CN110007144A - A kind of frequency measurement method and associated component of input signal - Google Patents
A kind of frequency measurement method and associated component of input signal Download PDFInfo
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- CN110007144A CN110007144A CN201910361641.2A CN201910361641A CN110007144A CN 110007144 A CN110007144 A CN 110007144A CN 201910361641 A CN201910361641 A CN 201910361641A CN 110007144 A CN110007144 A CN 110007144A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/001—Measuring real or reactive component; Measuring apparent energy
- G01R21/003—Measuring reactive component
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
- G01R23/10—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into a train of pulses, which are then counted, i.e. converting the signal into a square wave
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- Engineering & Computer Science (AREA)
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- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
This application discloses a kind of frequency measurement methods of input signal, are applied to metering chip, comprising: obtain the communication frame that MCU is issued；RCH clock frequency is determined using the communication frame；Using the RCH clock frequency as sample frequency, the input signal is sampled and calculated, the frequency of the input signal is obtained.Wherein, the communication frame that MCU is issued is using the crystal oscillator of MCU as constant clock source, RCH clock frequency is calculated according to the communication frame, and then known RCH clock frequency calculates the frequency of input signal, always the frequency foundation using the crystal oscillator of MCU as standard constant in whole process, even if RCH clock frequency is influenced by temperature-time, the present invention still can accurately calculate the frequency of input signal.Correspondingly, disclosed herein as well is a kind of frequency measuring system of input signal with corresponding beneficial effect, a kind of reactive power measuring method, system and a kind of metering chips.
Description
Technical field
The present invention relates to electronic circuit technology field, in particular to the frequency measurement method and relevant group of a kind of input signal
Part.
Background technique
At present when measurement reactive power, consider chip cost, user in the design low side chip when, it is general using number product
Device is divided to realize.Digital integrator is required to accurately measure the frequency of input signal, then calculates nothing by frequency variation
Function offset.
Generally there are two selections for the clock source that digital integrator needs, first is that external crystal-controlled oscillation, consider its operating procedure and hard
Part cost is not easy to realize；Second is that the internal high frequency oscillating circuit RCH of metering chip, since the clock frequency of RCH can be with temperature
Retired with the time changes, therefore when RCH makees clock source can not accurately calculate the frequency of input signal.
Therefore, how to provide a kind of scheme of solution above-mentioned technical problem is that current those skilled in the art need to solve
Problem.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of frequency measurement method of input signal and associated component, with
Just the frequency for accurately entering signal can be calculated.Its concrete scheme is as follows:
A kind of frequency measurement method of input signal is applied to metering chip, comprising:
Obtain the communication frame that MCU is issued；
RCH clock frequency is determined using the communication frame；
Using the RCH clock frequency as sample frequency, the input signal is sampled and calculated, is obtained described defeated
Enter the frequency of signal.
Preferably, the process that RCH clock frequency is determined using the communication frame, is specifically included:
Using the RCH clock frequency as sample frequency, N number of bit in the communication frame is sampled, is sampled
Count value TN；
Utilize the first formulaDetermine the RCH clock frequency, wherein Fr is the RCH clock frequency, and K is
The baud rate of the MCU.
Preferably, it is described N number of bit in the communication frame is sampled after, comprising:
Judge whether the time interval on the mark variation edge of the communication frame meets preset ratio range；
If so, being sampled to N number of bit in the communication frame；
Wherein, the mark variation is along the variation edge for being same variation tendency.
Preferably, the communication frame is the frame head character of pre-arranged code.
Correspondingly, being applied to metering chip the invention also discloses a kind of frequency measuring system of input signal, comprising:
Communication frame obtains module, for obtaining the communication frame of MCU sending；
First computing module, for determining RCH clock frequency using the communication frame；
Second computing module, for being sampled to the input signal using the RCH clock frequency as sample frequency
And calculate, obtain the frequency of the input signal.
Correspondingly, being applied to metering chip the invention also discloses a kind of reactive power measuring method, comprising:
Using the frequency measurement method of input signal described above, the frequency of input signal is obtained；
According to the frequency of the input signal, reactive compensation and nothing are carried out to the input signal by digital integrator
The measurement of function power.
Preferably, the frequency according to the input signal carries out nothing to the input signal by digital integrator
The process of function compensation and the measurement of reactive power, specifically includes:
According to the second formulaIdle benefit is carried out to the input signal by the digital integrator
It repays, wherein Δ Err is reactive power error, f0For standard frequency, f1For the frequency of the input signal；
The reactive power of the input signal after reactive compensation is calculated by the digital integrator.
Correspondingly, the invention also discloses a kind of wattless power measurement systems, comprising:
Frequency acquisition module obtains the frequency of input signal for the frequency measurement method using input signal described above
Rate；
Power measurement module, for the frequency according to the input signal, by digital integrator to the input signal
Carry out reactive compensation and the measurement of reactive power.
Correspondingly, being stored with process of measurement, the survey in the metering chip the invention also discloses a kind of metering chip
Range sequence is performed the step of realizing reactive power measuring method as described above.
The invention discloses a kind of frequency measurement methods of input signal, are applied to metering chip, comprising: obtain MCU hair
Communication frame out；RCH clock frequency is determined using the communication frame；Using the RCH clock frequency as sample frequency, to described
Input signal is sampled and is calculated, and the frequency of the input signal is obtained.Wherein, the communication frame that MCU is issued is with the crystal oscillator of MCU
As constant clock source, RCH clock frequency is calculated according to the communication frame, and then known RCH clock frequency calculates input signal
Frequency, the frequency foundation using the crystal oscillator of MCU as standard constant always in whole process, even if RCH clock frequency is by temperature
The influence of time is spent, the present invention still can accurately calculate the frequency of input signal.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of step flow chart of the frequency measurement method of input signal in the embodiment of the present invention；
Fig. 2 is a kind of serial ports waveform of frame head character in the embodiment of the present invention；
Fig. 3 is a kind of structure distribution figure of the frequency measuring system of input signal in the embodiment of the present invention；
Fig. 4 is a kind of step flow chart of reactive power measuring method in the embodiment of the present invention；
Fig. 5 is a kind of structure distribution figure of wattless power measurement system in the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a kind of frequency measurement methods of input signal, are applied to metering chip, referring to Fig. 1 institute
Show, comprising:
S11: the communication frame that MCU is issued is obtained；
Specifically, this communication frame is other than the effect of original read-write chip data, primarily to making metering chip true
The deviation of itself fixed RCH.
S12: RCH clock frequency is determined using the communication frame；
Wherein, the process for being determined RCH clock frequency described in step S12 using the communication frame, is specifically included:
Using the RCH clock frequency as sample frequency, N number of bit in the communication frame is sampled, is sampled
Count value TN；
Utilize the first formulaDetermine the RCH clock frequency, wherein Fr is the RCH clock frequency, and K is
The baud rate of the MCU.
It is understood that the first formula derivation according to be sample objects absolute time length it is constant, with communication frame
Sampling time that baud rate is calculated and should be equal with the sampling time that RCH clock frequency, sample count values obtain, according to
Relation of equality is derived from the first formula.
Further, it is described above N number of bit in the communication frame is sampled after, comprising:
Judge whether the time interval on the mark variation edge of the communication frame meets preset ratio range；
If so, being sampled to N number of bit in the communication frame；
Wherein, the mark variation is along the variation edge for being same variation tendency.That is, mark here changes edge,
Both it can be all failing edge, can also be all rising edge, it should be noted that mark variation becomes along same variation is necessary for
Gesture influences to avoid because of wave distortion bring caused by external devices.
It is understood that generally selecting the frame head character of specific communication agreement as sample objects in the present embodiment, institute
The frame head character that communication frame is pre-arranged code is stated, metering chip is facilitated accurately and efficiently to obtain RCH clock frequency.
It is adopted specifically, frame head character can be chosen to be used as from the pre-arranged code of a variety of different proportion relationships such as 0x7D, 0x77
Communication frame when sample, herein and without concrete restriction.
By taking frame head character 0x7D as an example, the serial ports waveform of 0x7D shown in Figure 2, since there are filtered electricals on communication line
Hold, step S11 obtains the process of communication frame by reasons such as the isolating devices such as optocoupler, telecommunication circuit with working environment change
Change, communication waveforms is caused with the distortion of different situations, the practical wave in waveform such as Fig. 2 that final metering chip pin receives
Shape.If only biggish error can be generated as the sample objects of communication frame using T1, made in contrast in T2 or T3 with failing edge
For time label, because the variation edge of same variation tendency is distorted, situation is approximate, using T2 or T3 as the sampling of communication frame
Object can influence to avoid wave distortion bring.
Further, because existing there may be a large amount of interference noise in practical communication and mistakenly working as interference signal
Do the possibility of normal waveform signal, it is therefore necessary to using communication frame mark variation edge time scale come exclude it is this can
Can, namely above " judge whether the time interval on the mark variation edge of the communication frame meets preset ratio range ", in Fig. 2
In then need to judge whether T2:T3 is similar to 1/4, consider measurement accuracy, T2:T3 is difficult to be accurate to 1/4, usually in setting one
Center value be 1/4 preset ratio range, mainly within the scope of this preset ratio, all think communication frame mark variation edge when
Between interval meet the communication ratio of normal waveform signal, confirm that the communication frame of sampling is not interference noise.Certainly, in addition in Fig. 2
Outside the 1/4 of citing, it is also an option that other proportionate relationship verifies whether as normal waveform signal.
Although it is understood that illustrate how to take into account by taking asynchronous serial communication interface as an example in the present embodiment communication and
RCH clock rate testing, but the scheme in the present embodiment can also be applied and communicate (such as in SPI or IIC) in synchronous serial interface, meter
Amount chip can directly measure the mark variation of communication frame along calculating RCH clock frequency.As it can be seen that taking into account the RCH of serial communication
Clock frequency determines, provides many conveniences for the exploitation design of developer.
S13: using the RCH clock frequency as sample frequency, the input signal is sampled and is calculated, institute is obtained
State the frequency of input signal.
Specifically, sampling to input signal, then pass through input frequency calculation formulaObtain input signal
Frequency f1, wherein FrFor RCH clock frequency, n is the input signal of a cycle with FrSampling number when sampling.
The embodiment of the invention discloses a kind of frequency measurement methods of input signal, are applied to metering chip, comprising: obtain
The communication frame that MCU is issued；RCH clock frequency is determined using the communication frame；Using the RCH clock frequency as sample frequency,
The input signal is sampled and calculated, the frequency of the input signal is obtained.Wherein, the communication frame that MCU is issued is with MCU
Crystal oscillator RCH clock frequency is calculated according to the communication frame as constant clock source, and then known RCH clock frequency is defeated to calculate
Enter the frequency of signal, the frequency foundation using the crystal oscillator of MCU as standard constant always in whole process, even if RCH clock frequency
It is influenced by temperature-time, the present embodiment still can accurately calculate the frequency of input signal.
Correspondingly, it is applied to metering chip the embodiment of the invention also discloses a kind of frequency measuring system of input signal,
It is shown in Figure 3, comprising:
Communication frame obtains module 11, for obtaining the communication frame of MCU sending；
First computing module 12, for determining RCH clock frequency using the communication frame；
Second computing module 13, for being adopted to the input signal using the RCH clock frequency as sample frequency
Sample simultaneously calculates, and obtains the frequency of the input signal.
Wherein, the communication frame that MCU is issued calculates RCH clock using the crystal oscillator of MCU as constant clock source, according to the communication frame
Frequency, and then known RCH clock frequency calculates the frequency of input signal, in whole process always using the crystal oscillator of MCU as mark
Quasi- constant frequency foundation, even if RCH clock frequency is influenced by temperature-time, the present embodiment still can be calculated accurately
The frequency of input signal.
Correspondingly, being applied to metering chip, referring to figure the embodiment of the invention also discloses a kind of reactive power measuring method
Shown in 4, comprising:
S21: using the frequency measurement method of input signal described above, the frequency of input signal is obtained；
The content of the specific frequency measurement method in relation to input signal, the description being referred in foregoing embodiments, herein
It repeats no more.
S22: according to the frequency of the input signal, by digital integrator to the input signal carry out reactive compensation with
And the measurement of reactive power.
Specifically, according to the frequency of the input signal described in step S22, by digital integrator to the input signal
The process for carrying out reactive compensation and the measurement of reactive power includes:
S221: according to the second formulaNothing is carried out to the input signal by the digital integrator
Function compensation, wherein Δ Err is reactive power error, f0For the standard frequency of network system, f1For the frequency of the input signal；
S222: the reactive power of the input signal after reactive compensation is calculated by the digital integrator.
It is understood that the working principle of digital integrator are as follows:
Wherein, f is to calculate frequency, and t is to calculate the time.
Work as actual signal, that is, the frequency f of input signal1When not being 50Hz, there are reactive power errors for calculating:
It in view of the frequency fluctuation of power grid is not too big, is generally fluctuated near 50Hz, it is second which, which can simplify,
It is as follows to simplify process for formula:
That is, whenever actual frequency changes 0.1Hz, reactive power error changes 0.2%.
The frequency f of input signal has been obtained in the step s 211, according to the principles illustrated pair of above digital integrator
Input signal carries out reactive compensation and the measurement of reactive power.
A kind of reactive power measuring method is disclosed in the present embodiment, is applied to metering chip, comprising: is utilized described above
The frequency measurement method of input signal obtains the frequency of input signal；According to the frequency of the input signal, pass through digital integration
Device carries out reactive compensation and the measurement of reactive power to the input signal.
The reactive power measuring method of the present embodiment be not related to add external crystal-controlled oscillation, by accurately obtain RCH clock frequency,
The method of error compensation avoids RCH from deviating the influence to reactive power, is only achieved that with simple digital integrator principle
Reactive measurement not only ensure that measurement accuracy, but also take into account the cost of designer.
Correspondingly, the embodiment of the invention also discloses a kind of wattless power measurement system, it is shown in Figure 5, comprising:
Frequency acquisition module 21 obtains input signal for the frequency measurement method using input signal described above
Frequency；
Power measurement module 22 believes the input by digital integrator for the frequency according to the input signal
Number carry out reactive compensation and the measurement of reactive power.
The reactive power measuring method of the present embodiment be not related to add external crystal-controlled oscillation, by accurately obtain RCH clock frequency,
The method of error compensation avoids RCH from deviating the influence to reactive power, is only achieved that with simple digital integrator principle
Reactive measurement not only ensure that measurement accuracy, but also take into account the cost of designer.
Correspondingly, it is stored with process of measurement in the metering chip the embodiment of the invention also discloses a kind of metering chip,
The process of measurement is performed the step of realizing reactive power measuring method as described above.
Wherein, the specific content in relation to reactive power measuring method in the present embodiment, is referred to phase in foregoing embodiments
Description is closed, details are not described herein again.
Wherein, the metering chip in the embodiment of the present invention has identical with reactive power measuring method in foregoing embodiments
Beneficial effect, details are not described herein again.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
Detailed Jie has been carried out to the frequency measurement method and associated component of a kind of input signal provided by the present invention above
It continues, used herein a specific example illustrates the principle and implementation of the invention, and the explanation of above embodiments is only
It is to be used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, according to this hair
Bright thought, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification should not manage
Solution is limitation of the present invention.
Claims (9)
1. a kind of frequency measurement method of input signal, which is characterized in that be applied to metering chip, comprising:
Obtain the communication frame that MCU is issued；
RCH clock frequency is determined using the communication frame；
Using the RCH clock frequency as sample frequency, the input signal is sampled and calculated, obtains the input letter
Number frequency.
2. frequency measurement method according to claim 1, which is characterized in that described to determine RCH clock using the communication frame
The process of frequency, specifically includes:
Using the RCH clock frequency as sample frequency, N number of bit in the communication frame is sampled, sample count is obtained
Value TN；
Utilize the first formulaDetermine the RCH clock frequency, wherein Fr is the RCH clock frequency, and K is described
The baud rate of MCU.
3. frequency measurement method according to claim 2, which is characterized in that described to be carried out to bit N number of in the communication frame
After sampling, comprising:
Judge whether the time interval on the mark variation edge of the communication frame meets preset ratio range；
If so, being sampled to N number of bit in the communication frame；
Wherein, the mark variation is along the variation edge for being same variation tendency.
4. frequency measurement method according to any one of the claim 1 to 3, which is characterized in that the communication frame is pre-arranged code
Frame head character.
5. a kind of frequency measuring system of input signal, which is characterized in that be applied to metering chip, comprising:
Communication frame obtains module, for obtaining the communication frame of MCU sending；
First computing module, for determining RCH clock frequency using the communication frame；
Second computing module, for using the RCH clock frequency as sample frequency, the input signal being sampled and being counted
It calculates, obtains the frequency of the input signal.
6. a kind of reactive power measuring method, which is characterized in that be applied to metering chip, comprising:
Using the frequency measurement method of any one of claim 1 to 5 input signal, the frequency of input signal is obtained；
According to the frequency of the input signal, reactive compensation and idle function are carried out to the input signal by digital integrator
The measurement of rate.
7. reactive power measuring method according to claim 6, which is characterized in that the frequency according to the input signal
Rate is carried out the process of reactive compensation and the measurement of reactive power to the input signal by digital integrator, specifically included:
According to the second formulaReactive compensation is carried out to the input signal by the digital integrator,
Middle Δ Err is reactive power error, f0For standard frequency, f1For the frequency of the input signal；
The reactive power of the input signal after reactive compensation is calculated by the digital integrator.
8. a kind of wattless power measurement system characterized by comprising
Frequency acquisition module obtains defeated for the frequency measurement method using any one of claim 1 to 5 input signal
Enter the frequency of signal；
Power measurement module carries out the input signal by digital integrator for the frequency according to the input signal
Reactive compensation and the measurement of reactive power.
9. a kind of metering chip, which is characterized in that be stored with process of measurement in the metering chip, the process of measurement is performed
The step of Shi Shixian reactive power measuring method as claimed in claim 6.
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| CN111722010A (en) * | 2020-06-29 | 2020-09-29 | 杭州万高科技股份有限公司 | Metering data acquisition method and metering system |
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