Air conditioner

Abstract

The present invention discloses an air conditioner, comprising: a housing; an outdoor heat exchanger installed in the housing for exchanging heat with outdoor air; a compressor installed in the housing and connected to the outdoor heat exchanger for compressing the refrigerant in a high-temperature and high-pressure state and discharging the compressed refrigerant; an outdoor main board, the outdoor main board being respectively connected to the outdoor heat exchanger and the compressor; the outdoor main board is configured to obtain the voltage of the outdoor main board as an initial voltage before the compressor starts, obtain the voltage of the outdoor main board as a real-time voltage after the compressor starts, and determine whether the power supply circuit of the air conditioner is faulty according to the initial voltage and the real-time voltage. The air conditioner according to the embodiment of the present invention can self-detect power current faults, effectively avoid damage to the air conditioner and has higher safety.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and more particularly to an air conditioner. Background Art

[0002] In the related art, when the power supply circuit of an air conditioner is damaged, it is likely to cause a significant decline in the cooling and heating capabilities of the air conditioner, the air conditioner to shut down, and even a risk of the power cord of the power supply circuit catching fire, affecting the user experience and having low safety. Moreover, the aging and damage of the power supply circuit are not easily detected. Therefore, after the air conditioner has been used for a period of time, the air conditioner needs to be turned off and inspected by a maintenance personnel to determine whether the power supply circuit has aged or been abnormally damaged. The detection method is inconvenient and affects the normal use of the air conditioner, resulting in a poor user experience. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, an object of the present invention is to provide an air conditioner that can self-detect power supply current faults, effectively avoid damage to the air conditioner, and has higher safety.

[0004] To achieve the above object, according to an embodiment of the present invention, there is provided an air conditioner, including: a housing; an outdoor heat exchanger installed in the housing for exchanging heat with outdoor air; a compressor installed in the housing and connected to the outdoor heat exchanger for compressing refrigerant in a high-temperature and high-pressure state and discharging the compressed refrigerant; an outdoor main board, the outdoor main board being respectively connected to the outdoor heat exchanger and the compressor; the outdoor main board is configured to obtain the voltage of the outdoor main board as an initial voltage before the compressor starts, and obtain the voltage of the outdoor main board as a real-time voltage after the compressor starts, and determine whether the power supply circuit of the air conditioner is faulty according to the initial voltage and the real-time voltage.

[0005] The air conditioner according to the embodiment of the present invention can self-detect power supply current faults, effectively avoid damage to the air conditioner, and has higher safety.

[0006] According to some embodiments of the present invention, obtaining the voltage of the outdoor main board as an initial voltage before the compressor starts includes: before the compressor starts, the outdoor main board samples and filters the voltage of the outdoor main board, and uses the filtered sampling result as the initial voltage; obtaining the voltage of the outdoor main board as a real-time voltage after the compressor starts includes: after the compressor starts, the outdoor main board samples and filters the voltage of the outdoor main board, and uses the filtered sampling result as the real-time voltage.

[0007] According to some embodiments of the present invention, the outdoor unit main board samples and filters the voltage of the outdoor unit main board, including: sampling the voltage of the outdoor unit main board before the compressor starts multiple times, calculating the first trimmed mean based on the multiple voltage values of the outdoor unit main board, and using the first trimmed mean as the initial voltage; the outdoor unit main board samples and filters the voltage of the outdoor unit main board, including: sampling the voltage of the outdoor unit main board after the compressor starts multiple times, calculating the second trimmed mean based on the multiple voltage values of the outdoor unit main board, and using the second trimmed mean as the real-time voltage.

[0008] According to some embodiments of the present invention, judging whether the power supply circuit of the air conditioner is faulty based on the initial voltage and the real-time voltage includes: judging whether the power supply circuit of the air conditioner is faulty according to the difference between the initial voltage and the real-time voltage.

[0009] According to some embodiments of the present invention, judging whether the power supply circuit of the air conditioner is faulty according to the difference between the initial voltage and the real-time voltage includes: when the following conditions are met, a primary fault signal of the power supply circuit is fed back; the initial voltage is within a preset voltage range; the difference between the initial voltage and the real-time voltage is not less than a first preset difference; wherein, the first preset difference is calculated based on the initial voltage, and the first preset difference is positively correlated with the initial voltage.

[0010] According to some embodiments of the present invention, judging whether the power supply circuit of the air conditioner is faulty according to the difference between the initial voltage and the real-time voltage further includes: when the following conditions are met, a secondary fault signal of the power supply circuit is fed back; the initial voltage is within a preset voltage range; the difference between the initial voltage and the real-time voltage is not less than a second preset difference; wherein, the second preset difference is calculated based on the initial voltage, and the second preset difference is positively correlated with the initial voltage; when the initial voltage is the same, the second preset difference is greater than the first preset difference.

[0011] According to some embodiments of the present invention, after the primary fault signal of the power supply circuit is fed back, it includes: the display screen of the air conditioner displays a warning sign; the air conditioner emits a warning sound; the operating frequency of the compressor is reduced.

[0012] According to some embodiments of the present invention, when the initial voltage is the same, the ratio of the first preset difference to the second preset difference is A; reducing the operating frequency of the compressor includes: reducing the operating frequency of the compressor to the current operating frequency * A.

[0013] According to some embodiments of the present invention, after the feedback power supply circuit has a secondary fault signal, it includes: the display screen of the air conditioner displays a shutdown flag; the air conditioner emits a fault sound; the compressor shuts down.

[0014] According to some embodiments of the present invention, the lower boundary value of the preset voltage range is 130V - 170V; the upper boundary value of the preset voltage range is 198V - 242V.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a flowchart of an air conditioner according to an embodiment of the present invention.

[0018] Figure 2 is a flowchart of an air conditioner according to an embodiment of the present invention for determining whether the power supply circuit of the air conditioner is faulty.

[0019] Figure 3 is a flowchart of an air conditioner according to an embodiment of the present invention for filtering the voltage sampling of the outdoor unit main board before the compressor starts.

[0020] Figure 4 is a flowchart of an air conditioner according to an embodiment of the present invention for filtering the voltage sampling of the outdoor unit main board after the compressor starts.

[0021] Figure 5 is another flowchart of an air conditioner according to an embodiment of the present invention for filtering the voltage sampling of the outdoor unit main board before the compressor starts.

[0022] Figure 6 is another flowchart of an air conditioner according to an embodiment of the present invention for filtering the voltage sampling of the outdoor unit main board after the compressor starts.

[0023] Figure 7 is a flowchart of an air conditioner according to an embodiment of the present invention for determining whether to feedback a primary fault signal of the power supply circuit.

[0024] Figure 8 is a flowchart of an air conditioner according to an embodiment of the present invention for determining whether to feedback a secondary fault signal of the power supply circuit.

[0025] Figure 9 is a flowchart of an air conditioner according to an embodiment of the present invention for feeding back a primary fault signal of the power supply circuit.

[0026] Figure 10 It is a flowchart for reducing the operating frequency of the compressor of an air conditioner according to an embodiment of the present invention.

[0027] Figure 11 It is a flowchart for feeding back a secondary fault signal of the power supply circuit of an air conditioner according to an embodiment of the present invention.

[0028] Figure 12 It is a line graph of the difference between the initial voltage and the real-time voltage of an air conditioner and the initial voltage according to an embodiment of the present invention. Detailed implementation manners

[0029] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. <�

[0031] In the description of the present invention, "the first feature" and "the second feature" may include one or more of such features.

[0032] In the description of the present invention, "a plurality" means two or more, and "several" means one or more.

[0033] An air conditioner according to an embodiment of the present invention will be described below with reference to the drawings.

[0034] As Figures 1 - 12 shown, an air conditioner according to an embodiment of the present invention includes a housing, an outdoor heat exchanger, a compressor, and an outdoor unit main board.

[0035] The outdoor heat exchanger is installed in the housing and is used for heat exchange with outdoor air. The compressor is installed in the housing and is connected to the outdoor heat exchanger, and is used for compressing the refrigerant in a high-temperature and high-pressure state and discharging the compressed refrigerant. The outdoor unit main board is respectively connected to the outdoor heat exchanger and the compressor.

[0036] The outdoor main board is configured to obtain the voltage of the outdoor main board as the initial voltage before the compressor starts, obtain the voltage of the outdoor main board as the real-time voltage after the compressor starts, and determine whether the power supply circuit of the air conditioner is faulty according to the initial voltage and the real-time voltage.

[0037] Among them, the power supply circuit fault can be a power cord fault or a transformer fault. For example, the power cord or the transformer ages, or external impact causes the insulation of the power cord to be damaged or the transformer to be damaged, and then a fault occurs, resulting in abnormal voltage of the air conditioner.

[0038] According to the air conditioner of the embodiment of the present invention, the outdoor heat exchanger is installed in the housing for heat exchange with outdoor air, the compressor is installed in the housing and connected to the outdoor heat exchanger for compressing the refrigerant in a high-temperature and high-pressure state and discharging the compressed refrigerant, and the outdoor main board is respectively connected to the outdoor heat exchanger and the compressor. In this way, the outdoor main board can output a control signal to control the operation of the compressor and the heat exchanger.

[0039] And, the outdoor main board is configured to, as Figure 2 shown, obtain the voltage of the outdoor main board as the initial voltage before the compressor starts, obtain the voltage of the outdoor main board as the real-time voltage after the compressor starts, and determine whether the power supply circuit of the air conditioner is faulty according to the initial voltage and the real-time voltage.

[0040] It can be understood that if the power supply circuit fails, the voltage of the outdoor main board will be abnormal. By comparing whether there is an abnormality in the voltage change of the outdoor main board before and after the compressor starts, it can be determined whether the power supply circuit of the air conditioner is faulty. For example, if the power cord of the power supply circuit ages, the power cord may come into contact with external conductive objects, resulting in a part of the voltage of the outdoor main board flowing to the outside, so that the voltage of the outdoor main board after the compressor starts will be greatly reduced relative to the initial voltage, and then it can be judged that the power supply circuit of the air conditioner is abnormal according to the abnormality of the real-time voltage.

[0041] Thus, the air conditioner can perform self-check according to the voltage of the outdoor main board to accurately judge that the power supply circuit fails. When the power supply circuit ages, it can timely remind the user, with higher use safety, effectively avoid damage to the air conditioner, and the user does not need to regularly stop the air conditioner for detection during normal use, the detection is more convenient, and the user can invite a maintenance personnel for repair after the air conditioner self-checks that the power supply circuit fails, and the user experience is better.

[0042] In this way, the air conditioner according to the embodiment of the present invention can self-check the power supply current fault, effectively avoid damage to the air conditioner and has higher safety.

[0043] In some specific embodiments of the present invention, as Figure 3As shown, before the compressor starts, the voltage of the outdoor unit main board is obtained as the initial voltage, including: before the compressor starts, the outdoor unit main board samples and filters the voltage of the outdoor unit main board, and uses the filtered sampling result as the initial voltage.

[0044] As Figure 4 shown, after the compressor starts, the voltage of the outdoor unit main board is obtained as the real-time voltage, including: after the compressor starts, the outdoor unit main board samples and filters the voltage of the outdoor unit main board, and uses the filtered sampling result as the real-time voltage.

[0045] That is to say, before and after the compressor starts, the detection of the voltage of the outdoor unit main board will be filtered, which can reduce the sampling interference of the voltage, make the sampling of the initial voltage and the real-time voltage of the air conditioner more accurate, is conducive to reducing the sampling error of the initial voltage and the real-time voltage, thereby reducing the misjudgment probability of whether the power supply circuit is faulty, and further improving the use safety of the air conditioner.

[0046] Furthermore, as Figure 5 shown, the outdoor unit main board samples and filters the voltage of the outdoor unit main board, including: sampling the voltage of the outdoor unit main board before the compressor starts multiple times, calculating the first trimmed mean according to the multiple voltage values of the outdoor unit main board, and using the first trimmed mean as the initial voltage.

[0047] The outdoor unit main board samples and filters the voltage of the outdoor unit main board, including: sampling the voltage of the outdoor unit main board after the compressor starts multiple times, calculating the second trimmed mean according to the multiple voltage values of the outdoor unit main board, and using the second trimmed mean as the real-time voltage.

[0048] Among them, using the first trimmed mean as the initial voltage means removing the maximum and minimum values from the voltages of the outdoor unit main board sampled multiple times before the compressor starts, and then obtaining the average value as the initial voltage. Using the second trimmed mean as the real-time voltage means removing the maximum and minimum values from the voltages of the outdoor unit main board sampled multiple times after the compressor starts, and then obtaining the average value as the real-time voltage.

[0049] This can reduce the sampling interference of the initial voltage and the real-time voltage, further improve the accuracy of sampling the initial voltage and the real-time voltage, so that it can more accurately judge whether the power supply circuit is faulty according to the initial voltage and the real-time voltage, and is conducive to reducing the misjudgment probability.

[0050] In some specific embodiments of the present invention, as Figure 6 shown, judging whether the power supply circuit of the air conditioner is faulty according to the initial voltage and the real-time voltage includes: judging whether the power supply circuit of the air conditioner is faulty according to the difference between the initial voltage and the real-time voltage.

[0051] It can be understood that the voltage of the outdoor unit main board measured before the compressor starts is used as the initial voltage. Due to the impedance in the circuit, the voltage of the outdoor unit main board measured after the compressor starts will decrease. If there is a fault in the power supply circuit, such as the power cord aging and the power cord leaking electricity to the outside, the measured real-time voltage will drop significantly. That is to say, when the difference between the initial voltage and the real-time voltage is too large, it means that there is a fault in the power supply circuit, so that the power supply circuit fault can be accurately judged and processed in time.

[0052] In some specific embodiments of the present invention, as Figure 7 shown, judging whether there is a fault in the power supply circuit of the air conditioner according to the difference between the initial voltage and the real-time voltage includes: when the following conditions are met, a primary fault signal of the power supply circuit is fed back.

[0053] The initial voltage is within the preset voltage range;

[0054] The difference between the initial voltage and the real-time voltage is not less than the first preset difference.

[0055] Wherein, the first preset difference is calculated according to the initial voltage, and the first preset difference is positively correlated with the initial voltage.

[0056] For example, the preset voltage range can be 160V to 220V, and the lower boundary value of the preset voltage range can be 130V to 170V, and the upper boundary value of the preset voltage range can be 198V to 242V.

[0057] It can be understood that if the initial voltage is lower than the preset voltage range, that is, the voltage of the outdoor unit main board before the compressor starts is lower than the preset voltage range, it means that the supply voltage is too small. If the initial voltage is higher than the preset voltage range, it means that the supply voltage is too large. And when the initial voltage is within the preset voltage range, it means that the supply voltage is within a normal range, and the air conditioner can be in a normal working state. At this time, judging whether there is a fault in the power supply circuit through the difference between the initial voltage and the real-time voltage can avoid the probability of misjudgment caused by abnormal supply voltage, and further improve the accuracy of judging the power supply circuit fault.

[0058] Moreover, the difference between the initial voltage and the real-time voltage is not less than a first preset difference, that is, the voltage difference of the outdoor unit main board before the compressor starts and after the compressor starts is not less than the first preset difference. Among them, the first preset difference is calculated according to the initial voltage, and the first preset difference is positively correlated with the voltage of the outdoor unit main board before the compressor starts. That is to say, when the initial voltage is larger, the first preset difference is larger, and the specific value of the first preset difference can be calculated according to the initial voltage. In this way, when the difference between the initial voltage and the real-time voltage is less than the first preset difference, it indicates that the voltage drop of the air conditioner is normal and the power supply circuit is not abnormal. If the difference between the initial voltage and the real-time voltage reaches the first preset difference, it indicates that the voltage drop of the air conditioner is too high. Furthermore, it can be judged that there is an abnormality in the power supply circuit. At this time, a primary fault signal of the power supply circuit is fed back so that the air conditioner can take protection measures in time and remind the user to perform maintenance, with higher safety.

[0059] In some specific embodiments of the present invention, such as Figure 8 shown, judging whether the power supply circuit of the air conditioner is faulty according to the difference between the initial voltage and the real-time voltage further includes: when the following conditions are met, a secondary fault signal of the power supply circuit is fed back.

[0060] The initial voltage is within a preset voltage range;

[0061] The difference between the initial voltage and the real-time voltage is not less than a second preset difference.

[0062] Among them, the second preset difference is calculated according to the initial voltage, and the second preset difference is positively correlated with the initial voltage; when the initial voltage is the same, the second preset difference is greater than the first preset difference.

[0063] For example, the preset voltage range can be 160V - 220V, and the lower boundary value of the preset voltage range can be 130V - 170V, and the upper boundary value of the preset voltage range can be 198V - 242V.

[0064] It can be understood that if the initial voltage is lower than the preset voltage range, that is, the voltage of the outdoor unit main board before the compressor starts is lower than the preset voltage range, it indicates that the supply voltage is too small. If the initial voltage is higher than the preset voltage range, it indicates that the supply voltage is too large. And when the initial voltage is within the preset voltage range, it indicates that the supply voltage is within a normal range, and the air conditioner can be in a normal working state. At this time, judging whether the power supply circuit is faulty through the difference between the initial voltage and the real-time voltage can avoid the probability of misjudgment caused by abnormal supply voltage and further improve the accuracy of judging the power supply circuit fault.

[0065] Moreover, the difference between the initial voltage and the real-time voltage is not less than a second preset difference, that is, the difference between the voltage of the outdoor unit main board before the compressor starts and the voltage of the outdoor unit main board after the compressor starts is not less than the second preset difference. Among them, the second preset difference is calculated based on the initial voltage, and the second preset difference is positively correlated with the voltage of the outdoor unit main board before the compressor starts. That is to say, when the initial voltage is larger, the second preset difference is larger, and the specific value of the second preset difference can be calculated based on the initial voltage. In this way, when the difference between the initial voltage and the real-time voltage is less than the second preset difference, it indicates that the voltage drop of the air conditioner is normal and there is no abnormality in the power supply circuit. If the difference between the initial voltage and the real-time voltage reaches the second preset difference, it indicates that the voltage drop of the air conditioner is too high. Furthermore, it can be judged that there is an abnormality in the power supply circuit. At this time, a secondary fault signal of the power supply circuit is fed back so that the air conditioner can take protection measures in time and remind the user to perform maintenance, with higher safety.

[0066] Moreover, the second preset difference is greater than the first preset difference. That is to say, when the initial voltages are the same, the second preset difference can be greater than the first preset difference. In this way, the secondary fault signal of the power supply circuit and the primary fault of the power supply circuit fed back by the air conditioner can be different. For example, the severity of the secondary fault of the power supply circuit can be greater than that of the primary fault of the power supply circuit. The air conditioner can take different countermeasures based on the secondary fault signal of the power supply circuit and the primary fault of the power supply circuit, which can not only ensure the use safety of the air conditioner but also minimize the delay of the user's use of the air conditioner. For example, when the difference between the initial power supply and the real-time power supply just reaches the first preset difference, it indicates that the voltage drop of the outdoor unit main board is abnormal but the fault degree of the power supply circuit is relatively low. It may be that the power cord is tending to age, but it does not affect the use at present. Therefore, corresponding work can be done, which can not only remind the user to check but also keep the air conditioner running. When the difference between the initial power supply and the real-time power supply reaches the second preset difference, it indicates that the fault degree of the power supply circuit is relatively high. At this time, the electrical safety can be given priority consideration. For example, the compressor can be directly stopped to make the air conditioner stop working, thus avoiding risks such as electric leakage.

[0067] In addition, it should be noted that the first preset difference is positively correlated with the initial voltage, and the second preset difference is positively correlated with the initial voltage. Among them, the coefficient of the positive correlation between the first preset difference and the initial voltage and the coefficient of the positive correlation between the second preset difference and the initial voltage can be the same or different.

[0068] In addition, as Figure 12 shown, when the power of the air conditioner is different, the difference between the initial voltage and the real-time voltage is also different. For example, for air conditioners with relatively small power (1 HP to 2 HP), when the initial voltage is at the lower boundary of the preset voltage range, the first preset difference (such as Figure 12 ΔV1 inFigure 12 The ΔV2 in Figure 12 can be 30V - 35V. When the initial voltage is at the upper boundary of the preset voltage range, the first preset difference (such as ΔV3 in Figure 12 ) can be 20V - 25V, and the second preset difference (such as ΔV4 in

[0069]

[0070] Figure 9 In some specific embodiments of the present invention, as shown in Figure 9 After the feedback power supply circuit gives a first-level fault signal, it includes: the display screen of the air conditioner displays a warning sign, the air conditioner emits a warning sound, and the operating frequency of the compressor is reduced.

[0071] In this way, after the feedback power supply circuit gives a first-level fault signal, the user can learn that there is a minor fault in the power supply circuit of the air conditioner according to the warning sign on the display screen or according to the warning sound, so that the air conditioner can be repaired in time. And reducing the operating frequency of the compressor can ensure that the air conditioner is in an operating state, and avoid further damage to the power supply circuit caused by too high an operating frequency of the compressor, which is beneficial to improving the use safety of the air conditioner.

[0072] In some specific embodiments of the present invention, as shown in Figure 10 When the initial voltages are the same, the ratio of the first preset difference to the second preset difference is A. Reducing the operating frequency of the compressor includes: reducing the operating frequency of the compressor to the current operating frequency * A. In this way, when the feedback power supply circuit has a first-level fault, the operating frequency of the compressor can be reduced to the current operating frequency * A, which can not only ensure the normal operation of the air conditioner, but also avoid further damage to the power supply circuit caused by too high an operating frequency of the compressor. The air conditioner has higher use safety and better user experience.

[0073] In some specific embodiments of the present invention, as shown in Figure 11 After the feedback power supply circuit gives a second-level fault signal, it includes: the display screen of the air conditioner displays a shutdown sign, the air conditioner emits a fault sound, and the compressor shuts down.

[0074] In this way, after the secondary fault signal of the feedback power supply circuit is sent, the user can learn that there is a severe fault in the power supply circuit of the air conditioner according to the shutdown sign on the display screen or according to the fault sound, so that the air conditioner can be repaired in time, and the compressor is directly shut down, and the air conditioner stops running, avoiding risks such as electric leakage or fire in the power supply circuit, and further improving the use safety of the air conditioner.

[0075] It should be noted that the shutdown sign displayed on the display screen is different from the warning sign displayed on the display screen, and the warning sound and the fault sound emitted by the air conditioner can be the same or different.

[0076] For example, the shutdown sign displayed on the display screen is different from the warning sign displayed on the display screen, and the warning sound and the fault sound emitted by the air conditioner are different. In this way, the user can judge the fault level of the power supply circuit according to at least one of the sign displayed on the display screen or the sound emitted by the air conditioner, that is, the user can judge the fault level of the power supply circuit together according to both the sign displayed on the display screen and the sound emitted by the air conditioner, or the user can judge the fault level of the power supply circuit according to one of the sign displayed on the display screen and the sound emitted by the air conditioner, so that it is more convenient for the user to judge.

[0077] Or, the shutdown sign displayed on the display screen is different from the warning sign displayed on the display screen, and the warning sound and the fault sound emitted by the air conditioner are the same. In this way, after hearing the sound emitted by the air conditioner, the user can judge the fault level of the power supply circuit by observing the sign displayed on the display screen, that is, the sound emitted by the air conditioner only plays a prompting role to remind the user to check the display screen and judge the fault level of the power supply circuit through the sign displayed on the display screen.

[0078] The other components and operations of the air conditioner according to the embodiments of the present invention are known to those of ordinary skill in the art, and will not be described in detail here.

[0079] The air conditioner in this application performs the refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes, involving compression, condensation, expansion and evaporation, and supplying refrigerant to the air that has been conditioned and heat-exchanged.

[0080] The compressor compresses the refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0081] The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by performing a heat exchange with the material to be cooled by utilizing the latent heat of evaporation of the refrigerant. Throughout the cycle, the air conditioner can adjust the temperature and humidity of the indoor space.

[0082] In the description of this specification, the description referring to terms such as "specific embodiment", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expression of the above terms does not necessarily refer to the same embodiment or example.

[0083] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and purposes of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that, Comprising: A housing; An outdoor heat exchanger, installed in the housing, for exchanging heat with outdoor air; A compressor, installed in the housing and connected to the outdoor heat exchanger, for compressing the refrigerant in a high-temperature and high-pressure state and discharging the compressed refrigerant; An outdoor main board, which is respectively connected to the outdoor heat exchanger and the compressor; The outdoor main board is configured to obtain the voltage of the outdoor main board as the initial voltage before the compressor starts, and obtain the voltage of the outdoor main board as the real-time voltage after the compressor starts, and judge whether the power supply circuit of the air conditioner is faulty according to the initial voltage and the real-time voltage.

2. The air conditioner according to claim 1, wherein Obtaining the voltage of the outdoor main board as the initial voltage before the compressor starts includes: before the compressor starts, the outdoor main board samples and filters the voltage of the outdoor main board, and takes the filtered sampling result as the initial voltage; Obtaining the voltage of the outdoor main board as the real-time voltage after the compressor starts includes: after the compressor starts, the outdoor main board samples and filters the voltage of the outdoor main board, and takes the filtered sampling result as the real-time voltage.

3. The air conditioner according to claim 2, characterized in that, The outdoor main board samples and filters the voltage of the outdoor main board, including: sampling the voltage of the outdoor main board before the compressor starts multiple times, calculating the first trimmed mean according to the multiple voltage values of the outdoor main board, and taking the first trimmed mean as the initial voltage; The outdoor main board samples and filters the voltage of the outdoor main board, including: sampling the voltage of the outdoor main board after the compressor starts multiple times, calculating the second trimmed mean according to the multiple voltage values of the outdoor main board, and taking the second trimmed mean as the real-time voltage.

4. The air conditioner according to claim 1, characterized in that, Judging whether the power supply circuit of the air conditioner is faulty according to the initial voltage and the real-time voltage includes: Judging whether the power supply circuit of the air conditioner is faulty according to the difference between the initial voltage and the real-time voltage.

5. The air conditioner according to claim 4, characterized in that, Judging whether the power supply circuit of the air conditioner is faulty according to the difference between the initial voltage and the real-time voltage includes: When the following conditions are met, a primary fault signal of the power supply circuit is fed back; The initial voltage is within a preset voltage range; The difference between the initial voltage and the real-time voltage is not less than a first preset difference; Wherein, the first preset difference is calculated according to the initial voltage, and the first preset difference is positively correlated with the initial voltage.

6. The air conditioner according to claim 5, characterized in that, Judging whether the power supply circuit of the air conditioner is faulty according to the difference between the initial voltage and the real-time voltage further includes: When the following conditions are met, a secondary fault signal of the power supply circuit is fed back; The initial voltage is within a preset voltage range; The difference between the initial voltage and the real-time voltage is not less than a second preset difference; Wherein, the second preset difference is calculated according to the initial voltage, and the second preset difference is positively correlated with the initial voltage; When the initial voltages are the same, the second preset difference is greater than the first preset difference.

7. The air conditioner according to claim 6, characterized in that After the primary fault signal of the power supply circuit is fed back, it includes: A warning sign is displayed on the display screen of the air conditioner; The air conditioner emits a warning sound; Reduce the operating frequency of the compressor.

8. The air conditioner according to claim 7, wherein, When the initial voltages are the same, the ratio of the first preset difference to the second preset difference is A; Reducing the operating frequency of the compressor includes: Reducing the operating frequency of the compressor to the current operating frequency * A.

9. The air conditioner according to claim 6, wherein After the feedback power supply circuit gives a secondary fault signal, it includes: The display screen of the air conditioner displays a shutdown sign; The air conditioner emits a fault sound; The compressor shuts down.

10. The air conditioner according to claim 5, characterized in that, The lower boundary value of the preset voltage range is 130V - 170V; The upper boundary value of the preset voltage range is 198V - 242V.

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