SU1339542A1 - Digital circuit controlling device - Google Patents

Abstract

The invention can be used in control devices to manually change the content of reversible counters using buttons. By introducing into the device, based on the use of a square-wave generator with start-up delay, two D-flip-flops, a resistor, a capacitor and a diode, the accuracy of the device when setting the reference is increased and the setting time of the reference is reduced. 2 Il.

Description

one

The invention relates to the field of control and can be used in control and other automation devices for manually changing the content of reversible counters using buttons.

The purpose of the invention is to improve the accuracy of the device when setting the task and reducing the time of the device. After releasing the button on

new tasks,

Figure 1 shows the block diagram of the proposed device; Fig. 2 shows an embodiment of the generator.

The device contains the first 1 and second 2 control buttons, the first 3 and second 4 elements AND, the element OR 5, the generator 6 rectangular pulses with a start delay, the first 7 and second 8 outputs of the device, the first 9 and second 10 D-flip-flops, diode P , resistor 12, capacitor 13.

The device works as follows.

In the initial state at the outputs of the first 1 and second 2 control buttons, at the inverse output of the element OR 5, at the output of the generator 6 and at the inverse outputs of the first 9 and second 10 D-flip-flops there is 1, at the direct outputs of the element OR -5 and the first D-flip-flop 9, as well as the outputs of the elements And 3 and 4 - O, the capacitor 13 is in a discharged state.

After pressing one of the control buttons, e.g. The second D flip-flop is reset.

At the output of the generator 6, a negative pulse is formed, which is inverted by the first element I 3 and is fed to the first output 7 of the device. The leading edge of the pulse sets at the direct output of the first D-flip-flop 9 1, and at the inverse output - O, while the generator 6 is prohibited. The capacitor 13 is charged through the resistor 12, and after a time t 0.3 - 0 , 5 s, the voltage on the capacitor 13 reaches the level 1; the first D-flip-flop 9 is reset; at the inverse output of which a positive differential is formed,

422

stopping at the inverse output of the second D-flip-flop 10 O, prohibiting re-setting at the direct output of the first D-flip-flop 9 1. After resetting the first D-flip-flop 9, the generator 6 is started, the output pulses of the last through the first element 3 come to the first output 7 of the mouth 0

5 o

5 Q

five

0

the first input of the first logical element 3 is set to 1, prohibiting the passage of pulses from the generator 6 to the output 7 of the device, to the direct output of the element OR 5 O is set, the capacitor 13 is discharged through diode 11, to the inverse output of the element OR 5 it is set to 1, resetting the second D-trigepio.

Thus, after each pressing one of the control buttons, one pulse is formed at the corresponding output of the device, and with a delay of 0.3-0.5 seconds, a continuous pulse sequence is formed with a frequency determined by the generator frequency, and after the button is released, the signal at the output of the device stops. Such operation of the manual control device allows a long press of the control button to quickly approach the desired value of the signal at the output of the controlled device, and then briefly press the control button for a time less than 0.3-0.5 to precisely set the desired value of the signal.

A delayed start pulse generator 6 can be performed by any known method (an embodiment of the invention is shown in FIG. 2). The generator 6 contains an HP 14 element, a resistor 15, a diode 16, a capacitor 17, an AND-18 element, resistors 19 and 20, a capacitor 21, an 2IL-NOT 22 element, a HE 23 element from a series-connected delay element and a controlled generator, an input the delay element is connected to the control input of the generator 6.

The delay time of the generator start 6 rectangular pulses is determined by the delay time of the delay element, and the frequency of the generator 6 is determined by a constant time the time of the backward circuit of the controlled oscillator. Such an implementation of generator 6 allows setting the delay time

59

pulses independently of each other.

The delayed square pulse generator operates as follows.

When the input signal changes from level I to level O, the output of element 14 is set to 1, diode 16 is closed, and capacitor 17 starts to charge through resistor 15. When the voltage across a capacitor

17 reaches the value of the switching voltage at the output of the element AND NOT

18 is set to O, enabling the operation of the generator performed on elements 19-23, and a continuous pulse sequence occurs at the generator output. After changing the input signal from the level O to level 1, the output of the element I4 is set to 0 and at the same time the output of the element I-NE 18 is set to I, the operation of the generator performed on elements 19-23 is prohibited and its output is set to 1. Condenser 17 through diode 16 is quickly discharged and the circuit returns to its original state.

The device eliminates the influence of bounce contacts also when they are blended. In this case, at the inverse output of the element OR 5 and at the input of the element NOT 14, a burst of bounce pulses from the state O to 1 occurs, at the output of the element NOT 14 a burst of pulses from the state 1 to O occurs. The first impulse of this pack through a low output impedance of the element NOT 14 and diode 16 discharges capacitor 17, the signal at the second input of the element AND-NOT 18 becomes O, preventing the transmission of the bounce pulses through the first input of the element AND-NOT 18, therefore the output of the element NOT 23 pulses stop

39542

immediately after the first unlock any button.

Claims (1)

Invention Formula A device for controlling digital circuits containing a generator of rectangular pulses with a delay of 10 start, control buttons, the outputs of which are connected respectively to the first inputs of the AND elements and the corresponding inputs of the OR element, the inverse output of the OR element connected to the input of the control of the generator of rectangular pulses the start delay, the outputs of the AND elements are the outputs of the device, characterized in that, in order to improve the accuracy of the device, the first and second D-flip-flops, a resistor, capacitor and diode, an OR gate is provided with a direct outlet, a generator of rectangular pulses 25 with a start delay is provided with a second control input, the inverse output of the OR element is connected to the R-BXO second D-flip-flop, the direct output of the OR element is connected to the cathode of the diode, the anode of which is connected to the R-BXO-d of the first D-flip-flop through a resistor to the direct output of the first D-trigger and through a capacitor to a common bus; direct output of the first D-trigger is connected to the second control input of the rectangular pulse generator with a start delay, the inverse output to the clock input of the second D- trigger, C input first A D-flip-flop 40 is connected to the output of a rectangular pulse generator with a start delay and to the second inputs of the AND elements, the D input of the first D flip-flop is connected to the inverse output of the second D-flip-flop, the D input of the second D-flip-flop is connected to the power bus. Phage.1 Editor I.Gorn Compiled by G.Nefedov Tehred M. Khodanich Proofreader A.Obruchar 4222/38 Circulation 672 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production printing enterprise, Uzhgorod, st. Project, 4 2