CN106646199A - Circuit and method for detecting breaking arc discharging time of inductive circuit - Google Patents
Circuit and method for detecting breaking arc discharging time of inductive circuit Download PDFInfo
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- CN106646199A CN106646199A CN201611261074.6A CN201611261074A CN106646199A CN 106646199 A CN106646199 A CN 106646199A CN 201611261074 A CN201611261074 A CN 201611261074A CN 106646199 A CN106646199 A CN 106646199A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
Abstract
The invention discloses a circuit and a method for detecting breaking arc discharging time of an inductive circuit. The circuit comprises a voltage signal processing circuit, a split-phase delay circuit, a comparative output circuit, an arc time testing and displaying driving circuit, and an arc time displaying circuit. The voltage signal processing circuit comprises an instrument-used amplifier U1, and resistors R1, R2, R3 and R4. The split-phase delay circuit comprises resistors R5, R6, R7 and R8, and a capacitor C1. The comparative output circuit comprises a comparator U2, a D trigger U3 and resistors R10, R11 and R12. The method comprises the steps of 1, connecting a detecting circuit, 2, processing a voltage signal and 3, detecting the breaking arc discharging time of the inductive circuit. The circuit and the method have advantages of simple structure, reasonable design, convenient realization, low cost, stable and reliable operation, quick and effective detection for the breaking arc discharging time of the inductive circuit, wide application range, high practicability and high popularization value.
Description
Technical field
The invention belongs to inductive circuit breaking arc discharge time detection technique field, and in particular to a kind of inductive circuit point
Power-off arc discharge time detection circuit and method.
Background technology
Safety spark experimental rig is the basic equipment for studying circuit essential safety performance, according to what is obtained on the apparatus
The various curves of lighting that result of the test is drawn are the foundations for designing intrinsicallysafecircuit.Using safety spark experimental rig test electricity
Inductive circuit, its discharge time is exactly the duration that steady-state value of the circuital current from before disconnection decays to zero when igniting, and it is determined
Material, structure, the concentration of the feature of switch speed and circuit transitional processes and test gas in device electrode, temperature, pressure
Power etc..If discharge time and electrode gap voltage, the mathematical models of curent change rule can be set up, its volt-ampere is set up
Characteristic equation, discharge time is also just readily solved.But at present due to the complexity of actual discharge process, discharge the mechanism ignited still
It is not fully aware of, it is impossible to set up complete theory and carry out quantitative description electric discharge ignition Process, and during the electric discharge of inductive circuit breaking arc
Between be an implicit function related to circuit parameter, it is thus possible to accurately measurement inductive circuit breaking arc discharge time become and ask
The key of topic.
The research method of discharge time is had at present：1. using the method for Mathematical Modeling, by setting up inductance breaking arc
The characteristics of Mathematical Modeling of electric discharge according to current attenuation during inductance disjunction is zero, calculate the electric discharge of inductance breaking arc when
Between；2. computer method measured directly is adopted, its main operational principle is that discharge pulse number is counted using counter
Number, and then discharge period when determining that inductive circuit disconnects.Employing mode method 1., advantage is simple, is easy to calculate.
But after being disconnected due to inductive circuit, actual Current Voltage Changing Pattern is nonlinear, therefore it has certain error.Adopt
With mode method 2., its operation principle is simple, application is convenient, but due to several factors be likely to result in two break sparks it
Between time interval have error so as to cause the deviation of counting.
The content of the invention
The technical problem to be solved is 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 inductive circuit disjunction electricity
When arc discharge time, applied widely, practical, the inductive circuit breaking arc with good application value discharge
Between detect circuit.
To solve above-mentioned technical problem, the technical solution used in the present invention is：When a kind of inductive circuit breaking arc discharges
Between detect circuit, it is characterised in that：Delay circuit, compare output electricity including the voltage signal processing circuit, split-phase being sequentially connected
Road, arc duration test and display driver circuit and arc duration display circuit；
The voltage signal processing circuit includes instrumentation amplifier U1, resistance R1, resistance R2, resistance R3 and resistance R4, institute
The sample point cathode voltage input VIN+ of the one end for voltage signal processing circuit of resistance R1 is stated, 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 homophase of instrumentation amplifier U1
Input connects, and sample point cathode voltage is connected to ground by the resistor voltage divider network that the resistance R3 and resistance R4 of series connection 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 is described including comparator U2, d type flip flop U3, resistance R10, resistance R11 and resistance R12
The in-phase input end of comparator U2 is connected with the connection end of resistance R5 and resistance R7, inverting input and the electricity of the comparator U2
The connection end connection of resistance R6 and resistance R8, the output end of the comparator U2 passes through the output of resistance R10 and externally fed power supply
End VCC connections, the signal input part D and signal output part of the d type flip flop U3Connection, the clock letter of the d type flip flop U3
Number input CP is connected with comparator U2 output ends, the signal output part Q of the d type flip flop U3 through series connection resistance R11 and
Resistance R12 is grounded, and the connection end of the resistance R11 and resistance R12 is output end OUT for comparing output circuit.
Above-mentioned inductive circuit breaking arc discharge time detection circuit, it is characterised in that：Arc duration test and
Display driver circuit is single-chip microcomputer, and the arc duration display circuit is LCDs.
Above-mentioned inductive circuit breaking arc discharge time detection circuit, it is characterised in that：The model of the single-chip microcomputer
STC89C51, model LCD1602 of the LCDs is connected to clock circuit, the clock circuit on the single-chip microcomputer
It is made up of electric capacity C2, electric capacity C3 and crystal oscillator Y1, one end of the crystal oscillator Y1 is connected and public with the 18th pin of the single-chip microcomputer
Electric capacity C2 is grounded, and the other end of the crystal oscillator Y1 is connected with the 19th pin of the single-chip microcomputer and public capacitance C3 is grounded；It is described
29th pin of single-chip microcomputer and the 40th pin are connected with output end VCC1 of externally fed power supply, and the 20th of the single-chip microcomputer draws
Pin is grounded, and the 13rd pin of the single-chip microcomputer is connected with output end OUT for comparing output circuit, the LCDs
6th pin, the 5th pin and the 4th pin the 32nd pin successively with the single-chip microcomputer, the 33rd pin and the 34th pin are connected, institute
The 1st pin and the 16th pin for stating LCDs is grounded, the 2nd pin of the LCDs and the 15th pin with outward
The output end VCC1 connection of portion's power supply, the 3rd pin of the LCDs is grounded by resistance R13.
Above-mentioned inductive circuit breaking arc discharge time detection circuit, it is characterised in that：The instrumentation amplifier U1's
Model AD623.
Above-mentioned inductive circuit breaking arc discharge time detection circuit, it is characterised in that：The model of the comparator U2
For LM2903.
Above-mentioned inductive circuit breaking arc discharge time detection circuit, it is characterised in that：The model of the d type flip flop U3
For 74HC75.
Present invention also offers a kind of method and step is simple, reasonable in design, realization is convenient, can fast and effectively detect electricity
The inductive circuit breaking arc discharge time detection method of inductive circuit breaking arc discharge time, it is characterised in that the method bag
Include following steps：
Step one, detection circuit connection：The sample point positive pole of the inductive circuit for detecting breaking arc discharge time will be needed
It is connected with the sample point cathode voltage input VIN+ of voltage signal processing circuit, it would be desirable to detect breaking arc discharge time
The sample point negative pole of inductive circuit is connected with the sample point cathode voltage input VIN- of voltage signal processing circuit；And will safety
Spark test apparatus G is connected between the sample point positive pole of the inductive circuit for needing to detect breaking arc discharge time and negative pole；
Step 2, voltage signal process：In the course of work of inductive circuit 1, voltage signal processing circuit 2 is to inductive circuit 1
The double-width grinding differential signal of sample point positive pole and cathode voltage be amplified after process, be converted into single-ended voltage signal output
Delay circuit 3 to split-phase；
Step 3, inductive circuit breaking arc discharge time detect that detailed process is：
When two electrodes of safety spark experimental rig G are in closure state, inductive circuit normal work, now, electricity
Induction charging energy storage in inductive circuit, when inductive current reaches maximum, the sample point positive pole of inductive circuit and sample point
Voltage between negative pole is zero, and the output voltage of instrumentation amplifier U1 is also zero in voltage signal processing circuit；At voltage signal
The voltage of the reason output of circuit 2 is divided into two-way, all the way after the split-phase delays the first proportion resistor network partial pressure in circuit 3
The in-phase input end for comparing comparator U2 in output circuit 4 is exported, another road delays second in circuit 3 through the split-phase
Export the inverting input for comparing comparator U2 in output circuit 4 after proportion resistor network partial pressure, due to resistance R5 resistance,
The resistance of the resistance, the resistance of resistance R7 and resistance R8 of resistance R6 meets relational expressionTherefore comparator
The voltage of the in-phase input end of U2 is less than the voltage of its inverting input, comparator U2 output low levels so that at d type flip flop U3
In latch mode, d type flip flop U3 is not detected by the voltage signal for changing, and 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 closure, because the loop current of inductive circuit 1 can not be mutated, causes breakpoint that voltage jump, inductance occur
Circuit 1 starts to produce arc discharge；The voltage of the output of voltage signal processing circuit 2 is divided into two-way, prolongs through the split-phase all the way
The in-phase input end for comparing comparator U2 in output circuit 4 is exported after the first proportion resistor network partial pressure in slow circuit 3, separately
Export to compare after the split-phase delays the second proportion resistor network partial pressure in circuit 3 all the way and compare in output circuit 4
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 meets
Relational expressionBut because electric capacity C1 has delayed the voltage of output after the second proportion resistor network partial pressure
Change so that the voltage of the in-phase input end of comparator U2 more than its inverting input voltage, the high electricity of comparator U2 outputs
It is flat, because d type flip flop U3 is rising edge triggering, therefore, d type flip flop U3 output high level；The high level Jing of d type flip flop U3 outputs
Cross and export after resistance R11 and resistance R12 partial pressures to arc duration test and display driver circuit, when arc duration is tested and is shown
When drive circuit detects high level arrival, start timing；
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 to compare in output circuit 4 and compares after the split-phase delays the first proportion resistor network partial pressure in circuit 3 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 little
In the voltage of its inverting input, comparator U2 outputs maintain low level, d type flip flop U3 outputs 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, and inductive circuit 1 generates again the voltage signal of a mutation,
The voltage of the output of voltage signal processing circuit 2 is divided into two-way, delays the first proportion resistor in circuit 3 through the split-phase all the way
The in-phase input end for comparing comparator U2 in output circuit 4 is exported after network partial pressure, another road delays electricity through the split-phase
The inverting input for comparing comparator U2 in output circuit 4 is exported after the second proportion resistor network partial pressure in road 3, 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 the voltage of output after the second proportion resistor network partial pressure so that comparator U2 is again
Output high level, d type flip flop U3 detects the voltage signal that this changes from low to high, and the upset of output state logic is low electricity
It is flat, need the inductive circuit arc discharge for detecting breaking arc discharge time to terminate；D type flip flop U3 output logic state upsets
When, producing a trailing edge and export to arc duration test and display driver circuit, arc duration is tested and display driver circuit
Stop timing, when the time that timing is obtained is designated as the electric discharge of inductive circuit breaking arc by arc duration test and display driver circuit
Between, and export and shown to arc duration display circuit.
The present invention has compared with prior art advantages below：
1st, the circuit structure of inductive circuit breaking arc discharge time detection circuit of the present invention is simple, reasonable in design, realizes
Convenient and low cost, it is stable and reliable in work.
2nd, inductive circuit breaking arc discharge time of the invention detection circuit, compensate for mathematical model method and computer is straight
The deficiency that mensuration measures inductive circuit breaking arc discharge time is connect, can be directly displayed out in arc duration display circuit
Measurement result, it is convenient to provide to scientific research personnel.
3rd, inductive circuit breaking arc discharge time of the invention detection circuit is discharged according to inductive circuit breaking arc
The detection circuit of the Variation Features design of voltage waveform, the instrumentation amplifier of selection, comparator fast response time, the electricity for measuring
Arc discharge time error is little, high precision.
4th, inductive circuit breaking arc discharge time of the invention detection circuit, not only can be applied to actual spark examination
In the middle of testing, in can be applicable to various inductive circuit breaking arcs electric discharge l-G simulation tests, just can be with by means of simulation software
Inductance breaking arc discharge waveform is quickly extracted, it is applied widely.
5th, the method and step of inductive circuit breaking arc discharge time detection method of the invention is simple, reasonable in design, real
Now facilitate, can fast and effectively detect inductive circuit breaking arc discharge time, apply it to inductive circuit essential safety
Corresponding arc discharge model can be set up in detection, inductance breaking arc discharge waveform is extracted, the judgement of essential safety is carried out.
6th, the present invention's is 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
It is enough fast and effectively detection inductive circuit breaking arc discharge times, applied widely, it is practical, should with good popularization
With value.
Below by drawings and Examples, technical scheme is described in further detail.
Description of the drawings
Fig. 1 is the schematic block circuit diagram that inductive circuit breaking arc discharge time of the present invention detects circuit.
Fig. 2 is the method flow block diagram of inductive circuit breaking arc discharge time detection method of the present invention.
Fig. 3 is the circuit theory diagrams that inductive circuit breaking arc discharge time of the present invention detects circuit.
Fig. 4 is the exemplary application map of inductive circuit breaking arc discharge time detection circuit of the present invention and method.
Description of reference numerals:
1-inductive circuit；2-voltage signal processing circuit；3-split-phase delays circuit；
4-compare output circuit；5-arc duration is tested and display driver circuit；
6-arc duration display circuit.
Specific embodiment
As shown in figure 1, the inductive circuit breaking arc discharge time detection circuit of the present invention, including the voltage being sequentially connected
When signal processing circuit 2, split-phase delays circuit 3, compares the test of output circuit 4, arc duration and display driver circuit 5 and electric arc
Between display circuit 6；
As shown in figure 3, 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 for voltage signal processing circuit 2 sample point cathode voltage input VIN+, the electricity
One end of resistance 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 is 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 consisted of the resistance R3 and resistance R4 of series connection
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 figure 3, the split-phase delays circuit 3 to 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 figure 3, the output circuit 4 that compares is including comparator U2, d type flip flop U3, resistance R10, resistance R11 and electricity
Resistance R12, the in-phase input end of the comparator U2 is connected with the connection end of resistance R5 and resistance R7, and the comparator U2's is anti-phase
Input is connected with the connection end of resistance R6 and resistance R8, and the output end of the comparator U2 is by resistance R10 and externally fed
The output end VCC connection of power supply, the signal input part D and signal output part of the d type flip flop U3Connection, the d type flip flop
The clock signal input terminal CP of U3 is connected with comparator U2 output ends, and the signal output part Q of the d type flip flop U3 is through series connection
Resistance R11 and resistance R12 is grounded, and the connection end of the resistance R11 and resistance R12 is the output end for comparing output circuit 4
OUT。
When being embodied as, the power end of the instrumentation amplifier U1 is connected with 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 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 output of the externally fed power supply is 5V.
In the present embodiment, the arc duration test and display driver circuit 5 are single-chip microcomputer, and the arc duration shows electricity
Road 7 is LCDs.
In the present embodiment, as shown in figure 3, model STC89C51 of the single-chip microcomputer, the model of the LCDs
For LCD1602, clock circuit is connected on the single-chip microcomputer, the clock circuit is made up of electric capacity C2, electric capacity C3 and crystal oscillator Y1, institute
State one end of crystal oscillator Y1 be connected with the 18th pin of the single-chip microcomputer and public capacitance C2 be grounded, the other end of the crystal oscillator Y1 with
The 19th pin connection of the single-chip microcomputer and public capacitance C3 ground connection；29th pin of the single-chip microcomputer and the 40th pin with outward
The output end VCC1 connection of portion's power supply, the 20th pin ground connection of the single-chip microcomputer, the 13rd pin of the single-chip microcomputer and institute
State the output end OUT connection for comparing output circuit 4, the 6th pin of the LCDs, the 5th pin and the 4th pin successively with
The connection of 32nd pin of the single-chip microcomputer, the 33rd pin and the 34th pin, the 1st pin of the LCDs and the 16th pin
It is grounded, the 2nd pin of the LCDs and the 15th pin are connected with output end VCC1 of externally fed power supply, described
3rd pin of LCDs is grounded by resistance R13.
When being embodied as, the voltage of the output end VCC1 output of the externally fed power supply is 5V.
In the present embodiment, model AD623 of the instrumentation amplifier U1.The instrumentation amplifier U1's of model AD623
Pin 2 is inverting input, and pin 3 is in-phase input end, and pin 4 is earth terminal, and pin 7 is power end, and pin 6 is output
End.
In the present embodiment, model LM2903 of the comparator U2.
In the present embodiment, model 74HC75 of the d type flip flop U3.
As shown in Fig. 2 the inductive circuit breaking arc discharge time of the present invention carries out detection method, comprise the following steps：
Step one, detection circuit connection：The sample point positive pole of the inductive circuit 1 for detecting breaking arc discharge time will be needed
It is connected with the sample point cathode voltage input VIN+ of voltage signal processing circuit 2, it would be desirable to detect breaking arc discharge time
The sample point negative pole of inductive circuit 1 be connected with the sample point cathode voltage input VIN- of voltage signal processing circuit 2；And will
Safety spark experimental rig G be connected on the inductive circuit 1 for needing to detect breaking arc discharge time sample point positive pole and negative pole it
Between；
Step 2, voltage signal process：In the course of work of inductive circuit 1, voltage signal processing circuit 2 is to inductive circuit 1
The double-width grinding differential signal of sample point positive pole and cathode voltage be amplified after process, be converted into single-ended voltage signal output
Delay circuit 3 to split-phase；
Step 3, inductive circuit breaking arc discharge time detect that detailed process is：
When two electrodes of safety spark experimental rig G are in closure state, the normal work of inductive circuit 1, now, electricity
Induction charging energy storage in inductive circuit 1, when inductive current reaches maximum, sample point positive pole and the sampling of inductive circuit 1
Voltage between point negative pole is zero, and the output voltage of instrumentation amplifier U1 is also zero in voltage signal processing circuit 2；Voltage signal
The voltage of the output of process circuit 2 is divided into two-way, delays the first proportion resistor network partial pressure in circuit 3 through the split-phase all the way
The in-phase input end for comparing comparator U2 in output circuit 4 is exported afterwards, and another road delays in circuit 3 through the split-phase
The inverting input for comparing comparator U2 in output circuit 4 is exported after two proportion resistor network partial pressures, due to the resistance of resistance R5
The resistance of value, the resistance of resistance R6, the resistance of resistance R7 and resistance R8 meets relational expressionTherefore compare
The voltage of the in-phase input end of device U2 is less than the voltage of its inverting input, comparator U2 output low levels so that d type flip flop U3
In latch mode, d type flip flop U3 is not detected by the voltage signal for changing, and 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 closure, because the loop current of inductive circuit 1 can not be mutated, causes breakpoint that voltage jump, inductance occur
Circuit 1 starts to produce arc discharge；The voltage of the output of voltage signal processing circuit 2 is divided into two-way, prolongs through the split-phase all the way
The in-phase input end for comparing comparator U2 in output circuit 4 is exported after the first proportion resistor network partial pressure in slow circuit 3, separately
Export to compare after the split-phase delays the second proportion resistor network partial pressure in circuit 3 all the way and compare in output circuit 4
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 meets
Relational expressionBut because electric capacity C1 has delayed the voltage of output after the second proportion resistor network partial pressure
Change so that the voltage of the in-phase input end of comparator U2 more than its inverting input voltage, the high electricity of comparator U2 outputs
It is flat, because d type flip flop U3 is rising edge triggering, therefore, d type flip flop U3 output high level；The high level Jing of d type flip flop U3 outputs
Cross and export after resistance R11 and resistance R12 partial pressures to arc duration test and display driver circuit 5, when arc duration is tested and aobvious
When showing that drive circuit 5 detects high level arrival, start timing；
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 to compare in output circuit 4 and compares after the split-phase delays the first proportion resistor network partial pressure in circuit 3 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 little
In the voltage of its inverting input, comparator U2 outputs maintain low level, d type flip flop U3 outputs 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, and inductive circuit 1 generates again the voltage signal of a mutation,
The voltage of the output of voltage signal processing circuit 2 is divided into two-way, delays the first proportion resistor in circuit 3 through the split-phase all the way
The in-phase input end for comparing comparator U2 in output circuit 4 is exported after network partial pressure, another road delays electricity through the split-phase
The inverting input for comparing comparator U2 in output circuit 4 is exported after the second proportion resistor network partial pressure in road 3, 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 the voltage of output after the second proportion resistor network partial pressure so that comparator U2 is again
Output high level, d type flip flop U3 detects the voltage signal that this changes from low to high, and the upset of output state logic is low electricity
It is flat, need the arc discharge of inductive circuit 1 for detecting breaking arc discharge time to terminate；D type flip flop U3 output logic state upsets
When, producing a trailing edge and export to arc duration test and display driver circuit 5, arc duration is tested and display driver circuit
5 stop timing, and the time that timing is obtained is designated as the breaking arc of inductive circuit 1 and is put by arc duration test and display driver circuit 5
The electric time, and export and shown to arc duration display circuit 6.
For example, as shown in figure 4, needing the inductive circuit 1 for detecting breaking arc discharge time 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 inductance L's
The other end is the sample point positive pole of inductive circuit 1, and one end and the direct voltage source Vi cathode output ends of the current-limiting resistance RL connect
Connect and be grounded, 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, the normal work of inductive circuit 1, now, electricity
Sense L charging energy-storings, comparator U2 output low levels so that d type flip flop U3 is in latch mode, and d type flip flop U3 is not detected by
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 closure, and the resistance in inductive circuit 1 increases suddenly, because the loop current of inductive circuit 1 can not be mutated, is caused
Make breakpoint that voltage jump to occur, inductive circuit 1 starts to produce arc discharge；Comparator U2 exports high level, d type flip flop U3 inspections
The level of change is measured, high level is exported, inductive circuit 1 starts arc discharge；The high level of d type flip flop U3 outputs is through resistance
Export after R11 and resistance R12 partial pressures to arc duration test and display driver circuit, test and show driving electricity when arc duration
When road detects high level arrival, start timing；
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, and inductive circuit 1 generates again the voltage signal of a mutation,
Comparator U2 exports again high level, and d type flip flop U3 detects the voltage signal that this changes from low to high, output state logic
Overturn as low level, the arc discharge of inductive circuit 1 terminates；When d type flip flop U3 output logic states overturn, a trailing edge is produced
Export to arc duration test and display driver circuit, arc duration is tested and display driver circuit stops timing, arc duration
The time that timing is obtained is designated as the breaking arc discharge time of inductive circuit 1 by test and display driver circuit, and is exported to electric arc
Time display circuit is shown.
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 (7)
1. a kind of inductive circuit breaking arc discharge time detect circuit, it is characterised in that：Including the voltage signal being sequentially connected
Process circuit (2), split-phase delay circuit (3), compare output circuit (4), arc duration test and display driver circuit (5) and electricity
Arc time display circuit (6)；
The voltage signal processing circuit (2) is described including instrumentation amplifier U1, resistance R1, resistance R2, resistance R3 and resistance R4
One end of resistance R1 for voltage signal processing circuit (2) sample point cathode voltage input VIN+, one end of the resistance R3
For the resistance that the sample point cathode voltage input VIN- of voltage signal processing circuit (2), sample point cathode voltage pass 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 series connection resistance R3 and resistance R4 constitute resistor voltage divider network connection
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 circuit (3) including 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 connects, 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 connects, 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 is including comparator U2, d type flip flop U3, resistance R10, resistance R11 and resistance R12, the ratio
In-phase input end compared with device U2 is connected with the connection end of resistance R5 and resistance R7, the inverting input and resistance of the comparator U2
The connection end connection of R6 and resistance R8, the output end of the comparator U2 is by resistance R10 and the output end of externally fed power supply
VCC connects, the signal input part D and signal output part of the d type flip flop U3Connection, the clock signal of the d type flip flop U3
Input CP is connected with comparator U2 output ends, and the signal output part Q of the d type flip flop U3 passes through the resistance R11 and electricity of series connection
Resistance R12 ground connection, the connection end of the resistance R11 and resistance R12 is output end OUT for comparing output circuit (4).
2. according to the inductive circuit breaking arc discharge time detection circuit described in claim 1, it is characterised in that：The electric arc
Time test and display driver circuit (5) are single-chip microcomputer, and the arc duration display circuit (6) is LCDs.
3. according to the inductive circuit breaking arc discharge time detection circuit described in claim 2, it is characterised in that：The monolithic
Model STC89C51 of machine, model LCD1602 of the LCDs is connected to clock circuit, institute on the single-chip microcomputer
State clock circuit to be made up of electric capacity C2, electric capacity C3 and crystal oscillator Y1, one end of the crystal oscillator Y1 and the 18th pin of the single-chip microcomputer
Connection and public capacitance C2 ground connection, the other end of the crystal oscillator Y1 is connected and public capacitance C3 with the 19th pin of the single-chip microcomputer
Ground connection；29th pin of the single-chip microcomputer and the 40th pin are connected with output end VCC1 of externally fed power supply, the monolithic
The 20th pin ground connection of machine, the 13rd pin of the single-chip microcomputer is connected with output end OUT for comparing output circuit (4), institute
State the 6th pin, the 5th pin and the 4th pin of LCDs the 32nd pin, the 33rd pin and successively with the single-chip microcomputer
34 pins connect, and the 1st pin of the LCDs and the 16th pin are grounded, the 2nd pin of the LCDs and
15th pin is connected with output end VCC1 of externally fed power supply, and the 3rd pin of the LCDs is connect by resistance R13
Ground.
4. according to the inductive circuit breaking arc discharge time detection circuit described in claim 1, it is characterised in that：The instrument is used
Model AD623 of amplifier U1.
5. according to the inductive circuit breaking arc discharge time detection circuit described in claim 1, it is characterised in that：The comparison
Model LM2903 of device U2.
6. according to the inductive circuit breaking arc discharge time detection circuit described in claim 1, it is characterised in that：The D is touched
Send out model 74HC75 of device U3.
7. it is a kind of to detect the side that circuit is detected to inductive circuit breaking arc discharge time using as claimed in claim 1
Method, it is characterised in that the method is comprised the following steps：
Step one, detection circuit connection：Will need detect breaking arc discharge time inductive circuit (1) sample point positive pole with
The sample point cathode voltage input VIN+ connections of voltage signal processing circuit (2), it would be desirable to detect breaking arc discharge time
The sample point negative pole of inductive circuit (1) be connected with the sample point cathode voltage input VIN- of voltage signal processing circuit (2)；
And safety spark experimental rig G is connected on need detect breaking arc discharge time inductive circuit (1) sample point positive pole with
Between negative pole；
Step 2, voltage signal process：In needing inductive circuit (1) course of work for detect breaking arc discharge time, voltage
Signal processing circuit (2) to need detect breaking arc discharge time inductive circuit (1) sample point positive pole and cathode voltage
Double-width grinding differential signal be amplified after process, be converted into single-ended voltage signal and export to delay circuit (3) to split-phase；
Step 3, inductive circuit breaking arc discharge time detect that detailed process is：
When two electrodes of safety spark experimental rig G are in closure state, inductive circuit (1) normal work, now, inductance
Induction charging energy storage in circuit (1), until inductive current reach maximum when, the sample point positive pole of inductive circuit (1) with take
Voltage between sampling point negative pole is zero, and the output voltage of instrumentation amplifier U1 is also zero in voltage signal processing circuit (2)；Voltage
The voltage of signal processing circuit (2) output is divided into two-way, delays the first proportion resistor in circuit (3) through the split-phase all the way
To the in-phase input end for comparing comparator U2 in output circuit (4), another road delays through the split-phase for output after network partial pressure
Export to the inverting input for comparing comparator U2 in output circuit (4) after the second proportion resistor network partial pressure in circuit (3),
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 is not detected by the voltage signal for changing, output
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, and because the loop current of inductive circuit (1) can not be mutated, causes breakpoint that voltage jump, inductance electricity occur
Road (1) starts to produce arc discharge；The voltage of voltage signal processing circuit (2) output is divided into two-way, all the way through the split-phase
Delay to export defeated to the homophase for comparing comparator U2 in output circuit (4) after the first proportion resistor network partial pressure in circuit (3)
Enter end, 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
The resistance of R8 meets relational expressionBut because electric capacity C1 has delayed the second proportion resistor network partial pressure
The change of the voltage for exporting afterwards so that the voltage of the in-phase input end of comparator U2 compares more than the voltage of its inverting input
Device U2 exports high level, because d type flip flop U3 is rising edge triggering, therefore, d type flip flop U3 output high level；D type flip flop U3 is defeated
The high level for going out is exported to arc duration test and display driver circuit (5) after resistance R11 and resistance R12 partial pressures, works as electricity
When arc time test and display driver circuit (5) detect high level arrival, start timing；
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, the voltage of the output of voltage signal processing circuit 2 is divided into two-way, one
Road exports after the split-phase delays the first proportion resistor network partial pressure in circuit 3 compares comparator in output circuit 4
The in-phase input end of U2, another road export after the split-phase delays the second proportion resistor network partial pressure in circuit 3 to than
Compared with the inverting input of comparator U2 in output circuit 4, due to resistance, the resistance of resistance R6, the resistance of resistance R7 of resistance R5
Meet relational expression with the resistance of resistance R8Therefore the voltage of the in-phase input end of comparator U2 is less than it
The voltage of inverting input, comparator U2 outputs maintain low level, d type flip flop U3 outputs to 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, and inductive circuit (1) generates again the voltage signal of a mutation,
The voltage of the output of voltage signal processing circuit 2 is divided into two-way, delays the first proportion resistor in circuit 3 through the split-phase all the way
The in-phase input end for comparing comparator U2 in output circuit 4 is exported after network partial pressure, another road delays electricity through the split-phase
The inverting input for comparing comparator U2 in output circuit 4 is exported after the second proportion resistor network partial pressure in road 3, 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 the voltage of output after the second proportion resistor network partial pressure so that comparator U2 is again
Output high level, d type flip flop U3 detects the voltage signal that this changes from low to high, and the upset of output state logic is low electricity
It is flat, need inductive circuit (1) arc discharge for detecting breaking arc discharge time to terminate；D type flip flop U3 outputs logic state is turned over
When turning, produce a trailing edge and export to arc duration test and display driver circuit (5), arc duration is tested and shown and drives
Circuit (5) stops timing, and the time that timing is obtained is designated as inductive circuit (1) by arc duration test and display driver circuit (5)
Breaking arc discharge time, and export and shown to arc duration display circuit (6).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112345928A (en) * | 2020-10-16 | 2021-02-09 | 大连理工大学 | Method for measuring current after arc based on tunnel magnetoresistive element |
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| CN106646199B (en) | 2019-08-09 |
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