CN206470323U - A kind of inductance disconnects electric arc and set up and finish time detection circuit - Google Patents
A kind of inductance disconnects electric arc and set up and finish time detection circuit Download PDFInfo
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- CN206470323U CN206470323U CN201720193252.XU CN201720193252U CN206470323U CN 206470323 U CN206470323 U CN 206470323U CN 201720193252 U CN201720193252 U CN 201720193252U CN 206470323 U CN206470323 U CN 206470323U
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Abstract
Disconnect electric arc the utility model discloses a kind of inductance and set up and delay circuit with finish time detection circuit, including voltage signal processing circuit, split-phase and compare output circuit；Voltage signal processing circuit includes instrumentation amplifier U1 and voltage-regulator diode D1；Split-phase delays circuit to delay circuit and the second split-phase to delay circuit including the first split-phase, and the first split-phase delays circuit to include electric capacity C1, the first proportion resistor network and the second proportion resistor network；Second split-phase delays circuit to include electric capacity C2, the 3rd proportion resistor network and the 4th proportion resistor network；Comparing output circuit includes comparator U2 and U3, d type flip flop U4, switching diode D2 and D3.The utility model circuit structure is simple, reasonable in design, realizes that convenient and cost is low, it is stable and reliable in work, it can fast and effectively detect that inductive circuit inductance disconnects electric arc electric arc and set up with extinguishing the moment, it is applied widely, it is practical, with good application value.
Description
Technical field
The utility model belongs to inductive circuit inductance and disconnects arc-detection technical field, and in particular to a kind of inductance disconnects electricity
Arc is set up detects circuit with finish time.
Background technology
There is substantial amounts of inflammable, explosion hazard gases or material in the hazardous environments such as colliery, petrochemical industry, 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
Resistance, inductance, the intrinsic safe explosion-proof equipment of electric capacity or hybrid circuit carry out a kind of device of Huo Hua Shi test.The electrode one of inductance groove is oblique
Face copper wheel, by 2r/min minitype motor driving its horizontal rotation, another extremely 12 zinc-plated copper wires, by the reversible of 30r/min
Motor drives its vertical rotary, and two electrodes are constantly separated, and are often separated 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
Curve is lighted according to existing inductance and electric capacity are critical, by theory analysis with calculating, the judgement of circuit intrinsic safety performance is realized, and its
Middle key is to extract corresponding discharge energy.The equivalent circuit of artificial capacitor short circuit spark-testing has been studied, and
Inductive circuit make it that progress is very slow due to its discharge process complexity, although use mathematical modeling on theoretical basis
Mode set up inductance disconnect arc 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 that arc discharge is disconnected to inductance can be realized, determine that electric arc sets up moment and arc extinction moment,
Set up corresponding inductance and disconnect electrical discharge arc Resistance model for prediction, moment access arc resistance is set up in electric arc, at the arc extinction moment
Arc resistance is removed, the waveform that inductance disconnects arc 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 disconnects electric arc to inductance and put
The detection of electricity, it is more exact that the detection that inductance disconnects the arc discharge moment is necessary.
In order to solve problem above, the Chinese patent of Application No. 201611261062.3 discloses a kind of inductance and disconnects electricity
Arc start/stop time detects circuit and method, and its circuit structure is simple, and it is convenient to realize, still, and the inductance that it is detected disconnects electric arc
Start/stop time is the voltage jumped produced twice before and after detecting, but according to the breaking arc flash-over characteristic of small inductor inductive circuit
Curve understands that, when inductance is smaller, breaking arc discharge voltage is rising always, no obvious phenomenon that jumps for the second time, because
This discharges for the breaking arc of small inductor, can not be accurate using the patent circuit and method of Application No. 201611261062.3
Detect that its breaking arc discharges finish time.
Utility model content
Technical problem to be solved in the utility model is that there is provided a kind of inductance for above-mentioned deficiency of the prior art
Disconnect electric arc to set up and finish time detection circuit, its circuit structure is simple, reasonable in design, realizes that convenient and cost is low, works
It is reliable and stable, it can fast and effectively detect that inductive circuit inductance disconnects electric arc electric arc and set up with extinguishing the moment, it is applied widely,
It is practical, with good application value.
In order to solve the above technical problems, the technical solution adopted in the utility model is：A kind of inductance disconnect electric arc set up with
Finish time detects 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, resistance R4, resistance
R17 and voltage-regulator diode D1, the resistance R1 one end are the sample point cathode voltage input of voltage signal processing circuit
VIN-, the resistance R3 one end are the sample point cathode voltage input VIN+ of voltage signal processing circuit, sample point negative pole
Voltage input end VIN- is connected to ground, the resistance R1 and electricity by the resistance R1 and resistance R2 connected the resistor voltage divider networks constituted
Resistance R2 connection end is connected with instrumentation amplifier U1 inverting input, and sample point cathode voltage input VIN+ is by the electricity connected
The resistor voltage divider network that resistance R3 and resistance R4 is constituted is connected to ground, connection end and the instrumentation amplifier of the resistance R3 and resistance R4
Gain setting resistor is connected between U1 in-phase input end connection, two gain resistor connection ends of the instrumentation amplifier U1
RG, the plus earth of the voltage-regulator diode D1, the negative electrode of the voltage-regulator diode D1 and instrumentation amplifier U1 Voltage Reference
End connection, the Voltage Reference end of the instrumentation amplifier U1 is also connected by the output end VCC of resistance R17 and externally fed power supply
Connect；
The split-phase delays circuit to delay circuit and the second split-phase to delay circuit including the first split-phase, and first split-phase is prolonged
Slow circuit is including electric capacity C1, the first proportion resistor network being made up of resistance R5 and resistance R7, and by resistance R6 and resistance R8
Second proportion resistor network of composition；One end of the resistance R5 is connected with instrumentation amplifier U1 output end, the resistance R5
The other end be grounded by resistance R7, one end of the resistance R6 is connected with instrumentation amplifier U1 output end, the resistance R6
The other end be grounded by resistance R8, one end of the electric capacity C1 is connected with resistance R6 and resistance R8 connection end, the electric capacity
C1 other end ground connection；Second split-phase delays circuit to include electric capacity C2, the 3rd ratio being made up of resistance R11 and resistance R13
Example resistor network, and the 4th proportion resistor network being made up of resistance R12 and resistance R14；The resistance of the resistance R11, electricity
The resistance for hindering R12 resistance, resistance R13 resistance and resistance R14 meets relational expressionThe electricity
Resistance R11 one end is connected with instrumentation amplifier U1 output end, and the other end of the resistance R11 is grounded by resistance R13, described
Resistance R12 one end is connected with instrumentation amplifier U1 output end, and the other end of the resistance R12 is grounded by resistance R14, institute
The one end for stating electric capacity C2 is connected with resistance R12 and resistance R14 connection end, the other end ground connection of the electric capacity C2；
The output circuit that compares includes comparator U2, comparator U3, d type flip flop U4, switching diode D2, two poles of switch
Pipe D3, resistance R9, resistance R10, resistance R16 and resistance R15, the comparator U2 in-phase input end and resistance R5 and resistance R7
Connection end connection, the inverting input of the comparator U2 is connected with resistance R6 and resistance R8 connection end, the comparator
U2 output end is connected by resistance R9 with the output end VCC of externally fed power supply；The in-phase input end of the comparator U3 with
Resistance R12 and resistance R14 connection end connection, the inverting input of the comparator U3 and resistance R11 and resistance R13 connection
End connection, the output end of the comparator U3 is connected by resistance R10 with the output end VCC of externally fed power supply；The switch
Diode D2 anode is connected with the output end of the comparator U2, the anode of the switching diode D3 and the comparator U3
Output end connection, the negative electrode of the switching diode D2 and switching diode D3 negative electrode with the d type flip flop U4 when
The CLD connections of clock pin, the clearing pin of the d type flip flop U4Pass through resistance R16 and the output end VCC of externally fed power supply
Connection, and be grounded by electric capacity C3, the power pins Vcc and preset pin of the d type flip flop U4With externally fed electricity
The output end VCC connections in source, the grounding pin GND ground connection of the d type flip flop U4, the signal input part of the d type flip flop U4 draws
Pin D and signal output part pinConnection, the signal output part pin Q of the d type flip flop U4 is the output circuit that compares
The signal output part pin Q that output end OUT, the comparator U2 inverting input pass through the resistance R15 and d type flip flop U4
Connection；The resistance of the resistance R5, resistance R6 resistance, resistance R7 resistance, resistance R8 resistance and resistance R15 resistance expire
Sufficient relational expression
A kind of above-mentioned inductance disconnects electric arc and set up and finish time detection circuit, it is characterised in that：The instrument amplification
Device U1 model AD623.
A kind of above-mentioned inductance disconnects electric arc and set up and finish time detection circuit, it is characterised in that：The comparator U2
Model with comparator U3 is LM2903.
A kind of above-mentioned inductance disconnects electric arc and set up and finish time detection circuit, it is characterised in that：The d type flip flop U4
Model DM74S74.
The utility model has advantages below compared with prior art：
1st, circuit structure of the present utility model is simple, reasonable in design, realizes that convenient and cost is low, stable and reliable in work.
2nd, the utility model can accurately detect that inductive circuit inductance disconnection electric arc electric arc sets up the moment and electric arc puts out
Go out the moment, be that other design institutes are inaccessiable.
3rd, the utility model by the instrumentation amplifier of selection can realize to 2 points of any disjunction in inductive circuit it
Between voltage sampling, and to sampled circuit itself interference it is smaller.
4th, instrumentation amplifier, comparator and the d type flip flop response speed that the utility model is selected are very fast, can detect
Voltage jump situation more than microsecond rank, when can detect that inductive circuit inductance disconnects the foundation of electric arc electric arc with extinguishing in real time
Carve, real-time Detection results are obvious.
5th, the utility model can be disconnected arc test suitable for various inductive circuit inductance, tested and filled with safety spark
Put and be engaged, preferably simulaed inductance disconnects the process of arc discharge, the inductance simulated disconnects arc discharge process and reality
Spark-testing is closer to, and the error of particularly inductance disconnection arc discharge energy is smaller, by means of simulation software, can facilitate
Rapidly extract inductance and disconnect arc discharge waveform, non-explosivity intrinsic safety is carried out to inductive circuit and judges to provide strong
Support, its is applied widely.
6th, the utility model delays circuit to split-phase and compares output circuit to expand, and adds one and includes two-way
The branch road of proportion resistor network and a comparator composition, can detect the arc-over voltage bust moment, and as sense
Property circuit disconnect arc discharge finish time, due to no matter inductance value size, as long as breaking arc discharge finish time,
Arc-over voltage is bound to produce a bust, so, inductive circuit is used as using the detection arc-over voltage bust moment
Disconnect arc discharge finish time more accurately and reliably, testing result can be made more accurate.
7th, it is of the present utility model practical, with good application value.
In summary, circuit structure of the present utility model is simple, reasonable in design, realizes that convenient and cost is low, working stability
Reliably, it can fast and effectively detect that inductive circuit inductance disconnects electric arc electric arc and set up with extinguishing the moment, it is applied widely, it is practical
Property it is strong, with good application value.
Below by drawings and examples, the technical solution of the utility model is described in further detail.
Brief description of the drawings
Fig. 1 is schematic block circuit diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Fig. 3 is exemplary application map of the present utility model.
Description of reference numerals:
1-inductive circuit；2-voltage signal processing circuit；3-split-phase delays circuit；
4-compare output circuit.
Embodiment
As shown in figure 1, a kind of inductance of the present utility model disconnects, electric arc is set up and finish time detects circuit, including successively
The voltage signal processing circuit 2 of connection, split-phase delay circuit 3 and compare output circuit 4；
As shown in Fig. 2 the voltage signal processing circuit 2 include instrumentation amplifier U1, resistance R1, resistance R2, resistance R3,
Resistance R4, resistance R17 and voltage-regulator diode D1, the resistance R1 one end are the sample point negative pole of voltage signal processing circuit 2
Voltage input end VIN-, the resistance R3 one end are the sample point cathode voltage input VIN+ of voltage signal processing circuit 2,
Sample point cathode voltage input VIN- is connected to ground by the resistance R1 and resistance R2 connected the resistor voltage divider networks constituted, described
Resistance R1 and resistance R2 connection end are connected with instrumentation amplifier U1 inverting input, sample point cathode voltage input VIN+
By the resistance R3 and resistance R4 that the connect resistor voltage divider network constituted be connected to ground, the connection end of the resistance R3 and resistance R4 with
Gain is connected between instrumentation amplifier U1 in-phase input end connection, two gain resistor connection ends of the instrumentation amplifier U1
Regulation resistance RG, the plus earth of the voltage-regulator diode D1, the negative electrode of the voltage-regulator diode D1 is with instrumentation amplifier U1's
Voltage Reference end is connected, and the Voltage Reference end of the instrumentation amplifier U1 also passes through the output of resistance R17 and externally fed power supply
Hold VCC connections；
As shown in Fig. 2 the split-phase delays circuit 3 to delay circuit and the second split-phase to delay circuit including the first split-phase, institute
State the first split-phase and delay circuit including electric capacity C1, the first proportion resistor network being made up of resistance R5 and resistance R7, and by electricity
Hinder the second proportion resistor network of R6 and resistance R8 compositions；One end of the resistance R5 connects with instrumentation amplifier U1 output end
Connect, the other end of the resistance R5 is grounded by resistance R7, one end of the resistance R6 connects with instrumentation amplifier U1 output end
Connect, the other end of the resistance R6 is grounded by resistance R8, one end of the electric capacity C1 and resistance R6 and resistance R8 connection end
Connection, the other end ground connection of the electric capacity C1；Second split-phase delays circuit to include electric capacity C2, by resistance R11 and resistance R13 groups
Into the 3rd proportion resistor network, and the 4th proportion resistor network being made up of resistance R12 and resistance R14；The resistance R11's
Resistance, resistance R12 resistance, resistance R13 resistance and resistance R14 resistance meet relational expression
One end of the resistance R11 is connected with instrumentation amplifier U1 output end, and the other end of the resistance R11 is connect by resistance R13
Ground, one end of the resistance R12 is connected with instrumentation amplifier U1 output end, and the other end of the resistance R12 passes through resistance R14
Ground connection, one end of the electric capacity C2 is connected with resistance R12 and resistance R14 connection end, the other end ground connection of the electric capacity C2；
As shown in Fig. 2 the output circuit 4 that compares includes comparator U2, comparator U3, d type flip flop U4, switching diode
D2, switching diode D3, resistance R9, resistance R10, resistance R16 and resistance R15, the comparator U2 in-phase input end and electricity
R5 and resistance R7 connection end connection is hindered, the inverting input of the comparator U2 connects with resistance R6 and resistance R8 connection end
Connect, the output end of the comparator U2 is connected by resistance R9 with the output end VCC of externally fed power supply；The comparator U3's
In-phase input end is connected with resistance R12 and resistance R14 connection end, the inverting input of the comparator U3 and resistance R11 and
Resistance R13 connection end connection, the output end of the comparator U3 passes through resistance R10 and the output end VCC of externally fed power supply
Connection；The anode of the switching diode D2 is connected with the output end of the comparator U2, the anode of the switching diode D3
Be connected with the output end of the comparator U3, the negative electrode of the switching diode D2 and switching diode D3 negative electrode with it is described
D type flip flop U4 clock pins CLD connections, the clearing pin of the d type flip flop U4Pass through resistance R16 and externally fed electricity
The output end VCC connections in source, and be grounded by electric capacity C3, the power pins Vcc and preset pin of the d type flip flop U4
It is connected with the output end VCC of externally fed power supply, the grounding pin GND ground connection of the d type flip flop U4, the d type flip flop U4's
Signal input part pin D and signal output part pinConnection, the signal output part pin Q of the d type flip flop U4 is the ratio
The letter that inverting input compared with the output end OUT, the comparator U2 of output circuit 4 passes through the resistance R15 and d type flip flop U4
Number output pin Q connections；Resistance, resistance R6 resistance, resistance R7 resistance, resistance R8 resistance and the electricity of the resistance R5
Resistance R15 resistance meets relational expression
When it is implemented, the power end of the instrumentation amplifier U1 is connected with the output end VCC of externally fed power supply, it is described
Instrumentation amplifier U1 earth terminal ground connection；The power end of the comparator U2 is connected with the output end VCC of externally fed power supply, institute
State comparator U2 earth terminal ground connection；The power end of the comparator U3 is connected with the output end VCC of externally fed power supply, described
Comparator U3 earth terminal ground connection.The voltage of the output end VCC outputs of the externally fed power supply is 5V.
In addition, when it is implemented, resistance R16 resistance and electric capacity C3 capacitance should meet R16C3 ＞ R6C1, so that
So that d type flip flop U4 power-on reset time long enough, it is ensured that during d type flip flop U4 electrification resets, externally fed power supply pair
Electric capacity C1 is charged, so that comparator U2 anti-phase inputs terminal voltage is more than in-phase input end, comparator U2 is stable to be exported
For low level.
In the present embodiment, the model AD623 of the instrumentation amplifier U1.
In the present embodiment, the model of the comparator U2 and comparator U3 are LM2903.
In the present embodiment, the model DM74S74 of the d type flip flop U4.
The method that the disconnection electric arc foundation of inductive circuit inductance and finish time detection are carried out using the utility model, including with
Lower step：
Step 1: detection circuit connection：By the sampling of the sample point positive pole of inductive circuit 1 and voltage signal processing circuit 2
Point cathode voltage input VIN+ connections, the sample point of the sample point negative pole and voltage signal processing circuit 2 of inductive circuit 1 is born
The VIN- connections of pole tension input；And by safety spark experimental rig G be connected on the sample point positive pole of inductive circuit 1 and negative pole it
Between；
The inductive circuit 1 is made up of the inductive circuit and current-limiting resistance RL connected, the one of inductance in the inductive circuit
The sample point positive pole for inductive circuit 1 is held, one end that the current-limiting resistance RL is not connected with the inductive circuit is inductive circuit 1
Sample point negative pole.
Step 2: voltage signal is handled：In the course of work of inductive circuit 1, voltage signal processing circuit 2 is to inductive circuit 1
Sample point positive pole and the double-width grinding differential signal of cathode voltage be amplified after processing, be converted into single-ended voltage signal and be divided into
Four tunnels are exported delays circuit 3 to split-phase, and the first via delays the first proportion resistor network point in circuit by first split-phase
The in-phase input end for comparing comparator U2 in output circuit 4 is output to after pressure, the second tunnel delays circuit by first split-phase
In the second proportion resistor network partial pressure after be output to the inverting input for comparing comparator U2 in output circuit 4, the 3rd road warp
Cross second split-phase and delay to be output to after the 3rd proportion resistor network partial pressure in circuit and compare comparator U3 in output circuit 4
Inverting input, the 4th tunnel is output to ratio after second split-phase delays the 4th proportion resistor network partial pressure in circuit
Compared with the in-phase input end of comparator U3 in output circuit 4；
Step 3: inductive circuit inductance disconnects, electric arc is set up and finish time is detected, detailed process is：
When safety spark experimental rig G two electrodes are in closure state, the normal work of inductive circuit 1, now, sense
Property circuit 1 in induction charging energy storage, until inductive current reach maximumWhen, the sample point positive pole of inductive circuit 1 is with taking
Voltage between sampling point negative pole is zero, and instrumentation amplifier U1 output voltage is instrumentation amplifier in voltage signal processing circuit 2
The voltage at U1 Voltage Reference end；Due to the resistance of the resistance R5, resistance R6 resistance, resistance R7 resistance, resistance R8
Resistance and resistance R15 resistance meet relational expressionTherefore the comparator U2
Anti-phase input terminal voltage be more than homophase input terminal voltage, therefore comparator U2 output low level；Due to the resistance of the resistance R11
Value, resistance R12 resistance, resistance R13 resistance and resistance R14 resistance meet relational expressionCause
This comparator U3 anti-phase input terminal voltage is more than homophase input terminal voltage, therefore comparator U3 output low levels；D is triggered
Device U4 clock pins CLD is low level, and it, which is exported, keeps low level；Wherein, VINFor the input voltage of inductive circuit 1, RL is
The resistance of current-limiting resistance RL in inductive circuit 1；
When explosibility test is opened and closed using safety spark experimental rig G, safety spark experimental rig G two electricity
Pole is initially separated by closing, because the loop current of inductive circuit 1 can not be mutated, and causes breakpoint to occur voltage jump, perception
Circuit 1 starts to produce arc discharge, generates the voltage jumped；Although resistance R5 resistance, resistance R6 resistance, resistance R7's
The resistance of resistance, resistance R8 resistance and resistance R15 meets relational expressionBut
Because electric capacity C1 has delayed the change of voltage that is exported after the second proportion resistor network partial pressure so that comparator U2 same phase
The voltage of input is more than the voltage of its inverting input, comparator U2 output high level；Resistance, resistance due to resistance R11
The resistance of R12 resistance, resistance R13 resistance and resistance R14 meets relational expressionTherefore compare
The voltage of device U3 in-phase input end is still less than the voltage of its inverting input, comparator U3 output holding low levels；D is triggered
Device U4 detects the high level of comparator U2 outputs, starts to export high level；At the time of d type flip flop U4 is started into output high level
It is recorded as inductive circuit inductance disconnection electric arc and sets up the moment；Afterwards, the high level of d type flip flop U4 outputs is fed back by resistance R15
To comparator U2 inverting input so that the voltage of comparator U2 inverting input is more than the voltage of its in-phase input end,
Comparator U2 exports low level, and d type flip flop U4 output still maintains high level；
Propulsion over time, the degree of safety spark experimental rig G two electrode separations gradually increases, arc current
Approximately linear is decayed, and now the arc voltage at disjunction slowly rises, due to resistance R5 resistance, resistance R6 resistance, resistance R7
Resistance, resistance R8 resistance and resistance R15 resistance meet relational expression
Therefore the voltage of comparator U2 in-phase input end is less than the voltage of its inverting input, and comparator U2 outputs keep low level；
Because resistance R11 resistance, resistance R12 resistance, resistance R13 resistance and resistance R14 resistance meet relational expressionTherefore the voltage of comparator U3 in-phase input end is less than the voltage of its inverting input, compares
Device U3 outputs keep low level；D type flip flop U4 outputs keep high level；
Further increased with safety spark experimental rig G two electrode distances, arc current drops to zero, peace suddenly
Full spark test apparatus G two electrodes are completely separated, now one bust of generation at the separation of 1 two electrodes of inductive circuit
Voltage signal, although resistance R11 resistance, resistance R12 resistance, resistance R13 resistance and resistance R14 resistance meet relation
FormulaBut because electric capacity C2 has delayed the voltage that is exported after the 4th proportion resistor network partial pressure
Change, therefore comparator U3 in-phase input end voltage be more than its inverting input voltage so that comparator U3 export
High level；D type flip flop U4 detects this high level signal, and the upset of output state logic is low level, and the electric arc of inductive circuit 1 is put
Electricity terminates；Inductive circuit inductance, which is recorded as, at the time of d type flip flop U4 output logic state upset is produced into trailing edge disconnects electricity
Arc finish time.
For example, as shown in figure 3, the inductive circuit 1 is made up of inductive circuit and current-limiting resistance RL, the inductive circuit by
Direct voltage source Vi and inductance the L composition of series connection, one end of the inductance L are connected with direct voltage source Vi cathode output ends, institute
The other end for stating inductance L is the sample point positive pole of inductive circuit 1, one end and the direct voltage source Vi negative poles of the current-limiting resistance RL
Output end is connected and is grounded, and the other end of the current-limiting resistance RL is the sample point negative pole of inductive circuit 1.
When safety spark experimental rig G two electrodes are in closure state, the normal work of inductive circuit 1, now, electricity
Feel L1 charging energy-storings, comparator U2 output low levels, comparator U3 exports low level, and d type flip flop U4 clock pins CLD is low
Level, it, which is exported, keeps low level；
When explosibility test is opened and closed using safety spark experimental rig G, safety spark experimental rig G two electricity
Pole is initially separated by closing, because the loop current of inductive circuit can not be mutated, and causes breakpoint to occur voltage jump, perception electricity
Road 1 starts to produce arc discharge, generates the voltage jumped；Comparator U2 exports high level, and d type flip flop U4 detects comparator
The high level of U2 outputs, starts to export high level, and inductive circuit electricity is recorded as at the time of d type flip flop U4 is started into output high level
Sense disconnects electric arc and sets up the moment；Afterwards, the high level of d type flip flop U4 outputs feeds back to the anti-phase of comparator U2 by resistance R15
Input so that the voltage of comparator U2 inverting input is more than the voltage of its in-phase input end, comparator U2 exports low electricity
Flat, d type flip flop U4 output still maintains high level；
Propulsion over time, the degree of safety spark experimental rig G two electrode separations gradually increases, arc current
Approximately linear is decayed, and now the arc voltage at disjunction slowly rises, and comparator U2 outputs keep low level, comparator U3 outputs
Low level is kept, d type flip flop U4 outputs keep high level；
Further increased with safety spark experimental rig G two electrode distances, arc current drops to zero suddenly, this
When inductive circuit 1 two electrodes separation at produce the voltage signal of a bust, therefore comparator U3 in-phase input end
Voltage is more than the voltage of its inverting input so that comparator U3 exports high level, and d type flip flop U4 detects this high level letter
Number, the upset of output state logic is low level, and the arc discharge of inductive circuit 1 terminates；D type flip flop U4 output logic state is turned over
Change the line of production raw trailing edge at the time of be recorded as inductive circuit inductance disconnect the arc ending moment.
It is described above, only it is preferred embodiment of the present utility model, not the utility model is imposed any restrictions, every
Any simple modification, change and the equivalent structure change made according to the utility model technical spirit to above example, still
Belong in the protection domain of technical solutions of the utility model.
Claims (4)
- Set up and finish time detection circuit 1. a kind of inductance disconnects electric arc, it is characterised in that：Including the voltage letter being sequentially connected Number process 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, resistance R4, resistance R17 and voltage-regulator diode D1, the resistance R1 one end are the sample point cathode voltage input of voltage signal processing circuit (2) VIN-, the resistance R3 one end are the sample point cathode voltage input VIN+ of voltage signal processing circuit (2), and sample point is born Pole tension input VIN- by the resistance R1 and resistance R2 connected the resistor voltage divider networks constituted be connected to ground, the resistance R1 and Resistance R2 connection end is connected with instrumentation amplifier U1 inverting input, and sample point cathode voltage input VIN+ is by connecting The resistor voltage divider network that resistance R3 and resistance R4 is constituted is connected to ground, and connection end and the instrument of the resistance R3 and resistance R4 amplify Gain setting resistor is connected between device U1 in-phase input end connection, two gain resistor connection ends of the instrumentation amplifier U1 RG, the plus earth of the voltage-regulator diode D1, the negative electrode of the voltage-regulator diode D1 and instrumentation amplifier U1 Voltage Reference End connection, the Voltage Reference end of the instrumentation amplifier U1 is also connected by the output end VCC of resistance R17 and externally fed power supply Connect；The split-phase delays circuit (3) to delay circuit and the second split-phase to delay circuit including the first split-phase, and first split-phase is prolonged Slow circuit is including electric capacity C1, the first proportion resistor network being made up of resistance R5 and resistance R7, and by resistance R6 and resistance R8 Second proportion resistor network of composition；One end of the resistance R5 is connected with instrumentation amplifier U1 output end, the resistance R5 The other end be grounded by resistance R7, one end of the resistance R6 is connected with instrumentation amplifier U1 output end, the resistance R6 The other end be grounded by resistance R8, one end of the electric capacity C1 is connected with resistance R6 and resistance R8 connection end, the electric capacity C1 other end ground connection；Second split-phase delays circuit to include electric capacity C2, the 3rd ratio being made up of resistance R11 and resistance R13 Example resistor network, and the 4th proportion resistor network being made up of resistance R12 and resistance R14；The resistance of the resistance R11, electricity The resistance for hindering R12 resistance, resistance R13 resistance and resistance R14 meets relational expressionThe electricity Resistance R11 one end is connected with instrumentation amplifier U1 output end, and the other end of the resistance R11 is grounded by resistance R13, described Resistance R12 one end is connected with instrumentation amplifier U1 output end, and the other end of the resistance R12 is grounded by resistance R14, institute The one end for stating electric capacity C2 is connected with resistance R12 and resistance R14 connection end, the other end ground connection of the electric capacity C2；The output circuit (4) that compares includes comparator U2, comparator U3, d type flip flop U4, switching diode D2, two poles of switch Pipe D3, resistance R9, resistance R10, resistance R16 and resistance R15, the comparator U2 in-phase input end and resistance R5 and resistance R7 Connection end connection, the inverting input of the comparator U2 is connected with resistance R6 and resistance R8 connection end, the comparator U2 output end is connected by resistance R9 with the output end VCC of externally fed power supply；The in-phase input end of the comparator U3 with Resistance R12 and resistance R14 connection end connection, the inverting input of the comparator U3 and resistance R11 and resistance R13 connection End connection, the output end of the comparator U3 is connected by resistance R10 with the output end VCC of externally fed power supply；The switch Diode D2 anode is connected with the output end of the comparator U2, the anode of the switching diode D3 and the comparator U3 Output end connection, the negative electrode of the switching diode D2 and switching diode D3 negative electrode with the d type flip flop U4 when The CLD connections of clock pin, the clearing pin of the d type flip flop U4Pass through resistance R16 and the output end VCC of externally fed power supply Connection, and be grounded by electric capacity C3, the power pins Vcc and preset pin of the d type flip flop U4With externally fed electricity The output end VCC connections in source, the grounding pin GND ground connection of the d type flip flop U4, the signal input part of the d type flip flop U4 draws Pin D and signal output part pinConnection, the signal output part pin Q of the d type flip flop U4 compares output circuit (4) to be described Output end OUT, comparator U2 inverting input drawn by resistance R15 and the d type flip flop U4 signal output part Pin Q connections；The resistance of the resistance R5, resistance R6 resistance, resistance R7 resistance, resistance R8 resistance and resistance R15 resistance Value meets relational expression
- 2. disconnecting electric arc according to a kind of inductance described in claim 1 and setting up circuit is detected with finish time, it is characterised in that：Institute State instrumentation amplifier U1 model AD623.
- 3. disconnecting electric arc according to a kind of inductance described in claim 1 and setting up circuit is detected with finish time, it is characterised in that：Institute The model for stating comparator U2 and comparator U3 is LM2903.
- 4. disconnecting electric arc according to a kind of inductance described in claim 1 and setting up circuit is detected with finish time, it is characterised in that：Institute State d type flip flop U4 model DM74S74.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720193252.XU CN206470323U (en) | 2017-03-01 | 2017-03-01 | A kind of inductance disconnects electric arc and set up and finish time detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720193252.XU CN206470323U (en) | 2017-03-01 | 2017-03-01 | A kind of inductance disconnects electric arc and set up and finish time detection circuit |
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| CN206470323U true CN206470323U (en) | 2017-09-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707005A (en) * | 2017-03-01 | 2017-05-24 | 西安科技大学 | Circuit and method for detecting start-stop moment of disconnection arc of inductive circuit |
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2017
- 2017-03-01 CN CN201720193252.XU patent/CN206470323U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707005A (en) * | 2017-03-01 | 2017-05-24 | 西安科技大学 | Circuit and method for detecting start-stop moment of disconnection arc of inductive circuit |
| CN106707005B (en) * | 2017-03-01 | 2019-10-08 | 西安科技大学 | Inductive circuit disconnects electric arc start/stop time detection circuit and method |
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