CN103887872B - UPS device - Google Patents
UPS device Download PDFInfo
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- CN103887872B CN103887872B CN201210562318.XA CN201210562318A CN103887872B CN 103887872 B CN103887872 B CN 103887872B CN 201210562318 A CN201210562318 A CN 201210562318A CN 103887872 B CN103887872 B CN 103887872B
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- ups
- inverter
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- accumulator battery
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Abstract
The present invention provides a kind of UPS device, and including at least two group UPS unit, often group UPS unit includes: a UPS inverter；One UPS accumulator battery；One switching subelement, has an input node that the UPS accumulator battery with described UPS unit is connected, and the output node connected one to one with the input of the UPS inverter of described UPS unit；And one control subelement, for automatically turning on the electrical connection of in described input node and described output node according to malfunction.The UPS device of the present invention is when occurring when municipal power failure and a UPS fault simultaneously, the accumulator battery of two UPS can be made the most simultaneously for load supplying, the total duration of ups system without reduction, and in parallel access do not have the generation of transient high-current and electric arc the most in parallel time without potential safety hazard.
Description
Technical field
The present invention relates to power communications field, particularly relate to a kind of UPS device, particularly to a kind of electric power storage
The UPS device that Chi Zuke automatically switches.
Background technology
The power supply of communication network device usually requires that have higher safety and reliability.Communications equipment room is universal
Use the ups power system of the operating structure with double parallel power-sharing.In this electric power-feeding structure,
When externally fed interrupts and when a UPS inverter breaks down, another normal UPS inverter
Adapter.Now, the accumulator battery electric discharge hung under only normal UPS inverter, and fault UPS inverter
Accumulator battery can not be utilized.The accumulator time is so caused to shorten half, it is difficult to meet repairing requirement.
In order to solve the problems referred to above, current commonly used conventional UPS accumulator manual switching cabinet, structure is such as
Shown in Fig. 1.When externally fed interrupts and UPS1 inverter breaks down, load is by UPS2 inverter
Adapter, UPS2 accumulator battery individually powers to the load.After attendant reaches the spot, disconnect UPS 1 inverse
Become the switch Q1 between device and UPS1 accumulator battery, make fault UPS inverter detachment system.Then, hands
Dynamic Guan Bi switch Q5, makes UPS1 accumulator battery access UPS2 inverter.UPS1 accumulator battery and UPS2
Accumulator battery parallel connection is load supplying through UPS2 inverter.But, attendant is by UPS1 accumulator
Before group accesses UPS2 inverter, UPS2 accumulator battery is in discharge condition, with UPS1 accumulator battery
Between will there is voltage difference.When the UPS2 accumulator battery discharge condition time is long, it stores with UPS1
Voltage difference between set of cells is higher.After UPS1 accumulator battery accesses UPS2 inverter, there is higher electricity
Two accumulator battery parallel operations of pressure reduction will result in the generation of transient high-current and electric arc, there is impact operation
Personnel and the hidden danger of equipment safety.
Existing UPS accumulator battery switching device, is required for manual operation after attendant rushes towards scene and breaks
Drive fault UPS inverter, then close manual interconnection switch, by the accumulator battery parallel connection of two UPS be
Load supplying.After norms of mainteaance requires UPS fault of converter, attendant must rush towards scene in 30 minutes.
Such as when ups system the most often carries total a length of 2 hours, by UPS2 after UPS 1 fault of converter
Accumulator battery is discharged and is incorporated to UPS1 accumulator battery after 30 minutes again, system actual total time a length of 1.5 hours,
The actual duration of accumulator battery reduces 25%.Thus, manual switching mode makes accumulator battery grow up actual time
Width reduces.Although existing utility model patent " UPS backup battery shifting cabinet " (application number:
200820167882.0) in scheme by 2 transition resistances eliminate two pool-sizes differ, voltage storage not etc.
Transient high-current during cell parallel operation and the electric arc that produces, ensure operator and the safety of equipment.But,
During parallel operation, two UPS accumulator batteries are still that capacity difference, voltage difference are higher, and program operation
More conventional manual switching cabinet is increasingly complex, there is also simultaneously charged in the case of the operation of plug fuse, need dimension
Protect that personnel's in emergency circumstances logical thinking is clear, skilled operation, therefore still have many safety when parallel operation
Hidden danger.
When the shortcoming of current UPS accumulator battery switching cabinet is due to a UPS inversion fault, two
It is load supplying that the accumulator battery of UPS can not be concurrently accessed properly functioning UPS inverter immediately, causes
Accumulator battery length actual time is significantly reduced, and still suffers from potential safety hazard when parallel operation.
Summary of the invention
The present invention proposes a kind of UPS accumulator battery automatic switching control equipment, to solve present in prior art
When one UPS inversion fault carries out manual switching, accumulator battery length actual time is significantly reduced, in parallel operation
Time still suffer from the technical problem of potential safety hazard.
The embodiment of the present invention provides a kind of UPS device, and this device includes at least two group UPS unit, often groups
UPS unit includes:
One UPS inverter；
One UPS accumulator battery；
One switching subelement, has the input node that the UPS accumulator battery with described UPS unit is connected,
And the output node connected one to one with the input of the UPS inverter of described UPS unit；
One controls subelement, for automatically turning on described input node and described output node according to malfunction
In the electrical connection of.
Further, described switching subelement is a single pole multiple throw.
Specifically, this UPS device includes: a UPS unit and the 2nd UPS unit, wherein said cuts
Changing subelement is single-pole double throw electromagnetic switch.
Further, described control subelement includes:
Turn on when municipal power failure occurs, the first switch otherwise disconnected；
Turn on when fault of converter occurs, the second switch otherwise disconnected；
It is connected with power supply by described first switch and second switch, and under energization action, produces magnetic force, change
Become the connection of described single-pole double-throw switch (SPDT) so that the UPS accumulator battery outfan of described UPS unit is with another
The coil that the input of the UPS inverter of one UPS unit connects.
Further, often group UPS unit also includes:
3rd switch, is connected between input node and the UPS accumulator battery of switching subelement.
Specifically, a described UPS unit includes a UPS inverter, a UPS accumulator battery,
First switching subelement and first controls subelement, and described 2nd UPS unit includes the 2nd UPS inverter,
2nd UPS accumulator battery, the second switching subelement and second controls subelement,
Wherein, described first control subelement specifically includes:
The first externally fed breakdown switch and the first fault of converter that first coil is connected with first coil are opened
Closing, first coil is connected with power supply by the first externally fed breakdown switch and the first fault of converter switch,
Under energization action, produce magnetic force, change the connection of described first switching subelement；
Described second controls subelement specifically includes:
The second externally fed breakdown switch and the second fault of converter that second coil and the second coil connect are opened
Closing, the second coil is connected with power supply by the second externally fed breakdown switch and the second fault of converter switch,
Under energization action, produce magnetic force, change the connection of described second switching subelement.
Specifically, described first externally fed breakdown switch and the second externally fed breakdown switch are at externally fed
Disconnect time normal, the conducting when outside power failure；
Described first fault of converter switch is in disconnection when a UPS inverter is normal, at a UPS
Turn on when inverter breaks down；
Described second fault of converter switch is in disconnection when the 2nd UPS inverter is normal, at the 2nd UPS
Turn on when inverter breaks down.
Specifically, when externally fed is normal or externally fed breaks down, described first switching subelement is even
Connecing a described UPS accumulator battery and a UPS inverter, described second switching subelement connects described
2nd UPS accumulator battery and the 2nd UPS inverter；
When outside power failure and a UPS fault of converter, described first switching subelement is even
Connect a described UPS accumulator battery and described 2nd UPS inverter；
When outside power failure and the 2nd UPS fault of converter, described second switching subelement is even
Connect described 2nd UPS accumulator battery and a described UPS inverter.
The present invention is made when municipal power failure and a UPS fault of converter occur simultaneously by switching subelement
Time, the accumulator battery of two UPS automatically accesses in properly functioning UPS inverter, it is achieved thereby that two
The accumulator battery of platform UPS is load supplying the most simultaneously.Due to Maintenance free human users, dual power supply is cut
Changing switch can auto-action, the accumulator battery of two UPS auto parallel Connection immediately, therefore ups system immediately
The General Logistics Department for duration without reduction, and in parallel access do not have the generation of transient high-current and electric arc the most in parallel time without peace
Full hidden danger.
Accompanying drawing explanation
The inventive concept of the present invention below by being described with reference to the accompanying drawings and will be introduced, and wherein accompanying drawing includes:
Fig. 1 represents the structure chart of UPS accumulator battery manual switching cabinet in prior art；
Fig. 2 represents the structure chart of the UPS device that the present invention provides；
Fig. 3 represents the electric drawings of the UPS device that the present invention provides.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are illustrated, the preferred embodiment that this part describes
It is merely to illustrate and explains the present invention, being not intended to limit the present invention.
The embodiment of the present invention provides a kind of UPS device, and this device includes at least two group UPS unit, often groups
UPS unit includes:
One UPS inverter；
One UPS accumulator battery；
One switching subelement, has the input node that the UPS accumulator battery with described UPS unit is connected,
And the output node connected one to one with the input of the UPS inverter of described UPS unit；
One controls subelement, for automatically turning on described input node and described output node according to malfunction
In the electrical connection of.
Further, described switching subelement is a single pole multiple throw.
Specifically, this UPS device includes: a UPS unit and the 2nd UPS unit, wherein said cuts
Changing subelement is single-pole double throw electromagnetic switch.
Further, described control subelement includes:
Turn on when municipal power failure occurs, the first switch otherwise disconnected；
Turn on when fault of converter occurs, the second switch otherwise disconnected；
It is connected with power supply by described first switch and second switch, and under energization action, produces magnetic force, change
Become the connection of described single-pole double-throw switch (SPDT) so that the UPS accumulator battery outfan of described UPS unit is with another
The coil that the input of the UPS inverter of one UPS unit connects.
Further, often group UPS unit also includes:
3rd switch, is connected between input node and the UPS accumulator battery of switching subelement.
Specifically, a described UPS unit includes a UPS inverter, a UPS accumulator battery,
First switching subelement and first controls subelement, and described 2nd UPS unit includes the 2nd UPS inverter,
2nd UPS accumulator battery, the second switching subelement and second controls subelement,
Wherein, described first control subelement specifically includes:
The first externally fed breakdown switch and the first fault of converter that first coil is connected with first coil are opened
Closing, first coil is connected with power supply by the first externally fed breakdown switch and the first fault of converter switch,
Under energization action, produce magnetic force, change the connection of described first switching subelement；
Described second controls subelement specifically includes:
The second externally fed breakdown switch and the second fault of converter that second coil and the second coil connect are opened
Closing, the second coil is connected with power supply by the second externally fed breakdown switch and the second fault of converter switch,
Under energization action, produce magnetic force, change the connection of described second switching subelement.
Specifically, described first externally fed breakdown switch and the second externally fed breakdown switch are at externally fed
Disconnect time normal, the conducting when outside power failure；
Described first fault of converter switch is in disconnection when a UPS inverter is normal, at a UPS
Turn on when inverter breaks down；
Described second fault of converter switch is in disconnection when the 2nd UPS inverter is normal, at the 2nd UPS
Turn on when inverter breaks down.
Specifically, when externally fed is normal or externally fed breaks down, described first switching subelement is even
Connecing a described UPS accumulator battery and a UPS inverter, described second switching subelement connects described
2nd UPS accumulator battery and the 2nd UPS inverter；
When outside power failure and a UPS fault of converter, described first switching subelement is even
Connect a described UPS accumulator battery and described 2nd UPS inverter；
When outside power failure and the 2nd UPS fault of converter, described second switching subelement is even
Connect described 2nd UPS accumulator battery and a described UPS inverter.
The present invention is made when municipal power failure and a UPS fault of converter occur simultaneously by switching subelement
Time, the accumulator battery of two UPS automatically accesses in properly functioning UPS inverter, it is achieved thereby that two
The accumulator battery of platform UPS is load supplying the most simultaneously.Due to Maintenance free human users, dual power supply is cut
Changing switch can auto-action, the accumulator battery of two UPS auto parallel Connection immediately, therefore ups system immediately
The General Logistics Department for duration without reduction, and in parallel access do not have the generation of transient high-current and electric arc the most in parallel time without peace
Full hidden danger.
The UPS device of the present invention is described in detail by 2-3 below in conjunction with the accompanying drawings, as in figure 2 it is shown, should
UPS device includes UPS1 unit (the i.e. the oneth UPS unit) and UPS2 unit, and (the i.e. the 2nd UPS is mono-
Unit).UPS1 unit includes UPS1 inverter (the i.e. the oneth UPS inverter), switching switch Q1(i.e.
First switching subelement), switch controller C1(that is first control subelement) and UPS1 accumulator battery is (i.e.
Oneth UPS accumulator battery).UPS2 unit includes UPS2 inverter (the i.e. the 2nd UPS inverter), cuts
Change switch Q2(that is second and switch subelement), switch controller C2(that is second control subelement) and UPS2
Accumulator battery (the i.e. the 2nd UPS accumulator battery).Switching switch Q1 and Q2 can be single-pole double-throw switch (SPDT),
It is specially switching switch Q1 and there is the input node being connected with UPS1 accumulator battery, and inverse with UPS1
Become the output node that the input of device and UPS2 inverter connects one to one.Switching switch Q2 have with
UPS2 accumulator battery connect input node, and with UPS1 inverter and the input of UPS2 inverter
The output node that end connects one to one.When outside normal power supply, UPS1 inverter is switched by switching
Q1 Yu UPS1 accumulator battery is changed even, and UPS2 inverter is by switching switch Q2 Yu UPS2 accumulator battery
Connect, respectively UPS1 accumulator battery and UPS2 battery charging.When there is externally fed fault,
UPS1 accumulator battery keeps the connection with UPS1 inverter, and UPS2 accumulator battery keeps and UPS2 inversion
The connection of device, but UPS1 accumulator battery and UPS2 accumulator battery are respectively by UPS1 inverter and UPS2
Inverter is load supplying.When there is externally fed fault and UPS1 fault of converter, switch controller
C1 controls switching switch Q1 and UPS1 accumulator battery is switched to and UPS2 from being connected with UPS1 inverter
Inverter connects, and UPS1 accumulator battery and UPS2 accumulator battery parallel connection are load by UPS2 inverter
Power supply.When there is externally fed fault and UPS2 fault of converter, switch controller C2 controls switching
UPS2 accumulator battery is switched to be connected with UPS1 inverter from being connected with UPS2 inverter by switch Q2,
UPS1 accumulator battery and UPS2 accumulator battery parallel connection are load supplying by UPS1 inverter.Additionally,
Also include that the cell switch Q3(being connected between switching switch Q1 input node and UPS1 accumulator battery is
3rd switch) and be connected to switch the cell switch Q4 between switch Q2 input node and UPS2 reservoir group
(the i.e. the 3rd switch).
As it is shown on figure 3, switch controller C1 specifically includes coil MC1(i.e. first coil) and coil
Externally fed breakdown switch K1-1(that is first externally fed breakdown switch that MC1 connects) and and coil
UPS1 fault of converter switch K1-2(that is first fault of converter switch that MC1 connects).Coil MC1
By externally fed fault contact switch K1-1 and UPS1 fault of converter contact switch K1-2 with power supply even
Connect, under energization action, produce magnetic force, change the connection of switching switch Q1.Switch controller C2 includes
Coil MC2(that is second coil) externally fed breakdown switch K2-1(that is that be connected with coil MC2
Two externally fed breakdown switches) and the UPS2 fault of converter switch K2-2(that is connected with coil MC2 is i.e.
Second fault of converter switch).Coil MC2 passes through externally fed fault contact switch K2-1 and UPS1
Fault of converter contact switch K2-2 is connected with power supply, produces magnetic force under energization action, changes switching and opens
Close the connection of Q2.Externally fed breakdown switch K1-1 and K2-1 disconnects when externally fed is normal, outside
Turn on during portion's power failure.UPS1 fault of converter switch K1-2 when UPS1 inverter is normal at
In disconnection, turn on when UPS1 inverter breaks down.UPS2 fault of converter switch K2-2 is at UPS2
It is in disconnection when inverter is normal, turns on when UPS2 inverter breaks down.
Referring to Fig. 3, describe in detail under different conditions, the working condition of UPS device:
1, normally work:
Breakdown switch K1-1, K2-1 and K1-2, K2-2 all disconnect, coil MC1 and MC2 dead electricity,
Switching switch Q1 and Q2 is in normal condition, throws respectively at UPS1 inverter and UPS2 inverter
On, UPS is respectively its battery charging.
2, municipal power failure:
Breakdown switch K1-1 and K2-1 turn on, breakdown switch K1-2 and K2-2 disconnect, coil MC1 and
MC2 dead electricity, switching switch Q1 and Q2 is in normal condition, throws respectively at UPS1 inverter and UPS2
On inverter, UPS1 accumulator battery and UPS2 accumulator battery are respectively through UPS1 inverter and UPS2
Inverter is load supplying.
3, municipal power failure and UPS1 fault of converter:
Breakdown switch K1-1, K2-1 and K1-2 turn on, and breakdown switch K2-2 disconnects.Coil MC1 leads to
Electricity produces magnetic force, makes switching switch Q1 throw to UPS2 inverter, and UPS1 accumulator battery accesses UPS2
Inverter.Coil MC2 dead electricity, switching switch Q2 is in normal condition, throws at UPS2 inverter
On, UPS2 accumulator battery accesses UPS2 inverter.UPS1 accumulator battery and UPS2 accumulator battery are in parallel
It is load supplying through UPS2 inverter.
4, municipal power failure and UPS2 fault of converter:
Breakdown switch K1-1, K2-1 and K2-2 turn on, and breakdown switch K1-2 disconnects.Coil MC2 leads to
Electricity produces magnetic force, makes switching switch Q2 throw to UPS1 inverter, and UPS2 accumulator battery accesses UPS1
Inverter.Coil MC1 dead electricity, switching switch Q1 is in normal condition, throws at UPS1 inverter
On, UPS1 accumulator battery accesses UPS1 inverter.UPS1 accumulator battery and UPS2 accumulator battery are in parallel
It is load supplying through UPS1 inverter.
The present invention makes when municipal power failure and a UPS fault occur simultaneously by changeable switch, and two
The accumulator battery of platform UPS automatically accesses in properly functioning UPS inverter, it is achieved thereby that two UPS
Accumulator battery be load supplying the most simultaneously.Due to Maintenance free human users, double power supply converting switch meeting
Auto-action immediately, the accumulator battery of two UPS auto parallel Connection immediately, therefore the ups system General Logistics Department for time
Long without reduction, and in parallel access do not have the generation of transient high-current and electric arc the most in parallel time without potential safety hazard.
Although the preferred embodiments of the present invention provide a kind of UPS device with two groups of UPS unit, but
The invention is not restricted to this.The UPS device that the present invention provides can have the UPS unit of more than three groups.?
Often in group UPS unit, switching subelement has defeated with what the UPS accumulator battery of described UPS unit was connected
Ingress, and the output joint connected one to one with the input of the UPS inverter of all UPS unit
Point, such as single pole multiple throw；Control subelement and automatically turn on described input node and institute according to malfunction
State the electrical connection of in output node.
The above is the preferred embodiment of the present invention, it is noted that for the common skill of the art
For art personnel, on the premise of without departing from principle of the present invention, it is also possible to make some improvements and modifications,
These improvements and modifications also should be regarded as protection scope of the present invention.
Claims (5)
1. a UPS device, it is characterised in that this device includes at least two group UPS unit, often groups
UPS unit includes:
One UPS inverter；
One UPS accumulator battery；
One switching subelement, has the input node that the UPS accumulator battery with described UPS unit is connected,
And the output node connected one to one with the input of the UPS inverter of described UPS unit；
One controls subelement, for automatically turning on described input node and described output node according to malfunction
In the electrical connection of；
Wherein, described switching subelement is single-pole double throw electromagnetic switch, and described at least two group UPS unit are:
Oneth UPS unit and the 2nd UPS unit；
When outside normal power supply, UPS inverter is by corresponding switching subelement and UPS accumulator battery
Connecting, when there is externally fed fault, UPS accumulator battery keeps the connection with UPS inverter, UPS
Accumulator battery is load supplying by corresponding UPS inverter；
Described control subelement includes:
Turn on when municipal power failure occurs, the first switch otherwise disconnected；
Turn on when fault of converter occurs, the second switch otherwise disconnected；
It is connected with power supply by described first switch and second switch, and under energization action, produces magnetic force, change
Become the connection of described single-pole double throw electromagnetic switch so that the UPS accumulator battery outfan of described UPS unit
The coil being connected with the input of the UPS inverter of another UPS unit.
UPS device the most according to claim 1, it is characterised in that often group UPS unit also includes:
3rd switch, is connected between input node and the UPS accumulator battery of switching subelement.
UPS device the most according to claim 2, it is characterised in that a described UPS unit bag
Including a UPS inverter, a UPS accumulator battery, the first switching subelement and first controls subelement,
Described 2nd UPS unit includes the 2nd UPS inverter, the 2nd UPS accumulator battery, and the second switching is single
Unit and second controls subelement,
Wherein, described first control subelement specifically includes:
The first externally fed breakdown switch and the first fault of converter that first coil is connected with first coil are opened
Closing, first coil is connected with power supply by the first externally fed breakdown switch and the first fault of converter switch,
Under energization action, produce magnetic force, change the connection of described first switching subelement；
Described second controls subelement specifically includes:
The second externally fed breakdown switch and the second fault of converter that second coil and the second coil connect are opened
Closing, the second coil is connected with power supply by the second externally fed breakdown switch and the second fault of converter switch,
Under energization action, produce magnetic force, change the connection of described second switching subelement.
UPS device the most according to claim 3, it is characterised in that
Described first externally fed breakdown switch and the second externally fed breakdown switch are when externally fed is normal
Disconnect, the conducting when outside power failure；
Described first fault of converter switch is in disconnection when a UPS inverter is normal, at a UPS
Turn on when inverter breaks down；
Described second fault of converter switch is in disconnection when the 2nd UPS inverter is normal, at the 2nd UPS
Turn on when inverter breaks down.
UPS device the most according to claim 3, it is characterised in that
When externally fed is normal or externally fed breaks down, described first switching subelement connects described the
One UPS accumulator battery and a UPS inverter, described second switching subelement connects described 2nd UPS
Accumulator battery and the 2nd UPS inverter；
When outside power failure and a UPS fault of converter, described first switching subelement is even
Connect a described UPS accumulator battery and described 2nd UPS inverter；
When outside power failure and the 2nd UPS fault of converter, described second switching subelement is even
Connect described 2nd UPS accumulator battery and a described UPS inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210562318.XA CN103887872B (en) | 2012-12-21 | 2012-12-21 | UPS device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210562318.XA CN103887872B (en) | 2012-12-21 | 2012-12-21 | UPS device |
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| CN103887872A CN103887872A (en) | 2014-06-25 |
| CN103887872B true CN103887872B (en) | 2016-12-28 |
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| CN201210562318.XA Active CN103887872B (en) | 2012-12-21 | 2012-12-21 | UPS device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108092355A (en) * | 2017-12-14 | 2018-05-29 | 北京金风科创风电设备有限公司 | Charging control device and method of variable pitch system and wind generating set |
| CN109586395A (en) * | 2018-10-16 | 2019-04-05 | 深圳市科陆电子科技股份有限公司 | Uninterrupted power supply intelligently switches and monitoring method |
| CN112751407A (en) * | 2019-10-31 | 2021-05-04 | 阿里巴巴集团控股有限公司 | Data center power supply system and control method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025187A (en) * | 2010-12-24 | 2011-04-20 | 深圳市华通电气设备有限公司 | Integrated UPS (Uninterrupted Power Supply) parallel system of underground weak current |
| CN202997690U (en) * | 2012-12-21 | 2013-06-12 | 中国移动通信集团广东有限公司 | UPS device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020153865A1 (en) * | 2001-04-19 | 2002-10-24 | Nelson James E. | Uninterruptible power supply system having an NiMH or Li-ion battery |
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2012
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102025187A (en) * | 2010-12-24 | 2011-04-20 | 深圳市华通电气设备有限公司 | Integrated UPS (Uninterrupted Power Supply) parallel system of underground weak current |
| CN202997690U (en) * | 2012-12-21 | 2013-06-12 | 中国移动通信集团广东有限公司 | UPS device |
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