SU554568A1 - Time relay - Google Patents

Description

one

The invention relates to automation and pulsed tech, in particular to a thermostable transistor time relay.

A Time Relay is known, which contains the time of the C-circuit, the output of which is connected to the zero-or-go input, the first and second power thyristors and the elements for switching them on.

However, this time relay does not allow the power thyristors to be switched off sequentially with the required time delays, but makes a simultaneous shutdown of the thyristors by disconnecting from the power source.

With the aim of consistently turning off the indicated power thyristors with the required time delays, the proposed time relay introduced three additional thyristors, two transistors with pnp conductivity, one transistor with pnp conductivity, two additional C-targets, two condoms and pulse generator made in a bridge circuit with a time setting RC-nenbio and a resistive divider in the shoulders of the bridge and a null organ in its diagonal, with additional KS-C & pi connected between the plus power supply bus and the anodes of the primary first and second power thyristors, respectively, the output of the first additional / C-circuit is connected to the anode of the first additional thyristor through the collector-emitter junction of the transistor pnp conductivity, the base of which is connected to the anode of the second power thyristor, the output of the second additional C-circuit is connected to the anode of the second additional thyristor directly, the control electrodes of the power thyristors are connected to the output of the pulse generator, and their cathodes through additional capacitors are connected to the midpoint of the cutting The stent divider of the pulse generator, the base of the first transistor, the pnp conduction, is connected to the anode of the second power thyristor, the emitter - to the plus bus of the n-it source, and the collector - to the control electrode of the third additional thyristor, the cathode of which is connected to the input the pulse generator, and the iod through the collector-emitter junction of the second additional transistor pp-rd wire is connected to the positive power supply bus, the base of this transistor is connected to the anode of the first power thyristor.

The circuit diagram shows the electrical circuit of the time relay.

The time relay contains the time set by / C-tcp pa resistor 1 and capacitor 2, the common point of which is connected to the base of the single junction tra 1 of the zero-organ 3, power thyristors 4 and 5, the elements of their inclusion in the form of .RC-circuits on resistors 6 and 7 , konden3

8 and 9, additional thyristors 10-12, transistors 13 and 14 pp conductivity, transistors 15-17 pp p conductivity, additional: capacitor C-circuits on resistors 18 and 19 and capacitors 20 and 21, respectively, capacitors 22 and 23, diodes 24-32, an immunity generator, including an electric bridge, (in the first arm of which is included a / c-p) on resistor 33 and capacitor 34, in the second - divider on resistors 35 and 36, and in the diagonal - a zero-body transistors 37 and 38 and a diode 39, a positive bus 40 and a negative width 41 to the power supply, the winding 42 of the executive relay , resistor 43-50, and the bus 40 is connected through resistors 1, 46, 18, 47, 6, 49, 19, 7 and winding 42, respectively, with the emitter of transistor 3, its first base, collector of transistor 16, the thyristor anode 4, the transistor 15, the base of the transistor 13, the anode of the thyristor 12, the collector of transistor 17 and the anode of the transistor 5, as well as directly to the emitters of transistors 13 and 14, the collectors of which are connected respectively to the anode of the thyristor 11 n resistor 50, the other output is connected to the control panel thyristor II, its cathode is connected to a common The points of resistors 33 and 35, the other terminals of which are the bridge diagonal and are interconnected via a series circuit of capacitor 34 and resistor 36, as well as through the emitter-base transition of transistor 37, the collector of this transistor is connected to its base The basic transition of the transistor 38, the emitter of which is connected via diodes 25, 28 and 39, respectively, to the control electrodes of the thyristors 10, 12 and 41, connected directly to the common wheelbarrow of the capacitor 34 and resistor 36, and through the diode 32 to cathodes of diodes 24, 27 and 30, en Dami diodes 26 and 29 and the base of the transistor 15, the collector of which is connected through diode 31 to the collector of transistor 17 connected to its emitter through capacitor 9, the anodes of diodes 24, 27 and 30 are connected respectively to the common emitter point of Transstar 15 and capacitor 2, the cathode is the common point of the cathode of the thyristor 4 and the capacitor 8 and the common point of the cathode of the thyristor 5 and the capacitor 9, the cathodes of the diodes 26 and 29 are connected respectively to the control electrodes of the thyristors 4 and 5, the anodes of which are connected via a capacitor 20 and 21 respectively to the collector transistor 16 and the anode of the thyristor 12, the total point of the resistors 35 and 36 is connected through capacitors 22 and 23 respectively to the cathodes of the thyristors 4 and 5 are connected to the cathodes of the thyristors 10 and 12.

The relay works as follows.

When connected to the power supply 40, 41, the capacitor 2 is charged through the resistor 1, the capacitor 8 is charged simultaneously through the resistor 6. As soon as the voltage on the capacitor 2 exceeds the turn-on voltage of the single junction transistor 3, co4

the resistance of its emitter-second transition decreases like an avalanche base, and the capacitor 2 discharges. along the circuit: the emitter-NT transition The base of the transistor 3 is a base-emitter transition

the transistor 15. The capacitor 8 is discharged through the collector-emitter junction of the transistor 15, the diode 24, the diode 26 and the thyristor control switch 4, which leads to the inclusion of this thyristor. At the same time, the transistor 13, whose base is connected through a thyristor 4 to the negative terminal 41, goes into conduction state. Next, the charging process of the capacitor 2 is repeated.

After turning on the thyristor 4 is closed

TpaiH3HCTOip 17, a bypass capacitor 9 that is charged. Upon reaching on the capacitor 2 the turn-on voltage of the transistor 3, the capacitor 2 is again discharged through the control electrodes of the transistor 15,

putting it in the open state, while the capacitor 8 is again discharged through the control transition of the thyristor 4, does not change its state.

Simultaneously through the transistor 15, the diode

24, the diode 29 and the thyristor control transition 5 unloads the capacitor 9, so that the thyristor 5 opens, the coil 42 of the electromagnetic relay is connected to the power buses 40, 41, and its contacts fix the end of time.

Turning on the thyristor 5 also turns on the thyristor I. Due to the open state of the transistor 13 and the thyristor 11, the generator at transistors 37, 38 is connected to the positive bus 40. As a result, the capacitors 22, 23 are charged to a voltage equal to the voltage drop on the resistor 36. At the same time, the capacitor 34 begins to charge through a resistor 33. As soon as

the voltage on the capacitor 34 will exceed the voltage on the resistor 36, the transistor 37 opens. Since the collector current of this transistor is also the base current of the transistor 38, both transistors turn avalanche-like in the conductive state, while the transistor 38 shunts the collector the emitter of resistor 36, as a result of which the capacitors 22, 23 are discharged along the circuit: a collector-emitter junction of the transistor .38, a uranium transfer of the additional thyristor 10 (for the capacitor 22) and a control junction th thyristor 12 (for the capacitor 23) for scrubbing atom occurs both thyristors.

Since the thyristor 12 is connected to the capacitor 21 previously charged through the resistor 19, this capacitor is discharged through the thyristor 12 and the cathode-anode transition of the thyristor 5. Due to this, the thyristor 5 is closed. At the end of the discharge of the capacitor 21, the thyristor 12 is also closed, since its anode current, limited by the resistor 19, is chosen to be smaller than the holding current.

By discharging the capacitor 23 for a short time, the thyristor 10 also opens. However

Since the anode is connected to the closed transistor 16, neither the discharge of the capacitor 20 nor the power of the thyristor 4 occurs.

So, as the generator of the pulses remains connected through the transistor 13 and the thyristor II to the positive bus 40 after the thyristor 5, then after a certain time specified by the / C-circuit. On the resistor 33 and the capacitor 34, the transistors 37, 38 are again in a saturated state and, the capacitors 22, 23 are re-discharged through the thyristors 10, 12 control transitions.

After the thyristor 5 is locked, the transistor 16 is closed and the conditions for unlocking the thyristor 10 are created. Ka: to only at the time of the secondary charge of the capacitor 34, the transistors 37, 38 go into the open state and the capacitors 22, 23 go through control transitions additional thyristors 10, 12, capacitor 20 is discharged through a collector-emitter junction of transistor 16, thyristor 10 and a cathode-anode junction of thyristor 4, which is closed.

Thus, the proposed time relay allows the thyristor 5 to be switched off sequentially and then the thyristor 4, although the switch-off sequence can be changed in principle if the control leads of the transistors 14 and 16 are connected to the anode of the thyristor 4 and the transistor 13 to the anode thyristor 5.

Claims (1)

Invention Formula A time relay containing the time setting RC-iifiUb, the output of which is connected to the input of a null organ, the first and second power thyristors, the elements for switching them on, from and in order to provide successive switching off of the indicated power thyristors with the required time delays, three additional thyristors are introduced into the device, two transistors pnpr conduction, one conduction transistor, two additional C-depi, two capacitors and a pulse generator, performed by a bridge circuit with time defining an RC circuit and a resistive divider in the arms the bridge and the zero-organ in its diagonal, with additional C-cePI connected between the plus bus power source and the anodes of the first and second power thyristors, respectively, the output of the first additional The C-circuit is connected to the anode of the first additional thyristor through a collector-emitter junction of the n-conduction transistor, the base of which is connected to the anode of the second power thyristor, the output of the second additional / C-circuit is connected to the anode of the second additional thyristor directly; thyristors are connected to the output of the aforementioned pulse generator, and their cathodes through these additional capacitors are connected to the midpoint of the resistive divider of the pulse generator, the base of the first tr the anistor of the conduction potential is connected to the anode, the second power thyristor, the emitter to the plus bus of the power source, and the collector to the control electrode of the third additional thyristor, the cathode of which is connected to the input of the pulse generator, and the anode through the collector-emitter junction of the second additional transistor ppn conduction - with a positive power supply bus, the base of this transistor is connected to the anhedom of the first power thyristor.