SU1626371A1 - Device for controlling electromechanical switches with magnetic copes - Google Patents

Abstract

The invention relates to a pulse technique, in particular to control devices with a magnetic core switch. The purpose of the invention is to increase the reliability of operation. The control unit of the switchboard with a magnetic core contains two key elements 1 and 2, block comparison 3, control input bus 4, first and second power supply buses 5 and 9, switch winding 6.7, contact group 8, inverter 10, majority element 11, delay element 12, resistors 13 and 14. Due to the increased protection of the device to the effects of interference during the transition of the moving contact from one about stable rc, tg to another, the reliability of operation increased. 1 il.

Description

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The invention is inclined to the impulse technology, in particular, to control devices for switches with magnetic cores, and can be used, in particular, in the switching equipment of interface devices with a control computer object.

The purpose of the invention is to increase the reliability of operation.

The drawing shows a circuit diagram of the proposed device.

The device contains two key elements 1 and 2 (in the simplest case, key transistors, the bases of which are connected to the control inputs of the key elements through current-limiting resistors), comparison unit 3, control input bus 4, first bus 5. switching 6 and 7 of the switch with contact corpse 8, second power supply bus 9, inverter 10, majority element 11, delay element 12, first and second resistors 13 and 14, respectively, which are connected between the first power supply bus 5 and the corresponding opening and closing contacts contact group switch.

The device works as follows.

In the initial state of the switch, the output bus 4 of the device and the first input of the comparison unit 3 receive a signal corresponding to a logical 0 On the right, 4th input of the majority element 11, the signal corresponding to the log is received from the break contact of the switch. 1. To the input of the inverter 10 from the closing contact.a switch enters the log O. From the output of the inverter 10 log. 1 enters the second input of the majority element 11 At the time of the element 12 delay, the third one where the majority element 11 and the second input of the comparison unit 3 also contains log 1. According to the table true with and on both output ah of the comparison unit 3 there is a log. Oh, the key elements 1 are turned off, and the switch windings 6 and 7 are de-energized.

The switch-on switch signal as if 1 comes from the input name 4 to the first input of the comparison unit 3, the second one (which appears. 1) At the second output of the form comparison unit 3, the log 1 signal, which includes key element 2, appears. Through the winding 7 of the inclusion i OMG /, the device current flows, and the moving contacts of the switch, including the contact of the contact group 8, move in the direction of the closing contacts

When the movable contact is disconnected from the disconnecting to the first input of the majority element 11, a log is received. Oh, on the second and third party inputs

jnttMGHTa appears in the log. 1. Consequently, by the majority principle, the output of the major element 11 and the delay element 12 during the movement of the moving contact saves a log. 1. When a possible impact of impulse noise, as well as short-term contact of the moving and closing contacts of the comm, tpra, an alternation of the state of the log takes place at the input of the inverter 10. 1 and log. ABOUT.

5 From the output of the inverter 10 alternating log, O and log. 1 arrives at the city of the entrance of the majority element 11, the output of which also has 1 place alternation log. O and south 1. Odnchko at the output of the element 12 dorzhki saved log. 1, since the time of the delay element 12 is known to be longer than the duration of the disturbance pulses. As a consequence, the logic factors on the inputs and the block of hours 3 are compared and not changed.

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including the contact of the contact group 8, are moved towards the break contacts. When the movable contact is disconnected from the closing to the input of the inverter 10, a log is received, O. From the output of the inverter, Ylog. 1 is fed to the second input of the majority element 11, on the first and third inputs of which there is a log. A. Consequently, by the majority principle, the output of the major element 11 and the delay element 12 during the movement of the moving contact saves a log. A. With a possible impact of impulse noise, as well as short-term contact of the movable and disconnecting contacts of the switch at the first input of the majority element 11, the state log is alternated. 1 and log. A. At the output of the majority element 11, the log also alternates. 1 and log. ABOUT.

However, the output of the delay element 12 is preserved log. Oh, since the time of the delay element 12 is obviously longer than the duration of the interference pulses. As a consequence, the logical states at the inputs and outputs of the comparison unit 3 do not change, the switch-off winding 6 is not de-energized, the moving contact of the switch continues moving, and does not stop in the middle position. After the full closure of the movable and disconnecting switch of the switch at the first input of the majority of element 11, a log is set. 1. On the second input of the majority element, a log is set. 1. By the majority principle, a log is set at the output of the majority element. 1. Through the time delay log. 1 appears at the output of the delay element 12 and at the second input of the block 2 s, -, - shaking, at the first input of which i iyjf is present

log A. In accordance with the truth table, a log is set on both outputs of the comparison unit 3. A. Key element 1 is turned off, winding 6 is de-energized. The time interval during which the winding 6 is under current is enough to disconnect the switch in accordance with the requirement of the passport to the switch. Further maintenance of the switch in the off state is accomplished with the help of a magnetic core that is part of the switch.

Claims (1)

The invention The control device of an electromechanical switch with a magnetic core, containing two key elements, the first terminals of which are connected to the first power supply bus, the second leads through the corresponding windings of the electromechanical switch to the second power supply bus, to which the moving contact of the contact group, the comparison unit, the first input of which is connected to the control input bus, each of the two outputs of the comparison unit - to the control input of the corresponding key element, characterized in that, in order to increase the reliability of operation, a major element, an inverter, an element zadrzh 1 and two resistors are introduced, the first input of the major element is connected to the break contact and through the first resistor to the first power supply bus, to which the resistor is connected to the closing contact of the contact group which through the inverter is connected to the second input of the majority element, the output of which through the delay element is connected to its third input and the second input of the comparison unit.