CN105446409B - Method for calibrating power supply and tuning power supply unit - Google Patents
Method for calibrating power supply and tuning power supply unit Download PDFInfo
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- CN105446409B CN105446409B CN201510734227.3A CN201510734227A CN105446409B CN 105446409 B CN105446409 B CN 105446409B CN 201510734227 A CN201510734227 A CN 201510734227A CN 105446409 B CN105446409 B CN 105446409B
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/563—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices including two stages of regulation at least one of which is output level responsive, e.g. coarse and fine regulation
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Abstract
The invention discloses a method for calibrating a power supply and tuning power supply unit. A calibrating system comprises the power supply and tuning power supply unit, a computer and a program-controlled multi-channel switch. The power supply and tuning power supply unit is internally provided with an AD voltage acquisition module, the two-stage digital-to-analogue conversion combination is utilized to adjust power output voltage, the voltage output range is adjusted by coarse tuning digital-to-analogue conversion, and the round-off error compensation is performed by fine tuning digital-to-analogue conversion. The voltage output is divided into a plurality of output ranges in the calibrating process, and the voltage output is calibrated respectively in each range. An array{Vi, N1i, N2i} of the voltage, the fine tuning digital-to-analogue conversion value N1 and the fine tuning digital-to-analogue conversion value N2 is obtained by calibrating a plurality of points, a curvilinear equation can be obtained by utilizing Chebyshev curve fitting, and the digital-to-analogue conversion value is calculated through the arrangement of the curvilinear equation.
Description
Technical field
The present invention relates to the calibration steps of field of power supplies, more particularly to a kind of power supply and tuning supply unit.
Background technology
Supply unit is mainly used in being powered equipment under test.In Aeronautics and Astronautics and high-speed digital communication industry, need
The supply unit of wide-range high-accuracy is wanted to be powered the tuning oscillating device such as VCO, YTO.It is defeated in measurement VCO, YTO agitator
When going out frequency, power, phase noise specifications, it is desirable to which supply module has higher voltage output range and output resolution ratio.
The power supply of traditional approach after DC-DC module conversion is changed DAC change output voltages by adjusting mould, is being set
When putting DAC value, DAC parameter values may be only accurate to integer, and the setting in the range of decimal will not be effective, can so lose fractional part
Point, cause to adjust the round-off error of voltage.On the other hand, for the voltage output of big dynamic range, such as from negative tens
Positive tens volt voltage output is lied prostrate, the nonuniformity of DAC also results in measurement error.This mode does not ensure that measurement essence
Degree, therefore for voltage indexes require that higher occasion can not meet requirement.
In order to improve the accuracy of output voltage, it is often necessary to which supply unit is calibrated.In calibration process, calibration cartridge
Putting needs the output voltage of the measuring instrument monitoring voltage device such as external voltage table or six half voltage meters.Calibration is divided into manually
Calibration and automatically calibration two ways.
When being calibrated by the way of craft, usually according to the scope of voltage output, two of voltage output are selected
End points, constantly regulate digital-to-analogue DAC value, until output voltage meets desired value.At this moment, the DAC value and electricity of two end points are recorded
Pressure value, output voltage calculate DAC value according to linear relationship and adjust voltage output so as to meet index request.
Calibrated by the way of craft, first, this mode can increase workload when calibration point is more.Secondly,
Actually it is not the strict linear relationship that meets between the DAC parameters of magnitude of voltage and reality, the calibration for carrying out in a linear fashion,
The accuracy requirement of voltage output can not be met.
Another kind of calibration steps is calibration automatically, i.e., led to by computer, supply unit, voltage measurement by the way of program control
Cable connection is crossed, this side alleviates workload relative to manual calibration, but on calibrator (-ter) unit, needed extra
Increase voltage measuring apparatus, in the case where being not powered on or device being closed, cannot just implement normal calibration.
Traditional method arranges digital-to-analogue conversion DAC and adjusts output supply voltage, and this method thinks that voltage output and DAC value are full
The certain linear relationship of foot, and actually due to voltage output scope and environment change, this linear relationship is tight
Lattice are set up.This method occasion higher for voltage output resolution can not meet accuracy requirement.
Output voltage is adjusted by the way of manual calibration, this mode workload is big, and calibration process easily malfunctions,
If when supply unit is produced in batches, manual calibration is wasted time and energy.
When output voltage being calibrated by DAC, generally require an external voltage measuring apparatus, such as circuit tester or six
Half voltage meter.This mode can additionally increase measuring instrument in calibration, increased cost, and during external device measurement voltage,
Due to the partial pressure of external device, cause measurement voltage inaccurate, directly affect the accuracy of calibration.
The content of the invention
To solve above-mentioned the deficiencies in the prior art, the present invention proposes a kind of power supply and tunes the calibration side of supply unit
Method.
The technical scheme is that what is be achieved in that：
A kind of power supply and the calibration steps of tuning supply unit, calibration system include powering and tuning supply unit, calculate
Machine, program control variable connector, in the built-in AD voltage acquisition modules of supply unit, combine regulation power supply using two-stage digital-to-analogue conversion DAC
Output voltage, adjusts voltage output range by coarse adjustment DAC, carries out round-off error compensation by accurate adjustment DAC；
Voltage output is divided into into multiple output areas in calibration process, is calibrated in each scope respectively；By school
Accurate multiple points obtain the array { Vi, N1i, N2i } of voltage, coarse adjustment DAC value N1, accurate adjustment DAC value N2, are intended using Chebyshev's curve
Close, a curvilinear equation can be obtained, arranged by curvilinear equation and calculate DAC value.
Alternatively, in curve fitting process, single-point acquiring is adjusted using the combination of two-stage DAC, and two-stage DAC is respectively adopted one
Individual coarse adjustment DAC and an accurate adjustment DAC combination；Coarse adjustment DAC is in leading position, and accurate adjustment DAC is to thick on the basis of coarse adjustment DAC
The round-off error of DAC is adjusted to compensate.
Alternatively, coarse adjustment DAC calculation process is specific as follows：
Step (11), it is desirable to which the voltage parameter of output is V, calibrates coarse adjustment DAC first, first fixes accurate adjustment before calibration
DAC value is designated as fixed value ExactN；
Step (12), if coarse adjustment DAC calibration voltages are respectively V1 school, coarse adjustment DAC is adjusted during calibration, when output voltage about etc.
In V1 schoolWhen, write down DAC value CoarN1 and corresponding actual voltage value CoarV1；
Step (13), if coarse adjustment DAC calibration voltages are respectively V2 schools, coarse adjustment DAC is adjusted during calibration, when output voltage about etc.
In V2 schoolsWhen, write down DAC value CoarN2 and corresponding actual voltage value CoarV2；
Step (14), it is N1 to calculate coarse adjustment DAC value according to the linear relationship of CoarV1, CoarV2, CoarN1, CoarN2,
N1=(V-CoarV1) * (CoarN2-CoarN1) * (CoarV2-CoarV1)+CoarN1.
Alternatively, accurate adjustment DAC calculation process is specific as follows：
Step (21), first fixes coarse adjustment DAC value before calibration and is designated as fixed value CoarN；
Step (22), puts accurate adjustment ExactN for a fixed value, on the basis of ExactN, difference downward shift constant offset
Value offsetN, note (ExactN-offsetN) is ExacN1, and corresponding voltage is designated as ExacV1；
Step (23), is (ExactN+offsetN) ExacN2, and corresponding voltage is designated as ExacV2, calculates accurate adjustment DAC
Sensitivity coefficient S, wherein, S=(ExacV2-ExacV1)/(ExacN2-ExacN1), unit be (V/bit)；
Step (24), giving needs magnitude of voltage the Δ V and S of compensation, calculates the variable quantity of accurate adjustment DAC, accurate adjustment DAC end values
For N2=ExactN+ Δ V/S.
Alternatively, the coarse adjustment DAC is 16.
Alternatively, the accurate adjustment DAC is 12.
The invention has the beneficial effects as follows：
(1) traditional method arranges digital-to-analogue conversion DAC and adjusts output supply voltage, and this method thinks voltage output and DAC
Value meets certain linear relationship, and actually due to voltage output scope and environment change, this linear relationship is simultaneously
Strictly do not set up.This method occasion higher for voltage output resolution can not meet accuracy requirement, and the present invention is adopted
Coarse adjustment and accurate adjustment two-stage digital-to-analogue conversion DAC, coarse adjustment DAC are in leading position, and output voltage is mainly generated by it, and accurate adjustment DAC is
The round-off error of coarse adjustment DAC is compensated on the basis of coarse adjustment DAC, improve output voltage by this method accurate
Degree.
(2) output voltage is adjusted by the way of manual calibration, this mode workload is big, and calibration process easily goes out
Mistake, if when supply unit is produced in batches, manual calibration is wasted time and energy.The present invention makes instrument by the way of program control
Automatically calibrate, improve work efficiency, meet the requirement of large-scale mass production.
(3) an external voltage measuring apparatus are generally required when output voltage is calibrated by DAC, such as circuit tester or
Six half voltage meters.This mode can additionally increase measuring instrument in calibration, increased cost, and external device measurement voltage
When, due to the partial pressure of external device, cause measurement voltage inaccurate, directly affect the accuracy of calibration.The present invention is using built-in
High-precision AD collection, calculate voltage, due to Hall effect, be not result in voltage, the voltage accuracy of collection is high.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the calibration system of the present invention；
Fig. 2 is the structural representation of the supply unit of the present invention；
Fig. 3 is the coarse adjustment DAC calculation flow charts of the present invention；
Fig. 4 is the accurate adjustment DAC calculation flow charts of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The accuracy of power supply and VT output is an important indicator of power supply, will directly affect measured device output
Frequency, can improve voltage output accuracy by calibration.It is manually, that is, to lead to the calibration of voltage in traditional method
The magnitude of voltage for choosing two end points in a voltage range is crossed, by manual constantly adjustment digital-to-analogue conversion DAC value, a certain scope is made
Output voltage values meet required precision.If the voltage output range of system is wider, two ends exported by calibration voltage
Point, non-linear due to output voltage can cause voltage output to be unsatisfactory for requiring, if voltage range is divided into multistage, will
Increase calibration points, this method can increase huge workload under batch calibration condition.
For these reasons, the present invention is automatically performed calibration process by calibration procedure by the way of program control.Such as Fig. 1 institutes
Show, the calibration system of the present invention includes powering and tuning supply unit, computer, program control variable connector, supply unit and calculating
Spi bus interface between machine using standard is communicated, in the built-in AD voltage acquisition modules of supply unit, as Hall is imitated
Should, AD voltage acquisition modules will not partial pressure, improve the accuracy of voltage acquisition, at the same this scheme need not increase other add
Equipment, just can be calibrated to multiple stage supply unit automatically.
Supply unit major function is to provide power supply for the tuning agitator such as outside measured device, such as VCO, YTO and adjust
Humorous power supply.For high-precision agitator testing requirement, it is desirable to which power supply should meet relatively low phase noise and very high output
Resolution, the theory diagram of supply unit of the present invention is as shown in Fig. 2 using two-stage digital-to-analogue conversion DAC combination regulation power supply outputs
The method for designing of voltage, adjusts voltage output range by coarse adjustment DAC, carries out round-off error compensation by accurate adjustment DAC, by thick
DAC and accurate adjustment DAC combinations are adjusted to make final output voltage meet high-precision requirement.
Power supply output is divided into two-stage, and respectively supply voltage output and VT is exported.Input power Jing inductance and electricity
DC-DC power source conversion module is supplied to after capacitor filter, power supply can be effective after the filter circuit of big inductance value and big capacitance
Suppress near-end differential mode noise.DC-DC power source conversion module used will can be isolated between input and output, can be effective
The noise of input power ground is avoided to be delivered to back-end circuit.Using coarse adjustment analog digital conversion DAC and accurate adjustment modulus of two-layer configuration
The digital-to-analogue conversion of conversion DAC, can effectively improve the resolution of out-put supply.Filtering part is driven to employ common mode and differential mode group
The noise suppression circuit of conjunction can further reduce output noise.
In order to improve the accuracy of voltage output, need to calibrate supply unit, record defeated by the value for adjusting DAC
Go out voltage, the value of DAC is finally set according to the relation of DAC value and output voltage, required voltage is obtained.Traditional method is in calibration
During need the measuring instruments such as the device of external measurement voltage, such as circuit tester or 6 half, this mode is due to outside device
Part partial pressure causes voltage measurement inaccurate.The present invention is calibrated for convenience, the built-in AD voltage acquisition modules of supply unit, the mould
Before block is built in voltage output, can be with the output voltage of synchronous acquisition supply unit, due to Hall effect, supply voltage will not
Partial pressure, it is to avoid the loss of voltage, improves certainty of measurement.
Based on above-mentioned calibration system, in order to meet the requirement of Larger Dynamic range of voltages output, in the calibration process of the present invention
Voltage output is divided into into multiple output areas, is calibrated in each scope respectively.
Non-thread between Chebyshev (Chebyshev) curve fitting algorithm modifying factor voltage and DAC parameters is adopted in calibration
Property and caused error.
In addition, in curve fitting process, in order that line smoothing, need to ensure that collection point is correct.Single-point acquiring adopts two
The method for designing that level DAC combinations are adjusted, two-stage DAC are respectively adopted one 16 coarse adjustment DAC and 12 accurate adjustment DAC combinations and produce
It is raw.Coarse adjustment DAC is in leading position, and output voltage is mainly adjusted by which, and accurate adjustment DAC is to coarse adjustment on the basis of coarse adjustment DAC
The round-off error of DAC is compensated, be used in mixed way by coarse adjustment DAC and accurate adjustment DAC make final output voltage both met voltage move
State scope meets high-precision requirement greatly again.
It is assumed that wherein one section of voltage output range is-Vmin arrives Vmax, each voltage output voltage passes through coarse adjustment DAC
Calculate and accurate adjustment DAC calculation process, obtain that coarse adjustment DAC value is designated as N1 and accurate adjustment DAC value is designated as the data of N2, so obtain one group
{Vi, N1i, N2iCalibration point data, then by curve matching, one group of curvilinear equation is obtained, voltage is arranged by curvilinear equation
Output parameter.
As shown in figure 3, coarse adjustment DAC calculation process is specific as follows：
Step (11), it is assumed that require that the voltage parameter for exporting is V, calibrate coarse adjustment DAC first, first fixes essence before calibration
DAC value is adjusted to be designated as fixed value ExaetN.
Step (12), if coarse adjustment DAC calibration voltages are respectively V1 school, DAC is adjusted during calibration, when output voltage is approximately equal to (by mistake
Difference scope is ± 0.5V) V1 schoolWhen, write down DAC value CoarN1 and corresponding actual voltage value CoarV1.
Step (13), if coarse adjustment DAC calibration voltages are respectively V2 schools, DAC is adjusted during calibration, when output voltage is approximately equal to (by mistake
Difference scope is ± 0.5V) V2 schoolsWhen, write down DAC value CoarN2 and corresponding actual voltage value CoarV2.
Step (14), it is N1 to calculate coarse adjustment DAC value according to the linear relationship of CoarV1, CoarV2, CoarN1, CoarN2,
N1=(V-CoarV1) * (CoarN2-CoarN1) * (CoarV2-CoarV1)+CoarN1.
The present invention uses virtual voltage CoarV1 and CoarV2, and does not use V1 schoolAnd V2 schoolsCalculated, can so be removed
The introduced slight error of DAC resolution.
As shown in figure 4, accurate adjustment DAC calculation process is specific as follows：
When coarse adjustment DAC value is calculated, calculated N1 values, when being configured, may be only accurate to integer to said process,
The loss of decimal Δ N is just caused so, in order to decimal Δ N compensating for loss and damage, compensate to which using accurate adjustment DAC.
Step (21), first fixes coarse adjustment DAC value before calibration and is designated as fixed value CoarN.
Step (22), puts accurate adjustment ExactN for a fixed value, on the basis of ExactN, difference downward shift constant offset
Value offsetN (such as 1000), note (ExactN-offsetN) is ExacN1, and corresponding voltage is designated as ExacV1.
Step (23), is (ExactN+offsetN) ExacN2, and corresponding voltage is designated as ExacV2, can meter according to them
Calculate the sensitivity coefficient S of accurate adjustment DAC.
Wherein, S=(ExacV2-ExacV1)/(ExacN2-ExacN1), unit are (V/bit).
Step (24), giving needs magnitude of voltage the Δ V and S of compensation, you can calculate the variable quantity of accurate adjustment DAC, accurate adjustment DAC is most
Final value is N2=ExactN+ Δ V/S.
By the calculating process of above-mentioned coarse adjustment DAC and accurate adjustment DAC, can obtain single point voltage and digital-to-analogue conversion DAC value it
Between relation, the benefit of this method is to adjust to compensate round-off error by coarse adjustment and accurate adjustment DAC, improves voltage output accurate
Exactness.The array { Vi, N1i, N2i } of voltage, coarse adjustment DAC value N1, accurate adjustment DAC value N2 is obtained by calibrating multiple points, is adopted and is cut
Than avenging husband's curve matching, a curvilinear equation can be obtained, be arranged by curvilinear equation and calculate DAC value, by curve matching side
Formula reduces nonlinearity erron.
By the way of coarse adjustment DAC and accurate adjustment DAC combinations, coarse adjustment DAC ensures the output of voltage to the calibration steps of the present invention
Scope, voltage output range are greatly expanded, and accurate adjustment DAC ensures the precision of output voltage.Calibration parameter passes through Chebyshev's curve
The mode of fitting, overcomes the nonlinearity erron of conventional linear method.
And, the present invention is overcome the big problem of manual calibration workload, is made program using the method for PROGRAMMED AUTO-CALIBRATION
Automatically calibrate, while the calibration point methods of the Approach by inchmeal of present invention offer, substantially increase work efficiency.
The present invention additionally uses built-in AD analog-digital converters Sampling techniques, can be with real-time detection voltage output value, by Hall
Effect, does not result in the loss of voltage, improves voltage calibration precision.Without the need for external voltage measuring apparatus, you can realize that power supply is defeated
Go out the automatic calibration of device, save hardware cost.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (4)
1. it is a kind of power supply and tune supply unit calibration steps, it is characterised in that calibration system includes powering and tunes power supply
Device, computer, program control variable connector, in the built-in AD voltage acquisition modules of supply unit, are combined using two-stage digital-to-analogue conversion DAC
Regulation power supply output voltage, adjusts voltage output range by coarse adjustment DAC, carries out round-off error compensation by accurate adjustment DAC；
Voltage output is divided into into multiple output areas in calibration process, is calibrated in each scope respectively；It is many by calibrating
Individual point obtains the array { Vi, N1i, N2i } of voltage, coarse adjustment DAC value N1, accurate adjustment DAC value N2, using Chebyshev's curve matching,
A curvilinear equation can be obtained, is arranged by curvilinear equation and is calculated DAC value；
In curve fitting process, single-point acquiring using two-stage DAC combination adjust, two-stage DAC be respectively adopted a coarse adjustment DAC and
One accurate adjustment DAC combination；Coarse adjustment DAC is in leading position, and accurate adjustment DAC is the rounding-off on the basis of coarse adjustment DAC to coarse adjustment DAC
Error is compensated；
Coarse adjustment DAC calculation process is specific as follows：
Step (11), it is desirable to which the voltage parameter of output is V, calibrates coarse adjustment DAC first, first fixes accurate adjustment DAC value before calibration
It is designated as fixed value ExactN；
Step (12), if coarse adjustment DAC calibration voltages are respectively V1 school, coarse adjustment DAC is adjusted during calibration, when output voltage is approximately equal to V1 school
When, write down DAC value CoarN1 and corresponding actual voltage value CoarV1；
Step (13), if coarse adjustment DAC calibration voltages are respectively V2 schools, coarse adjustment DAC is adjusted during calibration, when output voltage is approximately equal to V2 schools
When, write down DAC value CoarN2 and corresponding actual voltage value CoarV2；
Step (14), it is N1, N1=to calculate coarse adjustment DAC value according to the linear relationship of CoarV1, CoarV2, CoarN1, CoarN2
(V-CoarV1)*(CoarN2-CoarN1)*(CoarV2-CoarV1)+CoarN1。
2. a kind of power supply as claimed in claim 1 and the calibration steps of supply unit is tuned, it is characterised in that accurate adjustment DAC is counted
Calculate flow process specific as follows：
Step (21), first fixes coarse adjustment DAC value before calibration and is designated as fixed value CoarN；
Step (22), puts accurate adjustment ExactN for a fixed value, on the basis of ExactN, difference downward shift fixed offset value
OffsetN, note (ExactN-offsetN) is ExacN1, and corresponding voltage is designated as ExacV1；
Step (23), is (ExactN+offsetN) ExacN2, and corresponding voltage is designated as ExacV2, calculates the spirit of accurate adjustment DAC
Sensitivity coefficient S, wherein, S=(ExacV2-ExacV1)/(ExacN2-ExacN1), unit are (V/bit)；
Step (24), giving needs magnitude of voltage the Δ V and S of compensation, calculates the variable quantity of accurate adjustment DAC, and accurate adjustment DAC end values are N2
=ExactN+ Δ V/S.
3. a kind of power supply as claimed in claim 1 and the calibration steps of supply unit is tuned, it is characterised in that the coarse adjustment
DAC is 16.
4. a kind of power supply as claimed in claim 1 and the calibration steps of supply unit is tuned, it is characterised in that the accurate adjustment
DAC is 12.
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| CN107121656A (en) * | 2017-04-28 | 2017-09-01 | 茂硕电源科技股份有限公司 | A kind of power supply automatic calibrating method and device |
| CN108627190B (en) * | 2017-07-28 | 2023-12-19 | 杭州思泰微电子有限公司 | High-precision magnetic sensor correction structure and correction method based on integrated circuit |
| CN110243486B (en) * | 2019-07-04 | 2021-01-08 | 上海申矽凌微电子科技有限公司 | Full-temperature high-precision temperature sensing system, method and medium |
| GB2591297B (en) * | 2020-01-27 | 2022-06-08 | Thermo Fisher Scient Bremen Gmbh | Voltage supply |
| CN112327725A (en) * | 2020-11-30 | 2021-02-05 | 北京航天长征飞行器研究所 | Self-adaptive dynamic adjustment system for power output |
| CN112636701B (en) * | 2020-12-03 | 2024-10-15 | 江苏科大亨芯半导体技术有限公司 | Power amplifier calibration method |
| CN118465624B (en) * | 2024-07-09 | 2024-09-27 | 国营洛阳丹城无线电厂 | Detection platform and detection method of multifunctional frequency synthesizer |
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| CN103576734A (en) * | 2013-10-21 | 2014-02-12 | 电子科技大学 | Dual-ring control self-adapting voltage adjusting method and device |
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