CN107677930A - A kind of UPS dc bus detection method of fuse state and device - Google Patents
A kind of UPS dc bus detection method of fuse state and device Download PDFInfo
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- CN107677930A CN107677930A CN201710832818.3A CN201710832818A CN107677930A CN 107677930 A CN107677930 A CN 107677930A CN 201710832818 A CN201710832818 A CN 201710832818A CN 107677930 A CN107677930 A CN 107677930A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/74—Testing of fuses
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Abstract
The invention discloses a kind of UPS dc bus detection method of fuse state and device, methods described to be：Collection is connected on the output voltage and output current of the inversion unit on UPS dc bus with fuse in real time, and calculates the instantaneous value of the output voltage and the instantaneous value of output current；Judge whether the instantaneous value of output voltage and the instantaneous value of output current are less than each self-corresponding setting value, if the instantaneous value of output voltage and the instantaneous value of output current are respectively less than each self-corresponding setting value, and the instantaneous value of output current is more than setting time less than the duration of setting value, then judges the fuse blows.The present invention can be quickly detected failure in fuse blows moment, without extra circuits and insulating power supply, will not take the I/O resource of main control chip.
Description
Technical field
The present invention relates to UPS fuse state detection techniques, are examined more particularly to a kind of UPS dc bus fuse state
Survey method and device.
Background technology
Uninterrupted power source (UPS) is to ensure power supply reliability visual plant, and much the occasion higher to power reguirements be all
Need to configure UPS, it is ensured that uninterrupted power supply is the most important functions of UPS；Ups power can be inverse by battery pack in city's electrical anomaly
Become output to power to load equipment, powered to the load in inverter exception by bypass output；Fuse is uninterrupted power source
(UPS) a kind of common protection device in system, it is therefore an objective to trouble point is disconnected using the characteristic of itself fusing under special circumstances,
It is unlikely to, because Single Point of Faliure, to cause whole system impacted.At present, a kind of conventional UPS topologys are on UPS dc bus
Serial fuse, as the protection device of inverter bridge, the state of detection fuse in real time is needed in the UPS courses of work, if molten
Disconnected device fuses, it would be desirable to be able to quickly determines, closes inversion and export and be quickly switched into bypass output, ensure system output not
Power down or power down are in allowed band.If do not detected to fuse state, after fuse blows, inverter bridge and straight
The connection for flowing bus disconnects, because lacking energy offer, inverter output voltage can quickly fall, and load is bigger, inversion output electricity
Pressure is fallen faster, so may result in output power down.
Currently used fuse detection mode is by detecting fuse both end voltage, is melted using fuse blows moment
There is pressure difference to detect in disconnected device both ends, and this method is more satisfactory fuse state detection mode；But this detection side
Formula needs special differential detection circuit and insulating power supply, at the same detect to signal need to be sent to master control core through light-coupled isolation
Piece I/O port, cost increase, circuit board space increase are not only related to, while take main control chip I/O resource.
The content of the invention
The invention provides a kind of UPS dc bus detection method of fuse state and device, prior art is which overcomed
UPS dc bus fuse state detection modes present in weak point.
The technical solution adopted for the present invention to solve the technical problems is：A kind of UPS dc bus fuse state detection
Method, collection is connected on the output voltage and output current of the inversion unit on UPS dc bus with fuse in real time, and calculates
The instantaneous value of the output voltage and the instantaneous value of output current；Judge the instantaneous value of output voltage and the instantaneous value of output current
Whether be less than each self-corresponding setting value, if the instantaneous value of output voltage and the instantaneous value of output current be respectively less than it is each self-corresponding
Setting value, and the instantaneous value of output current is more than setting time less than the duration of setting value, then judges that the fuse melts
It is disconnected.
Further, it is when judging the fuse blows, ups system is single for bypass by the inversion unit output switching
Member output.
Further, when judging the fuse blows, the alarm signal of fuse failure is sent.
Further, the inversion unit includes the inverter and transformer being connected in series, the output current structure of inverter
Into the output current, the output voltage of transformer secondary forms the output voltage.
Further, the output of the inversion unit connects load equipment with the output of by-pass unit by relay, sentences
During the fixed fuse blows, by controlling the relay power or power-off, make ups system by the inversion unit output switching
Exported for by-pass unit.
The present invention separately provides a kind of UPS dc bus fuse state detection means, including：
Sample detecting unit, the output current of the inversion unit on UPS dc bus is connected on fuse for gathering
And output voltage, and calculate the instantaneous value Iop of the output current and the instantaneous value Uop of output voltage；
Comparison judgment unit, for being made comparisons to the data of input and judging whether fuse fuses；
The input of the sample detecting unit is connected to the output end of the inversion unit, the output of the sample detecting unit
Comparison judgment unit is connected to, the instantaneous value Iop for the output current being calculated and output voltage instantaneous value Uop is defeated
Go out to comparison judgment unit.
Further, in addition to control unit and circuit switching mechanism, the output of the inversion unit and the side of ups system
The output of road unit connects load equipment by circuit switching mechanism, and the comparison judgment unit connects control unit, and control is single
Member connection circuit switching mechanism, when judging fuse blows, to make circuit switching mechanism by ups system by the inversion unit
Output switching exports for by-pass unit.
Further, in addition to Alarm Unit, described control unit connect the Alarm Unit, with fuse blows,
Control Alarm Unit sends the alarm signal of fuse failure；And/or the circuit switching mechanism is relay.
Further, the inversion unit includes the inverter and transformer being connected in series, the sample detecting unit bag
Include：
Current sampling unit, for gathering the output current of the inverter, and calculate the instantaneous value of the output current
Iop；
Voltage sampling unit, for gathering the output voltage of the transformer secondary, and calculate the wink of the output voltage
Duration Uop；
The output of the current sampling unit and voltage sampling unit is respectively connected to the comparison judgment unit.
Further, the comparison judgment unit includes：
Logic comparing unit, for the data to input compared with corresponding setting value；
Fuse judging unit, for judging whether fuse fuses；
The output of the sample detecting unit is connected to the input of logic comparing unit, and the output of logic comparing unit is connected to molten
Disconnected judging unit.
Compared to prior art, the invention has the advantages that：
1st, examined soon using inversion unit output voltage and output current, can be in fuse blows moment quick detection
To failure, without detecting fuse both end voltage, without extra circuits and insulating power supply, while main control chip will not be taken
I/O resource；
2nd, can in fuse blows, by ups system by the inversion unit output be switched fast for by-pass unit it is defeated
Go out, ensure system not power down, and alarm signal can be sent, help staff to know fuse state in time and change molten
Disconnected device.
The present invention is described in further detail below in conjunction with drawings and Examples；But a kind of UPS direct currents of the present invention are female
Line detection method of fuse state and device are not limited to embodiment.
Brief description of the drawings
Fig. 1 is the method flow schematic diagram of the present invention of embodiment one；
Fig. 2 is the theory diagram of the present invention of embodiment two.
Embodiment
Embodiment one
It is straight with fuse to be connected on UPS for a kind of UPS dc bus detection method of fuse state of the present invention, in real time collection
The output current and output voltage of the inversion unit on bus are flowed, and calculates the instantaneous value and output voltage of the output current
Instantaneous value；Judge whether the instantaneous value of output voltage and the instantaneous value of output current are less than each self-corresponding setting value, if output
The instantaneous value of voltage and the instantaneous value of output current are respectively less than each self-corresponding setting value, and the instantaneous value of output current is less than and set
The duration of definite value is more than setting time, then judges the fuse blows, and ups system is exported by the inversion unit
Switch to by-pass unit to export, send the alarm signal of fuse failure.
In the present embodiment, the inversion unit includes the inverter and transformer being connected in series, the output current of inverter
The output current is formed, the output voltage of transformer secondary forms the output voltage.
In the present embodiment, judge whether the instantaneous value of output voltage and the instantaneous value of output current are less than each self-corresponding set
During definite value, first judge whether the instantaneous value of output voltage is less than corresponding setting value (i.e. default magnitude of voltage), if so, then sentencing again
Whether the instantaneous value of disconnected output current is less than corresponding setting value (i.e. default current value).
In the present embodiment, the output of the inversion unit connects load equipment with the output of by-pass unit by relay,
That is, two static contacts of relay connect the output of inversion unit and the output of by-pass unit respectively, and the moving contact of relay connects
Connect load equipment.Before fuse blows, the static contact adhesive of the output end connection of the moving contact and inversion unit of relay,
When fuse blows, the relay power or power-off are controlled using control unit, make the moving contact and by-pass unit of relay
Output end connection static contact adhesive so that ups system by the inversion unit output switching be by-pass unit output.It is molten
During disconnected device fusing, and alarm signal is sent using described control unit control Alarm Unit.
Specifically, a kind of UPS dc bus detection method of fuse state of the invention, its overall method flow is referring to figure
Shown in 1, comprise the following steps：
S1, collection inverter output current and transformer secondary output voltage, calculate the instantaneous value Iop of the output current
With the instantaneous value Uop of output voltage；
S2, judge whether the instantaneous value Uop of the output voltage is less than default magnitude of voltage U1, if then performing step
S3, otherwise perform step S7；
S3, judge whether the instantaneous value Iop of the output current is less than default current value I1, if then performing step
S4, otherwise perform step S7；
S4, judge whether the duration t of the instantaneous value Iop of the output current less than default current value I1 is more than and set
Fixed time t1, if then performing step S5, otherwise return to step S1；
S5, judge bus fuse blows；
S6, control unit control relay switch to by-pass unit to export, and control unit control Alarm Unit sends alarm
Signal；
S7, end.
Embodiment two
A kind of UPS dc bus fuse state detection means shown in Figure 2, of the invention, including：
Sample detecting unit, for gathering the output electricity for the inversion unit being connected on fuse F1 on UPS dc bus
Stream and output voltage, and calculate the instantaneous value Iop of the output current and the instantaneous value Uop of output voltage；
Comparison judgment unit 6, for being made comparisons to the data of input and judging whether fuse F1 fuses；
The input of the sample detecting unit is connected to the output end of the inversion unit, the output of the sample detecting unit
Comparison judgment unit 6 is connected to, by the instantaneous value Iop for the output current being calculated and the instantaneous value Uop of output voltage
Export to comparison judgment unit 6.
In the present embodiment, present invention additionally comprises control unit 7 and circuit switching mechanism, the output of the inversion unit and
The output of the by-pass unit 3 of ups system connects load equipment, the connection of comparison judgment unit 6 control by circuit switching mechanism
Unit 7 processed, control unit 7 connect the circuit switching mechanism, when fuse F1 fuses, to make ups system by the inversion
Unit output switching is that by-pass unit 3 exports.Present invention additionally comprises Alarm Unit 8, described control unit 7 connects the Alarm Unit
8, so that when fuse F1 fuses, control Alarm Unit 8 sends the alarm signal of fuse F1 failures.The circuit switching mechanism
Specially relay K1.
In the present embodiment, the inversion unit includes the inverter 1 and transformer T1 being connected in series, the sample detecting list
Member includes：
Current sampling unit 4, for gathering the output current of the inverter 1, and calculate the instantaneous of the output current
Value Iop；
Voltage sampling unit 5, for gathering the output voltage of the transformer T1 secondary, and calculate the output voltage
Instantaneous value Uop；
The output of the current sampling unit 4 and voltage sampling unit 5 is respectively connected to the comparison judgment unit 6.
The comparison judgment unit 6 specifically includes：
Logic comparing unit, for the data to input compared with corresponding preset value；
Fuse judging unit, for judging whether fuse F1 fuses；
The output of the sample detecting unit is connected to the input of logic comparing unit, and the output of logic comparing unit is connected to molten
Disconnected judging unit.
The by-pass unit 3 and UPS dc bus are connected in parallel between civil power and load equipment, are also connected on UPS dc bus
Rectification unit 2 and filter capacitor C1 are connected to, the secondary of the transformer T1 is connected with filter capacitor C2.It is described during practical application
Current sampling unit 4 connects the output end of inverter 1, and voltage sampling unit 5 connects transformer T1 secondary output end.
Research has shown that UPS dc bus fuses F1 fuses, most direct phenomenon is exactly that inversion unit output voltage falls
Fall, but inversion unit output voltage, which falls, a variety of situations, such as impact load (iodine-tungsten lamp etc.) adds suddenly, exports wink
Between short circuit or sustained short-circuit etc. can all cause inverter output voltage to fall.Inversion output, which receives impact load, causes inversion defeated
Go out the reason for Voltage Drop is because of 1 current limliting of inverter, UPS control system detects that the output current of inverter 1 reaches current limliting
Point, in order to protect inverter 1, it is necessary to be blocked by the regulation of loop and to driving, so as to cause inverter output voltage to draw
Low, the Voltage Drop of this process is the progressive reduction of a cycle, while with the appearance of large impact electric current, reaches inversion
The design software or hardware current-limiting points of the system of device 1.Output short-circuit causes the output voltage of inverter 1 to fall also in that inversion limits
The reason for stream, but the direct performance of output short-circuit is exactly low-voltage, high-current, inverter output voltage is pulled low quickly, while inversion
The output current of device 1 reaches the design software or hardware current-limiting points of the system of inverter 1, different from impact process inverter voltage gradually
The reduction entered.It is because not having direct current in inverter bridge that dc bus fuse F1 fusing, which causes the output voltage of inverter 1 to fall,
Pressure, provided without energy, cause inverter output voltage to fall, if the load that output connects is bigger, inverter output voltage falls
Faster, its feature inverter output voltage is quickly to drag down, but electric current very little.
Therefore, the present invention is examined soon using inversion unit output voltage and output current, can be fused in fuse F1
Moment is quickly detected failure, and ups system is switched into bypass output, ensures system not power down.Also, the present invention does not increase additionally
Power up road and insulating power supply, the I/O resource that main control chip will not be taken；Simultaneously using existing inverter output voltage detection and
Inverter output current detection module carries out inversion unit output voltage and output current is examined soon, and overcome needed extra resource to go in the past
Detect the deficiency of fuse F1 both end voltages.
A kind of UPS dc bus fuse state detection means of the present invention, its course of work are as follows：
Current sampling unit 4 gathers the output current of inverter 1, and calculates the instantaneous value Iop of the output current, and voltage is adopted
Sample unit 5 gathers the output voltage of transformer T1 secondary, and calculates the instantaneous value Uop of the output voltage；
Current sampling unit 4 and voltage sampling unit 5 are respectively by the instantaneous value Iop for the output current being calculated, output
The instantaneous value Uop of voltage, which is exported, gives logic comparing unit, logic comparing unit first by the instantaneous value Uop of output voltage with it is default
Magnitude of voltage U1 is compared, if the instantaneous value Uop of output voltage is less than U1, further by the instantaneous value Iop of output current with
Default current value I1 is compared, if the instantaneous value Iop of output current is less than I1, comparative result is sent into fusing and judged
Unit, duration ts of the instantaneous value Iop less than default current value I1 of output current is calculated by fusing judging unit, and will
Duration t is compared with default time t1, if duration t is more than t1, judges bus fuse F1 fusing, and
Send commands to control unit 7, make the control relay K1 of control unit 7 by ups system by inversion unit output switching for bypass
Unit 3 exports, and controls Alarm Unit 8 to send the alarm signals of fuse F1 failures.
Above-described embodiment only be used for further illustrate the present invention a kind of UPS dc bus detection method of fuse state and
Device, but the invention is not limited in embodiment, every technical spirit according to the present invention are made any to above example
Simple modification, equivalent change and modification, each fall within the protection domain of technical solution of the present invention.
Claims (10)
- A kind of 1. UPS dc bus detection method of fuse state, it is characterised in that：Collection is connected on UPS with fuse in real time The output voltage and output current of inversion unit on dc bus, and calculate the instantaneous value and output current of the output voltage Instantaneous value；Judge whether the instantaneous value of output voltage and the instantaneous value of output current are less than each self-corresponding setting value, if defeated Go out the instantaneous value of voltage and the instantaneous value of output current is respectively less than each self-corresponding setting value, and the instantaneous value of output current is less than The duration of setting value is more than setting time, then judges the fuse blows.
- 2. UPS dc bus detection method of fuse state according to claim 1, it is characterised in that：Judge described molten During disconnected device fusing, ups system is exported by the inversion unit output switching for by-pass unit.
- 3. UPS dc bus detection method of fuse state according to claim 1 or 2, it is characterised in that：Described in judgement During fuse blows, the alarm signal of fuse failure is sent.
- 4. UPS dc bus detection method of fuse state according to claim 1, it is characterised in that：The inversion list Member includes the inverter and transformer being connected in series, and the output current of inverter forms the output current, transformer secondary Output voltage forms the output voltage.
- 5. UPS dc bus detection method of fuse state according to claim 2, it is characterised in that：The inversion list The output of member connects load equipment with the output of by-pass unit by relay, when judging the fuse blows, passes through control The relay power or power-off, ups system is set to be exported by the inversion unit output switching for by-pass unit.
- A kind of 6. UPS dc bus fuse state detection means, it is characterised in that：Including：Sample detecting unit, for gathering the output current of the inversion unit being connected on fuse on UPS dc bus and defeated Go out voltage, and calculate the instantaneous value Iop of the output current and the instantaneous value Uop of output voltage；Comparison judgment unit, for being made comparisons to the data of input and judging whether fuse fuses；The input of the sample detecting unit is connected to the output end of the inversion unit, and the output of the sample detecting unit is connected to Comparison judgment unit, by the instantaneous value Iop for the output current being calculated and output voltage instantaneous value Uop export to Comparison judgment unit.
- 7. UPS dc bus fuse state detection means according to claim 6, it is characterised in that：Also include control Unit and circuit switching mechanism, the output of the inversion unit and the output of the by-pass unit of ups system pass through circuit switching machine Structure connects load equipment, and the comparison judgment unit connects control unit, control unit connection circuit switching mechanism, to judge During fuse blows, circuit switching mechanism is set to export ups system for by-pass unit by the inversion unit output switching.
- 8. UPS dc bus fuse state detection means according to claim 7, it is characterised in that：Also include alarm Unit, described control unit connect the Alarm Unit, so that in fuse blows, control Alarm Unit sends fuse failure Alarm signal；And/or the circuit switching mechanism is relay.
- 9. UPS dc bus fuse state detection means according to claim 6, it is characterised in that：The inversion list Member includes the inverter and transformer being connected in series, and the sample detecting unit includes：Current sampling unit, for gathering the output current of the inverter, and calculate the instantaneous value Iop of the output current；Voltage sampling unit, for gathering the output voltage of the transformer secondary, and calculate the instantaneous value of the output voltage Uop；The output of the current sampling unit and voltage sampling unit is respectively connected to the comparison judgment unit.
- 10. UPS dc bus fuse state detection means according to claim 6, it is characterised in that：The comparison is sentenced Disconnected unit includes：Logic comparing unit, for the data to input compared with corresponding setting value；Fuse judging unit, for judging whether fuse fuses；The output of the sample detecting unit is connected to the input of logic comparing unit, and the output of logic comparing unit is connected to fusing and sentenced Disconnected unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710832818.3A CN107677930B (en) | 2017-09-15 | 2017-09-15 | UPS direct current bus fuse state detection method and device |
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|---|---|---|---|
| CN201710832818.3A CN107677930B (en) | 2017-09-15 | 2017-09-15 | UPS direct current bus fuse state detection method and device |
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| CN107677930B CN107677930B (en) | 2021-02-12 |
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| CN110395114A (en) * | 2019-07-25 | 2019-11-01 | 广州小鹏汽车科技有限公司 | A kind of the fuse monitoring method and device of vehicle |
| CN110797934A (en) * | 2019-10-10 | 2020-02-14 | 西安华为技术有限公司 | Monitoring battery fuse circuit and power supply system |
| CN110794226A (en) * | 2019-10-08 | 2020-02-14 | 云南电力技术有限责任公司 | Method and device for judging fused phase in three-phase three-column type distribution transformer |
| CN114128070A (en) * | 2019-07-17 | 2022-03-01 | 松下知识产权经营株式会社 | Power cut-off device |
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