CN204065209U - A kind of electric current isolation detection circuit - Google Patents
A kind of electric current isolation detection circuit Download PDFInfo
- Publication number
- CN204065209U CN204065209U CN201420303451.8U CN201420303451U CN204065209U CN 204065209 U CN204065209 U CN 204065209U CN 201420303451 U CN201420303451 U CN 201420303451U CN 204065209 U CN204065209 U CN 204065209U
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- circuit
- voltage
- frequency conversion
- electric current
- isolation detection
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Abstract
The utility model discloses a kind of electric current isolation detection circuit, it comprises sample circuit, amplifying circuit, photoelectric coupled circuit, first voltage-frequency conversion circuit and the second voltage-frequency conversion circuit, sample circuit comprises sample resistance, sample resistance is connected current circuit to be detected, amplifying circuit comprises operational amplifier, the input end of amplifying circuit connects sample circuit, the output terminal of amplifying circuit connects the first voltage-frequency conversion circuit, photoelectric coupled circuit comprises optocoupler, the input end of photoelectric coupled circuit connects the first voltage-frequency conversion circuit, the output terminal of photoelectric coupled circuit connects the second voltage-frequency conversion circuit, the positive power source terminal of the operational amplifier of amplifying circuit and negative power end are connected respectively positive voltage source circuit and negative voltage source circuit, its tool has the following advantages: the linearity is good, undistortedly reduced-current value can be detected and reflect, and can realize the reverse reduction conversion of frequency to voltage at the last output terminal of electric current isolation detection circuit, size of current presents by final voltage form.
Description
Technical field
The utility model relates to a kind of electric current isolation detection circuit.
Background technology
There are following 2 deficiencies in electric current isolation detection circuit of the prior art: 1, the current detection circuit linearity is inadequate, such as when electric current is less, discharge circuit is not wherein often because adopt dual power supply to cause small area analysis signal not realize Linear Amplifer, there will be cutoff distortion, current detection range is less; 2, existing testing circuit only adopts a voltage-frequency conversion chip, frequency signal can not restored as voltage signal directly presents after the output terminal of optical coupling isolation circuit.
Utility model content
The utility model provides a kind of electric current isolation detection circuit, which overcomes the deficiencies in the prior art described in background technology.
The technical scheme adopted that the utility model solves its technical matters is:
A kind of electric current isolation detection circuit, it comprises sample circuit, amplifying circuit, photoelectric coupled circuit, first voltage-frequency conversion circuit, described sample circuit comprises sample resistance, sample resistance is connected current circuit to be detected, amplifying circuit comprises operational amplifier, the input end of amplifying circuit connects sample circuit, the output terminal of amplifying circuit connects the first voltage-frequency conversion circuit, photoelectric coupled circuit comprises optocoupler, the input end of photoelectric coupled circuit connects the first voltage-frequency conversion circuit, the positive power source terminal of the operational amplifier of amplifying circuit and negative power end are connected respectively positive voltage source circuit and negative voltage source circuit.
Among one embodiment: also comprise the second voltage-frequency conversion circuit, the output terminal of photoelectric coupled circuit connects the second voltage-frequency conversion circuit, and first, second voltage-frequency conversion circuit comprises a voltage-frequency conversion chip respectively.
Among one embodiment: described positive voltage source circuit is a decompression voltage regulator, described negative voltage source circuit comprises a negative pressure and produces chip and the output terminal connecting positive voltage source.
Among one embodiment: described voltage-frequency conversion chip comprises LM331 chip
Among one embodiment: described negative pressure produces chip and comprises ICL7660 chip.
The technical program is compared with background technology, and its tool has the following advantages:
1, the positive power source terminal of the operational amplifier of amplifying circuit and negative power end are connected respectively positive voltage source circuit and negative voltage source circuit, just adopt, negative double voltage source is powered, expand the Linear Amplifer scope of operational amplifier, small area analysis is made to be gathered in this current detecting system undistortedly and present, in the application scenario being judgment threshold with the size of current signal, due to the undistorted acquisition of current signal, the setting of its current threshold is also by the distortion effect not by current signal, current threshold can be set to lower value, improve the accuracy of detection of application system.
2, this electric current isolation detection circuit also comprises the second voltage-frequency conversion circuit, the output terminal of photoelectric coupled circuit connects the second voltage-frequency conversion circuit, first, second voltage-frequency conversion circuit comprises a voltage-frequency conversion chip respectively, and current signal collection finally can be presented afterwards in the form of a voltage.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Fig. 1 depicts the circuit diagram of the electric current isolation detection circuit described in the present embodiment.
Embodiment
Please refer to Fig. 1, a kind of electric current isolation detection circuit, it comprises sample circuit 1, amplifying circuit 2, photoelectric coupled circuit 3, first voltage-frequency conversion circuit 4, described sample circuit comprises sample resistance 11, sample resistance 11 is connected current circuit to be detected, amplifying circuit 2 comprises operational amplifier 21, the input end of amplifying circuit 2 connects sample circuit 1, the output terminal of amplifying circuit 2 connects the first voltage-frequency conversion circuit 4, photoelectric coupled circuit 3 comprises optocoupler 31, the input end of photoelectric coupled circuit 3 connects the first voltage-frequency conversion circuit 4, the positive power source terminal of the operational amplifier 21 of amplifying circuit 2 and negative power end are connected respectively positive voltage source circuit 6 and negative voltage source circuit 7.
This electric current isolation detection circuit also comprises the second voltage-frequency conversion circuit 5, and the output terminal of photoelectric coupled circuit 3 connects the second voltage-frequency conversion circuit 5, and first, second voltage-frequency conversion circuit (4,5) comprises a voltage-frequency conversion chip (41,51) respectively.Described voltage-frequency conversion chip is existing circuit chip, described voltage-frequency conversion circuit is existing voltage-frequency conversion circuit, utilize this second voltage-frequency conversion circuit 5 that this current signal finally can directly be presented in the form of a voltage, in the present embodiment, described voltage-frequency conversion chip adopts LM331 model chip.
Described positive voltage source circuit 6 is a decompression voltage regulator, in one preferred embodiment, 78L05 model integrated regulator 61 is adopted to carry out step-down and voltage stabilizing to required positive voltage source in this decompression voltage regulator 6, described negative voltage source circuit 7 comprises a negative pressure and produces chip and the output terminal connecting positive voltage source, to produce negative voltage source.In the present embodiment, described negative pressure produces chip and adopts ICL7660 model chip 71.
This electric current isolation detection circuit improves current detection range and precision, have also been enlarged its range of application simultaneously, in the application scenario being judgment threshold with the size of current signal, due to the undistorted acquisition of current signal, the setting of its current threshold is also by the distortion effect not by current signal, current threshold can be set to lower value, improve the accuracy of detection of application system.In one preferred embodiment, this electric current isolation detection circuit is used for the chocking-up degree detecting water pump, the chocking-up degree of water pump is detected by the size of current detected in pump motor, the minimum current value that electric current isolation detection circuit can detect can react the slightest situation of the water pump blocking that can detect, improves detection sensitivity.
The above, be only the utility model preferred embodiment, therefore the scope that the utility model implements can not be limited according to this, the equivalence namely done according to the utility model the scope of the claims and description change with modify, all should still belong in scope that the utility model contains.
Claims (5)
1. an electric current isolation detection circuit, it is characterized in that: comprise sample circuit, amplifying circuit, photoelectric coupled circuit, first voltage-frequency conversion circuit, described sample circuit comprises sample resistance, sample resistance is connected current circuit to be detected, amplifying circuit comprises operational amplifier, the input end of amplifying circuit connects sample circuit, the output terminal of amplifying circuit connects the first voltage-frequency conversion circuit, photoelectric coupled circuit comprises optocoupler, the input end of photoelectric coupled circuit connects the first voltage-frequency conversion circuit, the positive power source terminal of the operational amplifier of amplifying circuit and negative power end are connected respectively positive voltage source circuit and negative voltage source circuit.
2. a kind of electric current isolation detection circuit according to claim 1, it is characterized in that: also comprise the second voltage-frequency conversion circuit, the output terminal of photoelectric coupled circuit connects the second voltage-frequency conversion circuit, and first, second voltage-frequency conversion circuit comprises a voltage-frequency conversion chip respectively.
3. a kind of electric current isolation detection circuit according to claim 1, is characterized in that: described positive voltage source circuit is a decompression voltage regulator, and described negative voltage source circuit comprises a negative pressure and produces chip and the output terminal connecting positive voltage source.
4. a kind of electric current isolation detection circuit according to claim 2, is characterized in that: described voltage-frequency conversion chip comprises LM331 chip.
5. a kind of electric current isolation detection circuit according to claim 3, is characterized in that: described negative pressure produces chip and comprises ICL7660 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420303451.8U CN204065209U (en) | 2014-06-09 | 2014-06-09 | A kind of electric current isolation detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420303451.8U CN204065209U (en) | 2014-06-09 | 2014-06-09 | A kind of electric current isolation detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204065209U true CN204065209U (en) | 2014-12-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420303451.8U Expired - Fee Related CN204065209U (en) | 2014-06-09 | 2014-06-09 | A kind of electric current isolation detection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN204065209U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109839534A (en) * | 2017-11-27 | 2019-06-04 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of power current isolation Acquisition Circuit |
-
2014
- 2014-06-09 CN CN201420303451.8U patent/CN204065209U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109839534A (en) * | 2017-11-27 | 2019-06-04 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of power current isolation Acquisition Circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141231 |