SU1554133A1 - Electronic switch - Google Patents

Abstract

The invention relates to a pulse technique and can be used in instrument making. The aim of the invention is to increase the speed of reliability. The electronic switch contains a mechanical non-locking switch 1, the input of which is connected to the power supply bus 2, a pulse generator 3 and a display unit 4, the first 8, the second 9 and the third 11 delay blocks, elements 10 and EXCLUSIVE OR 6, trigger 7 and ring counter 5 The increase in speed is achieved due to the fact that the first switch after pressing switch 1 takes place immediately, and not by the impulse of generator 3, and the increase in reliability due to independence from the parameters of the power source.

Description

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The invention relates to a pulsed equipment and can be used in the construction industry.

 The purpose of the invention is to increase switching speed and reliability.

The drawing shows the structure of the proposed electronic switch.

The switch contains a mechanical non-latching switch 1, inu 2 power supply, generator 3 pulsol, display unit 4, ring counter 5, EXCLUSIVE OR 6 element, trigger 7, first delay block 8, second delay block 9, element 10, third delay block 11 . The input of the mechanical switch 1 is connected to the bus 2 of the power source, the inputs of the display unit 4 are connected to the output bus 12 and the outputs of the ring counter 5 whose input is connected to the output of the EXCLUSIVE element OR 6, the R input to the output of the trigger 7, the R input of the last through the first delay unit 8 is connected to the output of the second delay unit 9 and the input of the generator 3 pulses, S-input –c output of the generator 3 pulses and the first input of the element 10. The second input of the latter is connected to the output of the third delay unit 11, output - with the first input of the IC element KEY OR 6. The second input of the latter is connected to the input of the third delay block 11 and the output of the mechanical switch 1 f whose input is connected to the input of the second delay block 9.

The delay units perform a time delay of the edges of the pulse signals (voltage drops). In the simplest case, they can be made in the form of an integrating RC-chain with a series connection of logic elements to obtain steep edges with a diode connected in parallel with the resistor of the integrating chain to eliminate the cut-off signal delay.

The electronic switch operates as follows.

In the initial state, the mechanical non-locking switch 1 is open. At the moment the power source is turned on, the voltage drop occurring on bus 2 is delayed in the second delay unit 9 by time t until the power supply voltage reaches 1

one

0

five

0

five

0

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45

50

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This is not a fixed value. Therefore, at the time before the voltage source (bus 2) reaches a steady-state value, the inputs and outputs of the generator 3 pulses and the first delay unit 8, as well as the inputs of the trigger 7, are set to logic 0, and the generator 3 pulses are in a decelerated state. Through the time determined by the delay unit 9, the logical 1 from the bus 2 arrives at the inputs of the pulse generator 3 and the first delay unit 8. The pulse generator 3 goes into an auto-oscillatory mode and at the first moment I appears at its output, the x-torus arrives at the first input of the element AND 0 and the S input of the trigger 7, When the switch 1 is pressed, the second input of the element 10 is set to O which prevents the passage of pulses from the generator 3 to the C input of the counter 5. Logical 1 at the S input of the trigger 7 provides O at its output, which resets and keeps the ring counter 5 in the initial state Through the time determined by the first block 8 of the delay , on the R-input of the trigger 7 post drops 1, which does not change the state of the trigger, and ring counter 5 is kept in the initial state. The occurrence of O at the output of the generator 3 pulses, and accordingly at the S input of trigger 7, leads to appearing 1 at its output and at the R input of counter 5, which permits its operation.

When the mechanical switch 1 is pressed, the positive voltage drop from its output goes to the second input of the EXCLUSIVE OR 6 element and through it to the first input of the ring counter 5, At the moment the key is pressed, the counter changes its state. In order to prevent the C-input of the voltage difference meter 5 from the mechanical switch 1 or pulses from the generator 3 from being simultaneously or almost simultaneously coming from the generator 3, a delay unit 11 serves. After a time determined by block 11, the second input of the element 10 is set to 1, which permits the passage through it and the element EXCLUSIVE OR 6 to the C input of the counter 5 pulses from the generator 3. The ring counter synchronously with the pulse frequency changes

515541

your condition. When the key of switch 1 is lowered, a logical O from its output without delay in block 11 enters the second input of element 10 I, which prevents the passage of pulses from generator 3 to the C input of counter 5 and records its state.

Claims (1)

An electronic switch comprising a mechanical non-locking switch, the input of which is connected to a power supply bus, a pulse generator and a display unit whose input is connected to an output bus and an output of a ring counter, characterized in that, in order to increase switching speed and reliability, into it introduced olo , 33 cops AND AND EXCLUSIVE OR, first, the second and third delay blocks and the trigger, the output of which is connected to the R input of the ring counter, the C input of which is connected to the output of the EXCLUSIVE OR element, the R input of the trigger through the first delay block connected to. the output of the second delay unit and the input of the pulse generator, the S input of the trigger is connected to the output of the pulse generator and the first input of the AND element, the second input of which is connected with the output of the third delay block, the output of the AND element connected to the first input of the EXCLUSIVE OR element, the second input of which is connected to the input of the third delay unit and the output of the mechanical switch, the input of which is connected to. the input of the second delay unit.