CN101988960B - Digital electric meter capable of dynamically compensating and correcting reading - Google Patents
Digital electric meter capable of dynamically compensating and correcting reading Download PDFInfo
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- CN101988960B CN101988960B CN 200910168026 CN200910168026A CN101988960B CN 101988960 B CN101988960 B CN 101988960B CN 200910168026 CN200910168026 CN 200910168026 CN 200910168026 A CN200910168026 A CN 200910168026A CN 101988960 B CN101988960 B CN 101988960B
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Abstract
The invention relates to a digital electric meter capable of dynamically compensating and correcting reading. The digital electric meter comprises an OP amplifier, an analog-digital converter, a microprocessor and a display; wherein the input terminal of the OP amplifier is provided with a detector, and the input terminal is further provided with a dynamic compensating unit, the dynamic compensating unit can generate different bias voltage values along with ambient temperature variation, and the bias voltage value is dynamically applied onto the input terminal of the OP amplifier, thus compensating and correcting zero drift caused by the OP amplifier owning to ambient temperature variation, so that detection reading of the digital electric meter is not influenced by ambient temperature and is more accurate.
Description
[technical field]
The present invention about a kind of capable of dynamic compensation revise the digital electric meter of reading, espespecially a kind ofly can effectively solve the digital electric meter that causes the reading error problem because of ambient temperature effect.
[background technology]
By the electric circuit constitute that has digital electric meter now roughly as shown in Figure 2, it includes a microprocessor 70, an OP amplifier 71, a detecting device 72, a display 73 and an analog-digital converter 74; Wherein:
This detecting device 72 is to be located on the input end of OP amplifier 71, amplify and carry out signal by the detection signal that 71 pairs of detecting devices 72 of OP amplifier are sent analog form, the output terminal of this OP amplifier 71 then sees through analog-digital converter 74 and is connected with one of microprocessor 70 input end, in order to the signal of analog form is converted to digital signal, deliver to again microprocessor 70, export display 73 to by microprocessor 70 and detect reading to show.
From the above, comprised the OP amplifier in the electric circuit constitute of digital electric meter, the ideal curve phantom line segments system of general OP amp.in Vin and output end vo ut as shown in Figure 3, this ideal curve should pass through zero point in theory, but its actual curve real segment is not by presenting shift phenomenon zero point.Reaction is when the input end Vin of OP amplifier there is no input signal in the behaviour in service of reality, output voltage but appears in output end vo ut, reach as high as 1.6 volts, cause this kind shift phenomenon, main system is subjected to the factor affecting such as temperature variation, mains fluctuations, assembly wear out; And in the use occasion of digital electric meter, the principal element that causes skew is transistorized parameter temperature influence, because the environment temperature arround the digital electric meter changes, directly affected the accuracy of reading, see also curve map shown in Figure 4, transverse axis represents the analog signal magnitude of voltage that digital electric meter detects gained, and the longitudinal axis then represents the demonstration reading.According to the ideal curve phantom line segments, the corresponding corresponding reading D1 of magnitude of voltage V1 system of input, but because being subjected to influence of temperature change, make the actual curve real segment, thereby under identical input voltage value V1, but produce different reading D2, because aforementioned affect has caused the deviation of reading, must be revised.
The technological means that tradition OP amplifier solves drifting problem ties up to and adds a little fixed voltage on its input end and also claim input offset voltage, solves seeking.Yet the place at digital electric meter place is different, and more there are different environment temperatures and temperature variation in different sites, under this situation, even add a little fixed voltage, also can't cause in response to different environment temperatures bias phenomenon in various degree.
[summary of the invention]
Therefore, fundamental purpose of the present invention is providing a kind of digital electric meter that can detect in response to different environment temperature dynamic compensations reading, working as digital electric meter by this can be according to the temperature variation degree under different environment temperatures, the reading of correction-compensation digital electric meter appositely is to get rid of temperature variation for the impact of digital electric meter accuracy in detection.
Make aforementioned digital electric meter comprise for reaching the technical way system that aforementioned purpose takes:
One microprocessor;
One analog-digital converter is to be located on the input end of aforementioned microprocessor;
One OP amplifier, its output terminal system sees through aforementioned analog-digital converter and is connected with the input end of microprocessor;
One detecting device is to be located on the input end of aforementioned OP amplifier;
One display is to be located on the output terminal of aforementioned microprocessor;
One dynamic compensation unit is to be located on the input end of aforementioned OP amplifier, in order to producing the voltage with variation of ambient temperature, and dynamically is applied on the input end of OP amplifier;
When the work of aforementioned digital electric meter, be to detect voltage, current signal by detecting device, amplify through the OP amplifier and deliver to microprocessor after its signal and analog-digital converter are converted to digital form, sent by microprocessor again and show to display and to detect reading.And at the digital electric meter duration of work, occur changing such as environment temperature, then this dynamic compensation unit is with the variation of while along with environment temperature, input end at the OP amplifier applies different voltage, by this can be effectively and exactly compensation revise the shift phenomenon that the OP amplifier causes because of temperature variation, thereby can guarantee that digital electric meter detects the correctness of reading.
[description of drawings]
Fig. 1 is the circuit diagram of a preferred embodiment of the present invention.
Fig. 2 is the circuit diagram of existing digital electric meter.
Fig. 3 is the performance diagram of existing OP amplifier.
Fig. 4 is used in the performance diagram that measures analog signal in the digital electric meter for existing OP amplifier.
[primary clustering symbol description]
10 microprocessors, 11 displays
12 analog-digital converter 13OP amplifiers
14 detecting devices, 20 dynamic compensation unit
21 simulation multiplexers, 22 controllers
70 microprocessor 71OP amplifiers
72 detecting devices, 73 displays
74 analog-digital converters
[embodiment]
About one of the present invention preferred embodiment, see also shown in Figure 1, the output terminal that mainly lies in a microprocessor 10 is provided with a display 11, the input end of microprocessor 10 is provided with an analog-digital converter 12 again, and see through this analog-digital converter 12 and is connected with the output terminal of an OP amplifier 13, this OP amplifier 13 has that an anode is inputted and a negative terminal is inputted, in present embodiment, its anode input system connects a detecting device 14, to obtain the detection signal of analog form.
The technical characteristics of the present invention anode input that ties up to aforementioned OP amplifier 13 is provided with a dynamic compensation unit 20 again, the anode input of using dynamically at OP amplifier 13 applies different voltage, in order to compensate correction for the shift phenomenon that produces because of temperature variation.
In present embodiment, this dynamic compensation unit 20 comprises that a simulation multiplexer 21 and a control simulation multiplexer 21 switch the controller 22 of output; Wherein:
This simulation multiplexer 21 has plural input end, switching controls end and at least one output terminal, its output terminal system is connected with the anode input of OP amplifier 13, the switching controls end then is connected with controller 22, each input end system connects from the voltage V1 of different magnitudes of voltage～Vn respectively, each is organized voltage V1～Vn and represents respectively the bucking voltage of wanting under the different temperatures to be applied in the input of OP amplifier 13 anodes, under the state of OP amplifier 13 anodes input without the signal input, making OP amplifier 13 output terminals is zero.
Have temperature inductor in this controller 22, so that according to the environment temperature arround the digital electric meter that temperature inductor is detected, control simulation multiplexer 21 selections wherein one group of corresponding voltage are applied to the anode input of OP amplifier 13 upward to compensate and correct.Because under the environment for use of digital electric meter, its temperature cataclysm can not occur usually at short notice, therefore 22 need of controller periodically for example read the influence value of temperature inductor at set intervals every 12 seconds, can be appositely in response to the variation of ambient temperature of digital electric meter.
With regard to known realization technology, the controller 22 of aforementioned dynamic compensation unit 20 can be an assembly independently, also can be integrated in the microprocessor 10.
From the above, existing numerical digit ammeter inside is provided with an OP amplifier, for the amplification detection tolerance measure analog signal, only OP amplifier itself may produce shift phenomenon by Yin Wendu, so the present invention is based on product and the operating characteristic of digital electric meter, establish a dynamic compensation unit at the input end of OP amplifier, this dynamic compensation unit can produce different voltage under different environment temperatures, and be applied on the input end of OP amplifier, shift phenomenon so that compensation OP amplifier temperature influence is produced effectively solves existing digital electric meter measures accuracy because of ambient temperature effect problem by this.
Claims (3)
1. a capable of dynamic compensates the digital electric meter of revising reading, it is characterized in that: comprising:
One microprocessor;
One analog-digital converter is to be located on the input end of aforementioned microprocessor;
One OP amplifier, its output terminal system sees through aforementioned analog-digital converter and is connected with the input end of microprocessor;
One detecting device is to be located on the input end of aforementioned OP amplifier;
One display is to be located on the output terminal of aforementioned microprocessor;
One dynamic compensation unit is to be located on the input end of aforementioned OP amplifier, in order to producing the voltage with variation of ambient temperature, and dynamically is applied on the input end of OP amplifier, and described dynamic compensation unit comprises:
One simulation multiplexer, have plural input end, switching controls end and at least one output terminal, its output terminal system is connected with the input end of OP amplifier, each input end system connects from the voltage of different magnitudes of voltage respectively, and each is organized voltage and represents respectively the bucking voltage of wanting under the different temperatures to be applied on the OP amp.in;
One controller, its output terminal system is connected with the switching controls end of simulation multiplexer, have temperature inductor in this controller, read the influence value of temperature inductor controller cycle, with according to the environment temperature arround the digital electric meter that temperature inductor is detected, the control simulation multiplexer selects the voltage of a correspondence to be applied on the input end of OP amplifier.
2. the digital electric meter of reading is revised in capable of dynamic compensation as claimed in claim 1, it is characterized in that: the controller system of described dynamic compensation unit is integrated in the microprocessor.
3. the digital electric meter of reading is revised in capable of dynamic compensation as claimed in claim 1 or 2, it is characterized in that: described OP amplifier has anode input and negative terminal input, and this anode input is connected with the output terminal of detecting device and dynamic compensation unit respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910168026 CN101988960B (en) | 2009-08-07 | 2009-08-07 | Digital electric meter capable of dynamically compensating and correcting reading |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910168026 CN101988960B (en) | 2009-08-07 | 2009-08-07 | Digital electric meter capable of dynamically compensating and correcting reading |
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| Publication Number | Publication Date |
|---|---|
| CN101988960A CN101988960A (en) | 2011-03-23 |
| CN101988960B true CN101988960B (en) | 2013-03-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200910168026 Expired - Fee Related CN101988960B (en) | 2009-08-07 | 2009-08-07 | Digital electric meter capable of dynamically compensating and correcting reading |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103995247A (en) * | 2014-05-28 | 2014-08-20 | 国家电网公司 | Electric energy meter calibrating apparatus for anechoic chamber |
| CN104965186B (en) * | 2015-05-21 | 2017-08-04 | 杭州西力电能表制造有限公司 | The calibration method compensated automatically electric energy meter electric energy metering error according to temperature |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2274776Y (en) * | 1996-10-16 | 1998-02-18 | 江阴长江电子实业总公司 | Three phase transferring intellectual meter |
| CN1315661A (en) * | 2000-03-30 | 2001-10-03 | 华为技术有限公司 | Method and device for measuring standing-wave ratio |
| CN2572692Y (en) * | 2002-01-29 | 2003-09-10 | 苏州维运科技有限公司 | Power frequency test centralized warning instrument |
| CN2589994Y (en) * | 2002-12-13 | 2003-12-03 | 南京华卓电子实业有限公司 | Portable voltage detecting instrument |
| CN101308691A (en) * | 2008-06-18 | 2008-11-19 | 北京博创汉威科技有限责任公司 | High-resolution disc signal quality detection apparatus |
| CN101334430A (en) * | 2007-06-29 | 2008-12-31 | 吴伟 | High accuracy electric current and temperature on-line detection device and its sampling method |
| CN101499254A (en) * | 2008-02-01 | 2009-08-05 | 瑞昱半导体股份有限公司 | Reducing thermal drift phenomenon by temperature detector in display system |
-
2009
- 2009-08-07 CN CN 200910168026 patent/CN101988960B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2274776Y (en) * | 1996-10-16 | 1998-02-18 | 江阴长江电子实业总公司 | Three phase transferring intellectual meter |
| CN1315661A (en) * | 2000-03-30 | 2001-10-03 | 华为技术有限公司 | Method and device for measuring standing-wave ratio |
| CN2572692Y (en) * | 2002-01-29 | 2003-09-10 | 苏州维运科技有限公司 | Power frequency test centralized warning instrument |
| CN2589994Y (en) * | 2002-12-13 | 2003-12-03 | 南京华卓电子实业有限公司 | Portable voltage detecting instrument |
| CN101334430A (en) * | 2007-06-29 | 2008-12-31 | 吴伟 | High accuracy electric current and temperature on-line detection device and its sampling method |
| CN101499254A (en) * | 2008-02-01 | 2009-08-05 | 瑞昱半导体股份有限公司 | Reducing thermal drift phenomenon by temperature detector in display system |
| CN101308691A (en) * | 2008-06-18 | 2008-11-19 | 北京博创汉威科技有限责任公司 | High-resolution disc signal quality detection apparatus |
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| CN101988960A (en) | 2011-03-23 |
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