CN106597344A - Short circuit current calibration circuit of spark test device - Google Patents
Short circuit current calibration circuit of spark test device Download PDFInfo
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- CN106597344A CN106597344A CN201611260312.1A CN201611260312A CN106597344A CN 106597344 A CN106597344 A CN 106597344A CN 201611260312 A CN201611260312 A CN 201611260312A CN 106597344 A CN106597344 A CN 106597344A
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- calibration
- circuit
- demarcation
- short circuit
- switch
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a short circuit current calibration circuit of a spark test device. The circuit comprises a calibration selection switch connected to a calibration power supply and a calibration parameter selection circuit connected to the calibration selection switch. The calibration parameter selection circuit comprises N calibration resistors which are connected to contact points of the calibration selection switch respectively. A calibration switch is connected to each calibration resistor. Two ends of the calibration switch are taken as calibration current output terminals. And the N is greater than 4. Compared to the prior art, in an embodiment of the invention, more short circuit current calibration parameters can be provided so that a step length among the short circuit current calibration parameters is shortened and calibration precision is increased.
Description
Technical field
The present invention relates to spark test apparatus technical field, the short circuit current mark of more particularly to a kind of spark test apparatus
Determine circuit.
Background technology
With industrial and mining establishment such as oil, chemical industry, collieries, in process of production mechanization, the flourishing of electrified and automatization are sent out
Exhibition, the Explosion-Proof for being applied to the electrical equipment of explosion risk environment becomes increasingly conspicuous.Intrinsicallysafe electrical apparatus is due to being
Ensure explosion-proof on the electric parameter of circuit, there are many particular advantages relative to other types of electric apparatus for explosive atmospheres,
Therefore at oil, chemical industry scene, the measuring instrument of the inferior dangerous place with a potential explosion of coal mine, communicating and the aspect such as automatically control must
Increasingly extensive application is arrived.
For the test of the security performance of intrinsicallysafe electrical apparatus is carried out generally on spark test apparatus.Fig. 1 is
The short circuit current Calibration Circuit figure of spark test apparatus of the prior art.As shown in figure 1, the short circuit current of spark test apparatus
Calibration Circuit arranges demarcation selecting switch SW1, and demarcation selecting switch SW1 has 4 different switch contacts, joins with demarcating
Resistance R1, resistance R2, resistance R3 and resistance R4 connections in number selection circuit 1, corresponds to respectively a kind of short circuit current calibrating parameters.
Wherein, the corresponding Calibrated currents of R1 are 110mA, and the corresponding Calibrated currents of R2 are 100mA, and the corresponding Calibrated currents of R3 are 65mA,
The corresponding Calibrated currents of R4 are 30mA.
As can be seen here, the short circuit current calibrating parameters that short circuit current Calibration Circuit of the prior art can be provided are less,
Step-length between each short circuit current calibrating parameters is larger, causes the demarcation of short circuit current not fine enough, and the precision of demarcation is relatively low.
As can be seen here, disadvantages mentioned above of the prior art how is overcome to be those skilled in the art's problem demanding prompt solution.
The content of the invention
It is an object of the invention to provide a kind of short circuit current Calibration Circuit of spark test apparatus, for overcoming prior art
In short circuit current Calibration Circuit provide short circuit current calibrating parameters it is less, the step-length between each short circuit current calibrating parameters
It is larger, and the demarcation of caused short circuit current is not fine enough, the poor problem of precision.
To solve above-mentioned technical problem, the present invention provides a kind of short circuit current Calibration Circuit of spark test apparatus, including
The demarcation selecting switch being connected with demarcation power supply, the calibrating parameters selection circuit being connected with the demarcation selecting switch, the mark
Parameter selection circuit is determined including N number of demarcation resistance, respectively with the contact portion of the demarcation selecting switch, calibration switch and each institute
Demarcation resistance connection is stated, used as Calibrated current outfan, N is more than 4 at the two ends of the calibration switch.
Preferably, also including single-chip microcomputer, the human-computer interaction device for being input into calibrating parameters being connected with the single-chip microcomputer,
With single-chip microcomputer connection for according to the automatically controlled rheostat of the calibrating parameters corresponding resistance of output, with the automatically controlled change
Resistance device and the mode selection switch for selecting manual mode and automatic mode of demarcation selecting switch connection, the pattern
Selecting switch is connected with the demarcation power supply.
Preferably, the demarcation trimming circuit being connected with the single-chip microcomputer is also included.
Preferably, the sample circuit of the electric current for the Calibrated current outfan of sampling also is included.
Preferably, also including calibration indicating circuit, wherein, the calibration switch is ganged switch, and the school is controlled respectively
Quasi- indicating circuit and the calibrating parameters selection circuit.
Preferably, the automatically controlled rheostat include metal-oxide-semiconductor, first resistor, second resistance, 3rd resistor, the first electric capacity and
PNP triode；
Wherein, the grid of the metal-oxide-semiconductor is connected with the single-chip microcomputer, the drain electrode of the metal-oxide-semiconductor and the first resistor
The first end connection of first end and the second resistance, the second end of the first resistor and the demarcation selecting switch and described
The first end connection of 3rd resistor, first end and the PNP tri- pole of the second end of the second resistance with first electric capacity
The base stage connection of pipe, the second end of first electric capacity and the source electrode of the metal-oxide-semiconductor are connected with the negative pole of the demarcation power supply, institute
State the emitter stage of PNP triode to be connected with the second end of the 3rd resistor, the colelctor electrode of the PNP triode is used as the mark
Determine current output terminal.
Preferably, the demarcation trimming circuit includes the second electric capacity, slide rheostat and the 3rd electric capacity；
Wherein, the first end of second electric capacity is connected with the control end of the single-chip microcomputer and the slide rheostat, institute
The second end for stating the second electric capacity is connected with the first end of the slide rheostat, the second end of the slide rheostat and described
The first end of three electric capacity is connected with power supply, the second end ground connection of the 3rd electric capacity.
Preferably, the sample circuit includes sampling resistor and voltmeter.
Preferably, the calibration indicating circuit includes light emitting diode and the 4th resistance.
Preferably, N is 11.
The short circuit current Calibration Circuit of spark test apparatus provided by the present invention, including the demarcation being connected with demarcation power supply
Selecting switch, the calibrating parameters selection circuit being connected with demarcation selecting switch, calibrating parameters selection circuit includes N number of demarcation electricity
Resistance, respectively with the contact portion for demarcating selecting switch, calibration switch is connected with each demarcation resistance, and the two ends of calibration switch are used as mark
Determine current output terminal, N is more than 4.As can be seen here, it is relative with prior art for, more short circuits can be provided in the present embodiment
Calibration with current signal parameter, so that the step-length between short circuit current calibrating parameters shortens, improves the precision of demarcation.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention, the accompanying drawing to be used needed for embodiment will be done simply below
Introduce, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ordinary skill people
For member, on the premise of not paying creative work, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is the short circuit current Calibration Circuit figure of spark test apparatus of the prior art；
A kind of corresponding structure chart of short circuit current Calibration Circuit of spark test apparatus that Fig. 2 is provided for inventive embodiments；
The corresponding structure of short circuit current Calibration Circuit of another kind of spark test apparatus that Fig. 3 is provided for inventive embodiments
Figure；
Fig. 4 is the corresponding circuit diagrams of Fig. 3.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this
Embodiment in invention, those of ordinary skill in the art are not under the premise of creative work is made, and what is obtained is every other
Embodiment, belongs to the scope of the present invention.
The core of the present invention is to provide a kind of short circuit current Calibration Circuit of spark test apparatus.
In order that those skilled in the art more fully understand the present invention program, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
A kind of corresponding structure chart of short circuit current Calibration Circuit of spark test apparatus that Fig. 2 is provided for inventive embodiments.
The short circuit current Calibration Circuit of spark test apparatus includes and demarcates demarcation selecting switch SW1 that power supply 2 is connected, selects with demarcating
The calibrating parameters selection circuit 1 of switch SW1 connections, calibrating parameters selection circuit 1 includes N number of demarcation resistance (R1-R11), respectively
With demarcate selecting switch SW1 contact portion, calibration switch S with it is each demarcation resistance (R1-R11) be connected, the two ends of calibration switch S
Used as Calibrated current outfan, N is more than 4.
It should be noted that the quantity of the demarcation resistance in the present embodiment in calibrating parameters selection circuit 1 is more than 4, as
Preferred embodiment, N is 11 to one kind.It is understood that N is a kind of specific form of expression for 11, it is not essential however to
It is a kind of specific application scenarios for 11, i.e. Fig. 2.Here the scope of Calibrated current is 110mA-20mA.
When demarcating, calibration switch S is closed so that each resistance of demarcating is formed normally in the case of the corresponding closing of contact
Loop, then select closure to demarcate corresponding contact in selecting switch SW1 according to the demand of demarcation, so can be carried out essence
The spark-testing of safety circuit and research.Due to including 11 demarcation resistance in calibrating parameters selection circuit 1 in the present embodiment,
Therefore, it can shorten the step-length between short circuit current calibrating parameters, so that in once complete calibration process, Neng Gouti
For the short circuit current calibrating parameters compared with multiple types.It is understood that step-length between short circuit current calibrating parameters arrange more
Short, then the precision demarcated is higher, however it is necessary that the number of times of operation also can increase accordingly.In addition, respectively demarcating how resistance is chosen
Can be selected according to the size of actual Calibrated current, the present embodiment is repeated no more.
The short circuit current Calibration Circuit of the spark test apparatus that the present embodiment is provided, including the demarcation being connected with demarcation power supply
Selecting switch, the calibrating parameters selection circuit being connected with demarcation selecting switch, calibrating parameters selection circuit includes N number of demarcation electricity
Resistance, respectively with the contact portion for demarcating selecting switch, calibration switch is connected with each demarcation resistance, and the two ends of calibration switch are used as mark
Determine current output terminal, N is more than 4.As can be seen here, it is relative with prior art for, more short circuits can be provided in the present embodiment
Calibration with current signal parameter, so that the step-length between short circuit current calibrating parameters shortens, improves the precision of demarcation.
On the basis of above-described embodiment, although improve the precision of demarcation, but due to needing multi-pass operation to demarcate choosing
Switch SW1 is selected, therefore causes the workload of testing crew very loaded down with trivial details, the efficiency for making test is substantially reduced.In addition, above-mentioned enforcement
Although the precision of example increases, but determines once demarcating resistance, then can only be a kind of calibrating parameters of fixation, not enough spirit
It is living.Problem in terms of in view of above-mentioned two, hereinafter will be overcome by another technical scheme.
The corresponding structure of short circuit current Calibration Circuit of another kind of spark test apparatus that Fig. 3 is provided for inventive embodiments
Figure.As shown in figure 3, on the basis of above-described embodiment, also including single-chip microcomputer 3, what is be connected with single-chip microcomputer 3 demarcates ginseng for input
Several human-computer interaction devices 4, the automatically controlled rheostat 5 for the foundation calibrating parameters corresponding resistance of output with the connection of single-chip microcomputer 3,
The mode selection switch for selecting manual mode and automatic mode being connected with automatically controlled rheostat 5 and demarcation selecting switch SW1
K1, mode selection switch K1 are connected with power supply 2 is demarcated.
In being embodied as, human-computer interaction device 4 includes keyboard and USB interface, for being input into various calibrating parameters and leading
Enter data, it is to be understood that needs carry out programming to single-chip microcomputer 3 in advance, and the present embodiment is repeated no more.In addition, demarcating
Selecting switch SW1 can adopt band switch, for example, if N is 11, then can select 11 grades of band switches.Pattern is selected
Selecting switch K1 is used to select manual mode and automatic mode, as shown in figure 3, mode selection switch K1 is when upper, then present mode
For manual mode, that is, it is manually operated and demarcates the demarcation that selecting switch SW1 realizes parameters, if mode selection switch K1
When under, then present mode is automatic mode, i.e., control automatically controlled rheostat 5 to realize by single-chip microcomputer 3, in being embodied as,
Single-chip microcomputer 3 can select STC15W408AS single-chip microcomputers.
For more clear technical scheme provided in an embodiment of the present invention, Fig. 4 is given.Fig. 4 is the corresponding circuit diagrams of Fig. 3.
Three ports of single-chip microcomputer 3 are respectively AD simulation inputs P1.2 port, automatically controlled variable resistance control P2.0 ports and input port.Pass through
The |input paramete control single chip computer 3 of human-computer interaction device 4, such that it is able to subtly be input into the short circuit current to be controlled ginseng is demarcated
Count, its short circuit current that can be demarcated is：0mA -120mA, by 1mA steppings (if necessary can be by 0.1mA steppings)；By list
The automatically controlled variable resistance control P2.0 ports of piece machine 3, control automatically controlled rheostat 5 so that automatically controlled rheostat 5 exports different resistances, reaches
To with manual mode identical effect.By increasing a kind of automatic mode so that this device can realize simultaneously manual mode and
Automatic mode, in automatic mode, can reduce workload without the need for manual operation, and may also operate as the effect of redundancy.
A kind of implementation of automatically controlled rheostat 5 is as shown in figure 4, including metal-oxide-semiconductor T1, first resistor R14, second resistance
R15,3rd resistor R13, the first electric capacity C3 and PNP triode T2.
Wherein, the grid of metal-oxide-semiconductor T1 is connected with single-chip microcomputer, the drain electrode of metal-oxide-semiconductor T1 and the first end of first resistor R14 and the
The first of the first end connection of two resistance R15, the second end of first resistor R14 and demarcation selecting switch K1 and 3rd resistor R13
End connection, the second end of second resistance R15 is connected with the first end of the first electric capacity C3 and the base stage of PNP triode T2, and first is electric
Hold second end of C3 and the source electrode of metal-oxide-semiconductor T1 is connected with the negative pole for demarcating power supply, the emitter stage and 3rd resistor of PNP triode T2
The second end connection of R13, the colelctor electrode of PNP triode T2 is used as Calibrated current outfan.
Single-chip microcomputer 3 controls the grid voltage of metal-oxide-semiconductor T1, and specifically single-chip microcomputer 3 is by P2.0 ports output pwm signal, Jing
Metal-oxide-semiconductor T1 amplifies, then Jing after R15, C3 integration, controls the internal resistance of audion T2, completes the Fine calibration of short circuit current.
On the basis of above-described embodiment, also include the demarcation trimming circuit 6 being connected with single-chip microcomputer 3.
Demarcating trimming circuit 6 includes the second electric capacity C1, slide rheostat VR1 and the 3rd electric capacity C2；
Wherein, the first end of the second electric capacity C2 is connected with the control end of single-chip microcomputer 3 and slide rheostat VR1, the second electric capacity
Second end of C1 is connected with the first end of slide rheostat VR1, second end of slide rheostat VR1 and the first of the 3rd electric capacity C2
End is connected with power supply+5V, the second end ground connection of the 3rd electric capacity C2.
Wherein, C1 and C2 is used to remove the interference in circuit, in addition, by adjusting VR1, can demarcate manual fine-tuning online
Parameter.When the control algolithm for changing single-chip microcomputer 3, VR1 can also complete the continuous demarcation of digital manual simulation, and the present embodiment is no longer gone to live in the household of one's in-laws on getting married
State.In addition, the also also available horsepower metal-oxide-semiconductor replacement of PNP triode T2.
Alternatively preferred embodiment, the sampling electricity of the electric current for Calibrated current outfan of sampling also is included
Road 7.
As shown in figure 4, sample circuit 7 includes sampling resistor R12 and voltmeter.
The first end of sampling resistor 12 is connected with each demarcation resistance and the colelctor electrode of PNP triode T2, the second end and school
Quasi- switch S connections, the electric current for flowing through sampling resistor R12 is exactly Calibrated current, is connected by voltmeter and sampling resistor R12 two ends
Connect, the voltage of sampling resistor R12 can be obtained, and the resistance of sampling resistor R12 is known, it is possible to calculate demarcation electricity
Stream.
Alternatively preferred embodiment, also including calibration indicating circuit 8, wherein, calibration switch S is opened for duplex
Close, respectively control calibration indicating circuit 8 and calibrating parameters selection circuit 1.
In one kind is embodied as, calibration indicating circuit 8 includes light emitting diode D and the 4th resistance R16.May be appreciated
It is that calibration indicates that lamp driver 8 can also adopt its indicating mode, such as buzzer, or the group of buzzer and light emitting diode
Close, the present embodiment is repeated no more.
The short circuit current Calibration Circuit of spark test apparatus provided by the present invention is described in detail above.Explanation
Each embodiment is described by the way of progressive in book, what each embodiment was stressed be it is different from other embodiment it
Place, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment, due to itself and reality
Apply that method disclosed in example is corresponding, so description is fairly simple, related part is referring to method part illustration.Should refer to
Go out, for those skilled in the art, under the premise without departing from the principles of the invention, can also be to the present invention
Some improvement and modification are carried out, these are improved and modification is also fallen in the protection domain of the claims in the present invention.
Claims (10)
1. the short circuit current Calibration Circuit of a kind of spark test apparatus, it is characterised in that include and demarcate the demarcation that power supply is connected
Selecting switch, the calibrating parameters selection circuit being connected with the demarcation selecting switch, the calibrating parameters selection circuit includes N number of
Resistance is demarcated, respectively with the contact portion of the demarcation selecting switch, calibration switch is connected with each demarcation resistance, the school
The two ends of quasi- switch are more than 4 as Calibrated current outfan, N.
2. the short circuit current Calibration Circuit of spark test apparatus according to claim 1, it is characterised in that also including monolithic
Machine, the human-computer interaction device for being input into calibrating parameters being connected with the single-chip microcomputer, be connected with the single-chip microcomputer for according to
The automatically controlled rheostat of corresponding resistance is exported according to the calibrating parameters, is connected with the automatically controlled rheostat and the demarcation selecting switch
The mode selection switch for selecting manual mode and automatic mode for connecing, the mode selection switch connects with the demarcation power supply
Connect.
3. the short circuit current Calibration Circuit of spark test apparatus according to claim 2, it is characterised in that also include and institute
State the demarcation trimming circuit of single-chip microcomputer connection.
4. the short circuit current Calibration Circuit of spark test apparatus according to claim 2, it is characterised in that also include for
Sample the Calibrated current outfan electric current sample circuit.
5. the short circuit current Calibration Circuit of spark test apparatus according to claim 2, it is characterised in that also including calibration
Indicating circuit, wherein, the calibration switch is ganged switch, and the calibration indicating circuit and calibrating parameters choosing are controlled respectively
Select circuit.
6. the short circuit current Calibration Circuit of spark test apparatus according to claim 2, it is characterised in that the automatically controlled change
Resistance device includes metal-oxide-semiconductor, first resistor, second resistance, 3rd resistor, the first electric capacity and PNP triode；
Wherein, the grid of the metal-oxide-semiconductor is connected with the single-chip microcomputer, the drain electrode of the metal-oxide-semiconductor and the first of the first resistor
The first end connection of end and the second resistance, the second end of the first resistor and the demarcation selecting switch and the described 3rd
The first end connection of resistance, the first end of the second end of the second resistance and first electric capacity and the PNP triode
Base stage connects, and the second end of first electric capacity and the source electrode of the metal-oxide-semiconductor are connected with the negative pole of the demarcation power supply, described
The emitter stage of PNP triode is connected with the second end of the 3rd resistor, and the colelctor electrode of the PNP triode is used as the demarcation
Current output terminal.
7. the short circuit current Calibration Circuit of spark test apparatus according to claim 3, it is characterised in that the demarcation is micro-
Circuit is adjusted to include the second electric capacity, slide rheostat and the 3rd electric capacity；
Wherein, the first end of second electric capacity is connected with the control end of the single-chip microcomputer and the slide rheostat, and described
Second end of two electric capacity is connected with the first end of the slide rheostat, the second end of the slide rheostat and described 3rd electric
The first end of appearance is connected with power supply, the second end ground connection of the 3rd electric capacity.
8. the short circuit current Calibration Circuit of spark test apparatus according to claim 4, it is characterised in that the sampling electricity
Road includes sampling resistor and voltmeter.
9. the short circuit current Calibration Circuit of spark test apparatus according to claim 5, it is characterised in that the calibration refers to
Show that circuit includes light emitting diode and the 4th resistance.
10. the short circuit current Calibration Circuit of the spark test apparatus according to claim 1 to 9 any one, its feature exists
In N is 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611260312.1A CN106597344A (en) | 2016-12-30 | 2016-12-30 | Short circuit current calibration circuit of spark test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611260312.1A CN106597344A (en) | 2016-12-30 | 2016-12-30 | Short circuit current calibration circuit of spark test device |
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| Publication Number | Publication Date |
|---|---|
| CN106597344A true CN106597344A (en) | 2017-04-26 |
Family
ID=58581633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611260312.1A Pending CN106597344A (en) | 2016-12-30 | 2016-12-30 | Short circuit current calibration circuit of spark test device |
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| Country | Link |
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| CN (1) | CN106597344A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110749848A (en) * | 2019-09-25 | 2020-02-04 | 西安航天计量测试研究所 | Current parameter calibration system and method based on current channel switching instrument |
| CN111121612A (en) * | 2020-01-02 | 2020-05-08 | 北方工业大学 | Method for identifying surface scratch depth of cadmium disc of spark test device |
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| CN203745636U (en) * | 2014-03-23 | 2014-07-30 | 孙旭松 | Virtual oscilloscope calibration circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110749848A (en) * | 2019-09-25 | 2020-02-04 | 西安航天计量测试研究所 | Current parameter calibration system and method based on current channel switching instrument |
| CN111121612A (en) * | 2020-01-02 | 2020-05-08 | 北方工业大学 | Method for identifying surface scratch depth of cadmium disc of spark test device |
| CN111121612B (en) * | 2020-01-02 | 2021-08-24 | 北方工业大学 | Method for identifying surface scratch depth of cadmium disc of spark test device |
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