CN203414580U - Precision dual temperature correction circuit of electronic load - Google Patents
Precision dual temperature correction circuit of electronic load Download PDFInfo
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- CN203414580U CN203414580U CN201320364951.8U CN201320364951U CN203414580U CN 203414580 U CN203414580 U CN 203414580U CN 201320364951 U CN201320364951 U CN 201320364951U CN 203414580 U CN203414580 U CN 203414580U
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Abstract
The utility model diskloses a precision dual temperature correction circuit of an electronic load. The precision dual temperature correction circuit comprises an ambient temperature measuring module, an operation processing unit, a measuring circuit, a change-over switch and a loading circuit. When the precision dual temperature correction circuit is working, a reference correction value in a current ambient temperature condition is acquired. A loading value acquired by measurement in the current ambient temperature condition is corrected through the reference correction value so as to eliminate influence of factors such as the temperature drift of circuit components. The real loading value in the current ambient temperature condition is thus acquired. The real loading value in the current ambient temperature condition is then compared with a set value stored in the operation processing unit in advance to acquire an accurate correction value. The accurate correction value is further output to the loading circuit so as to change the loading value in the loading circuit. The loading value in the loading circuit is thus accurately corrected.
Description
Technical field
The utility model relates to electronic load technology, relates in particular to a kind of accurate dual-temperature correction circuit of electronic load.
Background technology
When electronic load is worked under long-term work and different temperatures background, because the temperature coefficient problem of components and parts, all can have to draw and carry and the phenomenon of the temperature drift of measured value.Even if all components and parts have used the components and parts of extremely low temperature coefficient, also can cause because of the temperature coefficient cumulative errors of components and parts to draw and carry and the temperature drift of measured value.Cannot meet the precision measurement requirement that day by day requires accurate and strict military project power supply and medical power supply etc.For the test of this class precision voltage source, requirement must be carried and the phenomenon of the temperature drift of measured value is revised drawing of the electronic load of test, so that whole electronic load can have extremely low temperature coefficient under different working time sections and different temperatures background.
The temperature correction of existing electronic load, mainly by measuring actual environment temperature, and measure drawing under current environment temperature and carry a value (comprise pulling load current and draw live pressure), then drawing year value and setting value under the current environment temperature measuring are compared to computing, by the comparison operation result obtaining, go to change and draw drawing in live road to carry value, to reach to revise, draw the object of carrying value (revise pulling load current and draw live to press).The temperature correction of this electronic load, drawing under its current environment temperature measuring carried value, owing to being subject to the factor impacts such as temperature drift of circuit elements device, be not that a value is carried in actual drawing under current environment temperature, but there is certain error, and then cause drawing the correction of carrying value to produce error, precision is not high.This,, for the precision measurement of military project power supply and medical power supply etc., is unallowed.
Utility model content
The purpose of this utility model is to provide for the deficiencies in the prior art a kind of can accurately revise the accurate dual-temperature correction circuit that draws the electronic load that carries value.
The purpose of this utility model realizes by following technical measures: a kind of accurate dual-temperature correction circuit of electronic load, and it comprises ambient temperature measurement module, operation processing unit, metering circuit, change-over switch, draws live road;
Described ambient temperature measurement module is connected with the temperature signal input end of described operation processing unit, makes described operation processing unit measure current actual environment temperature value by described ambient temperature measurement module;
Described change-over switch is provided with current measurement input end, voltage measurement input end, for measuring the reference voltage input terminal of the reference voltage level under current environment temperature, public output, described public output is changeable is connected to described current measurement input end, voltage measurement input end or reference voltage input terminal, described current measurement input end with described in draw the current feedback terminal on live road to be connected, described voltage measurement input end with described in draw the pressure feedback port on live road to be connected, described public output is connected with the measuring-signal input end of described operation processing unit by described metering circuit,
The output terminal of described operation processing unit with described in draw the control end on live road to be connected, described in draw the test lead on live road to be connected with tested power supply.
Preferably, described ambient temperature measurement module comprises environment temperature sensor, temperature measuring circuit, described environment temperature sensor is connected with the input end of described temperature measuring circuit, and the output terminal of described temperature measuring circuit is connected with the temperature signal input end of described operation processing unit.
Preferably, the output terminal of described operation processing unit and described in draw between the control end on live road and be connected with D/A change-over circuit, the input end of described D/A change-over circuit is connected with the output terminal of described operation processing unit, the output terminal of described D/A change-over circuit with described in draw the control end on live road to be connected.
The utility model beneficial effect is:
The accurate dual-temperature correction circuit of the electronic load that the utility model provides, by obtaining the reference modified value under current environment temperature, by reference to modified value, drawing under the current environment temperature measuring being carried to value again revises, to eliminate the factor impacts such as temperature drift of circuit elements device, thereby actual the drawing obtaining under current environment temperature carried value, by the actual setting value of carrying value and being pre-stored within operation processing unit of drawing under current environment temperature, compare computing again, obtain accurate modified value, this accurate modified value is exported to and draws live road, to change, draw drawing in live road to carry value, making to draw drawing in live road to carry value is revised accurately.
Accompanying drawing explanation
Fig. 1 is the frame principle figure of the accurate dual-temperature correction circuit of electronic load of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
Please refer to Fig. 1, the accurate dual-temperature correction circuit of electronic load of the present utility model comprises ambient temperature measurement module, operation processing unit 3, metering circuit 4, change-over switch 5, draws live road 7.
Ambient temperature measurement module is connected with the temperature signal input end of operation processing unit 3, makes operation processing unit 3 measure current actual environment temperature value by ambient temperature measurement module; Specifically, ambient temperature measurement module comprises environment temperature sensor 1, temperature measuring circuit 42, environment temperature sensor 1 is connected with the input end of temperature measuring circuit 42, the output terminal of temperature measuring circuit 42 is connected with the temperature signal input end of operation processing unit 3, temperature measuring circuit 42 is measured after current actual environment temperature value by environment temperature sensor 1, then be transferred to operation processing unit 3.
Change-over switch 5 is provided with current measurement input end (IN_I), voltage measurement input end (IN_U), for measuring reference voltage input terminal (Vref_IN), the public output (OUT) of the reference voltage level under current environment temperature; Changeable current measurement input end, voltage measurement input end or the reference voltage input terminal of being connected to of public output, public output can switch and be connected to current measurement input end, voltage measurement input end or reference voltage input terminal according to the needs of circuit.Wherein, current measurement input end is connected with drawing the current feedback terminal (F_I) on live road 7, voltage measurement input end is connected with drawing the pressure feedback port (F_U) on live road 7, public output is connected with the measuring-signal input end of operation processing unit 3 by metering circuit 4, therefore, metering circuit 4 can measure to draw the pulling load current value on live road 7 or draw by change-over switch 5 and carry magnitude of voltage.
The output terminal of operation processing unit 3 is connected with drawing the control end on live road 7, the accurate modified value that operation processing unit 3 can be obtained computing, be transferred to the control end that draws live road 7, to change to draw the pulling load current value in live road 7 or draw, carry magnitude of voltage, make to draw the pulling load current value in live road 7 or draw live pressure value to be revised accurately.Wherein, draw the test lead (as the L+ in the present embodiment and L-) on live road 7 to be connected with tested power supply (as: military project power supply and medical power supply etc.) 8.
Wherein, the output terminal of operation processing unit 3 and draw between the control end on live road 7 be connected with D/A(D/A) change-over circuit 6, the input end of D/A change-over circuit 6 is connected with the output terminal of operation processing unit 3, the output terminal of D/A change-over circuit 6 is connected with drawing the control end on live road 7, D/A change-over circuit 6 can be converted to the digital signal of the output terminal output of operation processing unit 3 be applicable to draw the simulating signal of the control end on live road 7.
The principle of work of the accurate dual-temperature correction circuit of electronic load of the present utility model, as follows: first, by environment temperature sensor 1, temperature measuring circuit 42, measure current actual environment temperature value, then actual environment temperature value and the temperature checking value (T) that is pre-stored within operation processing unit 3 are compared to computing, obtain the temperature gap between actual environment temperature value and temperature checking value;
Then, the public output of change-over switch 5 is switched and is connected to reference voltage input terminal, make operation processing unit 3 obtain the reference voltage level under current environment temperature by metering circuit 4, again this reference voltage level and temperature gap obtained above are carried out to computing by operation processing unit 3, obtain the reference modified value under current environment temperature;
Then, the public output of change-over switch 5 is switched and is connected to voltage measurement input end, make operation processing unit 3 obtain drawing under current environment temperature by metering circuit 4 and carry magnitude of voltage, again drawing under this current environment temperature carried to magnitude of voltage and with reference to modified value, by operation processing unit 3, compare computing with obtained above, obtain the actual year magnitude of voltage that draws under current environment temperature;
Then, the public output of change-over switch 5 is switched and is connected to current measurement input end, make operation processing unit 3 obtain the pulling load current value under current environment temperature by metering circuit 4, by the pulling load current value under this current environment temperature and obtained abovely compare computing with reference to modified value by operation processing unit 3, obtain the actual pulling load current value under current environment temperature again;
Then, by operation processing unit 3, draw the actual pulling load current value of carrying under magnitude of voltage or current environment temperature to compare computing with the setting value that is pre-stored within operation processing unit 3 actual under current environment temperature obtained above, obtain accurate modified value, this accurate modified value is exported to and draws live road 7, to change the live that draws drawing in live road 7, press or pulling load current, make to draw drawing year magnitude of voltage or pulling load current value in live road 7 to be revised accurately.
Therefore, the accurate dual-temperature correction circuit of electronic load of the present utility model, by for monitoring operating ambient temperature and using extremely low temperature coefficient reference source to feed back, to other measurement in circuit and draw and carry components and parts because the test that temperature drift causes and draw and carry an error and revise is guaranteed in different working time sections and the measurement under different temperatures background and draws the precision of carrying value.Wherein, by obtaining the reference modified value under current environment temperature, by reference to modified value, drawing under the current environment temperature measuring being carried to value again revises, to eliminate the factor impacts such as temperature drift of circuit elements device, thereby obtain actual under current environment temperature, draw and carry a value, be the first rebuilding just; Then, by the actual setting value of carrying value and being pre-stored within operation processing unit 3 of drawing under current environment temperature, compare computing again, obtain accurate modified value, this accurate modified value is exported to and draws live road 7, to change, draw drawing in live road 7 to carry value, make to draw drawing in live road 7 to carry a value and revised accurately, be the second rebuilding just.So the accurate dual-temperature correction circuit of electronic load of the present utility model, by dual precision temperature correction, can be eliminated the factor impacts such as temperature drift of circuit elements device substantially, reduces error, make to draw drawing in live road 7 to carry value and revised accurately.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not restriction to the utility model protection domain; although the utility model has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not depart from essence and the scope of technical solutions of the utility model.
Claims (3)
1. an accurate dual-temperature correction circuit for electronic load, is characterized in that: comprise ambient temperature measurement module, operation processing unit, metering circuit, change-over switch, draw live road;
Described ambient temperature measurement module is connected with the temperature signal input end of described operation processing unit, makes described operation processing unit measure current actual environment temperature value by described ambient temperature measurement module;
Described change-over switch is provided with current measurement input end, voltage measurement input end, for measuring the reference voltage input terminal of the reference voltage level under current environment temperature, public output, described public output is changeable is connected to described current measurement input end, voltage measurement input end or reference voltage input terminal, described current measurement input end with described in draw the current feedback terminal on live road to be connected, described voltage measurement input end with described in draw the pressure feedback port on live road to be connected, described public output is connected with the measuring-signal input end of described operation processing unit by described metering circuit,
The output terminal of described operation processing unit with described in draw the control end on live road to be connected, described in draw the test lead on live road to be connected with tested power supply.
2. the accurate dual-temperature correction circuit of electronic load according to claim 1, it is characterized in that: described ambient temperature measurement module comprises environment temperature sensor, temperature measuring circuit, described environment temperature sensor is connected with the input end of described temperature measuring circuit, and the output terminal of described temperature measuring circuit is connected with the temperature signal input end of described operation processing unit.
3. the accurate dual-temperature correction circuit of electronic load according to claim 1, it is characterized in that: the output terminal of described operation processing unit and described in draw between the control end on live road and be connected with D/A change-over circuit, the input end of described D/A change-over circuit is connected with the output terminal of described operation processing unit, the output terminal of described D/A change-over circuit with described in draw the control end on live road to be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320364951.8U CN203414580U (en) | 2013-06-24 | 2013-06-24 | Precision dual temperature correction circuit of electronic load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320364951.8U CN203414580U (en) | 2013-06-24 | 2013-06-24 | Precision dual temperature correction circuit of electronic load |
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| Publication Number | Publication Date |
|---|---|
| CN203414580U true CN203414580U (en) | 2014-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320364951.8U Expired - Lifetime CN203414580U (en) | 2013-06-24 | 2013-06-24 | Precision dual temperature correction circuit of electronic load |
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| CN (1) | CN203414580U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103383439A (en) * | 2013-06-24 | 2013-11-06 | 吴锦来 | Electronic load precise dual-temperature correction method and circuit |
| CN113884960A (en) * | 2020-07-02 | 2022-01-04 | 广州雷迅创新科技股份有限公司 | High-precision calibration method for current measured by shunt method |
-
2013
- 2013-06-24 CN CN201320364951.8U patent/CN203414580U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103383439A (en) * | 2013-06-24 | 2013-11-06 | 吴锦来 | Electronic load precise dual-temperature correction method and circuit |
| CN103383439B (en) * | 2013-06-24 | 2015-12-23 | 吴锦来 | A kind of accurate dual-temperature modification method of electronic load and circuit |
| CN113884960A (en) * | 2020-07-02 | 2022-01-04 | 广州雷迅创新科技股份有限公司 | High-precision calibration method for current measured by shunt method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140129 Effective date of abandoning: 20151223 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |