SU805294A1 - Information input device - Google Patents

Description

The invention relates to automation and computer technology and is intended to enter information from the switching elements of the control panels and sensors in electronic control machines.

A feature of inputting information from switching elements is the need to • eliminate the transient process of switching contact bounce.

Known devices for inputting Infor- ¹ mation providing debouncing contacts introduction capacitors that provide input debounce delay time [1]. ₍

The disadvantages of such devices are low reliability and large dimensions due to the use of capacitors.

Also known are devices ispoleu- ₂ guides the digital signal processing with switching elements on and semiconducting components comprising input register, encoder, block valves, the register exchange and delay block ready signal [2].

The disadvantage of this device is the lack of protection against voltage failure at the input of the switching element, as well as the use of computers in the input circuit, which leads to its complexity.

Closest to the invention by technical solution is a device containing switching elements, triggers, a clock generator. pulses and output valves [3].

Disabling the input contact leads to the termination of the signal through the switching element to the trigger; pulses arriving at another trigger input change its state. From the trigger output, information through the gate gates' is issued to the electronic system. The power supply failure of the switching element (contact) is perceived by the trigger as well as its opening, and false information is issued to the system.

The purpose of the invention is to increase the reliability of inputting information during interruptions in the supply voltage and the bounce of the switching element.

This goal is achieved by the fact that in the device for inputting information containing a switching element connected to the first input of the first trigger, the pulse generator, the output of which is connected to the pulse distributor, the second trigger, the majority element, the third trigger, the first input of which is connected to the output of the majority element, the second input with the first output of the pulse distributor, the first input of the majority element is connected to the switching element, the second input of the majority the element is connected to the output of the first trigger and to the first input of the second trigger, the third input of the majority element is connected to the output of the second trigger, the second inputs of the first and second triggers are connected to the second output of the pulse distributor ..

Na'fig. 1 shows a diagram of a device;! ^, FIG. 2 is a timing diagram of its operation.

The device comprises a switching element 1, a first trigger 2, a second trigger 3, a majority element 4, a third trigger 5, a clock generator 6 and a pulse distributor 7.

The principle of the device is that the input of the majority element 4 receives three values of the input information taken from the output of the switching element, separated by time T. The majority element implements the majority function, that is, it transfers the value of information to the output that present on most inputs (two or three).

Let the input information at the moment be recorded in trigger 2 by the pulse from the output of the distributor 7, at the moment + T this information will be rewritten into the trigger by the next pulse from the output of the distributor 7, and the input information at the moment of time i _{0 will be} recorded in trigger 2. At time t- ₀ + 2T, information about the state of the switching element will go to the first input of the majority element 4, the second input of which will contain information from the output of trigger 2 at time tg + Т, and at the third input - from the output of trigger 3 at time instant b q.

From the output of the majority element 4, information is entered into the trigger 5 by the pulse from the output of the distributor 7 pulses. At the end of the named pulse, the output of the distributor 7 receives a pulse at the inputs of triggers 2 and 3, which provides input into trigger 2 at the time moment -t 2T, in trigger 3 at the time point -t ₀ + T. At the time point ίθ + ЗТ information will be recorded according to the result of the majority processing of the three values bc + 3t, t ₀ + 2t, t ₀ + t in trigger 5, and then the information will be recorded at time t ₀ + 3t in trigger 2 and ^ ρ + 2Τ in trigger 3.

In the event of a power failure (see Fig. 2) of the power supply for a time shorter than T, the information at the output of the switching element changes, and the information in trigger 5 does not change its value, since the correct information is stored at the two inputs of the majority element.

The device provides gecke and protection against contact bounce, since. contact bounce time is also less than T.

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Claims (2)

1. Goldenberg P. N, Pulsed and digital devices .. M., Sv z, 1973.3. U.S. Patent No. 36,262OS, -. 5 cl. 307-208, 1970 (prototype) 2. Copyright svneelestvo USSR N9 463109, cl. G 06 F 3/02, 1975.