CN204116449U - Based on the electric current precision metering device of satellite navigation system - Google Patents
Based on the electric current precision metering device of satellite navigation system Download PDFInfo
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- CN204116449U CN204116449U CN201420672400.2U CN201420672400U CN204116449U CN 204116449 U CN204116449 U CN 204116449U CN 201420672400 U CN201420672400 U CN 201420672400U CN 204116449 U CN204116449 U CN 204116449U
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Abstract
The utility model discloses the electric current precision metering device based on satellite navigation system, it comprises current-frequency modular converter, processing module and satellite time transfer module, the input end of described current-frequency modular converter connects current signal to be measured, and the output terminal of current-frequency modular converter is connected with processing module; Described satellite time transfer module receives time signal from satellite navigation system and extracts clock signal, the clock of satellite time transfer module exports and is connected with the input end of clock of current-frequency modular converter and processing module respectively, for current-frequency modular converter and processing module provide clock reference.The high accurate clock signal that the utility model utilizes current-frequency modular converter and satellite navigation system to provide, can measure the size of tested current signal, realize the precision of electric current, accurate-metering.
Description
Technical field
The utility model relates to the delicate metering field of signal, particularly relates to a kind of electric current precision metering device based on satellite navigation system.
Background technology
At present, the measurement of current signal uses to measure through the current measurement instrument of periodic calibration.This current measurement instrument need, by national verification regulatory requirements, send metering validation activity to examine and determine within a certain period of time, to ensure accuracy and the reliability of this current measurement instrument.
The object regularly sending metering validation activity to examine and determine is: the transmission of value, i.e. the tractability of value.All surveying instruments are made to have unified standard.But this regular censorship magnitude tracing mode, concerning censorship unit, need increase extra time cost and human cost, the censorship cycle is frequent.
And this regular censorship transmission of quantity value mode, concerning metering validation activity, classification is needed to carry out the transmission of value, and transmission of can not bypassing the immediate leadership, as transmission of quantity value is given provincial metering validation activity by central metering validation activity, provincial metering validation activity again by transmission of quantity value to city-level metering validation activity, city-level metering validation activity again transmission of quantity value to next stage metering validation activity.In the process of this classification transmission of quantity value, possible produced problem is: in every one-level transmission of quantity value process, all may produce certain error, due to the accumulation of value error, the accuracy of measuring of most subordinate metering validation activity must be caused not high.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of electric current precision metering device based on satellite navigation system is provided, utilize voltage-frequency modular converter and satellite time transfer module, realize under any workplace, temperature, humidity, the AC and DC electric current signal of precision measurement input, and realized all kinds of signal delicate metering being convertible into voltage, electric current by signal converter, examining and determine without the need to regularly delivering to measuring examination and determination organization again, avoiding the problem that traditional magnitude tracing and transmission of quantity value mode are brought.
The purpose of this utility model is achieved through the following technical solutions: based on the electric current precision metering device of satellite navigation system, and it comprises current-frequency modular converter, processing module and satellite time transfer module.
The input end of described current-frequency modular converter connects current signal to be measured, and the output terminal of current-frequency modular converter is connected with processing module; Described satellite time transfer module receives time signal from satellite navigation system and extracts clock signal, the clock of satellite time transfer module exports and is connected with the input end of clock of current-frequency modular converter and processing module respectively, for current-frequency modular converter and processing module provide clock reference.
Described current-frequency modular converter comprises current-voltage modular converter and voltage-frequency modular converter.
The input end of described current-voltage modular converter connects current signal to be measured, and the output terminal of current-voltage modular converter is connected with the input end of voltage-frequency modular converter, and the output terminal of voltage-frequency modular converter is connected with processing module.
It also comprises current signal conditioning module, and the input end of described current signal conditioning module connects current signal to be measured, and the output terminal of current signal conditioning module is connected with the input end of current-frequency modular converter.
Described satellite time transfer module comprises gps satellite time service module, big-dipper satellite time service module, GLONASS satellite time transfer module and Galilean satellite time service module.
Described current-voltage modular converter comprises precision resister.
Described voltage signal comprises single-ended voltage signal and differential voltage signal.
It also comprises signal converter, the signal input part of described signal converter connects input signal to be measured, and convert input signal to be measured to current signal or voltage signal, then this current signal or voltage signal are exported to follow-up current-frequency modular converter.
It also comprises display module, and described display module exports with the measurement of processing module and is connected.
It also comprises communication interface, and described processing module realizes being connected with external equipment by communication interface, carries out exchanges data with external equipment.
It also comprises keyboard, and described keyboard is connected with processing module.
The beneficial effects of the utility model are: the utility model measuring apparatus can under any workplace, temperature, humidity, the AC and DC electric current signal of precision measurement input, and complete all kinds of signal delicate metering being convertible into voltage, electric current, examining and determine without the need to regularly delivering to measuring examination and determination organization again, avoiding the problem that traditional magnitude tracing and transmission of quantity value mode are brought.
Input signal is converted to current signal or voltage signal by signal converter by the utility model, by voltage-frequency convener technology, the amplitude of this voltage, electric current is converted to corresponding frequency signal, then the high accurate clock signal of satellite navigation system is utilized, measure the amplitude of tested voltage, current signal, thus realize the accurate accurate-metering of electric current and other signal.
The utility model measuring apparatus adopts can be provided the satellite time transfer module of high accurate clock signal and have the voltage-frequency modular converter of high stable characteristic, makes the measurement result of the utility model measuring apparatus have high precision.Due to satellite time transfer clock signal be accurate, credible, reliable, can trace to the source, make, by the measured value of this input signal measured by the utility model measuring apparatus, there is accuracy, credibility, reliability and tractability.
Because the utility model measuring apparatus has characteristic of can tracing to the source, therefore, its measurement result can be traced to the source, and meets the requirement of national metrological verification regulations.
Accompanying drawing explanation
Fig. 1 is the system principle diagram of a kind of electric current precision metering device based on satellite navigation system of the utility model;
Fig. 2 is the theory diagram of voltage-frequency modular converter AD652 chip in the utility model;
Fig. 3 is the another kind of system principle diagram based on the electric current precision metering device of satellite navigation system of the utility model.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail, but protection domain of the present utility model is not limited to the following stated.
As shown in Figure 1, based on the electric current precision metering device of satellite navigation system, it comprises current-frequency modular converter, processing module and satellite time transfer module.
The input end of described current-frequency modular converter connects current signal to be measured, and the output terminal of current-frequency modular converter is connected with processing module; Described satellite time transfer module receives time signal from satellite navigation system and extracts clock signal, the clock of satellite time transfer module exports and is connected with the input end of clock of current-frequency modular converter and processing module respectively, for current-frequency modular converter and processing module provide clock reference.
Described current-frequency modular converter comprises current-voltage modular converter and voltage-frequency modular converter.
The input end of described current-voltage modular converter connects current signal to be measured, and the output terminal of current-voltage modular converter is connected with the input end of voltage-frequency modular converter, and the output terminal of voltage-frequency modular converter is connected with processing module.
It also comprises current signal conditioning module, and the input end of described current signal conditioning module connects current signal to be measured, and the output terminal of current signal conditioning module is connected with the input end of current-frequency modular converter.Current signal conditioning module is used for carrying out gain, denoising to current signal to be measured.
Described satellite time transfer module comprises gps satellite time service module, big-dipper satellite time service module, GLONASS satellite time transfer module and Galilean satellite time service module.Satellite time transfer module is made up of satellite time transfer constant-temperature crystal oscillator.By the time difference between satellite time transfer time and high stability crystal oscillator, adopt and tame algorithm, in real time the clock accuracy of adjustment crystal oscillator.Ensure that supply V/F converter and the clock signal of processing module remain tracing to the source of high precision and clock.
Described current-voltage modular converter comprises precision resister.
Described voltage signal comprises single-ended voltage signal and differential voltage signal.
Described processing module is arm processor, can select STM32F108VET6 chip.
Described voltage-frequency modular converter and V/F converter are AD652 chip.The analog voltage of input or current signal are converted to the pulse be in proportion or the square-wave signal of output frequency and input signal by AD652 chip, and by the input of this frequency signal as processing module.
V/F converter AD652 chip is a powerful accurate analog to digital conversion application build module, the maximum full scale frequency of this chip can reach 2MHz, when output frequency is 100kHz, its nonlinearity erron representative value is 0.002%, when output frequency is 1MHz, its linearization error value reaches and is 0.005% to the maximum.
AD652 chip uses multiple conventional charge balance technique to perform translation function.It utilizes external clock to define Full-span output frequency, instead of depends on the stability of external capacitive.Therefore, its transport function is more stable, the linearity is higher, and this has very large benefit to single channel and multi-channel system.In its accurate low drifting reference voltage source and low-temperature coefficient sheet, film adjusting resistance makes gain drift minimum.In addition, initial gain error is down to less than 0.5% by laser wafer adjustment.
As shown in Figure 2, Fig. 2 is the theory diagram of V/F converter AD652 chip, and the analog voltage of input or current signal are converted to the pulse be in proportion or the square-wave signal of output frequency and input signal by AD652 chip.The conversion formula of output frequency signal F and input voltage signal Vin is as follows, and its derivation can see AD652 databook:
F＝(1/Ir*Rin*T
0)*Vin
In formula: in Ir-AD652 chip, constant current source is transferred to the charging current value of integrating capacitor;
The resistance of resistance Rin in Rin-AD652 chip;
T
0the cycle of-AD652 chip output frequency signal, the i.e. charge cycle of integrating capacitor.
The stability of electric current I r and resistance Rin only determines with the technique of AD652 chip.The impact of extraneous condition of work on electric current I r and resistance Rin is substantially negligible, and therefore electric current I r and resistance Rin can think constant.So output frequency F is directly proportional to the analog voltage Vin of input.Clock signal that the maximal value of AD652 chip output frequency F and stability are inputted by satellite time transfer module determines, substantially irrelevant with the precision of outer member, operating ambient temperature and humidity.
And cycle T
0by the clock control of AD652 chip, therefore the stability of external clock frequency and precision directly affects degree of stability and the linear error of output frequency signal.
The clock signal that satellite time transfer module inputs determines the scope of AD652 chip output frequency F, and the stability of the clock of AD652 chip also will affect the stability of output frequency F simultaneously.Owing to adopting the mode of satellite time transfer to provide clock signal, ensure that high stability and the high precision of AD652 chip clock input signal.Therefore AD652 chip can realize the V/F conversion of high linearity.The utility model measuring apparatus adopts can be provided the satellite time transfer module of high accurate clock signal and have the V/F converter of high stable characteristic, makes the measurement result of the utility model measuring apparatus have high precision.
Due to the utility model measuring apparatus adopt satellite time transfer as AD652 chip clock signal and gather timing, and satellite time transfer clock signal be accurate, credible, reliable, can trace to the source.Therefore by the measured value of this input signal measured by the utility model measuring apparatus, there is accuracy, credibility, reliability and tractability.
The utility model also comprises display module, and described display module exports with the measurement of processing module and is connected, and shows measurement result.
The utility model also comprises communication interface, and described processing module realizes being connected with external equipment by communication interface, carries out exchanges data with external equipment.
The utility model also comprises keyboard, and described keyboard is connected with processing module.
As shown in Figure 3, the utility model also comprises signal converter, the signal input part of described signal converter connects input signal to be measured, and converts input signal to be measured to current signal or voltage signal, then this current signal or voltage signal are exported to follow-up current-frequency modular converter.
The utility model also can set up signal converter, when the non-current signal of input signal, by signal converter, this input signal is converted to voltage signal or current signal, thus realizes the metering to this input signal.
Described signal converter comprises photoelectric sensor, pressure transducer, sound transducer, displacement transducer, speed pickup, Temperature Humidity Sensor, hardness transducer, density sensor etc., according to various sensor Parameter Switch relation separately, the numerical value of this sensor institute detected parameters can be measured by the utility model measuring apparatus.Such as, when input signal is light signal, needing the signal converter first by setting up, as photoelectric sensor, after converting this light signal to electric signal, then by V/F converter and processing module, completing the luminous intensity measurement of this light signal.
The utility model measuring apparatus adopts the voltage-frequency modular converter chip AD652 of high linearity, high stability, its input voltage is converted to the frequency signal be directly proportional to its input voltage size, then by processing module, timing sampling is carried out to the output frequency signal of AD652, obtain the size of input current to be measured with this.
Key point of the present utility model is, the clock source of voltage-frequency modular converter (AD652 chip) and the timing sampling cycle of processing module all carry out the high accurate clock signal that satellite navigation system provides, and ensure that the high precision of measurement result, credibility, reliability and tractability.
Claims (9)
1. based on the electric current precision metering device of satellite navigation system, it is characterized in that: it comprises current-frequency modular converter, processing module and satellite time transfer module;
The input end of described current-frequency modular converter connects current signal to be measured, and the output terminal of current-frequency modular converter is connected with processing module; Described satellite time transfer module receives time signal from satellite navigation system and extracts clock signal, the clock of satellite time transfer module exports and is connected with the input end of clock of current-frequency modular converter and processing module respectively, for current-frequency modular converter and processing module provide clock reference.
2. the electric current precision metering device based on satellite navigation system according to claim 1, is characterized in that: described current-frequency modular converter comprises current-voltage modular converter and voltage-frequency modular converter;
The input end of described current-voltage modular converter connects current signal to be measured, and the output terminal of current-voltage modular converter is connected with the input end of voltage-frequency modular converter, and the output terminal of voltage-frequency modular converter is connected with processing module.
3. the electric current precision metering device based on satellite navigation system according to claim 1, it is characterized in that: it also comprises current signal conditioning module, the input end of described current signal conditioning module connects current signal to be measured, and the output terminal of current signal conditioning module is connected with the input end of current-frequency modular converter.
4. the electric current precision metering device based on satellite navigation system according to claim 1, is characterized in that: described satellite time transfer module comprises gps satellite time service module, big-dipper satellite time service module, GLONASS satellite time transfer module and Galilean satellite time service module.
5. the electric current precision metering device based on satellite navigation system according to claim 2, is characterized in that: described current-voltage modular converter comprises precision resister.
6. the electric current precision metering device based on satellite navigation system according to claim 1, it is characterized in that: it also comprises signal converter, the signal input part of described signal converter connects input signal to be measured, and convert input signal to be measured to current signal or voltage signal, then this current signal or voltage signal are exported to follow-up current-frequency modular converter.
7. the electric current precision metering device based on satellite navigation system according to claim 1, is characterized in that: it also comprises display module, and described display module exports with the measurement of processing module and is connected.
8. the electric current precision metering device based on satellite navigation system according to claim 1, is characterized in that: it also comprises communication interface, and described processing module realizes being connected with external equipment by communication interface, carries out exchanges data with external equipment.
9. the electric current precision metering device based on satellite navigation system according to claim 1, it is characterized in that: it also comprises keyboard, described keyboard is connected with processing module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420672400.2U CN204116449U (en) | 2014-11-12 | 2014-11-12 | Based on the electric current precision metering device of satellite navigation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420672400.2U CN204116449U (en) | 2014-11-12 | 2014-11-12 | Based on the electric current precision metering device of satellite navigation system |
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| Publication Number | Publication Date |
|---|---|
| CN204116449U true CN204116449U (en) | 2015-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420672400.2U Expired - Fee Related CN204116449U (en) | 2014-11-12 | 2014-11-12 | Based on the electric current precision metering device of satellite navigation system |
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|---|---|
| CN (1) | CN204116449U (en) |
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2014
- 2014-11-12 CN CN201420672400.2U patent/CN204116449U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150121 Termination date: 20201112 |
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| CF01 | Termination of patent right due to non-payment of annual fee |