CN106950524A - Calibration method, device and calibration system for voltage measuring apparatus - Google Patents
Calibration method, device and calibration system for voltage measuring apparatus Download PDFInfo
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- CN106950524A CN106950524A CN201710096730.XA CN201710096730A CN106950524A CN 106950524 A CN106950524 A CN 106950524A CN 201710096730 A CN201710096730 A CN 201710096730A CN 106950524 A CN106950524 A CN 106950524A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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Abstract
The invention discloses a kind of calibration method, device and calibration system for voltage measuring apparatus, the voltage measuring apparatus includes voltage sampling circuit and processor, voltage sampling circuit is used to carry out voltage sample to the power supply of input, the sampled output of voltage sampling circuit and the analog-to-digital conversion port of processor are connected, the digital quantity that processor is provided according to analog-to-digital conversion port calculates the sample voltage value for obtaining corresponding power, and the calibration method includes：The first reference power source is inputted to voltage sampling circuit；Control process device calculates the sample voltage value for obtaining the first reference power source of correspondence as the first sample voltage value；The second reference power source is inputted to voltage sampling circuit；Control process device calculates the sample voltage value for obtaining the second reference power source of correspondence as the second sample voltage value；The downsampling factor for the measurement magnitude of voltage for obtaining being converted to any sample voltage value corresponding power is calculated according to the actual voltage value of the first and second sample voltage values and the first and second reference power sources.
Description
Technical field
The present invention relates to voltage measurement technologies field, more particularly it relates to a kind of for voltage measuring apparatus
Calibration method, a kind of calibrating installation and a kind of calibration system for voltage measuring apparatus.
Background technology
As shown in figure 1, voltage measuring apparatus includes voltage sampling circuit and processor U1, the voltage sampling circuit includes dividing
Piezoresistance R1 and divider resistance R2, and divider resistance R1 and divider resistance R2 are connected in series in the power input of voltage sampling circuit
Hold between J0 and earth terminal, the potential point between divider resistance R1 and divider resistance R2 is exported as the sampling of voltage sampling circuit
Hold and be connected with processor U1 analog-to-digital conversion (referred to as ADC) port P1, be i.e. processor U1 is integrated with analog-to-digital conversion module, this
Sample, the digital quantity that processor U1 just can be provided according to analog-to-digital conversion module calculates the voltage V for obtaining sampled outputADC, go forward side by side
And the measurement voltage V0 obtained via the power input J0 power supplys inputted is calculated, wherein：
V0=K × VADCFormula (2)；
R1 is divider resistance R1 Theoretical Design resistance, and R2 is divider resistance R2 Theoretical Design resistance, and K is voltage sample
The downsampling factor of circuit, DnFor analog-to-digital conversion module conversion voltage VADCObtained binary numeral, VrefFor analog-to-digital conversion module
Internal reference voltage.
Understood according to formula (1) to formula (3), measurement voltage V0 measurement accuracy and divider resistance R1, R2 resistance essence
Degree is related to the sampling error of analog-to-digital conversion module.Under normal conditions, the measurement error of voltage measuring apparatus is 20mV or so,
And the sampling error of analog-to-digital conversion module is typically smaller than 0.8mV, the measurement error of its relative voltage measuring device can be ignored not
Meter, therefore, measurement accuracy will primarily depend upon divider resistance R1, R2 resistance precision.
At present, the precision of resistance is broadly divided into 5%, 1%, 0.5%, 0.1% several grades, and the resistance of different accuracy institute
Corresponding price exponentially type can increase, so the simple measurement accuracy for ensureing tension measuring circuit by improving resistance precision
Huge cost pressure can be faced for batch production.Therefore, tension measuring circuit can be improved by being highly desirable to offer one kind
Measurement accuracy calibration program.
The content of the invention
One purpose of the embodiment of the present invention is to provide a kind of new technical scheme for calibration voltage measuring circuit.
According to the first aspect of the invention there is provided a kind of calibration method for voltage measuring apparatus, the voltage is surveyed
Measuring device includes voltage sampling circuit and processor, and the voltage sampling circuit is used to carry out voltage sample to the power supply of input,
The sampled output of the voltage sampling circuit is connected with the analog-to-digital conversion port of the processor, and the processor is according to described
The digital quantity that analog-to-digital conversion port is provided calculates the sample voltage value for obtaining the correspondence power supply, and the calibration method is included sequentially
The following steps of execution：
The first reference power source is inputted to the voltage sampling circuit；
The processor is controlled to calculate the sample voltage value for obtaining correspondence first reference power source as the first sampling electricity
Pressure value；
The second reference power source is inputted to the voltage sampling circuit；
The processor is controlled to calculate the sample voltage value for obtaining correspondence second reference power source as the second sampling electricity
Pressure value；
According to first sample voltage value, second sample voltage value, first reference power source virtual voltage
The actual voltage value of value and second reference power source calculates the measurement voltage that any sample voltage value is converted to corresponding power
The downsampling factor of value.
According to the second aspect of the invention there is provided a kind of calibrating installation for voltage measuring apparatus, the voltage is surveyed
Measuring device includes voltage sampling circuit and processor, and the voltage sampling circuit is used to carry out voltage sample to the power supply of input,
The sampled output of the voltage sampling circuit is connected with the analog-to-digital conversion port of the processor, and the processor is according to described
The digital quantity that analog-to-digital conversion port is provided calculates the sample voltage value for obtaining the correspondence power supply, and the calibrating installation includes：
Connector is calibrated, the calibration connector is arranged to be used for connecting the power input of the voltage sampling circuit
End；
First controlling switch；
First reference power source, first reference power source connects via first controlling switch with the calibration connector
Connect；
Second controlling switch；
Second reference power source, second reference power source connects via second controlling switch with the calibration connector
Connect；And,
Controller, the controller be arranged to be used for controlling the processor timesharing complete first reference power source and
The voltage sample of second reference power source is calculated, to pass through the reality of first reference power source and second reference power source
Magnitude of voltage and the sampled voltage of first reference power source and second reference power source is corresponded to respectively be worth to any sampling
Magnitude of voltage is converted to the downsampling factor of the measurement magnitude of voltage of corresponding power.
Optionally, the control implement body is arranged to be used for：
According to the first feedback signal for having closed the first controlling switch and the second controlling switch of disconnection, to the processor
Send the first calibration signal；
Receive adopting for correspondence first reference power source that the processor is obtained according to first calibration signal calculating
Sample magnitude of voltage is used as the first sample voltage value；
After first sample voltage value is received, controlled according to having closed the second controlling switch and having disconnected first
Second feedback signal of switch, the second calibration signal is sent to the processor；
Receive adopting for correspondence second reference power source that the processor is obtained according to second calibration signal calculating
Sample magnitude of voltage is used as the second sample voltage value；
According to first sample voltage value, second sample voltage value, first reference power source virtual voltage
The actual voltage value of value and second reference power source calculates the downsampling factor；
The downsampling factor is write in the processor in memory.
Optionally, the calibrating installation also includes the human-computer interaction device being connected with the controller.
Optionally, the controller is also configured to be used to automatically control first controlling switch and second control
Make the on off state of switch.
Optionally, first controlling switch is that one of the analog switch chip for being controlled by controller switch is logical
Road, second controlling switch is another switching channels of the analog switch chip.
Optionally, the control implement body is arranged to be used for：
Control the first controlling switch close and control the second controlling switch disconnect, it is rear to the processor send first
Calibration signal, so that the processor calculates the sampling for obtaining correspondence first reference power source according to first calibration signal
Magnitude of voltage is used as the first sample voltage value；
Receive the first completion signal that the processor is returned after calculating obtains first sample voltage value；
Signal is completed according to described first to control second controlling switch to close and control first controlling switch to break
Open, it is rear to the processor send the second calibration signal so that the processor is calculated according to second calibration signal
Sample voltage value to correspondence second reference power source is used as the second sample voltage value；
Receive the second completion signal that the processor is returned after calculating obtains second sample voltage value；And,
Signal is completed according to described second, and actual voltage value and institute with first reference power source are exported to processor
The revise signal of the actual voltage value of the second reference power source is stated, so that the processor is after the revise signal is received, root
According to first sample voltage value, second sample voltage value, the actual voltage value of first reference power source and described
The actual voltage value of two reference power sources calculates and stores the downsampling factor.
According to the third aspect of the invention we there is provided a kind of calibration system, it includes voltage measuring apparatus and calibrating installation,
The voltage measuring apparatus includes voltage sampling circuit and processor, and the voltage sampling circuit is used to carry out the power supply of input
Voltage sample, the sampled output of the voltage sampling circuit is connected with the analog-to-digital conversion port of the processor, the processing
The digital quantity that device is provided according to the analog-to-digital conversion port calculates the sample voltage value for obtaining the correspondence power supply；
The calibrating installation includes：
First controlling switch；
First reference power source, first reference power source is via first controlling switch and the voltage sampling circuit
Power input is connected；
Second controlling switch；
Second reference power source, second reference power source is via second controlling switch and the voltage sampling circuit
Power input is connected；And,
Controller, the controller be arranged to be used for controlling the processor timesharing complete first reference power source and
The voltage sample of second reference power source is calculated, to pass through the reality of first reference power source and second reference power source
Magnitude of voltage and the sampled voltage of first reference power source and second reference power source is corresponded to respectively be worth to any sampling
Magnitude of voltage is converted to the downsampling factor of the measurement magnitude of voltage of corresponding power.
Optionally, the controller is anti-according to closed the first controlling switch and the second controlling switch of disconnection first
Feedback signal, the first calibration signal is sent to the processor；
The processor calculates the sampled voltage for obtaining correspondence first reference power source according to first calibration signal
Value exports first sample voltage value to the controller as the first sample voltage value；
The controller is after first sample voltage value is received, according to having closed the second controlling switch and disconnected
The second feedback signal of the first controlling switch is opened, the second calibration signal is sent to the processor；
The processor calculates the sampled voltage for obtaining correspondence second reference power source according to second calibration signal
Value exports second sample voltage value to the controller as the second sample voltage value；
The controller is according to first sample voltage value, second sample voltage value, first reference power source
Actual voltage value and the actual voltage value of second reference power source calculate the downsampling factor；
The controller writes the downsampling factor in the memory of the processor.
Optionally, the controller controls the first controlling switch closure and controls second controlling switch to break
Open, it is rear to the processor send the first calibration signal；
The processor calculates the sampled voltage for obtaining correspondence first reference power source according to first calibration signal
Value returns to the first completion signal as the first sample voltage value, and to the controller；
The controller completes signal according to described first and controls second controlling switch to close and control described first
Controlling switch disconnect, it is rear to the processor send the second calibration signal；
The processor calculates the sampled voltage for obtaining correspondence second reference power source according to second calibration signal
Value returns to the second completion signal as the second sample voltage value, and to the controller；
The controller completes signal to processor output revise signal according to described second, and the revise signal includes institute
State the actual voltage value of the first reference power source and the actual voltage value of second reference power source；
The processor is adopted after the revise signal is received according to first sample voltage value, described second
The actual voltage value of sample magnitude of voltage, the actual voltage value of first reference power source and second reference power source is calculated and stored
The downsampling factor.
The beneficial effect of the present invention is that calibration method of the present invention, calibrating installation and calibration system are surveyed by voltage
Amount measurement device obtains the sample voltage value of two reference power sources of correspondence, and according to the sample voltage value of two reference power sources of correspondence
The measurement magnitude of voltage for obtaining being converted to any sample voltage value corresponding power is calculated with the actual voltage value of two reference power sources
Downsampling factor, so, just substituted using the downsampling factor and obtained sampling calculated according to the Theoretical Design value of divider resistance
Coefficient, and then the calibration of downsampling factor is realized, after calibration is complete, the sampling that processor just can be obtained directly using calibration
Coefficient calculates the measurement voltage of tested power supply, realizes the purpose for the measurement accuracy for improving voltage measuring apparatus.
By referring to the drawings to the detailed description of the exemplary embodiment of the present invention, further feature of the invention and its
Advantage will be made apparent from.
Brief description of the drawings
The accompanying drawing for being combined in the description and constituting a part for specification shows embodiments of the invention, and even
It is used for the principle for explaining the present invention together with its explanation.
Fig. 1 is the electrical block diagram of voltage measuring apparatus；
Fig. 2 is a kind of schematic flow sheet of embodiment according to calibration method of the present invention；
Fig. 3 is the electrical block diagram according to calibrating installation of the present invention and a kind of embodiment of calibration system；
Fig. 4 is the schematic flow sheet that step is performed according to a kind of controller of embodiment of calibration method of the present invention；
Fig. 5 is the schematic flow sheet that step is performed according to the controller of another embodiment of calibration method of the present invention.
Embodiment
The various exemplary embodiments of the present invention are described in detail now with reference to accompanying drawing.It should be noted that：Unless had in addition
Body illustrates that the part and the positioned opposite of step, numerical expression and numerical value otherwise illustrated in these embodiments does not limit this
The scope of invention.
The description only actually at least one exemplary embodiment is illustrative below, never as to the present invention
And its any limitation applied or used.
It may be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable
In the case of, the technology, method and apparatus should be considered as a part for specification.
In shown here and discussion all examples, any occurrence should be construed as merely exemplary, without
It is as limitation.Therefore, other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined, then it need not be further discussed in subsequent accompanying drawing in individual accompanying drawing.
Fig. 2 is a kind of schematic flow sheet of embodiment according to calibration method of the present invention.
According to Fig. 2, calibration method of the invention may include steps of：
Step S210, first is inputted by the power input J0 of the voltage sampling circuit in Fig. 1 to voltage sampling circuit
Reference power source, performs following steps S220 afterwards.
First reference power source is the basicly stable power supply of actual voltage value, for example, the first reference power source is to stablize shape
Output ripple is less than 1mV stabilized power source under state.
First reference power source can be the low pressure difference linear voltage regulator (low of product in itself where voltage measuring apparatus
Dropout regulator, referred to as LDO) output accurate power supply；It can also be the power supply that external device (ED) is provided.
Processor U1, which is calculated, in step S220, control figure 1 obtains the sample voltage value of the first reference power source of correspondence and is used as the
One sample voltage value, performs following steps S230 afterwards.
First sample voltage value is to be inputted to voltage sampling circuit after the first reference power source, passes through voltage sampling circuit
Sampled output output voltage measured value.Specifically, processor U1 is calculated according to above-mentioned formula (1) obtains correspondence first
The sample voltage value of reference power source.
Step S230, second is inputted by the power input J0 of the voltage sampling circuit in Fig. 1 to voltage sampling circuit
Reference power source, performs following steps S240 afterwards.
Second reference power source is similarly the basicly stable power supply of actual voltage value, for example, the second reference power source is steady
Determine the stabilized power source that output ripple under state is less than 1mV.
The actual voltage value of second reference power source is different from the actual voltage value of the first reference power source, wherein, " difference "
Implication enables processor U1 analog-to-digital conversion module to tell for difference therebetween.
For example, the actual voltage value of the first reference power source be equal to Fig. 1 in voltage measuring apparatus voltage measurement scope it is upper
Limit value, and the actual voltage value of the second reference power source is equal to 1/3rd of the higher limit.
Second reference power source equally can be the accurate electricity of the LDO outputs of product where voltage measuring apparatus in itself
Source；It can also be the power supply that external device (ED) is provided.
Processor U1 in step S240, control figure 1 calculates the sample voltage value conduct for obtaining the second reference power source of correspondence
Second sample voltage value, performs step S250 afterwards.
Second sample voltage value is to be inputted to voltage sampling circuit after the second reference power source, passes through voltage sampling circuit
Sampled output output voltage measured value.Specifically, processor U1 is calculated according to above-mentioned formula (1) obtains correspondence second
The sample voltage value of reference power source.
Step S250, according to the first sample voltage value VADC1, the second sample voltage value VADC2, the first reference power source reality
The actual voltage value V2 of magnitude of voltage V1 and the second reference power source is calculated and is obtained any sample voltage value being converted to corresponding power
Measure the downsampling factor K ' of magnitude of voltage.
Specifically,
Because downsampling factor K ' is to calculate to obtain by reference to the actual voltage value of power supply and corresponding sample voltage value,
Moreover, identical error can also be removed using two reference power sources, therefore, power supply to be measured is multiplied by using downsampling factor K '
The measurement magnitude of voltage that sampled voltage is worth to, the relative obtained downsampling factor K that calculated using formula (3) is multiplied by power supply to be measured
The measurement magnitude of voltage that sampled voltage is worth to, will be more nearly the actual voltage value of power supply to be measured, and then improve voltage measurement
The measurement accuracy of device.
Fig. 3 is a kind of electrical block diagram of embodiment according to calibrating installation of the present invention and calibration system.
According to Fig. 3, calibration system of the invention includes voltage measuring apparatus and calibrating installation 100.
The voltage measuring apparatus includes voltage sampling circuit and processor U1, and voltage sampling circuit is used for the power supply to input
Carry out voltage sample, the analog-to-digital conversion port P1 connections of the sampled output and processor of the voltage sampling circuit, processor U1
The digital quantity provided according to analog-to-digital conversion port, the sample voltage value for obtaining corresponding power is calculated by above-mentioned formula (1).
The calibrating installation 100 includes the first controlling switch S1, the first reference power source V1, the second controlling switch S2, the second ginseng
Examine power supply V2 and controller U2.
The first controlling switch S1 and the second controlling switch S2 can be hand control switch or be controlled by control
Device U2 automatic control switch.
For automatic control switch, first controlling switch S1 can be the analog switch chip for being controlled by controller U2
One switching channels, second controlling switch S2 can be another switching channels of same analog switch chip.
The first reference power source V1 via the first controlling switch S1 and voltage sampling circuit power input J0 connections.
The second reference power source V2 is connected via the power input of the second controlling switch S2 and voltage sampling circuit.
Controller U2 is arranged to be used for control process device U1 timesharing and completes the first reference power source V1 and second with reference to electricity
Source V2 voltage sample is calculated, with by the first reference power source V1 and the second reference power source V2 actual voltage value V1, V2 and point
Not Dui Ying the first reference power source V1 and the second reference power source V2 sample voltage value VADC1、VADC2Obtain any sample voltage value
Be converted to the downsampling factor K ' of the measurement magnitude of voltage of corresponding power.
In one particular embodiment of the present invention, the interaction between controller U2 and processor U1 can be included such as
Lower step：
Step S311, controller U2 according to closed the first controlling switch S1 and disconnect the second controlling switch S2 first
Feedback signal, the first calibration signal is sent to processor U1.
In the first controlling switch S1 and the second controlling switch S2 in the embodiment of hand switch, first feedback signal can
To be inputted by calibration personnel by human-computer interaction device, wherein, the human-computer interaction device is connected with controller.
The first controlling switch S1 and the second controlling switch S2 for automatic switch embodiment in, first feedback signal by
The program unit of controller U2 controlling switch S1 and S2 on off state is provided.In this embodiment, controller U2 is first controlled
First controlling switch S1 is closed and the second controlling switch S2 of control disconnects, then sends the first calibration signal to processor U1.
Step S321, processor U1 calculate the sampled voltage for obtaining the first reference power source V1 of correspondence according to the first calibration signal
Value is used as the first sample voltage value VADC1, and export the first sample voltage value VADC1To controller U2.
Step S312, controller U2 are receiving the first sample voltage value VADC1Afterwards, open according to having closed the second control
The second feedback signal of the first controlling switch is closed and disconnected, the second calibration signal is sent to processor U1.
In the first controlling switch S1 and the second controlling switch S2 in the embodiment of hand switch, second feedback signal can
To be inputted by calibration personnel by human-computer interaction device, wherein, the human-computer interaction device is connected with controller.
The first controlling switch S1 and the second controlling switch S2 for automatic switch embodiment in, second feedback signal by
The program unit of controller U2 controlling switch S1 and S2 on off state is provided.In this embodiment, controller U2 is first controlled
First controlling switch S1 disconnects and control the second controlling switch S2 closures, then sends the second calibration signal to processor U1.
Step S322, processor U1 calculate the sampled voltage for obtaining the second reference power source V2 of correspondence according to the second calibration signal
Value is used as the second sample voltage value VADC2, and export the second sample voltage value VADC2To controller U2.
Step S313, controller U2 are according to the first sample voltage value VADC1, the second sample voltage value VADC2, first with reference to electricity
Source V1 actual voltage value V1 and the second reference power source V2 actual voltage value V2 calculate downsampling factor K '.
Step S314, controller U2 are by downsampling factor K ' write-in processors U1 memory.
In step S314, controller U2 can also be by the flat of the downsampling factor K ' of the identical voltage measuring apparatus of two or more
In average write-in processor U1 memory.The partial circuit plate PCBA that the embodiment is suitable for only selecting in a batch (should
Circuit board has voltage measuring apparatus) downsampling factor K ' calculating is carried out, and calculate the sampling system for the partial circuit plate picked out
K ' average value is counted to correct the downsampling factor of the voltage measuring apparatus of all circuit boards of the batch.
In a further embodiment, downsampling factor K ' calculating can also be completed by processor U1 itself.The embodiment can
To comprise the following steps：
Step S411, controller U2 control the first controlling switch S1 closures and the second controlling switch S2 of control disconnects, afterwards
The first calibration signal is sent to processor U1.
Step S421, processor U1 calculate the sampled voltage for obtaining the first reference power source V1 of correspondence according to the first calibration signal
Value is used as the first sample voltage value VADC1, and return to the first completion signal to controller U2.
Step S412, controller U2 complete signal according to first and control the second controlling switch S2 closures and the control of control first
System switch S1 disconnect, it is rear to processor U1 send the second calibration signal.
Step S422, processor U1 calculate the sampled voltage for obtaining the second reference power source V2 of correspondence according to the second calibration signal
Value is used as the second sample voltage value VADC2, and return to the second completion signal to controller U2.
Step S413, controller U2 complete signal to processor U1 output revise signals, the revise signal bag according to second
Include the first reference power source V1 actual voltage value V1 and the second reference power source V2 actual voltage value V2.
Step S423, processor U1 are after revise signal is received, according to the first sample voltage value VADC1, second sampling
Magnitude of voltage VADC2, the first reference power source V1 actual voltage value V1 and the second reference power source V2 actual voltage value V2 calculate and deposit
Store up downsampling factor K '.
In order to reduce the correction cost of correction downsampling factor, special means for correcting 100 can be separately provided, to pass through school
Equipment 100 corrects the voltage measuring apparatus on all circuit boards, without setting respective calibration cartridge on each circuit board
Put.
In the embodiment for being separately provided means for correcting 100, the means for correcting 100 can include calibration connector (in figure
It is not shown), the first controlling switch S1, the first reference power source V1, the second controlling switch S2, the second reference power source V2 and controller
U2。
The calibration connector is arranged to be used for connecting the power input J0 of voltage sampling circuit.
The calibration connector can be connector, connection thimble etc. according to the form of power input J0 on circuit board.
First reference power source V1 is connected via the first controlling switch S1 with calibration connector.
Second reference power source V2 is connected via the second controlling switch S2 with calibration connector.
Controller U2 is arranged to be used for control process device U1 timesharing and completes the first reference power source V1 and the second reference power source
V2 voltage sample is calculated, to pass through the first reference power source V1 and the second reference power source V2 actual voltage value V1, V2 and difference
Correspondence the first reference power source V1 and the second reference power source V2 sample voltage value VADC1、VADC2Obtain turning any sample voltage value
It is changed to the downsampling factor K ' of the measurement magnitude of voltage of corresponding power.
In one particular embodiment of the present invention, according to Fig. 4, controller U2 can specifically be arranged to be used for holding
Row following steps：
Step S511, according to the first feedback signal for having closed the first controlling switch and the second controlling switch of disconnection, to place
Manage device U1 and send the first calibration signal.
Correspondence the first reference power source V1's that step S512, receiving processor U1 are obtained according to the calculating of the first calibration signal adopts
Sample magnitude of voltage is used as the first sample voltage value VADC1。
Step S513, is receiving the first sample voltage value VADC1Afterwards, according to closed the second controlling switch and disconnection
Second feedback signal of the first controlling switch, the second calibration signal is sent to processor U1.
Correspondence the second reference power source V2's that step S514, receiving processor U1 are obtained according to the calculating of the second calibration signal adopts
Sample magnitude of voltage is used as the second sample voltage value VADC2。
Step S515, according to the first sample voltage value VADC1, the second sample voltage value VADC2, the first reference power source V1 reality
Border magnitude of voltage V1 and the second reference power source V2 actual voltage value V2, which are calculated, to be obtained any sample voltage value being converted to correspondence electricity
The downsampling factor K ' of the measurement magnitude of voltage in source.
Step S516, downsampling factor K ' or the downsampling factor K ' of two or more voltage measuring apparatus average value are write
In the processor in memory.
In another specific embodiment of the present invention, according to Fig. 5, controller U2 can also specifically be arranged to use
In execution following steps：
Step S611, the first controlling switch S1 of control closures and the second controlling switch S2 of control are disconnected, and step is performed afterwards
S612。
Step S612, sends the first calibration signal, so that processor U1 is calculated according to the first calibration signal to processor U1
The first reference power source V1 of correspondence sample voltage value is obtained as the first sample voltage value VADC1。
Step S613, receiving processor U1 obtain the first sample voltage value V in calculatingADC1First returned afterwards completes letter
Number.
Step S614, completes signal according to first and controls the second controlling switch S2 closures and the first controlling switch S1 of control
Disconnect, step S615 is performed afterwards.
Step S615, sends the second calibration signal, so that processor U1 is calculated according to the second calibration signal to processor U1
The second reference power source V2 of correspondence sample voltage value is obtained as the second sample voltage value VADC2。
Step S616, receiving processor U1 obtain the second sample voltage value V in calculatingADC2Second returned afterwards completes letter
Number.
Step S617, signal is completed to actual voltage value of the processor U1 outputs with the first reference power source V1 according to second
V1 and the second reference power source V2 actual voltage value V2 revise signal, so that processor is after revise signal is received, according to
First sample voltage value VADC1, the second sample voltage value VADC2, the first reference power source V1 actual voltage value V1 and second ginseng
The actual voltage value V2 for examining power supply V2 is calculated and is stored downsampling factor K '.
The various embodiments described above primary focus describes the difference with other embodiment, but those skilled in the art should be clear
Chu, the various embodiments described above can be used alone or be combined with each other as needed.
It is described above various embodiments of the present invention, described above is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.In the case of without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes will be apparent from for the those of ordinary skill in art field.The selection of term used herein, purport
The principle, practical application or the technological improvement to the technology in market of each embodiment are best being explained, or is leading this technology
Other those of ordinary skill in domain are understood that each embodiment disclosed herein.The scope of the present invention is limited by appended claims
It is fixed.
Claims (10)
1. a kind of calibration method for voltage measuring apparatus, the voltage measuring apparatus includes voltage sampling circuit and processing
Device, the voltage sampling circuit is used to carry out voltage sample, the sampled output of the voltage sampling circuit to the power supply of input
It is connected with the analog-to-digital conversion port of the processor, the digital quantity that the processor is provided according to the analog-to-digital conversion port is calculated
Obtain the sample voltage value of the correspondence power supply, it is characterised in that the calibration method includes the following steps sequentially carried out：
The first reference power source is inputted to the voltage sampling circuit；
The processor is controlled to calculate the sample voltage value for obtaining correspondence first reference power source as the first sample voltage value；
The second reference power source is inputted to the voltage sampling circuit；
The processor is controlled to calculate the sample voltage value for obtaining correspondence second reference power source as the second sample voltage value；
According to first sample voltage value, second sample voltage value, the actual voltage value of first reference power source and
The actual voltage value of second reference power source calculates the measurement voltage for obtaining being converted to any sample voltage value corresponding power
The downsampling factor of value.
2. a kind of calibrating installation for voltage measuring apparatus, the voltage measuring apparatus includes voltage sampling circuit and processing
Device, the voltage sampling circuit is used to carry out voltage sample, the sampled output of the voltage sampling circuit to the power supply of input
It is connected with the analog-to-digital conversion port of the processor, the digital quantity that the processor is provided according to the analog-to-digital conversion port is calculated
Obtain the sample voltage value of the correspondence power supply, it is characterised in that the calibrating installation includes：
Connector is calibrated, the calibration connector is arranged to be used for connecting the power input of the voltage sampling circuit；
First controlling switch；
First reference power source, first reference power source is connected via first controlling switch with the calibration connector；
Second controlling switch；
Second reference power source, second reference power source is connected via second controlling switch with the calibration connector；With
And,
Controller, the controller is arranged to be used for controlling the processor timesharing to complete first reference power source and described
The voltage sample of second reference power source is calculated, to pass through the virtual voltage of first reference power source and second reference power source
Value and the sampled voltage of first reference power source and second reference power source is corresponded to respectively be worth to any sampled voltage
Value is converted to the downsampling factor of the measurement magnitude of voltage of corresponding power.
3. calibrating installation according to claim 2, it is characterised in that the control implement body is arranged to be used for：
According to the first feedback signal for having closed the first controlling switch and the second controlling switch of disconnection, sent to the processor
First calibration signal；
Receive the sampling electricity that the processor calculates obtained correspondence first reference power source according to first calibration signal
Pressure value is used as the first sample voltage value；
After first sample voltage value is received, according to closed the second controlling switch and disconnect the first controlling switch
The second feedback signal, to the processor send the second calibration signal；
Receive the sampling electricity that the processor calculates obtained correspondence second reference power source according to second calibration signal
Pressure value is used as the second sample voltage value；
According to first sample voltage value, second sample voltage value, the actual voltage value of first reference power source and
The actual voltage value of second reference power source calculates the downsampling factor；
The downsampling factor is write in the processor in memory.
4. the calibrating installation according to Claims 2 or 3, it is characterised in that the calibrating installation also includes and the control
The human-computer interaction device of device connection.
5. the calibrating installation according to Claims 2 or 3, it is characterised in that the controller is also configured to be used for automatically
Control the on off state of first controlling switch and second controlling switch.
6. calibrating installation according to claim 5, it is characterised in that first controlling switch is to be controlled by the control
One switching channels of the analog switch chip of device, second controlling switch switchs for another of the analog switch chip
Passage.
7. calibrating installation according to claim 5, it is characterised in that the control implement body is arranged to be used for：
Control the first controlling switch close and control the second controlling switch disconnect, it is rear to the processor send first calibrate
Signal, so that the processor calculates the sampled voltage for obtaining correspondence first reference power source according to first calibration signal
Value is used as the first sample voltage value；
Receive the first completion signal that the processor is returned after calculating obtains first sample voltage value；
Signal, which is completed, according to described first controls the second controlling switch closure and control the first controlling switch disconnection,
It is rear send the second calibration signal to the processor obtained pair so that the processor is calculated according to second calibration signal
The sample voltage value of second reference power source is answered as the second sample voltage value；
Receive the second completion signal that the processor is returned after calculating obtains second sample voltage value；And,
Signal is completed according to described second, and the actual voltage value and described the with first reference power source is exported to processor
The revise signal of the actual voltage value of two reference power sources, so that the processor is after the revise signal is received, according to institute
State the first sample voltage value, second sample voltage value, the actual voltage value of first reference power source and second ginseng
The actual voltage value for examining power supply calculates and stores the downsampling factor.
8. a kind of calibration system, it is characterised in that including voltage measuring apparatus and calibrating installation, the voltage measuring apparatus includes
Voltage sampling circuit and processor, the voltage sampling circuit are used to carry out voltage sample to the power supply of input, and the voltage is adopted
The sampled output of sample circuit is connected with the analog-to-digital conversion port of the processor, and the processor is according to the analog-to-digital conversion end
The digital quantity that mouth is provided calculates the sample voltage value for obtaining the correspondence power supply；
The calibrating installation includes：
First controlling switch；
First reference power source, first reference power source is via first controlling switch and the power supply of the voltage sampling circuit
Input is connected；
Second controlling switch；
Second reference power source, second reference power source is via second controlling switch and the power supply of the voltage sampling circuit
Input is connected；And,
Controller, the controller is arranged to be used for controlling the processor timesharing to complete first reference power source and described
The voltage sample of second reference power source is calculated, to pass through the virtual voltage of first reference power source and second reference power source
Value and the sampled voltage of first reference power source and second reference power source is corresponded to respectively be worth to any sampled voltage
Value is converted to the downsampling factor of the measurement magnitude of voltage of corresponding power.
9. calibration system according to claim 8, it is characterised in that
The controller is according to having closed the first controlling switch and having disconnected the first feedback signal of the second controlling switch, to described
Processor sends the first calibration signal；
The processor calculates the sample voltage value work for obtaining correspondence first reference power source according to first calibration signal
For the first sample voltage value, and first sample voltage value is exported to the controller；
The controller is after first sample voltage value is received, according to having closed the second controlling switch and disconnected the
Second feedback signal of one controlling switch, the second calibration signal is sent to the processor；
The processor calculates the sample voltage value work for obtaining correspondence second reference power source according to second calibration signal
For the second sample voltage value, and second sample voltage value is exported to the controller；
The controller is according to first sample voltage value, second sample voltage value, the reality of first reference power source
The actual voltage value of border magnitude of voltage and second reference power source calculates the downsampling factor；
The controller writes the downsampling factor in the memory of the processor.
10. calibration system according to claim 8, it is characterised in that
The controller controls the first controlling switch closure and controls second controlling switch to disconnect, it is backward described
Processor sends the first calibration signal；
The processor calculates the sample voltage value work for obtaining correspondence first reference power source according to first calibration signal
For the first sample voltage value, and return to first to the controller and complete signal；
The controller completes signal according to described first and controls second controlling switch to close and control first control
Switch off, it is rear to the processor send the second calibration signal；
The processor calculates the sample voltage value work for obtaining correspondence second reference power source according to second calibration signal
For the second sample voltage value, and return to second to the controller and complete signal；
The controller completes signal to processor according to described second and exports revise signal, and the revise signal includes described the
The actual voltage value of the actual voltage value of one reference power source and second reference power source；
The processor is after the revise signal is received, according to first sample voltage value, the second sampling electricity
The actual voltage value of pressure value, the actual voltage value of first reference power source and second reference power source calculates and stores described
Downsampling factor.
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