SU767856A1 - Time relay - Google Patents

Description

one

The invention relates to electric automation devices, in particular, to time relays, which provide the required delay in releasing the core after disconnecting from the power source. Such relays, after a given time delay, are transferred to passive: noe. state (de-energization of the operating voltage, loss of the relay's core, termination of the signal at the device output). Known time relay containing

, a start key, a resistor, a rule, a driving capacitor, an electromagnetic relay. This is a time relay providing.

, deceleration release of the relay box after disconnection from the power supply l.

However, to obtain slowdowns

From the secude and more, the capacitance of the deceleration capacitor should be hundreds and thousands of microfarads. Technically, it is advisable to use only electrolytic capacitors and highly sensitive relays at acceptable sizes and weights at the indicated deceleration values. .

The time relay with electrolytic capacitors is not reliable enough and accurate, due to the shortcomings of these capacitors: a relatively large parameter of the flow of failures, a limited service life (rapid aging), a significant variation in the initial capacitance values (1.5 times relative to the nominal value ), significant temperature instability

to within the operating temperature range (at -40 ° C, the capacitance decreases by a factor of 2).

A time relay is known; a capacitor connected through a Kjra4 start-up between the poles of the power supply, a manipulator with two keys synchronized in antiphase with serially connected outputs, one time connected to a common point of the start key and the time setting capacitor, the other output stage sambozblokirovki key - to

25 to the pole of the power source, the common point of exit of the keys of the manipulator is connected to the input of the output stage 2.

The disadvantage of this time relay is that it does not provide sufficient reliability of the device operation. When the manipulator is stopped (breakdown, breakage, jamming) in the position when its key is closed, connected to the power source through the output stage lock key 1, the output stage will continue to receive power from the idle capacitor. The purpose of the invention is to increase the reliability of the time relay, the goal is achieved by the fact that in the time relay, which contains the time setting capacitor connected via a start key between the poles of the power source, a manipulator with two keys synchronized in antiphase with series-connected outputs one of which is connected to common start point and initiator time, and output stage C) trigger and square capacitor, one of which is connected to the common exit point key minutes manipulator, the other plate - to the first input terminal of the flip-flop output ,, second input of which is connected to the common junction pole of a power source and output a second key of the manipulator, a trigger output connected to the input of the output stage. The drawing shows a schematic diagram of the proposed device. The time relay contains the time setting capacitor If, quantizing capacitor 2, manipulator 3, made in the form of two keys on transistors and 5, transformer 6 and alternator, trigger 8, output stage 9, made in the form of transformer 10, valve 11 and an elec- tromagnetic relay 12, the key 13 start. The secondary windings of the transformer 6 of the manipulator 3 are connected to the base circuits of the transistors 4 and 5 in such a way that the phases of the voltages on the bases differ by 180 °. In the initial state, the start key 13 is closed, the capacitor 1 is charged before the voltage of the power source. Under the action of the alternating current of the generator 7, the transistors 4 and. Step 5 of the night dyo opens and closes. When a half-wave current is received from the generator 7 of that pH when the transistor 4 is opened and the transistor 5 is closed, by the voltage of the Litani, the charge: the quantum capacitor 2 is pressed, and the charging impulse transfers the trigger B to one of the stable states. With the other on the 19th W Schroegneggng current, when the transistor 4 is closed and the transistor 5 is open, the quantizing capacitor 2 is discharged, and the discharge pulse transfers the trigger 8 to another steady state. The trigger 8 operates continuously with the generator frequency 7. The alternating current of the trigger output 8 is supplied to the primary winding of the transformer 10. With the secondary winding of the transformer 10 after being detected by the rectifier 11, the control current is fed to the relay winding 12. Thus, when the start key 13 is closed, Electromagnetic relay 12 is flown around and the relay is in a pulled position. When the start key 13 is opened, the time specifying the capacitor 1 starts to discharge, and from that moment on the device’s time delay begins. In this case, the trigger 8 continues to operate at the expense of the charge energy of capacitor 1. Capacitor 1 is partially discharged to capacitor 2 through the input of trigger 8 when a half current of the polarity opens from generator 7, which is opened by transistor 4. Thanks to the quantizing capacitance capacitor 2 is much less than the capacitance of capacitor 1, capacitor 1 is discharged in small portions for a long time, and all this time relay 12 remains energized. When the voltage on the capacitor 1 is reduced to the trigger threshold of trigger 8 ,. relay 12 is de-energized. Fixing the end of the time delay of the DEVICE. The introduction of a quantizing capacitor and a trigger connected to the keys of a manipulator allows the static charge to convert the time of the master capacitor into an alternating current, the presence of which at the output of the trigger is a sign continuous monitoring of the absence of breaks and closures of all elements of the circuit. Due to the presence of a quantizing capacitor, the charge time of the master capacitor is economically expended, which allows a significant deceleration time to be achieved with a small capacitor capacitance. The contactless execution of the manipulator ensures a long service life of the device. The transformer at the input of the keys of the manipulator is galvanically and by the voltage level it discharges the time capacitor with the power source of the alternator, which excludes the possibility of additional additional charge for the time of the driving capacitor. The proposed device allows to increase the reliability of the time relay.

Claims (2)

1. A time relay containing a time specifying a capacitor connected through start keys between the poles of a power source, a manipulator with two synchronizing switches 1 and in antiphase with keys with sequential & single connected inputs, one of which is connected to the common point of the start key and the time of the master capacitor, and an output stage, characterized in that, in order to improve the reliability of operation, a trigger and a quantum capacitor are additionally introduced , one plate of which is connected to the common point of exit of keys of the manipulator, the other plate to the first input terminal of the trigger, the second input terminal of which is connected to the common point of connection of the source pole and the output of the second key manipulator, the trigger output is connected to the input of the output stage, 2. The time relay according to claim. 1, characterized in that The nipulator is designed as an alternator, transformers of two transistors, the base of one of them is connected to the beginning of one, and the base of the second is connected to the end of the other secondary winding of the transformer, the primary 5, the transformer winding is connected to the output of the alternator, the outputs of the manipulator are emitter-collector transitions of transistors. 3, a relay according to claim 1, characterized in that the output stage is in the form of a transformer, a valve and an electromagnetic relay, the latter are connected in series 5 the secondary winding of the transformer, the primary winding of which is connected to the trigger output. Sources of information taken into account in the examination { 1. Theoretical foundations of automation and remote control, Moscow, Transzheldorizdat, 1961, p. 81, Fig.39.1. 2. USSR author's certificate No. 505077, class, H 01 H 47/18, .28.04.76. five