Uninterruptible power supply system

Abstract

The utility model provides an uninterruptible power supply system, which comprises at least one uninterruptible power supply unit, and a first switch device and a fourth power input end which are matched with each uninterruptible power supply unit, and each uninterruptible power supply unit comprises a second power input end, a third power input end, a load end, a first rectification unit and an inversion unit, the third power input end is connected with the input end of the inversion unit; the fourth power input end is connected between the third power input end and the input end of the inverter unit through the first switch device; when the second power input end breaks down and / or the first rectifying unit breaks down, the first switching device can be closed, power is supplied to the load end through the fourth power input end, the newly-added fourth power input end can be connected into the original third power input end through the first switching device, the electric energy storage capacity is increased, and the energy storage efficiency is improved. The power supply time is greatly prolonged, and the power supply reliability is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic power technical field especially, it is an uninterrupted power supply system. BACKGROUND

[0002] In prior art, specifically referring to the contrast file of patent application No.202211736667.9 discloses when the power of the second power input end is difficult to meet the power supply demand of the load end or the second power input end fails, the controller can control the DC-DC unit to convert and transmit the current of the third power input end to the inverter unit in DC-DC to meet the power supply of the load end, but actually if the second power input end fails for a long time, the power stored in the third power input end may not be enough to support, resulting in insufficient reliability of uninterrupted power supply. UTILITY MODEL CONTENT

[0003] The utility model aims at providing an uninterrupted power supply system to further improve the power supply reliability.

[0004] The utility model provides an uninterrupted power supply system, which comprises at least one uninterrupted power supply unit, a first switch device and a fourth power input end matched with each uninterrupted power supply unit, each uninterrupted power supply unit comprising a first power input end, a second power input end, a third power input end, a bypass, a main path, and a load end.

[0005] The fourth power input end is connected between the corresponding third power input end and the input end of the inverter unit through each first switch device.

[0006] When the second power input end of each uninterrupted power supply unit fails and / or the first rectifier unit fails, the corresponding first switch device can be closed to make the path between the fourth power input end and the input end of the inverter unit conductive, thereby supplying power to the load end through the fourth power input end.

[0007] Further, the fourth power input end comprises a plurality of parallel battery packs; the power stored in the fourth power input end is greater than the power stored in the third power input end, and the power stored in the fourth power input end is N times the power stored in the third power input end.

[0008] Further, the utility model further comprises a second rectifier unit, and each second power input end is connected between the fourth power input end and each first switch device through the second rectifier unit.

[0009] If one or more of the second power input terminals are not malfunctioning and the second rectifying unit is not malfunctioning, the second rectifying unit is capable of converting the current inputted from any one of the second power input terminals which is not malfunctioning into AC-DC and transmitting the current to the fourth power input terminal, thereby supplying power to the fourth power input terminal;

[0010] When each of the first switch devices is closed, the passage between the second rectifying unit and the fourth power input terminal and the input terminal of the corresponding inverting unit is conducted, and if one or more of the second power input terminals are not malfunctioning and the second rectifying unit is not malfunctioning, the third power input terminal and the load terminal are supplied with power by the second power input terminal and the second rectifying unit;

[0011] If each of the second power input terminals is malfunctioning and / or the second rectifying unit is malfunctioning, the load terminal is supplied with power by the fourth power input terminal.

[0012] Further, a fifth power input terminal is further included, and the fifth power input terminal is connected with the input terminal of the second rectifying unit;

[0013] When each of the second power input terminals is malfunctioning and the second rectifying unit is not malfunctioning, the second rectifying unit is capable of converting the current inputted from the fifth power input terminal into AC-DC and transmitting the current to the fourth power input terminal, thereby supplying power to the fourth power input terminal;

[0014] When each of the first switch devices is closed, the passage between the second rectifying unit and the fourth power input terminal and the input terminal of the corresponding inverting unit is conducted, and if each of the second power input terminals is malfunctioning and the fifth power input terminal and the second rectifying unit are not malfunctioning, the third power input terminal and the load terminal are supplied with power by the fifth power input terminal and the second rectifying unit;

[0015] If each of the second power input terminals and the fifth power input terminal is malfunctioning and / or the second rectifying unit is malfunctioning, the load terminal is supplied with power by the fourth power input terminal.

[0016] Further, the fifth power input terminal is a diesel engine input terminal.

[0017] Further, a second switch device adapted to each of the uninterruptible power supply units is further included, and the output terminal of each of the first rectifying units is connected with the input terminal of the inverting unit through the corresponding second switch device;

[0018] When the second power input terminal of each of the uninterruptible power supply units is malfunctioning and / or the first rectifying unit is malfunctioning, the corresponding second switch device is capable of being disconnected, so that the passage between the first rectifying unit and the input terminal of the inverting unit is not conducted.

[0019] Further, each second switch device and each first switch device is a contactor.

[0020] Further, a controller is further included, the controller is connected with the first switch device and the second switch device matched with each uninterruptible power supply unit;

[0021] The controller is used for controlling the second switch device of the corresponding uninterruptible power supply unit to be opened and the first switch device to be closed when the second power input end corresponding to any one or more uninterruptible power supply units fails and / or the first rectifier unit fails.

[0022] Further, the load end is connected with each corresponding load through a circuit breaker or a fuse.

[0023] Further, the bypass is a bidirectional switch, and the first power input end is connected with the load end through the bidirectional switch.

[0024] When the first switch device is closed, if the electric energy in the fourth power input end is exhausted, and the first power input end and the bidirectional switch are not faulty, the load end is supplied with power through the first power input end and the bidirectional switch.

[0025] The uninterruptible power supply system provided by the utility model, including at least one uninterruptible power supply unit, first switch device and fourth power input end matched with each uninterruptible power supply unit, each uninterruptible power supply unit includes second power input end, third power input end, load end, first rectifier unit and inverter unit, third power input end connects the input end of inverter unit, fourth power input end is connected to the input end of inverter unit between third power input end through first switch device, when second power input end fails and / or first rectifier unit fails, first switch device can be closed, and the load end is supplied with power through fourth power input end, the system can incorporate the fourth power input end of new into the third power input end of original through first switch device, increase the electric energy storage capacity, make the power supply time greatly prolong, further improve the power supply reliability. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the drawings needed to be used in the specific embodiment or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0027] Figure 1 It is a schematic diagram of the uninterruptible power supply structure provided by the embodiment of the utility model;

[0028] Figure 2 A structure schematic diagram of an uninterruptible power supply system provided by the embodiment of the present application is provided;

[0029] Figure 3 A structure schematic diagram of another uninterruptible power supply system provided by the embodiment of the present application is provided;

[0030] Figure 4 A structure schematic diagram of another uninterruptible power supply system provided by the embodiment of the present application is provided;

[0031] Figure 5 A structure schematic diagram of another uninterruptible power supply system provided by the embodiment of the present application is provided;

[0032] Figure 6 A structure schematic diagram of another uninterruptible power supply system provided by the embodiment of the present application is provided. DETAILED DESCRIPTION

[0033] The technical solutions of the present application will be described clearly and completely in combination with embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] An uninterruptible power supply (UPS) is an uninterruptible power supply containing an energy storage device. It is mainly used to provide uninterrupted power supply for devices with high requirements for power stability. In the prior art (see the comparison file with patent application number 202211736667.9 for details), for example Figure 1The uninterrupted power supply structure schematic diagram is shown, when the power of the second power input end (an AC input source, which can be an AC input such as a power supply) is difficult to meet the power supply demand of the load end or the second power input end fails, the controller can control the DC-DC unit to convert and transmit the current input from the third power input end (a DC input source, which can be an energy storage device such as a battery cluster) to the inverter unit to meet the power supply of the load end. In the prior art, the controller controls the DC-DC unit to convert the current input from the third power input end. This method actually increases the failure point. Therefore, during the process of switching from the main circuit to the third power input end to supply power to the load, there may be a certain power-off time, which reduces the reliability of the UPS power supply. In addition, if the second power input end fails for a long time, the power stored in the third power input end may not be enough to support the power supply of the load end. After the power of the third power input end is consumed, if the first power input end is not faulty, the bypass will be used to supply power to the load end. The current input to the load end by the bypass is unstable, and the power supply safety is a problem. If the first power input end is faulty after the power of the third power input end is consumed, power failure will occur immediately, which also reduces the reliability of the power supply. In summary, the reliability of the uninterrupted power supply in the prior art is still greatly insufficient.

[0035] Therefore, the embodiments of the present application provide an uninterrupted power supply system to solve the problem of insufficient power supply reliability, and the technology can be applied to uninterrupted power supply.

[0036] In order to facilitate the understanding of the present embodiment, first, a kind of uninterrupted power supply system disclosed in the embodiments of the present application is introduced in detail.

[0037] Referring to Figure 2As shown, the utility model embodiment provides a kind of uninterrupted power supply system, comprising: at least one uninterrupted power supply unit 1, with the first switching device 2 and fourth power input 3 of each uninterrupted power supply unit 1 adaptation, each uninterrupted power supply unit 1 includes: first power input 11, second power input 12, third power input 13, bypass 14, main road 15, load end 16;Main road 15 includes the first rectifier unit 151 and inverter unit 152 connected in sequence, the input end of first rectifier unit 151 connects second power input 12, and the output end of inverter unit 152 connects load end 16;Third power input 13 connects the input end of inverter unit 152;Fourth power input 3 is connected to between corresponding third power input 13 and the input end of inverter unit 152 by each first switching device 2;When the second power input 12 of each uninterrupted power supply unit fails and / or first rectifier unit 151 fails, corresponding first switching device 2 can be closed, to make the passage between fourth power input 3 and the input end of inverter unit 152 conductive, and fourth power input 3 is powered for load end 16.

[0038] The first power input can be a bypass input source, such as single-phase power or three-phase power. The second power input can include an AC input source, which can be a commercial AC input. The third power input can be a DC input source, which can be an energy storage device, such as a battery cluster. The first switching device can be a contactor. The fourth power input is also a DC input source.

[0039] The first rectifier unit and the second rectifier unit are voltage-adapted, meaning that the output voltages of the first rectifier unit and the second rectifier unit are within the same voltage range.

[0040] The input voltage of the fourth power input matches the input voltage of the third power input, meaning that the input voltage of the fourth power input and the input voltage of the third power input are within the same voltage range, and the input voltage of the fourth power input and the charging voltage of the third power input are within the same voltage range.

[0041] The input voltage of the third power input matches the input voltage of the inverter unit, meaning that the input voltage of the third power input and the input voltage of the inverter unit are within the same voltage range.

[0042] The first rectifier unit can include an AC-DC (alternating current-direct current) circuit. The inverter unit can be a DC-AC (direct current-alternating current) circuit.

[0043] The input end of the first rectifying unit is connected with the second power input end, the output end of the first rectifying unit is connected with the input end of the inverting unit, and the output end of the inverting unit is connected with the load end; each first rectifying unit is configured to convert the current input from the corresponding second power input end into direct current and transmit the direct current to the inverting unit; and each inverting unit is configured to convert the input current into alternating current and transmit the alternating current to the load end.

[0044] According to different power supply requirements, the above uninterrupted power supply system can include a single uninterrupted power supply unit or multiple uninterrupted power supply units.

[0045] By Figure 2 It can be seen that, in fact, the uninterrupted power supply system includes one fourth power input end, one or more uninterrupted power supply units, and a first switching device corresponding to each uninterrupted power supply unit, that is, the number of uninterrupted power supply units is the same as the number of first switching devices, and the uninterrupted power supply units and the first switching devices are one-to-one corresponding; and each uninterrupted power supply unit includes: a first power input end (equivalent to the first power input end 201 in Figure 1 ), a second power input end 12 (equivalent to the second power input end 202 in Figure 1 ), a third power input end 13 (equivalent to the third power input end 207 in Figure 1 ), a bypass 14 (equivalent to the bypass 204 in Figure 1 ), a main path 15 (equivalent to the main path 205 in Figure 1 ), and a load end 16 (equivalent to the load end 203 in Figure 1 ); the main path 15 includes a first rectifying unit 151 (equivalent to the rectifying unit 2051 in Figure 1 ) and an inverting unit 152 (equivalent to the inverting unit 2052 in Figure 1 ) connected in sequence.

[0046] Figure 2 In the above, the third power input end is directly connected with the input end of the inverting unit; and the fourth power input end is connected between the corresponding third power input end and the input end of the inverting unit through each first switching device, that is, the fourth power input end is connected in parallel with the corresponding third power input end through each first switching device.

[0047] In the implementation process, the following is taken as an example of any one uninterruptible power supply unit. Since the third power input end in the uninterruptible power supply system provided by the application is directly connected with the input end of the inverter unit, when the power supplied by the second power input end corresponding to the uninterruptible power supply unit cannot meet the power supply demand of the load end, or the second power input end fails (such as power failure) and / or the first rectifier unit fails, the third power input end corresponding to the uninterruptible power supply unit can directly input current to the inverter unit. Compared with the prior art, not only how to solve the problem when the rectifier unit fails is disclosed, but also the possible failure point when switching from the main circuit to the third power input end for power supply is reduced, and the reliability of the uninterruptible power supply is improved.

[0048] Moreover, since the fourth power input end in the uninterruptible power supply system provided by the application is connected with the input end of the inverter unit in parallel through the first switch device after being connected with the third power input end, when the power supplied by the second power input end corresponding to the uninterruptible power supply unit cannot meet the power supply demand of the load end, or the second power input end fails and / or the first rectifier unit fails, the first switch device corresponding to the uninterruptible power supply unit can be closed. Since a certain time is required for the closing of the first switch device, during the closing process, the third power input end can directly input current to the inverter unit, thereby ensuring the power supply of the load end first. After the first switch device is closed, the path between the fourth power input end and the input end of the inverter unit is conducted. At this time, since the power of the third power input end is reduced, the input voltage of the third power input end is less than that of the fourth power input end. Therefore, the fourth power input end can input current to the inverter unit through the first switch device until the input voltage of the third power input end is greater than that of the fourth power input end, and the third power input end directly inputs current to the inverter unit again. In this way, the power supply of the load end can be met. Compared with the prior art, the fourth power input end is connected with the third power input end through the first switch device, and for each uninterruptible power supply unit, the power supply is changed from the third power input end to the power supply of the third power input end and the fourth power input end together, the power storage capacity is increased, the power supply time is greatly prolonged, even if the second power input end fails for a long time, the power supply of the load end can also be supported for a long time, and the power is not easily consumed, thereby further improving the reliability of the power supply.

[0049] Compared with the prior art, in the embodiment, when the second power input end and / or the first rectifier unit of the uninterruptible power supply unit fails, even if the third power input end also fails, the bypass power supply is not needed, and after the first switch device is closed, the fourth power input end is connected, and the inverter unit can still supply power.

[0050] In summary, the uninterruptible power supply system provided by the embodiment makes up for the deficiency in the reliability of the uninterruptible power supply in the prior art.

[0051] In addition, the fourth power input end in the uninterruptible power supply system provided by the application can supply power to the input ends of multiple uninterruptible power supply units through the corresponding first switch device, that is, the fourth power input end can simultaneously meet the power supply requirements of multiple load ends. In the prior art, the controller of each uninterruptible power supply needs to control the corresponding third power input end to supply power to the corresponding load end. In the UPS equipment room, multiple uninterruptible power supplies (that is, uninterruptible power supply units) are running. The fourth power input end can simultaneously meet the power supply requirements of multiple load ends, which can simultaneously improve the reliability of multiple uninterruptible power supply units, is more convenient, easy to control, and cost-saving compared with the prior art.

[0052] The uninterruptible power supply system provided by the above embodiment includes at least one uninterruptible power supply unit, a first switch device matched with each uninterruptible power supply unit, and a fourth power input end. Each uninterruptible power supply unit includes a second power input end, a third power input end, a load end, a first rectifier unit, and an inverter unit. The third power input end is connected to the input end of the inverter unit. The fourth power input end is connected to the third power input end and the input end of the inverter unit through the first switch device. When the second power input end fails and / or the first rectifier unit fails, the first switch device can be closed to supply power to the load end through the fourth power input end. The system can integrate the newly added fourth power input end into the original third power input end through the first switch device, increase the energy storage capacity, greatly extend the power supply time, and further improve the power supply reliability.

[0053] As a possible implementation, the fourth power input end 3 stores more energy than the third power input end 13, and the energy stored in the fourth power input end 3 is N times the energy stored in the third power input end 13.

[0054] Since the fourth power input end is large enough, the power is not easily depleted, the power supply time is greatly extended, and the load end can be supported for a long time. It can also simultaneously meet the power supply requirements of multiple load ends.

[0055] Specifically, in a possible implementation, the fourth power input end can include multiple parallel battery groups. When the third power input end also uses batteries, the number of battery groups in the fourth power input end needs to be several times or more than the number of battery groups in the third power input end.

[0056] As a possible implementation, referring to Figure 3 As shown in the figure, the uninterruptible power supply system further includes a second rectifier unit 4. Each second power input end 12 is connected to the fourth power input end 3 and each first switch device 2 through the second rectifier unit 4.

[0057] If one or more of the second power inputs 12 are not faulty and the second rectifying unit 4 is not faulty, the second rectifying unit 4 is able to convert the current inputted by any one of the non-faulty second power inputs 12 from alternating current to direct current and transmit the current to the fourth power input 3, to supply power to the fourth power input 3.

[0058] When each first switch device 2 is closed, the passage between the second rectifying unit 4 and the input end of the corresponding inverting unit 15 2 is conducted, and if one or more of the second power inputs 12 are not faulty and the second rectifying unit 4 is not faulty, the third power input 13 and the load end 16 are supplied with power by any one of the non-faulty second power inputs 12 and the second rectifying unit 4.

[0059] If each second power input 12 is faulty and / or the second rectifying unit 4 is faulty, the load end 16 is supplied with power by the fourth power input 3.

[0060] The second rectifying unit is the same as the circuit in the first rectifying unit, the input end of the second rectifying unit is connected with each second power input, in fact, each second power input is connected with the second rectifying unit through an adapted switch (not shown in the drawings), that is, a switch is arranged between each second power input and the connection line of the second rectifying unit, the output end of the second rectifying unit is connected between the fourth power input and each first switch device, and the second rectifying unit is used to convert the current inputted by the second power input from alternating current to direct current and transmit the current to the inverting unit, the third power input and the fourth power input.

[0061] In the specific implementation process, when each second power input is not all faulty (that is, at least one second power input is normal) and the second rectifying unit is not faulty (that is, if the second rectifying unit and at least one second power input are normal), no matter whether the first switch device is closed or not, the second rectifying unit is able to convert the current inputted by one normal second power input from alternating current to direct current and transmit the current to the fourth power input, to charge the fourth power input.

[0062] And for each uninterrupted power supply unit, when the first switch device of the uninterrupted power supply unit is closed, the passage between the second rectifier unit and the input end of the corresponding inverter unit and the fourth power input end is turned on, if each second power input end does not fail and the second rectifier unit does not fail, the second rectifier unit can not only convert the current input by one of the second power input ends which does not fail into alternating current-direct current and transmit it to the third power input end through the corresponding first switch device to charge the third power input end, but also convert the current input by one of the second power input ends which does not fail into alternating current-direct current and transmit it to the load end through the corresponding first switch device to supply power to the load end.

[0063] In fact, when each second power input end does not fail and the second rectifier unit does not fail, even if the third power input end and the fourth power input end do not fail and have electric energy, they can normally supply power when the first switch device is closed, at this time, the third power input end and the fourth power input end do not need to supply power, but any normal second power input end supplies power to the load end through the second rectifier unit, so that when all the second power input ends lose power (fail) and / or the second rectifier unit fails, the third power input end and the fourth power input end can have as much stored energy as possible to supply power to the load end, improving the reliability of power supply. Moreover, the stable and continuous alternating current mains power is used to supply power to the load end, compared with the energy storage device (i.e. the third power input end and the fourth power input end), it can supply power for a long time, the power supply is more stable, and the power supply effect is better.

[0064] In the specific implementation process, when each second power input end fails and / or the second rectifier unit fails, the second rectifier unit can no longer convert the current input by the second power input end into alternating current-direct current and transmit it to the fourth power input end, the third power input end and the load end, therefore, when each second power input end fails and / or the second rectifier unit fails, the first switch device is closed, only the third power input end and the fourth power input end can supply power to the load end, and the current stored in the third power input end and the fourth power input end may not be enough to support the load end to supply power.

[0065] It should be noted that when there are multiple UPS units in the UPS system, one or more second power input terminals can be connected to the same transformer, and multiple second power input terminals can also be connected to different transformers. Specifically, the total power grid (not shown in the figure) can be connected to the second power input terminals of each UPS unit through one or more transformers (not shown in the figure). For example, when there are two UPS units in the UPS system, the total power grid can be connected to the second power input terminals of the first and second UPS units through one transformer. When the transformer fails, the second power input terminals of the first and second UPS units will both fail (i.e., each second power input terminal fails). In addition, the total power grid can also be connected to the second power input terminal of the first UPS unit through one transformer and to the second power input terminal of the second UPS unit through another transformer. When the first transformer fails, the first UPS unit will fail, but the second power input terminal of the second UPS unit can not fail (i.e., not all second power input terminals fail).

[0066] As a possible implementation, refer to Figure 4 As shown, the UPS system further includes a fifth power input terminal 5 connected to the input terminal of the second rectifying unit 4.

[0067] When each second power input terminal 12 fails and the second rectifying unit 4 does not fail, the second rectifying unit 4 can convert the current input from the fifth power input terminal 5 into AC-DC and transmit it to the fourth power input terminal 3 to supply power to the fourth power input terminal 3.

[0068] When each first switch device 2 is closed, the path between the second rectifying unit 4 and the fourth power input terminal 3 and the input terminal of the corresponding inverter unit 152 is conducted. If each second power input terminal 12 fails and the fifth power input terminal 5 and the second rectifying unit 4 do not fail, the third power input terminal 13 and the load terminal 16 are powered by the fifth power input terminal 5 and the second rectifying unit 4.

[0069] If each second power input terminal 12 and the fifth power input terminal 5 fail, and / or the second rectifying unit 4 fails, the load terminal 16 is powered by the fourth power input terminal 3.

[0070] The above-mentioned fifth power input terminal can use an AC input source, such as commercial power, a diesel generator, etc.

[0071] In actual implementation, the fifth power input end and the second power input end can be connected to each of the first switch device and the fourth power input end through the second rectifying unit.

[0072] In fact, the fifth power input end and the second rectifying unit can also be connected through an adaptive switch (not shown in the figure).

[0073] In actual implementation, when each of the second power input ends fails and the second rectifying unit is normal, the second rectifying unit can convert the current input by the fifth power input end into direct current and transmit to the fourth power input end to charge the fourth power input end, regardless of whether the first switch device is closed or not.

[0074] When the first switch device is closed, the path between the second rectifying unit and the fourth power input end and the input end of the inverter unit is conducted. If each of the second power input ends fails, but the fifth power input end and the second rectifying unit are normal, the second rectifying unit can not only convert the current input by the fifth power input end into direct current and transmit to the third power input end through the first switch device to charge the third power input end, but also convert the current input by the fifth power input end into direct current and transmit to the load end through the first switch device to supply power to the load end.

[0075] In fact, when each of the second power input ends is abnormal, the fifth power input end and the second rectifying unit are normal, and the first switch device is closed, the third power input end and the fourth power input end can not be directly used to supply power to the load end, but the fifth power input end can replace the second power input end to continue to supply power to the load end, the third power input end and the fourth power input end, thereby improving the reliability of power supply, making the power supply more stable, and the power supply effect better.

[0076] Since the fifth power input end can continuously charge the fourth power input end, when the second rectifying unit fails or the fifth power input end and each of the second power input ends fail, the fourth power input end has energy storage and can continue to supply power to the load end.

[0077] As a possible implementation, the above-mentioned fifth power input end can use a diesel generator input end. When the fourth power input end includes a plurality of parallel battery groups, the use of the diesel generator input end to supply power to the load end is more stable and reliable due to the characteristics of the diesel generator itself.

[0078] In a possible implementation, referring to Figure 5As shown, the uninterruptible power supply system further comprises a second switch device 6 adapted to each uninterruptible power supply unit 1, and the output end of each first rectifying unit 151 is connected to the input end of the inverter unit 152 through the corresponding second switch device 6.

[0079] When the second power input end 12 of each uninterruptible power supply unit 1 fails and / or the first rectifying unit 151 fails, the corresponding second switch device 6 can be disconnected to make the path between the first rectifying unit 151 and the input end of the inverter unit 152 not conductive.

[0080] In the implementation process, when the second power input end fails or the first rectifying unit fails, the corresponding second switch device can be disconnected to make the path between the first rectifying unit and the input end of the inverter unit not conductive.

[0081] In a possible implementation, the second switch device can also be a contactor.

[0082] In a possible implementation, referring to Figure 6 As shown, the uninterruptible power supply system further comprises a controller 7 connected to the first switch device 2 and the second switch device 6 of each uninterruptible power supply unit 1.

[0083] The controller described above can be a general central processing unit (CPU), a general processor, a digital signal processing (DSP), an application specific integrated circuits (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It can implement or execute various exemplary logic blocks, modules and circuits described in combination with the disclosure. The processor described above can also be a combination of computing functions, such as one or more microprocessor combinations, combinations of DSP and microprocessor, etc., and the controller 206 can also include an analog to digital converter (ADC) for converting the analog quantity corresponding to the voltage of the detected first power input end 201 input into the bypass 204 into a digital quantity.

[0084] In fact, Figure 6 The controller in the above also connects to the second rectifying unit and each uninterruptible power supply unit.

[0085] The controller 7 is configured to control the second switch device 6 of the corresponding UPS unit 1 to be open and the first switch device 2 to be closed when the second power input 12 of any one or more of the UPS units 1 fails and / or the first rectifier unit 151 fails.

[0086] In the implementation process, the first rectifier unit can be disconnected and the fourth power input and / or the second rectifier unit can be connected by adding the first switch device and the second switch device.

[0087] Specifically, when the controller detects that the second power input of a certain UPS unit loses power or the first rectifier unit fails, the connection between the first rectifier unit and the inverter is disconnected through the second switch device, and at the same time, the fourth power input and / or the second rectifier unit to the input end of the inverter unit of the UPS is connected through the first switch device.

[0088] In a possible implementation, each load end can be connected to multiple loads, and each load corresponding to the load end is connected through a circuit breaker or a fuse.

[0089] In a possible implementation, the bypass is a bidirectional switch, and the first power input is connected to the load end through the bidirectional switch; when the first switch device is closed, if the power in the fourth power input is exhausted and the first power input and the bidirectional switch are not faulty, the first power input supplies power to the load end through the bidirectional switch.

[0090] The UPS system provided by the utility model has the advantages that the third power input remains unchanged, the fourth power input is newly added, and another power supply (fifth power input) is introduced to supply power to the newly added fourth power input, when single or multiple UPS (uninterruptible power supply unit) rectifier units fail or the second power input fails, the newly added fourth power input is connected to the original third power input through a diode, a contactor and the like after detection, the power storage capacity is increased, and the power supply time is greatly prolonged.

[0091] The charging voltage of the third power input of each UPS unit should be the same, so that the fourth power input can charge multiple third power inputs at the same time.

[0092] The above is only a demonstrative embodiment of the utility model, and is not used to limit the protection scope of the utility model, and the protection scope of the utility model is determined by the appended claims. The special word "demonstrative" in this place means "as an example, embodiment or illustrative". Any embodiment explained as "demonstrative" in this place is not necessarily explained as superior or better than other embodiments.

[0093] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as implying or implying relative importance or implying the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0094] The above has described various embodiments of the present disclosure, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those skilled in the art without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles, practical applications, or improvements to the technology in the market of the embodiments, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

[0095] Finally, it should be noted that: obviously, the above embodiments are only examples for clearly illustrating the utility model, and are not limited to the implementation. For those skilled in the art, on the basis of the above description, other different forms of changes or changes can also be made. Here, it is not necessary and impossible to enumerate all the implementation. The obvious changes or changes derived therefrom are still within the protection scope of the utility model.

Claims

1. An uninterruptible power supply system, characterized by comprising: The application relates to an uninterruptible power supply unit, which comprises at least one uninterruptible power supply unit, a first switch device matched with each uninterruptible power supply unit and a fourth power input end, wherein each uninterruptible power supply unit comprises a first power input end, a second power input end, a third power input end, a bypass, a main path and a load end; the main path comprises a first rectifier unit and an inverter unit connected in sequence, the input end of the first rectifier unit is connected with the second power input end, and the output end of the inverter unit is connected with the load end; the third power input end is connected with the input end of the inverter unit; the fourth power input end is connected with the input end of the inverter unit through each first switch device; when the second power input end of each uninterruptible power supply unit is faulty and / or the first rectifier unit is faulty, the corresponding first switch device can be closed to make the path between the fourth power input end and the input end of the inverter unit conductive, and the load end is powered by the fourth power input end. The fourth power input end comprises a plurality of parallel battery groups; the electric energy stored in the fourth power input end is greater than the electric energy stored in the third power input end, and the electric energy stored in the fourth power input end is N times of the electric energy stored in the third power input end. The application further comprises a second rectifier unit, each second power input end is connected with the fourth power input end and each first switch device through the second rectifier unit; if one or more second power input ends are not faulty and the second rectifier unit is not faulty, the second rectifier unit can convert the current input by any non-faulty second power input end into AC-DC and transmit the current to the fourth power input end to power the fourth power input end; when each first switch device is closed, the path between the second rectifier unit and the fourth power input end and the input end of the corresponding inverter unit is conductive, if one or more second power input ends are not faulty and the second rectifier unit is not faulty, the third power input end and the load end are powered by any non-faulty second power input end and the second rectifier unit; if each second power input end is faulty and / or the second rectifier unit is faulty, the load end is powered by the fourth power input end. The application further comprises a fifth power input end, the fifth power input end is connected with the input end of the second rectifier unit; when each second power input end is faulty and the second rectifier unit is not faulty, the second rectifier unit can convert the current input by the fifth power input end into AC-DC and transmit the current to the fourth power input end to power the fourth power input end.

2. The system of claim 1, wherein, ​ 3. The system of claim 1, wherein, ​ ​ ​ ​ 4. The system of claim 3, wherein, ​ ​ When each of the first switch devices is closed, a path between the second rectifier unit and the fourth power input terminal and the input terminal of the corresponding inverter unit is conducted, and if each of the second power input terminals fails and the fifth power input terminal and the second rectifier unit do not fail, the third power input terminal and the load terminal are powered by the fifth power input terminal and the second rectifier unit; If each of the second power input terminals and the fifth power input terminal fails, and / or the second rectifier unit fails, the load terminal is powered by the fourth power input terminal.

5. The system of claim 4, wherein, The fifth power input terminal is a diesel engine input terminal.

6. The system of claim 4, wherein, The second switch device is further included, and the output terminal of each of the first rectifier units is connected to the input terminal of the inverter unit through the corresponding second switch device. When the second power input terminal of each of the uninterruptible power supply units fails and / or the first rectifier unit fails, the corresponding second switch device can be disconnected to make the path between the first rectifier unit and the input terminal of the inverter unit not conductive.

7. The system of claim 6, wherein, Each of the second switch devices and each of the first switch devices is a contactor.

8. The system of claim 6, wherein, A controller is further included, and the controller is connected to the first switch device and the second switch device of each of the uninterruptible power supply units. The controller is used to control the second switch device of the corresponding uninterruptible power supply unit to be disconnected and the first switch device to be closed when the corresponding second power input terminal of any one or more of the uninterruptible power supply units fails and / or the first rectifier unit fails.

9. The system of claim 1, wherein, The load terminal is connected to a plurality of loads, and the load terminal is connected to each of the corresponding loads through a circuit breaker or a fuse.

10. The system of claim 8, wherein, The bypass is a bidirectional switch, and the first power input terminal is connected to the load terminal through the bidirectional switch. When the first switch device is closed, if the power in the fourth power input terminal is exhausted and the first power input terminal and the bidirectional switch do not fail, the load terminal is powered by the first power input terminal and the bidirectional switch.

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