JPS5812719B2 - Circuit element quality determination device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for determining the quality of circuit elements for detecting breakage, etc. of all indicator lights for indicator lights of electronic display boards currently used in various forms, and in particular for indicator lights of indicator lights. A circuit element that can automatically detect core breakage in electronic display boards that are displaying characters and automatically determine the quality of thyristors connected in series with indicator lights. This invention relates to a determination device.

Various conventional core breakage detection devices have been proposed for this type of indicator light, but they generally have the disadvantage of being uneconomical because the circuit configuration is complicated, the storage space increases, and the price increases. , and could not be adopted.

However, the conventional method of preventing display characters from being lost due to breakage of indicator lights on various electronic display boards has been to have maintenance personnel patrol regularly, visually check, and replace them. There is.

However, in recent years, with the development of motorization, the role played by automobiles has increased.

On the other hand, it is essential to provide appropriate notification of road conditions using electronic display boards.

Under these circumstances, if the indicator lights on the electronic display board are checked using conventional equipment, indicator lights that have been broken during inspection rounds will be left unlit, and the characters may not be written correctly depending on how the indicator lights are lit. Current electronic display panels increase the risk of misreading displayed characters and lack the required proper driver instructions.

In order to eliminate this situation, it is best to notify the commanding party immediately if there is a break in the indicator light.

In view of the above-mentioned points, the present invention provides a device for determining the quality of a circuit element, which solves such problems and eliminates such drawbacks. In a non-contact indicator light lighting device in which an indicator light is lit by ignition, an exclusive OR circuit is provided that operates as a human input signal using the ignition signal voltage applied to the gate of the thyristor and the voltage appearing at the anode of this thyristor. This circuit is designed to automatically detect disconnection of an indicator light, conduction failure of a thyristor, and non-conduction failure of a thyristor based on the presence or absence of an output signal caused by the state of change in the input signal of the exclusive logic summation circuit. be.

Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 is a block diagram showing an embodiment of a device for determining the quality of circuit elements according to the present invention.

In the figure, LP is an indicator lamp to which a pulsating lamp voltage PC is applied, SCR is a thyristor connected in series to the indicator lamp LP, and EX-OR is the ignition signal voltage applied to the gate G of thyristor SCR and the thyristor SCR. an exclusive OR element that operates using the voltage appearing at the anode A of as an input signal;
M is a memory that inputs the lighting control signal S and is reset by the reset signal R3.The connection point between the indicator light LP and the anode A of the thyristor SCR whose cathode K is grounded is a diode D and a resistor R1 connected in series. The gate G of the thyristor SCR is connected to the output terminal of the memory 1M, and the other gate input terminal of the exclusive OR element EX-OR is connected to the gate G of the thyristor SCR. It is connected to the.

Further, the connection point between the resistor R1 and one gate input terminal of the exclusive OR element EX-OR is grounded via a resistor R2 and a capacitor C in parallel, and the gate G of the thyristor SCR is grounded via a resistor R3. ing.

Next, the operation of the embodiment shown in this figure will be explained.

First, as a general non-contact indicator lamp lighting method, an indicator lamp LP and a thyristor SCR are connected in series, a pulsating lamp voltage is applied to both ends of the indicator lamp, and a gate G of the thyristor SCR is applied.
When a positive (+) voltage is applied to the thyristor SC
A method is adopted in which R becomes conductive and the indicator lamp LP lights up.

Here, when looking at the voltage appearing at the anode A of the thyristor SCR using the above circuit system, when the thyristor SCR is non-conducting, the pulsating lamp voltage appears as is, but when it is conducting, it becomes Ov.

In this way, it is possible to detect the presence or absence of the voltage applied to the gate G of the thyristor SCR and the voltage appearing at the anode A, and determine whether the indicator lamp LP is broken or the thyristor SCH is defective based on the mutual relationship.

Now, in the figure, when the output voltage of the memory M is zero, no voltage is applied to the gate G of the thyristor SCR, the thyristor SCR becomes non-conductive, and the indicator lamp LP does not light up.

At this time, the voltage signal at the anode A of the thyristor SCR is "1".

The signal of this anode A is transmitted through diode D and resistor R.
1 to one end of the gate of exclusive OR element EX-OR.

On the other hand, the output line of the memory M is connected to the other input gate of the exclusive OR element EX-OR, and the signals at both input gates of the exclusive OR element EX-OR in this state are "1" and "
0", and the output signal OUT of the exclusive logic buried phase element EX-OR at this time becomes "1".

Further, when the output signal of the memory M is "1", a voltage is applied to the gate G of the thyristor SCH, the thyristor SCR becomes conductive, and the indicator lamp LP lights up.

At this time, the voltage signal at the anode A of the thyristor SCR becomes zero.

In this state, the output signal of the memo JM is "1", so the gate signals of both inputs of the exclusive OR element EX-OR are "0" and "
1", and its output signal OUT becomes "1".

The above state describes the control operation when the indicator light LP and thyristor SCR are operating normally.
Next, a case of a defective state will be explained.

First, to explain the case where a break occurs in the indicator light LP, when the gate signal of the thyristor SCR is zero, the anode A signal of the thyristor SCR does not become "1" but becomes "0", and the exclusive logic compensation element EX Both input gate signals of -OR become "0" and "0", and this exclusive OR element EX-OR
The output signal OUT becomes "0".

In addition, if the thyristor SCR does not fire and becomes non-conductive despite the gate signal "1", the thyristor SC
The anode A signal of R continues to be "1", and both gate input signals of exclusive OR element EX-OR become "1" and "1", and the output signal OUT of this exclusive OR element EX-OR becomes "1".
0”.

A summary of these state changes is shown in the table below.

As is clear from the above table, when the indicator light LP or the thyristor SCR is normal, the output signal OUT of the exclusive logic summing element EX-OR is "0" or " “1” regardless of the state of 1′
However, when a defective state occurs, the output signal OUT of the exclusive logic-add element EX-OR becomes "0".

In this way, depending on the presence or absence of the output signal of the exclusive OR element EX-OR, it is possible to automatically detect the disconnection of the indicator lamp LP, the conduction failure of the thyristor SCR, and the non-conduction failure of the thyristor SCR.

It should be noted that the output signal of this exclusivity logic summing element EX-OR is notified to the command side via an OR gate together with output signals of other systems (not shown).

The present invention has been described above using an example in which an exclusivity logic buried element is used to determine the quality of a circuit element consisting of an indicator light and a thyristor, but the present invention is not limited to this. Verification can also be performed using an exclusive OR circuit using a combination of OR gates.

As is clear from the above description, according to the present invention, it is possible to obtain exclusive control without using complicated means by inputting the ignition signal voltage applied to the gate of a thyristor and the voltage appearing at the anode of the thyristor. With a simple circuit configuration that includes a theoretical compensation circuit, it is possible to automatically detect core breakage in indicator lights and on electronic display boards that are displaying characters, as well as automatically judge whether the risk is good or bad. Since it can be carried out, the practical effect is extremely good.

In addition, it is extremely effective in that it can solve all kinds of inconveniences because it eliminates the need to rely on manual inspection operations by going around the circuit as in the past. This is a unique device for determining the quality of elements.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a device for determining the quality of circuit elements according to the present invention. LP... Indicator light, SCR... Thyristor, EX-OR... Exclusion logic compensation element, M...
···memory.

Claims (1)

[Claims] 1 In a non-contact indicator lighting method in which an indicator light and a thyristor are connected in series and the indicator light is lit by the ignition of the thyristor, the ignition signal voltage applied to the gate of the thyristor and the voltage appearing at the anode of the thyristor are The exclusive logic summation circuit inputs the voltage of A device for determining the quality of a circuit element, characterized in that it automatically detects the