SU1383485A1 - T flip-flop - Google Patents

Abstract

The invention relates to the field of pulsed technology and can be used in various systems of discrete automation. A trigger with a counting input contains a remote switch 1 with windings 2, 3, disconnecting, closing and switching contacts 4-6, respectively, thyristors 7, 8, resistors 9, 10, power supplies 11, 12. The trigger is reliable in operation. 1 il.

Description

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The invention relates to a pulse technique and can be used in various systems of discrete automation.

The aim of the invention is to improve the reliability of the trigger by simplifying. The drawing shows a circuit diagram of a trigger.

The trigger contains a remote switch 1 with two windings 2 and 3, opening 4, closing 5 and switching contacts b, first 7 and second 8 I thyristors, first 9 and second 10 resistors and 11 and 12 power supplies. The first j terminal of the first winding 2 of the remote j switch 1 is connected to a power source thickness 11, the second output of the first winding 2 to the anode of the first thyristor 7,: control electrodes of the first 7 and second; 8 thyristors, respectively, with an open -; 4 and the closing 5 contacts of the jOHHoro switch 1, the switching contact b of which is connected to the first terminal of the first resistor 9, the second terminal of which | is connected to the thickness 11 of the power supply, the second terminal of the first winding 2 of the remote (switch 1 is connected to the first its second winding 3, the second output of which is connected to the cathode of the first thyristor; 7 and through the second resistor 10 is connected to a common busbar 12 of the power supply, and the second thyristor 8 by its transition anode-cathode in direct connection is connected in parallel to the first o 2 decoiled remotely JHoro switch 1.

The trigger works as follows. In the absence of a pulse on the busbar 11 of the power supply, windings 2 and 3 of the remote switch 1 are de-energized, the thyristors 7

II8 are closed, contacts 4-6 of remote 1; 1 switch 1 are in the position shown in the drawing.

When the first impulse of positive polarity arrives at the busbar 11 (counting input) through the control circuit of the first thyristor 7, a current flows through the circuit: 11-resistor 9 - contacts 6 and 4 - control electrode - thyristor cathode transition 7 - resistor 10 - shell 12. The thyristor 7 opens and a current flows through the circuit through the winding 2 of the remote switch 1; 11 - winding 2 - thyristor 7 - resistor 10 - female 12. Remote switch 1 operates on winding 2 and switches contact b, while its contacts 4 and b open and contacts 5 and b close. After the contacts 5 and b are closed, a current begins to flow along the circuit: 11-resistor 9 — contacts 6 and 5 — the control electrode-cathode transition of the thyristor 8

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thyristor 7 - resistor 10 - female 12. Second thyristor 8 opens and shunts the first winding 2 of remote switch 1. At the end of the first pulse, thyristors 7 and 8 close and the position of the switching contact b of the remote switch does not change.

When a second pulse arrives on the busbar 11, the trigger works in a similar way with the difference that the second thyristor 8 first opens, the remote switch 1 is activated at the second winding 3, and its switching contact b returns to its original position. This opens the first thyristor 7 and bypasses the winding 3 of the remote switch 1.

With the arrival of odd pulses, the trigger works as with the first pulse, and with the arrival of even pulses - as with the second.

The duration of the pulse t should be chosen from the following expression Ti tsrab-on, where tsrab is the tripping time of the relay; TVL is the thyristor on time (if the thyristors 7 and 8 turn on time is different, a longer turn-on time is assumed), and to reduce power consumption, the difference (Tsrab- | - RCL) -T "MUST be minimal, then the resistor 10 can be selected to low power since it will operate in pulsed mode.

Claims (1)

Invention Formula A trigger with a counting input, containing a power supply bar, two resistors, a remote switch with two windings, the first terminal of the first winding of which is connected to the power supply, the second terminal of the first winding of the remote switch is connected to the anode of the first thyristor, the control electrode of which is connected to the break contact of the switching contact the group, the switching contact of which is connected to the first terminal of the first resistor, and the closing contact is connected to the control electrode of the second thyristor, characterized by that, in order to increase reliability, the second output of the first resistor is connected to the power supply, the second output of the first winding of the remote switch is connected to the first output of its second winding, the second output of which is connected to the cathode of the first thyristor and through the second resistor is connected to a common bus, The anode of the first thyristor is connected to the cathode of the second thyristor, the anode of which is connected to the power supply terminal.