SU437220A1 - Contactless switch - Google Patents

Description

one

The invention relates to radio engineering and can be used in automation and computer devices.

A contactless switch is known that contains a counter with a decoder, the outputs of which are connected to the trigger register inputs, the counter control circuit, the clock generator, and the AND and OR logic circuits through a match block.

This switch has low reliability and low functionality.

The purpose of the invention is to increase the reliability of the device and expand its functionality.

For this purpose, a pulse shaper was entered into it, containing a trigger with separate inputs, one input of which is connected to the counter input and the other to the output of the counting trigger, whose input is connected to the output of the I circuit, one input of which is connected to the output of the clock pulse generator and the other with the output of the additionally entered program block, contains its OR circuit group, whose inputs are connected to the outputs of the matching block, and the outputs to the inputs of the corresponding AND circuits, the other inputs of which are combined and connected to the trigger output and with separate inputs and outputs of circuits "and through the circuit" OR circuit connected to the input of "NO, the output of which is connected to the input of a counter control circuit.

FIG. 1 shows a functional diagram of the proposed switch; in fig. 2 - time diagrams. The contactless switchboard contains a counter 1 with a decoder 2, the outputs of which

through block 3, matches are associated with the inputs

trigger register 4, control circuit 5

counter 1, generator 6 clock pulses.

Shaper 7 contains trigger 8 with

separate inputs, one input of which is connected to the input of counter 1, and the other to the output of counting trigger 9, the input of which is connected to the output of the AND 10 circuit, one input of which is connected to the output of the clock generator 6, and the other to the output of the program block 11 containing a group of circuits OR 12a-12ga, the inputs of which are connected to the outputs of block 3 of the match, and the outputs to the inputs of the corresponding circuits

“And 13a. . . 3 ", the other inputs of which are combined and connected to the output of the trigger 8, and the outputs of the AND circuit via the circuit 14 are connected to the input of the circuit NOT 15, the output of which is connected to the input of the circuit 5 of the meter 1 control.

The switch works as follows.

The generator 6 sends pulses through a coincidence circuit 16 and an inverter 17 of the control circuit 5 (Figs. 2a, 26).

The switch operates in sequential polling mode register triggers 4.

Let at some time point the output signal arrives at the input 18 / g, setting to the position "1 the corresponding trigger register 4. Then, when the number" rt in the counter 1 of the switch, the output signal of the corresponding coincidence circuit of block 3 shows a single signal that using the AND block, the inverter 17, the NOT 15 circuit, and the coincidence circuit 16, blocks the arrival of pulses in the counter 1 for the time required for reliable information reading. The duration of the output pulse at the outputs 19a, 19g, 19d is determined by the driver 7 (Fig. 2e).

The first pulse of the generator 6 passes through the circuit AND 10 (Fig. 2e) to the input of the trigger 9, sets it to the position "1 (Fig. 2d), the second returns it to the position O (while the trigger 8 is transferred to the one state ( see Fig. 2d, 2d). Circuits "And 13a... 13n are blocked, the potentials at the outputs 19a, 19g, 19d disappear (Fig. 2e).

The coincidence circuit 16 is prepared for the passage of the pulse of the generator 6. The third pulse of the generator 6 returns the trigger 8 to the initial state and sets the switch 1 of the switch to the next position (Fig. 2a, 26, 2e).

FIG. 2 shows three cases of the arrival of a signal from the sensor of primary information:

A - the signal comes at the moment when the counter 1 is in the position corresponding to the given sensor of the primary information, and the generator 6 generates a single signal;

B - differs from the previous case in that generator 6 outputs a zero signal;

B - the signal from the primary information sensor comes at the moment when the counter 1 reads the unit of the previous sensor.

As can be seen from the diagram (Fig. 2e), the minimum time of the output signal (output 19d) is equal to the oscillation period of generator 6 (the case when the signal from the primary sensor

the information arrives at the input of register 4 at the time the generator 6 signal changes from unit to zero, and the minimum pause time between the output signals is half period, case B).

The number of output sensors that can be connected to the device is determined by the time of production and the speed of the output recorders. For this, it is necessary that the polling time of register 4 triggers is less than the technical cycle of manufacturing products.

Subject invention

A contactless switch comprising a counter with a decimator whose outputs through a matching unit are connected to the trigger register inputs, a counter control circuit, a clock generator and logic circuits AND, OR, NOT, in order to increase the reliability of the device and extending its functionality, a pulse driver has been added that contains a trigger

with separate inputs, one input of which is connected to the counter input, and the other to the output of the counting trigger, whose input is connected to the output of the AND circuit, one input of which is connected to the output of the clock generator, and the other to the output of the additionally entered program block containing a group of OR circuits whose inputs are connected to the outputs of a matching block, and the outputs to the inputs of the corresponding AND circuits, the other inputs of which are combined and connected to the trigger output with separate inputs, and the outputs of the AND circuits OR connected S to the input of the circuit "NOT, the output of which is connected to the input of the circuit of control of the meter.

18p

18a

a-tl

d

W

V.