SU907788A1 - Single pulse generator - Google Patents

Description

(54) GENERATOR OF SINGLE IMGOLS

one

The invention relates to a pulse engineering technique and can be used for forming time intervals and issuing command pulses.

A single pulse generator is known for generating pulses from a mechanical switch, comprising resistors, a capacitor, and logic elements P.

However, this generator is not reliable enough and can generate a single pulse only when the switch is closed.

The closest to the proposed technical entity is a single pulse generator, containing a switch, RS - a trigger, two Y-NOT elements and a trigger with a counting input connected between the output of the first AND-NES element and the first input of the second AND-NEA element, the output of which is connected to the first input of the first NAND element, and the second input is connected with a moving contact of the switch, the fixed contacts of which are connected to the inputs of the RS flip-flop f2J.

A disadvantage of the known single pulse generator is that it can only generate a single pulse when the mechanical switch is released.

The purpose of the invention is to expand the scope.

The goal is achieved by the fact that a single pulse generator, containing a switch, LZtggrigger, two NAND elements and a trigger with the same input, is connected between the output of the first NAND element and the first input of the second NAND element, the output of which is connected to the first input the first element is NAND, and the second input is with a moving contact of the switch, the fixed contacts of which are connected to the inputs of the RS flip-flop, a D-trigger and element 2I-OR, the output of which is connected to the second input of the first element NAND, the first inputs are entered to exits RS flip-flop, and the second inputs to the D-flip-flop outputs, the D-flip-flop input, are connected to the RS-flip-flop forward output, and the sync input is with the moving contact of the switch. The drawing shows the functional scheme of the generator of single pulses. The single pulse generator contains a switch 1, RS-trigger 2, the first element AND-NOT 3, trigger A with a counting input, the second element AND-NOT 5, D-trigger 6 and element 2I-IPI 7. The generator of single pulses works as follows in a way. In the initial position, the switch l 1 when switching on the power supply and supplying the bus 8 with the pulse sequence, and on the buses 9 and 10 - logic 1 on the direct outputs of the RS flip-flop 2 and D-flip-flop 6 a logical H is set, and on the output of the flip-flop 4 logical A. When the switch 1 is triggered, the nearest voltage drop from logical 1 to logical O in a pulse sequence on bus 8 tilts RS-trigger 2 to the opposite state. A positive feedback from the inverse output of the RS trigger 2 through the element 2 AND-OR 7 and the first element AND-NOT 3 affects the counting input of the trigger 4, switching it to the opposite state. The potential of logic 1, having evolved at the output of trigger 4, allows the formation of a negative pulse at the output of the second AND-NOT element. 5 At the end of the output impulse, its positive front is inverted by the first AND-NOT element 3 and acts on the trigger input 4, switching it to its original state, thereby stopping the passage of other pulses to the output. At the same time, the negative edge of the pulse sequence affects the synchronization input of D-flip-flop 6, switching it to the opposite state, since the potential of logical O from the direct output of RS-flip-flop 2 acts on the control input of D-flip-flop 6. the negative front of the pulse sequence overturns the RS-trigger 2 to its initial state. The positive edge from the direct output of the RS trigger 2 through the elements AND-OR 7 and AND-NOT affects the counting input of the trigger 4, switching it to the opposite state. The potential of logic 1, which appeared at the output of trigger 4, allows the formation of a negative pulse at the output of the second AND-NOT element 5. At the end of the output pulse, its positive front is inverted by the first AND-NOT element 3 and affects the counting input of the trigger 4, switching it to the initial one state and prohibit the passage of other pulses to the output At the same time, the negative edge of the pulse sequence acts on the synchronization input of D-flip-flop 6, switching it to its original state, since the potential 1 logic output acts from the direct output of the RS-flip-flop 2. At the same time, a single impulse formation cycle when triggered and released switch 1 is terminated, and the generator is ready to form the next pulses. When 9 and 10 are applied to the buses, respectively, the potentials of the logical G and O, the D-flip-flop 6 remains in the initial state regardless of the signals at its control input, ensuring the formation of a single pulse only when the switch is triggered. When applied to busses 9 and 10, respectively, the potentials of logic O and 1, D-flip-flop 6 is in the opposite state, regardless of the signals at its control input, ensuring the formation of a single pulse only when the switch is released. The introduction of D-flip-flop 6, element 2I-OR 7 and the connection of these elements with the rest of the generator elements in accordance with the foregoing expands the field of application of the known generator, ensuring the formation of single pulses at different positions of the switch 1. Lormula Invention A single pulse generator containing a switch, an RS trigger, two NAND elements and a trigger with a counting input connected between the output of the first AND NAND element and the first input of the second NAND element, the output of which is connected to the first input of the first element AND-NOT, and the second input with a moving contact of the switch, the fixed contacts of which are connected to the inputs RS - a trigger, characterized in that, in order to expand the field of application; D-flip-flop and element 2I-OR, the output of which is connected to the second input of the first NAND element, the first inputs to the outputs of the PS-trigger, and the second inputs to the outputs of the D-flip-flop, the control input of the flip-flop is connected to direct output RS-flip-flop, and the synchronization input - with a movable contact switch, ate. Sources of information taken into account in the examination 1. devices and equipment of the experiment. M., 1973, 4, p. 18, fig. 36. 2. USSR author's certificate No. 526063, cl. H 03 K 3/84, 1975 (prototype),

Claims (1)

Claim A single pulse generator containing a switch, an RS-trigger, two AND-NOT elements and a trigger with a counting input, connected between output 5 of the first AND-NOT element and the first input of the second AND-NOT element, the output of which is connected to the first input of the first AND element NOT, but the second input with a movable contact of the switch, whose stationary contacts are connected to the inputs of the RS - trigger, characterized in that, in order to expand the scope of application, a D-trigger and an element '5 2I-OR, the output of which is connected to the second input of the first element And NOT, the first inputs are to the outputs of the P.S-trigger, and the second inputs are to the outputs of the D-trigger, the control input of the ’-trigger is connected to the direct output of the RS-trigger, and the synchronization input is connected to the moving contact of the switch.