SU439065A1 - TIME RELAY - Google Patents

Description

one

The invention relates to the field of automation and can be used in automatic control systems and control to form long shutter times.

Known time relay with an electrochemical time setting element containing the current-carrying resistance, transistor switches, trigger-p and logic circuit. This time relay allows IB to start long periods of ori of high stability and small dimensions of the device.

A disadvantage of the known relays is that during lithium supply interruptions, the time delay can take any value from maximum values to zero, which leads to a significant increase in the relay error.

The purpose of the invention is to reduce the heat resistance (the power of a chemotropic time relay during its operation with interruptions in the supply voltage.

This goal is achieved by the fact that the separate inputs of a tr1igger are connected to the outputs of the OR circuits, the inputs of which are connected respectively to the Electromyge electrochemical time of the driver element and to the outputs of two coincidence circuits, one of the inputs connected to the input source, and one of the match directly, and the other through an inverter, the other inputs of the coincidence circuits are connected to the output of the waiting multivibrator, whose input is connected to the voltage formulator

power, performed, for example, dynistor. And with the spurious signal elimination slot at the output of the relay when the supply voltage recovers, the output of the power supply shaper is connected via an integrating circuit and Schmitt trigger to the inhibitor circuit included in the output circuit, the time relay.

A functional diagram of the chemo tron time relay is shown in the drawing.

Time relay 1 consists of the following elements: electrochemical time, driver element 2 with electrodes 3, 4, current generating resistors 5, 6, key transistors 7, 8, trigger 9, circuits OR 10, 11, coincidence circuit 12 "inverter 13.

In addition, the time relay contains two lo-. OR schemes 14, 15, connected between the elastodes of the electrochemical cell 2 and the inputs of the trigger 9; match schemes 16, 17; prohibition 18; waiting multivibrator 19; a voltage driver power supply 20, performed on a dynistor 21 and a resistor 22; integrating RC circuit from resistor 23 and co-selector 24 and trigger

Schmitt 25.

Recovery of the time relay status after power interruptions occurs as follows. In the INITIAL state of the relay, the input signal is zero, trigger 9 is in position shown in the drawing, both key switches open and charge in electrochemical cell 2 is completely set aside at electrode 4. If the power voltage fails at this stage, then restoring it at some point in time in shaper 20, dynistor 21 is turned on and starts standby multiplier 19, the imiulse of which is run through a coincidence circuit 17, prepared by a single value of the signal from inverter 13, to the right in od trigger 9 and sets it into a state opposite starting. As a result, the key transistor 7 is closed and the electrochemical cell 2 switches to the charge inepeHoc from electrode 3 to electrode 4. But since the charge in the electrochemical cell before the power failure was completely rejected on the electrode 4, then after a time determined by the constant In this case, the charge time of the Cell Capacity of the electrochemical cell and the amount of charge dissolved in its electrolyte, the voltage on electrode 3 will increase dramatically and return trigger 9 to a similar state.

After stopping the time relay, which occurs when the input signal changes from zero to one, the key transistor 8 closes and in the electrochemical cell, under the action of the current flowing through the resistor 6, the charge transfer from the electrode 4 to the electrode 3 begins. the operation of the relay — the stages of forming the time delay — trigger 9 continues to be in the initial state, which is maintained until the entire charge in the electrochemical cell passes to electrode 3, after which the trigger trips Hera 9 to another position. Obviously, if during the formation of the shutter speed as a result of dips and subsequent restoration of the supply voltage, the trigger 9 is set to the opposite state of the original, then this will be equivalent to the end of the time delay process, although the charge of the electrode 4 electrically: the MI element will not yet reach zero . In the proposed time relay, such failures do not occur, because when the supply voltage is restored, the trigger 9 is forcibly reset to the initial state by a pulse of the waiting multivibrator, passing through the coincidence circuit 16 prepared by a single value of the input signal and the return circuit of the RSH14 to the left trigger input 9.

In a similar way, the time relay is restored after interruptions: charging: power supply while being) barely working, working and in the isstanding stage, when charge transfer from electrode 3 to electrode 4 occurs in an electric element (preparation of the relay to restart). When the time relay is in the initial state, at its output, at interruptions in the voltage of the thread, false signals appear, the duration of which, as indicated above, is determined by the parameters of the electrochemical element; and it can be quite significant (up to a few seconds). The presence of such spurious signals at the relay output in a number of automatic control systems is inadmissible. In connection with this

circuits are introduced into the proposed device that eliminate such false signals. When power is restored, the voltage from the output of shaper 20 is fed to the integrating circuit and the capacitor 24 starts charging. While the voltage on the capacitor does not reach the trigger threshold W 25, the output signal of the latter is zero and using the inhibit circuit 18 blocks the passage of the false

signal "time relay output. With an appropriate choice of the constant charge time of the capacitor 24, the Schmitt trigger is triggered after the termination of the false signal, as a result of which the latter does not

passes to the output of the time relay.

Values that include a voltage shaper, one multivibrator waiting, an integrating RC circuit and a Schmitt trigger can be common to many relays

of time. This simplifies the construction of a chymotronic time-resistant power supply in case of multichannel execution.

Subject invention

Timer on aut. St. No. 381159, characterized in that, from the standpoint of reducing the time delay error during power supply interruptions, separate trigger inputs are connected to the OR circuit outputs, whose inputs are connected respectively to the electrochemical time of the master element and to the outputs of two coincidence circuits, one input which are connected to the 1K control signal source, and in one of the coincidence circuits directly, and in the other through the inverter, the other inputs

Matching circuits are connected to the output of a standby multivibrator, the input of which is connected to the form; to the globalizer of the supply voltage, made, for example, on a dynistor.

2. Relay on n. 1, that is, because

in order to eliminate spurious signals at the output of the relay when the supply voltage recovers, the output of the voltage regulator is connected via an integrating RC circuit and Schmidt trigger to the inhibitor circuit included: In the output value of the monn.