SU1007196A1 - Sensory switch - Google Patents

Abstract

A TOUCH SWITCH, a t-contact pad, each of KOTOfftix is connected via the first resistor to the power bus and to the input of the corresponding bidirectional input key, the first output of which is connected to the common bus, and through the second resistor is connected to the power bus and to the first input of the corresponding element AND -NON, the second input of which is connected to the first output of the corresponding 0-triggers, and the output of the element AND-NOT is connected to the information input of the D-flip-flop, the second input of which is connected to the corresponding output bus, which differs from the fact that, in order to increase reliability of operation, an additional AND-NOT element and a multivibrator are introduced into it, and the outputs of the IS-NOT elements are connected to the corresponding inputs of the additional AND-NOT element, the output of which is connected through the multivibrator to the synchronization inputs of all g 0-flip-flops.

Description

The invention relates to .electronic and impulse technology, in particular, to contactless switch devices, operated by operator touch, made on integrated logic chips, and intended for use in information input devices, switching devices and automation systems.

Known touch switch containing pads, elements And and O-triggers i.

The disadvantage of this device is the possibility of false positives.

Closest to the invention in its technical essence is a sensory, switching device comprising pads, input keys; NAND and D-flip-flop elements 2.

A disadvantage of the known device is the low reliability of operation, due to the complexity of the design and the possibility of false positives.

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

The goal is achieved in that a sensor switch containing contact pads, each of which is connected via the first resistor to the power bus and to the input of the corresponding bidirectional input key, the first output of which is connected to the common bus, and the second through the second resistor is connected to the power bus and with the first input of the corresponding element, the second input of which is connected to the first output of the corresponding O-flip-flop, and the output of the element NAND is connected to the information input of the D-flip-flop, the second output of which By connecting the respective output line, introduced an additional NAND i.multivibrator, wherein elements AND-NOT outputs connected to respective inputs of an additional element AND-NO element whose output is connected to the multivibrator via

synchronization inputs of all O-triggers.

The drawing shows the electrical principle of the touch switch circuit. The touch switch contains pads 1, bidirectional input keys 2, elements AND-NOT 3, resistors 4 and 5, fixed

0-triggers 6, element AND-NOT 7, multivibrator 8, power bus 9 and output buses (outputs) 10.

Touch switch works as follows.

npjj power on bus 9

Multivibrator 8 switches 0-trngers b to position 1. Driving contact pad 1 through skin resistance (skin resistance Much less resistance from the bias resistor 4) to the input of the bidirectional switch 2 of the first channel is given a low potential (O). The key 2 is closed and a high potentious (1) is set at the input of the element AND-HE 3. A low potential (O) is established at the output of this element. Through the element AND-NOT 7, the multivibrator 8 is launched. Formed by the multivibrator 8

a pulse of fixed duration arrives at the synchronization inputs of the 0-flip-flops 6. The 0-flip-flop 6 of the first channel is set to O, the remaining D-flip-flops 6 remain in position. The low potential at the direct output of the D-flip-flop 6 of the first channel prohibits the passage of signals through the NAND 7 element.

Similarly, the other channels of the switch work.

Thus, the introduction of a write pulse formation circuit consisting of an AND-NE element 7 connected to the multivibrator 8 to the sensor switch significantly increases the reliability of the switch, eliminating the possibility of false positives, since the write pulse is generated only at the moment the pad touches.

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Claims (1)

TOUCH SWITCH, (containing pads, each of which is connected through the first resistor to the power bus and to the input of the corresponding bidirectional input key, the first output of which is connected to the common bus, and the second through the second resistor is connected to the power bus and with the first input of the corresponding AND-NOT element, the second input of which is connected to the first output of the corresponding D-trigger, and the output of the AND-NOT element is connected to the information input of the D-trigger, the second input of which is connected to the corresponding output not distinguishing by the fact that, in order to increase reliability, it introduced an additional AND-NO element and a multivibrator, the outputs of AND-NO elements are connected to respective inputs of an additional AND-NO element whose output is through sub multivibrator _(keys to synchronization inputs all 1 D-flip-flops. > and. „, 1007196>