CN203133147U - Current amount absolute value measuring device of Hall current sensor - Google Patents
Current amount absolute value measuring device of Hall current sensor Download PDFInfo
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- CN203133147U CN203133147U CN 201320131193 CN201320131193U CN203133147U CN 203133147 U CN203133147 U CN 203133147U CN 201320131193 CN201320131193 CN 201320131193 CN 201320131193 U CN201320131193 U CN 201320131193U CN 203133147 U CN203133147 U CN 203133147U
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- current sensor
- absolute value
- operational amplifier
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Abstract
The utility model relates to a current amount absolute value measuring device of a Hall current sensor. The device comprises a Hall current sensor, a signal amplifier, an absolute value measurement circuit and a controller which are connected in series. The controller is connected with the Hall current sensor through an automatic control switch. Compared with the prior art, the current amount absolute value measuring device has the advantages of simplicity, easy implementation, safety and reliability.
Description
Technical field
The utility model relates to a kind of servicing unit of Hall current sensor, especially relates to a kind of magnitude of current absolute value determinator of Hall current sensor.
Background technology
The electric current variation range of transformer neutral point is very big, usually in 50A, but some unexpected situation, may reach more than the 100A, this has brought very big difficulty with regard to the measurement of giving neutral point current, and the electric current of neutral point is made up of DC current and alternating current, in the prior art the logical Hall current sensor that adopts of the measurement of neutral point current is measured, yet the Hall current sensor that range ability is big all is the 1%F.S. precision usually, and when measuring less electric current, the error of bringing is too big.Therefore, in order to guarantee the precision of large-range measuring, need usually to adopt the Hall current sensor of a plurality of different ranges to measure together, sample its output result after, by controller relatively, select the high measurement result of precision.Yet, in this case, a plurality of Hall current sensors must be in running order always, if the time that big electric current occurs is longer, the Hall current sensor that range is little is easy to damage, and sampling back result of determination, sample circuit is comparatively complicated, and sampled result judges that to controller inside range is also comparatively complicated, consume a large amount of controller resources, need the long processing time.
And the device complexity of the magnitude of current absolute value of existing measurement Hall current sensor, cost height, repair rate height.
Summary of the invention
The purpose of this utility model be exactly provide in order to overcome the defective that above-mentioned prior art exists a kind of install simple, be easy to realize, the magnitude of current absolute value determinator of safe and reliable Hall current sensor.
The purpose of this utility model can be achieved through the following technical solutions: a kind of magnitude of current absolute value determinator of Hall current sensor, it is characterized in that, comprise Hall current sensor, signal amplifier, absolute value metering circuit and the controller of series connection successively, described controller connects Hall current sensor by automatic control switch.
Described signal amplifier comprises operational amplifier a, resistance R 1, resistance R 2, resistance R 3 and bias voltage, the output terminal of described Hall current sensor is by the negative of resistance R 1 concatenation operation amplifier a, described bias voltage is by the positive of resistance R 2 concatenation operation amplifier a, and described resistance R 3 is connected in parallel on negative and the output terminal of operational amplifier a.
Described absolute value metering circuit comprises two operational amplifiers, two diodes, and with some resistance of each arithmetical unit, diode serial or parallel connection, two operational amplifiers comprise operational amplifier b, operational amplifier c, and operational amplifier c connects after described operational amplifier b and two the diode parallel connections.
Described two diodes are diode a, diode b, described resistance is provided with 6: resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, the output terminal of described signal amplifier is by the negative of resistance R 4 concatenation operation amplifier b, the positive ground connection of operational amplifier b, described resistance R 5 are connected in parallel between the positive and output terminal of operational amplifier b; The output terminal of described signal amplifier is by the positive of resistance R 9 concatenation operation amplifier c, described diode a and diode b oppositely are connected in parallel on respectively between the positive and output terminal of operational amplifier c, the negative pole end resistance in series R7 of diode a wherein, the negative pole end resistance in series R8 of diode b, described resistance R 6 is connected between the negative pole of the negative of operational amplifier b and diode a.
Compared with prior art, the utility model device simple, be easy to realize, safe and reliable.
Description of drawings
Fig. 1 is device synoptic diagram of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
Embodiment
As shown in Figure 1, a kind of magnitude of current absolute value determinator of Hall current sensor, it is characterized in that, the Hall current sensor 1, signal amplifier 2, absolute value metering circuit 3 and the controller 4 that comprise series connection successively, described controller 4 connects Hall current sensor 1 by automatic control switch 5.
Described signal amplifier 2 comprises operational amplifier a21, resistance R 1, resistance R 2, resistance R 3 and bias voltage 22, the output terminal of described Hall current sensor 1 is by the negative of resistance R 1 concatenation operation amplifier a21, described bias voltage 22 is by the positive of resistance R 2 concatenation operation amplifier a21, and described resistance R 3 is connected in parallel on negative and the output terminal of operational amplifier a21.
Described absolute value metering circuit 3 comprises two operational amplifiers, two diodes, and with some resistance of each arithmetical unit, diode serial or parallel connection, two operational amplifiers comprise operational amplifier b31, operational amplifier c32, and operational amplifier c32 connects after described operational amplifier b31 and two the diode parallel connections.
Described two diodes are diode a33, diode b34, described resistance is provided with 6: resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, the output terminal of described signal amplifier is by the negative of resistance R 4 concatenation operation amplifier b31, the positive ground connection of operational amplifier b1, described resistance R 5 are connected in parallel between the positive and output terminal of operational amplifier b31; The output terminal of described signal amplifier is by the positive of resistance R 9 concatenation operation amplifier c32, described diode a33 and diode b34 oppositely are connected in parallel on respectively between the positive and output terminal of operational amplifier c32, the negative pole end resistance in series R7 of diode a33 wherein, the negative pole end resistance in series R8 of diode b34, described resistance R 6 is connected between the negative pole of the negative of operational amplifier b31 and diode a33.
Claims (4)
1. the magnitude of current absolute value determinator of a Hall current sensor, it is characterized in that, comprise Hall current sensor, signal amplifier, absolute value metering circuit and the controller of series connection successively, described controller connects Hall current sensor by automatic control switch.
2. the magnitude of current absolute value determinator of a kind of Hall current sensor according to claim 1, it is characterized in that, described signal amplifier comprises operational amplifier a, resistance R 1, resistance R 2, resistance R 3 and bias voltage, the output terminal of described Hall current sensor is by the negative of resistance R 1 concatenation operation amplifier a, described bias voltage is by the positive of resistance R 2 concatenation operation amplifier a, and described resistance R 3 is connected in parallel on negative and the output terminal of operational amplifier a.
3. the magnitude of current absolute value determinator of a kind of Hall current sensor according to claim 1, it is characterized in that, described absolute value metering circuit comprises two operational amplifiers, two diodes, and with some resistance of each arithmetical unit, diode serial or parallel connection, two operational amplifiers comprise operational amplifier b, operational amplifier c, and operational amplifier c connects after described operational amplifier b and two the diode parallel connections.
4. the magnitude of current absolute value determinator of a kind of Hall current sensor according to claim 3, it is characterized in that, described two diodes are diode a, diode b, described resistance is provided with 6: resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, the output terminal of described signal amplifier is by the negative of resistance R 4 concatenation operation amplifier b, the positive ground connection of operational amplifier b, described resistance R 5 are connected in parallel between the positive and output terminal of operational amplifier b; The output terminal of described signal amplifier is by the positive of resistance R 9 concatenation operation amplifier c, described diode a and diode b oppositely are connected in parallel on respectively between the positive and output terminal of operational amplifier c, the negative pole end resistance in series R7 of diode a wherein, the negative pole end resistance in series R8 of diode b, described resistance R 6 is connected between the negative pole of the negative of operational amplifier b and diode a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320131193 CN203133147U (en) | 2013-03-21 | 2013-03-21 | Current amount absolute value measuring device of Hall current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320131193 CN203133147U (en) | 2013-03-21 | 2013-03-21 | Current amount absolute value measuring device of Hall current sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203133147U true CN203133147U (en) | 2013-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320131193 Expired - Lifetime CN203133147U (en) | 2013-03-21 | 2013-03-21 | Current amount absolute value measuring device of Hall current sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN203133147U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106840214A (en) * | 2017-04-05 | 2017-06-13 | 贵州电网有限责任公司电力科学研究院 | A kind of absolute value signal conversion equipment and method |
-
2013
- 2013-03-21 CN CN 201320131193 patent/CN203133147U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106840214A (en) * | 2017-04-05 | 2017-06-13 | 贵州电网有限责任公司电力科学研究院 | A kind of absolute value signal conversion equipment and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130814 |