Redundant signal output circuit structure for subway

Abstract

The utility model relates to a redundant signal output circuit structure for a subway, which comprises an upper host, a first lower slave, a second lower slave and a two-way relay, and the output end of the upper host is respectively connected with the input end of the first lower slave and the input end of the second lower slave. The output end of the first lower slave and the output end of the second lower slave are connected with the two input ends of the two-way relay respectively, each of the first lower slave and the second lower slave comprises an MCU, an external IO signal input circuit, a signal input detection circuit, a signal output control circuit and a crystal oscillator circuit, and the external IO signal input circuit, the signal input detection circuit, the signal output control circuit and the crystal oscillator circuit are connected with the two input ends of the two-way relay respectively. The signal output control circuit and the crystal oscillator circuit are electrically connected to the MCU. Due to the double-slave design, when the first lower slave or the second lower slave breaks down, the first lower slave and the second lower slave of the other path can effectively control opening and closing of the double-path relay, the use of the final access control system is not affected, and the operation safety of the subway is integrally enhanced and guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to a communication circuit technical field for subway, in particular to a redundant signal output circuit structure for subway. BACKGROUND

[0002] In order to ensure the safe operation of urban rail transit, more and more urban rail transit lines are installed with platform doors. The platform door system is installed on the side edge of the subway platform close to the track, which separates the platform area and the track area from each other, with the purpose of preventing passengers from falling into the track area and causing accidents, reducing the impact of train operation noise and piston wind on station equipment and facilities and passengers, providing a safe and comfortable waiting environment for passengers, and improving the service level of the subway. At present, the platform door system is automatically controlled by using a single system subway communication circuit structure. According to the subway safety needs of customers, the communication control system needs to be designed for redundancy backup to meet the use requirements of the customer subway operation specification, so it needs to be improved. UTILITY MODEL CONTENTS

[0003] Therefore, it is necessary to provide a redundant signal output circuit structure for subway in view of the above problems.

[0004] A redundant signal output circuit structure for subway, comprising an upper host, a first lower slave, a second lower slave and a double-way relay, wherein the output end of the upper host is connected with the input end of the first lower slave and the second lower slave respectively, the output end of the first lower slave and the second lower slave is connected with the two-way input end of the double-way relay respectively, the first lower slave and the second lower slave each comprises an MCU, an external IO signal input circuit, a signal input detection circuit, a signal output control circuit and a crystal oscillator circuit, and the external IO signal input circuit, the signal input detection circuit, the signal output control circuit and the crystal oscillator circuit are electrically connected to the MCU.

[0005] Preferably, the external IO signal input circuit comprises an optical coupler D23, resistors R45, R46 and R54, the 1 pin of the optical coupler D23 is connected with the PE VCC end, the 2 pin of the optical coupler D23 is connected with the PE IO OUT end through the resistor R45, the 4 pin of the optical coupler D23 is connected with the MCU1 VCC end, the 3 pin of the optical coupler D23 is connected with the resistor R54 and grounded through the resistor R46 and connected with the PE IO4 end.

[0006] Preferably, the signal input detection circuit comprises resistors R37, R44, R51, R58, a ceramic capacitor CP7, a capacitor C42 and an optical coupler D20, the 1st pin of the optical coupler D20 is connected to the IN terminal through the resistor R37, the capacitor C42 and the resistor R44 are connected in parallel between the 1st pin and the 2nd pin of the optical coupler D20, the 2nd pin of the optical coupler D20 is connected to the IN terminal through the ceramic capacitor CP7 and grounded, the 4th pin of the optical coupler D20 is connected to the MCU1 OUT terminal, the 3rd pin of the optical coupler D20 is connected to the IN CH2 terminal through the resistor R51, and the resistor R51 is connected in series with the resistor R58 and grounded.

[0007] Preferably, the signal output control circuit comprises an optical coupler D18, a thermistor F11 and a resistor R39, the 1st pin of the optical coupler D18 is connected to the MCU1 OUT terminal, the 2nd pin of the optical coupler D18 is connected to the OUT CH1 terminal through the resistor R39, the 3rd pin of the optical coupler D18 is connected to the OUT- terminal, and the 4th pin of the optical coupler D18 is connected to the OUT+ terminal through the thermistor F11.

[0008] Preferably, the model of the MCU is STM32F405RG-LQFP64, the model of the optical coupler D23 is TLP187, the model of the optical coupler D20 is TLP187, the model of the optical coupler D18 is LT219-1, and the model of the double-way relay is TXAS1-3012g.

[0009] The metro redundant signal output circuit structure module has the advantages that: the double-slave system design enables the first lower slave or the second lower slave to effectively control the opening and closing of the double-way relay when the first lower slave or the second lower slave fails, and does not affect the use of the final access control system, thereby enhancing and guaranteeing the operation safety of the metro as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is a metro redundant signal output circuit structure module schematic diagram for one embodiment;

[0011] Figure 2 It is a MCU and crystal circuit schematic diagram;

[0012] Figure 3 It is an external IO signal input circuit schematic diagram;

[0013] Figure 4 It is a signal input detection circuit schematic diagram;

[0014] Figure 5 It is a signal output control circuit schematic diagram. DETAILED DESCRIPTION

[0015] To make the above objectives, features and advantages of the present application more apparent, a detailed description of the specific embodiments of the present application will be given below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific details set forth herein without departing from the scope of the present application. It is therefore contemplated that the present application covers all modifications of the present application falling within the scope of the present application.

[0016] It is noted that when an element is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or intervening elements can be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element, or intervening elements can be present. The terms "vertical", "horizontal", "left", "right", and the like as used herein are used for illustration only and are not intended to limit the present application.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0018] As Figures 1-5As shown, a redundant signal output circuit structure for subway includes a host computer 100, a first slave computer 200, a second slave computer 300 and a double relay 400. The output end of the host computer 100 is connected with the input end of the first slave computer 200 and the second slave computer 300 respectively. The output end of the first slave computer 200 and the second slave computer 300 is connected with the two-way input end of the double relay 400 respectively. The first slave computer 200 and the second slave computer 300 both include MCU1, external IO signal input circuit 2, signal input detection circuit 3, signal output control circuit 4 and crystal oscillator circuit 5. The external IO signal input circuit 2, the signal input detection circuit 3, the signal output control circuit 4 and the crystal oscillator circuit 5 are electrically connected to the MCU1. Specifically, in the embodiment, the host computer 100 is the total control. In order to realize the redundant backup design of the subway system, we design the parallel first slave computer 200 and the second slave computer 300. The first slave computer 200 and the second slave computer 300 are under the control of the host computer 100 and run synchronously to control the opening and closing of the double relay 400, thereby completing the opening and closing of the subway door. The double system design makes the first slave computer 200 or the second slave computer 300 fail, and the other first slave computer 200 and the second slave computer 300 can effectively control the opening and closing of the double relay 400, without affecting the use of the final access control system, thereby enhancing and ensuring the safety of the subway operation. The crystal oscillator circuit 5 is integrated in the periphery of the MCU1 to provide accurate clock signals for the same MCU and other circuit working rhythm. Meanwhile, there is a reset circuit which can be used to repair system failure and realize fault self-healing. The MCU1 is connected with switches and various sensor signals through the signal input detection circuit 3. The signal input detection circuit 3 can safely and reliably deliver the signals of the sensors, switches and other electronic components set in the subway system to the MCU1. Because the working voltage of the MCU1 is low, the external signal is usually high voltage or noise, and direct input to the MCU1 will affect its safe use, so the signal input detection circuit 3 is needed for isolation protection. The external IO signal input circuit 2 is the signal communication channel of the MCU1 and other external devices, which can convert the communication signals of external devices into digital signals recognizable by the MCU1, while protecting the safe use of the MCU1. The signal output control circuit 4 is used to safely deliver the digital signals of the MCU1, realize high-voltage isolation and driving, and convert the weak current signal (mA level) of the MCU1 into a strong current signal that can drive high-power devices.

[0019] As Figure 3As shown, the external IO signal input circuit 2 includes an optical coupler D23, resistors R45, R46 and R54, the 1st pin of the optical coupler D23 is connected to the PE VCC terminal, the 2nd pin of the optical coupler D23 is connected to the PE IO OUT terminal through the resistor R45, the 4th pin of the optical coupler D23 is connected to the MCU1 VCC terminal, the 3rd pin of the optical coupler D23 is connected to the resistor R54 which is grounded and connected to the PE IO4 terminal through the resistor R46. Specifically, in this embodiment, the optical coupler D23 is used to realize signal isolation and enhance anti-interference capability, the resistor R45 is used as a current limiter, the resistor R46 connected to the 3rd pin of the optical coupler D23 is also used for current limiting protection to enhance signal stability, and the "optical signal" of the optical coupler D23 is converted into a "voltage signal" for subsequent circuit reading. The resistor R54 grounded can suppress temperature drift and device parameter discreteness through negative feedback to improve circuit stability.

[0020] As shown in the figure, Figure 4 The signal input detection circuit 3 includes resistors R37, R44, R51 and R58, a ceramic capacitor CP7, a capacitor C42 and an optical coupler D20. The 1st pin of the optical coupler D20 is connected to the IN terminal through the resistor R37, the capacitor C42 and the resistor R44 are connected in parallel between the 1st pin and the 2nd pin of the optical coupler D20, the 2nd pin of the optical coupler D20 is connected to the IN terminal through the ceramic capacitor CP7 and grounded, the 4th pin of the optical coupler D20 is connected to the MCU1 OUT terminal, the 3rd pin of the optical coupler D20 is connected to the IN CH2 terminal through the resistor R51, and the resistor R51 is connected in series with the resistor R58 and grounded. Specifically, the resistor R37 is used as a current limiting resistor, the input electrical signal is isolated by the optical coupler D20 to avoid interference signals affecting the MCU1, and the current is physically isolated to prevent noise generated by the motor, relay and other devices from affecting the MCU1. The resistor R44 and the capacitor C42 are connected in parallel for filtering to filter out high-frequency noise. The resistor 51 connected to the 3rd pin of the optical coupler 20 is used as a current limiting resistor to protect the corresponding pin of the MCU1.

[0021] As shown in the figure, Figure 5 The signal output control circuit 4 includes an optical coupler D18, a thermistor F11 and a resistor R39. The 1st pin of the optical coupler D18 is connected to the MCU1 OUT terminal, the 2nd pin of the optical coupler D18 is connected to the OUT CH1 terminal through the resistor R39, the 3rd pin of the optical coupler D18 is connected to the OUT- terminal, and the 4th pin of the optical coupler D18 is connected to the OUT+ terminal through the thermistor F11. Specifically, the resistor R39 is used as a current limiting resistor to limit the current input to the optical coupler D18 not to exceed a threshold value, and the thermistor F11 connected to the 4th pin of the optical coupler D18 can be used as an over-temperature protection.

[0022] Specifically, the model of the MCU1 is STM32F405RG-LQFP64, the model of the optical coupler D23 is TLP187, the model of the optical coupler D20 is TLP187, the model of the optical coupler D18 is LT219-1, and the model of the double-channel relay 400 is TXAS1-3012g.

[0023] The above embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the utility model concept, several modifications and improvements can be made, which belong to the protection range of the utility model. Therefore, the protection range of the utility model patent should be subject to the appended claims.

Claims

1. A redundant signal output circuit structure for subway use, characterized in that: The system includes a host computer, a first slave device, a second slave device, and a dual-channel relay. The output of the host computer is connected to the input of the first and second slave devices, respectively. The output of the first and second slave devices is connected to the two inputs of the dual-channel relay, respectively. Each of the first and second slave devices includes an MCU, an external I / O signal input circuit, a signal input detection circuit, a signal output control circuit, and a crystal oscillator circuit. The external I / O signal input circuit, signal input detection circuit, signal output control circuit, and crystal oscillator circuit are all electrically connected to the MCU.

2. The redundant signal output circuit structure for subways as described in claim 1, characterized in that: The external IO signal input circuit includes optocoupler D23, resistors R45, R46 and R54. Pin 1 of optocoupler D23 is connected to the PE VCC terminal, pin 2 of optocoupler D23 is connected to the PE IO OUT terminal through resistor R45, pin 4 of optocoupler D23 is connected to the MCU1 VCC terminal, and pin 3 of optocoupler D23 is connected to ground through resistor R54 and connected to the PE IO4 terminal through resistor R46.

3. The redundant signal output circuit structure for subways as described in claim 2, characterized in that: The signal input detection circuit includes resistors R37, R44, R51, and R58, ceramic capacitor CP7, capacitor C42, and optocoupler D20. Pin 1 of optocoupler D20 is connected to the IN terminal through resistor R37. Capacitor C42 and resistor R44 are connected in parallel between pins 1 and 2 of optocoupler D20. Pin 2 of optocoupler D20 is connected to the IN terminal through ceramic capacitor CP7 and grounded. Pin 4 of optocoupler D20 is connected to the OUT terminal of MCU1. Pin 3 of optocoupler D20 is connected to the IN CH2 terminal through resistor R51. Resistors R51 and R58 are connected in series and then grounded.

4. The redundant signal output circuit structure for subways as described in claim 3, characterized in that: The signal output control circuit includes an optocoupler D18, a thermistor F11, and a resistor R39. Pin 1 of the optocoupler D18 is connected to the OUT terminal of MCU1, pin 2 of the optocoupler D18 is connected to the OUT CH1 terminal through the resistor R39, pin 3 of the optocoupler D18 is connected to the OUT- terminal, and pin 4 of the optocoupler D18 is connected to the OUT+ terminal through the thermistor F11.

5. The redundant signal output circuit structure for subways as described in claim 4, characterized in that: The MCU is model STM32F405RG-LQFP64, the optocoupler D23 is model TLP187, the optocoupler D20 is model TLP187, the optocoupler D18 is model LT219-1, and the dual-channel relay is model TXAS1-3012g.

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