SU531210A1 - Time relay - Google Patents

Description

(54)

TIME RELAY

the transistors 7 and 8. The load of the transistor 8 is a relay 9.

Zener diode 10 is connected to the emitter circuit of the control transistor 5. Parallel to it, the collector-emitter transistor 12 is connected via an adjustable resistor 11, the base of which is connected to the starting device 4. Between the collector of the input transistor 3 and the time of the driving capacitor 2, a diode 13 is applied in the conductive current charge capacitor direction. The relay output is connected to the collector of transistor 8.

The time relay works as follows.

In the initial state, in the absence of input pulses, transistors 3 and 12 are open by current flowing through resistor 14. Condenser 2 is discharged, control transistor 5 is closed. The emitter potential of transistor 5 is equal to the collector potential of the open transistor 12 and is close to zero. The Zener diode 6 is broken, and the current flowing through the resistor 15 is fed to the trigger input. At the base of the transistor 7, there is a negative voltage, and the transistor is open. The transistor 8 is closed, and the executive relay 9 is de-energized.

When a signal is received from the starter 4, transistors 3 and 12 are closed, and capacitor 2 starts charging through resistor 1 and diode 13. When the relay is started, the emitter potential of transistor 5 due to closing of transistor 12 becomes equal to the potential of the zener diode 10, which creates a threshold for opening transistor 5. The stabilization voltage of the Zener diode 6 is greater than the stabilization voltage of the Zener diode 10, therefore when open the transistor 5 it goes into a non-conducting state. The current flow to the trigger input is stopped, the transistor 7 is closed, the transistor 8 is open, and the executive relay 9 is triggered.

The deceleration time for the operation of the relay 9 is determined by the capacitance of the capacitor 1, the resistance of the resistor 1, and the voltage across the breakdown of the zener diode 10.

When the input signal is terminated, transistors 3 and 12 open. The transistor 5 continues to be in the open state under the action of the discharge current of the capacitor 2 flowing through the circuit: plus source, emitter-collector junction of transistor 12, resistor I, emitter-base junction of transistor 5. At the same time, the diode 13 is covered by the voltage of the capacitor 2 and prevents its discharge through the transistor 3.

As the capacitor 2 is discharged, transistor 5 closes, the starter returns to its initial state, and relay 9 releases.

The duration of deceleration and release is determined by the capacitance of the capacitor 2 and the resistance of the resistor 11. By varying the resistance of the resistor 11, the necessary deceleration to release can be obtained.

Claims (1)

Invention Formula A time relay containing a time setting RC circuit, with an emitter-collector junction of an input transistor connected in parallel with the capacitor, the base of which is connected to a starting device, a control transistor connected to the RS-circuit, two zener diodes connected, and the second of them is connected between the collector of the control transistor and an output trigger input with an executive relay as a load, characterized in that, with increasing stability of time exposures, the first zener diode is connected to the emitter circuit of the control valve Anisistor, while parallel to the Zener diode is connected through an adjustable resistor to the collector-emitter junction of an additional transistor, the base of which is connected to the starting device, and between the collector of the input transistor and the time the capacitor turns on the diode in the direction of the charge-carrying current of the capacitor.