A 25hz power module all-station phase control unit

Abstract

The utility model discloses a kind of 25Hz power module total station same-phase control unit, including four 25Hz power modules, it is characterized by: each the 25Hz power module inside is integrated with master-slave control circuit and reference synchronous circuit;The master-slave control circuit of four 25Hz power modules is connected with each other by four master-slave control signal lines, constitutes master-slave logic judgment network, for realizing the automatic election and fault switching of one host computer, three slaves;The reference synchronous circuit of four 25Hz power modules is connected with each other by a reference synchronous signal line, constitutes phase synchronization network, for host computer to all slaves transmission reference synchronous signal, make the output voltage phase of all slaves and host computer keep consistent.The utility model can ensure that all 25Hz power module output same-phase 25Hz power supply.

Description

Technical Field

[0001] This utility model relates to the field of railway signal power supply technology, specifically to a 25Hz power module station-wide phase control unit. Background Technology

[0002] In railway signaling power systems, the 25Hz power supply is often grouped into uplink and downlink groups. Currently, these grouped power modules operate independently, resulting in a random phase of their output 25Hz voltage. This fails to meet the on-site requirement of maintaining phase consistency between the uplink and downlink track power supply voltages. This phase inconsistency can cause signal interference and affect train operation safety. Therefore, there is an urgent need for a control scheme that can ensure that all 25Hz power modules in the entire station output the same phase. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a 25Hz power module full-station in-phase control unit, which can ensure that all 25Hz power modules output 25Hz power in the same phase.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0005] A 25Hz power module full-station phase-coordinated control unit includes four 25Hz power modules. The key feature is that each 25Hz power module integrates a master-slave control circuit and a reference synchronization circuit. The master-slave control circuits of the four 25Hz power modules are interconnected via four master-slave control signal lines to form a master-slave logic judgment network, used to achieve automatic election and fault switching of one master and three slave units. The reference synchronization circuits of the four 25Hz power modules are interconnected via a reference synchronization signal line to form a phase synchronization network, used by the master to transmit a reference synchronization signal to all slave units, ensuring that the output voltage phase of all slave units is consistent with that of the master.

[0006] Preferably, the master-slave control circuit includes a logic judgment chip, a filtering network, and a status output driving circuit; multiple input terminals of the logic judgment chip of this 25Hz power module are respectively connected to the master-slave control signal lines corresponding to other 25Hz power modules through the filtering network, for listening to the status of other 25Hz power modules; the output terminal of the logic judgment chip is connected to the status output driving circuit; the status output driving circuit outputs a local master-slave status signal to the reference synchronization circuit, and controls the output level of the master-slave control signal line corresponding to this 25Hz power module.

[0007] Preferably, the master-slave control signal line is a bidirectional signal line; for any 25Hz power module, its corresponding master-slave control signal line serves as both an output line, driven by the master-slave control circuit to announce the local status, and an input line, for other 25Hz power modules to listen to.

[0008] Preferably, the reference synchronization circuit includes a microcontroller and a signal isolation driving unit; the microcontroller receives the local master-slave status signal; when the local machine is the master, the microcontroller generates a reference synchronization signal according to its internal clock, which is amplified by the signal isolation driving unit and drives the reference synchronization signal line. At the same time, the microcontroller generates a low-frequency driving signal in phase with the reference synchronization signal; when the local machine is the slave, the microcontroller listens to the signal on the reference synchronization signal line through the signal isolation driving unit and adjusts the internal phase to synchronize the low-frequency driving signal output by the local machine with the master.

[0009] Preferably, the signal isolation driving unit includes a unidirectional isolation diode to prevent signal reverse interference.

[0010] The technological advancements achieved by this utility model are as follows, due to the adoption of the above technical solutions.

[0011] This invention achieves master-slave competition through pure hardware circuitry, resulting in fast and reliable operation; it achieves full-station phase synchronization through a single reference synchronization signal line, resulting in a simple structure and high precision; and the failure of any 25Hz power supply module does not affect the system's synchronization function, demonstrating high redundancy and reliability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the system wiring of this utility model; Figure 2 This is a circuit diagram of the master-slave control circuit of this utility model; Figure 3 This is a circuit diagram of the reference synchronization circuit of this utility model. Detailed Implementation

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0014] A 25Hz power module full-station in-phase control unit, combined with Figure 1 As shown, it includes four identical 25Hz power modules (modules 1 to 4), with each pair of 25Hz power modules forming a group, which can be divided into group A (uplink) and group B (downlink). Each 25Hz power module integrates a master-slave control circuit (corresponding to...). Figure 2 ) and reference synchronization circuit (corresponding to Figure 3 ).

[0015] The overall connection relationships are as follows: The master-slave control circuits of the four 25Hz power modules are interconnected through four master-slave control signal lines (MS1, MS2, MS3, MS4). Specifically, the MS1 port of module 1, the MS2 port of module 2, the MS3 port of module 3, and the MS4 port of module 4 are all connected together to form a master-slave logic network. This network enables automatic election and fault switching of one master and three slave modules. Each master-slave control signal line represents the master status of the corresponding 25Hz power module (e.g., MS1 high indicates that module 1 is the master). The master-slave control signal lines are bidirectional; for any 25Hz power module, its corresponding master-slave control signal line serves both as an output line, driven by the master-slave control circuit to announce its status, and as an input line for other 25Hz power modules to listen to.

[0016] The reference synchronization circuits of the four 25Hz power modules are interconnected through a reference synchronization signal line. That is, the SYNC ports of the four 25Hz power modules are all connected together to form a common reference synchronization signal line, thereby forming a phase synchronization network. This network is used by the master to transmit the reference synchronization signal to all slaves, so that the output voltage phase of all slaves is consistent with that of the master.

[0017] like Figure 2 The diagram shown is a circuit diagram of a master-slave control circuit. Its core function is to determine and output the master-slave status of the local machine.

[0018] Components: The logic judgment chip IC32C is a three-input NOR gate chip.

[0019] The filter network consists of resistors (R118, R91, R96, R119, R99 and R126) and capacitors (C81, C5 and C83), connected to the MS2, MS3 and MS4 signal input terminals to filter out noise and improve stability.

[0020] Status output drive circuit: includes transistor D6, resistors (R132 and R123) and status indicator LED5.

[0021] Connection relationships and working principles: The three input terminals (pins 11, 12 and 13) of the logic judgment chip IC32C are connected to the master-slave control signal lines (i.e. MS2, MS3 and MS4) of the other three 25Hz power modules through the aforementioned filter network, respectively, to listen to the status of the other 25Hz power modules.

[0022] The output pin 10 of the logic judgment chip IC32C is connected to the base of the transistor D6 in the status output driver circuit.

[0023] The status output drive circuit outputs a local master-slave status signal (i.e., the collector level of transistor D6) to the reference synchronization circuit and controls the output level of the master-slave control signal line corresponding to this 25Hz power supply module.

[0024] Master-slave control circuit operation process: Host election process: After the 25Hz power module is powered on, its logic chip detects the levels of lines MS2, MS3, and MS4. If all three are low (indicating there is no host in the network), the NOR gate outputs a high level, turning on transistor D6. The conduction of transistor D6 leads to: When the collector of transistor D6 goes low, this low-level signal is sent to the local reference synchronization circuit, indicating that "this machine should act as the master".

[0025] The status indicator LED5 changes its related circuit status (lights up or off depending on the specific connection method).

[0026] At the same time, the local circuit drives the master-slave control signal line corresponding to this 25Hz power module (such as the MS1 line of module 1) to a high level, announcing to the network that "this machine is the master".

[0027] Slave setup process: If any of MS2, MS3, or MS4 is detected to be high (indicating a host already exists on the network), the NOR gate outputs a low level, and transistor D6 is cut off. This results in: The collector of transistor D6 is pulled up to a high level through pull-up resistor R123. This high-level signal is sent to the reference synchronization circuit to indicate that "this machine should act as a slave".

[0028] The status of the relevant circuit of status indicator LED5 changes accordingly.

[0029] The master-slave control signal line corresponding to this 25Hz power module remains at a low level (not acting as a master).

[0030] like Figure 3 The diagram shown is a circuit diagram of a reference synchronization circuit, the core of which is a microcontroller U1.

[0031] Components: Microcontroller U1: The core of intelligent control.

[0032] Signal isolation drive unit: includes unidirectional isolation diode D24, current limiting resistor R28, filter capacitor C78 and drive transistor TR1 (specifically TR1-W-AT16).

[0033] Connection relationships and working principles: One GPIO pin of the microcontroller U1 handles the internal reference signal MS16 / 64. This pin is connected to the base of the driver transistor TR1 via a unidirectional isolation diode D24 and an RC network (R28, C78). The unidirectional isolation diode is used to prevent reverse signal interference. The collector of TR1 outputs two paths: one is sent as the reference synchronization signal SYNC to the external reference synchronization signal line; the other is sent as the low-frequency drive signal STDW-LF to the internal power amplifier circuit to generate a 220V / 110V 25Hz power supply capable of driving the track circuit.

[0034] The microcontroller receives the local master-slave status signal from the master-slave control circuit (i.e., Figure 2 The voltage level signal at the collector of transistor D6.

[0035] Synchronization process: Master Mode: When the microcontroller determines that the device is the master (i.e., receives the master status signal), it starts its internal timer and independently generates a high-precision 25Hz square wave signal MS16 / 64. After being driven, this signal serves two purposes: firstly, as the STDW-LF signal to drive the device, and secondly, as the SYNC signal broadcast to the reference synchronization signal line, providing a phase reference for the entire station.

[0036] Slave Mode: When the microcontroller determines that the device is a slave (i.e., receives a slave status signal), it sets the aforementioned GPIO pins to input mode and enables input capture. It precisely listens to the signal edges on the reference synchronization signal line and dynamically adjusts the phase of its internal timer through a phase-locked loop algorithm to ensure that the STDW-LF signal it generates is strictly synchronized with the SYNC signal sent by the host.

[0037] In operation, after power-on, the four 25Hz power modules automatically compete to elect a master unit through a master-slave logic network. The master unit continuously sends a synchronization signal through a phase synchronization network. All slave units track this signal synchronously. If the master unit fails, its announcement line goes low. The remaining slave units detect this change and immediately initiate a new round of competition to elect a new master unit. The system resumes synchronous operation without interruption.

Claims

1. A 25Hz power module whole-station in-phase control unit, comprising four 25Hz power modules, characterized in that: Each of the 25Hz power modules integrates a master-slave control circuit and a reference synchronization circuit. The master-slave control circuits of the four 25Hz power modules are interconnected through four master-slave control signal lines to form a master-slave logic judgment network, which is used to realize the automatic election and fault switching of one master and three slaves. The reference synchronization circuits of the four 25Hz power modules are interconnected through one reference synchronization signal line to form a phase synchronization network, which is used by the master to transmit the reference synchronization signal to all slaves so that the output voltage phase of all slaves is consistent with that of the master.

2. The 25Hz power module full-station in-phase control unit according to claim 1, characterized in that: The master-slave control circuit includes a logic judgment chip, a filtering network, and a status output driving circuit. Multiple input terminals of the logic judgment chip in this 25Hz power module are connected to the master-slave control signal lines corresponding to other 25Hz power modules through the filtering network, for monitoring the status of other 25Hz power modules. The output terminal of the logic judgment chip is connected to the status output driving circuit. The status output driving circuit outputs a local master-slave status signal to the reference synchronization circuit and controls the output level of the master-slave control signal line corresponding to this 25Hz power module.

3. The 25Hz power module full-station in-phase control unit according to claim 2, characterized in that: The master-slave control signal line is a bidirectional signal line; for any 25Hz power module, its corresponding master-slave control signal line serves as both an output line, driven by the master-slave control circuit to announce the local status, and an input line, allowing other 25Hz power modules to listen.

4. A 25Hz power module full-station in-phase control unit according to claim 2, characterized in that: The reference synchronization circuit includes a microcontroller and a signal isolation drive unit. The microcontroller receives the local master / slave status signal. When the local device is the master, the microcontroller generates a reference synchronization signal based on its internal clock. This signal is amplified by the signal isolation drive unit and then drives the reference synchronization signal line. Simultaneously, the microcontroller generates a low-frequency drive signal that is in phase with the reference synchronization signal. When the local device is the slave, the microcontroller listens to the signal on the reference synchronization signal line through the signal isolation drive unit and adjusts the internal phase to synchronize the low-frequency drive signal output by the local device with the master device.

5. A 25Hz power module full-station in-phase control unit according to claim 4, characterized in that: The signal isolation drive unit includes a unidirectional isolation diode to prevent signal reverse interference.

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