CN106646199B - Inductive circuit breaking arc discharge time detection circuit and method - Google Patents
Inductive circuit breaking arc discharge time detection circuit and method Download PDFInfo
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- CN106646199B CN106646199B CN201611261074.6A CN201611261074A CN106646199B CN 106646199 B CN106646199 B CN 106646199B CN 201611261074 A CN201611261074 A CN 201611261074A CN 106646199 B CN106646199 B CN 106646199B
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Abstract
The invention discloses a kind of inductive circuit breaking arc discharge time detection circuit and method, circuit includes that sequentially connected voltage signal processing circuit, split-phase delay circuit, compare output circuit, arc duration test and display driver circuit and arc duration display circuit；Voltage signal processing circuit includes instrumentation amplifier U1, resistance R1, R2, R3 and R4, and it includes resistance R5, R6, R7 and R8 and capacitor C1 that split-phase, which delays circuit, and comparing output circuit includes comparator U2, d type flip flop U3, resistance R10, R11 and R12；Its method is comprising steps of the connection of one, detection circuit, two, voltage signal processing, three, the detection of inductive circuit breaking arc discharge time.Circuit structure of the present invention is simple, and rationally, it is convenient and at low cost to realize for design, stable and reliable in work, can quickly and effectively detect inductive circuit breaking arc discharge time, applied widely, practical, has good application value.
Description
Technical field
The invention belongs to inductive circuit breaking arc discharge time detection technique fields, and in particular to a kind of inductive circuit point
Power off arc discharge time detection circuit and method.
Background technique
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 test result is drawn are the foundations for designing intrinsicallysafecircuit.Electricity is tested using safety spark experimental rig
Inductive circuit, discharge time are exactly the duration that circuital current decays to zero from the steady-state value before disconnection when igniting, it is determined
In the feature of the material of device electrode, structure, switch speed and circuit transitional processes and concentration, temperature, the pressure of test gas
Power etc..If the mathematical models of discharge time and electrode gap voltage, curent change rule can be established, its volt-ampere is established
Characteristic equation, discharge time are also just readily solved.But at present due to the complexity of actual discharge process, the mechanism ignited is discharged still
It is not fully aware of, complete theory can not be established and carry out quantitative description electric discharge ignition Process, and when the electric discharge of inductive circuit breaking arc
Between be an implicit function relevant to circuit parameter, it is thus possible to accurate measurement inductive circuit breaking arc discharge time, which becomes, asks
The key of topic.
Have at present to the research method of discharge time: the method for 1. utilizing mathematical model, by establishing inductance breaking arc
The characteristics of mathematical model of electric discharge according to current attenuation during inductance disjunction is zero, calculate the electric discharge of inductance breaking arc when
Between；2. using computer method measured directly, main operational principle is to be counted using counter to discharge pulse number
Number, and then determine discharge period when inductive circuit disconnects.The method of employing mode 1., advantage are simply, convenient for calculating.
But due to inductive circuit disconnect after, actual Current Voltage changing rule is nonlinear, thus it there is a certain error.It adopts
With the method for mode 2., working principle is simple, using convenient, but due to several factors may cause two break sparks it
Between time interval have error so as to cause the deviation of counting.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of circuit structure
Simply, design is rationally, realization is convenient and at low cost, stable and reliable in work, can quickly and effectively detect inductive circuit disjunction electricity
When arc discharge time, inductive circuit breaking arc applied widely, practical, with good application value discharge
Between detection circuit.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: when a kind of inductive circuit breaking arc discharges
Between detection circuit, it is characterised in that: including sequentially connected voltage signal processing circuit, split-phase delay circuit, compare output electricity
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 one end for stating resistance R1 is the sample point cathode voltage input terminal VIN+ of voltage signal processing circuit, and one end of the resistance R3 is
The sample point cathode voltage input terminal VIN- of voltage signal processing circuit, sample point cathode voltage pass through concatenated resistance R1 and electricity
The resistor voltage divider network that resistance R2 is constituted is connected to ground, the connecting pin and the same phase of instrumentation amplifier U1 of the resistance R1 and resistance R2
Input terminal connection, sample point cathode voltage are connected to ground by the resistor voltage divider network that concatenated resistance R3 and resistance R4 is constituted,
The connecting pin of the resistance R3 and resistance R4 is connect with the inverting input terminal of instrumentation amplifier U1；
It includes capacitor C1 that the split-phase, which delays circuit, the first proportion resistor network being made of resistance R5 and resistance R7, with
And the second proportion resistor network being made of resistance R6 and resistance R8；Resistance value, the resistance value of resistance R6, resistance R7 of the resistance R5
Resistance value and the resistance value 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 capacitor C1 and resistance R6 and resistance
The connecting pin of R8 connects, the other end ground connection of the capacitor C1；
The relatively output circuit includes comparator U2, d type flip flop U3, resistance R10, resistance R11 and resistance R12, described
The non-inverting input terminal of comparator U2 is connect with the connecting pin of resistance R5 and resistance R7, the inverting input terminal and electricity of the comparator U2
Resistance R6 is connected with the connecting pin of resistance R8, and the output end of the comparator U2 passes through the output of resistance R10 and external power supply power supply
Hold VCC connection, the signal input part D and signal output end of the d type flip flop U3Connection, the clock letter of the d type flip flop U3
Number input terminal CP is connect with comparator U2 output end, the signal output end Q of the d type flip flop U3 by concatenated resistance R11 and
The connecting pin of resistance R12 ground connection, the resistance R11 and resistance R12 are the output end OUT of the relatively 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 microcontroller, and the arc duration display circuit is liquid crystal display.
Above-mentioned inductive circuit breaking arc discharge time detection circuit, it is characterised in that: the model of the single-chip microcontroller
STC89C51, the model LCD1602 of the liquid crystal display are connected to clock circuit, the clock circuit on the single-chip microcontroller
It is made of capacitor C2, capacitor C3 and crystal oscillator Y1, one end of the crystal oscillator Y1 is connect and public with the 18th pin of the single-chip microcontroller
Capacitor C2 ground connection, the other end of the crystal oscillator Y1 is connect with the 19th pin of the single-chip microcontroller and public capacitance C3 is grounded；It is described
29th pin of single-chip microcontroller and the 40th pin are connect with the output end VCC1 of external power supply power supply, and the 20th of the single-chip microcontroller is drawn
Foot ground connection, the output end OUT connection of the 13rd pin of single-chip microcontroller output circuit compared with described, the liquid crystal display
6th pin, the 5th pin and the 4th pin are successively connect with the 32nd pin, the 33rd pin and the 34th pin of the single-chip microcontroller, institute
The 1st pin and the 16th pin for stating liquid crystal display are grounded, and the 2nd pin of the liquid crystal display and the 15th pin are and outside
The output end VCC1 connection of portion's power supply, the 3rd pin of the liquid crystal display are 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.
Rationally, realization is convenient, can quickly and effectively detect electricity for simple, design that the present invention also provides a kind of method and steps
The inductive circuit breaking arc discharge time detection method of inductive circuit breaking arc discharge time, which is characterized in that this method packet
Include following steps:
Step 1: detection circuit connects: will need to detect the sample point anode of the inductive circuit of breaking arc discharge time
It is connect with the sample point cathode voltage input terminal VIN+ of voltage signal processing circuit, will need to detect breaking arc discharge time
The sample point cathode voltage input terminal VIN- connection of the sample point cathode and voltage signal processing circuit of inductive circuit；And it will be safe
Spark test apparatus G connects between the sample point positive electrode and negative electrode for needing to detect the inductive circuit of breaking arc discharge time；
Step 2: voltage signal is handled: in 1 course of work of inductive circuit, voltage signal processing circuit 2 is to inductive circuit 1
Sample point positive electrode and negative electrode voltage double-width grinding differential signal amplify processing after, be converted into single-ended voltage signal output
Delay circuit 3 to split-phase；
Step 3: inductive circuit breaking arc discharge time is detected, detailed process are as follows:
When safety spark experimental rig G two electrodes in the closure state, inductive circuit work normally, at this point, electric
Induction charging energy storage in inductive circuit, when inductive current reaches maximum value, the sample point anode and sample point of inductive circuit
Voltage between cathode is zero, and the output voltage of instrumentation amplifier U1 is also zero in voltage signal processing circuit；At voltage signal
The voltage that reason circuit 2 exports is divided into two-way, all the way after the split-phase delays the first proportion resistor network in circuit 3 to divide
It is output to the non-inverting input terminal for comparing comparator U2 in output circuit 4, another way delays second in circuit 3 by the split-phase
Proportion resistor network partial pressure after be output to the inverting input terminal for comparing comparator U2 in output circuit 4, due to the resistance value of resistance R5,
The resistance value of the resistance value of resistance R6, the resistance value of resistance R7 and resistance R8 meets relational expressionTherefore comparator
The voltage of the non-inverting input terminal of U2 is less than the voltage of its inverting input terminal, and comparator U2 exports low level, so that at d type flip flop U3
In latch mode, d type flip flop U3 does not detect the voltage signal of variation, 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 being closed, and since the loop current of inductive circuit 1 cannot be mutated, causes breakpoint that voltage jump, inductance occurs
Circuit 1 starts to generate arc discharge；The voltage that voltage signal processing circuit 2 exports is divided into two-way, prolongs all the way by the split-phase
It is output to the non-inverting input terminal for comparing comparator U2 in output circuit 4 after the first proportion resistor network partial pressure in slow circuit 3, separately
It is output to compare in output circuit 4 after the split-phase delays the second proportion resistor network in circuit 3 to divide all the way and compare
The inverting input terminal of device U2, although the resistance value of resistance R5, the resistance value of resistance R6, the resistance value satisfaction of the resistance value of resistance R7 and resistance R8
Relational expressionBut the voltage exported after having delayed the second proportion resistor network to divide due to capacitor C1
Variation so that the voltage of the non-inverting input terminal of comparator U2 is greater than the voltage of its inverting input terminal, the high electricity of comparator U2 output
It is flat, since d type flip flop U3 is rising edge triggering, d type flip flop U3 exports high level；The high level warp of d type flip flop U3 output
Output is to arc duration test and display driver circuit after crossing resistance R11 and resistance R12 partial pressure, when arc duration is tested and is shown
When driving circuit detects that high level arrives, start timing；
With the propulsion of time, the degree of two electrode separations of safety spark experimental rig G is gradually increased, arc current
Approximately linear decaying, the arc voltage at disjunction slowly rises at this time, and the voltage that voltage signal processing circuit 2 exports is divided into two
Road is output to compare in output circuit 4 and compare after the split-phase delays the first proportion resistor network in circuit 3 to divide all the way
Compared with the non-inverting input terminal of device U2, another way exports after the split-phase delays the second proportion resistor network in circuit 3 to divide
To the inverting input terminal for comparing comparator U2 in output circuit 4, due to the resistance value of resistance R5, the resistance value of resistance R6, resistance R7
Resistance value and the resistance value of resistance R8 meet relational expressionTherefore the voltage of the non-inverting input terminal of comparator U2 is small
In the voltage of its inverting input terminal, comparator U2 output maintains low level, and d type flip flop U3 output keeps high level；
As two electrode distances of safety spark experimental rig G further increase, arc current falls to zero suddenly, this
When, two electrodes of safety spark experimental rig G are completely separated, and inductive circuit 1 produces the voltage signal of a mutation again,
The voltage that voltage signal processing circuit 2 exports is divided into two-way, delays the first proportion resistor in circuit 3 by the split-phase all the way
The non-inverting input terminal for comparing comparator U2 in output circuit 4 is output to after network partial pressure, another way delays electricity by the split-phase
It is output to the inverting input terminal for comparing comparator U2 in output circuit 4 after the second proportion resistor network partial pressure in road 3, although electric
The resistance value for hindering the resistance value of R5, the resistance value of resistance R6, the resistance value of resistance R7 and resistance R8 meets relational expression
But the variation of the voltage exported after having delayed the second proportion resistor network to divide due to capacitor C1, so that comparator U2 is again
High level is exported, d type flip flop U3 detects this voltage signal changed from low to high, and the overturning of output state logic is low electricity
Flat, the inductive circuit arc discharge for needing to detect breaking arc discharge time terminates；D type flip flop U3 exports logic state overturning
When, it generates a failing edge and exports to arc duration test and display driver circuit, arc duration test and display driver circuit
Stop timing, when the time that arc duration test and display driver circuit obtain timing is denoted as the electric discharge of inductive circuit breaking arc
Between, and export and shown to arc duration display circuit.
Compared with the prior art, the present invention has the following advantages:
1, the circuit structure of inductive circuit breaking arc discharge time detection circuit of the present invention is simple, and design rationally, is realized
It is convenient and at low cost, it is stable and reliable in work.
2, inductive circuit breaking arc discharge time detection circuit of the invention, compensates for mathematical model method and computer is straight
The deficiency for connecing mensuration measurement inductive circuit breaking arc discharge time, can directly display out in arc duration display circuit
Measurement result is provided convenience to scientific research personnel.
3, inductive circuit breaking arc discharge time detection circuit of the invention is discharged according to inductive circuit breaking arc
The detection circuit of the Variation Features design of voltage waveform, instrumentation amplifier, the comparator fast response time of selection, the electricity measured
Arc discharge time error is small, and precision is high.
4, inductive circuit breaking arc discharge time detection circuit of the invention not only can be adapted for actual spark examination
In testing, it can be applicable in various inductive circuit breaking arc electric discharge l-G simulation tests, by means of simulation software
Inductance breaking arc discharge waveform is quickly extracted, it is applied widely.
5, the method and step of inductive circuit breaking arc discharge time detection method of the invention is simple, and design is rationally, real
Now facilitate, can quickly and effectively detect inductive circuit breaking arc discharge time, apply it to inductive circuit essential safety
It can establish corresponding arc discharge model in detection, extract inductance breaking arc discharge waveform, carry out the judgement of essential safety.
6, of the invention practical, there is good application value.
In conclusion circuit structure of the present invention is simple, design rationally, realizes convenient and at low cost, stable and reliable in work, energy
It is enough quickly and effectively detection inductive circuit breaking arc discharge times, applied widely, it is practical, there is good popularization to answer
With value.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the schematic block circuit diagram of inductive circuit breaking arc discharge time detection circuit of the present invention.
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 diagram of inductive circuit breaking arc discharge time detection circuit of the present invention.
Fig. 4 is the exemplary application map of inductive circuit breaking arc discharge time detection circuit of the present invention and method.
Description of symbols:
1-inductive circuit；2-voltage signal processing circuits；3-split-phases delay circuit；
4-compare output circuit；The test of 5-arc durations and display driver circuit；
6-arc duration display circuits.
Specific embodiment
As shown in Figure 1, inductive circuit breaking arc discharge time detection circuit of the invention, including sequentially connected voltage
When signal processing circuit 2, split-phase delay circuit 3, compare output circuit 4, arc duration test 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 is the sample point cathode voltage input terminal VIN+ of voltage signal processing circuit 2, the electricity
The one end for hindering R3 is the sample point cathode voltage input terminal VIN- of voltage signal processing circuit 2, and sample point cathode voltage passes through string
The resistor voltage divider network that the resistance R1 and resistance R2 of connection are constituted is connected to ground, and the connecting pin and instrument of the resistance R1 and resistance R2 are used
The non-inverting input terminal of amplifier U1 connects, the divider resistance that sample point cathode voltage is made up of concatenated resistance R3 and resistance R4
It is connected to the network to ground, the connecting pin of the resistance R3 and resistance R4 are connect with the inverting input terminal of instrumentation amplifier U1；
As shown in figure 3, it includes capacitor C1, the first ratio being made of resistance R5 and resistance R7 that the split-phase, which delays circuit 3,
Resistor network, and the second proportion resistor network being made of resistance R6 and resistance R8；The resistance value of the resistance R5, resistance R6
The resistance value of resistance value, the resistance value of resistance R7 and resistance R8 meets relational expressionOne end of the resistance R5 with
The output end of instrumentation amplifier U1 connects, and the other end of the resistance R5 is grounded by resistance R7, one end of the resistance R6 and
The output end of instrumentation amplifier U1 connects, and the other end of the resistance R6 is grounded by resistance R8, one end of the capacitor C1 and
Resistance R6 is connected with the connecting pin of resistance R8, the other end ground connection of the capacitor C1；
As shown in figure 3, the relatively output circuit 4 includes comparator U2, d type flip flop U3, resistance R10, resistance R11 and electricity
R12 is hindered, the non-inverting input terminal of the comparator U2 is connect with the connecting pin of resistance R5 and resistance R7, the reverse phase of the comparator U2
Input terminal is connect with the connecting pin of resistance R6 and resistance R8, and the output end of the comparator U2 passes through resistance R10 and external power supply
The output end VCC connection of power supply, the signal input part D and signal output end of the d type flip flop U3Connection, the d type flip flop
The clock signal input terminal CP of U3 is connect with comparator U2 output end, and the signal output end Q of the d type flip flop U3 is by concatenated
The connecting pin of resistance R11 and resistance R12 ground connection, the resistance R11 and resistance R12 are the output end of the relatively output circuit 4
OUT。
When it is implemented, the power end of the instrumentation amplifier U1 is connect with the output end VCC of external power supply power supply, it is described
The ground terminal of instrumentation amplifier U1 is grounded；The power end of the comparator U2 is connect with the output end VCC of external power supply power supply, institute
State the ground terminal ground connection of comparator U2.The voltage of the output end VCC output of the external power supply power supply is 5V.
In the present embodiment, the arc duration test and display driver circuit 5 are single-chip microcontroller, the arc duration display electricity
Road 7 is liquid crystal display.
In the present embodiment, as shown in figure 3, the model STC89C51 of the single-chip microcontroller, the model of the liquid crystal display
For LCD1602, it is connected to clock circuit on the single-chip microcontroller, the clock circuit is made of capacitor C2, capacitor C3 and crystal oscillator Y1, institute
The one end for stating crystal oscillator Y1 connect with the 18th pin of the single-chip microcontroller and public capacitance C2 be grounded, the other end of the crystal oscillator Y1 with
19th pin of the single-chip microcontroller connects and public capacitance C3 is grounded；29th pin of the single-chip microcontroller and the 40th pin are and outside
The output end VCC1 connection of portion's power supply, the 20th pin ground connection of the single-chip microcontroller, the 13rd pin of the single-chip microcontroller and institute
State the output end OUT connection for comparing output circuit 4, the 6th pin, the 5th pin and the 4th pin of the liquid crystal display successively with
The 32nd pin, the 33rd pin and the 34th pin of the single-chip microcontroller connect, the 1st pin of the liquid crystal display and the 16th pin
It is grounded, the 2nd pin of the liquid crystal display and the 15th pin are connect with the output end VCC1 of external power supply power supply, described
3rd pin of liquid crystal display is grounded by resistance R13.
When it is implemented, the voltage that the output end VCC1 of the external power supply power supply is exported is 5V.
In the present embodiment, the model AD623 of the instrumentation amplifier U1.The instrumentation amplifier U1's of model AD623
Pin 2 is inverting input terminal, and pin 3 is non-inverting input terminal, and pin 4 is ground terminal, and pin 7 is power end, and pin 6 is output
End.
In the present embodiment, the model LM2903 of the comparator U2.
In the present embodiment, the model 74HC75 of the d type flip flop U3.
As shown in Fig. 2, inductive circuit breaking arc discharge time of the invention carries out detection method, comprising the following steps:
Step 1: detection circuit connects: will need to detect the sample point anode of the inductive circuit 1 of breaking arc discharge time
It is connect with the sample point cathode voltage input terminal VIN+ of voltage signal processing circuit 2, will need to detect breaking arc discharge time
The sample point cathode of inductive circuit 1 connect with the sample point cathode voltage input terminal VIN- of voltage signal processing circuit 2；And it will
Safety spark experimental rig G connect the inductive circuit 1 for needing to detect breaking arc discharge time sample point positive electrode and negative electrode it
Between；
Step 2: voltage signal is handled: in 1 course of work of inductive circuit, voltage signal processing circuit 2 is to inductive circuit 1
Sample point positive electrode and negative electrode voltage double-width grinding differential signal amplify processing after, be converted into single-ended voltage signal output
Delay circuit 3 to split-phase；
Step 3: inductive circuit breaking arc discharge time is detected, detailed process are as follows:
When safety spark experimental rig G two electrodes in the closure state, inductive circuit 1 work normally, at this point, electric
Induction charging energy storage in inductive circuit 1, when inductive current reaches maximum value, the sample point anode of inductive circuit 1 and sampling
Voltage between point cathode is zero, and the output voltage of instrumentation amplifier U1 is also zero in voltage signal processing circuit 2；Voltage signal
The voltage that processing circuit 2 exports is divided into two-way, delays the first proportion resistor network in circuit 3 to divide by the split-phase all the way
It is output to the non-inverting input terminal for comparing comparator U2 in output circuit 4 afterwards, another way delays the in circuit 3 by the split-phase
It is output to the inverting input terminal for comparing comparator U2 in output circuit 4 after two proportion resistor networks partial pressure, due to the resistance of resistance R5
Value, the resistance value of resistance R6, the resistance value of the resistance value of resistance R7 and resistance R8 meet relational expressionTherefore compare
The voltage of the non-inverting input terminal of device U2 is less than the voltage of its inverting input terminal, and comparator U2 exports low level, so that d type flip flop U3
In latch mode, d type flip flop U3 does not detect the voltage signal of variation, 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 being closed, and since the loop current of inductive circuit 1 cannot be mutated, causes breakpoint that voltage jump, inductance occurs
Circuit 1 starts to generate arc discharge；The voltage that voltage signal processing circuit 2 exports is divided into two-way, prolongs all the way by the split-phase
It is output to the non-inverting input terminal for comparing comparator U2 in output circuit 4 after the first proportion resistor network partial pressure in slow circuit 3, separately
It is output to compare in output circuit 4 after the split-phase delays the second proportion resistor network in circuit 3 to divide all the way and compare
The inverting input terminal of device U2, although the resistance value of resistance R5, the resistance value of resistance R6, the resistance value satisfaction of the resistance value of resistance R7 and resistance R8
Relational expressionBut the voltage exported after having delayed the second proportion resistor network to divide due to capacitor C1
Variation so that the voltage of the non-inverting input terminal of comparator U2 is greater than the voltage of its inverting input terminal, the high electricity of comparator U2 output
It is flat, since d type flip flop U3 is rising edge triggering, d type flip flop U3 exports high level；The high level warp of d type flip flop U3 output
Output is to arc duration test and display driver circuit 5 after crossing resistance R11 and resistance R12 partial pressure, when arc duration is tested and is shown
When showing that driving circuit 5 detects that high level arrives, start timing；
With the propulsion of time, the degree of two electrode separations of safety spark experimental rig G is gradually increased, arc current
Approximately linear decaying, the arc voltage at disjunction slowly rises at this time, and the voltage that voltage signal processing circuit 2 exports is divided into two
Road is output to compare in output circuit 4 and compare after the split-phase delays the first proportion resistor network in circuit 3 to divide all the way
Compared with the non-inverting input terminal of device U2, another way exports after the split-phase delays the second proportion resistor network in circuit 3 to divide
To the inverting input terminal for comparing comparator U2 in output circuit 4, due to the resistance value of resistance R5, the resistance value of resistance R6, resistance R7
Resistance value and the resistance value of resistance R8 meet relational expressionTherefore the voltage of the non-inverting input terminal of comparator U2 is small
In the voltage of its inverting input terminal, comparator U2 output maintains low level, and d type flip flop U3 output keeps high level；
As two electrode distances of safety spark experimental rig G further increase, arc current falls to zero suddenly, this
When, two electrodes of safety spark experimental rig G are completely separated, and inductive circuit 1 produces the voltage signal of a mutation again,
The voltage that voltage signal processing circuit 2 exports is divided into two-way, delays the first proportion resistor in circuit 3 by the split-phase all the way
The non-inverting input terminal for comparing comparator U2 in output circuit 4 is output to after network partial pressure, another way delays electricity by the split-phase
It is output to the inverting input terminal for comparing comparator U2 in output circuit 4 after the second proportion resistor network partial pressure in road 3, although electric
The resistance value for hindering the resistance value of R5, the resistance value of resistance R6, the resistance value of resistance R7 and resistance R8 meets relational expression
But the variation of the voltage exported after having delayed the second proportion resistor network to divide due to capacitor C1, so that comparator U2 is again
High level is exported, d type flip flop U3 detects this voltage signal changed from low to high, and the overturning of output state logic is low electricity
Flat, 1 arc discharge of inductive circuit for needing to detect breaking arc discharge time terminates；D type flip flop U3 exports logic state overturning
When, it generates a failing edge and exports to arc duration test and display driver circuit 5, arc duration test and display driver circuit
5 stop timing, and the time that arc duration test and display driver circuit 5 obtain timing is denoted as 1 breaking arc of inductive circuit and puts
The electric time, and export and shown to arc duration display circuit 6.
For example, as shown in figure 4, needing to detect the inductive circuit 1 of breaking arc discharge time by DC voltage source Vi, inductance
L and current-limiting resistance RL concatenation is constituted, and one end of the inductance L is connect with DC voltage source Vi cathode output end, the inductance L's
The other end is the sample point anode of inductive circuit 1, and one end of the current-limiting resistance RL and DC voltage source Vi cathode output end connect
It connects and is grounded, the other end of the current-limiting resistance RL is the sample point cathode of inductive circuit 1.
When safety spark experimental rig G two electrodes in the closure state, inductive circuit 1 work normally, at this point, electric
Feel L charging energy-storing, comparator U2 exports low level, so that d type flip flop U3 is in latch mode, d type flip flop U3 is not detected
The voltage signal of variation 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 being closed, and the resistance in inductive circuit 1 increases suddenly, since the loop current of inductive circuit 1 cannot be mutated, is caused
Make breakpoint that voltage jump occur, inductive circuit 1 starts to generate arc discharge；Comparator U2 exports high level, d type flip flop U3 inspection
The level of variation is measured, high level is exported, inductive circuit 1 starts arc discharge；The high level of d type flip flop U3 output passes through resistance
Output is to arc duration test and display driver circuit after R11 and resistance R12 partial pressure, when driving electricity is tested and shown to arc duration
When road detects that high level arrives, start timing；
With the propulsion of time, the degree of two electrode separations of safety spark experimental rig G is gradually increased, arc current
Approximately linear decaying, the arc voltage at disjunction slowly rises at this time, and comparator U2 output maintains low level, and d type flip flop U3 is defeated
High level is kept out；
As two electrode distances of safety spark experimental rig G further increase, arc current falls to zero suddenly, this
When, two electrodes of safety spark experimental rig G are completely separated, and inductive circuit 1 produces the voltage signal of a mutation again,
Comparator U2 exports high level again, and d type flip flop U3 detects this voltage signal changed from low to high, output state logic
Overturning is low level, and 1 arc discharge of inductive circuit terminates；When d type flip flop U3 exports logic state overturning, a failing edge is generated
It exports to arc duration test and display driver circuit, arc duration test and display driver circuit stop timing, arc duration
The time that test and display driver circuit obtain timing is denoted as 1 breaking arc discharge time of inductive circuit, and exports to electric arc
Time display circuit is shown.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way, it is all according to the present invention
Technical spirit any simple modification to the above embodiments, change and equivalent structural changes, still fall within skill of the present invention
In the protection scope of art scheme.
Claims (5)
1. a kind of inductive circuit breaking arc discharge time detection circuit, it is characterised in that: including sequentially connected voltage signal
Processing 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) includes instrumentation amplifier U1, resistance R1, resistance R2, resistance R3 and resistance R4, described
One end of resistance R1 is the sample point cathode voltage input terminal VIN+ of voltage signal processing circuit (2), one end of the resistance R3
For the sample point cathode voltage input terminal VIN- of voltage signal processing circuit (2), sample point cathode voltage passes through concatenated resistance
The resistor voltage divider network that R1 and resistance R2 is constituted is connected to ground, the connecting pin and instrumentation amplifier U1 of the resistance R1 and resistance R2
Non-inverting input terminal connection, sample point cathode voltage connected with the resistance R4 resistor voltage divider network constituted by concatenated resistance R3
To ground, the connecting pin of the resistance R3 and resistance R4 are connect with the inverting input terminal of instrumentation amplifier U1；
It includes capacitor C1 that the split-phase, which delays circuit (3), the first proportion resistor network being made of resistance R5 and resistance R7, and
The second proportion resistor network being made of resistance R6 and resistance R8；The resistance value of the resistance R5, the resistance value of resistance R6, resistance R7
Resistance value and the resistance value of resistance R8 meet relational expressionOne end of the resistance R5 is with instrumentation amplifier U1's
Output end connection, the other end of the resistance R5 are grounded by resistance R7, and one end of the resistance R6 is with instrumentation amplifier U1's
Output end connection, the other end of the resistance R6 are grounded by resistance R8, one end of the capacitor C1 and resistance R6 and resistance R8
Connecting pin connection, the capacitor C1 the other end ground connection；
Relatively output circuit (4) include comparator U2, d type flip flop U3, resistance R10, resistance R11 and resistance R12, the ratio
Non-inverting input terminal compared with device U2 is connect with the connecting pin of resistance R5 and resistance R7, the inverting input terminal and resistance of the comparator U2
R6 is connected with the connecting pin of resistance R8, and the output end of the comparator U2 passes through the output end of resistance R10 and external power supply power supply
VCC connection, the signal input part D and signal output end of the d type flip flop U3Connection, the clock signal of the d type flip flop U3
Input terminal CP is connect with comparator U2 output end, and the signal output end Q of the d type flip flop U3 passes through concatenated resistance R11 and electricity
It hinders R12 to be grounded, the connecting pin of the resistance R11 and resistance R12 are the output end OUT of relatively output circuit (4)；
The arc duration test and display driver circuit (5) are single-chip microcontroller, and the arc duration display circuit (6) is liquid crystal
Display screen；The model AD623 of the instrumentation amplifier U1.
2. inductive circuit breaking arc discharge time detection circuit described in accordance with the claim 1, it is characterised in that: the monolithic
The model STC89C51 of machine, the model LCD1602 of the liquid crystal display are connected to clock circuit on the single-chip microcontroller, institute
It states clock circuit to be made of capacitor C2, capacitor C3 and crystal oscillator Y1, one end of the crystal oscillator Y1 and the 18th pin of the single-chip microcontroller
Connection and public capacitance C2 ground connection, the other end of the crystal oscillator Y1 is connect with the 19th pin of the single-chip microcontroller and public capacitance C3
Ground connection；29th pin of the single-chip microcontroller and the 40th pin are connect with the output end VCC1 of external power supply power supply, the monolithic
20th pin of machine is grounded, the output end OUT connection of the 13rd pin of single-chip microcontroller output circuit (4) compared with described, institute
State the 6th pin, the 5th pin and the 4th pin of liquid crystal display successively with the 32nd pin of the single-chip microcontroller, the 33rd pin and
The connection of 34 pins, the 1st pin of the liquid crystal display and the 16th pin be grounded, the 2nd pin of the liquid crystal display and
15th pin is connect with the output end VCC1 of external power supply power supply, and the 3rd pin of the liquid crystal display is connect by resistance R13
Ground.
3. inductive circuit breaking arc discharge time detection circuit described in accordance with the claim 1, it is characterised in that: the comparison
The model LM2903 of device U2.
4. inductive circuit breaking arc discharge time detection circuit described in accordance with the claim 1, it is characterised in that: the D touching
Send out the model 74HC75 of device U3.
5. a kind of side detected using detection circuit as described in claim 1 to inductive circuit breaking arc discharge time
Method, which is characterized in that method includes the following steps:
Step 1: detection circuit connects: will need to detect the sample point anode of the inductive circuit (1) of breaking arc discharge time with
The sample point cathode voltage input terminal VIN+ connection of voltage signal processing circuit (2), will need to detect breaking arc discharge time
The sample point cathode of inductive circuit (1) connect with the sample point cathode voltage input terminal VIN- of voltage signal processing circuit (2)；
And by safety spark experimental rig G connect sample point anode in the inductive circuit (1) for needing to detect breaking arc discharge time with
Between cathode；
Step 2: voltage signal is handled: needing to detect in inductive circuit (1) course of work of breaking arc discharge time, voltage
Sample point positive electrode and negative electrode voltage of the signal processing circuit (2) to the inductive circuit (1) for needing to detect breaking arc discharge time
Double-width grinding differential signal amplify processing after, be converted into single-ended voltage signal and export to delay circuit (3) to split-phase；
Step 3: inductive circuit breaking arc discharge time is detected, detailed process are as follows:
When safety spark experimental rig G two electrodes in the closure state, inductive circuit (1) work normally, at this point, inductance
Induction charging energy storage in circuit (1), until inductive current reach maximum value when, the sample point anode of inductive circuit (1) with take
Voltage between sampling point cathode 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) by the split-phase all the way
The non-inverting input terminal for comparing comparator U2 in output circuit (4) is output to after network partial pressure, another way delays by the split-phase
It is output to the inverting input terminal for comparing comparator U2 in output circuit (4) after the second proportion resistor network partial pressure in circuit (3),
Since the resistance value of the resistance value of resistance R5, the resistance value of resistance R6, the resistance value of resistance R7 and resistance R8 meet relational expressionTherefore the voltage of the non-inverting input terminal of comparator U2 is less than the voltage of its inverting input terminal, comparator
U2 exports low level, so that d type flip flop U3 is in latch mode, d type flip flop U3 does not detect the voltage signal of variation, 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 since the loop current of inductive circuit (1) cannot be mutated, causes breakpoint that voltage jump, inductance electricity occurs
Road (1) starts to generate arc discharge；The voltage of voltage signal processing circuit (2) output is divided into two-way, passes through the split-phase all the way
It is output to after delaying the first proportion resistor network in circuit (3) to divide and compares the same mutually defeated of comparator U2 in output circuit (4)
Enter end, another way is output to after the split-phase delays the second proportion resistor network in circuit (3) to divide compares output electricity
The inverting input terminal of comparator U2 in road (4), although the resistance value of resistance R5, the resistance value of resistance R6, the resistance value of resistance R7 and resistance
The resistance value of R8 meets relational expressionBut since capacitor C1 has delayed the second proportion resistor network to divide
The variation of the voltage exported afterwards is compared so that the voltage of the non-inverting input terminal of comparator U2 is greater than the voltage of its inverting input terminal
Device U2 exports high level, since d type flip flop U3 is rising edge triggering, d type flip flop U3 exports high level；D type flip flop U3 is defeated
The output after resistance R11 and resistance R12 partial pressure of high level out works as electricity to arc duration test and display driver circuit (5)
When arc time test and display driver circuit (5) detect that high level arrives, start timing；
With the propulsion of time, the degree of two electrode separations of safety spark experimental rig G is gradually increased, and arc current is approximate
Linear attenuation, the arc voltage at disjunction slowly rises at this time, and the voltage that voltage signal processing circuit 2 exports is divided into two-way, and one
Road is output to after the split-phase delays the first proportion resistor network in circuit 3 to divide compares comparator in output circuit 4
The non-inverting input terminal of U2, another way are output to ratio after the split-phase delays the second proportion resistor network in circuit 3 to divide
Compared with the inverting input terminal of comparator U2 in output circuit 4, due to the resistance value of resistance R5, the resistance value of resistance R6, the resistance value of resistance R7
Meet relational expression with the resistance value of resistance R8Therefore the voltage of the non-inverting input terminal of comparator U2 is less than it
The voltage of inverting input terminal, comparator U2 output maintain low level, and d type flip flop U3 output keeps high level；
As two electrode distances of safety spark experimental rig G further increase, arc current falls to zero suddenly, at this point,
Two electrodes of safety spark experimental rig G are completely separated, and inductive circuit (1) produces the voltage signal of a mutation again,
The voltage that voltage signal processing circuit 2 exports is divided into two-way, delays the first proportion resistor in circuit 3 by the split-phase all the way
The non-inverting input terminal for comparing comparator U2 in output circuit 4 is output to after network partial pressure, another way delays electricity by the split-phase
It is output to the inverting input terminal for comparing comparator U2 in output circuit 4 after the second proportion resistor network partial pressure in road 3, although electric
The resistance value for hindering the resistance value of R5, the resistance value of resistance R6, the resistance value of resistance R7 and resistance R8 meets relational expression
But the variation of the voltage exported after having delayed the second proportion resistor network to divide due to capacitor C1, so that comparator U2 is again
High level is exported, d type flip flop U3 detects this voltage signal changed from low to high, and the overturning of output state logic is low electricity
Flat, inductive circuit (1) arc discharge for needing to detect breaking arc discharge time terminates；D type flip flop U3 output logic state is turned over
When turning, generates a failing edge and export to arc duration test and display driver circuit (5), arc duration test and display driving
Circuit (5) stops timing, and the time that arc duration test and display driver circuit (5) obtain timing is denoted as inductive circuit (1)
Breaking arc discharge time, and export and shown to arc duration display circuit (6).
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