CN111900794A - UPS system for realizing feedback function - Google Patents

UPS system for realizing feedback function Download PDF

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Publication number
CN111900794A
CN111900794A CN202010885870.7A CN202010885870A CN111900794A CN 111900794 A CN111900794 A CN 111900794A CN 202010885870 A CN202010885870 A CN 202010885870A CN 111900794 A CN111900794 A CN 111900794A
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China
Prior art keywords
voltage
module
ups
mains
input
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Pending
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CN202010885870.7A
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Chinese (zh)
Inventor
吴朋
徐忠勇
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Lian Zheng Electronics Shenzhen Co Ltd
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Lian Zheng Electronics Shenzhen Co Ltd
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Priority to CN202010885870.7A priority Critical patent/CN111900794A/en
Publication of CN111900794A publication Critical patent/CN111900794A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Static Devices (AREA)

Abstract

The invention provides a UPS system for realizing a feedback function, which comprises a conduction and disconnection device, a UPS unit and a control protection device, wherein the conduction and disconnection device controls the electrical connection between a mains supply input and the UPS unit, and the control protection device is used for detecting the voltage of the mains supply and controlling the conduction and the disconnection of the conduction and disconnection device based on the detected mains supply voltage. The UPS system for realizing the feedback function has the advantages of simple operation, low cost, more stability and reliability, sensitive action and less time delay.

Description

UPS system for realizing feedback function
Technical Field
The invention belongs to the field of power supplies, and particularly relates to a UPS system for realizing a feedback function.
Background
An Uninterruptible Power Supply (UPS) is a power supply device that provides uninterrupted, high-quality, reliable ac power to a load, has functions of real-time protection and monitoring of the power supply state, and plays an important role in improving the power supply quality and ensuring the normal operation of the device.
Referring to fig. 1, a schematic circuit diagram of a UPS in the prior art is shown, where I/P is a mains input and O/P is an output. Under the normal working mode, the bypass switch 2 is switched off, the battery switch 7 is switched on, and the mains supply input reaches the output end through the input switch 1, the Power Factor Correction (PFC) module 5, the Inversion (INV) module 6 and the inversion switch 3 in sequence, and simultaneously charges the battery pack 8. When the commercial power trouble, the input is the reverse alternating current supply load under the battery mode, and at this moment, if the bypass trouble, UPS output alternating current will pass through bypass return circuit and insert the commercial power input side for the commercial power input side is electrified, brings the risk of electrocuteeing for operating personnel. To address this problem, the prior art solution is to provide a current sensor (CT)4 in the bypass circuit to detect the current in the bypass circuit in battery mode, and shut down the Inverter (INV) module 6 if the current threshold is exceeded, thereby cutting off the output. However, this requires changing the circuit settings and control software of the UPS, and is complicated and unreliable.
Disclosure of Invention
Therefore, an object of the present invention is to overcome the above-mentioned drawbacks of the prior art, and to provide a UPS system with a feedback function, which includes a switch-on/off device, a UPS unit, and a control protection device, wherein the switch-on/off device controls an electrical connection between a mains input and the UPS unit, and the control protection device is configured to detect a voltage of the mains and control on/off of the switch-on/off device based on the detected mains voltage.
According to the UPS system implementing the feedback function of the present invention, preferably, the on-off device is a controllable switch, a controllable module, a controllable relay, or a controllable contactor.
According to the UPS system implementing the feedback function of the present invention, preferably, the control protection device includes a voltage detection module, a voltage comparison module, and a driving module, wherein the voltage detection module is configured to detect an input mains voltage and convert the input mains voltage into a voltage range suitable for the voltage comparison module, the voltage comparison module is configured to determine whether the mains voltage is faulty and transmit a corresponding signal to the driving module, and the driving module is configured to turn off or turn on the on/off device.
According to the UPS system with the feedback function of the present invention, preferably, the voltage comparison module stores an operation voltage threshold, and when the voltage input to the voltage comparison module exceeds the operation voltage threshold, the voltage comparison module determines that the utility power is faulty and transmits a fault signal to the driving module, so that the driving module disconnects the conduction disconnection apparatus.
According to the UPS system implementing the feedback function of the present invention, preferably, the operation voltage threshold includes a low voltage operation threshold and a high voltage operation threshold, when the voltage input to the voltage comparison module is lower than the low voltage operation threshold or higher than the high voltage operation threshold, the voltage comparison module determines that the utility power is faulty and transmits a fault signal to the driving module, so that the driving module disconnects the conduction disconnecting device, and the UPS unit operates in the battery mode.
According to the UPS system implementing the feedback function of the present invention, preferably, the low voltage operation threshold is lower than a voltage lowest value of a commercial power operation mode of the UPS unit, and the high voltage operation threshold is higher than a voltage highest value of the commercial power operation mode of the UPS unit.
According to the UPS system implementing the feedback function of the present invention, preferably, when the voltage input to the voltage comparison module is between the low voltage operation threshold and the lowest voltage value of the UPS unit in the commercial power operation mode or between the highest voltage value of the UPS unit in the commercial power operation mode and the high voltage operation threshold, the driving module turns on the conduction/disconnection device, and the UPS operates in the battery mode.
According to the UPS system implementing the feedback function of the present invention, preferably, when the voltage input to the voltage comparing module is between a lowest voltage value and a highest voltage value of a commercial power operation mode of the UPS unit, the driving module turns on the on/off device, and the UPS operates in the commercial power mode.
According to the UPS system implementing the feedback function of the present invention, preferably, the control protection device further includes a filtering and pulse protection module, configured to filter and pulse protect the mains voltage and then input the mains voltage to the voltage detection module.
According to the UPS system implementing the feedback function of the present invention, preferably, the control protection device further includes a power module configured to supply power to the filtering and pulse protection module, the voltage detection module, the voltage comparison module, and the driving module.
Compared with the prior art, the invention has the advantages that: the method has the advantages of simple operation, low cost, more stability and reliability, sensitive action and less time delay.
Drawings
Embodiments of the invention are further described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic circuit diagram of a prior art UPS system;
fig. 2 is a schematic structural diagram of a UPS system implementing a feedback function according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a monitoring and protection device 40 according to an embodiment of the present invention; and
FIG. 4 shows the relationship of Ugrid-min, Ugrid-max, Umin and Umax for an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 2, a schematic structural diagram of a UPS system implementing a feedback function according to an embodiment of the present invention is shown, where 10 is a UPS unit, 20 is a load, 30 is a controllable switch, 40 is a monitoring protection device, L is a phase line, N is a zero line, V represents a monitoring voltage input, and COM represents a monitoring voltage input reference terminal. The mains supply input is connected to the UPS unit 10 through the controllable switch 30, the monitoring protection device 40 is used for detecting the mains supply voltage, when the mains supply input is overvoltage or undervoltage, the monitoring protection device 40 controls the controllable switch 30 to be switched off, and when the mains supply input is recovered to be normal, the monitoring protection device 40 controls the controllable switch 30 to be switched on, so that the power supply to the load 20 is realized.
The monitoring and protection device 40 according to the embodiment of the present invention is configured as shown in fig. 3, and includes a filtering and pulse protection module 100, a voltage detection module 200, a voltage comparison module 300, a driving module 400, and a power supply module 500 for supplying power to the aforementioned modules. The filter and pulse protection module 100 preferably filters and pulse protects the mains input voltageThe post-input voltage detection module 200 performs scaling, that is, performs step-down or step-up processing on the input voltage according to a certain ratio. In the embodiment of the present invention, the commercial power input voltage is 220V, and the maximum working voltage of the voltage comparison module 300 is 15V, so the input voltage needs to be stepped down to reach the normal range of the input voltage of the voltage comparison module 300. The input voltage after the proportion regulation is input into the voltage comparison module 300, and the voltage comparison module 300 stores the low-voltage action value threshold UminAnd a high pressure action value threshold UmaxWhen the input voltage is lower than UminOr higher than UmaxMeanwhile, the output level of the voltage comparison module 300 is inverted, and then the controllable switch 30 is controlled to be turned off by the driving module 400.
Setting U by considering the problem of the precision of voltage points of the action voltage threshold and the UPS-to-battery modemin=Ugrid-min-UThresholdAnd Umax=Ugrid-max+UThresholdWherein, Ugrid-minIs the lowest working voltage value, U, of the UPS commercial power modegrid-maxThe maximum working voltage value of the UPS commercial power mode is obtained. FIG. 4 shows U of an embodiment of the present inventiongrid-min、Ugrid-max、UminAnd UmaxThe relationship (2) of (c). U shapeThresholdIs the return difference voltage. In a UPS power supply system, return difference voltages commonly adopted by mains supply voltage, bypass voltage, battery voltage, temperature (resistance division value) and the like have unequal voltage difference values of 2-10V according to different system sampling accuracies. The back-differential voltage is set, mainly considering that the sampled voltage value has disturbance and may drift around a certain voltage value. For example, if the protection point of the mains voltage is set to 176V, at a certain time, the input mains voltage may be 176.2V, 175.8V, 176.3V, and 175.9V, which repeatedly oscillate, and may cause the UPS to repeatedly switch, resulting in frequent actions of the switching device of the UPS system and reduced lifetime of the UPS system. If the commercial power low-voltage protection point is 176V, and the voltage low-voltage recovery point is set to 180V, due to the existence of return difference voltage, the UPS can be effectively prevented from being switched repeatedly. The return difference voltage is mainly determined by the sampling precision and the conversion time of the system. In this embodiment, the back-differential voltage is stored in electricityAnd pressing the materials in the comparison module. In this case, the monitoring protection operation logic of the monitoring protection device 40 is as follows:
logic 1: when the input voltage U isgridLess than UminOr greater than UmaxWhen the UPS is switched to the battery mode, the monitoring and protection device 40 sends a signal to turn off the controllable switch 30;
logic 2: when the input voltage U isgridGreater than UminAnd is smaller than Ugrid-minOr mains voltage UgridLess than UmaxAnd is greater than Ugrid-maxWhen the UPS is switched to the battery mode, the monitoring and protection device 40 sends a signal to turn on the controllable switch 30;
logic 3: when the input voltage U isgridGreater than Ugrid-minAnd is smaller than Ugrid-maxWhen the monitoring and protecting device 40 sends a signal to turn on the controllable switch 30, the UPS returns to the commercial power mode.
In the above operation logic, the UPS of logic 1 and logic 2 are both operated in the battery mode, and table 1 below clearly shows the difference between logic 1 and logic 2.
TABLE 1
Logic 1 Logic 2
UPS mode of operation Battery mode Battery mode
UPS input side voltage Zero Low pressure
Controllable switch state Disconnect Conduction of
Feedback protection function Implementation of Does not need to use
In the logic 1, the controllable switch is disconnected, and when the UPS bypass fails, even if short-circuit current returns to the input end of the UPS, electrical overhaul personnel do not have electric shock risk; in above-mentioned logic 2, controllable switch switches on, and commercial power low pressure live input UPS, and electric overhaul personnel can be under construction according to normal operating rule, and the electric current of bypass fault feedback also can not make operating personnel electrocute.
According to other embodiments of the invention, the controllable switch 30 may be replaced by on-off means known in the art, such as a controllable module, a controllable relay, a controllable contactor, etc.
According to other embodiments of the present invention, the respective modules of the control and protection device 40 are powered by an externally provided power supply module.
The UPS system is provided with a special monitoring protection device for detecting the mains supply voltage to carry out fault protection, the circuit setting and the control software of the UPS are not required to be changed, the operation is simple, the cost is low, the stability and the reliability are higher, the electric isolation between the mains supply input and the UPS input is realized during the fault, the electrical overhaul personnel are safer, and the action is sensitive and the time delay is smaller because the electrical connection between the mains supply and the UPS is directly cut off during the fault.
Although the present invention has been described by way of preferred embodiments, the present invention is not limited to the embodiments described herein, and various changes and modifications may be made without departing from the scope of the present invention.

Claims (10)

1. The utility model provides a realize UPS system of feedback function, includes break-over device, UPS unit and control protection device, break-over device control commercial power input with electrical connection between the UPS unit, control protection device is used for surveying the voltage of commercial power and based on the commercial power voltage control that surveys break-over device switches on and breaks off.
2. The feedback enabled UPS system of claim 1 wherein the on-off device is a controllable switch, a controllable module, a controllable relay, or a controllable contactor.
3. The UPS system of claim 1, wherein the control protection device comprises a voltage detection module, a voltage comparison module and a driving module, the voltage detection module is configured to detect an input mains voltage and convert the input mains voltage into a voltage range suitable for the voltage comparison module, the voltage comparison module is configured to determine whether the mains voltage fails and transmit a corresponding signal to the driving module, and the driving module is configured to turn off or turn on the on/off device.
4. The UPS system of claim 3, wherein the voltage comparison module stores an action voltage threshold, and when the voltage input to the voltage comparison module exceeds the action voltage threshold, the voltage comparison module determines that the utility power is failed and transmits a fault signal to the driving module to enable the driving module to turn off the conduction breaking device.
5. The UPS system of claim 4 wherein the action voltage threshold comprises a low voltage action threshold and a high voltage action threshold, the voltage comparison module determines a utility fault and transmits a fault signal to the drive module to cause the drive module to disconnect the conduction disconnect device when the voltage input to the voltage comparison module is below the low voltage action threshold or above the high voltage action threshold, the UPS unit operating in battery mode.
6. A UPS system implementing a feedback function as claimed in claim 5 wherein the low voltage action threshold is lower than a voltage minimum for a mains operation mode of the UPS unit and the high voltage action threshold is higher than a voltage maximum for a mains operation mode of the UPS unit.
7. The UPS system of claim 6, wherein the drive module renders the conduction disconnect device conductive when the voltage input to the voltage comparison module is between the low voltage action threshold and a lowest voltage value of a mains operation mode of the UPS unit or between a highest voltage value of the mains operation mode of the UPS unit and the high voltage action threshold, the UPS operating in a battery mode.
8. The UPS system of claim 6, wherein the driving module turns on the conduction breaking device when the voltage input to the voltage comparison module is between a lowest voltage value and a highest voltage value of a mains operation mode of the UPS unit, and the UPS operates in the mains mode.
9. The UPS system of claim 3, wherein the control protection device further comprises a filtering and pulse protection module for filtering and pulse protecting the mains voltage before inputting the mains voltage to the voltage detection module.
10. The UPS system implementing a feedback function of claim 9, wherein the control protection device further comprises a power module for powering the filtering and pulse protection module, the voltage detection module, the voltage comparison module, and the driving module.
CN202010885870.7A 2020-08-28 2020-08-28 UPS system for realizing feedback function Pending CN111900794A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201590645U (en) * 2009-12-10 2010-09-22 厦门科华恒盛股份有限公司 AC input over-voltage and under-voltage protection device for electric apparatus
CN201829928U (en) * 2010-09-26 2011-05-11 深圳市斯恩泰电源有限公司 Main circuit backwards flowing protection device of uninterruptible power supply and uninterruptible power supply adopting same
CN102957132A (en) * 2012-11-23 2013-03-06 广东易事特电源股份有限公司 Uninterrupted power supply (UPS) battery low voltage discharge protection circuit with return difference
CN103001228A (en) * 2012-11-09 2013-03-27 广东易事特电源股份有限公司 Secondary power supply device and secondary power supply method for prolonging working time of primary load
CN108123538A (en) * 2016-11-29 2018-06-05 维谛技术有限公司 A kind of uninterruptible power supply UPS circuits are counter to fill guard method, device and UPS
CN110943529A (en) * 2019-12-04 2020-03-31 佛山职业技术学院 Mains supply switching circuit and method for interactive inverter
CN111327110A (en) * 2020-04-07 2020-06-23 中汽数据(天津)有限公司 Power control system and automatic driving vehicle

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201590645U (en) * 2009-12-10 2010-09-22 厦门科华恒盛股份有限公司 AC input over-voltage and under-voltage protection device for electric apparatus
CN201829928U (en) * 2010-09-26 2011-05-11 深圳市斯恩泰电源有限公司 Main circuit backwards flowing protection device of uninterruptible power supply and uninterruptible power supply adopting same
CN103001228A (en) * 2012-11-09 2013-03-27 广东易事特电源股份有限公司 Secondary power supply device and secondary power supply method for prolonging working time of primary load
CN102957132A (en) * 2012-11-23 2013-03-06 广东易事特电源股份有限公司 Uninterrupted power supply (UPS) battery low voltage discharge protection circuit with return difference
CN108123538A (en) * 2016-11-29 2018-06-05 维谛技术有限公司 A kind of uninterruptible power supply UPS circuits are counter to fill guard method, device and UPS
CN110943529A (en) * 2019-12-04 2020-03-31 佛山职业技术学院 Mains supply switching circuit and method for interactive inverter
CN111327110A (en) * 2020-04-07 2020-06-23 中汽数据(天津)有限公司 Power control system and automatic driving vehicle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
赵希峰等: "《关键信息基础设施故障技术手册 第一册:机房(站台)部分》", 电子科技大学, pages: 27 - 30 *

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