SU1197902A1 - Device for controlling light indicator - Google Patents

Abstract

A DEVICE FOR CONTROLLING A LIGHT INDICATOR containing a power source, a square pulse generator, a trigger, the counting input of which is connected to the output of the generator, a signal and controlled lamps, a key element whose output is connected to a controlled lamp and a capacitor connected to the cathode of the diode and a resistor. which is connected to the anode of the diode and the negative pole of the power source, the positive pole of which is connected to the controlled and signal lamps, characterized in that, in order to increase reliability, it is equipped with an OR-NOT element, the second key element, AND elements, the first input of each connected to the output of the generator of rectangular pulses, the second input of the first element is connected to the forward output of the trigger, the inverse output of which is connected to the second input of the second element And, and the output of the first element And connect n to the input of the second key element, the output of which is connected to the signal lamp, the output of the second element AND is connected to the input of the first key element and to the first input of the element ILINE, the second input of which is connected to a point (L of the capacitor, resistor and anode diode, and the output is connected with the installation input to the trigger state one.

Description

The device relates to safety light signals and can be used to designate a tail mine train.

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

FIG. 1 shows a functional diagram of the proposed device; in fig. 2 - time diagrams of the device operation during normal operation and in case of malfunctions in the controlled lamp circuit.

The device contains a generator 1 rectangular pulses, the output of which is connected to the first inputs of the first and second logic elements 2 and 3, the second inputs of each of which are connected respectively to the direct and inverse outputs of the trigger 4, the counting input of which is connected to the output of the generator 1. Outputs logic elements 2 and 3 AND connected to the inputs of the key elements 5 and 6, the outputs of which are connected to the signal and controlled lamna 7 and 8, and the output of the second element 3 And connected to the first input element 9 OR NOT, the output of which is under The key is connected to the installation input to the unit state of the trigger 4, and the output of the key element 6 through the capacitor 10 is connected to the second input of the element 9 OR NOT to which the cathode of the diode 11 is connected, the anode of which is connected to one of the poles of the power supply. In parallel with the diode 11, a resistor 12 is connected.

The device works as follows.

From the output of the generator 1 of rectangular pulses, the signal is applied to the first inputs of elements 2 and 3 I, as well as to the counting input of trigger 4, the frequency of whose output signals is half the frequency of the generator. Connecting the direct trigger output to the second input of logic element 2 And, and the inverse to the second input of element 3 And allows you to get at the outputs of elements 2 and 3 And the pulses are out of phase relative to each other by half the period of the generator. The output signals of the AND elements control the operation of the key elements 5 and 6 included in the circuits of the lamps 7 and 8. In this case, alternate switching of the lamps of the light pointer is provided. In the case of normal operation of the controlled circuit (element 6, lamp 8), the capacitor 10 is periodically charged from the power source along the circuit: lamp 8 - resistor 12 and its discharge along the circuit: open key element 6 - diode 11. At the same time, the voltage at the second input of the element 9, OR-NOT becomes equal to the voltage of the power source after closing the element 6, and then slowly decreases as the capacitor charges and becomes zero when the element 6 is opened. The charge time of the capacitor is determined mainly by the resistor 12, whose resistance s achitelno above resistances 8. lamp charging circuit parameters and are chosen so that during the closed state of the element 6

the voltage across the resistor 12 maintains a level corresponding to the logical "1" at the second input of the element 9 OR NOT. With open element 6, the signal at the second input 5 of element 9 OR is NOT corresponds to the logical “O. During normal operation of the monitored circuit, the input signals of the element 9 OR-NOT constantly have different logical levels, and therefore, at its inverse output, the signal is permanently stored

0 is the zero level required for the operation of the trigger 4 in the counting mode, which ensures the formation of a control, their pulses for both keys.

The voltage at the characteristic points of the circuit during normal operation of the device is shown in the to-ti and t2-ts sections of the time diagram (Fig. 2). When the lamp 8 burns out or the element b is short-circuited (point ti in Fig. 2), the charge circuit of the capacitor 10 disappears and at the second input

Q of element 9 OR-NOT is established and the potential of the logical "O" is subsequently stored and, at subsequent appearance at its first input, also the logical "O at the inverse output of element 9 OR-NOT connected to the input of the zero setting

5 state of the trigger 4, the logical "1. In this case, the trigger 4 stops operation in the counting mode, a logical "1" is set at its direct output, and a logical "O" is set at the inverse. The constant presence at the second input of element 3 AND logical "O leads to the disappearance of control signals for key element 6, and the presence of the signal logical" 1 at the second input of element 2 And leads to the appearance at its output of pulses with a generator frequency that times higher

frequency output signals of elements and during normal operation of the device. At the same time, the lamp 7 starts to flash twice as often, indicating a fault in the controlled circuit. The ti-iz section of the time diagram (Fig. 2) shows the change in signals

 at the characteristic points of the circuit with the indicated damages in the controlled circuit.

When the key element breaks or short circuit occurs in lamp 8 (point 1h in FIG. 2), a full

the charge of the capacitor 10, while the voltage at the first input of element 9 OR-NOT changes from its maximum value to zero, and when the logical level "O (point t4 in Fig. 2) is reached and the presence of the same signal at its first input on

The output of element 9 OR-NOT appears logical "1, and this puts the circuit in the specified mode of operation. In this case, lamp 7 flashes twice as often as indicated by a fault in the monitored circuit. Signal changes in characteristic

5 points of the circuit when the key is broken or short-circuited in the lamp circuit is shown in the section ts-tj of the time diagram (Fig. 2).

Thus, due to the introduction of additional elements 2 and 3 AND, OR and their respective switching on, the device reliably monitors any malfunction in the circuit of the key element 6 - lamp 8

(burn-out of lamp 8, short circuit of key element 6 or its open circuit, short circuit in lamp circuit 8) and excludes obtaining false information about the state of the controlled circuit.

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Claims (1)

DEVICE FOR CONTROL OF LIGHT INDICATOR, containing a power source, a rectangular pulse generator, a trigger, a counting input of which is connected to the output of the generator, a signal and controlled lamp, a key element, the output of which is connected to a controlled lamp and a capacitor connected to the diode cathode and a resistor that is connected to the anode of the diode and the negative pole of the power source, the positive pole of which is connected to the controlled and signal lamps, characterized in that, in order to increase reliability, о is equipped with an OR-NOT element, a second key element, AND elements, the first input of each of which is connected to the output of the rectangular pulse generator, the second input of the first element And is connected to the direct output of the trigger, with the inverse output of which the second input of the second element And is connected, and the output the first element And is connected to the input of the second key element, the output of which is connected to the signal lamp, the output of the second element And is connected to the input of the first key element and to the first input of the element OR- <§ NOT, the second input of which for prison capacitor to a point of the compound of the resistor and the anode of the diode, and an output coupled to the setting input of the flip-flop to one state.