CN104502685B - A kind of electric current output self diagnosis circuit - Google Patents
A kind of electric current output self diagnosis circuit Download PDFInfo
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- CN104502685B CN104502685B CN201410729485.8A CN201410729485A CN104502685B CN 104502685 B CN104502685 B CN 104502685B CN 201410729485 A CN201410729485 A CN 201410729485A CN 104502685 B CN104502685 B CN 104502685B
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- electric current
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- differential voltage
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- analog
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Abstract
A kind of electric current output self diagnosis circuit is related to electric current output self-diagnostic circuit technical field, and the solution is to improve output signal reliability.The circuit includes electric current output transmitting module, and the power input of the electric current output transmitting module terminates an external power supply, and the electric current output control terminal of electric current output transmitting module connects an external control signal, it is characterised in that：Further include that a differential voltage turns current module, an analog-to-digital conversion module；The external power supply is connected to the power input that electric current exports transmitting module by a differential voltage sampling resistor, two differential voltage input terminals that differential voltage turns current module are coupled with the both ends of differential voltage sampling resistor, the output that differential voltage turns current module terminates to the input end of analog signal of analog-to-digital conversion module, and the feedback voltage output end of analog-to-digital conversion module is connected to the output end that differential voltage turns current module through a feedback sample resistance.Circuit provided by the invention, output signal reliability are high.
Description
Technical field
The present invention relates to industrial control technologies, and the technology of self diagnosis circuit is exported more particularly to a kind of electric current.
Background technology
Current output channels are prevalent in as a conventional way of output in each DCS system and PLC system,
Conventional structure is to export transmitting module using an electric current to realize that electric current output control, the power supply that electric current exports transmitting module are defeated
Enter and terminate to external power supply, the electric current output control terminal of electric current output transmitting module connects external control signal.But in unskilled labor
Industry control field, it is often not high for the reliability requirement of output circuit, it is general only to realize electric current output control, it can not catch in time
The failure of current output circuit is obtained, therefore the reliability of its output signal is relatively low.
Invention content
Defect present in for the above-mentioned prior art, technical problem to be solved by the invention is to provide a kind of output letters
The high electric current of number reliability exports self diagnosis circuit.
In order to solve the above-mentioned technical problem, a kind of electric current provided by the present invention exports self diagnosis circuit, including electric current
Transmitting module is exported, the power input of the electric current output transmitting module terminates an external power supply, and electric current exports transmitting module
Electric current output control terminal connects an external control signal, it is characterised in that：Further include that a differential voltage turns current module, a modulus turns
Change the mold block；
The external power supply is connected to the power input that electric current exports transmitting module by a differential voltage sampling resistor, poor
Two differential voltage input terminals that component voltage turns current module are coupled with the both ends of differential voltage sampling resistor, and differential voltage turns
The output of current module terminates to the input end of analog signal of analog-to-digital conversion module, the feedback voltage output end of analog-to-digital conversion module
It is connected to the output end that differential voltage turns current module through a feedback sample resistance；
Transformed electric current is converted into voltage by the feedback sample resistance；And it is input to analog-to-digital conversion module, into
Row output feedback monitoring.
Electric current provided by the invention exports self diagnosis circuit, turns current module, analog-to-digital conversion module using differential voltage,
And differential voltage sampling resistor, feedback sample resistance come acquire and monitoring current export transmitting module operating mode, can capture in time
Electric current exports failure, to improve the reliability of current output signal.
Description of the drawings
Fig. 1 is the circuit diagram of the electric current output self diagnosis circuit of the embodiment of the present invention.
Specific implementation mode
The embodiment of the present invention is described in further detail below in conjunction with description of the drawings, but the present embodiment is not used to limit
The system present invention, every similar structure using the present invention and its similar variation, should all be included in protection scope of the present invention.
As shown in Figure 1, a kind of electric current output self diagnosis circuit that the embodiment of the present invention is provided, including electric current output become
Module U1, the power input of the electric current output transmitting module U1 is sent to terminate an external power supply C4, electric current exports transmitting module U1
Electric current output control terminal meet an external control signal F2, it is characterised in that：Further include that a differential voltage turns current module U2, one
Analog-to-digital conversion module U3；
The power supply that the external power supply C4 is connected to electric current output transmitting module U1 by a differential voltage sampling resistor R1 is defeated
Enter end, two differential voltage input terminals that differential voltage turns current module U2 are coupled with the two of differential voltage sampling resistor R1
End, the output that differential voltage turns current module U2 terminate to the input end of analog signal of analog-to-digital conversion module U3, analog-to-digital conversion mould
The feedback voltage output end of block U3 is connected to the output end that differential voltage turns current module U2 through a feedback sample resistance R2.
In the embodiment of the present invention, the electric current output transmitting module U1 is exported using the electric current of model XTR115 to be become
Chip, differential voltage is sent to turn conversion chips of the current module U2 using model INA169, analog-to-digital conversion module U3 is used
Be model ADS1248 modulus conversion chip.
The operation principle of the embodiment of the present invention is as follows：
The IO end feets that electric current exports transmitting module U1 are electric current output pin, are believed electric current by differential voltage sampling resistor R1
It number is converted into differential voltage signal and is input to differential voltage turning current module U2, current module is then turned defeated by differential voltage
The differential voltage entered is converted into electric current and is output to analog-to-digital conversion module U3, then by feedback sample resistance R2 transformed electric current
It is converted into voltage, and is input to analog-to-digital conversion module U3 and carries out output feedback monitoring, exports setting value and value of feedback by comparing,
Whether the IO end feets output current to confirm electric current output transmitting module U1 is normal, when the difference of output setting value and value of feedback is super
After crossing certain tolerance, electric current is fed back to by the digital signal output end DVDD of analog-to-digital conversion module U3 and exports transmitting module U1's
Electric current output control terminal IIN（2 feet）；
Secondly, in order to further confirm that failure, the input voltage that transmitting module U1 is exported by electric current monitors foot VREG prisons
Whether the voltage source for surveying external current loop is working properly, and by current loop end infusion circuit voltage test signal,
To further carry out fault location, confirm that the source of trouble is source external input or since current output module itself monitors work(
It can cause to fail.
Claims (1)
1. a kind of electric current exports self diagnosis circuit, including electric current exports transmitting module, the electricity of the electric current output transmitting module
The electric current output control terminal of source input one external power supply of termination, electric current output transmitting module connects an external control signal, feature
It is：Further include that a differential voltage turns current module, an analog-to-digital conversion module；
The external power supply is connected to the power input that electric current exports transmitting module, differential electrical by a differential voltage sampling resistor
Two differential voltage input terminals for turning current module are pressed to be coupled with the both ends of differential voltage sampling resistor, differential voltage turns electric current
The output of module terminates to the input end of analog signal of analog-to-digital conversion module, and the feedback voltage output end of analog-to-digital conversion module is through one
Feedback sample resistance is connected to the output end that differential voltage turns current module；
Transformed electric current is converted into voltage by the feedback sample resistance；And it is input to analog-to-digital conversion module, it carries out defeated
Go out feedback monitoring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410729485.8A CN104502685B (en) | 2014-12-05 | 2014-12-05 | A kind of electric current output self diagnosis circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410729485.8A CN104502685B (en) | 2014-12-05 | 2014-12-05 | A kind of electric current output self diagnosis circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104502685A CN104502685A (en) | 2015-04-08 |
| CN104502685B true CN104502685B (en) | 2018-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410729485.8A Active CN104502685B (en) | 2014-12-05 | 2014-12-05 | A kind of electric current output self diagnosis circuit |
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| CN (1) | CN104502685B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018114302B3 (en) * | 2018-06-14 | 2019-11-21 | Endress+Hauser SE+Co. KG | Diagnosis of a two-wire field device |
| CN111190047B (en) * | 2019-10-11 | 2022-03-25 | 浙江中控技术股份有限公司 | Current acquisition diagnosis circuit and failure diagnosis method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7042242B2 (en) * | 2004-05-25 | 2006-05-09 | Lsi Logic Corporation | Built-in self test technique for programmable impedance drivers for RapidChip and ASIC drivers |
| CN101526563A (en) * | 2009-04-07 | 2009-09-09 | 北京华视通广科技有限公司 | Motoring device for current input voltage output |
| CN104155510A (en) * | 2014-09-02 | 2014-11-19 | 湖北航天技术研究院总体设计所 | Closed loop integral type accelerometer dynamic current measuring device and method |
| CN204241559U (en) * | 2014-12-05 | 2015-04-01 | 国核自仪系统工程有限公司 | A kind of electric current exports self-diagnostic circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0690234B2 (en) * | 1989-07-27 | 1994-11-14 | 日電アネルバ株式会社 | Micro current measurement circuit |
-
2014
- 2014-12-05 CN CN201410729485.8A patent/CN104502685B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7042242B2 (en) * | 2004-05-25 | 2006-05-09 | Lsi Logic Corporation | Built-in self test technique for programmable impedance drivers for RapidChip and ASIC drivers |
| CN101526563A (en) * | 2009-04-07 | 2009-09-09 | 北京华视通广科技有限公司 | Motoring device for current input voltage output |
| CN104155510A (en) * | 2014-09-02 | 2014-11-19 | 湖北航天技术研究院总体设计所 | Closed loop integral type accelerometer dynamic current measuring device and method |
| CN204241559U (en) * | 2014-12-05 | 2015-04-01 | 国核自仪系统工程有限公司 | A kind of electric current exports self-diagnostic circuit |
Also Published As
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| CN104502685A (en) | 2015-04-08 |
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Address after: No. 428, Jiangchuan East Road, Minhang District, Shanghai Patentee after: STATE NUCLEAR POWER AUTOMATION SYSTEM ENGINEERING Co.,Ltd. Address before: 200241. A2036, building B, building 555, Dongchuan Road, Minhang District, Shanghai Patentee before: STATE NUCLEAR POWER AUTOMATION SYSTEM ENGINEERING Co.,Ltd. |
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