CN113529347A - Alternating current power supply frequency detection method and device and clothes treatment system - Google Patents

Alternating current power supply frequency detection method and device and clothes treatment system Download PDF

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CN113529347A
CN113529347A CN202010300883.3A CN202010300883A CN113529347A CN 113529347 A CN113529347 A CN 113529347A CN 202010300883 A CN202010300883 A CN 202010300883A CN 113529347 A CN113529347 A CN 113529347A
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frequency
power supply
period
zero
level
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CN113529347B (en
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刘桃
高秋英
郇政杰
田颖
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Qingdao Jiaonan Haier Washing Machine Co Ltd
Haier Smart Home Co Ltd
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Qingdao Jiaonan Haier Washing Machine Co Ltd
Haier Smart Home Co Ltd
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/04—Signal transfer or data transmission arrangements
    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/44—Current or voltage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)

Abstract

The invention relates to the technical field of signal processing, particularly provides a method and a device for detecting the frequency of an alternating current power supply and a clothes processing system, and aims to solve the technical problem of accurately detecting the frequency of the alternating current power supply. The invention acquires the first level value of the output signal of the zero-crossing detection circuit of the alternating current power supply and the number of the first level values of which the level value is smaller than the level threshold value in each period of time in each frequency detection period, and if the number is larger than the upper limit value of the number threshold value, the second level value corresponding to the period of time is set to be zero, which is equivalent to simplifying all low-level signals into a low-level signal, eliminating the influence of other low-level signals on voltage zero-crossing detection and frequency calculation, so that the frequency of the alternating current power supply can be accurately calculated under the condition that the voltage of the alternating current power supply fluctuates. Furthermore, an alarm signal can be output when the frequency of the alternating current power supply is continuously too low or too high, so that a user is reminded to check the alternating current power supply or stop using equipment accessed to the alternating current power supply.

Description

Alternating current power supply frequency detection method and device and clothes treatment system
Technical Field
The invention relates to the technical field of signal processing, in particular to a method and a device for detecting the frequency of an alternating current power supply and a clothes processing system.
Background
The frequency of the ac power source refers to the number of times the ac power changes periodically per unit time (e.g., 1 s). At present, the conventional method for detecting the frequency of the alternating current power supply is to acquire the number of voltage zero crossings within a certain detection time duration, and determine the power supply frequency (such as 50Hz or 60Hz) according to the number of the voltage zero crossings. However, when the voltage of the alternating current power supply fluctuates, the number of voltage zero crossings in the detection time length may be abnormal, and if the power supply frequency is continuously determined according to the number of voltage zero crossings, a frequency value with a larger deviation with the actual power supply frequency is obtained.
Accordingly, there is a need in the art for a new ac power frequency detection scheme to solve the above problems.
Disclosure of Invention
In order to overcome the above-mentioned drawbacks, the present invention is proposed to provide a power frequency detection method, a device and a laundry treatment system that solve or at least partially solve the problem of how to accurately detect the frequency of an ac power.
In a first aspect, a method for detecting a frequency of an ac power supply is provided, the method including:
dividing a preset frequency detection cycle into a plurality of main time periods with equal time length and dividing each main time period into a plurality of sub time periods with equal time length according to the sequence of time from first to last;
respectively acquiring first level values of output signals of a zero-crossing detection circuit of the alternating-current power supply in each sub-period, and acquiring the number of the first level values of which the level values corresponding to each main period are smaller than a preset level threshold;
acquiring a second level value corresponding to each main time period according to the number of the first level values corresponding to each main time period and a preset number threshold;
respectively judging whether the second level value corresponding to each main time interval and the previous main time interval is equal or not; if the second level value corresponding to the current main time interval and the previous main time interval is not equal, adding 1 to the current zero-crossing jump times; if the second level value corresponding to the current main time interval and the previous main time interval is equal, controlling the current zero-crossing jump frequency to be kept unchanged;
and acquiring a final zero-crossing jump frequency value after respectively judging whether the second level value corresponding to each main time interval and the previous main time interval is equal, and calculating the alternating current power supply frequency in the preset frequency detection period according to the final zero-crossing jump frequency value.
The step of obtaining the second level value corresponding to each main time period according to the number of the first level values corresponding to each main time period and a preset number threshold specifically includes:
if it is
Figure BDA0002453931820000022
Then VL2_n0; if it is
Figure BDA0002453931820000025
Then VL 2_n1 is ═ 1; if it is
Figure BDA0002453931820000023
Then VL2_n＝VL2_n-1(ii) a Said N isdAnd NuRespectively, a lower limit value and an upper limit value of the preset number threshold value, the
Figure BDA0002453931820000024
Is the first level value VL corresponding to the nth main period in the preset frequency detection cycle1_nNumber of (2), the VL2_nIs a second level value corresponding to an nth main period in the preset frequency detection cycle, the VL2_n-1Is the second level value corresponding to the (n-1) th main period in the preset frequency detection period.
The step of calculating the ac power frequency within the preset frequency detection period according to the final value of the zero-crossing frequency specifically includes:
the ac power frequency is calculated according to the method shown in the following equation:
Figure BDA0002453931820000021
said FPIs the frequency of the AC power supply, NzeroIs the final value of the zero-crossing transition times, and M is the number of voltage zero-crossings of the ac power source within one ac cycle of the ac power source.
Wherein the method further comprises: selecting a plurality of continuous frequency detection periods and acquiring the alternating current power supply frequency corresponding to each frequency detection period; judging whether the frequency of each alternating current power supply is smaller than a preset frequency lower limit value or larger than a preset frequency upper limit value; if yes, an alarm signal is output.
In a second aspect, an apparatus for detecting a frequency of an ac power supply is provided, the apparatus including:
the frequency detection cycle processing module is configured to divide a preset frequency detection cycle into a plurality of main time periods with equal time length and divide each main time period into a plurality of sub time periods with equal time length according to the sequence of time from first to last;
a first level value obtaining module configured to obtain first level values of output signals of a zero-crossing detection circuit of the ac power supply in each sub-period, respectively, and obtain the number of the first level values whose level values respectively correspond to each main period are smaller than a preset level threshold;
a second level value obtaining module configured to obtain a second level value corresponding to each main time period according to the number of the first level values corresponding to each main time period and a preset number threshold;
a zero-crossing transition number processing module configured to respectively judge whether the second level value corresponding to each main period and the last main period is equal; if the second level value corresponding to the current main time interval and the previous main time interval is not equal, adding 1 to the current zero-crossing jump times; if the second level value corresponding to the current main time interval and the previous main time interval is equal, controlling the current zero-crossing jump frequency to be kept unchanged;
an ac power frequency calculation module configured to acquire a final value of the zero-crossing transition number after respectively determining whether the second level value corresponding to each main period and the previous main period is equal to each other, and calculate an ac power frequency within the preset frequency detection period according to the final value of the zero-crossing transition number.
Wherein the second level value obtaining module is configured to perform the following operations:
if it is
Figure BDA0002453931820000035
Then VL2_n0; if it is
Figure BDA0002453931820000031
Then VL 2_n1 is ═ 1; if it is
Figure BDA0002453931820000032
Then VL2_n＝VL2_n-1(ii) a Said N isdAnd NuRespectively, a lower limit value and an upper limit value of the preset number threshold value, the
Figure BDA0002453931820000033
Is the first level value VL corresponding to the nth main period in the preset frequency detection cycle1_nNumber of (2), the VL2_nIs a second level value corresponding to an nth main period in the preset frequency detection cycle, the VL2_n-1Is the second level value corresponding to the (n-1) th main period in the preset frequency detection period.
Wherein the power frequency calculation module is configured to perform the following operations:
the ac power frequency is calculated according to the method shown in the following equation:
Figure BDA0002453931820000034
said FPIs the frequency of the AC power supply, NzeroIs the final value of the zero-crossing transition times, and M is the number of voltage zero-crossings of the ac power source within one ac cycle of the ac power source.
Wherein the apparatus further comprises an alarm module configured to:
selecting a plurality of continuous frequency detection periods and acquiring the alternating current power supply frequency corresponding to each frequency detection period;
judging whether the frequency of each alternating current power supply is smaller than a preset frequency lower limit value or larger than a preset frequency upper limit value; if yes, an alarm signal is output.
In a third aspect, a clothes treatment system is provided, which comprises a clothes treatment device, a control device and the ac power frequency detection device of any one of the above, wherein the control device and the ac power frequency detection device are arranged on the clothes treatment device;
the alternating current power supply frequency detection device is configured to detect a power supply frequency of an alternating current power supply accessed by the clothes treatment equipment and send the power supply frequency to the control device;
the control device is configured to obtain a corresponding clothes treatment mode according to the power supply frequency based on a corresponding relation between a preset frequency and the clothes treatment mode, and control the clothes treatment equipment to operate according to the obtained clothes treatment mode.
In a fourth aspect, a clothes treatment system is provided, which includes a clothes treatment device, a terminal device, a background server and the ac power frequency detection device of any one of the above, wherein the ac power frequency detection device is disposed on the clothes treatment device;
the alternating current power supply frequency detection device is configured to detect a power supply frequency of an alternating current power supply accessed by the clothes treatment equipment and send the power supply frequency to the background server;
the background server is configured to obtain one or more corresponding clothes treatment modes according to the power supply frequency and based on the corresponding relation between the preset frequency and the clothes treatment modes, and send the obtained clothes treatment modes to the terminal equipment for display, so that a user can select and set the clothes treatment modes of the clothes treatment equipment according to the display information of the terminal equipment.
One or more technical schemes of the invention at least have one or more of the following beneficial effects:
in the technical scheme for implementing the invention, a first level value of an output signal of a zero-crossing detection circuit of the alternating-current power supply is acquired in each frequency detection cycle sharing period, the number of the first level values of which the level values are smaller than a preset level threshold value in each period is acquired, and if the number is larger than a preset number threshold value upper limit value, a second level value VL2 corresponding to the period is setnAnd (0) simplifying all low-level signals in the period into one low-level signal, thereby eliminating the influence of the rest low-level signals on subsequent voltage zero-crossing detection and alternating-current power supply frequency calculation, and accurately calculating the frequency of the alternating-current power supply under the condition that the alternating-current power supply has voltage fluctuation. After the second level value corresponding to each time interval is obtained, whether the second level value corresponding to the current time interval and the second level value corresponding to the previous time interval are equal or not is judged, if yes, the zero-crossing frequency is subjected to plus 1 processing, and finally the alternating current power supply frequency is calculated according to the final result of the zero-crossing frequency.
Further, if the frequency of the alternating current power supply is smaller than the preset frequency lower limit value or larger than the preset frequency upper limit value in a plurality of continuous frequency detection periods, which indicates that the frequency of the alternating current power supply is too small or too large due to abnormal fluctuation of the alternating current power supply in the period of time, an alarm signal can be output to remind a user to check the alternating current power supply or stop using equipment such as a washing machine accessed to the alternating current power supply.
Drawings
Embodiments of the invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a schematic flow chart of the main steps of a method for detecting the frequency of an AC power source according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the main structure of a zero-crossing detection circuit of an AC power supply according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a main structure of an ac power supply frequency detection apparatus according to an embodiment of the present invention;
fig. 4 is a schematic view of the main structure of a laundry washing system according to an embodiment of the present invention;
fig. 5 is a schematic view of a main structure of a laundry washing system according to another embodiment of the present invention;
list of reference numerals:
1: an alternating current power supply frequency detection device; 11: a frequency detection period processing module; 12: a first level value obtaining module; 13; a second level value obtaining module; 14: a zero-crossing jump number processing module; 15: an alternating current power supply frequency calculation module; 2: a control device; 3: a laundry treating apparatus; 4: a background server; 5: and (4) terminal equipment.
Detailed Description
Some embodiments of the present invention will be described below with reference to the accompanying drawings in conjunction with a washing machine. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, "module", "control apparatus", "server", "terminal device" may include hardware, software, or a combination of both. A module may comprise hardware circuitry, various suitable sensors, communication ports, memory, may comprise software components such as program code, or may be a combination of software and hardware. The term "a and/or B" denotes all possible combinations of a and B, such as a alone, B alone or a and B. The term "at least one A or B" or "at least one of A and B" means similar to "A and/or B" and may include only A, only B, or both A and B. The singular forms "a", "an" and "the" may include the plural forms as well.
When the clothes treatment equipment such as the washing machine uses the alternating current power supplies with different frequencies (such as 50Hz or 60Hz) for power supply, the motor rotating speed of the washing machine is different, and the clothes load and the washing water quantity which can be driven by different motor rotating speeds are different, so that the clothes washing effect of the washing machine is different when the alternating current power supplies with different frequencies are used, in order to ensure that the washing machine has good washing effect when the alternating current power supplies with different frequencies are used, the power supply frequency of the alternating current power supplies needs to be accurately detected, and then the washing mode of the washing machine is adaptively adjusted according to the power supply frequency (the washing mode comprises but is not limited to the motor rotating speed, the washing water quantity, the rotating mode of a washing barrel/drum and the like). The conventional alternating current power supply frequency detection method comprises the steps of obtaining the number of voltage zero crossings in a certain detection time length and determining the power supply frequency according to the number of the voltage zero crossings. For example: the frequency of the sinusoidal ac power source is 50Hz if 100 voltage zero crossings are detected within 1 second. However, in practical application, the alternating current power supply may jitter near the voltage zero crossing due to voltage fluctuation and the like, so that the alternating current power supply may have multiple zero crossings near the voltage zero crossing, and if the power supply frequency is determined according to the number of the voltage zero crossings, a frequency value having a large deviation from the actual power supply frequency may be obtained. For example: the number of voltage zero crossings in 1 second of a sinusoidal ac power source with a frequency of 50Hz is 100, whereas 120 voltage zero crossings may be detected in 1 second when a voltage fluctuation occurs, the frequency of which is 60Hz if the power source frequency is determined from the number of detected voltage zero crossings.
In the embodiment of the invention, the first level value of the output signal of the zero-crossing detection circuit of the alternating current power supply is acquired in the equally divided period (such as 1ms) in each frequency detection period (such as 1s), and the first power with the level value smaller than the preset level threshold value in each period is acquiredThe number of the flat values is larger than the upper limit value of the preset number threshold value, and the second level value VL2 corresponding to the time period is setnAnd (0) simplifying all low-level signals in the period into one low-level signal, thereby eliminating the influence of the rest low-level signals on subsequent voltage zero-crossing detection and alternating-current power supply frequency calculation, and accurately calculating the frequency of the alternating-current power supply under the condition that the alternating-current power supply has voltage fluctuation. After the second level value corresponding to each time interval is obtained, whether the second level value corresponding to the current time interval and the second level value corresponding to the previous time interval are equal or not is judged, if yes, the zero-crossing frequency is subjected to plus 1 processing, and finally the alternating current power supply frequency is calculated according to the final result of the zero-crossing frequency. Further, if the frequency of the alternating current power supply is smaller than the preset frequency lower limit value or larger than the preset frequency upper limit value in a plurality of continuous frequency detection periods, which indicates that the frequency of the power supply is too small or too large due to abnormal fluctuation of the alternating current power supply in the period of time, an electric alarm signal can be output to remind a user to check the alternating current power supply or stop using equipment such as a washing machine accessed to the alternating current power supply.
Referring to fig. 1, fig. 1 is a flow chart illustrating main steps of a method for detecting a frequency of an ac power according to an embodiment of the present invention. As shown in fig. 1, the method for detecting the frequency of the ac power supply in the embodiment of the present invention mainly includes the following steps:
step S101: dividing a preset frequency detection cycle into a plurality of main time periods with equal time length and dividing each main time period into a plurality of sub time periods with equal time length according to the sequence of time from first to last.
In this embodiment, the preset frequency detection period, the main period duration and the sub-period duration may be set according to actual requirements. An example is as follows: the preset frequency detection period is 1 second, the duration of the main time period is 1 millisecond, the duration of the sub time period is 100 microseconds, and the main time period { T } can be obtained by dividing the preset frequency detection period according to the time sequence from first to last1,T2,…,T1000For a main period T1The sub-period { T ] can be obtained after division11,T12,…,T110}。
Step S102: and respectively acquiring first level values of output signals of the zero-crossing detection circuit of the alternating current power supply in each sub-period, and acquiring the number of the first level values of which the level values corresponding to each main period are smaller than a preset level threshold.
The zero-cross detection circuit refers to a circuit for detecting a voltage zero-cross of an alternating-current power supply, which refers to a voltage potential of the alternating-current power supply when positive and negative voltage polarities of the alternating-current power supply alternate (change from positive to negative or from negative to positive). The zero-crossing detection circuit can output a high-level voltage signal when the voltage is not zero and output a low-level voltage signal (such as a voltage signal with zero level) when the voltage is zero, and whether the voltage zero crossing occurs can be detected through the high-level and low-level changes of the output signal. In one embodiment, the zero crossing detection circuit shown in fig. 2 may be used, and as shown in fig. 2, the zero crossing detection circuit includes resistors R1-R5, a diode D, a capacitor C, and a transistor Q. The alternating current power supply is connected to the end N1, the resistors R1-R2 limit the alternating current, the alternating voltage is limited within 5V, the triode Q is conducted when the capacitor voltage of the capacitor C is larger than the conducting voltage of the triode Q, and the output end ZERO CROSS DET of the ZERO-crossing detection circuit outputs a voltage signal of + 5V. When the capacitor voltage of the capacitor C is smaller than the conduction voltage of the triode Q, the triode Q is cut off, and the ZERO CROSS DET of the ZERO-crossing detection circuit outputs a voltage signal of 0V.
It is noted that although the present invention provides only an embodiment of the zero crossing detection circuit shown in fig. 3, it is easily understood by those skilled in the art that the protection scope of the present invention is obviously not limited to this embodiment. Without departing from the principle of the present invention, a person skilled in the art can use zero-crossing detection circuits with other circuit structures, and such modifications or substitutions will fall within the scope of the present invention
Step S103: and acquiring a second level value corresponding to each main time period according to the number of the first level values corresponding to each main time period and a preset number threshold.
In this embodiment, the second level value corresponding to each master period may be obtained according to the following steps:
if it is
Figure BDA0002453931820000081
Then VL2_n0; if it is
Figure BDA0002453931820000082
Then VL 2_n1 is ═ 1; if it is
Figure BDA0002453931820000083
Then VL2_n＝VL2_n-1；NdAnd NuRespectively a lower limit value and an upper limit value of a preset quantity threshold value,
Figure BDA0002453931820000084
is a first level value VL corresponding to the nth main period in a preset frequency detection cycle1_nNumber of (2), VL2_nIs a second level value, VL, corresponding to the nth main period in the preset frequency detection cycle2_n-1Is a second level value corresponding to the (n-1) th master period in the preset frequency detection period. An example is as follows: n is a radical ofd＝2，Nu＝8。
In practical application, multiple zero-crossing phenomena of the alternating current power supply near the voltage zero-crossing can be caused due to voltage fluctuation and the like
Figure BDA0002453931820000085
The time indicates that the zero-cross detection circuit outputs a plurality of low level signals in the vicinity of the zero-cross of the voltage due to voltage fluctuation, in which case the second level VL corresponding to the nth main period is set2_n0, it is equivalent to reduce all low level signals of the main period to one low level signal, so as to eliminate the influence of the rest low level signals on the determination of whether the voltage zero crossing is detected in the subsequent step S104, and further eliminate the influence on the calculation of the frequency of the ac power supply in the subsequent step S105, so that the frequency of the ac power supply can be accurately calculated even when the voltage fluctuation occurs in the ac power supply.
Step S104: and respectively judging whether the second level value corresponding to each main time interval and the previous main time interval is equal or not, and adjusting the zero-crossing jump times according to the judgment result. Specifically, if the second level value corresponding to the current main period is not equal to the second level value corresponding to the previous main period, it indicates that a level jump (from a low level to a high level or from a high level to a low level) has occurred in the current main period, and when it is determined that the level jump has occurred, the current zero-crossing jump number is obtained and the zero-crossing jump number is subjected to plus-1 processing. If the second level value corresponding to the current main time interval and the previous main time interval is equal, it indicates that no level jump occurs in the current main time interval relative to the previous main time interval, and it is sufficient that the zero-crossing jump frequency is controlled to be kept unchanged without performing the processing of adding 1 to the zero-crossing jump frequency.
An example is as follows: assume zero crossing number of transitions NzeroIs 0, and divides a preset frequency detection period into 5 main periods { T } in time order from first to last1,T2,…,T5}. Firstly, the second level values corresponding to the 5 main time periods are sequentially 0, 1, 0 and 1 through the steps S101 to S103, then whether the second level value corresponding to each main time period is equal to the second level value corresponding to the previous main time period is judged according to the following steps, and the zero-crossing jump frequency is adjusted according to the judgment result:
step 1: judgment of T2And T1Whether the corresponding second level values are equal or not, due to T2And T1If the corresponding second level values are not equal, the zero jump times N are determinedzeroBy adding 1, i.e. zero number of transitions Nzero＝0+1＝1。
Step 2: judgment of T3And T2Whether the corresponding second level values are equal or not, due to T3And T2If the corresponding second level values are not equal, the zero jump times N obtained in step 1 are obtainedzeroBy adding 1, i.e. zero number of transitions Nzero＝1+1＝2。
And step 3: judgment of T4And T3Whether the corresponding second level values are equal or not, due to T4And T3If the corresponding second level values are equal, controlling the zero jump times N obtained in step 2zeroRemaining unchanged, i.e. zero number of transitions Nzero＝2。
And 4, step 4: judgment of T5And T4Whether the corresponding second level values are equal or not, due to T5And T4If the corresponding second level values are not equal, the zero jump times N obtained in step 3 are obtainedzeroBy adding 1, i.e. zero number of transitions N zero2+ 1-3, i.e. zero transition number NzeroAnd 3 is the adjusted final value of the zero-crossing transition times.
Step S105: and acquiring the adjusted final value of the zero-crossing jump times, and calculating the alternating current power supply frequency in a preset frequency detection period according to the final value of the zero-crossing jump times. The adjusted final value of the zero-crossing transition number refers to a final value of the zero-crossing transition number obtained after respectively judging whether the second level value corresponding to each main period is equal to the previous main period in step S104.
In the present embodiment, the ac power frequency can be calculated by the method shown in the following equation (1):
Figure BDA0002453931820000091
the meaning of each parameter in the formula (1) is: fPIs the frequency of the AC power supply, NzeroIs the final value of the zero-crossing transition times, and M is the number of zero-crossings of the voltage of the ac power supply within one ac cycle of the ac power supply. An example is as follows: if the ac power supply is a sinusoidal ac power supply, M is 2.
Through the steps S101 to S105, a preset frequency detection period, such as the frequency of the ac power supply within 1 second, can be obtained, and according to the frequency detection results of a plurality of consecutive frequency detection periods, the present invention can further determine whether the ac power supply has abnormal fluctuation. Specifically, in the embodiment of the present invention, whether the ac power supply has abnormal fluctuation may be determined according to the following steps:
step 1: and selecting a plurality of continuous frequency detection periods and acquiring the alternating current power supply frequency corresponding to each frequency detection period. An example is as follows: and selecting 6 th to 10 th frequency detection periods according to the sequence of time from first to last and acquiring the alternating current power supply frequency corresponding to each of the 5 frequency detection periods. The ac power frequency corresponding to each frequency detection cycle is obtained by the method described in steps S101 to S105.
Step 2: and (3) judging whether each alternating current power supply frequency obtained in the step (1) is smaller than a preset frequency lower limit value or larger than a preset frequency upper limit value. If each alternating current power supply frequency is smaller than the preset frequency lower limit value or each alternating current power supply frequency is larger than the preset frequency upper limit value, the fact that the power supply frequency is too small or too large due to abnormal fluctuation of the alternating current power supply in the period of time is shown, and therefore an alarm signal can be output to remind a user of checking the alternating current power supply or stopping using the equipment accessed to the alternating current power supply.
It should be noted that, although the foregoing embodiments describe each step in a specific sequence, those skilled in the art will understand that, in order to achieve the effect of the present invention, different steps do not necessarily need to be executed in such a sequence, and they may be executed simultaneously (in parallel) or in other sequences, and these changes are all within the protection scope of the present invention.
In another embodiment of the present invention, an ac power frequency detection apparatus is provided, and referring to fig. 3, fig. 3 is a schematic diagram of a main structure of an ac power frequency detection apparatus according to an embodiment of the present invention. As shown in fig. 3, the ac power frequency detection apparatus in the embodiment of the present invention mainly includes a frequency detection period processing module 11, a first level value obtaining module 12, a second level value obtaining module 13, a zero-crossing frequency processing module 14, and an ac power frequency calculating module 15. In some embodiments, one or more of the frequency detection period processing module 11, the first level value obtaining module 12, the second level value obtaining module 13, the zero-cross transition number processing module 14, and the ac power frequency calculating module 15 may be combined together into one module. The frequency detection cycle processing module 11 may be configured to divide the preset frequency detection cycle into a plurality of main periods of equal duration and divide each main period into a plurality of sub-periods of equal duration in time order from first to last. The first level value obtaining module 12 may be configured to obtain the first level values of the output signals of the zero-crossing detection circuit of the ac power supply in each sub-period, and obtain the number of the first level values whose level values corresponding to each main period are smaller than a preset level threshold. The second level value obtaining module 13 may be configured to obtain the second level value corresponding to each main period according to the number of the first level values corresponding to each main period and a preset number threshold. The zero-crossing transition number processing module 14 may be configured to respectively determine whether the second level value corresponding to each master period and the previous master period is equal; if the second level value corresponding to the current main time interval and the previous main time interval is not equal, adding 1 to the current zero-crossing jump times; and if the second level value corresponding to the current main time interval and the previous main time interval is equal, controlling the current zero-crossing jump frequency to be kept unchanged. The ac power frequency calculation module 15 may be configured to acquire a final value of the zero-crossing transition number after respectively determining whether the second level value corresponding to each main period and the last main period thereof is equal, and calculate the ac power frequency within a preset frequency detection period according to the final value of the zero-crossing transition number. In one embodiment, the description of the specific implementation function may be referred to in steps S101 to S105.
In one embodiment, the second level value obtaining module 13 is configured to perform the following operations: if it is
Figure BDA0002453931820000111
Then VL2_n0; if it is
Figure BDA0002453931820000112
Then VL 2_n1 is ═ 1; if it is
Figure BDA0002453931820000113
Figure BDA0002453931820000114
Then VL2_n＝VL2_n-1；NdAnd NuRespectively a lower limit value and an upper limit value of a preset quantity threshold value,
Figure BDA0002453931820000115
is a first level value VL corresponding to the nth main period in a preset frequency detection cycle1_nNumber of (2), VL2_nIs a second level value, VL, corresponding to the nth main period in the preset frequency detection cycle2_n-1Is a second level value corresponding to the (n-1) th master period in the preset frequency detection period. In one embodiment, the description of the specific implementation function may be referred to in step S103.
In one embodiment, the power frequency calculation module is configured to calculate the ac power frequency according to the method shown in equation (1). In one embodiment, the description of the specific implementation function may be referred to in step S105.
In one embodiment, the ac power frequency detection apparatus shown in fig. 3 may further include an alarm module configured to perform the following operations: selecting a plurality of continuous frequency detection periods and acquiring the alternating current power supply frequency corresponding to each frequency detection period; judging whether the frequency of each alternating current power supply is smaller than a preset frequency lower limit value or larger than a preset frequency upper limit value; if yes, an alarm signal is output.
The technical principles, the solved technical problems and the generated technical effects of the above-mentioned ac power frequency detection apparatus for implementing the embodiment of the ac power frequency detection method shown in fig. 1 are similar, and it can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working process and related descriptions of the ac power frequency detection apparatus may refer to the contents described in the embodiment of the ac power frequency detection method, and are not repeated herein.
In still another embodiment of the present invention, a laundry treating system is provided. Referring to fig. 4, fig. 4 is a schematic view of a main structure of a laundry treating system according to an embodiment of the present invention. As shown in fig. 4, the clothes treatment system in this embodiment comprises an ac power frequency detection device 1, a control device 2 and a clothes treatment apparatus 3 according to the above-mentioned ac power frequency detection device embodiment. The control device 2 and the alternating current power supply frequency detection device 1 are both arranged on the clothes treatment equipment. In the present embodiment, the ac power frequency detection device 1 may be configured to detect the power frequency of the ac power accessed by the laundry treatment apparatus 3 and send the power frequency to the control device 2. The control device 2 may be configured to obtain a corresponding laundry treatment mode based on a correspondence between a preset frequency and the laundry treatment mode and according to the power supply frequency, and control the operation of the laundry treatment apparatus 3 according to the obtained laundry treatment mode. The laundry treating apparatus 3 includes, but is not limited to, a washing machine, a laundry dryer, a laundry washer-dryer, and the like.
As can be seen from the foregoing embodiments, when the laundry processing apparatus, such as a washing machine, is powered by ac power sources with different frequencies (e.g. 50Hz or 60Hz), the motor rotation speed of the washing machine will be different, and the load and the amount of washing water that can be driven by different motor rotation speeds will be different, so that the laundry washing effect of the washing machine will be different when ac power sources with different frequencies are used, and in order to ensure that the washing machine can have better washing effect when ac power sources with different frequencies are used, the washing mode of the washing machine needs to be adaptively adjusted according to the power frequency, while in this embodiment, a corresponding laundry processing mode can be set according to different power frequencies, and then "the corresponding relationship between the preset frequency and the laundry processing mode" is established according to the laundry processing mode corresponding to each power frequency, and when the power frequency of the ac power source connected to the laundry processing apparatus 3 is detected, the corresponding laundry can be directly matched according to the corresponding relationship And (4) managing the mode.
In yet another embodiment of the present invention, a laundry treating system is provided. Referring to fig. 5, fig. 5 is a schematic view of a main structure of a laundry treating system according to an embodiment of the present invention. As shown in fig. 5, the clothes treatment system in this embodiment includes the ac power frequency detection device 1, the backend server 4, the terminal device 5, and the clothes treatment device (not shown in fig. 5) according to the above-mentioned ac power frequency detection device embodiment, and the ac power frequency detection device 1 is disposed on the clothes treatment device. In the embodiment, the ac power frequency detecting device 1 may be configured to detect a power frequency of an ac power accessed by the laundry treatment apparatus and transmit the power frequency to the background server 4, and the station server 4 may be configured to obtain one or more corresponding laundry treatment modes based on a preset correspondence between the frequency and the laundry treatment modes and according to the power frequency, and transmit the obtained laundry treatment modes to the terminal apparatus for display, so that a user can select and set the laundry treatment mode of the laundry treatment apparatus according to display information of the terminal apparatus 5. Laundry treatment apparatuses include, but are not limited to, washing machines, laundry dryers, laundry washers, and the like.
The background server 4 refers to a server capable of performing communication interaction with the terminal device 5. The terminal device 5 may be a device provided on the clothes treatment device, or may be a user terminal device (such as a computer, a mobile phone, or a tablet computer).
In this embodiment, one or more corresponding laundry treatment modes may be set according to different power frequencies, then a "correspondence between a preset frequency and a laundry treatment mode" is constructed according to one or more laundry treatment modes corresponding to each power frequency, and when the power frequency of the ac power source connected to the laundry treatment apparatus is detected, the corresponding laundry treatment mode may be directly matched according to the correspondence, so as to control the laundry treatment apparatus to operate according to the matched laundry treatment mode.
It will be understood by those skilled in the art that all or part of the flow of the method according to the above-described embodiment may be implemented by a computer program, which may be stored in a computer-readable storage medium and used to implement the steps of the above-described embodiments of the method when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying said computer program code, media, usb disk, removable hard disk, magnetic diskette, optical disk, computer memory, read-only memory, random access memory, electrical carrier wave signals, telecommunication signals, software distribution media, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
Further, it should be understood that, since the modules are only configured to illustrate the functional units of the system of the present invention, the corresponding physical devices of the modules may be the processor itself, or a part of software, a part of hardware, or a part of a combination of software and hardware in the processor. Thus, the number of individual modules in the figures is merely illustrative.
Those skilled in the art will appreciate that the various modules in the system may be adaptively split or combined. Such splitting or combining of specific modules does not cause the technical solutions to deviate from the principle of the present invention, and therefore, the technical solutions after splitting or combining will fall within the protection scope of the present invention.
According to the embodiment of the invention, the first level value of the output signal of the zero-crossing detection circuit of the alternating current power supply is acquired in each frequency detection period sharing time interval, the number of the first level values of which the level values are smaller than the preset level threshold value in each time interval is acquired, and if the number is larger than the upper limit value of the preset number threshold value, the second level value VL2 corresponding to the time interval is setnAnd (0) equivalently, all the low-level signals in the period are simplified into one low-level signal, so that the influence of the rest low-level signals on subsequent voltage zero-crossing detection and alternating-current power supply frequency calculation is eliminated, and the frequency of the alternating-current power supply can be accurately calculated even if the alternating-current power supply generates voltage fluctuation. And after the second level value corresponding to each time interval is obtained, judging whether the second level value corresponding to the current time interval and the second level value corresponding to the previous time interval are equal, if so, adding 1 to the zero-crossing frequency, and finally calculating the frequency of the alternating current power supply according to the final result of the zero-crossing frequency. Further, if in a plurality of consecutiveThe frequency of the alternating current power supply in the frequency detection period is smaller than the preset lower frequency limit value or larger than the preset upper frequency limit value, which indicates that the power supply frequency is too small or too large due to abnormal fluctuation of the alternating current power supply in the period of time, and an alarm signal can be output to remind a user to check the alternating current power supply or stop using equipment such as a washing machine accessed to the alternating current power supply.
So far, the technical solution of the present invention has been described with reference to one embodiment shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. An alternating current power supply frequency detection method, characterized in that the method comprises:
dividing a preset frequency detection cycle into a plurality of main time periods with equal time length and dividing each main time period into a plurality of sub time periods with equal time length according to the sequence of time from first to last;
respectively acquiring first level values of output signals of a zero-crossing detection circuit of the alternating-current power supply in each sub-period, and acquiring the number of the first level values of which the level values corresponding to each main period are smaller than a preset level threshold;
acquiring a second level value corresponding to each main time period according to the number of the first level values corresponding to each main time period and a preset number threshold;
respectively judging whether the second level value corresponding to each main time interval and the previous main time interval is equal or not; if the second level value corresponding to the current main time interval and the previous main time interval is not equal, adding 1 to the current zero-crossing jump times; if the second level value corresponding to the current main time interval and the previous main time interval is equal, controlling the current zero-crossing jump frequency to be kept unchanged;
and acquiring a final zero-crossing jump frequency value after respectively judging whether the second level value corresponding to each main time interval and the previous main time interval is equal, and calculating the alternating current power supply frequency in the preset frequency detection period according to the final zero-crossing jump frequency value.
2. The ac power frequency detection method according to claim 1, wherein the step of obtaining the second level value corresponding to each of the main periods according to the number of the first level values corresponding to each of the main periods and a preset number threshold specifically comprises:
if it is
Figure FDA0002453931810000011
Then VL2_n＝0；
If it is
Figure FDA0002453931810000012
Then VL2_n＝1；
If it is
Figure FDA0002453931810000013
Then VL2_n＝VL2_n-1；
Wherein, the N isdAnd NuRespectively, a lower limit value and an upper limit value of the preset number threshold value, the
Figure FDA0002453931810000014
Is the first level value VL corresponding to the nth main period in the preset frequency detection cycle1_nNumber of (2), the VL2_nIs a second level value corresponding to an nth main period in the preset frequency detection cycle, the VL2_n-1Is the second level value corresponding to the (n-1) th main period in the preset frequency detection period.
3. The ac power frequency detection method according to claim 1, wherein the step of calculating the ac power frequency within the preset frequency detection period according to the final value of the zero-crossing transition number specifically comprises:
the ac power frequency is calculated according to the method shown in the following equation:
Figure FDA0002453931810000021
wherein, F isPIs the frequency of the AC power supply, NzeroIs the final value of the zero-crossing transition times, and M is the number of voltage zero-crossings of the ac power source within one ac cycle of the ac power source.
4. The ac power frequency detection method according to claim 1, further comprising:
selecting a plurality of continuous frequency detection periods and acquiring the alternating current power supply frequency corresponding to each frequency detection period;
judging whether the frequency of each alternating current power supply is smaller than a preset frequency lower limit value or larger than a preset frequency upper limit value; if yes, an alarm signal is output.
5. An apparatus for detecting a frequency of an ac power supply, the apparatus comprising:
the frequency detection cycle processing module is configured to divide a preset frequency detection cycle into a plurality of main time periods with equal time length and divide each main time period into a plurality of sub time periods with equal time length according to the sequence of time from first to last;
a first level value obtaining module configured to obtain first level values of output signals of a zero-crossing detection circuit of the ac power supply in each sub-period, respectively, and obtain the number of the first level values whose level values respectively correspond to each main period are smaller than a preset level threshold;
a second level value obtaining module configured to obtain a second level value corresponding to each main time period according to the number of the first level values corresponding to each main time period and a preset number threshold;
a zero-crossing transition number processing module configured to respectively judge whether the second level value corresponding to each main period and the last main period is equal; if the second level value corresponding to the current main time interval and the previous main time interval is not equal, adding 1 to the current zero-crossing jump times; if the second level value corresponding to the current main time interval and the previous main time interval is equal, controlling the current zero-crossing jump frequency to be kept unchanged;
an ac power frequency calculation module configured to acquire a final value of the zero-crossing transition number after respectively determining whether the second level value corresponding to each main period and the previous main period is equal to each other, and calculate an ac power frequency within the preset frequency detection period according to the final value of the zero-crossing transition number.
6. The ac power frequency detection apparatus according to claim 5, further comprising said second level value obtaining module configured to:
if it is
Figure FDA0002453931810000031
Then VL2_n＝0；
If it is
Figure FDA0002453931810000032
Then VL2_n＝1；
If it is
Figure FDA0002453931810000033
Then VL2_n＝VL2_n-1；
Wherein, the N isdAnd NuRespectively, a lower limit value and an upper limit value of the preset number threshold value, the
Figure FDA0002453931810000034
Is the first level value VL corresponding to the nth main period in the preset frequency detection cycle1_nNumber of (2), the VL2_nIs the preset frequencyDetecting a second level value corresponding to an nth main period within the cycle, the VL2_n-1Is the second level value corresponding to the (n-1) th main period in the preset frequency detection period.
7. The ac power frequency detection device of claim 5, further comprising the power frequency calculation module configured to:
the ac power frequency is calculated according to the method shown in the following equation:
Figure FDA0002453931810000035
wherein, F isPIs the frequency of the AC power supply, NzeroIs the final value of the zero-crossing transition times, and M is the number of voltage zero-crossings of the ac power source within one ac cycle of the ac power source.
8. The ac power frequency detection apparatus of claim 5, further comprising an alarm module configured to:
selecting a plurality of continuous frequency detection periods and acquiring the alternating current power supply frequency corresponding to each frequency detection period;
judging whether the frequency of each alternating current power supply is smaller than a preset frequency lower limit value or larger than a preset frequency upper limit value; if yes, an alarm signal is output.
9. A laundry processing system, characterized in that the laundry processing system comprises a laundry processing apparatus, a control device and the ac power frequency detection device of any one of claims 5 to 8, the control device and the ac power frequency detection device being provided on the laundry processing apparatus;
the alternating current power supply frequency detection device is configured to detect a power supply frequency of an alternating current power supply accessed by the clothes treatment equipment and send the power supply frequency to the control device;
the control device is configured to obtain a corresponding clothes treatment mode according to the power supply frequency based on a corresponding relation between a preset frequency and the clothes treatment mode, and control the clothes treatment equipment to operate according to the obtained clothes treatment mode.
10. A clothes treatment system, characterized in that the clothes treatment system comprises a clothes treatment device, a terminal device, a background server and the alternating current power supply frequency detection device of any one of claims 5 to 8, wherein the alternating current power supply frequency detection device is arranged on the clothes treatment device;
the alternating current power supply frequency detection device is configured to detect a power supply frequency of an alternating current power supply accessed by the clothes treatment equipment and send the power supply frequency to the background server;
the background server is configured to obtain one or more corresponding clothes treatment modes according to the power supply frequency and based on the corresponding relation between the preset frequency and the clothes treatment modes, and send the obtained clothes treatment modes to the terminal equipment for display, so that a user can select and set the clothes treatment modes of the clothes treatment equipment according to the display information of the terminal equipment.
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