CN115200185A - Air conditioner and PFC circuit control method of air conditioner - Google Patents
Air conditioner and PFC circuit control method of air conditioner Download PDFInfo
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- CN115200185A CN115200185A CN202210861372.8A CN202210861372A CN115200185A CN 115200185 A CN115200185 A CN 115200185A CN 202210861372 A CN202210861372 A CN 202210861372A CN 115200185 A CN115200185 A CN 115200185A
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/62—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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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- 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
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- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner and a PFC circuit control method thereof, wherein the air conditioner comprises the following steps: a compressor; a fan; the output end of the PFC circuit is connected with the compressor and the fan; a controller to: when the input current of the air conditioner is detected to be larger than or equal to a PFC starting current threshold, controlling the PFC circuit to be started until the input current of the air conditioner is detected to be smaller than or equal to a PFC turn-off current threshold, controlling the PFC circuit to be turned off, and acquiring a first time difference between the latest starting time and the current turn-off time of the PFC circuit; when the preset condition is determined to be met, increasing the PFC starting current threshold value by a preset increment; wherein the preset condition includes that the first time difference is less than a preset time length. By adopting the embodiment of the invention, the repeated turn-on and turn-off of the PFC circuit in a short time can be effectively reduced, and the user experience is improved.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to an air conditioner and a PFC circuit control method of the air conditioner.
Background
The present variable frequency air conditioner all has the PFC circuit, and the purpose has two: firstly, adjusting a power factor; secondly, the voltage of a direct current bus is increased, the voltage of the direct current bus mainly provides a power supply for a compressor and a fan motor, meanwhile, an alternating current input current sampling circuit is designed on a PFC circuit, the alternating current input current can be sampled in real time, the current starting method mainly comprises the steps of starting and stopping according to the size of the alternating current input current, starting when the current is Ion, stopping when the current is Ion, and setting the appropriate return difference when the current is more than Ion.
However, before and after the PFC circuit is turned on, the waveform of the ac input current is different, the waveform of the ac input current before turning on is non-sinusoidal, the peak value of the current is large, the waveform of the ac input current after turning on is substantially sinusoidal, and the peak value of the current is relatively small, because the software adopts the same current sampling algorithm, the magnitude of the sampling current calculated by the software is different, in general, the ac input current calculated by the software before turning on the PFC is large, which results in that once the PFC circuit is turned on, the ac input current calculated by the software becomes small, even reaches the turn-off threshold Ioff of the PFC circuit, causing the PFC to be turned off immediately after turning on, and after the PFC circuit is turned off, the ac input current calculated by the software becomes large, which reaches the turn-on threshold Ioff of the PFC circuit, so that the cycle is repeated on and off many times at the stage when the air conditioner is just turned on, and the dc bus voltage is also high and low, which results in bad: because the power supply of the fan motor is from the direct current bus voltage, and the PFC circuit is repeatedly turned on and off at present, the direct current bus voltage correspondingly rises and falls along with the turning on and off of the PFC, and then the rotating speed of the fan motor is suddenly high and suddenly low, the feeling given to a user is that the wind sound is suddenly high and suddenly low, and the user experience is greatly influenced.
The current solution is to increase the difference between the PFC on current threshold and the PFC off current threshold, or to increase the PFC on current threshold before shipment. However, in the process of implementing the present invention, the inventor finds that, because the power supplies of users are different and the quality of the power grid is also different, the ac input voltage waveforms of the users are also very different, and the corresponding ac input current waveforms are also very different, so that the ac input current values calculated by corresponding software are also different for different current waveforms, even if the difference between the PFC on current threshold and the PFC off current threshold or the PFC on current threshold is increased, the ac input current values cannot be matched with the actual input current, and the problem that the PFC circuit is repeatedly turned on and off in a short time cannot be well solved.
Disclosure of Invention
The embodiment of the invention provides an air conditioner and a PFC circuit control method of the air conditioner, which can effectively reduce the occurrence of repeated turn-on and turn-off of a PFC circuit in a short time and improve the user experience.
An embodiment of the present invention provides an air conditioner, including:
a compressor;
a fan;
the output end of the PFC circuit is connected with the compressor and the fan;
a controller to:
when the input current of the air conditioner is detected to be larger than or equal to a PFC starting current threshold, controlling the PFC circuit to be started until the input current of the air conditioner is detected to be smaller than or equal to a PFC turn-off current threshold, controlling the PFC circuit to be turned off, and acquiring a first time difference between the latest starting time and the current turn-off time of the PFC circuit;
when the preset condition is determined to be met, increasing the PFC starting current threshold value by a preset increment; wherein the preset condition includes that the first time difference is less than a preset time length.
Compared with the prior art, the air conditioner provided by the embodiment of the invention controls the PFC circuit to be started when the input current of the air conditioner is detected to be larger than or equal to the PFC starting current threshold value, controls the PFC circuit to be turned off until the input current of the air conditioner is detected to be smaller than or equal to the PFC turning-off current threshold value, obtains the first time difference between the latest starting time and the current turning-off time of the PFC circuit, and increases the PFC starting current threshold value by the preset increment when the preset condition that at least the first time difference is smaller than the preset duration is met, so that the starting current threshold value of the PFC circuit is increased step by step when the PFC circuit is turned off in a short time after being started, the repeated starting and turning-off of the PFC circuit in a short time are effectively reduced, the wind noise is avoided being large and small, and the user experience is improved.
As an improvement of the above, the controller is further configured to:
and when the first time difference is determined to be greater than or equal to the preset duration, controlling the PFC starting current threshold to be kept unchanged.
In this embodiment, when it is determined that the first time difference is greater than or equal to the preset time duration, the PFC on current threshold is controlled to remain unchanged, so that it is possible to avoid setting the on current threshold of the PFC circuit to be too large, thereby ensuring that the power factor meets the requirement of the air conditioner on high-frequency operation.
As an improvement of the above, the controller is further configured to:
when the PFC circuit is controlled to be started, a second time difference between the latest turn-off time and the current start time of the PFC circuit is obtained;
wherein the preset condition further includes that the second time difference is smaller than the preset duration.
In this embodiment, when the PFC circuit is controlled to be turned on, a second time difference between a last turn-off time and a current turn-on time of the PFC circuit is obtained, and the preset condition is set to further include that the second time difference is smaller than the preset duration, so that when the PFC circuit is turned off in a very short time after being turned on and turned on in a very short time after being turned off, the threshold of the turn-on current of the PFC circuit is gradually increased.
As an improvement of the above, the controller is further configured to:
and when the second time difference is determined to be greater than or equal to the preset time length, controlling the PFC starting current threshold to be kept unchanged.
In this embodiment, when it is determined that the second time difference is greater than or equal to the preset time, the PFC starting current threshold is controlled to remain unchanged, so that the PFC circuit can be prevented from being set too large, and the power factor can be ensured to meet the requirement of the air conditioner for high-frequency operation.
As an improvement of the above scheme, the PFC circuit includes:
the input end of the positive pole of the alternating current power supply is used for connecting the positive pole of the alternating current power supply;
the input end of the negative pole of the alternating current power supply is used for connecting the negative pole of the alternating current power supply;
the first end of the fuse is connected with the positive input end of the alternating current power supply;
a first input end of the rectifier bridge unit is connected with a second end of the fuse, and a second input end of the rectifier bridge unit is connected with a negative electrode input end of the alternating current power supply;
the first capacitor is connected between the first output end and the second output end of the rectifier bridge unit;
the first end of the inductor is connected with the first output end of the rectifier bridge unit;
the first end of the resistor is connected with the second output end of the rectifier bridge unit;
the switch tube is connected between the second end of the inductor and the second end of the resistor, and the control end of the switch tube is connected with the controller;
the anode of the diode is connected with the second end of the inductor;
the power supply positive output end is connected with the cathode of the diode, and is also connected with the positive input ends of the fan and the compressor;
the power supply negative electrode output end is connected with the second end of the resistor, and the power supply positive electrode output end is also connected with the negative electrode input ends of the fan and the compressor;
and the second capacitor is connected between the positive output end of the power supply and the negative output end of the power supply.
Another embodiment of the present invention provides a PFC circuit control method of an air conditioner, the air conditioner including a PFC circuit; the method comprises the following steps:
when the input current of the air conditioner is detected to be larger than or equal to a PFC starting current threshold value, controlling the PFC circuit to be started until the input current of the air conditioner is detected to be smaller than or equal to a PFC turn-off current threshold value, controlling the PFC circuit to be turned off, and acquiring a first time difference between the latest starting time and the current turn-off time of the PFC circuit;
when the preset condition is determined to be met, increasing the PFC starting current threshold value by a preset increment; wherein the preset condition includes that the first time difference is less than a preset time length.
Compared with the prior art, the method for controlling the PFC circuit of the air conditioner provided by the embodiment of the invention controls the PFC circuit to be started when the input current of the air conditioner is detected to be greater than or equal to the PFC starting current threshold value, controls the PFC circuit to be turned off until the input current of the air conditioner is detected to be less than or equal to the PFC turning-off current threshold value, obtains the first time difference between the latest starting time and the current turning-off time of the PFC circuit, and increases the PFC starting current threshold value by the preset increment when the preset condition that the PFC circuit is turned off in a short time after being started is determined to be satisfied, so that the starting current threshold value of the PFC circuit is gradually increased, the repeated starting and turning-off of the PFC circuit in a short time is effectively reduced, the noise is avoided from being too loud and the user experience is improved.
As an improvement of the above, the method further comprises:
and when the first time difference is determined to be larger than or equal to the preset duration, controlling the PFC starting current threshold to be kept unchanged.
In this embodiment, when it is determined that the first time difference is greater than or equal to the preset time duration, the PFC starting current threshold is controlled to remain unchanged, so that the PFC circuit can be prevented from being set too large, and the power factor is ensured to meet the requirement of the air conditioner for high-frequency operation.
As an improvement of the above, the method further comprises:
when the PFC circuit is controlled to be started, a second time difference between the latest turn-off time and the current start time of the PFC circuit is obtained;
wherein the preset condition further includes that the second time difference is smaller than the preset duration.
In this embodiment, when the PFC circuit is controlled to be turned on, a second time difference between a last turn-off time and a current turn-on time of the PFC circuit is obtained, and the preset condition is set to further include that the second time difference is smaller than the preset duration, so that when the PFC circuit is turned off in a very short time after being turned on and turned on in a very short time after being turned off, the threshold of the turn-on current of the PFC circuit is gradually increased.
As an improvement of the above, the method further comprises:
and when the second time difference is determined to be greater than or equal to the preset time length, controlling the PFC starting current threshold to be kept unchanged.
In this embodiment, when it is determined that the second time difference is greater than or equal to the preset time duration, the PFC on current threshold is controlled to remain unchanged, so that it is possible to avoid setting the on current threshold of the PFC circuit to be too large, thereby ensuring that the power factor meets the requirement of the air conditioner on high-frequency operation.
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 diagram of an internal circuit structure of an air conditioner according to an embodiment of the present invention;
fig. 3 is a waveform diagram of an input current before the PFC circuit is turned on according to an embodiment of the present invention;
fig. 4 is a waveform diagram of an input current after the PFC circuit according to an embodiment of the present invention is turned on;
fig. 5 is a first specific flowchart of a controller of an air conditioner according to an embodiment of the present invention;
fig. 6 is a second specific flowchart of a controller of an air conditioner according to an embodiment of the present invention;
fig. 7 is a third specific flowchart of a controller of an air conditioner according to an embodiment of the present invention;
fig. 8 is a schematic diagram illustrating a fourth specific operation flow of a controller of an air conditioner according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a PFC circuit of an air conditioner according to an embodiment of the present invention;
fig. 10 is a flowchart illustrating a PFC circuit control method for an air conditioner according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention.
The air conditioner 1 provided by the embodiment of the invention comprises an outdoor unit 2 and an indoor unit 3. The outdoor unit 2 of the air conditioner 1 refers to a portion of a refrigeration cycle including a compressor 21 and an outdoor heat exchanger, the indoor unit 3 of the air conditioner 1 includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit 3 or the outdoor unit 2. The indoor unit 3 and the outdoor unit 2 are connected by an on-line pipe 4 to form a refrigerant circuit for circulating a refrigerant.
The outdoor unit 2 is generally installed outdoors and used for heat exchange in an indoor environment. In the illustration of fig. 1, the outdoor unit 2 is indicated by a broken line because the outdoor unit 2 is located outdoors on the opposite side of the indoor unit 3 with respect to the wall surface WL.
The air conditioner 1 provided in the present embodiment includes a compressor 21, a condenser, an expansion valve, and an evaporator, and performs a refrigeration cycle of the air conditioner 1 by using the compressor 21, the condenser, the expansion valve, and the evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged. The compressor 21 compresses the refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process. The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve, and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor 21. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner 1 can adjust the temperature of the indoor space throughout the cycle.
Referring to fig. 2, the air conditioner 1 according to the present embodiment includes a fan 31, and the fan 31 is provided in the indoor unit 3. The fan 31 generates an air flow of the indoor air passing through the indoor heat exchanger to promote heat exchange between the refrigerant flowing in the heat transfer tubes and the indoor air.
Referring to fig. 2, the air conditioner 1 according to the present embodiment includes a PFC (Power Factor Correction) circuit 5, an input end of the PFC circuit 5 is connected to an ac Power supply, and an output end of the PFC circuit 5 is connected to the compressor 21 and the fan 31. The PFC circuit 5 is designed with an ac input current sampling circuit, which can sample the input current of the air conditioner 1 in real time. Illustratively, the input current waveform before the PFC circuit 5 is turned on is non-sinusoidal, as shown in fig. 3, where the peak value of the current is large, and the input current waveform after the turn on is substantially sinusoidal, as shown in fig. 4, where the peak value of the current is relatively small.
Referring to fig. 2, the air conditioner 1 provided in the present embodiment has a controller 6. The controller 6 is connected to the PFC circuit 5 to obtain an input current of the air conditioner 1 and control a working state of the PFC circuit 5. The controller 6 is specifically configured to:
controlling the PFC circuit 5 to be turned on when detecting that the input current of the air conditioner 1 is greater than or equal to a PFC turn-on current threshold value, controlling the PFC circuit 5 to be turned off until detecting that the input current of the air conditioner 1 is less than or equal to a PFC turn-off current threshold value, and acquiring a first time difference between the latest turn-on time and the current turn-off time of the PFC circuit 5;
when the preset condition is determined to be met, increasing the PFC starting current threshold value by a preset increment; wherein the preset condition includes that the first time difference is less than a preset time length.
It should be noted that the initial values of the PFC on current threshold and the PFC off current threshold may be preset at the time of factory shipment, and are not limited herein. In a specific implementation, the preset increment may be set according to an actual requirement, for example, may be set to be 5%, 10%, and the like of an initial value of the PFC on-current threshold, which is not limited herein.
As shown in fig. 5, the first specific operation process of the controller 6 is as follows: detecting whether the input current of the air conditioner 1 is larger than or equal to a PFC starting current threshold value (step S11); when detecting that the input current of the air conditioner 1 is greater than or equal to a PFC starting current threshold value, controlling the PFC circuit 5 to be started (step S12); detecting whether the input current of the air conditioner 1 is less than or equal to a PFC off current threshold (step S13); when detecting that the input current of the air conditioner 1 is less than or equal to a PFC off current threshold, controlling the PFC circuit 5 to turn off, and obtaining a first time difference between a latest turn-on time and a current turn-off time of the PFC circuit 5 (step S14); judging whether a preset condition is met, wherein the preset condition comprises that the first time difference is smaller than a preset duration (step S15); and when the preset condition is determined to be met, increasing the PFC starting current threshold by a preset increment (step S16), and returning to the step S11.
Compared with the prior art, in the air conditioner 1 provided by the embodiment of the invention, the PFC circuit 5 is controlled to be turned on when the input current of the air conditioner 1 is detected to be greater than or equal to the PFC on-current threshold value, the PFC circuit 5 is controlled to be turned off until the input current of the air conditioner 1 is detected to be less than or equal to the PFC off-current threshold value, the first time difference between the latest on time and the current off time of the PFC circuit 5 is obtained, and the PFC on-current threshold value is increased by the preset increment when the preset condition that the PFC circuit 5 is turned off in a short time after being turned on is determined to be satisfied, so that the on-current threshold value of the PFC circuit 5 is gradually increased, the repeated turning on and turning off of the PFC circuit 5 in a short time is effectively reduced, the noise is avoided from being overlooked, and the user experience is improved. It can be understood that, by adopting the embodiment, it can be ensured that the PFC starting current threshold is not affected to the maximum extent, that is, under most circumstances, the PFC starting current threshold is not raised, and only under a special condition, that is, under the condition that the PFC circuit 5 is turned off in a short time after being turned on, the PFC starting current threshold is raised, and can be matched with the actual input current, and in addition, a mode of gradually increasing is adopted, the raised amplitude is not large, the PFC starting current threshold is ensured not to be too large, the reliability is ensured, only a small current range is ensured to be sacrificed, and the unqualified power factor is avoided.
As an alternative embodiment, the controller 6 is further configured to:
and when the first time difference is determined to be greater than or equal to the preset duration, controlling the PFC starting current threshold to be kept unchanged.
Referring to fig. 6, the second specific operation process of the controller 6 is as follows: detecting whether the input current of the air conditioner 1 is larger than or equal to a PFC starting current threshold value (step S11); when detecting that the input current of the air conditioner 1 is greater than or equal to a PFC starting current threshold value, controlling the PFC circuit 5 to be started (step S12); detecting whether the input current of the air conditioner 1 is less than or equal to a PFC off current threshold (step S13); when detecting that the input current of the air conditioner 1 is smaller than or equal to a PFC turn-off current threshold, controlling the PFC circuit 5 to be turned off, and acquiring a first time difference between the latest turn-on time and the current turn-off time of the PFC circuit 5 (step S14); judging whether a preset condition is met, wherein the preset condition comprises that the first time difference is smaller than a preset duration (step S15); when the preset condition is determined to be met, increasing the PFC starting current threshold by a preset increment (step S16), and returning to the step S11; and when the first time difference is determined to be greater than or equal to the preset time length, controlling the PFC starting current threshold to be kept unchanged (step S17), and returning to step S11.
In this embodiment, when it is determined that the first time difference is greater than or equal to the preset time duration, the PFC on current threshold is controlled to remain unchanged, so that it is possible to avoid setting the on current threshold of the PFC circuit 5 to be too large, thereby ensuring that the power factor meets the requirement of the air conditioner 1 on high-frequency operation.
As an alternative embodiment, the controller 6 is further configured to:
when the PFC circuit 5 is controlled to be started, a second time difference between the latest turn-off time and the current turn-on time of the PFC circuit 5 is obtained;
wherein the preset condition further includes that the second time difference is smaller than the preset duration.
It should be noted that, in this embodiment, it can be determined that the preset condition is satisfied when both the first time difference and the second time difference are smaller than the preset time length.
Referring to fig. 7, the third specific operation process of the controller 6 is as follows: detecting whether the input current of the air conditioner 1 is larger than or equal to a PFC starting current threshold value (step S11); when detecting that the input current of the air conditioner 1 is greater than or equal to the PFC starting current threshold, controlling the PFC circuit 5 to start, and acquiring a second time difference between the latest turn-off time and the current turn-on time of the PFC circuit 5 (step S12'); detecting whether the input current of the air conditioner 1 is less than or equal to a PFC off current threshold (step S13); when detecting that the input current of the air conditioner 1 is less than or equal to a PFC off current threshold, controlling the PFC circuit 5 to turn off, and obtaining a first time difference between a latest turn-on time and a current turn-off time of the PFC circuit 5 (step S14); judging whether a preset condition is met, wherein the preset condition is that the first time difference is smaller than a preset time length and the second time difference is smaller than the preset time length (step S15); and when the preset condition is determined to be met, increasing the PFC starting current threshold by a preset increment (step S16), and returning to the step S11.
In this embodiment, the second time difference between the latest turn-off time and the current turn-on time of the PFC circuit 5 is obtained while the PFC circuit 5 is controlled to be turned on, and the preset condition further includes that the second time difference is smaller than the preset duration, so that when the PFC circuit 5 is turned off in a very short time after being turned on and is turned on in a very short time after being turned off, the threshold of the turn-on current of the PFC circuit 5 is gradually increased.
Further, the controller 6 is further configured to:
and when the second time difference is determined to be greater than or equal to the preset time length, controlling the PFC starting current threshold to be kept unchanged.
Referring to fig. 8, a fourth specific operation process of the controller 6 is as follows: detecting whether the input current of the air conditioner 1 is larger than or equal to a PFC starting current threshold value (step S11); when detecting that the input current of the air conditioner 1 is greater than or equal to the PFC starting current threshold, controlling the PFC circuit 5 to start, and acquiring a second time difference between the latest turn-off time and the current turn-on time of the PFC circuit 5 (step S12'); detecting whether the input current of the air conditioner 1 is less than or equal to a PFC off current threshold (step S13); when detecting that the input current of the air conditioner 1 is smaller than or equal to a PFC turn-off current threshold, controlling the PFC circuit 5 to be turned off, and acquiring a first time difference between the latest turn-on time and the current turn-off time of the PFC circuit 5 (step S14); judging whether a preset condition is met, wherein the preset condition is that the first time difference is smaller than a preset time length and the second time difference is smaller than the preset time length (step S15); when the preset condition is determined to be met, increasing the PFC starting current threshold by a preset increment (step S16), and returning to the step S11; and when the second time difference is determined to be greater than or equal to the preset time length, controlling the PFC starting current threshold to be kept unchanged (step S18), and returning to the step S11.
In this embodiment, when it is determined that the second time difference is greater than or equal to the preset time, the PFC on-current threshold is controlled to remain unchanged, so that the on-current threshold of the PFC circuit 5 can be prevented from being set too large, and the power factor is ensured to meet the requirement of the air conditioner 1 for high-frequency operation.
Referring to fig. 9, the PFC circuit 5 includes:
the input end of the positive pole of the alternating current power supply is used for connecting the positive pole of the alternating current power supply AC;
the input end of the negative pole of the alternating current power supply is used for connecting the negative pole of the alternating current power supply AC;
a first end of the fuse F1 is connected with the positive input end of the alternating current power supply;
a first input end of the rectifier bridge unit B1 is connected with a second end of the fuse F1, and a second input end of the rectifier bridge unit B1 is connected with a negative electrode input end of the alternating current power supply;
the first capacitor C1 is connected between the first output end and the second output end of the rectifier bridge unit B1;
a first end of the inductor L1 is connected with a first output end of the rectifier bridge unit B1;
a first end of the resistor R1 is connected with a second output end of the rectifier bridge unit B1;
the switch tube K1, the switch tube K1 is connected between the second end of the inductor L1 and the second end of the resistor R1, and the control end of the switch tube K1 is connected to the controller 6;
the anode of the diode D1 is connected with the second end of the inductor L1;
the power supply positive electrode output end is connected with the negative electrode of the diode D1, and is also connected with the fan 31 and the positive electrode input end of the compressor 21;
the power supply negative electrode output end is connected with the second end of the resistor R1, and the power supply positive electrode output end is also connected with the fan 31 and the negative electrode input end of the compressor 21;
and the second capacitor C2 is connected between the positive output end of the power supply and the negative output end of the power supply.
Referring to fig. 10, another embodiment of the present invention provides a PFC circuit control method of an air conditioner, the air conditioner including a PFC circuit; the method comprises the following steps:
s21, when the input current of the air conditioner is detected to be larger than or equal to a PFC starting current threshold value, controlling the PFC circuit to be started until the input current of the air conditioner is detected to be smaller than or equal to a PFC turn-off current threshold value, controlling the PFC circuit to be turned off, and acquiring a first time difference between the latest starting time and the current turn-off time of the PFC circuit;
s22, when the preset condition is determined to be met, increasing the PFC starting current threshold value by a preset increment; wherein the preset condition includes that the first time difference is less than a preset time length.
Compared with the prior art, the method for controlling the PFC circuit of the air conditioner provided by the embodiment of the invention controls the PFC circuit to be started when the input current of the air conditioner is detected to be greater than or equal to the PFC starting current threshold value, controls the PFC circuit to be turned off until the input current of the air conditioner is detected to be less than or equal to the PFC turning-off current threshold value, obtains the first time difference between the latest starting time and the current turning-off time of the PFC circuit, and increases the PFC starting current threshold value by the preset increment when the preset condition that the PFC circuit is turned off in a short time after being started is determined to be satisfied, so that the starting current threshold value of the PFC circuit is gradually increased, the repeated starting and turning-off of the PFC circuit in a short time is effectively reduced, the noise is avoided from being too loud and the user experience is improved.
As an improvement of the above, the method further comprises:
and when the first time difference is determined to be greater than or equal to the preset duration, controlling the PFC starting current threshold to be kept unchanged.
In this embodiment, when it is determined that the first time difference is greater than or equal to the preset time duration, the PFC starting current threshold is controlled to remain unchanged, so that the PFC circuit can be prevented from being set too large, and the power factor is ensured to meet the requirement of the air conditioner for high-frequency operation.
As an improvement of the above, the method further comprises:
when the PFC circuit is controlled to be started, a second time difference between the latest turn-off time and the current start time of the PFC circuit is obtained;
wherein the preset condition further includes that the second time difference is smaller than the preset duration.
In this embodiment, when the PFC circuit is controlled to be turned on, a second time difference between a last turn-off time and a current turn-on time of the PFC circuit is obtained, and the preset condition is set to further include that the second time difference is smaller than the preset duration, so that when the PFC circuit is turned off in a very short time after being turned on and turned on in a very short time after being turned off, the threshold of the turn-on current of the PFC circuit is gradually increased.
As an improvement of the above, the method further comprises:
and when the second time difference is determined to be greater than or equal to the preset time length, controlling the PFC starting current threshold to be kept unchanged.
In this embodiment, when it is determined that the second time difference is greater than or equal to the preset time duration, the PFC on current threshold is controlled to remain unchanged, so that it is possible to avoid setting the on current threshold of the PFC circuit to be too large, thereby ensuring that the power factor meets the requirement of the air conditioner on high-frequency operation.
It should be noted that the above method embodiments and the above apparatus embodiments belong to a general inventive concept, and therefore, specific descriptions of the above method embodiments may refer to the above apparatus embodiments and are not repeated herein.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. An air conditioner, comprising:
a compressor;
a fan;
the output end of the PFC circuit is connected with the compressor and the fan;
a controller to:
when the input current of the air conditioner is detected to be larger than or equal to a PFC starting current threshold value, controlling the PFC circuit to be started until the input current of the air conditioner is detected to be smaller than or equal to a PFC turn-off current threshold value, controlling the PFC circuit to be turned off, and obtaining a first time difference between the latest starting time and the current turn-off time of the PFC circuit;
when the condition that a preset condition is met is determined, increasing the PFC starting current threshold value by a preset increment; wherein the preset condition includes that the first time difference is less than a preset time length.
2. The air conditioner of claim 1, wherein the controller is further configured to:
and when the first time difference is determined to be greater than or equal to the preset duration, controlling the PFC starting current threshold to be kept unchanged.
3. The air conditioner of claim 1, wherein the controller is further configured to:
when the PFC circuit is controlled to be started, a second time difference between the latest turn-off time and the current start time of the PFC circuit is obtained;
wherein the preset condition further includes that the second time difference is smaller than the preset duration.
4. The air conditioner of claim 3, wherein the controller is further configured to:
and when the second time difference is determined to be greater than or equal to the preset time length, controlling the PFC starting current threshold to be kept unchanged.
5. The air conditioner of claim 1, wherein the PFC circuit comprises:
the input end of the positive pole of the alternating current power supply is used for connecting the positive pole of the alternating current power supply;
the input end of the negative pole of the alternating current power supply is used for connecting the negative pole of the alternating current power supply;
the first end of the fuse is connected with the positive input end of the alternating current power supply;
a first input end of the rectifier bridge unit is connected with a second end of the fuse, and a second input end of the rectifier bridge unit is connected with a negative electrode input end of the alternating current power supply;
the first capacitor is connected between the first output end and the second output end of the rectifier bridge unit;
the first end of the inductor is connected with the first output end of the rectifier bridge unit;
the first end of the resistor is connected with the second output end of the rectifier bridge unit;
the switch tube is connected between the second end of the inductor and the second end of the resistor, and the control end of the switch tube is connected with the controller;
the anode of the diode is connected with the second end of the inductor;
the power supply positive electrode output end is connected with the negative electrode of the diode, and is also connected with the positive electrode input ends of the fan and the compressor;
the power supply negative electrode output end is connected with the second end of the resistor, and the power supply positive electrode output end is also connected with the fan and the negative electrode input end of the compressor;
and the second capacitor is connected between the positive output end of the power supply and the negative output end of the power supply.
6. A PFC circuit control method of an air conditioner is characterized in that the air conditioner comprises a PFC circuit; the method comprises the following steps:
when the input current of the air conditioner is detected to be larger than or equal to a PFC starting current threshold, controlling the PFC circuit to be started until the input current of the air conditioner is detected to be smaller than or equal to a PFC turn-off current threshold, controlling the PFC circuit to be turned off, and acquiring a first time difference between the latest turn-on time and the current turn-off time of the PFC circuit;
when the preset condition is determined to be met, increasing the PFC starting current threshold value by a preset increment; wherein the preset condition includes that the first time difference is less than a preset time length.
7. The PFC circuit control method of claim 6, wherein the method further comprises:
and when the first time difference is determined to be greater than or equal to the preset duration, controlling the PFC starting current threshold to be kept unchanged.
8. The PFC circuit control method of claim 6, wherein the method further comprises:
when the PFC circuit is controlled to be started, a second time difference between the latest turn-off time and the current start time of the PFC circuit is obtained;
wherein the preset condition further includes that the second time difference is smaller than the preset duration.
9. The PFC circuit control method of claim 8, further comprising:
and when the second time difference is determined to be greater than or equal to the preset time length, controlling the PFC starting current threshold to be kept unchanged.
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