Power supply restart circuit for rail transit

Abstract

The utility model discloses a power supply restart circuit for rail transit, and aims to solve the problem of poor stability of a conventional power supply system. The circuit is composed of an EN555 chip, an optocoupler, a resistor, a capacitor and a triode, the trigger end of the EN555 chip is controlled through I / O signals, and the functions of power supply recovery and abnormal automatic restart are achieved through charging and discharging of the capacitor. Compared with a traditional single-chip microcomputer scheme, the circuit has the advantages of being simple in structure, low in cost and high in stability, is suitable for rail transit equipment, and meets efficient and reliable power supply requirements.

Description

Technical Field

[0001] This utility model relates to the field of power supply control for rail transit equipment, specifically a power supply restart circuit for rail transit equipment, belonging to the professional communication field. Background Technology

[0002] With the continuous development of rail transit technology, the power supply system of wireless locomotive transceivers, as a crucial communication device in rail transit, is becoming increasingly important for equipment operation. In actual rail transit operation, the power supply system needs to operate stably for extended periods in complex and variable environments. However, the power supply control circuits commonly used in existing technologies have certain shortcomings. For example, after a power supply anomaly or short-term interruption, the equipment cannot quickly restore power, leading to operational interruptions or equipment restart failures. This situation may affect the overall stability of the system, reduce the operating efficiency of rail transit equipment, and even potentially cause safety hazards.

[0003] Traditional power supply circuits often lack effective automatic restart mechanisms, relying solely on manual intervention or complex control schemes to reset equipment and restore power, resulting in inconvenient operation and limited stability. Therefore, developing a power supply control circuit capable of rapid response and automatic restart in the event of power failure is crucial. An ideal solution should possess advantages such as simple circuit design, rapid response, low cost, and strong adaptability to meet the high-efficiency and stable power supply requirements of rail transit equipment. Summary of the Invention

[0004] In view of the problems existing in the prior art, this utility model provides a power supply restart circuit for rail transit, which aims to solve the problem that the existing power supply system cannot quickly restore power supply under abnormal conditions, thereby improving the stability and reliability of equipment operation.

[0005] To achieve the above objectives, the technical solution of this utility model is: a power supply restart circuit for rail transit, comprising an EN555 chip N1, an optocoupler N2, resistors R1, R2, R3, R4, and R5, capacitors C1, C2, C3, and C4, and a transistor VT1; the specific connection of the circuit is as follows: the GND pin of the EN555 chip N1 is connected to ground (GND) and one end of capacitor C2; the other end of capacitor C2 is connected to the CONT pin of the EN555 chip N1; the TRIG pin of the EN555 chip N1 is connected to one end of capacitor C3, the collector of transistor VT1, and one end of resistor R3; the other end of capacitor C3 is connected to ground (GND); the other end of resistor R3 is connected to DC-12V, one end of resistor R2, and the EN555 chip... The RESET pin and VDD pin of N1 are connected to one end of capacitor C1, and the other end of capacitor C1 is grounded to GND. The other end of resistor R2 is connected to one end of capacitor C4 and the THRES and DISCH pins of EN555 chip N1, respectively. The other end of capacitor C4 is grounded to GND. The emitter of transistor VT1 is grounded, and the base of transistor VT1 is connected to one end of resistor R4. The other end of resistor R4 is connected to one end of resistor R5 and the I / O_POWER_RESET signal terminal, respectively. The other end of resistor R5 is grounded to GND. The OUT pin of EN555 chip N1 is connected to one end of resistor R1, and the other end of resistor R1 is connected to pin 1 of optocoupler N2. Pins 2 and 3 of optocoupler N2 are grounded to GND, and pin 4 of optocoupler N2 is connected to the POWER_RESET signal terminal.

[0006] The technical advantages of this invention are: by using basic electronic components (such as EN555 chips, optocouplers, resistors, capacitors, and transistors) to control the circuit, it avoids reliance on complex microcontrollers, thereby improving system stability and reliability. Compared with the traditional method of using a microcontroller to control the power reset signal without power loss, this solution has a simpler structure, more intuitive circuit design, reduced complexity, and lower costs. Furthermore, the circuit has automatic power-down and power-up capabilities, enabling automatic restart in case of equipment malfunction, achieving self-recovery and ensuring continuous stable operation of the equipment, meeting the high reliability requirements of rail transit equipment. This design not only improves system stability and reliability but also optimizes cost-effectiveness, making it particularly suitable for applications with high power supply stability requirements. Attached Figure Description

[0007] Figure 1 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0008] like Figure 1As shown, a power supply restart circuit for rail transit includes an EN555 chip N1, an optocoupler N2, resistors R1, R2, R3, R4, and R5, capacitors C1, C2, C3, and C4, and a transistor VT1.

[0009] The specific circuit connection is as follows: the GND pin (pin 1) of the EN555 chip N1 is connected to ground GND and one end of capacitor C2. The other end of capacitor C2 is connected to the CONT pin (pin 5) of the EN555 chip N1. The TRIG pin (pin 2) of the EN555 chip N1 is connected to one end of capacitor C3, the collector (pin 3) of transistor VT1, and one end of resistor R3. The other end of capacitor C3 is connected to ground GND. The other end of resistor R3 is connected to DC_12V, one end of resistor R2, the RESET pin (pin 4) and VDD pin (pin 8) of the EN555 chip N1, and one end of capacitor C1. The other end of capacitor C1 is connected to ground GND. The other end of resistor R2 is connected to... One end of capacitor C4 is connected to the THRES pin (pin 6) and DISCH pin (pin 7) of EN555 chip N1, and the other end of capacitor C4 is grounded to GND; the emitter (pin 2) of transistor VT1 is grounded, the base (pin 1) of transistor VT1 is connected to one end of resistor R4, the other end of resistor R4 is connected to one end of resistor R5 and the I / O_POWER_RESET signal terminal, and the other end of resistor R5 is grounded to GND; the OUT pin (pin 3) of EN555 chip N1 is connected to one end of resistor R1, the other end of resistor R1 is connected to pin 1 of optocoupler N2, pins 2 and 3 of optocoupler N2 are grounded to GND, and pin 4 of optocoupler N2 is connected to the POWER_RESET signal terminal.

[0010] The EN555 is a general-purpose timer chip widely used in pulse generation, timing control, and oscillation circuits. It is typically packaged in an 8-pin package, with the following pin functions: GND is the chip's ground pin, connected to system ground; TRIG is the trigger pin, used to start timing with a low-level trigger signal; OUT is the output pin, which can output high or low level signals; RESET is the reset pin, used to reset the chip with a low-level signal; CONT is the control pin, used to adjust the internal reference voltage for PWM control; THRES is the threshold pin, used to detect the voltage threshold at which timing is completed; DISCH is the discharge pin, used to control the discharge path of the external capacitor; and VCC is the chip's power supply voltage pin, typically operating at +5V or +12V. The EN555 features a simple structure, low cost, and flexible application, making it suitable for various scenarios such as signal modulation, PWM control, and automatic reset. It is widely used in industrial, communication, and consumer electronics fields.

[0011] The specific working process of this utility model is as follows:

[0012] Initial state: The I / O_POWER_RESET signal is high, transistor VT1 is off; the TRIG pin (pin 2) of the EN555 chip is high, and the OUT pin (pin 3) is low; optocoupler N2 is not conducting, and the POWER_RESET signal is invalid.

[0013] Reset Trigger: When the I / O_POWER_RESET signal is pulled low (e.g., when a power supply abnormality occurs), transistor VT1 is turned on, and the TRIG pin (pin 2) of the EN555 chip is pulled low; the low TRIG pin (pin 2) triggers the EN555 chip to start timing, and the OUT pin (pin 3) outputs a high level; the high level signal drives the optocoupler N2 through resistor R1, making it turn on, thereby outputting a valid POWER_RESET signal.

[0014] Delayed reset: As capacitor C3 charges through R3, the voltage of the TRIG pin (pin 2) gradually increases; when C3 is fully charged, the TRIG pin returns to a high level, the EN555 chip stops timing, and the OUT pin (pin 3) outputs a low level; optocoupler N2 is turned off, and the reset signal ends.

[0015] Automatic recovery: If the I / O_POWER_RESET signal changes again, the circuit can repeat the above process to achieve automatic restart.

[0016] The wireless locomotive radio serves as the medium for communication between the driver and the dispatcher, and is also a crucial tool for train drivers to request orders in emergencies. Applying the circuit of this invention to the wireless locomotive radio circuitry enables rapid response and quick restart, ensuring stable equipment operation.

Claims

1. A power supply restart circuit for rail transit, comprising an EN555 chip N1, an optocoupler N2, resistors R1, R2, R3, R4, and R5, capacitors C1, C2, C3, and C4, and a transistor VT1; characterized in that, The specific circuit connection is as follows: the GND pin of the EN555 chip N1 is connected to ground (GND) and one end of capacitor C2. The other end of capacitor C2 is connected to the CONT pin of the EN555 chip N1. The TRIG pin of the EN555 chip N1 is connected to one end of capacitor C3, the collector of transistor VT1, and one end of resistor R3. The other end of capacitor C3 is connected to ground (GND). The other end of resistor R3 is connected to DC_12V, one end of resistor R2, the RESET pin and VDD pin of the EN555 chip N1, and one end of capacitor C1. The other end of capacitor C1 is connected to ground (GND). The other end of resistor R2 is connected to... One end of capacitor C4 is connected to the THRES and DISCH pins of EN555 chip N1, and the other end of capacitor C4 is grounded to GND; the emitter of transistor VT1 is grounded, the base of transistor VT1 is connected to one end of resistor R4, the other end of resistor R4 is connected to one end of resistor R5 and the I / O_POWER_RESET signal terminal, and the other end of resistor R5 is grounded to GND; the OUT pin of EN555 chip N1 is connected to one end of resistor R1, the other end of resistor R1 is connected to pin 1 of optocoupler N2, pins 2 and 3 of optocoupler N2 are grounded to GND, and pin 4 of optocoupler N2 is connected to the POWER_RESET signal terminal.

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