CN115711475A - Air conditioner and control method thereof - Google Patents
Air conditioner and control method thereof Download PDFInfo
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- CN115711475A CN115711475A CN202211498814.3A CN202211498814A CN115711475A CN 115711475 A CN115711475 A CN 115711475A CN 202211498814 A CN202211498814 A CN 202211498814A CN 115711475 A CN115711475 A CN 115711475A
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses an air conditioner and a control method thereof, wherein the air conditioner comprises: casing, refrigerant circulation return circuit, refrigerating system, multichannel PFC circuit, outdoor ambient temperature sensor and controller, the controller is configured as: when the air conditioner is started, the input current of the air conditioner detected by the multi-channel PFC circuit and the outdoor environment temperature collected by the outdoor environment temperature sensor are obtained, the number of the PFC channels needing to be started at present is determined according to the input current and the outdoor environment temperature, and the starting operation of the PFC channels in corresponding number is controlled, so that the reliable operation of power devices such as triodes is ensured, the utilization rate of each channel is improved, the opening of unnecessary channels is reduced, the switching loss of the power devices is reduced, and the efficiency and the whole machine energy efficiency of the air conditioner are improved.
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
Currently, most inverter air conditioners include a PFC (Power Factor Correction) circuit to improve the Power Factor of a Power supply and reduce the harmonic voltage of a Power supply rectification circuit. The common PFC circuit includes a single PFC and a multi-path interleaved PFC, and the multi-path interleaved PFC circuit generally adopts a method of fixedly opening all channels, but when the load power changes, the power factor and the system efficiency also change, sometimes the system efficiency is lower, and the loss of the power device is increased. Therefore, how to perform reasonable channel management on the multi-channel PFC circuit, improve system efficiency, reduce device loss, and ensure the reliability of PFC operation is a problem that needs to be solved urgently.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention aims to provide an air conditioner and a control method thereof.
The invention provides an air conditioner, comprising: a housing; the refrigerant circulating loop is arranged in the shell and used for enabling the refrigerant to circulate in a loop formed by the compressor, the condenser, the electronic expansion valve, the evaporator, the four-way valve and the pressure reducer; a refrigeration system that performs heat exchange between a refrigerant and indoor air in a compression refrigeration cycle of the refrigerant circulation circuit, the refrigeration system including a compressor that performs work of compressing a low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas and discharging the refrigerant gas to the condenser; 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; an outdoor environment temperature sensor for acquiring outdoor environment temperature; the controller is configured to: when the air conditioner is started, the input current of the air conditioner detected by the multi-channel PFC circuit and the outdoor environment temperature collected by the outdoor environment temperature sensor are obtained, the number of the PFC channels needing to be started at present is determined according to the input current and the outdoor environment temperature, and the corresponding number of the PFC channels are controlled to be started.
In addition, the air conditioner according to the embodiment of the invention may further have the following additional technical features:
further, when determining the number of the PFC channels that currently need to be turned on according to the input current and the outdoor ambient temperature, the controller is configured to: determining a temperature interval in which the outdoor environment temperature is located; determining a current-PFC channel opening number mapping relation table corresponding to the temperature interval, wherein different current-PFC channel opening number mapping relation tables are calibrated in advance in different temperature intervals; and according to the input current, obtaining the number of the PFC channels needing to be opened at present by inquiring a current-PFC channel opening number mapping relation table corresponding to the temperature interval.
Further, according to the input current, by querying a current-PFC channel turn-on number mapping table corresponding to the temperature interval, the controller is configured to: determining a current interval in which the input current is positioned; and determining the number of the PFC channels needing to be started currently according to the current intervals, wherein different current intervals correspond to different numbers of the PFC channels needing to be started.
Further, after controlling the respective number of PFC channels to start operating, the controller is further configured to: when the input current and/or the outdoor environment temperature change, the number of the PFC channels which are operated currently is adjusted according to the new input current and/or the new outdoor environment temperature.
Further, when adjusting the number of PFC channels currently in operation according to a new input current and/or a new outdoor ambient temperature, the controller is configured to: when the temperature interval where the new outdoor environment temperature is located does not change, inquiring a current-PFC channel opening number mapping relation table corresponding to the temperature interval according to the new input current to obtain the new number of the PFC channels needing to be opened, and adjusting the number of the PFC channels which are currently operated according to the new number of the PFC channels needing to be opened.
Further, when adjusting the number of PFC channels currently in operation according to a new input current and/or a new outdoor ambient temperature, the controller is configured to: when the temperature interval where the new outdoor environment temperature is located changes, determining a new temperature interval, determining a new current-PFC channel opening number mapping relation table according to the new temperature interval, inquiring the new current-PFC channel opening number mapping relation table according to the input current or the new input current to obtain the new number of the PFC channels needing to be opened, and adjusting the number of the PFC channels which currently run according to the new number of the PFC channels needing to be opened.
Further, when the number of the currently-operating PFC channels is adjusted according to the new number of the PFC channels that need to be turned on, the controller is configured to: comparing the number of the new PFC channels needing to be started with the number of the current operation PFC channels; if the number of the new PFC channels needing to be started is larger than the number of the current operation PFC channels, starting the new PFC channels to increase the number of the current operation PFC channels, wherein the number of the new PFC channels needing to be started is the difference value between the number of the new PFC channels needing to be started and the number of the current operation PFC channels; if the number of the new PFC channels needing to be started is smaller than the number of the PFC channels running at present, closing part of the started PFC channels to reduce the number of the PFC channels running at present, wherein the number of the closed PFC channels is the difference value between the number of the PFC channels running at present and the new number of the PFC channels needing to be started.
Further, the controller is configured to: when a new PFC channel is started to increase the number of the current operation PFC channels, directly controlling the starting of the PFC channels with the new number of the PFC channels; and when the partially opened PFC channels are closed to reduce the number of the currently operated PFC channels, the partially opened PFC channels are closed after delaying for a first preset time or according to a preset return difference value.
Further, before obtaining the input current of the air conditioner detected by the multi-channel PFC circuit and the outdoor ambient temperature collected by the outdoor ambient temperature sensor, the controller is further configured to: and controlling all PFC channels to be started for a second preset time.
According to the air conditioner disclosed by the embodiment of the invention, the input current of the air conditioner detected by the multi-channel PFC circuit and the outdoor environment temperature acquired by the outdoor environment temperature sensor are acquired, the number of the PFC channels needing to be started at present is determined according to the input current and the outdoor environment temperature, and meanwhile, the influence of the load current change and the outdoor environment temperature change of the air conditioner on the operation reliability of a power device is considered, so that the reliable operation of the power device such as a triode and the like can be ensured, the utilization rate of each channel can be improved, the opening of unnecessary channels is reduced, the switching loss of the power device is reduced, and the efficiency of the air conditioner and the energy efficiency of the whole machine are improved.
In view of the above problems, the present invention further provides a method for controlling an air conditioner, including: when the air conditioner is started, acquiring input current of the air conditioner detected by a multi-channel PFC circuit and outdoor environment temperature acquired by an outdoor environment temperature sensor; determining the number of PFC channels needing to be opened currently according to the input current and the outdoor environment temperature; and controlling the PFC channels of corresponding quantity to start and operate.
According to the control method of the air conditioner, the input current of the air conditioner detected by the multi-channel PFC circuit and the outdoor environment temperature acquired by the outdoor environment temperature sensor are obtained, the number of the PFC channels needing to be started at present is determined according to the input current and the outdoor environment temperature, and meanwhile, the influence of the load current change and the outdoor environment temperature change of the air conditioner on the operation reliability of the power device is considered, so that the reliable operation of the power devices such as a triode and the like can be ensured, the utilization rate of each channel can be improved, the opening of unnecessary channels is reduced, the switching loss of the power device is reduced, and the efficiency and the overall energy efficiency of the air conditioner are improved.
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 diagram of a three channel PFC circuit according to one embodiment of the present invention;
fig. 3 is a flow chart for determining the number of PFC channels currently required to be turned on according to the input current and the outdoor ambient temperature, according to an embodiment of the present invention;
fig. 4 is a flowchart of querying a current-PFC channel turn-on number mapping table corresponding to a temperature interval according to an input current according to an embodiment of the present invention;
fig. 5 is a flow chart for adjusting the number of PFC channels currently in operation according to a new input current and/or a new outdoor ambient temperature, according to one embodiment of the present invention;
fig. 6 is a flow chart for adjusting the number of currently operating PFC channels according to a new input current and/or a new outdoor ambient temperature, according to another embodiment of the present invention;
fig. 7 is a flowchart for adjusting the number of PFC channels currently operating according to the new number of PFC channels to be turned on 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 to implicitly indicate 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 and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 in the present invention performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an 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 expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. 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 expansion valve may be provided in either 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 air conditioner comprises a shell 10, a refrigerant circulation loop 20, a refrigerating system 30, a multi-channel PFC circuit 40, an outdoor environment temperature sensor 50 and a controller 60. The refrigerant circulation loop 20 is arranged in the shell 10 and used for circulating a refrigerant in a loop formed by a compressor, a condenser, an electronic expansion valve, an evaporator, a four-way valve and a pressure reducer; the refrigeration system 30 performs heat exchange between a refrigerant and indoor air in a compression refrigeration cycle of the refrigerant circulation circuit 20, and the refrigeration system 30 includes a compressor for compressing a low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas and discharging the refrigerant gas to a condenser; the multi-channel PFC circuit 40 is connected in parallel between a power supply input end and a power supply output end of the air conditioner, and the multi-channel PFC circuit 40 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 outdoor environment temperature sensor 50 is used for acquiring outdoor environment temperature; the controller 60 is configured to: when the air conditioner is started, the input current of the air conditioner detected by the multi-channel PFC circuit 40 and the outdoor environment temperature collected by the outdoor environment temperature sensor 50 are obtained, the number of PFC channels needing to be started at present is determined according to the input current and the outdoor environment temperature, and the corresponding number of PFC channels is controlled to be started.
Specifically, the air conditioner, especially the inverter air conditioner, has a wide working range and a wide input voltage working range, and the heat generation of the power device is mainly proportional to the input current and the outdoor environment temperature. When the output power of the air conditioner is constant, and when the input voltage is low or the outdoor environment temperature is high, the input current is much larger than the rated current, so that the influence of the load current change of the air conditioner and the outdoor environment temperature change on the operation reliability of the power device needs to be considered at the same time, the unnecessary opening of a PFC channel is reduced, the switching loss of the power device is reduced, the efficiency of the air conditioner and the energy efficiency of the whole air conditioner are improved, and the energy conservation and emission reduction are realized.
In the specific embodiment, the management of the number of PFC channels implemented by the present invention is described by taking a three-channel PFC circuit as an example. As shown in fig. 2, the three-channel PFC circuit 40 includes three PFC channels connected in parallel, where the first channel includes a first inductor L1, a first triode IGBT1, a first diode D1, and a first resistor R1, the second channel includes a second inductor L2, a second triode IGBT2, a second diode D2, and a second resistor R2, the third channel includes a third inductor L3, a third triode IGBT3, a third diode D3, and a third resistor R3, each PFC channel controls the opening and closing of the channel through a triode connected to the controller 60, and samples a current in the channel through a resistor in the channel, and an input current of the air conditioner may be calculated through a current of each channel or may be estimated through a dc bus current. It should be noted that, it is the prior art to calculate the input current of the air conditioner through the current of each channel or estimate the input current of the air conditioner through the current of the dc bus, and details are not described here. After the input current and the outdoor environment temperature of the air conditioner are obtained, the corresponding number of PFC channels can be controlled to be started and operated according to the preset number of the PFC channels corresponding to the input current and the outdoor environment temperature.
In one embodiment of the present invention, as shown in fig. 3, when determining the number of PFC channels that currently need to be turned on according to the input current and the outdoor ambient temperature, the controller 60 is configured to: determining a temperature interval of the outdoor environment temperature; determining a current-PFC channel opening number mapping relation table corresponding to a temperature interval, wherein different current-PFC channel opening number mapping relation tables are calibrated in advance correspondingly in different temperature intervals; and according to the input current, obtaining the number of the PFC channels needing to be started at present by inquiring a current-PFC channel starting number mapping relation table corresponding to the temperature interval.
Specifically, the multichannel PFC circuit 40 mainly includes a triode, which generates the highest heat and affects the reliability of the air conditioner, and it is necessary to ensure the safe and reliable operation of the triode and other devices, and ensure that the junction temperature is within a safe range, the junction temperature of the triode is determined by the shell temperature, loss, thermal resistance and other factors, and the thermal resistance is fixed. Because the heat dissipation is better when the outdoor environment temperature is lower, the shell temperature is generally lower, the maximum current allowed to be used by each channel can be correspondingly increased, and conversely, when the outdoor environment temperature is higher, namely the shell temperature is higher, the maximum current allowed to be used by each channel can be correspondingly reduced, so that the reliable operation of power devices such as a triode and the like can be ensured, the utilization rate of each channel can be increased, the opening of unnecessary channels can be reduced, and the switching loss of the power devices can be reduced.
Therefore, the outdoor environment temperature can be divided into a plurality of different temperature intervals, each temperature interval comprises the corresponding relation between the input current of the air conditioner and the opening number of the PFC channels, after the outdoor environment temperature is obtained, according to the temperature interval where the outdoor environment temperature is located, a current-PFC channel opening number mapping relation table corresponding to the temperature interval is inquired, the number of the PFC channels corresponding to the input current, namely the number of the PFC channels needing to be opened at present, is obtained, the influence of the load current change of the air conditioner and the outdoor environment temperature change on the operation reliability of the power device is considered at the same time, the opening of unnecessary PFC channels is reduced, the switching loss of the power device is reduced, the efficiency and the whole machine energy efficiency of the air conditioner are improved, and energy conservation and emission reduction are realized.
In one embodiment of the present invention, as shown in fig. 4, when the current-PFC channel opening number mapping table corresponding to the temperature interval is queried according to the input current, the controller 60 is configured to: determining a current interval in which the input current is positioned; and determining the number of PFC channels needing to be started at present according to the current intervals, wherein different current intervals correspond to different numbers of PFC channels needing to be started.
In a specific embodiment, the outdoor environment temperature is divided into three sections, for example, [ T1, T2], [ T2, T3], [ T3, T4], each temperature section includes a mapping relationship between an input current and an opening number of PFC channels, for example, in the temperature section [ T1, T2], an input current section corresponding to a single channel is, for example, [ I1, I2], an input current section corresponding to a double channel is, for example, [ I2, I3], an input current section corresponding to a triple channel is, for example, [ I3, I4], similarly, the temperature section [ T2, T3], or a temperature section [ T3, T4] also includes a corresponding relationship between an opening number of PFC channels and an input current, and after the temperature section corresponding to the outdoor environment and the current section corresponding to the input current are determined, the number of PFC channels that need to be currently opened may be determined, so as to reduce the opening loss of the PFC channels according to the influence of the load current change of the air conditioner and the outdoor environment temperature change on the operational reliability of the power conditioner, so as to reduce the switching loss of the power conditioner, improve the energy efficiency of the air conditioner, and reduce emission.
In one embodiment of the present invention, after controlling the start-up operation of the corresponding number of PFC channels, the controller 60 is further configured to: when the input current and/or the outdoor environment temperature change, the number of the PFC channels which are operated currently is adjusted according to the new input current and/or the new outdoor environment temperature.
Specifically, after the air conditioner is started to operate, the input current changes along with the change of the load power or the outdoor environment temperature, and at the moment, the number of the currently-operating PFC channels needs to be adjusted in time according to the new input current and/or the new outdoor environment temperature so as to adjust the number of the currently-operating PFC channels, so that the working reliability of a PFC circuit is ensured, the system efficiency is improved, and the loss of devices is reduced.
In one embodiment of the present invention, as shown in fig. 5, when the number of currently operating PFC channels is adjusted according to a new input current and/or a new outdoor ambient temperature, the controller 60 is configured to: when the temperature interval where the new outdoor environment temperature is located does not change, inquiring a current-PFC channel opening number mapping relation table corresponding to the temperature interval according to the new input current to obtain the new number of PFC channels needing to be opened, and adjusting the number of the PFC channels which are currently operated according to the new number of the PFC channels needing to be opened.
Specifically, when the temperature range where the outdoor environment temperature is located does not change and the load power increases or decreases, the input current of the air conditioner changes, and at this time, the number of new PFC channels to be turned on needs to be determined according to the new input current, so that when the outdoor environment temperature changes little and the load power changes greatly, the number of currently-operating PFC channels is adjusted according to the new input current, and while the working reliability of the PFC circuit is ensured, the system efficiency is improved, and the device loss is reduced.
In a specific embodiment, a temperature interval where the outdoor environment temperature is located is [ T1, T2], when the input current changes, the current interval where the new input current is located needs to be determined according to the new input current, so as to obtain the number of PFC channels that need to be turned on and correspond to the current interval, that is, the number of PFC channels that need to be turned on and correspond to the new input current, so that when the outdoor environment temperature changes less and the load power changes more greatly, the number of currently-operating PFC channels is adjusted, thereby improving the system efficiency and reducing the device loss while ensuring the working reliability of the PFC circuit.
In one embodiment of the present invention, as shown in fig. 6, when the number of currently operating PFC channels is adjusted according to a new input current and/or a new outdoor ambient temperature, the controller 60 is configured to: when the temperature interval where the new outdoor environment temperature is located changes, determining a new temperature interval, determining a new current-PFC channel opening number mapping relation table according to the new temperature interval, inquiring the new current-PFC channel opening number mapping relation table according to the input current or the new input current to obtain the new number of PFC channels needing to be opened, and adjusting the number of the PFC channels which currently run according to the new number of the PFC channels needing to be opened.
Specifically, when the temperature interval of the outdoor environment temperature changes and the load power changes little, that is, the new current interval does not change, the new outdoor environment temperature interval needs to be determined, and then the number of the new PFC channels to be turned on is determined according to the corresponding relationship between the current interval of the input current and the number of the turned-on PFC channels in the new temperature interval; when the temperature interval of the outdoor environment temperature changes and the load power changes greatly, that is, the new current interval also changes, the new outdoor environment temperature interval needs to be determined, and then the number of the new PFC channels needing to be started is determined according to the corresponding relationship between the current interval of the new input current and the starting number of the PFC channels in the new temperature interval.
In a specific implementation, if the current outdoor environment temperature is in a temperature range of [ T1, T2], and the new outdoor environment temperature is in a temperature range of [ T2, T3], a new current-PFC channel turn-on number mapping table corresponding to [ T2, T3] needs to be determined again, and then the new number of PFC channels needing to be turned on is determined according to the current input current or the new input current. For example, if the current interval in which the new input current is located is also changed, for example, from [ I1, I2] to [ I2, I3], the number of PFC channels corresponding to the temperature interval [ T2, T3] and the current interval [ I2, I3] is used as the new number of PFC channels that need to be turned on, so that when the outdoor environment temperature changes greatly, the number of currently-operating PFC channels is adjusted, and while the working reliability of the PFC circuit is ensured, the system efficiency is improved, and the device loss is reduced.
In one embodiment of the present invention, as shown in fig. 7, when the number of PFC channels currently running is adjusted according to the new number of PFC channels that need to be turned on, the controller 60 is configured to: comparing the number of the new PFC channels needing to be started with the number of the PFC channels running at present; if the number of the new PFC channels needing to be started is larger than the number of the PFC channels running at present, starting the new PFC channels to increase the number of the PFC channels running at present, wherein the number of the new PFC channels started is the difference value between the number of the new PFC channels needing to be started and the number of the PFC channels running at present; if the number of the new PFC channels needing to be started is smaller than the number of the PFC channels running at present, closing part of the started PFC channels to reduce the number of the PFC channels running at present, wherein the number of the closed PFC channels is the difference value between the number of the PFC channels running at present and the number of the new PFC channels needing to be started.
Specifically, when the load power is constant and the outdoor environment temperature increases, the allowed current of each channel decreases, and at this time, the number of new PFC channels to be started is greater than the number of currently-operating PFC channels, and the new PFC channels need to be started to increase the number of currently-operating PFC channels; when the load power is constant and the outdoor environment temperature is reduced, the allowed current of each channel is increased, the number of the new PFC channels needing to be opened is smaller than the number of the PFC channels running currently, and part of the PFC channels needing to be opened are required to be closed so as to reduce the number of the PFC channels running currently.
In one embodiment of the present invention, the controller 60 is configured to: when a new PFC channel is started to increase the number of the PFC channels currently running, directly controlling the starting of the PFC channels with the new number of the PFC channels; when the number of the PFC channels which are partially opened is reduced by closing the PFC channels which are partially opened, the PFC channels which are partially opened are closed after delaying the first preset time or according to the preset return difference value.
Specifically, when a new PFC channel needs to be opened, the current number of PFC channels is considered to be unable to meet the requirement, which exceeds the load of the current PFC circuit, and in order to ensure the operational reliability of the PFC circuit, the new number of PFC channels needs to be immediately opened, but when a part of the opened PFC channels needs to be closed, the current PFC channel is considered to have redundancy, which may reduce the number of channels to reduce the loss of power devices, improve the efficiency of the air conditioner and the energy efficiency of the whole air conditioner, or may not reduce the number of channels. When the number of channels is not reduced, frequent switching of the channels can be avoided, and the reliability of the power device is improved. Therefore, when the number of the currently operated PFC channels needs to be reduced, a part of the turned-on PFC channels may be turned off after delaying the first preset time or according to a preset back difference value.
In a specific embodiment, a certain return difference may be set for the outdoor environment temperature interval or the current interval, and when the outdoor environment temperature reaches the difference between the lower limit value of the outdoor environment temperature interval and the return difference, or when the input current reaches the interpolation value between the lower limit value of the current interval and the return difference, part of the turned-on PFC channels are turned off again, so as to avoid frequent switching of the channels and improve the reliability of the power device.
It can be understood that the outdoor environment temperature interval, the current interval, the return difference and the first preset time can be determined in advance according to experiments, which are not described herein again.
In one embodiment of the present invention, before acquiring the input current of the air conditioner detected by the multi-channel PFC circuit and the outdoor ambient temperature collected by the outdoor ambient temperature sensor, the controller 60 is further configured to: and controlling all PFC channels to be started for a second preset time.
Specifically, when the air conditioner is started, all the PFC channels are controlled to be started for a second preset time, after the belt system is stabilized, the input current of the air conditioner detected by the multi-channel PFC circuit 40 and the outdoor environment temperature acquired by the outdoor environment temperature sensor 50 are acquired, the number of the PFC channels which need to be started at present is determined according to the input current and the outdoor environment temperature, and the corresponding number of the PFC channels are controlled to be started, so that the stability of the system is improved.
According to the air conditioner provided by the embodiment of the invention, the input current of the air conditioner detected by the multi-channel PFC circuit 40 and the outdoor environment temperature acquired by the outdoor environment temperature sensor 50 are acquired, the number of the PFC channels needing to be started at present is determined according to the input current and the outdoor environment temperature, and the influence of the load current change and the outdoor environment temperature change of the air conditioner on the operation reliability of a power device is considered, so that the reliable operation of the power device such as a triode and the like can be ensured, the utilization rate of each channel can be improved, the opening of unnecessary channels is reduced, the switching loss of the power device is reduced, and the efficiency and the overall energy efficiency of the air conditioner are improved.
A further embodiment of the present invention also discloses a control method of an air conditioner, and fig. 8 is a flowchart of the control method of the air conditioner according to an embodiment of the present invention. As shown in fig. 8, the method comprises the steps of:
the method comprises the following steps that S1, when the air conditioner is started, the input current of the air conditioner detected by a multi-channel PFC circuit and the outdoor environment temperature collected by an outdoor environment temperature sensor are obtained.
And S2, determining the number of PFC channels needing to be opened currently according to the input current and the outdoor environment temperature.
And S3, controlling the PFC channels with corresponding quantity to start and operate.
In one embodiment of the present invention, determining the number of PFC channels that need to be turned on currently according to the input current and the outdoor ambient temperature includes: determining a temperature interval of the outdoor environment temperature; determining a current-PFC channel opening number mapping relation table corresponding to a temperature interval, wherein different current-PFC channel opening number mapping relation tables are calibrated in advance in different temperature intervals; according to the input current, the number of the PFC channels needing to be opened at present is obtained by inquiring a current-PFC channel opening number mapping relation table corresponding to a temperature interval.
In an embodiment of the present invention, according to the input current, by querying a current-PFC channel turn-on number mapping table corresponding to the temperature interval, the method includes: determining a current interval in which the input current is positioned; and determining the number of the PFC channels needing to be started at present according to the current intervals, wherein different current intervals correspond to different numbers of the PFC channels needing to be started.
In an embodiment of the present invention, after controlling the starting operation of the corresponding number of PFC channels, the method further includes: when the input current and/or the outdoor environment temperature change, the number of the PFC channels which are operated currently is adjusted according to the new input current and/or the new outdoor environment temperature.
In one embodiment of the present invention, adjusting the number of currently operating PFC channels according to a new input current and/or a new outdoor ambient temperature comprises: when the temperature interval where the new outdoor environment temperature is located does not change, inquiring a current-PFC channel opening number mapping relation table corresponding to the temperature interval according to the new input current to obtain the new number of PFC channels needing to be opened, and adjusting the number of the PFC channels which are currently operated according to the new number of the PFC channels needing to be opened.
In one embodiment of the present invention, adjusting the number of currently operating PFC channels according to a new input current and/or a new outdoor ambient temperature comprises: when the temperature interval where the new outdoor environment temperature is located changes, a new temperature interval is determined, a new current-PFC channel opening quantity mapping relation table is determined according to the new temperature interval, the new current-PFC channel opening quantity mapping relation table is inquired according to the input current or the new input current, the new number of PFC channels needing to be opened is obtained, and the number of the PFC channels which currently run is adjusted according to the new number of the PFC channels needing to be opened.
In an embodiment of the present invention, adjusting the number of currently operating PFC channels according to the new number of PFC channels that need to be turned on includes: comparing the number of the new PFC channels needing to be started with the number of the PFC channels running at present; if the number of the new PFC channels needing to be started is larger than the number of the PFC channels running at present, starting the new PFC channels to increase the number of the PFC channels running at present, wherein the number of the new PFC channels started is the difference value between the number of the new PFC channels needing to be started and the number of the PFC channels running at present; and if the number of the new PFC channels needing to be opened is smaller than the number of the PFC channels which are operated currently, closing part of the started PFC channels to reduce the number of the PFC channels which are operated currently, wherein the number of the closed PFC channels is the difference between the number of the PFC channels which are operated currently and the number of the new PFC channels needing to be opened.
In one embodiment of the invention, when a new PFC channel is started to increase the number of the PFC channels currently running, the PFC channels of the new PFC channel number are directly controlled to be started; when the number of the PFC channels which are partially opened is reduced by closing the PFC channels which are partially opened, the PFC channels which are partially opened are closed after delaying the first preset time or according to the preset return difference value.
In an embodiment of the present invention, before acquiring the input current of the air conditioner detected by the multi-channel PFC circuit and the outdoor ambient temperature collected by the outdoor ambient temperature sensor, the method further includes: and controlling all PFC channels to be started for a second preset time.
According to the control method of the air conditioner, the input current of the air conditioner detected by the multi-channel PFC circuit and the outdoor environment temperature acquired by the outdoor environment temperature sensor are obtained, the number of the PFC channels needing to be started at present is determined according to the input current and the outdoor environment temperature, and meanwhile, the influence of the load current change and the outdoor environment temperature change of the air conditioner on the operation reliability of the power device is considered, so that the reliable operation of the power devices such as a triode and the like can be ensured, the utilization rate of each channel can be improved, the opening of unnecessary channels is reduced, the switching loss of the power device is reduced, and the efficiency and the overall energy efficiency of the air conditioner are improved.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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, 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 is arranged in the shell and is used for enabling a refrigerant to circulate in a loop formed by the compressor, the condenser, the electronic expansion valve, the evaporator, the four-way valve and the pressure reducer;
a refrigeration system that performs heat exchange between a refrigerant and indoor air in a compression refrigeration cycle of the refrigerant circulation circuit, the refrigeration system including a compressor that performs work of compressing a low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas and discharging the refrigerant gas to the condenser;
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;
an outdoor environment temperature sensor for acquiring outdoor environment temperature;
the controller is configured to: when the air conditioner is started, the input current of the air conditioner detected by the multi-channel PFC circuit and the outdoor environment temperature collected by the outdoor environment temperature sensor are obtained, the number of the PFC channels needing to be started at present is determined according to the input current and the outdoor environment temperature, and the corresponding number of the PFC channels are controlled to be started.
2. The air conditioner of claim 1, wherein when determining the number of the PFC channels that currently need to be turned on based on the input current and the outdoor ambient temperature, the controller is configured to:
determining a temperature interval in which the outdoor environment temperature is located;
determining a current-PFC channel opening number mapping relation table corresponding to the temperature interval, wherein different current-PFC channel opening number mapping relation tables are calibrated in advance in different temperature intervals;
and according to the input current, obtaining the number of the PFC channels needing to be opened at present by inquiring a current-PFC channel opening number mapping relation table corresponding to the temperature interval.
3. The air conditioner according to claim 2, wherein the controller is configured to, when referring to a current-PFC channel opening number mapping table corresponding to the temperature section according to the input current,:
determining a current interval in which the input current is positioned;
and determining the number of the PFC channels needing to be started currently according to the current intervals, wherein different current intervals correspond to different numbers of the PFC channels needing to be started.
4. The air conditioner according to claim 3, wherein after controlling the respective number of PFC channels to be on for operation, the controller is further configured to:
when the input current and/or the outdoor environment temperature change, the number of the PFC channels which are operated currently is adjusted according to the new input current and/or the new outdoor environment temperature.
5. The air conditioner as claimed in claim 4, wherein when the number of currently operating PFC channels is adjusted according to a new input current and/or a new outdoor ambient temperature, the controller is configured to:
when the temperature interval where the new outdoor environment temperature is located does not change, inquiring a current-PFC channel opening number mapping relation table corresponding to the temperature interval according to the new input current to obtain the new number of the PFC channels needing to be opened, and adjusting the number of the PFC channels which are currently operated according to the new number of the PFC channels needing to be opened.
6. The air conditioner as claimed in claim 4, wherein when the number of currently operating PFC channels is adjusted according to a new input current and/or a new outdoor ambient temperature, the controller is configured to:
when the temperature interval where the new outdoor environment temperature is located changes, determining a new temperature interval, determining a new current-PFC channel opening number mapping relation table according to the new temperature interval, inquiring the new current-PFC channel opening number mapping relation table according to the input current or the new input current to obtain the new number of the PFC channels needing to be opened, and adjusting the number of the PFC channels which currently run according to the new number of the PFC channels needing to be opened.
7. The air conditioner according to claim 5 or 6, wherein when the number of the currently-operating PFC channels is adjusted according to the new number of the PFC channels that need to be turned on, the controller is configured to:
comparing the number of the new PFC channels needing to be started with the number of the current operation PFC channels;
if the number of the new PFC channels needing to be started is larger than the number of the current operation PFC channels, starting the new PFC channels to increase the number of the current operation PFC channels, wherein the number of the new PFC channels needing to be started is the difference value between the number of the new PFC channels needing to be started and the number of the current operation PFC channels;
if the number of the new PFC channels needing to be started is smaller than the number of the PFC channels running at present, closing part of the started PFC channels to reduce the number of the PFC channels running at present, wherein the number of the closed PFC channels is the difference value between the number of the PFC channels running at present and the new number of the PFC channels needing to be started.
8. The air conditioner of claim 7, wherein the controller is configured to:
when a new PFC channel is started to increase the number of the PFC channels in current operation, directly controlling the starting of the PFC channels with the new PFC channel number;
and when the partially opened PFC channels are closed to reduce the number of the currently operated PFC channels, the partially opened PFC channels are closed after delaying for a first preset time or according to a preset return difference value.
9. The air conditioner of claim 1, wherein prior to obtaining the input current of the air conditioner detected by the multi-channel PFC circuit and the outdoor ambient temperature collected by the outdoor ambient temperature sensor, the controller is further configured to:
and controlling all PFC channels to be started for a second preset time.
10. A method of controlling an air conditioner, comprising:
when the air conditioner is started, acquiring input current of the air conditioner detected by a multi-channel PFC circuit and outdoor environment temperature acquired by an outdoor environment temperature sensor;
determining the number of PFC channels needing to be opened currently according to the input current and the outdoor environment temperature;
and controlling the PFC channels of corresponding quantity to start running.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211498814.3A CN115711475A (en) | 2022-11-28 | 2022-11-28 | Air conditioner and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211498814.3A CN115711475A (en) | 2022-11-28 | 2022-11-28 | Air conditioner and control method thereof |
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| CN115711475A true CN115711475A (en) | 2023-02-24 |
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| CN202211498814.3A Pending CN115711475A (en) | 2022-11-28 | 2022-11-28 | Air conditioner and control method thereof |
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