SU1718376A1 - Electric circuit changeover switch - Google Patents

Abstract

The invention relates to a pulse technique and can be used in switching installations of various purposes. The purpose of the invention is to increase speed and simplify the device for switching electrical circuits by reducing the number of elements. The loads 8 are switched on by pressing the corresponding button 4. When the button 4.1 is pressed, the positive voltage from the bus 6 arrives at the input of the OR element 3. At the output of which a positive voltage is generated, which returns or R on the RS input of the 2 flip-flop 2 of each cell 1 confirms the state of the trigger 2 in its initial position, in which the loads 8 are disconnected. 1 hp f-ly, 2 ill.

Description

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ABOUT

The invention relates to a pulse technique and can be used in switching installations for various purposes to turn on a certain electric circuit with a mandatory disconnection of a previously switched on circuit in any arbitrary order.

A device is known comprising remote switches, windings of recording and other that are controlled by pulses through the corresponding contacts of the switch.

The disadvantages of this device are complexity, low operational reliability due to switching the windings of remote switches through its own contacts.

It is also known a device comprising remote control switch buttons, decoupling diodes and a power source.

The drawback of the device is the presence in the control buttons of two pairs of contacts with three wires leading to them, which complicates the device as a whole.

The closest in technical essence to the invention is a device for switching electric circuits containing cells on RS-flip-flops, an OR element, cell control buttons and a reset button, the first terminals of which are connected to the first offset bus, R-input of the RS-trigger of each cell with the output of the OR element, the first input of which is connected to the second output of the reset button, the output of the RS flip-flop of each cell is connected to the second bias bus through the appropriate load.

A disadvantage of the known device is the low speed and complexity of the design.

The purpose of the invention is to increase speed and simplify.

This goal is achieved by the fact that in the device for switching electric circuits containing cells on RS flip-flops, the OR element, cell control buttons and the reset button, the first terminals of which are connected to the first offset bus, the R-input of the RS flip-flop of each cell is connected to the output of the OR element, the first input of which is connected to the second output of the reset button, the output of the RS flip-flop of each cell is connected to the second bias bus through the corresponding load, a single vibrator is inserted into each cell, the output of which is connected to the S-input of the RS flip-flop, and the input is connected to the second output of the corresponding control button and the corresponding input of the OR element, while the one-shot is made on the comparator, the inverting input of which is connected to the first terminals of the first and second resistors and through a capacitor to the common bus and the first output of the third resistor, the second output of which is connected to the inverting the input of the comparator, the second output of the second resistor and the input of the one-shot, the output of which is connected to the output of the comparator,

0, the second terminal of the first resistor is connected to the power rail.

FIG. 1 shows the scheme of the proposed device; in fig. 2 - one-shot circuit.

5 The device contains cells 1 on the RS-flip-flops 2, the element OR 3, the cell control buttons 4, the reset button 5, the first bias bus 6, the one-vibrator 7, the loads 8 and the second bias bus 9,

0 Mono-vibration 7 contains a comparator 10, resistors 11-13, capacitor 14, input bus 15 and output bus 16.

The purpose of the one-shot 9 is to form at the output a pulse at the time of decreasing the voltage at its input. Switching on loads 8 is accomplished by pressing the corresponding button 4. When pressing button 4.1, the positive voltage from the bus 6 bias is supplied to

0 input element OR 3, at the output of which a positive voltage is formed, which by R-input of the RS flip-flop of each cell 1 denies or confirms the state of the flip-flop in its initial position,

5 at which the load 8 is disabled.

Moreover, this state is forcibly held until all buttons 4 are released (in case several buttons 4 were turned on simultaneously). So

In this way, protection against simultaneous activation of several loads by mistake is carried out. The duration of the pulses from the single vibrators 7 is significantly less than the shutdown time of the buttons 4. Trigger 5 is used such that when it simultaneously receives positive voltage at its inputs, it establishes or retains its original condition.

0

After the last button 4 is released at the output of the element OR 3, the voltage becomes equal to zero, and at the output of the single-vibrator a pulse is generated,

5 to a command in which the corresponding trigger 2 is set to the position at which the load 8 connected to this trigger 2 is switched on.

Further work is similar to the one considered.

If after pressing button 4 the operator for any reason cancels his decision, he simultaneously presses the reset button 5 and then releases the corresponding button 4, and the activation of this load will be canceled.

Thus, in comparison with the known device, the speed is increased while the functional scheme is simplified.

One-shot 7 (Fig. 2) works as follows.

In the absence of voltage on bus 15, capacitor 14 is discharged, there is no voltage on bus 17.

When there is a voltage on the bus 15, the capacitor 14 is charged to the voltage determined by the values of the resistors 11 and 12 and the source 17 of the voltage, the voltage at the output of the comparator 10. is absent. This state can be arbitrarily large in time. At the moment when the voltage on the bus 15 drops to zero, a positive voltage is generated at the output of the comparator 10 during the entire discharge time of the capacitor 14.

The operation of this device does not depend on the frequency and duration of chatter when the buttons 4 and 5 are turned on and off. This is an additional advantage of the proposed technical solution.

Claims (2)

Claim 1. A device for switching electrical circuits containing cells on RS-flip-flops, an OR element, cell control buttons and a reset button, the first terminals of which are connected to the first offset bus, R-input of the RS-flip-flop of each cell connected to the output of the OR element, the first input of which is connected to the second output of the reset button, the output of the RS flip-flop of each cell is connected to the second bias bus through an appropriate load, characterized in that, in order to improve speed and simplify, each cell is entered a one-shot, the output of which is connected to the S-input of the RS flip-flop. and the input is connected to the second output of the corresponding control button and the corresponding input of the OR element. 2. The device according to claim 1. that is, that the one-shot is performed on a comparator, the non-inverting input of which is connected to the first terminals of the first and second resistors and through a capacitor to the common bus and the first terminal of the third resistor, The second output of which is connected to the inverting input of the comparator, the second output of the second resistor and the input of the one-shot, the output of which is connected to the comparator output, a second terminal of the first resistor is connected to the power rail. ten sixteen -