SU493826A1 - Time relay - Google Patents

Description

the cathode of thyristor 4 and the anode of diode 5. In the collector circuit of transistor 15, an actuating relay 16 is turned on. Resistor 17 and capacitor 18 form the time of the master / C-circuit. The base of the single junction transistor 19 (zero-organ) is connected to the connection point of resistor 17 and capacitor 18. The output stage is assembled on the thyristor 20, in the anode circuit of which electromagnetic relay 21 is connected. The collector of transistor 22 is connected to the resistor 17, and the base is connected to the thyristor anode 9 , in the anode circuit of which the relay 23 is connected.

The time relay works as follows.

When the relay is connected to the power source, charging time of the driving capacitor 2 starts. Simultaneously, the capacitor 7 is charged. The capacitor 12 is bounded by a collector-emitter junction of the saturated transistor 13 and therefore does not charge. The saturation mode of the transistor 13 is provided by the current flowing through the resistors 24, 25 and the zener diode 14. The capacitor 18 is also not charged. As soon as the voltage on the capacitor 2 becomes sufficient to turn on the one-junction transistor 3, the emitter-to-first junction resistance of the transistor decreases avalanche-like c f. This leads to the discharge of the capacitor 2 through the resistor 8. As a result, the transistor 3 opens and the capacitor 7 is discharged along the circuit : diode 26, collector-emitter junction of transistor 8, diode 27, diode 28, thyristor 4, transistor 15. This leads to the switching on of the thyristor 4. Simultaneously with turning on the thyristor 4, the transistor 15 opens, thereby triggering a relay 16. The thyristor 9 at this time not turned on because the capacitor 12 is charged was not.

When the thyristor 4 is turned on, the transistor is locked. 13, and the capacitor 12 begins to charge.

Since the time constant of the circuit from capacitor 7 and resistor 6 is much shorter than the time constant of the resistor 11 and capacitor 12, when the single junction transistor 3 is turned on again due to the discharge of the capacitor 2, the capacitor 12 will open again.

As a result, the discharge capacitor 12

the thyristor 9 is turned on, the electromagnetic relay 23 is activated. Simultaneously with the switching on of the thyristor 9, the transistor 22 opens, and the charge of the capacitor 18 begins. As

only the voltage on the capacitor 18 reaches a value equal to the switching voltage of the unijunction transistor 19, the emitter-first junction resistance decreases avalanchely, the capacitor 18 is discharged through the thyristor control junction 20. As a result, the thyristor and the electromagnetic relay 21 are triggered.

Subject invention

Claims (3)

1. A time relay containing the first time specifying a C-circuit, a null-organ, an output stage on the first thyristor with a diode in the cathode circuit, an additional C-circuit connected to the thyristor cathode, a transistor whose collector is connected to the midpoint of the additional C-circuit characterized in that, in order to double the time delay, it contains a second thyristor with a diode in the cathode circuit, the second additional / C-circuit connected between the positive power supply bus and the cathode of the second thyristor, the p – p transistor transistor, and the collector – emitter section of this transistor is connected in parallel to the second additional C – depy capacitor, and the base is connected with the anode of a nerve thyristor. 2. Relay pop. 1, characterized in that, in order to increase the stability of the time delay, the base of the p – p – p transistor is connected to the anode of the first thyristor via a zener diode. 3. The relay according to claim 1, characterized in that, in order to use the relay as a software one, it contains a second additional transistor, n - p - / g -conductivity with an executive relay in the collector circuit, the base-emitter portion of said transistor being connected between the cathode of the first the thyristor and the diode anode, the second time giving the C-circuit, a zero-body, an output stage on the thyristor with an electromagnetic relay, the transistor pn - p-conductive, the collector of which is connected to the resistor mentioned 1 / C-circuit, and the base - with the anode of the second thyristor.