CN106771531B - Inductance disconnects electric arc start/stop time detection circuit and method - Google Patents
Inductance disconnects electric arc start/stop time detection circuit and method Download PDFInfo
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Abstract
Electric arc start/stop time detection circuit and method are disconnected the invention discloses a kind of inductance, and circuit includes that voltage signal processing circuit, split-phase delay circuit and compare output circuit；Voltage signal processing circuit includes instrumentation amplifier U1, resistance R1, resistance R2, resistance R3 and resistance R4, it includes capacitor C1 that split-phase, which delays circuit, 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；Comparing output circuit includes comparator U2, d type flip flop U3 and resistance R10；Its method is comprising steps of the connection of one, detection circuit, two, voltage signal processing, three, inductance disconnection electric arc start/stop time detection.Circuit structure of the present invention is simple, and it is convenient and at low cost to realize, stable and reliable in work, can quickly and effectively detect inductance and disconnect electric arc start/stop time, applied widely, has good application value.
Description
Technical field
The invention belongs to inductance to disconnect arc-detection technical field, and in particular to a kind of inductance disconnection electric arc start/stop time inspection
Slowdown monitoring circuit and method.
Background technique
There is a large amount of inflammable, explosion hazard gases or substance in the hazardous environments such as coal mine, petrochemical industry, applied to these occasions
Electronic and electrical equipment must satisfy the requirement of essential safety.For the electronic equipment containing the energy-storage travelling wave tubes such as inductance and capacitor, electricity
Electric spark caused by sense open circuit and capacitance short-circuit would be possible to ignite inflammable, explosion hazard gases or substance, in these environment
The person and equipment constitute a serious threat.Safety spark experimental rig be for used in the explosive atmosphere with electricity
Resistance, inductance, capacitor or hybrid circuit intrinsic safe explosion-proof equipment carry out a kind of device of Huo Hua Shi test.The electrode one of inductance slot is oblique
Face copper wheel, by its horizontal rotation of the minitype motor driving of 2r/min, another extremely 12 zinc-plated copper wires, by the reversible of 30r/min
Motor drives its vertical rotary, and two electrodes constantly separate, and every separation is primary, just generates a spark.Explosive intrinsic safety evaluation
It is to be detected one by one to intrinsic safety product using explosibility test under specific experimental condition using safety spark experimental rig, at
This height, period are long, and are unable to the design and manufacture of guide product.The evaluation of non-explosivity intrinsic safety is to be based on energy equivalence Principle, according to
Curve is lighted according to existing inductance and capacitor are critical, by theory analysis and is calculated, the judgement of realization circuit intrinsic safety performance, and its
Middle key is to extract corresponding discharge energy.The equivalent circuit existing research of artificial capacitor short circuit spark-testing, and
Inductive circuit is since its discharge process complexity makes progress very slow, although using mathematical modeling on theoretical basis
Mode set up the mathematical model of inductance breaking arc electric discharge, but these models establish the basis in the arc discharge time mostly
On, and the arc discharge time is an implicit function relevant to circuit parameter, therefore there are great limitations for the model established
Property.
If can be realized the detection to the electric discharge of inductance breaking arc, determine that electric arc establishes moment and arc extinction moment,
Corresponding inductance disjunction electrical discharge arc Resistance model for prediction is established, moment access arc resistance is established in electric arc, at the arc extinction moment
Arc resistance is removed, the waveform of inductance breaking arc electric discharge is extracted by means of circuit simulating software, safety spark can be replaced
Experimental rig carries out the judgement of intrinsic safety performance to inductive circuit；Further, it is also possible to design inductive circuit safety protection electricity
Road, such as electric arc establish the moment, at inductance both ends and connect a resistance or voltage limiting device etc., therefore put to inductance breaking arc
The detection of electricity, it is more exact that the detection of inductance breaking arc discharging time is necessary.
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 inductance disconnects electric arc
Only moment, inductance applied widely, practical, with good application value disconnect electric arc start/stop time detection electricity
Road.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of inductance disconnection electric arc start/stop time inspection
Slowdown monitoring circuit, it is characterised in that: delay circuit including sequentially connected voltage signal processing circuit, split-phase and compare output circuit；
The voltage signal processing circuit includes instrumentation amplifier U1, resistance R1, resistance R2, resistance R3 and resistance R4, institute
The one end for stating resistance R1 is the sample point cathode voltage input 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 and resistance R10, and the comparator U2's is same mutually defeated
Enter end to connect with the connecting pin of resistance R5 and resistance R7, the inverting input terminal of the comparator U2 and the company of resistance R6 and resistance R8
End connection is connect, the output end of the comparator U2 is connect by resistance R10 with the output end VCC of external power supply power supply, the D touching
Send out the signal input part D and signal output end of device U3Connection, the clock signal input terminal CP and comparator of the d type flip flop U3
The connection of U2 output end, the signal output end Q of the d type flip flop U3 are the output end OUT of the relatively output circuit.
Above-mentioned inductance disconnects electric arc start/stop time detection circuit, it is characterised in that: the model of the instrumentation amplifier U1
For AD623.
Above-mentioned inductance disconnects electric arc start/stop time detection circuit, it is characterised in that: the model of the comparator U2
LM2903。
Above-mentioned inductance disconnects electric arc start/stop time detection circuit, it is characterised in that: the model of the d type flip flop U3
74HC75。
Simple, design that the present invention also provides a kind of method and steps is rationally, realization is convenient, can quickly and effectively detect electricity
The inductance that sense disconnects electric arc start/stop time disconnects electric arc start/stop time detection method, which is characterized in that this method includes following step
It is rapid:
Step 1: detection circuit connects: will need to detect the sample point of the inductive circuit of inductance disconnection electric arc start/stop time
Anode is connect with the sample point cathode voltage input terminal VIN+ of voltage signal processing circuit, will be needed to detect inductance and is disconnected electric arc
The only sample point cathode voltage input terminal VIN- connection of the sample point cathode of the inductive circuit at moment and voltage signal processing circuit；
And by safety spark experimental rig G connect need to detect inductance disconnect electric arc start/stop time inductive circuit sample point anode with
Between cathode；
Step 2: voltage signal is handled: it needs to detect inductance and disconnects in the inductive circuit course of work of electric arc start/stop time,
Voltage signal processing circuit is electric to the sample point positive electrode and negative electrode for needing to detect the inductive circuit that inductance disconnects electric arc start/stop time
After the double-width grinding differential signal of pressure amplifies processing, it is converted into single-ended voltage signal and exports to delay circuit to split-phase；
Step 3: inductance disconnects the detection of electric arc start/stop time, detailed process are as follows:
When safety spark experimental rig G two electrodes in the closure state, need to detect inductance disconnect electric arc start-stop
The inductive circuit at moment works normally, and fills at this time, it may be necessary to detect the inductance that inductance disconnects in the inductive circuit of electric arc start/stop time
Electric energy storage needs to detect the sampling that inductance disconnects the inductive circuit of electric arc start/stop time when inductive current reaches maximum value
Voltage between point anode and sample point cathode is zero, and the output voltage of instrumentation amplifier U1 is also in voltage signal processing circuit
Zero；The voltage of voltage signal processing circuit output is divided into two-way, delays the first ratio in circuit electric by the split-phase all the way
It is output to the non-inverting input terminal for comparing comparator U2 in output circuit after resistance 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 after the second proportion resistor network partial pressure in road, due to resistance
The resistance value of R5, the resistance value of resistance R6, the resistance value of the resistance value of resistance R7 and resistance R8 meet relational expressionCause
The voltage of the non-inverting input terminal of this comparator U2 is less than the voltage of its inverting input terminal, and comparator U2 exports low level, so that D is touched
Hair device U3 is in latch mode, and d type flip flop U3 does not detect the voltage signal of 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 loop current due to needing to detect the inductive circuit that inductance disconnects electric arc start/stop time cannot dash forward
Become, cause breakpoint that voltage jump occurs, the inductive circuit for needing to detect inductance disconnection electric arc start/stop time starts to generate electric arc
Electric discharge；The voltage of voltage signal processing circuit output is divided into two-way, delays the first ratio in circuit by the split-phase all the way
The non-inverting input terminal for comparing comparator U2 in output circuit is output to after resistor 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 after the second proportion resistor network partial pressure in circuit, 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's is same
The voltage of phase input terminal is greater than the voltage of its inverting input terminal, and comparator U2 exports high level, since d type flip flop U3 is rising edge
Triggering, therefore, d type flip flop U3 export high level；It is recorded as inductance at the time of starting by d type flip flop U3 and export high level and disconnects electricity
Arc initial time；
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 of voltage signal processing circuit output is divided into two-way,
It is output to after the split-phase delays the first proportion resistor network in circuit to divide all the way and compares comparator in output circuit
The non-inverting input terminal of U2, another way is output to after the split-phase delays the second proportion resistor network in circuit to divide to be compared
The inverting input terminal of comparator U2 in output circuit, due to the resistance value of resistance R5, the resistance value of resistance R6, the resistance value of resistance R7 and electricity
The resistance value of resistance R8 meets relational expressionTherefore the voltage of the non-inverting input terminal of comparator U2 is less than its reverse phase
The voltage of 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, this
When, two electrodes of safety spark experimental rig G are completely separated, and need to detect the inductive circuit that inductance disconnects electric arc start/stop time
The voltage signal of a mutation is produced again, and the voltage of voltage signal processing circuit output is divided into two-way, all the way by described
Split-phase is output to the homophase input for comparing comparator U2 in output circuit after delaying the first proportion resistor network in circuit to divide
End, another way is output to compare in output circuit after the split-phase delays the second proportion resistor network in circuit to divide to be compared
Compared with the inverting input terminal of device U2, although the resistance value of resistance R5, the resistance value of resistance R6, the resistance value of the resistance value of resistance R7 and resistance R8 are full
Sufficient relational expressionBut the electricity exported after having delayed the second proportion resistor network to divide due to capacitor C1
The variation of pressure, so that comparator U2 exports high level again, d type flip flop U3 detects this voltage letter changed from low to high
Number, the overturning of output state logic is low level, needs to detect the inductive circuit arc discharge knot that inductance disconnects electric arc start/stop time
Beam；Inductance, which is recorded as, at the time of the output logic state overturning of d type flip flop U3 is generated failing edge disconnects electric arc end time.
Compared with the prior art, the present invention has the following advantages:
1, the circuit structure of inductance disconnection electric arc start/stop time detection circuit of the present invention is simple, and rationally, it is convenient to realize for design
And it is at low cost, it is stable and reliable in work.
2, inductance of the invention disconnects electric arc start/stop time detection circuit, can accurate detection go out inductance and disconnect electric arc to rise
Begin moment and end time, is that other design institutes are inaccessiable.
3, inductance of the invention disconnects electric arc start/stop time detection circuit, can be realized pair by the instrumentation amplifier of selection
In inductive circuit between the two o'clock of any disjunction voltage sampling, and to the circuit sampled itself interfere it is smaller.
4, inductance of the invention disconnects electric arc start/stop time detection circuit, instrumentation amplifier, comparator and the D triggering of selection
Device response speed is very fast, can detecte the voltage jump situation of microsecond rank or more, can detect inductance disconnection in real time
Electric arc start/stop time, real-time detection effect are obvious.
5, inductance of the invention disconnects electric arc start/stop time detection circuit, can be suitable for various inductive circuit breaking arcs
It in discharge test, matches, preferably the process of simulaed inductance breaking arc electric discharge, is simulated with safety spark experimental rig
The test of inductance breaking arc discharge process and actual spark is closer to, especially the error of inductance breaking arc discharge energy compared with
It is small, by means of simulation software, inductance breaking arc discharge waveform can be quickly and easily extracted, inductive circuit is carried out non-quick-fried
Fried property intrinsic safety judgement is capable of providing strong support, applied widely.
6, the method and step of inductance of the invention disconnection electric arc start/stop time detection method is simple, and design is reasonable, realization side
Just, it can quickly and effectively detect inductance and disconnect electric arc start/stop time.
7, 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
Enough quickly and effectively detection inductance disconnect electric arc start/stop time, applied widely, practical, have good popularization and application valence
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 that inductance of the present invention disconnects electric arc start/stop time detection circuit.
Fig. 2 is the circuit diagram that inductance of the present invention disconnects electric arc start/stop time detection circuit.
Fig. 3 is the method flow block diagram that inductance of the present invention disconnects electric arc start/stop time detection method.
Fig. 4 is the exemplary application map that inductance of the present invention disconnects electric arc start/stop time detection circuit and method.Appended drawing reference is said
It is bright:
1-inductive circuit；2-voltage signal processing circuits；3-split-phases delay circuit；
4-compare output circuit.
Specific embodiment
As shown in Figure 1, inductance of the invention disconnects electric arc start/stop time detection circuit, including sequentially connected voltage signal
Processing circuit 2, split-phase delay circuit 3 and compare output circuit 4；
As shown in Fig. 2, the voltage signal processing circuit 2 includes instrumentation amplifier U1, resistance R1, resistance R2, resistance R3
With resistance R4, one end of the resistance R1 is the sample point cathode voltage input 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 Fig. 2, 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 Fig. 2, the relatively output circuit 4 includes comparator U2, d type flip flop U3 and resistance R10, the comparator
The non-inverting input terminal of U2 is connect with the connecting pin of resistance R5 and resistance R7, the inverting input terminal of the comparator U2 and resistance R6 and
The connecting pin of resistance R8 connects, and the output end of the comparator U2 is connected by the output end VCC of resistance R10 and external power supply power supply
It connects, the signal input part D and signal output end of the d type flip flop U3Connection, the clock signal input terminal of the d type flip flop U3
CP is connect with comparator U2 output end, and the signal output end Q of the d type flip flop U3 is 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 model AD623 of the instrumentation amplifier U1.
In the present embodiment, the model LM2903 of the comparator U2.
In the present embodiment, the model 74HC75 of the d type flip flop U3.
As shown in figure 3, inductance of the invention disconnects electric arc start/stop time detection method, comprising the following steps:
Step 1: detection circuit connects: will need to detect the sample point of the inductive circuit 1 of inductance disconnection electric arc start/stop time
Anode is connect with the sample point cathode voltage input terminal VIN+ of voltage signal processing circuit 2, will be needed to detect inductance and is disconnected electric arc
The sample point cathode of the inductive circuit 1 of start/stop time and the sample point cathode voltage input terminal VIN- of voltage signal processing circuit 2
Connection；And safety spark experimental rig G is connect into the sample point in the inductive circuit 1 for needing to detect inductance disconnection electric arc start/stop time
Between positive electrode and negative electrode；
Step 2: voltage signal is handled: needing to detect 1 course of work of inductive circuit that inductance disconnects electric arc start/stop time
In, 2 pairs of voltage signal processing circuit need to detect inductance and disconnect the sample point anode of inductive circuit 1 of electric arc start/stop time and negative
After the double-width grinding differential signal of pole tension amplifies processing, it is converted into single-ended voltage signal and exports to delay circuit 3 to split-phase；
Step 3: inductance disconnects the detection of electric arc start/stop time, detailed process are as follows:
When safety spark experimental rig G two electrodes in the closure state, need to detect inductance disconnect electric arc start-stop
The inductive circuit 1 at moment works normally, at this time, it may be necessary to detect the inductance in the inductive circuit 1 of inductance disconnection electric arc start/stop time
Charging energy-storing needs to detect taking for the inductive circuit 1 of inductance disconnection electric arc start/stop time when inductive current reaches maximum value
Voltage between sampling point anode and sample point cathode is zero, the output voltage of instrumentation amplifier U1 in voltage signal processing circuit 2
It also is zero；The voltage that voltage signal processing circuit 2 exports is divided into two-way, delays first 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 proportion resistor network partial pressure, another way is by described point
The anti-phase input for comparing comparator U2 in output circuit 4 is output to after mutually delaying the second proportion resistor network in circuit 3 to divide
End, 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 electricity of safety spark experimental rig G
Pole is initially separated by being closed, and the loop current due to needing to detect the inductive circuit 1 that inductance disconnects electric arc start/stop time cannot dash forward
Become, cause breakpoint that voltage jump occurs, the inductive circuit 1 for needing to detect inductance disconnection electric arc start/stop time starts to generate electric arc
Electric discharge；The voltage that voltage signal processing circuit 2 exports is divided into two-way, delays first in circuit 3 to compare by the split-phase all the way
It is output to the non-inverting input terminal for comparing comparator U2 in output circuit 4 after example resistor network partial pressure, another way passes through the split-phase
It is output to the inverting input terminal for comparing comparator U2 in output circuit 4 after delaying the second proportion resistor network in circuit 3 to divide,
Although the resistance value of resistance R5, the resistance value of resistance R6, the resistance value of the resistance value of resistance R7 and resistance R8 meet relational expressionBut the change of the voltage exported after having delayed the second proportion resistor network to divide due to capacitor C1
Change, so that the voltage of the non-inverting input terminal of comparator U2 is greater than the voltage of its inverting input terminal, comparator U2 exports high level, by
It is rising edge triggering in d type flip flop U3, therefore, d type flip flop U3 exports high level；D type flip flop U3 is started to export high level
Moment is recorded as inductance and disconnects electric arc initial time；
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 need to detect the inductive circuit that inductance disconnects electric arc start/stop time
1 produces the voltage signal of a mutation again, and the voltage that voltage signal processing circuit 2 exports is divided into two-way, passes through institute all the way
It states after split-phase delays the first proportion resistor network in circuit 3 to divide and is output to the same phase for comparing comparator U2 in output circuit 4
Input terminal, 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 R8
Resistance value meet relational expressionBut after having delayed the second proportion resistor network to divide due to capacitor C1
The variation of the voltage of output, so that comparator U2 exports high level again, d type flip flop U3 detects what this changed from low to high
Voltage signal, the overturning of output state logic are low level, need to detect 1 electric arc of inductive circuit that inductance disconnects electric arc start/stop time
Electric discharge terminates；Inductance, which is recorded as, at the time of the output logic state overturning of d type flip flop U3 is generated failing edge disconnects electric arc termination
Moment.
For example, as shown in figure 4, need to detect inductance disconnect electric arc start/stop time inductive circuit 1 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 electricity
The other end for feeling L is the sample point anode of inductive circuit 1, and one end of the current-limiting resistance RL and DC voltage source Vi cathode export
End connection and ground connection, the other end of the current-limiting resistance RL are the sample point cathode of inductive circuit 1.
When safety spark experimental rig G two electrodes in the closure state, need to detect inductance disconnect electric arc start-stop
The inductive circuit 1 at moment works normally, at this point, inductance L1 charging energy-storing, 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 is needed to detect the resistance that inductance disconnects in the inductive circuit 1 of electric arc start/stop time and is increased suddenly, due to
The loop current for needing to detect the inductive circuit that inductance disconnects electric arc start/stop time cannot be mutated, and cause breakpoint that voltage occurs prominent
Become, the inductive circuit 1 for needing to detect inductance disconnection electric arc start/stop time starts to generate arc discharge；The high electricity of comparator U2 output
Flat, d type flip flop U3 detects the voltage signal of variation, exports high level；Note at the time of starting d type flip flop U3 to export high level
Record is that inductance disconnects electric arc initial time；
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 need to detect the inductive circuit that inductance disconnects electric arc start/stop time
1 produces the voltage signal of a mutation again, and comparator U2 exports high level again, and d type flip flop U3 detects this from low
To the voltage signal of High variation, the overturning of output state logic is low level, needs to detect the electricity that inductance disconnects electric arc start/stop time
1 arc discharge of inductive circuit terminates；Inductance is recorded as at the time of the output logic state overturning of d type flip flop U3 is generated failing edge to break
Open electric arc end time.
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 (3)
1. a kind of inductance disconnects electric arc start/stop time detection circuit, it is characterised in that: including the processing of sequentially connected voltage signal
Circuit (2), split-phase delay circuit (3) and compare output circuit (4)；
The voltage signal processing circuit (2) includes instrumentation amplifier U1, resistance R1, resistance R2, resistance R3 and resistance R4, described
One end of resistance R1 is the sample point cathode voltage input 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 and resistance R10, the homophase input of the comparator U2
End is connect with the connecting pin of resistance R5 and resistance R7, the inverting input terminal of the comparator U2 and the connection of resistance R6 and resistance R8
The output end of end connection, the comparator U2 is connect by resistance R10 with the output end VCC of external power supply power supply, the D triggering
The signal input part D and signal output end of device U3Connection, the clock signal input terminal CP and comparator U2 of the d type flip flop U3
Output end connection, the signal output end Q of the d type flip flop U3 are the output end OUT of relatively output circuit (4)；
The model AD623 of the instrumentation amplifier U1；The model LM2903 of the comparator U2.
2. inductance described in accordance with the claim 1 disconnects electric arc start/stop time detection circuit, it is characterised in that: the d type flip flop
The model 74HC75 of U3.
3. a kind of carry out the method that inductance disconnects the detection of electric arc start/stop time using detection circuit as described in claim 1,
It is characterized in that, method includes the following steps:
Step 1: detection circuit connects: will need to detect the sample point of the inductive circuit (1) of inductance disconnection electric arc start/stop time just
Pole is connect with the sample point cathode voltage input terminal VIN+ of voltage signal processing circuit (2), will be needed to detect inductance and is disconnected electric arc
The sample point cathode of the inductive circuit (1) of start/stop time and the sample point cathode voltage input terminal of voltage signal processing circuit (2)
VIN- connection；And safety spark experimental rig G is connect and is needing to detect the inductive circuit (1) of inductance disconnection electric arc start/stop time
Between sample point positive electrode and negative electrode；
Step 2: voltage signal is handled: it needs to detect inductance and disconnects in inductive circuit (1) course of work of electric arc start/stop time,
Voltage signal processing circuit (2) to need to detect inductance disconnect electric arc start/stop time inductive circuit (1) sample point anode with
After the double-width grinding differential signal of cathode voltage amplifies processing, it is converted into single-ended voltage signal and exports to delay circuit to split-phase
(3)；
Step 3: inductance disconnects the detection of electric arc start/stop time, detailed process are as follows:
When safety spark experimental rig G two electrodes in the closure state, need to detect inductance disconnect electric arc start/stop time
Inductive circuit (1) work normally, at this time, it may be necessary to detect inductance disconnect electric arc start/stop time inductive circuit (1) in inductance
Charging energy-storing needs to detect the inductive circuit (1) of inductance disconnection electric arc start/stop time when inductive current reaches maximum value
Voltage between sample point anode and sample point cathode is zero, the output of instrumentation amplifier U1 in voltage signal processing circuit (2)
Voltage is also zero；The voltage of voltage signal processing circuit (2) output is divided into two-way, delays circuit (3) by the split-phase all the way
In the first proportion resistor network partial pressure after be output to the non-inverting input terminal for comparing comparator U2 in output circuit (4), another way
It is output to and compares in output circuit (4) relatively after the split-phase delays the second proportion resistor network in circuit (3) to divide
The inverting input terminal of device U2, 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 letter of variation
Number, export low level；
When explosibility test is opened and closed using safety spark experimental rig G, two electrodes of safety spark experimental rig G by
Closure is initially separated, and the loop current due to needing to detect the inductive circuit (1) that inductance disconnects electric arc start/stop time cannot be mutated,
Cause breakpoint that voltage jump occurs, the inductive circuit (1) for needing to detect inductance disconnection electric arc start/stop time starts to generate electric arc
Electric discharge；The voltage of voltage signal processing circuit (2) output is divided into two-way, delays the in circuit (3) by the split-phase all the way
The non-inverting input terminal for comparing comparator U2 in output circuit (4) is output to after one proportion resistor network partial pressure, another way passes through institute
It states to be output to after split-phase delays the second proportion resistor network in circuit (3) to divide and compares comparator U2 in output circuit (4)
Inverting input terminal, although the resistance value of resistance R5, the resistance value of resistance R6, the resistance value of the resistance value of resistance R7 and resistance R8 meet relational expressionBut the change of the voltage exported after having delayed the second proportion resistor network to divide due to capacitor C1
Change, so that the voltage of the non-inverting input terminal of comparator U2 is greater than the voltage of its inverting input terminal, comparator U2 exports high level, by
It is rising edge triggering in d type flip flop U3, therefore, d type flip flop U3 exports high level；D type flip flop U3 is started to export high level
Moment is recorded as inductance and disconnects electric arc initial time；
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 of voltage signal processing circuit (2) output is divided into two-way,
It is output to and compares in output circuit (4) after the split-phase delays the first proportion resistor network in circuit (3) to divide all the way
The non-inverting input terminal of comparator U2, another way is after the split-phase delays the second proportion resistor network in circuit (3) to divide
It is 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 resistance R6, electricity
The resistance value of the resistance value and resistance R8 that hinder R7 meets relational expressionTherefore the non-inverting input terminal of comparator U2
Voltage is less than the voltage of its inverting input terminal, and 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, at this point,
Two electrodes of safety spark experimental rig G are completely separated, and need to detect the inductive circuit (1) that inductance disconnects electric arc start/stop time
The voltage signal of a mutation is produced again, and the voltage of voltage signal processing circuit (2) output is divided into two-way, passes through institute all the way
It states to be output to after split-phase delays the first proportion resistor network in circuit (3) to divide and compares comparator U2 in output circuit (4)
Non-inverting input terminal, another way is output to after the split-phase delays the second proportion resistor network in circuit (3) to divide to be compared
The inverting input terminal of comparator U2 in output circuit (4), although the resistance value of the resistance value of resistance R5, the resistance value of resistance R6, resistance R7
Meet relational expression with the resistance value of resistance R8But since capacitor C1 has delayed the second proportion resistor net
The variation of voltage exported after network partial pressure so that comparator U2 exports high level again, d type flip flop U3 detect this from as low as
The voltage signal of High variation, the overturning of output state logic are low level, need to detect the inductance that inductance disconnects electric arc start/stop time
Circuit (1) arc discharge terminates；Inductance is recorded as at the time of the output logic state overturning of d type flip flop U3 is generated failing edge to break
Open electric arc end time.
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