Method for reducing low-frequency operation loss of air conditioner, air conditioner and storage medium

Abstract

The invention provides a method for reducing low-frequency operation loss of an air conditioner, the air conditioner and a storage medium, and the method comprises the following steps: when the air conditioner operates in a refrigeration mode or a heating mode, determining whether the condition of entering a preset low-frequency energy-saving mode is met according to the frequency of a compressor or the direct-current bus current of an inverter circuit; entering a preset low-frequency energy-saving mode for operation; and when the compressor operates in the preset low-frequency energy-saving mode, the indoor environment temperature when the compressor enters the preset low-frequency energy-saving mode is obtained to serve as the energy-saving target temperature, and the target energy-saving frequency of the compressor is determined according to the energy-saving target temperature and the real-time indoor environment temperature. By means of the method for reducing the low-frequency operation loss of the air conditioner, the loss of the air conditioner in the low-frequency small-power operation mode can be low.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners. Specifically, it relates to a method for reducing the low-frequency operation loss of an air conditioner, and also relates to an air conditioner applying the method for reducing the low-frequency operation loss of an air conditioner, and further relates to a computer-readable storage medium applying the method for reducing the low-frequency operation loss of an air conditioner. Background Art

[0002] At present, the development of household variable-frequency air conditioners has been very mature, and how to pursue the ultimate energy efficiency of air conditioners has always been the goal pursued by each manufacturer.

[0003] In an existing air conditioner control method, in order to reduce power consumption, it is determined whether the operating conditions meet the entry conditions for entering the low-frequency operation state by monitoring. If so, it enters the low-frequency operation. During the low-frequency operation, according to the difference between the indoor temperature and the target temperature, the target operating frequency is determined in a preset control scheme, so as to play a role in reducing power consumption. However, in this scheme, when determining whether to enter the low-frequency mode, it is determined by the temperature ranges of the indoor temperature and the outdoor temperature. However, there is a certain lag in temperature detection, and the switching timing is not accurate enough. Moreover, when this scheme enters the low-frequency mode, it still operates at the target temperature set by the user, and the loss of the air conditioner controller is relatively large.

[0004] Therefore, a more optimized method for reducing the low-frequency operation loss of an air conditioner needs to be considered. Summary of the Invention

[0005] The first object of the present invention is to provide a method for reducing the low-frequency operation loss of an air conditioner, which enables the air conditioner to have a lower loss in the low-frequency small-power operation mode.

[0006] The second object of the present invention is to provide an air conditioner, which enables the air conditioner to have a lower loss in the low-frequency small-power operation mode.

[0007] The third object of the present invention is to provide a computer-readable storage medium, which enables the air conditioner to have a lower loss in the low-frequency small-power operation mode.

[0008] In order to achieve the above first object, the method for reducing the low-frequency operation loss of an air conditioner provided by the present invention includes: when operating in the cooling mode or the heating mode, it is confirmed whether the conditions for entering the preset low-frequency energy-saving mode are met according to the compressor frequency or the DC bus current of the inverter circuit. If so, it enters the preset low-frequency energy-saving mode for operation; when operating in the preset low-frequency energy-saving mode, the indoor ambient temperature when entering the preset low-frequency energy-saving mode is obtained as the energy-saving target temperature, and the target energy-saving frequency of the compressor is determined according to the energy-saving target temperature and the real-time indoor ambient temperature.

[0009] As can be seen from the above solution, the method for reducing the low-frequency operation loss of the air conditioner according to the present invention determines the timing of entering the preset low-frequency energy-saving mode based on the compressor frequency or the DC bus current of the inverter circuit, which can improve the accuracy of entering the low-frequency energy-saving mode, thereby reducing energy consumption. At the same time, taking the indoor environmental temperature when entering the energy-saving mode as the target temperature, and combining the real-time temperature feedback to adjust the frequency of the compressor, making the indoor temperature fluctuate less. While maintaining the temperature stability, it significantly reduces the waste of electric energy, and makes the loss of the air conditioner in the low-frequency and low-power operation mode lower.

[0010] In a further solution, the step of determining the target energy-saving frequency of the compressor according to the energy-saving target temperature and the real-time indoor temperature includes: obtaining the temperature difference between the energy-saving target temperature and the current indoor environmental temperature, and obtaining the change amount of the temperature difference within a preset time period; determining the target energy-saving frequency according to the temperature difference and the change amount of the temperature difference.

[0011] In a further solution, the target energy-saving frequency F ECO is obtained by the following formula ECO = f + △F × n; where f is the current operating frequency of the compressor, △F is the preset frequency change amount, and the coefficient n is determined by the temperature difference and the change amount of the temperature difference.

[0012] Thus, by the difference between the energy-saving target temperature and the current indoor environmental temperature, as well as the change amount of the temperature difference within a preset time period, the target energy-saving frequency is determined through the information of these two dimensions, avoiding the inaccurate adjustment problem that may be caused by adjusting only based on a single temperature difference. It can not only ensure that the air-conditioning system effectively reduces energy consumption in the energy-saving mode, but also keeps the indoor temperature stable within a relatively comfortable range. It avoids the problem that the excessive energy saving causes the indoor temperature to fluctuate too much and affects the user comfort.

[0013] In a further solution, when operating in the preset low-frequency energy-saving mode, at least one of the following is executed: the gear of the indoor fan is maintained at the gear when entering the preset low-frequency energy-saving mode; the windshield of the indoor unit is maintained at the angle when entering the preset low-frequency energy-saving mode; the indoor unit is maintained at the swing state when entering the preset low-frequency energy-saving mode.

[0014] Thus, randomly changing the gear of the indoor fan, the angle of the windshield or the swing state after entering the preset low-frequency energy-saving mode may cause the fan to consume additional energy to adjust the operating state. Keeping these parameters unchanged avoids unnecessary energy consumption and further enhances the energy-saving effect of the air-conditioning system in the low-frequency energy-saving mode.

[0015] In a further solution, when operating in the preset low-frequency energy-saving mode, the outdoor fan is maintained at the control logic when entering the preset low-frequency energy-saving mode, and / or the electronic expansion valve is maintained at the control logic when entering the preset low-frequency energy-saving mode.

[0016] It can be seen that if the control logics of the outdoor fan and the electronic expansion valve are frequently changed after entering the energy-saving mode, it may cause significant changes in their operating states, thereby leading to fluctuations in energy consumption. Maintaining the original control logic enables the outdoor fan and the electronic expansion valve to operate in a relatively stable state, effectively avoiding the additional increase in energy consumption caused by adjustment, further enhancing the energy-saving effect of the air-conditioning system in the low-frequency energy-saving mode, and achieving more stable energy-saving operation.

[0017] In a further solution, before confirming whether the conditions for entering the preset low-frequency energy-saving mode are met according to the compressor frequency or the DC bus current of the inverter circuit, it further includes: confirming the first preset duration of entering the cooling mode or the heating mode.

[0018] It can be seen that after confirming that the first preset duration of entering the cooling mode or the heating mode is reached, the system has basically stabilized. At this time, judging whether to enter the low-frequency energy-saving mode according to the compressor frequency or the DC bus current can avoid misjudgment caused by the system not being stable yet.

[0019] In a further solution, the air conditioner includes a DC-DC conversion circuit. The DC-DC conversion circuit includes a full-bridge rectifier circuit, a Boost PFC circuit, and a flyback switching power supply circuit. The full-bridge rectifier circuit, the Boost PFC circuit, and the flyback switching power supply circuit are cascaded; the Boost PFC circuit is provided with a first power switch tube, and the flyback switching power supply circuit is provided with a second power switch tube; a first switching switch is arranged between the source electrode of the first power switch tube and the DC bus, and a second switching switch is arranged between the first power switch tube and the second power switch tube; the method further includes: when operating in the preset low-frequency energy-saving mode, controlling the first switching switch to be disconnected and the second switching switch to be closed.

[0020] It can be seen that in the preset low-frequency energy-saving mode, controlling the first switching switch to be disconnected can avoid unnecessary power loss of this part of the circuit because the Boost PFC circuit where the first power switch tube is located does not need to work at full load such as high power factor correction when the air conditioner operates at low frequency. And the second switching switch is closed, enabling the flyback switching power supply circuit to continue to provide appropriate power for necessary control circuits, etc., reducing the power consumption of the overall DC-DC conversion circuit while meeting the basic functional requirements, and achieving the energy-saving effect.

[0021] In a further solution, when the compressor frequency is less than the preset frequency, or when the DC bus current of the inverter circuit is less than the preset current, it is confirmed that the conditions for entering the preset low-frequency energy-saving mode are met.

[0022] It can be seen that the compressor frequency and the DC bus current of the inverter circuit are key parameters that can intuitively reflect the operating load of the air-conditioning system. When the compressor frequency is less than the preset frequency, it means that the working intensity of the compressor is reduced, and at this time, the system's demand for refrigeration or heating is relatively small; similarly, when the DC bus current of the inverter circuit is less than the preset current, it also indicates that the current power demand of the system is low. By monitoring these two parameters to determine whether to enter the low-frequency energy-saving mode, a decision can be made based on the actual load situation of the system, making the triggering of the energy-saving mode more reasonable and scientific.

[0023] In a further solution, after entering the preset low-frequency energy-saving mode for operation, it further includes: determining whether the conditions for exiting the preset low-frequency energy-saving mode are met. If so, exit the preset low-frequency energy-saving mode and operate in the operating state when entering the preset low-frequency energy-saving mode.

[0024] It can be seen that the temperature demand of the indoor environment changes with factors such as time and human activities. By determining whether the conditions for exiting the preset low-frequency energy-saving mode are met, the air conditioner can flexibly adjust its operating state according to actual needs. When the change in indoor temperature leads to an increase in the demand for refrigeration or heating and the exit conditions are met, the air conditioner promptly exits the energy-saving mode and resumes its previous operating state, ensuring that the indoor temperature can quickly reach the comfortable level expected by the user and improving the user experience.

[0025] To achieve the second object of the present invention, the present invention provides an air conditioner including a processor and a memory. The memory stores a computer program, and when the computer program is executed by the processor, the steps of the method for reducing the low-frequency operation loss of the air conditioner described above are implemented.

[0026] To achieve the third object of the present invention, the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a controller, the steps of the method for reducing the low-frequency operation loss of the air conditioner described above are implemented. Description of the Drawings

[0027] Figure 1 is a flowchart of an embodiment of the method for reducing the low-frequency operation loss of the air conditioner of the present invention.

[0028] Figure 2 is a flowchart of the steps of entering the preset low-frequency energy-saving mode for operation in an embodiment of the method for reducing the low-frequency operation loss of the air conditioner of the present invention.

[0029] Figure 3 is a flowchart of the steps of determining the target energy-saving frequency of the compressor according to the energy-saving target temperature and the real-time indoor temperature in an embodiment of the method for reducing the low-frequency operation loss of the air conditioner of the present invention.

[0030] Figure 4It is the circuit schematic diagram of the DC-DC conversion circuit in the embodiment of the method for reducing the low-frequency operation loss of the present invention in an air conditioner.

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. Specific embodiments

[0032] The method for reducing the low-frequency operation loss of the present invention is a computer program applied to an air conditioner and is used for controlling the low-frequency operation of the air conditioner.

[0033] Embodiment of the method for reducing the low-frequency operation loss of an air conditioner:

[0034] As Figure 1 shown, in this embodiment, when the method for reducing the low-frequency operation loss of an air conditioner is working, it first executes step S1 and operates in the cooling mode or the heating mode. When the user needs to cool or heat, the user sends an instruction for the cooling mode or the heating mode to the air conditioner through devices such as an air conditioner remote control, a control panel, or a smart terminal. After the air conditioner receives the user's mode selection instruction, it cools or heats according to the target temperature set by the user.

[0035] After entering the cooling mode or the heating mode, step S2 is executed to determine whether the cooling mode or the heating mode has entered for a first preset duration. After confirming entering the cooling mode or the heating mode, the control system starts timing and monitors whether the first preset duration is reached. The first preset duration is to ensure the stable operation of the air conditioner system before entering the subsequent judgment process, and this duration can be adjusted according to the type and performance of the air conditioner, and is generally set to 5 minutes to 10 minutes.

[0036] When it is not confirmed that the cooling mode or the heating mode has entered for the first preset duration, step S1 is continued to perform continuous cooling or heating. When it is confirmed that the cooling mode or the heating mode has entered for the first preset duration, step S3 is executed to confirm whether the conditions for entering the preset low-frequency energy-saving mode are met according to the compressor frequency or the DC bus current of the inverter circuit.

[0037] In this embodiment, when the compressor frequency is less than the preset frequency, or when the DC bus current of the inverter circuit is less than the preset current, it is confirmed that the conditions for entering the preset low-frequency energy-saving mode are met. The preset frequency and the preset current can be set in advance according to experimental data. For example, for air conditioner models of 1 HP to 1.5 HP, the preset frequency is 50 Hz and the preset current is 4 A.

[0038] The compressor frequency and the DC bus current of the inverter circuit are key parameters that can intuitively reflect the operating load of the air-conditioning system. When the compressor frequency is less than the preset frequency, it means that the working intensity of the compressor is reduced, and at this time, the system's demand for refrigeration or heating is relatively small; similarly, when the DC bus current of the inverter circuit is less than the preset current, it also indicates that the current power demand of the system is low. By monitoring these two parameters to determine whether to enter the low-frequency energy-saving mode, a decision can be made based on the actual load situation of the system, making the triggering of the energy-saving mode more reasonable and scientific.

[0039] If it is confirmed that the conditions for entering the preset low-frequency energy-saving mode are not met, then continue to execute step S3 for continuous detection. If it is confirmed that the conditions for entering the preset low-frequency energy-saving mode are met, execute step S4 to enter the preset low-frequency energy-saving mode for operation. By entering the preset low-frequency energy-saving mode, the compressor frequency is reduced, the energy consumption of the compressor is reduced, and at the same time, the overall energy consumption is reduced to achieve the purpose of energy saving.

[0040] See Figure 2 , in this embodiment, when entering the preset low-frequency energy-saving mode for operation, first execute step S11 to obtain the indoor environmental temperature when entering the preset low-frequency energy-saving mode as the energy-saving target temperature. When the conditions for entering the preset low-frequency energy-saving mode are met, the control system will immediately read the indoor environmental temperature value collected by the temperature sensor at this time, use it as the energy-saving target temperature and store it in the memory, so that subsequent temperature control operations can be adjusted based on this temperature as a reference. Different usage scenarios and users have different demands for indoor temperature. Taking the current indoor environmental temperature as the energy-saving target can better adapt to the specific usage environment and user preferences, and achieve personalized energy-saving control on the premise of meeting comfort, avoiding energy waste caused by excessive refrigeration or heating.

[0041] After obtaining the energy-saving target temperature, execute step S12 to determine the target energy-saving frequency of the compressor according to the energy-saving target temperature and the real-time indoor environmental temperature. Using the energy-saving target temperature and the real-time indoor environmental temperature, set the target energy-saving frequency of the compressor, so that the operating frequency of the compressor can be controlled in a suitable state.

[0042] In this embodiment, see Figure 3 , when determining the target energy-saving frequency of the compressor according to the energy-saving target temperature and the real-time indoor environmental temperature, first execute step S21 to obtain the temperature difference between the energy-saving target temperature and the current indoor environmental temperature, and obtain the temperature difference change amount within the preset time period. Among them, the preset time period can be set in advance according to experimental data. For example, the preset time period is 1 minute. In the cooling mode, the temperature difference △T between the energy-saving target temperature T 内环_ECO and the current indoor environmental temperature T 内环 is: △T = T 内环 – T 内环_ECO。In the heating mode, the energy-saving target temperature T 内环_ECO and the current indoor ambient temperature T 内环 The temperature difference △T is: △T = T 内环_ECO – Tinner loop.

[0043] After obtaining the temperature difference, step S22 is executed to determine the target energy-saving frequency according to the temperature difference and the temperature difference change amount. By the difference between the energy-saving target temperature and the current indoor ambient temperature, as well as the temperature difference change amount within a preset time period, the target energy-saving frequency is determined through the information of these two dimensions, avoiding the inaccurate adjustment problem that may be caused by adjusting only based on a single temperature difference. It can not only ensure that the air-conditioning system effectively reduces energy consumption in the energy-saving mode, but also keep the indoor temperature stable within a relatively comfortable range. It avoids the problem that the excessive energy saving causes the indoor temperature to fluctuate too much and affects the user comfort.

[0044] In this embodiment, the target energy-saving frequency F ECO is obtained by the following formula F ECO = f + △F × n; where f is the current operating frequency of the compressor, △F is the preset frequency change amount, and the coefficient n is determined by the temperature difference and the temperature difference change amount. △F can be set corresponding to the cooling mode and the heating mode. For example, △F1 is the frequency change amount in the cooling mode, and △F2 is the frequency change amount in the heating mode. Then the target energy-saving frequency F ECO is obtained by the following formula F ECO = f + △F1 × n, and the target energy-saving frequency F ECO is obtained by the following formula F ECO = f + △F2 × n.

[0045] In this embodiment, the coefficient n can be obtained by looking up a table according to the temperature difference and the temperature difference change amount. In a specific example, as shown in the following table:

[0046]

[0047] In addition, in this embodiment, when operating in the preset low-frequency energy-saving mode, at least one of the following is executed: the gear of the indoor fan is maintained at the gear when entering the preset low-frequency energy-saving mode; the wind deflector of the indoor unit is maintained at the angle when entering the preset low-frequency energy-saving mode; the indoor unit maintains the swing state when entering the preset low-frequency energy-saving mode. Randomly changing the gear of the indoor fan, the angle of the wind deflector or the swing state after entering the preset low-frequency energy-saving mode may cause the fan to consume additional energy to adjust the operating state. Keeping these parameters unchanged avoids unnecessary energy consumption and further enhances the energy-saving effect of the air-conditioning system in the low-frequency energy-saving mode.

[0048] In addition, in this embodiment, when operating in the preset low-frequency energy-saving mode, the outdoor fan maintains the control logic when entering the preset low-frequency energy-saving mode, and / or the electronic expansion valve maintains the control logic when entering the preset low-frequency energy-saving mode. If the control logics of the outdoor fan and the electronic expansion valve are frequently changed after entering the energy-saving mode, it may cause significant changes in their operating states, thereby leading to fluctuations in energy consumption. Keeping the original control logic enables the outdoor fan and the electronic expansion valve to operate in a relatively stable state, effectively avoiding the additional increase in energy consumption caused by adjustment, further improving the energy-saving effect of the air-conditioning system in the low-frequency energy-saving mode, and achieving more stable energy-saving operation. Of course, if the control logics of the outdoor fan and the electronic expansion valve need to adjust parameters using the target temperature and the target frequency of the compressor, the target temperature and the target frequency of the compressor can be used for adjustment.

[0049] In an alternative embodiment, referring to Figure 4 , the air conditioner includes a DC-DC conversion circuit. The DC-DC conversion circuit includes a full-bridge rectifier circuit 1, a Boost PFC circuit 2, and a flyback switching power supply circuit 3, and the full-bridge rectifier circuit 1, the Boost PFC circuit 2, and the flyback switching power supply circuit 3 are cascaded. The Boost PFC circuit 2 is provided with a first power switch tube V1, and the flyback switching power supply circuit 3 is provided with a second power switch tube V2. Preferably, both the first power switch tube V1 and the second power switch tube V2 are NMOS tubes. A first switching switch S1 is provided between the source electrode of the first power switch tube V1 and the DC bus, and a second switching switch S2 is provided between the source electrode of the first power switch tube V1 and the drain electrode of the second power switch tube V2. The DC-DC conversion circuit is further provided with a soft-switching capacitor Cr and a soft-switching inductor Lr. The soft-switching capacitor Cr is connected in parallel with the second switching switch S2, and the soft-switching inductor Lr is connected in series with the second switching switch S2. Among them, the Boost PFC circuit 2 is composed of a power inductor L1, a first power switch tube V1, and a power diode D5. The flyback switching power supply circuit 3 is composed of a transformer T, a second power switch tube V2, a secondary fast-recovery diode D6, an output capacitor C2, and an output load. C1 is a large electrolytic capacitor for the DC bus.

[0050] The first switching switch S1 and the second switching switch S2 act synchronously at all switching moments, including switching from a preset low-frequency energy-saving mode to a normal operation mode and from the normal operation mode to the preset low-frequency energy-saving mode. When the air conditioner is in the normal operation mode, the first switching switch S1 is closed and the second switching switch S2 is open. At this moment, the first power switch tube V1 and the second power switch tube V2 act independently. The first power switch tube V1, a high-frequency switch tube, meets the switching conditions of the Boost PFC circuit 2, and the second power switch tube V2 meets the switching conditions of the flyback switching power supply circuit 3. When the air conditioner meets the preset low-frequency energy-saving mode, a switching action occurs. The first switching switch S1 is open and the second switching switch S2 is closed. After the switching is completed, the first power switch tube V1 and the second power switch tube V2 act synchronously. The first power switch tube V1 meets the working conditions of the power diode at the corresponding position of the single-stage PFC, and the second power switch tube V2 meets the working conditions of the high-frequency switch tube of the single-stage PFC.

[0051] When operating in the preset low-frequency energy-saving mode, the specific working principle of the circuit is as follows: In each cycle, the second power switch tube V2 conducts with a certain duty cycle. When the second power switch tube V2 is in the conducting moment, the first power switch tube V1 also conducts. The rectified current charges the power inductor L1 through the loop of the power inductor L1, the first power switch tube V1, the second switching switch S2, and the second power switch tube V2. At the same time, the large electrolytic capacitor C1 on the DC bus is also charging, and the large electrolytic capacitor C1 on the DC bus stores energy for the transformer T through discharging. When the first power switch tube V1 is in the off moment, the electrical energy stored in the power inductor L1, the large electrolytic capacitor C1 on the DC bus, and the transformer T is released to the secondary circuit at the moment of turn-off. During operation, the duty cycle of the first power switch tube V1 is determined by the voltage regulator output by the secondary main feedback. Under a certain load (low power, light load), the voltage across the large electrolytic capacitor C1 on the DC bus remains basically unchanged, and the duty cycles of the first power switch tube V1 and the second power switch tube V2 are also basically constant.

[0052] In the preset low-frequency energy-saving mode, control the first switching switch S1 to be open. Since the Boost PFC circuit 2 where the first power switch tube V1 is located does not require full-load working states such as high power factor correction when the air conditioner operates at low frequency, disconnecting it can avoid unnecessary power loss in this part of the circuit. And the second switching switch S2 is closed, enabling the flyback switching power supply circuit 3 to continue to provide a suitable power supply for necessary control circuits, etc. While meeting the basic functional requirements, the power consumption of the overall DC-DC conversion circuit is reduced, achieving an energy-saving effect.

[0053] After entering the preset low-frequency energy-saving mode for operation, step S5 is executed to determine whether the conditions for exiting the preset low-frequency energy-saving mode are met. The conditions for exiting the preset low-frequency energy-saving mode can be set as needed. For example, when the compressor frequency and the DC bus current of the inverter circuit do not meet the conditions for entering the preset low-frequency energy-saving mode, it is considered that the conditions for exiting the preset low-frequency energy-saving mode are met.

[0054] If the conditions for exiting the preset low-frequency energy-saving mode are not met, step S4 is continued to operate in the preset low-frequency energy-saving mode. If the conditions for exiting the preset low-frequency energy-saving mode are met, step S6 is executed to exit the preset low-frequency energy-saving mode and operate in the operating state when entering the preset low-frequency energy-saving mode. The temperature demand of the indoor environment changes with factors such as time and human activities. By judging whether the conditions for exiting the preset low-frequency energy-saving mode are met, the air conditioner can flexibly adjust its operating state according to actual needs. When the change in indoor temperature leads to an increase in the demand for cooling or heating and the exit conditions are met, the air conditioner promptly exits the energy-saving mode and returns to the operating state before entering the preset low-frequency energy-saving mode, ensuring that the indoor temperature can quickly reach the comfortable level expected by the user and improving the user experience.

[0055] As can be seen from the above, the method for reducing the low-frequency operation loss of the air conditioner according to the present invention can improve the accuracy of entering the preset low-frequency energy-saving mode by determining the timing of entering the preset low-frequency energy-saving mode based on the compressor frequency or the DC bus current of the inverter circuit, thereby reducing energy consumption. At the same time, using the ambient temperature when entering the energy-saving mode as the target temperature and adjusting the frequency of the compressor in combination with real-time temperature feedback makes the indoor temperature fluctuate less. While maintaining temperature stability, it significantly reduces power waste and makes the loss of the air conditioner in the low-frequency small-power operation mode lower.

[0056] Air conditioner embodiment:

[0057] The air conditioner of this embodiment includes a controller, and when the controller executes a computer program, it implements the steps in the method embodiment for reducing the low-frequency operation loss of the air conditioner described above.

[0058] For example, the computer program can be divided into one or more modules, and one or more modules are stored in the memory and executed by the controller to complete the present invention. One or more modules can be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program in the air conditioner.

[0059] The air conditioner may include, but is not limited to, a controller and a memory. Those skilled in the art can understand that the air conditioner may include more or fewer components, or combine certain components, or different components. For example, the air conditioner may also include input and output devices, network access devices, a bus, etc.

[0060] For example, the controller can be a Central Processing Unit (CPU), or it can also be other general-purpose controllers, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose controller can be a microcontroller or any conventional controller, etc. The controller is the control center of the air conditioner and connects all parts of the entire air conditioner using various interfaces and circuits.

[0061] The memory can be used to store computer programs and / or modules. By running or executing the computer programs and / or modules stored in the memory, and by calling the data stored in the memory, the controller realizes various functions of the air conditioner. For example, the memory may mainly include a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function (such as a voice reception function, a voice-to-text conversion function, etc.); the data storage area can store data created according to the use of the mobile phone (such as audio data, text data, etc.). In addition, the memory can include high-speed random access memory, and can also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, Flash Card, at least one magnetic disk storage device, flash device, or other volatile solid-state storage devices.

[0062] Examples of computer-readable storage media:

[0063] If the modules integrated in the air conditioner of the above embodiments are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, all or part of the processes in the method embodiments for reducing the low-frequency operation loss of the air conditioner can also be completed by instructing relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a controller, the steps of the method embodiments for reducing the low-frequency operation loss of the air conditioner can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The storage medium can include: any entity or device capable of carrying computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the content included in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0064] It should be noted that the above are only the preferred embodiments of the present invention, but the design concept of the invention is not limited thereto. Any non-substantive modifications made to the present invention using this concept also fall within the protection scope of the present invention.

Claims

1. A method for reducing the low-frequency operation loss of an air conditioner, applied to an air conditioner, characterized in that: include: When operating in cooling mode or heating mode, determine whether the conditions for entering the preset low-frequency energy-saving mode are met according to the compressor frequency or the DC bus current of the inverter circuit. If so, enter the preset low-frequency energy-saving mode; When operating in the preset low-frequency energy-saving mode, the indoor ambient temperature when entering the preset low-frequency energy-saving mode is obtained as the energy-saving target temperature, and the target energy-saving frequency of the compressor is determined according to the energy-saving target temperature and the real-time indoor ambient temperature.

2. The method for reducing the low-frequency operation loss of an air conditioner according to claim 1, characterized in that: The step of determining the target energy-saving frequency of the compressor according to the energy-saving target temperature and the real-time indoor temperature comprises: Obtaining the temperature difference between the energy-saving target temperature and the current indoor ambient temperature, and obtaining the change in the temperature difference within a preset time period; The target energy-saving frequency is determined according to the temperature difference and the temperature difference variation.

3. The method for reducing the low-frequency operation loss of an air conditioner according to claim 2, characterized in that: The target energy-saving frequency F ECO Obtained by the following formula: F ECO =f+△F×n; Wherein, f is the current operating frequency of the compressor, ΔF is the preset frequency change, and the coefficient n is determined by the temperature difference and the temperature difference change.

4. The method for reducing the low-frequency operation loss of an air conditioner according to any one of claims 1 to 3, characterized in that: When operating in the preset low-frequency energy-saving mode, do at least one of the following: The gear position of the indoor fan is maintained at the gear position when entering the preset low-frequency energy-saving mode; The wind shield of the indoor unit is maintained at the angle when entering the preset low-frequency energy-saving mode; The indoor unit maintains the wind sweeping state when entering the preset low-frequency energy-saving mode.

5. The method for reducing the low-frequency operation loss of an air conditioner according to any one of claims 1 to 3, characterized in that: When operating in the preset low-frequency energy-saving mode, the outdoor fan maintains the control logic when entering the preset low-frequency energy-saving mode, and / or the electronic expansion valve maintains the control logic when entering the preset low-frequency energy-saving mode.

6. The method for reducing the low-frequency operation loss of an air conditioner according to any one of claims 1 to 3, characterized in that: Before confirming whether the condition for entering the preset low-frequency energy-saving mode is met according to the compressor frequency or the DC bus current of the inverter circuit, the following is also included: Confirming entering the cooling mode or the heating mode for a first preset time.

7. The method for reducing the low-frequency operation loss of an air conditioner according to any one of claims 1 to 3, wherein the air conditioner comprises a DC-DC conversion circuit, the DC-DC conversion circuit comprises a full-bridge rectifier circuit, a Boost PFC circuit and a flyback switching power supply circuit, the full-bridge rectifier circuit, the Boost PFC circuit and the flyback switching power supply circuit are cascaded; the Boost PFC circuit is provided with a first power switch tube, and the flyback switching power supply circuit is provided with a second power switch tube; characterized in that: A first switch is provided between the source of the first power switch tube and the DC bus, and a second switch is provided between the first power switch tube and the second power switch tube; The method further comprises: When operating in the preset low-frequency energy-saving mode, the first switch is controlled to be opened and the second switch is controlled to be closed.

8. The method for reducing the low-frequency operation loss of an air conditioner according to any one of claims 1 to 3, characterized in that: When the compressor frequency is less than a preset frequency, or when the DC bus current of the inverter circuit is less than a preset current, it is confirmed that the condition for entering the preset low-frequency energy-saving mode is met.

9. The method for reducing the low-frequency operation loss of an air conditioner according to any one of claims 1 to 3, characterized in that: After entering the preset low-frequency energy-saving mode, it also includes: Determine whether a condition for exiting the preset low-frequency energy-saving mode is met, and if so, exit the preset low-frequency energy-saving mode and operate in the operating state when entering the preset low-frequency energy-saving mode.

10. An air conditioner, comprising a processor and a memory, characterized in that: The memory stores a computer program, and when the computer program is executed by the processor, the steps of the method for reducing the low-frequency operation loss of the air conditioner as described in any one of claims 1 to 9 are implemented.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the controller, the steps of the method for reducing the low-frequency operation loss of the air conditioner as described in any one of claims 1 to 9 are implemented.

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