CN103217601A - Control method of ensuring accuracy of measurement device of electrical signals - Google Patents
Control method of ensuring accuracy of measurement device of electrical signals Download PDFInfo
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- CN103217601A CN103217601A CN2013100879279A CN201310087927A CN103217601A CN 103217601 A CN103217601 A CN 103217601A CN 2013100879279 A CN2013100879279 A CN 2013100879279A CN 201310087927 A CN201310087927 A CN 201310087927A CN 103217601 A CN103217601 A CN 103217601A
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Abstract
A control method of ensuring accuracy of a measurement device of electrical signals comprises the steps: firstly, detecting an input voltage and current signal and an output voltage and current signal of the measurement device of the electrical signals by a controller, and storing a result by the controller in a compensation meter of a storage which cannot be lost easily; secondly, providing a dynamic compensation and calculation method used for improving the accuracy of the measurement device of the electrical signals through a meter searching method; and thirdly, regarding the measurement device of the electrical signals as a black box, and conducting compensation on a voltage and current signal which is output at last. The control method is simple in structure, the accuracy of the measurement device of the electrical signals is improved under the premise of not increasing high cost, detection and calibration can be conducted again, the accuracy when the measurement device leaves a factory can be reached after the measurement device operates for a period of time and a measurement result drifts, and the control method is simple and reliable and has wide application prospect.
Description
Technical field
The invention belongs to test, field of measuring technique, particularly a kind of electric signal measurement equipment precision guarantees control method and device.
Background technology
Electric signal measurement equipment precision influence factor is many, the zero shift of the inner components and parts of mains frequency, voltage ripple of power network, device electronics for example, instability etc., therefore in precision and the stability of electric signal measurement equipment for guaranteeing to test, appropriate compensation tache must be set, the present invention is practicable aspect dynamic compensation, and realize easily, can compensate in real time, for raising is the sort of electric signal measurement equipment is sealed in the loop especially, the effect of for example testing electric automobile charging pile, charging set equipment precision is very obvious and useful.
Summary of the invention
The present invention is directed to the deficiencies in the prior art and defective, utilize look-up method, a kind of dynamic compensation and computing method that improve the electric signal measurement equipment precision are provided.
The objective of the invention is to realize by following technical solution.
A kind of electric signal measurement equipment precision guarantees control method, and the present invention is characterised in that step is:
The first step: monitoring control devices electric signal measurement equipment input voltage, current signal and output voltage, current signal, and the result is stored in a compensation meter of a nonvolatile memory;
Second step: utilize look-up method, a kind of dynamic compensation and computing method that improve the electric signal measurement equipment precision are provided;
The 3rd step: electric signal measurement equipment is regarded as a black box, its last voltage, current signal of exporting is compensated.
Compensation meter of the present invention, according to the electric signal measurement equipment precision requirement, precision is in the requirement of high 2 grades than original equipment the time, the power power that all errors is divided at least 22 is interval uniformly, each interval is when equipment dispatches from the factory or detection, during calibration according to least square method regulate make error amount be predefined hour, be compensated the modified value in the table, when controller by after tabling look-up at the corresponding interval voltage of seeking, the modified value of electric current, the modified value of electric current is scaled the modified value of resistance again, by exporting control signal to voltage regulator module after the frequency inverted, current adjusting module, make offset and original value add reducing at last, to get the numerical value that requires to the end.
Compensation meter of the present invention, the computation process of offset is at first according to which interval of the error amount judgement that designs in advance in the five equilibrium homogenising in the compensation meter, offset can be inserted between this compensating basin then, then according to the function that error delta is expressed as U output, I output, as δ=f (U output) * f (I output), regulate I output earlier, U output is regulated in the back, constitute dual circulation and regulate, until obtaining the suitable modified value that matches with hardware.
Compensation meter of the present invention, when precision after the correction of electric signal measurement equipment surpasses 2 class requirements of original equipment, the by stages then is not set etc., only be provided with between super and following superzone, between last superzone with following superzone between absolute value be the same, promptly have only ± interval of two ratings, when when revising the back precision and be no more than 2 class requirements again by etc. the by stages compensate, when exporting at 0.1 times of U, regulating error value in 0.1 doubly I exports, if regulating the back error amount can drop in error range than high 2 grades of original equipment requires, then enter the calculating of offset, simultaneously by etc. the by stages compensation of tabling look-up, if can not drop in the error range requirement than high 2 grades of original equipment, then can not compensate.
Compensation meter of the present invention, compensation meter has voltage, two offsets of electric current, at first electric current is revised, then just to the voltage correction, it is first Control current adjusting module output resistance compensating signal, control voltage regulator module output voltage compensation signal then, arrive designing requirement in advance to guarantee the electric signal measurement equipment precision.
The present invention regards electric signal measurement equipment as a black box, and its last voltage, current signal of exporting is compensated.A kind of electric signal measurement equipment precision guarantees that control method and device comprise controller, voltage regulator module and current adjusting module, controller is used to monitor electric signal measurement equipment input voltage, current signal and output voltage, current signal, what adopt when measurement output voltage, current signal is that four-end method is measured, and be the correspondent frequency signal with these conversion of signals, form closed-loop control, make input voltage, current signal and output voltage, current signal keep permissible accuracy; Voltage regulator module is used for measuring the voltage signal of the input of electric signal measurement equipment, output, and produces the voltage signal of compensation electric signal measurement equipment; Current adjusting module is used for measuring the current signal of the input of electric signal measurement equipment, output, and regulates the nonlinear resistance signal of generation compensation electric signal measurement device on resistance, adjusts current signal indirectly.
Look-up method provided by the invention adopts digitized five equilibrium section scale-checking method to carry out error compensation, when supposing independent regulation voltage, input voltage is V1, output voltage is V2, then the bucking voltage value at the output voltage place is V2-V1, be regulation voltage adjusting module output voltage V 2-V1, iterative compensation is until making electric signal measurement equipment reach default accuracy requirement.Originally table look-up compensation method by a large amount of evidences, its main core content is: according to the electric signal measurement equipment precision requirement, precision is in the requirement of high 2 grades than original equipment the time, the power power that all errors is divided at least 22 is interval uniformly, each interval is when equipment dispatches from the factory or detection, during calibration according to least square method regulate make error amount be predefined hour, be compensated the modified value in the table, when controller by after tabling look-up at the corresponding interval voltage of seeking, the modified value of electric current, the modified value of electric current is scaled the modified value of resistance again, by exporting control signal to voltage regulator module after the frequency inverted, current adjusting module, make offset and original value add reducing at last, to get the numerical value that requires to the end, wherein key a bit is voltage, two offsets of electric current, at first electric current is revised, then just to the voltage correction, simultaneously the offset that calculates is recorded in the compensation meter, compensation meter is stored on the nonvolatile memory, voltage is arranged, two offsets of electric current, at first electric current is revised, then just to the voltage correction, it is first Control current adjusting module output resistance compensating signal, control voltage regulator module output voltage compensation signal then, arrive designing requirement in advance to guarantee the electric signal measurement equipment precision.
When precision after the correction of electric signal measurement equipment surpasses 2 class requirements of original equipment, the by stages then is not set etc., only be provided with between super and following superzone, between last superzone with following superzone between absolute value be the same, promptly have only ± interval of two ratings, when when revising the back precision and be no more than 2 class requirements again by etc. the by stages compensate.
The present invention adopts the digital form of software implementation to carry out the compensation method of five equilibrium section scale-checking, carry out the hardware dynamic compensation by voltage regulator module and current adjusting module then, set up compensating circuit, its control circuit is very simple, reliability, precision is greatly improved, and digitized processing procedure is stable, after electric signal measurement equipment operation a period of time, after signal produces skew, can return factory again or arrive detection, calibration department rebulids compensation meter, the foundation of the concrete offset data of this compensation meter produces according to the computation process of Fig. 5, can reach default precision again, and is simple, reliably.
Principle of work of the present invention: controller is used to monitor electric signal measurement equipment input voltage, current signal and output voltage, current signal, and be the correspondent frequency signal with these conversion of signals, form closed-loop control, make input voltage, current signal and output voltage, current signal keep permissible accuracy; Voltage regulator module is used for measuring the voltage signal of the input of electric signal measurement equipment, output, and produces the voltage signal of compensation electric signal measurement equipment; Current adjusting module is used for measuring the current signal of the input of electric signal measurement equipment, output, and regulates the nonlinear resistance signal of generation compensation electric signal measurement device on resistance, adjusts current signal indirectly.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the controller cut-away view;
Fig. 3 is the current adjusting module structural drawing;
Fig. 4 is a process flow diagram when surpassing error range;
Fig. 5 is compensation value calculation figure.
Embodiment
A kind of electric signal measurement equipment precision guarantees control method, and the present invention is characterised in that step is:
The first step: monitoring control devices electric signal measurement equipment input voltage, current signal and output voltage, current signal, and the result is stored in a compensation meter of a nonvolatile memory;
Second step: utilize look-up method, a kind of dynamic compensation and computing method that improve the electric signal measurement equipment precision are provided;
The 3rd step: electric signal measurement equipment is regarded as a black box, its last voltage, current signal of exporting is compensated.
Compensation meter of the present invention, according to the electric signal measurement equipment precision requirement, precision is in the requirement of high 2 grades than original equipment the time, the power power that all errors is divided at least 22 is interval uniformly, each interval is when equipment dispatches from the factory or detection, during calibration according to least square method regulate make error amount be predefined hour, be compensated the modified value in the table, when controller by after tabling look-up at the corresponding interval voltage of seeking, the modified value of electric current, the modified value of electric current is scaled the modified value of resistance again, by exporting control signal to voltage regulator module after the frequency inverted, current adjusting module, make offset and original value add reducing at last, to get the numerical value that requires to the end.
Compensation meter of the present invention, the computation process of offset is at first according to which interval of the error amount judgement that designs in advance in the five equilibrium homogenising in the compensation meter, offset can be inserted between this compensating basin then, then according to the function that error delta is expressed as U output, I output, as δ=f (U output) * f (I output), regulate I output earlier, U output is regulated in the back, constitute dual circulation and regulate, until obtaining the suitable modified value that matches with hardware.
Compensation meter of the present invention, when precision after the correction of electric signal measurement equipment surpasses 2 class requirements of original equipment, the by stages then is not set etc., only be provided with between super and following superzone, between last superzone with following superzone between absolute value be the same, promptly have only ± interval of two ratings, when when revising the back precision and be no more than 2 class requirements again by etc. the by stages compensate, when exporting at 0.1 times of U, regulating error value in 0.1 doubly I exports, if regulating the back error amount can drop in error range than high 2 grades of original equipment requires, then enter the calculating of offset, simultaneously by etc. the by stages compensation of tabling look-up, if can not drop in the error range requirement than high 2 grades of original equipment, then can not compensate.
Compensation meter of the present invention, compensation meter has voltage, two offsets of electric current, at first electric current is revised, then just to the voltage correction, it is first Control current adjusting module output resistance compensating signal, control voltage regulator module output voltage compensation signal then, arrive designing requirement in advance to guarantee the electric signal measurement equipment precision.
Realize purpose of the present invention in conjunction with example shown in Figure 1, the formation of control method and method of attachment are: alternating current is input in the electric signal measurement equipment input end, the power input of electric signal measurement equipment output end reception measurement equipment, in another input end of output termination electric signal measurement equipment with Devices to test, voltage regulator module, the signal input end of current adjusting module connects controller, 2 voltage measurement ends of voltage regulator module connect the input end and the output terminal of electric signal measurement equipment respectively, 2 current measurement ends of current adjusting module connect the input end and the output terminal of electric signal measurement equipment, Voltage Regulator Module respectively, the electric current and voltage of current regulating module is regulated the output terminal of output termination electric signal measurement equipment.
As shown in Figure 2, the controller medium frequency is to be provided by external crystal-controlled oscillation, concrete crystal oscillator connects CPU and peripheral circuit, voltage regulator module connects the voltage signal rectifying and wave-filtering, the voltage signal rectifying and wave-filtering connects voltage frequency conversioning circuit, voltage frequency conversioning circuit connects CPU and peripheral circuit, current adjusting module connects the current signal rectifying and wave-filtering, the current signal rectifying and wave-filtering connects the power frequency change-over circuit, the power frequency change-over circuit connects CPU and peripheral circuit, CPU and peripheral circuit output voltage current controling signal.CPU and peripheral circuit output voltage current controling signal, its voltage control signal exports voltage regulator module to, current controling signal should export current adjusting module to.
The present invention is in specific implementation process, voltage regulator module, current adjusting module adopts four-end method respectively the combined-voltage current signal to be taken a sample, for guaranteeing that electric signal measurement equipment has higher reliability and precision, the voltage and current signal of sampling converted to be sent to controller behind the frequency signal and handle, voltage frequency conversioning circuit wherein, adopt the AD652 chip, voltage to frequency converter spare when it is the monolithic charge balance, the electric capacity that does not adopt high-quality low temperature to float constitutes monostable multi oscillation as basic timing circuit, and adopt external clock regularly, more stable, the linearity is better.Voltage regulator module adopts PWM ripple modulator approach, thereby controller reaches the size of regulation voltage output valve by the regulating impulse width.Current adjusting module comprises a plurality of precision resistances and relay, by the different compensation precision resistance value of controller signals output.
As shown in Figure 3, the current measuring range of supposing electric signal measurement equipment is during less than 800A, current regulating module can adopt the structure of Fig. 3 to regulate, the maximal regulated electric current is 15A, minimal adjustment is 0.1A, controller sends through overdrive circuit and searches the relay that controls signal to that compensation meter obtains, thus the resistance value in the different switch regulating loop of relay operation, thus change the electric current output of electric signal measurement equipment.The resistance of a plurality of similar resistance can be set under each Current Regulation value, can enlarge range of adjustment like this, in Fig. 3, have only 2 resistance.
As shown in Figure 4, when precision after the correction of electric signal measurement equipment surpasses 2 class requirements of original equipment, the by stages is not set then etc., only be provided with between super and following superzone, between last superzone with following superzone between absolute value be the same, promptly have only ± interval of two ratings, when at 0.1 times of U
Output, 0.1 times of I
OutputInterior regulating error value, if regulating the back error amount can drop in error range than high 2 grades of original equipment requires, then enter the calculating of Fig. 5, simultaneously by etc. the by stages compensation of tabling look-up, if can not drop in the error range requirement than high 2 grades of original equipment, then proceed error amount and regulate, error amount drops in the error range requirement of high 2 grades than original equipment after regulating.
As shown in Figure 5, the computation process of offset is as follows in the compensation meter: at first according to which interval of the error amount judgement that designs in advance in the five equilibrium homogenising, then according to the function that error delta is expressed as U output, I output, as δ=f (U output) * f (I output), regulate I output earlier, U output is regulated in the back, constitutes dual circulation and regulates, until obtaining the suitable modified value that matches with hardware, and offset is inserted between this compensating basin.Electric signal measurement equipment utilizes Fig. 5 to be compensated table in calibration or testing process, in the process of other equipment of actual measurement, directly take out the data that fixed in the compensation meter and compensate, if in strategic process equipment occur aging or situation that measuring error is bigger than normal under can take repeatedly Calibration Method.
Fig. 4 and Fig. 5 also can be regarded as, when precision surpasses 2 class requirements of original equipment after the correction of electric signal measurement equipment, error delta is expressed as the function of U output, I output, regulating error value in 0.1 times of U output, 0.1 times of I export, error amount drops in the error range requirement of high 2 grades than original equipment after regulating, the compensation of tabling look-up this moment, and this compensation meter is computation process foundation by Fig. 5 when dispatching from the factory.
Claims (5)
1. an electric signal measurement equipment precision guarantees control method, it is characterized in that step is:
The first step: monitoring control devices electric signal measurement equipment input voltage, current signal and output voltage, current signal, and the result is stored in a compensation meter of a nonvolatile memory;
Second step: utilize look-up method, a kind of dynamic compensation and computing method that improve the electric signal measurement equipment precision are provided;
The 3rd step: electric signal measurement equipment is regarded as a black box, its last voltage, current signal of exporting is compensated.
2. a kind of electric signal measurement equipment precision according to claim 1 guarantees control method, it is characterized in that: described compensation meter, according to the electric signal measurement equipment precision requirement, precision is in the requirement of high 2 grades than original equipment the time, the power power that all errors is divided at least 22 is interval uniformly, each interval is when equipment dispatches from the factory or detection, during calibration according to least square method regulate make error amount be predefined hour, be compensated the modified value in the table, when controller by after tabling look-up at the corresponding interval voltage of seeking, the modified value of electric current, the modified value of electric current is scaled the modified value of resistance again, by exporting control signal to voltage regulator module after the frequency inverted, current adjusting module, make offset and original value add reducing at last, to get the numerical value that requires to the end.
3. a kind of electric signal measurement equipment precision according to claim 1 guarantees control method, it is characterized in that: described compensation meter, the computation process of offset is at first according to which interval of the error amount judgement that designs in advance in the five equilibrium homogenising in the compensation meter, offset can be inserted between this compensating basin then, then according to the function that error delta is expressed as U output, I output, as δ=f (U output) * f (I output), regulate I output earlier, U output is regulated in the back, constitute dual circulation and regulate, until obtaining the suitable modified value that matches with hardware.
4. a kind of electric signal measurement equipment precision according to claim 1 guarantees control method, it is characterized in that: described compensation meter, when precision after the correction of electric signal measurement equipment surpasses 2 class requirements of original equipment, the by stages then is not set etc., only be provided with between super and following superzone, between last superzone with following superzone between absolute value be the same, promptly have only ± interval of two ratings, when when revising the back precision and be no more than 2 class requirements again by etc. the by stages compensate, when exporting at 0.1 times of U, regulating error value in 0.1 doubly I exports, if regulating the back error amount can drop in error range than high 2 grades of original equipment requires, then enter the calculating of offset, simultaneously by etc. the by stages compensation of tabling look-up, if can not drop in error range than high 2 grades of original equipment requires, then can not compensate.
5. a kind of electric signal measurement equipment precision according to claim 1 guarantees control method, it is characterized in that: described compensation meter, compensation meter has voltage, two offsets of electric current, at first electric current is revised, then just to the voltage correction, be first Control current adjusting module output resistance compensating signal, control voltage regulator module output voltage compensation signal then, arrive designing requirement in advance to guarantee the electric signal measurement equipment precision.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181598A (en) * | 2018-03-09 | 2018-06-19 | 温州伊诺韦特科技有限公司 | A kind of low-voltage generator calibration system |
| CN112067896A (en) * | 2020-09-08 | 2020-12-11 | 福建育巢信息科技有限公司 | Integrated intelligent tester for transformation ratio direct resistance on-load impedance |
| CN114895231A (en) * | 2022-07-12 | 2022-08-12 | 南京宏泰半导体科技有限公司 | High-end voltage differential sampling calibration system and method |
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| CN202145228U (en) * | 2011-06-21 | 2012-02-15 | 合肥国轩高科动力能源有限公司 | Acquisition apparatus of high speed and high precision for power cell of high voltage and intense current |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181598A (en) * | 2018-03-09 | 2018-06-19 | 温州伊诺韦特科技有限公司 | A kind of low-voltage generator calibration system |
| CN112067896A (en) * | 2020-09-08 | 2020-12-11 | 福建育巢信息科技有限公司 | Integrated intelligent tester for transformation ratio direct resistance on-load impedance |
| CN112067896B (en) * | 2020-09-08 | 2023-04-21 | 安康陕变智能电力装备制造有限公司 | Transformation ratio direct resistance on-load impedance integrated intelligent tester |
| CN114895231A (en) * | 2022-07-12 | 2022-08-12 | 南京宏泰半导体科技有限公司 | High-end voltage differential sampling calibration system and method |
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Application publication date: 20130724 |