Uninterruptible power supply system

Abstract

The utility model relates to an uninterruptible power supply system of a power system, which comprises a first power supply cabinet, a second power supply cabinet, an output switch circuit and a feeder line cabinet, and is characterized in that the output switch circuit comprises an anti-countercurrent diode module; the first input end of the first power supply cabinet is electrically connected with a first power supply, the second input end of the first power supply cabinet is electrically connected with a second power supply, and the output end of the first power supply cabinet is electrically connected with the first input end of the anti-countercurrent diode module; the input end of the second power supply cabinet is electrically connected with a third power supply, and the output end of the second power supply cabinet is electrically connected with the second input end of the anti-countercurrent diode module; and the output end of the anti-countercurrent diode module is electrically connected with the feeder line cabinet. Through the arrangement, the uninterruptible power supply system can cope with different working conditions, and meanwhile, the anti-reflux diode module is arranged, so that the damage of power reflux to the uninterruptible power supply system is avoided, and the stability and the reliability of the uninterruptible power supply system are improved.

Description

Technical Field

[0001] This application relates to the field of power system technology, and in particular to an uninterruptible power supply system. Background Technology

[0002] An uninterruptible power supply (UPS) is a device that provides backup power. It can immediately provide power to connected devices when the main power supply fails, ensuring the stable operation of critical equipment and data integrity in environments with unstable power supply or critical mission requirements. However, UPS systems can only provide power for short periods, which is insufficient to cope with prolonged power outages, resulting in reliability issues. Utility Model Content

[0003] To address the aforementioned technical problems, this application provides an uninterruptible power supply system.

[0004] This application provides an uninterruptible power supply system, characterized in that it includes: a first power supply cabinet, a second power supply cabinet, an output switching circuit, and a feeder cabinet, wherein the output switching circuit includes an anti-reverse current diode module;

[0005] The first input terminal of the first power supply cabinet is electrically connected to the first power supply, the second input terminal of the first power supply cabinet is electrically connected to the second power supply, and the output terminal of the first power supply cabinet is electrically connected to the first input terminal of the anti-reverse current diode module.

[0006] The input terminal of the second power supply cabinet is electrically connected to the third power supply, and the output terminal of the second power supply cabinet is electrically connected to the second input terminal of the anti-reverse current diode module.

[0007] The output terminal of the anti-reverse current diode module is electrically connected to the feeder cabinet.

[0008] Optionally, the output switching circuit further includes a first switch and a second switch;

[0009] The output terminal of the second power supply cabinet is electrically connected to the second input terminal of the anti-reverse current diode module through the first switch; the output terminal of the anti-reverse current diode module is electrically connected to the feeder cabinet through the second switch.

[0010] Optionally, the output switching circuit further includes a third switch;

[0011] The output terminal of the second power supply cabinet is electrically connected to the feeder cabinet through the third switch.

[0012] Optionally, the first power supply cabinet includes a rectifier and an inverter;

[0013] The input terminal of the rectifier is electrically connected to the first power supply, the output terminal of the rectifier is electrically connected to the inverter, and the output terminal of the inverter is electrically connected to the first input terminal of the anti-reverse current diode module.

[0014] The second power source is connected at the connection point between the rectifier and the inverter.

[0015] Optionally, the first power supply cabinet may further include a first isolation transformer and / or a second isolation transformer;

[0016] The input terminal of the first isolation transformer is connected to the first power supply, and the output terminal of the first isolation transformer is electrically connected to the input terminal of the rectifier.

[0017] The output terminal of the inverter is electrically connected to the input terminal of the second isolation transformer, and the output terminal of the second isolation transformer is electrically connected to the first input terminal of the anti-reverse current diode module.

[0018] Optionally, the first power supply cabinet further includes a filter;

[0019] The input terminal of the filter is electrically connected to the output terminal of the first isolation transformer, and the output terminal of the filter is electrically connected to the input terminal of the rectifier.

[0020] Optionally, the first power supply cabinet may further include a fourth switch and / or a fifth switch;

[0021] The input terminal of the first isolation transformer is connected to the first power source via the fourth switch;

[0022] The connection point between the rectifier and the inverter is electrically connected to the second power source via the fifth switch.

[0023] Optionally, the second power supply cabinet includes a third isolation transformer;

[0024] The input terminal of the third isolation transformer is electrically connected to the third power supply, and the output terminal of the third isolation transformer is electrically connected to the second input terminal of the anti-reverse current diode module.

[0025] Optionally, the second power supply cabinet may also include a sixth switch;

[0026] The input terminal of the third isolation transformer is electrically connected to the third power supply via the sixth switch.

[0027] Optionally, the second power supply cabinet may also include a voltage regulator;

[0028] The input terminal of the voltage regulator is electrically connected to the output terminal of the third isolation transformer, and the output terminal of the voltage regulator is electrically connected to the second input terminal of the anti-reverse current diode module.

[0029] The technical solution provided in this application has the following advantages compared with the prior art:

[0030] The uninterruptible power supply (UPS) system provided in this application includes: a first power supply cabinet, a second power supply cabinet, an output switching circuit, and a feeder cabinet. The output switching circuit includes an anti-reverse current diode module. The first input terminal of the first power supply cabinet is electrically connected to a first power supply, the second input terminal of the first power supply cabinet is electrically connected to a second power supply, and the output terminal of the first power supply cabinet is electrically connected to the first input terminal of the anti-reverse current diode module. The input terminal of the second power supply cabinet is electrically connected to a third power supply, and the output terminal of the second power supply cabinet is electrically connected to the second input terminal of the anti-reverse current diode module. The output terminal of the anti-reverse current diode module is electrically connected to the feeder cabinet. With this configuration, the feeder cabinet is powered by the first power supply under normal operating conditions, by the second power supply under fault conditions, and by the third power supply under maintenance conditions. This allows the UPS system to cope with different operating conditions, improving its stability and reliability. Simultaneously, the inclusion of the anti-reverse current diode module prevents power backflow from damaging the UPS system, further enhancing its stability and reliability. Attached Figure Description

[0031] 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.

[0032] 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.

[0033] Figure 1 A schematic diagram of an uninterruptible power supply system provided in an embodiment of this application;

[0034] Figure 2 A schematic diagram of another uninterruptible power supply system provided in the embodiments of this application;

[0035] Figure 3 A schematic diagram of another uninterruptible power supply system provided in the embodiments of this application;

[0036] Figure 4 A schematic diagram of another uninterruptible power supply system provided in the embodiments of this application;

[0037] Figure 5 A schematic diagram of another uninterruptible power supply system provided in the embodiments of this application;

[0038] Figure 6 A schematic diagram of another uninterruptible power supply system provided in the embodiments of this application;

[0039] Figure 7 A schematic diagram of another uninterruptible power supply system provided in the embodiments of this application;

[0040] Figure 8 A schematic diagram of another uninterruptible power supply system provided in the embodiments of this application;

[0041] Figure 9 A schematic diagram of another uninterruptible power supply system provided in the embodiments of this application;

[0042] Figure 10 This is a schematic diagram of another uninterruptible power supply system provided in an embodiment of this application.

[0043] Among them, 100 is the uninterruptible power supply system; 1 is the first power supply cabinet; 11 is the rectifier; 12 is the inverter; 13 is the first isolation transformer; 14 is the second isolation transformer; 15 is the filter; 16 is the fourth switch; 17 is the fifth switch; 2 is the second power supply cabinet; 21 is the third isolation transformer; 22 is the sixth switch; 23 is the voltage regulator; 3 is the output switch circuit; 31 is the anti-reverse current diode module; 32 is the first switch; 33 is the second switch; 34 is the third switch; 4 is the feeder cabinet. Detailed Implementation

[0044] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0045] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0046] The uninterruptible power supply system provided in this application will be described exemplarily below with reference to the accompanying drawings.

[0047] The uninterruptible power supply system provided in this application is used to supply power to the main computer room, thereby achieving uninterrupted power supply to the main computer room.

[0048] In some embodiments, such as Figure 1As shown, the uninterruptible power supply system 100 includes: a first power supply cabinet 1, a second power supply cabinet 2, an output switching circuit 3, and a feeder cabinet 4.

[0049] In this system, the first input terminal a of the first power supply cabinet 1 is connected to the first power supply 201, the second input terminal b of the first power supply cabinet 1 is connected to the second power supply 202, the output terminal of the first power supply cabinet 1 is electrically connected to the first input terminal e of the output switch circuit 3, and the output terminal g of the output switch circuit 3 is electrically connected to the feeder cabinet 4. The feeder cabinet 4 is used to connect the uninterruptible power supply system 100 to the load and is responsible for distributing electrical energy to different loads.

[0050] The input terminal h of the second power supply cabinet 2 is electrically connected to the third power supply 203, and the output terminal i of the second power supply cabinet 2 is electrically connected to the second input terminal f of the output switch circuit 3.

[0051] The first power source 201 is an AC power source, used to input AC power into the uninterruptible power supply system 100. The second power source 202 is a DC power source (e.g., a battery), used to input DC power into the uninterruptible power supply system 100. The third power source 203 is an AC power source, used to input AC power into the uninterruptible power supply system 100. The first power source 201 and the third power source 203 are located in different power supply circuits. For example, the first power source 201 is a 380V AC power source, the second power source 202 is a 220V DC power source, and the third power source is a 380V AC power source.

[0052] In this embodiment, the uninterruptible power supply (UPS) system is configured as follows: under normal operating conditions, the first power supply 201 supplies power to the feeder cabinet 4; under fault conditions, the second power supply 202 supplies power to the feeder cabinet; and under maintenance conditions, the third power supply 203 supplies power to the feeder cabinet 4. By switching between different power supplies to power the feeder cabinet 4 for different operating scenarios, power supply interruptions caused by the complexity of the power grid or external factors are avoided, thereby improving the stability and reliability of the UPS system.

[0053] In some embodiments, such as Figure 2 As shown, in the uninterruptible power supply system 100, the output switch circuit 3 includes an anti-reverse current diode module 31; the first input terminal a of the first power supply cabinet 1 is electrically connected to the first power supply 201, the second input terminal b of the first power supply cabinet 1 is electrically connected to the second power supply 202, and the output terminal c of the first power supply cabinet 1 is electrically connected to the first input terminal e of the anti-reverse current diode module 31; the input terminal h of the second power supply cabinet 2 is electrically connected to the third power supply 203, and the output terminal i of the second power supply cabinet 2 is electrically connected to the second input terminal f of the anti-reverse current diode module 31; the output terminal g of the anti-reverse current diode module 31 is electrically connected to the feeder cabinet 4.

[0054] In this embodiment, the anti-reverse current diode module 31 has unidirectional conductivity, which can prevent current from flowing in the opposite direction and avoid damage to the uninterruptible power supply system 100 caused by power backflow, thereby improving the stability and reliability of the uninterruptible power supply system 100. At the same time, when the second power supply 202 is fully charged, the anti-reverse current diode module 31 can prevent current from continuing to flow into the second power supply 202, avoiding waste of power resources.

[0055] When the uninterruptible power supply system 100 switches power for different operating conditions, it may generate instantaneous high voltage or high current. The anti-reverse current diode module 31 can cut off the abnormal current path in time, ensuring the safety of the uninterruptible power supply system 100.

[0056] In some embodiments, such as Figure 3 As shown, the output switch circuit 3 also includes a first switch 32 and a second switch 33; the output terminal i of the second power supply cabinet 2 is electrically connected to the second input terminal f of the anti-reverse current diode module 31 through the first switch 32; the output terminal g of the anti-reverse current diode module 31 is electrically connected to the feeder cabinet 4 through the second switch 33.

[0057] In some embodiments, such as Figure 4 As shown, the output switch circuit 3 also includes a third switch 34; the output terminal i of the second power supply cabinet 2 is electrically connected to the feeder cabinet 4 through the third switch 34.

[0058] Specifically, when the first switch 32 and the second switch 33 are in the connected state, the third switch 34 is in the disconnected state; when the first switch 32 and the second switch 33 are in the disconnected state, the third switch 34 is in the connected state.

[0059] In this embodiment, the circuit containing the anti-reverse diode module 31, the first switch 32, and the second switch 33 is the first output switch circuit, and the circuit containing the third switch 34 is the second output switch circuit. The first output switch circuit and the second output switch circuit are connected in parallel.

[0060] In some embodiments, such as Figure 5 As shown, the first power supply cabinet 1 includes a rectifier 11 and an inverter 12; the input terminal of the rectifier 11 is electrically connected to the first power supply 201, the output terminal of the rectifier 11 is electrically connected to the inverter 12, and the output terminal of the inverter 12 is electrically connected to the first input terminal e of the anti-reverse current diode module 31; the second power supply 202 is connected to the connection point between the rectifier 11 and the inverter 12.

[0061] The rectifier 11 includes, but is not limited to, a half-wave rectifier, a full-wave rectifier, and a bridge rectifier. The rectifier 11 can also be integrated with other circuits (such as the inverter 12). This utility model is not limited to the specific embodiments described above.

[0062] The rectifier 11 converts alternating current (AC) to direct current (DC), providing a stable DC power supply for the uninterruptible power supply (UPS) system. Based on the AC voltage variations of the first power supply 201, the rectifier 11 controls the stability of the output DC voltage, ensuring that the UPS system 100 operates under a stable DC voltage. The rectifier 11 can also filter out some interference signals in the AC power and correct the power factor, thereby reducing interference to the circuit and improving energy efficiency.

[0063] Inverter 12 is used to invert the DC power output from rectifier 11 into AC power. Inverter 12 also controls the voltage and frequency of the AC power, ensuring that the voltage and frequency are within a preset accuracy range to meet the power quality requirements of the uninterruptible power supply system 100. When the current of the uninterruptible power supply system 100 exceeds the preset rated output current, inverter 12 automatically adjusts the voltage and frequency of the AC power to protect the uninterruptible power supply system 100 from damage.

[0064] The inverter 12 also detects the operating status of the uninterruptible power supply system 100 and the battery parameters in the first power supply 201 or the second power supply 202. When the operating status of the uninterruptible power supply system or the battery parameters of the first power supply 201 or the second power supply 202 are abnormal, the inverter 12 generates an alarm signal and switches the power supply to ensure that the uninterruptible power supply system 100 can provide a continuous and stable power supply and avoid damage to the uninterruptible power supply system 100 and equipment due to power interruption.

[0065] Under normal operating conditions, the system is powered by the first power supply 201. The rectifier 11 converts AC power into DC power. A portion of the DC power enters the second power supply 202 via the charger to charge the second power supply 202, ensuring that the second power supply 202 is always fully charged. During this process, by storing the DC power in the second power supply 202, transient pulse interference that cannot be eliminated by the rectifier 11 can be filtered out, providing a stable DC power supply.

[0066] In case of a fault, such as a power outage of the first power source 201, the power supply is switched, and the inverter 12 inverts the DC power output from the second power source 202 to convert it into AC power, providing a stable AC power supply to the feeder cabinet 4 to ensure that the uninterruptible power supply system 100 can provide a continuous and stable power supply. For example, the inverter 12 provides a stable 220V, 50Hz AC power supply to the feeder cabinet 4.

[0067] In some embodiments, such as Figure 6As shown, the first power supply cabinet 1 also includes a first isolation transformer 13 and / or a second isolation transformer 14; the input terminal of the first isolation transformer 13 is connected to the first power supply 201, and the output terminal of the first isolation transformer 13 is electrically connected to the input terminal of the rectifier 11; the output terminal of the inverter 12 is electrically connected to the input terminal of the second isolation transformer 14, and the output terminal of the second isolation transformer 14 is electrically connected to the first input terminal e of the anti-reverse current diode module 31.

[0068] The first isolation transformer 13 and the second isolation transformer 14 are used to achieve electrical isolation.

[0069] In this embodiment, the first isolation transformer 13 electrically isolates the first power supply 201 from the feeder cabinet 4. The first isolation transformer 13 has a certain filtering function, which can filter out electromagnetic interference, noise, and voltage fluctuations in the first power supply 201, making the power quality more stable and effectively preventing the feeder cabinet 4 from being interfered with by the first power supply 201. At the same time, the first isolation transformer 13 can reduce the neutral-to-ground voltage, providing a basic condition for the feeder cabinet 4, which requires a high-precision power supply.

[0070] Electrical isolation is achieved through the second isolation transformer 14, filtering out electromagnetic interference, noise, and voltage fluctuations from the first power supply 201 or the second power supply 202, resulting in more stable power quality and effectively preventing interference from the first power supply 201 or the second power supply 202 to the feeder cabinet 4. Simultaneously, the second isolation transformer 14 can reduce the neutral-to-ground voltage, providing a foundation for the feeder cabinet 4, which requires a high-precision power supply.

[0071] In addition, the first isolation transformer 13 and the second isolation transformer 14 also provide functions such as voltage regulation, short circuit protection and overload protection, which delay the impact and damage of short circuit current on other components in the uninterruptible power supply system 100, thereby improving the stability and safety of the uninterruptible power supply system 100.

[0072] In some embodiments, such as Figure 7 As shown, the first power supply cabinet 1 also includes a filter 15; the input terminal of the filter 15 is electrically connected to the output terminal of the first isolation transformer 13, and the output terminal of the filter 15 is electrically connected to the input terminal of the rectifier 11.

[0073] In this embodiment, the filter 15 includes all types of filter circuits known to those skilled in the art, including but not limited to capacitor filter circuits, inductor filter circuits, resistor-capacitor (RC) filter circuits, inductor-capacitor (LC) filter circuits, and resistor-capacitor-inductor (RCL) filter circuits, which are not limited herein.

[0074] In this embodiment, the filter 15 is used to filter out electromagnetic interference signals in the first power supply 201, improve the stability of the first power supply 201, and prevent the electromagnetic interference signals generated by the first power supply 201 from affecting other components in the uninterruptible power supply system 100.

[0075] The filter 15 is also used to suppress harmonic components in the current, reduce harmonic distortion and power loss in the uninterruptible power supply system 100, improve the quality and utilization of power, smooth AC ripple in DC power, protect other components in the uninterruptible power supply system 100, and improve the stability and reliability of the uninterruptible power supply system 100.

[0076] In some embodiments, such as Figure 8 As shown, the first power supply cabinet 1 also includes a fourth switch 16 and / or a fifth switch 17; the input terminal of the first isolation transformer 13 is connected to the first power supply 201 through the fourth switch 16; the connection point between the rectifier 11 and the inverter 12 is electrically connected to the second power supply 202 through the fifth switch 17.

[0077] In this embodiment, under normal operating conditions, the fourth switch 16 is in the connected state and the fifth switch 17 is in the disconnected state, and the first power supply 201 provides AC power to the uninterruptible power supply system 100; at the same time, the rectifier 11 converts the AC power into DC power, and part of the DC power enters the charger to charge the second power supply 202, so as to ensure that the second power supply 202 is always fully charged.

[0078] In the fault condition, the fourth switch 16 is in the open state and the fifth switch 17 is in the connected state, and the second power supply 202 provides DC power to the uninterruptible power supply system 100; at the same time, the inverter 12 inverts the DC power output from the second power supply 202 and converts the DC power into AC power.

[0079] In some embodiments, such as Figure 9 As shown in Figure 10, the second power supply cabinet 2 includes a third isolation transformer 21; the input terminal of the third isolation transformer 21 is electrically connected to the third power supply 203, and the output terminal of the third isolation transformer 21 is electrically connected to the second input terminal f of the anti-reverse current diode module 31.

[0080] The third isolation transformer 21 is used to achieve electrical isolation.

[0081] In this embodiment, a third isolation transformer 21 provides electrical isolation between the third power supply 203 and the feeder cabinet 4. The third isolation transformer 21 has a filtering function, which can filter out electromagnetic interference, noise, and voltage fluctuations in the third power supply 203, resulting in more stable power quality and effectively preventing interference to the feeder cabinet 4 from the third power supply 203. Simultaneously, the third isolation transformer 21 can reduce the neutral-to-ground voltage, providing a basic requirement for the feeder cabinet 4, which needs a high-precision power supply.

[0082] In addition, the third isolation transformer 21 also provides functions such as voltage regulation, short circuit protection and overload protection, which delays the impact and damage of short circuit current on other components in the uninterruptible power supply system 100, thereby improving the stability and safety of the uninterruptible power supply system 100.

[0083] In some embodiments, such as Figure 9 As shown in Figure 10, the second power supply cabinet 2 also includes a sixth switch 22; the input terminal of the third isolation transformer 21 is electrically connected to the third power supply 203 through the sixth switch 22.

[0084] In this embodiment, when the uninterruptible power supply system 100 needs to be inspected, the sixth switch 22 is connected. At this time, the fourth switch 16 and the fifth switch 17 must be disconnected in advance to prevent the inverter 12 from operating in parallel with the second power supply cabinet 2, which would generate a large voltage difference and lead to a short circuit.

[0085] In some embodiments, such as Figure 9 As shown in Figure 10, the second power supply cabinet 2 also includes a voltage regulator 23; the input terminal of the voltage regulator 23 is electrically connected to the output terminal of the third isolation transformer 21, and the output terminal of the voltage regulator 23 is electrically connected to the second input terminal e of the anti-reverse current diode module 31.

[0086] In this embodiment, the voltage regulator 23 is used to adjust the voltage of the AC output from the third isolation transformer 21 to obtain a more stable AC power.

[0087] In some embodiments, the maintenance procedure for the uninterruptible power supply system 100 is as follows:

[0088] (1) Before powering on the circuit where the first power source 201 is located and the circuit where the third power source 203 is located, measure the insulation value of the circuit to ground;

[0089] (2) After the circuit containing the first power source 201 and the circuit containing the third power source 203 are powered on, measure the circuit amplitude and phase sequence;

[0090] (3) Before powering on the circuit where the second power source 202 is located, measure the insulation value of the circuit to ground;

[0091] (4) After the circuit containing the second power source 202 is energized, measure the amplitude of the circuit.

[0092] (5) Check whether the first switch 32, the second switch 33, the third switch 34, the fourth switch 16, the fifth switch 17, and the sixth switch 22 are in normal operation;

[0093] (6) Turn on the room uninterruptible power supply system 100 and check if a fault alarm indication appears;

[0094] (7) Check various parameters; among which, the parameters to be checked include: whether the parameter settings of the first power supply cabinet 1 are set correctly; whether the input voltage of the first power supply 201 is the preset first voltage value and whether the phase sequence is correct; whether the input voltage of the second power supply 202 is the preset second voltage value; whether the third power supply 203 is the preset third voltage value and whether the polarity is correct;

[0095] (8) When the fourth switch 16 is disconnected, the uninterruptible power supply system 100 will automatically switch instantaneously and be powered by the second power supply 202. At this time, the output voltage of the feeder cabinet 4 will not change, the switching time will not be interrupted, the uninterruptible power supply system 100 will control the alarm indicator light to light up, and the current will be DC.

[0096] (9) When the fifth switch 17 is disconnected, the uninterruptible power supply system 100 will automatically switch instantaneously and be powered by the third power supply 203. At this time, the output voltage of the feeder cabinet 4 will not change, the switching time will not be interrupted, the control alarm indicator of the uninterruptible power supply system 100 will light up, and the current will be AC.

[0097] (10) Connect the fifth switch 17, and the uninterruptible power supply system 100 will automatically perform a delayed switching and be powered by the second power supply 202. At this time, the output voltage of the feeder cabinet 4 will not change, the switching time will not be interrupted, and the uninterruptible power supply system 100 will control the alarm indicator light to light up. The current is DC.

[0098] (11) Connect the fourth switch 16. The uninterruptible power supply system 100 will automatically perform a delayed switching and be powered by the first power supply 201. At this time, the output voltage of the feeder cabinet 4 will not change, the switching time will be uninterrupted, the alarm indicator light of the uninterruptible power supply system 100 will be turned off, and the operation will be normal. Thus, the overhaul of the uninterruptible power supply system 100 is completed.

[0099] For example, such as Figure 10As shown, the uninterruptible power supply (UPS) system 100 switches between the first power supply 201, the second power supply 202, and the third power supply 203 through different power input paths and corresponding switch controls. This allows the UPS system 100 to adapt to different operating conditions (including normal operating conditions, fault operating conditions, and maintenance operating conditions), improving the reliability and stability of the UPS system 100 and avoiding power interruptions caused by external power fluctuations or faults. The specific power switching method is shown below:

[0100] Under normal operating conditions, i.e., the first power supply 201 can supply power normally, the fourth switch 16 is in the connected state, the uninterruptible power supply system 100 is connected to the first power supply 201, the power is electrically isolated and filtered by the first isolation transformer 13, and then further filtered by the filter 15 to remove electromagnetic interference signals. The rectifier 11 converts the alternating current (AC) to direct current (DC), the inverter 12 converts the DC back to AC, and supplies power to the feeder cabinet 4 through the output switch circuit 3, ensuring power supply under normal operating conditions. At the same time, part of the DC output from the rectifier 11 charges the second power supply 202.

[0101] In the event of a fault, i.e., when the first power supply 201 fails or malfunctions and cannot supply power, the inverter 12 generates an alarm signal and controls the fifth switch 17 to be in a connected state. The uninterruptible power supply system 100 is then connected to the second power supply 202, which inputs DC power to the uninterruptible power supply system. The inverter 12 converts the DC power to AC power, which is then electrically isolated and filtered by the second isolation transformer 14 and supplies power to the feeder cabinet 4 through the output switch circuit 3. This ensures that in the event of a fault, the uninterruptible power supply system 100 can quickly and seamlessly switch to the backup power supply, maintain the stability of the power supply, and avoid damage to the system and equipment caused by power outages.

[0102] During maintenance, the fourth switch 16 and the fifth switch 17 are in the open state, the sixth switch is in the connected state, the uninterruptible power supply system 100 is connected to the third power supply 203, and the power is processed by the third isolation transformer 21 and the voltage regulator 23 and then supplied to the feeder cabinet 4 through the output switch circuit 3 to ensure the continuity of power supply during maintenance.

[0103] In some embodiments, such as Figure 10 As shown, the first power supply cabinet 1 also includes a diode, the positive terminal of which is electrically connected to the fifth switch 17, and the negative terminal of which is electrically connected to the connection point between the rectifier 11 and the inverter 12.

[0104] In this embodiment, the unidirectional conduction characteristic of the diode is utilized to link it with a control switch to control the charging current from the charger to the battery pack of the second power source 202. It is also used to prevent the reverse flow of current and prevent the backflow of power from damaging the uninterruptible power supply system 100, thereby improving the stability and reliability of the uninterruptible power supply system 100.

[0105] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0106] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An uninterruptible power supply system, characterized in that, include: The system comprises a first power supply cabinet, a second power supply cabinet, an output switching circuit, and a feeder cabinet, wherein the output switching circuit includes an anti-reverse current diode module; The first input terminal of the first power supply cabinet is electrically connected to the first power supply, the second input terminal of the first power supply cabinet is electrically connected to the second power supply, and the output terminal of the first power supply cabinet is electrically connected to the first input terminal of the anti-reverse current diode module. The input terminal of the second power supply cabinet is electrically connected to the third power supply, and the output terminal of the second power supply cabinet is electrically connected to the second input terminal of the anti-reverse current diode module. The output terminal of the anti-reverse current diode module is electrically connected to the feeder cabinet.

2. The uninterruptible power supply system according to claim 1, characterized in that, The output switching circuit also includes a first switch and a second switch; The output terminal of the second power supply cabinet is electrically connected to the second input terminal of the anti-reverse current diode module through the first switch; the output terminal of the anti-reverse current diode module is electrically connected to the feeder cabinet through the second switch.

3. The uninterruptible power supply system according to claim 1 or 2, characterized in that, The output switching circuit also includes a third switch; The output terminal of the second power supply cabinet is electrically connected to the feeder cabinet through the third switch.

4. The uninterruptible power supply system according to claim 1, characterized in that, The first power supply cabinet includes a rectifier and an inverter; The input terminal of the rectifier is electrically connected to the first power supply, the output terminal of the rectifier is electrically connected to the inverter, and the output terminal of the inverter is electrically connected to the first input terminal of the anti-reverse current diode module. The second power source is connected at the connection point between the rectifier and the inverter.

5. The uninterruptible power supply system according to claim 4, characterized in that, The first power supply cabinet also includes a first isolation transformer and / or a second isolation transformer; The input terminal of the first isolation transformer is connected to the first power supply, and the output terminal of the first isolation transformer is electrically connected to the input terminal of the rectifier. The output terminal of the inverter is electrically connected to the input terminal of the second isolation transformer, and the output terminal of the second isolation transformer is electrically connected to the first input terminal of the anti-reverse current diode module.

6. The uninterruptible power supply system according to claim 5, characterized in that, The first power supply cabinet also includes a filter; The input terminal of the filter is electrically connected to the output terminal of the first isolation transformer, and the output terminal of the filter is electrically connected to the input terminal of the rectifier.

7. The uninterruptible power supply system according to claim 5, characterized in that, The first power supply cabinet also includes a fourth switch and / or a fifth switch; The input terminal of the first isolation transformer is connected to the first power source via the fourth switch; The connection point between the rectifier and the inverter is electrically connected to the second power source via the fifth switch.

8. The uninterruptible power supply system according to claim 1, characterized in that, The second power supply cabinet includes a third isolation transformer; The input terminal of the third isolation transformer is electrically connected to the third power supply, and the output terminal of the third isolation transformer is electrically connected to the second input terminal of the anti-reverse current diode module.

9. The uninterruptible power supply system according to claim 8, characterized in that, The second power supply cabinet also includes a sixth switch; The input terminal of the third isolation transformer is electrically connected to the third power supply via the sixth switch.

10. The uninterruptible power supply system according to claim 8, characterized in that, The second power supply cabinet also includes a voltage regulator; The input terminal of the voltage regulator is electrically connected to the output terminal of the third isolation transformer, and the output terminal of the voltage regulator is electrically connected to the second input terminal of the anti-reverse current diode module.

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