SU1225007A2 - Contactless switch - Google Patents

Abstract

The invention can be used in automatic monitoring and control systems and contributes to increasing reliability of operation by eliminating the appearance of false information at its output. The device contains 6jfoK 1 set to the initial state, including the element OR-NOT 2, the capacitor 3 ,. resistor 4, diode 5, element NOT 6, triggers 7, 8 and 9, elements AND 10 and 11, input 12 and 13, and output 14 and 15 tires, differentiating blocks 16 and 17, element OR 18, and common bus 19. In the description shows time diagrams for the operation of the switch. Invention additional to auth. St. No. 1115227. 2 Il. (L with to 1C ate

Description

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11225007

The invention relates to a pulse technique and can be used in automatic control systems and is an improvement to the author. St. No. 1115227.

The purpose of the invention is to increase the reliability of work by eliminating the appearance of false information at its output.

FIG. 1 is a functional diagram of the switch; in fig. 2 is a timing diagram explaining its principle of operation in one cycle of operation.

The contactless switch contains a block 1 of the installation in the original connection, which includes an element OR-NOT 2, a capacitor 3, a resistor 4, a diode 5,. element NOT 6, as well as triggers 7-9, elements AND 10. and 11, first and second input buses 12 and 13, first and second output tires 14 and 15, differentiating units 16 and 17, element OR 8, common bus 19.

The output of the element OR NOT 2 is connected through a capacitor 3 to the first output of the resistor 4, the cathode of diode 5 and the input of the element NOT 6, the output of the circuit, which is the output of the initial state unit 1, is connected to the installation inputs of the first and second trigger 7 and 8 and the counting trigger 9, the first outputs of the triggers 7 and 8 are connected respectively to the inputs of the elements 10 and 11, the other inputs of which are connected to the corresponding input buses 12 and 13, and the outputs to the corresponding outputs of the output buses 14 and 15, with the first inputs first and second triggers 7 and 8 connected to the first and second input buses 12 and 13, respectively, the second inputs to the second outputs of the second and first triggers 8 and 7, respectively,

the anode of the diode 5 is connected to the common bus 19.

The contactless switch operates as follows.

When the power supply voltage of unit 1 is turned on, a short negative voltage pulse I. generates its output at its output, which sets triggers 7–9 to their initial state, while at the first (forward) outputs of triggers 7 and 8, and The output of the counting flip-flop 9 is set accordingly to the voltages I, I (d, Ie with a logic level of 15). and 15 are set according to the voltage AND and and And also with Zfovne logical O.

Positive input voltage pulses are applied to input buses 12 and 13, and the second pulse is delayed relative to the first by a time longer than the first pulse. The first impulse in time goes to the first (synchronous) input of the corresponding trigger 7 (8), and reverses it. At the direct output of this trigger 7 (8) and the output of the connected to the logical element AND 10 (11), the voltages are respectively set. And (HIO) and and „(And, 2) with a logical level of 1.

On the leading edge of the first input pulse HI (R), trigger 8 (7) is blocked by the second input (D input) - element 11 (10) by a voltage corresponding to the logic level O, resulting in a corresponding output bus 14 (15) only the first input voltage pulse, And, (Vg) is allocated, and the second

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thirty

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the inputs of the first and second differentiation, the input pulse I (I) to the output of the hitting blocks 16 and 17, are connected to the corresponding input buses 12 and 13, the outputs to the corresponding inputs of the element. OR 18, the output of which is connected to the input of the counting trigger 9, the output of which is connected to the third input of the OR-NOT 2 element, which is the third input of the initial setting unit 1, the first and second inputs of the OR-NOT element, which are the first and second input unit 1, are connected respectively to the tires 12 and 13, and the second output of the resistor 4 and

0

the anode of the diode 5 is connected to the common bus 19.

Contactless switch operates as follows.

When the power supply voltage of unit 1 is turned on, a short negative voltage pulse I. generates its output at its output, which sets triggers 7–9 to their initial state, while at the first (forward) outputs of triggers 7 and 8, and the output of the counting trigger 9 is set, respectively, the voltage And, And (d, Ie with the level of logical O. In the initial state, the input buses 12 and 13 are supplied with the voltage And and I2 corresponding to the level of the logic O while on the output tires 14, .and 15 are set accordingly to the voltage AND and and And also with Zfovne logical O.

The input buses 12 and 13 receive positive pulses of voltages I, and the second pulse is delayed relative to the first by a time longer than the duration of the first pulse. The first time pulse arrives at the first (synchronous) input of the corresponding trigger 7 (8), knocking it over. At the direct output of this trigger 7 (8) and the output of the connected to the logical element AND 10 (11), the voltages are respectively set. And (HIO) and and „(And, 2) with a logical level of 1.

On the leading edge of the first input pulse HI (R), the trigger 8 (7) is blocked by the second input (D input) - And 11 (10) element with a voltage corresponding to the logic level O, resulting in a corresponding output bus 14 ( 15) Only the first input is provided. pulse voltage And, (IG), and the second

five

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45 input pulse AND (And) output ne

switch does not pass.

Thus, the priority for passing to the corresponding output of the switch receives an input pulse H (Hj) 50 times in time, and the second impulse I delayed relative to it (this is blocked and the corresponding output does not pass.

According to the decay of the second pulse in time, the unit 1 of the installation into the initial state forms a negative pulse I., which sets the switch to the initial state.

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When the next pair of pulses arrives at the input buses 12, 13, the work cycle is repeated.

The operation of the switch when two impulses arrive at its input buses 12 and 13, the second of which is delayed relative to the first ria, is less than the duration of the first impulse, is similar.

Elimination of the appearance at the corresponding output of the switch of the second false pulse in the case of two impulses arriving at the input buses 12 and 13 And | and And, the second of which is delayed by a time longer than the duration of the first pulse, is carried out as follows.

On the leading fronts of the input pulses AND 4 and Hj, the first and second differentiating units 16 and 17 form, respectively, short positive voltage pulses AND and I, which from the outputs of the differentiating units 16 and 17 are fed to the inputs of the element OR 18. The first of two output pulses And the element OR 18, arriving at the input of the counting trigger 9, overturns, and the second drops it, as a result of which, at the output of the trigger 9, a positive voltage pulse AND is formed, the duration of which is equal to the delay time of the second pulse I5, (And,) from about the first id).

At the output of an OR-NOT 2 element, a positive impulse is generated AND a duration equal to the sum of the duration of its impulses And and And and the time of rupture between them, which ensures that the unit 1 forms the setting of the initial state of the pulse AND only . by the decay of the second time input pulse). turn, provides a ban on the passage to the output of the second pulse), delayed relative to the first at a time, greater than the duration of the first pulse IDN).

Claims (1)

Invention Formula Contactless switch for 20 aut. St. No. 1115227, different from and with. so that, in order to increase the reliability of work by eliminating the appearance of false information at its output, element 25 OR, two differentiating blocks, a counting trigger, whose output is connected to the third input of the IL-NOT element, and the input input - to the output the NOT element, the inputs of the differentiating units are connected to the first and second input buses, respectively, the first and second inputs of the OR element are connected to the output; the first and second differentiating units, respectively, and the output to the input of the counting trigger. 2 Compiled by O. Andronov Editor I. Segl nik Tehred O. Sopke, Proofreader M. Demchik Order 1964/58 Circulation 816 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4