CN115950076B - Air conditioner and control method thereof - Google Patents
Air conditioner and control method thereof Download PDFInfo
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- CN115950076B CN115950076B CN202310102410.6A CN202310102410A CN115950076B CN 115950076 B CN115950076 B CN 115950076B CN 202310102410 A CN202310102410 A CN 202310102410A CN 115950076 B CN115950076 B CN 115950076B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000003507 refrigerant Substances 0.000 claims abstract description 18
- 238000005057 refrigeration Methods 0.000 claims description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 11
- 239000007791 liquid phase Substances 0.000 description 3
- 229920006926 PFC Polymers 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses an air conditioner and a control method thereof, wherein the air conditioner comprises: the system comprises a shell, a refrigerant circulation loop, a multi-channel PFC circuit and a controller, wherein the controller is configured to: when the air conditioner is started to operate, acquiring the operating parameters of the power supply of the air conditioner in real time; when judging that the condition for opening the PFC channels is met, acquiring a first opening duration corresponding to the last opening operation of all the PFC channels in a closed state and a closing duration corresponding to the last closing time of the PFC channels, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening duration and the closing duration; when judging that the condition of closing the PFC channels is met, acquiring a second opening time length corresponding to all the PFC channels in the opening state when the PFC channels are opened and run this time, and controlling one PFC channel in the PFC channels in the opening state to be closed according to the second opening time length, so that the temperature rise of electronic components in the PFC channels is reduced, and the service life of the electronic components is prolonged.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner and a control method thereof.
Background
PFC (Power Factor Correction ) control circuits are an indispensable part of air conditioner frequency converters, and for single-phase electric high-power air conditioners, single-path PFC control circuits often have difficulty in solving the problem of temperature rise due to the problem of excessive current, so that high-power air conditioners are increasingly prone to using interleaved PFCs, such as two-path or three-path interleaved PFCs.
In the prior art, two-way or three-way staggered PFC controls all the triodes according to a preset sequence, for example, a first PFC channel is opened after the power or the current is more than 500W, a second PFC channel is opened after the power or the current is more than 1000W, and a third PFC channel is opened after the power or the current is more than 2000W; when the PFC channel is closed, a third PFC channel is also closed when the Power Factor Correction (PFC) channel is lower than 2000W, the frequency of the first IGBT of the method is highest, the temperature rise is high, the third triode can be used only when the power is maximum, the frequency of the third triode is low, namely the prior art cannot reduce the temperature rise of a single electronic component and the frequency of using an equalizing device, so that the service life of the electronic component is short, and the problem of how to reduce the temperature rise of the electronic component in the PFC channel and improve the service life of the electronic component is needed to be solved.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in 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; a refrigerant circulation loop, wherein the refrigerant is subjected to refrigeration circulation in a loop formed by a compressor, a condenser, an electronic expansion valve and an evaporator, one of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger; the multi-channel PFC circuit is connected in parallel between a power input end and a power output end of the air conditioner and 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 to operate, acquiring the operation parameters of the power supply of the air conditioner in real time, and judging whether the conditions for starting or closing the PFC channel are met according to the operation parameters; when judging that the condition for opening the PFC channels is met, acquiring a first opening duration corresponding to the last opening operation of all the PFC channels in a closed state and a closing duration corresponding to the last closing operation of the PFC channels, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening duration and the closing duration; when judging that the condition for closing the PFC channels is met, acquiring a second opening duration corresponding to all the PFC channels in the opening state when the PFC channels are opened and operated this time, and controlling one PFC channel in the opening state to be closed according to the second opening duration.
In addition, the air conditioner according to the embodiment of the invention can also have the following additional technical characteristics:
further, when controlling the opening of one PFC among the PFC channels in the closed state according to the first opening duration and the closing duration, the controller is specifically configured to: judging whether the closing time is the same or not; when the closing time length is judged to be the same, controlling one PFC channel in the PFC channels in the closing state to be opened according to the first opening time length; and when the closing time periods are judged to be different, controlling the PFC channel corresponding to the longest closing time period to be opened.
Further, when determining whether the closing time period is the same, the controller is specifically configured to: when the difference value between the closing time durations corresponding to the PFC channels in the closing state does not exceed a first preset difference value, judging that the closing time durations are the same; and when the difference value between the closing time durations corresponding to the PFC channels in the closing state exceeds the first preset difference value, judging that the closing time durations are different.
Further, when controlling the opening of one PFC channel in the PFC channels in the closed state according to the first opening duration, the controller is specifically configured to: judging whether the first opening time is the same or not; when the first opening time is judged to be the same, any one of the PFC channels in the closed state is controlled to be opened; and when the first opening time periods are judged to be different, controlling the PFC channel corresponding to the shortest first opening time period to be opened.
Further, when determining whether the first opening duration is the same, the controller is specifically configured to: when the difference value between the first opening time periods corresponding to the different PFC channels in the closed state does not exceed a second preset difference value, judging that the first opening time periods are the same; and when the difference value between the first opening time periods corresponding to the different PFC channels in the closed state exceeds the second preset difference value, judging that the first opening time periods 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 specifically configured to: and controlling the PFC channel corresponding to the longest second opening duration to be closed.
Further, when the PFC channel corresponding to the longest closing duration, or the PFC channel corresponding to the shortest first opening duration, or the PFC channel corresponding to the longest second opening duration is not unique, the controller is specifically configured to: selecting any one of the PFC channels corresponding to the longest closing duration as the PFC channel corresponding to the longest closing duration; or selecting any one of the PFC channels corresponding to the shortest first opening duration as the PFC channel corresponding to the shortest first opening duration; or selecting any one of the PFC channels corresponding to the longest second opening duration as the PFC channel corresponding to the longest second opening duration.
Further, when judging whether the condition of opening or closing the PFC tunnel is satisfied according to the operation parameter, the controller is specifically configured to: when the operation parameter is larger than a preset value, judging that the condition for starting the PFC channel is met; and when the operation parameter is not greater than the preset value, judging that the condition of closing the PFC channel is met.
Further, the operating parameters include at least one of input power, output power, and 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 condition of starting or closing the PFC channel is met is judged according to the operation parameters; when judging that the condition for opening the PFC channels is met, acquiring a first opening duration corresponding to the last opening operation of all the PFC channels in a closed state and a closing duration corresponding to the last closing time of the PFC channels, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening duration and the closing duration; when judging that the condition of closing the PFC channels is met, obtaining a second opening duration corresponding to the 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 duration, so that the temperature rise of electronic components in the PFC channels can be reduced, the use frequency of the components is balanced, and the service life of the electronic components is prolonged.
The present invention also provides a control method of an air conditioner for the air conditioner according to any of the embodiments, wherein the method comprises the following steps: when the air conditioner is started to operate, acquiring the operating parameters of the power supply of the air conditioner in real time; judging whether the condition of opening or closing the PFC channel is met or not according to the operation parameters; when judging that the condition for opening the PFC channels is met, acquiring a first opening duration corresponding to the last opening operation of all the PFC channels in a closed state and a closing duration corresponding to the last closing operation of the PFC channels, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening duration and the closing duration; when judging that the condition for closing the PFC channels is met, acquiring a second opening duration corresponding to all the PFC channels in the opening state when the PFC channels are opened and operated this time, and controlling one PFC channel in the opening state to be closed according to the second opening duration.
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 condition of opening or closing the PFC channel is met is judged according to the operation parameters; when judging that the condition for opening the PFC channels is met, acquiring a first opening duration corresponding to the last opening operation of all the PFC channels in a closed state and a closing duration corresponding to the last closing time of the PFC channels, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening duration and the closing duration; when judging that the condition of closing the PFC channels is met, obtaining a second opening duration corresponding to the 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 duration, so that the temperature rise of electronic components in the PFC channels can be reduced, the use frequency of the components is balanced, and 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 foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic view of a structure of an air conditioner according to an embodiment of the present invention;
Fig. 2 is a schematic diagram of a three-channel PFC circuit topology according to one embodiment of the present invention;
Fig. 3 is a flowchart for controlling the opening of one of PFC channels in a closed state according to a first opening period and a closing period according to an embodiment of the present invention;
FIG. 4 is a flowchart for determining whether the closing time period is the same according to one embodiment of the present invention;
fig. 5 is a flowchart for controlling the opening of one of PFC channels in an off state according to a first opening period according to an embodiment of the present invention;
FIG. 6 is a flowchart for determining whether a first opening duration is the same according to one embodiment of the present invention;
Fig. 7 is a flowchart for judging whether a condition for opening or closing a PFC tunnel 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 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 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 the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify 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.
The terms "first," "second," and the like, 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
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.
The air conditioner of the present invention performs a refrigerating 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 a 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 may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner may adjust the temperature of the indoor space throughout the cycle.
An outdoor unit of an air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, an indoor unit of the air conditioner includes an indoor heat exchanger, and an electronic expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater of a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler of a cooling mode.
An air conditioner and a control method thereof according to an embodiment of the present invention are described below with reference to fig. 1 to 8.
Fig. 1 is a schematic view of a structure of an air conditioner according to an embodiment of the present invention. As shown in fig. 1, an air conditioner includes: the device comprises a shell 10, a refrigerant circulation loop 20, a multi-channel PFC circuit 30 and a controller 40. Wherein, the refrigerant circulation loop 20 makes the refrigerant carry out refrigeration circulation in a loop composed of a compressor, a condenser, an electronic expansion valve and an evaporator, one of the condenser and the evaporator is an outdoor heat exchanger, and the other 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 parallel PFC channels and is used for correcting the waveform of the input current 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 to operate, acquiring the operation parameters of the power supply of the air conditioner in real time, and judging whether the conditions for starting or closing the PFC channel are met according to the operation parameters; when judging that the condition for opening the PFC channels is met, acquiring a first opening duration corresponding to the last opening operation of all the PFC channels in a closed state and a closing duration corresponding to the last closing time of the PFC channels, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening duration and the closing duration; when judging that the condition for closing the PFC channels is met, acquiring a second opening duration corresponding to the 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 duration.
Specifically, the air conditioner, especially the variable frequency air conditioner, has a wide working range, and after the air conditioner is started, the quantity of the PFC channels which are started is required to be adjusted in real time according to the operation parameters of the power supply of the air conditioner, so that the opening of unnecessary 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 closing time length corresponding to the last closing time, the larger the temperature reduction of electronic components, particularly power components, in the PFC channel is, and the service life of the electronic components is related to the first opening time length when the PFC channel is opened and operated last time, so when judging that the condition of opening the PFC channel is met, one PFC channel in the closed state can be controlled to be opened according to the first opening time length corresponding to the PFC channel in the closed state when all the PFC channels are opened and operated last time and the closing time length corresponding to the PFC channel in the closed state when the PFC channel is closed last time. Similarly, when judging that the condition of closing the PFC channels is met, 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 invention controls one PFC channel in the opened PFC channels to be closed according to the second opening time corresponding to the current opening operation of all the PFC channels in the opened PFC channels. Therefore, on the basis of not changing the staggered PFC topological structure, when the PFC channels are required to be opened or closed, one PFC channel in the PFC channels in the closed state is controlled to be opened by distributing the running time of each PFC channel, or one PFC channel in the PFC channels in the opened state is controlled to be closed, 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 a specific embodiment, a three-channel PFC circuit is taken as an example to describe the opening or closing of the PFC channel according to the present invention. As shown in fig. 2, the three-channel PFC circuit 30 includes three parallel PFC channels, where a first channel includes a first inductor L1, a first transistor IGBT1, a first diode D1, and a first resistor R1, a second channel includes a second inductor L2, a second transistor IGBT2, a second diode D2, and a second resistor R2, and a 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 on and off of the channels through a transistor connected to the controller 40.
In one embodiment of the present invention, as shown in fig. 3, when one of the PFC channels in the closed state is controlled to be opened according to the first opening period and the closing period, the controller 40 is specifically configured to: judging whether the closing time is the same; when judging that the closing time length is the same, controlling one PFC channel in the PFC channels in the closing state to be opened according to the first opening time length; and when judging that the closing time periods are different, controlling the PFC channel corresponding to the longest closing time period to be opened.
Specifically, when the PFC channel is controlled to be opened, the longer the PFC channel in the closed state is from the closing time corresponding to the last closing time of the channel, the smaller the temperature rise of the PFC channel is considered, at the moment, the PFC channel corresponding to the longest closing time is controlled to be opened, so that the temperature rise of electronic components can be effectively reduced, and the service life of the electronic components is prolonged; when the closing time is the same, one PFC channel in the PFC channels in the closing state is controlled to be opened according to the first opening time, namely the corresponding opening time when the PFC channels are opened and operated last time, so that the working time of electronic components in each PFC channel can be balanced, and the working life of the electronic components is prolonged.
In a specific embodiment, after the air conditioner is started and operated, if the condition of opening the PFC channels is met, one PFC channel is opened, at this time, one PFC channel with the longest closing duration is preferentially opened, which is the stopped working time in all PFC channels in the closed state, and if the closing durations of all PFC channels are the same, one PFC channel is controlled to be opened according to the last operation time of all PFC channels in the closed state. After one PFC channel is started, if the power or the current of the air conditioner continuously rises, and when 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, the PFC channel which is in the closed state and has the longest closing time is preferentially started, and if the closing time of the remaining PFC channels in the closed state is the same, one PFC channel is controlled to be started according to the last running time of the remaining PFC channels in the closed state. And so on, when the condition of opening the third PFC pass is satisfied, the method of opening the third PFC pass is the same as the method of opening the first PFC pass, and details are not repeated here.
In one embodiment of the present invention, as shown in fig. 4, in determining whether the closing time period is the same, the controller 40 is specifically configured to: when the difference value between the closing time durations corresponding to the different PFC channels in the closing state does not exceed a first preset difference value, judging that the closing time durations are the same; when the difference value between the closing time durations corresponding to the different PFC channels in the closing state exceeds a first preset difference value, judging that the closing time durations are different.
Specifically, in order to further improve the service life of electronic components and balance the working time of the electronic components in each PFC channel, when judging whether the closing time is the same, the embodiment of the invention sets a first preset difference value, for example, 10min, and judges whether the closing time is the same by comparing the difference value between the closing time corresponding to different PFC channels in the closing state with the first preset difference value. It can be understood that the first preset difference value can be determined according to experiments to ensure that each PFC channel has a relatively long service life, which is not described herein.
In a specific embodiment, the difference between the closing time length of the first PFC channel and the closing time length of the second PFC channel is, for example, 5min, and then the difference between the closing time length of the first PFC channel and the closing time length of the second PFC channel is smaller than a first preset difference, so that the closing time length of the first PFC channel and the closing time length of the second PFC channel are the same, and the probability that the closing time lengths of all the PFC channels in the closed state are the same is increased, so that when the closing time lengths of all the PFC channels in the closed state are the same, the opening of one of the PFC channels in the closed state is controlled according to the first opening time length.
In one embodiment of the present invention, as shown in fig. 5, when one of the PFC channels in the closed state is controlled to be opened according to the first opening period, the controller 40 is specifically configured to: judging whether the first opening time is the same or not; when the first opening time is judged to be the same, any one PFC channel in the PFC channels in the closed state is controlled to be opened; and when the first opening time periods are judged to be different, the PFC channel corresponding to the shortest first opening time period is controlled to be opened.
Specifically, when the first opening time is the same, the working time of all the PFC channels in the closed state is the same, and any one PFC channel in the closed state is controlled to be opened; when the first opening time is different, the PFC channels corresponding to the shortest first opening time are controlled to be opened, so that the working time of the PFC channels can be prolonged, the working time of each PFC channel is balanced, and the working life of electronic components is prolonged. In a specific embodiment, when the first opening time is the same, one of the PFC channels in the closed state may be randomly selected to be opened by a random number.
In one embodiment of the present invention, as shown in fig. 6, when determining whether the first on-time period is the same, the controller 40 is specifically configured to: when the difference value between the first opening time periods corresponding to the different PFC channels in the closed state does not exceed the second preset difference value, judging that the first opening time periods are the same; when the difference value between the first opening time periods corresponding to the different PFC channels in the closed state exceeds a second preset difference value, judging that the first opening time periods 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, when the embodiment of the present invention determines whether the first opening time periods are the same, a second preset difference value, for example, 5min is set, and whether the first opening time periods are the same is determined by comparing the difference value between the first opening time periods corresponding to the last opening operation of all the PFC channels in the closed state with the second preset difference value. It can be understood that the second preset difference value can be determined according to experiments, so as to ensure that each PFC channel has a relatively long service life, which is not described herein.
In a specific embodiment, the difference between the first opening duration of the first PFC channel and the first opening duration of the second PFC channel is, for example, 3min, and then the difference between the first opening duration of the first PFC channel and the first opening duration of the second PFC channel is smaller than the second preset difference, so that the first opening duration of the first PFC channel and the first opening duration of the second PFC channel are the same, so as to increase the probability that the first opening durations of all PFC channels in the closed state are the same, and thus, when the first opening durations of all PFC channels in the closed state are the same, any one PFC channel in the closed state is controlled to be opened.
In one embodiment of the present invention, when one of the PFC channels in the on state is controlled to be closed according to the second on period, the controller 40 is specifically configured to: and controlling the PFC channel corresponding to the longest second opening duration to be closed.
Specifically, when the PFC channels are controlled to be closed, the longer the second opening time periods corresponding to all the PFC channels in the opening state are, the longer the working time is considered, and at the moment, the PFC channels corresponding to the longest second opening time periods are controlled to be closed, so that the temperature rise of electronic components in the PFC channels can be effectively reduced, and the working life of the electronic components is prolonged.
In a specific embodiment, after the air conditioner is started and operated, if the condition of closing the PFC channels is satisfied, one PFC channel is closed, and at this time, the PFC channel with the longest operation time is closed. After closing one PFC channel, if the power or current of the air conditioner is continuously reduced 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 open state is closed, and if the running time of the remaining PFC channels in the open state is the same, any one of the remaining PFC channels in the open state is controlled to be closed. And so on, when the condition of closing the third PFC pass is satisfied, the method of closing the third PFC pass is the same as the method of closing the first PFC pass, and details are not repeated here.
In one embodiment of the present invention, when the PFC channel corresponding to the longest off period, or the PFC channel corresponding to the shortest first on period, or the PFC channel corresponding to the longest second on period is not unique, the controller 40 is specifically configured to: selecting any one PFC channel corresponding to the longest closing duration as the PFC channel corresponding to the longest closing duration; or selecting any PFC channel in the PFC channels corresponding to the shortest first opening duration as the PFC channel corresponding to the shortest first opening duration; or selecting any one of the PFC channels corresponding to the longest second opening duration as the PFC channel corresponding to the longest second opening duration.
Specifically, when the PFC channels corresponding to the longest closing duration are not the same, the temperature rise of the PFC channels corresponding to the longest closing duration is considered to be the same, and when the PFC channels corresponding to the shortest first opening duration or the PFC channels corresponding to the longest second opening duration are not the same, the PFC channels corresponding to the shortest first opening duration or the PFC channels corresponding to the longest second opening duration are considered to be the same, and the PFC channels can be selected correspondingly. At this time, any one PFC channel in the PFC channels corresponding to the longest closing duration is selected as the PFC channel corresponding to the longest closing duration; or selecting any PFC channel in the PFC channels corresponding to the shortest first opening duration as the PFC channel corresponding to the shortest first opening duration; or selecting any one of the PFC channels corresponding to the longest second opening duration as the PFC channel corresponding to the longest second opening duration.
In one embodiment of the present invention, as shown in fig. 7, when determining whether the condition for opening or closing the PFC tunnel 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 starting the PFC channel is met; and when the operation parameter is not greater than the preset value, judging that the condition of closing the PFC channel is met.
Specifically, the operation parameters of the air conditioner include at least one of input power, output power and input current, and the larger the operation parameters of the air conditioner are, the larger the number of PFC channels to be opened is. 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 PFC channels to be opened 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 channels can be sampled through the resistors in the channels, and the input current of the air conditioner can be calculated through the current of each channel or can be estimated through the current of the direct current bus. It should be noted that, calculating the input current of the air conditioner by the current of each channel or estimating the input current of the air conditioner by the current of the dc bus, and correspondingly calculating the input power and the output power according to the input current or the output current are all in the prior art, which is not 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 and 2000W, if the input power is greater than 500W, it is determined that the condition of opening the PFC channel is met, one PFC channel is opened, and if the input power of the air conditioner continues to rise and reaches 1000W, it is determined that the condition of opening the PFC channel is met, a second PFC channel is opened; or when the input power of the air conditioner is reduced, if the condition of closing the PFC channels is judged to be met, closing one PFC channel.
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 condition of starting or closing the PFC channel is met is judged according to the operation parameters; when judging that the condition for opening the PFC channels is met, acquiring a first opening duration corresponding to the last opening operation of all the PFC channels in a closed state and a closing duration corresponding to the last closing time of the PFC channels, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening duration and the closing duration; when judging that the condition of closing the PFC channels is met, obtaining a second opening duration corresponding to the 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 duration, so that the temperature rise of electronic components in the PFC channels can be reduced, the use frequency of the components is balanced, and the service life of the electronic components is prolonged.
Further embodiments of the present invention also disclose a control method of an air conditioner, for an air conditioner according to any of the above embodiments, as shown in fig. 8, the method includes the following steps:
step S1, when the air conditioner is started to operate, acquiring the operation parameters of the power supply of the air conditioner in real time;
Step S2, judging whether the condition of opening or closing the PFC channel is met or not according to the operation parameters;
Step S3, when judging that the condition for opening the PFC channels is met, acquiring a first opening duration corresponding to the last opening operation of all the PFC channels in a closed state and a closing duration corresponding to the last closing time of the PFC channels, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening duration and the closing duration;
And S4, when judging that the condition of closing the PFC channels is met, acquiring a second opening time length corresponding to the opening operation of all the PFC channels in the opening state, and controlling one PFC channel in the opening state to be closed according to the second opening time length.
In one embodiment of the present invention, controlling the opening of one PFC among PFC channels in a closed state according to a first opening period and a closing period includes: judging whether the closing time is the same; when judging that the closing time length is the same, controlling one PFC channel in the PFC channels in the closing state to be opened according to the first opening time length; and when judging that the closing time periods are different, controlling the PFC channel corresponding to the longest closing time period to be opened.
In one embodiment of the present invention, determining whether the closing time periods are the same includes: when the difference value between the closing time durations corresponding to the different PFC channels in the closing state does not exceed a first preset difference value, judging that the closing time durations are the same; when the difference value between the closing time durations corresponding to the different PFC channels in the closing state exceeds a first preset difference value, judging that the closing time durations are different.
In one embodiment of the present invention, controlling the opening of one PFC among PFC channels in an off state according to a first opening period includes: judging whether the first opening time is the same or not; when the first opening time is judged to be the same, any one PFC channel in the PFC channels in the closed state is controlled to be opened; and when the first opening time periods are judged to be different, the PFC channel corresponding to the shortest first opening time period is controlled to be opened.
In one embodiment of the present invention, determining whether the first opening duration is the same includes: when the difference value between the first opening time periods corresponding to the different PFC channels in the closed state does not exceed the second preset difference value, judging that the first opening time periods are the same; when the difference value between the first opening time periods corresponding to the different PFC channels in the closed state exceeds a second preset difference value, judging that the first opening time periods are different.
In one embodiment of the present invention, controlling closing of one PFC among PFC channels in an on state according to a second on period includes: and controlling the PFC channel corresponding to the longest second opening duration to be closed.
In one embodiment of the invention, when the PFC channel corresponding to the longest closing time length, or the PFC channel corresponding to the shortest first opening time length, or the PFC channel corresponding to the longest second opening time length is not unique, any one PFC channel in 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 PFC channel in the PFC channels corresponding to the shortest first opening duration as the PFC channel corresponding to the shortest first opening duration; or selecting any one of the PFC channels corresponding to the longest second opening duration as the PFC channel corresponding to the longest second opening duration.
In one embodiment of the present invention, controlling closing of one PFC among PFC channels in an on state according to a second on period includes: when the operation parameter is larger than a preset value, judging that the condition for starting the PFC channel is met; and when the operation parameter is not greater than the preset value, judging that the condition of closing the PFC channel is met.
In one embodiment of the invention, the operating parameters include 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, the specific implementation manner of the air conditioner is similar to the specific implementation manner of the control method of the controller of the air conditioner according to the embodiment of the present invention, and specific please refer to the description of the method section, so that redundancy is reduced, and no further description is provided herein.
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 condition of opening or closing the PFC channel is met is judged according to the operation parameters; when judging that the condition for opening the PFC channels is met, acquiring a first opening duration corresponding to the last opening operation of all the PFC channels in a closed state and a closing duration corresponding to the last closing time of the PFC channels, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening duration and the closing duration; when judging that the condition of closing the PFC channels is met, obtaining a second opening duration corresponding to the 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 duration, so that the temperature rise of electronic components in the PFC channels can be reduced, the use frequency of the components is balanced, and the service life of the electronic components is prolonged.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., 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 invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. An air conditioner, comprising:
A housing;
A refrigerant circulation loop, wherein the refrigerant is subjected to refrigeration circulation in a loop formed by a compressor, a condenser, an electronic expansion valve and an evaporator, one of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger;
The multi-channel PFC circuit is connected in parallel between a power input end and a power output end of the air conditioner and 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 to operate, acquiring the operation parameters of the power supply of the air conditioner in real time, and judging whether the conditions for starting or closing the PFC channel are met according to the operation parameters;
when judging that the condition for opening the PFC channels is met, acquiring a first opening duration corresponding to the last opening operation of all the PFC channels in a closed state and a closing duration corresponding to the last closing operation of the PFC channels, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening duration and the closing duration;
when judging that the condition for closing the PFC channels is met, acquiring a second opening duration corresponding to all the PFC channels in the opening state when the PFC channels are opened and operated this time, and controlling one PFC channel in the opening state to be closed according to the second opening duration.
2. The air conditioner according to claim 1, wherein when one of the PFC channels in the closed state is controlled to be opened according to the first opening period and the closing period, the controller is specifically configured to:
judging whether the closing time is the same or not;
when the closing time length is judged to be the same, controlling one PFC channel in the PFC channels in the closing state to be opened according to the first opening time length;
And when the closing time periods are judged to be different, controlling the PFC channel corresponding to the longest closing time period to be opened.
3. The air conditioner according to claim 2, wherein in determining whether the closing time period is the same, the controller is specifically configured to:
When the difference value between the closing time durations corresponding to the PFC channels in the closing state does not exceed a first preset difference value, judging that the closing time durations are the same;
And when the difference value between the closing time durations corresponding to the PFC channels in the closing state exceeds the first preset difference value, judging that the closing time durations are different.
4. The air conditioner according to claim 2, wherein when one of the PFC channels in the closed state is controlled to be opened according to the first opening period, the controller is specifically configured to:
Judging whether the first opening time is the same or not;
when the first opening time is judged to be the same, any one of the PFC channels in the closed state is controlled to be opened;
and when the first opening time periods are judged to be different, controlling the PFC channel corresponding to the shortest first opening time period to be opened.
5. The air conditioner of claim 4, wherein in determining whether the first on-time is the same, the controller is specifically configured to:
When the difference value between the first opening time periods corresponding to the different PFC channels in the closed state does not exceed a second preset difference value, judging that the first opening time periods are the same;
and when the difference value between the first opening time periods corresponding to the different PFC channels in the closed state exceeds the second preset difference value, judging that the first opening time periods are different.
6. The air conditioner of claim 4, wherein when one of the PFC channels in the on state is controlled to be closed according to the second on period, the controller is specifically configured to:
and controlling the PFC channel corresponding to the longest second opening duration to be closed.
7. The air conditioner of claim 6, wherein when the PFC channel corresponding to the longest off period, or the PFC channel corresponding to the shortest first on period, or the PFC channel corresponding to the longest second on period is not unique, the controller is specifically configured to:
selecting any one of the PFC channels corresponding to the longest closing duration as the PFC channel corresponding to the longest closing duration; or alternatively
Selecting any one of the PFC channels corresponding to the shortest first opening duration as the PFC channel corresponding to the shortest first opening duration; or alternatively
And selecting any one of the PFC channels corresponding to the longest second opening duration as the PFC channel corresponding to the longest second opening duration.
8. The air conditioner according to claim 1, wherein when judging whether a condition for opening or closing the PFC tunnel is satisfied according to the operation parameter, the controller is specifically configured to:
when the operation parameter is larger than a preset value, judging that the condition for starting the PFC channel is met;
And when the operation parameter is not greater than the preset value, judging that the condition of closing the PFC channel is met.
9. The air conditioner of claim 8, wherein the operating parameters include at least one of an input power, an output power, and an input current.
10. A control method of an air conditioner, characterized in that it is used for an air conditioner according to any one of claims 1 to 9, comprising the steps of:
When the air conditioner is started to operate, acquiring the operating parameters of the power supply of the air conditioner in real time;
judging whether the condition of opening or closing the PFC channel is met or not according to the operation parameters;
when judging that the condition for opening the PFC channels is met, acquiring a first opening duration corresponding to the last opening operation of all the PFC channels in a closed state and a closing duration corresponding to the last closing operation of the PFC channels, and controlling one PFC channel in the PFC channels in the closed state to be opened according to the first opening duration and the closing duration;
when judging that the condition for closing the PFC channels is met, acquiring a second opening duration corresponding to all the PFC channels in the opening state when the PFC channels are opened and operated this time, and controlling one PFC channel in the opening state to be closed according to the second opening duration.
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| EP2100362A4 (en) * | 2007-01-08 | 2014-09-24 | Dipolar Ab | Interleaved power factor corrector boost converter |
| EP2871758A1 (en) * | 2013-11-08 | 2015-05-13 | Nxp B.V. | A circuit for a PFC circuit |
| JP6538418B2 (en) * | 2015-05-11 | 2019-07-03 | シャープ株式会社 | POWER SUPPLY CIRCUIT AND AIR CONDITIONER COMPRISING THE SAME |
| DE102015217629A1 (en) * | 2015-09-15 | 2017-03-16 | Tridonic Gmbh & Co Kg | PFC module for intermittent operation |
| US10770966B2 (en) * | 2016-04-15 | 2020-09-08 | Emerson Climate Technologies, Inc. | Power factor correction circuit and method including dual bridge rectifiers |
| CN107276385B (en) * | 2017-06-21 | 2020-01-14 | 广东美的制冷设备有限公司 | Method and device for acquiring effective value of alternating voltage of PFC (power factor correction) power supply |
| CN107276386B (en) * | 2017-06-21 | 2020-03-06 | 广东美的制冷设备有限公司 | Method and device for acquiring effective value of alternating voltage of PFC (power factor correction) power supply |
| CN107919795B (en) * | 2017-12-14 | 2019-08-30 | 广东美的制冷设备有限公司 | Transducer air conditioning and its control method, device |
| US11362582B2 (en) * | 2019-07-26 | 2022-06-14 | Emerson Climate Technologies, Inc. | Multi-phase converter control system and method for interleaving multi-phase converters |
| CN111371307B (en) * | 2020-03-18 | 2021-09-21 | 青岛海尔空调器有限总公司 | Control method of PFC circuit in variable frequency air conditioner and variable frequency air conditioner |
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| CN111865066A (en) * | 2020-07-16 | 2020-10-30 | 珠海格力电器股份有限公司 | Control method and controller of air conditioner power factor corrector and power factor corrector |
| CN112648693B (en) * | 2020-12-18 | 2023-08-04 | 青岛海信日立空调系统有限公司 | Air conditioner and multi-channel PFC circuit control method |
| CN115250057A (en) * | 2021-04-26 | 2022-10-28 | 佛山市顺德区美的电子科技有限公司 | Control method and device for electronic equipment, electronic equipment and computer storage medium |
| CN215990563U (en) * | 2021-09-28 | 2022-03-08 | 海信（广东）空调有限公司 | Circuit for preventing false detection of zero-crossing signal, PFC circuit and air conditioner |
| CN114322228B (en) * | 2022-01-05 | 2023-02-10 | 青岛海信日立空调系统有限公司 | Air conditioner |
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