CN209250214U - A kind of emergency protection circuit device for electric and system of over-voltage - Google Patents
A kind of emergency protection circuit device for electric and system of over-voltage Download PDFInfo
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- CN209250214U CN209250214U CN201822045690.9U CN201822045690U CN209250214U CN 209250214 U CN209250214 U CN 209250214U CN 201822045690 U CN201822045690 U CN 201822045690U CN 209250214 U CN209250214 U CN 209250214U
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- 238000007493 shaping process Methods 0.000 claims abstract description 51
- 230000001052 transient effect Effects 0.000 claims abstract description 48
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- 230000005611 electricity Effects 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 5
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Abstract
The utility model provides the emergency protection circuit device for electric and system of a kind of over-voltage, comprising: voltage sensor acquires the voltage signal of electric system, and voltage signal is transmitted to plastic filter circuit；Plastic filter circuit carries out shaping filter processing to voltage signal, and the voltage signal after shaping filter is transmitted separately to transient protection circuit and inverse time-lag protection；Transient protection circuit and inverse time-lag protection pass through or door and circuit connection to be protected; voltage signal after transient protection circuit detects shaping filter meets the first outage condition; or voltage signal after inverse time-lag protection detects shaping filter meets the second outage condition; by or door export power-off signal, to cut off circuit to be protected.The device not only allows for Overvoltage Amplitude at work, it is also contemplated that overvoltage is held time, and safer, high reliablity, the multisection type protected mode safety for alleviating existing emergency protection circuit device for electric is poor, the low problem of reliability.
Description
Technical field
The utility model relates to the technical fields of emergency protection circuit device for electric, more particularly, to a kind of the tight of over-voltage
Anxious protection circuit device and system.
Background technique
In the power system, the presence of overvoltage will affect the safe operation of working equipment in electric system.Specifically, mistake
Voltage is divided into transient overvoltage and transient overvoltage, and it is that one kind has that the duration of transient overvoltage, which is several milliseconds or shorter,
The oscillation of heavy damping or the overvoltage of non-oscillatory；Transient overvoltage refers to that the high voltage pulse quickly to jump is added to supply voltage
Voltage caused by upper increases, it is a kind of slower overvoltage that decays in duration ranges.
In order to ensure the safe operation of electric system, emergency protection circuit device for electric is usually set in the power system.Promptly
Circuit device is protected to have arrester to prevent transient overvoltage.Since the transient overvoltage duration is longer, protected using classification
The mode of shield is to reduce the shutdown of working equipment.Currently, cascade protection mostly uses multisection type guard method, that is, use different pressure resistances
The protection element of grade is protected.For example, the route (including A route, B route and C route) in electric system is divided into three
A stress levels, wherein the stress levels of A route are 230V, and the stress levels of B route are 240V, and the stress levels of C route are
250V, that is, if the voltage on A route is more than 230V after, A route is cut off, if cut after the voltage of B route is more than 240V
Disconnected B route, if the voltage of C route is more than cutting C route after 250V.This multisection type guard method only only accounts for voltage
Amplitude, the duration without considering voltage, (such as 228V does not cut away any route), system if overvoltage level is lower
The overvoltage that may bear the long period, be easy to cause safety accident；If simultaneously transient voltage it is very big, but the duration compared with
It is short, electric system may be endangered less, carry out protecting easy expansion accident range.
To sum up, the multisection type protected mode safety of existing emergency protection circuit device for electric is poor, and reliability is low.
Summary of the invention
In view of this, the purpose of this utility model is to provide a kind of emergency protection circuit device for electric of over-voltage, with
The multisection type protected mode safety for alleviating existing emergency protection circuit device for electric is poor, the low technical problem of reliability.
In a first aspect, the utility model embodiment provides a kind of emergency protection circuit device for electric of over-voltage, it is described
Device includes: voltage sensor, plastic filter circuit, transient protection circuit and inverse time-lag protection；
The voltage sensor and the transmission line of electric system connect, and the voltage for acquiring the electric system is believed
Number, and the voltage signal is transmitted to the input terminal of the plastic filter circuit；
The output end of the plastic filter circuit connects with the transient protection circuit, the inverse time-lag protection respectively
It connects, the voltage signal that the plastic filter circuit is used to acquire the voltage sensor carries out shaping filter processing, will
Voltage signal after shaping filter is transmitted separately to the transient protection circuit and the inverse time-lag protection；
The transient protection circuit and the inverse time-lag protection pass through or door and circuit connection to be protected, wherein when
When the transient protection circuit detects that the voltage signal after the shaping filter meets the first outage condition, or work as the inverse time
When limiting voltage signal the second outage condition of satisfaction after protection circuit detects the shaping filter, exported by described or door disconnected
Electric signal, to cut off the circuit to be protected.
With reference to first aspect, the utility model embodiment provides the first possible embodiment of first aspect,
In, the plastic filter circuit includes: shaping circuit and filter circuit.
With reference to first aspect, the utility model embodiment provides second of possible embodiment of first aspect,
In, the transient protection circuit includes: first comparator；
The positive input of the first comparator is connect with the filter circuit, the reversed input of the first comparator
The first reference voltage of end connection, the output end of the first comparator are connect with described or door input terminal, wherein described first
Outage condition is that the voltage signal after the shaping filter is greater than first reference voltage.
With reference to first aspect, the utility model embodiment provides the third possible embodiment of first aspect,
In, the inverse time-lag protection includes: voltage follower, subtracter, integrator and the second comparator；
The input terminal of the voltage follower is connect with the filter circuit, the output end of the voltage follower with it is described
The reverse input end of subtracter connects；
The positive input of the subtracter is connect with normal voltage, and the output end of the subtracter and the integrator connect
It connects, voltage difference of the subtracter for voltage signal and the normal voltage after obtaining the shaping filter, and will be described
Voltage difference is transmitted to the integrator；
The output end of the integrator is connect with the positive input of second comparator, and the integrator is used for institute
It states voltage difference to be integrated, and by the voltage transmission after integral to the positive input of second comparator；
The reverse input end of second comparator connects the second reference voltage, the output end of second comparator and institute
It states or the input terminal of door connects, wherein second outage condition is that the voltage after the integral is greater than described second with reference to electricity
Pressure.
With reference to first aspect, the utility model embodiment provides the 4th kind of possible embodiment of first aspect,
In, first reference voltage is greater than second reference voltage.
With reference to first aspect, the utility model embodiment provides the 5th kind of possible embodiment of first aspect,
In, the integral coefficient of the integrator is adjustable.
With reference to first aspect, the utility model embodiment provides the 6th kind of possible embodiment of first aspect,
In, described device further include: shell；
The voltage sensor, the plastic filter circuit, the transient protection circuit and the inverse time-lag protection
It is set in the shell, wherein the shell is for protecting the voltage sensor, the plastic filter circuit, the wink
State protects circuit and the inverse time-lag protection.
With reference to first aspect, the utility model embodiment provides the 7th kind of possible embodiment of first aspect,
In, described device further include: alarm；
The surface of the alarm setting and the shell, and the alarm is connect with described or door output end,
In, when described or door output power-off signal, the alarm is alarmed.
With reference to first aspect, the utility model embodiment provides the 8th kind of possible embodiment of first aspect,
In, the alarm is combined aural and visual alarm.
Second aspect, the utility model embodiment additionally provide a kind of emergency protective circuit system of over-voltage, institute
The system of stating includes the emergency protection circuit device for electric of over-voltage described in above-mentioned first aspect, further includes electric system；
Wherein, the emergency protection circuit device for electric of the over-voltage is installed in the electric system.
The utility model embodiment brings following the utility model has the advantages that the utility model embodiment provides and a kind of limited electricity
The emergency protection circuit device for electric and system of pressure, the device include: voltage sensor, plastic filter circuit, transient protection circuit and
Inverse time-lag protection；Voltage sensor and the transmission line of electric system connect, for acquiring the voltage signal of electric system,
And voltage signal is transmitted to the input terminal of plastic filter circuit；The output end of plastic filter circuit is electric with transient protective respectively
Road, inverse time-lag protection connection, the voltage signal that plastic filter circuit is used to acquire voltage sensor carry out shaping filter
Processing, is transmitted separately to transient protection circuit and inverse time-lag protection for the voltage signal after shaping filter；Transient protective electricity
Road and inverse time-lag protection pass through or door and circuit connection to be protected, wherein when transient protection circuit detects shaping filter
Voltage signal when voltage signal afterwards meets the first outage condition, or after inverse time-lag protection detects shaping filter is full
Foot the second outage condition when, by or door export power-off signal, to cut off circuit to be protected.
In the prior art, emergency protection circuit device for electric uses the protected mode of multisection type, and safety is poor, and reliability is low.With
The emergency protection circuit device for electric of existing over-voltage is compared, the urgent guarantor of the over-voltage in the utility model embodiment
Protection circuit device first passes through the voltage signal of voltage sensor acquisition electric system, is then believed by plastic filter circuit voltage
Number carry out shaping filter processing, by the voltage signal after shaping filter be transmitted separately to transient protection circuit and inverse time-lag protection electricity
Road, and then if transient protection circuit detects that the voltage signal after shaping filter meets the first outage condition or inverse time-lag protection
When circuit detects that the voltage signal after shaping filter meets the second outage condition, by or door export power-off signal, with cutting
Circuit to be protected.In device in the utility model, if on the one hand the voltage signal after shaping filter reaches first with reference to electricity
When pressing (meeting the first outage condition), power-off signal, insantaneous break circuit to be protected can be exported by transient protection circuit；
On the other hand, if the voltage signal after shaping filter is not very big, but long enough is held time, overvoltage accumulation reaches the
When two reference voltages (meeting the second outage condition), power-off signal, delay cutoff can be exported by inverse time-lag protection
Circuit to be protected, the device not only allow for Overvoltage Amplitude at work, it is also contemplated that and overvoltage is held time, in use,
Safer, high reliablity, the multisection type protected mode safety for alleviating existing emergency protection circuit device for electric is poor, reliability
Low problem.
Other feature and advantage of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood and implementing the utility model.The purpose of this utility model and other advantages are illustrating
Specifically noted structure is achieved and obtained in book, claims and attached drawing.
To enable the above objects, features, and advantages of the utility model to be clearer and more comprehensible, preferred embodiment is cited below particularly, and
Cooperate appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structural frames of the emergency protection circuit device for electric of over-voltage provided by the embodiment of the utility model
Figure；
Fig. 2 is the structural frames of the emergency protection circuit device for electric of another over-voltage provided by the embodiment of the utility model
Figure；
Fig. 3 is the circuit diagram of the emergency protection circuit device for electric of over-voltage provided by the embodiment of the utility model；
Fig. 4 is the structural frames of the emergency protection circuit device for electric of preferably over-voltage provided by the embodiment of the utility model
Figure.
Icon:
11- voltage sensor；12- plastic filter circuit；13- transient protection circuit；14- inverse time-lag protection；15- or
Door；16- alarm；121- shaping circuit；122- filter circuit；131- first comparator；141- voltage follower；142- subtraction
Device；143- integrator；The second comparator of 144-.
Specific embodiment
To keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, below in conjunction with attached drawing to this
The technical solution of utility model is clearly and completely described, it is clear that described embodiment is that the utility model a part is real
Example is applied, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making
Every other embodiment obtained, fall within the protection scope of the utility model under the premise of creative work.
For convenient for understanding the present embodiment, first to a kind of over-voltage disclosed in the utility model embodiment
Emergency protection circuit device for electric describe in detail.
Embodiment one:
A kind of emergency protection circuit device for electric of over-voltage, with reference to Fig. 1, which includes: voltage sensor 11, shaping
Filter circuit 12, transient protection circuit 13 and inverse time-lag protection 14；
Voltage sensor 11 is connect with the transmission line of electric system, for acquiring the voltage signal of electric system, and will
Voltage signal is transmitted to the input terminal of plastic filter circuit 12；
The output end of plastic filter circuit 12 is connect with transient protection circuit 13, inverse time-lag protection 14 respectively, shaping
The voltage signal that filter circuit 12 is used to acquire voltage sensor 11 carries out shaping filter processing, by the voltage after shaping filter
Signal is transmitted separately to transient protection circuit 13 and inverse time-lag protection 14；
Transient protection circuit 13 and inverse time-lag protection 14 pass through or door 15 and circuit connection to be protected, wherein works as wink
When state protection circuit 13 detects that the voltage signal after shaping filter meets the first outage condition, or work as inverse time-lag protection 14
When voltage signal after detecting shaping filter meets the second outage condition, by or door 15 export power-off signal, with cutting to
Protect circuit.
In the utility model embodiment, circuit to be protected can be protected by two lines road.Wherein, a line
Road is voltage sensor 11, the route that plastic filter circuit 12 and transient protection circuit 13 form, and passes through transient state guarantor in the route
If protection circuit 13 detects voltage signal the first outage condition of satisfaction after shaping filter, passes through or the output power-off of door 15 is believed
Number, to cut off circuit to be protected；Another route is voltage sensor 11, plastic filter circuit 12 and inverse time-lag protection 14
The route of composition, if by inverse time-lag protection 14 detecting the voltage signal after shaping filter in the route, to meet second disconnected
Electric condition, then pass through or door 15 exports power-off signal, to cut off circuit to be protected.
Specifically, the first outage condition reaches the first reference voltage for the voltage signal after shaping filter；Second power-off item
It is excessively electric after part has been more than normal voltage for the voltage signal after shaping filter, and overvoltage product maintains the sufficiently long time
Pressure is tired to have reached the second reference voltage.
In the prior art, emergency protection circuit device for electric uses the protected mode of multisection type, and safety is poor, and reliability is low.With
The emergency protection circuit device for electric of existing over-voltage is compared, the urgent guarantor of the over-voltage in the utility model embodiment
Protection circuit device first passes through the voltage signal that voltage sensor 11 acquires electric system, then passes through 12 pairs of electricity of plastic filter circuit
It presses signal to carry out shaping filter processing, the voltage signal after shaping filter is transmitted separately to transient protection circuit 13 and inverse time lag
Protect circuit 14, and then if transient protection circuit 13 detect the voltage signal after shaping filter meet the first outage condition or
When inverse time-lag protection 14 detects that the voltage signal after shaping filter meets the second outage condition, by or door 15 export it is disconnected
Electric signal, to cut off circuit to be protected.In device in the utility model, if on the one hand the voltage signal after shaping filter reaches
When to the first reference voltage (meeting the first outage condition), power-off signal can be exported by transient protection circuit 13, instantaneously
Cut off circuit to be protected；On the other hand, if the voltage signal after shaping filter is not very big, but long enough is held time,
When overvoltage accumulation reaches the second reference voltage (meeting the second outage condition), it can be exported by inverse time-lag protection 14
Power-off signal, delay cutoff circuit to be protected, the device not only allow for Overvoltage Amplitude at work, it is also contemplated that overvoltage
It holds time, in use, safer, high reliablity, alleviates the multisection type protection side of existing emergency protection circuit device for electric
Formula safety is poor, the low problem of reliability.
Above content has carried out overall description to the emergency protection circuit device for electric of over-voltage, below to over-voltage
Emergency protection circuit device for electric describe in detail.
In one optionally embodiment, with reference to Fig. 2, plastic filter circuit 12 includes: shaping circuit 121 and filtered electrical
Road 122.
In one optionally embodiment, with reference to Fig. 3, transient protection circuit 13 includes: first comparator 131；
The positive input of first comparator 131 is connect with filter circuit 122, the reverse input end of first comparator 131
Connect the first reference voltage, the output end of first comparator 131 with or the input terminal of door 15 connect, wherein the first outage condition
It is greater than the first reference voltage for the voltage signal after shaping filter.
In one optionally embodiment, with reference to Fig. 3, inverse time-lag protection 14 includes: voltage follower 141, is subtracted
Musical instruments used in a Buddhist or Taoist mass 142, integrator 143 and the second comparator 144；
The input terminal of voltage follower 141 is connect with filter circuit 122, the output end and subtracter of voltage follower 141
142 reverse input end connection；
The positive input of subtracter 142 is connect with normal voltage, and the output end of subtracter 142 is connect with integrator 143,
Voltage difference of the subtracter 142 for voltage signal and normal voltage after obtaining shaping filter, and voltage difference is transmitted to integral
Device 143；
The output end of integrator 143 is connect with the positive input of the second comparator 144, and integrator 143 is used for voltage
Difference is integrated, and by the voltage transmission after integral to the positive input of the second comparator 144；
The reverse input end of second comparator 144 connects the second reference voltage, the output end of the second comparator 144 and or door
15 input terminal connection, wherein the second outage condition is that the voltage after integral is greater than the second reference voltage.
Specifically, the first reference voltage is greater than the second reference voltage, the integral coefficient of integrator 143 is adjustable.
It is described in detail below with a specific embodiment to the course of work of the device of the utility model:
The case where the first situation: overvoltage is very big, insantaneous break
After above-mentioned apparatus is accessed electric system, voltage sensor 11 acquires the voltage signal of electric system, for example acquires
Obtained voltage signal is 300V, then by having obtained the voltage signal of pure 300V after shaping filter.
13 course of work of transient protection circuit: on the one hand obtained 300V voltage signal is accessed into first comparator 131
Positive input, if the first reference voltage for connecting of the reverse input end of first comparator 131 is 299V, at this time
First comparator 131 export at once high level to or door 15 an input terminal；
14 course of work of inverse time-lag protection: the voltage signal of above-mentioned 300V can also enter voltage follower 141, subtract
The voltage signal of 300V and normal voltage (such as 220V) are carried out subtraction, obtain voltage difference by musical instruments used in a Buddhist or Taoist mass 142, subtracter 142
For 80V, obtained 80V voltage difference is integrated further to integrator 143 (assuming that the integral coefficient of integrator 143 is 1),
The positive input that the voltage obtained after integral enters the second comparator 144 connects, if the reversed input of the second comparator 144
End the second reference voltage of connection is 159V, then 80V voltage difference needs integral (143 integral coefficient of integrator by 2 second time
When being 1) 160V can be just obtained, the voltage after could making integral is greater than the second reference voltage, at this point, the second comparator 144 is
Can export high level to or door 15 another input terminal, that is to say, that the inverse time-lag protection 14 can have certain time
Delay, this is theoretic process.
In the actual working process, as long as the voltage signal after shaping filter is greater than the first reference voltage, regardless of inverse time
The working condition of limit protection circuit 14 or the output end of door 15 export high level certainly, do not need to be delayed, cut off immediately to be protected
Circuit.Specifically, the high level is power-off signal.
Second situation: overvoltage be not it is very big, the case where delay cutoff
After above-mentioned apparatus is accessed electric system, voltage sensor 11 acquires the voltage signal of electric system, for example acquires
Obtained voltage signal is 230V, then by having obtained the voltage signal of pure 230V after shaping filter.
13 course of work of transient protection circuit: on the one hand obtained 230V voltage signal is accessed into first comparator 131
Positive input, if the first reference voltage for connecting of the reverse input end of first comparator 131 is 299V, at this time
First comparator 131 to or door 15 export be low level；
14 course of work of inverse time-lag protection: the voltage signal of above-mentioned 230V can also enter voltage follower 141, subtract
The voltage signal of 230V and normal voltage (such as 220V) are carried out subtraction, obtain voltage difference by musical instruments used in a Buddhist or Taoist mass 142, subtracter 142
For 10V, obtained 10V voltage difference is integrated further to integrator 143 (assuming that the integral coefficient of integrator 143 is 1),
The positive input that the voltage obtained after integral enters the second comparator 144 connects, if the reversed input of the second comparator 144
End the second reference voltage of connection is 99V, then 10V voltage difference needs integral (143 integral coefficient of integrator by 10 second time
When being 1) 100V can be just obtained, the voltage after could making integral is greater than the second reference voltage, at this point, the second comparator 144 is
Can to or door 15 export high level, and then or door 15 could export high level to cut off circuit to be protected.
It should be understood that voltage=voltage difference * integral coefficient * time of integration after integral.So being integrated by adjusting
Coefficient can be realized the adjusting to the time limit, and integral coefficient is bigger, and the time limit is smaller, that is, overvoltage hold time it is shorter.
In one optionally embodiment, the device further include: shell；
Voltage sensor 11, plastic filter circuit 12, transient protection circuit 13 and inverse time-lag protection 14 are set to outer
In shell, wherein shell is for protecting voltage sensor 11, plastic filter circuit 12, transient protection circuit 13 and inverse time-lag protection
Circuit 14.
In one optionally embodiment, with reference to Fig. 4, the device further include: alarm 16；
The setting of alarm 16 and the surface of shell, and alarm 16 with or the output end of door 15 connect, wherein when or door 15
When exporting power-off signal, alarm 16 is alarmed.
Specifically, alarm 16 is combined aural and visual alarm 16.
Embodiment two:
A kind of emergency protective circuit system of over-voltage, the system include the over-voltage in above-described embodiment
Emergency protection circuit device for electric further includes electric system；
Wherein, the emergency protection circuit device for electric of over-voltage is installed in electric system.
In addition, in the description of the utility model embodiment unless specifically defined or limited otherwise, term " installation ",
" connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally connect
It connects；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, can also indirectly connected through an intermediary, it can
To be the connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood with concrete condition
Concrete meaning in the present invention.
It is in the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have it is specific
Orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.In addition, term " the
One ", " second ", " third " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
Finally, it should be noted that embodiment described above, only specific embodiment of the present utility model, to illustrate this
The technical solution of utility model, rather than its limitations, the protection scope of the utility model is not limited thereto, although referring to aforementioned
The utility model is described in detail in embodiment, those skilled in the art should understand that: it is any to be familiar with this skill
The technical staff in art field within the technical scope disclosed by the utility model, still can be to skill documented by previous embodiment
Art scheme modify or can readily occur in variation or equivalent replacement of some of the technical features；And these modifications,
Variation or replacement, the spirit and model of the utility model embodiment technical solution that it does not separate the essence of the corresponding technical solution
It encloses, should be covered within the scope of the utility model.Therefore, the protection scope of the utility model is answered described is wanted with right
Subject to the protection scope asked.
Claims (10)
1. a kind of emergency protection circuit device for electric of over-voltage, which is characterized in that described device includes: voltage sensor
(11), plastic filter circuit (12), transient protection circuit (13) and inverse time-lag protection (14)；
The voltage sensor (11) connect with the transmission line of electric system, and the voltage for acquiring the electric system is believed
Number, and the voltage signal is transmitted to the input terminal of the plastic filter circuit (12)；
The output end of the plastic filter circuit (12) respectively with the transient protection circuit (13), the inverse time-lag protection
(14) it connects, the voltage signal that the plastic filter circuit (12) is used to acquire the voltage sensor (11) carries out whole
Voltage signal after shaping filter is transmitted separately to the transient protection circuit (13) and the inverse time lag protects by shape filtering processing
Protection circuit (14)；
The transient protection circuit (13) and the inverse time-lag protection (14) pass through or door (15) and circuit connection to be protected,
Wherein, when the voltage signal after the transient protection circuit (13) detects the shaping filter meets the first outage condition,
Or voltage signal after the inverse time-lag protection (14) detects the shaping filter leads to when meeting the second outage condition
Described or door (15) output power-off signal is crossed, to cut off the circuit to be protected.
2. the apparatus according to claim 1, which is characterized in that the plastic filter circuit (12) includes: shaping circuit
(121) and filter circuit (122).
3. the apparatus of claim 2, which is characterized in that the transient protection circuit (13) includes: first comparator
(131)；
The positive input of the first comparator (131) is connect with the filter circuit, the first comparator (131) it is anti-
The first reference voltage is connected to input terminal, the output end of the first comparator (131) and the input terminal of described or door (15) connect
It connects, wherein first outage condition is that the voltage signal after the shaping filter is greater than first reference voltage.
4. device according to claim 3, which is characterized in that the inverse time-lag protection (14) includes: voltage follow
Device (141), subtracter (142), integrator (143) and the second comparator (144)；
The input terminal of the voltage follower (141) is connect with the filter circuit (122), the voltage follower (141)
Output end is connect with the reverse input end of the subtracter (142)；
The positive input of the subtracter (142) is connect with normal voltage, the output end of the subtracter (142) and the product
Point device (143) connection, the subtracter (142) are used to obtain voltage signal after the shaping filter and the normal voltage
Voltage difference, and the voltage difference is transmitted to the integrator (143)；
The output end of the integrator (143) is connect with the positive input of second comparator (144), the integrator
(143) for being integrated to the voltage difference, and by the voltage transmission after integral to the forward direction of second comparator (144)
Input terminal；
The reverse input end of second comparator (144) connects the second reference voltage, the output of second comparator (144)
End is connect with the input terminal of described or door (15), wherein second outage condition is greater than described for the voltage after the integral
Second reference voltage.
5. device according to claim 4, which is characterized in that first reference voltage is greater than described second with reference to electricity
Pressure.
6. device according to claim 4, which is characterized in that the integral coefficient of the integrator (143) is adjustable.
7. the apparatus according to claim 1, which is characterized in that described device further include: shell；
The voltage sensor (11), the plastic filter circuit (12), the transient protection circuit (13) and the inverse time lag
Protection circuit (14) is set in the shell, wherein the shell is for protecting the voltage sensor (11), the shaping
Filter circuit (12), the transient protection circuit (13) and the inverse time-lag protection (14).
8. device according to claim 7, which is characterized in that further include: alarm (16)；
The surface of alarm (16) setting and the shell, and the output end of the alarm (16) and described or door (15)
Connection, wherein when described or door (15) export power-off signal, the alarm (16) is alarmed.
9. device according to claim 8, which is characterized in that the alarm (16) is combined aural and visual alarm.
10. a kind of emergency protective circuit system of over-voltage, which is characterized in that the system comprises the claims 1
It further include electric system to the emergency protection circuit device for electric of over-voltage described in any one of 9；
Wherein, the emergency protection circuit device for electric of the over-voltage is installed in the electric system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822045690.9U CN209250214U (en) | 2018-12-06 | 2018-12-06 | A kind of emergency protection circuit device for electric and system of over-voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822045690.9U CN209250214U (en) | 2018-12-06 | 2018-12-06 | A kind of emergency protection circuit device for electric and system of over-voltage |
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| Publication Number | Publication Date |
|---|---|
| CN209250214U true CN209250214U (en) | 2019-08-13 |
Family
ID=67531771
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822045690.9U Active CN209250214U (en) | 2018-12-06 | 2018-12-06 | A kind of emergency protection circuit device for electric and system of over-voltage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112003236A (en) * | 2020-08-28 | 2020-11-27 | 杭州海兴电力科技股份有限公司 | Overvoltage and overcurrent protection system for electric energy meter |
| WO2022027919A1 (en) * | 2020-08-05 | 2022-02-10 | 广东美的白色家电技术创新中心有限公司 | Over voltage protection circuit and electronic device |
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2018
- 2018-12-06 CN CN201822045690.9U patent/CN209250214U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022027919A1 (en) * | 2020-08-05 | 2022-02-10 | 广东美的白色家电技术创新中心有限公司 | Over voltage protection circuit and electronic device |
| CN112003236A (en) * | 2020-08-28 | 2020-11-27 | 杭州海兴电力科技股份有限公司 | Overvoltage and overcurrent protection system for electric energy meter |
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