CN115950076A - Air conditioner and control method thereof - Google Patents

Abstract

The invention discloses an air conditioner and a control method thereof, wherein the air conditioner comprises: casing, refrigerant circulation circuit, multichannel PFC circuit and controller, the controller is configured as: the method comprises the steps of acquiring operation parameters of an air conditioner power supply in real time when the air conditioner is started to operate; when the condition for opening the PFC channels is judged to be met, acquiring a first opening time length corresponding to the last opening operation of all the PFC channels in the closed state and a closing time length corresponding to the last channel closing operation, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening time length and the closing time length; when the condition of closing the PFC channels is judged to be met, the corresponding second opening time length of all the PFC channels in the opening state during the current opening operation is obtained, one PFC channel in the PFC channels in the opening state is controlled to be closed according to the second opening time length, the temperature rise of electronic components in the PFC channels is reduced, and the service lives of the electronic components are prolonged.

Description

Air conditioner and control method thereof

Technical Field

The invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method thereof.

Background

A PFC (Power Factor Correction) control circuit is an indispensable part of an air conditioner inverter, and for a single-phase electric high-Power air conditioner, a single-path PFC control circuit is often difficult to solve the temperature rise problem due to an excessive current, so that the high-Power air conditioner is more and more prone to use staggered PFCs, such as two-path or three-path staggered PFCs.

In the prior art, no matter two-way or three-way interleaved PFCs control each way of triodes according to a preset sequence, if the power or current is greater than 500W, a first PFC channel is opened, if the power or current is greater than 1000W, a second PFC channel is opened, and if the power or current is greater than 2000W, a third PFC channel is opened; when the PFC channel is closed, the third PFC channel is also closed when the Power Factor Correction (PFC) channel is lower than 2000W, and the like, the first IGBT of the method is used at the highest frequency and is often high in temperature rise, and the third triode is often used only when the power factor is at the maximum power and is low in use frequency, namely the prior art cannot reduce the temperature rise of a single electronic component and balance the use frequency of the component, so that the service life of the electronic component is short, how to reduce the temperature rise of the electronic component in the PFC channel is reduced, and the service life of the electronic component is improved.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. To this end, an object of the present invention is to provide an air conditioner and a control method thereof.

The invention provides an air conditioner, comprising: a housing; the refrigerant circulation loop enables a refrigerant to carry out refrigeration circulation in a loop formed by a compressor, a condenser, an electronic expansion valve and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger, and the other one is an indoor heat exchanger; the multi-channel PFC circuit is connected between a power supply input end and a power supply output end of the air conditioner in parallel, comprises a plurality of PFC channels which are connected in parallel and used for correcting the input current waveform of the air conditioner and detecting the input current of the air conditioner; the controller is configured to: when the air conditioner is started and operated, acquiring operation parameters of a power supply of the air conditioner in real time, and judging whether the conditions for opening or closing the PFC channel are met or not according to the operation parameters; when the condition for opening the PFC channels is judged to be met, acquiring first opening time lengths corresponding to all PFC channels in a closed state when the PFC channels are opened and operated last time and closing time lengths corresponding to all the PFC channels in a distance from the PFC channels closed last time, and controlling one PFC channel in the PFC channels in a closed state to be opened according to the first opening time lengths and the closing time lengths; and when the condition of closing the PFC channels is judged to be met, acquiring a second opening time corresponding to the current opening operation of all the PFC channels in the opening state, and controlling one PFC channel in the PFC channels in the opening state to be closed according to the second opening time.

In addition, the air conditioner according to the embodiment of the invention can also have the following additional technical characteristics:

further, when one of the PFC channels in the off state is controlled to be on according to the first on-period and the off-period, the controller is configured to: judging whether the closing time lengths are the same or not; when the closing time length is judged to be the same, controlling one of the PFC channels in the closing state to be opened according to the first opening time length; and when the closing time lengths are judged to be different, controlling the PFC channel corresponding to the longest closing time length to be opened.

Further, in determining whether the off-period is the same, the controller is configured to: when the difference value between the closing time lengths corresponding to different PFC channels in the closing state does not exceed a first preset difference value, judging that the closing time lengths are the same; and when the difference value between the closing time lengths corresponding to different PFC channels in the closing state exceeds the first preset difference value, judging that the closing time lengths are different.

Further, when one of the PFC channels in the off state is controlled to be on according to the first on-period, the controller is configured to: judging whether the first starting time lengths are the same or not; when the first opening time lengths are judged to be the same, controlling any one PFC channel in the PFC channels in the closed state to be opened; and when the first starting time lengths are judged to be different, controlling the PFC channel corresponding to the shortest first starting time length to be started.

Further, in determining whether the first on-time period is the same, the controller is configured to: when the difference value between the first starting time lengths corresponding to different PFC channels in the closed state does not exceed a second preset difference value, judging that the first starting time lengths are the same; and when the difference value between the first opening time lengths corresponding to the different PFC channels in the closed state exceeds the second preset difference value, judging that the first opening time lengths are different.

Further, when one of the PFC channels in the on state is controlled to be closed according to the second on period, the controller is configured to: and controlling the PFC channel corresponding to the longest second opening time period to be closed.

Further, when the PFC channel corresponding to the longest off duration, or the PFC channel corresponding to the shortest first on duration, or the PFC channel corresponding to the longest second on duration is not unique, the controller is configured to: selecting any one of the PFC channels corresponding to the longest closing time as the PFC channel corresponding to the longest closing time; or selecting any one of the PFC channels corresponding to the shortest first starting time as the PFC channel corresponding to the shortest first starting time; or selecting any one of the PFC channels corresponding to the longest second starting time length as the PFC channel corresponding to the longest second starting time length.

Further, when determining whether a condition for turning on or off the PFC channel is satisfied according to the operating parameter, the controller is configured to: when the operation parameter is larger than a preset value, judging that the condition for opening the PFC channel is met; and when the operation parameter is not greater than the preset value, judging that the condition for closing the PFC channel is met.

Further, the operating parameter includes at least one of an input power, an output power, and an input current.

According to the air conditioner provided by the embodiment of the invention, when the air conditioner is started to operate, the operation parameters of the power supply of the air conditioner are obtained in real time, and whether the conditions for opening or closing the PFC channel are met or not is judged according to the operation parameters; when the condition for opening the PFC channels is judged to be met, acquiring a first opening time length corresponding to the last opening operation of all the PFC channels in the closed state and a closing time length corresponding to the last channel closing operation, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening time length and the closing time length; when the condition of closing the PFC channels is judged to be met, second opening time corresponding to the current opening operation of all the PFC channels in the opening state is obtained, one PFC channel in the PFC channels in the opening state is controlled to be closed according to the second opening time, the temperature rise of electronic components in the PFC channels can be reduced, the use frequency of the electronic components is balanced, and therefore the service life of the electronic components is prolonged.

In view of the above problems, the present invention further provides a control method of an air conditioner, which is used for the air conditioner according to any of the above embodiments, and the method includes the following steps: the method comprises the steps of acquiring operation parameters of an air conditioner power supply in real time when the air conditioner is started to operate; judging whether the conditions for opening or closing the PFC channel are met or not according to the operation parameters; when the condition of opening the PFC channels is judged to be met, acquiring a first opening time length corresponding to the last opening operation of all the PFC channels in the closed state and a closing time length corresponding to the last channel closing operation, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening time length and the closing time length; and when the condition of closing the PFC channels is judged to be met, acquiring a second opening time corresponding to the current opening operation of all the PFC channels in the opening state, and controlling one PFC channel in the PFC channels in the opening state to be closed according to the second opening time.

According to the control method of the air conditioner, when the air conditioner is started to operate, the operation parameters of the power supply of the air conditioner are obtained in real time, and whether the conditions for opening or closing the PFC channel are met or not is judged according to the operation parameters; when the condition for opening the PFC channels is judged to be met, acquiring a first opening time length corresponding to the last opening operation of all the PFC channels in the closed state and a closing time length corresponding to the last channel closing operation, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening time length and the closing time length; when the condition of closing the PFC channels is judged to be met, the second opening time length corresponding to the current opening operation of all the PFC channels in the opening state is obtained, one PFC channel in the PFC channels in the opening state is controlled to be closed according to the second opening time length, the temperature rise of electronic components in the PFC channels can be reduced, the use frequency of the components is balanced, and therefore the service life of the electronic components is prolonged.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of an air conditioner according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a three-channel PFC circuit topology according to one embodiment of the present invention;

fig. 3 is a flowchart for controlling one of the PFC channels in the off state to be turned on according to a first turn-on duration and a turn-off duration according to an embodiment of the present invention;

FIG. 4 is a flowchart of determining whether the turn-off durations are the same according to one embodiment of the invention;

fig. 5 is a flowchart for controlling one of the PFC channels in the off state to be turned on according to a first turn-on duration according to an embodiment of the present invention;

FIG. 6 is a flowchart of determining whether first ON durations are the same according to one embodiment of the invention;

fig. 7 is a flowchart of determining whether a condition for turning on or off a PFC channel is satisfied according to an operation parameter according to an embodiment of the present invention;

fig. 8 is a flowchart of a control method of 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

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.

The air conditioner of the present invention performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an electronic expansion valve, and an 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 compresses a 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 electronic 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 electronic expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. 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 can adjust the temperature of the indoor space throughout the cycle.

The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and the electronic expansion valve may be provided in the indoor unit or the outdoor unit.

The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.

An air conditioner and a control method thereof according to an embodiment of the present invention will be described with reference to fig. 1 to 8.

Fig. 1 is a schematic structural view of an air conditioner according to an embodiment of the present invention. As shown in fig. 1, an air conditioner includes: the multi-channel PFC circuit comprises a shell 10, a refrigerant circulation loop 20, a multi-channel PFC circuit 30 and a controller 40. The refrigerant circulation loop 20 makes the refrigerant perform refrigeration cycle in a loop formed by a compressor, a condenser, an electronic expansion valve and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger, and the other one is an indoor heat exchanger; the multi-channel PFC circuit 30 is connected in parallel between a power input end and a power output end of the air conditioner, and the multi-channel PFC circuit 30 comprises a plurality of PFC channels which are connected in parallel and used for correcting the input current waveform of the air conditioner and detecting the input current of the air conditioner; the controller 40 is configured to: when the air conditioner is started and operated, acquiring operation parameters of a power supply of the air conditioner in real time, and judging whether the conditions for opening or closing a PFC channel are met or not according to the operation parameters; when the condition for opening the PFC channels is judged to be met, acquiring first opening time lengths corresponding to all PFC channels in a closed state when the PFC channels are opened and operated last time and closing time lengths corresponding to all the PFC channels in a distance from the PFC channels closed last time, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening time lengths and the closing time lengths; and when the condition of closing the PFC channels is judged to be met, acquiring a second opening time length corresponding to the current opening operation of all the PFC channels in the opening state, and controlling one PFC channel in the PFC channels in the opening state to be closed according to the second opening time length.

Specifically, the air conditioner, especially the variable frequency air conditioner, has a wide working range, and after the air conditioner is started to operate, the number of the PFC channels to be started needs to be adjusted in real time according to the operation parameters of the power supply of the air conditioner, so that unnecessary opening of the PFC channels is reduced, the loss of electronic components in the PFC channels is reduced, and the efficiency of the air conditioner and the energy efficiency of the whole air conditioner are improved. When the PFC channel is in a closed state, the longer the corresponding closing time from the last time of closing the PFC channel is, the larger the temperature reduction of an electronic component, particularly a power device, in the PFC channel is, and the working life of the electronic component is related to the first opening time during the last time of opening the PFC channel, so that when the condition of opening the PFC channel is judged to be met, one PFC channel in the closed state can be controlled to be opened according to the first opening time corresponding to the last time of opening the PFC channel in the closed state and the corresponding closing time from the last time of closing the PFC channel. Similarly, when the condition of closing the PFC channels is judged to be satisfied, in order to balance the working time of the electronic components in each PFC channel and improve the working life of the electronic components, the embodiment of the present invention controls one of the PFC channels in the open state to close according to the second opening duration corresponding to the current opening operation of all the PFC channels in the open state. Therefore, on the basis of not changing the staggered PFC topological structure, when PFC channels need to be opened or closed, the embodiment of the invention controls one PFC channel in the closed PFC channel to be opened or one PFC channel in the opened PFC channel to be closed by distributing the operation time of each PFC channel, so that the temperature rise of a single electronic component is reduced, the use frequency of the component is balanced, and the service life of the electronic component is prolonged.

In the specific embodiment, a three-channel PFC circuit is taken as an example to describe the turning on or off of the PFC channel implemented by the present invention. As shown in fig. 2, the multi-channel PFC circuit 30 includes three PFC channels connected in parallel, where the first channel includes a first inductor L1, a first transistor IGBT1, a first diode D1, and a first resistor R1, the second channel includes a second inductor L2, a second transistor IGBT2, a second diode D2, and a second resistor R2, the third channel includes a third inductor L3, a third transistor IGBT3, a third diode D3, and a third resistor R3, and each PFC channel controls the channel to be turned on and off by a transistor connected to the controller 40.

In an embodiment of the present invention, as shown in fig. 3, when one of the PFC channels in the off state is controlled to be turned on according to the first on-duration and the off-duration, the controller 40 is specifically configured to: judging whether the closing time lengths are the same; when the closing time lengths are judged to be the same, controlling one PFC channel in the closed PFC channels to be opened according to the first opening time length; and when the closing time lengths are judged to be different, controlling the PFC channel corresponding to the longest closing time length to be opened.

Specifically, when the PFC channel is controlled to be opened, the temperature rise of the PFC channel in the closed state is considered to be smaller as the corresponding closing time length of the PFC channel in the closed state is longer than that of the PFC channel closed last time, and at the moment, the PFC channel corresponding to the longest closing time length is controlled to be opened, so that the temperature rise of the electronic component can be effectively reduced, and the service life of the electronic component is prolonged; when the closing time lengths are the same, one of the PFC channels in the closed state is controlled to be opened according to the first opening time length, namely the opening time length corresponding to the last time of opening operation, so that the working time of electronic components in each PFC channel can be balanced, and the service life of the electronic components is prolonged.

In a specific embodiment, after the air conditioner is started and operated, if a condition for starting the PFC channels is met, one PFC channel is started, at this time, one PFC channel which has stopped working time, that is, has the longest closing time, among all the PFC channels in the closed state is started preferentially, and if the closing time of all the PFC channels is the same, one PFC channel is controlled to be started according to the last operation time of all the PFC channels in the closed state. After one PFC channel is started, if the power or current of the air conditioner continues to rise and the condition of starting the second PFC channel is met, the method for starting the second PFC channel is the same as the method for starting the first PFC channel, namely, one PFC channel which stops working time in the rest PFC channels in the closed state and has the longest closing time is started preferentially, and if the closing time of the rest PFC channels in the closed state is the same, one PFC channel is controlled to be started according to the running time of the rest PFC channels in the closed state last time. By analogy, when the condition of opening the third PFC channel is satisfied, the method of opening the third PFC channel is the same as the method of opening the first PFC channel, which is not described herein again.

In an embodiment of the present invention, as shown in fig. 4, when determining whether the closing time periods are the same, the controller 40 is specifically configured to: when the difference value between the closing time lengths corresponding to different PFC channels in the closing state does not exceed a first preset difference value, judging that the closing time lengths are the same; and when the difference value between the closing time lengths corresponding to different PFC channels in the closing state exceeds a first preset difference value, judging that the closing time lengths are different.

Specifically, in order to further improve the service life of the electronic components and balance the working time of the electronic components in each PFC channel, in the embodiment of the present invention, a first preset difference value, for example, 10min, is set when determining whether the turn-off durations are the same, and whether the turn-off durations are the same is determined by comparing the difference value between the turn-off durations corresponding to different PFC channels in the turn-off state with the first preset difference value. It can be understood that the first preset difference may be determined according to experiments to ensure that each PFC channel has a longer service life, which is not described herein.

In a specific embodiment, a difference between the closing time of the first PFC channel and the closing time of the second PFC channel is, for example, 5min, and the difference between the closing time of the first PFC channel and the closing time of the second PFC channel is smaller than a first preset difference, so that the closing time of the first PFC channel is the same as the closing time of the second PFC channel, so as to increase a probability that the closing time of all the PFC channels in the closed state is the same, and thus when the closing time of all the PFC channels in the closed state is the same, one of the PFC channels in the closed state is controlled to be opened according to the first opening time.

In an embodiment of the present invention, as shown in fig. 5, when one of the PFC channels in the off state is controlled to be turned on according to the first on duration, the controller 40 is specifically configured to: judging whether the first starting time lengths are the same or not; when the first opening time lengths are judged to be the same, controlling any one PFC channel in the closed PFC channels to be opened; and when the first starting time lengths are judged to be different, controlling the PFC channel corresponding to the shortest first starting time length to be started.

Specifically, when the first opening duration is the same, the working time of all the PFC channels in the closed state is considered to be the same, and any one of the PFC channels in the closed state is controlled to be opened; when the first starting time lengths are different, the PFC channel corresponding to the shortest first starting time length is controlled to be started, and the working time of the PFC channel can be prolonged, so that the working time of each PFC channel is balanced, and the working life of the electronic components is prolonged. In an embodiment, when the first on durations are the same, one of the PFC channels in the off state may be randomly selected by a random number to be turned on.

In an embodiment of the present invention, as shown in fig. 6, when determining whether the first opening time periods are the same, the controller 40 is specifically configured to: when the difference value between the first opening time lengths corresponding to different PFC channels in the closed state does not exceed a second preset difference value, judging that the first opening time lengths are the same; and when the difference value between the first opening time lengths corresponding to different PFC channels in the closed state exceeds a second preset difference value, judging that the first opening time lengths are different.

Specifically, in order to further improve the service life of the electronic components and balance the working time of the electronic components in each PFC channel, in the embodiment of the present invention, a second preset difference value is set, for example, 5min, when determining whether the first opening time lengths are the same, and whether the first opening time lengths are the same is determined by comparing the difference value between the first opening time lengths corresponding to the last time when all the PFC channels in the closed state are opened and operated with the second preset difference value. It can be understood that the second preset difference value can be determined according to experiments to ensure that each PFC channel has a longer service life, which is not described herein.

In a specific embodiment, a difference between the first opening time of the first PFC channel and the first opening time of the second PFC channel is, for example, 3min, and the difference between the first opening time of the first PFC channel and the first opening time of the second PFC channel is smaller than a second preset difference, so that the first opening time of the first PFC channel is the same as the first opening time of the second PFC channel to increase a probability that the first opening times of all the PFC channels in the closed state are the same, and thus when the first opening times of all the PFC channels in the closed state are the same, any one of the PFC channels in the closed state is controlled to be opened.

In an embodiment of the present invention, when controlling one of the PFC channels in the on state to be turned off according to the second on duration, the controller 40 is specifically configured to: and controlling the PFC channel corresponding to the longest second opening time period to be closed.

Specifically, when the PFC channels are controlled to be closed, the longer the second opening time corresponding to all the PFC channels in the open state is, the longer the working time is, and at this time, the PFC channel corresponding to the longest second opening time is controlled to be closed, so that the temperature rise of the electronic components in the PFC channels can be effectively reduced, and the working life of the electronic components can be prolonged.

In a specific embodiment, after the air conditioner is started and operated, if a condition for closing the PFC channel is satisfied, one PFC channel is closed, and at this time, the PFC channel having the longest operation time is closed. After one PFC channel is closed, if the power or current of the air conditioner continues to drop and the condition of closing the second PFC channel is met, the method for closing the second PFC channel is the same as the method for closing the first PFC channel, namely, the PFC channel with the longest running time in the remaining PFC channels in the opening state is closed, and if the running times of the remaining PFC channels in the opening state are the same, any one PFC channel in the remaining PFC channels in the opening state is controlled to be closed. By analogy, when the condition of closing the third PFC channel is satisfied, the method of closing the third PFC channel is the same as the method of closing the first PFC channel, which is not described herein again.

In an embodiment of the present invention, when the PFC channel corresponding to the longest off duration, or the PFC channel corresponding to the shortest first on duration, or the PFC channel corresponding to the longest second on duration is not unique, the controller 40 is specifically configured to: selecting any one of the PFC channels corresponding to the longest closing time as the PFC channel corresponding to the longest closing time; or selecting any one of the PFC channels corresponding to the shortest first starting time as the PFC channel corresponding to the shortest first starting time; or, any one of the PFC channels corresponding to the longest second on-time is selected as the PFC channel corresponding to the longest second on-time.

Specifically, when the PFC channels corresponding to the longest closing time period are not unique, the temperature rises of the PFC channels corresponding to the longest closing time periods are considered to be the same, and when the PFC channel corresponding to the shortest first opening time period or the PFC channel corresponding to the longest second opening time period is not unique, the PFC channels corresponding to the shortest first opening time periods or the PFC channels corresponding to the longest second opening time periods are considered to be the same, and which PFC channel may be selected correspondingly. At this time, any one of the PFC channels corresponding to the longest closing time length is selected as the PFC channel corresponding to the longest closing time length; or selecting any one of the PFC channels corresponding to the shortest first starting time as the PFC channel corresponding to the shortest first starting time; or, any one of the PFC channels corresponding to the longest second turn-on duration may be selected as the PFC channel corresponding to the longest second turn-on duration.

In an embodiment of the present invention, as shown in fig. 7, when determining whether a condition for turning on or off the PFC channel is satisfied according to the operation parameter, the controller 40 is specifically configured to: when the operation parameter is larger than a preset value, judging that the condition for opening the PFC channel is met; and when the operation parameter is not more than a preset value, judging that the condition of closing the PFC channel is met.

Specifically, the operation parameter of the air conditioner includes at least one of input power, output power and input current, and the larger the operation parameter of the air conditioner is, the larger the number of PFC channels needs to be opened. In a specific embodiment, at least one of the input power, the output power and the input current of the air conditioner can be obtained in real time, so that the number of the PFC channels to be switched on can be adjusted in real time according to the input power, the output power and the input current of the air conditioner. Specifically, the current in the channel may be sampled through a resistor in the channel, and the input current of the air conditioner may be calculated through the current of each channel, or may be estimated through the dc bus current. It should be noted that calculating the input current of the air conditioner through the current of each channel or estimating the input current of the air conditioner through the current of the dc bus, and calculating the input power and the output power according to the input current or the output current are prior art, and will not be described herein.

In a specific embodiment, the operation parameter of the air conditioner is, for example, input power, and the preset input power value includes, for example, 500W, 1000W, 2000W, when the input power is greater than 500W, it is determined that a condition for opening the PFC channel is satisfied, and one PFC channel is opened, and when the input power of the air conditioner continues to rise and reaches 1000W, it is determined that the condition for opening the PFC channel is satisfied, and then a second PFC channel is opened; or when the input power of the air conditioner is reduced, judging that the condition of closing the PFC channel is met, and closing one PFC channel.

According to the air conditioner disclosed by the embodiment of the invention, when the air conditioner is started to operate, the operating parameters of the power supply of the air conditioner are obtained in real time, and whether the conditions for opening or closing the PFC channel are met or not is judged according to the operating parameters; when the condition for opening the PFC channels is judged to be met, acquiring a first opening time length corresponding to the last opening operation of all the PFC channels in the closed state and a closing time length corresponding to the last channel closing operation, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening time length and the closing time length; when the condition of closing the PFC channels is judged to be met, the second opening time length corresponding to the current opening operation of all the PFC channels in the opening state is obtained, one PFC channel in the PFC channels in the opening state is controlled to be closed according to the second opening time length, the temperature rise of electronic components in the PFC channels can be reduced, the use frequency of the components is balanced, and therefore the service life of the electronic components is prolonged.

A further embodiment of the present invention further discloses a control method of an air conditioner, which is used for the air conditioner according to any one of the above embodiments, and as shown in fig. 8, the method includes the following steps:

s1, acquiring operation parameters of an air conditioner power supply in real time when the air conditioner is started to operate;

s2, judging whether the conditions for opening or closing the PFC channel are met or not according to the operation parameters;

s3, when the condition of opening the PFC channels is judged to be met, acquiring a first opening time length corresponding to the last opening operation of all the PFC channels in the closed state and a closing time length corresponding to the last channel closing time, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening time length and the closing time length;

and S4, when the condition of closing the PFC channels is judged to be met, acquiring second opening time lengths corresponding to the current opening operation of all the PFC channels in the opening state, and controlling one PFC channel in the PFC channels in the opening state to be closed according to the second opening time lengths.

In an embodiment of the present invention, controlling one of the PFC channels in the off state to be on according to the first on-time and the off-time includes: judging whether the closing time lengths are the same; when the closing time lengths are judged to be the same, controlling one PFC channel in the closed PFC channels to be opened according to the first opening time length; and when the closing time lengths are judged to be different, controlling the PFC channel corresponding to the longest closing time length to be opened.

In an embodiment of the present invention, determining whether the turn-off durations are the same includes: when the difference value between the closing time lengths corresponding to different PFC channels in the closing state does not exceed a first preset difference value, judging that the closing time lengths are the same; and when the difference value between the closing time lengths corresponding to different PFC channels in the closing state exceeds a first preset difference value, judging that the closing time lengths are different.

In an embodiment of the present invention, controlling one of the PFC channels in the off state to be turned on according to a first turn-on duration includes: judging whether the first opening duration is the same or not; when the first opening duration is judged to be the same, controlling any one PFC channel in the closed PFC channels to be opened; and when the first starting time lengths are judged to be different, controlling the PFC channel corresponding to the shortest first starting time length to be started.

In an embodiment of the present invention, determining whether the first opening durations are the same includes: when the difference value between the first starting time lengths corresponding to different PFC channels in the closed state does not exceed a second preset difference value, judging that the first starting time lengths are the same; and when the difference value between the first opening time lengths corresponding to different PFC channels in the closed state exceeds a second preset difference value, judging that the first opening time lengths are different.

In an embodiment of the present invention, controlling one of the PFC channels in the on state to be turned off according to the second on duration includes: and controlling the PFC channel corresponding to the longest second opening time period to be closed.

In an embodiment of the present invention, when the PFC channel corresponding to the longest closing time, or the PFC channel corresponding to the shortest first opening time, or the PFC channel corresponding to the longest second opening time is not unique, any one of the PFC channels corresponding to the longest closing time is selected as the PFC channel corresponding to the longest closing time; or selecting any one of the PFC channels corresponding to the shortest first starting time as the PFC channel corresponding to the shortest first starting time; or, any one of the PFC channels corresponding to the longest second on-time is selected as the PFC channel corresponding to the longest second on-time.

In an embodiment of the present invention, controlling one of the PFC channels in the on state to be turned off according to the second on duration includes: when the operation parameter is larger than a preset value, judging that the condition for opening the PFC channel is met; and when the operation parameter is not greater than a preset value, judging that the condition for closing the PFC channel is met.

In one embodiment of the invention, the operating parameter comprises at least one of input power, output power and input current.

It should be noted that, when the air conditioner according to the embodiment of the present invention is controlled, a specific implementation manner of the air conditioner is similar to a specific implementation manner of the control method of the controller of the air conditioner according to the embodiment of the present invention, please refer to the description of the method part specifically, and details are not described here for reducing redundancy.

According to the control method of the air conditioner, when the air conditioner is started to operate, the operation parameters of the power supply of the air conditioner are obtained in real time, and whether the conditions for opening or closing the PFC channel are met or not is judged according to the operation parameters; when the condition for opening the PFC channels is judged to be met, acquiring a first opening time length corresponding to the last opening operation of all the PFC channels in the closed state and a closing time length corresponding to the last channel closing operation, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening time length and the closing time length; when the condition of closing the PFC channels is judged to be met, second opening time corresponding to the current opening operation of all the PFC channels in the opening state is obtained, one PFC channel in the PFC channels in the opening state is controlled to be closed according to the second opening time, the temperature rise of electronic components in the PFC channels can be reduced, the use frequency of the electronic components is balanced, and therefore the service life of the electronic components is prolonged.

In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. An air conditioner, comprising:

a housing;

the refrigerant circulation loop enables a refrigerant to carry out refrigeration circulation in a loop formed by a compressor, a condenser, an electronic expansion valve and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger, and the other one is an indoor heat exchanger;

the multi-channel PFC circuit is connected between a power supply input end and a power supply output end of the air conditioner in parallel, comprises a plurality of PFC channels which are connected in parallel and used for correcting the input current waveform of the air conditioner and detecting the input current of the air conditioner;

the controller is configured to: when the air conditioner is started and operated, acquiring operation parameters of a power supply of the air conditioner in real time, and judging whether the conditions for opening or closing the PFC channel are met or not according to the operation parameters;

when the condition of opening the PFC channels is judged to be met, acquiring a first opening time length corresponding to the last opening operation of all the PFC channels in the closed state and a closing time length corresponding to the last channel closing operation, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening time length and the closing time length;

and when the condition of closing the PFC channels is judged to be met, acquiring a second opening time corresponding to the current opening operation of all the PFC channels in the opening state, and controlling one PFC channel in the PFC channels in the opening state to be closed according to the second opening time.

2. The air conditioner according to claim 1, wherein when one of the PFC channels in the off state is controlled to be on according to the first on period and the off period, the controller is configured to:

judging whether the closing time lengths are the same or not;

when the closing time lengths are judged to be the same, controlling one of the PFC channels in the closing state to be opened according to the first opening time length;

and when the closing time lengths are judged to be different, controlling the PFC channel corresponding to the longest closing time length to be opened.

3. The air conditioner according to claim 2, wherein, in determining whether the off period is the same, the controller is configured to:

when the difference value between the closing time lengths corresponding to different PFC channels in the closing state does not exceed a first preset difference value, judging that the closing time lengths are the same;

and when the difference value between the closing time lengths corresponding to different PFC channels in the closing state exceeds the first preset difference value, judging that the closing time lengths are different.

4. The air conditioner according to claim 2, wherein when controlling one of the PFC channels in the off state to be on according to the first on period, the controller is configured to:

judging whether the first starting time lengths are the same or not;

when the first opening time lengths are judged to be the same, controlling any one PFC channel in the PFC channels in the closed state to be opened;

and when the first starting time lengths are judged to be different, controlling the PFC channel corresponding to the shortest first starting time length to be started.

5. The air conditioner according to claim 4, wherein, in determining whether the first on period is the same, the controller is configured to:

when the difference value between the first opening time lengths corresponding to different PFC channels in the closed state does not exceed a second preset difference value, judging that the first opening time lengths are the same;

and when the difference value between the first opening time lengths corresponding to different PFC channels in the closed state exceeds the second preset difference value, judging that the first opening time lengths are different.

6. The air conditioner according to claim 4, wherein when controlling one of the PFC channels in an on state to be off according to the second on-period, the controller is configured to:

and controlling the PFC channel corresponding to the longest second opening time period to be closed.

7. The air conditioner of claim 6, wherein when the PFC channel corresponding to a longest off duration, or the PFC channel corresponding to a shortest first on duration, or the PFC channel corresponding to a longest second on duration is not unique, the controller is configured to:

selecting any one of the PFC channels corresponding to the longest closing time as the PFC channel corresponding to the longest closing time; alternatively, the first and second liquid crystal display panels may be,

selecting any one of the PFC channels corresponding to the shortest first starting time as the PFC channel corresponding to the shortest first starting time; alternatively, the first and second electrodes may be,

and selecting any one of the PFC channels corresponding to the longest second starting time as the PFC channel corresponding to the longest second starting time.

8. The air conditioner according to claim 1, wherein when determining whether a condition for turning on or off the PFC channel is satisfied according to the operation parameter, the controller is configured to:

when the operation parameter is larger than a preset value, judging that the condition for opening the PFC channel is met;

and when the operation parameter is not greater than the preset value, judging that the condition for closing the PFC channel is met.

9. The air conditioner of claim 8, wherein the operating parameter comprises at least one of input power, output power, and input current.

10. A control method of an air conditioner, for the air conditioner according to any one of claims 1 to 9, comprising the steps of:

the method comprises the steps of acquiring operation parameters of an air conditioner power supply in real time when the air conditioner is started to operate;

judging whether the operating parameters meet the conditions for opening or closing the PFC channel;

when the condition for opening the PFC channels is judged to be met, acquiring first opening time lengths corresponding to all PFC channels in a closed state when the PFC channels are opened and operated last time and closing time lengths corresponding to all the PFC channels in a distance from the PFC channels closed last time, and controlling one PFC channel in the PFC channels in a closed state to be opened according to the first opening time lengths and the closing time lengths;

and when the condition of closing the PFC channels is judged to be met, acquiring a second opening time corresponding to the current opening operation of all the PFC channels in the opening state, and controlling one PFC channel in the PFC channels in the opening state to be closed according to the second opening time.

Images