CN207096418U - A kind of power failure detection circuit - Google Patents
A kind of power failure detection circuit Download PDFInfo
- Publication number
- CN207096418U CN207096418U CN201720926138.3U CN201720926138U CN207096418U CN 207096418 U CN207096418 U CN 207096418U CN 201720926138 U CN201720926138 U CN 201720926138U CN 207096418 U CN207096418 U CN 207096418U
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- Prior art keywords
- inverter
- circuit
- voltage
- detection circuit
- voltage value
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Abstract
The utility model discloses a kind of power failure detection circuit, by setting first voltage to detect circuit in inverter, and after inverter enters uncontrollable rectification state, the measured value of first voltage detection circuit output is made comparisons with theoretical value, if both deviations are larger, then illustrate that first voltage detection circuit certainly exists failure, so as to which alert notifies attendant to be repaired in time.So as to automatic decision detection circuit whether failure, have improve detection circuit applicability and improve power circuit security technique effect.
Description
Technical field
Electronic circuit technology field is the utility model is related to, more particularly to a kind of power failure detection circuit.
Background technology
In grid-connected photovoltaic system, in order to ensure that inverter is normally incorporated into the power networks, it is necessary to utilize the inspection in inverter
Slowdown monitoring circuit detects DC bus-bar voltage in real time i.e. whether charging voltage is normal.When the dc bus electricity that detection electric circuit inspection arrives
When pressing too high or too low, it will all cause inverter can not normally grid-connected progress.Such as：When detection circuit malfunctions cause to detect
When the DC bus-bar voltage arrived is less than actual value, inverter will be because of flase drop and automatically into holding state；Now, if can not be timely
It was found that detection fault, will cause inverter to be incorporated into the power networks for a long time.
It can be seen that in the prior art there is in grid-connected photovoltaic system if run into detection fault situation
When, it will cause system that flase drop occurs and make the inverter technical problem that can not be incorporated into the power networks for a long time.
Utility model content
The application provides a kind of power failure detection circuit, if to solve in the prior art there is run into detection
During the situation of fault, it will cause system that flase drop occurs and make the inverter technical problem that can not be incorporated into the power networks for a long time.
This application provides a kind of power failure detection circuit, including：
Charge power supply；
Charging circuit, it is connected with the charge power supply；
Inverter, including the first voltage detection circuit being connected with the charging circuit, the inverter and the charging
Power supply connects；
Rectifier-type relay, it is connected with the inverter；
Controller, it is connected with the charge power supply, the charging circuit, the inverter and the rectifier-type relay,
For after the inverter is in holding state, controlling the charging circuit to be charged for the charge power supply, and in institute
The storing electricity of charge power supply is stated more than or equal to after the first electricity, controls the rectifier-type relay adhesive so that the rectifier type
Relay is in uncontrollable rectification state, and the process to be charged for the charging circuit is in the charging circuit
In, the first voltage value on the circuit acquisition charging circuit is detected by the first voltage, and in the first voltage value
Difference between preset voltage value exports the first signal when being more than or equal to first threshold；
Failure alarm circuit, it is connected with the controller, is filled to be sent when obtaining first signal described in sign
The warning message of electric fault.
Alternatively, when the inverter is three-phase grid-connected inverter, the preset voltage value is power network phase voltage
2.21 it is worth again.
Alternatively, the inverter also includes：
Second voltage detects circuit, to detect the second voltage value of inverter place power network；
Tertiary voltage detects circuit, to detect the third voltage value on the inverter；
The controller, to obtain the second voltage value and the third voltage value, and in the second voltage value
Difference between the third voltage value sends secondary signal when being more than or equal to Second Threshold；
The failure alarm circuit, the second voltage detection circuit is characterized to be sent when obtaining the secondary signal
Or the warning message of fault where the inverter.
Alternatively, when the failure detector circuit includes being connected to the M inverters of power network through same transformer,
The controller, to obtain the magnitude of voltage on each inverter in the M inverters respectively, and will be described each
Maximum magnitude of voltage is as the third voltage value in magnitude of voltage on inverter.
Alternatively, the failure alarm circuit is wireless signal dispensing device, or the literary information display device of symbol.
The one or more technical schemes provided in the embodiment of the present application, have at least the following technical effects or advantages：
Technical scheme in the embodiment of the present application in inverter by setting first voltage to detect circuit, and in inverter
Into after uncontrollable rectification state, the measured value that first voltage is detected to circuit output is made comparisons with theoretical value, if both deviations
It is larger, then illustrate that first voltage detection circuit certainly exists failure, so as to which alert notifies attendant to carry out in time
Maintenance.So as to automatic decision detection circuit whether failure, have improve detection circuit applicability and improve power circuit peace
The technique effect of full property.
Brief description of the drawings
Fig. 1 is a kind of structure chart for power failure detection circuit that the utility model embodiment provides；
Fig. 2 is the structure chart of the inverter in a kind of power failure detection circuit that the utility model embodiment provides.
Embodiment
The application provides a kind of power failure detection circuit, if to solve in the prior art there is run into detection
During the situation of fault, it will cause system that flase drop occurs and make the inverter technical problem that can not be incorporated into the power networks for a long time.
Technical scheme in the embodiment of the present application is in order to solve the above technical problems, general thought is as follows：
Technical scheme in the embodiment of the present application in inverter by setting first voltage to detect circuit, and in inverter
Into after uncontrollable rectification state, the measured value that first voltage is detected to circuit output is made comparisons with theoretical value, if both deviations
It is larger, then illustrate that first voltage detection circuit certainly exists failure, so as to which alert notifies attendant to carry out in time
Maintenance.So as to automatic decision detection circuit whether failure, have improve detection circuit applicability and improve power circuit peace
The technique effect of full property.
Technical scheme is described in detail below by accompanying drawing and specific embodiment, it should be understood that the application
Specific features in embodiment and embodiment are the detailed description to technical scheme, rather than to present techniques
The restriction of scheme, in the case where not conflicting, the technical characteristic in the embodiment of the present application and embodiment can be mutually combined.
The terms "and/or", only a kind of incidence relation for describing affiliated partner, expression may have three kinds of passes
System, for example, A and/or B, can be represented：Individualism A, while A and B be present, these three situations of individualism B.In addition, herein
Middle character "/", it is a kind of relation of "or" to typically represent forward-backward correlation object.
Embodiment one
Fig. 1, Fig. 2 are refer to, the embodiment of the present application one provides a kind of power failure detection circuit, including：
Charge power supply 101；
Charging circuit 102, it is connected with the charge power supply；
Inverter 103, including the first voltage detection circuit 1031 being connected with the charging circuit, the inverter and institute
State charge power supply connection；
Rectifier-type relay 104, it is connected with the inverter；
Controller 105, connect with the charge power supply, the charging circuit, the inverter and the rectifier-type relay
Connect, for after the inverter is in holding state, controlling the charging circuit to be charged for the charge power supply, and
After the storing electricity of the charge power supply is more than or equal to the first electricity, the rectifier-type relay adhesive is controlled so that the rectification
Formula relay is in uncontrollable rectification state, and the process to be charged for the charging circuit is in the charging circuit
In, the first voltage value on the circuit acquisition charging circuit is detected by the first voltage, and in the first voltage value
Difference between preset voltage value exports the first signal when being more than or equal to first threshold；
Failure alarm circuit, it is connected with the controller, is filled to be sent when obtaining first signal described in sign
The warning message of electric fault.
In the failure detector circuit course of work of the embodiment of the present application, after AC relay closes, inverter enters
Uncontrollable rectification state, now power grid energy can through inverter internal can not control rectifying circuit be output on charging circuit, and
Before AC relay is closed, first have into line precharge, because：From the operation principle of capacitor, when capacitor is in parallel
When both ends of power, in power on moment, the voltage at capacitor both ends will not be mutated, but the electric current meeting at capacitor both ends
Mutation, therefore powered on moment capacitor is equivalent to short circuit；And had existing for electric capacity on the charging circuit of inverter, handed in closure
The moment of current relay, if no charging circuit enters line precharge, the diode that can not be in control rectifying circuit will be because straight
Flow the short circuit current of electric capacity moment on bus and damage, the electric capacity that charging circuit serves limitation power on moment herein fills
The effect of electric current.When inverter is operated in uncontrollable rectification state, draws energy from power network and rectification is output to charging circuit
Side, charging voltage is set to increase, the final stable state of charging voltage is relevant with current electric grid voltage.Therefore, can be according to current electric grid electricity
Pressure calculates the theoretical value for rising the charging voltage for reaching stable, if the measured value of first voltage detection circuit output is equal to the reason
By value, just explanation first voltage detects circuit fault-free, considers the presence of measurement error, and the present embodiment detects electricity with first voltage
The first voltage value and theoretical value of road output are that the difference of the preset voltage value is less than first threshold as judgement first voltage inspection
The trouble-free foundation of slowdown monitoring circuit.When inverter is three-phase grid-connected inverter, the preset voltage value=2.21*U, wherein, U is
Power network phase voltage virtual value.
By the present embodiment it can be seen from foregoing description after inverter enters uncontrollable rectification state, first voltage is examined
The measured value of slowdown monitoring circuit output is made comparisons with theoretical value, if both deviations are larger, illustrates that first voltage detection circuit certainly exists
Failure, it is necessary to be repaired in time.
It is pointed out that the inverter in the embodiment of the present application is three-phase grid-connected inverter, the preset voltage value is
2.21 times of values of power network phase voltage.Meanwhile the inverter also includes：
Second voltage detects circuit, to detect the second voltage value of inverter place power network；
Tertiary voltage detects circuit, to detect the third voltage value on the inverter；
The controller, to obtain the second voltage value and the third voltage value, and in the second voltage value
Difference between the third voltage value sends secondary signal when being more than or equal to Second Threshold；
The failure alarm circuit, the second voltage detection circuit is characterized to be sent when obtaining the secondary signal
Or the warning message of fault where the inverter.
Alternatively, the M inverters that power network is connected to through same transformer are also included in the failure detector circuit
When, the controller to obtain the magnitude of voltage on each inverter in the M inverters respectively, and will it is described often
Maximum magnitude of voltage is as the third voltage value in magnitude of voltage on individual inverter.
Still optionally further, the failure alarm circuit is wireless signal dispensing device, or the literary information display device of symbol.
As can be seen here, the technical scheme in the embodiment of the present application by inverter set first voltage detect circuit,
And after inverter enters uncontrollable rectification state, the measured value that first voltage is detected to circuit output is made comparisons with theoretical value,
If both deviations are larger, illustrate that first voltage detection circuit certainly exists failure, so as to which alert notice safeguards people
Member is repaired in time.So as to automatic decision detection circuit whether failure, have and improve detection circuit applicability and raising
The technique effect of power circuit security.
Although having been described for the preferred embodiment of the application, those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the application scope.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the application to the application
God and scope.Further, each method and step in technical scheme can overturn, and convert sequencing and still fall
Enter in the utility model scope that the application is covered.So, if these modifications and variations of the application belong to the application right
It is required that and its within the scope of equivalent technologies, then the application be also intended to comprising these change and modification including.
Claims (5)
- A kind of 1. power failure detection circuit, it is characterised in that including：Charge power supply；Charging circuit, it is connected with the charge power supply；Inverter, including the first voltage detection circuit being connected with the charging circuit, the inverter and the charge power supply Connection；Rectifier-type relay, it is connected with the inverter；Controller, it is connected, is used for the charge power supply, the charging circuit, the inverter and the rectifier-type relay After the inverter is in holding state, the charging circuit is controlled to be charged for the charge power supply, and filled described After the storing electricity of power supply is more than or equal to the first electricity, the rectifier-type relay adhesive is controlled so that the rectifier type relay Device is in uncontrollable rectification state, and during the charging circuit is in and charged for the charging circuit, leads to The first voltage value crossed on the first voltage detection circuit acquisition charging circuit, and in the first voltage value with presetting Difference between magnitude of voltage exports the first signal when being more than or equal to first threshold；Failure alarm circuit, it is connected with the controller, the charging electricity is characterized to be sent when obtaining first signal The warning message of road failure.
- 2. power failure detection circuit according to claim 1, it is characterised in that when the inverter is that three-phase grid is inverse When becoming device, the preset voltage value is 2.21 times of values of power network phase voltage.
- 3. failure detector circuit as claimed in claim 1, it is characterised in that the inverter also includes：Second voltage detects circuit, to detect the second voltage value of inverter place power network；Tertiary voltage detects circuit, to detect the third voltage value on the inverter；The controller, to obtain the second voltage value and the third voltage value, and in the second voltage value and institute State when the difference between third voltage value is more than or equal to Second Threshold and send secondary signal；The failure alarm circuit, the second voltage detection circuit or institute are characterized to be sent when obtaining the secondary signal The warning message of fault where stating inverter.
- 4. failure detector circuit as claimed in claim 3, it is characterised in that include in the failure detector circuit through same change When depressor is connected to the M inverters of power network, the controller, to obtain respectively in the M inverters Magnitude of voltage on each inverter, and using magnitude of voltage maximum in the magnitude of voltage on each inverter as the described 3rd electricity Pressure value.
- 5. the failure detector circuit as described in claim 1-4 any claims, it is characterised in that the failure alarm circuit For wireless signal dispensing device, or the literary information display device of symbol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720926138.3U CN207096418U (en) | 2017-07-27 | 2017-07-27 | A kind of power failure detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720926138.3U CN207096418U (en) | 2017-07-27 | 2017-07-27 | A kind of power failure detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207096418U true CN207096418U (en) | 2018-03-13 |
Family
ID=61546480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720926138.3U Expired - Fee Related CN207096418U (en) | 2017-07-27 | 2017-07-27 | A kind of power failure detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207096418U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188310A (en) * | 2018-11-07 | 2019-01-11 | 内蒙古电力(集团)有限责任公司乌海电业局 | The power module failure monitoring device and system and monitoring method of the electrical secondary system of switchgear |
| CN109375099A (en) * | 2018-10-19 | 2019-02-22 | 艾思玛新能源技术（扬中）有限公司 | A kind of fault detection method of photovoltaic inverter grid-connected relay |
-
2017
- 2017-07-27 CN CN201720926138.3U patent/CN207096418U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375099A (en) * | 2018-10-19 | 2019-02-22 | 艾思玛新能源技术（扬中）有限公司 | A kind of fault detection method of photovoltaic inverter grid-connected relay |
| CN109375099B (en) * | 2018-10-19 | 2020-10-02 | 爱士惟新能源技术(扬中)有限公司 | Fault detection method for grid-connected relay of photovoltaic inverter |
| CN109188310A (en) * | 2018-11-07 | 2019-01-11 | 内蒙古电力(集团)有限责任公司乌海电业局 | The power module failure monitoring device and system and monitoring method of the electrical secondary system of switchgear |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180313 Termination date: 20200727 |