SU683021A1 - Time relay - Google Patents

Description

The invention relates to automation and is designed to delay the disconnection of power devices after a short pulse is input to the input, including those devices.

Devices are known that contain a trigger with an em: itte1 :: Noah connection, an additional cascade on a zero-transistor with a Parallel time specifying an RC circuit connected between the collector of one of the transistor and the tritger via a diode and power supply 1.

However, in these devices, the dwell time may not be longer than the time of the master / C-target.

IzBpsgsy time relays containing a field crznietor. The sequence time is given by the RC-emitter, the trigger with the emitter link and the diode 2.

The aim of the invention is to increase the exposure time.

DOST: This is due to the fact that the device containing the field-effect transistor is subsequently. Attendant time / C-value, connected by a midpoint to the control electrode of the Field-effect transistor, and a capacitor - to the power bus, parallel to the resistor of which the diode is connected, the trigger with the emitter connection of the first and second transistors with electromagnetic

the relay as a load, the source of the field trap of the resistor is connected through a resistor to the collector of the first transistor, the drain is connected to the base of the Bgory transistor, and the resident driver connects the C / C circuit to the collector of the first transistor.

The drawing is a schematic diagram of the device.

The device contains a field-effect transistor /, time zaduyvuyu / C-circuit, SO | Sto Plyuyu OF resistor 2 and capacitor 3, the trigger on transistors 4 and 5, resistors 6-11, electromagnetic relay 12, capacitors 13, 14, diode 15.

The capacitor 13 serves to accelerate the process of triggering the trigger.

The device works as follows. When the power is supplied with the polarity indicated in the drawing, transistor 4 opens, since it has a large base current at that moment due to the connection to the base of the capacitor 14, and transistor 5 is closed, because at its transition the emitter - base has a reverse bias from resistor 6.

The capacitor 3 charges up to the voltage that is present on the collector of the transistor /, since the bottom 15 is connected in relation to it in the right direction.

Tpaii3i; cTOp Y has an offset equal to O, and it is open, but the voltage of the transistor 5 base is positive, since the collection is divided by resistors 8 and W, and it is closed.

This is a state, Kie will be preserved until a negative transistor 1 arrives at the base of transistor 1 or a negative impulse 5 at the base of the transistor 5. Suppose that the base of the transistor 5 applied an impulse of negative zero, then this transistor is open, and the transistor 1 is closed, because the base of the transistor / will be present at a positive voltage relative to the emitter, coming from the resistor 6, and the collector - the transistor 5 voltage is divided by the divider of resistors 7 and 9. The voltage at the collector trays / decreases. Relay 12 is turned on. The tracer voltage U is open, since the positive voltage of the charged cop-detector 3 goes to the gate of its gate. Diode 15 is now under reverse load equal to the charge voltage of the capacitor minus the pair of resistor pa // resistor // . Negative voltage is present at the base of transistor 5, and O: H is open. The capacitor 13 starts the discharge through the resistor 11 and 2, since at the source of the transistor 1 the voltage is equal to the voltage across the capacitor. As this capacitor is discharged, the flash drive / starts for; to: snaps.; 1 and the negative voltage at the base of transistor 5 starts decreasing, approaching the value of the voltage on the resistor 6, and when it goes down approximately equal to the voltage on the resistor 6 , transistor 5 starts to close, and transistor 1 opens, as its base begins to flow from (a positive voltage from collector of transistor 5. La Rinse-shaped triggering of the trigger occurs: the source 12, the winding of relay 12 is de-energized.

In the proposed relay, the shutter speed may be two or more times higher than the constant C-circuit. This is governed by resistors 7 and 8. This is due to the fact that when the transistor is closed / the voltage across the resistor // is reduced, that the constant RC circuit is identically increased, and the integration changes and increases.

In the known time relay, the RC-nsub is connected in series so that the capacitor is charged through the resistor of the master circuit time, in the proposed relay the capacitor is charged through / j and discharged through the resistor with a clock back time.

Form m} l and invented and

A relay. It contains a field-effect transistor, a serial time of a driver / C-circuit, connected by a midpoint to the control electrode of the field-effect transistor, and a capacitor to the A1IT bus, or, parallel to the resistor of which, a diode, trigger with emitter coupling to neip : BOM and second transistors with an electromagnetically controlled relay as a load, so that, in order to increase the time delay, the source of the field transistor is connected through a resistor to the collector of the first transistor, the drain is connected to the base second transistor and re The Prem Premistor Sistor C is connected to the collector of the first transistor.

Infected information sources taken during examination:

I. Patent of the GDR. L 80253, cl. 21 C 44, 03/05/71.

2. Copyright certificate

USSR Lts 597021, 11/01/77 (prototype)