CN210092959U - On-line AC uninterrupted power supply system - Google Patents
On-line AC uninterrupted power supply system Download PDFInfo
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- CN210092959U CN210092959U CN201921089012.0U CN201921089012U CN210092959U CN 210092959 U CN210092959 U CN 210092959U CN 201921089012 U CN201921089012 U CN 201921089012U CN 210092959 U CN210092959 U CN 210092959U
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Abstract
The disclosure provides an online alternating current uninterruptible power supply system, which comprises a restorable circuit breaker, a first relay, an AC/DC converter, a DC/AC converter, a battery pack and a control module. Wherein the recoverable circuit breaker is electrically connected to the ac input. The first relay has a first terminal electrically connected to the resettable circuit breaker, a second terminal electrically connected to the AC load, and a third terminal electrically connected to the AC/DC converter. The DC/AC converter is connected with the AC/DC converter through a direct current bus, and the battery assembly is coupled to the direct current bus. The control module is used for monitoring the load current of the alternating current load, when the online alternating current uninterruptible power supply system works in a bypass mode and the alternating current load or the electrical connection between the DC/AC converter and the alternating current load is short-circuited, the restorable circuit breaker is automatically disconnected, and then the closing control of the restorable circuit breaker and the control of the online alternating current uninterruptible power supply system to enter an alternating current power supply mode or an online power supply mode are executed by the control module.
Description
Technical Field
The present disclosure relates to uninterruptible power supply systems, and more particularly, to an online ac uninterruptible power supply system.
Background
At present, China uninterruptible power supply systems are rapidly developed, wherein the input end of the current alternating current uninterruptible power supply system is subjected to short-circuit protection in a mode of series connection of fuses, and when the alternating current uninterruptible power supply system works in a bypass mode and an alternating current load or the electrical connection of a DC/AC converter and the alternating current load is short-circuited, the fuses can be fused to realize short-circuit protection. However, when the fuse is blown out, the uninterruptible power supply system can be restarted to operate after the fuse is manually replaced by a worker on the site, which results in waste of labor cost.
Therefore, it is desirable to provide an online AC ups system, which can automatically recover to a normal operating state without manual intervention after the AC load or the electrical connection between the DC/AC converter and the AC load is short-circuited when the online AC ups system operates in a bypass mode.
SUMMERY OF THE UTILITY MODEL
An object of the present disclosure is to provide an online ac uninterruptible power supply system that overcomes, at least in part, one or more of the problems due to limitations and disadvantages of the related art.
To achieve the above object, the present disclosure provides an online ac uninterruptible power supply system, comprising:
a resettable circuit breaker electrically connected to the AC input;
a first relay comprising a first terminal, a second terminal, and a third terminal, the first terminal of the first relay being electrically connected to the resettable circuit breaker, the second terminal of the first relay being electrically connected to an ac load;
an AC/DC converter electrically connected to the third terminal of the first relay;
the DC/AC converter is connected with the AC/DC converter through a direct current bus, wherein the output end of the AC/DC converter and the input end of the DC/AC converter are both connected to the direct current bus, and the output end of the DC/AC converter is electrically connected with the alternating current load;
a battery assembly electrically coupled to the DC bus; and
the control module is electrically coupled to the restorable circuit breaker, the first relay, the AC/DC converter and the DC/AC converter, and is further configured to monitor a load current of the alternating current load, when the online alternating current uninterruptible power supply system operates in a bypass mode and the alternating current load or an electrical connection between the DC/AC converter and the alternating current load is short-circuited, the restorable circuit breaker is automatically opened, and under the condition that the restorable circuit breaker is automatically opened, closing control of the restorable circuit breaker and control of the online alternating current uninterruptible power supply system to enter an alternating current power supply mode or an online power supply mode are performed by the control module.
In some embodiments of the present disclosure, an AC input is connected to a first relay through a recoverable circuit breaker, when the online AC ups system operates in a bypass mode and the AC load or an electrical connection between the DC/AC converter and the AC load is short-circuited, the recoverable circuit breaker is automatically disconnected, and when the recoverable circuit breaker is automatically disconnected, closing control of the recoverable circuit breaker and control of the online AC ups system to enter an AC power supply mode or an online power supply mode are performed by the control module. When the alternating current load or the short circuit condition of the electrical connection between the DC/AC converter and the alternating current load disappears, the control module controls the restorable circuit breaker to be closed and the online alternating current uninterruptible power supply system to work in a bypass mode again. According to the method and the device, after the alternating current load end is short-circuited, the on-line alternating current uninterruptible power supply system can restore normal work without manual interference, the operation process is simplified, the execution efficiency is greatly improved, and errors possibly caused by human are avoided.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
Fig. 1 schematically illustrates an online ac uninterruptible power supply system of an exemplary first embodiment of the present disclosure.
Fig. 2 schematically illustrates an online ac uninterruptible power supply system of an exemplary second embodiment of the present disclosure.
Fig. 3 schematically illustrates an online ac uninterruptible power supply system according to an exemplary third embodiment of the present disclosure.
Detailed Description
Some exemplary embodiments that incorporate the features and advantages of the present disclosure will be described in detail in the specification which follows. It is to be understood that the disclosure is capable of various modifications in various embodiments without departing from the scope of the disclosure, and that the description and drawings are to be regarded as illustrative in nature, and not as restrictive.
The ac ups system is divided into an on-line ac ups system, an on-line interactive ac ups system, and an off-line ac ups system according to hardware differences. The present disclosure is applicable to online ac uninterruptible power supply systems. Fig. 1 schematically illustrates an online ac uninterruptible power supply system 1 of an exemplary first embodiment of the present disclosure, including: a resettable circuit breaker 10 electrically connected to the ac input ACin; a first relay 20 including a first terminal 200, a second terminal 201, and a third terminal 202, the first terminal 200 of the first relay 20 being electrically connected to the resettable circuit breaker 10, the second terminal 201 of the first relay 20 being electrically connected to the ac load 2; an AC/DC converter 30 electrically connected to the third terminal 202 of the first relay 20; a DC/AC converter 40 connected to the AC/DC converter 30 via a DC bus, wherein an output terminal of the AC/DC converter 30 and an input terminal of the DC/AC converter 40 are both connected to the DC bus, and an output terminal of the DC/AC converter 40 is electrically connected to the AC load 2; a battery assembly 50 electrically coupled to the dc bus; and a control module 60 electrically coupled to the recoverable circuit breaker 10, the first relay 20, the AC/DC converter 30, and the DC/AC converter 40, wherein the control module 60 is further configured to monitor a load current of the AC load 2, the recoverable circuit breaker 10 is automatically disconnected when the online AC ups system 1 operates in a bypass mode and the AC load 2 is short-circuited, or when an electrical connection between the DC/AC converter 40 and the AC load 2 is short-circuited, and the control module 60 performs a closing control of the recoverable circuit breaker 10 and a control of the online AC ups system 1 to enter an AC power supply mode or an online power supply mode when the recoverable circuit breaker 10 is automatically disconnected.
When the online ac ups system 1 operates in the bypass mode, the first terminal 200 of the first relay 20 is connected to the second terminal 201 of the first relay 20, so that the ac input ACin directly supplies power to the ac load 2.
When the online AC ups system 1 operates in the online power supply mode, the first relay 20 is disconnected or the first terminal 200 of the first relay 20 is connected to the third terminal 202, and the battery assembly 50 supplies power to the AC load 2 through the DC/AC converter 40.
When the online AC ups system 1 operates in the AC power supply mode, the first terminal 200 of the first relay 20 is connected to the third terminal 202, and the AC input ACin supplies power to the AC load 2 through the AC/DC converter 30 and the DC/AC converter 40.
In one embodiment, the online ac ups system 1 can operate in one of an ac power mode, a bypass mode, and an online power mode. When the AC input ACin does not meet the specification, the online AC ups system 1 operates in an AC power supply mode, and the AC input ACin is converted into an AC voltage meeting the specification by the AC/DC converter 30 and the DC/AC converter 40, and then supplies power to the AC load 2. When the ac input ACin meets the specification, the online ac uninterruptible power supply system 1 operates in a bypass mode, and the ac input ACin directly supplies power to the ac load. When the AC input ACin is powered down, the online AC uninterruptible power supply system 1 operates in an online power supply mode, and the battery pack 50 is converted into an AC voltage conforming to the specification by the DC/AC converter 40, and then supplies power to the AC load 2.
In another embodiment, when the online AC ups system 1 is operating in a bypass mode and the AC load 2 is short-circuited, or the electrical connection between the DC/AC converter 40 and the AC load 2 is short-circuited, i.e. the load is short-circuited, the recoverable circuit breaker 10 automatically opens. In this case, the closing control of the resettable circuit breaker 10 and the control of the on-line ac ups system 1 to enter the ac power supply mode or the on-line power supply mode are performed by the control module 60.
In another embodiment, after the online AC ups system 1 operates in the bypass mode and the AC load 2 is short-circuited and the resettable circuit breaker 10 is automatically turned off, the control module 60 may control the online AC ups system 1 to enter the online power supply mode after a first time, and at this time, the battery assembly 50 supplies power to the AC load 2 through the DC/AC converter 40. The control module 60 controls the DC/AC converter 40 to output the current having the current value within the limit value to the alternating current load 5, and detects whether the state duration in which the current of the alternating current load 2 exceeds the limit value reaches the second time. If the state duration that the current of the alternating current load 2 exceeds the limit value reaches the second time, the control module 60 determines that the online alternating current uninterruptible power supply system 1 is abnormal, so the control module 60 sends an alarm signal. If the state duration that the current of the alternating current load 2 exceeds the limit value does not reach the second time, the control module 60 judges that the short-circuit fault of the online alternating current uninterruptible power supply system 1 is recovered, the control module 60 controls the restorable circuit breaker 10 to be closed, and controls the online uninterruptible power supply system 1 to be recovered to work in the bypass mode.
In another embodiment, after the online AC ups system 1 operates in the bypass mode and the AC load 2 is short-circuited and the resettable circuit breaker 10 is automatically turned off, the control module 60 controls the online AC ups system 1 to enter the online power supply mode after a first time, and at this time, the battery assembly 50 supplies power to the AC load 2 through the DC/AC converter 40. Meanwhile, the control module 60 controls the recoverable circuit breaker 10 to close, controls the DC/AC converter 40 to output a current having a current value within a limit value to the alternating current load 2, and detects whether a state duration in which the current of the alternating current load 2 exceeds the limit value reaches a second time. If the state duration that the current of the alternating current load 2 exceeds the limit value reaches the second time, the control module 60 judges that the online alternating current uninterruptible power supply system 1 is abnormal, and the control module 60 sends an alarm signal. If the state duration that the current of the alternating current load 2 exceeds the limit value does not reach the second time, the control module 60 judges that the short-circuit fault of the online alternating current uninterruptible power supply system 1 is recovered, and the control module 60 controls the online alternating current uninterruptible power supply system 1 to recover to work in the bypass mode.
In another embodiment, after the online ac ups system 1 operates in the bypass mode and the ac load 2 is short-circuited and the recoverable circuit breaker 10 is automatically opened, the control module 60 controls the recoverable circuit breaker 10 to close and controls the online ac ups system 1 to enter the ac power supply mode after a first time. At this time, the AC input ACin supplies power to the AC load 2 through the AC/DC converter 30 and the DC/AC converter 40. The control module 60 controls the DC/AC converter 40 to output the current having the current value within the limit value to the alternating current load 2, and detects whether the state duration in which the current of the alternating current load 2 exceeds the limit value reaches the second time. If the state duration that the current of the alternating current load 2 exceeds the limit value reaches the second time, the control module 60 judges that the online alternating current uninterruptible power supply system 1 is abnormal, and the control module 60 sends an alarm signal. If the state duration that the current of the alternating current load 2 exceeds the limit value does not reach the second time, the control module 60 judges that the short-circuit fault of the online alternating current uninterruptible power supply system 1 is recovered, and the control module 60 controls the online alternating current uninterruptible power supply system 1 to recover to work in the bypass mode.
In the above embodiment, the first time may be 30ms, and the second time may be 120ms, and it should be noted that the first time and the second time may be adjusted according to actual needs, and are not limited thereto.
Fig. 2 schematically illustrates an online ac uninterruptible power supply system of an exemplary second embodiment of the present disclosure. In fig. 2, the online ac ups system 1 further includes a DC/DC converter 70 disposed between the battery assembly 50 and the DC bus. In this embodiment, the voltage of the battery pack 50 is converted into a DC bus voltage by the DC/DC converter 70 and supplied to the DC/AC converter 40.
Fig. 3 schematically illustrates an online ac uninterruptible power supply system according to an exemplary third embodiment of the present disclosure. In fig. 3, the online AC uninterruptible power supply system 1 further includes a second relay 80 electrically connected to the DC/AC converter 40 and the AC load 2, wherein a first terminal 800 of the second relay 80 is electrically connected to the AC load 2, a second terminal 801 of the second relay 80 is electrically connected to the second terminal 201 of the first relay 20, and a third terminal 802 of the second relay 80 is electrically connected to the DC/AC converter 40. When the online ac ups system 1 operates in the bypass mode, the first terminal 800 and the second terminal 801 of the second relay 80 are connected. When the online ac ups system operates in the ac power mode, the second relay 80 is turned off or the first terminal 800 of the second relay 80 is connected to the third terminal 802. When the online ac ups system operates in the online power mode, the second relay 80 is turned off or the first terminal 800 of the second relay 80 is connected to the third terminal 802.
In some embodiments, the control module 60 is an MCU controller.
In some embodiments, the recoverable circuit breaker 1 comprises a motor, a driving mechanism and a mechanical switch, and the control module 60 controls the motor to drive the driving mechanism to act, so as to drive the mechanical switch to be opened or closed.
In some embodiments, the ac input ACin may be a three-phase ac input or a single-phase ac input, and the ac load 2 may be a three-phase load or a single-phase load.
In summary, the present disclosure provides an online AC uninterruptible power supply system, which includes a recoverable circuit breaker, a first relay, an AC/DC converter, a DC/AC converter, a battery pack, and a control module. When the on-line AC UPS system works in a bypass mode and an AC load or the electrical connection between a DC/AC converter and the AC load is short-circuited, the restorable circuit breaker can be automatically disconnected. Under the condition that the restorable circuit breaker is automatically disconnected, the control module controls the restorable circuit breaker to be closed and controls the online alternating current uninterruptible power supply system to enter an alternating current power supply mode or an online power supply mode. Namely, after the on-line AC UPS system works in a bypass mode and the AC load end is short-circuited, the restorable circuit breaker can be closed without manual interference, so that the on-line AC UPS system can be normally restored, the operation process is simplified, the execution efficiency is greatly improved, and errors possibly caused by human factors are avoided.
It should be noted that the above-mentioned embodiments illustrate only preferred embodiments of the disclosure, and the disclosure is not limited to the described embodiments, as the scope of the disclosure is determined by the claims. And that this disclosure will be modified by those skilled in the art as deemed to be within the scope and spirit of the appended claims.
Claims (12)
1. An online ac uninterruptible power supply system, comprising:
a resettable circuit breaker electrically connected to the AC input;
a first relay comprising a first terminal, a second terminal, and a third terminal, the first terminal of the first relay being electrically connected to the resettable circuit breaker, the second terminal of the first relay being electrically connected to an ac load;
an AC/DC converter electrically connected to the third terminal of the first relay;
the DC/AC converter is connected with the AC/DC converter through a direct current bus, wherein the output end of the AC/DC converter and the input end of the DC/AC converter are both connected to the direct current bus, and the output end of the DC/AC converter is electrically connected with the alternating current load;
a battery assembly electrically coupled to the DC bus; and
the control module is electrically coupled to the restorable circuit breaker, the first relay, the AC/DC converter and the DC/AC converter, and is further configured to monitor a load current of the alternating current load, when the online alternating current uninterruptible power supply system operates in a bypass mode and the alternating current load or an electrical connection between the DC/AC converter and the alternating current load is short-circuited, the restorable circuit breaker is automatically opened, and under the condition that the restorable circuit breaker is automatically opened, closing control of the restorable circuit breaker and control of the online alternating current uninterruptible power supply system to enter an alternating current power supply mode or an online power supply mode are performed by the control module.
2. The system according to claim 1, wherein when the restorable circuit breaker is automatically opened and a first time elapses, the control module controls the system to enter an online power supply mode, the control module detects whether a duration of a state in which a current of the ac load exceeds a limit value reaches a second time, and if the duration of the state reaches the second time, the control module sends an alarm signal, and if the duration of the state does not reach the second time, the control module controls the restorable circuit breaker to be closed and controls the system to resume operating in a bypass mode.
3. The system according to claim 1, wherein when the restorable circuit breaker is automatically opened and a first time elapses, the control module controls the system to enter an online power supply mode, the control module controls the restorable circuit breaker to be closed, the control module detects whether a duration of a state in which a current of the load exceeds a limit value reaches a second time, the control module sends an alarm signal if the duration of the state reaches the second time, and the control module controls the system to resume operating in a bypass mode if the duration of the state does not reach the second time.
4. The online alternating current uninterruptible power supply system according to claim 1, wherein the control module controls the restorable circuit breaker to close after a first time elapses after the restorable circuit breaker is automatically opened, the control module controls the online alternating current uninterruptible power supply system to enter an alternating current power supply mode, the control module detects whether a state duration in which a current of the load exceeds a limit value reaches a second time, if the state duration reaches the second time, the control module sends an alarm signal, and if the state duration does not reach the second time, the control module controls the online alternating current uninterruptible power supply system to resume operating in a bypass mode.
5. The online ac uninterruptible power supply system of any of claims 1 to 4, wherein the first terminal of the first relay is connected to the second terminal of the first relay when the online ac uninterruptible power supply system is operating in a bypass mode.
6. The online AC ups system of any one of claims 1 to 3, wherein when the online AC ups system is operating in an online power mode, the first relay is open or the first terminal of the first relay is connected to the third terminal, and the battery assembly supplies power to the AC load through the DC/AC converter.
7. The online AC ups system of claim 1 or 4, wherein when the online AC ups system is operating in AC power mode, the first terminal of the first relay is connected to the third terminal, and the AC input supplies power to the AC load through the AC/DC converter and the DC/AC converter.
8. The online ac ups system of any one of claims 1 to 4 further comprising a DC/DC converter disposed between the battery pack and the DC bus.
9. The online AC uninterruptible power supply system of any of claims 1 to 4, further comprising a second relay electrically connected to the DC/AC converter and the AC load.
10. The online ac ups system of claim 6 wherein the online ac ups system operates in the online power mode when the ac input is powered down.
11. The online ac uninterruptible power supply system of claim 1, wherein the control module is an MCU controller.
12. The online alternating-current uninterruptible power supply system according to claim 1, wherein the recoverable circuit breaker includes a motor, a driving mechanism and a mechanical switch, and the control module controls the motor to drive the driving mechanism to operate, so as to drive the mechanical switch to open or close.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921089012.0U CN210092959U (en) | 2019-07-11 | 2019-07-11 | On-line AC uninterrupted power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921089012.0U CN210092959U (en) | 2019-07-11 | 2019-07-11 | On-line AC uninterrupted power supply system |
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| Publication Number | Publication Date |
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| CN210092959U true CN210092959U (en) | 2020-02-18 |
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| CN201921089012.0U Active CN210092959U (en) | 2019-07-11 | 2019-07-11 | On-line AC uninterrupted power supply system |
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- 2019-07-11 CN CN201921089012.0U patent/CN210092959U/en active Active
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