CN207896948U - A kind of electronic switching circuit for eliminating microcontroller current detection circuit amplifier temperature drift - Google Patents
A kind of electronic switching circuit for eliminating microcontroller current detection circuit amplifier temperature drift Download PDFInfo
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- CN207896948U CN207896948U CN201820235795.8U CN201820235795U CN207896948U CN 207896948 U CN207896948 U CN 207896948U CN 201820235795 U CN201820235795 U CN 201820235795U CN 207896948 U CN207896948 U CN 207896948U
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- resistance
- operational amplifier
- electronic switch
- amplifier
- chip microcomputer
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Abstract
The utility model discloses a kind of electronic switching circuits for eliminating microcontroller current detection circuit amplifier temperature drift,Including equipment power supply,Load,Simulant electronic switch,Operational amplifier and Chip Microcomputer A/D sampling module,Power supply powering load,Load is in parallel, and there are one resistance R2 and alloy sample resistance R7,Resistance R2 is connected to 1 ports IN of simulant electronic switch,Alloy sample resistance R7 is connected to 2 ports IN of simulant electronic switch by resistance R1,Alloy sample resistance R7 is also connected to the negative pole end of operational amplifier by electronics R4,The COM port of simulant electronic switch is connected to the positive terminal of operational amplifier by resistance R3,Resistance R3 is also connected to+5V power supplys by resistance R5,+ 5V power supplys are connected to operational amplifier,Operational amplifier is connected to Chip Microcomputer A/D sampling module,Resistance R4 is connected to Chip Microcomputer A/D sampling module by resistance R6,The New Energy effectively eliminates the temperature drift problem of operational amplifier in microcontroller current detection circuit,To greatly improve the accuracy of current detecting.
Description
Technical field
The utility model is related to electronic switching technology field, specially a kind of elimination microcontroller current detection circuit amplifier temperature
The electronic switching circuit of drift.
Background technology
It in the product for civilian use, is sampled using shunt resistance, operational amplifier amplified signal, then carries out AD via microcontroller and adopt
This mode of sample is very universal come the circuit for measuring electric current, but due to the temperature drift problems of operational amplifier, this mode
Acquisition current precision is not high, and when temperature changes, measured value can obviously change, and industry does not find to be fully solved
The scheme of this problem, I tries various circuits by repaying repeatedly, eventually by the mode for using electronic switch in circuit
Solve the temperature drift problems of amplifier, this circuit uses in the product for multiple current samplings that I develops, effect
Very well.
Utility model content
To achieve the above object, the utility model provides the following technical solutions：A kind of elimination microcontroller current detection circuit
The electronic switching circuit of amplifier temperature drift, including equipment power supply, load, simulant electronic switch, operational amplifier and Chip Microcomputer A/D are adopted
Egf block, the power supply powering load, the load is in parallel, and there are one resistance R2 and alloy sample resistance R7, the resistance R2
The ports IN-1 of simulant electronic switch are connected to, the alloy sample resistance R7 is connected to simulant electronic switch by resistance R1
The ports IN-2, the alloy sample resistance R7 are also connected to the negative pole end of operational amplifier, the simulation electronic by electronics R4
The COM port of switch is connected to the positive terminal of operational amplifier by resistance R3, and the resistance R3 is also connected to by resistance R5+
5V the power supplys ,+5V power supplys are connected to operational amplifier, and the operational amplifier is connected to Chip Microcomputer A/D sampling module, described
Resistance R4 is connected to Chip Microcomputer A/D sampling module by resistance R6.
Compared with prior art, the utility model has the beneficial effects that：The New Energy effectively eliminates microcontroller current detecting
The temperature drift problem of operational amplifier in circuit, to greatly improve the accuracy of current detecting.
Description of the drawings
Fig. 1 is the utility model circuit diagram；
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Embodiment：
Referring to Fig. 1, the utility model provides a kind of technical solution：A kind of elimination microcontroller current detection circuit amplifier temperature
The electronic switching circuit of drift, including equipment power supply, load, simulant electronic switch, operational amplifier and Chip Microcomputer A/D sampling module,
The power supply powering load, the load is in parallel to be connected to there are one resistance R2 with alloy sample resistance R7, the resistance R2
The ports IN-1 of simulant electronic switch, the alloy sample resistance R7 are connected to the ends IN-2 of simulant electronic switch by resistance R1
Mouthful, the alloy sample resistance R7 is also connected to the negative pole end of operational amplifier by electronics R4, the simulant electronic switch
COM port is connected to the positive terminal of operational amplifier by resistance R3, and the resistance R3 is also connected to+5V electricity by resistance R5
The source ,+5V power supplys are connected to operational amplifier, and the operational amplifier is connected to Chip Microcomputer A/D sampling module, the resistance
R4 is connected to Chip Microcomputer A/D sampling module by resistance R6.
Specifically used mode and advantage：Amplifier at work, with internal or outside temperature change, zero can occur
Offset, this circuit are added an electronic switch in the front end of amplifier, periodically select different signal source cycle samplings, to
The offset cancellation that amplifier is generated realizes zero shift, high-precision current measurement, specific works is realized using lower cost
Principle：Equipment power supply generates sampling voltage through overload, using R7, and R7 is alloy sample resistance, can generate stable voltage,
Sampling voltage wherein inputs IN-1 all the way through what R2 entered simulant electronic switch, and electronic switch is then controlled by single-chip microcomputer signal, when
When electronic switch gates IN-1, sampled signal enters the operational amplifier of rear class by electronic switch, after amplifier amplifies again
Corresponding circuit is calculated by Chip Microcomputer A/D conversion, when electronic switch gates IN-2, electronic switch is passed through in the preposition input of amplifier, then
It is shorted to ground through R1, amplifier input signal disappears at this time, and voltage when amplifier output end is static, electronic switch is by microcontroller control
System switches at high speed, the channel that switch sampling is inputted and inputted over the ground repeatedly, and microcontroller then calculates the difference between two-way input, makees
For true signal voltage, when amplifier temperature is raised and lowered, although zero is drifted about, because of the deviation of its generation
It acts between two-way input, after two-way voltage subtracts each other, is completely counterbalanced by simultaneously, to eliminate the temperature drift band of amplifier well
The measurement error come.
It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and
And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this practicality is new in other specific forms
Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this practicality is new
The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing in the equivalent requirements of the claims will be fallen
All changes in justice and range are embraced therein.Any reference numeral in claim should not be considered as limitation
Involved claim.
Claims (1)
1. a kind of electronic switching circuit for eliminating microcontroller current detection circuit amplifier temperature drift, which is characterized in that including equipment electricity
Source, load, simulant electronic switch, operational amplifier and Chip Microcomputer A/D sampling module, the power supply powering load, the load
In parallel there are one resistance R2 and alloy sample resistance R7, and the resistance R2 is connected to the ports IN-1 of simulant electronic switch, described
Alloy sample resistance R7 is connected to the ports IN-2 of simulant electronic switch by resistance R1, and the alloy sample resistance R7 also passes through
Electronics R4 is connected to the negative pole end of operational amplifier, and the COM port of the simulant electronic switch is connected to operation by resistance R3
The positive terminal of amplifier, the resistance R3 are also connected to+5V power supplys by resistance R5, and+5V the power supplys are connected to operation amplifier
Device, the operational amplifier are connected to Chip Microcomputer A/D sampling module, and the resistance R4 is connected to Chip Microcomputer A/D by resistance R6 and adopts
Egf block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820235795.8U CN207896948U (en) | 2018-02-09 | 2018-02-09 | A kind of electronic switching circuit for eliminating microcontroller current detection circuit amplifier temperature drift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820235795.8U CN207896948U (en) | 2018-02-09 | 2018-02-09 | A kind of electronic switching circuit for eliminating microcontroller current detection circuit amplifier temperature drift |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207896948U true CN207896948U (en) | 2018-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820235795.8U Active CN207896948U (en) | 2018-02-09 | 2018-02-09 | A kind of electronic switching circuit for eliminating microcontroller current detection circuit amplifier temperature drift |
Country Status (1)
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| CN (1) | CN207896948U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112834804A (en) * | 2020-12-30 | 2021-05-25 | 成都杰启科电科技有限公司 | Low-cost high-precision current acquisition sensor and control method thereof |
| CN115327215A (en) * | 2022-08-22 | 2022-11-11 | 北京思凌科半导体技术有限公司 | Current detection device and current detection system |
| CN117289018A (en) * | 2023-11-27 | 2023-12-26 | 成都赛迪育宏检测技术有限公司 | Fast and accurate FA-level current testing circuit |
-
2018
- 2018-02-09 CN CN201820235795.8U patent/CN207896948U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112834804A (en) * | 2020-12-30 | 2021-05-25 | 成都杰启科电科技有限公司 | Low-cost high-precision current acquisition sensor and control method thereof |
| CN115327215A (en) * | 2022-08-22 | 2022-11-11 | 北京思凌科半导体技术有限公司 | Current detection device and current detection system |
| CN115327215B (en) * | 2022-08-22 | 2023-08-08 | 北京思凌科半导体技术有限公司 | Current detection device and current detection system |
| CN117289018A (en) * | 2023-11-27 | 2023-12-26 | 成都赛迪育宏检测技术有限公司 | Fast and accurate FA-level current testing circuit |
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| TR01 | Transfer of patent right |
Effective date of registration: 20191023 Address after: No.26, group 2, Guandou village, Caijin Town, Wutongqiao District, Leshan City, Sichuan Province Patentee after: Liu Defang Address before: 710600 Xi'an University of Science And Technology, 48 Lintong, Shaanxi Province, Tongchuan, Shaanxi Patentee before: Xi'an University of Science and Technology |