CN201063603Y - True effective value converting circuit with low temperature drift - Google Patents
True effective value converting circuit with low temperature drift Download PDFInfo
- Publication number
- CN201063603Y CN201063603Y CNU2007200697285U CN200720069728U CN201063603Y CN 201063603 Y CN201063603 Y CN 201063603Y CN U2007200697285 U CNU2007200697285 U CN U2007200697285U CN 200720069728 U CN200720069728 U CN 200720069728U CN 201063603 Y CN201063603 Y CN 201063603Y
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- low temperature
- modular converter
- discharge circuit
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Abstract
The utility model provides a true effective value converting circuit with low temperature shift, comprising a true effective value converting module and a dual operational amplifying circuit, wherein the dual operational amplifying circuit is divided into a first operational amplifying circuit and a second operational amplifying circuit; the output end of the first operational amplifying circuit is connected with the input end of the true effective value converting module; the input end of the second operational amplifying circuit is connected with the output end of the true effective value converting module; the first operational amplifying circuit is used as the input signal attenuator of the true effective value converting module, and output an input signal into the true effective value converting module after attenuating the input signal; the second operational amplifying circuit is used as the converted output signal amplifier of the true effective value converting module to amplify the signal from the true effective value converting module. The utility model has the advantages of high measuring accuracy, ideal stability and low temperature shift.
Description
Technical field
The utility model relates to a kind of real effective change-over circuit, relates in particular to a kind of real effective change-over circuit that low temperature floats that has.
Technical background
Real effective conversion chip of the prior art (model AD736), mainly by input amplifier, full-wave rectifier, the effective value core, output amplifier and biasing circuit are formed, because input amplifier, full-wave rectifier and effective value core may have direct current offset, so in actual applications, its input must add attenuator, its output need add amplifier, but owing to added this two-part circuit, can introduce temperature drift, cause the precision and the stability of whole real effective change-over circuit to descend, the overall performance that also can have influence on the instrument at real effective circuit place simultaneously descends.
Summary of the invention
The purpose of this utility model is the defective of prior art, and a kind of real effective change-over circuit that low temperature floats that has is provided, and it has accuracy of measurement height, stability is good, low temperature floats advantage.
The technical scheme that realizes above-mentioned purpose is: a kind of have a real effective change-over circuit that low temperature floats, comprise a real effective modular converter, wherein, also comprise a pair of discharge circuit, this double operational circuit is divided into first discharge circuit and second discharge circuit, the output of first discharge circuit links to each other with the input of real effective modular converter, and the input of second discharge circuit links to each other with the output of real effective modular converter, wherein:
First discharge circuit is used for the attenuated input signal device as the real effective modular converter, exports to the real effective modular converter after its signal attenuation with input;
Second discharge circuit is used for the converted output signal amplifier as the real effective modular converter, and it will amplify from the signal of real effective modular converter.
Above-mentioned a kind of real effective change-over circuit that low temperature floats that has, wherein, described first discharge circuit comprises one first operational amplifier, its positive input terminal end 3 is connected to first resistance R 1, negative input end end 2 is connected to second resistance R 2, and string has the 3rd resistance R 3 between output end 1 and the negative input end end 2.
Above-mentioned a kind of real effective change-over circuit that low temperature floats that has, wherein, the resistance of described first resistance R 1 and second resistance R 2 equates.
Above-mentioned a kind of real effective change-over circuit that low temperature floats that has, wherein, described second discharge circuit comprises one second operational amplifier, its positive input terminal end 5 is connected to the 4th resistance R 4, negative input end end 6 is connected to the 5th resistance R 5, string has the 6th resistance R 6 between output end 7 and the negative input end end 6, and the other end of described the 4th resistance R 4 links to each other with the output of real effective modular converter, the other end ground connection of described the 5th resistance R 5.
Above-mentioned a kind of real effective change-over circuit that low temperature floats that has, wherein, the resistance of described the 4th resistance R 4 and the 5th resistance R 5 equates.
The beneficial effects of the utility model are: the utility model is a kind of to have real effective change-over circuit that low temperature floats owing to adopted the double operational circuit, solved the problem of temperature drift, make this real effective change-over circuit have excellent measurement accuracy, stability, and temperature drift is low.
Description of drawings
Fig. 1 is a kind of circuit diagram with real effective change-over circuit that low temperature floats of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
See also Fig. 1, there is shown a kind of real effective change-over circuit that low temperature floats that has of the present utility model, comprise a real effective modular converter 2 and a pair of discharge circuit, this double operational circuit is divided into first discharge circuit 11 and second discharge circuit 12, the output of first discharge circuit 11 links to each other with the input of real effective modular converter 2, the input of second discharge circuit 12 links to each other with the output of real effective modular converter 2, wherein:
Second discharge circuit 12, be used for converted output signal amplifier as real effective modular converter 2, it will amplify from the signal of real effective modular converter 2, it comprises one second operational amplifier 121, its positive input terminal end 5 is connected to the 4th resistance R 4, negative input end end 6 is connected to the 5th resistance R 5, string has the 6th resistance R 6 between output end 7 and the negative input end end 6, the end 8 of second operational amplifier 121 connects+the 5V power supply, end 4 connects-the 5V power supply, the other end of the 4th resistance R 4 links to each other with the output of real effective modular converter 2, the other end ground connection of the 5th resistance R 5, and wherein the resistance of the 4th resistance R 4 and the 5th resistance R 5 equates;
Real effective modular converter 2, be used for signal is carried out the real effective conversion, adopted a real effective conversion chip in the present embodiment, model is AD736, be in series with the first electrochemical capacitor EC1 between its end 1 and the end 8, the anode of the first electrochemical capacitor EC1 links to each other with end 1, negative terminal links to each other with end 8, end 2 links to each other with the output end 1 of first operational amplifier 111, be in series with the 3rd electrochemical capacitor EC3 between the end 3 of chip and the end 6, the negative terminal of the 3rd electrochemical capacitor EC3 links to each other with end 3, negative terminal links to each other with end 6, and the negative terminal of the 3rd electrochemical capacitor EC3 is also by one the 3rd capacitor C, 3 back ground connection, be in series with the second electrochemical capacitor EC2 between the end 4 of chip and the end 5, the anode of the second electrochemical capacitor EC2 links to each other with end 5, negative terminal links to each other with end 4, end 4 also distinguishes-and the 5V power supply links to each other with second capacitor C 2, the other end ground connection of second capacitor C 2, the end 6 of chip links to each other with the input of the 4th resistance R 4 of second discharge circuit, end 7 links to each other with+5V power supply, should+also by first capacitor C, 1 back ground connection, end 8 also links to each other with the earth terminal of first capacitor C 1 the 5V power supply.
In sum, the utility model can guarantee the 200mV full scale applied signal voltage of AD736 chip, simultaneously there is the conversion output voltage about 0～2V to import again, solved the temperature drift problem well, have good accuracy of measurement, stability and low temperature and float for A/D converter.
Above embodiment is only for the usefulness of explanation the utility model, but not to the restriction of the utility model protection range.Relevant those skilled in the art; under the situation that does not break away from spirit and scope of the present utility model; can also make various conversion or modification, and the technical scheme that all are equal to should belong to also within the category of the utility model protection, is limited by each claim.
Claims (5)
1. one kind has the real effective change-over circuit that low temperature floats, comprise a real effective modular converter, it is characterized in that: also comprise a pair of discharge circuit, this double operational circuit is divided into first discharge circuit and second discharge circuit, the output of first discharge circuit links to each other with the input of real effective modular converter, the input of second discharge circuit links to each other with the output of real effective modular converter, wherein:
First discharge circuit is used for the attenuated input signal device as the real effective modular converter, exports to the real effective modular converter after its signal attenuation with input;
Second discharge circuit is used for the converted output signal amplifier as the real effective modular converter, and it will amplify from the signal of real effective modular converter.
2. a kind of real effective change-over circuit that low temperature floats that has according to claim 1, it is characterized in that: described first discharge circuit comprises one first operational amplifier, its positive input terminal end 3 is connected to first resistance R 1, negative input end end 2 is connected to second resistance R 2, and string has the 3rd resistance R 3 between output end 1 and the negative input end end 2.
3. a kind of real effective change-over circuit that low temperature floats that has according to claim 2 is characterized in that: the resistance of described first resistance R 1 and second resistance R 2 equates.
4. a kind of real effective change-over circuit that low temperature floats that has according to claim 1, it is characterized in that: described second discharge circuit comprises one second operational amplifier, its positive input terminal end 5 is connected to the 4th resistance R 4, negative input end end 6 is connected to the 5th resistance R 5, string has the 6th resistance R 6 between output end 7 and the negative input end end 6, the other end of described the 4th resistance R 4 links to each other with the output of real effective modular converter, the other end ground connection of described the 5th resistance R 5.
5. a kind of real effective change-over circuit that low temperature floats that has according to claim 4 is characterized in that: the resistance of described the 4th resistance R 4 and the 5th resistance R 5 equates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200697285U CN201063603Y (en) | 2007-05-10 | 2007-05-10 | True effective value converting circuit with low temperature drift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200697285U CN201063603Y (en) | 2007-05-10 | 2007-05-10 | True effective value converting circuit with low temperature drift |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201063603Y true CN201063603Y (en) | 2008-05-21 |
Family
ID=39451989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200697285U Expired - Fee Related CN201063603Y (en) | 2007-05-10 | 2007-05-10 | True effective value converting circuit with low temperature drift |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201063603Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044445A (en) * | 2015-06-09 | 2015-11-11 | 上海鼎灿投资咨询有限公司 | Voltage-current electric quantity real-time monitoring and remote transmission system |
| CN106325152A (en) * | 2016-08-22 | 2017-01-11 | 四川华索自动化信息工程有限公司 | Frequency error correction type flue pipe temperature monitoring system based on Internet-of-things technology |
-
2007
- 2007-05-10 CN CNU2007200697285U patent/CN201063603Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044445A (en) * | 2015-06-09 | 2015-11-11 | 上海鼎灿投资咨询有限公司 | Voltage-current electric quantity real-time monitoring and remote transmission system |
| CN106325152A (en) * | 2016-08-22 | 2017-01-11 | 四川华索自动化信息工程有限公司 | Frequency error correction type flue pipe temperature monitoring system based on Internet-of-things technology |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Ling Jianfeng Inventor after: Li Chengyao Inventor after: Li Chunhua Inventor after: Hu Longsheng Inventor after: Zhao Xijun Inventor after: Huang Jinchuan Inventor after: Xu Kun Inventor after: Yao Guangde Inventor before: Huang Jinchuan Inventor before: Xu Kun Inventor before: Yao Guangde |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: HUANG JINCHUAN; XU KUN; YAO GUANGDE TO: LING JIANFENG; LI CHENGYAO; LI CHUNHUA; HU LONGSHENG; ZHAO XIJUN; HUANG JINCHUAN; XU KUN; YAO GUANGDE |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080521 Termination date: 20120510 |