CN101988960A - 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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- CN101988960A CN101988960A CN2009101680266A CN200910168026A CN101988960A CN 101988960 A CN101988960 A CN 101988960A CN 2009101680266 A CN2009101680266 A CN 2009101680266A CN 200910168026 A CN200910168026 A CN 200910168026A CN 101988960 A CN101988960 A CN 101988960A
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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]
But the present invention is about a kind of digital electric meter of dynamic compensation correction reading, refers to especially a kind ofly can effectively solve the digital electric meter that causes the reading error problem because of ambient temperature effect.
[background technology]
Circuit by existing digital electric meter is formed roughly as shown in Figure 2, and 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, so that the signal of analog form is converted to digital signal, deliver to microprocessor 70 again, export display 73 to by microprocessor 70 and detect reading to show.
From the above, the circuit of digital electric meter has comprised the OP amplifier in forming, 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.Being reflected at actual behaviour in service is when OP amplifier input terminal Vin there is no input signal, 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 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 influenced the accuracy of reading, see also curve map shown in Figure 4, on behalf of digital electric meter, transverse axis detect the analog signal magnitude of voltage of gained, and the longitudinal axis is then represented 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 of 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,, must be revised because aforementioned affect has caused the deviation of reading.
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 difference at digital electric meter place, 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 bias phenomenon in various degree in response to different environment temperatures.
[summary of the invention]
Therefore, fundamental purpose of the present invention is providing a kind of digital electric meter that can detect reading in response to different environment temperature dynamic compensations, 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 the influence of temperature variation for the digital electric meter accuracy in detection.
Make aforementioned digital electric meter comprise for reaching the major technique means 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 aforementioned OP amplifier input terminal;
One display is to be located on the output terminal of aforementioned microprocessor;
One dynamic compensation unit is to be located on the aforementioned OP amplifier input terminal, in order to producing the voltage with variation of ambient temperature, and dynamically is applied on the OP amplifier input terminal;
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, send by microprocessor again and show to display and to detect reading.And at the digital electric meter duration of work, occur changing as environment temperature, then this dynamic compensation unit is with the variation of while along with environment temperature, on the OP amplifier input terminal, apply different voltage, by this can be effectively and exactly compensation revise the OP amplifier because of the shift phenomenon that temperature variation caused, 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 imported and a negative terminal is imported, in present embodiment, its anode input system connects a detecting device 14, to obtain the detection signal of analog form.
The anode input that major technique feature of the present invention again ties up to aforementioned OP amplifier 13 is provided with a dynamic compensation unit 20, the anode input of using dynamically at OP amplifier 13 applies different voltage, so that at compensating correction because of shift phenomenon that temperature variation produced.
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 with the voltage V1～Vn of different magnitudes of voltage respectively, each is organized voltage V1～Vn and represents the bucking voltage of desiring under the different temperatures to be applied in the input of OP amplifier 13 anodes respectively, under the state of the no signal input of OP amplifier 13 anodes 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, the control simulation multiplexer 21 selections wherein voltage of one group of correspondence 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 the product and the operating characteristic of digital electric meter, on the OP amplifier input terminal, establish a dynamic compensation unit, this dynamic compensation unit can produce different voltage under different environment temperatures, and be applied on the OP amplifier input terminal, 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 (4)
1. but the digital electric meter of a dynamic compensation correction reading 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 aforementioned OP amplifier input terminal;
One display is to be located on the output terminal of aforementioned microprocessor;
One dynamic compensation unit is to be located on the aforementioned OP amplifier input terminal, in order to producing the voltage with variation of ambient temperature, and dynamically is applied on the OP amplifier input terminal.
2. but the digital electric meter of dynamic compensation correction reading as claimed in claim 1 is characterized in that: 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 OP amplifier input terminal, each input end system connects with the voltage of different magnitudes of voltage respectively, and each is organized voltage and represents the bucking voltage of desiring under the different temperatures to be applied on the OP amp.in respectively;
One controller, its output terminal system is connected with the switching controls end of simulation multiplexer, have temperature inductor in this controller,, control the simulation multiplexer and select the voltage of a correspondence to be applied on the OP amplifier input terminal with according to the environment temperature arround the digital electric meter that temperature inductor is detected.
3. but the digital electric meter of dynamic compensation correction reading as claimed in claim 2 is characterized in that: the controller system of described dynamic compensation unit is integrated in the microprocessor.
4. but as the digital electric meter of the arbitrary described dynamic compensation correction reading of claim 1-3, 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 true CN101988960A (en) | 2011-03-23 |
| CN101988960B 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995247A (en) * | 2014-05-28 | 2014-08-20 | 国家电网公司 | Electric energy meter calibrating apparatus for anechoic chamber |
| CN104965186A (en) * | 2015-05-21 | 2015-10-07 | 杭州西力电能表制造有限公司 | Calibration method for automatically compensating electric energy metering error of electric energy meter according to temperature |
Family Cites Families (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 |
| CN1134670C (en) * | 2000-03-30 | 2004-01-14 | 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 |
| CN101334430B (en) * | 2007-06-29 | 2012-07-18 | 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 |
| CN101308691B (en) * | 2008-06-18 | 2011-01-19 | 北京博创汉威科技有限责任公司 | High-resolution disc signal quality detection apparatus |
-
2009
- 2009-08-07 CN CN 200910168026 patent/CN101988960B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103995247A (en) * | 2014-05-28 | 2014-08-20 | 国家电网公司 | Electric energy meter calibrating apparatus for anechoic chamber |
| CN104965186A (en) * | 2015-05-21 | 2015-10-07 | 杭州西力电能表制造有限公司 | Calibration method for automatically compensating electric energy metering error of electric energy meter according to temperature |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN101988960B (en) | 2013-03-06 |
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Granted publication date: 20130306 Termination date: 20180807 |