Air conditioner

Abstract

The air conditioner comprises a rectifying circuit, a motor load and a control module, the rectifying circuit is used for rectifying alternating-current voltage provided by a power supply to obtain direct-current voltage, the motor load operates based on the direct-current voltage, and the control module controls the motor load to operate on the basis of the direct-current voltage when the motor load is in a shutdown state. Acquiring a first input voltage provided by the power supply, analyzing a third harmonic of the first input voltage to obtain a first characteristic value, acquiring a second input voltage provided by the power supply and analyzing a third harmonic of the second input voltage to obtain a second characteristic value under the condition that the motor load is in the running state, and the control module calculates the change information of the second characteristic value relative to the first characteristic value, and determines the running power range of the motor load according to the change interval to which the change information belongs, so that the phenomenon that the air conditioner stops running unexpectedly is reduced, and the running reliability of the air conditioner is improved.

Description

Technical Field

[0001] This application relates to the technical field of household appliances, and particularly to an air conditioner. Background Art

[0002] In some areas with underdeveloped power grids, the power grid is unstable, and problems such as low grid voltage (undervoltage) or short-term power outages often occur. In order to ensure the normal operation of electrical equipment, users often use private generators (such as gasoline generators, diesel generators, etc.) to temporarily supply power to air conditioners, and the proportion of private generators in power supply in these areas is relatively high.

[0003] However, during the process of supplying power to the air conditioner through a private generator, the air conditioner may experience unexpected shutdown, and the operating reliability of the air conditioner is relatively low. Summary of the Invention

[0004] Embodiments of this application disclose an air conditioner, which can reduce the occurrence of unexpected shutdown of the air conditioner and improve the operating reliability of the air conditioner.

[0005] Embodiments of this application provide an air conditioner, including:

[0006] A rectification circuit, configured to be connected to a power supply and rectify the AC voltage provided by the power supply to obtain a DC voltage;

[0007] A motor load, connected to the rectification circuit, and the motor load is configured to operate based on the DC voltage;

[0008] A control module, respectively connected to the rectification circuit and the motor load. The control module is configured to, when the motor load is in a shutdown state, obtain a first input voltage provided by the power supply, analyze the third harmonic of the first input voltage to obtain a first characteristic value; when the motor load is in an operating state, obtain a second input voltage provided by the power supply, analyze the third harmonic of the second input voltage to obtain a second characteristic value; calculate the change information of the second characteristic value relative to the first characteristic value, determine the operating power range of the motor load according to the change interval to which the change information belongs; and control the operation of the motor load according to the operating power range of the motor load.

[0009] In this embodiment, the air conditioner includes a rectifier circuit, a motor load, and a control module. The rectifier circuit is used to connect to a power supply and rectify the AC voltage provided by the power supply to obtain a DC voltage. The motor load operates based on this DC voltage. When the rectifier circuit rectifies the AC voltage, it will introduce third harmonic current. When the motor load is in the stopped state, the control module obtains the first input voltage provided by the power supply, analyzes the third harmonic of the first input voltage, and obtains a first eigenvalue. When the motor load is in the running state, the control module obtains the second input voltage provided by the power supply, analyzes the third harmonic of the second input voltage, and obtains a second eigenvalue. Since the first eigenvalue can reflect the third harmonic characteristics of the input voltage provided by the power supply when the motor load is in the stopped state, and the second eigenvalue can reflect the third harmonic characteristics of the input voltage provided by the power supply when the motor load is in the running state, the control module calculates the change information of the second eigenvalue relative to the first eigenvalue, determines the operating power range of the compressor according to the change interval to which the change information belongs, and controls the operation of the motor load according to this operating power range. Since the change information can reflect the stability of the input voltage provided by the power supply when the load changes, it is possible to dynamically adjust the operating power range of the motor load according to the power quality of the power supply, reduce the occurrence of overvoltage phenomena, thereby reducing the phenomenon of unexpected stoppage of the air conditioner and improving the operating stability of the air conditioner.

[0010] In some embodiments, the first eigenvalue includes a first amplitude corresponding to the third harmonic of the first input voltage, and the second eigenvalue includes a second amplitude corresponding to the third harmonic of the second input voltage; and / or

[0011] The first eigenvalue includes a first ratio between the first amplitude and the fundamental amplitude corresponding to the first input voltage, and the second eigenvalue includes a second ratio between the second amplitude and the fundamental amplitude corresponding to the second input voltage.

[0012] Power supplies with different power qualities have different abilities to stabilize the output voltage, that is, the third harmonic distortion degrees of the input voltages provided to the air conditioner are different. In this embodiment, the amplitude corresponding to the third harmonic and / or the ratio between the amplitude corresponding to the third harmonic and the fundamental amplitude are used as eigenvalues, that is, the eigenvalues are based on the characteristics that can reflect the third harmonic distortion degree of the input voltage, ensuring that the obtained change information can accurately reflect the stability of the input voltage provided by the power supply when the load changes, that is, it can reflect the power quality of the power supply, ensuring the reliability of the obtained change information, and improving the reliability of the determined operating power range.

[0013] In some embodiments, the change information includes a third ratio between the second eigenvalue and the first eigenvalue, and / or, a difference between the second eigenvalue and the first eigenvalue.

[0014] In this embodiment, the third ratio can represent the percentage increase of the second eigenvalue relative to the first eigenvalue, and the difference between the second eigenvalue and the first eigenvalue can represent the increment between the second eigenvalue and the first eigenvalue. Taking the third ratio and / or the difference between the second eigenvalue and the first eigenvalue as the change information, the obtained change information has high reliability and improves the determination accuracy of the operating power range.

[0015] In some embodiments, the control module is further configured to, if the change information is greater than or equal to a first change threshold, determine that the maximum value of the operating power range of the motor load is less than the rated power of the motor load;

[0016] The control module is further configured to, if the change information is less than the first change threshold, determine that the maximum value of the operating power range of the motor load is the rated power of the motor load.

[0017] In this embodiment, when the control module determines that the change information is greater than or equal to the first change threshold, that is, when the power quality of the power supply is poor, it determines that the maximum value of the operating power range of the motor load is less than the rated power of the motor load, that is, realizes the derating operation of the motor load, which can reduce the overvoltage phenomenon of the power supply, thereby reducing the phenomenon of unexpected shutdown of the air conditioner and improving the operating reliability of the air conditioner. When it is determined that the change information is less than the first change threshold, that is, when the power quality of the power supply is good, it determines that the maximum value of the operating power range of the motor load is the corresponding operating power of the motor load, that is, the operating power of the compressor can be selected within a larger operating power range, so as to ensure the refrigeration capacity or heating capacity of the air conditioner.

[0018] In some embodiments, the control module is further configured to, if the change information is greater than or equal to the first change threshold and less than a second change threshold, determine that the maximum value of the operating power range of the motor load is a first percentage of the rated power of the motor load;

[0019] The control module is further configured to, if the change information is greater than or equal to the second change threshold and less than a third change threshold, determine that the maximum value of the operating power range of the motor load is a second percentage of the rated power of the motor load; the second percentage is less than the first percentage.

[0020] In this embodiment, when the control module determines that the change information is greater than or equal to the first change threshold and less than the second change threshold, it determines that the maximum value of the operating power range of the motor load is the first percentage of the rated power of the motor load, so that the maximum value of the operating power range of the motor load matches the power quality level of the power supply. Based on the power quality level of the power supply, the maximum value of the operating power range of the motor load is determined in a graded manner, so that while avoiding the unexpected shutdown of the air conditioner, the operating power of the motor load can be adjusted within a larger operating power range, ensuring the cooling or heating capacity of the air conditioner.

[0021] In some embodiments, the motor load includes a compressor, and the air conditioner further includes a fan module;

[0022] The control module is further configured to, if the change information is greater than or equal to the third change threshold, control the compressor to stop operating and control the fan module to operate.

[0023] In this embodiment, if the change information is greater than or equal to the third change threshold, it means that when the compressor is in the operating state, the degree of third-harmonic distortion of the input voltage provided by the power supply is very large. To avoid power supply instability or abnormal operation of the air conditioner, the compressor is actively controlled to stop operating to reduce the degree of third-harmonic distortion in the input voltage. At the same time, since the operating power of the fan module of the air conditioner is small, maintaining the operation of the fan module will not significantly increase the degree of third-harmonic distortion, and at the same time, the operating reliability of the air conditioner can be improved.

[0024] In some embodiments, the control module is further configured to, when the power type of the power supply is a generator, determine the operating power range of the motor load according to the change interval to which the change information belongs.

[0025] The power quality of the power grid is good, while the power quality of the generator is poor. The power grid is significantly superior to the generator in terms of voltage regulation speed and load adaptability. In this embodiment, the control module determines the operating power range of the motor load only when the power type of the power supply is a generator, and controls the operating power of the motor load based on this operating power range, avoiding determining the operating power range of the motor load when using a power grid with good power quality, improving the adjustment accuracy of the operating power of the motor load and reducing the processing volume of the control module.

[0026] In some embodiments, the air conditioner further includes an inductor, and the inductor is respectively connected to the rectifier circuit and the motor load;

[0027] The inductor is used to increase the conduction angle of the rectifier circuit;

[0028] The motor load is also used to operate based on the voltage signal and current signal output by the inductor;

[0029] The control module is further configured to determine that the power supply type of the power supply is a generator when the second eigenvalue is greater than or equal to the first feature threshold and the change information is greater than or equal to the first change threshold.

[0030] The first inductor and the rectifier circuit form a passive PFC circuit, which improves the power factor but introduces third harmonic current. Since the power quality of the generator is relatively poor compared to that of the power grid, in this embodiment, when the second eigenvalue is greater than or equal to the first feature threshold and the change information is greater than or equal to the first change threshold, it is determined that the power supply type of the power supply is a generator, that is, the power supply with relatively poor dynamic response ability is identified as a generator, improving the accuracy of power supply type identification.

[0031] In some embodiments, the air conditioner further includes a current shaping module, and the current shaping module is respectively connected to the rectifier circuit, the motor load, and the control module;

[0032] The control module is further configured to control the on / off state of the current shaping module according to the input voltage and input current provided by the power supply, so as to adjust the input current provided by the power supply through the current shaping module;

[0033] The motor load is also used to operate based on the voltage signal and current signal output by the current shaping module;

[0034] The control module is further configured to analyze the second harmonic of the second input voltage to obtain a third eigenvalue; and when the second eigenvalue is greater than or equal to the first feature threshold, or the third eigenvalue is greater than or equal to the second feature threshold, if the change information is greater than or equal to the first change threshold, it is determined that the power supply type of the power supply is a generator.

[0035] The air conditioner includes a current shaping module, and the control module can control the on / off state of the current shaping module. Due to reasons such as time delay in the control of the current shaping module by the control module, the amplitude of the second harmonic current generated by the air conditioner is relatively high. In this embodiment, the control module analyzes the second harmonic of the second input voltage to obtain a second eigenvalue that can reflect the amplitude of the second harmonic of the second input voltage. Since the power quality of the generator is relatively poor compared to the power grid, when the second eigenvalue is greater than or equal to the first feature threshold, or the third eigenvalue is greater than or equal to the second feature threshold, if the change information is greater than or equal to the first change threshold, it is determined that the power supply type of the power supply is a generator, which can ensure accurate identification of the situation where power is supplied by a generator.

[0036] In some embodiments, the control module is further configured to control the motor load to operate at a first frequency, and obtain a second input voltage provided by the power supply when the motor load operates at the first frequency, wherein when the motor load operates at the first frequency, the input current of the motor load is greater than a target current.

[0037] In this embodiment, the control module controls the motor load to operate at a first frequency and obtains the second input voltage provided by the power supply when the motor load operates at the first frequency. That is, the control module obtains the second input voltage when the input current of the motor load is greater than the target current. In this case, the input current provided by the power supply is greater than the target current, so that when the power quality of the power supply is poor, larger change information can be obtained, thereby improving the accuracy of determining the operating power range of the motor load and improving the accuracy of the operating power regulation of the motor load. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0039] Figure 1 is one of the schematic structural diagrams of an air conditioner disclosed in an embodiment of the present application;

[0040] Figure 2 is another schematic structural diagram of an air conditioner disclosed in an embodiment of the present application;

[0041] Figure 3 is yet another schematic structural diagram of an air conditioner disclosed in an embodiment of the present application;

[0042] Figure 4 is the schematic module structure diagram of a control module disclosed in an embodiment of the present application;

[0043] Figure 5 is yet another schematic structural diagram of an air conditioner disclosed in an embodiment of the present application;

[0044] Figure 6 is yet another schematic structural diagram of an air conditioner disclosed in an embodiment of the present application;

[0045] Figure 7 is yet another schematic structural diagram of an air conditioner disclosed in an embodiment of the present application;

[0046] Figure 8aIt is a schematic waveform diagram of the input voltage and input current provided by a generator when the motor load is in a shutdown state, which is disclosed in an embodiment of the present application;

[0047] Figure 8b It is a schematic waveform diagram of the input voltage and input current provided by a generator when the motor load is in an operating state, which is disclosed in an embodiment of the present application;

[0048] Figure 9a It is a schematic waveform diagram of the input voltage and input current provided by the power grid when the motor load is in a shutdown state, which is disclosed in an embodiment of the present application;

[0049] Figure 9b It is a schematic waveform diagram of the input voltage and input current provided by the power grid when the motor load is in an operating state, which is disclosed in an embodiment of the present application.

[0050] Figure 10a It is a schematic diagram of the harmonic proportion of the input voltage when the power grid supplies power, which is disclosed in an embodiment of the present application;

[0051] Figure 10b It is a schematic diagram of the harmonic proportion of the input voltage when the generator supplies power, which is disclosed in an embodiment of the present application;

[0052] Figure 11 It is the seventh schematic diagram of the structure of an air conditioner, which is disclosed in an embodiment of the present application;

[0053] Figure 12 It is a schematic diagram of a current shaping module, which is disclosed in an embodiment of the present application;

[0054] Figure 13 It is the eighth schematic diagram of the structure of an air conditioner, which is disclosed in an embodiment of the present application;

[0055] Figure 14a It is another schematic waveform diagram of the input voltage and input current provided by a generator when the motor load is in a shutdown state, which is disclosed in an embodiment of the present application;

[0056] Figure 14b It is another schematic waveform diagram of the input voltage and input current provided by a generator when the motor load is in an operating state, which is disclosed in an embodiment of the present application;

[0057] Figure 15a It is another schematic waveform diagram of the input voltage and input current provided by the power grid when the motor load is in a shutdown state, which is disclosed in an embodiment of the present application;

[0058] Figure 15b It is another schematic waveform diagram of the input voltage and input current provided by the power grid when the motor load is in an operating state, which is disclosed in an embodiment of the present application;

[0059] Figure 16a It is a schematic diagram of the harmonic ratio of the input voltage when the power grid supplies power, which is disclosed in the embodiments of the present application;

[0060] Figure 16b It is a schematic diagram of the harmonic ratio of the input voltage when the generator supplies power, which is disclosed in the embodiments of the present application;

[0061] Figure 17 It is a schematic flow chart of an air conditioner control method disclosed in the embodiments of the present application;

[0062] Figure 18 It is a schematic flow chart of another air conditioner control method disclosed in the embodiments of the present application;

[0063] Figure 19 It is a schematic flow chart of yet another air conditioner control method disclosed in the embodiments of the present application. Detailed implementation manners

[0064] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0065] It should be noted that the terms "including" and "having" in the embodiments of the present application and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products, or devices.

[0066] Please refer to Figure 1 , which shows one of the schematic structural diagrams of an air conditioner provided by the embodiments of the present application. The air conditioner 110 may include a rectifier circuit 111 and a motor load 112. Among them, the motor load 112 is connected to the rectifier circuit 111. The rectifier circuit 111 is used to be connected to the power supply 120 to obtain the AC voltage provided by the power supply 120, and rectify the AC voltage provided by the power supply 120 to obtain a DC voltage. The motor load 112 can be used to operate based on this DC voltage.

[0067] It should be noted that the air conditioner 110 is provided with a DC power supply module, such as sensors, display screens, etc. The operating voltage of such a DC power supply module is DC voltage. The input voltage provided by the power supply of the air conditioner 110 is usually AC voltage. By setting a rectifier circuit 111 in the air conditioner 110, the AC voltage provided by the power supply 120 is rectified into DC voltage to enable the normal operation of multiple DC power supply modules. However, due to the non-linear characteristics of the rectifier circuit 111, that is, the response of the rectifier circuit 111 to the AC voltage is not a linear relationship. When the AC voltage is rectified by the rectifier circuit 111, a third harmonic current will be generated, and the greater the amplitude of the input current of the rectifier circuit 111, the greater the amplitude of the generated third harmonic current. This third harmonic current will increase the third harmonic distortion degree of the input voltage provided by the power supply. Among them, the third harmonic current can refer to the current component with a frequency three times that of the fundamental wave. Among them, the fundamental wave refers to the main frequency component in the input voltage. Exemplarily, if the AC voltage provided by the power supply is a sine wave of 50 Hz (hertz), then the third harmonic current is a current signal with a frequency of 150 Hz.

[0068] Optionally, the rectifier circuit 111 may include, but is not limited to, a half-wave rectifier circuit, a full-wave rectifier circuit, and a bridge rectifier circuit.

[0069] Please refer to Figure 2 , which shows a second schematic structural diagram of an air conditioner provided by an embodiment of the present application. The rectifier circuit 210 may include a rectifier bridge and a capacitor C. The rectifier bridge is respectively connected to the motor load and the power supply 220, and the capacitor C0 is connected in parallel with the motor load. The rectifier bridge is used to rectify the AC voltage provided by the power supply 120 into DC voltage, and the capacitor C0 is used to filter the DC voltage.

[0070] In some embodiments, please continue to refer to Figure 2 , the rectifier bridge may include a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. Specifically, the negative electrode of the first diode D1 is respectively connected to the positive electrode of the second diode D2 and the power supply 220, the negative electrode of the second diode D2 is respectively connected to the negative electrode of the third diode D3 and the motor load, the positive electrode of the third diode D3 is respectively connected to the negative electrode of the fourth diode D4 and the power supply 220, and the positive electrode of the fourth diode D4 is respectively connected to the positive electrode of the first diode D1 and the motor load.

[0071] It should be noted that during the positive half-cycle of the AC voltage, a forward voltage is applied to the second diode D2 and the fourth diode D4. The second diode D2 and the fourth diode D4 conduct, and a reverse voltage is applied to the first diode D1 and the third diode D3. The first diode D1 and the third diode D3 are cut off, and a half-wave rectified voltage with positive on the top and negative on the bottom is formed across the motor load. During the negative half-cycle of the AC voltage, a forward voltage is applied to the first diode D1 and the third diode D3. The first diode D1 and the third diode D3 conduct, and a reverse voltage is applied to the second diode D2 and the fourth diode D4. The second diode D2 and the fourth diode D4 are cut off, and a rectified voltage of the other half-wave with positive on the top and negative on the bottom is formed across the motor load.

[0072] In some embodiments, with continued reference to Figure 2 , the motor load may include a compressor 230, and the air conditioner further includes an inverter 240. The inverter 240 can be respectively connected to the compressor 230 and the rectifier circuit 210. The inverter 240 is configured to invert the DC voltage output by the rectifier circuit 210 to obtain an AC voltage and supply it to the compressor 230 to drive the compressor 230 to operate. Exemplarily, the air conditioner may further include a condenser and an evaporator. The compressor, the condenser, and the evaporator form a refrigerant circulation loop, and this refrigerant circulation loop is used to circulate the refrigerant in the refrigerant circulation loop, thereby realizing the refrigeration function or the heating function of the air conditioner.

[0073] It should be noted that the compressor is one of the main power-consuming components in the air conditioner. Compared with the compressor being in a stopped state, when the compressor is in an operating state, the current flowing through the rectifier circuit is larger, and the generated third-harmonic current is larger. Among them, the stopped state may refer to the compressor being in a standby or off state, and the air conditioner has no refrigeration or heating behavior. The operating state may refer to the compressor having been started, and the air conditioner has a refrigeration output or a heating output.

[0074] The R & D personnel of the present application found that during the process of supplying power to the air conditioner through the power supply, there would be a phenomenon that the air conditioner stopped operating. The R & D personnel of the present application studied and analyzed the air conditioner and the power supply and found that during the process of the power supply supplying power to the air conditioner, the third-harmonic current generated on the air conditioner side caused the output voltage of the power supply (that is, the input voltage provided by the generator to the air conditioner) to have third-harmonic distortion, resulting in an excessive output voltage of the power supply, that is, the power supply had an overvoltage phenomenon (a phenomenon that the output voltage of the generator exceeded the safe range of the rated voltage), triggering the overvoltage protection mechanism of the power supply, the power supply stopped working, and the air conditioner stopped operating. For the air conditioner, there was an unexpected stop operation phenomenon, and the operation reliability of the air conditioner was low.

[0075] The embodiment of the present application provides an air conditioner, which can reduce the phenomenon of unexpected shutdown of the air conditioner and improve the operation reliability of the air conditioner.

[0076] Please refer to Figure 3 , which shows the third schematic structural diagram of an air conditioner provided by the embodiment of the present application. As Figure 3 shown, the air conditioner 310 may include a rectification circuit 311, a motor load 312, and a control module 313. Among them, the control module 313 is connected to the rectification circuit 311, and the motor load 312 is connected to the rectification circuit 311. The rectification circuit 311 is used to be connected to the power supply 320, and the rectification circuit 311 is used to rectify the AC voltage provided by the power supply 320 to obtain a DC voltage, and the motor load 312 is used to operate based on the DC voltage. The control module 313 is used to obtain the first input voltage provided by the power supply 320, analyze the third harmonic of the first input voltage to obtain a first characteristic value when the motor load 312 is in a shutdown state, and obtain the second input voltage provided by the power supply 320, analyze the third harmonic of the second input voltage to obtain a second characteristic value when the motor load 312 is in an operating state, calculate the change information of the second characteristic value relative to the first characteristic value, determine the operating power range of the motor load 312 according to the change interval to which the change information belongs, and the control module 313 is further used to control the operation of the motor load 312 according to the operating power range of the motor load 312.

[0077] It should be noted that the power supply 320 may refer to a power supply device or a power system that provides electrical energy for the air conditioner 310, and the motor load 312 may refer to a load including a motor in the air conditioner 310, or an equipment main body composed of a motor and an object driven by the motor, such as a compressor. The operating power range of the compressor may refer to the range of operating power allowed for the compressor during operation when the air conditioner is powered by the power supply. The rectification circuit 311 is connected to the power supply 320 to receive the first input voltage and the second input voltage provided by the power supply 320. The control module 313 is connected to the rectification circuit 311 and can collect the first input voltage and the second input voltage provided by the power supply 320. The first characteristic value can be used to describe the characteristics of the third harmonic of the first input voltage, the second characteristic value can be used to describe the characteristics of the third harmonic of the second input voltage, and the change information can be used to characterize the change amplitude of the second characteristic value relative to the first characteristic value.

[0078] Exemplarily, the control module 313 is further configured to determine the maximum value of the operating power range according to the change interval to which the change information belongs. The operating power range of the motor load may be less than or equal to the determined maximum value, or may be less than or equal to the maximum value and greater than or equal to the starting power corresponding to the motor load. Wherein, the starting power corresponding to the motor load may refer to the minimum input power required to maintain the continuous and stable operation of the motor load. If the operating power supplied to the motor load is less than this minimum value, it may cause the compressor to fail to start.

[0079] Exemplarily, the control module 313 is further configured to control the motor load 312 to operate at an operating power less than or equal to the maximum value of the operating power range of the motor load 312.

[0080] Exemplarily, the change information may include a change value, which is positively correlated with the change amplitude of the second characteristic value relative to the first characteristic value, that is, the greater the change value, the greater the gap between the second characteristic value and the first characteristic value.

[0081] It should be noted that the dynamic response capabilities of power supplys with different power qualities are different. The better the power quality of the power supply, the stronger the ability to maintain the stability of the output voltage of the power supply. That is, when the load changes and a non-linear load disturbance is introduced, the output voltage of the power supply is less affected by this non-linear load disturbance. Since the air conditioner equipped with a rectifier circuit will generate third harmonic current, and the generated third harmonic current is greater when the motor load of the air conditioner is in the operating state. By comparing the introduction of different third harmonic currents, the change in the third harmonic distortion degree of the input voltage provided by the power supply is determined, and based on this change, the operating power range of the motor load is determined, so as to dynamically adjust the operating power range of the motor load according to the power quality of the power supply, reduce the occurrence of overvoltage of the power supply, thereby reducing the phenomenon of unexpected shutdown of the air conditioner and improving the operating stability of the air conditioner.

[0082] Exemplarily, multiple change intervals may be preset in advance, each change interval corresponding to a different power quality level. According to the change interval to which the change information belongs, the operating power range of the motor load 312 is determined, so that the operating power of the motor load matches the power quality level of the power supply, reducing the occurrence of overvoltage of the power supply, thereby reducing the phenomenon of unexpected shutdown of the air conditioner and improving the operating stability of the air conditioner.

[0083] The first eigenvalue is obtained by analyzing the third harmonic of the first input voltage, and the second eigenvalue is obtained by analyzing the third harmonic of the second input voltage. The first eigenvalue can reflect the characteristics of the third harmonic of the input voltage provided by the power supply 320 when the motor load 312 is in the stopped state, and the second eigenvalue can reflect the characteristics of the third harmonic of the input voltage provided by the power supply 320 when the motor load 312 is in the running state. In this embodiment, the wearable device calculates the change information of the second eigenvalue relative to the second eigenvalue, and determines the operating power range of the motor load 312 according to the change interval to which the change information belongs. This change information can accurately reflect the dynamic response ability of the power supply 320, that is, the ability of the power supply to maintain the stability of the output voltage of the power supply 320 when the load changes. Therefore, based on the change interval to which the change information belongs, determining the operating power range of the motor load 312 and controlling the motor load 312 to operate at an operating power less than or equal to the maximum value of the operating power range can effectively reduce the occurrence of overvoltage of the power supply, thereby reducing the occurrence of unexpected stoppage of the air conditioner and improving the operating stability of the air conditioner.

[0084] In some embodiments, the duration corresponding to the first input voltage is greater than or equal to the first target duration, and the duration corresponding to the second input voltage is greater than or equal to the second target duration. It should be noted that the first target duration and the second target duration can be set as needed. Collecting the first input voltage with a duration greater than or equal to the first target duration and the second input voltage with a duration greater than or equal to the second target duration can ensure the stability and reliability of the first eigenvalue and the second eigenvalue determined by the control module, thereby improving the accuracy of power supply type identification.

[0085] Optionally, the value range of the first target duration includes 3 seconds to 6 seconds. Optionally, the first target duration is 3 seconds, 4 seconds, 5 seconds or 6 seconds.

[0086] Optionally, the value range of the second target duration includes 3 seconds to 6 seconds. Optionally, the second target duration is 3 seconds, 4 seconds, 5 seconds or 6 seconds.

[0087] It can be understood that the second target duration and the first target duration can be equal or unequal, and this embodiment does not limit this.

[0088] Exemplarily, the control module 313 can be used to obtain the first input voltage provided by the power supply 320 when the air conditioner 310 is started and the motor load 312 is in the stopped state.

[0089] In some embodiments, the control module 313 is connected to the motor load 312, and the control module 313 is further configured to control the motor load 312 to be in an operating state or a shutdown state. It should be noted that the control module 313 controls the motor load 312 to be in an operating state or a shutdown state, that is, controls the motor load 312 to run or shut down.

[0090] In some embodiments, the control module 313 is further configured to control the motor load 312 to enter an operating state when a first input voltage is obtained. It should be noted that when the motor load 312 is in a shutdown state, the control module 313 obtains the first input voltage provided by the power supply 320, and after obtaining the first input voltage, controls the motor load 312 to enter an operating state, and then obtains a second input voltage, so as to avoid the duration of the motor load 312 being in a shutdown state being too short to obtain the first input voltage.

[0091] As Figure 4 shown, it shows a schematic diagram of the module structure of a control module provided by an embodiment of the present application. As Figure 4 shown, the control module 410 may include a voltage detection unit 411 and a controller 412. Among them, the voltage detection unit 411 may be respectively connected to the controller 412 and the rectifier circuit 413. The voltage detection unit 411 is configured to sample the first input voltage provided by the power supply 415 to obtain multiple groups of first voltage data corresponding to the first input voltage when the motor load 414 is in a shutdown state, and sample the second input voltage provided by the power supply 415 to obtain multiple groups of second voltage data corresponding to the second input voltage when the motor load 414 is in an operating state. The controller 412 is configured to perform Fourier transform processing on multiple groups of first voltage data respectively to obtain first sub-eigenvalues corresponding to the multiple groups of first voltage data, and calculate the average value of the multiple first sub-eigenvalues to obtain a first eigenvalue. The controller 412 is further configured to perform Fourier transform processing on multiple groups of second voltage data respectively to obtain second sub-eigenvalues corresponding to the multiple groups of second voltage data, and calculate the average value of the multiple second sub-eigenvalues to obtain a second eigenvalue.

[0092] It can be understood that each group of first voltage data includes multiple discrete values, and each group of second voltage data includes multiple discrete values. It should be noted that the first eigenvalue is the average value of multiple first sub-eigenvalues, and the second eigenvalue is the average value of multiple second sub-eigenvalues. The first input voltage includes multiple first periodic signals, such as multiple sine signals, and the same group of first voltage data is obtained by sampling the same first periodic signal. It can be understood that if the frequency of the first input voltage is 50 Hz, the duration corresponding to each first periodic signal is 0.02 s. The second input voltage may include multiple second periodic signals, and the same group of second voltage data corresponds to the same second periodic signal, and the same group of second voltage data is obtained by sampling the same second periodic signal.

[0093] In this embodiment, the controller 412 performs Fourier transform processing on each group of first voltage data respectively to obtain the first sub-eigenvalues corresponding to each group of first voltage data. Selecting to perform Fourier transform processing on each group of first voltage data can avoid spectral leakage and ensure the accuracy of the obtained first sub-eigenvalues. Calculating the average value of multiple first sub-eigenvalues to obtain the first eigenvalue can effectively filter out instantaneous perturbations within the period and improve the stability and reliability of the determined first eigenvalue. Similarly, the controller 412 performs Fourier transform processing on each group of second voltage data respectively to obtain the second sub-eigenvalues corresponding to each group of second voltage data. Selecting to perform Fourier transform processing on each group of second voltage data can avoid spectral leakage and ensure the accuracy of the obtained second sub-eigenvalues. Calculating the average value of multiple second sub-eigenvalues to obtain the second eigenvalue can effectively filter out instantaneous perturbations within the period and improve the stability and reliability of the determined second eigenvalue.

[0094] Optionally, the first sub-eigenvalue corresponding to the first periodic signal may include a first sub-amplitude, and the second sub-eigenvalue corresponding to the second periodic signal may include a second sub-amplitude, where the first sub-amplitude is the amplitude corresponding to the third harmonic of the first periodic signal, and the second sub-amplitude is the amplitude corresponding to the third harmonic of the second periodic signal.

[0095] Optionally, the first sub-eigenvalue corresponding to the first periodic signal may include a first sub-ratio, and the second sub-eigenvalue corresponding to the second periodic signal may include a second sub-ratio, where the first sub-ratio is the ratio between the first sub-amplitude and the fundamental amplitude of the first periodic signal, and the second sub-ratio is the ratio between the second sub-amplitude and the fundamental amplitude of the second periodic signal.

[0096] Among them, the fundamental amplitude may refer to the voltage amplitude corresponding to the fundamental wave, and the fundamental wave is the most main frequency component in the first input voltage. Exemplarily, the first sub-ratio may be the value obtained by dividing the first sub-amplitude by the fundamental amplitude of the first periodic signal, and the second sub-ratio may be the value obtained by dividing the second sub-amplitude by the fundamental amplitude of the second periodic signal.

[0097] Optionally, the Fourier transform processing may include FFT (Fast Fourier Transform), and the FFT can convert a complex time-domain signal into a frequency-domain spectrum to accurately locate the fundamental wave and harmonic components.

[0098] Optionally, the controller may include an MCU (Microcontroller Unit).

[0099] In some embodiments, the voltage detection unit 411 may include a first resistor and a second resistor connected in series. The first resistor and the second resistor connected in series can be used to perform voltage division sampling on the input voltage (such as the first input voltage and the second input voltage) provided by the power supply 415 to ensure that the input voltage is within the processing range of the controller 412, realizing the safe acquisition and isolation of the input voltage.

[0100] In other embodiments, the voltage detection unit 411 may include a voltage sensor to detect the input voltage through the voltage sensor to obtain multiple sets of first voltage data and multiple sets of second voltage data.

[0101] In this embodiment, the air conditioner includes a rectifier circuit, a motor load, and a control module. The rectifier circuit is used to connect to the power supply and rectify the AC voltage provided by the power supply to obtain a DC voltage. The motor load operates based on this DC voltage. The rectification of the AC voltage by the rectifier circuit will introduce a third harmonic current. When the motor load is in the stopped state, the control module obtains the first input voltage provided by the power supply, analyzes the third harmonic of the first input voltage to obtain a first eigenvalue, and when the motor load is in the running state, the control module obtains the second input voltage provided by the power supply, analyzes the third harmonic of the second input voltage to obtain a second eigenvalue. Since the first eigenvalue can reflect the third harmonic characteristics of the input voltage provided by the power supply when the motor load is in the stopped state, and the second eigenvalue can reflect the third harmonic characteristics of the input voltage provided by the power supply when the motor load is in the running state, the control module calculates the change information of the second eigenvalue relative to the first eigenvalue, determines the operating power range of the compressor according to the change interval to which the change information belongs, and controls the operation of the motor load according to the operating power range. Since the change information can reflect the stability of the input voltage provided by the power supply when the load changes, it realizes dynamically adjusting the operating power range of the motor load according to the power quality of the power supply, reducing the occurrence of overvoltage phenomena, thereby reducing the phenomenon of unexpected stoppage of the air conditioner and improving the operating stability of the air conditioner.

[0102] In some embodiments, the first eigenvalue may include a first amplitude, and the second eigenvalue may include a second amplitude, where the first amplitude refers to the amplitude corresponding to the third harmonic of the first input voltage, and the second amplitude refers to the amplitude corresponding to the third harmonic of the second input voltage.

[0103] It should be noted that the amplitude corresponding to the third harmonic can reflect the magnitude of the third harmonic, that is, it can characterize the degree of third harmonic distortion of the input voltage. In this embodiment, by calculating the change information of the amplitude corresponding to the third harmonic of the second input voltage relative to the amplitude corresponding to the third harmonic of the first input voltage, the obtained change information can reflect the change in the degree of third harmonic distortion of the power supply when the load changes. Based on this change information, the operating power range of the motor load is adjusted to reduce the occurrence of overvoltage, thereby reducing the phenomenon of unexpected shutdown of the air conditioner and improving the operating stability of the air conditioner.

[0104] In some embodiments, the first eigenvalue may include a first ratio, and the second eigenvalue may include a second ratio, where the first ratio is the ratio between the first amplitude and the fundamental wave amplitude corresponding to the first input voltage, and the second ratio is the ratio between the second amplitude and the fundamental wave amplitude corresponding to the second input voltage.

[0105] Wherein, the fundamental wave amplitude may refer to the voltage amplitude corresponding to the fundamental wave, and the fundamental wave is the main frequency component in the first input voltage. The ratio between the amplitude corresponding to the third harmonic and the fundamental wave amplitude can reflect the relative amplitude ratio of the third harmonic, that is, it can characterize the degree of third harmonic distortion of the input voltage. In this embodiment, the change information of the second ratio relative to the first ratio is calculated, and based on this change information, the operating power range of the motor load is adjusted to reduce the occurrence of overvoltage, thereby reducing the phenomenon of unexpected shutdown of the air conditioner and improving the operating stability of the air conditioner.

[0106] Exemplarily, the first ratio may be the first amplitude divided by the fundamental wave amplitude corresponding to the first input voltage, and the second ratio may be the second amplitude divided by the fundamental wave amplitude corresponding to the second input voltage.

[0107] Power supplies with different power qualities have different abilities to stabilize the output voltage, that is, the degrees of third harmonic distortion of the input voltage provided to the air conditioner are different. In this embodiment, the amplitude corresponding to the third harmonic, and / or the ratio between the amplitude corresponding to the third harmonic and the fundamental wave amplitude are used as eigenvalues, that is, the characteristics that can reflect the degree of third harmonic distortion of the input voltage are used as eigenvalues, ensuring that the obtained change information can accurately reflect the stability degree of the input voltage provided by the power supply when the load changes, that is, it can reflect the power quality of the power supply, ensuring the reliability of the obtained change information, and improving the reliability of the determined operating power range.

[0108] In some embodiments, the variation information may include a third ratio between the second eigenvalue and the first eigenvalue, and / or, a difference between the second eigenvalue and the first eigenvalue.

[0109] It should be noted that the third ratio refers to the ratio between the second eigenvalue and the first eigenvalue, such as the second eigenvalue divided by the first eigenvalue. The difference between the second eigenvalue and the first eigenvalue may refer to the second eigenvalue minus the first eigenvalue. The difference between the second eigenvalue and the first eigenvalue may also be the absolute value of the difference between the second eigenvalue and the first eigenvalue. The ratio can represent the percentage increase between two numerical values, and the difference can represent the increment between two numerical values. Both the third ratio and the difference between the second eigenvalue and the first eigenvalue can accurately represent the change of the second eigenvalue relative to the first eigenvalue.

[0110] Exemplarily, the control module is further configured to calculate the ratio between the second eigenvalue and the first eigenvalue after obtaining the second eigenvalue and the first eigenvalue, so as to obtain a third ratio, and / or, calculate the difference between the second eigenvalue and the first eigenvalue.

[0111] In some embodiments, the control module is further configured to determine that the maximum value of the operating power range of the motor load is less than the rated power of the motor load if the variation information is greater than or equal to a first variation threshold. The control module is further configured to determine that the maximum value of the operating power range of the motor load is the maximum power corresponding to the motor load if the variation information is less than the first variation threshold.

[0112] It should be noted that the rated power of the motor load refers to the maximum input power allowed for the motor load during long-term continuous operation under rated working conditions. The maximum power corresponding to the motor load refers to the maximum input power that the motor load can withstand in a short period of time. The maximum power corresponding to the motor load is usually greater than the rated power of the motor load. The first variation threshold can be used to measure whether the second eigenvalue changes significantly relative to the first eigenvalue. If the change is significant, it can be considered that the power quality of the power supply is poor. If the change is small, it can be considered that the power quality of the power supply is good. Exemplarily, the first variation threshold can be preset and obtained through experimental tests. For example, when the air conditioner is powered by a power supply with good power quality and a power supply with poor power quality respectively, the corresponding variation information when powered by the power supply with good power quality and the corresponding variation information when powered by the power supply with poor power quality are obtained. The first variation threshold is determined based on these two variation information. That is, the first variation threshold can be used to distinguish the corresponding variation information when powered by a power supply with good power quality and the corresponding variation information when powered by a power supply with poor power quality. Thus, based on the comparison result between the first variation threshold and the variation information, it is determined whether the motor load operates at full power or needs to derate.

[0113] It can be understood that the power quality of the generator is poor, while that of the power grid is good. Therefore, the generator and the power grid can be used to supply power to the air conditioner respectively to obtain corresponding change information, and then determine the first change threshold. The generator mentioned in the embodiments of this application may refer to a private generator, such as a gasoline generator, a diesel generator, and a household photovoltaic system, etc., and the power grid may refer to the national power grid.

[0114] Exemplarily, the generator may include an AVR (Automatic Voltage Regulator). The AVR is used to detect the output voltage of the generator in real time, that is, to detect the input voltage provided by the generator in real time, and automatically adjust the magnitude of the excitation current of the rotor of the generator according to the change of the input voltage, so as to control the magnetic field strength and stabilize the output voltage of the generator. However, the response speed of the AVR of the generator is limited and the adjustment amplitude is slow. When the rectifier circuit 311 generates triple harmonic current, the generator is not in time to quickly stabilize the output voltage it provides, resulting in a large amplitude of the triple harmonic voltage of the input voltage provided by the generator, that is, the power quality of the generator is poor.

[0115] It should be noted that GB / T 14549-2025 "Power Quality - Harmonics in Public Power Grids" stipulates that for a low-voltage power grid (380V), the total harmonic distortion (THD) ≤ 5%, and the triple harmonic voltage distortion rate ≤ 4%. According to IEC 61000-3-2:2024, when equipment is connected to the power grid, the triple harmonic current needs to meet: I_3 ≤ 1.5% * I0 (for type A equipment), where I_3 is the amplitude of the triple harmonic current and I0 is the amplitude of the rated input current. Type A equipment includes air conditioners. According to the regulations of GB / T14549-2025 and IEC 61000-3-2:2024, it can be seen that the power grid has a strong adjustment ability in power quality management, especially in harmonic control. When the rectifier circuit 311 generates triple harmonic current, it will not cause a drastic triple harmonic distortion of the input voltage provided by the power grid, that is, the power quality of the power grid is good.

[0116] Exemplarily, the response time of the AVR is typically from 30 ms (milliseconds) to 100 ms. A 2.5 - ms mutation occurs in the waveform of the input current of the air conditioner 310, but the AVR cannot respond quickly within 2.5 ms, resulting in a large distortion of the input voltage provided by the generator, that is, the energy of the third - harmonic in the input voltage provided by the generator is large. With a large grid capacity and fast voltage - regulation ability, even if a 2.5 - ms mutation occurs in the waveform of the input current of the air conditioner 310, it will not cause a severe third - harmonic distortion in the input voltage provided by the grid. Determining the first change threshold based on the change information corresponding to generator power supply and the change information corresponding to grid power supply can ensure the reliability of the first change threshold, thereby providing the reliability of power adjustment.

[0117] In some embodiments, the first eigenvalue includes a first ratio, the second eigenvalue includes a second ratio. Wherein, the first ratio may include the value obtained by dividing the first amplitude by the fundamental - wave amplitude corresponding to the first input voltage, the second ratio may include the value obtained by dividing the second amplitude by the fundamental - wave amplitude corresponding to the second input voltage, the third ratio may include the value obtained by dividing the second ratio by the first ratio, and the first change threshold may include a first preset ratio. The control module is used to compare the third ratio with the first preset ratio. If the third ratio is greater than or equal to the first preset ratio, it is determined that the maximum value of the operating - power range of the motor load is less than the rated power of the motor load. If the third ratio is less than the first preset ratio, it is determined that the maximum value of the operating - power range of the motor load is the maximum power corresponding to the motor load.

[0118] It should be noted that the control module can preset the first preset ratio and determine the maximum value of the operating - power range of the motor load according to the comparison result between the third ratio and the first preset ratio.

[0119] In some embodiments, the first eigenvalue includes a first ratio, the second eigenvalue includes a second ratio, the change information includes a characteristic difference, and the first change threshold includes an adjustable threshold. Wherein, the adjustable threshold is the product of the first ratio and a preset coefficient, and the characteristic difference is the value obtained by subtracting the first eigenvalue from the second eigenvalue. The control module is also used to compare the characteristic difference with the adjustable threshold. If the characteristic difference is greater than or equal to the adjustable threshold, it is determined that the maximum value of the operating - power range of the motor load is less than the rated power of the motor load. If the characteristic difference is less than the first preset ratio, it is determined that the maximum value of the operating - power range of the motor load is the maximum power corresponding to the motor load.

[0120] It should be noted that the control module can preset the preset coefficient, determine the adjustable threshold according to the preset coefficient and the first ratio, and determine the maximum value of the operating - power range of the motor load according to the comparison result between the characteristic difference and the adjustable threshold.

[0121] In some embodiments, the control module is further configured to, if the change information is greater than or equal to the first change threshold and less than the second change threshold, determine that the maximum value of the operating power range of the motor load is the first percentage of the rated power of the motor load. The control module is further configured to, if the change information is greater than or equal to the second change threshold and less than the third change threshold, determine that the maximum value of the operating power range of the motor load is the second percentage of the rated power of the motor load. Wherein, the second percentage is less than the first percentage.

[0122] It should be noted that the second change threshold is greater than the first change threshold and less than the third change threshold. It can be understood that the greater the change information, the worse the power quality of the power supply, that is, the lower the power quality level. Under the same load, the greater the degree of third-harmonic distortion provided by the power supply, the smaller the maximum value of the operating power range of the motor load needs to be to avoid overvoltage of the power supply, thereby avoiding the phenomenon of unexpected shutdown of the motor load.

[0123] Exemplarily, the motor load may include a compressor, which is one of the main power-consuming components in an air conditioner. Dynamically adjusting the maximum value of the operating power range of the compressor according to the change interval to which the change information belongs can effectively control the absorption power of the air conditioner and better reduce the phenomenon of unexpected shutdown of the power supply.

[0124] It should be noted that the power quality of the power supply can be divided into multiple power quality levels. For example, different types of generators may have quite different dynamic response capabilities. In this embodiment, by setting the first change threshold, the second change threshold, and the third change threshold, the change interval to which the change information belongs is determined, so as to realize the hierarchical adjustment of the maximum value of the operating power range of the motor load, so that while avoiding overvoltage of the power supply, the operating power of the motor load can also be adjusted within a larger operating power range, thereby ensuring the cooling or heating capacity of the air conditioner.

[0125] Exemplarily, the second percentage may be 50%, and the first percentage may be 70%. It can be understood that the first percentage and the second percentage can be set according to actual situations, and this embodiment does not limit this.

[0126] In some embodiments, if the change information is greater than or equal to the third change threshold, it is determined that the maximum value of the operating power range of the compressor is 0, that is, it is necessary to control the motor load to stop operating.

[0127] In this embodiment, when the control module determines that the change information is greater than or equal to the first change threshold and less than the second change threshold, it determines that the maximum value of the operating power range of the motor load is the first percentage of the rated power of the motor load, so that the maximum value of the operating power range of the motor load matches the power quality level of the power supply. Based on the power quality level of the power supply, the maximum value of the operating power range of the motor load is determined in a hierarchical manner, so that while avoiding the unexpected shutdown of the air conditioner, the operating power of the motor load can be adjusted within a larger operating power range, ensuring the cooling or heating capacity of the air conditioner.

[0128] In this embodiment, when the control module determines that the change information is greater than or equal to the first change threshold, that is, when the power quality of the power supply is poor, it determines that the maximum value of the operating power range of the motor load is less than the rated power of the motor load, that is, the motor load operates at a reduced load, which can reduce the overvoltage phenomenon of the power supply, thereby reducing the unexpected shutdown of the air conditioner and improving the operating reliability of the air conditioner. When it is determined that the change information is less than the first change threshold, that is, when the power quality of the power supply is good, it determines that the maximum value of the operating power range of the motor load is the corresponding maximum power of the motor load, that is, the operating power of the compressor can be selected within a larger operating power range, so as to ensure the cooling or heating capacity of the air conditioner.

[0129] In this embodiment, the third ratio can represent the percentage increase of the second eigenvalue relative to the first eigenvalue, and the difference between the second eigenvalue and the first eigenvalue can represent the increment between the second eigenvalue and the first eigenvalue. Using the third ratio and / or the difference between the second eigenvalue and the first eigenvalue as the change information, the reliability of the obtained change information is high, improving the determination accuracy of the operating power range.

[0130] In some embodiments, please refer to Figure 5 , the motor load may include a compressor 510, the air conditioner may further include a fan module 520, and the control module 530 is further configured to control the compressor 510 to stop operating and control the fan module 520 to operate if the change information is greater than or equal to a third change threshold.

[0131] It should be noted that if the change information is greater than or equal to the third change threshold, it means that when the compressor 510 is in the operating state, the degree of third-harmonic distortion of the input voltage provided by the power supply 540 is very large. To avoid instability of the power supply 540 or abnormal conditions of the air conditioner, the compressor 510 is actively controlled to stop operating, so as to reduce the degree of third-harmonic distortion in the input voltage and reduce the load impact, and improve the power quality of the power supply. At the same time, since the operating power of the blower module of the air conditioner is small, maintaining the operation of the blower module will not significantly increase the degree of third-harmonic distortion. At the same time, maintaining the operation of the blower module can improve the operating reliability of the air conditioner.

[0132] Exemplarily, the blower module 520 is connected to the control module 530, and the control module 530 can control the blower module 520 to be in the operating state or the shutdown state.

[0133] In some embodiments, the blower module 520 may include an indoor blower and / or an outdoor blower. Among them, the indoor blower is located on the evaporator side, and the outdoor blower is located on the condenser side. The indoor blower is used to realize heat exchange between air and the evaporator, and blow out the air after heat exchange with the evaporator to achieve cooling or heating. The outdoor blower is used to realize heat exchange between air and the condenser, prevent the temperature of the condenser from being too high, thereby avoiding too high a condensation pressure and prolonging the service life of the compressor 510.

[0134] It should be noted that if the indoor blower and / or the outdoor blower is in the operating state before it is detected that the change information is greater than or equal to the second change threshold, then the indoor blower and / or the outdoor blower is maintained.

[0135] In some embodiments, the control module 530 is further configured to control the outdoor blower to be in the shutdown state, that is, control the outdoor blower to stop operating, when the current time reaches a preset shutdown duration from the detection time when it is detected that the change information is greater than or equal to the third change threshold. It should be noted that the preset shutdown duration can be set according to the actual situation. When the change information is greater than or equal to the second change threshold, the compressor 510 stops operating. At this time, after maintaining the operation of the outdoor blower for the preset shutdown duration and then actively shutting down the outdoor blower, it can be realized that when the compressor 510 stops operating, the condenser continues to dissipate heat, avoiding too high a condensation pressure and prolonging the service life of the compressor 510. When the preset shutdown duration is reached, it can be considered that the condensation pressure is small enough. At this time, the outdoor blower can be actively shut down to save the power consumption of the air conditioner.

[0136] In this embodiment, when the change information is greater than or equal to the third change threshold, the control module 530 controls the indoor fan to run, so that when the compressor 510 stops running, the indoor fan continues to run, and can continue to blow out residual cold air or warm air to relieve the discomfort caused by the temperature difference, avoiding the user's feeling of "sudden shutdown". At the same time, since there is still a sense of wind when the indoor fan is running, the user will not mistakenly think that the air conditioner is "frozen" or "faulty", thereby improving the user experience. When the change information is greater than or equal to the third change threshold, the control module 530 controls the outdoor fan to run, so that the condenser continues to dissipate heat, avoids excessive condensation pressure, and prolongs the life of the compressor 510.

[0137] In this embodiment, if the change information is greater than or equal to the third change threshold, it means that when the compressor is in operation, the third harmonic distortion of the input voltage provided by the power supply is very large. In order to avoid instability of the power supply or abnormality of the air conditioner, the compressor is actively controlled to stop running to reduce the third harmonic distortion in the input voltage. At the same time, since the operating power of the fan module of the air conditioner is relatively small, maintaining the operation of the fan module will not significantly increase the third harmonic distortion, and at the same time, the operating reliability of the air conditioner can be improved.

[0138] In some embodiments, the control module is also used to control the motor load to operate at a first frequency, and obtain a second input voltage provided by the power supply when the motor load operates at the first frequency. When the motor load operates at the first frequency, the input current of the motor load is greater than the target current. It should be noted that the magnitude of the third harmonic current generated by the air conditioner is related to the magnitude of the input current of the air conditioner. The control module controls the motor load to operate at the first frequency so that the input current of the motor load is greater than the target current, thereby making the input current provided by the power supply greater than the target current, thereby avoiding the situation where the input current provided by the power supply is too small, resulting in a small amplitude of the third harmonic of the input voltage provided by the power supply, which occurs when the power quality of the power supply is poor and a larger second characteristic value cannot be obtained.

[0139] It is understandable that the first frequency can be determined according to the specifications and type of the motor load. In some embodiments, the first frequency is less than the target frequency. It should be noted that the first frequency should not be set too large. Since the motor load frequency increase process is carried out step by step, by setting the first frequency to be less than the target frequency, it is avoided that the time required to obtain the second input voltage is long, and the efficiency of identifying the power type is improved.

[0140] Exemplarily, the motor load may include a compressor, and the target frequency may refer to the operating frequency corresponding to the compressor when the refrigeration or heating effect of the air conditioner can be guaranteed. In this embodiment, by setting the first frequency to be less than the operating frequency corresponding to the compressor to achieve the refrigeration or heating effect, it is possible to avoid the phenomenon that after the operating frequency of the compressor rises to the first frequency and the second input voltage is obtained, the operating frequency of the compressor needs to be reduced, thereby reducing the number of adjustments of the compressor frequency and improving the stability of the operation of the air conditioner.

[0141] In this embodiment, the control module controls the motor load to operate at the first frequency and obtains the second input voltage provided by the power supply when the motor load operates at the first frequency. That is, the control module obtains the second input voltage when the input current of the motor load is greater than the target current. In this case, the input current provided by the power supply is greater than the target current, so that when the power quality of the power supply is poor, larger change information can be obtained, thereby improving the accuracy of determining the operating power range of the motor load and improving the accuracy of the operating power adjustment of the motor load.

[0142] In some embodiments, the control module is further configured to determine the operating power range of the motor load according to the change interval to which the change information belongs when the power supply type of the power supply is a generator.

[0143] It should be noted that the power quality of the power grid is good, while the power quality of the generator is poor. The power grid is significantly superior to the generator in terms of voltage regulation speed and load adaptability. In this embodiment, the control module determines the operating power range of the motor load only when the power supply type of the power supply is a generator, and controls the operating power of the motor load based on this operating power range, avoiding determining the operating power range of the motor load when using a power grid with good power quality, improving the adjustment accuracy of the operating power of the motor load and reducing the processing amount of the control module.

[0144] In some embodiments, the control module is further configured to determine the power supply type of the power supply according to the change information. It should be noted that the power supply type of the power supply may include a generator or a power grid. Compared with the power grid, the degree of third-harmonic distortion of the second input voltage provided by the generator is quite different from that of the first input voltage. The change information can reflect the change amplitude of the second eigenvalue relative to the first eigenvalue. In this embodiment, the control module can accurately distinguish between power grid power supply and generator power supply according to this change information, and the accuracy of the control module in identifying the power supply type of the power supply is relatively high.

[0145] In some embodiments, the control module is further configured to determine the type of the power supply according to the change information of the second eigenvalue relative to the first eigenvalue and the third harmonic characteristic interval to which the second eigenvalue belongs.

[0146] It should be noted that when the motor load is in the operating state, the input current provided by the power supply is large, and the third harmonic current generated by the air conditioner is large, resulting in a large difference between the amplitude of the third harmonic of the second input voltage provided by the generator itself and the amplitude of the third harmonic of the second input voltage provided by the power grid. Therefore, it is possible to determine whether the type of the power supply is a generator by determining whether the second eigenvalue is large.

[0147] Exemplarily, the third harmonic characteristic interval may include a third harmonic characteristic interval corresponding to the generator and a third harmonic characteristic interval corresponding to the power grid. The third harmonic characteristic interval corresponding to the generator is greater than the third harmonic characteristic interval corresponding to the power grid, that is, the lower limit value of the third harmonic characteristic interval corresponding to the generator is greater than the upper limit value of the third harmonic characteristic interval corresponding to the power grid. It should be noted that when the air conditioner is powered by the generator and the power grid respectively, the second eigenvalue corresponding to the generator power supply and the second eigenvalue corresponding to the power grid power supply can be obtained, so as to divide multiple third harmonic characteristic intervals. Among them, the third harmonic characteristic interval corresponding to the generator includes the second eigenvalue corresponding to the generator power supply, but does not include the second eigenvalue corresponding to the power grid power supply. The third harmonic characteristic interval corresponding to the power grid includes the second eigenvalue corresponding to the power grid power supply, but does not include the second eigenvalue corresponding to the generator power supply.

[0148] Exemplarily, the boundary value of the characteristic interval may include a first characteristic threshold. If the second eigenvalue is greater than or equal to the first characteristic threshold, it is determined that the second eigenvalue is in the third harmonic characteristic interval corresponding to the generator. If the first eigenvalue is less than the third harmonic characteristic interval, it is determined that the second eigenvalue is in the third harmonic characteristic interval corresponding to the power grid. It can be understood that the first characteristic threshold can be obtained according to experimental tests, and the first characteristic threshold can be the lower limit value of the third harmonic characteristic interval corresponding to the generator or the upper limit value of the third harmonic characteristic interval corresponding to the power grid.

[0149] In some embodiments, the control module is further configured to determine that the type of the power supply is a generator if the change information is greater than or equal to a first change threshold and the second eigenvalue is greater than or equal to the first characteristic threshold. The control module is further configured to determine that the type of the power supply is the power grid if the change information is less than the first change threshold or the second eigenvalue is less than the first characteristic threshold.

[0150] It should be noted that the first characteristic threshold can be used to measure whether the second characteristic value is large. The control module can also be used to compare the change information with the first change threshold, and compare the second characteristic value with the first characteristic threshold. When the change information is greater than or equal to the first change threshold and the second characteristic value is greater than or equal to the first characteristic threshold, it is determined that the power supply type of the power supply is a generator. When the change information is less than the first change threshold, even if the second characteristic value is greater than or equal to the first characteristic threshold, and when the second characteristic value is less than the first characteristic threshold, even if the change information is greater than or equal to the first change threshold, the power supply type is still identified as the power grid. Since when the power supply is a generator, both the change information and the second characteristic value are large. Therefore, when the change information is large (greater than or equal to the first change threshold) and the second characteristic value is small (less than the first characteristic threshold), or the second characteristic value is large (greater than or equal to the first characteristic threshold) and the change information is small (less than the first change threshold), it may be caused by other interference factors that the change information is large or the second characteristic value is large, rather than the power supply being a generator. Therefore, in this embodiment, it is possible to reduce the phenomenon that the power supply type is misidentified as a generator due to interference from other factors when the power supply is from the power grid, thereby improving the accuracy of power supply type identification.

[0151] When using a generator to supply power to the air conditioner, when the motor load is in the stopped state and the running state respectively, the degree of change in the third harmonic distortion of the input voltage provided by the generator is relatively large. At the same time, when the motor load is in the running state, the degree of change in the third harmonic distortion of the input voltage provided by the generator itself is also relatively large. In this embodiment, the control module determines that the power supply type of the power supply is a generator when the change information is greater than or equal to the first change threshold and the second characteristic value is greater than or equal to the characteristic threshold, and determines that the power supply type of the power supply is the power grid when the change information is less than the first change threshold or the second characteristic value is less than the characteristic threshold. It is possible to reduce the phenomenon that the large change in the third harmonic distortion of the input voltage caused by other interference factors or the large third harmonic distortion of the second input voltage caused by other interference factors is misjudged as the power supply type being a generator, thereby improving the accuracy of power supply type identification.

[0152] In this embodiment, the control module is used to jointly determine the power supply type of the power supply according to the change information of the second characteristic value relative to the first characteristic value and the characteristic interval to which the second characteristic value belongs, so as to avoid the phenomenon of misjudging the power supply type of the power supply due to the coincidence of the change information caused by other factors and the change information caused by the power supply type, and improve the identification accuracy of the power supply type.

[0153] Figure 6 Fig. 5 shows a schematic structural diagram of an air conditioner provided by an embodiment of the present application. As Figure 6As shown, the air conditioner may further include a first inductor L1, which is respectively connected to the rectifier circuit 610 and the motor load 620. The motor load 620 is configured to operate based on the voltage signal output by the first inductor L1 and the current signal output by the first inductor L1. The control module 630 is further configured to determine that the power supply type of the power supply 640 is a generator when the second eigenvalue is greater than or equal to the first eigenvalue threshold and the change information is greater than or equal to the first change threshold.

[0154] It should be noted that the first inductor L1 and the rectifier circuit 610 form a passive PFC (Power Factor Correction) circuit. The first inductor L1 is used to increase the conduction angle of the rectifier circuit 610, such as broadening the conduction angle of the rectifier bridge in the rectifier circuit 610, so as to increase the conduction angle of the input current provided by the power supply 640, achieving the purpose of correcting the power factor. Among them, the power factor refers to the ratio of the active current to the apparent current, or the ratio of the active power to the apparent power.

[0155] Among them, the conduction angle of the rectifier circuit 610 may refer to the angle corresponding to the time when the rectifier circuit 610 allows the input current to conduct within an AC cycle. This angle reflects the absorption characteristics of the rectifier circuit 610 for the AC current. The smaller the conduction angle, the more concentrated the current conduction is near the voltage peak, the sharper the waveform, and the more serious the harmonic distortion; the larger the conduction angle, the closer the input current is to the sine wave, which is beneficial to reducing harmonics and improving the power factor.

[0156] It should be noted that by setting the first inductor L1 in the air conditioner, the first inductor L1 is respectively connected to the rectifier circuit 610 and the motor load 620. The current of the first inductor L1 cannot rise or fall instantaneously. Utilizing the inhibitory effect of the first inductor L1 on current changes, the peak current originally concentrated near the AC voltage peak can be smoothly released, thereby expanding the conduction angle of the input current. The passive PFC circuit does not require any semiconductor switching devices and only realizes the optimization and correction of the AC input side current waveform of the rectifier circuit 610 through a network structure composed of passive components such as inductors, making the input current closer to the waveform of the input voltage, thereby effectively reducing harmonic distortion, improving the power factor, and improving the power quality of the system.

[0157] Since the power quality of the power grid is better than that of the generator, therefore, compared with power grid power supply, the change information and the second eigenvalue are relatively large during generator power supply. Therefore, when the second eigenvalue is greater than or equal to the first eigenvalue threshold and the change information is greater than or equal to the first change threshold, determining that the power supply type of the power supply 640 is a generator ensures the accuracy of the determination of the power supply type.

[0158] Please refer to Figure 7, which shows the sixth schematic diagram of the structure of an air conditioner provided by an embodiment of the present application. As Figure 7 shown, the air conditioner may include a rectifier bridge 701, a first inductor L1, a first capacitor C1, an inverter 702, a compressor 703, a voltage detection unit 704, and a controller 705. Among them, the rectifier bridge 701 is respectively connected to the power supply 706 and the first inductor L1, the first inductor L1 is respectively connected to the first capacitor C1 and the inverter 702, the inverter 702 is connected to the compressor 703, the voltage detection unit 704 is connected to the controller 705, the voltage detection unit 704 is coupled to the rectifier bridge 701, and the voltage detection unit 704 can sense the AC voltage received by the rectifier bridge 701, that is, obtain the AC voltage provided by the power supply 706.

[0159] It should be noted that the AC voltage provided by the power supply 706 is rectified by the rectifier bridge 701, then the first inductor L1 is used for freewheeling, and finally the first capacitor C1 is used for voltage filtering to supply electrical energy to the inverter 702 and the compressor 703. Among them, the first inductor L1 is a key device of the passive PFC, which can widen the conduction angle of the input current provided by the power supply 706 to achieve the purpose of correcting the power factor.

[0160] The first inductor and the rectifier circuit form a passive PFC circuit, which improves the power factor, but introduces third-harmonic current. Since the power quality of the generator is relatively poor compared to that of the power grid, in this embodiment, when the second eigenvalue is greater than or equal to the first eigenvalue threshold and the change information is greater than or equal to the first change threshold, it is determined that the power supply type of the power supply is a generator, that is, the power supply with relatively poor dynamic response ability is identified as a generator, improving the accuracy of power supply type identification.

[0161] Figure 8a shows the waveform schematic diagrams of the input voltage and input current provided by the generator when the motor load is in the stopped state, Figure 8b shows the waveform schematic diagrams of the input voltage and input current provided by the generator when the motor load is in the running state, Figure 9a shows the waveform schematic diagrams of the input voltage and input current provided by the power grid when the motor load is in the stopped state, Figure 9b shows the waveform schematic diagrams of the input voltage and input current provided by the power grid when the motor load is in the running state. As Figures 8a to 9b shown, when the air conditioner includes a passive PFC circuit, the change of the second eigenvalue corresponding to the generator power supply relative to the first eigenvalue corresponding to the generator power supply is greater than the change of the second eigenvalue corresponding to the power grid power supply relative to the first eigenvalue corresponding to the power grid power supply.

[0162] Figure 10aIt shows a schematic diagram of the harmonic ratio of the input voltage when the power grid supplies power according to the embodiments of the present application. Figure 10b It shows a schematic diagram of the harmonic ratio of the input voltage when the generator supplies power according to the embodiments of the present application. Among them, the capacity of the generator is 5 kW (kilowatt), and the structure of the air conditioner can be referred to Figure 7 , and the air conditioner includes a passive PFC circuit, and the first frequency is 30 rps (revolutions per second).

[0163] As Figure 10a shown, when the power grid supplies power, when the compressor is in the shutdown state, the difference between the first ratio and the second ratio is small, that is, the third harmonic change is small, and when the compressor runs at 30 rps, the second ratio is also small. As Figure 10b shown, when the generator supplies power, when the compressor is in the shutdown state, the difference between the first ratio and the second ratio is large, that is, the third harmonic change is large, and when the compressor runs at 30 rps, the second ratio is also relatively high. Therefore, it is possible to identify whether the power supply is from the generator or the power grid according to the first ratio and the second ratio.

[0164] In some embodiments, when the compressor enters the shutdown state, obtain the first input voltage for 5 s, perform FFT analysis to obtain the first ratio A, control the compressor to run at 30 rps, obtain the second input voltage for 5 s, perform FFT analysis to obtain the second ratio B. If the second ratio B is greater than or equal to 8%, and the value obtained by dividing the second ratio B by the first ratio A is greater than or equal to 2 and less than 3, then determine that the power supply of the air conditioner is the generator, and control the compressor to operate at a derated 70%; if the second ratio B is greater than or equal to 8%, and the value obtained by dividing the second ratio B by the first ratio A is greater than or equal to 3 and less than 4, then determine that the power supply of the air conditioner is the generator, and control the compressor to operate at a derated 50%; if the second ratio B is greater than or equal to 8%, and the value obtained by dividing the second ratio B by the first ratio A is greater than or equal to 4, then determine that the power supply of the air conditioner is the generator, control the compressor to stop running, and control the indoor fan and / or the outdoor fan to run. Otherwise, determine that the power supply of the air conditioner is the power grid, and control the compressor to operate at 100% power, that is, the second ratio B is less than 8%, or the value obtained by dividing the second ratio B by the first ratio A is less than 2, determine that the power supply of the air conditioner is the power grid, and the operating power of the compressor is less than or equal to the maximum power corresponding to the compressor. Optionally, the compressor can be controlled to operate at the rated power of the compressor.

[0165] In this embodiment, power supply type identification can be achieved, and the wave generating device and the dedicated signal generator can be omitted, avoiding problems such as complex installation and maintenance and the lifespan of hardware. At the same time, based on the value obtained by dividing the second ratio by the first ratio, the power supply type is determined. Based on the fundamental wave amplitude and the third harmonic amplitude before and after the load change of the air conditioner, the power supply type is determined, avoiding the influence of air conditioner startup and shutdown on identification. At the same time, based on the value obtained by dividing the second ratio by the first ratio, that is, based on the power quality of the power supply, hierarchical power control of the compressor is achieved, and the power of the compressor is smoothly controlled to avoid frequent shutdowns.

[0166] Figure 11 FIG. 7 shows a schematic structural diagram of an air conditioner provided by an embodiment of the present application. As Figure 11 shown, the air conditioner 1110 may include a current shaping module 1111, a rectifier circuit 1112, a motor load 1113, and a control module 1114. The current shaping module 1111 is respectively connected to the rectifier circuit 1112, the motor load 1113, and the control module 1114. Among them, the control module 1114 is further configured to control the on / off state of the current shaping module 1111 according to the input voltage and input current provided by the power supply 1120, so as to adjust the input current provided by the power supply 1120 through the current shaping module 1111. The motor load 1113 is configured to operate based on the voltage signal output by the current shaping module 1111 and the current signal output by the current shaping module 1111. The control module 1114 is further configured to analyze the second harmonic of the second input voltage to obtain a third eigenvalue, and determine the power supply type of the power supply 1120 according to the first eigenvalue, the second eigenvalue, and the third eigenvalue.

[0167] It should be noted that the control module 1114 uses the waveform of the input voltage provided by the power supply 1120 as the target current waveform. The control module 1114 dynamically adjusts the on / off state of the current shaping module 1111 by collecting the input voltage and input current provided by the power supply 1120, thereby controlling the current absorption behavior of the motor load 1113 in each voltage cycle, such as adjusting the absorption timing and duration, making the waveform of the input current closer to the sine waveform of the input voltage, and making the input current and the input voltage in phase synchronization, effectively expanding the conduction angle of the input current, reducing the harmonic distortion, maximizing the active power between the input voltage and the input current, and achieving the purpose of power factor correction.

[0168] It is understandable that the current shaping module 1111 may include a switching device. By controlling the on / off state of the switching device, the on / off state of the current shaping module 1111 can be controlled. Among them, the on / off state of the switching device may include an on state and an off state. The current shaping module 1111 may include an active device, and the current shaping module 1111 and the rectifier circuit 1112 form an active PFC circuit.

[0169] It should be noted that the air conditioner 1110 includes a current shaping module 1111, and the current shaping module 1111 can be used to optimize the waveform of the input current and improve the power factor. The control module 1114 can control the on / off state of the current shaping module 1111, so as to adjust the absorption mode of the motor load 1113 for absorbing the input current of the power supply 1120. However, in the actual working process, due to factors such as certain control delay, calculation lag or incomplete sampling in the response of the control module 1114, there is a phase deviation or frequency modulation residual between the conduction control of the current shaping module 1111 and the input voltage waveform, thereby introducing a relatively significant second harmonic component. Since the voltage regulation ability of the generator is weak, compared with the power supply of the air conditioner 1110 by the power grid, when the motor load 1113 is in the operating state, the amplitude of the second harmonic of the input voltage provided by the generator is relatively large. Therefore, the power supply type of the power supply 1120 can be distinguished according to the characteristics of the second harmonic of the second input voltage.

[0170] In some embodiments, the third eigenvalue may include a third amplitude and / or a fourth ratio. Among them, the third amplitude refers to the amplitude corresponding to the second harmonic of the second input voltage, and the fourth ratio may refer to the ratio between the third amplitude and the fundamental amplitude corresponding to the second input voltage. It should be noted that the third eigenvalue includes the third amplitude and / or the fourth ratio, that is, the amplitude corresponding to the second harmonic of the second input voltage, and / or, the ratio between the amplitude of this second harmonic and the fundamental amplitude is used as the third eigenvalue. That is, the third eigenvalue can reflect the distortion degree of the second harmonic of the second input voltage, and the control module 1114 can accurately determine the power supply type of the power supply 1120 based on the first eigenvalue, the second eigenvalue and the third eigenvalue.

[0171] Exemplarily, the fourth ratio may refer to the third amplitude divided by the fundamental amplitude corresponding to the second input voltage.

[0172] Figure 12 The module schematic diagram of a current shaping module provided by an embodiment of the present application is shown. In some embodiments, please refer to Figure 12, the current shaping module may include a second inductor L2, a switching transistor Q1, and a fifth diode D5. Among them, one end of the second inductor L2 is connected to the rectifier circuit 1201, the other end of the second inductor L2 is respectively connected to the first end of the switching transistor Q1 and the anode of the fifth diode D5, the cathode of the fifth diode D5 is connected to the motor load 1202, the second end of the switching transistor Q1 is respectively connected to the rectifier circuit 1201 and the motor load 1202, and the third end of the switching transistor Q1 is connected to the control module 1203. The control module 1203 can control the on-off state of the switching transistor Q1 according to the input voltage and input current provided by the power supply 1204, that is, control the switching transistor Q1 to be in the on state or the off state.

[0173] It should be noted that the AC voltage provided by the power supply is rectified by the rectifier bridge and then freewheels through the second inductor L2. The switching transistor Q1 is an active switch. The control module 1203 controls the on-off state of the switching transistor Q1 according to the input voltage and input current, such as adjusting the duty cycle of the drive signal provided to the switching transistor Q1 to make the input current follow the input voltage waveform. The fifth diode D5 can be used to prevent the current at both ends of the capacitor C1 from flowing reversely to the switching transistor Q1, and finally voltage filtering is performed through the capacitor C1 to supply electrical energy to the motor load 1202. The second inductor L2 and the switching transistor Q1 cooperate with each other to widen the conduction angle of the input current and achieve the purpose of correcting the power factor.

[0174] Optionally, the fifth diode D5 may include but is not limited to FRD (Fast Recovery Diode), Schottky diode, etc.

[0175] Optionally, the switching transistor Q1 is an NMOS (N-Metal-Oxide-Semiconductor) transistor. It should be noted that compared with the PMOS transistor, the NMOS transistor has less loss and lower heat generation when conducting, so the power consumption of the active PFC circuit can be reduced. Optionally, the NMOS transistor is an enhancement-mode NMOS transistor. Among them, the gate of the NMOS transistor is connected to the control module 1203, the source of the NMOS transistor is connected to the output end of the motor load 1202, and the drain of the NMOS transistor is connected to the input end of the motor load 1202. It should be noted that the enhancement-mode device remains in the off state without gate voltage and is only in the on state when a sufficient gate voltage is applied. In this embodiment, the enhancement-mode NMOS transistor is used as the switching device of the active PFC circuit, which is convenient for the design of the drive circuit and avoids the risk of mis-conduction.

[0176] In some embodiments, the control module 1203 may further include a controller, a voltage detection unit, and a drive circuit. The drive circuit is respectively connected to the controller and the switching transistor Q1, and the voltage detection unit is connected to the controller. The controller is further configured to output a control signal to the drive circuit according to the input voltage and input current provided by the power supply 1204. The drive circuit controls the on-off state of the current shaping module according to the control signal. In this embodiment, a drive circuit is provided between the controller and the switching transistor Q1, and the drive circuit can convert the control signal output by the controller into a drive signal with sufficient driving ability to ensure reliable conduction and cutoff of the switching transistor Q1.

[0177] In some embodiments, the control module 1203 is further configured to determine the power supply type of the power supply 1204 according to the change information of the second eigenvalue relative to the first eigenvalue and the second harmonic eigenvalue interval to which the third eigenvalue belongs.

[0178] In some embodiments, the control module 1203 is further configured to determine that the power supply type of the power supply 1204 is a generator if the change information is greater than or equal to the first change threshold and the third eigenvalue is greater than or equal to the second eigenvalue threshold. The control module 1203 is further configured to determine that the power supply type of the power supply 1204 is a power grid if the change information is less than the first change threshold or the third eigenvalue is less than the second eigenvalue threshold.

[0179] It should be noted that the second eigenvalue threshold is used to measure whether the third eigenvalue is large. It can be understood that the second eigenvalue threshold can be obtained through experimental tests. By determining the third eigenvalue when the power grid and the generator supply power to the air conditioner respectively with the motor load 1202 in the operating state, the second eigenvalue threshold can separate the third eigenvalue when the power grid supplies power from the third eigenvalue when the generator supplies power. It can be understood that both the first eigenvalue threshold and the second eigenvalue threshold can be obtained through experimental tests, and the first eigenvalue threshold and the second eigenvalue threshold may be the same or different.

[0180] It can be understood that in the case where the air conditioner uses an active PFC circuit to achieve power factor adjustment, the control module can determine the power supply type of the power supply 1204 according to the change information of the second eigenvalue relative to the first eigenvalue and the second harmonic eigenvalue interval to which the third eigenvalue belongs, or can also determine the power supply type of the power supply 1204 according to the change information of the second eigenvalue relative to the first eigenvalue and the third harmonic eigenvalue interval to which the second eigenvalue belongs.

[0181] In some embodiments, the control module 1203 is further configured to determine the power supply type of the power supply 1204 according to the change information of the second eigenvalue relative to the first eigenvalue, the characteristic interval to which the third eigenvalue belongs, and the characteristic interval to which the second eigenvalue belongs. In this embodiment, determining the power supply type of the power supply 1204 according to the change information, the characteristic interval to which the third eigenvalue belongs, and the characteristic interval to which the second eigenvalue belongs can improve the accuracy of power supply type identification.

[0182] In some embodiments, the control module 1203 is further configured to determine that the power supply type of the power supply is a generator if the change information is greater than or equal to the first change threshold when the second eigenvalue is greater than or equal to the first characteristic threshold or the third eigenvalue is greater than or equal to the second characteristic threshold.

[0183] The air conditioner includes a current shaping module, and the control module can control the on / off state of the current shaping module. Due to reasons such as time delay in the control of the current shaping module by the control module, the amplitude of the second harmonic current generated by the air conditioner is relatively high. In this embodiment, the control module analyzes the second harmonic of the second input voltage to obtain a second eigenvalue that can reflect the amplitude of the second harmonic of the second input voltage. Since the power quality of the generator is relatively poor compared to the power grid, only when the second eigenvalue is greater than or equal to the first characteristic threshold or the third eigenvalue is greater than or equal to the second characteristic threshold and the change information is greater than or equal to the first change threshold, it is determined that the power supply type of the power supply is a generator, which can ensure accurate identification of the situation where power is supplied by a generator.

[0184] Figure 13 FIG. 8 shows a schematic structural diagram of an air conditioner provided by an embodiment of the present application. As Figure 13 shown, the air conditioner may include a rectifier bridge 1301, a second inductor L2, a second capacitor C2, a switching transistor Q1, a fifth diode D5, an inverter 1302, a compressor 1303, a voltage detection unit 1304, a driving circuit 1305, and a controller 1306. Among them, the rectifier bridge 1301 is respectively connected to the power supply 1307 and the second inductor L2. The second inductor L2 is respectively connected to the positive electrode of the fifth diode D5 and the switching transistor Q1. The negative electrode of the fifth diode D5 is respectively connected to the second capacitor C2, the inverter 1302, and the compressor 1303. The voltage detection unit 1304 is coupled to the rectifier bridge 1301. The voltage detection unit 1304 can sense the AC voltage received by the rectifier bridge 1301, that is, obtain the AC voltage provided by the power supply 1307. The controller 1306 is respectively connected to the voltage detection unit 1304 and the driving circuit 1305.

[0185] It should be noted that the AC voltage provided by the power supply 1307 is rectified by the rectifier bridge 1301 and then freewheels through the second inductor L2. The switching transistor Q1 is the active switch, and the controller 1306 controls the on-off state of the switching transistor Q1 according to the input voltage and input current, such as adjusting the duty cycle of the driving signal provided to the switching transistor Q1 to make the input current follow the input voltage. The fifth diode D5 can be used to prevent the current at both ends of the capacitor C1 from flowing reversely to the switching transistor Q1, and finally, voltage filtering is performed through the second capacitor C2 to supply electrical energy to the inverter 1302 and the compressor 1303. The second inductor L2 and the switching transistor Q1 cooperate with each other to widen the conduction angle of the input current provided by the power supply 1307, achieving the purpose of correcting the power factor.

[0186] Figure 14a It shows a schematic waveform diagram of the input voltage and input current provided by the generator when the motor load is in the stop state. Figure 14b It shows a schematic waveform diagram of the input voltage and input current provided by the generator when the motor load is in the running state. Figure 15a It shows a schematic waveform diagram of the input voltage and input current provided by the power grid when the motor load is in the stop state. Figure 15b It shows a schematic waveform diagram of the input voltage and input current provided by the power grid when the motor load is in the running state. As Figures 14a to 15b shown, in the case where the air conditioner includes an active PFC circuit, the voltage regulation ability of the generator is insufficient, resulting in the amplitude of the third harmonic of the input voltage provided by the generator being greater than the amplitude of the third harmonic of the input voltage provided by the power grid. At the same time, when the motor load is in the running state, the amplitude of the second harmonic of the input voltage provided by the generator is also greater than the amplitude of the second harmonic of the input voltage provided by the power grid. Therefore, the control module can determine the power supply type of the power supply with high accuracy according to the first eigenvalue, the second eigenvalue, and the third eigenvalue.

[0187] Figure 16a It shows a schematic diagram of the harmonic proportion of the input voltage when the power grid supplies power according to the embodiment of the present application, and 16b shows a schematic diagram of the harmonic proportion of the input voltage when the generator supplies power according to the embodiment of the present application. Among them, the capacity of the generator is 5 kW (kilowatts), and the structure of the air conditioner can refer to Figure 13 This air conditioner can include an active PFC circuit, and the first frequency is 30 rps (revolutions per second).

[0188] As Figure 16a shown, when the air conditioner is powered by the power grid, when the compressor is in the stop state, the difference between the first ratio and the second ratio is not large, that is, the third harmonic changes little. As Figure 16bAs shown, when the air conditioner is powered by a generator, when the compressor operates at 30 rps, the difference between the first ratio and the second ratio is large, that is, the third harmonic changes greatly. And when the compressor operates at 30 rps, the second ratio and the fourth ratio are also relatively high. Therefore, it is possible to identify whether the power supply is from a generator or the power grid based on the first ratio, the second ratio, and the fourth ratio.

[0189] In some embodiments, when the compressor enters the shutdown state, the first input voltage for 5 s is obtained and subjected to FFT analysis to obtain the first ratio A. The compressor is controlled to operate at 30 rps, the second input voltage for 5 s is obtained and subjected to FFT analysis to obtain the second ratio B and the fourth ratio C. If the second ratio B is greater than or equal to 8% or the fourth ratio C is greater than or equal to 8%, and the value obtained by dividing the second ratio B by the first ratio A is greater than or equal to 2 and less than 3, it is determined that the power supply of the air conditioner is a generator, and the compressor is controlled to operate with a 70% derating; if the second ratio B is greater than or equal to 8% or the fourth ratio C is greater than or equal to 8%, and the value obtained by dividing the second ratio B by the first ratio A is greater than or equal to 3 and less than 4, it is determined that the power supply of the air conditioner is a generator, and the compressor is controlled to operate with a 50% derating; if the second ratio B is greater than or equal to 8% or the fourth ratio C is greater than or equal to 8%, and the value obtained by dividing the second ratio B by the first ratio A is greater than or equal to 4, it is determined that the power supply of the air conditioner is a generator, and the compressor is controlled to stop running, while the indoor fan and / or the outdoor fan runs. Otherwise, it is determined that the power supply of the air conditioner is the power grid, and the compressor is controlled to operate at 100% power, that is, if the second ratio B is less than 8% or the fourth ratio C is less than 8%, or the value obtained by dividing the second ratio B by the first ratio A is less than 2, it is determined that the power supply of the air conditioner is the power grid, and the operating power of the compressor is less than or equal to the maximum power corresponding to the compressor. Optionally, the compressor can be controlled to operate at the rated power of the compressor.

[0190] In this embodiment, the power supply type can be identified. At the same time, the wave generating device and the dedicated signal generator can be omitted, and problems such as complex installation and maintenance and hardware life can be avoided. At the same time, according to the value obtained by dividing the second ratio by the first ratio, the power supply type is determined. Based on the fundamental wave amplitude and the third harmonic amplitude before and after the load change of the air conditioner, the power supply type is determined, which can avoid the influence of air conditioner startup and shutdown on the identification. At the same time, according to the value obtained by dividing the second ratio by the first ratio, that is, according to the quality of the power supply, hierarchical power control of the compressor is realized, and the power of the compressor is smoothly controlled to avoid frequent shutdowns.

[0191] Please refer to Figure 17, which shows a schematic flow chart of an air conditioner control method provided by an embodiment of the present application. This power type identification method can be applied to an air conditioner. As Figure 17 shown, this power type identification method may include step 1702 to step 1710.

[0192] Step 1702, when the motor load is in a stopped state, obtain the first input voltage provided by the power supply.

[0193] Step 1704, analyze the third harmonic of the first input voltage to obtain a first eigenvalue.

[0194] Step 1706, when the motor load is in an operating state, obtain the second input voltage provided by the power supply.

[0195] Step 1708, analyze the third harmonic of the second input voltage to obtain a second eigenvalue.

[0196] Step 1710, calculate the change information of the first eigenvalue relative to the second eigenvalue, and determine the operating power range of the motor load.

[0197] Exemplarily, calculating the change information of the first eigenvalue relative to the second eigenvalue and determining the operating power range of the motor load may include calculating the change information of the first eigenvalue relative to the second eigenvalue and determining the maximum value of the operating power range of the motor load.

[0198] Step 1712, control the operation of the motor load according to the operating power range of the motor load.

[0199] Exemplarily, controlling the operation of the motor load according to the operating power range of the motor load may include controlling the operation of the motor load according to the maximum value of the operating power range of the motor load. It should be noted that the control module can be used to control the operating power of the motor load to be less than or equal to the maximum value of the operating power range.

[0200] It should be noted that the power supply may refer to a power supply device or a power system that provides electrical energy for the air conditioner.

[0201] It can be understood that the control module can analyze the third harmonic of the first input voltage to obtain a first eigenvalue when the first input voltage is obtained, or it can also analyze the third harmonic of the first input voltage to obtain a first eigenvalue, and analyze the third harmonic of the second input voltage to obtain a second eigenvalue when the first input voltage and the second input voltage are obtained. The control module can analyze the third harmonic of the first input voltage and the third harmonic of the second input voltage simultaneously, or it can analyze the third harmonic of the first input voltage and the third harmonic of the second input voltage non-simultaneously. This embodiment does not make any limitations on this, and can be set according to actual needs.

[0202] In some embodiments, the first eigenvalue includes a first amplitude, the second eigenvalue includes a second amplitude, the control module analyzes the third harmonic of the first input voltage to obtain the first amplitude, and analyzes the third harmonic of the second input voltage to obtain the second amplitude.

[0203] In some embodiments, the first eigenvalue includes a first ratio, the second eigenvalue includes a second ratio, the control module analyzes the fundamental wave of the first input voltage to obtain the fundamental wave amplitude corresponding to the first input voltage, calculates the first amplitude divided by the fundamental wave amplitude corresponding to the first input voltage to obtain the first ratio, the control module analyzes the fundamental wave of the second input voltage to obtain the fundamental wave amplitude corresponding to the second input voltage, and calculates the second amplitude divided by the fundamental wave amplitude corresponding to the second input voltage to obtain the second ratio.

[0204] In some embodiments, the control module calculates a third ratio between the second eigenvalue and the first eigenvalue, and / or the control module calculates the difference between the second eigenvalue and the first eigenvalue.

[0205] In some embodiments, the control module divides the second eigenvalue by the first eigenvalue to obtain a third ratio, and / or the control module subtracts the first eigenvalue from the second eigenvalue to obtain the difference between the second eigenvalue and the first eigenvalue.

[0206] In some embodiments, if the control module detects that the change information is greater than or equal to the first change threshold, it determines that the maximum value of the operating power range of the motor load is the rated power of the motor load. If the control module detects that the change information is less than the first change threshold, it determines that the maximum value of the operating power range of the motor load is the maximum power corresponding to the motor load.

[0207] In some embodiments, if the control module detects that the change information is greater than or equal to the first change threshold and less than the second change threshold, it determines that the maximum value of the operating power range of the motor load is the first percentage of the rated power of the motor load. If the control module detects that the change information is greater than or equal to the second change threshold and less than the third change threshold, it determines that the maximum value of the operating power range of the motor load is the second percentage of the rated power of the motor load, where the second percentage is less than the first percentage.

[0208] In some embodiments, the motor load may include a compressor, and the air conditioner may include a fan module. If the control module detects that the change information is greater than or equal to the third change threshold, it controls the compressor to stop operating and controls the fan module to operate.

[0209] In some embodiments, when the power supply type of the power supply is a generator, the control module determines the operating power range of the motor load according to the change interval to which the change information belongs.

[0210] In some embodiments, the air conditioner further includes an inductor, which is used to increase the conduction angle of the rectifier circuit. The motor load operates based on the voltage signal and current signal output by the inductor. The control module determines that the power supply type of the power supply is a generator when the second eigenvalue is greater than or equal to the first feature threshold and the change information is greater than or equal to the first change threshold.

[0211] In some embodiments, the air conditioner further includes a current shaping module, which is respectively connected to the rectifier circuit and the motor load. The motor load operates based on the voltage signal and current signal output by the current shaping module. The control module controls the on-off state of the current shaping module according to the input voltage and input current provided by the power supply, so as to adjust the input current provided by the power supply through the current shaping module. The control module can also analyze the second harmonic of the second input voltage to obtain a third eigenvalue. When the second eigenvalue is greater than or equal to the first feature threshold, or the third eigenvalue is greater than or equal to the second feature threshold, if the change information is greater than or equal to the first change threshold, it is determined that the power supply type of the power supply is a generator.

[0212] In some embodiments, the control module is further configured to control the motor load to operate at a first frequency, and obtain the second input voltage provided by the power supply when the motor load operates at the first frequency. Among them, when the motor load operates at the first frequency, the input current of the motor load is greater than the target current.

[0213] Please refer to Figure 18 , which shows a schematic flow chart of another air conditioner control method provided by an embodiment of the present application. This method can be applied to an air conditioner. In this embodiment, the air conditioner is provided with a passive PFC circuit to achieve power factor correction through the passive PFC circuit.

[0214] As Figure 18 shown, this method may include step 1802 to step 1818.

[0215] Step 1802, continuously detect the input voltage for 5 s each time the compressor stops, and calculate the first ratio A.

[0216] It should be noted that the compressor stopping can refer to the compressor being in a stopped state, or the compressor stopping running. Continuously detecting the input voltage for 5 s when the compressor stops, that is, obtaining the first input voltage, and the duration corresponding to the first input voltage is 5 s.

[0217] Step 1804, continuously detect the input voltage for 5 s each time the compressor runs to 30 rps after starting, and calculate the second ratio B.

[0218] It should be noted that when the compressor switches from the shutdown state to the operating state, its operating frequency gradually increases. When the operating frequency of the compressor reaches 30 rps, the input voltage is continuously detected for 5 s, that is, the second input voltage is obtained, and the duration corresponding to the second input voltage is 5 s.

[0219] Step 1806, determine whether the second ratio B is greater than or equal to 8%, and the second ratio B divided by the first ratio A is greater than or equal to 4. If so, execute Step 1808; if not, execute Step 1810.

[0220] Step 1808, determine that the power supply is a generator, and control the compressor to stop running.

[0221] Step 1810, determine whether the second ratio B is greater than or equal to 8%, and the second ratio B divided by the first ratio A is greater than or equal to 3. If so, execute Step 1812; if not, execute Step 1814.

[0222] Step 1812, determine that the power supply is a generator, and limit the operating power of the compressor to 50% of the rated power.

[0223] It should be noted that if the second ratio B is greater than or equal to 8%, and the second ratio B divided by the first ratio A is greater than or equal to 3 and less than 4, then determine that the power supply is a generator, and the maximum value of the operating power range of the compressor is 50% of the rated power of the compressor.

[0224] Step 1814, determine whether the second ratio B is greater than or equal to 8%, and the second ratio B divided by the first ratio A is greater than or equal to 2. If so, execute Step 1816; if not, execute Step 1818.

[0225] Step 1816, determine that the power supply is a generator, and limit the operating power of the compressor to 70% of the rated power.

[0226] It should be noted that if the second ratio B is greater than or equal to 8%, and the second ratio B divided by the first ratio A is greater than or equal to 2 and less than 3, then determine that the power supply is a generator, and the maximum value of the operating power range of the compressor is 70% of the rated power of the compressor.

[0227] Step 1818, determine that the power supply is the power grid, and the maximum value of the operating power range of the compressor is the maximum power corresponding to the compressor.

[0228] It should be noted that if the second ratio B is less than 8%, or the second ratio B divided by the first ratio A is less than 2, then determine that the power supply is a generator, and the compressor operates at 100% power, that is, the maximum value of the operating power range of the compressor is the maximum power corresponding to the compressor.

[0229] Please refer to Figure 19 , which shows a schematic flow chart of another air conditioner control method provided by an embodiment of the present application. This method can be applied to an air conditioner. In this embodiment, power factor correction is achieved through an active PFC circuit.

[0230] As Figure 19 shown, this method may include step 1902 to step 1918.

[0231] Step 1902, continuously detect the input voltage for 5 s each time the compressor stops, and calculate the first ratio A.

[0232] It should be noted that the compressor stop may refer to the compressor being in a stopped state, or the compressor stops running. When the compressor stops, continuously detect the input voltage for 5 s, that is, obtain the first input voltage, and the duration corresponding to this first input voltage is 5 s.

[0233] Step 1904, each time the compressor starts and runs to 30 rps, control the on / off state of the switch tube Q1, continuously detect the input voltage for 5 s, and calculate the second ratio B.

[0234] It should be noted that when the compressor switches from the stopped state to the running state, its operating frequency gradually increases. When the operating frequency of the compressor reaches 30 rps, the on / off state of the current shaping module can be controlled according to the input voltage and input current provided by the power supply, so as to adjust the input current provided by the power supply through the current shaping module, and continuously detect the input voltage for 5 s, that is, obtain the second input voltage, and the duration corresponding to this second input voltage is 5 s.

[0235] Step 1906, determine whether the second ratio B is greater than or equal to 8% or the fourth ratio C is greater than or equal to 8%, and the second ratio B divided by the first ratio A is greater than or equal to 4. If so, execute step 1908; if not, execute step 1910.

[0236] Step 1908, determine that the power supply is a generator, and control the compressor to stop running.

[0237] Step 1910, determine whether the second ratio B is greater than or equal to 8% or the fourth ratio C is greater than or equal to 8%, and the second ratio B divided by the first ratio A is greater than or equal to 3. If so, execute step 1912; if not, execute step 1914.

[0238] Step 1912, determine that the power supply is a generator, and limit the operating power of the compressor to 50% of the rated power.

[0239] It should be noted that if the second ratio B is greater than or equal to 8% or the fourth ratio C is greater than or equal to 8%, and the second ratio B divided by the first ratio A is greater than or equal to 3 and less than 4, then the power supply is determined to be a generator, and the maximum value of the operating power range of the compressor is 50% of the rated power of the compressor.

[0240] Step 1914, determine whether the second ratio B is greater than or equal to 8% or the fourth ratio C is greater than or equal to 8%, and the second ratio B divided by the first ratio A is greater than or equal to 2. If so, execute step 1616; if not, execute step 1618.

[0241] Step 1916, determine that the power supply is a generator, and the operating power limit of the compressor is 70% of the rated power.

[0242] It should be noted that if the second ratio B is greater than or equal to 8% or the fourth ratio C is greater than or equal to 8%, and the second ratio B divided by the first ratio A is greater than or equal to 2 and less than 3, then the power supply is determined to be a generator, and the maximum value of the operating power range of the compressor is 70% of the rated power of the compressor.

[0243] Step 1918, determine that the power supply is the power grid, and the maximum value of the operating power range of the compressor is the maximum power corresponding to the compressor.

[0244] It should be noted that if the second ratio B is less than 8%, the fourth ratio C is greater than or equal to 8%, or the second ratio B divided by the first ratio A is less than 2, then the power supply is determined to be a generator, and the compressor operates at 100% power, that is, the maximum value of the power range of the compressor can be the maximum power corresponding to the compressor.

[0245] The embodiment of the present application discloses a computer-readable storage medium that stores a computer program. When the computer program is executed by the processor, the processor implements any power type identification method disclosed in the embodiment of the present application.

[0246] The embodiment of the present application discloses a computer program product, including a computer program. When the computer program is executed by the controller, the controller implements any power type identification method disclosed in the embodiment of the present application.

[0247] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, the "in one embodiment" or "in an embodiment" that appears throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to the present application.

[0248] In various embodiments of the present application, it should be understood that the magnitudes of the serial numbers of the above processes do not necessarily mean the inevitable sequence of execution order. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0249] The units described as separate components above may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place, or can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0250] In addition, in each embodiment of the present application, each functional unit can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0251] If the above integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-accessible memory. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions for causing a computer device (which can be a personal computer, a server or a network device, etc., specifically the processor in the computer device) to execute some or all of the steps of the above methods in each embodiment of the present application.

[0252] Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing relevant hardware through a program. This program can be stored in a computer-readable storage medium, which includes read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc memories, magnetic disk memories, tape memories, or any other computer-readable medium capable of carrying or storing data.

[0253] The above has introduced in detail an air conditioner disclosed in the embodiments of the present application. Specific examples are used herein to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. At the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. An air conditioner, characterized in that, Comprising: A rectifier circuit, which is used to connect to a power supply and rectify the AC voltage provided by the power supply to obtain a DC voltage; A motor load, which is connected to the rectifier circuit and is used to operate based on the DC voltage; A control module, which is respectively connected to the rectifier circuit and the motor load. The control module is used to obtain a first input voltage provided by the power supply, analyze the third harmonic of the first input voltage, and obtain a first eigenvalue when the motor load is in a stopped state; When the motor load is in an operating state, obtain a second input voltage provided by the power supply, analyze the third harmonic of the second input voltage, and obtain a second eigenvalue; Calculate the change information of the second eigenvalue relative to the first eigenvalue, determine the operating power range of the motor load according to the change interval to which the change information belongs; and is used to control the operation of the motor load according to the operating power range of the motor load.

2. The air conditioner according to claim 1, characterized in that, The first eigenvalue includes a first amplitude corresponding to the third harmonic of the first input voltage, and the second eigenvalue includes a second amplitude corresponding to the third harmonic of the second input voltage; and / or The first eigenvalue includes a first ratio between the first amplitude and the fundamental amplitude corresponding to the first input voltage, and the second eigenvalue includes a second ratio between the second amplitude and the fundamental amplitude corresponding to the second input voltage.

3. The air conditioner according to claim 1 or 2, characterized in that, The change information includes a third ratio between the second eigenvalue and the first eigenvalue, and / or, the difference between the second eigenvalue and the first eigenvalue.

4. The air conditioner according to claim 3, wherein The control module is further used to determine that the maximum value of the operating power range of the motor load is less than the rated power of the motor load if the change information is greater than or equal to a first change threshold; The control module is further used to determine that the maximum value of the operating power range of the motor load is the maximum power corresponding to the motor load if the change information is less than the first change threshold.

5. The air conditioner according to claim 4, wherein The control module is further used to determine that the maximum value of the operating power range of the motor load is a first percentage of the rated power of the motor load if the change information is greater than or equal to the first change threshold and less than a second change threshold; The control module is further used to determine that the maximum value of the operating power range of the motor load is a second percentage of the rated power of the motor load if the change information is greater than or equal to the second change threshold and less than a third change threshold; the second percentage is less than the first percentage.

6. The air conditioner according to claim 1, characterized in that The motor load includes a compressor, and the air conditioner further includes a fan module; The control module is further used to control the compressor to stop operating and control the fan module to operate if the change information is greater than or equal to a third change threshold.

7. The air conditioner according to claim 1, characterized in that, The control module is further used to determine the operating power range of the motor load according to the change interval to which the change information belongs when the power type of the power supply is a generator.

8. The air conditioner according to claim 7, characterized in that, The air conditioner further includes an inductor, and the inductor is respectively connected to the rectifier circuit and the motor load; The inductor is configured to increase the conduction angle of the rectifier circuit; The motor load is further configured to operate based on the voltage signal and the current signal output by the inductor; The control module is further configured to determine that the power supply type of the power supply is a generator when the second eigenvalue is greater than or equal to the first feature threshold and the change information is greater than or equal to the first change threshold.

9. The air conditioner according to claim 7, wherein, The air conditioner further includes a current shaping module, and the current shaping module is respectively connected to the rectifier circuit, the motor load, and the control module; The control module is further configured to control the on / off state of the current shaping module according to the input voltage and the input current provided by the power supply, so as to adjust the input current provided by the power supply through the current shaping module; The motor load is further configured to operate based on the voltage signal and the current signal output by the current shaping module; The control module is further configured to analyze the second harmonic of the second input voltage to obtain a third eigenvalue; And when the second eigenvalue is greater than or equal to the first feature threshold, or the third eigenvalue is greater than or equal to the second feature threshold, if the change information is greater than or equal to the first change threshold, it is determined that the power supply type of the power supply is a generator.

10. The air conditioner according to claim 1, characterized in that, The control module is further configured to control the motor load to operate at a first frequency, and obtain the second input voltage provided by the power supply when the motor load operates at the first frequency, wherein when the motor load operates at the first frequency, the input current of the motor load is greater than the target current.

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