CN109669067A - Multi-channel high-accuracy electric current dynamic realtime detection device - Google Patents
Multi-channel high-accuracy electric current dynamic realtime detection device Download PDFInfo
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- CN109669067A CN109669067A CN201910159496.XA CN201910159496A CN109669067A CN 109669067 A CN109669067 A CN 109669067A CN 201910159496 A CN201910159496 A CN 201910159496A CN 109669067 A CN109669067 A CN 109669067A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
Abstract
The present invention relates to a kind of multi-channel high-accuracy electric current dynamic realtime detection devices, including current sampling module, first judgment module, Current Voltage conversion module, the second judgment module, blocking module, processing module and computer module；Current sampling module obtains the first sampled current value, first judgment module obtains the Current Voltage conversion module that the second sampled current value is sent to peer-level after judging the first sampled current value, Current Voltage conversion module is sent to the second judgment module after the second sampled current value is converted to the first sample voltage value, second judgment module obtains the second sample voltage value and is sent to block module and processing module after the first sample voltage value is compared with the voltage domain range prestored, make part of module short-circuit after blocking module to receive the second sample voltage value, processing module, which handles the second sample voltage value, obtains test current value to obtain test voltage value and be sent to after computer module, it is simple and easy to operate.
Description
Technical field
The present invention relates to a kind of multi-channel high-accuracy electric current dynamic realtime detection device, belongs to Industry Control and test is led
Domain.
Background technique
In current measurement and control area, the testing current on the testing scheme of electric current generally for uA, mA and A grades is used
The electric current measuring and controlling equipment of different ranges and precision carries out observing and controlling, and the detection if necessary to gamut then needs manually different
Switching and rigid line switching between equipment, the program for being used to record data are also required to be called equipment switching.Current inspection
Measurement equipment exists following insufficient:
1), needed when testing current according to estimation actual value may range, and need to connect corresponding equipment and carry out
Precise measurement；
2), the signal-under-test bigger for current fluctuation can not monitor in real time；
3), the signal measurement bigger for fluctuation range needs to carry out equipment hard handover；
4) channel, can only once be measured；
5), measurement cost is very high.
Summary of the invention
The purpose of the present invention is to provide one kind gamut measurement and can monitor in real time and fluctuate between different stage
Electric current, and the multi-channel high-accuracy electric current dynamic realtime detection device that structure is simple and convenient to operate.
In order to achieve the above objectives, the invention provides the following technical scheme: a kind of multi-channel high-accuracy electric current dynamic realtime is examined
Measurement equipment, the equipment include current sampling module, first judgment module, several Current Voltage conversion modules, the second judgement
Module, several blocking module, processing module and computer modules；Wherein, the current sampling module carries out operating current
Sampling obtains the first sampled current value, and first sampled current value is sent to the first judgment module, and described first
Judgment module receives first sampled current value and by first sampled current value and the current value of different stage that prestores
Domain range obtains the second sampled current value after being compared, second sampled current value is sent to the electric current of corresponding rank
Voltage transformation module, the Current Voltage conversion module receive second sampled current value and by second sampled current values
It is sent to second judgment module after being converted to the first sample voltage value, second judgment module receives first sampling
Simultaneously first sample voltage value is compared described in determination with the voltage domain range of the different stage prestored for voltage value
The second sample voltage value is obtained after the rank of first sample voltage value, and second sample voltage value is sent to and meets rank
Make part of module short-circuit after blocking module and processing module, the blocking module to receive second sample voltage value, it is described
Processing module receives second sample voltage value and carries out linear process to second sample voltage value to obtain test electricity
The test voltage value is sent to the computer module by pressure value, and the computer module receives the test voltage value simultaneously
The test voltage value is converted into test current value according to reduction formula.
Further, several described Current Voltage conversion modules include first order Current Voltage conversion module, the second level
Current Voltage conversion module and third level Current Voltage conversion module, the first order Current Voltage conversion module are adopted including first
Sample resistance, the Standard resistance range of first sampling resistor are 0.01-0.1 Ω；The second level Current Voltage conversion module includes
Second sampling resistor, the Standard resistance range of second sampling resistor are 0.1-1 Ω；The third level Current Voltage conversion module packet
Third sampling resistor is included, the Standard resistance range of the third sampling resistor is 1-10 Ω.
Further, the blocking module includes that the first order connecting with the second level Current Voltage conversion module blocks
Module and the second level connecting with the third level Current Voltage conversion module block module；The first order blocks module packet
Include the first field-effect tube being connect with the second sampling resistor, the first linear amplifier being connect with first field-effect tube and with
The first instrument amplifier of the first linear amplifier connection, it includes connecting with third sampling resistor that the second level, which blocks module,
The second field-effect tube for connecing, the second linear amplifier being connect with second field-effect tube and with second linear amplifier
The second instrument amplifier of connection.
Further, the processing module includes for amplifying second sample voltage value and sampling electricity for described second
Pressure value is converted to the third linear amplifier of test voltage value and the voltage data acquisition for collecting the test voltage value
Card.
Further, the computer module includes industrial control computer, and the industrial control computer is adopted with the voltage data
Truck passes through USB connection.
Further, the multi-channel high-accuracy electric current dynamic realtime detection device further includes sentencing for connecting described second
The amplification module of disconnected module and processing module, the amplification module are sent to the place after amplifying second sample voltage value
Manage module.
The beneficial effects of the present invention are: by being provided with first judgment module with judge the first sampled current value rank from
And the Current Voltage conversion module that the first sampled current value is sent to appropriate level is subjected to conversion process to obtain the first sampling
Voltage value, then the rank of the first sample voltage value is judged by the way that the second judgment module is arranged to obtain the second sampled voltage
Value, and the second sample voltage value is sent to the blocking module and processing module for meeting level conditions simultaneously, block module to receive
Second sample voltage value makes part of module short circuit so that not short-circuit module works on and by the second sample voltage value
Processing is the first test voltage value, and test voltage value is converted to test current value according to reduction formula by last computer module,
Achieve the effect that distinguish current level and real-time monitoring and measurement different stage electric current, structure are simple and easy to operate.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of multi-channel high-accuracy electric current dynamic realtime detection device of the invention.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
Referring to Figure 1, the multi-channel high-accuracy electric current dynamic realtime detection device packet in a preferred embodiment of the invention
Include current sampling module 1, first judgment module 2, several Current Voltage conversion modules 3, the second judgment module 4, several resistances
Disconnected module 5, processing module 7 and computer module 8.
The current sampling module 1 carries out sampling to operating current and obtains the first sampled current value, and described first is adopted
Sample current value is sent to the first judgment module 2, and the first judgment module 2 receives first sampled current value and by institute
It states after the first sampled current value is compared with the electric current codomain range of the different stage prestored and obtains the second sampled current value, it will
Second sampled current value is sent to the Current Voltage conversion module 3 of corresponding rank, and the Current Voltage conversion module 3 connects
It receives second sampled current value and is sent to described after second sampled current value is converted to the first sample voltage value
Two judgment modules 4, second judgment module 4 receive first sample voltage value and by first sample voltage values and in advance
The voltage domain range for the different stage deposited is compared to obtain second after the rank of determination first sample voltage value and adopt
Second sample voltage value is sent to the blocking module 5 and processing module 7 for meeting rank, the blocking mould by sample voltage value
Block 5 makes part of module short-circuit after receiving second sample voltage value.In the present embodiment, the voltage value and range are distinguished
Range of voltage values for the first order, the second level and the third level, series is successively successively decreased.When the first sample voltage value is greater than the second level
When, then the second sample voltage value is sent to the first blocking module 5 and second simultaneously and blocks module 5.
The processing module 7 receives second sample voltage value and carries out linear process to second sample voltage value
To obtain test voltage value, the test voltage value is sent to the computer module 8, the computer module 8 receives institute
It states test voltage value and the test voltage value is converted to by test current value according to reduction formula.In the present embodiment, described
Conversion method specifically: the size of tested electric current is conversed by known sampling resistor value and certain amplification factor relationship.
In the present embodiment, the level range of first sampled current value includes uA grades, mA grades and three ranks of A grade.
Correspondingly, several described Current Voltage conversion modules 3 include first order Current Voltage conversion module 31, second level Current Voltage
Conversion module 32 and third level Current Voltage conversion module 33, the first order Current Voltage conversion module 31 are used for A grades of electricity
Stream is converted, and the second level Current Voltage conversion module 32 is for converting mA grades of electric currents, the third level electric current
Voltage transformation module 33 is for converting uA grades of electric currents.
The first order Current Voltage conversion module 31 includes the first sampling resistor, the resistance value model of first sampling resistor
It encloses for 0.01-0.1 Ω；The second level Current Voltage conversion module 32 includes the second sampling resistor, second sampling resistor
Standard resistance range be 0.1-1 Ω；The third level Current Voltage conversion module 33 includes third sampling resistor, the third sampling
The Standard resistance range of resistance is 1-10 Ω.Really, in other embodiments, the Current Voltage conversion module 3 may include other
The Standard resistance range of level block, sampling resistors at different levels can not also do specific limit depending on Book of Songs situation for other herein
It is fixed.
Correspondingly, the blocking module 5 includes the first order resistance connecting with the second level Current Voltage conversion module 32
Disconnected module 51 and the second level connecting with the third level Current Voltage conversion module 33 block module 52, i.e. multichannel is high-precision
Spending electric current dynamic realtime detection device includes n Current Voltage conversion module 3, then it just includes n-1 blocking module 5.It is described
Blocking module 5 includes the first order blocking module 51 connect with the second level Current Voltage conversion module 32 and with described the
The second level that tertiary current voltage transformation module 33 connects blocks module 52；It includes adopting with second that the first order, which blocks module 51,
First field-effect tube of sample resistance connection, the first linear amplifier for being connect with first field-effect tube and with the First Line
Property amplifier connection first instrument amplifier, it includes second connect with third sampling resistor that the second level, which blocks module 52,
Field-effect tube, the second linear amplifier being connect with second field-effect tube and connect with second linear amplifier
Two instrument amplifiers.In view of the resistance value of uA grades and mA grades of third sampling resistors and the second sampling resistor is bigger, uA grades
The resistance value of third sampling resistor may select in 10 Europe or so, and in measurement series relationship inside circuit, so in reality
When testing larger current other than the first sampling resistor itself, third sampling resistor can generate high voltage, high power consumption and high fever
Amount even the problem of burning, introducing field-effect tube then is being more than that will do it the second sampling resistor and third sampling electricity after specific currents
The short circuit of resistance, the short circuit resistance of MOS field effect transistor only have bold and unconstrained Europe grade, so that its high current is carried out direct be shorted by field-effect tube and are protected
Shield is to avoid the damage of the second sampling resistor and third sampling resistor.
The processing module 7 includes for amplifying second sample voltage value and converting second sample voltage value
Voltage data capture card for the third linear amplifier of test voltage value and for collecting the test voltage value.In this reality
It applies in example, the computer module 8 includes industrial control computer, and the industrial control computer passes through with the voltage data capture card
USB connection.It is worth noting that, the multi-channel high-accuracy electric current dynamic realtime detection device power of test of the present embodiment depends on
The data channel number of voltage data capture card, it is assumed that in the case that voltage data capture card has the data acquisition ability in 30 channels,
The ability of the gamut electric current in 10 channels can then be detected simultaneously (each sense channel occupies 3 data acquisition channels).
The multi-channel high-accuracy electric current dynamic realtime detection device further include for connect second judgment module 4 and
The amplification module 6 of processing module 7, the amplification module 6 are sent to the processing mould after amplifying second sample voltage value
Block 7.Correspondingly, the amplification module 6 includes the third instrument amplifier connecting with the first sampling resistor and second sampling
4th instrument amplifier of resistance connection and the 5th instrument amplifier being connect with the third sampling resistor.
Implementation process of the invention are as follows: current sampling module 1 carries out sampling to operating current and obtains the first sampled current value,
And first sampled current value is sent to the first judgment module 2, the first judgment module 2 judges that described first adopts
Sample current value is uA grades or mA grades or A grades.
If first sampled current value is A grades, then the first sampled current value of A grade is referred to as the second sampled current value, the
Second sampled current value is sent to first order Current Voltage conversion module 31 and carries out voltage to it by one judgment module 2 to be turned
It changes and obtains the first sample voltage value and be sent to the second judgment module 4 and judged, second judgment module 4 is by described first
After sample voltage value is compared with the voltage domain range (i.e. the first order, the second level, the third level) of the different stage prestored, hair
Existing first sample voltage value falls into first order codomain range, then voltage value at this time is become the second sample voltage value, and by the
Two sample voltage values are sent to the first blocking module 51 and second and block module 52, and first blocks module 51 by the second sampling resistor
Short circuit, second blocks module by the short circuit of third sampling resistor so that operating current only passes through the first sampling resistor, and by with institute
The third instrument amplifier enhanced processing for stating the connection of the first sampling resistor, is then forwarded to the processing module 7 and computer mould
Block 8 is to obtain the test current data of final test.
If first sampled current value is mA grades, then the first sampled current value of mA grade is referred to as the second sampled current value,
Second sampled current value is sent to second level Current Voltage conversion module 32 and carries out voltage to it by first judgment module 2
Conversion obtains the first sample voltage value and is sent to the second judgment module 4 and is judged, second judgment module 4 is by described the
After one sample voltage value is compared with the voltage domain range (i.e. the first order, the second level, the third level) of the different stage prestored,
It was found that the first sample voltage value falls into second level codomain range, then voltage value at this time is become into the second sample voltage value, and will
Second sample voltage value is sent to the first blocking module 51, and first blocks module 51 by the short circuit of the second sampling resistor, then work electricity
Stream only passes through the second sampling resistor, and the 4th instrument amplifier enhanced processing by connecting with second sampling resistor, so
It is sent to the processing module 7 and computer module 8 afterwards to obtain the test current data of final test.
If first sampled current value is uA grades, then the first sampled current value of uA grade is referred to as the second sampled current value,
Second sampled current value is sent to third level Current Voltage conversion module 33 and carries out voltage to it by first judgment module 2
Conversion obtains the first sample voltage value and is sent to the second judgment module 4 and is judged, second judgment module 4 is by described the
After one sample voltage value is compared with the voltage domain range (i.e. the first order, the second level, the third level) of the different stage prestored,
It was found that the first sample voltage value falls into third level codomain range, then voltage value at this time is become into the second sample voltage value, then work
Make electric current and only pass through third sampling resistor, and at the 5th instrument amplifier amplification by being connect with the third sampling resistor
Reason, is then forwarded to the processing module 7 and computer module 8 to obtain the test current data of final test.
In summary: by being provided with first judgment module 2 to judge the first sampled current value rank to adopt first
The Current Voltage conversion module 3 that sample current value is sent to appropriate level carries out conversion process to obtain the first sample voltage value, then
The rank of the first sample voltage value is judged by the way that the second judgment module 4 is arranged to obtain the second sample voltage value, and will
Second sample voltage value is sent to the blocking module 5 and processing module 7 for meeting level conditions simultaneously, and module 5 is blocked to receive second
Sample voltage value makes part of module short circuit so that short-circuit module does not work on and handles the second sample voltage value
For the first test voltage value, test voltage value is converted to test current value according to reduction formula, reached by last computer module 8
It distinguishes current level and real-time monitoring and the effect for measuring different stage electric current, structure is simple and easy to operate.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (6)
1. a kind of multi-channel high-accuracy electric current dynamic realtime detection device, which is characterized in that the equipment includes current sample mould
Block, first judgment module, several Current Voltage conversion modules, the second judgment module, several block modules, processing module,
And computer module；Wherein, the current sampling module carries out sampling to operating current and obtains the first sampled current value, and by institute
It states the first sampled current value and is sent to the first judgment module, the first judgment module receives first sampled current value
And the second sampling electricity is obtained after first sampled current value is compared with the electric current codomain range of the different stage prestored
Second sampled current value is sent to the Current Voltage conversion module of corresponding rank, the Current Voltage conversion by flow valuve
Module receives second sampled current value and is sent to after second sampled current value is converted to the first sample voltage value
Second judgment module, second judgment module receive first sample voltage value and by first sample voltage values
It is compared with the voltage domain range of the different stage prestored to obtain after the rank of determination first sample voltage value
Second sample voltage value is sent to the blocking module and processing module for meeting rank, the blocking by two sample voltage values
Module makes part of module short-circuit after receiving second sample voltage value, and the processing module receives second sampled voltage
Value simultaneously carries out linear process to second sample voltage value to obtain test voltage value, and the test voltage value is sent to institute
Computer module is stated, the computer module receives the test voltage value and turns the test voltage value according to reduction formula
It is changed to test current value.
2. multi-channel high-accuracy electric current dynamic realtime detection device as described in claim 1, which is characterized in that described in several
Current Voltage conversion module includes first order Current Voltage conversion module, second level Current Voltage conversion module and third level electric current
Voltage transformation module, the first order Current Voltage conversion module include the first sampling resistor, the resistance of first sampling resistor
Value range is 0.01-0.1 Ω；The second level Current Voltage conversion module includes the second sampling resistor, the second sampling electricity
The Standard resistance range of resistance is 0.1-1 Ω；The third level Current Voltage conversion module includes third sampling resistor, the third sampling
The Standard resistance range of resistance is 1-10 Ω.
3. multi-channel high-accuracy electric current dynamic realtime detection device as claimed in claim 2, which is characterized in that the blocking mould
Block include the first order that is connect with the second level Current Voltage conversion module block module and with the third level Current Voltage
The second level of conversion module connection blocks module；It includes first connect with the second sampling resistor that the first order, which blocks module,
Effect pipe, the first linear amplifier being connect with first field-effect tube and connect with first linear amplifier first
Instrument amplifier, it includes the second field-effect tube connecting with third sampling resistor and described second that the second level, which blocks module,
Second linear amplifier of field-effect tube connection and the second instrument amplifier being connect with second linear amplifier.
4. multi-channel high-accuracy electric current dynamic realtime detection device as described in claim 1, which is characterized in that the processing mould
Block includes for amplifying second sample voltage value and second sample voltage value being converted to the third of test voltage value
Linear amplifier and voltage data capture card for collecting the test voltage value.
5. multi-channel high-accuracy electric current dynamic realtime detection device as claimed in claim 4, which is characterized in that the computer
Module includes industrial control computer, and the industrial control computer is connect with the voltage data capture card by USB.
6. multi-channel high-accuracy electric current dynamic realtime detection device as described in claim 1, which is characterized in that the multichannel
High-precision current dynamic realtime detection device further includes the amplification module for connecting second judgment module and processing module,
The amplification module is sent to the processing module after amplifying second sample voltage value.
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