SU495724A1 - Time relay - Google Patents

Description

the pulse generated at the first moment blocks the diode 5, thereby excluding the false triggering of the zero-organ 6.

At time 2, the zener diodes 3 and 4 are punched, and at the midpoint of the divider voltage, the voltage is set to correspond to the threshold of the relay.

Voltage 5 on diode 5 is always equal to the difference between voltage drop and zener diode 4 and voltage on condenser 2.

 Since the time constant of the charge circuit, consisting of resistor 1 and capacitor 2, is large, then we can assume that at time t, a reverse i5 current is applied to diode 5, equal to the voltage on the zener diode 4.

At the moment / 3 corresponding to the amplitude value of the half-wave of the supply voltage, the charging current of the capacitor 9 is stopped and the transformer 7 is out of saturation. In the secondary winding, a reverse pulse is formed, approximately equal in amplitude to the direct one. The locking voltage of the diode 5 (Ub) at this moment decreases by the magnitude of the reverse pulse. However, if the transformer parameters are chosen such that the reverse pulse impulse in the secondary winding is maximum possible, defined by the relation (1), will be less than the voltage across the zener diode 4, this will not cause a false relay triggering.

In the time interval, the capacitor 9 is discharged and the magnitude of the ALVg, and the core of the transformer 7 is demagnetized by its discharge current.

At time 4, the half-wave of the supply voltage starts to exceed the voltage on the capacitor 9 and it is dispensed through the primary side of the transformer.

In this case, a pulse is formed in the secondary winding, determined by the removal of

U, (W,): MJ, And / 1

After the capacitor 9 is measured, the current in the winding Wi stops and a reverse pulse is formed in the winding W-2, approximately equal in amplitude to the direct current.

Thus, thanks to a new functional EI between the filter coidifier 9 and the primary winding of the pulse transformer 7 in the secondary winding, which is included in the diagonal of the measuring bridge, narrow radiation impulses are formed with a frequency corresponding to 1, its pulsation frequency of the straightened beam, i.e. the capacitor 9, of its primary purpose, performs the functions of a switching pulse generator, which simplifies the relay circuit.

When the voltage of the co-capacitor 2 (IC) and trips to the threshold U, then at some point the diode 5 is exchanged in the direction and direction of the switching pulse of the transformer 7, and

is the reverse pulse. If the value of commutation of it is l m / l, determined by the ratio

e „r - 6-4 --- and - and, (U.,)

(3)

If the AL / 6C zero-organ triggers, then the latter overturns, causing the actuator to trigger 11.

In the relay circuit, it is necessary to use transformers that have the smallest gabrnty, i.e., the product (where S is the cross-section of steel). This prevents the noticeable effect of the transformer on the operation of smoothing 1, its filter, and eliminates the possibility of the relay hanging at the operation point. The switching pulses should be as short as possible. The lower limit of the dimensions of the transformer is limited by the voltage and the response current of the null organ.

If the irviepoTcn network has large fluctuations in the power supply of its voltage, then the reverse (commuting) pulse can be stabilized by diode 12. The value of the direct pulse does not affect the accuracy of the relay and, therefore, does not need to be stabilized.

Simplification of the circuit and reduction of the dimensions of the relay is achieved by the fact that the commutator of the commutator of commutated pulses with large downhole is performed not by a system of zener diodes and resistors, but by a filter capacitor, including blues and consequently;

K.d. The relay rises due to the fact that the current through the winding winding of the transformer does not flow through the entire half-period, but only during a short pulse of the filter capacitor to the amplitude value of the voltage of the titanium. As a result, there is no need for high resistances, on which a large amount of my weight is allocated. In addition, the power and size; a 1-pulse transformer is limited only by the power that is needed to trigger the null organ.

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Time relay, containing imiulsny transformer and bridge circuit with time for 1 / C-type and divider type B; enia sci-diodes with bridge shoulders, semiconductor diode and null-organ in one diagonal bridge, extractor and smoothing type-C-f 1ltrom in the other diagonal of the bridge, of which it is. for the purpose of elevation to D. and the shekelta, the nervous winding of the pulse transformer is connected along with a cooling system with a smoothing / C-filter, and secondly - into the diagonal of the janitor in sequence with an n-organ.

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