A multi-path power supply system

Abstract

The utility model relates to a kind of multi-path power supply system, comprising: at least two-way power input, voltage stabilizing inverter circuit, power output, switching circuit and phase-locked loop;When multi-path power supply system power failure, the switching circuit is switched to bypass power supply by the SST circuit with power supply;The phase-locked loop locks the non-bypass power input phase, before power switching when failure occurs, switching is locked to bypass phase.The multi-path power supply system provided by the utility model uses STS to bypass switching, response time is less than 1MS and does not depend on main module, ensure that when main module failure, it can be switched to bypass power supply quickly, and bypass input phase is locked by phase-locked loop, ensure that there is no phase difference problem when power supply screen switches in rear stage, avoid the impact on load equipment.

Description

Technical Field

[0001] This utility model relates to the field of power supply system technology, specifically a multi-channel power supply system. Background Technology

[0002] The power supply for the signal machinery room is a power supply device specifically designed for railway signaling systems. Its core function is to provide stable and reliable power support to ensure the normal operation of the railway signaling system.

[0003] A signal equipment room typically consists of a power supply panel, UPS (Uninterruptible Power Supply), battery banks, and distribution cabinets, providing AC and DC power of different voltage levels to various signaling equipment such as signals, turnout switches, and track circuits. Therefore, the power supply in a signal equipment room needs to possess high reliability, high stability, high security, and high anti-interference capabilities. Railway signaling equipment has extremely high requirements for power supply stability; any power supply failure may cause malfunctions or shutdowns of the signaling equipment, thereby affecting the safety and normal operation of railway transportation. For example, the lighting circuits of signals and the control circuits of turnout switches all require a stable power supply.

[0004] The existing power supply systems have the following unresolved technical problems: 1. The switching time of the power switching device is too long, which cannot meet the power continuity requirements of signal equipment, potentially causing short-term power outages during power switching. 2. The power supply equipment is susceptible to external electromagnetic interference, such as lightning strikes and electromagnetic radiation from electrical equipment, leading to unstable power output and affecting the normal operation of the signal equipment. Utility Model Content

[0005] This utility model addresses the technical problems existing in the prior art by providing a multi-channel power supply system.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A multi-source power supply system, comprising: It includes at least two power input terminals, a voltage regulator inverter circuit, a power output terminal, a switching circuit, and a phase-locked loop circuit; In this system, the input terminal of each power supply is connected to the input terminal of the voltage-stabilized inverter circuit through its respective connected incoming circuit breaker, the output terminal of the voltage-stabilized inverter circuit is connected to the power supply output terminal, and the switching circuit and the phase-locked loop circuit are connected in parallel to the multi-power supply system. When the multi-power supply system fails, the switching circuit switches the power supply to the bypass power supply through the SST circuit; The phase-locked circuit locks the phase of the non-bypass power input terminal, and switches to the bypass phase before power switching occurs in the event of a fault.

[0007] As a further technical solution, the multi-power supply system also includes: An energy storage interface, wherein the energy storage interface is connected in parallel to the multi-power system; The energy storage interface is connected in series with a DC circuit breaker and a fuse.

[0008] As a further technical solution, the energy storage interface is connected to an external battery, and the voltage and current of the battery are displayed.

[0009] As a further technical solution, the power input terminal converts AC power to DC power through a four-bridge rectifier circuit.

[0010] As a further technical solution, the voltage-regulated inverter circuit includes: Voltage conversion module and inverter module; The power input terminal is connected to the input terminal of the voltage conversion module, the output terminal of the voltage conversion module is connected to the input terminal of the inverter module, and the output terminal of the inverter module is connected to the power output terminal.

[0011] As a further technical solution, the power output terminal includes: Transformers, thyristors, pressure-controlled circuit breakers and output copper busbars; The output terminal of the inverter module is connected to the transformer. After the transformer transforms the voltage, it is connected to the output copper busbar through the thyristor and the voltage-controlled maintenance circuit breaker for output.

[0012] As a further technical solution, in the multi-channel power supply system, the neutral lines connected to the power input terminals of any two channels are isolated from each other.

[0013] As a further technical solution, in the multi-channel power supply system, the neutral wire connected to the power input terminal of any channel is isolated from the neutral wire connected to the power output terminal.

[0014] As a further technical solution, the multi-channel power supply system also includes a reset circuit, which is connected to the switching circuit. When the fault is recovered, the reset circuit controls the switching circuit to reset.

[0015] The multi-channel power supply system provided by this utility model uses STS for bypass switching, with a response time of less than 1ms and no dependence on the main power supply. This ensures that the system can quickly switch to bypass power supply when the main power supply fails. Furthermore, the bypass input phase is locked by a phase-locked loop to ensure that there is no phase difference problem when the downstream power supply panel switches, thus avoiding impact on the load equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the circuit structure of a multi-channel power supply system according to the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0019] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0020] Figure 1 This is a schematic diagram of a multi-channel power supply system circuit according to this utility model, as shown below. Figure 1 As shown, it includes at least two power input terminals, a voltage regulator inverter circuit, a power output terminal, a switching circuit, and a phase-locked loop circuit. In this system, the input terminal of each power supply is connected to the input terminal of the voltage-stabilized inverter circuit through its respective connected incoming circuit breaker, the output terminal of the voltage-stabilized inverter circuit is connected to the power supply output terminal, and the switching circuit and the phase-locked loop circuit are connected in parallel to the multi-power supply system. When the multi-power supply system fails, the switching circuit switches the power supply to the bypass power supply through the SST circuit; The phase-locked circuit locks the phase of the non-bypass power input terminal, and switches to the bypass phase before power switching occurs in the event of a fault.

[0021] like Figure 1As shown in the figure, the power system provided in this embodiment of the present invention is described with two inputs and one output as an example, but more inputs can adopt a similar access process, which will not be described in detail in this invention.

[0022] Specifically, this power supply system has two operating modes. One is the normal operating mode, where all power inputs are working normally. The power is input to the voltage regulator and inverter circuit through their respective incoming circuit breakers. The voltage regulator and inverter circuit regulates and inverts the input power to ensure the quality and stability of the output power. The processed power then supplies power to the downstream equipment through the power output terminal.

[0023] In case of a fault, when a fault occurs at the input of a multi-source power supply system, the switching circuit automatically switches the power supply to another normally operating power supply via the SST circuit (Static Switching Circuit). During the switching process, the phase-locked loop (PLL) locks the phase of the bypass power supply to ensure the output power supply phase remains stable, preventing equipment failure or operational instability caused by phase changes. The PLL locks the phase of one power input to ensure the output power supply phase is stable. During fault switching, if the B input is normal, the output phase is locked first; if the B input is abnormal, the output phase is locked first. When switching to bypass via STS, the output phase is switched to A before bypass switching. If a fault is possible, the power system can issue an alarm signal for overload, overvoltage, overcurrent, overheating, or phase loss. In case of short circuits, overloads exceeding permissible limits, overvoltages, overcurrents, overheating, or other faults endangering equipment / personnel safety, the power system will shut down and issue an alarm, and the STS will seamlessly switch to bypass power supply.

[0024] by Figure 1 Taking two power supplies as an example, if the phase-locked loop locks on power supply B and stops outputting, there is no phase difference or phase angle issue when the downstream power supply panel automatically switches between the two power supplies. Similarly, if the phase-locked loop locks on power supply B and automatically locks on power supply A when power supply B is de-energized, there is also no phase difference or phase angle issue when the downstream power supply panel automatically switches between the two power supplies.

[0025] The multi-channel power supply system provided by this utility model uses STS for bypass switching, with a response time of less than 1ms and no dependence on the main power supply. This ensures that the system can quickly switch to bypass power supply when the main power supply fails. Furthermore, the second input phase is locked by a phase-locked loop to ensure that there is no phase difference problem when the downstream power supply panel switches, thus avoiding impact on the load equipment.

[0026] Based on the above embodiments, the multi-power supply system further includes: An energy storage interface, wherein the energy storage interface is connected in parallel to the multi-power system; The energy storage interface is connected in series with a DC circuit breaker and a fuse.

[0027] It is understood that the multi-power system provided by this utility model has an energy storage interface connected in parallel. Because it is connected in parallel, the energy storage interface is connected in parallel with other parts of the system, such as the power input terminal and the voltage regulator inverter circuit, and is connected to the same voltage and current level. This connection method allows the energy storage interface to provide additional power support to the system when needed, and also allows energy storage devices (such as batteries) to be charged during normal system operation.

[0028] The energy storage interface is connected in series with a DC circuit breaker and a fuse. The DC circuit breaker is used to manually or automatically disconnect the energy storage device from the system under normal operation or fault conditions, ensuring safe isolation of the energy storage device during maintenance or emergencies. The fuse, as an overcurrent protection device, automatically melts and cuts off the circuit when excessive current occurs in the circuit, thereby protecting the energy storage device and the entire power system from damage caused by overload or short circuit.

[0029] When the main power input is working normally, the energy storage interface allows the energy storage device (usually a battery) to be charged through the charging circuit. When the main power input fails or is interrupted, the energy storage device can act as a backup power source, providing power to the system through the discharge circuit, ensuring that downstream equipment can continue to operate for a short period of time and enhancing the reliability of the system.

[0030] When temporary voltage fluctuations or interference occur at the power input terminal of a multi-power system, the energy storage interface can use the discharge of the energy storage device to buffer these fluctuations, thereby providing a relatively stable power supply to downstream equipment and reducing the impact of poor power quality on the equipment.

[0031] Based on the above embodiments, the energy storage interface is connected to an external battery, and the voltage and current of the battery are displayed.

[0032] Preferably, the energy storage interface provided in this embodiment of the invention is directly connected to a lead-acid battery, and the device can display the voltage and current of the lead-acid battery. It is necessary to prevent the device from reverse charging the battery. When the input power is normal (no phase loss or phase loss and voltage within ±10%), the device does not consume battery power, the battery does not experience instantaneous discharge, and the connection method is safe and reliable.

[0033] Based on the above embodiments, the power input terminal converts AC power to DC power through a four-bridge rectifier circuit.

[0034] It should be noted that in this embodiment of the utility model, the multiple input power supplies are rectified by a four-bridge rectifier after passing through the filter circuit and then enter the DC bus. The power supply can still work when one or two phases are missing, and there is no current on the N line when there is no phase missing or only one phase is missing, thus ensuring the power supply. It has the advantages of high reliability and high efficiency.

[0035] Specifically, a four-arm rectifier circuit is used to convert AC power to DC power, which is then fed into the DC bus. This four-arm rectifier circuit design allows the equipment to continue operating even when one or two phases are missing from the power supply, by utilizing the remaining phases for rectification. When a phase loss is detected, the equipment reacts quickly by adjusting its internal power distribution or reducing its output power to adapt to the situation. For example, when one or two phases are missing from a single power supply, the equipment will reduce its power consumption by 33% to 66%; when both power supplies are missing one or two phases, the equipment will reduce its power consumption by 66% to 100% to ensure stable operation.

[0036] Based on the above embodiments, the voltage-regulated inverter circuit includes: Voltage conversion module and inverter module; The power input terminal is connected to the input terminal of the voltage conversion module, the output terminal of the voltage conversion module is connected to the input terminal of the inverter module, and the output terminal of the inverter module is connected to the power output terminal.

[0037] Specifically, the voltage regulator inverter circuit consists of a voltage conversion module and an inverter module. These two modules work together to ensure the quality and stability of the output power supply.

[0038] A voltage conversion module, also known as a DC-DC module, converts the input power supply voltage to a suitable value for subsequent inverter processing, while simultaneously regulating the input power supply to eliminate voltage fluctuations. Its circuit operation involves the input power supply being rectified into DC by a rectifier circuit, the current ripple being smoothed by a filter circuit, and the DC-DC converter precisely adjusting the DC voltage to achieve the stable voltage value required by the inverter module.

[0039] Understandably, voltage stabilization before inversion improves the reliability of the inverter module, reduces heat generation, and stabilizes the output voltage accuracy. In the entire power supply, the inverter module bears the most stress; stabilizing the DC voltage at the inverter module's input reduces this stress and significantly improves overall reliability.

[0040] The inverter module converts the regulated DC power supply into AC power, ensuring stable frequency and voltage of the output AC power. Its circuit works by using SPWM technology to convert DC power into a high-frequency pulse width modulation signal, which is then smoothed into a sinusoidal AC power supply by a filter circuit, ultimately outputting a stable frequency and voltage AC power supply for subsequent equipment.

[0041] In terms of overall performance, the voltage-regulating inverter circuit provided by this invention, through rectification, filtering, and DC-DC conversion by the voltage conversion module, can effectively eliminate voltage fluctuations in the input power supply, providing a stable DC power supply to the inverter module, thereby ensuring stable output voltage. Furthermore, it can quickly respond to load changes and maintain stable output voltage. During sudden load changes, a fast control algorithm promptly adjusts the inverter module output, ensuring reliable equipment operation.

[0042] Based on the above embodiments, the power output terminal includes: Transformers, thyristors, pressure-controlled circuit breakers and output copper busbars; The output terminal of the inverter module is connected to the transformer. After the transformer transforms the voltage, it is connected to the output copper busbar through the thyristor and the voltage-controlled maintenance circuit breaker for output.

[0043] Specifically, the output terminal provided by this utility model mainly includes a transformer, a thyristor, a voltage-controlled maintenance circuit breaker, and an output copper busbar. These components work together to ensure the quality and safety of the output power.

[0044] The main function of a transformer is to convert the voltage output from an inverter module into a voltage value suitable for downstream equipment. This can be achieved by adjusting the turns ratio of the electromagnetic coil to output the required voltage. Thyristors are used to regulate and control the voltage and current of the output power supply, ensuring its stability and quality. Generally, the gate current is controlled to trigger and turn off the thyristors. At the power output terminal, the thyristors regulate the output voltage through phase control, i.e., by changing the phase angle of the thyristor conduction, the magnitude of the output voltage is controlled. The pressure-controlled maintenance circuit breaker provided by this invention is a switching device with overload and short-circuit protection functions, while also facilitating maintenance. During normal operation, the pressure-controlled maintenance circuit breaker is in the closed state, and current can pass through the contacts and arc-extinguishing chamber. In case of circuit overload or short circuit, the trip unit activates, causing the circuit breaker to trip and disconnect the circuit protection equipment. When maintenance is required, the circuit breaker can also be manually disconnected to ensure safety. The output copper busbar, as the final conductor of the power output, reliably transmits power to downstream equipment. Output copper busbars are copper conductors with a certain cross-sectional area. Leveraging copper's excellent conductivity and high current-carrying capacity, they collect and transmit current. Connecting with circuit breakers, cables, and other components, they establish a robust electrical path, ensuring efficient and low-loss power transmission to downstream equipment.

[0045] Based on the above embodiments, in the multi-channel power supply system, the neutral lines connected to the power input terminals of any two channels are isolated from each other.

[0046] In this embodiment of the invention, the neutral wire of each power input is independent and there is no direct electrical connection between them. This design ensures that the neutral current of each power supply can only flow within its own power circuit and will not interfere with or overlap with each other. The isolated neutral wire design helps ensure the independence and stability of the power inputs and prevents interference between the neutral currents of different power inputs. This isolation effectively reduces current coupling between neutral wires, reduces fluctuations in neutral current, and improves the power quality of the entire power system. In multi-power supply systems, the use of an isolated neutral wire structure can effectively avoid interference between the neutral currents of different power inputs, ensuring the independence and stability of each power input. This design helps improve system reliability, reduce the risk of failure, and facilitates equipment maintenance and repair.

[0047] Specifically, in this embodiment of the utility model, each power input is provided with an independent neutral circuit, and the neutral circuits are electrically isolated from each other through insulating materials and independent wiring methods.

[0048] Based on the above embodiments, in the multi-channel power supply system, the neutral wire connected to the power input terminal of any channel is isolated from the neutral wire connected to the power output terminal.

[0049] In a multi-power supply system, the neutral wire connected to the power input terminal of any power supply is isolated from the neutral wire connected to the power output terminal. This isolation design prevents the neutral current at the power input terminal from directly flowing into the power output terminal, thus preventing mutual interference between neutral currents and improving system stability and safety. Each power input and output terminal has an independent neutral wire loop, and these loops are electrically isolated from each other using insulating materials and independent wiring methods. Furthermore, because the neutral wires at the power input and output terminals are independent, a fault in one power input or output terminal can be quickly located to the specific power circuit, facilitating troubleshooting and handling.

[0050] Based on the above embodiments, the multi-channel power supply system further includes a reset circuit, which is connected to the switching circuit. When the fault is recovered, the reset circuit controls the switching circuit to reset.

[0051] In this embodiment of the invention, the reset circuit is an important component of the multi-power supply system. It is connected to the switching circuit via wires, forming a complete control loop. This connection method allows the reset circuit to monitor the status of the switching circuit in real time and control the switching circuit when necessary.

[0052] The primary function of the reset circuit is to restore the switching circuit to its initial state after a fault is resolved. When a power system fault occurs, the switching circuit switches the power supply to a bypass to maintain power continuity. Once the fault is cleared, the reset circuit sends a control signal to restore the switching circuit to normal power supply status.

[0053] The reset circuit monitors the status of the switching circuit in real time, including the voltage and current at the power input terminal and the operating status of the switching circuit. When a fault is detected, the reset circuit records the fault information and prepares for a reset operation.

[0054] After the fault is recovered, the reset circuit generates a reset signal according to preset logic conditions. This signal controls the electronic switches in the switching circuit, such as relays and IGBTs, to reset the switching circuit and restore the system to normal power supply.

[0055] Understandably, this reset circuit design allows for rapid reset of the switching circuit, enabling the system to quickly return to normal power supply and reducing the duration of the fault's impact on equipment operation.

[0056] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0057] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0058] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A multi-source power supply system, characterized in that, include: It includes at least two power input terminals, a voltage regulator inverter circuit, a power output terminal, a switching circuit, and a phase-locked loop circuit; In this system, the input terminal of each power supply is connected to the input terminal of the voltage-stabilized inverter circuit through its respective connected incoming circuit breaker, the output terminal of the voltage-stabilized inverter circuit is connected to the power supply output terminal, and the switching circuit and the phase-locked loop circuit are connected in parallel to the multi-power supply system. When the multi-power supply system fails, the switching circuit switches the power supply to the bypass power supply through the SST circuit; The phase-locked circuit locks the phase of the non-bypass power input terminal, and switches to the bypass phase before power switching occurs in the event of a fault.

2. The multi-channel power supply system according to claim 1, characterized in that, The multi-power supply system also includes: An energy storage interface, wherein the energy storage interface is connected in parallel to the multi-power system; The energy storage interface is connected in series with a DC circuit breaker and a fuse.

3. A multi-channel power supply system according to claim 2, characterized in that, The energy storage interface is connected to an external battery and displays the voltage and current of the battery.

4. A multi-source power supply system according to claim 1, characterized in that, The power input terminal converts AC power to DC power through a four-bridge rectifier circuit.

5. A multi-channel power supply system according to claim 1, characterized in that, The voltage-regulated inverter circuit includes: Voltage conversion module and inverter module; The power input terminal is connected to the input terminal of the voltage conversion module, the output terminal of the voltage conversion module is connected to the input terminal of the inverter module, and the output terminal of the inverter module is connected to the power output terminal.

6. A multi-source power supply system according to claim 5, characterized in that, The power output terminal includes: Transformers, thyristors, pressure-controlled circuit breakers and output copper busbars; The output terminal of the inverter module is connected to the transformer. After the transformer transforms the voltage, it is connected to the output copper busbar through the thyristor and the voltage-controlled maintenance circuit breaker for output.

7. A multi-source power supply system according to claim 1, characterized in that, In the multi-channel power supply system, the neutral wires connected to the power input terminals of any two channels are isolated from each other.

8. A multi-source power supply system according to claim 1, characterized in that, In the multi-channel power supply system, the neutral wire connected to the power input terminal of any channel is isolated from the neutral wire connected to the power output terminal.

9. A multi-source power supply system according to claim 1, characterized in that, The multi-channel power supply system also includes a reset circuit, which is connected to the switching circuit. When the fault is recovered, the reset circuit controls the switching circuit to reset.

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