Power distribution cabinet and control method and control system thereof

Abstract

The application discloses a power distribution cabinet and a control method and system thereof, and relates to the technical field of power distribution cabinets.The application comprises the following steps: if a manual mode instruction is received, switching to power supply by a power supply corresponding to a power supply selection signal; if an automatic mode instruction is received, switching to power supply by a mains power supply when it is judged that the mains power supply state is normal; and switching to power supply by a backup power supply when it is judged that the mains power supply state is abnormal and the backup power supply state is normal.The control method provided by the application introduces a selectable manual and automatic dual-mode control mechanism, allows an operator to freely switch control strategies according to actual operation and maintenance requirements, and ensures uninterrupted power supply of key loads, greatly improves response speed and reliability in the automatic mode, and allows personnel to directly specify a priority power supply, thereby providing reliable protection for special scenes such as equipment testing and emergency drills in the manual mode.

Description

Technical Field

[0001] This application relates to the technical field of power distribution cabinets, and in particular to a power distribution cabinet and its control method and control system. Background Technology

[0002] In applications requiring extremely high power continuity, such as vehicle-mounted, modular, and field operations, power distribution cabinets typically connect to both mains and generator power sources to ensure continued system operation even when the main power supply is interrupted. Reliable switching between these two power sources is crucial for ensuring uninterrupted power supply. Currently, common solutions rely on mechanical manual transfer switches or contactor-based automatic transfer devices. While the former is simple in structure, it is entirely dependent on manual operation and cannot respond quickly to sudden mains power failures, inevitably leading to load power outages and failing to meet the high reliability requirements of critical tasks. The latter, while enabling automatic switching in case of faults, typically has fixed and simplistic control logic, offering only a basic automation function of "switching when the main power supply fails," lacking flexible operating mode selection. Summary of the Invention

[0003] The main purpose of this application is to provide a power distribution cabinet and its control method and control system, which aims to solve the technical problems of the single control mode and lack of operational flexibility of the existing dual power switching device.

[0004] To achieve the above objectives, this application proposes a control method for a power distribution cabinet, wherein the power distribution cabinet is connected to both mains power and a backup power supply, comprising: Receive a mode selection instruction, which includes a manual mode instruction or an automatic mode instruction; If the manual mode command is received, then according to the power selection signal of the manual mode command, switch to be powered by the mains power or backup power corresponding to the power selection signal; If the automatic mode command is received, the status of the mains power supply and the backup power supply is determined; When it is determined that the mains power supply is in normal condition, switch to mains power supply. When it is determined that the mains power supply is in an abnormal state and the backup power supply is in a normal state, the system switches to power supply from the backup power supply.

[0005] In one embodiment, the specific steps for determining the status of the mains power supply and the backup power supply include: Obtain the input voltages of the mains power supply and the backup power supply; When the input voltage of the mains power supply or the backup power supply is detected to be within the preset normal voltage range, the corresponding power supply status is determined to be normal. When the input voltage of the mains power supply or the backup power supply is detected to be lower than the preset undervoltage protection threshold or higher than the preset overvoltage protection threshold, the corresponding power supply status is determined to be abnormal.

[0006] In one embodiment, the undervoltage threshold is 176V, the overvoltage protection threshold is 264V, and the normal voltage range is 187V to 253V.

[0007] In one embodiment, the step of switching to backup power supply when it is determined that the mains power supply is in an abnormal state and the backup power supply is in a normal state further includes: During periods when powered by backup power, the power status of the mains power supply is continuously monitored; When the power supply status of the mains power source is detected to return to the normal voltage range, the system switches to be powered by the mains power source.

[0008] In one embodiment, it further includes: The manual mode command is received while the power supply is being provided by mains power or backup power. According to the power selection signal of the manual mode command, switch to be powered by the specified mains power or backup power.

[0009] In one embodiment, the power distribution cabinet is also connected to an uninterruptible power supply (UPS), and the mains power supply or backup power supply is connected to the load through the main load circuit; the control method further includes: Receive UPS power supply mode command; According to the UPS power supply mode command, the system controls the switch to supply power to the load via the uninterruptible power supply, or switches the system to supply power to the load via the main load circuit.

[0010] In one embodiment, the UPS power supply mode commands include online mode commands, bypass mode commands, and disconnect commands; If the online mode command is received, the power supply is switched to the uninterruptible power supply to supply power to the load; If the bypass mode command is received, the power supply to the load is switched to the main load circuit; If the disconnect command is received, the uninterruptible power supply, the main load circuit, and the load are connected to the power supply.

[0011] In addition, to achieve the above objectives, this application also proposes a control system, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method for the power distribution cabinet as described above.

[0012] Furthermore, to achieve the above objectives, this application also proposes a power distribution cabinet, including the control system as described above, and Cabinet; AC power input module, used for connecting to AC power supply; Backup power input module, used to connect to backup power; The power switching module is electrically connected to the mains input module and the generator input module, and is used to select whether to be powered by the mains power supply or the backup power supply according to the control command.

[0013] In one embodiment, it further includes: UPS input module, used to connect to an uninterruptible power supply; The UPS power supply switching module is connected to the mains input module, the backup power input module and the UPS input module, and is used to select whether to supply power to the load from the uninterruptible power supply or switch to supply power to the load from the main load circuit according to the control command.

[0014] One or more technical solutions proposed in this application have at least the following technical effects: The control method provided in this application addresses the shortcomings of traditional solutions in terms of flexibility and intelligence by introducing a selectable manual and automatic dual-mode control mechanism. This method allows operators to freely switch control strategies according to actual operational needs: in automatic mode, the system monitors the status of both power supplies in real time and intelligently switches between them to ensure uninterrupted power supply to critical loads, significantly improving response speed and reliability; in manual mode, personnel can directly specify the priority power supply, providing reliable protection for special scenarios such as equipment testing and emergency drills. This approach ensures autonomy in daily operation while retaining manual control in critical situations, enhancing the system's adaptability to different application scenarios. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a flowchart illustrating an embodiment of a control method for a power distribution cabinet according to this application. Figure 2 This is a flowchart illustrating a second embodiment of a control method for a power distribution cabinet according to this application. Figure 3 This is a structural frame diagram of a third embodiment of a power distribution cabinet according to this application; Figure 4 This is a structural diagram of a fourth embodiment of a power distribution cabinet according to this application.

[0018] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0020] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0021] In applications requiring extremely high power continuity, such as vehicle-mounted, modular, and field operations, power distribution cabinets typically connect to both mains power and a generator to ensure continued system operation even when the main power supply is interrupted. Achieving reliable switching between these two power sources is crucial for ensuring uninterrupted power supply.

[0022] Currently, common solutions mainly fall into two categories: mechanical manual transfer switches and contactor-based automatic transfer devices. Mechanical manual transfer switches are essentially electrical switches that achieve interlocking through physical structure. Their design principle ensures that only one power source can be connected at any given time, thus preventing accidents caused by accidental parallel connection of two power sources. This solution stems from its pursuit of ultimate physical reliability and cost control, but at the cost of complete reliance on manual judgment and operation. When a sudden power outage occurs, the operator must first detect the power failure before proceeding to the equipment location to manually switch the power. This process inevitably results in a relatively long power outage interval for the load equipment. For critical loads such as communications, medical, and command systems, such interruptions are often unacceptable.

[0023] To overcome the delays of manual response, contactor-based automatic switching devices have emerged. The core principle of these devices is to monitor the electrical parameters of the primary power supply in real time through a voltage detection circuit. When the parameters exceed the preset normal range, the control circuit drives the electromagnetic contactor to physically switch the load circuit from the primary power supply to the backup power supply. However, its automatic function essentially embeds a fixed, preset logic into the hardware circuitry. This logic is usually extremely simple: continuous monitoring – fault diagnosis – execution of switching. Its initial design purpose is to replace manual handling of the most basic fault responses. Because of this, it lacks higher-level operational flexibility: once the system is set to automatic mode, operators find it difficult to intervene temporarily or force a power supply selection when needed. The dilemma lies in the fact that the convenience brought by automation comes at the cost of operational flexibility; the system can operate according to a single script and cannot adapt to the complex and ever-changing needs of on-site maintenance.

[0024] To address the aforementioned shortcomings, this application proposes a control method for a power distribution cabinet, wherein the power distribution cabinet is connected to both mains power and a backup power supply, such as... Figure 1 As shown, it includes: S100: Receive a mode selection instruction, the mode selection instruction including a manual mode instruction or an automatic mode instruction; S200: If the manual mode command is received, switch to power supply from the mains power supply or backup power supply corresponding to the power selection signal of the manual mode command. S300: If the automatic mode command is received, determine the status of the mains power supply and the backup power supply; S400: When it is determined that the mains power supply is in normal condition, switch to mains power supply; S500: When it is determined that the mains power supply is in an abnormal state and the backup power supply is in a normal state, switch to power supply from the backup power supply.

[0025] Specifically, this application proposes a control method for a power distribution cabinet, wherein the power distribution cabinet is connected to a mains power supply and a backup power supply, including the following steps S100 to S500: In step S100, the power distribution cabinet receives operation commands via a physical switch or remote communication interface on its panel. The switch provides three physical positions: automatic, mains power, and backup power. When the switch is in the automatic position, the system generates an automatic mode command; when the switch is in the mains power or backup power position, the system generates a manual mode command corresponding to the power selection signal. This step establishes the logical framework for system operation, dividing control authority into two paths: automatic decision-making and manual specification.

[0026] In step S200, if the system receives a manual mode command, it immediately parses the power selection signal carried by the command. The control unit directly drives the power switching actuator to connect the load's power supply circuit to the power source specified in the command, i.e., mains power or backup power. In this mode, the system does not perform power status judgment and strictly follows the operator's mandatory selection. This ensures the operator's absolute control over the power supply during equipment testing, maintenance, or specific tactical requirements.

[0027] In step S300, if the system receives an automatic mode command, it initiates the automatic control process. The control unit first continuously or periodically collects electrical parameters of the mains power supply and backup power supply through a voltage detection circuit, a frequency detection circuit, or a comprehensive power quality monitoring module. The system compares the collected parameters, such as voltage and frequency values, with preset normal operating threshold ranges to determine whether the current status of each power supply is "normal" or "abnormal".

[0028] When the judgment result of step S300 indicates that the mains power supply is normal, the system proceeds to step S400. The control unit sends a control signal to drive the actuator to switch the load to or maintain mains power supply. This logic establishes the principle of mains power priority; as long as the mains power meets the power quality requirements, the system prioritizes using mains power, which helps reduce operating costs and equipment wear. When the judgment result of step S300 indicates that the mains power supply is abnormal, the system proceeds to step S500. Simultaneously, if the backup power supply is normal, the control unit sends a control signal to drive the actuator to switch the load from mains power supply to backup power supply. This logic ensures that when the primary power supply fails and the backup power supply is available, the system can automatically complete a seamless or short-term interruption switch of the power supply link, guaranteeing the continuous operation of the load equipment.

[0029] The specific implementation method involves the following system structure and information flow: The input power of the programmable power distribution cabinet includes AC220V mains power and AC220V generator. The cabinet contains a power supply switching module and an output distribution module. The power supply switching module is responsible for performing the physical conversion between the aforementioned power sources; the output distribution module is responsible for distributing electrical energy to each downstream load. Simultaneously, the power distribution cabinet is equipped with a network interface for communication with a host computer monitoring system, enabling status uploading, parameter setting, and remote command issuance. The power selection switch on the panel is directly associated with the control, and its position definition and control logic correspondence are as follows: when the switch is in automatic mode, the automatic selection logic S300 to S500 is executed, with mains power having a higher priority than generator; when the switch is in mains power mode, the manual logic forcing the use of mains power is executed; when the switch is in generator mode, the manual logic forcing the use of the generator is executed.

[0030] This method addresses the rigid control logic and lack of operational flexibility of traditional solutions by establishing two independent control modes: manual and automatic. The manual mode provides deterministic, mandatory control to meet specific operational and maintenance needs; the automatic mode achieves intelligent switching based on power status monitoring, ensuring power continuity. The two modes are clearly isolated by a hardware switch, avoiding logical conflicts and improving system reliability and maintainability. An integrated communication interface allows for remote monitoring of power status, switching events, and other information, providing a foundation for intelligent operation and maintenance management.

[0031] In one embodiment, the specific steps for determining the status of the mains power supply and the backup power supply are as follows: Figure 2 As shown, it includes: S310: Obtain the input voltage of the mains power supply and the backup power supply; S320: When the input voltage of the mains power supply or the backup power supply is detected to be within the preset normal voltage range, the corresponding power supply status is determined to be normal. S330: When the input voltage of the mains power supply or the backup power supply is detected to be lower than the preset undervoltage protection threshold or higher than the preset overvoltage protection threshold, the corresponding power supply status is determined to be abnormal.

[0032] In this embodiment, the specific steps for determining the status of the mains power supply and the backup power supply include steps S310 to S330: In step S310, the control unit acquires the instantaneous or effective values ​​of the AC voltage from the two power sources in real time or periodically through a voltage sampling circuit connected to the mains power input terminal and the backup power input terminal. The voltage sampling circuit typically includes a voltage transformer or a voltage divider resistor network, as well as a signal conditioning and analog-to-digital conversion module, to convert the voltage signal into a digital voltage signal that the control unit can process.

[0033] In step S320, the control unit compares the digital voltage signal obtained in step S310 with a preset normal voltage range stored in non-volatile memory. The lower limit of this normal voltage range is a first voltage threshold, and the upper limit is a second voltage threshold. When the input voltage value of a certain power supply is detected to be greater than or equal to the first voltage threshold and less than or equal to the second voltage threshold, the control unit determines that the power supply status is "normal". This determination means that the voltage quality of the power supply meets the basic requirements for supplying power to the load.

[0034] In step S330, the control unit compares the digital voltage signal obtained in step S310 with preset undervoltage protection thresholds and overvoltage protection thresholds. When the input voltage of a power supply is detected to be lower than the undervoltage protection threshold or higher than the overvoltage protection threshold, the control unit determines that the power supply is in an "abnormal" state. The undervoltage protection threshold is lower than the lower limit of the normal voltage range, and the overvoltage protection threshold is higher than the upper limit of the normal voltage range. This determination means that the power supply voltage has exceeded the safe operating range, which may damage downstream equipment or indicate that the power supply itself is faulty.

[0035] In this specific implementation, the undervoltage protection threshold is set to 176V, the overvoltage protection threshold is set to 264V, and the normal voltage range is set to 187V to 253V. There is a hysteresis interval between this range and the protection thresholds; for example, the undervoltage recovery point is 187V, and the overvoltage recovery point is 253V. This setting aims to prevent frequent operation of the protection circuit or switching logic when the power supply voltage fluctuates near the critical point.

[0036] The operation process of the combined protection function is as follows: When the control unit detects that the AC input voltage is below 176V, it activates undervoltage protection. The control unit first shuts off the power supply output circuit for that AC input to protect downstream loads. Simultaneously, it activates a continuous alarm sound and illuminates the fault indicator light. When the input voltage rises above 187V, the control unit restores the power supply capability for that AC input. After the operator clears the alarm using the silence / reset button, the system automatically restores the power distribution output state before the power failure, without requiring manual reconfiguration of the output channels.

[0037] When the control unit detects an AC input voltage higher than 264V, it activates overvoltage protection. The control unit shuts off the power supply output circuit for that AC input, triggers a continuous buzzer, and illuminates the fault indicator light. When the input voltage drops below 253V, the control unit restores the power supply capability for that AC input. After the alarm is cleared, the system automatically restores the power distribution output to its pre-fault state.

[0038] The control unit monitors the output current of each output circuit through current sampling elements connected in series. When the current value of an output circuit exceeds its set overcurrent protection threshold, the control unit automatically shuts off the power supply to that output. Simultaneously, it drives a buzzer to sound continuously, illuminates the main fault indicator light, and extinguishes the indicator light of the faulty channel to indicate the specific fault location. After troubleshooting, the stop / reset button must be pressed and held to clear the fault lock state. Then, the corresponding channel's button can be pressed to re-energize and monitor that output.

[0039] This embodiment provides a clear, quantified threshold-based decision-making basis for the automatic switching mode through voltage judgment steps S310 to S330, making the switching action objective and reliable and avoiding subjective misjudgment. The separation of state judgment from specific protection actions creates a clear logical hierarchy. A hysteresis range is provided between the set normal voltage range (187V-253V) and the protection thresholds (176V, 264V), effectively preventing system oscillations caused by critical voltage fluctuations. Integrated undervoltage, overvoltage, and output overcurrent protection functions construct multi-level hardware and software protection outside the power switching logic, improving the safety of the system and load equipment. The design of automatically restoring power distribution output after fault clearance reduces maintenance steps and improves system availability. Audible and visual alarms and channel indicators provide human-machine interaction and fault location information.

[0040] In one embodiment, the subsequent step of switching to power from the backup power source when it is determined that the mains power supply is in an abnormal state and the backup power supply is in a normal state further includes: During the period when the backup power supply is in operation, the power status of the mains power supply is continuously monitored; when the power status of the mains power supply is detected to return to the normal voltage range, the system switches to power supply from the mains power supply.

[0041] In addition, while being powered by mains power or backup power, the manual mode command is received; and according to the power selection signal of the manual mode command, the power is switched to be powered by the designated mains power or backup power.

[0042] It can be understood that, in this embodiment, when it is determined that the mains power supply is in an abnormal state and the backup power supply is in a normal state, the steps after switching to power from the backup power supply further include: After the system has switched to backup power, the control unit continues to periodically or in real-time monitor the input voltage of the mains power supply through a voltage sampling circuit. This monitoring process is independent of the current power supply, ensuring continuous awareness of the mains power recovery status. The control unit continuously monitors and acquires the mains power voltage data, comparing it with a preset normal voltage range. When the mains power input voltage is detected to remain within the normal voltage range (e.g., 187V to 253V) for a preset stabilization time (e.g., 30 seconds), the control unit determines that the mains power status has returned to stable and normal. Subsequently, the control unit generates a switching control signal to drive the power switching actuator, switching the load's power supply circuit from the backup power supply back to the mains power supply.

[0043] Regardless of whether the system is currently powered by mains power or a backup power source, the control unit always responds to mode selection commands from the panel switch or remote communication interface. When the system receives a manual mode command, the control unit immediately interrupts the current automatic control logic or power supply state. The control unit parses the power selection signal carried by the manual mode command and directly drives the power switching actuator to switch the load to the power source specified in the command. This process does not rely on the judgment of the target power source status, but can be combined with necessary safety interlock logic, such as prohibiting switching or issuing an alarm when the target power source is detected to be completely without voltage.

[0044] This embodiment adds an automatic switchback function, enabling the system to automatically return to mains power after a mains power failure, reducing the continuous operation time and energy consumption of the backup power supply, conforming to the principle of economy, and restoring the system to its normal priority. A continuous monitoring mechanism ensures the accuracy of the switchback timing, and a preset stabilization time avoids frequent or oscillating switching caused by brief mains voltage recovery. The high-priority response of manual mode commands under any power supply state ensures that operators can directly control the system's power source at any time in emergencies, maintenance operations, or specific testing needs, achieving real-time coverage and seamless integration of automatic and manual control, enhancing the system's flexibility and controllability in complex operating conditions. The entire control process clearly defines the response priorities and execution paths under different modes and events, improving the system's determinism and reliability.

[0045] In one embodiment, the power distribution cabinet is also connected to an uninterruptible power supply (UPS), and the mains power supply or backup power supply is connected to the load through the main load circuit; the control method further includes: Receive UPS power supply mode command; according to the UPS power supply mode command, control the switch to supply power to the load by the uninterruptible power supply, or switch the switch to supply power to the load by the main load circuit.

[0046] In this embodiment, the power distribution cabinet is also connected to an uninterruptible power supply (UPS). The mains power supply or backup power supply is connected to the load through the main load circuit, and the uninterruptible power supply is connected to the load through an independent power supply circuit. The control method further includes the following steps: The control unit receives UPS power supply mode commands via an independent toggle switch on the panel, a position integrated with the main mode selection switch, or a remote communication interface. These commands select whether the load is powered by the main load circuit or the uninterruptible power supply (UPS) circuit. Based on the received UPS power supply mode command, the control unit drives the corresponding switching actuator. If the command requests a switch to UPS power supply, the control unit connects the load to the UPS output circuit while disconnecting the load from the main load circuit. If the command requests a switch to the main load circuit, the control unit connects the load to the main load circuit while disconnecting the load from the UPS circuit. This switching process ensures that the load is powered by only one power source at any given time.

[0047] In addition, the specific implementation also includes a leakage current protection function, the operation of which is as follows: Leakage current detection devices, such as residual current devices (RCDs) or vector sum detection devices via current transformers, are installed at the AC output terminals of the socket circuit and the UPS socket circuit. The control unit continuously monitors the leakage current values ​​of these circuits.

[0048] When the control unit detects a momentary leakage current value greater than or equal to 25mA in the socket circuit or UPS socket circuit, or detects a cumulative leakage current value greater than or equal to 100mA in any circuit within a specific time period, a leakage fault is determined to have occurred. Subsequently, the control unit immediately generates a shutdown command to cut off the faulty output. Simultaneously, a buzzer sounds a continuous alarm and the fault indicator light illuminates. After the physical cause of the leakage fault has been eliminated, the operator must press the fault reset button on the distribution cabinet panel. Upon receiving the reset signal, the control unit releases the fault lockout state for that output, allowing power to be restored to that output. Power restoration can be achieved through automatic reclosing or manual reactivation of the output switch.

[0049] This embodiment introduces independent UPS power supply mode commands and corresponding switching controls, providing the load with the option of direct power supply from an uninterruptible power supply. This is suitable for special scenarios requiring isolated maintenance of the main power distribution system or where the load must be powered by a clean uninterruptible power supply, increasing the diversity and reliability of the system power supply scheme. The switching logic avoids the risk of the main circuit and UPS circuit simultaneously supplying power to the load. The added leakage current protection function provides specific safety protection for end circuits such as sockets, which are prone to electric shock or insulation failure. Employing both instantaneous and cumulative values ​​as criteria, it can quickly respond to severe sudden leakage current and also prevent the risk of cumulative leakage current due to slow insulation degradation, improving electrical safety. The manual reset mechanism after a fault prevents the danger of automatically restoring power before the fault is cleared, complying with safe operating procedures.

[0050] In one embodiment, the UPS power supply mode commands include online mode commands, bypass mode commands, and disconnect commands; If the online mode command is received, the power supply is switched to the uninterruptible power supply to supply power to the load; If the bypass mode command is received, the power supply to the load is switched to the main load circuit; If the disconnect command is received, the uninterruptible power supply, the main load circuit, and the load are connected to the power supply.

[0051] In this embodiment, the UPS power supply mode commands include online mode commands, bypass mode commands, and disconnect commands. The control unit receives these commands through a UPS power selection switch on the panel, which has three physical positions: online, bypass, and disconnect.

[0052] If the online mode command is received, the control unit drives the switching actuator to switch the power supply circuit of the specified load group, including but not limited to the display console, rack server, network equipment, lighting, and dedicated sockets, from the main load circuit to the output circuit of the uninterruptible power supply (UPS). At this time, the load group is powered by the UPS. If the bypass mode command is received, the control unit drives the switching actuator to switch the power supply circuit of the load group back from the UPS output circuit to the main load circuit. At this time, the load group is directly powered by the power supply connected to the current main load circuit, and the UPS is bypassed. If the disconnect command is received, the control unit drives the switching actuator to simultaneously disconnect the electrical connection between the load group and the UPS output circuit and the main load circuit. At this time, the load group is in a completely de-energized state.

[0053] In a specific implementation, the UPS power selection switch on the panel is directly associated with the control logic: when the switch is in the online position, an online mode command is generated, and the UPS supplies power to all designated loads; when the switch is in the off position, a disconnect command is generated, cutting off the power supply to all designated loads; when the switch is in the bypass position, a bypass mode command is generated, and the mains power or generator directly supplies power to all designated loads.

[0054] This embodiment provides flexible and selectable power path management for load groups by setting three explicit UPS power supply mode commands. Online mode ensures that equipment receives a regulated, filtered, and uninterrupted clean power supply, suitable for scenarios with poor power grid quality or requiring zero interruption. Bypass mode allows critical loads to be safely and quickly switched to the main circuit for power supply when the UPS needs maintenance, failure, or testing, ensuring business continuity and facilitating maintenance operations. Disconnect mode provides a means of overall electrical isolation for all specified loads, meeting the rigid requirements of equipment maintenance, safety inspections, or emergency power outages. The three modes are physically selected via hardware switches, with clear and mutually exclusive commands, avoiding misoperation and logical conflicts, and improving the safety and determinism of system operation.

[0055] In one embodiment, the power distribution cabinet has a leakage voltage protection function. This function is achieved by monitoring the potential difference between the vehicle ground and the monitoring ground. The control unit continuously collects the voltage value between the vehicle ground and the monitoring ground through a voltage detection circuit. When the control unit detects that the leakage voltage value is greater than or equal to AC36V, it determines that a leakage voltage fault has occurred. The control unit immediately generates a cut-off command to disconnect the main AC power output or the relevant affected output circuits. At the same time, it drives the buzzer to emit a continuous alarm sound and illuminates the fault indicator light. After the fault is cleared and the system is powered on again, the control unit automatically restores the power distribution output state before the fault occurred, without the need for manual reconfiguration of each output channel.

[0056] When the control unit detects a loop resistance value greater than or equal to 50kΩ between the vehicle ground and the monitored ground, it determines that the insulation resistance is abnormal. At this time, the control unit illuminates the fault indicator light and activates the buzzer to sound an alarm, but does not cut off the power supply output. When the loop resistance value returns to the normal range, the control unit automatically stops the audible and visual alarm. A silence / reset button is provided on the panel. In alarm mode, pressing this button for the first time silences the buzzer; pressing it again resumes the buzzer sound.

[0057] In this embodiment, the leakage voltage protection function provides safety protection against the risk of ground potential rise caused by abnormalities in the vehicle grounding system or insulation faults. When the leakage voltage exceeds the safety limit, the power supply is quickly cut off to prevent electric shock. The insulation resistance monitoring function can provide early warning of insulation degradation trends without interrupting power, facilitating preventative maintenance. The original output configuration is automatically maintained after the fault is recovered, reducing maintenance complexity. An independent alarm silence function allows temporary disabling of audible alarms without affecting fault indication.

[0058] In one embodiment, the power distribution cabinet has communication capabilities. The control unit establishes a data connection with the uninterruptible power supply (UPS) through a preset communication interface to achieve status information exchange and control command transmission. The control unit has a built-in network communication module, providing a standard Ethernet interface. This interface supports the UDP network communication protocol, allowing the control unit to communicate with the host computer management system. A local / remote mode switch button is provided on the panel. Pressing this button illuminates the button indicator light, and the control unit switches to remote control mode. In this mode, the control unit receives remote control commands from the host computer and can perform power-on / power-off operations on the entire cabinet and independent start / stop operations on each output channel.

[0059] In remote mode, the control unit periodically, or upon request from the host computer, uploads real-time operating data and fault information for each output via the network port. The uploaded AC output information includes voltage, current, and frequency values, as well as the status of overcurrent, over / undervoltage, and leakage current faults. The uploaded DC output information includes voltage and current values, as well as the status of overcurrent faults.

[0060] In this embodiment, the communication function enables the power distribution cabinet to be integrated into a broader monitoring and management system. Communication with the UPS facilitates coordination of power supply strategies and acquisition of UPS status. The network interface and remote control mode support centralized monitoring and unattended operation, improving management efficiency and response speed. The data upload function provides a data foundation for operational status analysis, fault recording, and energy efficiency management. The hard switch button for local / remote mode ensures clear control and operational safety.

[0061] Furthermore, to achieve the above objectives, this application also proposes a control system, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method for the power distribution cabinet as described above. This can be implemented using a main controller, such as a DSP (Digital Signal Processor), FPGA (Field Programmable Gate Array), MCU (Microcontroller Unit), or SOC (System on Chip).

[0062] It is worth noting that since the control system of the present invention is applied to the control method of the above-mentioned power distribution cabinet, the embodiments of the control system of the present invention include all the technical solutions of all embodiments of the control method of the above-mentioned power distribution cabinet, and the technical effects achieved are exactly the same, so they will not be repeated here.

[0063] In addition, to achieve the above objectives, such as Figure 3 As shown, this application also proposes a power distribution cabinet, including the control system as described above, and a cabinet; a mains input module for connecting to mains power; a backup power input module for connecting to a backup power source; a power switching module electrically connected to the mains input module and the generator input module, used to select power supply from the mains power source or the backup power source according to control commands; a UPS input module for connecting to an uninterruptible power supply; and a UPS power switching module connected to the mains input module, the backup power input module, and the UPS input module, used to select power supply from the uninterruptible power supply to the load, or switch to power supply from the main load circuit to the load according to control commands.

[0064] This application's power distribution cabinet can be understood to include the aforementioned control system and cabinet. Specifically, the power distribution cabinet includes the following functional modules: a mains input module for connecting to mains power. This module includes input terminals, a filtering circuit, and necessary protection components, forming the mains power input port. A backup power input module for connecting to backup power. This module includes input terminals, a filtering circuit, and necessary protection components, forming the backup power input port. A power switching module electrically connected to the mains input module and the backup power input module. This module receives instructions from the control system and drives an internal switching actuator, such as a contactor or static switch, to select whether to connect the mains power or the backup power to the main load circuit. This module ensures that the main load circuit is powered by only one power source at any given time.

[0065] The UPS input module is used to connect to an uninterruptible power supply (UPS). This module comprises two main parts: a UPS input port for providing charging and bypass power to the UPS; and a UPS output port for receiving the inverter output from the UPS. The UPS power switching module is connected to the mains input module, the backup power input module, and the UPS input module. This module receives UPS power mode commands from the control system and drives its internal switching actuator. When the command is in online mode, the module connects the load to the UPS output port of the UPS input module and disconnects the load from the main load circuit. When the command is in bypass mode, the module connects the load to the main load circuit and disconnects the load from the UPS output port. When the command is in disconnect mode, the module simultaneously disconnects the load from both the main load circuit and the UPS output port.

[0066] This embodiment achieves physical isolation between two different power sources by setting up independent mains input modules and backup power input modules, avoiding direct electrical coupling on the input side. The power switching module provides the ability to select and switch between the main power supply and the backup power supply. In the event of a main power supply failure, the backup power supply can take over, improving power continuity. The UPS input module provides a standard integrated interface for the uninterruptible power supply, clearly defining the electrical connection point and power flow between the power distribution system and the UPS. The UPS power switching module enables flexible selection and reliable switching of the load between UPS power supply and direct mains / backup power supply, meeting the differentiated requirements for power quality and availability in different scenarios. Each module has a clear division of labor and is coordinated through commands from the control system to form a complete system with multiple power inputs, UPS integration, and flexible power distribution functions. The modular structure facilitates system installation, commissioning, maintenance, and functional expansion.

[0067] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A control method of a power distribution cabinet connected to a commercial power source and a backup power source, characterized by, include: Receive a mode selection instruction, which includes a manual mode instruction or an automatic mode instruction; If the manual mode command is received, then according to the power selection signal of the manual mode command, switch to be powered by the mains power or backup power corresponding to the power selection signal; If the automatic mode command is received, the status of the mains power supply and the backup power supply is determined; When it is determined that the mains power supply is in normal condition, switch to mains power supply. When it is determined that the mains power supply is in an abnormal state and the backup power supply is in a normal state, the system switches to power supply from the backup power supply.

2. The control method of the power distribution cabinet according to claim 1, characterized in that, The specific steps for determining the status of the mains power supply and the backup power supply include: Obtain the input voltages of the mains power supply and the backup power supply; When the input voltage of the mains power supply or the backup power supply is detected to be within the preset normal voltage range, the corresponding power supply status is determined to be normal. When the input voltage of the mains power supply or the backup power supply is detected to be lower than the preset undervoltage protection threshold or higher than the preset overvoltage protection threshold, the corresponding power supply status is determined to be abnormal.

3. The control method of the power distribution cabinet according to claim 2, characterized in that, The undervoltage threshold is 176V, the overvoltage protection threshold is 264V, and the normal voltage range is 187V to 253V.

4. The control method for the power distribution cabinet according to claim 2, characterized in that, The step of switching to backup power supply when the mains power supply is found to be abnormal and the backup power supply is normal further includes: During periods when powered by backup power, the power status of the mains power supply is continuously monitored; When the power supply status of the mains power source is detected to return to the normal voltage range, the system switches to be powered by the mains power source.

5. The control method for the power distribution cabinet according to claim 2, characterized in that, Also includes: The manual mode command is received while the power supply is being provided by mains power or backup power. According to the power selection signal of the manual mode command, switch to be powered by the specified mains power or backup power.

6. The control method for the power distribution cabinet according to any one of claims 1-5, characterized in that, The power distribution cabinet is also connected to an uninterruptible power supply (UPS), and the mains power supply or backup power supply is connected to the load through the main load circuit; the control method further includes: Receive UPS power supply mode command; According to the UPS power supply mode command, the system controls the switch to supply power to the load via the uninterruptible power supply, or switches the system to supply power to the load via the main load circuit.

7. The control method for the power distribution cabinet according to claim 6, characterized in that, The UPS power supply mode commands include online mode commands, bypass mode commands, and disconnect commands. If the online mode command is received, the power supply is switched to the uninterruptible power supply to supply power to the load; If the bypass mode command is received, the power supply to the load is switched to the main load circuit; If the disconnect command is received, the uninterruptible power supply, the main load circuit, and the load are connected to the power supply.

8. A control system, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the control method for the power distribution cabinet as claimed in any one of claims 1 to 7.

9. A power distribution cabinet, characterized in that, Including the control system as described in claim 8, and Cabinet; AC power input module, used for connecting to AC power supply; Backup power input module, used to connect to backup power; The power switching module is electrically connected to the mains input module and the generator input module, and is used to select whether to be powered by the mains power supply or the backup power supply according to the control command.

10. The power distribution cabinet according to claim 9, characterized in that, Also includes: UPS input module, used to connect to an uninterruptible power supply; The UPS power supply switching module is connected to the mains input module, the backup power input module and the UPS input module, and is used to select whether to supply power to the load from the uninterruptible power supply or switch to supply power to the load from the main load circuit according to the control command.

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