CN106771531A - Inductance disconnects electric arc start/stop time detection circuit and method - Google Patents
Inductance disconnects electric arc start/stop time detection circuit and method Download PDFInfo
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Abstract
Electric arc start/stop time detection circuit and method are disconnected the invention discloses a kind of inductance, its circuit includes that voltage signal processing circuit, split-phase delay circuit and compare output circuit；Voltage signal processing circuit includes instrumentation amplifier U1, resistance R1, resistance R2, resistance R3 and resistance R4, split-phase delay circuit include electric capacity C1, the first proportion resistor network being made up of resistance R5 and resistance R7, and the second proportion resistor network being made up of resistance R6 and resistance R8；Comparing output circuit includes comparator U2, d type flip flop U3 and resistance R10；Its method includes step：First, detection circuit connection, two, voltage signal treatment, three, inductance disconnect the detection of electric arc start/stop time.Circuit structure of the present invention is simple, realizes convenient and low cost, stable and reliable in work, can fast and effectively detect that inductance disconnects electric arc start/stop time, applied widely, with good application value.
Description
Technical field
Arc-detection technical field is disconnected the invention belongs to inductance, and in particular to a kind of inductance disconnects the inspection of electric arc start/stop time
Slowdown monitoring circuit and method.
Background technology
There is substantial amounts of inflammable, explosion hazard gases or material in the hazardous environments such as colliery, petrochemical industry, be applied to these occasions
Electronic and electrical equipment must is fulfilled for the requirement of essential safety.For the electronic equipment containing the energy-storage travelling wave tube such as inductance and electric capacity, electricity
Electric spark caused by sense open circuit and capacitance short-circuit would be possible to ignite inflammable, explosion hazard gases or material, in these environment
The person and equipment constitute a serious threat.Safety spark experimental rig is for being used in explosive atmosphere with electricity
The intrinsic safe explosion-proof equipment of resistance, inductance, electric capacity or hybrid circuit carries out a kind of device of Huo Hua Shi test.The electrode one of inductance groove is oblique
Face copper wheel, by the minitype motor driving of 2r/min its horizontal rotation, another extremely 12 zinc-plated copper wires, by the reversible of 30r/min
Motor drives its vertical rotary, two electrodes constantly to separate, and often separates once, just produces a spark.Explosive intrinsic safety evaluation
That intrinsic safety product is detected one by one using explosibility test under specific experimental condition using safety spark experimental rig, its into
This height, cycle are long, and are unable to the design and manufacture of guide product.Non-explosivity intrinsic safety evaluation is to be based on energy equivalence Principle, according to
Light curve according to existing inductance and electric capacity are critical, by theory analysis with calculate, realize the judgement of circuit intrinsic safety performance, and its
In it is critical only that the corresponding discharge energy of extraction.The equivalent circuit of artificial capacitor short circuit spark-testing has been studied, and
Inductive circuit causes progress slowly because its discharge process is complicated, although use mathematical modeling on theoretical basis
Mode set up inductance breaking arc electric discharge Mathematical Modeling, but these models mostly set up on the basis of arc discharge time
On, and the arc discharge time is an implicit function related to circuit parameter, therefore there is great limitation in the model set up
Property.
If the detection to the electric discharge of inductance breaking arc can be realized, determine that electric arc sets up moment and arc extinction moment,
Corresponding inductance disjunction electrical discharge arc Resistance model for prediction is set up, the moment is set up in electric arc and is accessed arc resistance, at the arc extinction moment
Arc resistance is removed, the waveform of inductance breaking arc electric discharge is extracted by means of circuit simulating software, you can instead of safety spark
Experimental rig carries out the judgement of intrinsic safety performance to inductive circuit；Further, it is also possible to design inductive circuit safety protection electricity
The moment is set up on road, such as electric arc, at inductance two ends and connects a resistance or voltage limiting device etc., therefore inductance breaking arc is put
The detection of electricity, it is more exact that the detection of inductance breaking arc discharging time is necessary.
The content of the invention
The technical problems to be solved by the invention are for above-mentioned deficiency of the prior art, there is provided a kind of circuit structure
Simply, it is reasonable in design, realize convenient and low cost, it is stable and reliable in work, can fast and effectively detect that inductance disconnects electric arc and rises
Only moment, applied widely, the practical, inductance with good application value disconnect electric arc start/stop time detection electricity
Road.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of inductance disconnects the inspection of electric arc start/stop time
Slowdown monitoring circuit, it is characterised in that：Delay circuit including the voltage signal processing circuit that is sequentially connected, split-phase and compare output circuit；
The voltage signal processing circuit includes instrumentation amplifier U1, resistance R1, resistance R2, resistance R3 and resistance R4, institute
The one end for stating resistance R1 is the sample point cathode voltage input VIN+ of voltage signal processing circuit, and one end of the resistance R3 is
The sample point cathode voltage input VIN- of voltage signal processing circuit, resistance R1 and electricity that sample point cathode voltage passes through series connection
The resistor voltage divider network that resistance R2 is constituted is connected to ground, the connection end of the resistance R1 and resistance R2 and the same phase of instrumentation amplifier U1
Input is connected, and sample point cathode voltage is connected to ground by the resistor voltage divider network that the resistance R3 and resistance R4 that connect are constituted,
The connection end of the resistance R3 and resistance R4 is connected with the inverting input of instrumentation amplifier U1；
The split-phase delay circuit include electric capacity C1, the first proportion resistor network being made up of resistance R5 and resistance R7, with
And the second proportion resistor network being made up of resistance R6 and resistance R8；The resistance of the resistance R5, the resistance of resistance R6, resistance R7
Resistance and the resistance of resistance R8 meet relational expressionOne end of the resistance R5 and instrumentation amplifier U1
Output end connection, the other end of the resistance R5 is grounded by resistance R7, one end of the resistance R6 and instrumentation amplifier U1
Output end connection, the other end of the resistance R6 is grounded by resistance R8, one end of the electric capacity C1 and resistance R6 and resistance
The connection end connection of R8, the other end ground connection of the electric capacity C1；
The output circuit that compares includes comparator U2, d type flip flop U3 and resistance R10, and the comparator U2's is same mutually defeated
Enter end to be connected with the connection end of resistance R5 and resistance R7, the inverting input of the comparator U2 and the company of resistance R6 and resistance R8
End connection is connect, the output end of the comparator U2 is connected by resistance R10 with the output end VCC of externally fed power supply, and the D is touched
The signal input part D and signal output part of hair device U3Connection, the clock signal input terminal CP and comparator of the d type flip flop U3
U2 output ends are connected, and the signal output part Q of the d type flip flop U3 is the output end OUT for comparing output circuit.
Above-mentioned inductance disconnects electric arc start/stop time detection circuit, it is characterised in that：The model of the instrumentation amplifier U1
It is AD623.
Above-mentioned inductance disconnects electric arc start/stop time detection circuit, it is characterised in that：The model of the comparator U2
LM2903。
Above-mentioned inductance disconnects electric arc start/stop time detection circuit, it is characterised in that：The model of the d type flip flop U3
74HC75。
Present invention also offers a kind of method and step it is simple, reasonable in design, realize it is convenient, can fast and effectively detect electricity
The inductance that sense disconnects electric arc start/stop time disconnects electric arc start/stop time detection method, it is characterised in that the method includes following step
Suddenly：
Step one, detection circuit connection：Detection inductance will be needed to disconnect the sample point of the inductive circuit of electric arc start/stop time
Positive pole is connected with the sample point cathode voltage input VIN+ of voltage signal processing circuit, it would be desirable to detect that inductance disconnects electric arc and rises
Only the sample point negative pole of the inductive circuit at moment is connected with the sample point cathode voltage input VIN- of voltage signal processing circuit；
And safety spark experimental rig G is connected on need detect inductance disconnect electric arc start/stop time inductive circuit sample point positive pole with
Between negative pole；
Step 2, voltage signal treatment：Need detect inductance disconnect electric arc start/stop time the inductive circuit course of work in,
The sample point positive pole and negative electricity of inductive circuit of the voltage signal processing circuit to needing to detect inductance disconnection electric arc start/stop time
After the double-width grinding differential signal of pressure is amplified treatment, it is converted into single-ended voltage signal and exports to delay circuit to split-phase；
Step 3, inductance disconnect the detection of electric arc start/stop time, and detailed process is：
When two electrodes of safety spark experimental rig G are in closure state, it is necessary to detect that inductance disconnects electric arc start-stop
The inductive circuit normal work at moment, at this time, it may be necessary to detect that the inductance that inductance is disconnected in the inductive circuit of electric arc start/stop time fills
Electric energy storage, it is necessary to detect that inductance disconnects the sampling of the inductive circuit of electric arc start/stop time when inductive current reaches maximum
Voltage between point positive pole and sample point negative pole is zero, and the output voltage of instrumentation amplifier U1 is also in voltage signal processing circuit
Zero；The voltage of voltage signal processing circuit output is divided into two-way, delays the first ratio electricity in circuit by the split-phase all the way
The in-phase input end for comparing comparator U2 in output circuit is exported after resistance network partial pressure, another road delays electricity by the split-phase
The inverting input for comparing comparator U2 in output circuit is exported after the second proportion resistor network partial pressure in road, due to resistance
The resistance of the resistance of R5, the resistance of resistance R6, the resistance of resistance R7 and resistance R8 meets relational expressionCause
The voltage of the in-phase input end of this comparator U2 is less than the voltage of its inverting input, comparator U2 output low levels so that D is touched
Hair device U3 is in latch mode, and d type flip flop U3 does not detect the voltage signal of change, exports low level；
When explosibility test is opened and closed using safety spark experimental rig G, two electricity of safety spark experimental rig G
Pole is initially separated by closing, due to needing the loop current for detecting the inductive circuit that inductance disconnects electric arc start/stop time to dash forward
Become, cause breakpoint that voltage jump occurs, it is necessary to detect that the inductive circuit of inductance disconnection electric arc start/stop time starts to produce electric arc
Electric discharge；The voltage of voltage signal processing circuit output is divided into two-way, delays the first ratio in circuit by the split-phase all the way
The in-phase input end for comparing comparator U2 in output circuit is exported after resistor network partial pressure, another road delays by the split-phase
The inverting input for comparing comparator U2 in output circuit is exported after the second proportion resistor network partial pressure in circuit, although electricity
The resistance for hindering resistance, the resistance of resistance R6, the resistance of resistance R7 and the resistance R8 of R5 meets relational expression
But because electric capacity C1 has delayed the change of voltage that exports after the second proportion resistor network partial pressure so that comparator U2's is same
More than the voltage of its inverting input, comparator U2 exports high level to the voltage of phase input, because d type flip flop U3 is rising edge
Triggering, therefore, d type flip flop U3 output high level；The moment that d type flip flop U3 starts to export high level is recorded as inductance disconnection electricity
Arc initial time；
Propulsion over time, the degree of two electrode separations of safety spark experimental rig G gradually increases, arc current
Approximately linear is decayed, and now the arc voltage at disjunction slowly rises, and the voltage of voltage signal processing circuit output is divided into two-way,
All the way by exported after the first proportion resistor network partial pressure during the split-phase delays circuit compare output circuit in comparator
The in-phase input end of U2, another road is by output after the second proportion resistor network partial pressure during the split-phase delays circuit to comparing
The inverting input of comparator U2 in output circuit, due to the resistance of resistance R5, the resistance of resistance R6, the resistance of resistance R7 and electricity
The resistance for hindering R8 meets relational expressionTherefore the voltage of the in-phase input end of comparator U2 is anti-phase less than its
The voltage of input, comparator U2 outputs maintain low level, and d type flip flop U3 outputs keep high level；
As two electrode distances of safety spark experimental rig G are further increased, arc current drops to suddenly zero, this
When, two electrodes of safety spark experimental rig G are completely separated, it is necessary to detect that inductance disconnects the inductive circuit of electric arc start/stop time
A voltage signal for mutation is generated again, and the voltage of voltage signal processing circuit output is divided into two-way, all the way by described
Split-phase exports the homophase input for comparing comparator U2 in output circuit after delaying the first proportion resistor network partial pressure in circuit
End, another road by exported after the second proportion resistor network partial pressure during the split-phase delays circuit compare output circuit in compare
Compared with the inverting input of device U2, although the resistance of the resistance of resistance R5, the resistance of resistance R6, the resistance of resistance R7 and resistance R8 expires
Sufficient relational expressionBut delay the electricity of output after the second proportion resistor network partial pressure due to electric capacity C1
The change of pressure so that comparator U2 exports high level again, d type flip flop U3 detects the voltage letter that this changes from low to high
Number, the upset of output state logic is low level, it is necessary to detect that inductance disconnects the inductive circuit arc discharge knot of electric arc start/stop time
Beam；Produce the moment of trailing edge to be recorded as inductance the output logic state upset of d type flip flop U3 and disconnect electric arc end time.
The present invention has advantages below compared with prior art：
1st, the circuit structure of inductance disconnection electric arc start/stop time detection circuit of the present invention is simple, and reasonable in design, it is convenient to realize
And low cost, it is stable and reliable in work.
2nd, inductance of the invention disconnects electric arc start/stop time detection circuit, can accurately detect that inductance disconnects electric arc and rises
Begin moment and end time, is that other design institutes are inaccessiable.
3rd, inductance of the invention disconnects electric arc start/stop time detection circuit, and it is right to be realized by the instrumentation amplifier selected
In inductive circuit between 2 points of any disjunction voltage sampling, and to sampled circuit itself interference it is smaller.
4th, inductance of the invention disconnects electric arc start/stop time detection circuit, the instrumentation amplifier of selection, comparator and D triggerings
Device response speed is very fast, can detect voltage jump situation more than microsecond rank, can in real time detect that inductance disconnects
Electric arc start/stop time, real-time detection effect is obvious.
5th, inductance of the invention disconnects electric arc start/stop time detection circuit, can be applied to various inductive circuit breaking arcs
In discharge test, it is engaged with safety spark experimental rig, preferably the process of simulaed inductance breaking arc electric discharge, is simulated
The experiment of inductance breaking arc discharge process and actual spark is closer to, particularly the error of inductance breaking arc discharge energy compared with
It is small, by means of simulation software, inductance breaking arc discharge waveform can be quickly and easily extracted, inductive circuit is carried out non-quick-fried
Fried property intrinsic safety judges that strong support can be provided, and its is applied widely.
6th, the method and step of inductance disconnection electric arc start/stop time detection method of the invention is simple, reasonable in design, realization side
Just, can fast and effectively detect that inductance disconnects electric arc start/stop time.
7th, it is of the invention practical, with good application value.
In sum, circuit structure of the present invention is simple, reasonable in design, realizes convenient and low cost, stable and reliable in work, energy
Enough fast and effectively detection inductance disconnect electric arc start/stop time, applied widely, practical, with good popularization and application valency
Value.
Below by drawings and Examples, technical scheme is described in further detail.
Brief description of the drawings
Fig. 1 is that inductance of the present invention disconnects the schematic block circuit diagram that electric arc start/stop time detects circuit.
Fig. 2 is that inductance of the present invention disconnects the circuit theory diagrams that electric arc start/stop time detects circuit.
Fig. 3 is the method flow block diagram that inductance of the present invention disconnects electric arc start/stop time detection method.
Fig. 4 is the exemplary application map that inductance of the present invention disconnects electric arc start/stop time detection circuit and method.Reference is said
It is bright:
1-inductive circuit；2-voltage signal processing circuit；3-split-phase delays circuit；
4-compare output circuit.
Specific embodiment
As shown in figure 1, inductance of the invention disconnects electric arc start/stop time detection circuit, including the voltage signal being sequentially connected
Process circuit 2, split-phase delays circuit 3 and compares output circuit 4；
As shown in Fig. 2 the voltage signal processing circuit 2 includes instrumentation amplifier U1, resistance R1, resistance R2, resistance R3
With resistance R4, one end of the resistance R1 is the sample point cathode voltage input VIN+ of voltage signal processing circuit 2, the electricity
The one end for hindering R3 is the sample point cathode voltage input VIN- of voltage signal processing circuit 2, and sample point cathode voltage is by string
The resistor voltage divider network that the resistance R1 and resistance R2 of connection are constituted is connected to ground, and connection end and the instrument of the resistance R1 and resistance R2 are used
The in-phase input end connection of amplifier U1, the divider resistance that sample point cathode voltage is made up of the resistance R3 and resistance R4 that connect
To ground, the connection end of the resistance R3 and resistance R4 is connected network connection with the inverting input of instrumentation amplifier U1；
As shown in Fig. 2 the split-phase delay circuit 3 include electric capacity C1, the first ratio being made up of resistance R5 and resistance R7
Resistor network, and the second proportion resistor network being made up of resistance R6 and resistance R8；The resistance of the resistance R5, resistance R6
The resistance of resistance, the resistance of resistance R7 and resistance R8 meets relational expressionOne end of the resistance R5 with
The output end connection of instrumentation amplifier U1, the other end of the resistance R5 is grounded by resistance R7, one end of the resistance R6 and
The output end connection of instrumentation amplifier U1, the other end of the resistance R6 is grounded by resistance R8, one end of the electric capacity C1 and
The connection end connection of resistance R6 and resistance R8, the other end ground connection of the electric capacity C1；
As shown in Fig. 2 the output circuit 4 that compares includes comparator U2, d type flip flop U3 and resistance R10, the comparator
The in-phase input end of U2 is connected with the connection end of resistance R5 and resistance R7, the inverting input of the comparator U2 and resistance R6 and
The connection end connection of resistance R8, the output end of the comparator U2 is connected by resistance R10 with the output end VCC of externally fed power supply
Connect, the signal input part D and signal output part of the d type flip flop U3Connection, the clock signal input terminal of the d type flip flop U3
CP is connected with comparator U2 output ends, and the signal output part Q of the d type flip flop U3 is the output end for comparing output circuit 4
OUT。
During specific implementation, the power end of the instrumentation amplifier U1 is connected with the output end VCC of externally fed power supply, described
The earth terminal ground connection of instrumentation amplifier U1；The power end of the comparator U2 is connected with the output end VCC of externally fed power supply, institute
State the earth terminal ground connection of comparator U2.The voltage of the output end VCC outputs of the externally fed power supply is 5V.
In the present embodiment, the model AD623 of the instrumentation amplifier U1.
In the present embodiment, the model LM2903 of the comparator U2.
In the present embodiment, the model 74HC75 of the d type flip flop U3.
As shown in figure 3, inductance of the invention disconnects electric arc start/stop time detection method, comprise the following steps：
Step one, detection circuit connection：Detection inductance will be needed to disconnect the sample point of the inductive circuit 1 of electric arc start/stop time
Positive pole is connected with the sample point cathode voltage input VIN+ of voltage signal processing circuit 2, it would be desirable to detect that inductance disconnects electric arc
The sample point negative pole of the inductive circuit 1 of start/stop time and the sample point cathode voltage input VIN- of voltage signal processing circuit 2
Connection；And safety spark experimental rig G is connected on the sample point of the inductive circuit 1 for needing to detect inductance disconnection electric arc start/stop time
Between positive pole and negative pole；
Step 2, voltage signal treatment：Need to detect the course of work of inductive circuit 1 that inductance disconnects electric arc start/stop time
In, voltage signal processing circuit 2 pairs needs to detect the sample point positive pole of the inductive circuit 1 that inductance disconnects electric arc start/stop time and bear
After the double-width grinding differential signal of pole tension is amplified treatment, it is converted into single-ended voltage signal and exports to delay circuit 3 to split-phase；
Step 3, inductance disconnect the detection of electric arc start/stop time, and detailed process is：
When two electrodes of safety spark experimental rig G are in closure state, it is necessary to detect that inductance disconnects electric arc start-stop
The normal work of inductive circuit 1 at moment, at this time, it may be necessary to detect inductance disconnect electric arc start/stop time inductive circuit 1 in inductance
Charging energy-storing, it is necessary to detect that inductance disconnects taking for the inductive circuit 1 of electric arc start/stop time when inductive current reaches maximum
Voltage between sampling point positive pole and sample point negative pole is zero, the output voltage of instrumentation amplifier U1 in voltage signal processing circuit 2
Also it is zero；The voltage of the output of voltage signal processing circuit 2 is divided into two-way, delays first in circuit 3 by the split-phase all the way
The in-phase input end for comparing comparator U2 in output circuit 4 is exported after proportion resistor network partial pressure, another road is by described point
The anti-phase input for comparing comparator U2 in output circuit 4 is exported after mutually delaying the second proportion resistor network partial pressure in circuit 3
End, because the resistance of the resistance of resistance R5, the resistance of resistance R6, the resistance of resistance R7 and resistance R8 meets relational expressionTherefore the voltage of the in-phase input end of comparator U2 is less than the voltage of its inverting input, comparator
U2 exports low level so that d type flip flop U3 is in latch mode, and d type flip flop U3 does not detect the voltage signal of change, exports
Low level；
When explosibility test is opened and closed using safety spark experimental rig G, two electricity of safety spark experimental rig G
Pole is initially separated by closing, due to needing the loop current for detecting the inductive circuit 1 that inductance disconnects electric arc start/stop time to dash forward
Become, cause breakpoint that voltage jump occurs, it is necessary to detect that the inductive circuit 1 of inductance disconnection electric arc start/stop time starts to produce electric arc
Electric discharge；The voltage of the output of voltage signal processing circuit 2 is divided into two-way, delays the first ratio in circuit 3 by the split-phase all the way
The in-phase input end for comparing comparator U2 in output circuit 4 is exported after example resistor network partial pressure, another road is by the split-phase
The inverting input for comparing comparator U2 in output circuit 4 is exported after delaying the second proportion resistor network partial pressure in circuit 3,
Although the resistance of the resistance of resistance R5, the resistance of resistance R6, the resistance of resistance R7 and resistance R8 meets relational expressionBut because electric capacity C1 has delayed the change of voltage that exports after the second proportion resistor network partial pressure
Change so that the voltage of the in-phase input end of comparator U2 is more than the voltage of its inverting input, comparator U2 exports high level, by
In d type flip flop U3 for rising edge is triggered, therefore, d type flip flop U3 output high level；D type flip flop U3 is started to export high level
Moment is recorded as inductance and disconnects electric arc initial time；
Propulsion over time, the degree of two electrode separations of safety spark experimental rig G gradually increases, arc current
Approximately linear is decayed, and now the arc voltage at disjunction slowly rises, and the voltage of the output of voltage signal processing circuit 2 is divided into two
Road, exports after the split-phase delays the first proportion resistor network partial pressure in circuit 3 compare in comparing output circuit 4 all the way
Compared with the in-phase input end of device U2, another road exports after the split-phase delays the second proportion resistor network partial pressure in circuit 3
To the inverting input for comparing comparator U2 in output circuit 4, due to the resistance of resistance R5, the resistance of resistance R6, resistance R7
The resistance of resistance and resistance R8 meets relational expressionTherefore the voltage of the in-phase input end of comparator U2 is small
In the voltage of its inverting input, comparator U2 outputs maintain low level, and d type flip flop U3 outputs keep high level；
As two electrode distances of safety spark experimental rig G are further increased, arc current drops to suddenly zero, this
When, two electrodes of safety spark experimental rig G are completely separated, it is necessary to detect that inductance disconnects the inductive circuit of electric arc start/stop time
1 generates a voltage signal for mutation again, and the voltage of the output of voltage signal processing circuit 2 is divided into two-way, all the way by institute
The same phase for comparing comparator U2 in output circuit 4 is exported after stating the first proportion resistor network partial pressure during split-phase delays circuit 3
Input, another road exports electric to output is compared after the split-phase delays the second proportion resistor network partial pressure in circuit 3
The inverting input of comparator U2 in road 4, although the resistance of resistance R5, the resistance of resistance R6, the resistance of resistance R7 and resistance R8
Resistance meet relational expressionBut after having delayed the second proportion resistor network partial pressure due to electric capacity C1
The change of the voltage of output so that comparator U2 exports high level again, d type flip flop U3 detects what this changed from low to high
Voltage signal, output state logic upset is low level, it is necessary to detect that inductance disconnects the electric arc of inductive circuit 1 of electric arc start/stop time
Electric discharge terminates；Produce the moment of trailing edge to be recorded as inductance the output logic state upset of d type flip flop U3 and disconnect electric arc termination
Moment.
For example, as shown in Figure 4, it is necessary to detect inductance disconnect electric arc start/stop time inductive circuit 1 by direct voltage source Vi,
Inductance L and current-limiting resistance RL concatenations are constituted, and one end of the inductance L is connected with direct voltage source Vi cathode output ends, the electricity
The other end for feeling L is the sample point positive pole of inductive circuit 1, and one end and the direct voltage source Vi negative poles of the current-limiting resistance RL are exported
End connection and ground connection, the other end of the current-limiting resistance RL is the sample point negative pole of inductive circuit 1.
When two electrodes of safety spark experimental rig G are in closure state, it is necessary to detect that inductance disconnects electric arc start-stop
The normal work of inductive circuit 1 at moment, now, inductance L1 charging energy-storings, comparator U2 output low levels so that d type flip flop U3
In latch mode, d type flip flop U3 does not detect the voltage signal of change, exports low level；
When explosibility test is opened and closed using safety spark experimental rig G, two electricity of safety spark experimental rig G
Pole by close be initially separated, it is necessary to detect inductance disconnect electric arc start/stop time inductive circuit 1 in resistance increase suddenly, due to
Needing the loop current for detecting the inductive circuit that inductance disconnects electric arc start/stop time can not be mutated, and cause breakpoint that voltage occurs and dash forward
Become, it is necessary to detect that the inductive circuit 1 of inductance disconnection electric arc start/stop time starts to produce arc discharge；Comparator U2 outputs electricity high
Flat, d type flip flop U3 detects the voltage signal of change, exports high level；By d type flip flop U3 start export high level when engrave
Record as inductance disconnects electric arc initial time；
Propulsion over time, the degree of two electrode separations of safety spark experimental rig G gradually increases, arc current
Approximately linear is decayed, and now the arc voltage at disjunction slowly rises, and comparator U2 outputs maintain low level, and d type flip flop U3 is defeated
Go out to keep high level；
As two electrode distances of safety spark experimental rig G are further increased, arc current drops to suddenly zero, this
When, two electrodes of safety spark experimental rig G are completely separated, it is necessary to detect that inductance disconnects the inductive circuit of electric arc start/stop time
1 generates a voltage signal for mutation again, and comparator U2 exports high level again, and d type flip flop U3 detects this from low
To the voltage signal of High variation, the upset of output state logic is low level, it is necessary to detect that inductance disconnects the electricity of electric arc start/stop time
The arc discharge of inductive circuit 1 terminates；Produce the moment of trailing edge to be recorded as inductance the output logic state upset of d type flip flop U3 to break
Open electric arc end time.
The above, is only presently preferred embodiments of the present invention, and not the present invention is imposed any restrictions, every according to the present invention
Any simple modification, change and equivalent structure change that technical spirit is made to above example, still fall within skill of the present invention
In the protection domain of art scheme.
Claims (5)
1. a kind of inductance disconnects electric arc start/stop time detection circuit, it is characterised in that：Including the voltage signal treatment being sequentially connected
Circuit (2), split-phase delay circuit (3) and compare output circuit (4)；
The voltage signal processing circuit (2) includes instrumentation amplifier U1, resistance R1, resistance R2, resistance R3 and resistance R4, described
One end of resistance R1 is the sample point cathode voltage input VIN+ of voltage signal processing circuit (2), one end of the resistance R3
It is the sample point cathode voltage input VIN- of voltage signal processing circuit (2), the resistance that sample point cathode voltage passes through series connection
The resistor voltage divider network that R1 and resistance R2 is constituted is connected to ground, connection end and the instrumentation amplifier U1 of the resistance R1 and resistance R2
In-phase input end connection, sample point cathode voltage by connect resistance R3 and resistance R4 constitute resistor voltage divider network connect
To ground, the connection end of the resistance R3 and resistance R4 is connected with the inverting input of instrumentation amplifier U1；
The split-phase delays the circuit (3) to include electric capacity C1, the first proportion resistor network being made up of resistance R5 and resistance R7, and
The second proportion resistor network being made up of resistance R6 and resistance R8；The resistance of the resistance R5, the resistance of resistance R6, resistance R7
The resistance of resistance and resistance R8 meets relational expressionOne end of the resistance R5 is with instrumentation amplifier U1's
Output end is connected, and the other end of the resistance R5 is grounded by resistance R7, and one end of the resistance R6 is with instrumentation amplifier U1's
Output end is connected, and the other end of the resistance R6 is grounded by resistance R8, one end and the resistance R6 and resistance R8 of the electric capacity C1
Connection end connection, the electric capacity C1 the other end ground connection；
The output circuit (4) that compares includes comparator U2, d type flip flop U3 and resistance R10, the homophase input of the comparator U2
End is connected with the connection end of resistance R5 and resistance R7, the inverting input of the comparator U2 and the connection of resistance R6 and resistance R8
End connection, the output end of the comparator U2 is connected by resistance R10 with the output end VCC of externally fed power supply, the D triggerings
The signal input part D and signal output part of device U3Connection, the clock signal input terminal CP and comparator U2 of the d type flip flop U3
Output end is connected, and the signal output part Q of the d type flip flop U3 is the output end OUT for comparing output circuit (4).
2. electric arc start/stop time detection circuit is disconnected according to the inductance described in claim 1, it is characterised in that：The instrument amplifies
The model AD623 of device U1.
3. electric arc start/stop time detection circuit is disconnected according to the inductance described in claim 1, it is characterised in that：The comparator U2
Model LM2903.
4. electric arc start/stop time detection circuit is disconnected according to the inductance described in claim 1, it is characterised in that：The d type flip flop
The model 74HC75 of U3.
5. it is a kind of to carry out the method that inductance disconnects the detection of electric arc start/stop time using detection circuit as claimed in claim 1, its
It is characterised by, the method is comprised the following steps：
Step one, detection circuit connection：The sample point of inductive circuit (1) of detection inductance disconnection electric arc start/stop time will be needed just
Pole is connected with the sample point cathode voltage input VIN+ of voltage signal processing circuit (2), it would be desirable to detect that inductance disconnects electric arc
The sample point negative pole of the inductive circuit (1) of start/stop time and the sample point cathode voltage input of voltage signal processing circuit (2)
VIN- is connected；And safety spark experimental rig G is connected on the inductive circuit (1) for needing to detect inductance disconnection electric arc start/stop time
Between sample point positive pole and negative pole；
Step 2, voltage signal treatment：Need detect inductance disconnect electric arc start/stop time inductive circuit (1) course of work in,
Voltage signal processing circuit (2) to need detect inductance disconnect electric arc start/stop time inductive circuit (1) sample point positive pole with
After the double-width grinding differential signal of cathode voltage is amplified treatment, it is converted into single-ended voltage signal and exports to delay circuit to split-phase
(3)；
Step 3, inductance disconnect the detection of electric arc start/stop time, and detailed process is：
When two electrodes of safety spark experimental rig G are in closure state, it is necessary to detect that inductance disconnects electric arc start/stop time
Inductive circuit (1) normal work, at this time, it may be necessary to detect inductance disconnect electric arc start/stop time inductive circuit (1) in inductance
Charging energy-storing, it is necessary to detect that inductance disconnects the inductive circuit (1) of electric arc start/stop time when inductive current reaches maximum
Voltage between sample point positive pole and sample point negative pole is zero, the output of instrumentation amplifier U1 in voltage signal processing circuit (2)
Voltage is also zero；The voltage of voltage signal processing circuit (2) output is divided into two-way, delays circuit (3) by the split-phase all the way
In the first proportion resistor network partial pressure after output to the in-phase input end for comparing comparator U2 in output circuit (4), Ling Yilu
Exported after the split-phase delays the second proportion resistor network partial pressure in circuit (3) and compared in comparing output circuit (4)
The inverting input of device U2, because the resistance of the resistance of resistance R5, the resistance of resistance R6, the resistance of resistance R7 and resistance R8 meets
Relational expressionTherefore the voltage of the in-phase input end of comparator U2 is less than the voltage of its inverting input,
Comparator U2 exports low level so that d type flip flop U3 is in latch mode, and d type flip flop U3 does not detect the voltage letter of change
Number, export low level；
When explosibility test is opened and closed using safety spark experimental rig G, two electrodes of safety spark experimental rig G by
Closure is initially separated, due to needing the loop current for detecting the inductive circuit (1) that inductance disconnects electric arc start/stop time to be mutated,
Cause breakpoint that voltage jump occurs, it is necessary to detect that the inductive circuit (1) of inductance disconnection electric arc start/stop time starts to produce electric arc
Electric discharge；The voltage of voltage signal processing circuit (2) output is divided into two-way, delays the in circuit (3) by the split-phase all the way
To the in-phase input end for comparing comparator U2 in output circuit (4), another road is by institute for output after one proportion resistor network partial pressure
Output after the second proportion resistor network partial pressure during split-phase delays circuit (3) is stated to comparing comparator U2 in output circuit (4)
Inverting input, although the resistance of the resistance of resistance R5, the resistance of resistance R6, the resistance of resistance R7 and resistance R8 meets relational expressionBut because electric capacity C1 has delayed the change of voltage that exports after the second proportion resistor network partial pressure
Change so that the voltage of the in-phase input end of comparator U2 is more than the voltage of its inverting input, comparator U2 exports high level, by
In d type flip flop U3 for rising edge is triggered, therefore, d type flip flop U3 output high level；D type flip flop U3 is started to export high level
Moment is recorded as inductance and disconnects electric arc initial time；
Propulsion over time, the degree of two electrode separations of safety spark experimental rig G gradually increases, and arc current is approximate
Linear attenuation, now the arc voltage at disjunction slowly rise, voltage signal processing circuit (2) output voltage be divided into two-way,
Exported in comparing output circuit (4) after the split-phase delays the first proportion resistor network partial pressure in circuit (3) all the way
The in-phase input end of comparator U2, another road is after the split-phase delays the second proportion resistor network partial pressure in circuit (3)
The inverting input for comparing comparator U2 in output circuit (4) is exported, due to resistance, the resistance of resistance R6, the electricity of resistance R5
The resistance of the resistance and resistance R8 that hinder R7 meets relational expressionTherefore the in-phase input end of comparator U2
Voltage is less than the voltage of its inverting input, and comparator U2 outputs maintain low level, and d type flip flop U3 outputs keep high level；
As two electrode distances of safety spark experimental rig G are further increased, arc current drops to suddenly zero, now,
Two electrodes of safety spark experimental rig G are completely separated, it is necessary to detect that inductance disconnects the inductive circuit (1) of electric arc start/stop time
A voltage signal for mutation is generated again, and the voltage of voltage signal processing circuit (2) output is divided into two-way, all the way by institute
Output after the first proportion resistor network partial pressure during split-phase delays circuit (3) is stated to comparing comparator U2 in output circuit (4)
In-phase input end, another road is exported after the split-phase delays the second proportion resistor network partial pressure in circuit (3) to comparing
The inverting input of comparator U2 in output circuit (4), although the resistance of resistance R5, the resistance of resistance R6, the resistance of resistance R7
Resistance with resistance R8 meets relational expressionBut because electric capacity C1 has delayed the second proportion resistor net
The change of the voltage exported after network partial pressure so that comparator U2 exports high level again, d type flip flop U3 detect this from it is low to
The voltage signal of High variation, output state logic upset is low level, it is necessary to detect that inductance disconnects the inductance of electric arc start/stop time
Circuit (1) arc discharge terminates；Produce the moment of trailing edge to be recorded as inductance the output logic state upset of d type flip flop U3 to break
Open electric arc end time.
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