JPH0573624B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is for inputting the switching direction of a railway switch directly to an electronic interlocking device without going through a relay. , no current) is used as a fail-safe input circuit.

[Conventional technology]

An interlocking device is installed as a control device that utilizes the signal equipment inside the station to ensure the safety of train operation. In order to prevent a dangerous situation from occurring due to a failure of the interlocking device, the device has a fail-safe structure, but this requires that the status of the field equipment be entered without error. A switch machine is also a type of field equipment, but since the switching direction is transmitted by the current polarity of the display line, there are three types (according to the positive polarity, negative polarity, and no current state). The input is made using the signal relay (point display relay: KR) of the operating position.

Currently, relay interlocking devices are being replaced by electronic interlocking devices using computers.
The switching direction of the point machine is similarly determined by reading the normal position and opposite position contacts of the point display relay from the input circuit.

[Problem that the invention seeks to solve]

In electronic interlocking devices, the logic part has been replaced with a computer, making them much smaller than conventional relay interlocking devices, but the signal relay remains in the interface section, making it more compact and economical. This was considered a problem in terms of implementation.

However, until now, it has been difficult to develop a small, fail-safe electronic circuit that can replace the three-position point display relay.

The present invention has been made in view of the above-mentioned circumstances, and is a switch that is directly connected to the display line of a switch and outputs an output to an electronic interlocking device according to the switching direction of the switch. The purpose of this invention is to provide a fail-safe circuit that can be replaced with a display relay.

[Means to solve the problem]

For this reason, the present invention provides two basic circuits 5 in parallel that receive the current of the display line 4 of the switch and detect the direction of the current (positive, negative), thereby detecting the current generated when switching the switch. Allows identification of no-current conditions and circuit failures. Further, the basic circuit 5 has a configuration in which a positive direction current detection circuit 6 and a negative direction current detection circuit 7 which detect the polarity of the current are connected in series. The positive direction current detection circuit 6 is connected in series with the photocoupler F1 which outputs a switching direction (positive) current presence signal to the electronic interlocking device when there is a positive direction current, and the circuit for the purpose of diagnosing the photocoupler circuit. In addition to having a photocoupler F2 inserted into the circuit, it also includes two diodes D1 and D2 for bypassing current in the opposite direction. On the other hand, the reverse current detection circuit 7
has the same configuration as the above-described forward current circuit 6, but is connected in the opposite direction to the circuit.

[Effect]

This allows the status of the switch machine to be directly input to the electronic interlocking device with a simple circuit, and
Since it is possible to detect failures in the circuit elements constituting the present invention, such as photocouplers and diodes, and in the input circuits of electronic interlocking devices, it is possible to prevent incorrect input values from being input and causing dangerous situations. , a highly safe input circuit for electronic interlocking devices can be realized.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. FIG. 1 is a diagram showing a circuit configuration of the present invention, and FIG. 2 is an embodiment of the present invention.

In FIG. 2, numeral 1 indicates an input circuit for an electronic interlocking device of the present invention, 2 a switch machine, 3 an electronic interlocking device, and 4 a display line of the switch machine. Corresponding to the switching direction of the switch machine 2, a positive current and a negative current flow through the display line 4, and are input to the input circuit 1 for an electronic interlocking device of the present invention. The input circuit 1 for the electronic interlocking device has an output f2 corresponding to the direction,
f3 is output to the electronic interlocking device 3.

Next, details of the input circuit 1 for an electronic interlocking device according to the present invention will be explained using FIG. In Figure 1, 5
is a basic circuit for detecting the polarity of a current, and the basic circuit 5 is constructed by connecting in series a positive direction current detection circuit 6 and a negative direction current detection circuit 7 for detecting the current direction of the display line 4. Further, the forward current detection circuit 6 is composed of photocouplers F1 and F2 and diodes D1 and D2. Photocoupler F
2 is energized when a current in the forward direction is input, and the output f2 to the electronic interlocking device 3 is set to "1", which indicates that a current in the forward direction is present. The photocoupler F1 is used to arbitrarily interrupt the current flowing through the photocoupler F2, and if the value of the output f2 changes to "0" by cutting off the line, it can be guaranteed that the circuits such as the photocoupler F2 are normal. . In addition, the diodes D1 and D2 are connected to these photocouplers F1 and F.
This is provided to bypass the current in the opposite direction to 2. On the other hand, the negative direction current detection circuit 7 detects the presence or absence of a negative direction current in the display line 4, and has exactly the same circuit configuration as the above-mentioned positive direction current detection circuit 6, but the current direction is reversed. is connected to.

If the point machine 2 is now switched to the localization side, the current direction of the display line 4 will be the positive direction, but if the photocoupler F1 is ON at this time, the current will be F1 → F2 → D3 → D4 Since the signal flows through the path, the output f2 becomes "1". Furthermore, if the photocoupler F1 is turned off, the path is cut off, so the output f2 becomes "0". Therefore, when the photocoupler F1 is turned ON and OFF, the value of the output f2 from the photocoupler F2 for each is as follows: (“1” →
0), the electronic interlocking device 3 can determine that the switch 2 has been switched to normal position. At this time, the output value from the opposing photocoupler F3 becomes ("0"→"0"). Next, switch machine 2
When F4 changes to the opposite side, the current in display line 4 has negative polarity, so depending on the state of photocoupler F4,
When it is ON, the current flows from F4 to F3 to D2 to D1, and the output f3 becomes "1". Further, when the switch is OFF, the output f3 becomes "0". Therefore, by turning the photocoupler F4 ON and OFF, the output f3
If it changes from (“1” to “0”), it can be recognized as a reversal. On the other hand, if a failure occurs that causes photocoupler F3 to turn on regardless of the presence or absence of input current and output f3 to "1",
Output f3 even if photocoupler F4 is turned on and off
becomes (“1” → “1”), and can be distinguished from normal input. Further, the diagnosis performed at the time of inputting these signals can detect a failure in the input circuit inside the electronic interlocking device 3, so that it is effective in ensuring safety and maintainability.

By the way, when the switch 2 is switched, the current in the display line 4 becomes no current, so the photocoupler F
1. Output f2, f3 when F4 is turned on and off
Both become (“0”→“0”). In this case, the outputs of the two basic circuits 5 are both (“0” →
This becomes “0”), making it possible to determine that it is a failure.

In addition, the input circuit 1 for an electronic interlocking device according to the present invention has the feature that by comparing the outputs of the two basic circuits 5, it is possible to diagnose the failure of the electronic interlocking device 3 and the circuit of the present invention even in normal conditions. .

〔Effect of the invention〕

As described above, according to the circuit of the present invention, the positioning and reversing information of the point machine can be accurately and without error.
Moreover, since it can be directly incorporated into the electronic interlocking device without going through a point display relay, the electronic interlocking device can be miniaturized and costs can be reduced, which has great effects. Furthermore, even if a failure occurs in the circuit itself of the present invention, not only will information not be input erroneously, but the failure can be detected on the electronic interlocking device side while maintaining the functionality of the circuit, so it is expected to improve maintainability. .

The circuit of the present invention can be widely used not only as an input circuit for display lines of switch machines in railway signals, but also as an input circuit for equipment that directly outputs physical quantities by changing the polarity of current. It can contribute to the development of microelectronics in fields that require high performance.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a circuit according to the present invention, and FIG. 2 is a block diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Input circuit for electronic interlocking device, 2...Switch machine, 3...Electronic interlocking device, 4...Display line, 5...
...Basic circuit, 6... Positive direction current detection circuit, 7...
Negative current detection circuit, F1, F2, F3, F4...
...Photocoupler, D1, D2, D3, D4...Diode, f2, f3...Output.

Claims (1)

[Claims] 1. In an input circuit for an electronic interlocking device having two basic circuits 5 arranged in parallel, each basic circuit 5 is connected to the subsequent stage of the display line 4 indicating the switching direction of the switch machine 2. The positive direction current detection circuit 6 is composed of a series connection of a positive direction current detection circuit 6 and a negative direction current detection circuit 7, and a series connection body of first and second photocouplers F1 and F2, and a It consists of a series connection body of first and second diodes D1 and D2 connected to a second photocoupler F2.
outputs a signal f2 indicating that there is a positive current in response to a positive current input to the electronic interlocking device 3, and the first photocoupler F1 arbitrarily interrupts the current flowing to the second photocoupler F2 in response to an external signal. The first and second diodes D1 and D2 bypass the reverse direction current to the first and second photocouplers F1 and F2, thereby forming a negative direction current detection circuit. 7 has the same circuit configuration as the positive direction current detection circuit 6, and is connected so that the current direction is reversed, and F3 sends a signal indicating that there is a negative direction current in response to a negative direction current input. An output f3 is sent to the electronic interlocking device 3, and the fourth photocoupler F4 arbitrarily interrupts the current flowing through the third photocoupler F3 according to an external signal to diagnose the circuit. D1 and D2 are input circuits for an electronic interlocking device, which bypass currents in the opposite direction to the first and second photocouplers F1 and F2.