SU1225003A1 - Multichannel single pulse transducer - Google Patents

Abstract

The invention relates to automation and computing and can be used in control devices. The purpose of the invention. - Reliable reliability. The device contains a group of resistors 1 and 2, the elements are NOT 3 and 6, the trigger-. a ger 4, an adjustable delay device 5, an element of NAND 7. with an open collector and a group of buttons 8. The introduction of an element NOT 6, N + 1 resistors, an element of NAND with an open collector made it possible to simplify the device. The description presents diagrams of the device operation. 2 Il. Fi9.1 (L

Description

The device relates to automation and computing technology and can be used in monitoring and control devices.

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

Phi1, 1 shows the electrical circuit of the device; in fig. 2 - diagrams of his work.

The multichannel sensor of single pulses contains i-pyriny resistors 1 (R,), resistor 2 (p2) element HE 3, trigger 4, adjustable delay device 5, element HE 6, element AND NOT 7 with an open collector, a group of buttons 8.

Each resistor 1 is connected between the positive power source and the corresponding output of the device, which through the closing contacts of the corresponding buttons 8 are connected to the output of the NAND 7 element. The input of the second element NO 3 is connected to the output of the element OR NONE 7, the output is unit input trip 4, trip 4 output 4 is connected to the input of the delay device 5. The input of the first element is NOT 6 connected to the first output of the device of the delay 5. The inputs of the element AND-NOT 7 are connected to the second, the output of the device of the delay 5 and the output of the element 6, zero input trigger It is connected to the output of the element 6. A resistor 2 is connected between the input of the element 3 and the common bus. Multichannel sensor single pulse works as follows

In the initial state, trigger 4 is on, and at the input of delay device 5 and its outputs, logical O. Under these conditions, the AND-HE element 7 is closed. Since all buttons 8 are in the open state, there is no load resistance in the collector circuit of element 7, which can be one of the resistors 1 connected to this element by the corresponding button.

For an NAND element 7 with an open collector with the element output transistor closed and the collector open, the output potential of this element is determined by the potential of the point with which it is connected, i.e. it does not affect the input of the element - the load, the latter behaves as if its input is not connected to the logical code

(with a regular collector) element (break).

You can select the value of the resistor 2 in such a way that with open

the collector at the input of the inverter 3 (element AND-NOT 7 is closed) the potential of this input corresponds to the logical O. For series 133, 135, the level of logical 1 must be at least 2.4 V,

output value of logical o 0.4 V, permissible static noise level not more than 0.4 V, input current O not more than 1.5 mA. The magnitude of the resistor 2 is chosen as

Thus, with the maximum possible input current of the HE element 3, the voltage drop across the resistor will be

0.4 V, i.e. R,. 250 ohms 2 Y 1.6 mA

When one of the buttons is closed 8. resistors 1 and 2 form a voltage divider, which provides a potential of logical 1 at element Bxd of element 3. In addition, resistor 1 is included in the collector circuit of element AND-HE 7 as a current limiter.

The adjustable delay unit 5 can be made in the form of a shift register, controlled by a sequence of pulses. When the contacts are closed, there is a bounce (i, - i, fig. 2), which is fed through the element NO 3 to the single input of the trigger 4. The trigger 4 is turned on, on its

the output (and the input of the delay device) is set to logical 1, after a time overlapping the bounce time (for KM buttons it is several milliseconds),

a high potential corresponding to 1 reaches the output connected to the input of the element NAND 7.

At the inputs of this element, a combination of 1.1 is formed at the output — logical O (tj). In this way, the front of the pulse (negative polarity) is formed. Through the button, which is in the closed state, it enters the corresponding output of the sensor. After a time determining the duration of the pulse, the unit on the delay device reaches the output connected to the element 6. The element NAND 7 does not close. is established at its output

logical 1, the rising edge of the pulse (ij) is formed.

Simultaneously from the output of the element .HE 6 to the zero input of the trigger 4 pos3

logical O, trigger pbdgo tavala.ts to shutdown (i4). During the passage of a pulse, detected by the sensor, a single trigger input is 1, due to delays on elements 3 and 7 and inside the trigger, a situation may arise when the trigger is ready for a reset and the single input has not yet received 1 of the high voltage pulse . Trig rep may turn off. However, when O is set at the single input, its output will again be 1. The appearance at the input of the delay device of a short (several nanoseconds) negative polarity signal at its outputs does not affect.

When the button contacts open from the collector circuit of the IS-NOT 7, the resistor 1 is turned off, in the gap, at the single trigger input, a bounce, at zero - O. This bounce will turn the trigger on and off, and a series of chaotic signals (ie-t), but this will happen after the open

 -out

tr t,

Editor I. Segl Nick

Compiled by M. Tsygankov

Tehred O. Sopko 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, Projecto st., 4

contacts of the button, and these signals will not get to the output of the sensor. After t, the trigger assumes a stable zero state.

Claims (1)

Formula A multichannel single pulse sensor containing N pushbutton buttons, a power source, a trigger, and a NOT element connected between the first output of the adjustable delay unit and the first trigger output, the output of which is connected to the input of the adjustable delay unit, characterized in that, p. in order to increase its reliability, a second element, NOT, N + 1 resistors, the NAND element with an open collector, the output of which is connected via an (N + 1) -th resistor, is introduced into it. common bus, through the second element NOT - with the second input of the trigger, and through the closing contacts of the buttons - with the corresponding sensor outputs, each of which through the corresponding N resistors is connected to the power source. Jmr te 7 f ff Fog.2