CN115200185B - Air conditioner and PFC circuit control method thereof - Google Patents
Air conditioner and PFC circuit control method thereof Download PDFInfo
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- CN115200185B CN115200185B CN202210861372.8A CN202210861372A CN115200185B CN 115200185 B CN115200185 B CN 115200185B CN 202210861372 A CN202210861372 A CN 202210861372A CN 115200185 B CN115200185 B CN 115200185B
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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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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Power Engineering (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses an air conditioner and a PFC circuit control method of the air conditioner, the air conditioner comprises: a compressor; a blower; the output end of the PFC circuit is connected with the compressor and the fan; a controller for: when the input current of the air conditioner is detected to be greater than or equal to a PFC opening current threshold value, the PFC circuit is controlled to be opened until the input current of the air conditioner is detected to be less than or equal to a PFC closing current threshold value, the PFC circuit is controlled to be closed, and a first time difference between the last opening time and the current closing time of the PFC circuit is obtained; when the preset condition is determined to be met, increasing the PFC starting current threshold by a preset increment; wherein the preset condition includes that the first time difference is smaller than a preset duration. By adopting the embodiment of the invention, the occurrence of the condition that the PFC circuit is repeatedly turned on and off 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 prior variable frequency air conditioner is provided with PFC circuits, and the purposes are two: firstly, adjusting a power factor; and secondly, increasing the voltage of a direct current bus, wherein the voltage of the direct current bus mainly supplies power to a compressor and a fan motor, an alternating current input current sampling circuit is designed in the PFC circuit, and the alternating current input current can be sampled in real time.
However, because the waveforms of the ac input current before and after the PFC circuit is turned on are different, the waveform of the ac input current before the start is non-sinusoidal, the peak value of the current is larger, the waveform of the ac input current after the start is basically sinusoidal, the peak value of the current is relatively small, the sampled current calculated by the software is different due to the fact that the same current sampling algorithm is adopted by the software, under normal conditions, the ac input current calculated by the software is larger before the PFC is turned on, once the PFC circuit is turned on, the ac input current calculated by the software becomes smaller, even reaches the turn-off threshold value Ioff of the PFC circuit, causes the PFC circuit to be turned off immediately, and causes the ac input current calculated by the software to become larger, reaches the turn-on threshold value Ion of the PFC circuit, so the PFC circuit is repeatedly turned on and off many times in the immediately turned-on stage of the air conditioner, and the dc bus voltage is suddenly low, which causes bad results: because the power supply of the fan motor comes from the voltage of the direct current bus, the PFC circuit is repeatedly turned on and off, the voltage of the direct current bus correspondingly rises and falls along with the turning on and off of the PFC, and further the rotating speed of the fan motor is caused to be suddenly high or suddenly low, and the user experience is greatly influenced.
The existing solution is to return the PFC opening current threshold and the PFC closing current threshold to be poor before leaving the factory, or increase the PFC opening current threshold. However, the inventor finds that, in the process of implementing the invention, the power supply of the user is quite different, and the quality of the power grid is quite different, so that the waveform of the alternating input voltage of the user is quite different, the waveform of the corresponding alternating input current is quite different, and the alternating input current values calculated by the corresponding software are different, even if the return difference between the PFC opening current threshold and the PFC closing current threshold or the PFC opening current threshold is increased, the return difference cannot be matched with the actual input current, and the problem that the PFC circuit is repeatedly opened and closed in a short time cannot be solved well.
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 opening and closing of the PFC circuit in a short time and improve user experience.
An embodiment of the present invention provides an air conditioner, including:
a compressor;
a blower;
the output end of the PFC circuit is connected with the compressor and the fan;
a controller for:
when the input current of the air conditioner is detected to be greater than or equal to a PFC opening current threshold value, the PFC circuit is controlled to be opened until the input current of the air conditioner is detected to be less than or equal to a PFC closing current threshold value, the PFC circuit is controlled to be closed, and a first time difference between the last opening time and the current closing time of the PFC circuit is obtained;
when the preset condition is determined to be met, increasing the PFC starting current threshold by a preset increment; wherein the preset condition includes that the first time difference is smaller than a preset duration.
Compared with the prior art, the air conditioner provided by the embodiment of the invention controls the PFC circuit to be started every time the input current of the air conditioner is detected to be larger than or equal to the PFC starting current threshold, controls the PFC circuit to be started until the input current of the air conditioner is detected to be smaller than or equal to the PFC stopping current threshold, obtains the first time difference between the last starting time and the current stopping time of the PFC circuit, and increases the PFC starting current threshold by the preset increment when the preset condition at least comprising the first time difference being smaller than the preset duration is determined to be met, so that the starting current threshold of the PFC circuit is gradually increased when the PFC circuit is stopped within a short time after the PFC circuit is started, the occurrence of repeated starting and stopping of the PFC circuit within a short time is effectively reduced, the negligence of wind sound is avoided, and the user experience is improved.
As an improvement of the above solution, the controller is further configured to:
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 unchanged.
In this embodiment, when it is determined that the first time difference is greater than or equal to the preset duration, the PFC switching-on current threshold is controlled to be unchanged, so that the switching-on current threshold of the PFC circuit can be prevented from being set too large, and therefore it is ensured that the power factor meets the requirement of high-frequency operation of the air conditioner.
As an improvement of the above solution, the controller is further configured to:
acquiring a second time difference between the last turn-off time and the current turn-on time of the PFC circuit while controlling the turn-on of the PFC circuit;
wherein the preset condition further includes that the second time difference is smaller than the preset duration.
In this embodiment, the PFC circuit is controlled to be turned on, and a second time difference between a last turn-off time and a current turn-on time of the PFC circuit is obtained, and the setting of the preset condition further includes that the second time difference is smaller than the preset duration, so that the turn-on current threshold of the PFC circuit can be gradually increased 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.
As an improvement of the above solution, 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 unchanged.
In this embodiment, when it is determined that the second time difference is greater than or equal to the preset duration, the PFC switching-on current threshold is controlled to be unchanged, so that setting of the PFC circuit switching-on current threshold too large can be avoided, and it is ensured that the power factor meets the requirement of high-frequency operation of the air conditioner.
As an improvement of the above-described scheme, the PFC circuit includes:
the input end of the positive electrode of the alternating current power supply is used for connecting the positive electrode of the alternating current power supply;
the negative electrode input end of the alternating current power supply is used for connecting the negative electrode 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;
the first input end of the rectifier bridge unit is connected with the second end of the fuse, and the second input end of the rectifier bridge unit is connected with the negative 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 switching tube is connected between the second end of the inductor and the second end of the resistor, and the control end of the switching tube is connected with the controller;
the anode of the diode is connected with the second end of the inductor;
the positive output end of the power supply is connected with the negative electrode of the diode, and the positive output end of the power supply is also connected with the positive input ends of the fan and the compressor;
the negative electrode output end of the power supply is connected with the second end of the resistor, and the positive electrode output end of the power supply 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 for 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 greater than or equal to a PFC opening current threshold, controlling the PFC circuit to be opened until the input current of the air conditioner is detected to be less than or equal to a PFC closing current threshold, controlling the PFC circuit to be closed, and obtaining a first time difference between the last opening time and the current closing time of the PFC circuit;
when the preset condition is determined to be met, increasing the PFC starting current threshold by a preset increment; wherein the preset condition includes that the first time difference is smaller than a preset duration.
Compared with the prior art, the PFC circuit control method of the air conditioner controls the PFC circuit to be started every time the input current of the air conditioner is detected to be larger than or equal to the PFC starting current threshold, controls the PFC circuit to be started until the input current of the air conditioner is detected to be smaller than or equal to the PFC stopping current threshold, obtains the first time difference between the last starting time and the current stopping time of the PFC circuit, and increases the PFC starting current threshold by a preset increment when the preset condition that at least the first time difference is smaller than the preset duration is met is determined, so that the starting current threshold of the PFC circuit is gradually increased when the PFC circuit is stopped within a short time after the PFC circuit is started, the occurrence of repeated starting and stopping of the PFC circuit within a short time is effectively reduced, the wind sound is avoided, and the user experience is improved.
As an improvement of the above solution, the method further includes:
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 unchanged.
In this embodiment, when it is determined that the first time difference is greater than or equal to the preset duration, the PFC switching-on current threshold is controlled to be unchanged, so that the switching-on current threshold of the PFC circuit can be prevented from being set too large, and therefore it is ensured that the power factor meets the requirement of high-frequency operation of the air conditioner.
As an improvement of the above solution, the method further includes:
acquiring a second time difference between the last turn-off time and the current turn-on time of the PFC circuit while controlling the turn-on of the PFC circuit;
wherein the preset condition further includes that the second time difference is smaller than the preset duration.
In this embodiment, the PFC circuit is controlled to be turned on, and a second time difference between a last turn-off time and a current turn-on time of the PFC circuit is obtained, and the setting of the preset condition further includes that the second time difference is smaller than the preset duration, so that the turn-on current threshold of the PFC circuit can be gradually increased 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.
As an improvement of the above solution, the method further includes:
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 unchanged.
In this embodiment, when it is determined that the second time difference is greater than or equal to the preset duration, the PFC switching-on current threshold is controlled to be unchanged, so that setting of the PFC circuit switching-on current threshold too large can be avoided, and it is ensured that the power factor meets the requirement of high-frequency operation of the air conditioner.
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 circuit diagram of an air conditioner according to an embodiment of the present invention;
fig. 3 is a waveform diagram of an input current before a PFC circuit is turned on according to an embodiment of the present invention;
fig. 4 is a waveform diagram of an input current after a PFC circuit is turned on according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a first specific workflow of a controller of an air conditioner according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a second specific workflow of a controller of an air conditioner according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a third specific workflow of a controller of an air conditioner according to an embodiment of the present invention;
FIG. 8 is a fourth specific workflow diagram of a controller for 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 of a PFC circuit control method for an air conditioner according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific 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 explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 1, a schematic structural diagram of an air conditioner according to an embodiment of the present invention is shown.
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 the refrigeration cycle including the compressor 21 and the outdoor heat exchanger, the indoor unit 3 of the air conditioner 1 includes the 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 using the connection pipe 4 to form a refrigerant circuit for circulating a refrigerant.
The outdoor unit 2 is usually installed outdoors and is used for heat exchange in an indoor environment. In fig. 1, the outdoor unit 2 is located outdoors on the opposite side of the indoor unit 3 across the wall surface WL, and the outdoor unit 2 is indicated by a broken line.
The air conditioner 1 provided in the present embodiment is provided with a compressor 21, a condenser, an expansion valve, and an evaporator, and the refrigeration cycle of the air conditioner 1 is performed 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 a 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 may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. Throughout the cycle, the air conditioner 1 may adjust the temperature of the indoor space.
Referring to fig. 2, the air conditioner 1 provided in the present embodiment includes a fan 31, and the fan 31 is provided in the indoor unit 3. The blower 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 pipe and the indoor air.
Referring to fig. 2, the air conditioner 1 provided in this embodiment is provided with 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 blower 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, with a large peak value of current, and the input current waveform after the startup is substantially sinusoidal, as shown in fig. 4, with a relatively small peak value of current.
Referring to fig. 2, the present embodiment provides an air conditioner 1 provided with a controller 6. The controller 6 is connected with the PFC circuit 5 to obtain an input current of the air conditioner 1 and to control an operation state of the PFC circuit 5. The controller 6 is specifically configured to:
when the input current of the air conditioner 1 is detected to be greater than or equal to a PFC opening current threshold value, the PFC circuit 5 is controlled to be opened until the input current of the air conditioner 1 is detected to be less than or equal to a PFC closing current threshold value, the PFC circuit 5 is controlled to be closed, and a first time difference between the last opening time and the current closing time of the PFC circuit 5 is obtained;
when the preset condition is determined to be met, increasing the PFC starting current threshold by a preset increment; wherein the preset condition includes that the first time difference is smaller than a preset duration.
It should be noted that, the initial values of the PFC start current threshold and the PFC stop current threshold may be preset at the time of shipment, which is not limited herein. In a specific implementation, the preset increment may be set according to actual requirements, for example, may be set to 5%, 10% or the like of the initial value of the PFC start current threshold, which is not limited herein.
The first specific operation of the controller 6, as shown in connection with fig. 5, is as follows: detecting whether the input current of the air conditioner 1 is greater than or equal to a PFC on current threshold (step S11); when it is detected that the input current of the air conditioner 1 is greater than or equal to a PFC start current threshold, controlling the PFC circuit 5 to start (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 the input current of the air conditioner 1 is detected to be smaller than or equal to the PFC off current threshold, the PFC circuit 5 is controlled to be turned off, and a first time difference between the last turn-on time and the current turn-off time of the PFC circuit 5 is obtained (step S14); judging whether a preset condition is met or not, wherein the preset condition comprises that the first time difference is smaller than a preset duration (step S15); when it is determined that the preset condition is satisfied, the PFC-on current threshold is increased by a preset increment (step S16), and step S11 is returned.
Compared with the prior art, in the air conditioner 1 provided by the embodiment of the invention, when the input current of the air conditioner 1 is detected to be greater than or equal to the PFC opening current threshold, the PFC circuit 5 is controlled to be opened until the input current of the air conditioner 1 is detected to be less than or equal to the PFC closing current threshold, the PFC circuit 5 is controlled to be closed, the first time difference between the last opening time and the current closing time of the PFC circuit 5 is obtained, and then when the preset condition that at least the first time difference is less than the preset duration is determined to be met, the PFC opening current threshold is increased by a preset increment, so that the opening current threshold of the PFC circuit 5 is gradually increased when the condition that the PFC circuit 5 is closed in a very short time after being opened occurs, the condition that the PFC circuit 5 is repeatedly opened and closed in a short time is effectively reduced, the wind sound negligence is avoided, and the user experience is improved. It can be appreciated that, by adopting the embodiment, the PFC start current threshold can be furthest ensured not to be affected, that is, the PFC start current threshold is not lifted under most conditions, but only under special conditions, that is, under the condition that the PFC circuit 5 is turned off in a very short time after being turned on, the PFC start current threshold is lifted, and can be matched with the actual input current, and in a step-by-step increasing manner, the lifting amplitude is not large, the PFC start current threshold is ensured not to be too large, the reliability is ensured, only a very small current range is sacrificed, and the disqualification of the power factor is avoided.
As one of the alternative embodiments, the controller 6 is further configured to:
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 unchanged.
The second specific operation of the controller 6, as shown in connection with fig. 6, is as follows: detecting whether the input current of the air conditioner 1 is greater than or equal to a PFC on current threshold (step S11); when it is detected that the input current of the air conditioner 1 is greater than or equal to a PFC start current threshold, controlling the PFC circuit 5 to start (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 the input current of the air conditioner 1 is detected to be smaller than or equal to the PFC off current threshold, the PFC circuit 5 is controlled to be turned off, and a first time difference between the last turn-on time and the current turn-off time of the PFC circuit 5 is obtained (step S14); judging whether a preset condition is met or not, 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 opening current threshold by a preset increment (step S16), and returning to step S11; and when the first time difference is greater than or equal to the preset time period, controlling the PFC opening current threshold to be 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 duration, the PFC start current threshold is controlled to be unchanged, so that the setting of the start current threshold of the PFC circuit 5 to be too large can be avoided, and it is ensured that the power factor meets the requirement of the high-frequency operation of the air conditioner 1.
As one of the alternative embodiments, the controller 6 is further configured to:
acquiring a second time difference between the last turn-off time and the current turn-on time of the PFC circuit 5 while controlling the turn-on of the PFC circuit 5;
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, the preset condition is only determined to be satisfied when the first time difference and the second time difference are both smaller than the preset duration.
The third specific operation of the controller 6, as shown in connection with fig. 7, is as follows: detecting whether the input current of the air conditioner 1 is greater than or equal to a PFC on current threshold (step S11); when the input current of the air conditioner 1 is detected to be greater than or equal to the PFC opening current threshold, the PFC circuit 5 is controlled to be opened, and a second time difference between the last closing time and the current opening time of the PFC circuit 5 is obtained (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 the input current of the air conditioner 1 is detected to be smaller than or equal to the PFC off current threshold, the PFC circuit 5 is controlled to be turned off, and a first time difference between the last turn-on time and the current turn-off time of the PFC circuit 5 is obtained (step S14); judging whether a preset condition is met, wherein the preset condition is that the first time difference is smaller than a preset duration and the second time difference is smaller than the preset duration (step S15); when it is determined that the preset condition is satisfied, the PFC-on current threshold is increased by a preset increment (step S16), and step S11 is returned.
In this embodiment, the second time difference between the last 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 setting of the preset condition further includes that the second time difference is smaller than the preset duration, so that the turn-on current threshold of the PFC circuit 5 can be gradually increased when the PFC circuit 5 is turned off in a short time after being turned on and turned on in a short time after being turned off.
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 unchanged.
In connection with fig. 8, a fourth specific operation of the controller 6 is as follows: detecting whether the input current of the air conditioner 1 is greater than or equal to a PFC on current threshold (step S11); when the input current of the air conditioner 1 is detected to be greater than or equal to the PFC opening current threshold, the PFC circuit 5 is controlled to be opened, and a second time difference between the last closing time and the current opening time of the PFC circuit 5 is obtained (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 the input current of the air conditioner 1 is detected to be smaller than or equal to the PFC off current threshold, the PFC circuit 5 is controlled to be turned off, and a first time difference between the last turn-on time and the current turn-off time of the PFC circuit 5 is obtained (step S14); judging whether a preset condition is met, wherein the preset condition is that the first time difference is smaller than a preset duration and the second time difference is smaller than the preset duration (step S15); when the preset condition is determined to be met, increasing the PFC opening current threshold by a preset increment (step S16), and returning to step S11; when the second time difference is determined to be greater than or equal to the preset duration, the PFC opening current threshold is controlled to be unchanged (step S18), and the step S11 is returned.
In this embodiment, when the second time difference is determined to be greater than or equal to the preset duration, the PFC switching-on current threshold is controlled to be unchanged, so that the switching-on current threshold of the PFC circuit 5 can be prevented from being set too large, and thus the power factor is ensured to meet the requirement of the high-frequency operation of the air conditioner 1.
Referring to fig. 9, the PFC circuit 5 includes:
the input end of the positive electrode of the alternating current power supply is used for being connected with the positive electrode of the alternating current power supply AC;
the negative input end of the alternating current power supply is used for connecting the negative electrode of the alternating current power supply AC;
the first end of the fuse F1 is connected with the positive input end of the alternating current power supply;
the first input end of the rectifier bridge unit B1 is connected with the second end of the fuse F1, and the second input end of the rectifier bridge unit B1 is connected with the negative input end of the alternating current power supply;
a first capacitor C1, where the first capacitor C1 is connected between the first output end and the second output end of the rectifier bridge unit B1;
the first end of the inductor L1 is connected with the first output end of the rectifier bridge unit B1;
the first end of the resistor R1 is connected with the second output end of the rectifier bridge unit B1;
the switching 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 switching tube K1 is connected with the controller 6;
a diode D1, wherein the anode of the diode D1 is connected with the second end of the inductor L1;
the positive output end of the power supply is connected with the negative electrode of the diode D1, and the positive output end of the power supply is also connected with the positive input ends of the fan 31 and the compressor 21;
the negative output end of the power supply is connected with the second end of the resistor R1, and the positive output end of the power supply is also connected with the negative input ends of the fan 31 and 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 greater than or equal to a PFC opening current threshold, controlling the PFC circuit to be opened until the input current of the air conditioner is detected to be less than or equal to a PFC closing current threshold, controlling the PFC circuit to be closed, and obtaining a first time difference between the last opening time and the current closing time of the PFC circuit;
s22, when the preset condition is determined to be met, increasing the PFC starting current threshold by a preset increment; wherein the preset condition includes that the first time difference is smaller than a preset duration.
Compared with the prior art, the PFC circuit control method of the air conditioner controls the PFC circuit to be started every time the input current of the air conditioner is detected to be larger than or equal to the PFC starting current threshold, controls the PFC circuit to be started until the input current of the air conditioner is detected to be smaller than or equal to the PFC stopping current threshold, obtains the first time difference between the last starting time and the current stopping time of the PFC circuit, and increases the PFC starting current threshold by a preset increment when the preset condition that at least the first time difference is smaller than the preset duration is met is determined, so that the starting current threshold of the PFC circuit is gradually increased when the PFC circuit is stopped within a short time after the PFC circuit is started, the occurrence of repeated starting and stopping of the PFC circuit within a short time is effectively reduced, the wind sound is avoided, and the user experience is improved.
As an improvement of the above solution, the method further includes:
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 unchanged.
In this embodiment, when it is determined that the first time difference is greater than or equal to the preset duration, the PFC switching-on current threshold is controlled to be unchanged, so that the switching-on current threshold of the PFC circuit can be prevented from being set too large, and therefore it is ensured that the power factor meets the requirement of high-frequency operation of the air conditioner.
As an improvement of the above solution, the method further includes:
acquiring a second time difference between the last turn-off time and the current turn-on time of the PFC circuit while controlling the turn-on of the PFC circuit;
wherein the preset condition further includes that the second time difference is smaller than the preset duration.
In this embodiment, the PFC circuit is controlled to be turned on, and a second time difference between a last turn-off time and a current turn-on time of the PFC circuit is obtained, and the setting of the preset condition further includes that the second time difference is smaller than the preset duration, so that the turn-on current threshold of the PFC circuit can be gradually increased 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.
As an improvement of the above solution, the method further includes:
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 unchanged.
In this embodiment, when it is determined that the second time difference is greater than or equal to the preset duration, the PFC switching-on current threshold is controlled to be unchanged, so that setting of the PFC circuit switching-on current threshold too large can be avoided, and it is ensured that the power factor meets the requirement of high-frequency operation of the air conditioner.
It should be noted that the above method embodiments and the above apparatus embodiments belong to a general inventive concept, and therefore, the specific description of the above method embodiments may refer to the above apparatus embodiments, which are not repeated herein.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (9)
1. An air conditioner, comprising:
a compressor;
a blower;
the output end of the PFC circuit is connected with the compressor and the fan;
a controller for:
when the input current of the air conditioner is detected to be greater than or equal to a PFC opening current threshold value, the PFC circuit is controlled to be opened until the input current of the air conditioner is detected to be less than or equal to a PFC closing current threshold value, the PFC circuit is controlled to be closed, and a first time difference between the last opening time and the current closing time of the PFC circuit is obtained;
when the preset condition is determined to be met, the PFC opening current threshold is increased by a preset increment, the preset increment adopts a progressive increment mode, the lifting amplitude is not large, and the PFC opening current threshold is not excessively large; wherein the preset condition includes that the first time difference is smaller than a preset duration.
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 time length, controlling the PFC starting current threshold to be unchanged.
3. The air conditioner of claim 1, wherein the controller is further configured to:
acquiring a second time difference between the last turn-off time and the current turn-on time of the PFC circuit while controlling the turn-on of the PFC circuit;
wherein the preset condition further includes that the second time difference is smaller than the preset duration.
4. The air conditioner as set forth in claim 3, wherein said 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 unchanged.
5. The air conditioner of claim 1, wherein the PFC circuit comprises:
the input end of the positive electrode of the alternating current power supply is used for connecting the positive electrode of the alternating current power supply;
the negative electrode input end of the alternating current power supply is used for connecting the negative electrode 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;
the first input end of the rectifier bridge unit is connected with the second end of the fuse, and the second input end of the rectifier bridge unit is connected with the negative 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 switching tube is connected between the second end of the inductor and the second end of the resistor, and the control end of the switching tube is connected with the controller;
the anode of the diode is connected with the second end of the inductor;
the positive output end of the power supply is connected with the negative electrode of the diode, and the positive output end of the power supply is also connected with the positive input ends of the fan and the compressor;
the negative electrode output end of the power supply is connected with the second end of the resistor, and the positive electrode output end of the power supply 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.
6. The PFC circuit control method of the 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 greater than or equal to a PFC opening current threshold, controlling the PFC circuit to be opened until the input current of the air conditioner is detected to be less than or equal to a PFC closing current threshold, controlling the PFC circuit to be closed, and obtaining a first time difference between the last opening time and the current closing time of the PFC circuit;
when the preset condition is determined to be met, the PFC opening current threshold is increased by a preset increment, the preset increment adopts a progressive increment mode, the lifting amplitude is not large, and the PFC opening current threshold is not excessively large; wherein the preset condition includes that the first time difference is smaller than a preset duration.
7. The PFC circuit control method of an air conditioner according to claim 6, further comprising:
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 unchanged.
8. The PFC circuit control method of an air conditioner according to claim 6, further comprising:
acquiring a second time difference between the last turn-off time and the current turn-on time of the PFC circuit while controlling the turn-on of the PFC circuit;
wherein the preset condition further includes that the second time difference is smaller than the preset duration.
9. The PFC circuit control method of an air conditioner according to 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 unchanged.
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