CN108957122A - A kind of frequency determination methods and device of voltage - Google Patents
A kind of frequency determination methods and device of voltage Download PDFInfo
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- CN108957122A CN108957122A CN201710347878.6A CN201710347878A CN108957122A CN 108957122 A CN108957122 A CN 108957122A CN 201710347878 A CN201710347878 A CN 201710347878A CN 108957122 A CN108957122 A CN 108957122A
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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
- G01R23/06—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into an amplitude of current or voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/17—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values giving an indication of the number of times this occurs, i.e. multi-channel analysers
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- Measuring Frequencies, Analyzing Spectra (AREA)
Abstract
The invention discloses a kind of frequency determination methods of voltage, comprising: samples to input voltage, obtains voltage sample value；It is default judge that the period arrives when, count the default Zero-crossing Number for judging the voltage sample value in the period, judge whether the Zero-crossing Number is greater than preset threshold；Wherein, zero passage is used to indicate position when voltage sample value reaches critical detection voltage value during changing over time；When the Zero-crossing Number is greater than the preset threshold, determine that the frequency of the input voltage is the first working frequency；When the Zero-crossing Number is less than the preset threshold, determine that the frequency of the input voltage is the second working frequency.The present invention further simultaneously discloses a kind of frequency determining device of voltage.
Description
Technical field
The present invention relates to frequency determination methods and device that the frequency of voltage determines technology more particularly to a kind of voltage.
Background technique
In different countries, electric appliance has specific limitation, relatively common work to the alternating voltage working frequency of access
Working frequency has 50 hertz (Hz) and 60Hz, wherein the voltage power supply frequency in China is 50Hz, the voltage power supply of some countries in Europe
Frequency is 60Hz.For an electric appliance manufacturer, the electric appliance produced may sell to multiple countries, therefore,
A electric appliance to export to foreign countries need to meet multinational or regional requirement, i.e., the electric appliance at various frequencies can be normal and can be stablized
Work.
Under normal circumstances, different operating frequency also has certain difference for some configurations and control of electric appliance, therefore,
When in use, electric appliance need to accurately determine the frequency of current access alternating voltage.Method common at present is: electric appliance is upper
The frequency that access alternating voltage is judged in 1 second (s) of electricity, so that it is determined that working frequency out, hereafter, electric appliance will no longer be sentenced again
Fixed, for the countries and regions of voltage ambient stable, such sex determination will not have any problem.However, for
Some voltage environment are unstable even to fluctuate biggish country, if electric appliance at work, accesses the frequency of alternating voltage
Suddenly change, and when electric appliance does not determine accurately, electric appliance possibly can not according to the stable work of normal preset mode or
There is abnormal operation etc..
Summary of the invention
For the above technical issues, an embodiment of the present invention is intended to provide a kind of frequency determination methods of voltage and device,
Can real-time judge go out the frequency situation of change of the alternating voltage that electric appliance is currently accessed, so that it is guaranteed that the work that electric appliance is normal and stable
Make.
The technical scheme of the present invention is realized as follows:
Input voltage is sampled, voltage sample value is obtained；
It is default judge that the period arrives when, count the Zero-crossing Number of the voltage sample value in the default judgement period, judge
Whether the Zero-crossing Number is greater than preset threshold；Wherein, zero passage is for indicating that voltage sample value reaches during changing over time
Position when critical detection voltage value；
When the Zero-crossing Number is greater than the preset threshold, determine that the frequency of the input voltage is the first working frequency；
When the Zero-crossing Number is less than the preset threshold, determine that the frequency of the input voltage is the second working frequency.
Described to sample to input voltage in above scheme, obtaining voltage sample value includes:
Input voltage is rectified and is depressured；
To decompression, treated that voltage samples, and obtains voltage sample value.
In above scheme, the Zero-crossing Number of the voltage sample value in the statistics default judgement period, comprising:
There is time for being equal to the critical detection voltage value in all voltage sample values counted in the default judgement period
Number, and the number counted is determined as the Zero-crossing Number in the default judgement period.
In above scheme, the method also includes: based on the Zero-crossing Number in the default judgement period, determine the input
The frequency of voltage；
It is display data by the frequency conversion of the input voltage and exports display.
In above scheme, the Zero-crossing Number based in the default judgement period determines the frequency of the input voltage,
Include:
The Zero-crossing Number in the unit time is extrapolated according to the Zero-crossing Number in the default judgement period；
By the Zero-crossing Number in the unit time divided by 2, quotient calculated is determined as to the frequency of the input voltage.
In above scheme, the method also includes: when receiving the acquisition request for the frequency of the input voltage, by institute
The frequency for stating input voltage is sent to requesting party, so that the requesting party carries out corresponding position according to the frequency of the input voltage
Reason.
The embodiment of the invention also provides a kind of frequency determining device of voltage, described device includes:
Sampling module obtains voltage sample value for sampling to input voltage；
Counting module, for it is default judge that the period arrives when, count the default voltage sample value judged in the period
Zero-crossing Number；Wherein, zero passage is for indicating when voltage sample value reaches critical detection voltage value during changing over time
Position；
Judgment module, for judging whether the Zero-crossing Number is greater than preset threshold；The Zero-crossing Number is greater than the default threshold
When value, determine that the frequency of the input voltage is the first working frequency；When the Zero-crossing Number is less than the preset threshold, institute is determined
The frequency for stating input voltage is the second working frequency.
In above scheme, the sampling module is specifically used for:
Input voltage is rectified and is depressured；
To decompression, treated that voltage samples, and obtains voltage sample value.
In above scheme, the counting module is specifically used for: all voltage samples in the statistics default judgement period
Value occurs being equal to the number of the critical detection voltage value, and the number counted was determined as in the default judgement period
Zero-crossing Number.
In above scheme, described device further include:
Determining module, for determining the frequency of the input voltage based on the Zero-crossing Number in the default judgement period；
Conversion module, for being display data by the frequency conversion of the input voltage and exporting display.
In above scheme, the determining module is also used to extrapolate list according to the Zero-crossing Number in the default judgement period
Zero-crossing Number in the time of position；By the Zero-crossing Number in the unit time divided by 2, quotient calculated is determined as the input voltage
Frequency.
In above scheme, described device further include:
Receiving module triggers sending module when for receiving the acquisition request for being directed to the frequency of the input voltage；It sends
Module, for sending the frequency of the input voltage to requesting party, so that the requesting party is according to the frequency of the input voltage
Rate carries out respective handling.
The frequency determination methods and device of voltage provided in an embodiment of the present invention, sample input voltage, obtain electricity
Press sampled value；It is default judge that the period arrives when, count the Zero-crossing Number of the voltage sample value in the default judgement period, judge
Whether the Zero-crossing Number is greater than preset threshold；Wherein, zero passage is for indicating that voltage sample value reaches during changing over time
Position when critical detection voltage value；When the Zero-crossing Number is greater than the preset threshold, determine that the frequency of the input voltage is
First working frequency；Such as the 60Hz working frequency in international common electrical work voltage environment；The Zero-crossing Number is less than described pre-
If when threshold value, determining that the frequency of the input voltage is the second working frequency, in international common electrical work voltage environment
50Hz working frequency.As it can be seen that the embodiment of the present invention is capable of the voltage value of real-time detection access voltage, is changed by voltage value and obtained
Frequency information determines frequency size, after frequency variation, according to the working frequency of the frequency correction electric appliance after variation, thus really
It has protected electric appliance and has remained to normal and stable work when the frequency for accessing voltage changes.
Detailed description of the invention
Fig. 1 is a kind of implementation process schematic diagram of the frequency determination methods of voltage disclosed in the embodiment of the present invention one；
Fig. 2 is a kind of composed structure schematic diagram of zero passage detection counting circuit；
Fig. 3 is the alternating voltage waveform schematic diagram before a kind of rectification；
Fig. 4 is the alternating voltage waveform schematic diagram after a kind of rectification；
Fig. 5 is the voltage waveform view after a kind of decompression；
Fig. 6 is a kind of composed structure schematic diagram of the frequency determining device of voltage disclosed in the embodiment of the present invention one；
Fig. 7 is a kind of implementation process schematic diagram of the frequency determination methods of voltage disclosed in the embodiment of the present invention two；
Fig. 8 is a kind of implementation process schematic diagram of the frequency determination methods of voltage disclosed in the embodiment of the present invention three.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention make into
It is described in detail to one step, described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, all other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
Embodiment one
Fig. 1 is a kind of implementation process schematic diagram of the frequency determination methods of voltage disclosed by the embodiments of the present invention, referring to Fig.1
It is shown, the frequency determination methods of the voltage of the present embodiment the following steps are included:
Step 101: input voltage being sampled, voltage sample value is obtained.
Specifically, described to sample to input voltage, obtaining voltage sample value includes: to be rectified simultaneously to input voltage
Decompression；To decompression, treated that voltage samples, and obtains voltage sample value.That is, before carrying out voltage sample, it is right
Input voltage carries out rectification and decompression processing, and using the voltage after decompression as the sampled voltage that will be sampled, then from
Voltage sample value is obtained in the sampled voltage.
Specifically, method input voltage sampled include: by zero passage sample count circuit to input voltage into
Row sampling, to obtain voltage sample value.Wherein, the composed structure of the zero passage sample count circuit is as shown in Figure 4.The electricity
Sub- electric appliance includes: electromagnetic oven, micro-wave oven and refrigerator etc..
Specifically, 1) electric appliance or frequency determining device rectify input voltage, are rectified after accessing power supply
Voltage afterwards, as shown in Figure 2 and Figure 3, Fig. 2 are the alternating voltage waveform schematic diagram before a kind of rectification, and Fig. 3 is after a kind of rectification
Alternating voltage waveform schematic diagram；In China, alternating current is 220 volts (V), and the original alternating voltage maximum value of access is exactly 220V, is connect
The original alternating voltage entered is as shown in Figure 2.As shown in figure 4, the original alternating voltage is by whole in zero passage detection counting circuit
After the rectification for flowing diode D1 and rectifier diode D2, become unidirectional pulsating volage, thus the voltage after being rectified,
As shown in Figure 3.It is worth noting that, the fluctuating range of this pulsating volage is consistent with the original alternating voltage and is
In real time with input voltage waveform variation, only its period becomes the half of original input AC electricity after over commutation, frequently
Rate becomes original twice.2) after the voltage after being rectified, decompression processing is carried out to the voltage, specifically, after rectification
Voltage passes through after the more a resistance of R1, R2, R3, R5, the processing of the decompression to the voltage after rectification is realized, by the voltage after decompression
As the sampled voltage of input voltage, the real-time condition of input voltage can be obtained by sampled voltage, as shown in Figure 5.Here,
Further functional descriptions are carried out to the zero cross detection circuit in Fig. 2, the partial pressure at the both ends R5 is the sampling of the input voltage
Voltage, R4 are the electric currents that current-limiting resistance limitation is input to chip, chip are protected, due to the both ends zero passage (ZEROCROSS) branch R5
Voltage detecting waveform directly influenced the size and decision process of null range, so for the accuracy and stabilization that guarantee sampling
Property has added 2 filter capacitors to the resistance R5 of the voltage sample of the branch, and an electrolytic capacitor EC1 filters out low frequency spur, and one
Capacitor C1 filters out high frequency spurs.
Step 102: it is default judge that the period arrives when, count the default zero passage for judging the voltage sample value in the period
Number；Wherein, zero passage is used to indicate position when voltage sample value reaches critical detection voltage value during changing over time.
Here, the Zero-crossing Number of the voltage sample value in the default judgement period refers to: the default judgement period pair
The Zero-crossing Number of voltage sample value in this period answered.Wherein, the corresponding period in the default judgement period are as follows: upper one
It is default to judge that cut-off time in period to current preset judges that the period arrives the moment.As an example it is assumed that it is default judge the period for T,
So, when i-th it is default judge cycle T (i) arrival when, then corresponding time period t of the default judgement period=T (i)-T (i-
1).Wherein, i is positive integer.
Here, it is described it is default judge the period for electric appliance dispatch from the factory before set a judgements time, the time can be 400 in the least
A value of the second (ms) into 1000ms.The value range of the preset threshold is determined by the default judgement period.Citing
For, it is assumed that the default judgement period takes 400ms, correspondingly, the value range of the preset threshold is [80,96]；Assuming that
The default judgement period takes 500ms, correspondingly, the value range of the preset threshold is [100,120]；Assuming that described default
Judge that the period takes 600 milliseconds, correspondingly, the value range of the preset threshold is [120,144]；And so on, it is described default
When judging the period for 700,800,900 and 1000, correspondingly, the value range of the preset threshold be respectively [140,168],
[160,192], [180,212] and [200,240].In following embodiment, the default judgement period and the preset threshold
Value range for 500ms and [100,120] respectively to be illustrated.It is worth noting that, above-mentioned default judgement period and pre-
If the value of threshold value, only illustrates, including above-mentioned data but is not limited only to above-mentioned data.
Here, the input voltage is linked into ZEROCROSS branch and is detected, and obtains voltage change as shown in Figure 5
Value and the waveform diagram of time, in figure critical detection voltage value V0 (m/nVc) be the input voltage waveform (i.e.
ZEROCROSS voltage waveform) in be arranged compare to determine whether the voltage of zero passage, by be less than or equal to V0 (m/nVc) voltage zone
The region that domain obtains after intersecting with ZEROCROSS voltage waveform is set as zero passage interruptive area, passes through the number of zero passage interruptive area
Referred to as Zero-crossing Number, as shown in figure 5, when input voltage waveform enter this region after, can carry out it is relevant to zero passage its
He operates.Wherein, the size of V0 is also to change with the voltage change of input electric appliance.
Judge in the period, once to judge the Zero-crossing Number of statistics whenever reaching default, such as sets the default judgement period
It is set to 500ms, when each timing reaches 500ms, the Zero-crossing Number of statistics is judged, and judging result is done and is grasped in next step
Make.
Specifically, the Zero-crossing Number of the voltage sample value in the statistics default judgement period, comprising: statistics is described pre-
If judging that all voltage sample values in the period occur being equal to the number of the critical detection voltage value, and the number that will be counted
The Zero-crossing Number being determined as in the default judgement period.For example, as shown in figure 5, by the voltage sample value obtained every time with
The critical detection voltage value is compared, and when the voltage value occurs being equal to the critical detection voltage value, is counted 1 time, explanation
The input voltage either initially enters or starts to be pierced by zero passage interruptive area, these statistics number we be known as zero passage
Number obtains total Zero-crossing Number, the as described default judgement when the time of statistics meeting the requirement in current default judgement period
Zero-crossing Number in period.For example, it is assumed that default judge that the period for T ', therefore, will count primary total zero passage every the time of T '
Number, when first it is default judge that the period arrives when, total Zero-crossing Number in statistics available completion [0, the T '] time, and so on, can be with
Count respectively [T ', 2T '] ..., the total Zero-crossing Number of [(n-1) T ', nT '] in the period.In China, stable electric voltage frequency is
When 50HZ, by default judgement cycle T ' is set as 500ms, then the Zero-crossing Number in [0,500] is about 100.
Further, judgement is default judges that the Zero-crossing Number in the period can also take following method: carrying out to input voltage
When sampling, obtain previous moment voltage value a and continuous later moment in time voltage value b therewith, judge voltage value a and voltage value b and
The size of critical detection voltage value；If 1) there is previous moment voltage value a more than or equal to critical detection voltage value and continuous
When later moment in time voltage value b is less than critical detection voltage value, alternatively, if previous moment voltage value a occur is greater than critical detection electricity
Pressure value and when continuous later moment in time voltage value b is less than or equal to critical detection voltage value, shows that the input voltage is in down
Drop initially enters zero passage interruptive area along process；If 2) there is previous moment voltage value a less than or equal to critical detection voltage
Value and when later moment in time voltage value b is greater than critical detection voltage value, alternatively, if there is previous moment voltage value a less than critical inspection
When surveying voltage value and later moment in time voltage value b and being greater than or equal to critical detection voltage value, show that the input voltage is in rising
Along process, and start to be pierced by zero passage interruptive area；When there is any in above-mentioned two situations, by the Zero-crossing Number original
On the basis of plus 1, that is, counted it is into and out cross null range at the time of number, i.e., described in the embodiment of the present invention
Zero-crossing Number obtains the Zero-crossing Number in 500ms when statistical time meets the regulation of current default judgement period 500ms.
Specifically, it is determined that Zero-crossing Number of the input voltage within the current default judgement period can also pass through such as lower section
Method is realized: since critical detection voltage value V0 was the upper limit voltage of null range, that is, determining to enter the critical of zero passage interruptive area
Point, and judgement enter the judgment value of zero passage interruptive area, whenever there is sampled voltage less than V0, into zero passage discontinuity area
Domain counts 1 time, does not continue to determine after entering the interrupt, when occurring sampled voltage again thereafter greater than V0, exits zero passage discontinuity area
Domain, count it is primary, statistics into zero passage interruptive area and to exit the number of zero passage interruptive area be exactly mistake described in this patent
Zero number obtains the Zero-crossing Number in 500ms when detection time meets the requirement of 500ms.
Step 103: judging whether the Zero-crossing Number is greater than preset threshold.
Further, for the working frequency of 50Hz, the period of input voltage is 20ms, and the wave period after rectification is
10ms.There are 50 periods in 500ms in this way, each period enters and exits zero passage interruptive area totally 2 times, therefore is 100 in 500ms
It is secondary.For the working frequency of 60Hz, the period of input voltage is 16.7ms, and the wave period after rectification is 8.3ms.In this way
Think there are 60 periods in 500ms, each period enters and exits zero passage interruptive area totally 2 times, therefore is 120 times in 500ms.Therefore
The judgement of difference 50HZ and 60HZ can choose the value greater than 100 less than 120 and generally stay certain surplus for the sake of assurance, can be with
Select the arbitrary number between 105~115 as frequency resulting number.
Step 104: when the Zero-crossing Number is greater than the preset threshold, determining that the frequency of the input voltage is the first work
Working frequency.
Here, for corresponding common electrical voltage use environment international at present, generally 50Hz and two kinds of 60Hz, because
This, first working frequency is 60Hz.
Specifically, when the Zero-crossing Number is greater than the preset threshold, determine that the frequency of the input voltage is 60Hz.It lifts
For example, it is assumed that the preset threshold value is 110, when the Zero-crossing Number is some value greater than 110, determines the input
The frequency of voltage is 60Hz.
Step 105: when the Zero-crossing Number is less than the preset threshold, determining that the frequency of the input voltage is the second work
Working frequency.
Here, second working frequency is 50Hz.
Specifically, when the Zero-crossing Number is less than the preset threshold, determine that the frequency of the input voltage is 50Hz.It lifts
For example, it is assumed that the preset threshold value is 110, when some value less than 110 of the Zero-crossing Number, determines that the input is electric
The frequency of pressure is 50Hz.
Further, the method also includes: based on the Zero-crossing Number in the default judgement period, determine that the input is electric
The frequency of pressure；It is display data by the frequency conversion of the input voltage and exports display.
Here, after the frequency for determining input voltage is 50Hz or 60Hz, electric appliance can be set to corresponding working frequency
Operating mode.For example, after the frequency for determining input voltage is 50Hz, the adjustable current operating mode of electric appliance is
Operating mode under 50Hz state.However, the 50Hz or 60Hz that determine here are one divided according to affiliated preset threshold
A frequency range is not necessarily the actual frequency of the input voltage for dividing operating mode.If user or manufacturer wonder
The a certain moment actual frequency of input voltage is how many when, can be calculated by the Zero-crossing Number in the current default judgement period
The actual frequency of the input voltage is obtained, to be display data by the frequency conversion of presently described input voltage and to export aobvious
Show.
Specifically, the Zero-crossing Number based in the default judgement period, obtains the actual frequency of the input voltage,
It include: the Zero-crossing Number extrapolated according to the Zero-crossing Number in the default judgement period in the unit time；By the mistake in the unit time
Quotient calculated is determined as the frequency of the input voltage divided by 2 by zero number.
Here, the unit time is 500ms.
As an example it is assumed that default judge that the period is 500ms, preset threshold 110 and determines that current default judgement is all
When the Zero-crossing Number of phase is 98, the actual frequency by calculating available present input voltage is 49Hz.It is checked in order to facilitate user
To the actual frequency of input voltage, the actual frequency 49Hz of this current moment input voltage can be converted into display data simultaneously
Output display.Here, since the preset threshold is 110, and therefore the default Zero-crossing Number judged in the period, is sentenced for 98
The frequency for determining the input voltage of current working phase is the frequency range of 50Hz, and is by the automatic adjustment of the operating mode of electric appliance
Corresponding operating mode under 50Hz frequency.Because actually at present common stable voltage power supply frequency be exactly 50Hz and
60Hz。
Further, the method also includes:, will be described when receiving the acquisition request for the frequency of the input voltage
The frequency of input voltage is sent to requesting party, so that the requesting party carries out respective handling according to the frequency of the input voltage.
To realize the above method, the embodiment of the present invention one additionally provides a kind of frequency determining device of voltage, such as Fig. 6 institute
Show, Fig. 6 is a kind of composed structure schematic diagram of the frequency determining device of voltage disclosed by the embodiments of the present invention, which includes:
Sampling module 61, counting module 62 and judgment module 63；
Sampling module 61, for obtaining voltage sample value for sampling to input voltage；
Counting module 62, for it is default judge that the period arrives when, count the default voltage sample judged in the period
The Zero-crossing Number of value；Wherein, zero passage is for when indicating that voltage sample value reaches critical detection voltage value during changing over time
Position；
Judgment module 63, for judging whether the Zero-crossing Number is greater than preset threshold；The Zero-crossing Number is greater than described default
When threshold value, determine that the frequency of the input voltage is the first working frequency；When the Zero-crossing Number is less than the preset threshold, determine
The frequency of the input voltage is the second working frequency.
Further, sampling module is specifically used for: being rectified and is depressured to input voltage；To decompression treated electricity
Pressure is sampled, and voltage sample value is obtained.
Further, the counting module 62, is specifically used for: all voltage samples in the statistics default judgement period
Value occurs being equal to the number of the critical detection voltage value, and the number counted was determined as in the default judgement period
Zero-crossing Number.
Further, described device further include: determining module 64, for based on the zero passage in the default judgement period
Number, determines the frequency of the input voltage；
Conversion module 65, for being display data by the frequency conversion of the input voltage and exporting display.
Further, the determining module 64 is also used to extrapolate list according to the Zero-crossing Number in the default judgement period
Zero-crossing Number in the time of position；By the Zero-crossing Number obtained in the unit time divided by 2, quotient calculated is determined as the input electricity
The frequency of pressure extrapolates the Zero-crossing Number in the unit time according to the Zero-crossing Number in the default judgement period.
Further, which is characterized in that described device further include: receiving module 66, for receiving for the input electricity
When the acquisition request of the frequency of pressure, sending module is triggered；
Sending module 67, for sending the frequency of the input voltage to requesting party, so that the requesting party is according to institute
The frequency for stating input voltage carries out respective handling.
By the frequency determining device for the voltage that above-mentioned module forms, following methods step can be executed:
(1) sampling module 61 samples input voltage, obtains voltage sample value.
Specifically, described to sample to input voltage, obtaining voltage sample value includes: sampling module 61 to input voltage
It is rectified and is depressured；To decompression, treated that voltage samples, and obtains voltage sample value.That is, carrying out voltage
Before sampling, rectification is carried out to input voltage and decompression is handled, and is adopted using input voltage after decompression as what will be sampled
Then sample voltage obtains voltage sample value from the sampled voltage.
Specifically, method input voltage sampled include: by zero passage sample count circuit to input voltage into
Row sampling, to obtain voltage sample value.Wherein, the composed structure of the zero passage sample count circuit is as shown in Figure 4.The electricity
Sub- electric appliance includes: electromagnetic oven, micro-wave oven and refrigerator etc..
Here, the use environment voltage of the input voltage i.e. original alternating voltage or electric appliance.Specifically, 1) electric
Device or frequency determining device rectify input voltage, the voltage after being rectified, such as Fig. 2, Fig. 3 after accessing power supply
Shown, Fig. 2 is the alternating voltage waveform schematic diagram before a kind of rectification, and Fig. 3 is the alternating voltage waveform schematic diagram after a kind of rectification；
In China, alternating current is 220 volts (V), and the original alternating voltage maximum value of access is exactly 220V, and the original alternating voltage of access is as schemed
Shown in 2.As shown in figure 4, the original alternating voltage is by two poles rectifier diode D1 and rectification in zero passage detection counting circuit
After the rectification of pipe D2, become unidirectional pulsating volage, thus the voltage after being rectified, as shown in Figure 3.It is noticeable
It is that the fluctuating range of this pulsating volage is consistent with the original alternating voltage and is to become in real time with input voltage waveform
Change, only its period becomes the half of original input AC electricity after over commutation, and frequency becomes original twice.2)
After voltage after to rectification, decompression processing is carried out to the voltage, specifically, the voltage after rectification is more by R1, R2, R3, R5
After a resistance, the processing of the decompression to the voltage after rectification is realized, using the voltage after decompression as the sampling of input voltage electricity
Pressure, the real-time condition of input voltage can be obtained by sampled voltage, as shown in Figure 5.Here, to the zero passage detection electricity in Fig. 2
Road carries out further functional descriptions, and the partial pressure at the both ends R5 is the sampled voltage of the input voltage, and R4 is current-limiting resistance limit
System is input to the electric current of chip, chip is protected, due to the direct shadow of voltage detecting waveform at the both ends zero passage (ZEROCROSS) branch R5
The size and decision process for arriving null range are rung, so for voltage sample of the Stability and veracity to the branch for guaranteeing sampling
Resistance R5 added 2 filter capacitors, an electrolytic capacitor EC1 filters out low frequency spur, and a capacitor C1 filters out high frequency spurs.
(2) counting module 62 it is default judge that the period arrives when, count the default voltage sample value judged in the period
Zero-crossing Number, judge whether the Zero-crossing Number is greater than preset threshold；Wherein, zero passage is for indicating that voltage sample value is becoming at any time
Reach position when critical detection voltage value during changing.
Here, the Zero-crossing Number of the voltage sample value in the default judgement period refers to: the default judgement period pair
The Zero-crossing Number of voltage sample value in this period answered.Wherein, the corresponding period in the default judgement period are as follows: upper one
It is default to judge that cut-off time in period to current preset judges that the period arrives the moment.As an example it is assumed that it is default judge the period for T,
So, when i-th it is default judge cycle T (i) arrival when, then corresponding time period t of the default judgement period=T (i)-T (i-
1).Wherein, i is positive integer.
Here, it is described it is default judge the period for electric appliance dispatch from the factory before set a judgements time, the time can be 400 in the least
A value of the second (ms) into 1000ms.The value range of the preset threshold is determined by the default judgement period.Citing
For, it is assumed that the default judgement period takes 400ms, correspondingly, the value range of the preset threshold is [80,96]；Assuming that
The default judgement period takes 500ms, correspondingly, the value range of the preset threshold is [100,120]；Assuming that described default
Judge that the period takes 600 milliseconds, correspondingly, the value range of the preset threshold is [120,144]；And so on, it is described default
When judging the period for 700,800,900 and 1000, correspondingly, the value range of the preset threshold be respectively [140,168],
[160,192], [180,212] and [200,240].In following embodiment, the default judgement period and the preset threshold
Value range for 500ms and [100,120] respectively to be illustrated.It is worth noting that, above-mentioned default judgement period and pre-
If the value of threshold value, only illustrates, including above-mentioned data but is not limited only to above-mentioned data.
Here, the input voltage is linked into ZEROCROSS branch and is detected, and obtains voltage change as shown in Figure 5
Value and the waveform diagram of time, in figure critical detection voltage value V0 (m/nVc) be the input voltage waveform (i.e.
ZEROCROSS voltage waveform) in be arranged compare to determine whether the voltage of zero passage, by be less than or equal to V0 (m/nVc) voltage zone
Domain intersects the region obtained with ZEROCROSS voltage waveform and is set as zero passage interruptive area, is claimed by the number of zero passage interruptive area
Be Zero-crossing Number, as shown in figure 5, after the waveform of input voltage is into this region, can carry out it is relevant to zero passage other
Operation.Wherein, the size of V0 is also to change with the voltage change of input electric appliance.
Judge in the period, once to judge the Zero-crossing Number of statistics whenever reaching default, such as sets the default judgement period
It is set to 500ms, when each timing reaches 500ms, the Zero-crossing Number of statistics is judged, and judging result is done and is grasped in next step
Make.
Specifically, counting module 62 counts the Zero-crossing Number of the voltage sample value in the default judgement period, comprising: counts
All voltage sample values that module 62 counted in the default judgement period occur being equal to the number of the critical detection voltage value,
And the number counted is determined as the Zero-crossing Number in the default judgement period.For example, as shown in figure 5, by obtaining every time
The voltage sample value taken is compared with the critical detection voltage value, when the voltage value occurs being equal to the critical detection voltage value
When, it counts 1 time, illustrates that the input voltage either initially enters or starts to be pierced by zero passage interruptive area, the number of these statistics
We are known as Zero-crossing Number, when the time of statistics meeting the requirement in current default judgement period, obtain total Zero-crossing Number, i.e.,
For the Zero-crossing Number in the default judgement period.For example, it is assumed that default judge that the period for T ', therefore, will unite every the time of T '
The primary total Zero-crossing Number of meter counts total Zero-crossing Number in [0, the T '] time, when first, which is preset, judges that the period arrives with such
It pushes away, can calculate separately out [T ', 2T '] ..., the total Zero-crossing Number of [(n-1) T ', nT '] in the period.In China, stable electricity
Voltage-frequency rate is 50HZ, by default judgement cycle T ' when being set as 500ms, then the Zero-crossing Number in [0,500] is about 100.
Further, judgement is default judges that the Zero-crossing Number in the period can also take following method: carrying out to input voltage
When sampling, obtain previous moment voltage value a and continuous later moment in time voltage value b therewith, judge voltage value a and voltage value b and
The size of critical detection voltage value；If 1) there is previous moment voltage value a more than or equal to critical detection voltage value and continuous
When later moment in time voltage value b is less than critical detection voltage value, alternatively, if previous moment voltage value a occur is greater than critical detection electricity
Pressure value and when continuous later moment in time voltage value b is less than or equal to critical detection voltage value, shows that the input voltage is in down
Drop initially enters zero passage interruptive area along process；If 2) there is previous moment voltage value a less than or equal to critical detection voltage
Value and when later moment in time voltage value b is greater than critical detection voltage value, alternatively, if there is previous moment voltage value a less than critical inspection
When surveying voltage value and later moment in time voltage value b and being greater than or equal to critical detection voltage value, show that the input voltage is in rising
Along process, and start to be pierced by zero passage interruptive area；When there is any in above-mentioned two situations, by the Zero-crossing Number original
On the basis of plus 1, that is, counted it is into and out cross null range at the time of number, i.e., described in the embodiment of the present invention
Zero-crossing Number obtains the Zero-crossing Number in 500ms when statistical time meets the regulation of current default judgement period 500ms.
Specifically, counting module 62 calculate Zero-crossing Number of the input voltage within the current default judgement period can also be with
It realizes by the following method: since critical detection voltage value V0 was the upper limit voltage of null range, that is, determining that entering zero passage interrupts
The critical point in region, and judgement enter the judgment value of zero passage interruptive area, whenever there is sampled voltage less than V0, enter
Zero interruptive area counts 1 time, does not continue to determine after entering the interrupt, when occurring sampled voltage again thereafter greater than V0, exits
Zero interruptive area, count it is primary, statistics into zero passage interruptive area and to exit the number of zero passage interruptive area be exactly this patent
The Zero-crossing Number obtains the Zero-crossing Number in 500ms when detection time meets the requirement of 500ms.
(3) judgment module 63 judges whether the Zero-crossing Number is greater than preset threshold；The Zero-crossing Number is greater than the default threshold
When value, determine that the frequency of the input voltage is the first working frequency；When the Zero-crossing Number is less than the preset threshold, institute is determined
The frequency for stating input voltage is the second working frequency.
Here, for corresponding common electrical voltage use environment international at present, generally 50Hz and two kinds of 60Hz, because
This, first working frequency is 60Hz；Second working frequency is 50Hz.
Further, for the working frequency of 50Hz, the period of input voltage is 20ms, and the wave period after rectification is
10ms.There are 50 periods in 500ms in this way, each period enters and exits zero passage interruptive area totally 2 times, therefore is 100 in 500ms
It is secondary.For the working frequency of 60Hz, the period of input voltage is 16.7ms, and the wave period after rectification is 8.3ms.In this way
Think there are 60 periods in 500ms, each period enters and exits zero passage interruptive area totally 2 times, therefore is 120 times in 500ms.Therefore
The judgement of difference 50HZ and 60HZ can choose the value greater than 100 less than 120 and generally stay certain surplus for the sake of assurance, can be with
Select the arbitrary number between 105~115 as frequency resulting number.
Specifically, when judgment module 63 judges that the Zero-crossing Number is greater than the preset threshold, the input voltage is determined
Frequency is 60Hz.As an example it is assumed that the preset threshold value is 110, judgment module 63 judges that the Zero-crossing Number is big
When 110 some value, determine that the frequency of the input voltage is 60Hz.
Specifically, when judgment module 63 judges that the Zero-crossing Number is less than the preset threshold, the input voltage is determined
Frequency is 50Hz.As an example it is assumed that the preset threshold value is 110, judgment module 63 judges that the Zero-crossing Number is less than
When 110 some value, determine that the frequency of the input voltage is 50Hz.
Further, it is determined that module 64 determines the input voltage based on the Zero-crossing Number in the default judgement period
Frequency；The frequency conversion of the input voltage is display data and exports display by conversion module 65.
Here, after determining module 64 determines that the frequency of input voltage is 50Hz or 60Hz, electric appliance can be set to correspond to
The operating mode of working frequency.For example, after the frequency for determining input voltage is 50Hz, the adjustable current work of electric appliance
Operation mode is the operating mode under 50Hz state.However, the 50Hz or 60Hz that determine here are according to affiliated preset threshold
The frequency range divided is not necessarily the actual frequency of the input voltage for dividing operating mode.If user or factory
Quotient wonders a certain moment actual frequency of input voltage is how many when, can pass through the zero passage in the current default judgement period
Number calculates the actual frequency for obtaining presently described input voltage, to be display by the frequency conversion of presently described input voltage
Data simultaneously export display.
Specifically, the Zero-crossing Number based in the default judgement period, obtains the actual frequency of the input voltage,
Comprise determining that module 64 extrapolates the Zero-crossing Number in the unit time according to the Zero-crossing Number in the default judgement period；By unit
Quotient calculated is determined as the frequency of the input voltage divided by 2 by the Zero-crossing Number in the time.
Here, the unit time is 500ms.
As an example it is assumed that default judge that the period is 500ms, preset threshold 110 and determines that current default judgement is all
When the Zero-crossing Number of phase is 98, the actual frequency by calculating acquisition present input voltage is 49Hz.It is viewed in order to facilitate user
The actual frequency 49Hz of this current moment input voltage can be converted to display data and defeated by the actual frequency of input voltage
It shows out.Here, since the preset threshold is 110, and the default Zero-crossing Number judged in the period is 98, therefore, judgement
The frequency of the input voltage of current working phase is the frequency range of 50Hz, and the operating mode of electric appliance is automatically adjusted as 50Hz
Corresponding operating mode under frequency.Because actually stable voltage power supply frequency common at present is exactly 50Hz and 60Hz.
Further, the acquisition for the frequency of the input voltage is received the method also includes: receiving module 66 to ask
When asking, sending module 67 is triggered；Sending module 67 sends the frequency of the input voltage to requesting party, for the requesting party
Respective handling is carried out according to the frequency of the input voltage.
Technical solution through the embodiment of the present invention, by carrying out rectification and decompression processing, real-time monitoring to input voltage
Sampled voltage situation after decompression calculates the frequency for obtaining input voltage by the Zero-crossing Number of sampled voltage.If the Zero-crossing Number is small
When preset threshold, determine that the frequency is 50Hz；If the Zero-crossing Number is greater than preset threshold, determine that the frequency is 60Hz；According to
The working frequency of frequency correction electric appliance after variation, so that it is guaranteed that electric appliance remains to normally when the frequency for accessing voltage changes
And stable work.
Embodiment two
Fig. 7 is a kind of implementation process schematic diagram of the frequency determination methods of voltage disclosed in the embodiment of the present invention two, reference
Shown in Fig. 7, the frequency determination methods of the voltage of the present embodiment the following steps are included:
Step 701: real-time sampling being carried out to input voltage, obtains the sampled voltage waveform of input voltage；
Step 702: whether the voltage value of real-time judge sampling is being crossed in null range；
Here, as shown in figure 5, by the fluctuation voltage of the sampled voltage of voltage regime and input voltage less than or equal to V0
The region of intersection was used as null range.Shadow region in such as figure between t ' and t ".Each periodic waveform has 2 parts at this
In a shadow region, i.e., there are two being partially in null range, therefore each cycle count 2 times are used as Zero-crossing Number.
Step 703: the number of cycles in statistics preset time 500ms；
Step 704: by number of cycles multiplied by 2 as the Zero-crossing Number within preset time 500ms；
Step 705: whether timing expires 500ms；
Judge whether the time for counting Zero-crossing Number meets the default regulation for judging period 500ms, whenever meeting 500ms,
Execute step 707.
Step 706: entering other programs；
Step 707: frequency being called to determine subprogram；
Step 708: judging that Zero-crossing Number N is greater than preset threshold Na?
Step 709: if Zero-crossing Number N is less than Na, input voltage being determined as 50Hz, at this point, electric appliance is adjustable current
Operating mode be 50Hz state under operating mode；
Step 710: if Zero-crossing Number N is greater than Na, input voltage being determined as 60Hz, at this point, electric appliance is adjustable current
Operating mode be 60Hz state under operating mode；
Step 711: clear Zero-crossing Number N=0；
Step 712: returning to principal function.
Technical solution through the embodiment of the present invention is carried out at rectification and decompression by the input voltage to access electric appliance
Reason, and monitor the voltage after decompression in real time, using the voltage as the sampled voltage of input voltage, utilize the sampling electricity of input voltage
The Zero-crossing Number of pressure calculates the frequency for obtaining input voltage, if the Zero-crossing Number is less than preset threshold, determines that the frequency is 50Hz；If
When the Zero-crossing Number is greater than preset threshold, determine that the frequency is 60Hz；According to the working frequency of the frequency correction electric appliance after variation, from
And ensures electric appliance and remain to normal and stable work when the frequency for accessing voltage changes.
Embodiment three
Fig. 8 is a kind of implementation process schematic diagram of the frequency determination methods of voltage disclosed in the embodiment of the present invention three, reference
Shown in Fig. 8, the frequency determination methods of the voltage of the present embodiment the following steps are included:
Step 801: real-time sampling is carried out to input voltage；
Does is step 802: the voltage value of real-time judgment sampling equal to V0?
Step 803: when the voltage value of sampling is not equal to V0, Zero-crossing Number N is not added 1；
Step 804: when the voltage value of sampling is equal to V0, Zero-crossing Number N+1；
Step 805: whether timing expires 500ms；
Judge whether the time for counting Zero-crossing Number meets the default regulation for judging period 500ms, whenever meeting 500ms,
Execute step 807.
Step 806: entering other programs；
Step 807: frequency being called to determine subprogram；
Step 808: calculating the frequency F=N/2 of input voltage；
The frequency F is the real-time detection value of input voltage, and the first working frequency 60Hz and the second working frequency 50Hz
It is common and common electrical work environmental frequencies.
Step 809: F is passed into the operation and control that other programs do corresponding frequencies；
Step 810: F is transmitted to display module；
Step 811: clear Zero-crossing Number N=0；
Step 812: returning to principal function.
Technical solution through the embodiment of the present invention, by being carried out at rectification and decompression to the original alternating voltage of access
Reason, and monitor the sampled voltage after decompression in real time, the frequency of input voltage is calculated and obtained using the Zero-crossing Number of sampled voltage, if
When the Zero-crossing Number is less than preset threshold, determine that the frequency is 50Hz；If the Zero-crossing Number is greater than preset threshold, determine that the frequency is
60Hz；Operating mode can be set according to the constant interval of frequency, and according to the work of the frequency real time correction electric appliance after variation
Mode, so that it is guaranteed that electric appliance remains to normal and stable work when the frequency for accessing voltage changes；Further, it is also possible to will
The frequency F of input voltage carries out output and shows, and frequency F is passed to other components or program does the control of corresponding frequencies
System.
In practical application, the sampling module 61, counting module 62, judgment module 63, determining module 64 and conversion module
65 can by be located at (CPU, the Central ProcessingUnit) of frequency determining device of voltage, microprocessor (MPU,
Microprocessor Unit), digital signal processor (DSP, DigitalSignal Processor) or field-programmable
Gate array (FPGA, Field-Programmable Gate Array) etc. is realized；The receiving module 66 and sending module 67 by
Communication interface in the frequency determining device of voltage etc. is realized.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.It is all
Made any modifications, equivalent replacements, and improvements etc. within the spirit and scope of the present invention is all contained in protection model of the invention
Within enclosing.
Claims (12)
1. a kind of frequency determination methods of voltage, which is characterized in that the described method includes:
Input voltage is sampled, voltage sample value is obtained；
It is default judge that the period arrives when, the default Zero-crossing Number for judging the voltage sample value in the period is counted, described in judgement
Whether Zero-crossing Number is greater than preset threshold；Wherein, zero passage is for indicating that voltage sample value reaches critical during changing over time
Detect position when voltage value；
When the Zero-crossing Number is greater than the preset threshold, determine that the frequency of the input voltage is the first working frequency；
When the Zero-crossing Number is less than the preset threshold, determine that the frequency of the input voltage is the second working frequency.
2. obtaining voltage sample the method according to claim 1, wherein described sample input voltage
Value includes:
Input voltage is rectified and is depressured；
To decompression, treated that voltage samples, and obtains voltage sample value.
3. according to the method described in claim 2, it is characterized in that, the statistics default voltage sample judged in the period
The Zero-crossing Number of value, comprising:
All voltage sample values in the default judgement period are counted to occur being equal to the number of the critical detection voltage value, and
The number counted is determined as the Zero-crossing Number in the default judgement period.
4. the method according to claim 1, wherein the method also includes:
Based on the Zero-crossing Number in the default judgement period, the frequency of the input voltage is determined；
It is display data by the frequency conversion of the input voltage and exports display.
5. according to the method described in claim 4, it is characterized in that, it is described based on it is described it is default judgement the period in Zero-crossing Number,
Determine the frequency of the input voltage, comprising:
The Zero-crossing Number in the unit time is extrapolated according to the Zero-crossing Number in the default judgement period；
By the Zero-crossing Number in the unit time divided by 2, quotient calculated is determined as to the frequency of the input voltage.
6. method according to claim 4 or 5, which is characterized in that the method also includes:
When receiving the acquisition request for the frequency of the input voltage, the frequency of the input voltage is sent to requesting party,
So that the requesting party carries out respective handling according to the frequency of the input voltage.
7. a kind of frequency determining device of voltage, which is characterized in that described device includes:
Sampling module obtains voltage sample value for sampling to input voltage；
Counting module, for it is default judge that the period arrives when, count the default mistake for judging the voltage sample value in the period
Zero number；Wherein, zero passage is used to indicate position when voltage sample value reaches critical detection voltage value during changing over time；
Judgment module, for judging whether the Zero-crossing Number is greater than preset threshold；When the Zero-crossing Number is greater than the preset threshold,
The frequency for determining the input voltage is the first working frequency；When the Zero-crossing Number is less than the preset threshold, determine described defeated
The frequency for entering voltage is the second working frequency.
8. device according to claim 7, which is characterized in that the sampling module is specifically used for:
Input voltage is rectified and is depressured；
To decompression, treated that voltage samples, and obtains voltage sample value.
9. device according to claim 8, which is characterized in that the counting module is specifically used for:
All voltage sample values in the default judgement period are counted to occur being equal to the number of the critical detection voltage value, and
The number counted is determined as the Zero-crossing Number in the default judgement period.
10. device according to claim 7, which is characterized in that described device further include:
Determining module, for determining the frequency of the input voltage based on the Zero-crossing Number in the default judgement period；
Conversion module, for being display data by the frequency conversion of the input voltage and exporting display.
11. device according to claim 10, which is characterized in that the determining module is also used to be sentenced according to described preset
Zero-crossing Number in the disconnected period extrapolates the Zero-crossing Number in the unit time；It, will be calculated by the Zero-crossing Number in the unit time divided by 2
Quotient is determined as the frequency of the input voltage.
12. device described in 0 or 11 according to claim 1, which is characterized in that described device further include:
Receiving module triggers sending module when for receiving the acquisition request for being directed to the frequency of the input voltage；
Sending module, for sending the frequency of the input voltage to requesting party, so that the requesting party is according to the input
The frequency of voltage carries out respective handling.
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| CN110470903A (en) * | 2019-07-31 | 2019-11-19 | 山东建筑大学 | A kind of electric voltage frequency hard measurement device and method |
| CN111368677A (en) * | 2020-02-26 | 2020-07-03 | 国网上海市电力公司 | Target detection and identification method for improving zero-crossing number analysis |
| CN112305328A (en) * | 2020-09-14 | 2021-02-02 | 珠海格力电器股份有限公司 | Power supply phase loss detection method and device, storage medium and electric appliance |
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