CN102156243B - The detection method of a kind of state of power unit fuse and device - Google Patents
The detection method of a kind of state of power unit fuse and device Download PDFInfo
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- CN102156243B CN102156243B CN201110063481.7A CN201110063481A CN102156243B CN 102156243 B CN102156243 B CN 102156243B CN 201110063481 A CN201110063481 A CN 201110063481A CN 102156243 B CN102156243 B CN 102156243B
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- 238000001514 detection method Methods 0.000 title claims abstract description 52
- 230000000052 comparative effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 14
- 230000005611 electricity Effects 0.000 description 11
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
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Abstract
The detection method of the state of power unit fuse that the present invention provides and device, judge whether fuse fuses by the DC bus-bar voltage in detection power cell, because the immediate cause of fuse blows is exactly to occur overcurrent on fuse in power cell, and the generation of overcurrent causes due to short circuit, either outlet side short circuit or the rectification unit of power cell are short-circuit, or bus direct short-circuit, all can cause falling rapidly of DC bus-bar voltage.Therefore judge that the state of fuse is the most reliable by detection DC bus-bar voltage.And there is the device of detection DC bus-bar voltage in general power cell, therefore the method is both to fuse not requirement, it is not required that the voltage at detection fuse two ends, simple and reliable, low cost, and it is applicable to the occasion of medium and high pressure.
Description
Technical field
The present invention relates to power electronics detection technique field, particularly to a kind of state of power unit fuse
Detection method and device.
Background technology
In medium-pressure or high pressure cascade converter, all include the power cell of cascade, each power cell
Three-phase alternating current input be required for the protection of fuse.Fuse is to exceed setting a period of time according to electric current
After, make Melt molten with the heat that himself produces, so that circuit disconnects, use this principle to make
A kind of current protector.
Seeing Fig. 1, this figure is the topological diagram of current transformer power unit in prior art.
Three-phase alternating current input is respectively A phase, B phase and C phase, is all in series with fusing in A phase and C phase
Device.
Current transformer, in running, needs to detect the blown state of fuse.If fuse blows, then
The state reporting fused is to controller, and controller is defeated according to the Status Disable power cell of fuse
Go out, and demonstrated the fault message of fuse by human-computer interaction interface.
The most relatively common detection method of fuse state mainly has two kinds, and the first is by fuse certainly
Body with microswitch carry out state-detection；The second is to be detected by the voltage at detection fuse two ends
The state of fuse.
The most first introducing the first, see Fig. 2, this figure is to be examined by fuse microswitch in prior art
Survey the schematic diagram of fuse state.
Each fuse self is with microswitch.When, after fuse blows, the internal mechanism of fuse can make
Microswitch is gone off state from closure state or is become closure state from off-state, and testing circuit is examined
After measuring the state of microswitch, this state is uploaded to controller.Controller just can be by microswitch
Condition adjudgement goes out the state of fuse.
But, this method needs fuse to be especially tailored with microswitch.And during measurement circuit design
In order to prevent the high pressure at fuse to be incorporated into controller, need at high-pressure side and controller by optocoupler
Low-pressure side is isolated, this method relatively costly.
The second being described below, sees Fig. 3, this figure is by detecting the electricity at fuse two ends in prior art
The view of pressure detection fuse.
This method is that the voltage at detection fuse two ends judges, as it is shown on figure 3, the fuse in A phase
The voltage at two ends is that in V1, C phase, the voltage at fuse two ends is V2, testing circuit by detection V1 and
V2 is output switching signal after difference channel and comparison circuit (as shown in Figure 4), and switching signal is straight
Pick into controller.
But, the method there is problems of, and when fuse fuses suddenly, the two ends of fuse there will be electricity
Arc overvoltage is impacted, and so will result in testing circuit electric clearance excessive, and the most this method applies in general to
Low-voltage occasion is the highest and inapplicable due to voltage in medium-pressure or high pressure occasion.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of state of power unit fuse detection method and
Device, not only goes for low pressure occasion, could be applicable to the occasion of medium-pressure or high pressure, Er Qiecheng simultaneously
This is low.
The present invention provides the detection method of a kind of state of power unit fuse, including:
The DC bus-bar voltage of detection power cell；
The threshold value of described DC bus-bar voltage with setting is compared；
The state of fuse is judged, when described DC bus-bar voltage is less than the threshold of described setting according to comparative result
During value, it is judged that fuse blows, when described DC bus-bar voltage is more than or equal to the threshold value of described setting,
Judge that fuse is normal.
Preferably, also include: when judging fuse blows, forbid the output of power cell.
The present invention also provides for the detection device of a kind of state of power unit fuse, including:
DC bus-bar voltage detector unit, for detecting the DC bus-bar voltage of power cell；
Comparing unit, for comparing the threshold value of described DC bus-bar voltage with setting；
Judging unit, for judging the state of fuse, when described DC bus-bar voltage is little according to comparative result
When the threshold value of described setting, it is judged that fuse blows, when described DC bus-bar voltage is more than or equal to described
During the threshold value set, it is judged that fuse is normal.
Preferably, also include forbidding unit, when described judging unit judges fuse blows, be used for forbidding
The output of power cell.
Preferably, described DC bus-bar voltage detector unit includes difference subspace unit and voltage follow subelement；
The anode of DC bus-bar voltage and negative terminal connect positive input terminal and the negative input end of difference subspace unit respectively；
The outfan of difference subspace unit connects the input of voltage follow subelement；
The outfan of voltage follow subelement connects the input of comparing unit.
Preferably, described DC bus-bar voltage is the output voltage of the three phase rectifier unit in power cell, institute
Stating three phase rectifier unit is the uncontrollable rectification unit being constituted by a diode.
Preferably, described DC bus-bar voltage is the output voltage of the single-phase rectifier unit in power voltage, institute
Stating single-phase rectifier unit is the uncontrollable rectification unit being constituted by a diode.
Preferably, described DC bus-bar voltage is the output voltage of the three phase rectifier unit in power cell, institute
Stating three phase rectifier unit is the controlled rectification unit being made up of IGBT.
Preferably, described DC bus-bar voltage is the output voltage of the single-phase rectifier unit in power cell, institute
Stating single-phase rectifier unit is the controlled rectification unit being made up of IGBT.
Compared with prior art, the invention have the advantages that
The detection method of the state of power unit fuse that the present invention provides and device, by detection power cell
In DC bus-bar voltage judge whether fuse fuses, because fuse blows is direct in power cell
Reason is exactly to occur overcurrent on fuse, and the generation of overcurrent causes due to short circuit, either merit
The outlet side short circuit of rate unit or rectification unit short circuit, or bus direct short-circuit, all can cause direct current
Falling rapidly of busbar voltage.Therefore judge that the state of fuse very may be used by detection DC bus-bar voltage
Lean on.And there is the device of detection DC bus-bar voltage in general power cell, therefore the method was both
To fuse not requirement, it is not required that the voltage at detection fuse two ends, simple and reliable, low cost, and
And it is applicable to the occasion of medium and high pressure.
Accompanying drawing explanation
Fig. 1 is the topological diagram of power cell in prior art；
Fig. 2 is by the schematic diagram of fuse jogging switches measurement fuse state in prior art；
Fig. 3 is the view of the voltage detecting fuse in prior art by detection fuse two ends；
Fig. 4 is to be judged molten by the voltage at fuse two ends by difference channel and comparison circuit in prior art
The schematic diagram of disconnected device state；
Fig. 5 is the schematic diagram of the state of power unit fuse detection that the present invention provides；
Fig. 6 is the schematic diagram of the state of power unit fuse detection that the present invention provides；
Fig. 7 is detection device embodiment one structure chart of the state of power unit fuse that the present invention provides；
Fig. 8 is the schematic diagram of the DC bus-bar voltage detector unit that the present invention provides；
Fig. 9 is the schematic diagram that the device that the present invention provides is applied in the uncontrollable rectification unit of three-phase；
Figure 10 is the schematic diagram that the device that the present invention provides is applied in three-phase controlled rectification unit；
Figure 11 is the schematic diagram that the device that the present invention provides is applied in single-phase uncontrollable rectification unit；
Figure 12 is the schematic diagram that the device that the present invention provides is applied in single-phase controlled rectification unit.
Detailed description of the invention
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, the most right
The detailed description of the invention of the present invention is described in detail.
Seeing Fig. 5, this figure is the detection method of fuse state embodiment one of the power cell that the present invention provides
Flow chart.
The detection method of the state of power unit fuse that the present embodiment provides, including:
S501: the DC bus-bar voltage of detection power cell；
It is understood that power cell generally refers to the rectification unit in converter or current transformer and inversion list
The combination of unit.Wherein DC bus-bar voltage refers to the output voltage of rectification unit, and rectification unit can be single
Commutating phase unit can also be three phase rectifier unit, and every kind of rectification unit can be that diode forms not
Controlled rectification unit, it is also possible to for the controlled rectification unit being made up of IGBT.
S502: the threshold value of described DC bus-bar voltage with setting is compared；
S503: judge the state of fuse according to comparative result, be less than when described DC bus-bar voltage described in set
During fixed threshold value, it is judged that fuse blows, when described DC bus-bar voltage is more than or equal to the threshold of described setting
During value, it is judged that fuse is normal.
When occurring overcurrent in power cell, all of fuse all can fuse, thus disconnects exchange input
And power cell, it is achieved protective effect.
As shown in Figure 6, this figure is the schematic diagram of the state of power unit fuse detection that the present invention provides.
Vbus represents that DC bus-bar voltage, BUS+ represent the anode of DC bus-bar voltage, and BUS-represents straight
The negative terminal of stream busbar voltage.
When power cell powers on, in order to avoid detecting the state of fuse mistakenly, need to arrange certain prolonging
Late the time, such as, time delay 5s is set, after power cell powers on 5s, just starts to detect DC bus-bar voltage.
Under power cell during electricity, owing to DC bus-bar voltage is before dropping to the threshold value of setting, controller stop over
Only work, thus flase drop when avoiding lower electricity, therefore under power cell during electricity, it is not necessary to arrange delay.
When power cell normally works, when, after fuse blows, DC bus-bar voltage will fall rapidly upon, even if declining
To zero, controller also can work always, such that it is able to be correctly detecting the state of fuse.
The detection method of state of power unit fuse that the present invention provides, straight by detection power cell
Stream busbar voltage judges whether fuse fuses, because the immediate cause of fuse blows is just in power cell
It is that overcurrent occurs on fuse, and the generation of overcurrent causes due to short circuit, either power cell
Outlet side short circuit or rectification unit short circuit, or bus direct short-circuit, all can cause dc bus electricity
Falling rapidly of pressure.Therefore judge that the state of fuse is the most reliable by detection DC bus-bar voltage.And
And general power cell has existed the device detecting DC bus-bar voltage, therefore the method is both to fusing
Device not requirement, it is not required that the voltage at detection fuse two ends, simple and reliable, low cost, and be suitable for
Occasion in medium and high pressure.
The method that the present invention provides also includes when judging fuse blows, forbids the output of power cell.
The detection method of a kind of state of power unit fuse based on above-mentioned offer, present invention also offers one
Plant the detection device of state of power unit fuse, describe its composition portion in detail below in conjunction with specific embodiment
Point.
Seeing Fig. 7, this figure is the detection device embodiment one of the state of power unit fuse that the present invention provides
Structure chart.
The detection device of the state of power unit fuse that the present embodiment provides, including:
DC bus-bar voltage detector unit 701, for detecting the DC bus-bar voltage of power cell；
It is understood that power cell generally refers to the rectification unit in converter or current transformer and inversion list
The combination of unit.Wherein DC bus-bar voltage refers to the output voltage of rectification unit, and rectification unit can be single
Commutating phase unit can also be three phase rectifier unit, and every kind of rectification unit can be that diode forms not
Controlled rectification unit, it is also possible to for the controlled rectification unit being made up of IGBT.
Comparing unit 702, for comparing the threshold value of described DC bus-bar voltage with setting；
Judging unit 703, for judging the state of fuse, when described dc bus electricity according to comparative result
When pressure is less than the threshold value of described setting, it is judged that fuse blows, when described DC bus-bar voltage is more than or equal to
During the threshold value of described setting, it is judged that fuse is normal.
When occurring overcurrent in power cell, all of fuse all can fuse, thus disconnects exchange input
And power cell, it is achieved protective effect.
The detection device of state of power unit fuse that the present invention provides, straight by detection power cell
Stream busbar voltage judges whether fuse fuses, because the immediate cause of fuse blows is just in power cell
It is that overcurrent occurs on fuse, and the generation of overcurrent causes due to short circuit, either power cell
Outlet side short circuit or rectification unit short circuit, or bus direct short-circuit, all can cause dc bus electricity
Falling rapidly of pressure.Therefore judge that the state of fuse is the most reliable by detection DC bus-bar voltage.And
And general power cell has existed the device detecting DC bus-bar voltage, therefore the method is both to fusing
Device not requirement, it is not required that the voltage at detection fuse two ends, simple and reliable, low cost, and be suitable for
Occasion in medium and high pressure.
When power cell powers on, in order to avoid detecting the state of fuse mistakenly, need to arrange certain prolonging
Late the time, such as, time delay 5s is set, after power cell powers on 5s, DC bus-bar voltage detector unit 701
Just start to detect DC bus-bar voltage.Under power cell during electricity, owing to DC bus-bar voltage is dropping to setting
Threshold value before, controller has quit work, thus avoid lower electricity time flase drop, therefore power cell
During lower electricity, it is not necessary to delay is set.When power cell normally works, when after fuse blows, dc bus
Voltage will fall rapidly upon, even if dropping to zero, controller also can work always, such that it is able to be correctly detecting
The state of fuse.
The detection device of the state of power unit fuse that the present invention provides, also includes forbidding unit, when described
When judging unit judges fuse blows, for forbidding the output of power cell.
Introduce the specific implementation of the detection device that the present invention provides below in conjunction with the accompanying drawings.
Seeing Fig. 8, this figure is the schematic diagram of the DC bus-bar voltage detector unit that the present invention provides.
Described DC bus-bar voltage detector unit includes difference subspace unit 801 and voltage follow subelement 802；
The anode BUS+ and negative terminal BUS-of DC bus-bar voltage connect the most defeated of difference subspace unit 801 respectively
Enter end and negative input end；
The outfan of difference subspace unit 801 connects the input of voltage follow subelement 802；May be appreciated
It is that difference subspace unit 801 can utilize difference channel to realize.
The outfan V-Bus of voltage follow subelement 802 connects the input of comparing unit.
Higher DC bus-bar voltage is sampled by difference subspace unit 801 by difference channel, and is converted to
Being available for low-voltage signal amplitude limit that controller uses, difference channel also acts the work of high-pressure and low-pressure isolation simultaneously
With.Voltage follow subelement 802 is the characteristic utilizing voltage follower, improves for preamplifying circuit
Input impedance, the sample circuit for rear class controller reduces output impedance, serves form a connecting link slow
Punching effect.Voltage follow subelement 802 can utilize voltage follower to realize.
Wherein DC bus-bar voltage refers to the output voltage of rectification unit, and rectification unit can be single-phase rectifier
Unit can also be three phase rectifier unit, and every kind of rectification unit can be the uncontrollable whole of diode composition
Stream unit, it is also possible to for the controlled rectification unit being made up of IGBT.This is discussed in detail below in conjunction with the accompanying drawings several
The application of the situation of kind.
Seeing Fig. 9, this figure is that the device that the present invention provides is applied to the signal in the uncontrollable rectification unit of three-phase
Figure.
Described DC bus-bar voltage Vbus is the output voltage of the three phase rectifier unit 900 in power cell,
Described three phase rectifier unit 900 is the uncontrollable rectification unit being constituted by a diode.
Seeing Figure 10, this figure is that the device that the present invention provides is applied to the signal in three-phase controlled rectification unit
Figure.
Described DC bus-bar voltage Vbus is the output voltage of the three phase rectifier unit 1000 in power cell,
Described three phase rectifier unit 1000 is the controlled rectification unit being made up of IGBT.
Seeing Figure 11, this figure is that the device that the present invention provides is applied to showing in single-phase uncontrollable rectification unit
It is intended to.
Described DC bus-bar voltage Vbus is the output voltage of the single-phase rectifier unit 1100 in power cell,
Described single-phase rectifier unit 1100 is the uncontrollable rectification unit being constituted by a diode.
Seeing Figure 12, this figure is that the device that the present invention provides is applied to the signal in single-phase controlled rectification unit
Figure.
Described DC bus-bar voltage Vbus is the output voltage of the single-phase rectifier unit 1200 in power cell,
Described single-phase rectifier unit 1200 is the controlled rectification unit being made up of IGBT.
The above, be only presently preferred embodiments of the present invention, not makees the present invention any pro forma
Limit.Although the present invention is disclosed above with preferred embodiment, but it is not limited to the present invention.Any
Those of ordinary skill in the art, without departing under technical solution of the present invention ambit, may utilize above-mentioned
Technical solution of the present invention is made many possible variations and modification, or amendment by the method disclosed and technology contents
Equivalent embodiments for equivalent variations.Therefore, every content without departing from technical solution of the present invention, according to this
The technical spirit of invention, to any simple modification made for any of the above embodiments, equivalent variations and modification, the most still belongs to
In the range of technical solution of the present invention is protected.
Claims (6)
1. the detection device of a state of power unit fuse, it is characterised in that including:
DC bus-bar voltage detector unit, for detecting the DC bus-bar voltage of power cell；
Comparing unit, for comparing the threshold value of described DC bus-bar voltage with setting；
Judging unit, for judging the state of fuse, when described DC bus-bar voltage is little according to comparative result
When the threshold value of described setting, it is judged that fuse blows, when described DC bus-bar voltage is more than or equal to described
During the threshold value set, it is judged that fuse is normal；
Described DC bus-bar voltage detector unit includes difference subspace unit and voltage follow subelement；
The anode of DC bus-bar voltage and negative terminal connect positive input terminal and the negative input end of difference subspace unit respectively；
The outfan of described difference subspace unit connects the input of voltage follow subelement；
The outfan of described voltage follow subelement connects the input of comparing unit；
Described DC bus-bar voltage is sampled by described difference subspace unit by difference channel, and be converted to can
Low-voltage signal amplitude limit for controller；Described controller includes described comparing unit and judging unit；
Described voltage follow subelement improves input impedance for preamplifying circuit, adopts for controller
Sample circuit reduces output impedance.
The detection device of state of power unit fuse the most according to claim 1, it is characterised in that
Also include forbidding unit, when described judging unit judges fuse blows, for forbidding the defeated of power cell
Go out.
3. according to the detection device of the state of power unit fuse described in any one of claim 1-2, its
Being characterised by, described DC bus-bar voltage is the output voltage of the three phase rectifier unit in power cell, described
Three phase rectifier unit is the uncontrollable rectification unit being constituted by a diode.
4. according to the detection device of the state of power unit fuse described in any one of claim 1-2, its
Being characterised by, described DC bus-bar voltage is the output voltage of the single-phase rectifier unit in power cell, described
Single-phase rectifier unit is the uncontrollable rectification unit being constituted by a diode.
5. according to the detection device of the state of power unit fuse described in any one of claim 1-2, its
Being characterised by, described DC bus-bar voltage is the output voltage of the three phase rectifier unit in power cell, described
Three phase rectifier unit is the controlled rectification unit being made up of IGBT.
6. according to the detection device of the state of power unit fuse described in any one of claim 1-2, its
Being characterised by, described DC bus-bar voltage is the output voltage of the single-phase rectifier unit in power cell, described
Single-phase rectifier unit is the controlled rectification unit being made up of IGBT.
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| CN201110063481.7A CN102156243B (en) | 2011-03-16 | 2011-03-16 | The detection method of a kind of state of power unit fuse and device |
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| CN201110063481.7A CN102156243B (en) | 2011-03-16 | 2011-03-16 | The detection method of a kind of state of power unit fuse and device |
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| CN102156243B true CN102156243B (en) | 2016-08-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103245872B (en) * | 2013-05-22 | 2015-09-30 | 湘潭电机股份有限公司 | AC fuse condition checkout gear |
| US10598703B2 (en) * | 2015-07-20 | 2020-03-24 | Eaton Intelligent Power Limited | Electric fuse current sensing systems and monitoring methods |
| CN106066004A (en) * | 2016-05-31 | 2016-11-02 | 鸿利智汇集团股份有限公司 | A kind of AC LED manufacture method |
| US10103665B2 (en) * | 2017-01-06 | 2018-10-16 | General Electric Company | Protection for redundancy of isolated inverter blocks |
| CN107247213B (en) * | 2017-06-27 | 2020-04-10 | 株洲中车时代电气股份有限公司 | Distributed power supply fuse state detection method and device of photovoltaic power generation system |
| CN107677930B (en) * | 2017-09-15 | 2021-02-12 | 漳州科华技术有限责任公司 | UPS direct current bus fuse state detection method and device |
| CN108267665B (en) | 2017-11-22 | 2020-10-02 | 珠海格力电器股份有限公司 | Bus short circuit detection method, circuit, storage medium and processor |
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| JP2005302683A (en) * | 2004-04-14 | 2005-10-27 | Mitsutaka Kajino | Fuse inspecting device |
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Address after: Nanshan District Xueyuan Road in Shenzhen city of Guangdong province 518055 No. 1001 Nanshan Chi Park B2 building 1-4 floor, building 6-10 Patentee after: VERTIV TECH Co.,Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: EMERSON NETWORK POWER Co.,Ltd. |
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Effective date of registration: 20220121 Address after: 712000 room 804, 8th floor, building 14, West Yungu phase I, Fengxi new town, Xixian new area, Xi'an, Shaanxi Patentee after: Weidi new energy Co.,Ltd. Address before: 518055 1-4, 6-10 floor, B2 building, Nanshan Zhiyuan, 1001 Nanshan District Xue Yuan Avenue, Shenzhen, Guangdong. Patentee before: VERTIV TECH Co.,Ltd. |
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Effective date of registration: 20240110 Address after: Building B2, Nanshan Zhiyuan, No. 1001 Daoxueyuan Avenue, Nanshan District, Shenzhen, Guangdong Province, 518000 Patentee after: VERTIV TECH Co.,Ltd. Address before: 712000 room 804, 8th floor, building 14, West Yungu phase I, Fengxi new town, Xixian new area, Xi'an, Shaanxi Patentee before: Weidi new energy Co.,Ltd. |