schematic diagram of the relay.,

Claims (4)

The transistor 1 of the input circuit is connected by the emitter to the base of the transistor 2, and the collector - through a resistor 3 to 0 bus input signal. The emitter of transistor 2 is connected to the common bus through Zener diode 4, and the collector to the emitter power bus of the output transistor 5 through the resistor 6 and to the base of transistor 5 through the resistor 7. The collector of the output transistor is connected to the common bus through the winding 8 of the executive relay, and to the base of the first transistor — through a resistor 9; a divider consisting of resistors 10 and 1.1 is connected between the input bus and the common bus. Its average is connected to the base of the transistor. The resistor 12 is connected between the anode of the Zener diode 4 and the emitter of the transistor 5.. When the supply voltage is applied, all transistors are closed, since the voltage from Zener diode 4 closes transistor 2, which means that transistors 5 and 1 are also closed. When the input signal is fed through a divider consisting of resistors 10 and 11, current flows The voltage drop across resistor is 11 polarity opposite to the voltage from Zener diode 4, and transistor 2 is locked. When the voltage on resistor 11 exceeds the voltage on Zener diode 4, tracer 13 opens and a current flows through it, which is separated and directed through resistors b and 7, and therefore through the control junction of the transistor 5. The latter opens, the relay appears on the winding 8, and the current through the choke 9 and the base of transistor 1, which opens, increases even more the base current of the transistor 2. Since resistors U and 3 are connected in parallel, the latter even more fails, transistor 5 opens even more, i.e. there is an avalanche process. opening all three transistors, and relay 8 turns on. - With a further increase in input voltage, the state of the relay does not change. When the input voltage decreases at the resistor 11 or at the base of transistor 2, the voltage starts to decrease, and its difference decreases with the voltage from the zener diode 4. The relay is released at the moment when the input voltage at the base of the transistor penises to the same level as wherein this transistor closes. The process of pushing off the relay also takes place, so that {Hack the transistor 5 starts to close, which causes the transistor 1 to close, and this causes the transistor 2 to close even more, and accordingly the transistor 5. The executive relay releases and all the transistors close. The trigger threshold, the upper level of the input voltage is selected by a divider from resistors 10 and 11, i.e. You can use a variable resistor, and the release threshold of the relay, the lower level of the input voltage, resistor 3, i.e. Also, you can set a variable resistor. The transistor 1 in this device performs two functions — as a positive feedback signal amplifier, which increases the stability of operation, and as a key, which changes the dividend transfer coefficient of resistors 10, 11 and 3. Resistor 12 provides bias current for Zener diode 4. Claims of the invention A relay containing an input cascade on two transistors of the same type of conductivity and an output cascade on an opposite type of transistor wire; cascade is connected through a resistor to the collector of the output stage transistor, a zener diode connected between the common power supply bus and the emitter of the second transistor connected via a resistor to the negative power supply bus, the collector of the second transistor is connected through the resistors to the negative power supply bus and the base of the transistor of the output stage, so that, in order to simplify the circuit and expand the range of trigger thresholds and release, the emitter of the first transistor is connected with the base of the second, the collector of the first transistor is connected to the input source, the emitter of the output stage transistor is connected to the negative power supply bus. Sources of information taken into account in the examination 1. USSR author's certificate in accordance with the application 2051657, cl. H 03 K 3/295 09.08.77. 702519