CN109444522A - Lightning stroke detection trigger circuit - Google Patents
Lightning stroke detection trigger circuit Download PDFInfo
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- CN109444522A CN109444522A CN201811610695.XA CN201811610695A CN109444522A CN 109444522 A CN109444522 A CN 109444522A CN 201811610695 A CN201811610695 A CN 201811610695A CN 109444522 A CN109444522 A CN 109444522A
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- 238000001514 detection method Methods 0.000 title claims abstract description 115
- 208000025274 Lightning injury Diseases 0.000 title claims abstract description 103
- 238000005070 sampling Methods 0.000 claims description 41
- 238000012545 processing Methods 0.000 claims description 30
- 230000009471 action Effects 0.000 claims description 19
- 230000005611 electricity Effects 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 13
- 230000000630 rising effect Effects 0.000 claims description 5
- 238000010248 power generation Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 230000001960 triggered effect Effects 0.000 description 12
- 239000003990 capacitor Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 5
- 230000008033 biological extinction Effects 0.000 description 3
- 230000003534 oscillatory effect Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000007688 edging Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
Abstract
The present invention relates to a kind of lightning strokes to detect trigger circuit, comprising: sample circuit, positive polarity lightning stroke trigger circuit and negative polarity lightning stroke trigger circuit；Sample circuit is connect with the input terminal of the input terminal of positive polarity lightning stroke trigger circuit and negative polarity lightning stroke trigger circuit respectively；Sample circuit exports the first sampled signal to positive polarity lightning stroke trigger circuit and negative polarity lightning stroke trigger circuit for receiving thunder-strike current signal, according to thunder-strike current signal；The output end of positive polarity lightning stroke trigger circuit is for connecting thunder-strike current detection device.The present invention can trigger thunder-strike current detection device for the thunder-strike current of opposed polarity, two kinds of polar thunder-strike currents can be covered, so that the monitoring for lightning current is more comprehensive.
Description
Technical field
The present invention relates to thunder and lightning detection technique fields, detect trigger circuit more particularly to a kind of lightning stroke.
Background technique
Thunder and lightning can generate biggish thunder-strike current when occurring, and power equipment may be damaged, in order to reduce damage caused by thunder and lightning
It loses, in addition to needing lightning protection device to be protected, usually also needs to be monitored thunder and lightning, thunder and lightning is analyzed by monitoring result
Characteristic and mechanics and the lightning stroke weak spot of power grid etc. select significantly more efficient thunder And Lightning Preventive Measures according to analysis, build
Vertical more perfect thunderstorm electricity protective device.
But the generation of thunder and lightning has ambiguity, and in order to guarantee the integrality of monitoring result, monitoring device needs are chronically at
Working condition, energy consumption are higher.
Summary of the invention
Based on this, it is necessary to a kind of lightning stroke detection trigger circuit is provided, it being capable of comprehensive monitoring lightning current.
A kind of lightning stroke detection trigger circuit, comprising: sample circuit, positive polarity lightning stroke trigger circuit and negative polarity lightning stroke triggering
Circuit；Input terminal of the sample circuit respectively with the input terminal of positive polarity lightning stroke trigger circuit and negative polarity lightning stroke trigger circuit connects
It connects；Sample circuit exports the first sampled signal to positive polarity according to thunder-strike current signal and is struck by lightning for receiving thunder-strike current signal
Trigger circuit and negative polarity lightning stroke trigger circuit, when thunder-strike current signal is positive polarity thunder-strike current signal, the first sampling letter
Number be positive polarity sampled signal, when thunder-strike current signal be negative polarity thunder-strike current signal when, the first sampled signal be negative polarity
Sampled signal；The output end of positive polarity lightning stroke trigger circuit is for connecting thunder-strike current detection device；Positive polarity lightning stroke triggering electricity
It is triggered for being connected when the first sampled signal is positive polarity sampled signal to thunder-strike current detection device output cathode on road
Signal；The output end of negative polarity lightning stroke trigger circuit is used to connection thunder-strike current detection device；Negative polarity lightning stroke trigger circuit,
For being connected when the first sampled signal is negative polarity sampled signal, triggers and believe to thunder-strike current detection device output negative pole
Number.
Sample circuit includes current signal receiving unit and sampling unit in one of the embodiments,；Current signal connects
It receives unit to connect with sampling unit, for receiving thunder-strike current signal and exporting to sampling unit；Sampling unit and positive polarity thunder
The input terminal of trigger circuit and the input terminal connection of negative polarity lightning stroke trigger circuit are hit, for thunder-strike current signal to be converted to the
One sampled signal, output to positive polarity lightning stroke trigger circuit and negative polarity lightning stroke trigger circuit, first sampled signal are electricity
Press signal.
Positive polarity lightning stroke trigger circuit includes: the first edge capture unit and first switch in one of the embodiments,
Unit；The input terminal of first edge capture unit connects sampling unit, and output end connects first switch unit, for capturing just
When first rising edge signal of polarity sampled signal, output cathode action signal to first switch unit；First switch list
The output end of member acts, output cathode touching for connecting thunder-strike current detection device after receiving positive polarity action signal
It signals to thunder-strike current detection device.
Negative polarity lightning stroke trigger circuit includes: the second edge capture unit and second switch in one of the embodiments,
Unit；The input terminal of second edge capture unit connects sampling unit, and output end connects second switch unit, negative for capturing
When first failing edge signal of polarity sampled signal, output negative pole action signal to second switch unit；Second switch list
The output end of member acts, output negative pole touching for connecting thunder-strike current detection device after receiving negative polarity action signal
It signals to thunder-strike current detection device.
Lightning stroke detection trigger circuit in one of the embodiments, further include: current detection circuit and processing unit；Electric current
Signal receiving unit is also used to receive the leakage current signal of lightning overvoltage protection device generation and exports to sampling unit；It takes
Sample unit is also used to be converted to leakage current signal the second sampled signal, output to the current detection circuit, and described second
Sampled signal is voltage signal；The input terminal of current detection circuit is connect with sampling unit, and output end connects processing unit, is used for
The second sampled signal is received, and exports detection signal to processing unit after the second sampled signal is amplified；Processing unit is used
It is handled in detection signal, obtains the testing result of leakage current signal.
Current detection circuit includes being respectively used to detect different range ability leakage current letters in one of the embodiments,
Number the first detection circuit and the second detection circuit；The input terminal of first detection circuit connects sampling unit, output end junction
Manage unit；The input terminal of second detection circuit connects sampling unit, and output end connects processing unit.
Current signal receiving unit includes: current sensor, the secondary side of current sensor in one of the embodiments,
In parallel with sampling unit, primary side is for receiving thunder-strike current signal and leakage current signal.
Current sensor is low magneto-resistive current sensor in one of the embodiments,.
First switch unit includes: NPN triode in one of the embodiments,；The base stage of NPN triode and the first side
Output end along capture unit connects, and emitter ground connection, collector is for connecting power supply and thunder-strike current detection device.
Second switch unit includes: PNP triode in one of the embodiments,；The base stage of PNP triode and the second side
Output end along capture unit connects, and emitter connects power supply, and collector is for connecting thunder-strike current detection device and ground connection.
Above-mentioned trigger circuit is sampled thunder-strike current using sample circuit, for the thunder-strike current point of opposed polarity
Not by positive polarity lightning stroke trigger circuit and negative polarity lightning stroke trigger circuit triggers thunder-strike current detection device, thunder can generated
Thunder-strike current detection device is triggered when hitting again to be detected, energy consumption is reduced, and two kinds of polar thunder-strike currents can be covered, makes
It obtains more comprehensive for the monitoring of lightning current.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of trigger circuit in one embodiment；
Fig. 2 is the structural schematic diagram of trigger circuit and its internal portions in one embodiment；
Fig. 3 is the structural schematic diagram of trigger circuit in another embodiment；
Fig. 4 is the electrical block diagram of trigger circuit in one embodiment；
Fig. 5 is the electrical block diagram of trigger circuit in another embodiment.
Specific embodiment
It to facilitate the understanding of the present invention, below will be to invention is more fully described.But the present invention can be to be permitted
Mostly different form is realized, however it is not limited to embodiment described herein.On the contrary, purpose of providing these embodiments is makes
It is more thorough and comprehensive to the understanding of the disclosure.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.
In a specific embodiment, a kind of lightning stroke detects trigger circuit, as shown in Figure 1, comprising: sample circuit 100,
Positive polarity lightning stroke trigger circuit 200 and negative polarity lightning stroke trigger circuit 300；Sample circuit 100 is struck by lightning with positive polarity respectively to be triggered
The input terminal connection of input terminal and negative polarity the lightning stroke trigger circuit 300 of circuit 200；Sample circuit 100 is for receiving lightning stroke electricity
Signal is flowed, exports the first sampled signal to positive polarity lightning stroke trigger circuit 200 and negative polarity lightning stroke touching according to thunder-strike current signal
Power Generation Road 300, when thunder-strike current signal is positive polarity thunder-strike current signal, the first sampled signal is positive polarity sampled signal,
When thunder-strike current signal is negative polarity thunder-strike current signal, the first sampled signal is negative polarity sampled signal；Positive polarity lightning stroke
The output end of trigger circuit 200 is for connecting thunder-strike current detection device；Positive polarity lightning stroke trigger circuit 200, for first
Sampled signal is connected when being positive polarity sampled signal, to thunder-strike current detection device output cathode trigger signal；Negative polarity thunder
The output end for hitting trigger circuit 300 is used to connection thunder-strike current detection device；Negative polarity lightning stroke trigger circuit 300, is used for
First sampled signal is connected when being negative polarity sampled signal, to thunder-strike current detection device output negative pole trigger signal.
The thunder-strike current signal that lightning stroke generates can be positive polarity thunder-strike current signal or negative polarity thunder-strike current signal, take
After sample circuit 100 receives thunder-strike current signal, it is defeated as the first sampled signal that thunder-strike current signal is converted into voltage signal
Out to positive polarity lightning stroke trigger circuit 200 and negative polarity lightning stroke trigger circuit 300, when thunder-strike current signal is positive polarity lightning stroke
When current signal, 100 output cathode sampled signal of sample circuit, negative polarity lightning stroke trigger circuit 300 is not turned on, positive polarity thunder
The conducting of trigger circuit 200 is hit, and output cathode trigger signal V1 is detected to thunder-strike current detection device to trigger thunder-strike current
Device detects positive polarity thunder-strike current signal, and thunder-strike current detection device may include having electricity in some embodiments
The single-chip microcontroller of current detection functionality also may include current detection circuit；When thunder-strike current signal is negative polarity thunder-strike current signal
When, 100 output negative pole sampled signal of sample circuit, positive polarity lightning stroke trigger circuit 200 is not turned on, negative polarity lightning stroke triggering electricity
Road 300 is connected, and output negative pole trigger signal V2 is to thunder-strike current detection device, to trigger thunder-strike current detection device to negative
Polarity thunder-strike current signal is detected.
Trigger circuit of the invention can be suitable for two kinds of polar thunder-strike currents, by first to the thunder-strike current received
Signal is sampled, after sampled signal conducting positive polarity lightning stroke trigger circuit 200 or negative polarity lightning stroke trigger circuit 300,
Triggering thunder-strike current detection device indirectly, guarantees the reliability of triggering, and can be avoided due to the excessive damage of thunder-strike current signal
Bad circuit.
In one of the embodiments, as shown in Fig. 2, sample circuit 100 includes current signal receiving unit 110 and sampling
Unit 120；Current signal receiving unit 110 is connect with sampling unit 120, for receiving thunder-strike current signal and exporting to sampling
Unit 120；Sampling unit 120 and positive polarity lightning stroke trigger circuit 200 input terminal and negative polarity lightning stroke trigger circuit 300 it is defeated
Enter end connection, for thunder-strike current signal to be converted to the first sampled signal, output is to positive polarity lightning stroke trigger circuit 200 and bears
Polarity lightning stroke trigger circuit 300, the first sampled signal are voltage signal.
Current signal receiving unit 110 is for receiving thunder-strike current signal and exporting to sampling unit 120, sampling unit
120 for converting voltage signal as the first sampled signal for the thunder-strike current signal received, and output to positive polarity is struck by lightning
Trigger circuit 200 and negative polarity lightning stroke trigger circuit 300.It is triggered with directly exporting thunder-strike current signal to measuring circuit
It compares, as long as current signal receiving unit 110 receives thunder-strike current signal, it is ensured that sampling unit 120 can export
One sampled signal is triggered, and makes it possible to obtain the testing result of thunder-strike current signal as completely as possible.
In one of the embodiments, as shown in Fig. 2, positive polarity lightning stroke trigger circuit 200 includes: that the first edge captures list
Member 210 and first switch unit 220；The input terminal of first edge capture unit 210 connects sampling unit 120, output end connection
First switch unit 220, when for capturing first rising edge signal of positive polarity sampled signal, output cathode movement letter
Number to first switch unit 220；The output end of first switch unit 220 is being received for connecting thunder-strike current detection device
It is acted after positive polarity action signal, output cathode trigger signal to thunder-strike current detection device.
Due to the signal that the current signal that lightning discharge generates is the variation of an oscillatory extinction, in order to guarantee as far as possible
Completely thunder-strike current is detected, therefore the mode of edging trigger is taken to be triggered, when the first sampled signal is anode
Property sampled signal when, pass through the first edge capture unit 210 capture positive polarity lightning strike signals first rising edge signal conduct
Positive polarity action signal, filters out the signal of subsequent oscillatory extinction, and output cathode action signal to first switch unit 220 carries out
Triggering, first switch unit 220 are triggered movement after receiving positive polarity action signal, and output cathode trigger signal V1 is extremely
Thunder-strike current detection device, thunder-strike current detection device will be triggered after receiving positive polarity trigger signal V1, and to anode
Property thunder-strike current detected, when the first sampled signal be negative polarity sampled signal when, first switch unit 220 will not be triggered
Movement.
In one of the embodiments, as shown in Fig. 2, negative polarity lightning stroke trigger circuit 300 includes: that the second edge captures list
Member 310 and second switch unit 320；The input terminal of second edge capture unit 310 connects sampling unit 120, output end connection
Second switch unit 320, when for capturing first failing edge signal of negative polarity sampled signal, output negative pole movement letter
Number to second switch unit 320；The output end of second switch unit 320 is being received for connecting thunder-strike current detection device
It is acted after negative polarity action signal, output negative pole trigger signal to thunder-strike current detection device.
The mode of edging trigger is equally taken to trigger negative polarity lightning stroke, when the first sampled signal takes for negative polarity
When sample signal, first failing edge signal of negative polarity lightning strike signals is captured as cathode by the second edge capture unit 310
Property action signal, filters out the signal of subsequent oscillatory extinction, output negative pole action signal to second switch unit 320 is touched
Hair, second switch unit 320 are triggered movement after receiving negative polarity action signal, output negative pole trigger signal V2 to thunder
Current detection means is hit, thunder-strike current detection device will be triggered after receiving negative polarity trigger signal V2, and to negative polarity
Thunder-strike current is detected, and when the first sampled signal is positive polarity sampled signal, second switch unit 320 will not be triggered dynamic
Make.
In one of the embodiments, as shown in figure 3, lightning stroke detection trigger circuit further include: current detection circuit 400 and
Processing unit (not shown)；Current signal receiving unit is also used to receive the leakage electricity of lightning overvoltage protection device generation
It flows signal and exports to sampling unit；Sampling unit is also used to be converted to leakage current signal the second sampled signal, and output is extremely
The current detection circuit, the second sampled signal are voltage signal；The input terminal and sampling unit 120 of current detection circuit 400
Connection, output end connects processing unit, for receiving sampled signal, and detection letter is exported after the second sampled signal is amplified
Number to processing unit；Processing unit is used to handle detection signal, obtains the testing result of leakage current signal.
Current signal receiving unit 110 is also used to receive the overvoltage in thunder resisting equipment in addition to receiving thunder-strike current signal
The leakage current that protective device generates, and taken according to the leakage current output sensed current signal received to sampling unit 120
Sample unit 120 is sampled after will test current signal conversion voltage signal, the second sampled signal of output to current detection circuit
400, after current detection circuit 400 receives the second sampled signal, the second sampled signal is amplified, and exports single to handling
Member is handled, and processing unit can be single-chip microcontroller or computer equipment etc., due to receiving leakage current and thunder-strike current
Signal Shi Junhui exports sampled signal to current detection circuit 400, the inspection exported through the processing unit to current detection circuit 400
It surveys signal and carries out judgement differentiation, obtain the testing result of leakage current.
The present invention can be while carrying out stablizing triggering to thunder-strike current detection device, moreover it is possible to what is be not struck by lightning usually
When overvoltage protection is monitored, when leakage current be greater than threshold value when, then it represents that overvoltage protection occur therefore
Barrier or damage, can be repaired or replaced in time.
In one of the embodiments, as shown in figure 5, current detection circuit 400 includes being respectively used to detect different ranges
The first detection circuit and the second detection circuit of range leakage current signal；The input terminal of first detection circuit connects sampling unit
120, output end connects processing unit；The input terminal of second detection circuit connects sampling unit 120, and output end connection processing is single
Member.
The first detection circuit and the second detection circuit for being able to detect different range ability electric currents is set as needed, expands
The detection circuit of more range abilities can also be arranged in some embodiments in the measurement range of leakage current.
Current signal receiving unit 110 includes: current sensor in one of the embodiments, and the two of current sensor
Secondary side is in parallel with sampling unit 120, and primary side is for receiving thunder-strike current signal and leakage current signal.
It, can if directly handled the thunder-strike current signal received since lightning discharge electric current is generally all larger
Circuit or other equipment can be damaged, therefore be received using current sensor, the primary side of current sensor is for receiving thunder
The leakage current of current signal and overvoltage protection is hit, secondary side exports induced current according to the electric current that primary side receives
Induced current is handled again afterwards, protects circuit and other power equipments.
Current sensor is low magneto-resistive current sensor in one of the embodiments,.
The currently used current sensor for receiving thunder-strike current is Rogowski coil, and Rogowski coil has high current not
The advantages of saturation and excellent in high-frequency characteristics, but the change rate of thunder-strike current is very big, and edge is precipitous, and electric current can rapidly increase to peak
Value, current duration is short, and the electric current directly exported with Rogowski coil secondary side carries out wake-up to thunder-strike current detection device will
The portion of electrical current data or entire thunder-strike current data that will lead to lightning stroke beginning can not acquire, and low magneto-resistive current sensor compares sieve
Family name's coil is sensitiveer reliable, can be realized the complete acquisition of thunder-strike current data.
In one of the embodiments, as shown in Figure 4, Figure 5, first switch unit 220 includes: NPN triode Q1；NPN
The base stage of triode Q1 is connect with the output end of the first edge capture unit 210, and emitter ground connection, collector is for connecting power supply
VCC and thunder-strike current detection device.
First switch unit 220 be used for when sampled signal be positive polarity lightning strike signals when act, by NPN triode Q1 into
Row switch control, 210 output cathode action signal of the first edge capture unit to base stage, NPN triode Q1 conducting, collector
Output cathode trigger signal V1 is to thunder-strike current detection device.
In one of the embodiments, as shown in Figure 4, Figure 5, second switch unit 320 includes: PNP triode Q2；PNP
The base stage of triode Q2 is connect with the output end of the second edge capture unit 310, and emitter meets power supply VCC, and collector is for connecting
Connect thunder-strike current detection device and ground connection.
Second switch unit 320 be used for when sampled signal be negative polarity lightning strike signals when act, by PNP triode Q2 into
Row switch control, 310 output negative pole action signal of the second edge capture unit to base stage, PNP triode Q2 conducting, collector
Output negative pole trigger signal V2 is to thunder-strike current detection device.
In one embodiment, the principle of the present invention is described in detail in conjunction with Fig. 5:
The primary side of current transformer T is for receiving lightning discharge electric current and overvoltage protection leakage current, transient state
Voltage inhibits protection diode D5 for protecting circuit, prevents due to the excessive damage component of electric current or circuit, sampling unit 120
Including sample resistance R8, when the primary side of current transformer T receives positive polarity lightning discharge current signal, secondary side output
For positive polarity lightning strike signals to sample resistance R8, positive polarity lightning strike signals are converted to sampled signal by sample resistance R8, and will be sampled
Signal is exported simultaneously to positive polarity lightning stroke trigger circuit, negative polarity lightning stroke trigger circuit and current detection circuit, sample resistance R8
First end be separately connected positive polarity lightning stroke trigger circuit, negative polarity lightning stroke trigger circuit and current detection circuit, the second termination
Ground, since the sampled signal of positive polarity lightning strike signals is also positive polarity, negative polarity lightning stroke trigger circuit will not be acted, current detecting
Circuit will detect sampled signal, and output is selected to processing unit, and processing unit will judge the testing result
It is not belonging to the leakage current of overvoltage protection；First edge capture unit 210 of positive polarity lightning stroke trigger circuit includes electricity
Hold C1 and resistance R1, it will be filtered to sampled signal, and capture first rising edge signal as positive polarity action signal
The base stage of the NPN triode Q1 into first switch unit 220 is exported, the emitter ground connection of NPN triode Q1, collector is by electricity
Resistance R2 is connect with power supply VCC, and base stage and transmitting interpolar are connected with diode D1, and the anode of diode D1 connects emitter, cathode
Base stage is connected, for protecting NPN triode Q1 not to be reversed high electrical breakdown, the collector of NPN triode Q1 passes through resistance
R3 connection thunder-strike current detection device, also sets up diode D2 and capacitor C2 is protected and filtered, and the anode of diode D2 connects
Ground, cathode connect emitter, and the first end of resistance R3 connects emitter, and second end connects thunder-strike current detection device, capacitor C2
First end connection resistance R3 second end, capacitor C2 second end ground connection；NPN triode Q1 is receiving positive polarity movement letter
It is connected after number, output cathode trigger signal V1 to thunder-strike current detection device.
When the primary side of current transformer T receives negative polarity lightning discharge current signal, secondary side output negative pole
Negative polarity lightning strike signals are converted to sampled signal to sample resistance R8, sample resistance R8 by lightning strike signals, and sampled signal is same
When export to negative polarity lightning stroke trigger circuit, positive polarity lightning stroke trigger circuit and current detection circuit, the first of sample resistance R8
End is separately connected positive polarity lightning stroke trigger circuit, negative polarity lightning stroke trigger circuit and current detection circuit, second end and is grounded, due to
The sampled signal of negative polarity lightning strike signals is also negative polarity, and positive polarity lightning stroke trigger circuit will not act, and current detection circuit will
Sampled signal can be detected, output is selected to processing unit, and processing unit will judge the testing result and be not belonging to
The leakage current of overvoltage protection；Negative polarity be struck by lightning trigger circuit the second edge capture unit 310 include capacitor C3 and
Resistance R4, it will sampled signal is filtered, and capture first failing edge signal as negative polarity action signal export to
The base stage of PNP triode Q2 in second switch unit 320, the emitter of PNP triode Q2 meet power supply VCC, and collector is by electricity
R6 ground connection is hindered, base stage is connected with diode D3 and resistance R5 in parallel with transmitting interpolar, and the anode of diode D3 connects base stage, yin
Pole connects emitter, and resistance R5 is parallel to the both ends diode D3, and high voltage will not be reversed by being provided commonly for protection PNP triode Q2
Breakdown, the collector of PNP triode Q2 also set up diode D4 and capacitor C4 by resistance R7 connection thunder-strike current detection device
It is protected and is filtered, the plus earth of diode D4, cathode connects collector, and the first end of resistance R7 connects collector, the
Two ends connect thunder-strike current detection device, the second end of the first end connection resistance R7 of capacitor C4, the second end ground connection of capacitor C4；
PNP triode Q2 is connected after receiving negative polarity action signal, and output negative pole trigger signal V2 to thunder-strike current, which is detected, to be filled
It sets.
When the primary side of current transformer T receives the leakage current of overvoltage protection, secondary side output detection
Current signal will test current signal and be converted to sampled signal to sample resistance R8, sample resistance R8, and simultaneously by sampled signal
It exports to current detection circuit, negative polarity lightning stroke trigger circuit and positive polarity lightning stroke trigger circuit, the first end of sample resistance R8
It is separately connected positive polarity lightning stroke trigger circuit, negative polarity lightning stroke trigger circuit and current detection circuit, second end ground connection, due to inspection
The sampled signal for surveying current signal is typically small, is unsatisfactory for triggering positive polarity lightning stroke trigger circuit and negative polarity lightning stroke trigger circuit
Turn-on condition, therefore positive polarity lightning stroke trigger circuit and negative polarity lightning stroke trigger circuit will not act, current detection circuit will
Sampled signal can be detected, output is selected to processing unit, and processing unit will judge the testing result and belong to
The leakage current of voltage protection, it will other processing are recorded or carried out to testing result；Current detection circuit includes
For protection location, the first detection circuit and the second detection circuit, protection location includes resistance R9, diode D6 and capacitor C5,
The first end of the first end connection sample resistance R8 of resistance R9, second end are separately connected the first detection circuit and the second detection electricity
Road, the second end of the cathode connection resistance R9 of diode D6, plus earth, the second of the first end connection resistance R9 of capacitor C5
End, second end ground connection；First detection circuit is for measuring high current, and the second detection circuit is for measuring low current, the first detection
The second end of the first end connection resistance R9 of resistance R11 in circuit, second end connect the electrode input end of amplifier, amplifier
Negative input be grounded by resistance R10, the negative input of the first end of resistance R12 connection amplifier, second end connection
The output end of amplifier, the output end of amplifier pass through resistance R14 connection processing unit, and resistance R14 is for connecting processing unit
One end also pass through capacitor C6 and be grounded；For to the high current received amplify rear output test result V3 to handle dress
It sets.The second end of the first end connection resistance R9 of resistance R16 in second detection circuit, the anode that second end connects amplifier are defeated
Entering end, the negative input of amplifier is grounded by resistance R15, the negative input of the first end connection amplifier of resistance R17,
Second end connects the output end of amplifier, and the output end of amplifier passes through resistance R18 connection processing unit, and resistance 18 is for connecting
One end of processing unit also passes through capacitor C7 and is grounded；For amplifying rear output test result V4 extremely to the low current received
Processing unit.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of lightning stroke detects trigger circuit characterized by comprising sample circuit, positive polarity lightning stroke trigger circuit and cathode
Property lightning stroke trigger circuit；
The sample circuit respectively with the positive polarity lightning stroke trigger circuit input terminal and the negative polarity be struck by lightning trigger circuit
Input terminal connection；The sample circuit takes for receiving thunder-strike current signal according to thunder-strike current signal output first
Sample signal is to positive polarity lightning stroke trigger circuit and negative polarity lightning stroke trigger circuit, when the thunder-strike current signal is positive
When polarity thunder-strike current signal, first sampled signal is positive polarity sampled signal, when the thunder-strike current signal is cathode
Property thunder-strike current signal when, first sampled signal be negative polarity sampled signal；
The output end of the positive polarity lightning stroke trigger circuit is for connecting thunder-strike current detection device；The positive polarity lightning stroke triggering
Circuit, for being connected when first sampled signal is positive polarity sampled signal, the output of Xiang Suoshu thunder-strike current detection device
Positive polarity trigger signal；
The output end of the negative polarity lightning stroke trigger circuit is used to connection thunder-strike current detection device；The negative polarity lightning stroke touching
Power Generation Road, for being connected when first sampled signal is negative polarity sampled signal, Xiang Suoshu thunder-strike current detection device is defeated
Negative polarity trigger signal out.
2. lightning stroke according to claim 1 detects trigger circuit, which is characterized in that the sample circuit includes current signal
Receiving unit and sampling unit；
The current signal receiving unit is connect with the sampling unit, for receiving the thunder-strike current signal and exporting to institute
State sampling unit；
The input terminal of the sampling unit and the positive polarity lightning stroke trigger circuit and negative polarity lightning stroke trigger circuit it is defeated
Enter end connection, for the thunder-strike current signal to be converted to the first sampled signal, output to the positive polarity, which is struck by lightning, triggers electricity
Road and negative polarity lightning stroke trigger circuit, first sampled signal are voltage signal.
3. lightning stroke according to claim 2 detects trigger circuit, which is characterized in that the positive polarity lightning stroke trigger circuit packet
It includes: the first edge capture unit and first switch unit；
The input terminal of first edge capture unit connects the sampling unit, and output end connects the first switch unit,
When for capturing first rising edge signal of the positive polarity sampled signal, output cathode action signal to described first
Switch unit；
The output end of the first switch unit is dynamic receiving the positive polarity for connecting the thunder-strike current detection device
It is acted after making signal, output cathode trigger signal to the thunder-strike current detection device.
4. lightning stroke according to claim 3 detects trigger circuit, which is characterized in that the negative polarity lightning stroke trigger circuit packet
It includes: the second edge capture unit and second switch unit；
The input terminal of second edge capture unit connects the sampling unit, and output end connects the second switch unit,
When for capturing first failing edge signal of the negative polarity sampled signal, output negative pole action signal to described second
Switch unit；
The output end of the second switch unit is dynamic receiving the negative polarity for connecting the thunder-strike current detection device
It is acted after making signal, output negative pole trigger signal to the thunder-strike current detection device.
5. lightning stroke according to claim 4 detects trigger circuit, which is characterized in that further include: current detection circuit and place
Manage unit；
The current signal receiving unit is also used to receive the leakage current signal of lightning overvoltage protection device generation and output
To the sampling unit；
The sampling unit is also used to be converted to leakage current signal the second sampled signal, output to the current detecting electricity
Road, second sampled signal are voltage signal；
The input terminal of the current detection circuit is connect with the sampling unit, and output end connects the processing unit, for connecing
Second sampled signal is received, and exports detection signal to the processing unit after second sampled signal is amplified；
The processing unit obtains the testing result of the leakage current signal for handling the detection signal.
6. lightning stroke according to claim 5 detects trigger circuit, which is characterized in that the current detection circuit includes difference
For detecting the first detection circuit and the second detection circuit of different range ability leakage current signals；
The input terminal of first detection circuit connects the sampling unit, and output end connects the processing unit；
The input terminal of second detection circuit connects the sampling unit, and output end connects the processing unit.
7. lightning stroke according to claim 5 detects trigger circuit, which is characterized in that the current signal receiving unit packet
It includes: current sensor,
The secondary side of the current sensor is in parallel with the sampling unit, primary side for receive the thunder-strike current signal and
The leakage current signal.
8. lightning stroke according to claim 7 detects trigger circuit, feature exists, and the current sensor is low magneto-resistive current
Sensor.
9. detecting trigger circuit according to the described in any item lightning strokes of claim 3 to 8, which is characterized in that the first switch list
Member includes: NPN triode；
The base stage of the NPN triode is connect with the output end of first edge capture unit, and emitter ground connection, collector is used
In connection power supply and the thunder-strike current detection device.
10. detecting trigger circuit according to the described in any item lightning strokes of claim 4 to 8, which is characterized in that the second switch list
Member includes: PNP triode；
The base stage of the PNP triode is connect with the output end of second edge capture unit, and emitter connects the power supply, collection
Electrode is for connecting the thunder-strike current detection device and ground connection.
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