KR200272141Y1 - Circuit for preventing errors of digital output for local data transmission system - Google Patents

Abstract

The present invention relates to a malfunction prevention circuit of a control signal output unit mounted in a local data transmission system that is a component of a conventional railway signal system network. More specifically, the first photocoupler is input by the control data from the main control unit 230 of the conventional local data transmission system is activated by each output signal generated through the shift register (REG 1 to REG N) An input terminal of the photocoupler U1 in the digital output unit 240 including U1 and a power amplifier U2 having an input terminal P2 connected to an output terminal P1 of the photocoupler U1. Result value of the output terminal P6 of the comparator U4 to which the signal of P0 and the signal of the output terminal P5 of the second photocoupler U3 activated by the signal of the output terminal P4 of the power amplifier are input. Characterized in that the input to the main control unit 230.

Description

Circuit for preventing errors of digital output for local data transmission system {Circuit for preventing errors of digital output for local data transmission system}

The present invention relates to a malfunction prevention circuit of a control signal output unit mounted in a local data transmission system that is a component of a conventional railway signal system network.

In general, the signal network for configuring the train operation control system for controlling the operation of the train is the command signal facility 100 of the operating command room for comprehensive monitoring of the overall operation of the train and the interlocking device for the train operation installed on the actual track , Is divided into a field signal equipment 300, such as a train, a signal, a track, etc., wherein, the field signal equipment 300 is divided into a train interval by the electric signals due to the change of state during the train operation The data is transmitted to the local data transmission system 200 (local data transmission system, commonly referred to as LDTS) allocated for each section.

On the other hand, the local data transmission system 200 transmits the electrical status information of the field signal facility 300 to the command signal facility 100, based on the signal of the transmitted field signal facility 300 command signal facility ( The operating state of the train is automatically controlled by the total traffic control device 110 installed in the 100.

To this end, the integrated signal control device 110 includes the LS (Line Station) terminal 120 and the operator who are represented by a symbol shaped in a similar shape to the signal equipment in the field so that the operator can monitor the state of the line. A MMI (Man Machine Interface) terminal 130 serving as an interface for giving a command to directly control a signal facility is installed.

The operation of the signal network for configuring the train operation control system configured as described above is the integrated signal control device 110 automatically monitors the operation state of the train according to the operation schedule of the train given by each train unique number, This is all done. If the situation does not operate according to the scheduled driving schedule due to the occurrence of an unexpected situation, the integrated signal control apparatus 110 accepts the operator's operation of the MMI terminal 130 to allow the operator to intervene. The control signal of the on-site signal facility 300 by the operator's intervention is transmitted to the on-site signal facility 300 by the local data transmission system 200, thereby operating the signal facility.

The local data transmission system 200 for the operation of the signal facility as described above has a configuration as shown in Figure 1, receiving the electrical signals from the field signal facility 300 to convert them to digital, On-site facility interworking device 210 for converting the control data to be transmitted to the field signal facility 300 to analog, a digital input unit 220 for inputting the converted digital data to the main control unit 230, and the digital input unit ( Main control unit for transmitting the data transmitted from the 220 to the command signal equipment 100, and generates control data for controlling the field signal equipment 300 according to the control signal received from the command signal equipment (100) And a digital output unit 240 for outputting the control data generated by the main control unit 230 to the field facility interlocking device 210. The control data output from the digital output unit 240 is converted into an electrical signal by the field facility interlock device 210 is transmitted to the field equipment 300, the field equipment is controlled by this signal.

In particular, of the local data transmission system 200 configured as described above, the digital output unit 240 is configured as a block diagram as shown in Figure 2a to 2b attached.

2A to 2B are schematic diagrams of the digital output unit 240 of the LDTS 200. FIG. 2A is an output signal generation stage 240a for receiving control data from the main control unit 230 and generating an output signal. 2B illustrates an output signal amplifying stage 240b for amplifying an output signal in order to transmit the control signal generated at the output signal generating stage to the field signal interworking device 210. Referring to the figure, the digital output unit 240 is configured as shift registers REG 1 to REG N of N 8-bit outputs, and has an output of 8 x N bits.

As the shift registers REG 1 to REG N, a general shift register 74HC595 is used, and the output terminals OUT 1 to OUT 8 of the shift register each generate a low level output having a predetermined period. The main controller 230 activates the OE (OUTPUT ENABLE) terminal and outputs control data of the field signal facility 300 of the main control unit 230 inputted to the SER (SERIAL DATA input terminal) terminal. 1 to OUT 8).

In addition, the main control unit 230 inputs the control data to the SER terminal of the REG 1 in a serial manner, and is input while the control data is shifted to the next REG 2 through the QH terminal of the REG 1, the last REG One unit of control data transmitted from the main control unit 230 through the QH terminal of N is input to the main control unit 230 again, and the main control unit 230 transmits one unit of data to the digital output unit 240. When control data is compared with control data re-input from the shift registers REG 1 to REG N and the data match, the OE terminals of the respective shift registers are activated to control data buffered in the REG 1 to REG N. Is transmitted to the output signal amplifier shown in Fig. 2b through the output terminals OUTPUT 1 to OUTPUT N.

The output signal amplifier 240b is connected to each of the output terminals OUTPUT 1 to OUTPUT N of the shift registers REG 1 to REG N. The output signal amplifier 240b is configured as a total of N pieces. Only one amplification stage of the output signal amplifier 240b is shown.

The low level control signal outputted from the output terminal of the shift register activates the photocoupler U1 and makes the output terminal P1 of the photocoupler U1 high to set the high level of the power amplifier U2. The input terminal P2 is activated and a signal of the amplified control data is output through the output terminal P3 of the activated power amplifier U2. The output control data is transmitted to the field equipment interlocking device 210 to be electrically connected. The signal is converted into a signal, and the converted electrical signal is transmitted to the field signal facility 300 so that the signal is controlled.

However, the conventional digital output unit 240 of the LDTS 200 has the following problems, and the photocoupler U1 of the output signal amplifying terminal 240b of the conventional digital output unit 240 or the like. The output signal is not generated when the power amplifier U2 is burned out and is open. In particular, when the power amplifier U2 is broken or shorted, the input voltage V in As it is output as it is, there is a fear that the field signal facility 300 malfunctions, giving an electric shock to the field facility interlock device 210, the device itself may be lost.

The present invention is designed to solve the above problems, and detects a failure of the photocoupler or power amplifier of the output signal amplifying stage of the digital output unit of the LDTS, and when an error is found by the detection, the error signal The present invention provides a digital output malfunction prevention circuit of a local data transmission system that transmits a signal to a controller of a digital output unit so that an operator of the LDTS can recognize a failure of a device.

1 is a configuration diagram of a general LDTS,

2 is a configuration diagram of a conventional digital output unit of the LDTS.

2A is a configuration diagram of an output signal generator, FIG. 2B is a configuration diagram of an output signal amplifier,

3 is a circuit diagram of the present invention malfunction prevention circuit.

The constitution of the present invention for achieving the above object,

A first photocoupler U1 inputted with control data from a main control unit 230 of a conventional local data transmission system and activated by respective output signals generated through shift registers REG 1 to REG N, In the digital output unit 240 consisting of a power amplifier U2 having an input terminal P2 connected to an output terminal P1 of the photocoupler U1, the signal of the input terminal P0 of the photocoupler U1 A signal of the output terminal P4 of the second photocoupler U3 activated by the signal of the output terminal P3 of the power amplifier; Characterized in that the input value of the output terminal (P5) of the comparator (U4) is input to the main control unit 230.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a circuit diagram of the present invention malfunction prevention circuit. Referring to the drawings the configuration of the malfunction prevention circuit of the present invention,

2A through the shift registers REG 1 to REG N of the output signal generator 240a that receives the control data from the main controller 230 in the LDTS 200 and generates an output signal. Each generated output signal is input from the input terminal P0 of the first photocoupler U1 to the input terminal B of the comparator U4, and the signal output from the output terminal P1 of the first photocoupler U1 is powered. It is input to the input terminal (P2) of the amplifying device (U2) is configured to activate the power amplifying device (U2), the output signal of the output terminal (P3) of the power amplifying device (U2) to the second photocoupler (U3) It is input to activate the second photocoupler U3, and the signal of the output terminal P4 is input to the input terminal A of the comparator U4.

The result of comparing the values of the input terminal A and the input terminal B of the comparator U4 is output to the output terminal P5 of the comparator, and the result value output to the output terminal P5 of the comparator is the main control unit. A configuration inputted at 230.

On the other hand, according to the embodiment of the present invention, the first photocoupler and the second photocoupler are installed so as not to be interfered with the signal noise from the shift registers REG 1 to REG N, and a conventional circuit noise shielding photocoupler And a power amplifying transistor of a MOSFET type with low power consumption is employed as the power amplifying element. As the comparator, a two-terminal input is used, and a comparator for outputting a high level pulse when the input value is not matched and does not match is adopted.

In addition, the resistors R1, R2, and R3 shown in the drawings are current adjusting resistors corresponding to the applied voltage, and the first and second diodes D1 and D2 are conventional diodes used for rectification.

Hereinafter, the operation of the present invention malfunction prevention circuit configured as described above.

1) When the first photocoupler U1 and the power amplifier U2 are in a normal state

In this case, the power amplifier U2 is activated via the output terminal P1 by the output signal of the shift register input to the first photocoupler U1, and the output terminal of the activated power amplifier U2 ( The signal of P3 is outputted to the final output terminal P7 through the rectifying action of the second diode D2, and this output is input to the second photocoupler U3 via the current adjusting resistor R2. The second photocoupler U3 is activated, and an output signal from the output terminal P4 of the second photocoupler U3 is input to the input terminal A of the comparator U4.

Meanwhile, an output signal of the shift register input to the first photocoupler U1 is simultaneously input to the input terminal B of the comparator U4.

Since the comparator U4 has the same signal input to the input terminal A and the input terminal B, the result value is a low level pulse is output to the comparator output terminal P5, and the result value is input to the main control unit 230. The main controller 230 detects that the elements of the digital output unit 240 are operating normally.

In addition, the signal input to the second photocoupler U3 is output to the final output terminal P7 through the input terminal P6 of the second diode D2.

2) When the power amplifier U2 is disconnected

In this case, the output signal of the shift register input to the first photocoupler U1 is simultaneously input to the input terminal B of the comparator U4, but since the power amplifier U2 is disconnected, the first photocoupler U1 Since the power amplifier U2 is not activated by the signal output to the output terminal P1 of the power amplifier), the output terminal P4 of the second photocoupler U3 becomes low level and is input to the input terminal A of the comparator U4. The resultant value of the output terminal P5 of the comparator U4 becomes a high level and is input to the main control unit 230. The main control unit 230 is abnormally operating in the elements of the digital output unit 240. This is detected, the operator of the command signal equipment 100 operating the LDTS 200 is displayed on the operation terminal or notified of the abnormality through the lamp or sound equipment.

3) When the power amplifier U2 is shorted

In this case, since the power amplifier U2 is in a short circuit state, the input voltage V in input to the power amplifier U2 is output to the final output terminal P7 as it is, so that the comparison value in the comparator U4 is main. Input to the control unit 230, the main control unit 230 detects that the elements of the digital output unit 240 is operating abnormally.

As described above, the configuration of the preferred embodiment of the present invention has been described in detail with reference to the accompanying drawings, which are only for explaining the embodiment, various modifications by those skilled in the art without departing from the description of the claims of the present invention It is obvious that the implementation is possible.

The effect of the present invention configured as described above has the effect of improving the safety of the train by improving the stability of the output signal of the local data transmission system for controlling the field signal equipment for the train operation.

In addition, the present invention malfunction prevention circuit transmits the failure of the field signal equipment to the command signal equipment through the main control unit of the LDTS, so that the operator of the central command signal equipment can systematically and intensively manage the field signal equipment on the train track. There is a possible effect.

In addition, by eliminating the electric shock of the field signal interlock caused by the failure of the digital output of the LDTS, there is an effect of extending the life of the equipment.

In addition, since the malfunction prevention circuit of the present invention is designed to interface directly to the digital output of the LDTS, it is a very advanced design that has the effect of enabling immediate maintenance of the field signal equipment in the field.

Claims (2)

A first photocoupler U1 inputted with control data from a main control unit 230 of a conventional local data transmission system and activated by respective output signals generated through shift registers REG 1 to REG N, In the digital output unit 240 consisting of a power amplifier U2 connected to the input terminal P2 of the output terminal P1 of the photocoupler (U1), A signal of the input terminal P0 of the photocoupler U1, The result value of the output terminal P6 of the comparator U4 to which the signal of the output terminal P5 of the second photocoupler U3 activated by the signal of the output terminal P4 of the power amplifying device U2 is inputted is the main Digital output unit malfunction prevention circuit used in the local data transmission system, characterized in that the input to the control unit (230). The method of claim 1, The power amplifier (U2) is a digital output unit malfunction prevention circuit for local data transmission system, characterized in that the MOSFET type power amplification transistor.