Multi-input direct-current uninterruptible power supply

Abstract

The utility model relates to the technical field of direct-current uninterruptible power supplies, in particular to a multi-input direct-current uninterruptible power supply, which comprises a front-stage DCDC module, a rear-stage DCDC module and a remote switch module, and the rear end of the remote switch module is connected to the input end of a power distribution unit through a leakage current sensor; a communication port of the intelligent monitoring module is respectively connected to the front-stage DCDC module, the rear-stage DCDC module, the battery unit and the leakage current acquisition module; the leakage current acquisition module is connected to the leakage current sensor; according to the utility model, 1500V direct-current input is supported, the direct-current power supply is especially suitable for renewable energy source scenes such as large-scale photovoltaic and the like, the cable loss is effectively reduced, the overall energy transmission efficiency is improved, the output end of the direct-current power supply adopts a high-efficiency conversion technology, 400V direct-current voltage can be stably provided, and the direct-current power supply can be used for power supply. And high requirements of industrial and commercial users on power supply stability are met.

Description

Technical Field

[0001] This utility model relates to the field of DC uninterruptible power supply technology, and in particular to a multi-input DC uninterruptible power supply. Background Technology

[0002] With the continuous development of the information society, UPS (Uninterruptible Power Supply) systems have been widely used in information collection, transmission, processing, storage, and various information application scenarios, and their importance has become increasingly prominent with the improvement of information technology application. UPS technology is evolving towards higher efficiency, intelligence, modularity, and stronger environmental adaptability to better meet the growing demands for power continuity and stability in key power supply fields such as data centers, communication base stations, medical equipment, and industrial control systems. Especially against the backdrop of continuous informatization and industrialization, higher requirements are placed on the performance, reliability, energy efficiency, and intelligence level of UPS products. Modular UPS, due to its advantages such as flexible deployment, scalability, and ease of maintenance, has become an important choice for modern data center construction; while intelligent UPS, through functions such as remote monitoring, fault diagnosis, and energy efficiency management, improves system operation and maintenance efficiency and effectively reduces operation and maintenance costs.

[0003] Meanwhile, with the development of high-voltage direct current (HVDC) transmission technology, more and more critical equipment is placing increasingly stringent demands on the stability and reliability of power systems. DC UPS systems are beginning to play a vital role in power systems, especially in the event of mains power anomalies or failures, providing continuous and stable power to critical loads. However, existing DC UPS technology still has many shortcomings in terms of high-voltage input, system safety, and intelligent monitoring capabilities, necessitating new technological solutions to overcome these bottlenecks.

[0004] Traditional DC UPS systems typically employ a structure that includes energy storage devices and inverters. They consist of a rectifier, battery, inverter, and static switch, using 220V AC as the main power source and sealed lead-acid batteries as backup. Under normal mains power conditions, the UPS rectifies the AC mains power and supplies it to the load while simultaneously charging the battery; when the mains power is interrupted, it immediately switches to battery power. However, this type of system struggles to flexibly adapt to loads with different voltage levels, exhibiting poor adaptability. Furthermore, the traditional 220V AC design limits transmission distance, making it unsuitable for applications requiring long power supply distances.

[0005] Emerging infrastructure scenarios, such as intelligent transportation, present entirely new challenges to power supply and distribution systems. Their power supply characteristics are characterized by a linear power supply structure rather than a traditional mesh structure, placing higher demands on power supply distance, reliability, and the ability to continuously supply power to low-power loads. In traditional low-voltage systems, each subsystem deploys its own UPS, resulting in generally oversized designs, significant resource waste, and an inability to achieve inter-system redundancy. This not only increases investment and construction costs but also raises subsequent operation and maintenance costs. Existing DC UPS technology struggles to achieve a good balance between economy and security in emerging scenarios like intelligent transportation, and can no longer fundamentally meet their comprehensive power system requirements, urgently necessitating technological innovation and upgrades. Summary of the Invention

[0006] To address the aforementioned issues, this invention proposes a multi-input DC uninterruptible power supply (UPS) system. This system effectively improves the reliability and power quality of DC UPS through multi-input redundant power supply modes and multiple control methods, achieving a seamless power flow system. It ensures that the DC energy stored in the battery is directly supplied to connected devices, achieving a seamless and uninterrupted power flow, providing backup power for electrical systems, helping to ensure uninterrupted operation and protecting sensitive equipment from potential damage. By directly using DC power, it overcomes the shortcomings of traditional UPS systems in long-distance transmission, improves system reliability and efficiency, reduces power supply costs, solves the problem of the lack of integrated design in existing multi-channel DC UPS systems, improves the overall and integrated design level, and enhances system reliability.

[0007] This utility model is achieved through the following technical solution:

[0008] A multi-input DC uninterruptible power supply, comprising:

[0009] The input terminal of the pre-stage DC-DC module is connected to the corresponding high-voltage DC power input port, and the output terminal is connected to the input terminal of the subsequent DC-DC module.

[0010] The input of the post-stage DC-DC module is connected to the output of the corresponding pre-stage DC-DC module, and the output of the post-stage DC-DC module is connected in parallel to the front end of the battery cell and the remote switch module.

[0011] The remote switch module is connected to the input terminal of the power distribution unit via a leakage current sensor at its back end.

[0012] The intelligent monitoring module has its communication ports connected to the front-end DC-DC module, the rear-end DC-DC module, the battery unit, and the leakage current acquisition module, respectively.

[0013] The leakage current acquisition module is connected to the leakage current sensor;

[0014] The input terminal of the battery cell is connected to the output terminal of the subsequent DC-DC module.

[0015] Furthermore, there are multiple pre-stage DC-DC modules. The input terminal of each pre-stage DC-DC module is connected to the corresponding high-voltage DC power input port, and the output terminal is connected to the corresponding input terminal of the post-stage DC-DC module. There are multiple post-stage DC-DC modules. The input terminal of each post-stage DC-DC module is connected to the corresponding output terminal of the pre-stage DC-DC module, and the output terminal is connected in parallel to the front end of the battery unit and the remote switch module. The communication port of the intelligent monitoring module is connected to each pre-stage DC-DC module and each post-stage DC-DC module.

[0016] Furthermore, the input terminal of each pre-stage DC-DC module is independently connected to the corresponding high-voltage DC power input port, and the output terminal of each pre-stage DC-DC module is connected to the input terminal of the corresponding post-stage DC-DC module through an independent line.

[0017] Furthermore, the output of the subsequent DC-DC module is connected to the front end of the battery unit and the remote switch module via a parallel copper busbar, and the input of the parallel copper busbar is directly connected to the output of each subsequent DC-DC module.

[0018] Furthermore, the battery unit includes multiple sets of lithium iron phosphate battery modules, and the input terminal of each set of battery modules is connected to the output terminal of the subsequent DC-DC module through an independent line.

[0019] Furthermore, the communication port of the intelligent monitoring module is connected to the front-end DC-DC module via an RS485 bus, and the communication port of the intelligent monitoring module is connected to the rear-end DC-DC module via a CAN bus.

[0020] Furthermore, the insulation detection port of the intelligent monitoring module is connected to the copper busbar of the power distribution unit, and the input end of the copper busbar is connected to the output end of the subsequent DC-DC module.

[0021] Beneficial effects of the utility model:

[0022] (1) The present invention proposes a multi-input DC uninterruptible power supply that supports DC input up to 1500V, which is particularly suitable for large-scale photovoltaic and other renewable energy scenarios, effectively reducing cable loss and improving overall energy transmission efficiency. Its output end adopts high-efficiency conversion technology, which can stably provide 400V DC voltage, meeting the high requirements of industrial and commercial users for power supply stability;

[0023] (2) The multi-input DC uninterruptible power supply proposed in this utility model can quickly switch to the backup power supply when any power input fails, ensuring uninterrupted operation of the load, greatly improving the reliability and anti-interference capability of the system, and is particularly suitable for application environments with extremely high requirements for power supply continuity, such as data centers, hospitals and key transportation facilities.

[0024] (3) The multi-input DC uninterruptible power supply proposed in this utility model integrates an intelligent monitoring unit, which can collect operating parameters such as input / output voltage and current in real time, and has remote monitoring function, so that maintenance personnel can keep abreast of the system operation status at any time, give early warning of potential problems, and significantly improve the efficiency and safety of system management.

[0025] (4) The multi-input DC uninterruptible power supply proposed in this utility model also has leakage current monitoring function. It has a built-in leakage current sensor and acquisition module, which can monitor in real time and alarm and activate the protection mechanism in time when an abnormality is detected, thereby effectively preventing electrical fires and equipment damage caused by leakage. It is particularly suitable for scenarios with high electrical safety requirements, such as tunnels and data centers.

[0026] (5) The multi-input DC uninterruptible power supply proposed in this utility model has a complete multi-protection mechanism, including safety protection functions such as overvoltage, overcurrent, short circuit, insulation abnormality and excessive temperature rise, and can automatically resume operation after the fault is cleared, thereby enhancing the self-healing ability and operational stability of the system and improving the safety and reliability of the entire power supply system. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a system block diagram of a multi-input DC uninterruptible power supply proposed in this utility model;

[0029] Figure 2 This is a schematic diagram of the front-end DC-DC module circuit of a multi-input DC uninterruptible power supply proposed in this utility model;

[0030] Figure 3 This is a schematic diagram of the circuit of the downstream DC-DC module of a multi-input DC uninterruptible power supply proposed in this utility model.

[0031] Figure 4 The present invention proposes a device structure for a multi-input DC uninterruptible power supply. Figure 1 ;

[0032] Figure 5 The present invention proposes a device structure for a multi-input DC uninterruptible power supply. Figure 2 ;

[0033] Figure 6 The present invention proposes a device structure for a multi-input DC uninterruptible power supply. Figure 3 ;

[0034] Figure 7 The present invention proposes a device structure for a multi-input DC uninterruptible power supply. Figure 4 ;

[0035] Figure 8 The present invention proposes a device structure for a multi-input DC uninterruptible power supply. Figure 5 ;

[0036] Figure 9 The present invention proposes a device structure for a multi-input DC uninterruptible power supply. Figure 6 ;

[0037] Figure 10 The present invention proposes a device structure for a multi-input DC uninterruptible power supply. Figure 7 ;

[0038] In the diagram, 101-M12 lifting ring, 102-first lintel, 103-top cover plate, 104-fan mounting plate, 105-first L-front fixing piece, 106-bottom sealing plate, 107-second L-front fixing piece, 108-first base channel steel, 109-base plate, 110-first crossbar, 111-second crossbar, 112-power distribution beam, 113-support beam, 114-first sensor mounting plate, 115-first DC-DC support beam, 11 6-Output copper busbar mounting plate, 117-Second DC-DC support beam, 118-Third DC-DC support beam, 119-Power supply mounting plate, 120-Plastic housing mounting plate, 201-First power supply module mounting assembly, 202-Power supply module, 203-Fourth A power supply module mounting assembly, 204-Fourth B power supply module mounting assembly, 205-Third power supply module mounting assembly, 206-Second power supply module mounting assembly, 301-Second sensor mounting assembly Mounting plate, 302-Output copper busbar, 303-Second base channel steel, 304-Output circuit breaker, 305-Power supply module, 306-DCDC module, 307-DC circuit breaker, 308-Integrated control box, 309-Fan mounting plate, 310-Second door lintel, 311-Molded case circuit breaker, 401-Bottom mounting hole, 402-Inlet / outlet cable hole, 501-Top mounting hole, 502-Outlet air vent, 503-Inlet air vent, 504-Forklift hole 601-First cabinet reinforcing rib, 602-Second cabinet reinforcing rib, 603-First shielding plate, 604-Second shielding plate, 605-First battery baffle, 606-Second battery baffle, 607-Third cabinet reinforcing rib, 608-Fourth cabinet reinforcing rib, 609-Third base channel steel, 610-Fifth cabinet reinforcing rib, 611-Sixth cabinet reinforcing rib, 612-Battery support plate, 613-Third shielding plate, 614-Rack frame. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0040] Example 1

[0041] This embodiment proposes a specific implementation method for a multi-input DC uninterruptible power supply.

[0042] refer to Figure 1 A multi-input DC uninterruptible power supply includes a front-end DC-DC module 1#, a front-end DC-DC module 2#, a rear-end DC-DC module 1#, a rear-end DC-DC module 2#, an intelligent monitoring module, a remote switch module, a battery unit, a leakage current sensing module, a leakage current acquisition module, and a power distribution unit.

[0043] This uninterruptible power supply (UPS) converts the high-voltage 1500V DC voltage into a stable and usable 400V voltage through a pre-stage DC-DC module and a post-stage DC-DC module to power downstream equipment and charge the battery module. When the battery is fully charged, the system will automatically enter a float charge state to protect the battery.

[0044] The main function of the front-end module is to convert the 1200V to 1600V high-voltage DC power transmitted remotely by the central office power conversion device into an intermediate DC voltage through a single-stage step-down conversion. The intermediate DC voltage range can be adjusted between 600-750VDC. Furthermore, this module features overvoltage, overcurrent, and short-circuit protection, and has an independent display screen.

[0045] The main function of the back-end module is to convert the intermediate voltage converted by the front-end module to 300-400VDC. The module also has short-circuit protection, current sharing function, and LED warning function.

[0046] The intelligent monitoring module is responsible for real-time monitoring of the operating status of each module. In this embodiment, the intelligent monitoring module uses the STM32F407ZET6 chip as the control chip, and its functions include, but are not limited to, monitoring key parameters such as input voltage, output voltage, battery status, and temperature. Furthermore, this monitoring unit can exchange data with external systems via a communication interface to achieve remote monitoring and management. The system control module is responsible for coordinating the work of the monitoring unit and the leakage current detection circuit, and intelligently adjusting the operating status of each module based on the detection results to ensure stable system operation. Through precise control, the system control module ensures that each module provides a reliable and efficient power supply under various operating conditions.

[0047] The remote switching module, in this embodiment, can employ MOS switches, thyristor switches, solid-state relays, contactors, smart circuit breakers, etc., to provide protection against short circuits, overcurrent, overloads, and overtemperature for the power supply line. It can also promptly shut off or close based on remote switching commands and provide feedback on the current operating status.

[0048] The battery unit is an energy storage backup battery. The energy storage backup battery can be a lead-acid battery or a lithium battery module. The voltage level can be adjusted between 300-400VDC. There can be multiple backup batteries, and multiple battery groups can be switched for power supply at will.

[0049] The leakage current detection function includes a leakage current sensing module and a leakage current acquisition module. In this embodiment, the leakage current sensing module uses the AHLC-EB chip, and the leakage current acquisition module uses the ARTU100-KT8 / MA84+MPOW, which integrates a leakage current detection circuit. This circuit includes multiple input power lines, each with a leakage current sensor connected in series to measure the total leakage current of all shunt systems. If the detected actual leakage current value exceeds the preset standard leakage current value, the control unit will instruct the relay to disconnect the circuit to ensure system safety.

[0050] Further explanation of the device's connection method:

[0051] The 1200V to 1600V high-voltage DC power supply #1, transmitted remotely, is connected to the input port of the pre-stage DC-DC module #1 via a wire. The output of the pre-stage DC-DC module #1 is connected to the input of the subsequent DC-DC module #1 via a wire.

[0052] The 1200V to 1600V high-voltage DC power supply #2 is transmitted remotely and connected to the input port #2 of the pre-stage DC-DC module via a wire. The output of the pre-stage DC-DC module #2 is connected to the input of the subsequent DC-DC module #2 via a wire.

[0053] The 1200V to 1600V high-voltage DC power N# transmitted remotely is connected to the input port N# of the pre-amplifier DC-DC module via a wire, and the output of the pre-amplifier DC-DC module N# is connected to the input of the subsequent DC-DC module N# via a wire.

[0054] The outputs of the post-stage DC-DC module 1#, post-stage DC-DC module 2#, and post-stage DC-DC module N# are connected in parallel and then connected to the front end of the battery unit and the remote switch module.

[0055] The remote switch module's back end is connected to the power distribution unit's input via a wire passing through the leakage current sensor. The remote switch module's feedback terminal is connected to the intelligent monitoring module's feedback terminal via a wire, and the remote switch module's control terminal is connected to the intelligent monitoring module's control terminal via a wire.

[0056] The 24V DC power converted by the switching power supply is connected via wires to the input terminals of the intelligent monitoring module, leakage current collector, and pre-amplifier DC-DC modules 1, 2, and N. The communication terminals of the pre-amplifier DC-DC modules, the power-to-voltage DC-DC module, and the battery unit are connected via wires to the communication terminal of the intelligent monitoring module. The intelligent monitoring module uploads data to the cloud control platform via a 4G / 5G communication network. The output terminal of the leakage current collector is connected via wires to the input terminal of the leakage current sensor, and the communication terminal of the leakage current sensor is connected to the communication acquisition terminal of the leakage current collector.

[0057] Example 2

[0058] This embodiment proposes a specific functional principle of a multi-input DC uninterruptible power supply based on embodiment 1.

[0059] refer to Figure 2 The system includes two pre-amplifier DC-DC modules, #1 and #2, which step down high input voltages (1200V~1600V) to lower output voltages (600V~750V). Its operation is based on high-frequency switching technology and pulse-width modulation (PWM) control, achieving efficient voltage conversion through the interaction of energy storage elements (inductors and capacitors) and switching elements (IGBTs). Furthermore, the module features comprehensive protection functions, including overvoltage, overcurrent, and short-circuit protection, which automatically triggers upon detecting abnormal voltage or current to ensure circuit safety and prevent damage. For easy real-time monitoring and maintenance, the module also features a dedicated display screen showing key operating parameters such as voltage and current, providing a clear overview of the system status and facilitating timely adjustments and responses to potential problems.

[0060] refer to Figure 3 The system includes two DC-DC modules, #1 and #2, which utilize high-frequency switching technology, PWM control, isolation transformers, and output filtering to achieve efficient voltage conversion from the input voltage (600V~750V) to a stable output voltage (300V~400V). To ensure circuit safety, the modules automatically activate protection mechanisms, including current limiting or output suspension, once a short circuit is detected at the output, until the short circuit is resolved. When the modules operate in parallel, their current sharing function ensures that the load is evenly distributed among multiple modules, preventing any single module from being damaged due to overheating or overload, thereby improving the overall system efficiency and stability. Furthermore, the modules are equipped with LED indicators to display the real-time operating status. In case of overheating, overload, or short circuit, the LED warning lights will illuminate, reminding operators to perform timely maintenance or repair. To enhance system safety and reliability and reduce the risk of fault propagation, the modules also provide electrical isolation between the input and output. This design not only ensures efficient power conversion but also provides a solid guarantee for stable system operation.

[0061] The intelligent monitoring module is used to monitor the real-time operating status of each module, including but not limited to key parameters such as input voltage, output voltage, battery status, and temperature. Furthermore, the intelligent monitoring module can exchange data with external systems via a communication interface to achieve remote monitoring and management. It is also responsible for coordinating the work of the monitoring unit and leakage current detection circuit, and intelligently adjusting the operating status of each module based on the detection results to ensure stable system operation. Through precise control, it ensures that each module provides a reliable and efficient power supply under various operating conditions.

[0062] The remote switch module uses a high-voltage contactor containing an electromagnetic coil. When the coil is energized, current flows through it, generating an electromagnetic field that attracts the moving contact to the stationary contact, closing the circuit. When the coil is de-energized, the electromagnetic field disappears, and the moving contact returns to its original position under the action of a spring, breaking the circuit. It provides protection against short circuits, overcurrent, overload, and overtemperature for the power supply line. Furthermore, it can promptly shut off or close based on remote switch commands and provide feedback on the current operating status.

[0063] The battery unit is an energy storage backup battery, which is a lithium iron phosphate battery module with an adjustable voltage level between 300-400VDC. There are multiple backup batteries, and the power supply and distribution can be switched freely between these multiple battery groups.

[0064] The leakage current detection module includes a leakage current sensor and a leakage current acquisition unit. The leakage current sensor, through electromagnetic induction and magnetic modulation technology, accurately detects leakage current in the circuit and converts it into a standard signal output. The integrated leakage current detection circuit contains multiple input power lines, each with a leakage current sensor connected in series to measure the sum of leakage currents in all shunt systems. If the detected actual leakage current value exceeds a preset standard leakage current value, the intelligent monitoring module will instruct the high-voltage contactor to disconnect the circuit to ensure system safety.

[0065] Further explanation of the device connection method:

[0066] The positive terminal of the remotely transmitted 1200V to 1600V high-voltage DC power supply 1# is connected to the positive input port IN+ of the pre-stage DC-DC module 1# via a wire, and the negative terminal of the remotely transmitted 1200V to 1600V high-voltage DC power supply 1# is connected to the negative input port IN- of the pre-stage DC-DC module 1# via a wire.

[0067] The 600V positive output port OUT+ of the pre-stage DC-DC module 1# is connected to the positive input port IN+ of the post-stage DC-DC module# via a wire, and the 600V negative output port OUT- of the pre-stage DC-DC module 1# is connected to the negative input port IN+ of the post-stage DC-DC module# via a wire.

[0068] The positive terminal of the remotely transmitted 1200V to 1600V high-voltage DC power supply #2 is connected to the positive input port IN+ of the pre-stage DC-DC module #2 via a wire, and the negative terminal of the remotely transmitted 1200V to 1600V high-voltage DC power supply #2 is connected to the negative input port IN- of the pre-stage DC-DC module #2 via a wire.

[0069] The 600V positive output port OUT+ of the pre-stage DC-DC module 2# is connected to the positive input port IN+ of the post-stage DC-DC module 2# via a wire, and the 600V negative output port OUT- of the pre-stage DC-DC module 2# is connected to the negative input port IN- of the post-stage DC-DC module 2# via a wire.

[0070] The 375V positive output port OUT+ of the downstream DC-DC module 1# is connected to the positive output port OUT+ of the downstream DC-DC module 2# via a wire, and the 400V negative output port OUT- of the downstream DC-DC module 1# is connected to the negative output port OUT- of the downstream DC-DC module 2# via a wire.

[0071] The 375V output port OUT+ / OUT- of the power DC-DC module 2# is connected to the IN+ / IN- of the battery unit BMU.

[0072] The 375V output port OUT+ of the downstream DC-DC module 2# is connected to the input port IN of the remote switch module via a wire.

[0073] The 375V output port OUT- of the downstream DC-DC module 2# is connected to the copper busbar M- via a wire, and the output port OUT of the remote switch module is connected to the copper busbar M+.

[0074] The copper busbars M+ / M- are connected to the input ports IN+ / IN- of each power distribution unit via wires passing through the leakage current sensor.

[0075] The feedback ports A1 / A2 of the remote switch module are connected to the ports IO1 / IO2 of the intelligent monitoring module via wires, and the control ports C1 / C2 of the remote switch module are connected to the control ports IO9 / IO10 of the intelligent monitoring module via wires.

[0076] The OUT+ / OUT- DC 24V output port of the switching power supply is connected to the power input terminals IN+ / IN- of the intelligent monitoring module, the power input terminals IN+ / IN- of the leakage current collector, the auxiliary power input terminals IN+ / IN- of the pre-amplifier DC-DC module 1#, and the auxiliary power input terminals IN+ / IN- of the pre-amplifier DC-DC module 2# via wires.

[0077] The communication ports of the pre-amplifier DC-DC module 1 (RS485A / RS485B) are connected to the communication ports IO3 / IO4 of the intelligent monitoring module via wires. The communication ports of the pre-amplifier DC-DC module 2 (RS485A / RS485B) are also connected to the communication ports IO3 / IO4 of the intelligent monitoring module via wires.

[0078] The communication ports CANH / CANL of the downstream DC-DC module 1 are connected to the communication ports IO5 / IO6 of the intelligent monitoring module via wires. The communication ports CANH / CANL of the downstream DC-DC module 2 are also connected to the communication ports IO5 / IO6 of the intelligent monitoring module via wires.

[0079] The communication ports RS485A / RS485B of the battery unit are connected to the communication ports IO7 / IO8 of the intelligent monitoring module via wires.

[0080] The copper busbars M+ / M- are connected to the insulation detection ports IO11 / IO12 of the intelligent monitoring module via wires.

[0081] The intelligent monitoring module uploads data to the cloud control platform via 4G / 5G communication networks.

[0082] The output ports OUT+ / OUT- of the leakage current collector are connected to the power input ports IN+ / IN- of each leakage current sensor via wires. The communication ports RS485A / RS485B of each leakage current sensor are connected to the communication ports RS485A / RS485B of the leakage current collector.

[0083] Example 3

[0084] This embodiment proposes a device structure for a multi-input DC uninterruptible power supply based on Embodiment 1.

[0085] refer to Figures 4-10 A multi-input DC uninterruptible power supply device consists of two parts: a battery cabinet and a DC cabinet.

[0086] The DC cabinet is a 2250mm high, 800mm wide, and 800mm deep cabinet consisting of cabinet assembly, front door assembly, and rear door assembly.

[0087] The cabinet assembly consists of vertical frame sides, slotted frame sides, upper and lower frame sides, first horizontal bar 110, second horizontal bar 111, first L-shaped front fixing component 105, second L-shaped front fixing component 107, power distribution beam 112, support beam 113, first DC-DC support beam 115, second DC-DC support beam 117, third DC-DC support beam 118, output copper busbar mounting plate 116, sensor mounting plate 114, power supply mounting plate 119, power supply module mounting box, mounting bracket-1, mounting bracket-2, plastic shell mounting plate 120, front baffle, top cover plate 103, bottom plate 109, bottom sealing plate 106, left side plate, right side plate, first door lintel 102, and first base channel steel 108.

[0088] The vertical frame edge of the cabinet combination is a "Z"-shaped bending part formed by bending a sheet metal part. The two bending edges of the "Z"-shaped bending part are of different lengths. The longer bending edge is bent a second time to form a dead fold. A certain number of rectangular holes and round holes with equal spacing are opened on the longer bending edge and the adjacent surface for the installation of other parts.

[0089] The clamping groove frame edge of the cabinet combination is a "Z"-shaped bending part formed by bending a sheet metal part. The two bending edges of the "Z"-shaped bending part are of different lengths. The long edge is bent inward 90° twice and then bent outward 90° once, and finally bent inward 90° once. The bending edge after the fourth bending is parallel and equal in length to the "Z"-shaped bending part. A certain number of rectangular holes and square holes with equal spacing are opened on this bending surface, its adjacent bending surface, and the corresponding bending surface of the "Z" shape.

[0090] The upper and lower frame edges of the cabinet combination are "Z"-shaped bending parts formed by bending a sheet metal part. The two bending edges of the "Z"-shaped bending part are of different lengths. The longer bending edge is bent a second time to form a dead fold. A certain number of rectangular holes and round holes with equal spacing are opened on the longer bending edge and the adjacent surface, and large rectangular holes are opened on both sides for the door lock rod to insert. A notch is opened on the short bending edge of the "Z"-shaped bending part for convenient welding.

[0091] The first crossbar 110 and the second crossbar 111 of the cabinet combination are both "匚"-shaped bending parts formed by bending the two sides of the sheet metal upward 90°. There is a certain distance from the side of the bending edge to both sides. The bottom surface of the first crossbar 110 is shorter than the bottom surface of the second crossbar 111.

[0092] The support beam 113, the power distribution crossbeam 112, the first DCDC support beam 115, the second DCDC support beam 117, the third DCDC support beam 118, the output copper bar mounting plate 116, the sensor mounting plate 114, and the power supply mounting plate 119 of the cabinet combination are all formed by bending the four sides of the sheet metal upward 90° to form a semi-closed cavity. Fixing holes for corresponding installation parts are opened on their respective bottom surfaces, and press rivet nuts are riveted on the back for convenient installation and fixation.

[0093] The first L-shaped front fixing part 105 and the second L-shaped front fixing part 107 of the cabinet combination are a pair of symmetrical "L"-shaped bending parts. A certain number of round holes are opened on the long side, and the positions of the round holes correspond to the fixed front baffle. Press rivet nuts are riveted on the back of the round holes for convenient installation of the front baffle.

[0094] The power supply module installation box in the cabinet combination is composed of the first power supply module installation component 201, the second power supply module installation component 206, the third power supply module installation component 205, the fourth A power supply module installation component 203, and the fourth B power supply module installation component 204.

[0095] The first power supply module installation component 201 is a "C"-shaped bending part formed by bending the two sides of a sheet metal part upwards at 90°. The two sides of the bent edges are bent outwards at 90° to form hanging ears, and a rectangular notch is opened on the side of the bottom surface of the bending part;

[0096] The second power supply module installation component 206 is a semi-closed cavity formed by bending the four sides of a sheet metal part upwards at 90°. A plurality of rectangular holes are opened on the bottom surface of the bending part for ventilation of the power supply module 202 and fixing the wiring terminals of the power supply module 202. Round holes are opened on the four bent surfaces and riveted with riveted nuts;

[0097] The third power supply module installation component 205 is a rectangular sheet metal part with countersunk holes for corresponding installation on the surface;

[0098] The fourth A power supply module installation component 203 and the fourth B power supply module installation component 204 are a pair of symmetrical sheet metal parts, which are semi-closed cavities formed by bending the four sides of the sheet metal upwards at 90°;

[0099] The top cover plate 103 and the bottom plate 109 of the cabinet combination are both "C"-shaped bending parts formed by bending the two sides of a sheet metal part upwards at 90°, and then the two bent edges are bent outwards at 90°; In addition, a large rectangular hole is opened on the bottom surface of the bottom plate 109, and four round holes are opened around it;

[0100] The bottom sealing plate 106 of the cabinet combination is a "C"-shaped bending part formed by bending a sheet metal box at 90°, and two rows of inlet and outlet holes 402 are opened on the bottom surface. The holes have the same size and the same spacing;

[0101] The plastic shell mounting plate 120 of the cabinet combination is a "Z"-shaped bending part formed by bending a sheet metal part, and then bent upwards at 9° on the four side surfaces, and corresponding mounting holes are opened on the bottom surface;

[0102] The first lintel 102 of the cabinet combination is composed of an "L"-shaped bending part and a first lintel head welded together; Two round holes are opened on both surfaces of the "L"-shaped bending part for installing and fixing the cabinet;

[0103] The first base channel steel 108 of the cabinet combination is composed of channel steel and channel steel support angle plates welded together.

[0104] The left side plate and the right side plate of the cabinet combination are a pair of symmetrical sheet metal parts, both of which are "C"-shaped bending parts formed by bending the two sides of the sheet metal upwards at 90°, and then bending one side outwards at 90°;

[0105] The front door assembly and the rear door assembly are composed of a front door panel, a rear door panel, a first reinforcing rib, a second reinforcing rib, a third reinforcing rib, a lock rod limiting frame, a door lock rod, and a door bottom lock rod;

[0106] The front door panel and the rear door panel are both semi-closed cavities formed by bending the four sides of the sheet metal upward at 90°. Corresponding round holes are opened on the bottom surface for welding studs to fix the lock rod limiting bracket and the door lock fixing holes; the front door panel has more air inlets and outlets than the rear door panel.

[0107] The first reinforcing rib, the second reinforcing rib, and the third reinforcing rib are all "匚"-shaped bending parts formed by bending the two sides of the sheet metal upward at 90°. Chamfers are cut at the connection of the first reinforcing rib and the second reinforcing rib, and they are welded to the door panel through the welding process. The connection of the reinforcing ribs is also fixed by spot welding.

[0108] The lock rod limiting bracket is a sheet metal part formed by bending the four sides of the sheet metal upward at 90°. Two opposite long bending sides are bent outward at 90°, and mounting holes are opened on the bending surface.

[0109] The battery cabinet is a cabinet with a height of 2250 mm, a width of 800 mm, and a depth of 800 mm, consisting of a front door assembly and a cabinet body.

[0110] The cabinet body of the battery cabinet consists of a second lintel 301, a second base channel steel 303, a cabinet frame 614, a first cabinet body reinforcing rib 601, a second cabinet body reinforcing rib 602, a third cabinet body reinforcing rib 607, a fourth cabinet body reinforcing rib 608, a fifth cabinet body reinforcing rib 610, a sixth cabinet body reinforcing rib 611, a battery support plate 612, a first battery baffle 605, a second battery baffle 606, a first shielding plate 603, a second shielding plate 604, and a third shielding plate 613.

[0111] The second lintel 301 of the cabinet body is composed of an "L"-shaped sheet metal part and a second lintel head welded together; two round holes are opened on the "L"-shaped sheet metal part for fixing the cabinet body at the top.

[0112] The second base channel steel 303 of the cabinet body is composed of a channel steel and a channel steel support angle plate welded together.

[0113] The cabinet frame 614 of the cabinet body is a semi-closed cavity formed by bending and welding sheet metal parts. The two sides of the sheet metal part are bent upward at 90° and then bent inward at 90° for the second time.

[0114] The first cabinet body reinforcing rib 601, the second cabinet body reinforcing rib 602, the third cabinet body reinforcing rib 607, the fourth cabinet body reinforcing rib 608, the fifth cabinet body reinforcing rib 610, and the sixth cabinet body reinforcing rib 611 of the cabinet body are all "匚"-shaped bending parts formed by bending the two sides of the sheet metal part upward at 90°.

[0115] The battery support plate 612 of the cabinet body is an "L"-shaped sheet metal part formed by bending the sheet metal part.

[0116] The first battery baffle 605 and the second battery baffle 606 of the cabinet body are "C"-shaped bending parts formed by bending the two sides of a sheet metal part upward by 90°. Then, a second 90° outward bend is performed to fold out a small support leg, and fixing holes are drilled in the folded support leg. The bottom surface of the first battery baffle 605 is wider than the bottom surface of the second battery baffle 606.

[0117] The shielding baffle -4, the second shielding baffle 604, and the third shielding baffle 613 of the cabinet body are all "L"-shaped bending parts formed by bending a sheet metal part.

[0118] The front door assembly of the battery cabinet is composed of a door panel, a first reinforcing rib of the door panel, and a second reinforcing rib of the door panel.

[0119] The door panel is a semi-closed cavity formed by bending the four sides of a sheet metal part upward by 90°. Lock installation holes, 16mm lamp installation holes, and emergency stop button installation holes are drilled in the door panel.

[0120] Both the first reinforcing rib of the door panel and the reinforcing rib of the door panel are "C"-shaped bending parts formed by bending the two sides of a sheet metal part upward by 90°. Through the welding process, they are welded to the door panel, and the connection of the reinforcing ribs is fixed by spot welding.

[0121] The above shows and describes the basic principles, main features, and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A multi-input DC uninterruptible power supply, characterized in that, include: The input terminal of the pre-stage DC-DC module is connected to the corresponding high-voltage DC power input port, and the output terminal is connected to the input terminal of the subsequent DC-DC module. The input of the post-stage DC-DC module is connected to the output of the corresponding pre-stage DC-DC module, and the output of the post-stage DC-DC module is connected in parallel to the front end of the battery cell and the remote switch module. The remote switch module is connected to the input terminal of the power distribution unit via a leakage current sensor at its back end. The intelligent monitoring module has its communication ports connected to the front-end DC-DC module, the rear-end DC-DC module, the battery unit, and the leakage current acquisition module, respectively. The leakage current acquisition module is connected to the leakage current sensor; The input terminal of the battery cell is connected to the output terminal of the subsequent DC-DC module.

2. The multi-input DC uninterruptible power supply according to claim 1, characterized in that, There are multiple pre-stage DC-DC modules. The input terminal of each pre-stage DC-DC module is connected to the corresponding high-voltage DC power input port, and the output terminal is connected to the corresponding input terminal of the post-stage DC-DC module. There are multiple post-stage DC-DC modules. The input terminal of each post-stage DC-DC module is connected to the corresponding output terminal of the pre-stage DC-DC module, and the output terminal is connected in parallel to the front end of the battery unit and the remote switch module. The communication port of the intelligent monitoring module is connected to each pre-stage DC-DC module and each post-stage DC-DC module.

3. The multi-input DC uninterruptible power supply according to claim 2, characterized in that, The input terminals of each pre-stage DC-DC module are independently connected to the corresponding high-voltage DC power input port, and the output terminals of each pre-stage DC-DC module are connected to the input terminals of the corresponding post-stage DC-DC module via independent lines.

4. The multi-input DC uninterruptible power supply according to claim 2, characterized in that, The output of the downstream DC-DC module is connected to the front end of the battery unit and the remote switch module via a parallel copper busbar, and the input of the parallel copper busbar is directly connected to the output of each downstream DC-DC module.

5. A multi-input DC uninterruptible power supply according to claim 2, characterized in that, The battery unit includes multiple sets of lithium iron phosphate battery modules, and the input of each set of battery modules is connected to the output of the subsequent DC-DC module through an independent line.

6. A multi-input DC uninterruptible power supply according to claim 2, characterized in that, The communication port of the intelligent monitoring module is connected to the front-end DC-DC module via an RS485 bus, and the communication port of the intelligent monitoring module is connected to the rear-end DC-DC module via a CAN bus.

7. A multi-input DC uninterruptible power supply according to claim 1, characterized in that, The insulation detection port of the intelligent monitoring module is connected to the copper busbar of the power distribution unit, and the input end of the copper busbar is connected to the output end of the subsequent DC-DC module.

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