CN110426552A - A method of current sample precision is improved by numerically controlled temperature-compensating - Google Patents
A method of current sample precision is improved by numerically controlled temperature-compensating Download PDFInfo
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- CN110426552A CN110426552A CN201910687918.0A CN201910687918A CN110426552A CN 110426552 A CN110426552 A CN 110426552A CN 201910687918 A CN201910687918 A CN 201910687918A CN 110426552 A CN110426552 A CN 110426552A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005070 sampling Methods 0.000 claims abstract description 35
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 230000003321 amplification Effects 0.000 claims abstract description 8
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 8
- 238000012544 monitoring process Methods 0.000 claims abstract description 3
- 238000012545 processing Methods 0.000 claims description 32
- 230000003750 conditioning effect Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000005619 thermoelectricity Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000000446 fuel Substances 0.000 claims description 2
- 230000005855 radiation Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
Abstract
The invention discloses a kind of methods for improving current sample precision by numerically controlled temperature-compensating, by obtaining real current Ireal in laboratory stage, current detection module institute output electric current measure Vh(is after ADC is converted into voltage output), the detected temperature Vntc(of temperature detecting module is after ADC is converted by voltage output) relational expression that is fitted according to experimental data between three, real-time monitoring current detection module exports detection electric current and environment temperature again, output electric current is adjusted and is calibrated, effectively improve the accuracy of true output current signal Ireal, improve the subsequent accuracy using electric current signal system module as input, greatly enhance the reliability of entire motor controller system, simultaneously because having coefficient amplification, sampling apparatus module area can be reduced.
Description
Technical field
The present invention relates to electronic circuit technologies, particularly relate to a kind of by numerically controlled temperature-compensating raising electricity
Flow the method for sampling precision.
Background technique
In electric machine controller, since the working environment of motor is more harsh, local environment temperature change is variable, and existing
The current sample mode such as modes such as resistance sampling, Hall current sensor and current transformer, the resistance value of resistance, sensor, mutually
The measurement accuracy of sensor will receive the influence of temperature, so that the accuracy of sampling is reduced, while the electric current of phase line is current-carrying capacity,
The temperature that can influence controller for electric vehicle in turn needs to sample phase current and calibrate output thus to realize more accurately
Control.
It is a kind of by numerically controlled temperature-compensating improve current sample precision method optimized to system architecture
While, the reliability of electric machine controller total system more can be improved, optimize area occupied by electric machine controller total system, fit
Trend that should be high in contemporary electric machine controller reliability requirement.
Summary of the invention
In order to overcome the shortcomings of that above-mentioned technology, the present invention provide one kind and adopt by numerically controlled temperature-compensating raising electric current
The method of sample precision, the method that temperature-compensating proposed in technical solution of the present invention improves current sample precision, it can
By obtaining real current Ireal, current detection module institute output electric current measure Vh(after ADC is converted in laboratory stage
By voltage output), temperature detecting module detect temperature Vntc(after ADC is converted as voltage output) between three according to experiment
The relational expression that data are fitted, then real-time monitoring current detection module export detection electric current and environment temperature, to output electricity
Stream is adjusted and calibrates, and effectively improves the accuracy of true output current signal Ireal, improves subsequent using current signal
The accuracy of system module as input greatly enhances the reliability of entire motor controller system, while because having coefficient
Amplification can reduce sampling apparatus module area.
The technical scheme adopted by the invention is as follows:
Current sampling device module, temperature acquisition apparatus module, current signal conditioning module, temperature signal regulation module, electric current
ADC module, temperature ADC module, digital processing module；
Wherein, the current sampling device module is used to collect exported electric current Imeasure,
The temperature acquisition apparatus module is used to collect environment temperature Temp,
Electric current, temperature signal regulation module are used for measurement by magnification electric current Imeasure, Temp signal,
Electric current, temperature ADC module are transferred to digital processing for the electric current being collected into, temperature signal to be converted to binary representation
Module,
Digital processing module is used to handle the data received,
Specifically, the electric current Imeasure that the acquisition of current sampling device module exports is improved as input and output to current signal
Module, temperature acquisition apparatus module collection environment temperature Temp give temperature signal regulation module, electric current, temperature as input and output
Signal conditioning module is using amplified electric current, temperature signal Imeasure_m, Temp_m as input and output to electric current, temperature
ADC module, electric current, temperature ADC module are using Vh, Vntc after conversion as input and output to digital processing module, digital processing
After module receives aforementioned modules input data, real current signal Ireal is exported
Wherein the modes such as resistance sampling, Hall current sensor and current transformer can be used to realize for current sampling device module,
Wherein resistance sampling generally uses low side sampling, high-end sampling, sampling resistor above load, and amplifier power ground is suspended in load
First-class mode is realized.
Temperature acquisition apparatus module detection mode includes expansion principle method, pressure and temp principle method, fuel factor method, thermoelectricity
The methods of principle method and heat radiation principle method are hindered, can be realized for modes such as thermistor, thermoelectricity occasionally temperature sampling chip.
Electric current, the effect of temperature signal regulation module are to amplify collected faint or lesser current signal, amplification factor
With specific implementation method depending on demand.
Electric current, temperature ADC module bit requirements view total system speed, required precision are determined.
MCU microprocessor module or ASIC special digital processing circuit module can be used in digital processing module, and inside it
Containing the relational expression Ireal=f (Vh, Vntc) being fitted between Ireal and Vh, Vntc or established tables of data, used
MCU model, performance and ASIC special digital processing circuit module clock frequency, circuit scale etc. are according to needed for total system
Reason speed, processing accuracy etc. are determined.
The beneficial effects of the present invention are: need to be sampled to phase current in electric machine controller to realize more accurate control
System.Existing current sample mode will receive the influence of temperature, make from the obtained data sampling precision of current sampling device module
It reduces, digital processing module is added thus, in advance to the electric current collected by laboratory testing current sampling device module
Imeasure(is indicated with Vh), temperature acquisition apparatus module collection to environment temperature Temp(indicated with Vntc) and practical electricity
The true phase current signal Ireal of machine carries out data fitting, establishes the relational expression or tables of data between three, digital processing module connects
After receiving Vh and Vntc signal, calculates or table look-up by formula, more accurate real current Ireal can be obtained.
This method gathers all data in laboratory stage simultaneously, has been fitted formula or has been stored in number after establishing tables of data
Word processing module has subtracted the module or device that actual phase current is detected in real electrical machinery controller, and because there is digital processing mould
Block can zoom in or out equation coefficients, and required electric current, temperature acquisition apparatus area can greatly reduce that (electric current, temperature are adopted
Sampling device is bigger, and institute's detection data can be bigger), the small-signal that need to only will test can be reduced to true by coefficient amplification
Value.
Detailed description of the invention
It is a kind of original of method that current sample precision is improved by numerically controlled temperature-compensating of the invention shown in Fig. 1
Reason figure.
Fig. 2 show signal relation exemplary diagram of the present invention.
Fig. 3 show signal relation sample table of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, the technical schemes of the invention are described in detail:
It is as shown in Figure 1 a kind of schematic diagram of method that current sample precision is improved by numerically controlled temperature-compensating, specifically
Include current sampling device module, temperature acquisition apparatus module, current signal conditioning module, temperature signal regulation module, electric current
ADC module, temperature ADC module, digital processing module；
The concrete operating principle of this example are as follows:
When initial, in laboratory stage, current sampling device module output current Imeasure, temperature acquisition apparatus module are measured
Aforementioned signal is carried out conditioning amplification through overcurrent, temperature signal regulation module and is sent into electric current, temperature by output environment temperature Temp
ADC module obtains the binary code represented by voltage Vh, Vntc to digital processing module, while measuring not by temperature shadow
The true phase current signal Ireal detected under the mode of sound, fits the relational expression between three:
Ireal=f(Vh,Vntc)
Signal relation exemplary diagram as shown in Figure 2 can be obtained, or directly establishes the tables of data between three, can be obtained as shown in Figure 3
Signal relation sample table.
Used current sampling device is Hall current inductive pick-up, and temperature acquisition apparatus is temperature sensor, finally
The data obtained fit correlation is as follows:
Ireal=A*Vh+B*Vntc
Wherein A, B are constant, i.e., in this case, it is linear relationships between Ireal, Vh, Vntc three.
If digital processing module is realized using MCU microprocessor module, core code (C language) are as follows:
int a=A;
int b=B;
int Ireal;int Vh;int Vntc;
int Function(int Vh,int Vntc,int a,int b)
{
return a*Vh+b*Vntc;
}
Ireal=Function(Vh,Vntc,a,b);
If digital processing module is realized using ASIC special digital processing circuit module, core code (Verilog) are as follows:
input [y-1 : 0] Vh,Vntc;
input [z-1 : 0] a,b;
output [x-1 : 0] Ireal;
always @ (posedge clk or negedge rst_n)
begin
if ( rst_n == 1’b0) begin
Ireal <=x’b0000…0000;
else begin
Ireal <=Vh*a+Vntc*b;
end
end
Wherein x, y, z represents parameters digit, and specific digit need to require to determine according to the required accuracy, and digit is closed between three
System should be matched with relational expression.This example can also optimize multiplier and adder simultaneously, call different multiplication, addition
Device.
In actual use, after digital processing module receives electric current, the output of temperature ADC module Vh, Vntc, at number
The relational expression or tables of data that reason inside modules fit in advance are calculated or are tabled look-up by algorithm, directly obtain true phase current
Ireal value.
Institute it should be noted that electric current, temperature acquisition apparatus itself precision the higher the better, precision is higher, digital processing module institute
The relational expression or tables of data of fitting are more accurate, adjust dynamics to the calibration of subsequent real current Ireal output valve and accuracy is got over
Greatly.
Approximating method used in digital processing module is unlimited, and storage result can be relational expression, can be tables of data, number
It need to be selected according to testing current precision according to bit wide.It need to be adopted simultaneously according to required precision and current sampling device module, temperature
Sampling device module accuracy data points influence, the digital processing element that internal storage space need to be selected to match.
If using the mode for establishing tables of data, no matter MCU, ASIC are realized, each entry value can be stored using memory in advance
Data recycle addressing of address mode to obtain desirable value, are illustrated in figure 3 signal relation sample table of the present invention.
It is understood that the present invention is not limited to the accurate configuration being illustrated above and components.Claims are not being departed from
Protection scope on the basis of, can be to method and structure above the step of sequence, details and operation make various modifications, change and
Optimization.
Claims (10)
1. a kind of method for improving current sample precision by numerically controlled temperature-compensating, it is characterised in that: this method passes through
Real current Ireal, current detection module institute output electric current measure Vh(are obtained after ADC is converted in laboratory stage as voltage
Output), the detected temperature Vntc(of temperature detecting module be voltage output after ADC is converted) between three according to experimental data institute
The relational expression of fitting, then real-time monitoring current detection module export detection electric current and environment temperature, carry out to output electric current
Adjustment and calibration, effectively improve the accuracy of true output current signal Ireal, improve subsequent use electric current signal system and make
For the accuracy of the module of input, the reliability of entire motor controller system is greatly enhanced, while because having coefficient amplification to make
With sampling apparatus module area can be reduced.
2. a kind of method for improving current sample precision by numerically controlled temperature-compensating according to claim 1, special
Sign is: including current sampling device module, temperature acquisition apparatus module, current signal conditioning module, temperature signal regulation mould
Block, electric current ADC module, temperature ADC module and digital processing module；
Wherein, the current sampling device module is used to collect exported electric current Imeasure,
The temperature acquisition apparatus module is used to collect environment temperature Temp,
Electric current, temperature signal regulation module are used for measurement by magnification electric current Imeasure, Temp signal,
Electric current, temperature ADC module are transferred to digital processing for the electric current being collected into, temperature signal to be converted to binary representation
Module,
Digital processing module is used to handle the data received,
Specifically, the electric current Imeasure that the acquisition of current sampling device module exports is improved as input and output to current signal
Module, temperature acquisition apparatus module collection environment temperature Temp give temperature signal regulation module, electric current, temperature as input and output
Signal conditioning module is using amplified electric current, temperature signal Imeasure_m, Temp_m as input and output to electric current, temperature
ADC module, electric current, temperature ADC module are using Vh, Vntc after conversion as input and output to digital processing module, digital processing
After module receives aforementioned modules input data, real current signal Ireal is exported.
3. a kind of method that current sample precision is improved by numerically controlled temperature-compensating according to claim 2,
Be characterized in that: current sampling device module uses the modes such as resistance sampling, Hall current sensor and current transformer to realize,
For middle resistance sampling using low side sampling, high-end sampling, sampling resistor above load, amplifier power ground is suspended in load upper type
It realizes.
4. a kind of method that current sample precision is improved by numerically controlled temperature-compensating according to claim 2,
Be characterized in that: temperature acquisition apparatus module detection mode includes expansion principle method, pressure and temp principle method, fuel factor method, heat
Resistance principle method and heat radiation principle method can be realized for modes such as thermistor, thermoelectricity occasionally temperature sampling chip.
5. a kind of method that current sample precision is improved by numerically controlled temperature-compensating according to claim 2,
Be characterized in that: the effect of current signal conditioning module is to amplify collected faint or lesser current signal, amplification factor and tool
Body implementation method is depending on demand.
6. a kind of method that current sample precision is improved by numerically controlled temperature-compensating according to claim 2,
Be characterized in that: the effect of temperature signal regulation module is to amplify collected faint or lesser temperature signal, amplification factor and tool
Body implementation method is depending on demand.
7. a kind of method that current sample precision is improved by numerically controlled temperature-compensating according to claim 2,
Be characterized in that: electric current, temperature ADC module bit requirements view total system speed, required precision are determined.
8. a kind of method that current sample precision is improved by numerically controlled temperature-compensating according to claim 2,
Be characterized in that: digital processing module uses MCU microprocessor module or ASIC special digital processing circuit module.
9. a kind of method that current sample precision is improved by numerically controlled temperature-compensating according to claim 2,
It is characterized in that: containing the relational expression Ireal=f (Vh, Vntc) being fitted between Ireal and Vh, Vntc inside digital processing module
Or established tables of data.
10. a kind of method that current sample precision is improved by numerically controlled temperature-compensating according to claim 2,
It is characterized in that: when digital processing module uses MCU microprocessor module or ASIC special digital processing circuit module.
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Cited By (4)
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| CN112730963A (en) * | 2020-12-22 | 2021-04-30 | 唐新颖 | Automobile-level Hall current sensor with temperature compensation and compensation method thereof |
| CN113156192A (en) * | 2021-02-26 | 2021-07-23 | 苏州优赛思电子科技有限公司 | Current sampling device of high-voltage system of new energy vehicle |
| CN114070163A (en) * | 2021-12-01 | 2022-02-18 | 深圳市优必选科技股份有限公司 | Motor control method, motor control device and motor control module |
| CN115236391A (en) * | 2020-06-03 | 2022-10-25 | 珠海多创科技有限公司 | Magnetic sensing chip and closed-loop feedback current sensor |
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