SU400984A1 - DELAY DEVICE - Google Patents

Description

one

The invention relates to a pulse technique and can be used in automation, converter and measurement technology.

A known delay device containing a time setting RC circuit connected via a thyristor to the source power poles, a transistor block generator whose transformer contains two additional boost windings, a zener diode included: In reverse polarity between the base of the transistor blockNG- the generator and the connection point of the resistor and capacitor of the KS circuit, the discharge time of the master capacitor formed by the series-connected choke and thyristor connected by a control / bending electrode to one This additional step-up transformer winding is uneconomical and has low reliability.

The purpose of the invention is to increase the economy and reliability of the delay device.

For this, the second step-up winding of the transformer of the block generator is connected to a turn diode parallel to a resistor connected in series with the startup thyristor and parallel to the RC circuit.

FIG. 1 shows the basic electrical circuit of the proposed delay device; in fig. 2 - voltage diagrams for the operation of the delay device.

The delay device contains a time-dependent RC-day, consisting of a resistor /

and a capacitor 2 and connected via a thyristor 3 to the power source. The blocking device generator is assembled on a transistor 4 and a transformer 5, which has a primary winding 6, a reverse winding 7

connection, the output winding 8 and two step-up windings 9 and W. Between the base of the transistor 4 and the connection point of the resistor / capacitor 2 is connected a zener diode 11 anode to the base of the transistor 4. The discharge circuit of the capacitor 2 consists of throttles 12 and a thyristor 13, controlling the electrode of which through a resistor 14 is connected to the step-up winding 9 of a transformer 5. The step-up winding 10 of a transformer 5 through a diode 15

connected in parallel to the resistor 16, which is connected in series with the thyristor 3 start.

Diodes 17, 18 and 19, resistors 20, 21 and 22 provide the necessary modes of the circuit

blocking generator.

The delay device works as follows. Suppose, at time t (see Fig. 2), the input pulse t / Bx unlocks the triggering thyristor 3. Capacitor 2 starts

charge through a resistor. At time f2, when the voltage on capacitor 2 reaches the threshold level t / nop. detected by the ochoiBHOiM zener diode //, the following occurs:

a) the blocking generator is activated;

b) the impulse on the up-winding 10 t) of the transformer 5 overwrites the thyristor 5;

c) a pulse from the winding 9 of the transformer 5 is unlocked by the thyristor 13, resulting in an oscillatory overcharge of the capacitor 2 along the circuit: the top plate of the capacitor 2, the choke 12, the thyristor 13, the plate of the capacitor 2. The voltage on the capacitor 2 takes the field The pharity shown in FIG. 1, and the thyristor 13 is locked, after which the device is ready for the next start.

With the arrival of the next trigger pulse, all the processes in the software | Secondary pattern.

The resistor 16 provides the holding current of the thyristor 3 and removes the limitations imposed by this current and the magnitude of the resistor 1 is the time of the driving circuit.

In standby mode, all the elements of the delay device circuit are de-energized, which increases the efficiency and reliability of the device.

Pulses They are fed to the input 23 of the delay device.

The notation in FIG. 2:

/ 2 is the voltage across the capacitor 2;

the voltage of the anode-cathode of thyristor 3; the voltage across the winding 10 of the transformer 5;

thyristor anode voltage 13.

Prev ivr e t inventions

A Zadlersky device, containing a time driving a KS circuit, connected via a start thyristor to the poles of a power source, a transistor blocking generator, the transformer of which contains two additional windings, one of which is boosting, a zener diode connected in the reverse polarity between the base of the transistor the blocking generator and the point of connection of the resistor and co-detector KS - circuit, the discharge circuit is the time of the driving capacitor, which is formed in series with the choke and the thyristor connected by the control electrode Ohm to one of the additional windings of the transformer, characterized by

that, in order to increase the efficiency and reliability of the device, in it the additional step-up winding of the blocking generator transformer is connected through a diode in parallel with a resistor connected in series with the start thyristor and parallel to the RC circuit.

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FIG. 2