CN113685997B - Control method of air conditioner compressor and air conditioner - Google Patents

Control method of air conditioner compressor and air conditioner Download PDF

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Publication number
CN113685997B
CN113685997B CN202010421487.6A CN202010421487A CN113685997B CN 113685997 B CN113685997 B CN 113685997B CN 202010421487 A CN202010421487 A CN 202010421487A CN 113685997 B CN113685997 B CN 113685997B
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electrolytic capacitor
energy loss
preset time
value
current
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CN113685997A (en
Inventor
徐贝贝
高保华
刘聚科
张新
赵晓明
史为品
刘娟
吕兴宇
曹壬艳
郭丽
程永甫
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Haier Smart Home Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/60—Energy consumption
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention provides a control method of an air conditioner compressor and an air conditioner, wherein the air conditioner comprises a PFC circuit and an electrolytic capacitor connected with the output end of the PFC circuit in parallel, and the control method comprises the following steps: acquiring the total operating current of the air conditioner, and calculating the energy loss value of the electrolytic capacitor in a preset time interval according to the total operating current; acquiring the energy loss accumulated value of the current electrolytic capacitor, and accumulating the energy loss value of the electrolytic capacitor in a preset time interval into the energy loss accumulated value of the electrolytic capacitor; judging whether the accumulated energy loss value of the electrolytic capacitor is larger than a preset energy loss threshold value or not; if so, reducing the operating frequency of the compressor; if not, the compressor keeps the previous running frequency running. The control method provided by the invention can adjust the running frequency of the compressor in real time based on the energy loss of the electrolytic capacitor, realizes the reduction of the internal temperature of the electrolytic capacitor, delays the evaporation speed of the electrolyte, prolongs the service life of the electrolytic capacitor and has strong practicability.

Description

Control method of air conditioner compressor and air conditioner
Technical Field
The invention relates to the field of air conditioners, in particular to a control method of an air conditioner compressor and an air conditioner.
Background
With the increasing living standard of people, the position of the air conditioner in the field of household appliances becomes more important. The electrolytic capacitor for the air conditioner is an important element in a circuit system, and the service life of the electrolytic capacitor is a main index for measuring the quality of the air conditioner. The lifetime of the electrolytic capacitor is found to be related to the temperature, and the higher the temperature is, the faster the electrolyte inside the electrolytic capacitor evaporates, and the shorter the lifetime is.
In order to prevent the electrolytic capacitor from being damaged due to overhigh temperature, some control methods exist in the prior art, and the current is directly used as a reference object to regulate and control the frequency of a compressor, so that the purpose of regulating and controlling the temperature of the electrolytic capacitor is achieved. However, these methods have certain disadvantages, for example, the current is only one of the conditions causing the electrolytic capacitor to generate heat, and the temperature of the electrolytic capacitor is regulated and controlled only by using the current as a reference object, which may cause a phenomenon of low regulation precision, even ineffective regulation, and low practicability.
Disclosure of Invention
The present invention has been made in view of the above problems, and has an object to provide a control method of an air conditioner compressor and an air conditioner that overcome or at least partially solve the above problems to optimize the effects.
A further object of the present invention is to precisely adjust the frequency of the compressor to reduce the internal temperature of the electrolytic capacitor and extend the life of the electrolytic capacitor.
It is another further object of the present invention to enhance the user experience.
Particularly, the application provides a control method of an air conditioner compressor, wherein the air conditioner comprises a PFC circuit and an electrolytic capacitor connected with the output end of the PFC circuit in parallel; and, the control method includes:
acquiring the total operating current of the air conditioner, and calculating the energy loss value of the electrolytic capacitor within a preset time interval according to the total operating current;
acquiring the current energy loss accumulated value of the electrolytic capacitor, and accumulating the energy loss value of the electrolytic capacitor in the preset time interval into the energy loss accumulated value of the electrolytic capacitor; and
judging whether the accumulated energy loss value of the electrolytic capacitor is larger than a preset energy loss threshold value or not;
if so, reducing the operating frequency of the compressor;
if not, the compressor keeps the previous running frequency running.
Further, the control method further includes:
acquiring the current moment; and
judging whether the current moment is a preset moment in a preset time period or not;
and if not, clearing the stored energy loss accumulated value of the electrolytic capacitor.
Further, the step of calculating the energy loss value of the electrolytic capacitor within a preset time interval according to the total operating current further comprises:
periodically collecting the running total current at the preset time interval;
calculating the corresponding ripple current of the electrolytic capacitor according to the running total current; and
calculating the energy loss value of the electrolytic capacitor within a preset time interval according to the following formula:
Q＝(I ripple (n) 2 -I ripple (n-1) 2 )×Re×Δt
wherein Q is the energy loss value of the electrolytic capacitor in a preset time interval, I ripple (n) and I ripple (n-1) ripple currents of the electrolytic capacitor at the nth time and the nth-1 time respectively, re is an equivalent resistance of the electrolytic capacitor, and delta t is the preset time interval.
Further, the step of calculating the energy loss value of the electrolytic capacitor in the preset time period according to the total current further comprises:
periodically collecting the running total current at the preset time interval;
calculating the corresponding ripple current of the electrolytic capacitor according to the running total current;
establishing a relational expression between the ripple current of the electrolytic capacitor and the time within the preset time period; and
calculating the energy loss value of the electrolytic capacitor within a preset time interval according to the following formula:
Figure BDA0002497140500000021
wherein Q is the energy loss value of the electrolytic capacitor in a preset time interval, I ripple And (2) the ripple current of the electrolytic capacitor, re is the equivalent resistance of the electrolytic capacitor, and n-1 are two moments with the difference of the preset time interval respectively.
Further, the preset energy loss threshold value is any value selected from the range of 10KJ to 20 KJ.
Further, the preset time period is 1 or more days.
Further, the step of reducing the operating frequency of the compressor further comprises:
and determining the reduction proportion of the operating frequency of the compressor according to the proportion of the accumulated energy loss value of the electrolytic capacitor exceeding the energy loss threshold value.
Further, the reduction ratio is proportional to a ratio at which an accumulated energy loss value of the electrolytic capacitor exceeds the energy loss threshold.
Further, the accumulated energy loss value of the electrolytic capacitor is stored in a storage of the air conditioner; and/or
And the data is stored in a cloud database through a Wi-Fi module.
In particular, the present application also provides an air conditioner comprising:
a controller comprising a memory and a processor, the memory having stored therein a computer program for implementing the above control method when executed by the processor.
The control method of the invention selects the energy loss value of the electrolytic capacitor as the regulating quantity based on the nature of the heating of the electrolytic capacitor, and achieves the purpose of reducing the energy loss of the electrolytic capacitor by regulating the frequency of the compressor, thereby realizing the reduction of the internal temperature of the electrolytic capacitor, delaying the evaporation speed of the electrolyte and prolonging the service life of the electrolytic capacitor.
Furthermore, the control method in the invention clears the stored energy loss accumulated value of the electrolytic capacitor periodically, thereby not only meeting the real-time regulation and control of the internal temperature of the electrolytic capacitor, but also avoiding that the frequency of the compressor can not reach the previous operating frequency continuously and can not reach the preset refrigeration or heating temperature when the energy loss accumulated value of the electrolytic capacitor exceeds the preset energy threshold value, and improving the user experience.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an air conditioner according to another embodiment of the present invention;
FIG. 3 is a schematic flow chart diagram of a control method according to one embodiment of the present invention;
FIG. 4 is a schematic flow chart diagram of a control method for calculating an energy loss value of an electrolytic capacitor over a preset time interval according to one embodiment of the present invention;
fig. 5 is a schematic flow chart of a control method for calculating an energy loss value of an electrolytic capacitor within a preset time interval according to another embodiment of the present invention.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention. The present application provides an air conditioner 1, generally including a compressor 10 for compressing a refrigerant, a four-way valve 20 for switching a flow direction of the refrigerant in a refrigeration system of the air conditioner 1, an indoor heat exchanger 30 for exchanging heat with indoor air, a double pipe heat exchanger 40 having inner and outer pipes (an inner pipe 41 and an outer pipe 42), an expansion valve 50 for throttling the refrigerant, and an outdoor heat exchanger 60 for exchanging heat with outdoor air. Further, the air conditioner 1 may further include an indoor fan 31 for circulating indoor air inside and outside the indoor unit of the air conditioning device, a heating device 32 for heating the coil of the indoor heat exchanger 30, and an outdoor fan 61 for circulating outdoor air inside and outside the outdoor unit of the air conditioning device. An accumulator 11 may be further disposed at the refrigerant inlet of the compressor 10, so that the returned refrigerant flows into the accumulator 11 and then enters the compressor 10.
The Power supply circuit of the air conditioner 1 further includes a rectifier circuit, a PFC (Power Factor Correction) circuit, an electrolytic capacitor connected in parallel to an output end of the PFC circuit, and the like. The electrolytic capacitor is used as an important electrical element in a circuit system, and the service life of the electrolytic capacitor is a main index for measuring the quality of the air conditioner. The lifetime of the electrolytic capacitor is found to be related to the temperature, and the higher the temperature is, the faster the electrolyte inside the electrolytic capacitor evaporates, and the shorter the lifetime is.
As mentioned in the background art, the method of the prior art that uses the air conditioning current as a reference object to control the frequency of the compressor, and thus regulate the temperature of the electrolytic capacitor may have the phenomena of low regulation precision and even ineffective regulation.
Referring to fig. 2 and 3, fig. 2 is a schematic structural schematic diagram of an air conditioner according to another embodiment of the present invention, and fig. 3 is a schematic flowchart of a control method according to an embodiment of the present invention. In some embodiments of the present application, the air conditioner 1 further comprises a controller 70, the controller 70 comprises a storage 72 and a processor 74, a computer program 722 is stored in the storage 72, and the computer program 722 is used for implementing a control method of the air conditioner compressor when being executed by the processor 74. The method utilizes the energy loss accumulation according to the electrolytic capacitor as a reference object, accurately regulates and controls the frequency of the compressor 10, and achieves the purpose of reducing the surface temperature of the electrolytic capacitor. And the method comprises the steps of:
step S110, acquiring the total operating current of the air conditioner 1, and calculating the energy loss value of the electrolytic capacitor in a preset time interval according to the total operating current;
step S120, acquiring the energy loss accumulated value of the current electrolytic capacitor, and accumulating the energy loss value of the electrolytic capacitor in a preset time interval into the energy loss accumulated value of the electrolytic capacitor; and
step S130, judging whether the energy loss accumulated value of the electrolytic capacitor is larger than a preset energy loss threshold value or not;
step S132, if yes, reducing the operating frequency of the compressor 10;
in step S134, if not, the compressor 10 keeps the previous operation frequency.
In this embodiment, after the air conditioner is started, step 110 may detect and obtain the total current of the air conditioner by using a current detection device, and calculate the energy loss value of the electrolytic capacitor in a preset time interval. And step 120, accumulating the recorded energy loss accumulated value of the electrolytic capacitor before and the energy loss value of the electrolytic capacitor in a preset time interval to obtain the final energy loss accumulated value of the electrolytic capacitor. Step S130 compares the accumulated energy loss value of the electrolytic capacitor with a preset energy loss threshold value. Specifically, when the accumulated value of the energy loss of the electrolytic capacitor is greater than the preset energy loss threshold value, it is determined that the energy loss generated by the electrolytic capacitor has reached the energy loss limit, and the energy loss of the electrolytic capacitor is reduced by reducing the variable frequency current of the air conditioner, that is, by reducing the frequency of the compressor 10. When the accumulated energy loss value of the electrolytic capacitor does not reach the preset energy loss threshold value, the energy loss generated by the electrolytic capacitor is considered to be small, and the frequency of the compressor 10 does not need to be adjusted. The control method of the invention judges whether the primary energy loss limit of the electrolytic capacitor is reached according to whether the accumulated value of the energy loss of the electrolytic capacitor reaches the preset energy loss threshold value, if so, the energy loss of the electrolytic capacitor is reduced by reducing the running frequency of the compressor 10.
In some specific embodiments of the present application, the current detection device in step 110 may be a current sensor. The current sensor is a detection device which can sense the information of the current to be detected and convert the detected information into an electric signal meeting certain standard requirements or information in other required forms according to a certain rule and output the electric signal or the information in other required forms so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like. Of course, those skilled in the art may also adopt other forms of alternative detection devices or detection circuits after knowing the technical solution of the present application, and the present application is not limited to this.
In some embodiments of the present application, the predetermined energy loss threshold is any value selected from the range of 10KJ to 20 KJ. Those skilled in the art can configure the preset energy loss threshold value to 10KJ, 12KJ, 15KJ, 18KJ, 20KJ, or the like according to the working conditions of the air conditioner 1, such as power, specification of the electrolytic capacitor, and the like, and the specific value of the preset energy loss threshold value in the range is not particularly limited in the present application.
The control method of the electrolytic capacitor energy loss control system selects the electrolytic capacitor energy loss value as the regulating variable based on the heating nature of the electrolytic capacitor, and achieves the purpose of reducing the energy loss of the electrolytic capacitor by regulating the frequency of the compressor 10, thereby reducing the internal temperature of the electrolytic capacitor, delaying the evaporation speed of electrolyte and prolonging the service life of the electrolytic capacitor.
In some embodiments of the present application, the control method further comprises the steps of:
acquiring the current moment; and
judging whether the current moment is a preset moment in a preset time period or not;
and if not, clearing the stored energy loss accumulated value of the electrolytic capacitor.
Specifically, the control method may acquire the current time recorded in the air conditioner timing device, for example, the current time is 10/5/12/2020: 30. year 2020, 5 month, 20 days 12: 00. year 2030, 3 month 1 day 15: 45. 7/2025/30/00: 00, etc. If the current time belongs to the preset time period, the energy loss value of the electrolytic capacitor needs to be accumulated and calculated. And if the current time does not belong to the preset time period and the accumulation in the preset time period is considered to be finished, executing the zero clearing of the stored energy loss accumulated value of the electrolytic capacitor, and accumulating the energy loss value from zero.
In some specific embodiments of the present application, the preset time period may be configured to be 1 day, and the preset time period start time may be set to any time, for example, the preset time period start time is set to 00: time 00, namely the preset time period of the day is 00:00 to 24: the 00 time period. After the air conditioner is started, each preset time interval can generate certain energy loss, and along with the lapse of the starting time of the air conditioner, the energy loss value is continuously accumulated, if 19: and at the time of 00, if the accumulated energy loss value is greater than the preset energy loss threshold value, executing to reduce the operating frequency of the compressor 10. Until 24 on the day: and 00, clearing the energy loss accumulated value, starting the next preset time period, and continuously circulating in sequence.
In other embodiments of the present application, the preset time period may be configured to be multiple days, and the start time of the preset time period may be configured to be any time, such as 01:00, and so on.
In other embodiments of the present application, the air conditioner may also change the preset time period and the start time of the preset time period in a big data self-learning manner according to the usage habit, seasonal variation, and other parameters of the user. For example, if the time when the user uses the air conditioner is concentrated in the evening and the early morning, the preset time period may be set to 1 day, and the start time of the preset time period may be set at 18:00.
referring to fig. 4, in some embodiments of the present application, the step of calculating the energy loss value of the electrolytic capacitor within the preset time interval according to the total operating current further includes:
step S210, periodically collecting total running current at preset time intervals;
step S220, calculating the ripple current of the corresponding electrolytic capacitor according to the total operating current; and
step S230, calculating the energy loss value of the electrolytic capacitor within a preset time interval according to the formula (1):
Q＝(I ripple (n) 2 -I ripple (n-1) 2 ) Formula (1) of X Re. Times. Delta.t
Wherein Q is the energy loss value of the electrolytic capacitor in a preset time interval, I ripple (n) and I ripple (n-1) ripple currents of the electrolytic capacitors at the nth time and the nth-1 time respectively, re is the equivalent resistance of the electrolytic capacitors, and delta t is a preset time interval.
The ripple current is a harmonic component in the current, and the loss due to heat generation inside the electrolytic capacitor is caused by the ripple current and the equivalent resistance of the electrolytic capacitor. The calculation of the energy loss value of the electrolytic capacitor from the ripple current is therefore a relatively precise adjustment.
In the present embodiment, the preset time interval may be set arbitrarily, such as 0.1s, 0.3s, 1s, 2s, and so on. However, the shorter the preset time interval is, the more the calculated energy loss value data is, the faster the accumulated response speed is, and the more accurate the adjustment is.
In some specific embodiments of the present application, the preset time is set to 1s, step 210 may collect the total operating current before 1s and after 1s by using a current detection device, step 220 may calculate a ripple current value corresponding to the current through formula (2), and finally step 230 calculates an energy loss value within the 1 s.
I ripple ＝a×I General (1) +bFormula (2)
Wherein a and b are both constants, I General assembly To run the total current.
Referring to fig. 5, in some other embodiments of the present application, calculating the energy loss value of the electrolytic capacitor in the preset time period according to the total current may further be implemented by the following steps, including:
step S310, periodically collecting total running current at preset time intervals;
step S320, calculating the ripple current of the corresponding electrolytic capacitor according to the running total current;
step S330, establishing a relational expression of ripple current and time of the electrolytic capacitor in a preset time period; and
step S340, calculating the energy loss value of the electrolytic capacitor within the preset time interval according to the following formula:
Figure BDA0002497140500000071
wherein Q is the energy loss value of the electrolytic capacitor in a preset time interval, I ripple Re is the equivalent resistance of the electrolytic capacitor, and n-1 are two moments different by a preset time interval.
In some specific embodiments of the present application, steps S310 and S320 may be implemented in a manner consistent with steps S210 and S220 in the above embodiments. Step S330 may use computer software to establish a relation between the ripple current of the electrolytic capacitor and time within a preset time period. And finally, integrating the relational expression in a preset time interval through a formula (3) to obtain an energy loss value of the electrolytic capacitor in the preset time interval.
In some embodiments of the present application, the step of reducing the operating frequency of the compressor 10 further comprises:
the reduction ratio of the operating frequency of the compressor 10 is determined according to the ratio at which the accumulated value of the energy loss of the electrolytic capacitor exceeds the energy loss threshold value.
In general, the accumulated energy loss value of the electrolytic capacitor is generally positively correlated with the operating frequency of the compressor 10. When the ratio of the accumulated energy loss value of the electrolytic capacitor exceeding the energy loss threshold value is larger, the current operating frequency of the compressor 10 is considered to be too large, and the operating frequency of the compressor 10 may be configured to be reduced to a larger extent.
In other embodiments of the present application, the reduction ratio is proportional to a ratio at which an accumulated energy loss value of the electrolytic capacitor exceeds an energy loss threshold.
In some specific embodiments of the present application, when the proportional ratio in the above embodiments is 1, the operating frequency of the compressor 10 is reduced by 10% when the accumulated energy loss value of the electrolytic capacitor exceeds 10% of the energy loss threshold value; when the energy loss accumulated value of the electrolytic capacitor exceeds 30% of the energy loss threshold value, the operating frequency of the compressor 10 is reduced by 30%; when the energy loss accumulated value of the electrolytic capacitor exceeds 50% of the energy loss threshold value, the operating frequency of the compressor 10 is reduced by 50%; when the accumulated value of the energy loss of the electrolytic capacitor exceeds 80% of the energy loss threshold value, the operating frequency of the compressor 10 is reduced by 80%; when the accumulated value of the energy loss of the electrolytic capacitor exceeds 100% of the energy loss threshold value, the operating frequency of the compressor 10 is decreased by 100%, i.e., the compressor 10 is stopped.
Of course, a person skilled in the art may also set a direct proportionality coefficient between the reduction ratio of the compressor 10 and the ratio of the accumulated energy loss value of the electrolytic capacitor exceeding the energy loss threshold to any number according to the actual working condition, and this embodiment only provides one of the embodiments, and other cases are not described herein.
In some embodiments of the present application, the accumulated energy loss value of the electrolytic capacitor is stored in a storage of the air conditioner; and/or stored in a cloud database through a Wi-Fi module.
In the embodiment, when the energy loss accumulated value of the electrolytic capacitor is stored in the storage of the air conditioner, the energy loss accumulated value data of the zero clearing electrolytic capacitor is cleared locally; and when the energy loss accumulated value of the electrolytic capacitor is stored in the cloud database through the Wi-Fi module, clearing the energy loss accumulated value data of the electrolytic capacitor in the cloud database.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims (9)

1. A control method of an air conditioner compressor comprises a PFC circuit and an electrolytic capacitor connected with the output end of the PFC circuit in parallel; and, the control method includes:
acquiring the total operating current of the air conditioner, and calculating the energy loss value of the electrolytic capacitor within a preset time interval according to the total operating current;
acquiring the current energy loss accumulated value of the electrolytic capacitor, and accumulating the energy loss value of the electrolytic capacitor in the preset time interval into the energy loss accumulated value of the electrolytic capacitor; and
judging whether the accumulated energy loss value of the electrolytic capacitor is larger than a preset energy loss threshold value or not;
if so, reducing the operating frequency of the compressor;
if not, the compressor keeps the previous running frequency running;
the control method further comprises the following steps:
acquiring the current moment; and
judging whether the current moment is a preset moment in a preset time period or not;
and if not, clearing the stored energy loss accumulated value of the electrolytic capacitor.
2. The control method of claim 1, wherein the step of calculating the energy loss value of the electrolytic capacitor in a preset time interval according to the running total current further comprises:
periodically collecting the running total current at the preset time interval;
calculating the corresponding ripple current of the electrolytic capacitor according to the running total current; and
calculating the energy loss value of the electrolytic capacitor within a preset time interval according to the following formula:
Q＝(I ripple (n) 2 -I ripple (n-1) 2 )×Re×Δt
wherein Q is the energy loss value of the electrolytic capacitor in a preset time interval, I ripple (n) and I ripple (n-1) ripple currents of the electrolytic capacitor at the nth time and the nth-1 time respectively, re is an equivalent resistance of the electrolytic capacitor, and delta t is the preset time interval.
3. The control method according to claim 1, wherein the step of calculating the energy loss value in the preset time period of the electrolytic capacitor from the total current further comprises:
periodically collecting the running total current at the preset time interval;
calculating the corresponding ripple current of the electrolytic capacitor according to the running total current;
establishing a relational expression between the ripple current of the electrolytic capacitor and the time within the preset time period; and
calculating the energy loss value of the electrolytic capacitor within a preset time interval according to the following formula:
Figure FDA0003845665840000021
wherein Q is the energy loss value of the electrolytic capacitor in a preset time interval, I ripple And (2) the ripple current of the electrolytic capacitor, re is the equivalent resistance of the electrolytic capacitor, and n-1 are two moments with the difference of the preset time interval respectively.
4. The control method according to claim 1,
the preset energy loss threshold value is any value selected from the range of 10 KJ-20 KJ.
5. The control method according to claim 1,
the preset time period is 1 or more days.
6. The control method of claim 1, wherein the step of reducing the operating frequency of the compressor further comprises:
and determining the reduction proportion of the operating frequency of the compressor according to the proportion of the accumulated energy loss value of the electrolytic capacitor exceeding the energy loss threshold value.
7. The control method according to claim 6,
the reduction ratio is proportional to a ratio at which an accumulated value of energy loss of the electrolytic capacitor exceeds the energy loss threshold.
8. The control method according to claim 1, further comprising:
the accumulated energy loss value of the electrolytic capacitor is stored in a storage of the air conditioner; and/or
And the data is stored in a cloud database through a Wi-Fi module.
9. An air conditioner comprising:
a controller comprising a memory and a processor, the memory having stored therein a computer program for implementing the control method according to any one of claims 1 to 8 when executed by the processor.
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