CN105717342A - Analog quantity current input collecting system - Google Patents
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- CN105717342A CN105717342A CN201610157700.0A CN201610157700A CN105717342A CN 105717342 A CN105717342 A CN 105717342A CN 201610157700 A CN201610157700 A CN 201610157700A CN 105717342 A CN105717342 A CN 105717342A
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Abstract
The invention provides an analog quantity current input collecting system.When a transducer positive electrode interface and a transducer negative electrode interface of the analog quantity current input collecting system are connected with a non-power-distribution transducer, a first given current-limiting voltage value is received through the control end of a first current source, the first current source is connected, and then a first sampling signal is output by the first end of the first current source; a first given increment voltage value is received through the control end of a second current source, and the second current source is connected; increment of the first sampling signal is generated due to connection of the second current source, and if the increment is equal to the theoretical increment generated after the first given increment voltage value is input into the second current source, it indicates that the analog quantity current input of the analog quantity current input collecting system is free of deflection.The principle is the same when the transducer positive electrode interface and the transducer negative electrode interface are connected with a power distribution transducer.Thus, deflection self-diagnosis of analog quantity current input is achieved; in addition, the analog quantity current input collecting system only comprises the two current sources and two resistors and thus is simple in circuit formation and lower in cost than that in the prior art.
Description
Technical field
The present invention relates to current acquisition technical field, particularly relate to a kind of analog quantity electric current input acquisition system.
Background technology
Analog quantity electric current input acquisition system is widely used in industry DCS (DistributedControlSystem, Distributed Control System), industry programmable logic controller (PLC) PLC, the fields such as instrument and meter, but the analog quantity electric current of routine input acquisition system generally judges whether open circuit and short circuit only by the limit of range, self-diagnostic function without input current deviation, namely described analog quantity electric current input acquisition system cannot judge current collection value and actually enter whether there is deviation between current value, the control reliability of industry spot is produced certain hidden danger by this.
For the occasion that reliability requirement is significantly high, a kind of scheme conventional at present is multiplex redundancy acquisition scheme, for example with three-scale redundancy acquisition scheme, namely adopt three parallel Acquisition Circuit that same signaling point is acquired, obtain normal collection value again through the voting formula that the minority is subordinate to the majority, and judge that whether Acquisition Circuit is normal.
But described multiplex redundancy acquisition scheme of the prior art, owing to needing to arrange multiple parallel Acquisition Circuit so that it is circuit constitutes loaded down with trivial details, and cost significantly increases, therefore in prior art, the deviation self diagnosis of analog quantity electric current input realizes difficulty.
Summary of the invention
In view of this, the invention provides a kind of analog quantity electric current input acquisition system, to solve the problem that in prior art, the deviation self diagnosis of analog quantity electric current input realizes difficulty.
To achieve these goals, the technical scheme that the embodiment of the present invention provides is as follows:
A kind of analog quantity electric current input acquisition system, including: the first current source, the second current source, the first resistance and the second resistance；Wherein:
The end that controls of described first current source is the first control input interface that described analog quantity electric current inputs acquisition system；
The end that controls of described second current source is the second control input interface that described analog quantity electric current inputs acquisition system；
First end of described first current source is connected with one end of described first resistance, and junction point is the first acquisition interface of described analog quantity electric current input acquisition system；
The other end of described first resistance is connected with power supply；
Second end of described first current source is connected with the first end of described second current source, and junction point is the transmitter anode interface of described analog quantity electric current input acquisition system；
Second end of described second current source is connected with one end of described second resistance, and junction point is the second acquisition interface of described analog quantity electric current input acquisition system；
The other end of described second resistance is the transmitter negative pole interface of described analog quantity electric current input acquisition system, and ground connection；
When described transmitter anode interface is connected with non-distribution transmitter with described transmitter negative pole interface, described first current source is received the first given limit voltage value for controlling termination by it and turns on, and exports the first sampled signal by its first end；Described second current source is received the first given incremental voltage value for controlling termination by it and turns on；
When described transmitter anode interface is connected with distribution transmitter with described transmitter negative pole interface, described second current source is received the second given limit voltage value for controlling termination by it and turns on, and exports the second sampled signal by its second end；Described first current source is received the second given incremental voltage value for controlling termination by it and turns on.
Preferably, described first current source includes: the first operational amplifier and PMOS transistor；Wherein:
The in-phase input end of described first operational amplifier is the control end of described first current source；
The inverting input of described first operational amplifier is connected with the source electrode of described PMOS transistor, and junction point is the first end of described first current source；
The outfan of described first operational amplifier is connected with the grid of described PMOS transistor；
Second end that drain electrode is described first current source of described PMOS transistor.
Preferably, described second current source includes: the second operational amplifier and nmos pass transistor；Wherein:
The in-phase input end of described second operational amplifier is the control end of described second current source；
The inverting input of described second operational amplifier is connected with the source electrode of described nmos pass transistor, and junction point is the second end of described second current source；
The outfan of described second operational amplifier is connected with the grid of described nmos pass transistor；
First end that drain electrode is described second current source of described nmos pass transistor.
Preferably, the described first given limit voltage value, the described first given incremental voltage value, the described second given limit voltage value and the described second given incremental voltage value are analog-digital chip output.
Preferably, the described first given limit voltage value meets: V1≤VCC-I×R1, wherein, V1For the described first given limit voltage value, VCCFor described supply voltage, I is the maximum allowed current value of described analog quantity electric current input acquisition system, R1Resistance for described first resistance.
Preferably, the described first given incremental voltage value is zero.
Preferably, the described second given limit voltage value meets: V2≥I×R2, wherein, V2For the described second given limit voltage value, I is the maximum allowed current value of described analog quantity electric current input acquisition system, R2Resistance for described second resistance.
Preferably, the described second given incremental voltage value is 24V.
Preferably, described first resistance and described second resistance are precision resistance.
The application provides a kind of analog quantity electric current input acquisition system, when its transmitter anode interface is connected with non-distribution transmitter with transmitter negative pole interface, terminated by the control of the first current source and receive the first given limit voltage value and turn on, then exported the first sampled signal by the first end of described first current source；Terminated by the control of the second current source and receive the first given incremental voltage value and turn on；The conducting of described second current source makes described first sampled signal produce increment, if this increment gives produced theoretical increment after incremental voltage value is input to described second current source equal to described first, then the analog quantity electric current input zero deflection of described analog quantity electric current input acquisition system is described.When described transmitter anode interface is connected with distribution transmitter with described transmitter negative pole interface, is terminated by the control of the second current source and receive the second given limit voltage value and turn on, then exported the second sampled signal by the second end of described second current source；Terminated by the control of described first current source and receive the second given incremental voltage value and turn on；The conducting of described first current source makes described second sampled signal produce increment, if this increment gives produced theoretical increment after incremental voltage value is input to described first current source equal to described second, then the analog quantity electric current input zero deflection of described analog quantity electric current input acquisition system is described.And then achieve the deviation self diagnosis that analog quantity electric current inputs, and described analog quantity electric current input acquisition system only includes two current sources and two resistance, its circuit constitutes simple, and cost is also below prior art.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
The structural representation of a kind of analog quantity electric current input acquisition system that Fig. 1 provides for the embodiment of the present application；
The circuit diagram of the analog quantity electric current input acquisition system that Fig. 2 provides for another embodiment of the application.
Detailed description of the invention
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 clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
The invention provides a kind of analog quantity electric current input acquisition system, to solve the problem that in prior art, the deviation self diagnosis of analog quantity electric current input realizes difficulty.
Concrete, described analog quantity electric current input acquisition system, as it is shown in figure 1, include: first current source the 101, second current source the 102, first resistance R1 and the second resistance R2；Wherein:
The end that controls of the first current source 101 is the first control input interface that described analog quantity electric current inputs acquisition system；
The end that controls of the second current source 102 is the second control input interface that described analog quantity electric current inputs acquisition system；
First end of the first current source 101 and one end of the first resistance R1 are connected, and junction point is the first acquisition interface of described analog quantity electric current input acquisition system；
The other end of the first resistance R1 is connected with power supply；
Second end of the first current source 101 and the first end of the second current source 102 are connected, and junction point is the transmitter anode interface of described analog quantity electric current input acquisition system；
Second end of the second current source 102 and one end of the second resistance R2 are connected, and junction point is the second acquisition interface of described analog quantity electric current input acquisition system；
The other end of the second resistance R2 is the transmitter negative pole interface of described analog quantity electric current input acquisition system, and ground connection.
Concrete operation principle is:
When described transmitter anode interface is connected with non-distribution transmitter with described transmitter negative pole interface, the first current source 101 is received the first given limit voltage value for controlling termination by it and turns on, and exports the first sampled signal by its first end；Second current source 102 is received the first given incremental voltage value for controlling termination by it and turns on；The conducting of the second current source 102 makes described first sampled signal produce increment, if this increment gives produced theoretical increment after incremental voltage value is input to the second current source 102 equal to described first, the analog quantity electric current input zero deflection of described analog quantity electric current input acquisition system is then described, otherwise the analog quantity electric current input obtaining described analog quantity electric current input acquisition system is existed the conclusion of deviation.
When described transmitter anode interface is connected with distribution transmitter with described transmitter negative pole interface, the second current source 102 is received the second given limit voltage value for controlling termination by it and turns on, and exports the second sampled signal by its second end；First current source 101 is received the second given incremental voltage value for controlling termination by it and turns on；The conducting of the first current source 101 makes described second sampled signal produce increment, if this increment gives produced theoretical increment after incremental voltage value is input to the first current source 101 equal to described second, the analog quantity electric current input zero deflection of described analog quantity electric current input acquisition system is then described, otherwise the analog quantity electric current input obtaining described analog quantity electric current input acquisition system is existed the conclusion of deviation.
Described supply voltage in the present embodiment is shown for 24V, is not necessarily limited to this, all in the protection domain of the application.
Analog quantity electric current input acquisition system described in the present embodiment, when its transmitter anode interface is connected with non-distribution transmitter with transmitter negative pole interface, the conducting of the second current source 102 makes described first sampled signal produce increment, if this increment gives produced theoretical increment after incremental voltage value is input to the second current source 102 equal to described first, then the analog quantity electric current input zero deflection of described analog quantity electric current input acquisition system is described.When described transmitter anode interface is connected with distribution transmitter with described transmitter negative pole interface, the conducting of the first current source 101 makes described second sampled signal produce increment, if this increment gives produced theoretical increment after incremental voltage value is input to the first current source 101 equal to described second, then the analog quantity electric current input zero deflection of described analog quantity electric current input acquisition system is described.And then achieve the deviation self diagnosis that analog quantity electric current inputs, and described analog quantity electric current input acquisition system only includes two current sources and two resistance, its circuit constitutes simple, and cost is also below prior art.
What deserves to be explained is, in prior art, there is another kind of analog quantity electric current input deviation self diagnosis scheme, compare judgement for the difference of double sampling value before and after adopting, when the difference of front and back double sampling exceedes setting threshold value, illustrate that acquisition system is made mistakes.This scheme is applicable to input current and changes occasion slowly, for the occasion that input current signal own changes greatly, it is judged that threshold value is difficult to set, and easily produces false alarm, has bigger use limitation.
And the analog quantity electric current input acquisition system described in the present embodiment, for preventing described analog quantity electric current from inputting in the self diagnosis process of acquisition system, the change of its normal sampled signal causes that self diagnosis is judged by accident, after needing the described first given incremental voltage value to be input to the second current source 102, described first sampled signal collected time and the described second given incremental voltage value be input to the first current source 101 after, described second sampled signal collected time enough short, be all shorter than the transformation period of input current；Above-mentioned requirements can be reached by the parameter of two current sources and two resistance being carried out concrete setting, to avoid producing error reporting to the police.
Additionally, in concrete practical application, for eliminating the impact of other errors such as collection, described analog quantity electric current input acquisition system realizes self diagnosis when judging, certain judgement can also be reserved interval, such as when the increment of sampled signal is theoretical increment 90%～110%, all it is believed that described analog quantity electric current inputs acquisition system zero deflection working properly, otherwise it is assumed that described analog quantity electric current input acquisition system exists deviation.
Another embodiment of the present invention additionally provides another analog quantity electric current input acquisition system, as it is shown in figure 1, include: first current source the 101, second current source the 102, first resistance R1 and the second resistance R2；Wherein:
The end that controls of the first current source 101 is the first control input interface that described analog quantity electric current inputs acquisition system；
The end that controls of the second current source 102 is the second control input interface that described analog quantity electric current inputs acquisition system；
First end of the first current source 101 and one end of the first resistance R1 are connected, and junction point is the first acquisition interface of described analog quantity electric current input acquisition system；
The other end of the first resistance R1 is connected with power supply；
Second end of the first current source 101 and the first end of the second current source 102 are connected, and junction point is the transmitter anode interface of described analog quantity electric current input acquisition system；
Second end of the second current source 102 and one end of the second resistance R2 are connected, and junction point is the second acquisition interface of described analog quantity electric current input acquisition system；
The other end of the second resistance R2 is the transmitter negative pole interface of described analog quantity electric current input acquisition system, and ground connection.
Optionally, as in figure 2 it is shown, the first current source 101 includes: the first operational amplifier U1 and PMOS transistor Q1；Wherein:
The in-phase input end of the first operational amplifier U1 is the control end of the first current source 101；
The inverting input of the first operational amplifier U1 is connected with the source electrode of PMOS transistor Q1, and junction point is the first end of the first current source 101；
The outfan of the first operational amplifier U1 is connected with the grid of PMOS transistor Q1；
The drain electrode of PMOS transistor Q1 is the second end of the first current source 101.
Second current source 102 includes: the second operational amplifier U2 and nmos pass transistor Q2；Wherein:
The in-phase input end of the second operational amplifier U2 is the control end of the second current source 102；
The inverting input of the second operational amplifier U2 is connected with the source electrode of nmos pass transistor Q2, and junction point is the second end of the second current source 102；
The outfan of the second operational amplifier U2 is connected with the grid of nmos pass transistor Q2；
The drain electrode of nmos pass transistor Q2 is the first end of the second current source 102.
Optionally, the described first given limit voltage value, the described first given incremental voltage value, the described second given limit voltage value and the described second given incremental voltage value are analog-digital chip output.
In concrete practical application, the voltage of described power supply is 24V；Certainly, the voltage of described power supply can also be other values, is only a kind of example herein, is not necessarily limited to this, all in the protection domain of the application.
In actual application, described first sampled signal obtained and described second sampled signal are respectively less than the maximum allowed current value inputting acquisition system equal to described analog quantity electric current.
Optionally, the described first given limit voltage value meets: V1≤VCC-I×R1, wherein, V1For the described first given limit voltage value, VCCFor described supply voltage, I is the maximum allowed current value of described analog quantity electric current input acquisition system, R1It it is the resistance of the first resistance R1.
Table 1 show the state table of the described analog quantity electric current input various duty of acquisition system, described supply voltage VCCBeing example for 24V, input analog current is example by 4～20mA that working site is conventional, and embodiment more than maximum input current, need to be illustrated by maximum allowed current value for 25mA.
The state table of table 1 analog quantity electric current input acquisition system
As shown in table 1, under the duty of distribution electric current input pattern, the described first given limit voltage value meets: V1≤24-I×R1, the described first given incremental voltage value is zero.
Inputting under the duty of self diagnostic mode at distribution electric current, the described first given limit voltage value meets: V1≤24-I×R1, and the described first given incremental voltage value is the parameter being configured according to concrete diagnostic environment, is not specifically limited herein.Simultaneously, the value of the maximum allowed current value I of described analog quantity electric current input acquisition system also can change with the change of the described first given incremental voltage value, by different from the maximum allowed current value I value of the described analog quantity electric current input acquisition system under the duty of distribution electric current input pattern, depending on its concrete applied environment, it is not specifically limited herein.
Optionally, the described second given limit voltage value meets: V2≥I×R2, wherein, V2For the described second given limit voltage value, I is the maximum allowed current value of described analog quantity electric current input acquisition system, R2It it is the resistance of the second resistance R2.
As shown in table 1, under the duty of non-distribution electric current input pattern, the described second given limit voltage value meets: V2≥I×R2, the described second given incremental voltage value is 24V.
Inputting under the duty of self diagnostic mode at non-distribution electric current, the described second given limit voltage value meets: V2≥I×R2, and the described second given incremental voltage value is the parameter being configured according to concrete diagnostic environment, is not specifically limited herein.Simultaneously, the value of the maximum allowed current value I of described analog quantity electric current input acquisition system also can change with the change of the described second given incremental voltage value, by different from the maximum allowed current value I value of the described analog quantity electric current input acquisition system under the duty of non-distribution electric current input pattern, depending on its concrete applied environment, it is not specifically limited herein.
First current source 101 of the first operational amplifier U1 and PMOS transistor Q1 composition, by the first given limit voltage value V1Control, the first current source 101 set electric current as (24V-V1)/R1, when input current is less than when setting electric current, the first current source 101 pressure drop is only small, does not affect the driving of transmitter.
Second operational amplifier U2 and nmos pass transistor Q2 forms the second current source 102, by the second given limit voltage value V2Control, the setting electric current=V of the second current source 1022/ R2, when input current is less than when setting electric current, the second current source 102 pressure drop is only small, does not affect the driving of transmitter；
The first given limit voltage value V2 of given limit voltage value V1 and the second can pass through analog-digital chip DAC and control output, can pass through embedded software configuration and realize in described analog-digital chip.Certainly; in actual applications; first given limit voltage value V1, the described first given incremental voltage value, the second given incremental voltage value of given limit voltage value V2 and described second may be used without other modes and obtain; it is only a kind of example herein; it is not necessarily limited to this, all in the protection domain of the application.
During distribution electric current input drainage pattern, described first controls input interface receives the described first given limit voltage value V1Need to meet: 25mA=(24V-V1)/R1(the maximum allowed current value of the first current source 101 is greater than the input current of transmitter, otherwise the maximum input current of transmitter can be limited by maximum allowed current value, and the first current source 101 maximum allowed current value be set as that above-mentioned formula determines).First given limit voltage value V2It is set as 0.
During non-distribution electric current input drainage pattern, described first controls input interface receives the described first given limit voltage value V1Being set as 24V, described second controls input interface receives the described second given limit voltage value V225mA=V need to be met2/R2。
During distribution electric current input self diagnostic mode, input on the basis of drainage pattern at distribution electric current, described second controls input interface receives the described first given incremental voltage value, the increment of described first sampled signal that the described first given incremental voltage value causes need to deduct the difference of maximum input current less than maximum allowed current value, the increment of described first sampled signal collected according to described first Sampling Interface and change the described second signal increment controlled caused by input interface setting value (namely increasing by the described first given incremental voltage value) and contrast, carry out the self diagnosis of distribution electric current input Acquisition Circuit.Such as, if the described first given incremental voltage value is 0.1V, the resistance of the second resistance R2 is 100 ohm, then the increment of described first sampled signal should be 1mA in theory, if now the value of described first sampled signal is 1mA really, or the 90%～110% of 1mA, then it is assumed that described analog quantity electric current input acquisition system zero deflection working properly, otherwise it is assumed that abnormal.
During non-distribution electric current input self diagnostic mode, input on the basis of drainage pattern at non-distribution electric current, described first controls input interface receives the described second given incremental voltage value, the increment of described second sampled signal that the described second given incremental voltage value causes need to deduct the difference of maximum input current less than maximum allowed current value, the increment of described second sampled signal collected according to described second Sampling Interface and change the described first signal increment controlled caused by input interface setting value (namely increasing by the described second given incremental voltage value) and contrast, carry out the self diagnosis of non-distribution electric current input Acquisition Circuit.Such as, if the described second given incremental voltage value is 0.1V, the resistance of the first resistance R1 is 100 ohm, then the increment of described second sampled signal should be 1mA in theory, if now the value of described second sampled signal is 1mA really, or the 90%～110% of 1mA, then it is assumed that described analog quantity electric current input acquisition system zero deflection working properly, otherwise it is assumed that abnormal.
What deserves to be explained is, described supply voltage V in the present embodimentCCAll illustrate for 24V, but in concrete practical application, described supply voltage VCCBeing not necessarily limited to 24V, it is possible to select according to concrete practical situation, the described first given limit voltage value needs the formula met also generation to be changed accordingly, no longer repeats one by one, all in the protection domain of the application herein.
Analog quantity electric current input acquisition system described in the present embodiment, is possible not only to actively increase and decrease on the control end of the first current source 101 and the second current source 102 current signal, by the incremental raio of the sampled signal self diagnosis to realizing analog quantity electric current input deviation；Additionally also support that the input of distribution analog current gathers and the input of non-distribution analog current gathers simultaneously.By software arrangements, the described first given limit voltage value, the described first given incremental voltage value, the described second given limit voltage value and the described second given incremental voltage value are configured, it is also possible to control described analog quantity electric current input acquisition system and realize the switching of different operating state and the current-limiting protection function of described analog quantity electric current input acquisition system.And described analog quantity electric current input acquisition system adopts common components and parts to constitute, topology is simple, and diagnostic method is reliable.
Preferably, the first resistance R1 and the second resistance R2 is precision resistance.
Whether select precision resistance to depend on the acquisition precision requirement to system, if system acquisition required precision is the error of 0.1%, then the required precision of the first resistance R1 and the second resistance R2 necessarily be greater than 0.1%.
In the present invention, each embodiment adopts the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment, owing to it corresponds to the method disclosed in Example, so what describe is fairly simple, relevant part illustrates referring to method part.
Below it is only the preferred embodiment of the present invention, makes to skilled artisans appreciate that or realize the present invention.The multiple amendment of these embodiments be will be apparent to one skilled in the art, and generic principles defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (9)
1. an analog quantity electric current input acquisition system, it is characterised in that including: the first current source, the second current source, the first resistance and the second resistance；Wherein:
The end that controls of described first current source is the first control input interface that described analog quantity electric current inputs acquisition system；
The end that controls of described second current source is the second control input interface that described analog quantity electric current inputs acquisition system；
First end of described first current source is connected with one end of described first resistance, and junction point is the first acquisition interface of described analog quantity electric current input acquisition system；
The other end of described first resistance is connected with power supply；
Second end of described first current source is connected with the first end of described second current source, and junction point is the transmitter anode interface of described analog quantity electric current input acquisition system；
Second end of described second current source is connected with one end of described second resistance, and junction point is the second acquisition interface of described analog quantity electric current input acquisition system；
The other end of described second resistance is the transmitter negative pole interface of described analog quantity electric current input acquisition system, and ground connection；
When described transmitter anode interface is connected with non-distribution transmitter with described transmitter negative pole interface, described first current source is received the first given limit voltage value for controlling termination by it and turns on, and exports the first sampled signal by its first end；Described second current source is received the first given incremental voltage value for controlling termination by it and turns on；
When described transmitter anode interface is connected with distribution transmitter with described transmitter negative pole interface, described second current source is received the second given limit voltage value for controlling termination by it and turns on, and exports the second sampled signal by its second end；Described first current source is received the second given incremental voltage value for controlling termination by it and turns on.
2. analog quantity electric current according to claim 1 input acquisition system, it is characterised in that described first current source includes: the first operational amplifier and PMOS transistor；Wherein:
The in-phase input end of described first operational amplifier is the control end of described first current source；
The inverting input of described first operational amplifier is connected with the source electrode of described PMOS transistor, and junction point is the first end of described first current source；
The outfan of described first operational amplifier is connected with the grid of described PMOS transistor；
Second end that drain electrode is described first current source of described PMOS transistor.
3. analog quantity electric current according to claim 2 input acquisition system, it is characterised in that described second current source includes: the second operational amplifier and nmos pass transistor；Wherein:
The in-phase input end of described second operational amplifier is the control end of described second current source；
The inverting input of described second operational amplifier is connected with the source electrode of described nmos pass transistor, and junction point is the second end of described second current source；
The outfan of described second operational amplifier is connected with the grid of described nmos pass transistor；
First end that drain electrode is described second current source of described nmos pass transistor.
4. analog quantity electric current according to claim 1 input acquisition system, it is characterized in that, the described first given limit voltage value, the described first given incremental voltage value, the described second given limit voltage value and the described second given incremental voltage value are analog-digital chip output.
5. according to the arbitrary described analog quantity electric current input acquisition system of Claims 1-4, it is characterised in that the described first given limit voltage value meets: V1≤VCC-I×R1, wherein, V1For the described first given limit voltage value, VCCFor described supply voltage, I is the maximum allowed current value of described analog quantity electric current input acquisition system, R1Resistance for described first resistance.
6. analog quantity electric current according to claim 5 input acquisition system, it is characterised in that the described first given incremental voltage value is zero.
7. according to the arbitrary described analog quantity electric current input acquisition system of Claims 1-4, it is characterised in that the described second given limit voltage value meets: V2≥I×R2, wherein, V2For the described second given limit voltage value, I is the maximum allowed current value of described analog quantity electric current input acquisition system, R2Resistance for described second resistance.
8. analog quantity electric current according to claim 7 input acquisition system, it is characterised in that the described second given incremental voltage value is 24V.
9. according to the arbitrary described analog quantity electric current input acquisition system of Claims 1-4, it is characterised in that described first resistance and described second resistance are precision resistance.
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| CN111190047A (en) * | 2019-10-11 | 2020-05-22 | 浙江中控技术股份有限公司 | Current acquisition diagnosis circuit and failure diagnosis method thereof |
| CN111722148A (en) * | 2020-07-06 | 2020-09-29 | 浙江中控技术股份有限公司 | Fault diagnosis system of current sampling resistor circuit |
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| CN105717342B (en) | 2018-10-16 |
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Inventor after: Huang Wenjun Inventor after: Xu Wenqing Inventor after: Xie Quntiao Inventor after: Chen Yu Inventor before: Xu Wenqing Inventor before: Xie Quntiao Inventor before: Chen Yu |