SU1317475A1 - Digital indication device with checking - Google Patents

Abstract

The invention relates to the field of radio electronics and can be used in devices for displaying information. The purpose of the invention is to increase the reliability of the control. The device contains indicators 1, binary-to-segment converters 2, blocks 3 of simultaneous illumination of indicator segments, counting decades 4, comparison blocks 5, first element OR 6, clock 7, driver control pulses 8. This device allows to detect faults of the type “Open and short circuit. If there is a malfunction, the device switches to the diagnostic mode B, in which the luminescence of all serviceable elements of the indicators of indicators alternates with their extinguishing, according to a nonshaft, this element determines which element is out of order. 2 3. p. F-ly, 2 ill. and S with 4 SP

Description

The invention relates to radioelectronics and can be applied in digital information display devices.

The aim of the invention is to increase the reliability of the control.

FIG. i shows the block diagram of the device; in fig. 2 - execution of a block of simultaneous illumination of indicator segments.

The device contains indication blocks 1, binary-to-segment converters 2, blocks of simultaneous illumination of indicator segments 3, counting decades 4, comparison blocks 5, first element OR 6, clock generator 7, driver of control pulses 8, counting trigger 9, first and second elements AND 10, 11, second and third elements OR 12, 13, D-trigger 14, 1K-trigger 15, third, fourth and fifth elements AND 16-18, element NOT 19, element OR 20.

The device works as follows.

When the ts device is operating in the display mode, information is displayed on the digital indicators, which are entered into the device from the counting decades.

Periodically (with a repetition period of 7 clock pulses, which is chosen to be about 1 second), the display device is monitored. In each cycle of control, alternating pulse signals are received from the driver 8 of the pulse generator. The duration of the pulses is small, on the order of several .MX, in order not to disrupt the normal operation of the display device (not to reduce the brightness and not to allow parasitic illumination).

In the first cycle of control, the impulse impulses arrive at the inputs of converters 2 of binary code into a segment code and cause the control key stages of the converters to be turned off. In this case, in the absence of breaks in the chains of the indicator segments, all information inputs of the comparison block of this indicator receive signals corresponding to "1. At the same time, a signal corresponding to " 1 is supplied to the control inputs of the comparison unit 5 from the third output 8 of the driver for controlling the pulses. From the output .. block 5 of the comparison, the signal corresponding to "O (or according to the signals at the information inputs and the control input of the comparison block -) is fed to the input of the element OR 6. In a similar way, the signals are determined. the inputs of the element OR 6. Therefore, in the absence of breaks in the chains of segments of all indicators of the device from the output of the element OR 6, the signal corresponding to “O is fed to the second input 8

five

control pulse generator The device continues operation in the display mode.

In the next tick control pulses

"The light from the first output 8 of the driver control pulses is fed to the control inputs of the blocks of simultaneous illumination of the indicator segments 3, causing the feed to the inputs of the converters 2

0 code corresponding to the glow of all indicator segments. Iri it is. All key stages of converters 2 are switched on even if there are no short circuits in the chains of indicator segments and open circuits in the control keys of indicator segments and open circuits in the control circuits of this indicator, the information inputs of the comparison unit 5 receive signals corresponding "O. At the same time, a signal corresponding to "O" is applied to the control input of the comparison unit 5. From the output of the comparison units 5, the signals corresponding to the "About the correspondence of the signals at the information inputs and the control input of the comparison blocks) arrive at the inputs of the element OR 6. Therefore, in the absence of a short circuit in the circuit segments of the indicators 1 and breaks in the circuits of the control keys of the transducers 2, from the output of the element OR 6, the signal corresponding to "O, arrives at the second input 8 of the driver of control pulses. The device continues to work in the display mode.

If in any cycle of self-control in 0.1NOM (or several) of the indicators 1 there is a defect or short circuit in the circuit of the segment, or there is an interruption in the circuit of any control key of the converter 2, this will cause a discrepancy signal at its corresponding output, i.e., at the corresponding informational input of the comparator unit and the signal at the control input of the comparator unit. At the same time, the signal corresponding to "1, from the output of the block compared to Ш1 through the element OR 6 is fed to the second input of the block 8 forming control signals and causes the display device to enter the diagnostic mode.

In the diagnostics mode, from the first and second outputs 8 of the control signal generator, the signals “Enhance and” Light of one control cycle (repetition period of the GTI 7) are sent respectively to the control inputs of the code converters and blocks of simultaneous illumination of indicator segments, causing the device to work mode display

5 blinks, when the blanking of all indicators alternates with the glow of all serviceable indicators (segments). According to a non-flash (in blinking mode) indicator (seg0

ment) the operator identifies the fault location.

When the shaper 8 is in control mode (operating mode of the display device), the clock pulses (of positive polarity of the order of a few μs) from the first input of the shaper arrive simultaneously at the clock (counting) input of the counting trigger 9 and of the second AND elements I. The counting trigger 9 provides alternate supply of clock pulses to the output of the first 10 and second 11 elements AND, and then through the first 12 and second 13 elements OR to the first and second outputs of the driver with responsibly. D-trigger 14, and accordingly 1K-trigger 15 are in the initial (zero) state, because their information inputs (D and 1-inputs) at the time of arrival of the clock pulses receive signals corresponding to "O, from the second input the driver and the output of the D-flip-flop respectively, and the input corresponding to "1.

When a fault is detected in the display device, the driver of the control pulses 8 enters the diagnostic mode. In this case, from the second input of the block to the information input of the D-flip-flop 14, a signal is received corresponding to "1, which causes the D-flip-flop to be switched to the" one state (with the arrival of a clock pulse) and the "Glow light on the first shaper output signal. With the arrival of the next clock pulse, the 1K-flip-flop switches to the one state, to the information input I of which the output signal of the D-flip-flop is fed (the input corresponding to the "1" is constantly fed to the K input). At the same time, the “Enhance” signal appears at the second output of the control pulse shaper. The nature of further changes in the output signals of the “Light and Glow” block, and consequently, the flashing pattern in the display device, is determined by the type of defect detected in the display device.

Claims (3)

Invention Formula A device for digital indication with control, containing counting decades, binary-to-segment converters, the outputs of which are connected to the indicator inputs and to the information inputs of the comparison units, a clock generator, the first element OR, the inputs 0 0 which are connected to the outputs of the comparison units, characterized in that, in order to increase the reliability of the control, a driver of control pulses and blocks of simultaneous illumination of indicator segments, whose information inputs are connected to the outputs of counting decades, are entered into the device, and information outputs are connected to the inputs of binary code converters in the segment, the output of the clock pulse generator is connected to the first input of the driver of control pulses, the second input of which is connected to the output of the first element and OR, control inputs of blocks of simultaneous 5 illumination of indicator segments, binary-to-segment converters and comparison blocks are connected to the first, second and third outputs of the control pulse generator, respectively, whose third and fourth inputs are the first and second control inputs of the device. 2. The device according to claim 1, characterized in that the driver of the control pulses contains a counting trigger, the first and 5, the second elements AND, the second and third elements OR, D-flip-flop and K-flip-flop, whose inputs are the third input of the shaper, the direct output of the counting flip-flop is connected to the first input of the first element I. And the inverse output goes to the first input of the second element And is the third output of the generator, the input of the counting trigger is connected to the second inputs of the elements AND with the C-d of the D-trigger and the K-trigger and is the first input of the form.h. The K5 input of the K-flip-flop is also the input of the driver. The outputs of the elements And are connected to the first inputs of the second and third elements OR, the second inputs of which are connected to the outputs D and K-flip-flops, respectively, the outputs of the elements OR are the second and third outputs, and the D-input of the D-flip-flop is the second input of the control pulse generator . 3. The device according to claim 1, characterized in that the block of simultaneous illumination of the indicator segments contains the third, fourth and fifth elements of AND, the fourth OR element and the NOT element, the outputs of the AND element and the OR element are information outputs of the block, the first inputs elements and connected to the output The 0 NO element, whose input and the first input of the OR element are the control input of the block, the inputs of the element and the OR element are information inputs of the block. 0 0 five entrance sixteen in / out